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authorGravatar Jarred Sumner <jarred@jarredsumner.com> 2021-05-02 13:04:55 -0700
committerGravatar Jarred Sumner <jarred@jarredsumner.com> 2021-05-02 13:04:55 -0700
commit97cb54de2e2990f4ba41f7b68c2b5113e40f2c2e (patch)
tree4e8a040d1e33b9f34bad52cfc2d5f58cdda60cb2 /src
parent3050d5a1a4def6fe90b62854e2252e308f5f708a (diff)
downloadbun-97cb54de2e2990f4ba41f7b68c2b5113e40f2c2e.tar.gz
bun-97cb54de2e2990f4ba41f7b68c2b5113e40f2c2e.tar.zst
bun-97cb54de2e2990f4ba41f7b68c2b5113e40f2c2e.zip
classes work, excluding name and constructor/super
Former-commit-id: 818d0149312b07191340427e5b2990ae6d0cec94
Diffstat (limited to 'src')
-rw-r--r--src/defines.zig2
-rw-r--r--src/js_ast.zig4
-rw-r--r--src/js_lexer.zig1
-rw-r--r--src/js_lexer_tables.zig1
-rw-r--r--src/js_parser.zig10331
-rw-r--r--src/js_parser/imports.zig40
-rw-r--r--src/js_parser/js_parser.zig10245
-rw-r--r--src/js_parser/js_parser_test.zig499
-rw-r--r--src/js_printer.zig16
-rw-r--r--src/main.zig1
10 files changed, 10801 insertions, 10339 deletions
diff --git a/src/defines.zig b/src/defines.zig
index 740d0d80e..1a9023354 100644
--- a/src/defines.zig
+++ b/src/defines.zig
@@ -231,7 +231,7 @@ pub const Define = struct {
// "NODE_ENV"
if (define.dots.getEntry(tail)) |entry| {
for (entry.value) |*part| {
- // ["process", "env"] == ["process", "env"]
+ // ["process", "env"] === ["process", "env"] (if that actually worked)
if (arePartsEqual(part.parts, parts)) {
part.data = part.data.merge(user_define.value);
didFind = true;
diff --git a/src/js_ast.zig b/src/js_ast.zig
index 42138301b..321c69c33 100644
--- a/src/js_ast.zig
+++ b/src/js_ast.zig
@@ -592,6 +592,10 @@ pub const Symbol = struct {
symbols_for_source: [][]Symbol,
pub fn get(self: *Map, ref: Ref) ?Symbol {
+ if (Ref.isSourceIndexNull(ref.source_index)) {
+ return null;
+ }
+
return self.symbols_for_source[ref.source_index][ref.inner_index];
}
diff --git a/src/js_lexer.zig b/src/js_lexer.zig
index d61850057..9108285aa 100644
--- a/src/js_lexer.zig
+++ b/src/js_lexer.zig
@@ -29,6 +29,7 @@ pub const JSONOptions = struct {
};
pub const Lexer = struct {
+
// pub const Error = error{
// UnexpectedToken,
// EndOfFile,
diff --git a/src/js_lexer_tables.zig b/src/js_lexer_tables.zig
index 4b9977699..7a1bf705e 100644
--- a/src/js_lexer_tables.zig
+++ b/src/js_lexer_tables.zig
@@ -537,6 +537,7 @@ pub const JSXEntityMap = std.StringHashMap(CodePoint);
pub var jsxEntity: JSXEntityMap = undefined;
+// There's probably a way to move this to comptime
pub fn initJSXEntityMap() !void {
jsxEntity = JSXEntityMap.init(alloc.dynamic);
// return jsxEntity;
diff --git a/src/js_parser.zig b/src/js_parser.zig
index f8c787f3b..d202fcc54 100644
--- a/src/js_parser.zig
+++ b/src/js_parser.zig
@@ -1,10330 +1 @@
-const std = @import("std");
-const logger = @import("logger.zig");
-const js_lexer = @import("js_lexer.zig");
-const importRecord = @import("import_record.zig");
-const js_ast = @import("js_ast.zig");
-const options = @import("options.zig");
-const alloc = @import("alloc.zig");
-
-const js_printer = @import("js_printer.zig");
-const renamer = @import("renamer.zig");
-
-const fs = @import("fs.zig");
-usingnamespace @import("strings.zig");
-usingnamespace @import("ast/base.zig");
-usingnamespace js_ast.G;
-usingnamespace @import("defines.zig");
-
-const ImportKind = importRecord.ImportKind;
-const BindingNodeIndex = js_ast.BindingNodeIndex;
-
-const StmtNodeIndex = js_ast.StmtNodeIndex;
-const ExprNodeIndex = js_ast.ExprNodeIndex;
-const ExprNodeList = js_ast.ExprNodeList;
-const StmtNodeList = js_ast.StmtNodeList;
-const BindingNodeList = js_ast.BindingNodeList;
-const assert = std.debug.assert;
-
-const LocRef = js_ast.LocRef;
-const S = js_ast.S;
-const B = js_ast.B;
-const G = js_ast.G;
-const T = js_lexer.T;
-const E = js_ast.E;
-const Stmt = js_ast.Stmt;
-const Expr = js_ast.Expr;
-const Binding = js_ast.Binding;
-const Symbol = js_ast.Symbol;
-const Level = js_ast.Op.Level;
-const Op = js_ast.Op;
-const Scope = js_ast.Scope;
-const locModuleScope = logger.Loc.Empty;
-
-pub fn ExpressionTransposer(comptime ctx: type, visitor: fn (ptr: *ctx, arg: Expr, state: anytype) Expr) type {
- return struct {
- context: *Context,
-
- pub fn init(c: *Context) @This() {
- return @This(){
- .context = c,
- };
- }
-
- pub fn maybeTransposeIf(self: *@This(), arg: Expr, state: anytype) Expr {
- switch (arg.data) {
- .e_if => |ex| {
- ex.yes = self.maybeTransposeIf(ex.yes, state);
- ex.no = self.maybeTransposeIf(ex.no, state);
- return arg;
- },
- else => {
- return visitor(self.context, arg, state);
- },
- }
- }
- pub const Context = ctx;
- };
-}
-
-pub fn locAfterOp(e: E.Binary) logger.Loc {
- if (e.left.loc.start < e.right.loc.start) {
- return e.right.loc;
- } else {
- // handle the case when we have transposed the operands
- return e.left.loc;
- }
-}
-
-pub const ImportScanner = struct {
- stmts: []Stmt = &([_]Stmt{}),
- kept_import_equals: bool = false,
- removed_import_equals: bool = false,
- pub fn scan(p: *P, stmts: []Stmt) !ImportScanner {
- var scanner = ImportScanner{};
- var stmts_end: usize = 0;
-
- for (stmts) |_stmt| {
- // zls needs the hint, it seems.
- const stmt: Stmt = _stmt;
- switch (stmt.data) {
- .s_import => |st| {
- var record: ImportRecord = p.import_records.items[st.import_record_index];
-
- // The official TypeScript compiler always removes unused imported
- // symbols. However, we deliberately deviate from the official
- // TypeScript compiler's behavior doing this in a specific scenario:
- // we are not bundling, symbol renaming is off, and the tsconfig.json
- // "importsNotUsedAsValues" setting is present and is not set to
- // "remove".
- //
- // This exists to support the use case of compiling partial modules for
- // compile-to-JavaScript languages such as Svelte. These languages try
- // to reference imports in ways that are impossible for esbuild to know
- // about when esbuild is only given a partial module to compile. Here
- // is an example of some Svelte code that might use esbuild to convert
- // TypeScript to JavaScript:
- //
- // <script lang="ts">
- // import Counter from './Counter.svelte';
- // export let name: string = 'world';
- // </script>
- // <main>
- // <h1>Hello {name}!</h1>
- // <Counter />
- // </main>
- //
- // Tools that use esbuild to compile TypeScript code inside a Svelte
- // file like this only give esbuild the contents of the <script> tag.
- // These tools work around this missing import problem when using the
- // official TypeScript compiler by hacking the TypeScript AST to
- // remove the "unused import" flags. This isn't possible in esbuild
- // because esbuild deliberately does not expose an AST manipulation
- // API for performance reasons.
- //
- // We deviate from the TypeScript compiler's behavior in this specific
- // case because doing so is useful for these compile-to-JavaScript
- // languages and is benign in other cases. The rationale is as follows:
- //
- // * If "importsNotUsedAsValues" is absent or set to "remove", then
- // we don't know if these imports are values or types. It's not
- // safe to keep them because if they are types, the missing imports
- // will cause run-time failures because there will be no matching
- // exports. It's only safe keep imports if "importsNotUsedAsValues"
- // is set to "preserve" or "error" because then we can assume that
- // none of the imports are types (since the TypeScript compiler
- // would generate an error in that case).
- //
- // * If we're bundling, then we know we aren't being used to compile
- // a partial module. The parser is seeing the entire code for the
- // module so it's safe to remove unused imports. And also we don't
- // want the linker to generate errors about missing imports if the
- // imported file is also in the bundle.
- //
- // * If identifier minification is enabled, then using esbuild as a
- // partial-module transform library wouldn't work anyway because
- // the names wouldn't match. And that means we're minifying so the
- // user is expecting the output to be as small as possible. So we
- // should omit unused imports.
- //
- // const keep_unused_imports = !p.options.trim_unused_imports;
- var did_remove_star_loc = false;
- const keep_unused_imports = true;
-
- // TypeScript always trims unused imports. This is important for
- // correctness since some imports might be fake (only in the type
- // system and used for type-only imports).
- if (!keep_unused_imports) {
- var found_imports = false;
- var is_unused_in_typescript = false;
-
- if (st.default_name) |default_name| {
- found_imports = true;
- var symbol = p.symbols.items[default_name.ref.?.inner_index];
-
- // TypeScript has a separate definition of unused
- if (p.options.ts and p.ts_use_counts.items[default_name.ref.?.inner_index] != 0) {
- is_unused_in_typescript = false;
- }
-
- // Remove the symbol if it's never used outside a dead code region
- if (symbol.use_count_estimate == 0) {
- st.default_name = null;
- }
- }
-
- // Remove the star import if it's unused
- if (st.star_name_loc) |star_name| {
- found_imports = true;
- const symbol = p.symbols.items[st.namespace_ref.inner_index];
-
- // TypeScript has a separate definition of unused
- if (p.options.ts and p.ts_use_counts.items[st.namespace_ref.inner_index] != 0) {
- is_unused_in_typescript = false;
- }
-
- // Remove the symbol if it's never used outside a dead code region
- if (symbol.use_count_estimate == 0) {
- // Make sure we don't remove this if it was used for a property
- // access while bundling
- var has_any = false;
-
- if (p.import_items_for_namespace.get(st.namespace_ref)) |entry| {
- if (entry.count() > 0) {
- has_any = true;
- }
- }
-
- if (!has_any) {
- st.star_name_loc = null;
- did_remove_star_loc = true;
- }
- }
- }
-
- // Remove items if they are unused
- if (st.items.len > 0) {
- found_imports = false;
- var items_end: usize = 0;
- var i: usize = 0;
- while (i < st.items.len) : (i += 1) {
- const item = st.items[i];
- const ref = item.name.ref.?;
- const symbol: Symbol = p.symbols.items[ref.inner_index];
-
- // TypeScript has a separate definition of unused
- if (p.options.ts and p.ts_use_counts.items[ref.inner_index] != 0) {
- is_unused_in_typescript = false;
- }
-
- // Remove the symbol if it's never used outside a dead code region
- if (symbol.use_count_estimate != 0) {
- st.items[items_end] = item;
- items_end += 1;
- }
- }
-
- if (items_end < st.items.len - 1) {
- var list = List(js_ast.ClauseItem).fromOwnedSlice(p.allocator, st.items);
- list.shrinkAndFree(items_end);
- st.items = list.toOwnedSlice();
- }
- }
-
- // -- Original Comment --
- // Omit this statement if we're parsing TypeScript and all imports are
- // unused. Note that this is distinct from the case where there were
- // no imports at all (e.g. "import 'foo'"). In that case we want to keep
- // the statement because the user is clearly trying to import the module
- // for side effects.
- //
- // This culling is important for correctness when parsing TypeScript
- // because a) the TypeScript compiler does ths and we want to match it
- // and b) this may be a fake module that only exists in the type system
- // and doesn't actually exist in reality.
- //
- // We do not want to do this culling in JavaScript though because the
- // module may have side effects even if all imports are unused.
- // -- Original Comment --
-
- // jarred: I think, in this project, we want this behavior, even in JavaScript.
- // I think this would be a big performance improvement.
- // The less you import, the less code you transpile.
- // Side-effect imports are nearly always done through identifier-less imports
- // e.g. `import 'fancy-stylesheet-thing/style.css';`
- // This is a breaking change though. We can make it an option with some guardrail
- // so maybe if it errors, it shows a suggestion "retry without trimming unused imports"
- if (found_imports and !p.options.preserve_unused_imports_ts) {
- // Ignore import records with a pre-filled source index. These are
- // for injected files and we definitely do not want to trim these.
- if (!Ref.isSourceIndexNull(record.source_index)) {
- record.is_unused = true;
- continue;
- }
- }
- }
-
- if (p.options.trim_unused_imports) {
- if (st.star_name_loc != null or did_remove_star_loc) {
- // -- Original Comment --
- // If we're bundling a star import and the namespace is only ever
- // used for property accesses, then convert each unique property to
- // a clause item in the import statement and remove the star import.
- // That will cause the bundler to bundle them more efficiently when
- // both this module and the imported module are in the same group.
- //
- // Before:
- //
- // import * as ns from 'foo'
- // console.log(ns.a, ns.b)
- //
- // After:
- //
- // import {a, b} from 'foo'
- // console.log(a, b)
- //
- // This is not done if the namespace itself is used, because in that
- // case the code for the namespace will have to be generated. This is
- // determined by the symbol count because the parser only counts the
- // star import as used if it was used for something other than a
- // property access:
- //
- // import * as ns from 'foo'
- // console.log(ns, ns.a, ns.b)
- //
- // -- Original Comment --
-
- // jarred: we don't use the same grouping mechanism as esbuild
- // but, we do this anyway.
- // The reasons why are:
- // * It makes static analysis for other tools simpler.
- // * I imagine browsers may someday do some optimizations
- // when it's "easier" to know only certain modules are used
- // For example, if you're importing a component from a design system
- // it's really stupid to import all 1,000 components from that design system
- // when you just want <Button />
- const namespace_ref = st.namespace_ref;
- const convert_star_to_clause = p.symbols.items[namespace_ref.inner_index].use_count_estimate == 0;
-
- if (convert_star_to_clause and !keep_unused_imports) {
- st.star_name_loc = null;
- }
-
- // "importItemsForNamespace" has property accesses off the namespace
- if (p.import_items_for_namespace.get(namespace_ref)) |import_items| {
- var count = import_items.count();
- if (count > 0) {
- // Sort keys for determinism
- var sorted: []string = try p.allocator.alloc(string, count);
- var iter = import_items.iterator();
- var i: usize = 0;
- while (iter.next()) |item| {
- sorted[i] = item.key;
- i += 1;
- }
- strings.sortAsc(sorted);
-
- if (convert_star_to_clause) {
- // Create an import clause for these items. Named imports will be
- // automatically created later on since there is now a clause.
- var items = try p.allocator.alloc(js_ast.ClauseItem, count);
- try p.declared_symbols.ensureUnusedCapacity(count);
- i = 0;
- for (sorted) |alias| {
- const name: LocRef = import_items.get(alias) orelse unreachable;
- const original_name = p.symbols.items[name.ref.?.inner_index].original_name;
- items[i] = js_ast.ClauseItem{
- .alias = alias,
- .alias_loc = name.loc,
- .name = name,
- .original_name = original_name,
- };
- p.declared_symbols.appendAssumeCapacity(js_ast.DeclaredSymbol{
- .ref = name.ref.?,
- .is_top_level = true,
- });
-
- i += 1;
- }
-
- if (st.items.len > 0) {
- p.panic("The syntax \"import {{x}}, * as y from 'path'\" isn't valid", .{});
- }
-
- st.items = items;
- } else {
- // If we aren't converting this star import to a clause, still
- // create named imports for these property accesses. This will
- // cause missing imports to generate useful warnings.
- //
- // It will also improve bundling efficiency for internal imports
- // by still converting property accesses off the namespace into
- // bare identifiers even if the namespace is still needed.
-
- for (sorted) |alias| {
- const name: LocRef = import_items.get(alias) orelse unreachable;
-
- try p.named_imports.put(name.ref.?, js_ast.NamedImport{
- .alias = alias,
- .alias_loc = name.loc,
- .namespace_ref = st.namespace_ref,
- .import_record_index = st.import_record_index,
- });
-
- // Make sure the printer prints this as a property access
- var symbol: Symbol = p.symbols.items[name.ref.?.inner_index];
- symbol.namespace_alias = G.NamespaceAlias{ .namespace_ref = st.namespace_ref, .alias = alias };
- p.symbols.items[name.ref.?.inner_index] = symbol;
- }
- }
- }
- }
- }
- }
-
- try p.import_records_for_current_part.append(st.import_record_index);
-
- if (st.star_name_loc != null) {
- record.contains_import_star = true;
- }
-
- if (st.default_name != null) {
- record.contains_default_alias = true;
- } else {
- for (st.items) |item| {
- if (strings.eql(item.alias, "default")) {
- record.contains_default_alias = true;
- break;
- }
- }
- }
- },
- .s_function => |st| {
- if (st.func.flags.is_export) {
- if (st.func.name) |name| {
- try p.recordExport(name.loc, p.symbols.items[name.ref.?.inner_index].original_name, name.ref.?);
- } else {
- try p.log.addRangeError(p.source, logger.Range{ .loc = st.func.open_parens_loc, .len = 2 }, "Exported functions must have a name");
- }
- }
- },
- .s_class => |st| {
- if (st.is_export) {
- if (st.class.class_name) |name| {
- try p.recordExport(name.loc, p.symbols.items[name.ref.?.inner_index].original_name, name.ref.?);
- } else {
- try p.log.addRangeError(p.source, logger.Range{ .loc = st.class.body_loc, .len = 0 }, "Exported classes must have a name");
- }
- }
- },
- .s_local => |st| {
- if (st.is_export) {
- for (st.decls) |decl| {
- p.recordExportedBinding(decl.binding);
- }
- }
-
- // Remove unused import-equals statements, since those likely
- // correspond to types instead of values
- if (st.was_ts_import_equals and !st.is_export and st.decls.len > 0) {
- var decl = st.decls[0];
-
- // Skip to the underlying reference
- var value = decl.value;
- if (decl.value) |val| {
- while (true) {
- if (@as(Expr.Tag, val.data) == .e_dot) {
- value = val.data.e_dot.target;
- } else {
- break;
- }
- }
- }
-
- // Is this an identifier reference and not a require() call?
- if (value) |val| {
- if (@as(Expr.Tag, val.data) == .e_identifier) {
- // Is this import statement unused?
- if (@as(Binding.Tag, decl.binding.data) == .b_identifier and p.symbols.items[decl.binding.data.b_identifier.ref.inner_index].use_count_estimate == 0) {
- p.ignoreUsage(val.data.e_identifier.ref);
-
- scanner.removed_import_equals = true;
- continue;
- } else {
- scanner.kept_import_equals = true;
- }
- }
- }
- }
- },
- .s_export_default => |st| {
- try p.recordExport(st.default_name.loc, "default", st.default_name.ref.?);
- },
- .s_export_clause => |st| {
- for (st.items) |item| {
- try p.recordExport(item.alias_loc, item.alias, item.name.ref.?);
- }
- },
- .s_export_star => |st| {
- try p.import_records_for_current_part.append(st.import_record_index);
-
- if (st.alias) |alias| {
- // "export * as ns from 'path'"
- try p.named_imports.put(st.namespace_ref, js_ast.NamedImport{
- .alias = null,
- .alias_is_star = true,
- .alias_loc = alias.loc,
- .namespace_ref = Ref.None,
- .import_record_index = st.import_record_index,
- .is_exported = true,
- });
- try p.recordExport(alias.loc, alias.original_name, st.namespace_ref);
- } else {
- // "export * from 'path'"
- try p.export_star_import_records.append(st.import_record_index);
- }
- },
- .s_export_from => |st| {
- try p.import_records_for_current_part.append(st.import_record_index);
-
- for (st.items) |item| {
- const ref = item.name.ref orelse p.panic("Expected export from item to have a name {s}", .{st});
- // Note that the imported alias is not item.Alias, which is the
- // exported alias. This is somewhat confusing because each
- // SExportFrom statement is basically SImport + SExportClause in one.
- try p.named_imports.put(ref, js_ast.NamedImport{
- .alias_is_star = false,
- .alias = item.original_name,
- .alias_loc = item.name.loc,
- .namespace_ref = st.namespace_ref,
- .import_record_index = st.import_record_index,
- .is_exported = true,
- });
- try p.recordExport(item.name.loc, item.alias, ref);
- }
- },
- else => {},
- }
-
- stmts[stmts_end] = stmt;
- stmts_end += 1;
- }
- scanner.stmts = stmts[0..stmts_end];
- return scanner;
- }
-};
-
-pub const SideEffects = enum {
- could_have_side_effects,
- no_side_effects,
-
- pub const Result = struct {
- side_effects: SideEffects,
- ok: bool = false,
- value: bool = false,
- };
-
- pub fn toNumber(data: Expr.Data) ?f64 {
- switch (data) {
- .e_null => |e| {
- return 0;
- },
- .e_undefined => |e| {
- return std.math.nan_f64;
- },
- .e_boolean => |e| {
- return if (e.value) 1.0 else 0.0;
- },
- .e_number => |e| {
- return e.value;
- },
- else => {},
- }
-
- return null;
- }
-
- pub fn isPrimitiveToReorder(data: Expr.Data) bool {
- switch (data) {
- .e_null, .e_undefined, .e_string, .e_boolean, .e_number, .e_big_int => {
- return true;
- },
- else => {
- return false;
- },
- }
- }
-
- pub const Equality = struct { equal: bool = false, ok: bool = false };
-
- // Returns "equal, ok". If "ok" is false, then nothing is known about the two
- // values. If "ok" is true, the equality or inequality of the two values is
- // stored in "equal".
- pub fn eql(left: Expr.Data, right: Expr.Data) Equality {
- var equality = Equality{};
- switch (left) {
- .e_null => |l| {
- equality.equal = @as(Expr.Tag, right) == Expr.Tag.e_null;
- equality.ok = equality.equal;
- },
- .e_undefined => |l| {
- equality.equal = @as(Expr.Tag, right) == Expr.Tag.e_undefined;
- equality.ok = equality.equal;
- },
- .e_boolean => |l| {
- equality.ok = @as(Expr.Tag, right) == Expr.Tag.e_boolean;
- equality.equal = l.value == right.e_boolean.value;
- },
- .e_number => |l| {
- equality.ok = @as(Expr.Tag, right) == Expr.Tag.e_number;
- equality.equal = l.value == right.e_number.value;
- },
- .e_big_int => |l| {
- equality.ok = @as(Expr.Tag, right) == Expr.Tag.e_big_int;
- equality.equal = strings.eql(l.value, right.e_big_int.value);
- },
- .e_string => |l| {
- equality.ok = @as(Expr.Tag, right) == Expr.Tag.e_string;
- equality.equal = std.mem.eql(u16, l.value, right.e_string.value);
- },
- else => {},
- }
-
- return equality;
- }
-
- // Returns true if this expression is known to result in a primitive value (i.e.
- // null, undefined, boolean, number, bigint, or string), even if the expression
- // cannot be removed due to side effects.
- pub fn isPrimitiveWithSideEffects(data: Expr.Data) bool {
- switch (data) {
- .e_null, .e_undefined, .e_boolean, .e_number, .e_big_int, .e_string => {
- return true;
- },
- .e_unary => |e| {
- switch (e.op) {
- // number or bigint
- .un_pos,
- .un_neg,
- .un_cpl,
- .un_pre_dec,
- .un_pre_inc,
- .un_post_dec,
- .un_post_inc,
- // boolean
- .un_not,
- .un_delete,
- // undefined
- .un_void,
- // string
- .un_typeof,
- => {
- return true;
- },
- else => {},
- }
- },
- .e_binary => |e| {
- switch (e.op) {
- // boolean
- .bin_lt,
- .bin_le,
- .bin_gt,
- .bin_ge,
- .bin_in,
- .bin_instanceof,
- .bin_loose_eq,
- .bin_loose_ne,
- .bin_strict_eq,
- .bin_strict_ne,
- // string, number, or bigint
- .bin_add,
- .bin_add_assign,
- // number or bigint
- .bin_sub,
- .bin_mul,
- .bin_div,
- .bin_rem,
- .bin_pow,
- .bin_sub_assign,
- .bin_mul_assign,
- .bin_div_assign,
- .bin_rem_assign,
- .bin_pow_assign,
- .bin_shl,
- .bin_shr,
- .bin_u_shr,
- .bin_shl_assign,
- .bin_shr_assign,
- .bin_u_shr_assign,
- .bin_bitwise_or,
- .bin_bitwise_and,
- .bin_bitwise_xor,
- .bin_bitwise_or_assign,
- .bin_bitwise_and_assign,
- .bin_bitwise_xor_assign,
- => {
- return true;
- },
-
- // These always return one of the arguments unmodified
- .bin_logical_and, .bin_logical_or, .bin_nullish_coalescing, .bin_logical_and_assign, .bin_logical_or_assign, .bin_nullish_coalescing_assign => {
- return isPrimitiveWithSideEffects(e.left.data) and isPrimitiveWithSideEffects(e.right.data);
- },
- .bin_comma => {
- return isPrimitiveWithSideEffects(e.right.data);
- },
- }
- },
- .e_if => {
- return isPrimitiveWithSideEffects(e.yes.data) and isPrimitiveWithSideEffects(e.no.data);
- },
- else => {},
- }
- return false;
- }
-
- // Returns true if the result of the "typeof" operator on this expression is
- // statically determined and this expression has no side effects (i.e. can be
- // removed without consequence).
- pub fn toTypeof(data: Expr.Data) ?string {
- switch (data) {
- .e_null => {
- return "object";
- },
- .e_undefined => {
- return "undefined";
- },
- .e_boolean => {
- return "boolean";
- },
- .e_number => {
- return "number";
- },
- .e_big_int => {
- return "bigint";
- },
- .e_string => {
- return "string";
- },
- .e_function, .e_arrow => {
- return "function";
- },
- else => {},
- }
-
- return null;
- }
-
- pub fn toNullOrUndefined(exp: Expr.Data) Result {
- switch (exp) {
- // Never null or undefined
- .e_boolean, .e_number, .e_string, .e_reg_exp, .e_function, .e_arrow, .e_big_int => {
- return Result{ .value = false, .side_effects = SideEffects.no_side_effects, .ok = true };
- },
-
- .e_object, .e_array, .e_class => {
- return Result{ .value = false, .side_effects = .could_have_side_effects, .ok = true };
- },
-
- // always anull or undefined
- .e_null, .e_undefined => {
- return Result{ .value = true, .side_effects = .could_have_side_effects, .ok = true };
- },
-
- .e_unary => |e| {
- switch (e.op) {
- // Always number or bigint
- .un_pos, .un_neg, .un_cpl, .un_pre_dec, .un_pre_inc, .un_post_dec, .un_post_inc => {
- return Result{ .ok = true, .value = false, .side_effects = SideEffects.could_have_side_effects };
- },
- // Always undefined
- .un_not, .un_typeof, .un_delete => {
- return Result{ .value = true, .side_effects = .could_have_side_effects, .ok = true };
- },
-
- .un_void => {
- return Result{ .value = true, .side_effects = .could_have_side_effects, .ok = true };
- },
-
- else => {},
- }
- },
-
- .e_binary => |e| {
- switch (e.op) {
- // always string or number or bigint
- .bin_add,
- .bin_add_assign,
- // always number or bigint
- .bin_sub,
- .bin_mul,
- .bin_div,
- .bin_rem,
- .bin_pow,
- .bin_sub_assign,
- .bin_mul_assign,
- .bin_div_assign,
- .bin_rem_assign,
- .bin_pow_assign,
- .bin_shl,
- .bin_shr,
- .bin_u_shr,
- .bin_shl_assign,
- .bin_shr_assign,
- .bin_u_shr_assign,
- .bin_bitwise_or,
- .bin_bitwise_and,
- .bin_bitwise_xor,
- .bin_bitwise_or_assign,
- .bin_bitwise_and_assign,
- .bin_bitwise_xor_assign,
- // always boolean
- .bin_lt,
- .bin_le,
- .bin_gt,
- .bin_ge,
- .bin_in,
- .bin_instanceof,
- .bin_loose_eq,
- .bin_loose_ne,
- .bin_strict_eq,
- .bin_strict_ne,
- => {
- return Result{ .ok = true, .value = false, .side_effects = SideEffects.could_have_side_effects };
- },
-
- .bin_comma => {
- const res = toNullOrUndefined(e.right.data);
- if (res.ok) {
- return Result{ .ok = true, .value = res.value, .side_effects = SideEffects.could_have_side_effects };
- }
- },
- else => {},
- }
- },
- else => {},
- }
-
- return Result{ .ok = false, .value = false, .side_effects = SideEffects.could_have_side_effects };
- }
-
- pub fn toBoolean(exp: Expr.Data) Result {
- switch (exp) {
- .e_null, .e_undefined => {
- return Result{ .ok = true, .value = false, .side_effects = .no_side_effects };
- },
- .e_boolean => |e| {
- return Result{ .ok = true, .value = e.value, .side_effects = .no_side_effects };
- },
- .e_number => |e| {
- return Result{ .ok = true, .value = e.value != 0.0 and !std.math.isNan(e.value), .side_effects = .no_side_effects };
- },
- .e_big_int => |e| {
- return Result{ .ok = true, .value = !strings.eql(e.value, "0"), .side_effects = .no_side_effects };
- },
- .e_string => |e| {
- return Result{ .ok = true, .value = e.value.len > 0, .side_effects = .no_side_effects };
- },
- .e_function, .e_arrow, .e_reg_exp => {
- return Result{ .ok = true, .value = true, .side_effects = .no_side_effects };
- },
- .e_object, .e_array, .e_class => {
- return Result{ .ok = true, .value = true, .side_effects = .could_have_side_effects };
- },
- .e_unary => |e_| {
- switch (e_.op) {
- .un_void => {
- return Result{ .ok = true, .value = false, .side_effects = .could_have_side_effects };
- },
- .un_typeof => {
- // Never an empty string
-
- return Result{ .ok = true, .value = true, .side_effects = .could_have_side_effects };
- },
- .un_not => {
- var result = toBoolean(e_.value.data);
- if (result.ok) {
- result.value = !result.value;
- return result;
- }
- },
- else => {},
- }
- },
- .e_binary => |e_| {
- switch (e_.op) {
- .bin_logical_or => {
- // "anything || truthy" is truthy
- const result = toBoolean(e_.right.data);
- if (result.value and result.ok) {
- return Result{ .ok = true, .value = true, .side_effects = .could_have_side_effects };
- }
- },
- .bin_logical_and => {
- // "anything && falsy" is falsy
- const result = toBoolean(e_.right.data);
- if (!result.value and result.ok) {
- return Result{ .ok = true, .value = false, .side_effects = .could_have_side_effects };
- }
- },
- .bin_comma => {
- // "anything, truthy/falsy" is truthy/falsy
- var result = toBoolean(e_.right.data);
- if (result.ok) {
- result.side_effects = .could_have_side_effects;
- return result;
- }
- },
- else => {},
- }
- },
- else => {},
- }
-
- return Result{ .ok = false, .value = false, .side_effects = SideEffects.could_have_side_effects };
- }
-};
-
-const ExprOrLetStmt = struct {
- stmt_or_expr: js_ast.StmtOrExpr,
- decls: []G.Decl = &([_]G.Decl{}),
-};
-
-const FunctionKind = enum { stmt, expr };
-
-const EightLetterMatcher = strings.ExactSizeMatcher(8);
-
-const AsyncPrefixExpression = enum {
- none,
- is_yield,
- is_async,
- is_await,
-
- pub fn find(ident: string) AsyncPrefixExpression {
- if (ident.len != 5) {
- return .none;
- }
-
- switch (EightLetterMatcher.match(ident)) {
- EightLetterMatcher.case("yield") => {
- return .is_yield;
- },
- EightLetterMatcher.case("await") => {
- return .is_await;
- },
- EightLetterMatcher.case("async") => {
- return .is_async;
- },
-
- else => {
- return .none;
- },
- }
- }
-};
-
-const IdentifierOpts = struct {
- assign_target: js_ast.AssignTarget = js_ast.AssignTarget.none,
- is_delete_target: bool = false,
- was_originally_identifier: bool = false,
-};
-
-fn statementCaresAboutScope(stmt: Stmt) bool {
- switch (stmt.data) {
- .s_block,
- .s_empty,
- .s_debugger,
- .s_expr,
- .s_if,
- .s_for,
- .s_for_in,
- .s_for_of,
- .s_do_while,
- .s_while,
- .s_with,
- .s_try,
- .s_switch,
- .s_return,
- .s_throw,
- .s_break,
- .s_continue,
- .s_directive,
- => {
- return false;
- },
- .s_local => |s| {
- return s.kind != .k_var;
- },
- else => {
- return true;
- },
- }
-}
-
-const ExprIn = struct {
- // This tells us if there are optional chain expressions (EDot, EIndex, or
- // ECall) that are chained on to this expression. Because of the way the AST
- // works, chaining expressions on to this expression means they are our
- // parent expressions.
- //
- // Some examples:
- //
- // a?.b.c // EDot
- // a?.b[c] // EIndex
- // a?.b() // ECall
- //
- // Note that this is false if our parent is a node with a OptionalChain
- // value of OptionalChainStart. That means it's the start of a new chain, so
- // it's not considered part of this one.
- //
- // Some examples:
- //
- // a?.b?.c // EDot
- // a?.b?.[c] // EIndex
- // a?.b?.() // ECall
- //
- // Also note that this is false if our parent is a node with a OptionalChain
- // value of OptionalChainNone. That means it's outside parentheses, which
- // means it's no longer part of the chain.
- //
- // Some examples:
- //
- // (a?.b).c // EDot
- // (a?.b)[c] // EIndex
- // (a?.b)() // ECall
- //
- has_chain_parent: bool = false,
-
- // If our parent is an ECall node with an OptionalChain value of
- // OptionalChainStart, then we will need to store the value for the "this" of
- // that call somewhere if the current expression is an optional chain that
- // ends in a property access. That's because the value for "this" will be
- // used twice: once for the inner optional chain and once for the outer
- // optional chain.
- //
- // Example:
- //
- // // Original
- // a?.b?.();
- //
- // // Lowered
- // var _a;
- // (_a = a == null ? void 0 : a.b) == null ? void 0 : _a.call(a);
- //
- // In the example above we need to store "a" as the value for "this" so we
- // can substitute it back in when we call "_a" if "_a" is indeed present.
- // See also "thisArgFunc" and "thisArgWrapFunc" in "exprOut".
- store_this_arg_for_parent_optional_chain: bool = false,
-
- // Certain substitutions of identifiers are disallowed for assignment targets.
- // For example, we shouldn't transform "undefined = 1" into "void 0 = 1". This
- // isn't something real-world code would do but it matters for conformance
- // tests.
- assign_target: js_ast.AssignTarget = js_ast.AssignTarget.none,
-};
-
-const ExprOut = struct {
- // True if the child node is an optional chain node (EDot, EIndex, or ECall
- // with an IsOptionalChain value of true)
- child_contains_optional_chain: bool = false,
-};
-
-const Tup = std.meta.Tuple;
-
-// This function exists to tie all of these checks together in one place
-fn isEvalOrArguments(name: string) bool {
- return strings.eql(name, "eval") or strings.eql(name, "arguments");
-}
-
-const PrependTempRefsOpts = struct {
- fn_body_loc: ?logger.Loc = null,
- kind: StmtsKind = StmtsKind.none,
-};
-
-pub const StmtsKind = enum {
- none,
- loop_body,
- fn_body,
-};
-
-fn notimpl() noreturn {
- std.debug.panic("Not implemented yet!!", .{});
-}
-
-fn lexerpanic() noreturn {
- std.debug.panic("LexerPanic", .{});
-}
-
-fn fail() noreturn {
- std.debug.panic("Something went wrong :cry;", .{});
-}
-
-const ExprBindingTuple = struct { expr: ?ExprNodeIndex = null, binding: ?Binding = null, override_expr: ?ExprNodeIndex = null };
-
-const TempRef = struct {
- ref: Ref,
- value: ?Expr = null,
-};
-
-const ImportNamespaceCallOrConstruct = struct {
- ref: js_ast.Ref,
- is_construct: bool = false,
-};
-
-const ThenCatchChain = struct {
- next_target: js_ast.Expr.Data,
- has_multiple_args: bool = false,
- has_catch: bool = false,
-};
-
-const ParsedPath = struct { loc: logger.Loc, text: string };
-
-const StrictModeFeature = enum {
- with_statement,
- delete_bare_name,
- for_in_var_init,
- eval_or_arguments,
- reserved_word,
- legacy_octal_literal,
- legacy_octal_escape,
- if_else_function_stmt,
-};
-
-const SymbolMergeResult = enum {
- forbidden,
- replace_with_new,
- overwrite_with_new,
- keep_existing,
- become_private_get_set_pair,
- become_private_static_get_set_pair,
-};
-
-const Map = std.AutoHashMap;
-
-const List = std.ArrayList;
-const LocList = List(logger.Loc);
-const StmtList = List(Stmt);
-
-const SymbolUseMap = Map(js_ast.Ref, js_ast.Symbol.Use);
-const StringRefMap = std.StringHashMap(js_ast.Ref);
-const StringBoolMap = std.StringHashMap(bool);
-const RefBoolMap = Map(js_ast.Ref, bool);
-const RefRefMap = Map(js_ast.Ref, js_ast.Ref);
-const ImportRecord = importRecord.ImportRecord;
-const Flags = js_ast.Flags;
-const ScopeOrder = struct {
- loc: logger.Loc,
- scope: *js_ast.Scope,
-};
-const EnumValueType = enum {
- unknown,
- string,
- numeric,
-};
-
-const ParenExprOpts = struct {
- async_range: logger.Range = logger.Range.None,
- is_async: bool = false,
- force_arrow_fn: bool = false,
-};
-
-const AwaitOrYield = enum {
- allow_ident,
- allow_expr,
- forbid_all,
-};
-
-// This is function-specific information used during parsing. It is saved and
-// restored on the call stack around code that parses nested functions and
-// arrow expressions.
-const FnOrArrowDataParse = struct {
- async_range: ?logger.Range = null,
- allow_await: AwaitOrYield = AwaitOrYield.allow_ident,
- allow_yield: AwaitOrYield = AwaitOrYield.allow_ident,
- allow_super_call: bool = false,
- is_top_level: bool = false,
- is_constructor: bool = false,
- is_typescript_declare: bool = false,
- arrow_arg_errors: ?DeferredArrowArgErrors = null,
-
- // In TypeScript, forward declarations of functions have no bodies
- allow_missing_body_for_type_script: bool = false,
-
- // Allow TypeScript decorators in function arguments
- allow_ts_decorators: bool = false,
-
- pub fn i() FnOrArrowDataParse {
- return FnOrArrowDataParse{ .allow_await = AwaitOrYield.forbid_all };
- }
-};
-
-// This is function-specific information used during visiting. It is saved and
-// restored on the call stack around code that parses nested functions and
-// arrow expressions.
-const FnOrArrowDataVisit = struct {
- super_index_ref: ?*js_ast.Ref = null,
-
- is_arrow: bool = false,
- is_async: bool = false,
- is_inside_loop: bool = false,
- is_inside_switch: bool = false,
- is_outside_fn_or_arrow: bool = false,
-
- // This is used to silence unresolvable imports due to "require" calls inside
- // a try/catch statement. The assumption is that the try/catch statement is
- // there to handle the case where the reference to "require" crashes.
- try_body_count: i32 = 0,
-};
-
-// This is function-specific information used during visiting. It is saved and
-// restored on the call stack around code that parses nested functions (but not
-// nested arrow functions).
-const FnOnlyDataVisit = struct {
- // This is a reference to the magic "arguments" variable that exists inside
- // functions in JavaScript. It will be non-nil inside functions and nil
- // otherwise.
- arguments_ref: ?js_ast.Ref = null,
-
- // Arrow functions don't capture the value of "this" and "arguments". Instead,
- // the values are inherited from the surrounding context. If arrow functions
- // are turned into regular functions due to lowering, we will need to generate
- // local variables to capture these values so they are preserved correctly.
- this_capture_ref: ?js_ast.Ref = null,
- arguments_capture_ref: ?js_ast.Ref = null,
-
- // Inside a static class property initializer, "this" expressions should be
- // replaced with the class name.
- this_class_static_ref: ?js_ast.Ref = null,
-
- // If we're inside an async arrow function and async functions are not
- // supported, then we will have to convert that arrow function to a generator
- // function. That means references to "arguments" inside the arrow function
- // will have to reference a captured variable instead of the real variable.
- is_inside_async_arrow_fn: bool = false,
-
- // If false, the value for "this" is the top-level module scope "this" value.
- // That means it's "undefined" for ECMAScript modules and "exports" for
- // CommonJS modules. We track this information so that we can substitute the
- // correct value for these top-level "this" references at compile time instead
- // of passing the "this" expression through to the output and leaving the
- // interpretation up to the run-time behavior of the generated code.
- //
- // If true, the value for "this" is nested inside something (either a function
- // or a class declaration). That means the top-level module scope "this" value
- // has been shadowed and is now inaccessible.
- is_this_nested: bool = false,
-};
-
-// Due to ES6 destructuring patterns, there are many cases where it's
-// impossible to distinguish between an array or object literal and a
-// destructuring assignment until we hit the "=" operator later on.
-// This object defers errors about being in one state or the other
-// until we discover which state we're in.
-const DeferredErrors = struct {
- // These are errors for expressions
- invalid_expr_default_value: ?logger.Range = null,
- invalid_expr_after_question: ?logger.Range = null,
- array_spread_feature: ?logger.Range = null,
-
- pub fn isEmpty(self: *DeferredErrors) bool {
- return self.invalid_expr_default_value == null and self.invalid_expr_after_question == null and self.array_spread_feature == null;
- }
-
- pub fn mergeInto(self: *DeferredErrors, to: *DeferredErrors) void {
- if (self.invalid_expr_default_value) |inv| {
- to.invalid_expr_default_value = inv;
- }
-
- if (self.invalid_expr_after_question) |inv| {
- to.invalid_expr_after_question = inv;
- }
-
- if (self.array_spread_feature) |inv| {
- to.array_spread_feature = inv;
- }
- }
-
- var None = DeferredErrors{
- .invalid_expr_default_value = null,
- .invalid_expr_after_question = null,
- .array_spread_feature = null,
- };
-};
-
-const ImportClause = struct {
- items: []js_ast.ClauseItem = &([_]js_ast.ClauseItem{}),
- is_single_line: bool = false,
-};
-
-const ModuleType = enum { esm };
-
-const PropertyOpts = struct {
- async_range: logger.Range = logger.Range.None,
- is_async: bool = false,
- is_generator: bool = false,
-
- // Class-related options
- is_static: bool = false,
- is_class: bool = false,
- class_has_extends: bool = false,
- allow_ts_decorators: bool = false,
- ts_decorators: []Expr = &[_]Expr{},
-};
-
-pub const Parser = struct {
- options: Options,
- lexer: js_lexer.Lexer,
- log: *logger.Log,
- source: logger.Source,
- define: *Define,
- allocator: *std.mem.Allocator,
- p: ?*P,
-
- pub const Options = struct {
- jsx: options.JSX,
- ts: bool = false,
- ascii_only: bool = true,
- keep_names: bool = true,
- mangle_syntax: bool = false,
- mange_identifiers: bool = false,
- omit_runtime_for_tests: bool = false,
- ignore_dce_annotations: bool = true,
- preserve_unused_imports_ts: bool = false,
- use_define_for_class_fields: bool = false,
- suppress_warnings_about_weird_code: bool = true,
- moduleType: ModuleType = ModuleType.esm,
- trim_unused_imports: bool = true,
- };
-
- pub fn parse(self: *Parser) !js_ast.Result {
- if (self.p == null) {
- self.p = try P.init(self.allocator, self.log, self.source, self.define, self.lexer, self.options);
- }
-
- var result: js_ast.Result = undefined;
-
- if (self.p) |p| {
- // Parse the file in the first pass, but do not bind symbols
- var opts = ParseStatementOptions{ .is_module_scope = true };
- debugl("<p.parseStmtsUpTo>");
- const stmts = try p.parseStmtsUpTo(js_lexer.T.t_end_of_file, &opts);
- debugl("</p.parseStmtsUpTo>");
- try p.prepareForVisitPass();
-
- // ESM is always strict mode. I don't think we need this.
- // // Strip off a leading "use strict" directive when not bundling
- // var directive = "";
-
- // Insert a variable for "import.meta" at the top of the file if it was used.
- // We don't need to worry about "use strict" directives because this only
- // happens when bundling, in which case we are flatting the module scopes of
- // all modules together anyway so such directives are meaningless.
- // if (!p.import_meta_ref.isSourceIndexNull()) {
- // // heap so it lives beyond this function call
- // var decls = try p.allocator.alloc(G.Decl, 1);
- // decls[0] = Decl{ .binding = p.b(B.Identifier{
- // .ref = p.import_meta_ref,
- // }, logger.Loc.Empty), .value = p.e(E.Object{}, logger.Loc.Empty) };
- // var importMetaStatement = p.s(S.Local{
- // .kind = .k_const,
- // .decls = decls,
- // }, logger.Loc.Empty);
- // }
-
- debugl("<p.appendPart>");
- var before = List(js_ast.Part).init(p.allocator);
- var after = List(js_ast.Part).init(p.allocator);
- var parts = List(js_ast.Part).init(p.allocator);
- try p.appendPart(&parts, stmts);
- // for (stmts) |stmt| {
- // var _stmts = ([_]Stmt{stmt});
-
- // switch (stmt.data) {
- // // Split up top-level multi-declaration variable statements
-
- // .s_local => |local| {
- // for (local.decls) |decl| {
- // var decls = try p.allocator.alloc(Decl, 1);
- // var clone = S.Local{
- // .kind = local.kind,
- // .decls = decls,
- // .is_export = local.is_export,
- // .was_ts_import_equals = local.was_ts_import_equals,
- // };
- // _stmts[0] = p.s(clone, stmt.loc);
-
- // try p.appendPart(&parts, &_stmts);
- // }
- // },
- // // Move imports (and import-like exports) to the top of the file to
- // // ensure that if they are converted to a require() call, the effects
- // // will take place before any other statements are evaluated.
- // .s_import, .s_export_from, .s_export_star => {
- // try p.appendPart(&before, &_stmts);
- // },
-
- // .s_export_equals => {
- // try p.appendPart(&after, &_stmts);
- // },
- // else => {
- // try p.appendPart(&parts, &_stmts);
- // },
- // }
- // }
- // p.popScope();
- var parts_slice: []js_ast.Part = undefined;
-
- if (before.items.len > 0 or after.items.len > 0) {
- const before_len = before.items.len;
- const after_len = after.items.len;
- const parts_len = parts.items.len;
- var _parts = try p.allocator.alloc(
- js_ast.Part,
- before_len +
- after_len +
- parts_len,
- );
- if (before_len > 0) {
- std.mem.copy(js_ast.Part, _parts, before.toOwnedSlice());
- }
- if (parts_len > 0) {
- std.mem.copy(js_ast.Part, _parts[before_len .. before_len + parts_len], parts.toOwnedSlice());
- }
-
- if (after_len > 0) {
- std.mem.copy(js_ast.Part, _parts[before_len + parts_len .. _parts.len], after.toOwnedSlice());
- }
- parts_slice = _parts;
- } else {
- after.deinit();
- before.deinit();
- parts_slice = parts.toOwnedSlice();
- }
- debugl("</p.appendPart>");
-
- // Pop the module scope to apply the "ContainsDirectEval" rules
- // p.popScope();
- debugl("<result.Ast>");
- result.ast = try p.toAST(parts_slice);
- result.ok = true;
- debugl("</result.Ast>");
-
- // result = p.toAST(parts);
- // result.source_map_comment = p.lexer.source_mapping_url;
- }
-
- return result;
- }
-
- pub fn init(transform: options.TransformOptions, log: *logger.Log, source: *logger.Source, define: *Define, allocator: *std.mem.Allocator) !Parser {
- const lexer = try js_lexer.Lexer.init(log, source, allocator);
- return Parser{
- .options = Options{
- .ts = transform.loader == .tsx or transform.loader == .ts,
- .jsx = options.JSX{
- .parse = transform.loader == .tsx or transform.loader == .jsx,
- .factory = transform.jsx_factory,
- .fragment = transform.jsx_fragment,
- },
- },
- .allocator = allocator,
- .lexer = lexer,
- .define = define,
- .source = source.*,
- .log = log,
- .p = null,
- };
- }
-};
-
-const FindLabelSymbolResult = struct { ref: Ref, is_loop: bool, found: bool = false };
-
-const FindSymbolResult = struct {
- ref: Ref,
- declare_loc: ?logger.Loc = null,
- is_inside_with_scope: bool = false,
-};
-const ExportClauseResult = struct { clauses: []js_ast.ClauseItem = &([_]js_ast.ClauseItem{}), is_single_line: bool = false };
-
-const DeferredTsDecorators = struct {
- values: []js_ast.Expr,
-
- // If this turns out to be a "declare class" statement, we need to undo the
- // scopes that were potentially pushed while parsing the decorator arguments.
- scope_index: usize,
-};
-
-const LexicalDecl = enum(u8) { forbid, allow_all, allow_fn_inside_if, allow_fn_inside_label };
-
-const ParseClassOptions = struct {
- ts_decorators: []Expr = &[_]Expr{},
- allow_ts_decorators: bool = false,
- is_type_script_declare: bool = false,
-};
-
-const ParseStatementOptions = struct {
- ts_decorators: ?DeferredTsDecorators = null,
- lexical_decl: LexicalDecl = .forbid,
- is_module_scope: bool = false,
- is_namespace_scope: bool = false,
- is_export: bool = false,
- is_name_optional: bool = false, // For "export default" pseudo-statements,
- is_typescript_declare: bool = false,
-};
-
-// P is for Parser!
-// public only because of Binding.ToExpr
-pub const P = struct {
- allocator: *std.mem.Allocator,
- options: Parser.Options,
- log: *logger.Log,
- define: *Define,
- source: logger.Source,
- lexer: js_lexer.Lexer,
- allow_in: bool = false,
- allow_private_identifiers: bool = false,
- has_top_level_return: bool = false,
- latest_return_had_semicolon: bool = false,
- has_import_meta: bool = false,
- has_es_module_syntax: bool = false,
- top_level_await_keyword: logger.Range,
- fn_or_arrow_data_parse: FnOrArrowDataParse,
- fn_or_arrow_data_visit: FnOrArrowDataVisit,
- fn_only_data_visit: FnOnlyDataVisit,
- allocated_names: List(string),
- latest_arrow_arg_loc: logger.Loc = logger.Loc.Empty,
- forbid_suffix_after_as_loc: logger.Loc = logger.Loc.Empty,
- current_scope: *js_ast.Scope = undefined,
- scopes_for_current_part: List(*js_ast.Scope),
- symbols: List(js_ast.Symbol),
- ts_use_counts: List(u32),
- exports_ref: js_ast.Ref = js_ast.Ref.None,
- require_ref: js_ast.Ref = js_ast.Ref.None,
- module_ref: js_ast.Ref = js_ast.Ref.None,
- import_meta_ref: js_ast.Ref = js_ast.Ref.None,
- promise_ref: ?js_ast.Ref = null,
-
- data: js_ast.AstData,
-
- injected_define_symbols: []js_ast.Ref,
- symbol_uses: SymbolUseMap,
- declared_symbols: List(js_ast.DeclaredSymbol),
- runtime_imports: StringRefMap,
- duplicate_case_checker: void,
- non_bmp_identifiers: StringBoolMap,
- legacy_octal_literals: void,
- // legacy_octal_literals: map[js_ast.E]logger.Range,
-
- // For strict mode handling
- hoistedRefForSloppyModeBlockFn: void,
-
- // For lowering private methods
- weak_map_ref: ?js_ast.Ref,
- weak_set_ref: ?js_ast.Ref,
- private_getters: RefRefMap,
- private_setters: RefRefMap,
-
- // These are for TypeScript
- should_fold_numeric_constants: bool = false,
- emitted_namespace_vars: RefBoolMap,
- is_exported_inside_namespace: RefRefMap,
- known_enum_values: Map(js_ast.Ref, std.StringHashMap(f64)),
- local_type_names: StringBoolMap,
-
- // This is the reference to the generated function argument for the namespace,
- // which is different than the reference to the namespace itself:
- //
- // namespace ns {
- // }
- //
- // The code above is transformed into something like this:
- //
- // var ns1;
- // (function(ns2) {
- // })(ns1 or (ns1 = {}));
- //
- // This variable is "ns2" not "ns1". It is only used during the second
- // "visit" pass.
- enclosing_namespace_arg_ref: ?js_ast.Ref = null,
-
- // Imports (both ES6 and CommonJS) are tracked at the top level
- import_records: List(ImportRecord),
- import_records_for_current_part: List(u32),
- export_star_import_records: List(u32),
-
- // These are for handling ES6 imports and exports
- es6_import_keyword: logger.Range = logger.Range.None,
- es6_export_keyword: logger.Range = logger.Range.None,
- enclosing_class_keyword: logger.Range = logger.Range.None,
- import_items_for_namespace: Map(js_ast.Ref, std.StringHashMap(js_ast.LocRef)),
- is_import_item: RefBoolMap,
- named_imports: Map(js_ast.Ref, js_ast.NamedImport),
- named_exports: std.StringHashMap(js_ast.NamedExport),
- top_level_symbol_to_parts: Map(js_ast.Ref, List(u32)),
- import_namespace_cc_map: Map(ImportNamespaceCallOrConstruct, bool),
-
- // The parser does two passes and we need to pass the scope tree information
- // from the first pass to the second pass. That's done by tracking the calls
- // to pushScopeForParsePass() and popScope() during the first pass in
- // scopesInOrder.
- //
- // Then, when the second pass calls pushScopeForVisitPass() and popScope(),
- // we consume entries from scopesInOrder and make sure they are in the same
- // order. This way the second pass can efficiently use the same scope tree
- // as the first pass without having to attach the scope tree to the AST.
- //
- // We need to split this into two passes because the pass that declares the
- // symbols must be separate from the pass that binds identifiers to declared
- // symbols to handle declaring a hoisted "var" symbol in a nested scope and
- // binding a name to it in a parent or sibling scope.
- scopes_in_order: List(ScopeOrder),
-
- // These properties are for the visit pass, which runs after the parse pass.
- // The visit pass binds identifiers to declared symbols, does constant
- // folding, substitutes compile-time variable definitions, and lowers certain
- // syntactic constructs as appropriate.
- stmt_expr_value: Expr.Data,
- call_target: Expr.Data,
- delete_target: Expr.Data,
- loop_body: Stmt.Data,
- module_scope: *js_ast.Scope = undefined,
- is_control_flow_dead: bool = false,
-
- // Inside a TypeScript namespace, an "export declare" statement can be used
- // to cause a namespace to be emitted even though it has no other observable
- // effect. This flag is used to implement this feature.
- //
- // Specifically, namespaces should be generated for all of the following
- // namespaces below except for "f", which should not be generated:
- //
- // namespace a { export declare const a }
- // namespace b { export declare let [[b]] }
- // namespace c { export declare function c() }
- // namespace d { export declare class d {} }
- // namespace e { export declare enum e {} }
- // namespace f { export declare namespace f {} }
- //
- // The TypeScript compiler compiles this into the following code (notice "f"
- // is missing):
- //
- // var a; (function (a_1) {})(a or (a = {}));
- // var b; (function (b_1) {})(b or (b = {}));
- // var c; (function (c_1) {})(c or (c = {}));
- // var d; (function (d_1) {})(d or (d = {}));
- // var e; (function (e_1) {})(e or (e = {}));
- //
- // Note that this should not be implemented by declaring symbols for "export
- // declare" statements because the TypeScript compiler doesn't generate any
- // code for these statements, so these statements are actually references to
- // global variables. There is one exception, which is that local variables
- // *should* be declared as symbols because they are replaced with. This seems
- // like very arbitrary behavior but it's what the TypeScript compiler does,
- // so we try to match it.
- //
- // Specifically, in the following code below "a" and "b" should be declared
- // and should be substituted with "ns.a" and "ns.b" but the other symbols
- // shouldn't. References to the other symbols actually refer to global
- // variables instead of to symbols that are exported from the namespace.
- // This is the case as of TypeScript 4.3. I assume this is a TypeScript bug:
- //
- // namespace ns {
- // export declare const a
- // export declare let [[b]]
- // export declare function c()
- // export declare class d { }
- // export declare enum e { }
- // console.log(a, b, c, d, e)
- // }
- //
- // The TypeScript compiler compiles this into the following code:
- //
- // var ns;
- // (function (ns) {
- // console.log(ns.a, ns.b, c, d, e);
- // })(ns or (ns = {}));
- //
- // Relevant issue: https://github.com/evanw/esbuild/issues/1158
- has_non_local_export_declare_inside_namespace: bool = false,
-
- // This helps recognize the "await import()" pattern. When this is present,
- // warnings about non-string import paths will be omitted inside try blocks.
- await_target: ?js_ast.Expr.Data = null,
-
- to_expr_wrapper_namespace: Binding2ExprWrapper.Namespace,
- to_expr_wrapper_hoisted: Binding2ExprWrapper.Hoisted,
-
- // This helps recognize the "import().catch()" pattern. We also try to avoid
- // warning about this just like the "try { await import() }" pattern.
- then_catch_chain: ThenCatchChain,
-
- // Temporary variables used for lowering
- temp_refs_to_declare: List(TempRef),
- temp_ref_count: i32 = 0,
-
- // When bundling, hoisted top-level local variables declared with "var" in
- // nested scopes are moved up to be declared in the top-level scope instead.
- // The old "var" statements are turned into regular assignments instead. This
- // makes it easier to quickly scan the top-level statements for "var" locals
- // with the guarantee that all will be found.
- relocated_top_level_vars: List(js_ast.LocRef),
-
- // ArrowFunction is a special case in the grammar. Although it appears to be
- // a PrimaryExpression, it's actually an AssignmentExpression. This means if
- // a AssignmentExpression ends up producing an ArrowFunction then nothing can
- // come after it other than the comma operator, since the comma operator is
- // the only thing above AssignmentExpression under the Expression rule:
- //
- // AssignmentExpression:
- // ArrowFunction
- // ConditionalExpression
- // LeftHandSideExpression = AssignmentExpression
- // LeftHandSideExpression AssignmentOperator AssignmentExpression
- //
- // Expression:
- // AssignmentExpression
- // Expression , AssignmentExpression
- //
- after_arrow_body_loc: logger.Loc = logger.Loc.Empty,
- import_transposer: ImportTransposer,
- require_transposer: RequireTransposer,
- require_resolve_transposer: RequireResolveTransposer,
-
- const TransposeState = struct {
- is_await_target: bool = false,
- is_then_catch_target: bool = false,
- loc: logger.Loc,
- };
-
- pub fn transposeImport(p: *P, arg: Expr, state: anytype) Expr {
- // The argument must be a string
- if (@as(Expr.Tag, arg.data) == .e_string) {
- // Ignore calls to import() if the control flow is provably dead here.
- // We don't want to spend time scanning the required files if they will
- // never be used.
- if (p.is_control_flow_dead) {
- return p.e(E.Null{}, arg.loc);
- }
- const str = arg.data.e_string;
-
- const import_record_index = p.addImportRecord(.dynamic, arg.loc, p.lexer.utf16ToString(str.value));
- p.import_records.items[import_record_index].handles_import_errors = (state.is_await_target and p.fn_or_arrow_data_visit.try_body_count != 0) or state.is_then_catch_target;
- p.import_records_for_current_part.append(import_record_index) catch unreachable;
- return p.e(E.Import{
- .expr = arg,
- .import_record_index = @intCast(Ref.Int, import_record_index),
- // .leading_interior_comments = arg.data.e_string.
- }, state.loc);
- }
-
- // Use a debug log so people can see this if they want to
- const r = js_lexer.rangeOfIdentifier(&p.source, state.loc);
- p.log.addRangeDebug(p.source, r, "This \"import\" expression will not be bundled because the argument is not a string literal") catch unreachable;
-
- return p.e(E.Import{
- .expr = arg,
- .import_record_index = Ref.None.source_index,
- }, state.loc);
- }
-
- pub fn transposeRequireResolve(p: *P, arg: Expr, transpose_state: anytype) Expr {
- return arg;
- }
-
- pub fn transposeRequire(p: *P, arg: Expr, transpose_state: anytype) Expr {
- return arg;
- }
-
- const ImportTransposer = ExpressionTransposer(P, P.transposeImport);
- const RequireTransposer = ExpressionTransposer(P, P.transposeRequire);
- const RequireResolveTransposer = ExpressionTransposer(P, P.transposeRequireResolve);
-
- const Binding2ExprWrapper = struct {
- pub const Namespace = Binding.ToExpr(P, P.wrapIdentifierNamespace);
- pub const Hoisted = Binding.ToExpr(P, P.wrapIdentifierHoisting);
- };
-
- pub fn s(p: *P, t: anytype, loc: logger.Loc) Stmt {
- if (@typeInfo(@TypeOf(t)) == .Pointer) {
- return Stmt.init(t, loc);
- } else {
- return Stmt.alloc(p.allocator, t, loc);
- }
- }
- pub fn e(p: *P, t: anytype, loc: logger.Loc) Expr {
- if (@typeInfo(@TypeOf(t)) == .Pointer) {
- return Expr.init(t, loc);
- } else {
- return Expr.alloc(p.allocator, t, loc);
- }
- }
-
- pub fn b(p: *P, t: anytype, loc: logger.Loc) Binding {
- if (@typeInfo(@TypeOf(t)) == .Pointer) {
- return Binding.init(t, loc);
- } else {
- return Binding.alloc(p.allocator, t, loc);
- }
- }
-
- pub fn deinit(parser: *P) void {
- parser.allocated_names.deinit();
- parser.scopes_for_current_part.deinit();
- parser.symbols.deinit();
- parser.ts_use_counts.deinit();
- parser.declared_symbols.deinit();
- parser.known_enum_values.deinit();
- parser.import_records.deinit();
- parser.import_records_for_current_part.deinit();
- parser.export_star_import_records.deinit();
- parser.import_items_for_namespace.deinit();
- parser.named_imports.deinit();
- parser.top_level_symbol_to_parts.deinit();
- parser.import_namespace_cc_map.deinit();
- parser.scopes_in_order.deinit();
- parser.temp_refs_to_declare.deinit();
- parser.relocated_top_level_vars.deinit();
- }
-
- pub fn findSymbol(p: *P, loc: logger.Loc, name: string) !FindSymbolResult {
- var ref: Ref = undefined;
- var declare_loc: logger.Loc = undefined;
- var is_inside_with_scope = false;
- var did_forbid_argumen = false;
- var scope = p.current_scope;
-
- while (true) {
-
- // Track if we're inside a "with" statement body
- if (scope.kind == .with) {
- is_inside_with_scope = true;
- }
-
- // Forbid referencing "arguments" inside class bodies
- if (scope.forbid_arguments and strings.eql(name, "arguments") and !did_forbid_argumen) {
- const r = js_lexer.rangeOfIdentifier(&p.source, loc);
- p.log.addRangeErrorFmt(p.source, r, p.allocator, "Cannot access \"{s}\" here", .{name}) catch unreachable;
- did_forbid_argumen = true;
- }
-
- // Is the symbol a member of this scope?
- if (scope.members.get(name)) |member| {
- ref = member.ref;
- declare_loc = member.loc;
- break;
- }
-
- if (scope.parent) |parent| {
- scope = parent;
- } else {
- // Allocate an "unbound" symbol
- p.checkForNonBMPCodePoint(loc, name);
- ref = try p.newSymbol(.unbound, name);
- declare_loc = loc;
- try p.module_scope.members.put(name, js_ast.Scope.Member{ .ref = ref, .loc = logger.Loc.Empty });
- break;
- }
- }
-
- // If we had to pass through a "with" statement body to get to the symbol
- // declaration, then this reference could potentially also refer to a
- // property on the target object of the "with" statement. We must not rename
- // it or we risk changing the behavior of the code.
- if (is_inside_with_scope) {
- p.symbols.items[ref.inner_index].must_not_be_renamed = true;
- }
-
- // Track how many times we've referenced this symbol
- p.recordUsage(&ref);
- return FindSymbolResult{
- .ref = ref,
- .declare_loc = declare_loc,
- .is_inside_with_scope = is_inside_with_scope,
- };
- }
-
- pub fn recordExportedBinding(p: *P, binding: Binding) void {
- switch (binding.data) {
- .b_missing => {},
- .b_identifier => |ident| {
- p.recordExport(binding.loc, p.symbols.items[ident.ref.inner_index].original_name, ident.ref) catch unreachable;
- },
- .b_array => |array| {
- for (array.items) |prop| {
- p.recordExportedBinding(prop.binding);
- }
- },
- .b_object => |obj| {
- for (obj.properties) |prop| {
- p.recordExportedBinding(prop.value);
- }
- },
- else => {
- p.panic("Unexpected binding export type {s}", .{binding});
- },
- }
- }
-
- pub fn recordExport(p: *P, loc: logger.Loc, alias: string, ref: Ref) !void {
- if (p.named_exports.get(alias)) |name| {
- // Duplicate exports are an error
- var notes = try p.allocator.alloc(logger.Data, 1);
- notes[0] = logger.Data{
- .text = try std.fmt.allocPrint(p.allocator, "\"{s}\" was originally exported here", .{alias}),
- .location = logger.Location.init_or_nil(p.source, js_lexer.rangeOfIdentifier(&p.source, name.alias_loc)),
- };
- try p.log.addRangeErrorFmtWithNotes(
- p.source,
- js_lexer.rangeOfIdentifier(&p.source, loc),
- p.allocator,
- notes,
- "Multiple exports with the same name {s}",
- .{alias},
- );
- } else {
- try p.named_exports.put(alias, js_ast.NamedExport{ .alias_loc = loc, .ref = ref });
- }
- }
-
- pub fn recordUsage(p: *P, ref: *const js_ast.Ref) void {
- // The use count stored in the symbol is used for generating symbol names
- // during minification. These counts shouldn't include references inside dead
- // code regions since those will be culled.
- if (!p.is_control_flow_dead) {
- p.symbols.items[ref.inner_index].use_count_estimate += 1;
- var use = p.symbol_uses.get(ref.*) orelse unreachable;
- use.count_estimate += 1;
- p.symbol_uses.put(ref.*, use) catch unreachable;
- }
-
- // The correctness of TypeScript-to-JavaScript conversion relies on accurate
- // symbol use counts for the whole file, including dead code regions. This is
- // tracked separately in a parser-only data structure.
- if (p.options.ts) {
- p.ts_use_counts.items[ref.inner_index] += 1;
- }
- }
-
- pub fn findSymbolHelper(self: *P, loc: logger.Loc, name: string) ?js_ast.Ref {
- if (self.findSymbol(loc, name)) |sym| {
- return sym.ref;
- }
-
- return null;
- }
-
- pub fn symbolForDefineHelper(self: *P, i: usize) ?js_ast.Ref {
- if (self.injected_define_symbols.items.len > i) {
- return self.injected_define_symbols.items[i];
- }
-
- return null;
- }
-
- pub fn logArrowArgErrors(p: *P, errors: *DeferredArrowArgErrors) void {
- if (errors.invalid_expr_await.len > 0) {
- var r = errors.invalid_expr_await;
- p.log.addRangeError(p.source, r, "Cannot use an \"await\" expression here") catch unreachable;
- }
-
- if (errors.invalid_expr_yield.len > 0) {
- var r = errors.invalid_expr_yield;
- p.log.addRangeError(p.source, r, "Cannot use a \"yield\" expression here") catch unreachable;
- }
- }
-
- pub fn keyNameForError(p: *P, key: js_ast.Expr) string {
- switch (key.data) {
- .e_string => {
- return p.lexer.raw();
- },
- .e_private_identifier => {
- return p.lexer.raw();
- // return p.loadNameFromRef()
- },
- else => {
- return "property";
- },
- }
- }
-
- pub fn canMergeSymbols(p: *P, scope: *js_ast.Scope, existing: Symbol.Kind, new: Symbol.Kind) SymbolMergeResult {
- if (existing == .unbound) {
- return .replace_with_new;
- }
-
- // In TypeScript, imports are allowed to silently collide with symbols within
- // the module. Presumably this is because the imports may be type-only:
- //
- // import {Foo} from 'bar'
- // class Foo {}
- //
- if (p.options.ts and existing == .import) {
- return .replace_with_new;
- }
-
- // "enum Foo {} enum Foo {}"
- // "namespace Foo { ... } enum Foo {}"
- if (new == .ts_enum and (existing == .ts_enum or existing == .ts_namespace)) {
- return .replace_with_new;
- }
-
- // "namespace Foo { ... } namespace Foo { ... }"
- // "function Foo() {} namespace Foo { ... }"
- // "enum Foo {} namespace Foo { ... }"
- if (new == .ts_namespace) {
- switch (existing) {
- .ts_namespace, .hoisted_function, .generator_or_async_function, .ts_enum, .class => {
- return .keep_existing;
- },
- else => {},
- }
- }
-
- // "var foo; var foo;"
- // "var foo; function foo() {}"
- // "function foo() {} var foo;"
- // "function *foo() {} function *foo() {}" but not "{ function *foo() {} function *foo() {} }"
- if (Symbol.isKindHoistedOrFunction(new) and Symbol.isKindHoistedOrFunction(existing) and (scope.kind == .entry or scope.kind == .function_body or
- (Symbol.isKindHoisted(new) and Symbol.isKindHoisted(existing))))
- {
- return .keep_existing;
- }
-
- // "get #foo() {} set #foo() {}"
- // "set #foo() {} get #foo() {}"
- if ((existing == .private_get and new == .private_set) or
- (existing == .private_set and new == .private_get))
- {
- return .become_private_get_set_pair;
- }
- if ((existing == .private_static_get and new == .private_static_set) or
- (existing == .private_static_set and new == .private_static_get))
- {
- return .become_private_static_get_set_pair;
- }
-
- // "try {} catch (e) { var e }"
- if (existing == .catch_identifier and new == .hoisted) {
- return .replace_with_new;
- }
-
- // "function() { var arguments }"
- if (existing == .arguments and new == .hoisted) {
- return .keep_existing;
- }
-
- // "function() { let arguments }"
- if (existing == .arguments and new != .hoisted) {
- return .overwrite_with_new;
- }
-
- return .forbidden;
- }
-
- pub fn handleIdentifier(p: *P, loc: logger.Loc, ident: *E.Identifier, _original_name: ?string, opts: IdentifierOpts) Expr {
- const ref = ident.ref;
-
- if ((opts.assign_target != .none or opts.is_delete_target) and p.symbols.items[ref.inner_index].kind == .import) {
- // Create an error for assigning to an import namespace
- const r = js_lexer.rangeOfIdentifier(&p.source, loc);
- p.log.addRangeErrorFmt(p.source, r, p.allocator, "Cannot assign to import \"{s}\"", .{
- p.symbols.items[ref.inner_index].original_name,
- }) catch unreachable;
- }
-
- // Substitute an EImportIdentifier now if this is an import item
- if (p.is_import_item.contains(ref)) {
- return p.e(
- E.ImportIdentifier{ .ref = ref, .was_originally_identifier = opts.was_originally_identifier },
- loc,
- );
- }
-
- // Substitute a namespace export reference now if appropriate
- if (p.options.ts) {
- if (p.is_exported_inside_namespace.get(ref)) |ns_ref| {
- const name = p.symbols.items[ref.inner_index].original_name;
-
- // If this is a known enum value, inline the value of the enum
- if (p.known_enum_values.get(ns_ref)) |enum_values| {
- if (enum_values.get(name)) |number| {
- return p.e(E.Number{ .value = number }, loc);
- }
- }
-
- // Otherwise, create a property access on the namespace
- p.recordUsage(&ns_ref);
-
- return p.e(E.Dot{ .target = p.e(E.Identifier{ .ref = ns_ref }, loc), .name = name, .name_loc = loc }, loc);
- }
- }
-
- if (_original_name) |original_name| {
- const result = p.findSymbol(loc, original_name) catch unreachable;
- ident.ref = result.ref;
- }
-
- return p.e(ident, loc);
- }
-
- pub fn prepareForVisitPass(p: *P) !void {
- try p.pushScopeForVisitPass(js_ast.Scope.Kind.entry, locModuleScope);
- p.fn_or_arrow_data_visit.is_outside_fn_or_arrow = true;
- p.module_scope = p.current_scope;
- p.has_es_module_syntax = p.es6_import_keyword.len > 0 or p.es6_export_keyword.len > 0 or p.top_level_await_keyword.len > 0;
-
- // ECMAScript modules are always interpreted as strict mode. This has to be
- // done before "hoistSymbols" because strict mode can alter hoisting (!).
- if (p.es6_import_keyword.len > 0) {
- p.module_scope.recursiveSetStrictMode(js_ast.StrictModeKind.implicit_strict_mode_import);
- } else if (p.es6_export_keyword.len > 0) {
- p.module_scope.recursiveSetStrictMode(js_ast.StrictModeKind.implicit_strict_mode_export);
- } else if (p.top_level_await_keyword.len > 0) {
- p.module_scope.recursiveSetStrictMode(js_ast.StrictModeKind.implicit_strict_mode_top_level_await);
- }
-
- p.hoistSymbols(p.module_scope);
-
- p.require_ref = try p.newSymbol(.unbound, "require");
- p.exports_ref = try p.newSymbol(.hoisted, "exports");
- p.module_ref = try p.newSymbol(.hoisted, "module");
- }
-
- pub fn hoistSymbols(p: *P, scope: *js_ast.Scope) void {
- if (!scope.kindStopsHoisting()) {
- var iter = scope.members.iterator();
- nextMember: while (iter.next()) |res| {
- var symbol = p.symbols.items[res.value.ref.inner_index];
- if (!symbol.isHoisted()) {
- continue :nextMember;
- }
- }
- }
- }
-
- pub fn unshiftScopeOrder(self: *P) !ScopeOrder {
- if (self.scopes_in_order.items.len == 0) {
- var scope = try js_ast.Scope.initPtr(self.allocator);
- return ScopeOrder{
- .scope = scope,
- .loc = logger.Loc.Empty,
- };
- } else {
- return self.scopes_in_order.orderedRemove(0);
- }
- }
-
- pub fn pushScopeForVisitPass(p: *P, kind: js_ast.Scope.Kind, loc: logger.Loc) !void {
- var order = try p.unshiftScopeOrder();
-
- // Sanity-check that the scopes generated by the first and second passes match
- if (!order.loc.eql(loc) or order.scope.kind != kind) {
- p.panic("Expected scope ({s}, {d}) in {s}, found scope ({s}, {d})", .{ kind, loc.start, p.source.path.pretty, order.scope.kind, order.loc.start });
- }
-
- p.current_scope = order.scope;
-
- try p.scopes_for_current_part.append(order.scope);
- }
-
- pub fn pushScopeForParsePass(p: *P, kind: js_ast.Scope.Kind, loc: logger.Loc) !usize {
- debugl("<pushScopeForParsePass>");
- defer debugl("</pushScopeForParsePass>");
- var scope = try Scope.initPtr(p.allocator);
- scope.kind = kind;
- scope.label_ref = null;
-
- var parent: *Scope = undefined;
-
- if (kind != .entry) {
- parent = p.current_scope;
- scope.parent = parent;
- try parent.children.append(scope);
- scope.strict_mode = parent.strict_mode;
- }
-
- p.current_scope = scope;
-
- // Enforce that scope locations are strictly increasing to help catch bugs
- // where the pushed scopes are mistmatched between the first and second passes
- if (p.scopes_in_order.items.len > 0) {
- const prev_start = p.scopes_in_order.items[p.scopes_in_order.items.len - 1].loc.start;
- if (prev_start >= loc.start) {
- p.panic("Scope location {d} must be greater than {d}", .{ loc.start, prev_start });
- }
- }
-
- // Copy down function arguments into the function body scope. That way we get
- // errors if a statement in the function body tries to re-declare any of the
- // arguments.
- if (kind == js_ast.Scope.Kind.function_body) {
- if (parent.kind != js_ast.Scope.Kind.function_args) {
- p.panic("Internal error", .{});
- }
-
- var iter = scope.parent.?.members.iterator();
- while (iter.next()) |entry| {
- // // Don't copy down the optional function expression name. Re-declaring
- // // the name of a function expression is allowed.
- const adjacent_symbols = p.symbols.items[entry.value.ref.inner_index];
- if (adjacent_symbols.kind != .hoisted_function) {
- try scope.members.put(entry.key, entry.value);
- }
- }
- }
-
- // Remember the length in case we call popAndDiscardScope() later
- const scope_index = p.scopes_in_order.items.len;
- try p.scopes_in_order.append(ScopeOrder{ .loc = loc, .scope = scope });
-
- return scope_index;
- }
-
- // Note: do not write to "p.log" in this function. Any errors due to conversion
- // from expression to binding should be written to "invalidLog" instead. That
- // way we can potentially keep this as an expression if it turns out it's not
- // needed as a binding after all.
- pub fn convertExprToBinding(p: *P, expr: ExprNodeIndex, invalid_loc: *LocList) ?Binding {
- switch (expr.data) {
- .e_missing => {
- return p.b(B.Missing{}, expr.loc);
- },
- .e_identifier => |ex| {
- return p.b(B.Identifier{ .ref = ex.ref }, expr.loc);
- },
- .e_array => |ex| {
- if (ex.comma_after_spread) |spread| {
- invalid_loc.append(spread) catch unreachable;
- }
-
- if (ex.is_parenthesized) {
- invalid_loc.append(p.source.rangeOfOperatorBefore(expr.loc, "(").loc) catch unreachable;
- }
-
- // p.markSyntaxFeature(Destructing)
- var items = List(js_ast.ArrayBinding).init(p.allocator);
- for (items.items) |item| {
- var is_spread = true;
- switch (item.default_value.?.data) {
- .e_identifier => {},
- else => {
- // nested rest binding
- // p.markSyntaxFeature(compat.NestedRestBinding, p.source.RangeOfOperatorAfter(item.Loc, "["))
- },
- }
- var _expr = expr;
- const res = p.convertExprToBindingAndInitializer(&_expr, invalid_loc, is_spread);
- assert(res.binding != null);
- items.append(js_ast.ArrayBinding{ .binding = res.binding orelse unreachable, .default_value = res.override_expr }) catch unreachable;
- }
-
- return p.b(B.Array{
- .items = items.toOwnedSlice(),
- .has_spread = ex.comma_after_spread != null,
- .is_single_line = ex.is_single_line,
- }, expr.loc);
- },
- .e_object => |ex| {
- if (ex.comma_after_spread) |sp| {
- invalid_loc.append(sp) catch unreachable;
- }
-
- if (ex.is_parenthesized) {
- invalid_loc.append(p.source.rangeOfOperatorBefore(expr.loc, "(").loc) catch unreachable;
- }
- // p.markSyntaxFeature(compat.Destructuring, p.source.RangeOfOperatorAfter(expr.Loc, "{"))
-
- var properties = List(B.Property).init(p.allocator);
- for (ex.properties) |item| {
- if (item.flags.is_method or item.kind == .get or item.kind == .set) {
- invalid_loc.append(item.key.?.loc) catch unreachable;
- continue;
- }
- var value = &(item.value orelse unreachable);
- const tup = p.convertExprToBindingAndInitializer(value, invalid_loc, false);
- const initializer = tup.expr orelse item.initializer;
-
- properties.append(B.Property{
- .flags = Flags.Property{
- .is_spread = item.kind == .spread,
- .is_computed = item.flags.is_computed,
- },
-
- .key = item.key orelse p.panic("Internal error: Expected {s} to have a key.", .{item}),
- .value = tup.binding orelse p.panic("Internal error: Expected {s} to have a binding.", .{tup}),
- .default_value = initializer,
- }) catch unreachable;
- }
-
- return p.b(B.Object{
- .properties = properties.toOwnedSlice(),
- .is_single_line = ex.is_single_line,
- }, expr.loc);
- },
- else => {
- invalid_loc.append(expr.loc) catch unreachable;
- return null;
- },
- }
-
- return null;
- }
-
- pub fn convertExprToBindingAndInitializer(p: *P, expr: *ExprNodeIndex, invalid_log: *LocList, is_spread: bool) ExprBindingTuple {
- var initializer: ?ExprNodeIndex = null;
- var override: ?ExprNodeIndex = null;
- // zig syntax is sometimes painful
- switch (expr.*.data) {
- .e_binary => |bin| {
- if (bin.op == .bin_assign) {
- initializer = bin.right;
- override = bin.left;
- }
- },
- else => {},
- }
-
- var bind = p.convertExprToBinding(expr.*, invalid_log);
- if (initializer) |initial| {
- const equalsRange = p.source.rangeOfOperatorBefore(initial.loc, "=");
- if (is_spread) {
- p.log.addRangeError(p.source, equalsRange, "A rest argument cannot have a default initializer") catch unreachable;
- } else {
- // p.markSyntaxFeature();
- }
- }
-
- return ExprBindingTuple{ .binding = bind, .expr = initializer };
- }
-
- pub fn forbidLexicalDecl(p: *P, loc: logger.Loc) !void {
- try p.log.addRangeError(p.source, p.lexer.range(), "Cannot use a declaration in a single-statement context");
- }
-
- pub fn logExprErrors(p: *P, errors: *DeferredErrors) void {
- if (errors.invalid_expr_default_value) |r| {
- p.log.addRangeError(
- p.source,
- r,
- "Unexpected \"=\"",
- ) catch unreachable;
- }
-
- if (errors.invalid_expr_after_question) |r| {
- p.log.addRangeErrorFmt(p.source, r, p.allocator, "Unexpected {s}", .{p.source.contents[r.loc.i()..r.endI()]}) catch unreachable;
- }
-
- // if (errors.array_spread_feature) |err| {
- // p.markSyntaxFeature(compat.ArraySpread, errors.arraySpreadFeature)
- // }
- }
-
- // This assumes the "function" token has already been parsed
-
- pub fn parseFnStmt(p: *P, loc: logger.Loc, opts: *ParseStatementOptions, asyncRange: ?logger.Range) !Stmt {
- const isGenerator = p.lexer.token == T.t_asterisk;
- const isAsync = asyncRange != null;
-
- // if isGenerator {
- // p.markSyntaxFeature(compat.Generator, p.lexer.Range())
- // p.lexer.Next()
- // } else if isAsync {
- // p.markLoweredSyntaxFeature(compat.AsyncAwait, asyncRange, compat.Generator)
- // }
-
- switch (opts.lexical_decl) {
- .forbid => {
- try p.forbidLexicalDecl(loc);
- },
-
- // Allow certain function statements in certain single-statement contexts
- .allow_fn_inside_if, .allow_fn_inside_label => {
- if (opts.is_typescript_declare or isGenerator or isAsync) {
- try p.forbidLexicalDecl(loc);
- }
- },
- else => {},
- }
-
- var name: ?js_ast.LocRef = null;
- var nameText: string = undefined;
-
- // The name is optional for "export default function() {}" pseudo-statements
- if (!opts.is_name_optional or p.lexer.token == T.t_identifier) {
- var nameLoc = p.lexer.loc();
- nameText = p.lexer.identifier;
- p.lexer.expect(T.t_identifier);
- // Difference
- const ref = try p.newSymbol(Symbol.Kind.other, nameText);
- name = js_ast.LocRef{
- .loc = nameLoc,
- .ref = ref,
- };
- }
-
- // Even anonymous functions can have TypeScript type parameters
- if (p.options.ts) {
- p.skipTypescriptTypeParameters();
- }
-
- // Introduce a fake block scope for function declarations inside if statements
- var ifStmtScopeIndex: usize = 0;
- var hasIfScope = opts.lexical_decl == .allow_fn_inside_if;
- if (hasIfScope) {
- ifStmtScopeIndex = try p.pushScopeForParsePass(js_ast.Scope.Kind.block, loc);
- }
-
- var scopeIndex = try p.pushScopeForParsePass(js_ast.Scope.Kind.function_args, p.lexer.loc());
- var func = p.parseFn(name, FnOrArrowDataParse{
- .async_range = asyncRange,
- .allow_await = if (isAsync) AwaitOrYield.allow_expr else AwaitOrYield.allow_ident,
- .allow_yield = if (isGenerator) AwaitOrYield.allow_expr else AwaitOrYield.allow_ident,
- .is_typescript_declare = opts.is_typescript_declare,
-
- // Only allow omitting the body if we're parsing TypeScript
- .allow_missing_body_for_type_script = p.options.ts,
- });
-
- // Don't output anything if it's just a forward declaration of a function
- if (opts.is_typescript_declare or func.body == null) {
- p.popAndDiscardScope(scopeIndex);
-
- // Balance the fake block scope introduced above
- if (hasIfScope) {
- p.popScope();
- }
-
- if (opts.is_typescript_declare and opts.is_namespace_scope and opts.is_export) {
- p.has_non_local_export_declare_inside_namespace = true;
- }
-
- return p.s(S.TypeScript{}, loc);
- }
-
- p.popScope();
-
- // Only declare the function after we know if it had a body or not. Otherwise
- // TypeScript code such as this will double-declare the symbol:
- //
- // function foo(): void;
- // function foo(): void {}
- //
- if (name) |*name_| {
- const kind = if (isGenerator or isAsync) Symbol.Kind.generator_or_async_function else Symbol.Kind.hoisted_function;
- name_.ref = try p.declareSymbol(kind, name_.loc, nameText);
- }
- func.name = name;
-
- func.flags.has_if_scope = hasIfScope;
-
- func.flags.is_export = opts.is_export;
-
- // Balance the fake block scope introduced above
- if (hasIfScope) {
- p.popScope();
- }
-
- return p.s(S.Function{
- .func = func,
- }, func.open_parens_loc);
- }
-
- pub fn popAndDiscardScope(p: *P, scope_index: usize) void {
- // Move up to the parent scope
- var to_discard = p.current_scope;
- var parent = to_discard.parent orelse unreachable;
-
- p.current_scope = parent;
-
- // Truncate the scope order where we started to pretend we never saw this scope
- p.scopes_in_order.shrinkRetainingCapacity(scope_index);
-
- var children = parent.children;
- // Remove the last child from the parent scope
- var last = children.items.len - 1;
- if (children.items[last] != to_discard) {
- p.panic("Internal error", .{});
- }
-
- _ = children.popOrNull();
- }
-
- pub fn parseFn(p: *P, name: ?js_ast.LocRef, opts: FnOrArrowDataParse) G.Fn {
- // if data.allowAwait and data.allowYield {
- // p.markSyntaxFeature(compat.AsyncGenerator, data.asyncRange)
- // }
-
- var func = G.Fn{
- .name = name,
- .flags = Flags.Function{
- .has_rest_arg = false,
- .is_async = opts.allow_await == .allow_expr,
- .is_generator = opts.allow_yield == .allow_expr,
- },
-
- .arguments_ref = null,
- .open_parens_loc = p.lexer.loc(),
- };
- p.lexer.expect(T.t_open_paren);
-
- // Await and yield are not allowed in function arguments
- var old_fn_or_arrow_data = opts;
- p.fn_or_arrow_data_parse.allow_await = if (opts.allow_await == .allow_expr) AwaitOrYield.forbid_all else AwaitOrYield.allow_ident;
- p.fn_or_arrow_data_parse.allow_yield = if (opts.allow_yield == .allow_expr) AwaitOrYield.forbid_all else AwaitOrYield.allow_ident;
-
- // If "super()" is allowed in the body, it's allowed in the arguments
- p.fn_or_arrow_data_parse.allow_super_call = opts.allow_super_call;
- var args = List(G.Arg).init(p.allocator);
- while (p.lexer.token != T.t_close_paren) {
- // Skip over "this" type annotations
- if (p.options.ts and p.lexer.token == T.t_this) {
- p.lexer.next();
- if (p.lexer.token == T.t_colon) {
- p.lexer.next();
- p.skipTypescriptType(js_ast.Op.Level.lowest);
- }
- if (p.lexer.token != T.t_comma) {
- break;
- }
-
- p.lexer.next();
- continue;
- }
-
- var ts_decorators: []ExprNodeIndex = undefined;
- if (opts.allow_ts_decorators) {
- ts_decorators = p.parseTypeScriptDecorators();
- }
-
- if (!func.flags.has_rest_arg and p.lexer.token == T.t_dot_dot_dot) {
- // p.markSyntaxFeature
- p.lexer.next();
- func.flags.has_rest_arg = true;
- }
-
- var is_typescript_ctor_field = false;
- var is_identifier = p.lexer.token == T.t_identifier;
- var text = p.lexer.identifier;
- var arg = p.parseBinding();
-
- if (p.options.ts and is_identifier and opts.is_constructor) {
- // Skip over TypeScript accessibility modifiers, which turn this argument
- // into a class field when used inside a class constructor. This is known
- // as a "parameter property" in TypeScript.
- while (true) {
- switch (p.lexer.token) {
- .t_identifier, .t_open_brace, .t_open_bracket => {
- if (!js_lexer.TypeScriptAccessibilityModifier.has(p.lexer.identifier)) {
- break;
- }
-
- is_typescript_ctor_field = true;
-
- // TypeScript requires an identifier binding
- if (p.lexer.token != .t_identifier) {
- p.lexer.expect(.t_identifier);
- }
- text = p.lexer.identifier;
-
- // Re-parse the binding (the current binding is the TypeScript keyword)
- arg = p.parseBinding();
- },
- else => {
- break;
- },
- }
- }
-
- // "function foo(a?) {}"
- if (p.lexer.token == .t_question) {
- p.lexer.next();
- }
-
- // "function foo(a: any) {}"
- if (p.lexer.token == .t_colon) {
- p.lexer.next();
- p.skipTypescriptType(.lowest);
- }
- }
-
- var parseStmtOpts = ParseStatementOptions{};
- p.declareBinding(.hoisted, arg, &parseStmtOpts) catch unreachable;
-
- var default_value: Expr = undefined;
- if (!func.flags.has_rest_arg and p.lexer.token == .t_equals) {
- // p.markSyntaxFeature
- p.lexer.next();
- default_value = p.parseExpr(.comma);
- }
-
- args.append(G.Arg{
- .ts_decorators = ts_decorators,
- .binding = arg,
- .default = default_value,
-
- // We need to track this because it affects code generation
- .is_typescript_ctor_field = is_typescript_ctor_field,
- }) catch unreachable;
-
- if (p.lexer.token != .t_comma) {
- break;
- }
-
- if (func.flags.has_rest_arg) {
- // JavaScript does not allow a comma after a rest argument
- if (opts.is_typescript_declare) {
- // TypeScript does allow a comma after a rest argument in a "declare" context
- p.lexer.next();
- } else {
- p.lexer.expect(.t_close_paren);
- }
-
- break;
- }
-
- p.lexer.next();
- }
-
- // Reserve the special name "arguments" in this scope. This ensures that it
- // shadows any variable called "arguments" in any parent scopes. But only do
- // this if it wasn't already declared above because arguments are allowed to
- // be called "arguments", in which case the real "arguments" is inaccessible.
- if (!p.current_scope.members.contains("arguments")) {
- func.arguments_ref = p.declareSymbol(.arguments, func.open_parens_loc, "arguments") catch unreachable;
- p.symbols.items[func.arguments_ref.?.inner_index].must_not_be_renamed = true;
- }
-
- p.lexer.expect(.t_close_paren);
- p.fn_or_arrow_data_parse = old_fn_or_arrow_data;
-
- // "function foo(): any {}"
- if (p.options.ts and p.lexer.token == .t_colon) {
- p.lexer.next();
- p.skipTypescriptReturnType();
- }
-
- // "function foo(): any;"
- if (opts.allow_missing_body_for_type_script and p.lexer.token != .t_open_brace) {
- p.lexer.expectOrInsertSemicolon();
- return func;
- }
- var tempOpts = opts;
- func.body = p.parseFnBody(&tempOpts) catch unreachable;
-
- return func;
- }
-
- // pub fn parseBinding(p: *P)
-
- // TODO:
- pub fn skipTypescriptReturnType(p: *P) void {
- notimpl();
- }
-
- // TODO:
- pub fn parseTypeScriptDecorators(p: *P) []ExprNodeIndex {
- if (!p.options.ts) {
- return &([_]ExprNodeIndex{});
- }
-
- var decorators = List(ExprNodeIndex).init(p.allocator);
- while (p.lexer.token == T.t_at) {
- p.lexer.next();
-
- // Parse a new/call expression with "exprFlagTSDecorator" so we ignore
- // EIndex expressions, since they may be part of a computed property:
- //
- // class Foo {
- // @foo ['computed']() {}
- // }
- //
- // This matches the behavior of the TypeScript compiler.
- decorators.append(p.parseExprWithFlags(.new, Expr.EFlags.ts_decorator)) catch unreachable;
- }
-
- return decorators.toOwnedSlice();
- }
-
- // TODO:
- pub fn skipTypescriptType(p: *P, level: js_ast.Op.Level) void {
- notimpl();
- }
-
- // TODO:
- pub fn skipTypescriptTypeParameters(p: *P) void {
- notimpl();
- }
-
- fn createDefaultName(p: *P, loc: logger.Loc) !js_ast.LocRef {
- var identifier = try std.fmt.allocPrint(p.allocator, "{s}_default", .{p.source.identifier_name});
-
- const name = js_ast.LocRef{ .loc = loc, .ref = try p.newSymbol(Symbol.Kind.other, identifier) };
-
- var scope = p.current_scope;
-
- try scope.generated.append(name.ref orelse unreachable);
-
- return name;
- }
-
- pub fn newSymbol(p: *P, kind: Symbol.Kind, identifier: string) !js_ast.Ref {
- const ref = js_ast.Ref{
- .source_index = @intCast(Ref.Int, p.source.index),
- .inner_index = @intCast(Ref.Int, p.symbols.items.len),
- };
- try p.symbols.append(Symbol{
- .kind = kind,
- .original_name = identifier,
- .link = null,
- });
-
- if (p.options.ts) {
- try p.ts_use_counts.append(0);
- }
-
- return ref;
- }
-
- pub fn parseLabelName(p: *P) !?js_ast.LocRef {
- if (p.lexer.token != .t_identifier or p.lexer.has_newline_before) {
- return null;
- }
-
- const name = LocRef{ .loc = p.lexer.loc(), .ref = try p.storeNameInRef(p.lexer.identifier) };
- p.lexer.next();
- return name;
- }
-
- pub fn parseClassStmt(p: *P, loc: logger.Loc, opts: *ParseStatementOptions) Stmt {
- var name: ?js_ast.LocRef = null;
- var class_keyword = p.lexer.range();
- if (p.lexer.token == .t_class) {
- //marksyntaxfeature
- p.lexer.next();
- } else {
- p.lexer.expected(.t_class);
- }
-
- var is_identifier = p.lexer.token == .t_identifier;
- var is_strict_modereserved_word = is_identifier and js_lexer.StrictModeReservedWords.has(p.lexer.identifier);
-
- if (!opts.is_name_optional or (is_identifier and !is_strict_modereserved_word)) {
- var name_loc = p.lexer.loc();
- var name_text = p.lexer.identifier;
- if (is_strict_modereserved_word) {
- p.lexer.unexpected();
- }
-
- p.lexer.expect(.t_identifier);
- name = LocRef{ .loc = name_loc, .ref = null };
- if (!opts.is_typescript_declare) {
- (name orelse unreachable).ref = p.declareSymbol(.class, name_loc, name_text) catch unreachable;
- }
- }
-
- // Even anonymous classes can have TypeScript type parameters
- if (p.options.ts) {
- p.skipTypescriptTypeParameters();
- }
- var class_opts = ParseClassOptions{
- .allow_ts_decorators = true,
- .is_type_script_declare = opts.is_typescript_declare,
- };
- if (opts.ts_decorators) |dec| {
- class_opts.ts_decorators = dec.values;
- }
-
- var scope_index = p.pushScopeForParsePass(.class_name, loc) catch unreachable;
- var class = p.parseClass(class_keyword, name, class_opts);
-
- if (opts.is_typescript_declare) {
- p.popAndDiscardScope(scope_index);
- if (opts.is_namespace_scope and opts.is_export) {
- p.has_non_local_export_declare_inside_namespace = true;
- }
-
- return p.s(S.TypeScript{}, loc);
- }
-
- p.popScope();
- return p.s(S.Class{
- .class = class,
- .is_export = opts.is_export,
- }, loc);
- }
-
- pub fn parseStmt(p: *P, opts: *ParseStatementOptions) !Stmt {
- var loc = p.lexer.loc();
-
- switch (p.lexer.token) {
- .t_semicolon => {
- p.lexer.next();
- return Stmt.empty();
- },
-
- .t_export => {
- var previousExportKeyword = p.es6_export_keyword;
- if (opts.is_module_scope) {
- p.es6_export_keyword = p.lexer.range();
- } else if (!opts.is_namespace_scope) {
- p.lexer.unexpected();
- }
- p.lexer.next();
-
- // TypeScript decorators only work on class declarations
- // "@decorator export class Foo {}"
- // "@decorator export abstract class Foo {}"
- // "@decorator export default class Foo {}"
- // "@decorator export default abstract class Foo {}"
- // "@decorator export declare class Foo {}"
- // "@decorator export declare abstract class Foo {}"
- if (opts.ts_decorators != null and p.lexer.token != js_lexer.T.t_class and p.lexer.token != js_lexer.T.t_default and !p.lexer.isContextualKeyword("abstract") and !p.lexer.isContextualKeyword("declare")) {
- p.lexer.expected(js_lexer.T.t_class);
- }
-
- switch (p.lexer.token) {
- T.t_class, T.t_const, T.t_function, T.t_var => {
- opts.is_export = true;
- return p.parseStmt(opts);
- },
-
- T.t_import => {
- // "export import foo = bar"
- if (p.options.ts and (opts.is_module_scope or opts.is_namespace_scope)) {
- opts.is_export = true;
- return p.parseStmt(opts);
- }
-
- p.lexer.unexpected();
- },
-
- T.t_enum => {
- if (!p.options.ts) {
- p.lexer.unexpected();
- }
-
- opts.is_export = true;
- return p.parseStmt(opts);
- },
-
- T.t_identifier => {
- if (p.lexer.isContextualKeyword("let")) {
- opts.is_export = true;
- return p.parseStmt(opts);
- }
-
- if (opts.is_typescript_declare and p.lexer.isContextualKeyword("as")) {
- // "export as namespace ns;"
- p.lexer.next();
- p.lexer.expectContextualKeyword("namespace");
- p.lexer.expect(T.t_identifier);
- p.lexer.expectOrInsertSemicolon();
-
- return p.s(S.TypeScript{}, loc);
- }
-
- if (p.lexer.isContextualKeyword("async")) {
- var asyncRange = p.lexer.range();
- p.lexer.next();
- if (p.lexer.has_newline_before) {
- try p.log.addRangeError(p.source, asyncRange, "Unexpected newline after \"async\"");
- }
-
- p.lexer.expect(T.t_function);
- opts.is_export = true;
- return try p.parseFnStmt(loc, opts, asyncRange);
- }
-
- if (p.options.ts) {
- notimpl();
-
- // switch (p.lexer.identifier) {
- // "type" => {
- // // "export type foo = ..."
- // const typeRange = p.lexer.range();
- // if (p.lexer.has_newline_before) {
- // p.lexer.addError(p.source, typeRange.end(), "Unexpected newline after \"type\"");
- // return;
- // }
-
- // },
- // }
- }
-
- p.lexer.unexpected();
- lexerpanic();
- },
-
- T.t_default => {
- if (!opts.is_module_scope and (!opts.is_namespace_scope or !opts.is_typescript_declare)) {
- p.lexer.unexpected();
- lexerpanic();
- }
-
- var defaultLoc = p.lexer.loc();
- p.lexer.next();
-
- // TypeScript decorators only work on class declarations
- // "@decorator export default class Foo {}"
- // "@decorator export default abstract class Foo {}"
- if (opts.ts_decorators != null and p.lexer.token != T.t_class and !p.lexer.isContextualKeyword("abstract")) {
- p.lexer.expected(T.t_class);
- }
-
- if (p.lexer.isContextualKeyword("async")) {
- var async_range = p.lexer.range();
- p.lexer.next();
- var defaultName: js_ast.LocRef = undefined;
- if (p.lexer.token == T.t_function and !p.lexer.has_newline_before) {
- p.lexer.next();
- var stmtOpts = ParseStatementOptions{
- .is_name_optional = true,
- .lexical_decl = .allow_all,
- };
- var stmt = try p.parseFnStmt(loc, &stmtOpts, async_range);
- if (@as(Stmt.Tag, stmt.data) == .s_type_script) {
- // This was just a type annotation
- return stmt;
- }
-
- if (stmt.data.s_function.func.name) |name| {
- defaultName = js_ast.LocRef{ .loc = defaultLoc, .ref = name.ref };
- } else {
- defaultName = try p.createDefaultName(defaultLoc);
- }
- // this is probably a panic
- var value = js_ast.StmtOrExpr{ .stmt = stmt };
- return p.s(S.ExportDefault{ .default_name = defaultName, .value = value }, loc);
- }
-
- defaultName = try createDefaultName(p, loc);
-
- var expr = p.parseSuffix(try p.parseAsyncPrefixExpr(async_range, Level.comma), Level.comma, null, Expr.EFlags.none);
- p.lexer.expectOrInsertSemicolon();
- // this is probably a panic
- var value = js_ast.StmtOrExpr{ .expr = expr };
- return p.s(S.ExportDefault{ .default_name = defaultName, .value = value }, loc);
- }
-
- if (p.lexer.token == .t_function or p.lexer.token == .t_class or p.lexer.isContextualKeyword("interface")) {
- var _opts = ParseStatementOptions{
- .ts_decorators = opts.ts_decorators,
- .is_name_optional = true,
- .lexical_decl = .allow_all,
- };
- var stmt = p.parseStmt(&_opts) catch unreachable;
-
- var default_name: js_ast.LocRef = undefined;
-
- switch (stmt.data) {
- // This was just a type annotation
- .s_type_script => {
- return stmt;
- },
-
- .s_function => |func_container| {
- if (func_container.func.name) |name| {
- default_name = LocRef{ .loc = defaultLoc, .ref = name.ref };
- } else {}
- },
- .s_class => |class| {
- if (class.class.class_name) |name| {
- default_name = LocRef{ .loc = defaultLoc, .ref = name.ref };
- } else {}
- },
- else => {
- p.panic("Internal error: unexpected stmt {s}", .{stmt});
- },
- }
-
- return p.s(
- S.ExportDefault{ .default_name = default_name, .value = js_ast.StmtOrExpr{ .stmt = stmt } },
- loc,
- );
- }
-
- const is_identifier = p.lexer.token == .t_identifier;
- const name = p.lexer.identifier;
- var expr = p.parseExpr(.comma);
-
- // Handle the default export of an abstract class in TypeScript
- if (p.options.ts and is_identifier and (p.lexer.token == .t_class or opts.ts_decorators != null) and strings.eql(name, "abstract")) {
- switch (expr.data) {
- .e_identifier => |ident| {
- var stmtOpts = ParseStatementOptions{
- .ts_decorators = opts.ts_decorators,
- .is_name_optional = true,
- };
- const stmt: Stmt = p.parseClassStmt(loc, &stmtOpts);
-
- // Use the statement name if present, since it's a better name
- var default_name: LocRef = undefined;
- switch (stmt.data) {
- .s_class => |class| {
- var ref: Ref = undefined;
- var picked = false;
- if (class.class.class_name) |loc_ref| {
- if (loc_ref.ref) |_ref| {
- ref = _ref;
- picked = true;
- }
- }
-
- if (!picked) {
- ref = (createDefaultName(p, defaultLoc) catch unreachable).ref orelse unreachable;
- }
- default_name = LocRef{ .loc = defaultLoc, .ref = ref };
- },
- else => {
- default_name = createDefaultName(p, defaultLoc) catch unreachable;
- },
- }
-
- return p.s(S.ExportDefault{ .default_name = default_name, .value = js_ast.StmtOrExpr{ .stmt = stmt } }, loc);
- },
- else => {
- p.panic("internal error: unexpected", .{});
- },
- }
- }
-
- p.lexer.expectOrInsertSemicolon();
- return p.s(S.ExportDefault{ .default_name = createDefaultName(p, loc) catch unreachable, .value = js_ast.StmtOrExpr{ .expr = expr } }, loc);
- },
- T.t_asterisk => {
- if (!opts.is_module_scope and !(opts.is_namespace_scope or !opts.is_typescript_declare)) {
- p.lexer.unexpected();
- }
-
- p.lexer.next();
- var namespace_ref: js_ast.Ref = undefined;
- var alias: ?js_ast.G.ExportStarAlias = null;
- var path_loc: logger.Loc = undefined;
- var path_text: string = undefined;
-
- if (p.lexer.isContextualKeyword("as")) {
- // "export * as ns from 'path'"
- const name = p.lexer.identifier;
- namespace_ref = p.storeNameInRef(name) catch unreachable;
- alias = G.ExportStarAlias{ .loc = p.lexer.loc(), .original_name = name };
- if (!p.lexer.isIdentifierOrKeyword()) {
- p.lexer.expect(.t_identifier);
- }
- p.checkForNonBMPCodePoint((alias orelse unreachable).loc, name);
- p.lexer.next();
- p.lexer.expectContextualKeyword("from");
- const parsedPath = p.parsePath();
- path_loc = parsedPath.loc;
- path_text = parsedPath.text;
- } else {
- // "export * from 'path'"
- p.lexer.expectContextualKeyword("from");
- const parsedPath = p.parsePath();
- path_loc = parsedPath.loc;
- path_text = parsedPath.text;
- var path_name = fs.PathName.init(strings.append(p.allocator, path_text, "_star") catch unreachable);
- namespace_ref = p.storeNameInRef(path_name.nonUniqueNameString(p.allocator) catch unreachable) catch unreachable;
- }
-
- var import_record_index = p.addImportRecord(ImportKind.stmt, path_loc, path_text);
- p.lexer.expectOrInsertSemicolon();
- return p.s(S.ExportStar{
- .namespace_ref = namespace_ref,
- .alias = alias,
- .import_record_index = import_record_index,
- }, loc);
- },
- T.t_open_brace => {
- if (!opts.is_module_scope and !(opts.is_namespace_scope or !opts.is_typescript_declare)) {
- p.lexer.unexpected();
- }
-
- const export_clause = try p.parseExportClause();
- if (p.lexer.isContextualKeyword("from")) {
- p.lexer.expectContextualKeyword("from");
- const parsedPath = p.parsePath();
- const import_record_index = p.addImportRecord(.stmt, parsedPath.loc, parsedPath.text);
- var path_name = fs.PathName.init(strings.append(p.allocator, "import_", parsedPath.text) catch unreachable);
- const namespace_ref = p.storeNameInRef(path_name.nonUniqueNameString(p.allocator) catch unreachable) catch unreachable;
- p.lexer.expectOrInsertSemicolon();
- return p.s(S.ExportFrom{ .items = export_clause.clauses, .is_single_line = export_clause.is_single_line, .namespace_ref = namespace_ref, .import_record_index = import_record_index }, loc);
- }
- p.lexer.expectOrInsertSemicolon();
- return p.s(S.ExportClause{ .items = export_clause.clauses, .is_single_line = export_clause.is_single_line }, loc);
- },
- T.t_equals => {
- // "export = value;"
-
- p.es6_export_keyword = previousExportKeyword; // This wasn't an ESM export statement after all
- if (p.options.ts) {
- p.lexer.next();
- var value = p.parseExpr(.lowest);
- p.lexer.expectOrInsertSemicolon();
- return p.s(S.ExportEquals{ .value = value }, loc);
- }
- p.lexer.unexpected();
- return Stmt.empty();
- },
- else => {
- p.lexer.unexpected();
- return Stmt.empty();
- },
- }
- },
-
- .t_function => {
- p.lexer.next();
- return p.parseFnStmt(loc, opts, null);
- },
- .t_enum => {
- if (!p.options.ts) {
- p.lexer.unexpected();
- }
- return p.parseTypescriptEnumStmt(loc, opts);
- },
- .t_at => {
- // Parse decorators before class statements, which are potentially exported
- if (p.options.ts) {
- const scope_index = p.scopes_in_order.items.len;
- const ts_decorators = p.parseTypeScriptDecorators();
-
- // If this turns out to be a "declare class" statement, we need to undo the
- // scopes that were potentially pushed while parsing the decorator arguments.
- // That can look like any one of the following:
- //
- // "@decorator declare class Foo {}"
- // "@decorator declare abstract class Foo {}"
- // "@decorator export declare class Foo {}"
- // "@decorator export declare abstract class Foo {}"
- //
- opts.ts_decorators = DeferredTsDecorators{
- .values = ts_decorators,
- .scope_index = scope_index,
- };
-
- // "@decorator class Foo {}"
- // "@decorator abstract class Foo {}"
- // "@decorator declare class Foo {}"
- // "@decorator declare abstract class Foo {}"
- // "@decorator export class Foo {}"
- // "@decorator export abstract class Foo {}"
- // "@decorator export declare class Foo {}"
- // "@decorator export declare abstract class Foo {}"
- // "@decorator export default class Foo {}"
- // "@decorator export default abstract class Foo {}"
- if (p.lexer.token != .t_class and p.lexer.token != .t_export and !p.lexer.isContextualKeyword("abstract") and !p.lexer.isContextualKeyword("declare")) {
- p.lexer.expected(.t_class);
- }
-
- return p.parseStmt(opts);
- }
- // notimpl();
- },
- .t_class => {
- if (opts.lexical_decl != .allow_all) {
- try p.forbidLexicalDecl(loc);
- }
-
- return p.parseClassStmt(loc, opts);
- },
- .t_var => {
- p.lexer.next();
- const decls = p.parseAndDeclareDecls(.hoisted, opts);
- p.lexer.expectOrInsertSemicolon();
- return p.s(S.Local{ .kind = .k_var, .decls = decls, .is_export = opts.is_export }, loc);
- },
- .t_const => {
- if (opts.lexical_decl != .allow_all) {
- try p.forbidLexicalDecl(loc);
- }
- // p.markSyntaxFeature(compat.Const, p.lexer.Range())
-
- p.lexer.next();
-
- if (p.options.ts and p.lexer.token == T.t_enum) {
- return p.parseTypescriptEnumStmt(loc, opts);
- }
-
- const decls = p.parseAndDeclareDecls(.cconst, opts);
- p.lexer.expectOrInsertSemicolon();
-
- if (!opts.is_typescript_declare) {
- try p.requireInitializers(decls);
- }
-
- return p.s(S.Local{ .kind = .k_const, .decls = decls, .is_export = opts.is_export }, loc);
- },
- .t_if => {
- p.lexer.next();
- p.lexer.expect(.t_open_paren);
- const test_ = p.parseExpr(.lowest);
- p.lexer.expect(.t_close_paren);
- var stmtOpts = ParseStatementOptions{
- .lexical_decl = .allow_fn_inside_if,
- };
- const yes = p.parseStmt(&stmtOpts) catch unreachable;
- var no: ?Stmt = null;
- if (p.lexer.token == .t_else) {
- p.lexer.next();
- stmtOpts = ParseStatementOptions{
- .lexical_decl = .allow_fn_inside_if,
- };
- no = p.parseStmt(&stmtOpts) catch unreachable;
- }
-
- return p.s(S.If{
- .test_ = test_,
- .yes = yes,
- .no = no,
- }, loc);
- },
- .t_do => {
- p.lexer.next();
- var stmtOpts = ParseStatementOptions{};
- const body = p.parseStmt(&stmtOpts) catch unreachable;
- p.lexer.expect(.t_while);
- p.lexer.expect(.t_open_paren);
- const test_ = p.parseExpr(.lowest);
- p.lexer.expect(.t_close_paren);
-
- // This is a weird corner case where automatic semicolon insertion applies
- // even without a newline present
- if (p.lexer.token == .t_semicolon) {
- p.lexer.next();
- }
- return p.s(S.DoWhile{ .body = body, .test_ = test_ }, loc);
- },
- .t_while => {
- p.lexer.next();
-
- p.lexer.expect(.t_open_paren);
- const test_ = p.parseExpr(.lowest);
- const body_loc = p.lexer.loc();
- p.lexer.expect(.t_close_paren);
-
- var stmtOpts = ParseStatementOptions{};
-
- // Push a scope so we make sure to prevent any bare identifiers referenced
- // within the body from being renamed. Renaming them might change the
- // semantics of the code.
- _ = try p.pushScopeForParsePass(.with, body_loc);
- const body = p.parseStmt(&stmtOpts) catch unreachable;
- p.popScope();
-
- return p.s(S.With{ .body = body, .value = test_, .body_loc = body_loc }, loc);
- },
- .t_with => {
- p.lexer.next();
- p.lexer.expect(.t_open_paren);
- const test_ = p.parseExpr(.lowest);
- const body_loc = p.lexer.loc();
- p.lexer.expect(.t_close_paren);
- },
- .t_switch => {
- p.lexer.next();
-
- p.lexer.expect(.t_open_paren);
- const test_ = p.parseExpr(.lowest);
- p.lexer.expect(.t_close_paren);
-
- const body_loc = p.lexer.loc();
- _ = try p.pushScopeForParsePass(.block, body_loc);
- defer p.popScope();
-
- p.lexer.expect(.t_open_brace);
- var cases = List(js_ast.Case).init(p.allocator);
- var foundDefault = false;
- var stmtOpts = ParseStatementOptions{ .lexical_decl = .allow_all };
- var value: ?js_ast.Expr = null;
- while (p.lexer.token != .t_close_brace) {
- var body = List(js_ast.Stmt).init(p.allocator);
- value = null;
- if (p.lexer.token == .t_default) {
- if (foundDefault) {
- try p.log.addRangeError(p.source, p.lexer.range(), "Multiple default clauses are not allowed");
- fail();
- }
-
- foundDefault = true;
- p.lexer.next();
- p.lexer.expect(.t_colon);
- } else {
- p.lexer.expect(.t_case);
- value = p.parseExpr(.lowest);
- p.lexer.expect(.t_colon);
- }
-
- caseBody: while (true) {
- switch (p.lexer.token) {
- .t_close_brace, .t_case, .t_default => {
- break :caseBody;
- },
- else => {
- stmtOpts = ParseStatementOptions{ .lexical_decl = .allow_all };
- try body.append(p.parseStmt(&stmtOpts) catch unreachable);
- },
- }
- }
- try cases.append(js_ast.Case{ .value = value, .body = body.toOwnedSlice(), .loc = logger.Loc.Empty });
- }
- p.lexer.expect(.t_close_brace);
- return p.s(S.Switch{ .test_ = test_, .body_loc = body_loc, .cases = cases.toOwnedSlice() }, loc);
- },
- .t_try => {
- p.lexer.next();
- const body_loc = p.lexer.loc();
- p.lexer.expect(.t_open_brace);
- _ = try p.pushScopeForParsePass(.block, loc);
- var stmtOpts = ParseStatementOptions{};
- const body = p.parseStmtsUpTo(.t_close_brace, &stmtOpts) catch unreachable;
- p.popScope();
- p.lexer.next();
-
- var catch_: ?js_ast.Catch = null;
- var finally: ?js_ast.Finally = null;
-
- if (p.lexer.token == .t_catch) {
- const catch_loc = p.lexer.loc();
- _ = try p.pushScopeForParsePass(.block, catch_loc);
- p.lexer.next();
- var binding: ?js_ast.Binding = null;
-
- // The catch binding is optional, and can be omitted
- // jarred: TIL!
- if (p.lexer.token != .t_open_brace) {
- p.lexer.expect(.t_open_paren);
- const value = p.parseBinding();
-
- // Skip over types
- if (p.options.ts and p.lexer.token == .t_colon) {
- p.lexer.expect(.t_colon);
- p.skipTypescriptType(.lowest);
- }
-
- p.lexer.expect(.t_close_paren);
-
- // Bare identifiers are a special case
- var kind = Symbol.Kind.other;
- switch (value.data) {
- .b_identifier => {
- kind = .catch_identifier;
- },
- else => {},
- }
- stmtOpts = ParseStatementOptions{};
- try p.declareBinding(kind, value, &stmtOpts);
- }
-
- p.lexer.expect(.t_open_brace);
- stmtOpts = ParseStatementOptions{};
- const stmts = p.parseStmtsUpTo(.t_close_brace, &stmtOpts) catch unreachable;
- p.lexer.next();
- catch_ = js_ast.Catch{
- .loc = catch_loc,
- .binding = binding,
- .body = stmts,
- };
- p.popScope();
- }
-
- if (p.lexer.token == .t_finally or catch_ == null) {
- const finally_loc = p.lexer.loc();
- _ = try p.pushScopeForParsePass(.block, finally_loc);
- p.lexer.expect(.t_finally);
- p.lexer.expect(.t_open_brace);
- stmtOpts = ParseStatementOptions{};
- const stmts = p.parseStmtsUpTo(.t_close_brace, &stmtOpts) catch unreachable;
- p.lexer.next();
- finally = js_ast.Finally{ .loc = finally_loc, .stmts = stmts };
- p.popScope();
- }
-
- return p.s(
- S.Try{ .body_loc = body_loc, .body = body, .catch_ = catch_, .finally = finally },
- loc,
- );
- },
- .t_for => {
- _ = try p.pushScopeForParsePass(.block, loc);
- defer p.popScope();
-
- p.lexer.next();
-
- // "for await (let x of y) {}"
- var isForAwait = p.lexer.isContextualKeyword("await");
- if (isForAwait) {
- const await_range = p.lexer.range();
- if (p.fn_or_arrow_data_parse.allow_await != .allow_expr) {
- try p.log.addRangeError(p.source, await_range, "Cannot use \"await\" outside an async function");
- isForAwait = false;
- } else {
- // TODO: improve error handling here
- // didGenerateError := p.markSyntaxFeature(compat.ForAwait, awaitRange)
- if (p.fn_or_arrow_data_parse.is_top_level) {
- p.top_level_await_keyword = await_range;
- // p.markSyntaxFeature(compat.TopLevelAwait, awaitRange)
- }
- }
- p.lexer.next();
- }
-
- p.lexer.expect(.t_open_paren);
-
- var init_: ?Stmt = null;
- var test_: ?Expr = null;
- var update: ?Expr = null;
-
- // "in" expressions aren't allowed here
- p.allow_in = false;
-
- var bad_let_range: ?logger.Range = null;
- if (p.lexer.isContextualKeyword("let")) {
- bad_let_range = p.lexer.range();
- }
-
- var decls: []G.Decl = &([_]G.Decl{});
- var init_loc = p.lexer.loc();
- var is_var = false;
- switch (p.lexer.token) {
- // for (var )
- .t_var => {
- is_var = true;
- p.lexer.next();
- var stmtOpts = ParseStatementOptions{};
- decls = p.parseAndDeclareDecls(.hoisted, &stmtOpts);
- init_ = p.s(S.Local{ .kind = .k_const, .decls = decls }, init_loc);
- },
- // for (const )
- .t_const => {
- p.lexer.next();
- var stmtOpts = ParseStatementOptions{};
- decls = p.parseAndDeclareDecls(.cconst, &stmtOpts);
- init_ = p.s(S.Local{ .kind = .k_const, .decls = decls }, init_loc);
- },
- // for (;)
- .t_semicolon => {},
- else => {
- var stmtOpts = ParseStatementOptions{ .lexical_decl = .allow_all };
-
- const res = try p.parseExprOrLetStmt(&stmtOpts);
- switch (res.stmt_or_expr) {
- .stmt => |stmt| {
- bad_let_range = null;
- init_ = stmt;
- },
- .expr => |expr| {
- init_ = p.s(S.SExpr{
- .value = expr,
- }, init_loc);
- },
- }
- },
- }
-
- // "in" expressions are allowed again
- p.allow_in = true;
-
- // Detect for-of loops
- if (p.lexer.isContextualKeyword("of") or isForAwait) {
- if (bad_let_range) |r| {
- try p.log.addRangeError(p.source, r, "\"let\" must be wrapped in parentheses to be used as an expression here");
- fail();
- }
-
- if (isForAwait and !p.lexer.isContextualKeyword("of")) {
- if (init_) |init_stmt| {
- p.lexer.expectedString("\"of\"");
- } else {
- p.lexer.unexpected();
- }
- }
-
- try p.forbidInitializers(decls, "of", false);
- p.lexer.next();
- const value = p.parseExpr(.comma);
- p.lexer.expect(.t_close_paren);
- var stmtOpts = ParseStatementOptions{};
- const body = p.parseStmt(&stmtOpts) catch unreachable;
- return p.s(S.ForOf{ .is_await = isForAwait, .init = init_ orelse unreachable, .value = value, .body = body }, loc);
- }
-
- // Detect for-in loops
- if (p.lexer.token == .t_in) {
- try p.forbidInitializers(decls, "in", false);
- p.lexer.next();
- const value = p.parseExpr(.comma);
- p.lexer.expect(.t_close_paren);
- var stmtOpts = ParseStatementOptions{};
- const body = p.parseStmt(&stmtOpts) catch unreachable;
- return p.s(S.ForIn{ .init = init_ orelse unreachable, .value = value, .body = body }, loc);
- }
-
- // Only require "const" statement initializers when we know we're a normal for loop
- if (init_) |init_stmt| {
- switch (init_stmt.data) {
- .s_local => |local| {
- if (local.kind == .k_const) {
- try p.requireInitializers(decls);
- }
- },
- else => {},
- }
- }
-
- p.lexer.expect(.t_semicolon);
- if (p.lexer.token != .t_semicolon) {
- test_ = p.parseExpr(.lowest);
- }
-
- p.lexer.expect(.t_semicolon);
-
- if (p.lexer.token != .t_close_paren) {
- update = p.parseExpr(.lowest);
- }
-
- p.lexer.expect(.t_close_paren);
- var stmtOpts = ParseStatementOptions{};
- const body = p.parseStmt(&stmtOpts) catch unreachable;
- return p.s(
- S.For{ .init = init_, .test_ = test_, .update = update, .body = body },
- loc,
- );
- },
- .t_import => {
- const previous_import_keyword = p.es6_import_keyword;
- p.es6_import_keyword = p.lexer.range();
- p.lexer.next();
- var stmt: S.Import = S.Import{
- .namespace_ref = undefined,
- .import_record_index = std.math.maxInt(u32),
- };
- var was_originally_bare_import = false;
-
- // "export import foo = bar"
- if ((opts.is_export or (opts.is_namespace_scope and !opts.is_typescript_declare)) and p.lexer.token != .t_identifier) {
- p.lexer.expected(.t_identifier);
- }
-
- switch (p.lexer.token) {
- // "import('path')"
- // "import.meta"
- .t_open_paren, .t_dot => {
- p.es6_import_keyword = previous_import_keyword; // this wasn't an esm import statement after all
- const expr = p.parseSuffix(p.parseImportExpr(loc, .lowest), .lowest, null, Expr.EFlags.none);
- p.lexer.expectOrInsertSemicolon();
- return p.s(S.SExpr{
- .value = expr,
- }, loc);
- },
- .t_string_literal, .t_no_substitution_template_literal => {
- // "import 'path'"
- if (!opts.is_module_scope and (!opts.is_namespace_scope or !opts.is_typescript_declare)) {
- p.lexer.unexpected();
- fail();
- }
- was_originally_bare_import = true;
- },
- .t_asterisk => {
- // "import * as ns from 'path'"
- if (!opts.is_module_scope and (!opts.is_namespace_scope or !opts.is_typescript_declare)) {
- p.lexer.unexpected();
- fail();
- }
-
- p.lexer.next();
- p.lexer.expectContextualKeyword("as");
- stmt = S.Import{
- .namespace_ref = try p.storeNameInRef(p.lexer.identifier),
- .star_name_loc = p.lexer.loc(),
- .import_record_index = std.math.maxInt(u32),
- };
- p.lexer.expect(.t_identifier);
- p.lexer.expectContextualKeyword("from");
- },
- .t_open_brace => {
- // "import {item1, item2} from 'path'"
- if (!opts.is_module_scope and (!opts.is_namespace_scope or !opts.is_typescript_declare)) {
- p.lexer.unexpected();
- fail();
- }
- var importClause = try p.parseImportClause();
- stmt = S.Import{
- .namespace_ref = undefined,
- .import_record_index = std.math.maxInt(u32),
- .items = importClause.items,
- .is_single_line = importClause.is_single_line,
- };
- p.lexer.expectContextualKeyword("from");
- },
- .t_identifier => {
- // "import defaultItem from 'path'"
- // "import foo = bar"
- if (!opts.is_module_scope and (!opts.is_namespace_scope)) {
- p.lexer.unexpected();
- fail();
- }
-
- const default_name = p.lexer.identifier;
- stmt = S.Import{ .namespace_ref = undefined, .import_record_index = std.math.maxInt(u32), .default_name = LocRef{
- .loc = p.lexer.loc(),
- .ref = try p.storeNameInRef(default_name),
- } };
- p.lexer.next();
-
- if (p.options.ts) {
- // Skip over type-only imports
- if (strings.eql(default_name, "type")) {
- switch (p.lexer.token) {
- .t_identifier => {
- if (!strings.eql(p.lexer.identifier, "from")) {
- // "import type foo from 'bar';"
- p.lexer.next();
- p.lexer.expectContextualKeyword("from");
- _ = p.parsePath();
- p.lexer.expectOrInsertSemicolon();
- return p.s(S.TypeScript{}, loc);
- }
- },
- .t_asterisk => {
- // "import type * as foo from 'bar';"
- p.lexer.next();
- p.lexer.expectContextualKeyword("as");
- p.lexer.expect(.t_identifier);
- p.lexer.expectContextualKeyword("from");
- _ = p.parsePath();
- p.lexer.expectOrInsertSemicolon();
- return p.s(S.TypeScript{}, loc);
- },
-
- .t_open_brace => {
- // "import type {foo} from 'bar';"
- _ = try p.parseImportClause();
- p.lexer.expectContextualKeyword("from");
- _ = p.parsePath();
- p.lexer.expectOrInsertSemicolon();
- return p.s(S.TypeScript{}, loc);
- },
- else => {},
- }
- }
-
- // Parse TypeScript import assignment statements
- p.es6_import_keyword = previous_import_keyword; // This wasn't an ESM import statement after all;
- return p.parseTypeScriptImportEqualsStmt(loc, opts, logger.Loc.Empty, default_name);
- }
-
- if (p.lexer.token == .t_comma) {
- p.lexer.next();
-
- switch (p.lexer.token) {
- // "import defaultItem, * as ns from 'path'"
- .t_asterisk => {
- p.lexer.next();
- p.lexer.expectContextualKeyword("as");
- stmt.namespace_ref = try p.storeNameInRef(p.lexer.identifier);
- stmt.star_name_loc = p.lexer.loc();
- p.lexer.expect(.t_identifier);
- },
- // "import defaultItem, {item1, item2} from 'path'"
- .t_open_brace => {
- const importClause = try p.parseImportClause();
- stmt.items = importClause.items;
- stmt.is_single_line = importClause.is_single_line;
- },
- else => {
- p.lexer.unexpected();
- },
- }
- }
-
- p.lexer.expectContextualKeyword("from");
- },
- else => {
- p.lexer.unexpected();
- fail();
- },
- }
-
- const path = p.parsePath();
- stmt.import_record_index = p.addImportRecord(.stmt, path.loc, path.text);
- p.import_records.items[stmt.import_record_index].was_originally_bare_import = was_originally_bare_import;
- p.lexer.expectOrInsertSemicolon();
-
- if (stmt.star_name_loc) |star| {
- stmt.namespace_ref = try p.declareSymbol(.import, star, p.loadNameFromRef(stmt.namespace_ref));
- } else {
- var path_name = fs.PathName.init(strings.append(p.allocator, "import_", path.text) catch unreachable);
- const name = try path_name.nonUniqueNameString(p.allocator);
- stmt.namespace_ref = try p.newSymbol(.other, name);
- var scope: *Scope = p.current_scope;
- try scope.generated.append(stmt.namespace_ref);
- }
-
- var item_refs = std.StringHashMap(LocRef).init(p.allocator);
-
- // Link the default item to the namespace
- if (stmt.default_name) |*name_loc| {
- const name = p.loadNameFromRef(name_loc.ref orelse unreachable);
- const ref = try p.declareSymbol(.import, name_loc.loc, name);
- try p.is_import_item.put(ref, true);
- name_loc.ref = ref;
- }
-
- if (stmt.items.len > 0) {
- try item_refs.ensureCapacity(@intCast(u32, stmt.items.len));
- for (stmt.items) |*item| {
- const name = p.loadNameFromRef(item.name.ref orelse unreachable);
- const ref = try p.declareSymbol(.import, item.name.loc, name);
- p.checkForNonBMPCodePoint(item.alias_loc, item.alias);
- try p.is_import_item.put(ref, true);
- item.name.ref = ref;
- item_refs.putAssumeCapacity(item.alias, LocRef{ .loc = item.name.loc, .ref = ref });
- }
- }
-
- // Track the items for this namespace
- try p.import_items_for_namespace.put(stmt.namespace_ref, item_refs);
- return p.s(stmt, loc);
- },
- .t_break => {
- p.lexer.next();
- const name = try p.parseLabelName();
- p.lexer.expectOrInsertSemicolon();
- return p.s(S.Break{ .label = name }, loc);
- },
- .t_continue => {
- p.lexer.next();
- const name = try p.parseLabelName();
- p.lexer.expectOrInsertSemicolon();
- return p.s(S.Continue{ .label = name }, loc);
- },
- .t_return => {
- p.lexer.next();
- var value: ?Expr = null;
- if ((p.lexer.token != .t_semicolon and
- !p.lexer.has_newline_before and
- p.lexer.token != .t_close_brace and
- p.lexer.token != .t_end_of_file))
- {
- value = p.parseExpr(.lowest);
- }
- p.latest_return_had_semicolon = p.lexer.token == .t_semicolon;
- p.lexer.expectOrInsertSemicolon();
-
- return p.s(S.Return{ .value = value }, loc);
- },
- .t_throw => {
- p.lexer.next();
- if (p.lexer.has_newline_before) {
- try p.log.addError(p.source, logger.Loc{
- .start = loc.start + 5,
- }, "Unexpected newline after \"throw\"");
- fail();
- }
- const expr = p.parseExpr(.lowest);
- p.lexer.expectOrInsertSemicolon();
- return p.s(S.Throw{ .value = expr }, loc);
- },
- .t_debugger => {
- p.lexer.next();
- p.lexer.expectOrInsertSemicolon();
- return p.s(S.Debugger{}, loc);
- },
- .t_open_brace => {
- _ = try p.pushScopeForParsePass(.block, loc);
- defer p.popScope();
- p.lexer.next();
- var stmtOpts = ParseStatementOptions{};
- const stmts = p.parseStmtsUpTo(.t_close_brace, &stmtOpts) catch unreachable;
- p.lexer.next();
- return p.s(S.Block{
- .stmts = stmts,
- }, loc);
- },
-
- else => {
- const is_identifier = p.lexer.token == .t_identifier;
- const name = p.lexer.identifier;
- var emiss = E.Missing{};
- // Parse either an async function, an async expression, or a normal expression
- var expr: Expr = Expr{ .loc = loc, .data = Expr.Data{ .e_missing = &emiss } };
- if (is_identifier and strings.eql(p.lexer.raw(), "async")) {
- var async_range = p.lexer.range();
- p.lexer.next();
- if (p.lexer.token == .t_function and !p.lexer.has_newline_before) {
- p.lexer.next();
- return try p.parseFnStmt(async_range.loc, opts, async_range);
- }
-
- expr = p.parseSuffix(try p.parseAsyncPrefixExpr(async_range, .lowest), .lowest, null, Expr.EFlags.none);
- } else {
- const exprOrLet = try p.parseExprOrLetStmt(opts);
- switch (exprOrLet.stmt_or_expr) {
- .stmt => |stmt| {
- p.lexer.expectOrInsertSemicolon();
- return stmt;
- },
- .expr => |_expr| {
- expr = _expr;
- },
- }
- }
-
- if (is_identifier) {
- switch (expr.data) {
- .e_identifier => |ident| {
- if (p.lexer.token == .t_colon and opts.ts_decorators == null) {
- _ = try p.pushScopeForParsePass(.label, loc);
- defer p.popScope();
-
- // Parse a labeled statement
- p.lexer.next();
-
- const _name = LocRef{ .loc = expr.loc, .ref = ident.ref };
- var nestedOpts = ParseStatementOptions{};
-
- switch (opts.lexical_decl) {
- .allow_all, .allow_fn_inside_label => {
- nestedOpts.lexical_decl = .allow_fn_inside_label;
- },
- else => {},
- }
- var stmt = p.parseStmt(&nestedOpts) catch unreachable;
- return p.s(S.Label{ .name = _name, .stmt = stmt }, loc);
- }
- },
- else => {},
- }
-
- if (p.options.ts) {
- if (js_lexer.TypescriptStmtKeyword.List.get(name)) |ts_stmt| {
- switch (ts_stmt) {
- .ts_stmt_type => {
- if (p.lexer.token == .t_identifier and !p.lexer.has_newline_before) {
- // "type Foo = any"
- var stmtOpts = ParseStatementOptions{ .is_module_scope = opts.is_module_scope };
- p.skipTypescriptTypeStmt(&stmtOpts);
- return p.s(S.TypeScript{}, loc);
- }
- },
- .ts_stmt_namespace, .ts_stmt_module => {
- // "namespace Foo {}"
- // "module Foo {}"
- // "declare module 'fs' {}"
- // "declare module 'fs';"
- if (((opts.is_module_scope or opts.is_namespace_scope) and (p.lexer.token == .t_identifier or
- (p.lexer.token == .t_string_literal and opts.is_typescript_declare))))
- {
- return p.parseTypescriptNamespaceTmt(loc, opts);
- }
- },
- .ts_stmt_interface => {
- // "interface Foo {}"
- var stmtOpts = ParseStatementOptions{ .is_module_scope = opts.is_module_scope };
-
- p.skipTypeScriptInterfaceStmt(&stmtOpts);
- return p.s(S.TypeScript{}, loc);
- },
- .ts_stmt_abstract => {
- if (p.lexer.token == .t_class or opts.ts_decorators != null) {
- return p.parseClassStmt(loc, opts);
- }
- },
- .ts_stmt_global => {
- // "declare module 'fs' { global { namespace NodeJS {} } }"
- if (opts.is_namespace_scope and opts.is_typescript_declare and p.lexer.token == .t_open_brace) {
- p.lexer.next();
- _ = p.parseStmtsUpTo(.t_close_brace, opts) catch unreachable;
- p.lexer.next();
- return p.s(S.TypeScript{}, loc);
- }
- },
- .ts_stmt_declare => {
- opts.lexical_decl = .allow_all;
- opts.is_typescript_declare = true;
-
- // "@decorator declare class Foo {}"
- // "@decorator declare abstract class Foo {}"
- if (opts.ts_decorators != null and p.lexer.token != .t_class and !p.lexer.isContextualKeyword("abstract")) {
- p.lexer.expected(.t_class);
- }
-
- // "declare global { ... }"
- if (p.lexer.isContextualKeyword("global")) {
- p.lexer.next();
- p.lexer.expect(.t_open_brace);
- _ = p.parseStmtsUpTo(.t_close_brace, opts) catch unreachable;
- p.lexer.next();
- return p.s(S.TypeScript{}, loc);
- }
-
- // "declare const x: any"
- const stmt = p.parseStmt(opts) catch unreachable;
- if (opts.ts_decorators) |decs| {
- p.discardScopesUpTo(decs.scope_index);
- }
-
- // Unlike almost all uses of "declare", statements that use
- // "export declare" with "var/let/const" inside a namespace affect
- // code generation. They cause any declared bindings to be
- // considered exports of the namespace. Identifier references to
- // those names must be converted into property accesses off the
- // namespace object:
- //
- // namespace ns {
- // export declare const x
- // export function y() { return x }
- // }
- //
- // (ns as any).x = 1
- // console.log(ns.y())
- //
- // In this example, "return x" must be replaced with "return ns.x".
- // This is handled by replacing each "export declare" statement
- // inside a namespace with an "export var" statement containing all
- // of the declared bindings. That "export var" statement will later
- // cause identifiers to be transformed into property accesses.
- if (opts.is_namespace_scope and opts.is_export) {
- var decls: []G.Decl = &([_]G.Decl{});
- switch (stmt.data) {
- .s_local => |local| {
- var _decls = try List(G.Decl).initCapacity(p.allocator, local.decls.len);
- for (local.decls) |decl| {
- try extractDeclsForBinding(decl.binding, &_decls);
- }
- decls = _decls.toOwnedSlice();
- },
- else => {},
- }
-
- if (decls.len > 0) {
- return p.s(S.Local{
- .kind = .k_var,
- .is_export = true,
- .decls = decls,
- }, loc);
- }
- }
-
- return p.s(S.TypeScript{}, loc);
- },
- }
- }
- }
- }
-
- p.lexer.expectOrInsertSemicolon();
- return p.s(S.SExpr{ .value = expr }, loc);
- },
- }
-
- return js_ast.Stmt.empty();
- }
-
- pub fn discardScopesUpTo(p: *P, scope_index: usize) void {
- // Remove any direct children from their parent
- var scope = p.current_scope;
- var children = scope.children;
- for (p.scopes_in_order.items[scope_index..]) |child| {
- if (child.scope.parent == p.current_scope) {
- var i: usize = children.items.len - 1;
- while (i >= 0) {
- if (children.items[i] == child.scope) {
- _ = children.orderedRemove(i);
- break;
- }
- i -= 1;
- }
- }
- }
-
- // Truncate the scope order where we started to pretend we never saw this scope
- p.scopes_in_order.shrinkAndFree(scope_index);
- }
-
- pub fn skipTypescriptTypeStmt(p: *P, opts: *ParseStatementOptions) void {
- notimpl();
- }
-
- pub fn parseTypescriptNamespaceTmt(p: *P, loc: logger.Loc, opts: *ParseStatementOptions) Stmt {
- notimpl();
- }
-
- pub fn skipTypeScriptInterfaceStmt(p: *P, opts: *ParseStatementOptions) void {
- notimpl();
- }
-
- pub fn parseTypeScriptImportEqualsStmt(p: *P, loc: logger.Loc, opts: *ParseStatementOptions, default_name_loc: logger.Loc, default_name: string) Stmt {
- notimpl();
- }
-
- pub fn parseClauseAlias(p: *P, kind: string) !string {
- const loc = p.lexer.loc();
-
- // The alias may now be a string (see https://github.com/tc39/ecma262/pull/2154)
- if (p.lexer.token == .t_string_literal) {
- if (p.lexer.utf16ToStringWithValidation(p.lexer.string_literal)) |alias| {
- return alias;
- } else |err| {
- const r = p.source.rangeOfString(loc);
- // TODO: improve error message
- try p.log.addRangeErrorFmt(p.source, r, p.allocator, "Invalid {s} alias because it contains an unpaired Unicode surrogate (like emoji)", .{kind});
- return p.source.textForRange(r);
- }
- }
-
- // The alias may be a keyword
- if (!p.lexer.isIdentifierOrKeyword()) {
- p.lexer.expect(.t_identifier);
- }
-
- const alias = p.lexer.identifier;
- p.checkForNonBMPCodePoint(loc, alias);
- return alias;
- }
-
- pub fn parseImportClause(
- p: *P,
- ) !ImportClause {
- var items = List(js_ast.ClauseItem).init(p.allocator);
- p.lexer.expect(.t_open_brace);
- var is_single_line = !p.lexer.has_newline_before;
-
- while (p.lexer.token != .t_close_brace) {
- // The alias may be a keyword;
- const isIdentifier = p.lexer.token == .t_identifier;
- const alias_loc = p.lexer.loc();
- const alias = try p.parseClauseAlias("import");
- var name = LocRef{ .loc = alias_loc, .ref = try p.storeNameInRef(alias) };
- var original_name = alias;
- p.lexer.next();
-
- if (p.lexer.isContextualKeyword("as")) {
- p.lexer.next();
- original_name = p.lexer.identifier;
- name = LocRef{ .loc = alias_loc, .ref = try p.storeNameInRef(alias) };
- p.lexer.expect(.t_identifier);
- } else if (!isIdentifier) {
- // An import where the name is a keyword must have an alias
- p.lexer.expectedString("\"as\"");
- }
-
- // Reject forbidden names
- if (isEvalOrArguments(original_name)) {
- const r = js_lexer.rangeOfIdentifier(&p.source, name.loc);
- try p.log.addRangeErrorFmt(p.source, r, p.allocator, "Cannot use \"{s}\" as an identifier here", .{original_name});
- }
-
- try items.append(js_ast.ClauseItem{
- .alias = alias,
- .alias_loc = alias_loc,
- .name = name,
- .original_name = original_name,
- });
-
- if (p.lexer.token != .t_comma) {
- break;
- }
-
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
-
- p.lexer.next();
-
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
- }
-
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
-
- p.lexer.expect(.t_close_brace);
- return ImportClause{ .items = items.toOwnedSlice(), .is_single_line = is_single_line };
- }
-
- pub fn forbidInitializers(p: *P, decls: []G.Decl, loop_type: string, is_var: bool) !void {
- if (decls.len > 1) {
- try p.log.addErrorFmt(p.source, decls[0].binding.loc, p.allocator, "for-{s} loops must have a single declaration", .{loop_type});
- } else if (decls.len == 1) {
- if (decls[0].value) |value| {
- if (is_var) {
-
- // This is a weird special case. Initializers are allowed in "var"
- // statements with identifier bindings.
- return;
- }
-
- try p.log.addErrorFmt(p.source, value.loc, p.allocator, "for-{s} loop variables cannot have an initializer", .{loop_type});
- }
- }
- }
-
- pub fn parseExprOrLetStmt(p: *P, opts: *ParseStatementOptions) !ExprOrLetStmt {
- var let_range = p.lexer.range();
- var raw = p.lexer.raw();
-
- if (p.lexer.token != .t_identifier or !strings.eql(raw, "let")) {
- return ExprOrLetStmt{ .stmt_or_expr = js_ast.StmtOrExpr{ .expr = p.parseExpr(.lowest) } };
- }
-
- p.lexer.next();
-
- switch (p.lexer.token) {
- .t_identifier, .t_open_bracket, .t_open_brace => {
- if (opts.lexical_decl == .allow_all or !p.lexer.has_newline_before or p.lexer.token == .t_open_bracket) {
- if (opts.lexical_decl != .allow_all) {
- try p.forbidLexicalDecl(let_range.loc);
- }
-
- const decls = p.parseAndDeclareDecls(.other, opts);
- return ExprOrLetStmt{
- .stmt_or_expr = js_ast.StmtOrExpr{
- .stmt = p.s(S.Local{
- .kind = .k_let,
- .decls = decls,
- .is_export = opts.is_export,
- }, let_range.loc),
- },
- .decls = decls,
- };
- }
- },
- else => {},
- }
-
- const ref = p.storeNameInRef(raw) catch unreachable;
- const expr = p.e(E.Identifier{ .ref = ref }, let_range.loc);
- return ExprOrLetStmt{ .stmt_or_expr = js_ast.StmtOrExpr{ .expr = p.parseExpr(.lowest) } };
- }
-
- pub fn requireInitializers(p: *P, decls: []G.Decl) !void {
- for (decls) |decl| {
- if (decl.value == null) {
- switch (decl.binding.data) {
- .b_identifier => |ident| {
- const r = js_lexer.rangeOfIdentifier(&p.source, decl.binding.loc);
- try p.log.addRangeErrorFmt(p.source, r, p.allocator, "The constant \"{s}\" must be initialized", .{p.symbols.items[ident.ref.inner_index].original_name});
- // return;/
- },
- else => {
- try p.log.addError(p.source, decl.binding.loc, "This constant must be initialized");
- },
- }
- }
- }
- }
-
- pub fn parseBinding(p: *P) Binding {
- var loc = p.lexer.loc();
-
- switch (p.lexer.token) {
- .t_identifier => {
- const name = p.lexer.identifier;
- if ((p.fn_or_arrow_data_parse.allow_await != .allow_ident and strings.eql(name, "await")) or (p.fn_or_arrow_data_parse.allow_yield != .allow_ident and strings.eql(name, "yield"))) {
- // TODO: add fmt to addRangeError
- p.log.addRangeError(p.source, p.lexer.range(), "Cannot use \"yield\" or \"await\" here.") catch unreachable;
- }
-
- const ref = p.storeNameInRef(name) catch unreachable;
- p.lexer.next();
- return p.b(B.Identifier{ .ref = ref }, loc);
- },
- .t_open_bracket => {
- p.lexer.next();
- var is_single_line = !p.lexer.has_newline_before;
- var items = List(js_ast.ArrayBinding).init(p.allocator);
- var has_spread = false;
-
- // "in" expressions are allowed
- var old_allow_in = p.allow_in;
- p.allow_in = true;
- while (p.lexer.token != .t_close_bracket) {
- if (p.lexer.token == .t_comma) {
- items.append(js_ast.ArrayBinding{
- .binding = p.b(
- B.Missing{},
- p.lexer.loc(),
- ),
- }) catch unreachable;
- } else {
- if (p.lexer.token == .t_dot_dot_dot) {
- p.lexer.next();
- has_spread = true;
-
- // This was a bug in the ES2015 spec that was fixed in ES2016
- if (p.lexer.token != .t_identifier) {
- // p.markSyntaxFeature(compat.NestedRestBinding, p.lexer.Range())
-
- }
- }
-
- const binding = p.parseBinding();
-
- var default_value: ?Expr = null;
- if (!has_spread and p.lexer.token == .t_equals) {
- p.lexer.next();
- default_value = p.parseExpr(.comma);
- }
-
- items.append(js_ast.ArrayBinding{ .binding = binding, .default_value = default_value }) catch unreachable;
-
- // Commas after spread elements are not allowed
- if (has_spread and p.lexer.token == .t_comma) {
- p.log.addRangeError(p.source, p.lexer.range(), "Unexpected \",\" after rest pattern") catch unreachable;
- fail();
- }
- }
-
- if (p.lexer.token != .t_comma) {
- break;
- }
-
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
- p.lexer.next();
-
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
- }
- p.allow_in = old_allow_in;
-
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
- p.lexer.expect(.t_close_bracket);
- return p.b(B.Array{
- .items = items.toOwnedSlice(),
- .has_spread = has_spread,
- .is_single_line = is_single_line,
- }, loc);
- },
- .t_open_brace => {
- // p.markSyntaxFeature(compat.Destructuring, p.lexer.Range())
- p.lexer.next();
- var is_single_line = false;
- var properties = List(js_ast.B.Property).init(p.allocator);
-
- // "in" expressions are allowed
- var old_allow_in = p.allow_in;
- p.allow_in = true;
-
- while (p.lexer.token != .t_close_brace) {
- var property = p.parsePropertyBinding();
- properties.append(property) catch unreachable;
-
- // Commas after spread elements are not allowed
- if (property.flags.is_spread and p.lexer.token == .t_comma) {
- p.log.addRangeError(p.source, p.lexer.range(), "Unexpected \",\" after rest pattern") catch unreachable;
- fail();
- }
-
- if (p.lexer.token != .t_comma) {
- break;
- }
-
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
- p.lexer.next();
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
- }
-
- p.allow_in = old_allow_in;
-
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
- p.lexer.expect(.t_close_brace);
-
- return p.b(B.Object{
- .properties = properties.toOwnedSlice(),
- .is_single_line = is_single_line,
- }, loc);
- },
- else => {},
- }
-
- p.lexer.expect(.t_identifier);
- return p.b(B.Missing{}, loc);
- }
-
- pub fn parsePropertyBinding(p: *P) B.Property {
- var key: js_ast.Expr = undefined;
- var is_computed = false;
-
- switch (p.lexer.token) {
- .t_dot_dot_dot => {
- p.lexer.next();
- const value = p.b(B.Identifier{
- .ref = p.storeNameInRef(p.lexer.identifier) catch unreachable,
- }, p.lexer.loc());
- p.lexer.expect(.t_identifier);
- return B.Property{
- // This "key" diverges from esbuild, but is due to Go always having a zero value.
- .key = p.e(E.Missing{}, logger.Loc.Empty),
-
- .flags = Flags.Property{ .is_spread = true },
- .value = value,
- };
- },
- .t_numeric_literal => {
- key = p.e(E.Number{
- .value = p.lexer.number,
- }, p.lexer.loc());
- // check for legacy octal literal
- p.lexer.next();
- },
- .t_string_literal => {
- key = p.parseStringLiteral();
- },
- .t_big_integer_literal => {
- key = p.e(E.BigInt{
- .value = p.lexer.identifier,
- }, p.lexer.loc());
- // p.markSyntaxFeature(compat.BigInt, p.lexer.Range())
- p.lexer.next();
- },
- .t_open_bracket => {
- is_computed = true;
- p.lexer.next();
- key = p.parseExpr(.comma);
- p.lexer.expect(.t_close_bracket);
- },
- else => {
- const name = p.lexer.identifier;
- const loc = p.lexer.loc();
-
- if (!p.lexer.isIdentifierOrKeyword()) {
- p.lexer.expect(.t_identifier);
- }
-
- p.lexer.next();
-
- key = p.e(E.String{
- .value = p.lexer.stringToUTF16(name),
- }, loc);
-
- if (p.lexer.token != .t_colon and p.lexer.token != .t_open_paren) {
- const ref = p.storeNameInRef(name) catch unreachable;
- const value = p.b(B.Identifier{ .ref = ref }, loc);
- var default_value: ?Expr = null;
- if (p.lexer.token == .t_equals) {
- p.lexer.next();
- default_value = p.parseExpr(.comma);
- }
-
- return B.Property{
- .key = key,
- .value = value,
- .default_value = default_value,
- };
- }
- },
- }
-
- p.lexer.expect(.t_colon);
- const value = p.parseBinding();
-
- var default_value: ?Expr = null;
- if (p.lexer.token == .t_equals) {
- p.lexer.next();
- default_value = p.parseExpr(.comma);
- }
-
- return B.Property{
- .flags = Flags.Property{
- .is_computed = is_computed,
- },
- .key = key,
- .value = value,
- .default_value = default_value,
- };
- }
-
- pub fn parseAndDeclareDecls(p: *P, kind: Symbol.Kind, opts: *ParseStatementOptions) []G.Decl {
- var decls = List(G.Decl).initCapacity(p.allocator, 1) catch unreachable;
-
- while (true) {
- // Forbid "let let" and "const let" but not "var let"
- if ((kind == .other or kind == .cconst) and p.lexer.isContextualKeyword("let")) {
- p.log.addRangeError(p.source, p.lexer.range(), "Cannot use \"let\" as an identifier here") catch unreachable;
- }
-
- var value: ?js_ast.Expr = null;
- var local = p.parseBinding();
- p.declareBinding(kind, local, opts) catch unreachable;
-
- // Skip over types
- if (p.options.ts) {
- // "let foo!"
- var is_definite_assignment_assertion = p.lexer.token == .t_exclamation;
- if (is_definite_assignment_assertion) {
- p.lexer.next();
- }
-
- // "let foo: number"
- if (is_definite_assignment_assertion or p.lexer.token == .t_colon) {
- p.lexer.expect(.t_colon);
- p.skipTypescriptType(.lowest);
- }
- }
-
- if (p.lexer.token == .t_equals) {
- p.lexer.next();
- value = p.parseExpr(.comma);
- }
-
- decls.append(G.Decl{
- .binding = local,
- .value = value,
- }) catch unreachable;
-
- if (p.lexer.token != .t_comma) {
- break;
- }
- p.lexer.next();
- }
-
- return decls.toOwnedSlice();
- }
-
- pub fn parseTypescriptEnumStmt(p: *P, loc: logger.Loc, opts: *ParseStatementOptions) Stmt {
- notimpl();
- // return Stmt.empty();
- }
-
- pub fn parseExportClause(p: *P) !ExportClauseResult {
- var items = List(js_ast.ClauseItem).initCapacity(p.allocator, 1) catch unreachable;
- var first_keyword_item_loc = logger.Loc{};
- p.lexer.expect(.t_open_brace);
- var is_single_line = !p.lexer.has_newline_before;
-
- while (p.lexer.token != .t_close_brace) {
- var alias = try p.parseClauseAlias("export");
- var alias_loc = p.lexer.loc();
-
- var name = LocRef{
- .loc = alias_loc,
- .ref = p.storeNameInRef(alias) catch unreachable,
- };
- var original_name = alias;
-
- // The name can actually be a keyword if we're really an "export from"
- // statement. However, we won't know until later. Allow keywords as
- // identifiers for now and throw an error later if there's no "from".
- //
- // // This is fine
- // export { default } from 'path'
- //
- // // This is a syntax error
- // export { default }
- //
- if (p.lexer.token != .t_identifier) {
- if (!p.lexer.isIdentifierOrKeyword()) {
- p.lexer.expect(.t_identifier);
- }
- if (first_keyword_item_loc.start == 0) {
- first_keyword_item_loc = p.lexer.loc();
- }
- }
-
- p.checkForNonBMPCodePoint(alias_loc, alias);
- p.lexer.next();
-
- if (p.lexer.isContextualKeyword("as")) {
- p.lexer.next();
- alias = try p.parseClauseAlias("export");
- alias_loc = p.lexer.loc();
-
- p.lexer.next();
- }
-
- items.append(js_ast.ClauseItem{
- .alias = alias,
- .alias_loc = alias_loc,
- .name = name,
- .original_name = original_name,
- }) catch unreachable;
-
- // we're done if there's no comma
- if (p.lexer.token != .t_comma) {
- break;
- }
-
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
- p.lexer.next();
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
- }
-
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
- p.lexer.expect(.t_close_brace);
-
- // Throw an error here if we found a keyword earlier and this isn't an
- // "export from" statement after all
- if (first_keyword_item_loc.start != 0 and !p.lexer.isContextualKeyword("from")) {
- const r = js_lexer.rangeOfIdentifier(&p.source, first_keyword_item_loc);
- p.lexer.addRangeError(r, "Expected identifier but found \"{s}\"", .{p.source.textForRange(r)}, true);
- }
-
- return ExportClauseResult{
- .clauses = items.toOwnedSlice(),
- .is_single_line = is_single_line,
- };
- }
-
- pub fn parsePath(p: *P) ParsedPath {
- var path = ParsedPath{
- .loc = p.lexer.loc(),
- .text = p.lexer.utf16ToString(p.lexer.string_literal),
- };
-
- if (p.lexer.token == .t_no_substitution_template_literal) {
- p.lexer.next();
- } else {
- p.lexer.expect(.t_string_literal);
- }
-
- return path;
- }
-
- // TODO:
- pub fn checkForNonBMPCodePoint(p: *P, loc: logger.Loc, name: string) void {}
-
- pub fn parseStmtsUpTo(p: *P, eend: js_lexer.T, opts: *ParseStatementOptions) ![]Stmt {
- var stmts = try StmtList.initCapacity(p.allocator, 1);
-
- var returnWithoutSemicolonStart: i32 = -1;
- opts.lexical_decl = .allow_all;
- var isDirectivePrologue = true;
-
- run: while (true) {
- for (p.lexer.comments_to_preserve_before.items) |comment| {
- try stmts.append(p.s(S.Comment{
- .text = comment.text,
- }, p.lexer.loc()));
- }
-
- var stmt = p.parseStmt(opts) catch break :run;
-
- // Skip TypeScript types entirely
- if (p.options.ts) {
- switch (stmt.data) {
- .s_type_script => {
- continue;
- },
- else => {},
- }
- }
-
- // Parse one or more directives at the beginning
- if (isDirectivePrologue) {
- isDirectivePrologue = false;
- switch (stmt.data) {
- .s_expr => |expr| {
- switch (expr.value.data) {
- .e_string => |str| {
- if (!str.prefer_template) {
- stmt.data = Stmt.Data{
- .s_directive = p.m(S.Directive{
- .value = str.value,
- // .legacy_octal_loc = str.legacy_octal_loc,
- }),
- };
- isDirectivePrologue = true;
-
- if (strings.eqlUtf16("use strict", str.value)) {
- // Track "use strict" directives
- p.current_scope.strict_mode = .explicit_strict_mode;
- } else if (strings.eqlUtf16("use asm", str.value)) {
- stmt.data = Stmt.Data{ .s_empty = p.m(S.Empty{}) };
- }
- }
- },
- else => {},
- }
- },
- else => {},
- }
- }
-
- try stmts.append(stmt);
-
- // Warn about ASI and return statements. Here's an example of code with
- // this problem: https://github.com/rollup/rollup/issues/3729
- if (!p.options.suppress_warnings_about_weird_code) {
- var needsCheck = true;
- switch (stmt.data) {
- .s_return => |ret| {
- if (ret.value == null and !p.latest_return_had_semicolon) {
- returnWithoutSemicolonStart = stmt.loc.start;
- needsCheck = false;
- }
- },
- else => {},
- }
-
- if (needsCheck and returnWithoutSemicolonStart != -1) {
- switch (stmt.data) {
- .s_expr => |exp| {
- try p.log.addWarning(
- p.source,
- logger.Loc{ .start = returnWithoutSemicolonStart + 6 },
- "The following expression is not returned because of an automatically-inserted semicolon",
- );
- },
- else => {},
- }
-
- returnWithoutSemicolonStart = -1;
- }
- }
-
- if (p.lexer.token == eend) {
- break :run;
- }
- }
-
- return stmts.toOwnedSlice();
- }
-
- pub fn markStrictModeFeature(p: *P, feature: StrictModeFeature, r: logger.Range, detail: string) !void {
- var text: string = undefined;
- var can_be_transformed = false;
- switch (feature) {
- .with_statement => {
- text = "With statements";
- },
- .delete_bare_name => {
- text = "\"delete\" of a bare identifier";
- },
- .for_in_var_init => {
- text = "Variable initializers within for-in loops";
- can_be_transformed = true;
- },
- .eval_or_arguments => {
- text = try std.fmt.allocPrint(p.allocator, "Declarations with the name {s}", .{detail});
- },
- .reserved_word => {
- text = try std.fmt.allocPrint(p.allocator, "{s} is a reserved word and", .{detail});
- },
- .legacy_octal_literal => {
- text = "Legacy octal literals";
- },
- .legacy_octal_escape => {
- text = "Legacy octal escape sequences";
- },
- .if_else_function_stmt => {
- text = "Function declarations inside if statements";
- },
- // else => {
- // text = "This feature";
- // },
- }
-
- var scope = p.current_scope;
- if (p.isStrictMode()) {
- var why: string = "";
- var notes: []logger.Data = undefined;
- var where: logger.Range = undefined;
- switch (scope.strict_mode) {
- .implicit_strict_mode_import => {
- where = p.es6_import_keyword;
- },
- .implicit_strict_mode_export => {
- where = p.es6_export_keyword;
- },
- .implicit_strict_mode_top_level_await => {
- where = p.top_level_await_keyword;
- },
- .implicit_strict_mode_class => {
- why = "All code inside a class is implicitly in strict mode";
- where = p.enclosing_class_keyword;
- },
- else => {},
- }
- if (why.len == 0) {
- why = try std.fmt.allocPrint(p.allocator, "This file is implicitly in strict mode because of the \"{s}\" keyword here", .{p.source.textForRange(where)});
- }
-
- try p.log.addRangeErrorWithNotes(p.source, r, try std.fmt.allocPrint(p.allocator, "{s} cannot be used in strict mode", .{text}), &([_]logger.Data{logger.rangeData(p.source, where, why)}));
- } else if (!can_be_transformed and p.isStrictModeOutputFormat()) {
- try p.log.addRangeError(p.source, r, try std.fmt.allocPrint(p.allocator, "{s} cannot be used with \"esm\" due to strict mode", .{text}));
- }
- }
-
- pub fn isStrictMode(p: *P) bool {
- return p.current_scope.strict_mode != .sloppy_mode;
- }
-
- pub fn isStrictModeOutputFormat(p: *P) bool {
- return true;
- }
-
- pub fn declareSymbol(p: *P, kind: Symbol.Kind, loc: logger.Loc, name: string) !Ref {
- // p.checkForNonBMPCodePoint(loc, name)
-
- // Forbid declaring a symbol with a reserved word in strict mode
- if (p.isStrictMode() and js_lexer.StrictModeReservedWords.has(name)) {
- try p.markStrictModeFeature(.reserved_word, js_lexer.rangeOfIdentifier(&p.source, loc), name);
- }
-
- // Allocate a new symbol
- var ref = try p.newSymbol(kind, name);
-
- const scope = p.current_scope;
- if (scope.members.get(name)) |existing| {
- var symbol: Symbol = p.symbols.items[@intCast(usize, existing.ref.inner_index)];
-
- switch (p.canMergeSymbols(scope, symbol.kind, kind)) {
- .forbidden => {
- const r = js_lexer.rangeOfIdentifier(&p.source, loc);
- var notes: []logger.Data = undefined;
- notes = &([_]logger.Data{logger.rangeData(p.source, r, try std.fmt.allocPrint(p.allocator, "{s} has already been declared", .{name}))});
- try p.log.addRangeErrorWithNotes(p.source, r, try std.fmt.allocPrint(p.allocator, "{s} was originally declared here", .{name}), notes);
- return existing.ref;
- },
- .keep_existing => {
- ref = existing.ref;
- },
- .replace_with_new => {
- symbol.link = ref;
- },
- .become_private_get_set_pair => {
- ref = existing.ref;
- symbol.kind = .private_get_set_pair;
- },
- .become_private_static_get_set_pair => {
- ref = existing.ref;
- symbol.kind = .private_static_get_set_pair;
- },
-
- .overwrite_with_new => {},
- // else => unreachable,
- }
- }
-
- try scope.members.put(name, js_ast.Scope.Member{ .ref = ref, .loc = loc });
- return ref;
- }
-
- pub fn validateFunctionName(p: *P, func: G.Fn, kind: FunctionKind) void {
- if (func.name) |name| {
- const original_name = p.symbols.items[name.ref.?.inner_index].original_name;
-
- if (func.flags.is_async and strings.eql(original_name, "await")) {
- p.log.addRangeError(
- p.source,
- js_lexer.rangeOfIdentifier(&p.source, name.loc),
- "An async function cannot be named \"await\"",
- ) catch unreachable;
- } else if (kind == .expr and func.flags.is_generator and strings.eql(original_name, "yield")) {
- p.log.addRangeError(
- p.source,
- js_lexer.rangeOfIdentifier(&p.source, name.loc),
- "An generator function expression cannot be named \"yield\"",
- ) catch unreachable;
- }
- }
- }
-
- pub fn parseFnExpr(p: *P, loc: logger.Loc, is_async: bool, async_range: logger.Range) !Expr {
- p.lexer.next();
- const is_generator = p.lexer.token == T.t_asterisk;
- if (is_generator) {
- // p.markSyntaxFeature()
- p.lexer.next();
- } else if (is_async) {
- // p.markLoweredSyntaxFeature(compat.AsyncAwait, asyncRange, compat.Generator)
- }
-
- var name: ?js_ast.LocRef = null;
-
- _ = p.pushScopeForParsePass(.function_args, loc) catch unreachable;
- defer p.popScope();
-
- if (p.lexer.token == .t_identifier) {
- name = js_ast.LocRef{
- .loc = loc,
- .ref = null,
- };
-
- if (p.lexer.identifier.len > 0 and !strings.eql(p.lexer.identifier, "arguments")) {
- (name orelse unreachable).ref = try p.declareSymbol(.hoisted_function, (name orelse unreachable).loc, p.lexer.identifier);
- } else {
- (name orelse unreachable).ref = try p.newSymbol(.hoisted_function, p.lexer.identifier);
- }
- debug("FUNC NAME {s}", .{p.lexer.identifier});
- p.lexer.next();
- }
-
- if (p.options.ts) {
- p.skipTypescriptTypeParameters();
- }
-
- var func = p.parseFn(name, FnOrArrowDataParse{
- .async_range = async_range,
- .allow_await = if (is_async) .allow_expr else .allow_ident,
- .allow_yield = if (is_generator) .allow_expr else .allow_ident,
- });
-
- p.validateFunctionName(func, .expr);
-
- return p.e(js_ast.E.Function{
- .func = func,
- }, loc);
- }
-
- pub fn parseFnBody(p: *P, data: *FnOrArrowDataParse) !G.FnBody {
- var oldFnOrArrowData = p.fn_or_arrow_data_parse;
- var oldAllowIn = p.allow_in;
- p.fn_or_arrow_data_parse = data.*;
- p.allow_in = true;
-
- const loc = p.lexer.loc();
- _ = try p.pushScopeForParsePass(Scope.Kind.function_body, p.lexer.loc());
- defer p.popScope();
-
- p.lexer.expect(.t_open_brace);
- var opts = ParseStatementOptions{};
- const stmts = p.parseStmtsUpTo(.t_close_brace, &opts) catch unreachable;
- p.lexer.next();
-
- p.allow_in = oldAllowIn;
- p.fn_or_arrow_data_parse = oldFnOrArrowData;
- return G.FnBody{ .loc = loc, .stmts = stmts };
- }
-
- pub fn parseArrowBody(p: *P, args: []js_ast.G.Arg, data: *FnOrArrowDataParse) !E.Arrow {
- var arrow_loc = p.lexer.loc();
-
- // Newlines are not allowed before "=>"
- if (p.lexer.has_newline_before) {
- try p.log.addRangeError(p.source, p.lexer.range(), "Unexpected newline before \"=>\"");
- fail();
- }
-
- p.lexer.expect(T.t_equals_greater_than);
-
- for (args) |arg| {
- var opts = ParseStatementOptions{};
- try p.declareBinding(Symbol.Kind.hoisted, arg.binding, &opts);
- }
-
- data.allow_super_call = p.fn_or_arrow_data_parse.allow_super_call;
- if (p.lexer.token == .t_open_brace) {
- var body = try p.parseFnBody(data);
- p.after_arrow_body_loc = p.lexer.loc();
- return E.Arrow{ .args = args, .body = body };
- }
-
- _ = try p.pushScopeForParsePass(Scope.Kind.function_body, arrow_loc);
- defer p.popScope();
-
- var old_fn_or_arrow_data = p.fn_or_arrow_data_parse;
- p.fn_or_arrow_data_parse = data.*;
-
- var expr = p.parseExpr(Level.comma);
- p.fn_or_arrow_data_parse = old_fn_or_arrow_data;
- var stmts = try p.allocator.alloc(Stmt, 1);
- stmts[0] = p.s(S.Return{ .value = expr }, arrow_loc);
-
- return E.Arrow{ .args = args, .prefer_expr = true, .body = G.FnBody{ .loc = arrow_loc, .stmts = stmts } };
- }
-
- pub fn declareBinding(p: *P, kind: Symbol.Kind, binding: BindingNodeIndex, opts: *ParseStatementOptions) !void {
- switch (binding.data) {
- .b_missing => {},
- .b_identifier => |bind| {
- if (!opts.is_typescript_declare or (opts.is_namespace_scope and opts.is_export)) {
- bind.ref = try p.declareSymbol(kind, binding.loc, p.loadNameFromRef(bind.ref));
- }
- },
-
- .b_array => |bind| {
- for (bind.items) |item| {
- p.declareBinding(kind, item.binding, opts) catch unreachable;
- }
- },
-
- .b_object => |bind| {
- for (bind.properties) |*prop| {
- const value = prop.value;
- p.declareBinding(kind, value, opts) catch unreachable;
- }
- },
-
- else => {
- // @compileError("Missing binding type");
- },
- }
- }
-
- // Saves us from allocating a slice to the heap
- pub fn parseArrowBodySingleArg(p: *P, arg: G.Arg, data: anytype) !E.Arrow {
- switch (@TypeOf(data)) {
- FnOrArrowDataParse => {
- var args = [_]G.Arg{arg};
-
- var d = data;
-
- return p.parseArrowBody(args[0..], &d);
- },
- *FnOrArrowDataParse => {
- var args = [_]G.Arg{arg};
- return p.parseArrowBody(args[0..], data);
- },
- else => unreachable,
- }
- }
-
- // This is where the allocate memory to the heap for AST objects.
- // This is a short name to keep the code more readable.
- // It also swallows errors, but I think that's correct here.
- // We can handle errors via the log.
- // We'll have to deal with @wasmHeapGrow or whatever that thing is.
- pub fn mm(self: *P, comptime ast_object_type: type, instance: anytype) callconv(.Inline) *ast_object_type {
- var obj = self.allocator.create(ast_object_type) catch unreachable;
- obj.* = instance;
- return obj;
- }
-
- // mmmm memmory allocation
- pub fn m(self: *P, kind: anytype) callconv(.Inline) *@TypeOf(kind) {
- return self.mm(@TypeOf(kind), kind);
- }
-
- // Doing this the fast way is too complicated for now.
- pub fn storeNameInRef(p: *P, name: string) !js_ast.Ref {
- // allocated_names is lazily allocated
- if (p.allocated_names.capacity > 0) {
- const inner_index = @intCast(Ref.Int, p.allocated_names.items.len);
- try p.allocated_names.append(name);
- return js_ast.Ref{ .source_index = std.math.maxInt(Ref.Int), .inner_index = inner_index };
- } else {
- p.allocated_names = try @TypeOf(p.allocated_names).initCapacity(p.allocator, 1);
- p.allocated_names.appendAssumeCapacity(name);
- return js_ast.Ref{ .source_index = std.math.maxInt(Ref.Int), .inner_index = 0 };
- }
- }
-
- pub fn loadNameFromRef(p: *P, ref: js_ast.Ref) string {
- assert(ref.inner_index < p.allocated_names.items.len);
- return p.allocated_names.items[ref.inner_index];
- }
-
- // This parses an expression. This assumes we've already parsed the "async"
- // keyword and are currently looking at the following token.
- pub fn parseAsyncPrefixExpr(p: *P, async_range: logger.Range, level: Level) !Expr {
- // "async function() {}"
- if (!p.lexer.has_newline_before and p.lexer.token == T.t_function) {
- return try p.parseFnExpr(async_range.loc, true, async_range);
- }
-
- // Check the precedence level to avoid parsing an arrow function in
- // "new async () => {}". This also avoids parsing "new async()" as
- // "new (async())()" instead.
- if (!p.lexer.has_newline_before and level.lt(.member)) {
- switch (p.lexer.token) {
- // "async => {}"
- .t_equals_greater_than => {
- if (level.lte(.assign)) {
- const arg = G.Arg{ .binding = p.b(
- B.Identifier{
- .ref = try p.storeNameInRef("async"),
- },
- async_range.loc,
- ) };
- _ = p.pushScopeForParsePass(.function_args, async_range.loc) catch unreachable;
- defer p.popScope();
- var arrow_body = try p.parseArrowBodySingleArg(arg, FnOrArrowDataParse{});
- return p.e(arrow_body, async_range.loc);
- }
- },
- // "async x => {}"
- .t_identifier => {
- if (level.lte(.assign)) {
- // p.markLoweredSyntaxFeature();
- const ref = try p.storeNameInRef(p.lexer.identifier);
- var arg = G.Arg{ .binding = p.b(B.Identifier{
- .ref = ref,
- }, p.lexer.loc()) };
- p.lexer.next();
-
- _ = try p.pushScopeForParsePass(.function_args, async_range.loc);
- defer p.popScope();
-
- var arrowBody = try p.parseArrowBodySingleArg(arg, FnOrArrowDataParse{
- .allow_await = .allow_expr,
- });
- arrowBody.is_async = true;
- return p.e(arrowBody, async_range.loc);
- }
- },
-
- // "async()"
- // "async () => {}"
- .t_open_paren => {
- p.lexer.next();
- return p.parseParenExpr(async_range.loc, ParenExprOpts{ .is_async = true, .async_range = async_range });
- },
-
- // "async<T>()"
- // "async <T>() => {}"
- .t_less_than => {
- if (p.options.ts and p.trySkipTypeScriptTypeParametersThenOpenParenWithBacktracking()) {
- p.lexer.next();
- return p.parseParenExpr(async_range.loc, ParenExprOpts{ .is_async = true, .async_range = async_range });
- }
- },
-
- else => {},
- }
- }
-
- // "async"
- // "async + 1"
- return p.e(
- E.Identifier{ .ref = try p.storeNameInRef("async") },
- async_range.loc,
- );
- }
-
- pub fn trySkipTypeScriptTypeParametersThenOpenParenWithBacktracking(self: *P) bool {
- notimpl();
- }
-
- pub fn parseExprOrBindings(p: *P, level: Level, errors: ?*DeferredErrors) Expr {
- return p.parseExprCommon(level, errors, Expr.EFlags.none);
- }
-
- pub fn parseExpr(p: *P, level: Level) Expr {
- return p.parseExprCommon(level, null, Expr.EFlags.none);
- }
-
- pub fn parseExprWithFlags(p: *P, level: Level, flags: Expr.EFlags) Expr {
- return p.parseExprCommon(level, null, flags);
- }
-
- pub fn parseExprCommon(p: *P, level: Level, errors: ?*DeferredErrors, flags: Expr.EFlags) Expr {
- const had_pure_comment_before = p.lexer.has_pure_comment_before and !p.options.ignore_dce_annotations;
- var expr = p.parsePrefix(level, errors, flags);
-
- // There is no formal spec for "__PURE__" comments but from reverse-
- // engineering, it looks like they apply to the next CallExpression or
- // NewExpression. So in "/* @__PURE__ */ a().b() + c()" the comment applies
- // to the expression "a().b()".
-
- if (had_pure_comment_before and level.lt(.call)) {
- expr = p.parseSuffix(expr, @intToEnum(Level, @enumToInt(Level.call) - 1), errors, flags);
- switch (expr.data) {
- .e_call => |ex| {
- ex.can_be_unwrapped_if_unused = true;
- },
- .e_new => |ex| {
- ex.can_be_unwrapped_if_unused = true;
- },
- else => {},
- }
- }
-
- return p.parseSuffix(expr, level, errors, flags);
- }
-
- pub fn addImportRecord(p: *P, kind: ImportKind, loc: logger.Loc, name: string) u32 {
- var index = p.import_records.items.len;
- const record = ImportRecord{
- .kind = kind,
- .range = p.source.rangeOfString(loc),
- .path = fs.Path.init(name),
- };
- p.import_records.append(record) catch unreachable;
- return @intCast(u32, index);
- }
-
- pub fn popScope(p: *P) void {
- const current_scope = p.current_scope;
- // We cannot rename anything inside a scope containing a direct eval() call
- if (current_scope.contains_direct_eval) {
- var iter = current_scope.members.iterator();
- while (iter.next()) |member| {
-
- // Using direct eval when bundling is not a good idea in general because
- // esbuild must assume that it can potentially reach anything in any of
- // the containing scopes. We try to make it work but this isn't possible
- // in some cases.
- //
- // For example, symbols imported using an ESM import are a live binding
- // to the underlying symbol in another file. This is emulated during
- // scope hoisting by erasing the ESM import and just referencing the
- // underlying symbol in the flattened bundle directly. However, that
- // symbol may have a different name which could break uses of direct
- // eval:
- //
- // // Before bundling
- // import { foo as bar } from './foo.js'
- // console.log(eval('bar'))
- //
- // // After bundling
- // let foo = 123 // The contents of "foo.js"
- // console.log(eval('bar'))
- //
- // There really isn't any way to fix this. You can't just rename "foo" to
- // "bar" in the example above because there may be a third bundled file
- // that also contains direct eval and imports the same symbol with a
- // different conflicting import alias. And there is no way to store a
- // live binding to the underlying symbol in a variable with the import's
- // name so that direct eval can access it:
- //
- // // After bundling
- // let foo = 123 // The contents of "foo.js"
- // const bar = /* cannot express a live binding to "foo" here */
- // console.log(eval('bar'))
- //
- // Technically a "with" statement could potentially make this work (with
- // a big hit to performance), but they are deprecated and are unavailable
- // in strict mode. This is a non-starter since all ESM code is strict mode.
- //
- // So while we still try to obey the requirement that all symbol names are
- // pinned when direct eval is present, we make an exception for top-level
- // symbols in an ESM file when bundling is enabled. We make no guarantee
- // that "eval" will be able to reach these symbols and we allow them to be
- // renamed or removed by tree shaking.
- // if (p.currentScope.parent == null and p.has_es_module_syntax) {
- // continue;
- // }
-
- p.symbols.items[member.value.ref.inner_index].must_not_be_renamed = true;
- }
- }
-
- p.current_scope = current_scope.parent orelse p.panic("Internal error: attempted to call popScope() on the topmost scope", .{});
- }
-
- pub fn markExprAsParenthesized(p: *P, expr: *Expr) void {
- switch (expr.data) {
- .e_array => |ex| {
- ex.is_parenthesized = true;
- },
- .e_object => |ex| {
- ex.is_parenthesized = true;
- },
- else => {
- return;
- },
- }
- }
-
- pub fn parseYieldExpr(p: *P, loc: logger.Loc) Expr {
- // Parse a yield-from expression, which yields from an iterator
- const isStar = p.lexer.token == T.t_asterisk;
-
- if (isStar) {
- if (p.lexer.has_newline_before) {
- p.lexer.unexpected();
- }
- p.lexer.next();
- }
-
- var value: ?ExprNodeIndex = null;
- switch (p.lexer.token) {
- .t_close_brace, .t_close_paren, .t_colon, .t_comma, .t_semicolon => {},
- else => {
- if (isStar or !p.lexer.has_newline_before) {
- value = p.parseExpr(.yield);
- }
- },
- }
-
- return p.e(E.Yield{
- .value = value,
- .is_star = isStar,
- }, loc);
- }
-
- pub fn parseProperty(p: *P, kind: Property.Kind, opts: *PropertyOpts, errors: ?*DeferredErrors) ?G.Property {
- var key: Expr = undefined;
- var key_range = p.lexer.range();
- var is_computed = false;
-
- switch (p.lexer.token) {
- .t_numeric_literal => {
- key = p.e(E.Number{
- .value = p.lexer.number,
- }, p.lexer.loc());
- // p.checkForLegacyOctalLiteral()
- p.lexer.next();
- },
- .t_string_literal => {
- key = p.parseStringLiteral();
- },
- .t_big_integer_literal => {
- key = p.e(E.BigInt{ .value = p.lexer.identifier }, p.lexer.loc());
- // markSyntaxFeature
- p.lexer.next();
- },
- .t_private_identifier => {
- if (!opts.is_class or opts.ts_decorators.len > 0) {
- p.lexer.expected(.t_identifier);
- }
-
- key = p.e(E.PrivateIdentifier{ .ref = p.storeNameInRef(p.lexer.identifier) catch unreachable }, p.lexer.loc());
- p.lexer.next();
- },
- .t_open_bracket => {
- is_computed = true;
- // p.markSyntaxFeature(compat.objectExtensions, p.lexer.range())
- p.lexer.next();
- const wasIdentifier = p.lexer.token == .t_identifier;
- const expr = p.parseExpr(.comma);
-
- // Handle index signatures
- if (p.options.ts and p.lexer.token == .t_colon and wasIdentifier and opts.is_class) {
- switch (expr.data) {
- .e_identifier => |ident| {
- p.lexer.next();
- p.skipTypescriptType(.lowest);
- p.lexer.expect(.t_close_bracket);
- p.lexer.expect(.t_colon);
- p.skipTypescriptType(.lowest);
- p.lexer.expectOrInsertSemicolon();
-
- // Skip this property entirely
- return null;
- },
- else => {},
- }
- }
-
- p.lexer.expect(.t_close_bracket);
- key = expr;
- },
- .t_asterisk => {
- if (kind != .normal or opts.is_generator) {
- p.lexer.unexpected();
- }
-
- p.lexer.next();
- opts.is_generator = true;
- return p.parseProperty(.normal, opts, errors);
- },
-
- else => {
- const name = p.lexer.identifier;
- const raw = p.lexer.raw();
- const name_range = p.lexer.range();
-
- if (!p.lexer.isIdentifierOrKeyword()) {
- p.lexer.expect(.t_identifier);
- }
-
- p.lexer.next();
-
- // Support contextual keywords
- if (kind == .normal and !opts.is_generator) {
- // Does the following token look like a key?
- var couldBeModifierKeyword = p.lexer.isIdentifierOrKeyword();
- if (!couldBeModifierKeyword) {
- switch (p.lexer.token) {
- .t_open_bracket, .t_numeric_literal, .t_string_literal, .t_asterisk, .t_private_identifier => {
- couldBeModifierKeyword = true;
- },
- else => {},
- }
- }
-
- // If so, check for a modifier keyword
- if (couldBeModifierKeyword) {
- // TODO: micro-optimization, use a smaller list for non-typescript files.
- if (js_lexer.PropertyModifierKeyword.List.get(name)) |keyword| {
- switch (keyword) {
- .p_get => {
- if (!opts.is_async and strings.eql(raw, name)) {
- // p.markSyntaxFeautre(ObjectAccessors, name_range)
- return p.parseProperty(.get, opts, null);
- }
- },
-
- .p_set => {
- if (!opts.is_async and strings.eql(raw, name)) {
- // p.markSyntaxFeautre(ObjectAccessors, name_range)
- return p.parseProperty(.set, opts, null);
- }
- },
- .p_async => {
- if (!opts.is_async and strings.eql(raw, name) and !p.lexer.has_newline_before) {
- opts.is_async = true;
- opts.async_range = name_range;
-
- // p.markSyntaxFeautre(ObjectAccessors, name_range)
- return p.parseProperty(kind, opts, null);
- }
- },
- .p_static => {
- if (!opts.is_static and !opts.is_async and opts.is_class and strings.eql(raw, name)) {
- opts.is_static = true;
- return p.parseProperty(kind, opts, null);
- }
- },
- .p_private, .p_protected, .p_public, .p_readonly, .p_abstract, .p_declare, .p_override => {
- // Skip over TypeScript keywords
- if (opts.is_class and p.options.ts and strings.eql(raw, name)) {
- return p.parseProperty(kind, opts, null);
- }
- },
- }
- }
- }
- }
-
- key = p.e(E.String{
- .value = p.lexer.stringToUTF16(name),
- }, name_range.loc);
-
- // Parse a shorthand property
- if (!opts.is_class and kind == .normal and p.lexer.token != .t_colon and p.lexer.token != .t_open_paren and p.lexer.token != .t_less_than and !opts.is_generator and !js_lexer.Keywords.has(name)) {
- if ((p.fn_or_arrow_data_parse.allow_await != .allow_ident and strings.eql(name, "await")) or (p.fn_or_arrow_data_parse.allow_yield != .allow_ident and strings.eql(name, "yield"))) {
- // TODO: add fmt to addRangeError
- p.log.addRangeError(p.source, name_range, "Cannot use \"yield\" or \"await\" here.") catch unreachable;
- }
-
- const ref = p.storeNameInRef(name) catch unreachable;
- const value = p.e(E.Identifier{ .ref = ref }, key.loc);
-
- // Destructuring patterns have an optional default value
- var initializer: ?Expr = null;
- if (errors != null and p.lexer.token == .t_equals) {
- (errors orelse unreachable).invalid_expr_default_value = p.lexer.range();
- p.lexer.next();
- initializer = p.parseExpr(.comma);
- }
-
- return G.Property{
- .kind = kind,
- .key = key,
- .value = value,
- .initializer = initializer,
- .flags = Flags.Property{ .was_shorthand = true },
- };
- }
- },
- }
-
- if (p.options.ts) {
- // "class X { foo?: number }"
- // "class X { foo!: number }"
- if (opts.is_class and (p.lexer.token == .t_question or p.lexer.token == .t_exclamation)) {
- p.lexer.next();
- }
-
- // "class X { foo?<T>(): T }"
- // "const x = { foo<T>(): T {} }"
- p.skipTypescriptTypeParameters();
- }
-
- // Parse a class field with an optional initial value
- if (opts.is_class and kind == .normal and !opts.is_async and !opts.is_generator and p.lexer.token != .t_open_paren) {
- var initializer: ?Expr = null;
-
- // Forbid the names "constructor" and "prototype" in some cases
- if (!is_computed) {
- switch (key.data) {
- .e_string => |str| {
- if (std.mem.eql(u16, str.value, std.unicode.utf8ToUtf16LeStringLiteral("constructor")) or (opts.is_static and std.mem.eql(u16, str.value, std.unicode.utf8ToUtf16LeStringLiteral("prototype")))) {
- // TODO: fmt error message to include string value.
- p.log.addRangeError(p.source, key_range, "Invalid field name") catch unreachable;
- }
- },
- else => {},
- }
- }
-
- // Skip over types
- if (p.options.ts and p.lexer.token == .t_colon) {
- p.lexer.next();
- p.skipTypescriptType(.lowest);
- }
-
- if (p.lexer.token == .t_equals) {
- p.lexer.next();
- initializer = p.parseExpr(.comma);
- }
-
- // Special-case private identifiers
- switch (key.data) {
- .e_private_identifier => |private| {
- const name = p.loadNameFromRef(private.ref);
- if (strings.eql(name, "#constructor")) {
- p.log.addRangeError(p.source, key_range, "Invalid field name \"#constructor\"") catch unreachable;
- }
-
- var declare: js_ast.Symbol.Kind = undefined;
- if (opts.is_static) {
- declare = .private_static_field;
- } else {
- declare = .private_field;
- }
- private.ref = p.declareSymbol(declare, key.loc, name) catch unreachable;
- },
- else => {},
- }
-
- p.lexer.expectOrInsertSemicolon();
-
- return G.Property{
- .ts_decorators = opts.ts_decorators,
- .kind = kind,
- .flags = Flags.Property{
- .is_computed = is_computed,
- .is_static = opts.is_static,
- },
- .key = key,
- .initializer = initializer,
- };
- }
-
- // Parse a method expression
- if (p.lexer.token == .t_open_paren or kind != .normal or opts.is_class or opts.is_async or opts.is_generator) {
- if (p.lexer.token == .t_open_paren and kind != .get and kind != .set) {
- // markSyntaxFeature object extensions
- }
-
- const loc = p.lexer.loc();
- const scope_index = p.pushScopeForParsePass(.function_args, loc) catch unreachable;
- var is_constructor = false;
-
- // Forbid the names "constructor" and "prototype" in some cases
- if (opts.is_class and !is_computed) {
- switch (key.data) {
- .e_string => |str| {
- if (!opts.is_static and strings.eqlUtf16("constructor", str.value)) {
- if (kind == .get) {
- p.log.addRangeError(p.source, key_range, "Class constructor cannot be a getter") catch unreachable;
- } else if (kind == .set) {
- p.log.addRangeError(p.source, key_range, "Class constructor cannot be a setter") catch unreachable;
- } else if (opts.is_async) {
- p.log.addRangeError(p.source, key_range, "Class constructor cannot be an async function") catch unreachable;
- } else if (opts.is_generator) {
- p.log.addRangeError(p.source, key_range, "Class constructor cannot be a generator function") catch unreachable;
- } else {
- is_constructor = true;
- }
- } else if (opts.is_static and strings.eqlUtf16("prototype", str.value)) {
- p.log.addRangeError(p.source, key_range, "Invalid static method name \"prototype\"") catch unreachable;
- }
- },
- else => {},
- }
- }
-
- var func = p.parseFn(null, FnOrArrowDataParse{
- .async_range = opts.async_range,
- .allow_await = if (opts.is_async) AwaitOrYield.allow_expr else AwaitOrYield.allow_ident,
- .allow_yield = if (opts.is_generator) AwaitOrYield.allow_expr else AwaitOrYield.allow_ident,
- .allow_super_call = opts.class_has_extends and is_constructor,
- .allow_ts_decorators = opts.allow_ts_decorators,
- .is_constructor = is_constructor,
-
- // Only allow omitting the body if we're parsing TypeScript class
- .allow_missing_body_for_type_script = p.options.ts and opts.is_class,
- });
-
- // "class Foo { foo(): void; foo(): void {} }"
- if (func.body == null) {
- // Skip this property entirely
- p.popAndDiscardScope(scope_index);
- return null;
- }
-
- p.popScope();
- func.flags.is_unique_formal_parameters = true;
- const value = p.e(E.Function{ .func = func }, loc);
-
- // Enforce argument rules for accessors
- switch (kind) {
- .get => {
- if (func.args.len > 0) {
- const r = js_lexer.rangeOfIdentifier(&p.source, func.args[0].binding.loc);
- p.log.addRangeErrorFmt(p.source, r, p.allocator, "Getter {s} must have zero arguments", .{p.keyNameForError(key)}) catch unreachable;
- }
- },
- .set => {
- if (func.args.len != 1) {
- var r = js_lexer.rangeOfIdentifier(&p.source, if (func.args.len > 0) func.args[0].binding.loc else loc);
- if (func.args.len > 1) {
- r = js_lexer.rangeOfIdentifier(&p.source, func.args[1].binding.loc);
- }
- p.log.addRangeErrorFmt(p.source, r, p.allocator, "Setter {s} must have exactly 1 argument (there are {d})", .{ p.keyNameForError(key), func.args.len }) catch unreachable;
- }
- },
- else => {},
- }
-
- // Special-case private identifiers
- switch (key.data) {
- .e_private_identifier => |private| {
- var declare: Symbol.Kind = undefined;
- var suffix: string = undefined;
- switch (kind) {
- .get => {
- if (opts.is_static) {
- declare = .private_static_get;
- } else {
- declare = .private_get;
- }
- suffix = "_get";
- },
- .set => {
- if (opts.is_static) {
- declare = .private_static_set;
- } else {
- declare = .private_set;
- }
- suffix = "_set";
- },
- else => {
- if (opts.is_static) {
- declare = .private_static_method;
- } else {
- declare = .private_method;
- }
- suffix = "_fn";
- },
- }
-
- const name = p.loadNameFromRef(private.ref);
- if (strings.eql(name, "#constructor")) {
- p.log.addRangeError(p.source, key_range, "Invalid method name \"#constructor\"") catch unreachable;
- }
- private.ref = p.declareSymbol(declare, key.loc, name) catch unreachable;
- },
- else => {},
- }
-
- return G.Property{
- .ts_decorators = opts.ts_decorators,
- .kind = kind,
- .flags = Flags.Property{
- .is_computed = is_computed,
- .is_method = true,
- .is_static = opts.is_static,
- },
- .key = key,
- .value = value,
- };
- }
-
- p.lexer.expect(.t_colon);
-
- const value = p.parseExprOrBindings(.comma, errors);
-
- return G.Property{
- .ts_decorators = &[_]Expr{},
- .kind = kind,
- .flags = Flags.Property{
- .is_computed = is_computed,
- },
- .key = key,
- .value = value,
- };
- }
-
- // By the time we call this, the identifier and type parameters have already
- // been parsed. We need to start parsing from the "extends" clause.
- pub fn parseClass(p: *P, class_keyword: logger.Range, name: ?js_ast.LocRef, class_opts: ParseClassOptions) G.Class {
- var extends: ?Expr = null;
-
- if (p.lexer.token == .t_extends) {
- p.lexer.next();
- extends = p.parseExpr(.new);
-
- // TypeScript's type argument parser inside expressions backtracks if the
- // first token after the end of the type parameter list is "{", so the
- // parsed expression above will have backtracked if there are any type
- // arguments. This means we have to re-parse for any type arguments here.
- // This seems kind of wasteful to me but it's what the official compiler
- // does and it probably doesn't have that high of a performance overhead
- // because "extends" clauses aren't that frequent, so it should be ok.
- if (p.options.ts) {
- p.skipTypeScriptTypeArguments(false); // isInsideJSXElement
- }
- }
-
- if (p.options.ts and p.lexer.isContextualKeyword("implements")) {
- p.lexer.next();
-
- while (true) {
- p.skipTypescriptType(.lowest);
- if (p.lexer.token != .t_comma) {
- break;
- }
- p.lexer.next();
- }
- }
-
- var body_loc = p.lexer.loc();
- p.lexer.expect(T.t_open_brace);
- var properties = List(G.Property).init(p.allocator);
-
- // Allow "in" and private fields inside class bodies
- const old_allow_in = p.allow_in;
- const old_allow_private_identifiers = p.allow_private_identifiers;
- p.allow_in = true;
- p.allow_private_identifiers = true;
-
- // A scope is needed for private identifiers
- const scopeIndex = p.pushScopeForParsePass(.class_body, body_loc) catch unreachable;
-
- var opts = PropertyOpts{ .is_class = true, .allow_ts_decorators = class_opts.allow_ts_decorators, .class_has_extends = extends != null };
- while (p.lexer.token != T.t_close_brace) {
- if (p.lexer.token == .t_semicolon) {
- p.lexer.next();
- continue;
- }
-
- // Parse decorators for this property
- const first_decorator_loc = p.lexer.loc();
- if (opts.allow_ts_decorators) {
- opts.ts_decorators = p.parseTypeScriptDecorators();
- } else {
- opts.ts_decorators = &[_]Expr{};
- }
-
- // This property may turn out to be a type in TypeScript, which should be ignored
- if (p.parseProperty(.normal, &opts, null)) |property| {
- properties.append(property) catch unreachable;
-
- // Forbid decorators on class constructors
- if (opts.ts_decorators.len > 0) {
- switch ((property.key orelse p.panic("Internal error: Expected property {s} to have a key.", .{property})).data) {
- .e_string => |str| {
- if (strings.eqlUtf16("constructor", str.value)) {
- p.log.addError(p.source, first_decorator_loc, "TypeScript does not allow decorators on class constructors") catch unreachable;
- }
- },
- else => {},
- }
- }
- }
- }
-
- if (class_opts.is_type_script_declare) {
- p.popAndDiscardScope(scopeIndex);
- } else {
- p.popScope();
- }
-
- p.allow_in = old_allow_in;
- p.allow_private_identifiers = old_allow_private_identifiers;
-
- p.lexer.expect(.t_close_brace);
-
- return G.Class{
- .class_name = name,
- .extends = extends,
- .ts_decorators = class_opts.ts_decorators,
- .class_keyword = class_keyword,
- .body_loc = body_loc,
- .properties = properties.toOwnedSlice(),
- };
- }
-
- pub fn skipTypeScriptTypeArguments(p: *P, isInsideJSXElement: bool) void {
- notimpl();
- }
-
- pub fn parseTemplateParts(p: *P, include_raw: bool) std.meta.Tuple(&[_]type{ []E.TemplatePart, logger.Loc }) {
- var parts = List(E.TemplatePart).initCapacity(p.allocator, 1) catch unreachable;
- // Allow "in" inside template literals
- var oldAllowIn = p.allow_in;
- p.allow_in = true;
- var legacy_octal_loc = logger.Loc.Empty;
-
- parseTemplatePart: while (true) {
- p.lexer.next();
- var value = p.parseExpr(.lowest);
- var tail_loc = p.lexer.loc();
- p.lexer.rescanCloseBraceAsTemplateToken();
- var tail = p.lexer.string_literal;
- var tail_raw: string = "";
-
- if (include_raw) {
- tail_raw = p.lexer.rawTemplateContents();
- } else if (p.lexer.legacy_octal_loc.start > tail_loc.start) {
- legacy_octal_loc = p.lexer.legacy_octal_loc;
- }
-
- parts.append(E.TemplatePart{
- .value = value,
- .tail_loc = tail_loc,
- .tail = tail,
- .tail_raw = tail_raw,
- }) catch unreachable;
-
- if (p.lexer.token == .t_template_tail) {
- p.lexer.next();
- break :parseTemplatePart;
- }
- std.debug.assert(p.lexer.token != .t_end_of_file);
- }
-
- p.allow_in = oldAllowIn;
-
- return .{ .@"0" = parts.toOwnedSlice(), .@"1" = legacy_octal_loc };
- }
-
- // This assumes the caller has already checked for TStringLiteral or TNoSubstitutionTemplateLiteral
- pub fn parseStringLiteral(p: *P) Expr {
- var legacy_octal_loc: logger.Loc = logger.Loc.Empty;
- var loc = p.lexer.loc();
- if (p.lexer.legacy_octal_loc.start > loc.start) {
- legacy_octal_loc = p.lexer.legacy_octal_loc;
- }
-
- const expr = p.e(E.String{
- .value = p.lexer.string_literal,
- .legacy_octal_loc = legacy_octal_loc,
- .prefer_template = p.lexer.token == .t_no_substitution_template_literal,
- }, loc);
- p.lexer.next();
- return expr;
- }
-
- pub fn parseCallArgs(p: *P) []Expr {
- // Allow "in" inside call arguments
- const old_allow_in = p.allow_in;
- p.allow_in = true;
-
- var args = List(Expr).init(p.allocator);
- p.lexer.expect(.t_open_paren);
-
- while (p.lexer.token != .t_close_paren) {
- const loc = p.lexer.loc();
- const is_spread = p.lexer.token == .t_dot_dot_dot;
- if (is_spread) {
- // p.mark_syntax_feature(compat.rest_argument, p.lexer.range());
- p.lexer.next();
- }
- var arg = p.parseExpr(.comma);
- if (is_spread) {
- arg = p.e(E.Spread{ .value = arg }, loc);
- }
- args.append(arg) catch unreachable;
- if (p.lexer.token != .t_comma) {
- break;
- }
- p.lexer.next();
- }
-
- p.lexer.expect(.t_close_paren);
- p.allow_in = old_allow_in;
- return args.toOwnedSlice();
- }
-
- pub fn parseSuffix(p: *P, left: Expr, level: Level, errors: ?*DeferredErrors, flags: Expr.EFlags) Expr {
- return _parseSuffix(p, left, level, errors orelse &DeferredErrors.None, flags);
- }
- pub fn _parseSuffix(p: *P, _left: Expr, level: Level, errors: *DeferredErrors, flags: Expr.EFlags) Expr {
- var expr: Expr = undefined;
- var left = _left;
- var loc = p.lexer.loc();
- var optional_chain: ?js_ast.OptionalChain = null;
-
- while (true) {
- if (p.lexer.loc().start == p.after_arrow_body_loc.start) {
- while (true) {
- switch (p.lexer.token) {
- .t_comma => {
- if (level.gte(.comma)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{
- .op = .bin_comma,
- .left = left,
- .right = p.parseExpr(.comma),
- }, left.loc);
- },
- else => {
- return left;
- },
- }
- }
- }
-
- // Stop now if this token is forbidden to follow a TypeScript "as" cast
- if (p.lexer.loc().start == p.forbid_suffix_after_as_loc.start) {
- return left;
- }
-
- // Reset the optional chain flag by default. That way we won't accidentally
- // treat "c.d" as OptionalChainContinue in "a?.b + c.d".
- var old_optional_chain = optional_chain;
- optional_chain = null;
-
- switch (p.lexer.token) {
- .t_dot => {
- p.lexer.next();
- if (p.lexer.token == .t_private_identifier and p.allow_private_identifiers) {
- // "a.#b"
- // "a?.b.#c"
- switch (left.data) {
- .e_super => {
- p.lexer.expected(.t_identifier);
- },
- else => {},
- }
-
- var name = p.lexer.identifier;
- var name_loc = p.lexer.loc();
- p.lexer.next();
- const ref = p.storeNameInRef(name) catch unreachable;
- left = p.e(E.Index{
- .target = left,
- .index = p.e(
- E.PrivateIdentifier{
- .ref = ref,
- },
- name_loc,
- ),
- .optional_chain = old_optional_chain,
- }, left.loc);
- } else {
- // "a.b"
- // "a?.b.c"
- if (!p.lexer.isIdentifierOrKeyword()) {
- p.lexer.expect(.t_identifier);
- }
-
- var name = p.lexer.identifier;
- var name_loc = p.lexer.loc();
- p.lexer.next();
-
- left = p.e(E.Dot{ .target = left, .name = name, .name_loc = name_loc, .optional_chain = old_optional_chain }, left.loc);
- }
-
- optional_chain = old_optional_chain;
- },
- .t_question_dot => {
- p.lexer.next();
- var optional_start = js_ast.OptionalChain.start;
-
- // TODO: Remove unnecessary optional chains
- // if p.options.mangleSyntax {
- // if isNullOrUndefined, _, ok := toNullOrUndefinedWithSideEffects(left.Data); ok and !isNullOrUndefined {
- // optionalStart = js_ast.OptionalChainNone
- // }
- // }
-
- switch (p.lexer.token) {
- .t_open_bracket => {
- // "a?.[b]"
- p.lexer.next();
-
- // allow "in" inside the brackets;
- const old_allow_in = p.allow_in;
- p.allow_in = true;
-
- const index = p.parseExpr(.lowest);
-
- p.allow_in = old_allow_in;
-
- p.lexer.expect(.t_close_bracket);
- left = p.e(
- E.Index{ .target = left, .index = index, .optional_chain = optional_start },
- left.loc,
- );
- },
-
- .t_open_paren => {
- // "a?.()"
- if (level.gte(.call)) {
- return left;
- }
-
- left = p.e(E.Call{
- .target = left,
- .args = p.parseCallArgs(),
- .optional_chain = optional_start,
- }, left.loc);
- },
- .t_less_than => {
- // "a?.<T>()"
- if (!p.options.ts) {
- p.lexer.expected(.t_identifier);
- }
-
- p.skipTypeScriptTypeArguments(false);
- if (p.lexer.token != .t_open_paren) {
- p.lexer.expected(.t_open_paren);
- }
-
- if (level.gte(.call)) {
- return left;
- }
-
- left = p.e(
- E.Call{ .target = left, .args = p.parseCallArgs(), .optional_chain = optional_start },
- left.loc,
- );
- },
- else => {
- if (p.lexer.token == .t_private_identifier and p.allow_private_identifiers) {
- // "a?.#b"
- const name = p.lexer.identifier;
- const name_loc = p.lexer.loc();
- p.lexer.next();
- const ref = p.storeNameInRef(name) catch unreachable;
- left = p.e(E.Index{
- .target = left,
- .index = p.e(
- E.PrivateIdentifier{
- .ref = ref,
- },
- name_loc,
- ),
- .optional_chain = optional_start,
- }, left.loc);
- } else {
- // "a?.b"
- if (!p.lexer.isIdentifierOrKeyword()) {
- p.lexer.expect(.t_identifier);
- }
- const name = p.lexer.identifier;
- const name_loc = p.lexer.loc();
- p.lexer.next();
-
- left = p.e(E.Dot{
- .target = left,
- .name = name,
- .name_loc = name_loc,
- .optional_chain = optional_start,
- }, left.loc);
- }
- },
- }
-
- // Only continue if we have started
- if (optional_start == .start) {
- optional_start = .ccontinue;
- }
- },
- .t_no_substitution_template_literal => {
- if (old_optional_chain != null) {
- p.log.addRangeError(p.source, p.lexer.range(), "Template literals cannot have an optional chain as a tag") catch unreachable;
- }
- // p.markSyntaxFeature(compat.TemplateLiteral, p.lexer.Range());
- const head = p.lexer.string_literal;
- const head_raw = p.lexer.rawTemplateContents();
- p.lexer.next();
- left = p.e(E.Template{
- .tag = left,
- .head = head,
- .head_raw = head_raw,
- .legacy_octal_loc = logger.Loc.Empty,
- }, left.loc);
- },
- .t_template_head => {
- if (old_optional_chain != null) {
- p.log.addRangeError(p.source, p.lexer.range(), "Template literals cannot have an optional chain as a tag") catch unreachable;
- }
- // p.markSyntaxFeature(compat.TemplateLiteral, p.lexer.Range());
- const head = p.lexer.string_literal;
- const head_raw = p.lexer.rawTemplateContents();
- const partsGroup = p.parseTemplateParts(true);
- p.lexer.next();
- const tag = left;
- left = p.e(E.Template{ .tag = tag, .head = head, .head_raw = head_raw, .parts = partsGroup.@"0" }, left.loc);
- },
- .t_open_bracket => {
- // When parsing a decorator, ignore EIndex expressions since they may be
- // part of a computed property:
- //
- // class Foo {
- // @foo ['computed']() {}
- // }
- //
- // This matches the behavior of the TypeScript compiler.
- if (flags != .ts_decorator) {
- return left;
- }
-
- p.lexer.next();
-
- // Allow "in" inside the brackets
- const old_allow_in = p.allow_in;
- p.allow_in = true;
-
- const index = p.parseExpr(.lowest);
-
- p.allow_in = old_allow_in;
-
- p.lexer.expect(.t_close_bracket);
-
- left = p.e(E.Index{
- .target = left,
- .index = index,
- .optional_chain = old_optional_chain,
- }, left.loc);
- optional_chain = old_optional_chain;
- },
- .t_open_paren => {
- if (level.gte(.call)) {
- return left;
- }
-
- left = p.e(
- E.Call{
- .target = left,
- .args = p.parseCallArgs(),
- .optional_chain = old_optional_chain,
- },
- left.loc,
- );
- optional_chain = old_optional_chain;
- },
- .t_question => {
- if (level.gte(.conditional)) {
- return left;
- }
- p.lexer.next();
-
- // Stop now if we're parsing one of these:
- // "(a?) => {}"
- // "(a?: b) => {}"
- // "(a?, b?) => {}"
- if (p.options.ts and left.loc.start == p.latest_arrow_arg_loc.start and (p.lexer.token == .t_colon or
- p.lexer.token == .t_close_paren or p.lexer.token == .t_comma))
- {
- if (errors.isEmpty()) {
- p.lexer.unexpected();
- }
- errors.invalid_expr_after_question = p.lexer.range();
- return left;
- }
-
- // Allow "in" in between "?" and ":"
- const old_allow_in = p.allow_in;
- p.allow_in = true;
-
- const yes = p.parseExpr(.comma);
-
- p.allow_in = old_allow_in;
- p.lexer.expect(.t_colon);
- const no = p.parseExpr(.comma);
-
- left = p.e(E.If{
- .test_ = left,
- .yes = yes,
- .no = no,
- }, left.loc);
- },
- .t_exclamation => {
- // Skip over TypeScript non-null assertions
- if (p.lexer.has_newline_before) {
- return left;
- }
-
- if (!p.options.ts) {
- p.lexer.unexpected();
- }
-
- if (level.gte(.postfix)) {
- return left;
- }
-
- p.lexer.next();
- optional_chain = old_optional_chain;
- },
- .t_minus_minus => {
- if (p.lexer.has_newline_before or level.gte(.postfix)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Unary{ .op = .un_post_dec, .value = left }, left.loc);
- },
- .t_plus_plus => {
- if (p.lexer.has_newline_before or level.gte(.postfix)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Unary{ .op = .un_post_inc, .value = left }, left.loc);
- },
- .t_comma => {
- if (level.gte(.comma)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_comma, .left = left, .right = p.parseExpr(.comma) }, left.loc);
- },
- .t_plus => {
- if (level.gte(.add)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_add, .left = left, .right = p.parseExpr(.add) }, left.loc);
- },
- .t_plus_equals => {
- if (level.gte(.assign)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_add_assign, .left = left, .right = p.parseExpr(@intToEnum(Op.Level, @enumToInt(Op.Level.assign) - 1)) }, left.loc);
- },
- .t_minus => {
- if (level.gte(.add)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_sub, .left = left, .right = p.parseExpr(.add) }, left.loc);
- },
- .t_minus_equals => {
- if (level.gte(.assign)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_sub_assign, .left = left, .right = p.parseExpr(Op.Level.assign.sub(1)) }, left.loc);
- },
- .t_asterisk => {
- if (level.gte(.multiply)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_mul, .left = left, .right = p.parseExpr(.multiply) }, left.loc);
- },
- .t_asterisk_asterisk => {
- if (level.gte(.exponentiation)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_pow, .left = left, .right = p.parseExpr(Op.Level.exponentiation.sub(1)) }, left.loc);
- },
- .t_asterisk_asterisk_equals => {
- if (level.gte(.assign)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_pow_assign, .left = left, .right = p.parseExpr(Op.Level.assign.sub(1)) }, left.loc);
- },
- .t_asterisk_equals => {
- if (level.gte(.assign)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_mul_assign, .left = left, .right = p.parseExpr(Op.Level.assign.sub(1)) }, left.loc);
- },
- .t_percent => {
- if (level.gte(.multiply)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_rem, .left = left, .right = p.parseExpr(Op.Level.multiply) }, left.loc);
- },
- .t_percent_equals => {
- if (level.gte(.assign)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_rem_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
- },
- .t_slash => {
- if (level.gte(.multiply)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_div, .left = left, .right = p.parseExpr(Level.multiply) }, left.loc);
- },
- .t_slash_equals => {
- if (level.gte(.assign)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_div_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
- },
- .t_equals_equals => {
- if (level.gte(.equals)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_loose_eq, .left = left, .right = p.parseExpr(Level.equals) }, left.loc);
- },
- .t_exclamation_equals => {
- if (level.gte(.equals)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_loose_ne, .left = left, .right = p.parseExpr(Level.equals) }, left.loc);
- },
- .t_equals_equals_equals => {
- if (level.gte(.equals)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_strict_eq, .left = left, .right = p.parseExpr(Level.equals) }, left.loc);
- },
- .t_exclamation_equals_equals => {
- if (level.gte(.equals)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_strict_ne, .left = left, .right = p.parseExpr(Level.equals) }, left.loc);
- },
- .t_less_than => {
- // TypeScript allows type arguments to be specified with angle brackets
- // inside an expression. Unlike in other languages, this unfortunately
- // appears to require backtracking to parse.
- if (p.options.ts and p.trySkipTypeScriptTypeArgumentsWithBacktracking()) {
- optional_chain = old_optional_chain;
- continue;
- }
-
- if (level.gte(.compare)) {
- return left;
- }
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_lt, .left = left, .right = p.parseExpr(.compare) }, left.loc);
- },
- .t_less_than_equals => {
- if (level.gte(.compare)) {
- return left;
- }
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_le, .left = left, .right = p.parseExpr(.compare) }, left.loc);
- },
- .t_greater_than => {
- if (level.gte(.compare)) {
- return left;
- }
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_gt, .left = left, .right = p.parseExpr(.compare) }, left.loc);
- },
- .t_greater_than_equals => {
- if (level.gte(.compare)) {
- return left;
- }
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_ge, .left = left, .right = p.parseExpr(.compare) }, left.loc);
- },
- .t_less_than_less_than => {
- if (level.gte(.shift)) {
- return left;
- }
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_shl, .left = left, .right = p.parseExpr(.shift) }, left.loc);
- },
- .t_less_than_less_than_equals => {
- if (level.gte(.assign)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_shl_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
- },
- .t_greater_than_greater_than => {
- if (level.gte(.shift)) {
- return left;
- }
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_shr, .left = left, .right = p.parseExpr(.shift) }, left.loc);
- },
- .t_greater_than_greater_than_equals => {
- if (level.gte(.assign)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_shl_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
- },
- .t_greater_than_greater_than_greater_than => {
- if (level.gte(.shift)) {
- return left;
- }
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_u_shr, .left = left, .right = p.parseExpr(.shift) }, left.loc);
- },
- .t_greater_than_greater_than_greater_than_equals => {
- if (level.gte(.assign)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_u_shr_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
- },
- .t_question_question => {
- if (level.gte(.nullish_coalescing)) {
- return left;
- }
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_nullish_coalescing, .left = left, .right = p.parseExpr(.nullish_coalescing) }, left.loc);
- },
- .t_question_question_equals => {
- if (level.gte(.assign)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_nullish_coalescing_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
- },
- .t_bar_bar => {
- if (level.gte(.logical_or)) {
- return left;
- }
-
- // Prevent "||" inside "??" from the right
- if (level.eql(.nullish_coalescing)) {
- p.lexer.unexpected();
- }
-
- p.lexer.next();
- const right = p.parseExpr(.logical_or);
- left = p.e(E.Binary{ .op = Op.Code.bin_logical_or, .left = left, .right = right }, left.loc);
-
- if (level.lt(.nullish_coalescing)) {
- left = p.parseSuffix(left, Level.nullish_coalescing.add(1), null, flags);
-
- if (p.lexer.token == .t_question_question) {
- p.lexer.unexpected();
- }
- }
- },
- .t_bar_bar_equals => {
- if (level.gte(.assign)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_logical_or_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
- },
- .t_ampersand_ampersand => {
- if (level.gte(.logical_and)) {
- return left;
- }
-
- // Prevent "&&" inside "??" from the right
- if (level.eql(.nullish_coalescing)) {
- p.lexer.unexpected();
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_logical_and, .left = left, .right = p.parseExpr(.logical_and) }, left.loc);
-
- // Prevent "&&" inside "??" from the left
- if (level.lt(.nullish_coalescing)) {
- left = p.parseSuffix(left, Level.nullish_coalescing.add(1), null, flags);
-
- if (p.lexer.token == .t_question_question) {
- p.lexer.unexpected();
- }
- }
- },
- .t_ampersand_ampersand_equals => {
- if (level.gte(.assign)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_logical_and_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
- },
- .t_bar => {
- if (level.gte(.bitwise_or)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_bitwise_or, .left = left, .right = p.parseExpr(.bitwise_or) }, left.loc);
- },
- .t_bar_equals => {
- if (level.gte(.assign)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_bitwise_or_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
- },
- .t_ampersand => {
- if (level.gte(.bitwise_and)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_bitwise_and, .left = left, .right = p.parseExpr(.bitwise_and) }, left.loc);
- },
- .t_ampersand_equals => {
- if (level.gte(.assign)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_shl_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
- },
- .t_caret => {
- if (level.gte(.bitwise_xor)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_bitwise_xor, .left = left, .right = p.parseExpr(.bitwise_xor) }, left.loc);
- },
- .t_caret_equals => {
- if (level.gte(.assign)) {
- return left;
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_bitwise_xor_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
- },
- .t_equals => {
- if (level.gte(.assign)) {
- return left;
- }
-
- p.lexer.next();
-
- left = p.e(E.Binary{ .op = .bin_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
- },
- .t_in => {
- if (level.gte(.compare) or !p.allow_in) {
- return left;
- }
-
- // Warn about "!a in b" instead of "!(a in b)"
- switch (left.data) {
- .e_unary => |unary| {
- if (unary.op == .un_not) {
- // TODO:
- // p.log.addRangeWarning(source: ?Source, r: Range, text: string)
- }
- },
- else => {},
- }
-
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_in, .left = left, .right = p.parseExpr(.compare) }, left.loc);
- },
- .t_instanceof => {
- if (level.gte(.compare)) {
- return left;
- }
-
- // Warn about "!a instanceof b" instead of "!(a instanceof b)". Here's an
- // example of code with this problem: https://github.com/mrdoob/three.js/pull/11182.
- if (!p.options.suppress_warnings_about_weird_code) {
- switch (left.data) {
- .e_unary => |unary| {
- if (unary.op == .un_not) {
- // TODO:
- // p.log.addRangeWarning(source: ?Source, r: Range, text: string)
- }
- },
- else => {},
- }
- }
- p.lexer.next();
- left = p.e(E.Binary{ .op = .bin_instanceof, .left = left, .right = p.parseExpr(.compare) }, left.loc);
- },
- else => {
- // Handle the TypeScript "as" operator
- if (p.options.ts and level.lt(.compare) and !p.lexer.has_newline_before and p.lexer.isContextualKeyword("as")) {
- p.lexer.next();
- p.skipTypescriptType(.lowest);
-
- // These tokens are not allowed to follow a cast expression. This isn't
- // an outright error because it may be on a new line, in which case it's
- // the start of a new expression when it's after a cast:
- //
- // x = y as z
- // (something);
- //
- switch (p.lexer.token) {
- .t_plus_plus,
- .t_minus_minus,
- .t_no_substitution_template_literal,
- .t_template_head,
- .t_open_paren,
- .t_open_bracket,
- .t_question_dot,
- => {
- p.forbid_suffix_after_as_loc = p.lexer.loc();
- return left;
- },
- else => {},
- }
-
- if (p.lexer.token.isAssign()) {
- p.forbid_suffix_after_as_loc = p.lexer.loc();
- return left;
- }
- continue;
- }
-
- return left;
- },
- }
- }
- }
-
- pub fn panic(p: *P, comptime str: string, args: anytype) noreturn {
- p.log.addRangeErrorFmt(p.source, p.lexer.range(), p.allocator, str, args) catch unreachable;
-
- var fixedBuffer = [_]u8{0} ** 4096;
- var stream = std.io.fixedBufferStream(&fixedBuffer);
-
- p.log.print(stream.writer()) catch unreachable;
- std.debug.panic("{s}", .{fixedBuffer});
- }
-
- pub fn _parsePrefix(p: *P, level: Level, errors: *DeferredErrors, flags: Expr.EFlags) Expr {
- const loc = p.lexer.loc();
- const l = @enumToInt(level);
- std.debug.print("Parse Prefix {s}:{s} @{s} ", .{ p.lexer.token, p.lexer.raw(), @tagName(level) });
-
- switch (p.lexer.token) {
- .t_super => {
- const superRange = p.lexer.range();
- p.lexer.next();
-
- switch (p.lexer.token) {
- .t_open_paren => {
- if (l < @enumToInt(Level.call) and p.fn_or_arrow_data_parse.allow_super_call) {
- return p.e(E.Super{}, loc);
- }
- },
- .t_dot, .t_open_bracket => {
- return p.e(E.Super{}, loc);
- },
- else => {},
- }
-
- p.log.addRangeError(p.source, superRange, "Unexpected \"super\"") catch unreachable;
- return p.e(E.Super{}, loc);
- },
- .t_open_paren => {
- p.lexer.next();
-
- // Arrow functions aren't allowed in the middle of expressions
- if (level.gt(.assign)) {
- const oldAllowIn = p.allow_in;
- p.allow_in = true;
-
- var value = p.parseExpr(Level.lowest);
- p.markExprAsParenthesized(&value);
- p.lexer.expect(.t_close_paren);
- p.allow_in = oldAllowIn;
- return value;
- }
-
- return p.parseParenExpr(loc, ParenExprOpts{}) catch unreachable;
- },
- .t_false => {
- p.lexer.next();
- return p.e(E.Boolean{ .value = false }, loc);
- },
- .t_true => {
- p.lexer.next();
- return p.e(E.Boolean{ .value = true }, loc);
- },
- .t_null => {
- p.lexer.next();
- return p.e(E.Null{}, loc);
- },
- .t_this => {
- p.lexer.next();
- return p.e(E.This{}, loc);
- },
- .t_identifier => {
- const name = p.lexer.identifier;
- const name_range = p.lexer.range();
- const raw = p.lexer.raw();
- p.lexer.next();
-
- // Handle async and await expressions
- switch (AsyncPrefixExpression.find(name)) {
- .is_async => {
- if (AsyncPrefixExpression.find(raw) != .is_async) {
- return p.parseAsyncPrefixExpr(name_range, level) catch unreachable;
- }
- },
-
- .is_await => {
- switch (p.fn_or_arrow_data_parse.allow_await) {
- .forbid_all => {
- p.log.addRangeError(p.source, name_range, "The keyword \"await\" cannot be used here.") catch unreachable;
- },
- .allow_expr => {
- if (AsyncPrefixExpression.find(raw) != .is_await) {
- p.log.addRangeError(p.source, name_range, "The keyword \"await\" cannot be escaped.") catch unreachable;
- } else {
- if (p.fn_or_arrow_data_parse.is_top_level) {
- p.top_level_await_keyword = name_range;
- }
-
- if (p.fn_or_arrow_data_parse.arrow_arg_errors) |*args| {
- args.invalid_expr_await = name_range;
- }
-
- const value = p.parseExpr(.prefix);
- if (p.lexer.token == T.t_asterisk_asterisk) {
- p.lexer.unexpected();
- }
-
- return p.e(E.Await{ .value = value }, loc);
- }
- },
- .allow_ident => {},
- }
- },
-
- .is_yield => {
- switch (p.fn_or_arrow_data_parse.allow_yield) {
- .forbid_all => {
- p.log.addRangeError(p.source, name_range, "The keyword \"yield\" cannot be used here") catch unreachable;
- },
- .allow_expr => {
- if (AsyncPrefixExpression.find(raw) != .is_yield) {
- p.log.addRangeError(p.source, name_range, "The keyword \"yield\" cannot be escaped") catch unreachable;
- } else {
- if (level.gte(.assign)) {
- p.log.addRangeError(p.source, name_range, "Cannot use a \"yield\" here without parentheses") catch unreachable;
- }
- const value = p.parseExpr(.prefix);
-
- if (p.fn_or_arrow_data_parse.arrow_arg_errors) |*args| {
- args.invalid_expr_yield = name_range;
- }
-
- if (p.lexer.token == T.t_asterisk_asterisk) {
- p.lexer.unexpected();
- }
-
- return p.e(E.Yield{ .value = value }, loc);
- }
- },
- .allow_ident => {
- // Try to gracefully recover if "yield" is used in the wrong place
- if (!p.lexer.has_newline_before) {
- switch (p.lexer.token) {
- .t_null, .t_identifier, .t_false, .t_true, .t_numeric_literal, .t_big_integer_literal, .t_string_literal => {
- p.log.addRangeError(p.source, name_range, "Cannot use \"yield\" outside a generator function") catch unreachable;
- },
- else => {},
- }
- }
- },
- }
- },
- .none => {},
- }
-
- // Handle the start of an arrow expression
- if (p.lexer.token == .t_equals_greater_than) {
- const ref = p.storeNameInRef(name) catch unreachable;
- var args = p.allocator.alloc(Arg, 1) catch unreachable;
- args[0] = Arg{ .binding = p.b(B.Identifier{
- .ref = ref,
- }, loc) };
-
- _ = p.pushScopeForParsePass(.function_args, loc) catch unreachable;
- defer p.popScope();
- return p.e(p.parseArrowBody(args, p.m(FnOrArrowDataParse{})) catch unreachable, loc);
- }
-
- const ref = p.storeNameInRef(name) catch unreachable;
-
- return p.e(E.Identifier{
- .ref = ref,
- }, loc);
- },
- .t_string_literal, .t_no_substitution_template_literal => {
- return p.parseStringLiteral();
- },
- .t_template_head => {
- var legacy_octal_loc = logger.Loc.Empty;
- var head = p.lexer.string_literal;
- var head_raw = p.lexer.raw();
- if (p.lexer.legacy_octal_loc.start > loc.start) {
- legacy_octal_loc = p.lexer.legacy_octal_loc;
- }
-
- var resp = p.parseTemplateParts(false);
- const parts: []E.TemplatePart = resp.@"0";
- const tail_legacy_octal_loc: logger.Loc = resp.@"1";
- if (tail_legacy_octal_loc.start > 0) {
- legacy_octal_loc = tail_legacy_octal_loc;
- }
- // Check if TemplateLiteral is unsupported. We don't care for this product.`
- // if ()
-
- return p.e(E.Template{ .head = head, .parts = parts, .legacy_octal_loc = legacy_octal_loc, .head_raw = head_raw }, loc);
- },
- .t_numeric_literal => {
- const value = p.e(E.Number{ .value = p.lexer.number }, loc);
- // p.checkForLegacyOctalLiteral()
- p.lexer.next();
- return value;
- },
- .t_big_integer_literal => {
- const value = p.lexer.identifier;
- // markSyntaxFeature bigInt
- p.lexer.next();
- return p.e(E.BigInt{ .value = value }, loc);
- },
- .t_slash, .t_slash_equals => {
- p.lexer.scanRegExp();
- const value = p.lexer.raw();
- p.lexer.next();
- return p.e(E.RegExp{ .value = value }, loc);
- },
- .t_void => {
- p.lexer.next();
- const value = p.parseExpr(.prefix);
- if (p.lexer.token == .t_asterisk_asterisk) {
- p.lexer.unexpected();
- }
-
- return p.e(E.Unary{
- .op = .un_void,
- .value = value,
- }, loc);
- },
- .t_typeof => {
- p.lexer.next();
- const value = p.parseExpr(.prefix);
- if (p.lexer.token == .t_asterisk_asterisk) {
- p.lexer.unexpected();
- }
-
- return p.e(E.Unary{ .op = .un_typeof, .value = value }, loc);
- },
- .t_delete => {
- p.lexer.next();
- const value = p.parseExpr(.prefix);
- if (p.lexer.token == .t_asterisk_asterisk) {
- p.lexer.unexpected();
- }
- // TODO: add error deleting private identifier
- // const private = value.data.e_private_identifier;
- // if (private) |private| {
- // const name = p.loadNameFromRef(private.ref);
- // p.log.addRangeError(index.loc, )
- // }
-
- return p.e(E.Unary{ .op = .un_delete, .value = value }, loc);
- },
- .t_plus => {
- p.lexer.next();
- const value = p.parseExpr(.prefix);
- if (p.lexer.token == .t_asterisk_asterisk) {
- p.lexer.unexpected();
- }
-
- return p.e(E.Unary{ .op = .un_pos, .value = value }, loc);
- },
- .t_minus => {
- p.lexer.next();
- const value = p.parseExpr(.prefix);
- if (p.lexer.token == .t_asterisk_asterisk) {
- p.lexer.unexpected();
- }
-
- return p.e(E.Unary{ .op = .un_neg, .value = value }, loc);
- },
- .t_tilde => {
- p.lexer.next();
- const value = p.parseExpr(.prefix);
- if (p.lexer.token == .t_asterisk_asterisk) {
- p.lexer.unexpected();
- }
-
- return p.e(E.Unary{ .op = .un_cpl, .value = value }, loc);
- },
- .t_exclamation => {
- p.lexer.next();
- const value = p.parseExpr(.prefix);
- if (p.lexer.token == .t_asterisk_asterisk) {
- p.lexer.unexpected();
- }
-
- return p.e(E.Unary{ .op = .un_not, .value = value }, loc);
- },
- .t_minus_minus => {
- p.lexer.next();
- return p.e(E.Unary{ .op = .un_pre_dec, .value = p.parseExpr(.prefix) }, loc);
- },
- .t_plus_plus => {
- p.lexer.next();
- return p.e(E.Unary{ .op = .un_pre_inc, .value = p.parseExpr(.prefix) }, loc);
- },
- .t_function => {
- return p.parseFnExpr(loc, false, logger.Range.None) catch unreachable;
- },
- .t_class => {
- const classKeyword = p.lexer.range();
- // markSyntaxFEatuer class
- p.lexer.next();
- var name: ?js_ast.LocRef = null;
-
- _ = p.pushScopeForParsePass(.class_name, loc) catch unreachable;
-
- // Parse an optional class name
- if (p.lexer.token == .t_identifier and !js_lexer.StrictModeReservedWords.has(p.lexer.identifier)) {
- name = js_ast.LocRef{ .loc = p.lexer.loc(), .ref = p.newSymbol(.other, p.lexer.identifier) catch unreachable };
- p.lexer.next();
- }
-
- // Even anonymous classes can have TypeScript type parameters
- if (p.options.ts) {
- p.skipTypescriptTypeParameters();
- }
-
- const class = p.parseClass(classKeyword, name, ParseClassOptions{});
- p.popScope();
- return p.e(class, loc);
- },
- .t_new => {
- p.lexer.next();
-
- // Special-case the weird "new.target" expression here
-
- const target = p.parseExprWithFlags(.member, flags);
- var args: []Expr = &([_]Expr{});
-
- if (p.options.ts) {
- // Skip over TypeScript non-null assertions
- if (p.lexer.token == .t_exclamation and !p.lexer.has_newline_before) {
- p.lexer.next();
- }
-
- // Skip over TypeScript type arguments here if there are any
- if (p.lexer.token == .t_less_than) {
- _ = p.trySkipTypeScriptTypeArgumentsWithBacktracking();
- }
- }
-
- if (p.lexer.token == .t_open_paren) {
- args = p.parseCallArgs();
- }
-
- return p.e(E.New{
- .target = target,
- .args = args,
- }, loc);
- },
- .t_open_bracket => {
- p.lexer.next();
- var is_single_line = !p.lexer.has_newline_before;
- var items = List(Expr).init(p.allocator);
- var self_errors = DeferredErrors{};
- var comma_after_spread = logger.Loc{};
-
- // Allow "in" inside arrays
- const old_allow_in = p.allow_in;
- p.allow_in = true;
-
- while (p.lexer.token != .t_close_bracket) {
- switch (p.lexer.token) {
- .t_comma => {
- items.append(p.e(E.Missing{}, p.lexer.loc())) catch unreachable;
- },
- .t_dot_dot_dot => {
- // this might be wrong.
- errors.array_spread_feature = p.lexer.range();
-
- const dots_loc = p.lexer.loc();
- p.lexer.next();
- items.append(
- p.parseExprOrBindings(.comma, &self_errors),
- ) catch unreachable;
- },
- else => {
- items.append(
- p.parseExprOrBindings(.comma, &self_errors),
- ) catch unreachable;
- },
- }
-
- if (p.lexer.token != .t_comma) {
- break;
- }
-
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
-
- p.lexer.next();
-
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
- }
-
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
-
- p.lexer.expect(.t_close_bracket);
- p.allow_in = old_allow_in;
-
- if (p.willNeedBindingPattern()) {} else if (errors.isEmpty()) {
- // Is this an expression?
- p.logExprErrors(&self_errors);
- } else {
- // In this case, we can't distinguish between the two yet
- self_errors.mergeInto(errors);
- }
- return p.e(E.Array{
- .items = items.toOwnedSlice(),
- .comma_after_spread = comma_after_spread,
- .is_single_line = is_single_line,
- }, loc);
- },
- .t_open_brace => {
- p.lexer.next();
- var is_single_line = !p.lexer.has_newline_before;
- var properties = List(G.Property).init(p.allocator);
- var self_errors = DeferredErrors{};
- var comma_after_spread = logger.Loc{};
-
- // Allow "in" inside object literals
- const old_allow_in = p.allow_in;
- p.allow_in = true;
-
- while (p.lexer.token != .t_close_brace) {
- if (p.lexer.token == .t_dot_dot_dot) {
- p.lexer.next();
- properties.append(G.Property{ .kind = .spread, .value = p.parseExpr(.comma) }) catch unreachable;
-
- // Commas are not allowed here when destructuring
- if (p.lexer.token == .t_comma) {
- comma_after_spread = p.lexer.loc();
- }
- } else {
- // This property may turn out to be a type in TypeScript, which should be ignored
- var propertyOpts = PropertyOpts{};
- if (p.parseProperty(.normal, &propertyOpts, &self_errors)) |prop| {
- properties.append(prop) catch unreachable;
- }
- }
-
- if (p.lexer.token != .t_comma) {
- break;
- }
-
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
-
- p.lexer.next();
-
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
- }
-
- if (p.lexer.has_newline_before) {
- is_single_line = false;
- }
-
- p.lexer.expect(.t_close_brace);
- p.allow_in = old_allow_in;
-
- if (p.willNeedBindingPattern()) {} else if (errors.isEmpty()) {
- // Is this an expression?
- p.logExprErrors(&self_errors);
- } else {
- // In this case, we can't distinguish between the two yet
- self_errors.mergeInto(errors);
- }
- return p.e(E.Object{
- .properties = properties.toOwnedSlice(),
- .comma_after_spread = comma_after_spread,
- .is_single_line = is_single_line,
- }, loc);
- },
- .t_less_than => {
- // This is a very complicated and highly ambiguous area of TypeScript
- // syntax. Many similar-looking things are overloaded.
- //
- // TS:
- //
- // A type cast:
- // <A>(x)
- // <[]>(x)
- // <A[]>(x)
- //
- // An arrow function with type parameters:
- // <A>(x) => {}
- // <A, B>(x) => {}
- // <A = B>(x) => {}
- // <A extends B>(x) => {}
- //
- // TSX:
- //
- // A JSX element:
- // <A>(x) => {}</A>
- // <A extends>(x) => {}</A>
- // <A extends={false}>(x) => {}</A>
- //
- // An arrow function with type parameters:
- // <A, B>(x) => {}
- // <A extends B>(x) => {}
- //
- // A syntax error:
- // <[]>(x)
- // <A[]>(x)
- // <A>(x) => {}
- // <A = B>(x) => {}
- if (p.options.ts and p.options.jsx.parse) {
- var oldLexer = p.lexer;
-
- p.lexer.next();
- // Look ahead to see if this should be an arrow function instead
- var is_ts_arrow_fn = false;
-
- if (p.lexer.token == .t_identifier) {
- p.lexer.next();
- if (p.lexer.token == .t_comma) {
- is_ts_arrow_fn = true;
- } else if (p.lexer.token == .t_extends) {
- p.lexer.next();
- is_ts_arrow_fn = p.lexer.token != .t_equals and p.lexer.token != .t_greater_than;
- }
- }
-
- // Restore the lexer
- p.lexer = oldLexer;
-
- if (is_ts_arrow_fn) {
- p.skipTypescriptTypeParameters();
- p.lexer.expect(.t_open_paren);
- return p.parseParenExpr(loc, ParenExprOpts{ .force_arrow_fn = true }) catch unreachable;
- }
- }
-
- if (p.options.jsx.parse) {
- notimpl();
- }
-
- if (p.options.ts) {
- notimpl();
- }
-
- p.lexer.unexpected();
- return p.e(E.Missing{}, logger.Loc.Empty);
- },
- .t_import => {
- p.lexer.next();
- return p.parseImportExpr(loc, level);
- },
- else => {
- p.lexer.unexpected();
- return p.e(E.Missing{}, logger.Loc.Empty);
- },
- }
-
- return p.e(E.Missing{}, logger.Loc.Empty);
- }
-
- pub fn jsxStringsToMemberExpression(p: *P, loc: logger.Loc, fragment: string) Expr {
- notimpl();
- }
-
- // Note: The caller has already parsed the "import" keyword
- pub fn parseImportExpr(p: *P, loc: logger.Loc, level: Level) Expr {
- // Parse an "import.meta" expression
- if (p.lexer.token == .t_dot) {
- p.es6_import_keyword = js_lexer.rangeOfIdentifier(&p.source, loc);
- p.lexer.next();
- if (p.lexer.isContextualKeyword("meta")) {
- const r = p.lexer.range();
- p.lexer.next();
- p.has_import_meta = true;
- return p.e(E.ImportMeta{}, loc);
- } else {
- p.lexer.expectedString("\"meta\"");
- }
- }
-
- if (level.gt(.call)) {
- const r = js_lexer.rangeOfIdentifier(&p.source, loc);
- p.log.addRangeError(p.source, r, "Cannot use an \"import\" expression here without parentheses") catch unreachable;
- }
- // allow "in" inside call arguments;
- var old_allow_in = p.allow_in;
- p.allow_in = true;
-
- p.lexer.preserve_all_comments_before = true;
- p.lexer.expect(.t_open_paren);
- const comments = p.lexer.comments_to_preserve_before.toOwnedSlice();
- p.lexer.preserve_all_comments_before = false;
-
- const value = p.parseExpr(.comma);
- p.lexer.expect(.t_close_paren);
-
- p.allow_in = old_allow_in;
- return p.e(E.Import{ .expr = value, .leading_interior_comments = comments, .import_record_index = 0 }, loc);
- }
-
- pub fn parseJSXElement(loc: logger.Loc) Expr {
- // Parse the tag
- //var startRange, startText, startTag := p.parseJSXTag();÷
- notimpl();
- return p.e(E.Missing{}, logger.Loc.Empty);
- }
-
- pub fn willNeedBindingPattern(p: *P) bool {
- switch (p.lexer.token) {
- .t_equals => {
- // "[a] = b;"
- return true;
- },
- .t_in => {
- // "for ([a] in b) {}"
- return !p.allow_in;
- },
- .t_identifier => {
- // "for ([a] of b) {}"
- return p.allow_in and p.lexer.isContextualKeyword("of");
- },
- else => {
- return false;
- },
- }
- }
-
- pub fn trySkipTypeScriptTypeArgumentsWithBacktracking(p: *P) bool {
- notimpl();
- // return false;
- }
- pub fn parsePrefix(p: *P, level: Level, errors: ?*DeferredErrors, flags: Expr.EFlags) Expr {
- return p._parsePrefix(level, errors orelse &DeferredErrors.None, flags);
- }
-
- pub fn appendPart(p: *P, parts: *List(js_ast.Part), stmts: []Stmt) !void {
- p.symbol_uses = SymbolUseMap.init(p.allocator);
- p.declared_symbols.deinit();
- p.declared_symbols = @TypeOf(p.declared_symbols).init(p.allocator);
- p.import_records_for_current_part.deinit();
- p.import_records_for_current_part = @TypeOf(p.import_records_for_current_part).init(p.allocator);
- p.scopes_for_current_part.deinit();
- p.scopes_for_current_part = @TypeOf(p.scopes_for_current_part).init(p.allocator);
- var opts = PrependTempRefsOpts{};
- var partStmts = List(Stmt).fromOwnedSlice(p.allocator, stmts);
- try p.visitStmtsAndPrependTempRefs(&partStmts, &opts);
-
- // Insert any relocated variable statements now
- if (p.relocated_top_level_vars.items.len > 0) {
- var already_declared = RefBoolMap.init(p.allocator);
- for (p.relocated_top_level_vars.items) |*local| {
- // Follow links because "var" declarations may be merged due to hoisting
- while (local.ref != null) {
- const link = p.symbols.items[local.ref.?.inner_index].link orelse break;
- if (link.isNull()) {
- break;
- }
- local.ref = link;
- }
- const ref = local.ref orelse continue;
- if (!already_declared.contains(ref)) {
- try already_declared.put(ref, true);
-
- const decls = try p.allocator.alloc(G.Decl, 1);
- decls[0] = Decl{
- .binding = p.b(B.Identifier{ .ref = ref }, local.loc),
- };
- try partStmts.append(p.s(S.Local{ .decls = decls }, local.loc));
- }
- }
- p.relocated_top_level_vars.deinit();
- p.relocated_top_level_vars = @TypeOf(p.relocated_top_level_vars).init(p.allocator);
-
- // Follow links because "var" declarations may be merged due to hoisting
-
- // while (true) {
- // const link = p.symbols.items[local.ref.inner_index].link;
- // }
- }
-
- if (partStmts.items.len > 0) {
- const _stmts = partStmts.toOwnedSlice();
- var part = js_ast.Part{
- .stmts = _stmts,
- .symbol_uses = p.symbol_uses,
- .declared_symbols = p.declared_symbols.toOwnedSlice(),
- .import_record_indices = p.import_records_for_current_part.toOwnedSlice(),
- .scopes = p.scopes_for_current_part.toOwnedSlice(),
- .can_be_removed_if_unused = p.stmtsCanBeRemovedIfUnused(_stmts),
- };
- try parts.append(part);
- }
- }
-
- pub fn bindingCanBeRemovedIfUnused(p: *P, binding: Binding) bool {
- switch (binding.data) {
- .b_array => |bi| {
- for (bi.items) |item| {
- if (!p.bindingCanBeRemovedIfUnused(item.binding)) {
- return false;
- }
-
- if (item.default_value) |default| {
- if (!p.exprCanBeRemovedIfUnused(default)) {
- return false;
- }
- }
- }
- },
- .b_object => |bi| {
- for (bi.properties) |property| {
- if (!property.flags.is_spread and !p.exprCanBeRemovedIfUnused(property.key)) {
- return false;
- }
-
- if (!p.bindingCanBeRemovedIfUnused(property.value)) {
- return false;
- }
-
- if (property.default_value) |default| {
- if (!p.exprCanBeRemovedIfUnused(default)) {
- return false;
- }
- }
- }
- },
- else => {},
- }
-
- return true;
- }
-
- pub fn stmtsCanBeRemovedIfUnused(p: *P, stmts: []Stmt) bool {
- for (stmts) |stmt| {
- switch (stmt.data) {
- // These never have side effects
- .s_function, .s_empty => {},
-
- // Let these be removed if they are unused. Note that we also need to
- // check if the imported file is marked as "sideEffects: false" before we
- // can remove a SImport statement. Otherwise the import must be kept for
- // its side effects.
- .s_import => |st| {},
- .s_class => |st| {
- if (!p.classCanBeRemovedIfUnused(&st.class)) {
- return false;
- }
- },
- .s_expr => |st| {
- if (st.does_not_affect_tree_shaking) {} else if (!p.exprCanBeRemovedIfUnused(st.value)) {
- return false;
- }
- },
- .s_local => |st| {
- for (st.decls) |decl| {
- if (!p.bindingCanBeRemovedIfUnused(decl.binding)) {
- return false;
- }
-
- if (decl.value) |decl_value| {
- if (!p.exprCanBeRemovedIfUnused(decl_value)) {
- return false;
- }
- }
- }
- },
-
- // Exports are tracked separately, so this isn't necessary
- .s_export_clause, .s_export_from => {},
-
- .s_export_default => |st| {
- switch (st.value) {
- .stmt => |s2| {
- switch (s2.data) {
- // These never have side effects
- .s_function => {},
- .s_class => |class| {
- if (!p.classCanBeRemovedIfUnused(&class.class)) {
- return false;
- }
- },
- else => {
- std.debug.panic("Unexpected type in export default: {s}", .{s2});
- },
- }
- },
- .expr => |exp| {
- if (!p.exprCanBeRemovedIfUnused(exp)) {
- return false;
- }
- },
- }
- },
- else => {
- return false;
- },
- }
- }
-
- return true;
- }
-
- pub fn visitStmtsAndPrependTempRefs(p: *P, stmts: *List(Stmt), opts: *PrependTempRefsOpts) !void {
- var old_temp_refs = p.temp_refs_to_declare;
- var old_temp_ref_count = p.temp_ref_count;
- p.temp_refs_to_declare.deinit();
- p.temp_refs_to_declare = @TypeOf(p.temp_refs_to_declare).init(p.allocator);
- p.temp_ref_count = 0;
-
- try p.visitStmts(stmts, opts.kind);
-
- // Prepend values for "this" and "arguments"
- if (opts.fn_body_loc != null) {
- // Capture "this"
- if (p.fn_only_data_visit.this_capture_ref) |ref| {
- try p.temp_refs_to_declare.append(TempRef{
- .ref = ref,
- .value = p.e(E.This{}, opts.fn_body_loc orelse p.panic("Internal error: Expected opts.fn_body_loc to exist", .{})),
- });
- }
- }
- }
-
- pub fn recordDeclaredSymbol(p: *P, ref: Ref) !void {
- try p.declared_symbols.append(js_ast.DeclaredSymbol{
- .ref = ref,
- .is_top_level = p.current_scope == p.module_scope,
- });
- }
-
- pub fn visitExpr(p: *P, expr: Expr) Expr {
- return p.visitExprInOut(expr, ExprIn{});
- }
-
- pub fn visitFunc(p: *P, func: *G.Fn, open_parens_loc: logger.Loc) void {
- const old_fn_or_arrow_data = p.fn_or_arrow_data_visit;
- defer p.fn_or_arrow_data_visit = old_fn_or_arrow_data;
- const old_fn_only_data = p.fn_only_data_visit;
- defer p.fn_only_data_visit = old_fn_only_data;
- p.fn_or_arrow_data_visit = FnOrArrowDataVisit{ .is_async = func.flags.is_async };
- p.fn_only_data_visit = FnOnlyDataVisit{ .is_this_nested = true, .arguments_ref = func.arguments_ref };
-
- if (func.name) |name| {
- p.recordDeclaredSymbol(name.ref.?) catch unreachable;
- const symbol_name = p.symbols.items[name.ref.?.inner_index].original_name;
- if (isEvalOrArguments(symbol_name)) {
- p.markStrictModeFeature(.eval_or_arguments, js_lexer.rangeOfIdentifier(&p.source, name.loc), symbol_name) catch unreachable;
- }
- }
-
- p.pushScopeForVisitPass(.function_args, open_parens_loc) catch unreachable;
- defer p.popScope();
- p.visitArgs(
- func.args,
- VisitArgsOpts{
- .has_rest_arg = func.flags.has_rest_arg,
- .body = func.body.?.stmts,
- .is_unique_formal_parameters = true,
- },
- );
-
- var body = func.body orelse p.panic("Expected visitFunc to have body {s}", .{func});
- p.pushScopeForVisitPass(.function_body, body.loc) catch unreachable;
- defer p.popScope();
- var stmts = List(Stmt).fromOwnedSlice(p.allocator, body.stmts);
- var temp_opts = PrependTempRefsOpts{ .kind = StmtsKind.fn_body, .fn_body_loc = body.loc };
- p.visitStmtsAndPrependTempRefs(&stmts, &temp_opts) catch unreachable;
-
- body.stmts = stmts.toOwnedSlice();
-
- func.body = body;
- }
-
- pub fn maybeKeepExprSymbolName(p: *P, expr: Expr, original_name: string, was_anonymous_named_expr: bool) Expr {
- return if (was_anonymous_named_expr) p.keepExprSymbolName(expr, original_name) else expr;
- }
-
- pub fn valueForThis(p: *P, loc: logger.Loc) ?Expr {
- // Substitute "this" if we're inside a static class property initializer
- if (p.fn_only_data_visit.this_class_static_ref) |*ref| {
- p.recordUsage(ref);
- return p.e(E.Identifier{ .ref = ref.* }, loc);
- }
-
- // oroigianlly was !=- modepassthrough
- if (!p.fn_only_data_visit.is_this_nested) {
- if (p.has_es_module_syntax) {
- // In an ES6 module, "this" is supposed to be undefined. Instead of
- // doing this at runtime using "fn.call(undefined)", we do it at
- // compile time using expression substitution here.
- return p.e(E.Undefined{}, loc);
- } else {
- // In a CommonJS module, "this" is supposed to be the same as "exports".
- // Instead of doing this at runtime using "fn.call(module.exports)", we
- // do it at compile time using expression substitution here.
- p.recordUsage(&p.exports_ref);
- return p.e(E.Identifier{ .ref = p.exports_ref }, loc);
- }
- }
-
- return null;
- }
-
- pub fn visitExprInOut(p: *P, expr: Expr, in: ExprIn) Expr {
- switch (expr.data) {
- .e_null, .e_super, .e_boolean, .e_big_int, .e_reg_exp, .e_new_target, .e_undefined => {},
- .e_string => |e_| {
- // If you're using this, you're probably not using 0-prefixed legacy octal notation
- // if e.LegacyOctalLoc.Start > 0 {
- },
- .e_number => |e_| {
- // idc about legacy octal loc
- },
- .e_this => |e_| {
- if (p.valueForThis(expr.loc)) |exp| {
- return exp;
- }
-
- // // Capture "this" inside arrow functions that will be lowered into normal
- // // function expressions for older language environments
- // if p.fnOrArrowDataVisit.isArrow && p.options.unsupportedJSFeatures.Has(compat.Arrow) && p.fnOnlyDataVisit.isThisNested {
- // return js_ast.Expr{Loc: expr.Loc, Data: &js_ast.EIdentifier{Ref: p.captureThis()}}, exprOut{}
- // }
- },
-
- .e_import_meta => |exp| {
- const is_delete_target = std.meta.activeTag(p.delete_target) == .e_import_meta and exp == p.delete_target.e_import_meta;
-
- if (p.define.dots.get("meta")) |meta| {
- for (meta) |define| {
- if (p.isDotDefineMatch(expr, define.parts)) {
- // Substitute user-specified defines
- return p.valueForDefine(expr.loc, in.assign_target, is_delete_target, &define.data);
- }
- }
- }
-
- if (!p.import_meta_ref.isNull()) {
- p.recordUsage(&p.import_meta_ref);
- return p.e(E.Identifier{ .ref = p.import_meta_ref }, expr.loc);
- }
- },
- .e_spread => |exp| {
- exp.value = p.visitExpr(exp.value);
- },
- .e_identifier => |e_| {
- const is_delete_target = @as(Expr.Tag, p.delete_target) == .e_identifier and e_ == p.delete_target.e_identifier;
-
- const name = p.loadNameFromRef(e_.ref);
- if (p.isStrictMode() and js_lexer.StrictModeReservedWords.has(name)) {
- p.markStrictModeFeature(.reserved_word, js_lexer.rangeOfIdentifier(&p.source, expr.loc), name) catch unreachable;
- }
-
- const result = p.findSymbol(expr.loc, name) catch unreachable;
-
- e_.must_keep_due_to_with_stmt = result.is_inside_with_scope;
- e_.ref = result.ref;
-
- // Handle assigning to a constant
- if (in.assign_target != .none and p.symbols.items[result.ref.inner_index].kind == .cconst) {
- const r = js_lexer.rangeOfIdentifier(&p.source, expr.loc);
- p.log.addRangeErrorFmt(p.source, r, p.allocator, "Cannot assign to {s} because it is a constant", .{name}) catch unreachable;
- }
-
- var original_name: ?string = null;
-
- // Substitute user-specified defines for unbound symbols
- if (p.symbols.items[e_.ref.inner_index].kind == .unbound and !result.is_inside_with_scope and !is_delete_target) {
- if (p.define.identifiers.get(name)) |def| {
- if (!def.isUndefined()) {
- const newvalue = p.valueForDefine(expr.loc, in.assign_target, is_delete_target, &def);
-
- // Don't substitute an identifier for a non-identifier if this is an
- // assignment target, since it'll cause a syntax error
- if (@as(Expr.Tag, newvalue.data) == .e_identifier or in.assign_target == .none) {
- return newvalue;
- }
-
- original_name = def.original_name;
- }
-
- // Copy the side effect flags over in case this expression is unused
- if (def.can_be_removed_if_unused) {
- e_.can_be_removed_if_unused = true;
- }
- if (def.call_can_be_unwrapped_if_unused and !p.options.ignore_dce_annotations) {
- e_.call_can_be_unwrapped_if_unused = true;
- }
- }
- }
-
- return p.handleIdentifier(expr.loc, e_, original_name, IdentifierOpts{
- .assign_target = in.assign_target,
- .is_delete_target = is_delete_target,
- .was_originally_identifier = true,
- });
- },
- .e_private_identifier => |e_| {
- p.panic("Unexpected private identifier. This is an internal error - not your fault.", .{});
- },
- .e_jsx_element => |e_| {
- const tag = tagger: {
- if (e_.tag) |_tag| {
- break :tagger p.visitExpr(_tag);
- } else {
- break :tagger p.jsxStringsToMemberExpression(expr.loc, p.options.jsx.fragment);
- }
- };
-
- // Visit properties
- var i: usize = 0;
- while (i < e_.properties.len) : (i += 1) {
- const property = e_.properties[i];
- if (property.kind != .spread) {
- e_.properties[i].key = p.visitExpr(e_.properties[i].key.?);
- }
-
- if (property.value != null) {
- e_.properties[i].value = p.visitExpr(e_.properties[i].value.?);
- }
-
- if (property.initializer != null) {
- e_.properties[i].initializer = p.visitExpr(e_.properties[i].initializer.?);
- }
- }
-
- // Arguments to createElement()
- const args = p.allocator.alloc(Expr, 1 + e_.children.len) catch unreachable;
- i = 1;
- if (e_.properties.len > 0) {
- args[0] = p.e(E.Object{ .properties = e_.properties }, expr.loc);
- } else {
- args[0] = p.e(E.Null{}, expr.loc);
- }
-
- for (e_.children) |child| {
- args[i] = p.visitExpr(child);
- i += 1;
- }
-
- // Call createElement()
- return p.e(E.Call{
- .target = p.jsxStringsToMemberExpression(expr.loc, p.options.jsx.factory),
- .args = args,
- // Enable tree shaking
- .can_be_unwrapped_if_unused = !p.options.ignore_dce_annotations,
- }, expr.loc);
- },
-
- .e_template => |e_| {
- if (e_.tag) |tag| {
- e_.tag = p.visitExpr(tag);
- }
-
- var i: usize = 0;
- while (i < e_.parts.len) : (i += 1) {
- e_.parts[i].value = p.visitExpr(e_.parts[i].value);
- }
- },
-
- .e_binary => |e_| {
- switch (e_.left.data) {
- // Special-case private identifiers
- .e_private_identifier => |private| {
- if (e_.op == .bin_in) {
- const name = p.loadNameFromRef(private.ref);
- const result = p.findSymbol(e_.left.loc, name) catch unreachable;
- private.ref = result.ref;
-
- // Unlike regular identifiers, there are no unbound private identifiers
- const symbol: Symbol = p.symbols.items[result.ref.inner_index];
- if (!Symbol.isKindPrivate(symbol.kind)) {
- const r = logger.Range{ .loc = e_.left.loc, .len = @intCast(i32, name.len) };
- p.log.addRangeErrorFmt(p.source, r, p.allocator, "Private name \"{s}\" must be declared in an enclosing class", .{name}) catch unreachable;
- }
-
- e_.right = p.visitExpr(e_.right);
- // privateSymbolNeedsToBeLowered
- return expr;
- }
- },
- else => {},
- }
-
- const is_call_target = @as(Expr.Tag, p.call_target) == .e_binary and e_ == p.call_target.e_binary;
- const is_stmt_expr = @as(Expr.Tag, p.stmt_expr_value) == .e_binary and e_ == p.stmt_expr_value.e_binary;
- const was_anonymous_named_expr = p.isAnonymousNamedExpr(e_.right);
-
- e_.left = p.visitExprInOut(e_.left, ExprIn{
- .assign_target = e_.op.binaryAssignTarget(),
- });
-
- // Mark the control flow as dead if the branch is never taken
- switch (e_.op) {
- .bin_logical_or => {
- const side_effects = SideEffects.toBoolean(e_.left.data);
- if (side_effects.ok and side_effects.value) {
- // "true || dead"
- const old = p.is_control_flow_dead;
- p.is_control_flow_dead = true;
- e_.right = p.visitExpr(e_.right);
- p.is_control_flow_dead = old;
- } else {
- e_.right = p.visitExpr(e_.right);
- }
- },
- .bin_logical_and => {
- const side_effects = SideEffects.toBoolean(e_.left.data);
- if (side_effects.ok and side_effects.value) {
- // "false && dead"
- const old = p.is_control_flow_dead;
- p.is_control_flow_dead = true;
- e_.right = p.visitExpr(e_.right);
- p.is_control_flow_dead = old;
- } else {
- e_.right = p.visitExpr(e_.right);
- }
- },
- .bin_nullish_coalescing => {
- const side_effects = SideEffects.toNullOrUndefined(e_.left.data);
- if (side_effects.ok and side_effects.value) {
- // "false && dead"
- const old = p.is_control_flow_dead;
- p.is_control_flow_dead = true;
- e_.right = p.visitExpr(e_.right);
- p.is_control_flow_dead = old;
- } else {
- e_.right = p.visitExpr(e_.right);
- }
- },
- else => {
- e_.right = p.visitExpr(e_.right);
- },
- }
-
- // Always put constants on the right for equality comparisons to help
- // reduce the number of cases we have to check during pattern matching. We
- // can only reorder expressions that do not have any side effects.
- switch (e_.op) {
- .bin_loose_eq, .bin_loose_ne, .bin_strict_eq, .bin_strict_ne => {
- if (SideEffects.isPrimitiveToReorder(e_.left.data) and !SideEffects.isPrimitiveToReorder(e_.right.data)) {
- const _left = e_.left;
- const _right = e_.right;
- e_.left = _right;
- e_.right = _left;
- }
- },
- else => {},
- }
-
- switch (e_.op) {
- .bin_comma => {
- // notimpl();
- },
- .bin_loose_eq => {
- const equality = SideEffects.eql(e_.left.data, e_.right.data);
- if (equality.ok) {
- return p.e(
- E.Boolean{ .value = equality.equal },
- expr.loc,
- );
- }
-
- // const after_op_loc = locAfterOp(e_.);
- // TODO: warn about equality check
- // TODO: warn about typeof string
-
- },
- .bin_strict_eq => {
- const equality = SideEffects.eql(e_.left.data, e_.right.data);
- if (equality.ok) {
- return p.e(E.Boolean{ .value = equality.ok }, expr.loc);
- }
-
- // const after_op_loc = locAfterOp(e_.);
- // TODO: warn about equality check
- // TODO: warn about typeof string
- },
- .bin_loose_ne => {
- const equality = SideEffects.eql(e_.left.data, e_.right.data);
- if (equality.ok) {
- return p.e(E.Boolean{ .value = !equality.ok }, expr.loc);
- }
- // const after_op_loc = locAfterOp(e_.);
- // TODO: warn about equality check
- // TODO: warn about typeof string
-
- // "x != void 0" => "x != null"
- if (@as(Expr.Tag, e_.right.data) == .e_undefined) {
- e_.right = p.e(E.Null{}, e_.right.loc);
- }
- },
- .bin_strict_ne => {
- const equality = SideEffects.eql(e_.left.data, e_.right.data);
- if (equality.ok) {
- return p.e(E.Boolean{ .value = !equality.ok }, expr.loc);
- }
- },
- .bin_nullish_coalescing => {
- const nullorUndefined = SideEffects.toNullOrUndefined(e_.left.data);
- if (!nullorUndefined.value) {
- return e_.left;
- } else if (nullorUndefined.side_effects == .no_side_effects) {
- // TODO:
- // "(null ?? fn)()" => "fn()"
- // "(null ?? this.fn)" => "this.fn"
- // "(null ?? this.fn)()" => "(0, this.fn)()"
-
- }
- },
- .bin_logical_or => {
- const side_effects = SideEffects.toBoolean(e_.left.data);
- if (side_effects.ok and side_effects.value) {
- return e_.left;
- } else if (side_effects.ok) {
- // TODO:
- // "(0 || fn)()" => "fn()"
- // "(0 || this.fn)" => "this.fn"
- // "(0 || this.fn)()" => "(0, this.fn)()"
- }
- },
- .bin_logical_and => {
- const side_effects = SideEffects.toBoolean(e_.left.data);
- if (side_effects.ok) {
- return e_.left;
- }
-
- // TODO:
- // "(1 && fn)()" => "fn()"
- // "(1 && this.fn)" => "this.fn"
- // "(1 && this.fn)()" => "(0, this.fn)()"
- },
- .bin_add => {
- if (p.should_fold_numeric_constants) {
- if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
- return p.e(E.Number{ .value = vals[0] + vals[1] }, expr.loc);
- }
- }
-
- // TODO: fold string addition
- },
- .bin_sub => {
- if (p.should_fold_numeric_constants) {
- if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
- return p.e(E.Number{ .value = vals[0] - vals[1] }, expr.loc);
- }
- }
- },
- .bin_mul => {
- if (p.should_fold_numeric_constants) {
- if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
- return p.e(E.Number{ .value = vals[0] * vals[1] }, expr.loc);
- }
- }
- },
- .bin_div => {
- if (p.should_fold_numeric_constants) {
- if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
- return p.e(E.Number{ .value = vals[0] / vals[1] }, expr.loc);
- }
- }
- },
- .bin_rem => {
- if (p.should_fold_numeric_constants) {
- if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
- // is this correct?
- return p.e(E.Number{ .value = std.math.mod(f64, vals[0], vals[1]) catch 0.0 }, expr.loc);
- }
- }
- },
- .bin_pow => {
- if (p.should_fold_numeric_constants) {
- if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
- return p.e(E.Number{ .value = std.math.pow(f64, vals[0], vals[1]) }, expr.loc);
- }
- }
- },
- .bin_shl => {
- // TODO:
- // if (p.should_fold_numeric_constants) {
- // if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
- // return p.e(E.Number{ .value = ((@floatToInt(i32, vals[0]) << @floatToInt(u32, vals[1])) & 31) }, expr.loc);
- // }
- // }
- },
- .bin_shr => {
- // TODO:
- // if (p.should_fold_numeric_constants) {
- // if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
- // return p.e(E.Number{ .value = ((@floatToInt(i32, vals[0]) >> @floatToInt(u32, vals[1])) & 31) }, expr.loc);
- // }
- // }
- },
- .bin_u_shr => {
- // TODO:
- // if (p.should_fold_numeric_constants) {
- // if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
- // return p.e(E.Number{ .value = ((@floatToInt(i32, vals[0]) >> @floatToInt(u32, vals[1])) & 31) }, expr.loc);
- // }
- // }
- },
- .bin_bitwise_and => {
- // TODO:
- // if (p.should_fold_numeric_constants) {
- // if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
- // return p.e(E.Number{ .value = ((@floatToInt(i32, vals[0]) >> @floatToInt(u32, vals[1])) & 31) }, expr.loc);
- // }
- // }
- },
- .bin_bitwise_or => {
- // TODO:
- // if (p.should_fold_numeric_constants) {
- // if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
- // return p.e(E.Number{ .value = ((@floatToInt(i32, vals[0]) >> @floatToInt(u32, vals[1])) & 31) }, expr.loc);
- // }
- // }
- },
- .bin_bitwise_xor => {
- // TODO:
- // if (p.should_fold_numeric_constants) {
- // if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
- // return p.e(E.Number{ .value = ((@floatToInt(i32, vals[0]) >> @floatToInt(u32, vals[1])) & 31) }, expr.loc);
- // }
- // }
- },
- // ---------------------------------------------------------------------------------------------------
- // ---------------------------------------------------------------------------------------------------
- // ---------------------------------------------------------------------------------------------------
- // ---------------------------------------------------------------------------------------------------
- .bin_assign => {
-
- // Optionally preserve the name
- if (@as(Expr.Tag, e_.left.data) == .e_identifier) {
- e_.right = p.maybeKeepExprSymbolName(e_.right, p.symbols.items[e_.left.data.e_identifier.ref.inner_index].original_name, was_anonymous_named_expr);
- }
- },
- .bin_add_assign => {
- // notimpl();
- },
- .bin_sub_assign => {
- // notimpl();
- },
- .bin_mul_assign => {
- // notimpl();
- },
- .bin_div_assign => {
- // notimpl();
- },
- .bin_rem_assign => {
- // notimpl();
- },
- .bin_pow_assign => {
- // notimpl();
- },
- .bin_shl_assign => {
- // notimpl();
- },
- .bin_shr_assign => {
- // notimpl();
- },
- .bin_u_shr_assign => {
- // notimpl();
- },
- .bin_bitwise_or_assign => {
- // notimpl();
- },
- .bin_bitwise_and_assign => {
- // notimpl();
- },
- .bin_bitwise_xor_assign => {
- // notimpl();
- },
- .bin_nullish_coalescing_assign => {
- // notimpl();
- },
- .bin_logical_and_assign => {
- // notimpl();
- },
- .bin_logical_or_assign => {
- // notimpl();
- },
- else => {},
- }
- },
- .e_index => |e_| {
- const is_call_target = std.meta.activeTag(p.call_target) == .e_index and e_ == p.call_target.e_index;
- const is_delete_target = std.meta.activeTag(p.delete_target) == .e_index and e_ == p.delete_target.e_index;
-
- const target = p.visitExprInOut(e_.target, ExprIn{
- // this is awkward due to a zig compiler bug
- .has_chain_parent = (e_.optional_chain orelse js_ast.OptionalChain.start) == js_ast.OptionalChain.ccontinue,
- });
- e_.target = target;
-
- if (e_.optional_chain == null and @as(Expr.Tag, e_.index.data) == .e_string) {
- if (p.maybeRewritePropertyAccess(
- expr.loc,
- in.assign_target,
- is_delete_target,
- e_.target,
- p.lexer.utf16ToString(e_.index.data.e_string.value),
- e_.index.loc,
- is_call_target,
- )) |val| {
- return val;
- }
- }
-
- // Create an error for assigning to an import namespace when bundling. Even
- // though this is a run-time error, we make it a compile-time error when
- // bundling because scope hoisting means these will no longer be run-time
- // errors.
- if ((in.assign_target != .none or is_delete_target) and @as(Expr.Tag, e_.target.data) == .e_identifier) {
- const r = js_lexer.rangeOfIdentifier(&p.source, e_.target.loc);
- p.log.addRangeErrorFmt(
- p.source,
- r,
- p.allocator,
- "Cannot assign to property on import \"{s}\"",
- .{p.symbols.items[e_.target.data.e_identifier.ref.inner_index].original_name},
- ) catch unreachable;
- }
-
- return p.e(e_, expr.loc);
- },
- .e_unary => |e_| {
- switch (e_.op) {
- .un_typeof => {
- e_.value = p.visitExprInOut(e_.value, ExprIn{ .assign_target = e_.op.unaryAssignTarget() });
-
- if (SideEffects.toTypeof(e_.value.data)) |typeof| {
- return p.e(E.String{ .value = p.lexer.stringToUTF16(typeof) }, expr.loc);
- }
- },
- .un_delete => {
- e_.value = p.visitExprInOut(e_.value, ExprIn{ .has_chain_parent = true });
- },
- else => {
- e_.value = p.visitExprInOut(e_.value, ExprIn{ .assign_target = e_.op.unaryAssignTarget() });
-
- // Post-process the unary expression
-
- switch (e_.op) {
- .un_not => {
- const side_effects = SideEffects.toBoolean(e_.value.data);
- if (side_effects.ok) {
- return p.e(E.Boolean{ .value = !side_effects.value }, expr.loc);
- }
-
- // maybe won't do this idk
- if (Expr.maybeSimplifyNot(&e_.value, p.allocator)) |exp| {
- return exp;
- }
- },
- .un_void => {
- if (p.exprCanBeRemovedIfUnused(e_.value)) {
- return p.e(E.Undefined{}, e_.value.loc);
- }
- },
- .un_pos => {
- if (SideEffects.toNumber(e_.value.data)) |num| {
- return p.e(E.Number{ .value = num }, expr.loc);
- }
- },
- .un_neg => {
- if (SideEffects.toNumber(e_.value.data)) |num| {
- return p.e(E.Number{ .value = -num }, expr.loc);
- }
- },
-
- ////////////////////////////////////////////////////////////////////////////////
-
- .un_pre_dec => {
- // TODO: private fields
- },
- .un_pre_inc => {
- // TODO: private fields
- },
- .un_post_dec => {
- // TODO: private fields
- },
- .un_post_inc => {
- // TODO: private fields
- },
- else => {},
- }
- },
- }
- },
- .e_dot => |e_| {
- const is_delete_target = @as(Expr.Tag, p.delete_target) == .e_dot and e_ == p.delete_target.e_dot;
- const is_call_target = @as(Expr.Tag, p.call_target) == .e_dot and e_ == p.call_target.e_dot;
-
- if (p.define.dots.get(e_.name)) |parts| {
- for (parts) |define| {
- if (p.isDotDefineMatch(expr, define.parts)) {
- // Substitute user-specified defines
- if (!define.data.isUndefined()) {
- // TODO: check this doesn't crash due to the pointer no longer being allocated
- return p.valueForDefine(expr.loc, in.assign_target, is_delete_target, &define.data);
- }
-
- // Copy the side effect flags over in case this expression is unused
- if (define.data.can_be_removed_if_unused) {
- e_.can_be_removed_if_unused = true;
- }
-
- if (define.data.call_can_be_unwrapped_if_unused and !p.options.ignore_dce_annotations) {
- e_.call_can_be_unwrapped_if_unused = true;
- }
-
- break;
- }
- }
- }
-
- // Track ".then().catch()" chains
- if (is_call_target and @as(Expr.Tag, p.then_catch_chain.next_target) == .e_dot and p.then_catch_chain.next_target.e_dot == e_) {
- if (strings.eql(e_.name, "catch")) {
- p.then_catch_chain = ThenCatchChain{
- .next_target = e_.target.data,
- .has_catch = true,
- };
- } else if (strings.eql(e_.name, "then")) {
- p.then_catch_chain = ThenCatchChain{
- .next_target = e_.target.data,
- .has_catch = p.then_catch_chain.has_catch or p.then_catch_chain.has_multiple_args,
- };
- }
- }
-
- e_.target = p.visitExpr(e_.target);
- if (e_.optional_chain == null) {
- if (p.maybeRewritePropertyAccess(
- expr.loc,
- in.assign_target,
- is_delete_target,
- e_.target,
- e_.name,
- e_.name_loc,
- is_call_target,
- )) |_expr| {
- return _expr;
- }
- }
- },
- .e_if => |e_| {
- const is_call_target = (p.call_target) == .e_if and e_ == p.call_target.e_if;
-
- e_.test_ = p.visitExpr(e_.test_);
-
- const side_effects = SideEffects.toBoolean(e_.test_.data);
-
- if (side_effects.ok) {
- // Mark the control flow as dead if the branch is never taken
- if (side_effects.value) {
- // "true ? live : dead"
- e_.yes = p.visitExpr(e_.yes);
- const old = p.is_control_flow_dead;
- p.is_control_flow_dead = true;
- e_.no = p.visitExpr(e_.no);
- p.is_control_flow_dead = old;
- } else {
- // "false ? dead : live"
- const old = p.is_control_flow_dead;
- p.is_control_flow_dead = true;
- e_.yes = p.visitExpr(e_.yes);
- p.is_control_flow_dead = old;
- e_.no = p.visitExpr(e_.no);
- }
- } else {
- e_.yes = p.visitExpr(e_.yes);
- e_.no = p.visitExpr(e_.no);
- }
- },
- .e_await => |e_| {
- p.await_target = e_.value.data;
- e_.value = p.visitExpr(e_.value);
- },
- .e_yield => |e_| {
- if (e_.value) |val| {
- e_.value = p.visitExpr(val);
- }
- },
- .e_array => |e_| {
- if (in.assign_target != .none) {
- if (e_.comma_after_spread) |spread| {
- p.log.addRangeError(p.source, logger.Range{ .loc = spread, .len = 1 }, "Unexpected \",\" after rest pattern") catch unreachable;
- }
- }
-
- var has_spread = false;
- var i: usize = 0;
- while (i < e_.items.len) : (i += 1) {
- var item = e_.items[i];
- const data = item.data;
- switch (data) {
- .e_missing => {},
- .e_spread => |spread| {
- spread.value = p.visitExprInOut(spread.value, ExprIn{ .assign_target = in.assign_target });
- },
- .e_binary => |e2| {
- if (in.assign_target != .none and e2.op == .bin_assign) {
- const was_anonymous_named_expr = p.isAnonymousNamedExpr(e2.right);
- e2.left = p.visitExprInOut(e2.left, ExprIn{ .assign_target = .replace });
- e2.right = p.visitExpr(e2.right);
-
- if (@as(Expr.Tag, e2.left.data) == .e_identifier) {
- e2.right = p.maybeKeepExprSymbolName(
- e2.right,
- p.symbols.items[e2.left.data.e_identifier.ref.inner_index].original_name,
- was_anonymous_named_expr,
- );
- }
- } else {
- item = p.visitExprInOut(item, ExprIn{ .assign_target = in.assign_target });
- }
- },
- else => {
- item = p.visitExprInOut(item, ExprIn{ .assign_target = in.assign_target });
- },
- }
- e_.items[i] = item;
- }
- },
- .e_object => |e_| {
- if (in.assign_target != .none) {
- p.maybeCommaSpreadError(e_.comma_after_spread);
- var has_spread = false;
- var has_proto = false;
-
- var i: usize = 0;
- while (i < e_.properties.len) : (i += 1) {
- var property = e_.properties[i];
-
- if (property.kind != .spread) {
- const key = p.visitExpr(property.key orelse std.debug.panic("Expected property key", .{}));
- e_.properties[i].key = key;
-
- // Forbid duplicate "__proto__" properties according to the specification
- if (!property.flags.is_computed and !property.flags.was_shorthand and !property.flags.is_method and in.assign_target == .none and key.data.isStringValue() and strings.utf16EqlString(
- key.data.e_string.value,
- "__proto__",
- )) {
- if (has_proto) {
- const r = js_lexer.rangeOfIdentifier(&p.source, key.loc);
- p.log.addRangeError(p.source, r, "Cannot specify the \"__proto__\" property more than once per object") catch unreachable;
- }
- has_proto = true;
- }
- } else {
- has_spread = true;
- }
-
- // Extract the initializer for expressions like "({ a: b = c } = d)"
- if (in.assign_target != .none and property.initializer != null and property.value != null) {
- switch (property.value.?.data) {
- .e_binary => |bin| {
- if (bin.op == .bin_assign) {
- property.initializer = bin.right;
- property.value = bin.left;
- }
- },
- else => {},
- }
- }
-
- if (property.value != null) {
- property.value = p.visitExprInOut(property.value.?, ExprIn{ .assign_target = in.assign_target });
- }
-
- if (property.initializer != null) {
- const was_anonymous_named_expr = p.isAnonymousNamedExpr(property.initializer orelse unreachable);
- property.initializer = p.visitExprInOut(property.initializer.?, ExprIn{ .assign_target = in.assign_target });
-
- if (property.value) |val| {
- if (@as(Expr.Tag, val.data) == .e_identifier) {
- property.initializer = p.maybeKeepExprSymbolName(
- property.initializer orelse unreachable,
- p.symbols.items[val.data.e_identifier.ref.inner_index].original_name,
- was_anonymous_named_expr,
- );
- }
- }
- }
-
- // TODO: can we avoid htis copy
- e_.properties[i] = property;
- }
- }
- },
- .e_import => |e_| {
- const state = TransposeState{
- .is_await_target = if (p.await_target != null) p.await_target.?.e_import == e_ else false,
- .is_then_catch_target = e_ == p.then_catch_chain.next_target.e_import and p.then_catch_chain.has_catch,
- .loc = e_.expr.loc,
- };
-
- e_.expr = p.visitExpr(e_.expr);
- return p.import_transposer.maybeTransposeIf(e_.expr, state);
-
- // TODO: maybeTransposeIfExprChain
- },
- .e_call => |e_| {
- p.call_target = e_.target.data;
-
- p.then_catch_chain = ThenCatchChain{
- .next_target = e_.target.data,
- .has_multiple_args = e_.args.len >= 2,
- .has_catch = @as(Expr.Tag, p.then_catch_chain.next_target) == .e_call and p.then_catch_chain.next_target.e_call == e_ and p.then_catch_chain.has_catch,
- };
-
- // Prepare to recognize "require.resolve()" calls
- // const could_be_require_resolve = (e_.args.len == 1 and @as(
- // Expr.Tag,
- // e_.target.data,
- // ) == .e_dot and e_.target.data.e_dot.optional_chain == null and strings.eql(
- // e_.target.dat.e_dot.name,
- // "resolve",
- // ));
-
- e_.target = p.visitExprInOut(e_.target, ExprIn{
- .has_chain_parent = (e_.optional_chain orelse js_ast.OptionalChain.start) == .ccontinue,
- });
- // TODO: wan about import namespace call
- var has_spread = false;
- var i: usize = 0;
- while (i < e_.args.len) : (i += 1) {
- e_.args[i] = p.visitExpr(e_.args[i]);
- has_spread = has_spread or @as(Expr.Tag, e_.args[i].data) == .e_spread;
- }
-
- if (e_.optional_chain == null and @as(Expr.Tag, e_.target.data) == .e_identifier and e_.target.data.e_identifier.ref.eql(p.require_ref)) {
- // Heuristic: omit warnings inside try/catch blocks because presumably
- // the try/catch statement is there to handle the potential run-time
- // error from the unbundled require() call failing.
- if (e_.args.len == 1) {
- return p.require_transposer.maybeTransposeIf(e_.args[0], null);
- } else {
- const r = js_lexer.rangeOfIdentifier(&p.source, e_.target.loc);
- p.log.addRangeDebug(p.source, r, "This call to \"require\" will not be bundled because it has multiple arguments") catch unreachable;
- }
- }
-
- return expr;
- },
- .e_new => |e_| {
- e_.target = p.visitExpr(e_.target);
- // p.warnA
-
- var i: usize = 0;
- while (i < e_.args.len) : (i += 1) {
- e_.args[i] = p.visitExpr(e_.args[i]);
- }
- },
- .e_arrow => |e_| {
- const old_fn_or_arrow_data = p.fn_or_arrow_data_visit;
- p.fn_or_arrow_data_visit = FnOrArrowDataVisit{
- .is_arrow = true,
- .is_async = e_.is_async,
- };
- defer p.fn_or_arrow_data_visit = old_fn_or_arrow_data;
-
- // Mark if we're inside an async arrow function. This value should be true
- // even if we're inside multiple arrow functions and the closest inclosing
- // arrow function isn't async, as long as at least one enclosing arrow
- // function within the current enclosing function is async.
- const old_inside_async_arrow_fn = p.fn_only_data_visit.is_inside_async_arrow_fn;
- p.fn_only_data_visit.is_inside_async_arrow_fn = e_.is_async or p.fn_only_data_visit.is_inside_async_arrow_fn;
- defer p.fn_only_data_visit.is_inside_async_arrow_fn = old_inside_async_arrow_fn;
-
- p.pushScopeForVisitPass(.function_args, expr.loc) catch unreachable;
- defer p.popScope();
-
- p.visitArgs(e_.args, VisitArgsOpts{
- .has_rest_arg = e_.has_rest_arg,
- .body = e_.body.stmts,
- .is_unique_formal_parameters = true,
- });
-
- p.pushScopeForVisitPass(.function_body, e_.body.loc) catch unreachable;
- defer p.popScope();
-
- var stmts_list = List(Stmt).fromOwnedSlice(p.allocator, e_.body.stmts);
- var temp_opts = PrependTempRefsOpts{ .kind = StmtsKind.fn_body };
- p.visitStmtsAndPrependTempRefs(&stmts_list, &temp_opts) catch unreachable;
- e_.body.stmts = stmts_list.toOwnedSlice();
- },
- .e_function => |e_| {
- p.visitFunc(&e_.func, expr.loc);
- if (e_.func.name) |name| {
- return p.keepExprSymbolName(expr, p.symbols.items[name.ref.?.inner_index].original_name);
- }
- },
- .e_class => |e_| {
- // This might be wrong.
- _ = p.visitClass(expr.loc, e_);
- },
- else => {},
- }
- return expr;
- }
-
- const VisitArgsOpts = struct {
- body: []Stmt = &([_]Stmt{}),
- has_rest_arg: bool = false,
-
- // This is true if the function is an arrow function or a method
- is_unique_formal_parameters: bool = false,
- };
-
- pub fn visitArgs(p: *P, args: []G.Arg, opts: VisitArgsOpts) void {
- const strict_loc = fnBodyContainsUseStrict(opts.body);
- const has_simple_args = isSimpleParameterList(args, opts.has_rest_arg);
- var duplicate_args_check: ?StringBoolMap = null;
- // Section 15.2.1 Static Semantics: Early Errors: "It is a Syntax Error if
- // FunctionBodyContainsUseStrict of FunctionBody is true and
- // IsSimpleParameterList of FormalParameters is false."
- if (strict_loc != null and !has_simple_args) {
- p.log.addRangeError(p.source, p.source.rangeOfString(strict_loc.?), "Cannot use a \"use strict\" directive in a function with a non-simple parameter list") catch unreachable;
- }
-
- // Section 15.1.1 Static Semantics: Early Errors: "Multiple occurrences of
- // the same BindingIdentifier in a FormalParameterList is only allowed for
- // functions which have simple parameter lists and which are not defined in
- // strict mode code."
- if (opts.is_unique_formal_parameters or strict_loc != null or !has_simple_args or p.isStrictMode()) {
- duplicate_args_check = StringBoolMap.init(p.allocator);
- }
-
- var i: usize = 0;
- var duplicate_args_check_ptr: ?*StringBoolMap = if (duplicate_args_check != null) &duplicate_args_check.? else null;
-
- while (i < args.len) : (i += 1) {
- if (args[i].ts_decorators) |decs| {
- args[i].ts_decorators = p.visitTSDecorators(decs);
- }
-
- p.visitBinding(args[i].binding, duplicate_args_check_ptr);
- if (args[i].default) |default| {
- args[i].default = p.visitExpr(default);
- }
- }
- }
-
- pub fn visitTSDecorators(p: *P, decs: ExprNodeList) ExprNodeList {
- var i: usize = 0;
- while (i < decs.len) : (i += 1) {
- decs[i] = p.visitExpr(decs[i]);
- }
-
- return decs;
- }
-
- pub fn keepExprSymbolName(p: *P, _value: Expr, name: string) Expr {
- var exprs = p.allocator.alloc(Expr, 2) catch unreachable;
- exprs[0] = _value;
- exprs[1] = p.e(E.String{
- .value = p.lexer.stringToUTF16(name),
- }, _value.loc);
- var value = p.callRuntime(_value.loc, "__name", exprs);
-
- // Make sure tree shaking removes this if the function is never used
- value.data.e_call.can_be_unwrapped_if_unused = true;
- return value;
- }
-
- pub fn fnBodyContainsUseStrict(body: []Stmt) ?logger.Loc {
- for (body) |stmt| {
- switch (stmt.data) {
- .s_comment => {
- continue;
- },
- .s_directive => |dir| {
- if (strings.utf16EqlString(dir.value, "use strict")) {
- return stmt.loc;
- }
- },
- else => {},
- }
- }
-
- return null;
- }
-
- pub fn isSimpleParameterList(args: []G.Arg, has_rest_arg: bool) bool {
- if (has_rest_arg) {
- return false;
- }
-
- for (args) |arg| {
- if (@as(Binding.Tag, arg.binding.data) != .b_identifier or arg.default != null) {
- return false;
- }
- }
-
- return true;
- }
-
- pub fn classCanBeRemovedIfUnused(p: *P, class: *G.Class) bool {
- if (class.extends) |extends| {
- if (!p.exprCanBeRemovedIfUnused(extends)) {
- return false;
- }
- }
-
- for (class.properties) |property| {
- if (!p.exprCanBeRemovedIfUnused(property.key orelse unreachable)) {
- return false;
- }
-
- if (property.value) |val| {
- if (!p.exprCanBeRemovedIfUnused(val)) {
- return false;
- }
- }
-
- if (property.initializer) |val| {
- if (!p.exprCanBeRemovedIfUnused(val)) {
- return false;
- }
- }
- }
-
- return true;
- }
-
- // TODO:
- // When React Fast Refresh is enabled, anything that's a JSX component should not be removable
- // This is to improve the reliability of fast refresh between page loads.
- pub fn exprCanBeRemovedIfUnused(p: *P, expr: Expr) bool {
- switch (expr.data) {
- .e_null,
- .e_undefined,
- .e_missing,
- .e_boolean,
- .e_number,
- .e_big_int,
- .e_string,
- .e_this,
- .e_reg_exp,
- .e_function,
- .e_arrow,
- .e_import_meta,
- => {
- return true;
- },
-
- .e_dot => |ex| {
- return ex.can_be_removed_if_unused;
- },
- .e_class => |ex| {
- return p.classCanBeRemovedIfUnused(ex);
- },
- .e_identifier => |ex| {
- if (ex.must_keep_due_to_with_stmt) {
- return false;
- }
-
- // Unbound identifiers cannot be removed because they can have side effects.
- // One possible side effect is throwing a ReferenceError if they don't exist.
- // Another one is a getter with side effects on the global object:
- //
- // Object.defineProperty(globalThis, 'x', {
- // get() {
- // sideEffect();
- // },
- // });
- //
- // Be very careful about this possibility. It's tempting to treat all
- // identifier expressions as not having side effects but that's wrong. We
- // must make sure they have been declared by the code we are currently
- // compiling before we can tell that they have no side effects.
- //
- // Note that we currently ignore ReferenceErrors due to TDZ access. This is
- // incorrect but proper TDZ analysis is very complicated and would have to
- // be very conservative, which would inhibit a lot of optimizations of code
- // inside closures. This may need to be revisited if it proves problematic.
- if (ex.can_be_removed_if_unused or p.symbols.items[ex.ref.inner_index].kind != .unbound) {
- return true;
- }
- },
- .e_import_identifier => |ex| {
- // References to an ES6 import item are always side-effect free in an
- // ECMAScript environment.
- //
- // They could technically have side effects if the imported module is a
- // CommonJS module and the import item was translated to a property access
- // (which esbuild's bundler does) and the property has a getter with side
- // effects.
- //
- // But this is very unlikely and respecting this edge case would mean
- // disabling tree shaking of all code that references an export from a
- // CommonJS module. It would also likely violate the expectations of some
- // developers because the code *looks* like it should be able to be tree
- // shaken.
- //
- // So we deliberately ignore this edge case and always treat import item
- // references as being side-effect free.
- return true;
- },
- .e_if => |ex| {
- return p.exprCanBeRemovedIfUnused(ex.test_) and p.exprCanBeRemovedIfUnused(ex.yes) and p.exprCanBeRemovedIfUnused(ex.no);
- },
- .e_array => |ex| {
- for (ex.items) |item| {
- if (!p.exprCanBeRemovedIfUnused(item)) {
- return false;
- }
- }
-
- return true;
- },
- .e_object => |ex| {
- for (ex.properties) |property| {
-
- // The key must still be evaluated if it's computed or a spread
- if (property.kind == .spread or property.flags.is_computed) {
- return false;
- }
-
- if (property.value) |val| {
- if (!p.exprCanBeRemovedIfUnused(val)) {
- return false;
- }
- }
- }
- return true;
- },
- .e_call => |ex| {
- // A call that has been marked "__PURE__" can be removed if all arguments
- // can be removed. The annotation causes us to ignore the target.
- if (ex.can_be_unwrapped_if_unused) {
- for (ex.args) |arg| {
- if (!p.exprCanBeRemovedIfUnused(arg)) {
- return false;
- }
- }
- }
-
- return true;
- },
- .e_new => |ex| {
- // A call that has been marked "__PURE__" can be removed if all arguments
- // can be removed. The annotation causes us to ignore the target.
- if (ex.can_be_unwrapped_if_unused) {
- for (ex.args) |arg| {
- if (!p.exprCanBeRemovedIfUnused(arg)) {
- return false;
- }
- }
- }
-
- return true;
- },
- .e_unary => |ex| {
- switch (ex.op) {
- .un_typeof, .un_void, .un_not => {
- return p.exprCanBeRemovedIfUnused(ex.value);
- },
- else => {},
- }
- },
- .e_binary => |ex| {
- switch (ex.op) {
- .bin_strict_eq, .bin_strict_ne, .bin_comma, .bin_logical_or, .bin_logical_and, .bin_nullish_coalescing => {
- return p.exprCanBeRemovedIfUnused(ex.left) and p.exprCanBeRemovedIfUnused(ex.right);
- },
- else => {},
- }
- },
- else => {},
- }
-
- return false;
- }
-
- // EDot nodes represent a property access. This function may return an
- // expression to replace the property access with. It assumes that the
- // target of the EDot expression has already been visited.
- pub fn maybeRewritePropertyAccess(
- p: *P,
- loc: logger.Loc,
- assign_target: js_ast.AssignTarget,
- is_delete_target: bool,
- target: js_ast.Expr,
- name: string,
- name_loc: logger.Loc,
- is_call_target: bool,
- ) ?Expr {
- if (@as(Expr.Tag, target.data) == .e_identifier) {
- const id = target.data.e_identifier;
-
- // Rewrite property accesses on explicit namespace imports as an identifier.
- // This lets us replace them easily in the printer to rebind them to
- // something else without paying the cost of a whole-tree traversal during
- // module linking just to rewrite these EDot expressions.
- if (p.import_items_for_namespace.get(id.ref)) |*import_items| {
- var item: LocRef = undefined;
-
- if (!import_items.contains(name)) {
- item = LocRef{ .loc = name_loc, .ref = p.newSymbol(.import, name) catch unreachable };
- p.module_scope.generated.append(item.ref orelse unreachable) catch unreachable;
-
- import_items.put(name, item) catch unreachable;
- p.is_import_item.put(item.ref orelse unreachable, true) catch unreachable;
-
- var symbol = p.symbols.items[item.ref.?.inner_index];
- // Mark this as generated in case it's missing. We don't want to
- // generate errors for missing import items that are automatically
- // generated.
- symbol.import_item_status = .generated;
- } else {
- item = import_items.get(name) orelse unreachable;
- }
-
- // Undo the usage count for the namespace itself. This is used later
- // to detect whether the namespace symbol has ever been "captured"
- // or whether it has just been used to read properties off of.
- //
- // The benefit of doing this is that if both this module and the
- // imported module end up in the same module group and the namespace
- // symbol has never been captured, then we don't need to generate
- // any code for the namespace at all.
- p.ignoreUsage(id.ref);
-
- // Track how many times we've referenced this symbol
- p.recordUsage(&item.ref.?);
- var ident = p.allocator.create(E.Identifier) catch unreachable;
- ident.ref = item.ref.?;
-
- return p.handleIdentifier(name_loc, ident, name, IdentifierOpts{
- .assign_target = assign_target,
- .is_delete_target = is_delete_target,
- // If this expression is used as the target of a call expression, make
- // sure the value of "this" is preserved.
- .was_originally_identifier = false,
- });
- }
-
- if (is_call_target and id.ref.eql(p.module_ref) and strings.eql(name, "require")) {
- p.ignoreUsage(p.module_ref);
- p.recordUsage(&p.require_ref);
- return p.e(E.Identifier{ .ref = p.require_ref }, name_loc);
- }
-
- // If this is a known enum value, inline the value of the enum
- if (p.options.ts) {
- if (p.known_enum_values.get(id.ref)) |enum_value_map| {
- if (enum_value_map.get(name)) |enum_value| {
- return p.e(E.Number{ .value = enum_value }, loc);
- }
- }
- }
- }
-
- return null;
- }
-
- pub fn ignoreUsage(p: *P, ref: Ref) void {
- if (!p.is_control_flow_dead) {
- p.symbols.items[ref.inner_index].use_count_estimate = std.math.max(p.symbols.items[ref.inner_index].use_count_estimate - 1, 0);
- var use = p.symbol_uses.get(ref) orelse p.panic("Expected symbol_uses to exist {s}\n{s}", .{ ref, p.symbol_uses });
- use.count_estimate = std.math.max(use.count_estimate - 1, 0);
- if (use.count_estimate == 0) {
- _ = p.symbol_uses.remove(ref);
- } else {
- p.symbol_uses.putAssumeCapacity(ref, use);
- }
- }
-
- // Don't roll back the "tsUseCounts" increment. This must be counted even if
- // the value is ignored because that's what the TypeScript compiler does.
- }
-
- pub fn visitAndAppendStmt(p: *P, stmts: *List(Stmt), stmt: *Stmt) !void {
- switch (stmt.data) {
- // These don't contain anything to traverse
-
- .s_debugger, .s_empty, .s_comment => {},
- .s_type_script => |data| {
- // Erase TypeScript constructs from the output completely
- return;
- },
- .s_directive => |data| {
- // if p.isStrictMode() && s.LegacyOctalLoc.Start > 0 {
- // p.markStrictModeFeature(legacyOctalEscape, p.source.RangeOfLegacyOctalEscape(s.LegacyOctalLoc), "")
- // }
- return;
- },
- .s_import => |data| {
- try p.recordDeclaredSymbol(data.namespace_ref);
-
- if (data.default_name) |default_name| {
- try p.recordDeclaredSymbol(default_name.ref orelse unreachable);
- }
-
- if (data.items.len > 0) {
- for (data.items) |*item| {
- try p.recordDeclaredSymbol(item.name.ref orelse unreachable);
- }
- }
- },
- .s_export_clause => |data| {
- // "export {foo}"
- var end: usize = 0;
- for (data.items) |*item| {
- const name = p.loadNameFromRef(item.name.ref orelse unreachable);
- const symbol = try p.findSymbol(item.alias_loc, name);
- const ref = symbol.ref;
-
- if (p.symbols.items[ref.inner_index].kind == .unbound) {
- // Silently strip exports of non-local symbols in TypeScript, since
- // those likely correspond to type-only exports. But report exports of
- // non-local symbols as errors in JavaScript.
- if (!p.options.ts) {
- const r = js_lexer.rangeOfIdentifier(&p.source, item.name.loc);
- try p.log.addRangeErrorFmt(p.source, r, p.allocator, "\"{s}\" is not declared in this file", .{name});
- continue;
- }
- continue;
- }
-
- item.name.ref = ref;
- data.items[end] = item.*;
- end += 1;
- }
- // esbuild: "Note: do not remove empty export statements since TypeScript uses them as module markers"
- // jarred: does that mean we can remove them here, since we're not bundling for production?
- data.items = data.items[0..end];
- },
- .s_export_from => |data| {
- // "export {foo} from 'path'"
- const name = p.loadNameFromRef(data.namespace_ref);
- data.namespace_ref = try p.newSymbol(.other, name);
- try p.current_scope.generated.append(data.namespace_ref);
- try p.recordDeclaredSymbol(data.namespace_ref);
-
- // This is a re-export and the symbols created here are used to reference
- for (data.items) |*item| {
- const _name = p.loadNameFromRef(item.name.ref orelse unreachable);
- const ref = try p.newSymbol(.other, _name);
- try p.current_scope.generated.append(data.namespace_ref);
- try p.recordDeclaredSymbol(data.namespace_ref);
- item.name.ref = ref;
- }
- },
- .s_export_star => |data| {
- // "export {foo} from 'path'"
- const name = p.loadNameFromRef(data.namespace_ref);
- data.namespace_ref = try p.newSymbol(.other, name);
- try p.current_scope.generated.append(data.namespace_ref);
- try p.recordDeclaredSymbol(data.namespace_ref);
-
- // "export * as ns from 'path'"
- if (data.alias) |alias| {
- // "import * as ns from 'path'"
- // "export {ns}"
-
- // jarred: For now, just always do this transform.
- // because Safari doesn't support it and I've seen cases where this breaks
- // TODO: backport unsupportedJSFeatures map
- p.recordUsage(&data.namespace_ref);
- try stmts.ensureCapacity(stmts.items.len + 2);
- stmts.appendAssumeCapacity(p.s(S.Import{ .namespace_ref = data.namespace_ref, .star_name_loc = alias.loc, .import_record_index = data.import_record_index }, stmt.loc));
-
- var items = try List(js_ast.ClauseItem).initCapacity(p.allocator, 1);
- items.appendAssumeCapacity(js_ast.ClauseItem{ .alias = alias.original_name, .original_name = alias.original_name, .alias_loc = alias.loc, .name = LocRef{ .loc = alias.loc, .ref = data.namespace_ref } });
- stmts.appendAssumeCapacity(p.s(S.ExportClause{ .items = items.toOwnedSlice(), .is_single_line = true }, stmt.loc));
- }
- },
- .s_export_default => |data| {
- try p.recordDeclaredSymbol(data.default_name.ref orelse unreachable);
-
- switch (data.value) {
- .expr => |*expr| {
- const was_anonymous_named_expr = expr.isAnonymousNamed();
- data.value.expr = p.visitExpr(expr.*);
-
- // // Optionally preserve the name
- data.value.expr = p.maybeKeepExprSymbolName(expr.*, "default", was_anonymous_named_expr);
-
- // Discard type-only export default statements
- if (p.options.ts) {
- switch (expr.data) {
- .e_identifier => |ident| {
- const symbol = p.symbols.items[ident.ref.inner_index];
- if (symbol.kind == .unbound) {
- if (p.local_type_names.get(symbol.original_name)) |local_type| {
- if (local_type) {
- return;
- }
- }
- }
- },
- else => {},
- }
- }
- },
-
- .stmt => |s2| {
- switch (s2.data) {
- .s_function => |func| {
- var name: string = undefined;
- if (func.func.name) |func_loc| {
- name = p.symbols.items[func_loc.ref.?.inner_index].original_name;
- } else {
- func.func.name = data.default_name;
- name = "default";
- }
-
- p.visitFunc(&func.func, func.func.open_parens_loc);
- stmts.append(stmt.*) catch unreachable;
-
- if (func.func.name) |name_ref| {
- // TODO-REACT-REFRESH-SPOT
- stmts.append(p.keepStmtSymbolName(name_ref.loc, name_ref.ref.?, name)) catch unreachable;
- }
- },
- .s_class => |class| {
- var shadow_ref = p.visitClass(s2.loc, &class.class);
- stmts.appendSlice(p.lowerClass(js_ast.StmtOrExpr{ .stmt = stmt.* }, shadow_ref)) catch unreachable;
- },
- else => {},
- }
- },
- }
- },
- .s_export_equals => |data| {
- // "module.exports = value"
- stmts.append(
- Expr.assignStmt(
- p.e(
- E.Dot{
- .target = p.e(
- E.Identifier{
- .ref = p.module_ref,
- },
- stmt.loc,
- ),
- .name = "exports",
- .name_loc = stmt.loc,
- },
- stmt.loc,
- ),
- p.visitExpr(data.value),
- p.allocator,
- ),
- ) catch unreachable;
- p.recordUsage(&p.module_ref);
- },
- .s_break => |data| {
- if (data.label) |*label| {
- const name = p.loadNameFromRef(label.ref orelse p.panic("Expected label to have a ref", .{}));
- const res = p.findLabelSymbol(label.loc, name);
-
- label.ref = res.ref;
- } else if (p.fn_or_arrow_data_visit.is_inside_loop and !p.fn_or_arrow_data_visit.is_inside_switch) {
- const r = js_lexer.rangeOfIdentifier(&p.source, stmt.loc);
- p.log.addRangeError(p.source, r, "Cannot use \"break\" here") catch unreachable;
- }
- },
- .s_continue => |data| {
- if (data.label) |*label| {
- const name = p.loadNameFromRef(label.ref orelse p.panic("Expected continue label to have a ref", .{}));
- const res = p.findLabelSymbol(label.loc, name);
- label.ref = res.ref;
- if (res.found and !res.is_loop) {
- const r = js_lexer.rangeOfIdentifier(&p.source, stmt.loc);
- p.log.addRangeErrorFmt(p.source, r, p.allocator, "Cannot \"continue\" to label {s}", .{name}) catch unreachable;
- }
- } else if (!p.fn_or_arrow_data_visit.is_inside_loop) {
- const r = js_lexer.rangeOfIdentifier(&p.source, stmt.loc);
- p.log.addRangeError(p.source, r, "Cannot use \"continue\" here") catch unreachable;
- }
- },
- .s_label => |data| {
- p.pushScopeForVisitPass(.label, stmt.loc) catch unreachable;
- const name = p.loadNameFromRef(data.name.ref orelse unreachable);
- const ref = p.newSymbol(.label, name) catch unreachable;
- data.name.ref = ref;
- p.current_scope.label_ref = ref;
- switch (data.stmt.data) {
- .s_for, .s_for_in, .s_for_of, .s_while, .s_do_while => {
- p.current_scope.label_stmt_is_loop = true;
- },
- else => {},
- }
-
- data.stmt = p.visitSingleStmt(data.stmt, StmtsKind.none);
- p.popScope();
- },
- .s_local => |data| {
- for (data.decls) |*d| {
- p.visitBinding(d.binding, null);
-
- if (d.value != null) {
- var val = d.value orelse unreachable;
- const was_anonymous_named_expr = p.isAnonymousNamedExpr(val);
-
- val = p.visitExpr(val);
- // go version of defer would cause this to reset the variable
- // zig version of defer causes this to set it to the last value of val, at the end of the scope.
- defer d.value = val;
-
- // Optionally preserve the name
- switch (d.binding.data) {
- .b_identifier => |id| {
- val = p.maybeKeepExprSymbolName(
- val,
- p.symbols.items[id.ref.inner_index].original_name,
- was_anonymous_named_expr,
- );
- },
- else => {},
- }
- }
- }
-
- // Handle being exported inside a namespace
- if (data.is_export and p.enclosing_namespace_arg_ref != null) {
- for (data.decls) |*d| {
- if (d.value) |val| {
- p.recordUsage(&(p.enclosing_namespace_arg_ref orelse unreachable));
- // TODO: is it necessary to lowerAssign? why does esbuild do it _most_ of the time?
- stmts.append(p.s(S.SExpr{
- .value = Expr.assign(Binding.toExpr(&d.binding, p.to_expr_wrapper_namespace), val, p.allocator),
- }, stmt.loc)) catch unreachable;
- }
- }
-
- return;
- }
-
- // TODO: do we need to relocate vars? I don't think so.
- if (data.kind == .k_var) {}
- },
- .s_expr => |data| {
- p.stmt_expr_value = data.value.data;
- data.value = p.visitExpr(data.value);
-
- // TODO:
- // if (p.options.mangle_syntax) {
-
- // }
- },
- .s_throw => |data| {
- data.value = p.visitExpr(data.value);
- },
- .s_return => |data| {
- if (p.fn_or_arrow_data_visit.is_outside_fn_or_arrow) {
- const where = where: {
- if (p.es6_export_keyword.len > 0) {
- break :where p.es6_export_keyword;
- } else if (p.top_level_await_keyword.len > 0) {
- break :where p.top_level_await_keyword;
- } else {
- break :where logger.Range.None;
- }
- };
-
- if (where.len > 0) {
- p.log.addRangeError(p.source, where, "Top-level return cannot be used inside an ECMAScript module") catch unreachable;
- }
- }
-
- if (data.value) |val| {
- data.value = p.visitExpr(val);
-
- // "return undefined;" can safely just always be "return;"
- if (data.value != null and @as(Expr.Tag, data.value.?.data) == .e_undefined) {
- // Returning undefined is implicit
- data.value = null;
- }
- }
- },
- .s_block => |data| {
- {
- p.pushScopeForVisitPass(.block, stmt.loc) catch unreachable;
- defer p.popScope();
-
- // Pass the "is loop body" status on to the direct children of a block used
- // as a loop body. This is used to enable optimizations specific to the
- // topmost scope in a loop body block.
- const kind = if (std.meta.eql(p.loop_body, stmt.data)) StmtsKind.loop_body else StmtsKind.none;
- var _stmts = List(Stmt).init(p.allocator);
- p.visitStmts(&_stmts, kind) catch unreachable;
- data.stmts = _stmts.toOwnedSlice();
- }
-
- // trim empty statements
- if (data.stmts.len == 0) {
- stmts.append(p.s(S.Empty{}, stmt.loc)) catch unreachable;
- return;
- } else if (data.stmts.len == 1 and !statementCaresAboutScope(data.stmts[0])) {
- // Unwrap blocks containing a single statement
- stmts.append(data.stmts[0]) catch unreachable;
- return;
- }
- },
- .s_with => |data| {
- notimpl();
- },
- .s_while => |data| {
- data.test_ = p.visitExpr(data.test_);
- data.body = p.visitLoopBody(data.body);
-
- // TODO: simplify boolean expression
- },
- .s_do_while => |data| {
- data.test_ = p.visitExpr(data.test_);
- data.body = p.visitLoopBody(data.body);
-
- // TODO: simplify boolean expression
- },
- .s_if => |data| {
- data.test_ = p.visitExpr(data.test_);
-
- const effects = SideEffects.toBoolean(data.test_.data);
- if (effects.ok and !effects.value) {
- const old = p.is_control_flow_dead;
- defer p.is_control_flow_dead = old;
- p.is_control_flow_dead = true;
- data.yes = p.visitSingleStmt(data.yes, StmtsKind.none);
- } else {
- data.yes = p.visitSingleStmt(data.yes, StmtsKind.none);
- }
- },
- .s_for => |data| {
- {
- p.pushScopeForVisitPass(.block, stmt.loc) catch unreachable;
- defer p.popScope();
- if (data.init) |initst| {
- _ = p.visitForLoopInit(initst, false);
- }
-
- if (data.test_) |test_| {
- data.test_ = p.visitExpr(test_);
-
- // TODO: boolean with side effects
- }
-
- if (data.update) |update| {
- data.update = p.visitExpr(update);
- }
-
- data.body = p.visitLoopBody(data.body);
- }
- // TODO: Potentially relocate "var" declarations to the top level
-
- },
- .s_for_in => |data| {
- {
- p.pushScopeForVisitPass(.block, stmt.loc) catch unreachable;
- defer p.popScope();
- _ = p.visitForLoopInit(data.init, true);
- data.value = p.visitExpr(data.value);
- data.body = p.visitLoopBody(data.body);
-
- // TODO: do we need to this?
- // // Check for a variable initializer
- // if local, ok := s.Init.Data.(*js_ast.SLocal); ok && local.Kind == js_ast.LocalVar && len(local.Decls) == 1 {
- // decl := &local.Decls[0]
- // if id, ok := decl.Binding.Data.(*js_ast.BIdentifier); ok && decl.Value != nil {
- // p.markStrictModeFeature(forInVarInit, p.source.RangeOfOperatorBefore(decl.Value.Loc, "="), "")
-
- // // Lower for-in variable initializers in case the output is used in strict mode
- // stmts = append(stmts, js_ast.Stmt{Loc: stmt.Loc, Data: &js_ast.SExpr{Value: js_ast.Assign(
- // js_ast.Expr{Loc: decl.Binding.Loc, Data: &js_ast.EIdentifier{Ref: id.Ref}},
- // *decl.Value,
- // )}})
- // decl.Value = nil
- // }
- // }
- }
- },
- .s_for_of => |data| {
- p.pushScopeForVisitPass(.block, stmt.loc) catch unreachable;
- defer p.popScope();
- _ = p.visitForLoopInit(data.init, true);
- data.value = p.visitExpr(data.value);
- data.body = p.visitLoopBody(data.body);
-
- // TODO: do we need to do this?
- // // Potentially relocate "var" declarations to the top level
- // if init, ok := s.Init.Data.(*js_ast.SLocal); ok && init.Kind == js_ast.LocalVar {
- // if replacement, ok := p.maybeRelocateVarsToTopLevel(init.Decls, relocateVarsForInOrForOf); ok {
- // s.Init = replacement
- // }
- // }
-
- // p.lowerObjectRestInForLoopInit(s.Init, &s.Body)
- },
- .s_try => |data| {
- {
- p.pushScopeForVisitPass(.block, stmt.loc) catch unreachable;
- defer p.popScope();
- p.fn_or_arrow_data_visit.try_body_count += 1;
- defer p.fn_or_arrow_data_visit.try_body_count -= 1;
- var _stmts = List(Stmt).fromOwnedSlice(p.allocator, data.body);
- p.visitStmts(&_stmts, StmtsKind.none) catch unreachable;
- data.body = _stmts.toOwnedSlice();
- }
-
- if (data.catch_) |*catch_| {
- p.pushScopeForVisitPass(.block, catch_.loc) catch unreachable;
- defer p.popScope();
- var _stmts = List(Stmt).fromOwnedSlice(p.allocator, data.body);
- p.visitStmts(&_stmts, StmtsKind.none) catch unreachable;
- catch_.body = _stmts.toOwnedSlice();
- }
-
- if (data.finally) |*finally| {
- p.pushScopeForVisitPass(.block, finally.loc) catch unreachable;
- var _stmts = List(Stmt).fromOwnedSlice(p.allocator, data.body);
- p.visitStmts(&_stmts, StmtsKind.none) catch unreachable;
- finally.stmts = _stmts.toOwnedSlice();
- p.popScope();
- }
- },
- .s_switch => |data| {
- data.test_ = p.visitExpr(data.test_);
- {
- p.pushScopeForVisitPass(.block, data.body_loc) catch unreachable;
- defer p.popScope();
- var old_is_inside_Swsitch = p.fn_or_arrow_data_visit.is_inside_switch;
- p.fn_or_arrow_data_visit.is_inside_switch = true;
- defer p.fn_or_arrow_data_visit.is_inside_switch = old_is_inside_Swsitch;
- var i: usize = 0;
- while (i < data.cases.len) : (i += 1) {
- const case = data.cases[i];
- if (case.value) |val| {
- data.cases[i].value = p.visitExpr(val);
- // TODO: error messages
- // Check("case", *c.Value, c.Value.Loc)
- // p.warnAboutTypeofAndString(s.Test, *c.Value)
- }
- var _stmts = List(Stmt).fromOwnedSlice(p.allocator, case.body);
- p.visitStmts(&_stmts, StmtsKind.none) catch unreachable;
- data.cases[i].body = _stmts.toOwnedSlice();
- }
- }
- // TODO: duplicate case checker
-
- },
- .s_function => |data| {
- p.visitFunc(&data.func, data.func.open_parens_loc);
-
- // Handle exporting this function from a namespace
- if (data.func.flags.is_export and p.enclosing_namespace_arg_ref != null) {
- const enclosing_namespace_arg_ref = p.enclosing_namespace_arg_ref orelse unreachable;
- stmts.ensureUnusedCapacity(3) catch unreachable;
- stmts.appendAssumeCapacity(stmt.*);
- // i wonder if this will crash
- stmts.appendAssumeCapacity(Expr.assignStmt(p.e(E.Dot{
- .target = p.e(E.Identifier{ .ref = enclosing_namespace_arg_ref }, stmt.loc),
- .name = p.symbols.items[data.func.name.?.ref.?.inner_index].original_name,
- .name_loc = data.func.name.?.loc,
- }, stmt.loc), p.e(E.Identifier{ .ref = data.func.name.?.ref.? }, data.func.name.?.loc), p.allocator));
- } else {
- stmts.ensureUnusedCapacity(2) catch unreachable;
- stmts.appendAssumeCapacity(stmt.*);
- }
-
- stmts.appendAssumeCapacity(
- // i wonder if this will crash
- p.keepStmtSymbolName(
- data.func.name.?.loc,
- data.func.name.?.ref.?,
- p.symbols.items[data.func.name.?.ref.?.inner_index].original_name,
- ),
- );
- return;
- },
- .s_class => |data| {
- const shadow_ref = p.visitClass(stmt.loc, &data.class);
-
- // Remove the export flag inside a namespace
- const was_export_inside_namespace = data.is_export and p.enclosing_namespace_arg_ref != null;
- if (was_export_inside_namespace) {
- data.is_export = false;
- }
-
- // Lower class field syntax for browsers that don't support it
- stmts.appendSlice(p.lowerClass(js_ast.StmtOrExpr{ .stmt = stmt.* }, shadow_ref)) catch unreachable;
-
- // Handle exporting this class from a namespace
- if (was_export_inside_namespace) {
- stmts.appendAssumeCapacity(Expr.assignStmt(p.e(E.Dot{
- .target = p.e(E.Identifier{ .ref = p.enclosing_namespace_arg_ref.? }, stmt.loc),
- .name = p.symbols.items[data.class.class_name.?.ref.?.inner_index].original_name,
- .name_loc = data.class.class_name.?.loc,
- }, stmt.loc), p.e(E.Identifier{ .ref = data.class.class_name.?.ref.? }, data.class.class_name.?.loc), p.allocator));
- }
-
- return;
- },
- .s_enum => |data| {
- p.recordDeclaredSymbol(data.name.ref.?) catch unreachable;
- p.pushScopeForVisitPass(.entry, stmt.loc) catch unreachable;
- defer p.popScope();
- p.recordDeclaredSymbol(data.arg) catch unreachable;
-
- // Scan ahead for any variables inside this namespace. This must be done
- // ahead of time before visiting any statements inside the namespace
- // because we may end up visiting the uses before the declarations.
- // We need to convert the uses into property accesses on the namespace.
- for (data.values) |value| {
- if (!value.ref.isNull()) {
- p.is_exported_inside_namespace.put(value.ref, data.arg) catch unreachable;
- }
- }
-
- // Values without initializers are initialized to one more than the
- // previous value if the previous value is numeric. Otherwise values
- // without initializers are initialized to undefined.
- var next_numeric_value: f64 = 0.0;
- var has_numeric_value = true;
- var value_exprs = List(Expr).initCapacity(p.allocator, data.values.len) catch unreachable;
-
- // Track values so they can be used by constant folding. We need to follow
- // links here in case the enum was merged with a preceding namespace
- var values_so_far = std.StringHashMap(f64).init(p.allocator);
- p.known_enum_values.put(data.name.ref orelse p.panic("Expected data.name.ref", .{}), values_so_far) catch unreachable;
- p.known_enum_values.put(data.arg, values_so_far) catch unreachable;
-
- // We normally don't fold numeric constants because they might increase code
- // size, but it's important to fold numeric constants inside enums since
- // that's what the TypeScript compiler does.
- const old_should_fold_numeric_constants = p.should_fold_numeric_constants;
- p.should_fold_numeric_constants = true;
- defer p.should_fold_numeric_constants = old_should_fold_numeric_constants;
- for (data.values) |*enum_value| {
- // gotta allocate here so it lives after this function stack frame goes poof
- const name = p.lexer.utf16ToString(enum_value.name);
- var assign_target: Expr = undefined;
- var enum_value_type: EnumValueType = EnumValueType.unknown;
- if (enum_value.value != null) {
- enum_value.value = p.visitExpr(enum_value.value.?);
- switch (enum_value.value.?.data) {
- .e_number => |num| {
- values_so_far.put(name, num.value) catch unreachable;
- enum_value_type = .numeric;
- next_numeric_value = num.value + 1.0;
- },
- .e_string => |str| {
- enum_value_type = .string;
- },
- else => {},
- }
- } else if (enum_value_type == .numeric) {
- enum_value.value = p.e(E.Number{ .value = next_numeric_value }, enum_value.loc);
- values_so_far.put(name, next_numeric_value) catch unreachable;
- next_numeric_value += 1;
- } else {
- enum_value.value = p.e(E.Undefined{}, enum_value.loc);
- }
- // "Enum['Name'] = value"
-
- assign_target = Expr.assign(p.e(E.Index{
- .target = p.e(
- E.Identifier{ .ref = data.arg },
- enum_value.loc,
- ),
- .index = p.e(
- E.String{ .value = enum_value.name },
- enum_value.loc,
- ),
- }, enum_value.loc), enum_value.value orelse unreachable, p.allocator);
-
- p.recordUsage(&data.arg);
-
- // String-valued enums do not form a two-way map
- if (enum_value_type == .string) {
- value_exprs.append(assign_target) catch unreachable;
- } else {
- // "Enum[assignTarget] = 'Name'"
- value_exprs.append(Expr.assign(p.e(E.Index{
- .target = p.e(
- E.Identifier{ .ref = data.arg },
- enum_value.loc,
- ),
- .index = assign_target,
- }, enum_value.loc), p.e(E.String{ .value = enum_value.name }, enum_value.loc), p.allocator)) catch unreachable;
- }
- }
- p.recordUsage(&data.arg);
-
- var value_stmts = List(Stmt).initCapacity(p.allocator, value_exprs.items.len) catch unreachable;
- // Generate statements from expressions
-
- for (value_exprs.items) |expr| {
- value_stmts.appendAssumeCapacity(p.s(S.SExpr{ .value = expr }, expr.loc));
- }
- value_exprs.deinit();
- p.generateClosureForTypescriptNameSpaceOrEnum(
- stmts,
- stmt.loc,
- data.is_export,
- data.name.loc,
- data.name.ref.?,
- data.arg,
- value_stmts.toOwnedSlice(),
- );
- return;
- },
- .s_namespace => |data| {
- p.recordDeclaredSymbol(data.name.ref.?) catch unreachable;
-
- // Scan ahead for any variables inside this namespace. This must be done
- // ahead of time before visiting any statements inside the namespace
- // because we may end up visiting the uses before the declarations.
- // We need to convert the uses into property accesses on the namespace.
- for (data.stmts) |child_stmt| {
- switch (child_stmt.data) {
- .s_local => |local| {
- if (local.is_export) {
- p.markExportedDeclsInsideNamespace(data.arg, local.decls);
- }
- },
- else => {},
- }
- }
-
- var prepend_temp_refs = PrependTempRefsOpts{ .kind = StmtsKind.fn_body };
- var prepend_list = List(Stmt).fromOwnedSlice(p.allocator, data.stmts);
-
- {
- const old_enclosing_namespace_arg_ref = p.enclosing_namespace_arg_ref;
- p.enclosing_namespace_arg_ref = data.arg;
- defer p.enclosing_namespace_arg_ref = old_enclosing_namespace_arg_ref;
- p.pushScopeForVisitPass(.entry, stmt.loc) catch unreachable;
- defer p.popScope();
- p.recordDeclaredSymbol(data.arg) catch unreachable;
- p.visitStmtsAndPrependTempRefs(&prepend_list, &prepend_temp_refs) catch unreachable;
- }
-
- p.generateClosureForTypescriptNameSpaceOrEnum(
- stmts,
- stmt.loc,
- data.is_export,
- data.name.loc,
- data.name.ref.?,
- data.arg,
- prepend_list.toOwnedSlice(),
- );
- return;
- },
- else => {
- notimpl();
- },
- }
-
- // if we get this far, it stays
- try stmts.append(stmt.*);
- }
-
- pub fn markExportedDeclsInsideNamespace(p: *P, ns_ref: Ref, decls: []G.Decl) void {
- notimpl();
- }
-
- pub fn generateClosureForTypescriptNameSpaceOrEnum(
- p: *P,
- stmts: *List(Stmt),
- stmt_loc: logger.Loc,
- is_export: bool,
- name_loc: logger.Loc,
- name_ref: Ref,
- arg_ref: Ref,
- stmts_inside_closure: []Stmt,
- ) void {
- notimpl();
- }
-
- pub fn lowerClass(p: *P, stmtorexpr: js_ast.StmtOrExpr, ref: Ref) []Stmt {
- switch (stmtorexpr) {
- .stmt => |stmt| {
- var stmts = p.allocator.alloc(Stmt, 1) catch unreachable;
- stmts[0] = stmt;
- return stmts;
- },
- .expr => |expr| {
- var stmts = p.allocator.alloc(Stmt, 1) catch unreachable;
- stmts[0] = p.s(S.SExpr{ .value = expr }, expr.loc);
- return stmts;
- },
- }
- }
-
- pub fn visitForLoopInit(p: *P, stmt: Stmt, is_in_or_of: bool) Stmt {
- switch (stmt.data) {
- .s_expr => |st| {
- const assign_target = if (is_in_or_of) js_ast.AssignTarget.replace else js_ast.AssignTarget.none;
- p.stmt_expr_value = st.value.data;
- st.value = p.visitExprInOut(st.value, ExprIn{ .assign_target = assign_target });
- },
- .s_local => |st| {
- for (st.decls) |*dec| {
- p.visitBinding(dec.binding, null);
- if (dec.value) |val| {
- dec.value = p.visitExpr(val);
- }
- }
- // s.Decls = p.lowerObjectRestInDecls(s.Decls)
- // s.Kind = p.selectLocalKind(s.Kind)
- },
- else => {
- p.panic("Unexpected stmt in visitForLoopInit: {s}", .{stmt});
- },
- }
-
- return stmt;
- }
-
- // pub fn maybeRelocateVarsToTopLevel(p: *P, decls: []G.Decl, mode: )
-
- pub fn wrapIdentifierNamespace(
- p: *P,
- loc: logger.Loc,
- ref: Ref,
- ) Expr {
- p.recordUsage(&(p.enclosing_namespace_arg_ref orelse unreachable));
-
- return p.e(E.Dot{
- .target = p.e(E.Identifier{ .ref = p.enclosing_namespace_arg_ref orelse unreachable }, loc),
- .name = p.symbols.items[ref.inner_index].original_name,
- .name_loc = loc,
- }, loc);
- }
-
- pub fn wrapIdentifierHoisting(
- p: *P,
- loc: logger.Loc,
- ref: Ref,
- ) Expr {
- p.relocated_top_level_vars.append(LocRef{ .loc = loc, .ref = ref }) catch unreachable;
- var _ref = ref;
- p.recordUsage(&_ref);
- return p.e(E.Identifier{ .ref = _ref }, loc);
- }
-
- pub fn isAnonymousNamedExpr(p: *P, expr: ExprNodeIndex) bool {
- switch (expr.data) {
- .e_arrow => {
- return true;
- },
- .e_function => |func| {
- return func.func.name == null;
- },
- .e_class => |class| {
- return class.class_name == null;
- },
- else => {
- return false;
- },
- }
- }
-
- pub fn valueForDefine(p: *P, loc: logger.Loc, assign_target: js_ast.AssignTarget, is_delete_target: bool, define_data: *const DefineData) Expr {
- switch (define_data.value) {
- .e_identifier => |ident| {
- return p.handleIdentifier(
- loc,
- ident,
- define_data.original_name.?,
- IdentifierOpts{
- .assign_target = assign_target,
- .is_delete_target = is_delete_target,
- .was_originally_identifier = true,
- },
- );
- },
- else => {},
- }
-
- return Expr{
- .data = define_data.value,
- .loc = loc,
- };
- }
-
- pub fn isDotDefineMatch(p: *P, expr: Expr, parts: []const string) bool {
- switch (expr.data) {
- .e_dot => |ex| {
- if (parts.len > 1) {
- // Intermediates must be dot expressions
- const last = parts.len - 1;
- return strings.eql(parts[last], ex.name) and ex.optional_chain == null and p.isDotDefineMatch(ex.target, parts[0..last]);
- }
- },
- .e_import_meta => |ex| {
- return parts.len == 2 and strings.eql(parts[0], "import") and strings.eql(parts[1], "meta");
- },
- .e_identifier => |ex| {
- // The last expression must be an identifier
- if (parts.len == 1) {
- const name = p.loadNameFromRef(ex.ref);
- if (!strings.eql(name, parts[0])) {
- return false;
- }
-
- const result = p.findSymbol(expr.loc, name) catch return false;
-
- // We must not be in a "with" statement scope
- if (result.is_inside_with_scope) {
- return false;
- }
-
- // The last symbol must be unbound
- return p.symbols.items[result.ref.inner_index].kind == .unbound;
- }
- },
- else => {},
- }
-
- return false;
- }
-
- pub fn visitBinding(p: *P, binding: BindingNodeIndex, duplicate_arg_check: ?*StringBoolMap) void {
- switch (binding.data) {
- .b_missing => {},
- .b_identifier => |bind| {
- p.recordDeclaredSymbol(bind.ref) catch unreachable;
- const name = p.symbols.items[bind.ref.inner_index].original_name;
- if (isEvalOrArguments(name)) {
- p.markStrictModeFeature(.eval_or_arguments, js_lexer.rangeOfIdentifier(&p.source, binding.loc), name) catch unreachable;
- }
-
- if (duplicate_arg_check) |dup| {
- const res = dup.getOrPut(name) catch unreachable;
- if (res.found_existing) {
- p.log.addRangeErrorFmt(
- p.source,
- js_lexer.rangeOfIdentifier(&p.source, binding.loc),
- p.allocator,
- "\"{s}\" cannot be bound multiple times in the same parameter list",
- .{name},
- ) catch unreachable;
- }
- res.entry.value = true;
- }
- },
- .b_array => |bind| {
- for (bind.items) |*item| {
- p.visitBinding(item.binding, duplicate_arg_check);
- if (item.default_value) |default_value| {
- const was_anonymous_named_expr = p.isAnonymousNamedExpr(default_value);
- item.default_value = p.visitExpr(default_value);
-
- switch (item.binding.data) {
- .b_identifier => |bind_| {
- item.default_value = p.maybeKeepExprSymbolName(
- item.default_value orelse unreachable,
- p.symbols.items[bind_.ref.inner_index].original_name,
- was_anonymous_named_expr,
- );
- },
- else => {},
- }
- }
- }
- },
- .b_object => |bind| {
- var i: usize = 0;
- while (i < bind.properties.len) : (i += 1) {
- var property = bind.properties[i];
- if (!property.flags.is_spread) {
- property.key = p.visitExpr(property.key);
- }
-
- p.visitBinding(property.value, duplicate_arg_check);
- if (property.default_value) |default_value| {
- const was_anonymous_named_expr = p.isAnonymousNamedExpr(default_value);
- property.default_value = p.visitExpr(default_value);
-
- switch (property.value.data) {
- .b_identifier => |bind_| {
- property.default_value = p.maybeKeepExprSymbolName(
- property.default_value orelse unreachable,
- p.symbols.items[bind_.ref.inner_index].original_name,
- was_anonymous_named_expr,
- );
- },
- else => {},
- }
- }
- bind.properties[i] = property;
- }
- },
- else => {
- p.panic("Unexpected binding {s}", .{binding});
- },
- }
- }
-
- pub fn visitLoopBody(p: *P, stmt: StmtNodeIndex) StmtNodeIndex {
- const old_is_inside_loop = p.fn_or_arrow_data_visit.is_inside_loop;
- p.fn_or_arrow_data_visit.is_inside_loop = true;
- defer p.fn_or_arrow_data_visit.is_inside_loop = old_is_inside_loop;
- p.loop_body = stmt.data;
- return p.visitSingleStmt(stmt, .loop_body);
- }
-
- pub fn visitSingleStmt(p: *P, stmt: Stmt, kind: StmtsKind) Stmt {
- const has_if_scope = has_if: {
- switch (stmt.data) {
- .s_function => |func| {
- break :has_if func.func.flags.has_if_scope;
- },
- else => {
- break :has_if false;
- },
- }
- };
-
- // Introduce a fake block scope for function declarations inside if statements
- if (has_if_scope) {
- p.pushScopeForVisitPass(.block, stmt.loc) catch unreachable;
- }
-
- var stmts = List(Stmt).initCapacity(p.allocator, 1) catch unreachable;
- stmts.append(stmt) catch unreachable;
- p.visitStmts(&stmts, kind) catch unreachable;
-
- if (has_if_scope) {
- p.popScope();
- }
-
- return p.stmtsToSingleStmt(stmt.loc, stmts.toOwnedSlice());
- }
-
- // One statement could potentially expand to several statements
- pub fn stmtsToSingleStmt(p: *P, loc: logger.Loc, stmts: []Stmt) Stmt {
- if (stmts.len == 0) {
- return p.s(S.Empty{}, loc);
- }
-
- if (stmts.len == 1) {
- switch (stmts[0].data) {
- .s_local => |local| {
- // "let" and "const" must be put in a block when in a single-statement context
-
- if (local.kind == .k_var) {
- return stmts[0];
- }
- },
- else => {
- return stmts[0];
- },
- }
- }
-
- return p.s(S.Block{ .stmts = stmts }, loc);
- }
-
- pub fn findLabelSymbol(p: *P, loc: logger.Loc, name: string) FindLabelSymbolResult {
- var res = FindLabelSymbolResult{ .ref = undefined, .is_loop = false };
-
- var _scope: ?*Scope = p.current_scope;
-
- while (_scope) |scope| : (_scope = scope.parent) {
- var label_ref = scope.label_ref orelse continue;
-
- if (!scope.kindStopsHoisting() or (scope.kind != .label) or !strings.eql(name, p.symbols.items[label_ref.inner_index].original_name)) {
- continue;
- }
-
- // Track how many times we've referenced this symbol
- p.recordUsage(&label_ref);
- res.ref = label_ref;
- res.is_loop = scope.label_stmt_is_loop;
- res.found = true;
- break;
- }
-
- const r = js_lexer.rangeOfIdentifier(&p.source, loc);
- p.log.addRangeErrorFmt(p.source, r, p.allocator, "There is no containing label named {s}", .{name}) catch unreachable;
-
- // Allocate an "unbound" symbol
- var ref = p.newSymbol(.unbound, name) catch unreachable;
-
- // Track how many times we've referenced this symbol
- p.recordUsage(&ref);
-
- return res;
- }
-
- pub fn visitClass(p: *P, name_scope_loc: logger.Loc, class: *G.Class) Ref {
- class.ts_decorators = p.visitTSDecorators(class.ts_decorators);
-
- if (class.class_name) |name| {
- p.recordDeclaredSymbol(name.ref.?) catch unreachable;
- }
-
- p.pushScopeForVisitPass(.class_name, name_scope_loc) catch unreachable;
- const old_enclosing_class_keyword = p.enclosing_class_keyword;
- p.enclosing_class_keyword = class.class_keyword;
- p.current_scope.recursiveSetStrictMode(.implicit_strict_mode_class);
- var class_name_ref: Ref = if (class.class_name != null) class.class_name.?.ref.? else p.newSymbol(.other, "this") catch unreachable;
-
- var shadow_ref = Ref.None;
-
- if (!class_name_ref.eql(Ref.None)) {
- // are not allowed to assign to this symbol (it throws a TypeError).
- const name = p.symbols.items[class_name_ref.inner_index].original_name;
- var identifier = p.allocator.alloc(u8, name.len + 1) catch unreachable;
- std.mem.copy(u8, identifier[1..identifier.len], name);
- identifier[0] = '_';
- shadow_ref = p.newSymbol(Symbol.Kind.cconst, identifier) catch unreachable;
- p.recordDeclaredSymbol(shadow_ref) catch unreachable;
- if (class.class_name) |class_name| {
- p.current_scope.members.put(identifier, Scope.Member{ .loc = class_name.loc, .ref = shadow_ref }) catch unreachable;
- }
- }
-
- if (class.extends) |extends| {
- class.extends = p.visitExpr(extends);
- }
-
- p.pushScopeForVisitPass(.class_body, class.body_loc) catch unreachable;
- defer p.popScope();
-
- var i: usize = 0;
- while (i < class.properties.len) : (i += 1) {
- var property = &class.properties[i];
- property.ts_decorators = p.visitTSDecorators(property.ts_decorators);
- const is_private = if (property.key != null) @as(Expr.Tag, property.key.?.data) == .e_private_identifier else false;
-
- // Special-case EPrivateIdentifier to allow it here
-
- if (is_private) {
- p.recordDeclaredSymbol(property.key.?.data.e_private_identifier.ref) catch unreachable;
- } else if (property.key) |key| {
- class.properties[i].key = p.visitExpr(key);
- }
-
- // Make it an error to use "arguments" in a class body
- p.current_scope.forbid_arguments = true;
- defer p.current_scope.forbid_arguments = false;
-
- // The value of "this" is shadowed inside property values
- const old_is_this_captured = p.fn_only_data_visit.is_this_nested;
- const old_this = p.fn_only_data_visit.this_class_static_ref;
- p.fn_only_data_visit.is_this_nested = true;
- p.fn_only_data_visit.this_class_static_ref = null;
- defer p.fn_only_data_visit.is_this_nested = old_is_this_captured;
- defer p.fn_only_data_visit.this_class_static_ref = old_this;
-
- // We need to explicitly assign the name to the property initializer if it
- // will be transformed such that it is no longer an inline initializer.
- var name_to_keep: ?string = null;
- if (is_private) {} else if (!property.flags.is_method and !property.flags.is_computed) {
- if (property.key) |key| {
- if (@as(Expr.Tag, key.data) == .e_string) {
- name_to_keep = p.lexer.utf16ToString(key.data.e_string.value);
- }
- }
- }
-
- if (property.value) |val| {
- if (name_to_keep) |name| {
- const was_anon = p.isAnonymousNamedExpr(val);
- property.value = p.maybeKeepExprSymbolName(p.visitExpr(val), name, was_anon);
- } else {
- property.value = p.visitExpr(val);
- }
- }
-
- if (property.initializer) |val| {
- // if (property.flags.is_static and )
- if (name_to_keep) |name| {
- const was_anon = p.isAnonymousNamedExpr(val);
- property.initializer = p.maybeKeepExprSymbolName(p.visitExpr(val), name, was_anon);
- } else {
- property.initializer = p.visitExpr(val);
- }
- }
- }
-
- if (!shadow_ref.eql(Ref.None)) {
- if (p.symbols.items[shadow_ref.inner_index].use_count_estimate == 0) {
- // Don't generate a shadowing name if one isn't needed
- shadow_ref = Ref.None;
- } else if (class.class_name) |class_name| {
- // If there was originally no class name but something inside needed one
- // (e.g. there was a static property initializer that referenced "this"),
- // store our generated name so the class expression ends up with a name.
- class.class_name = LocRef{ .loc = name_scope_loc, .ref = class_name_ref };
- p.current_scope.generated.append(class_name_ref) catch unreachable;
- p.recordDeclaredSymbol(class_name_ref) catch unreachable;
- }
- }
-
- return shadow_ref;
- }
-
- fn keepStmtSymbolName(p: *P, loc: logger.Loc, ref: Ref, name: string) Stmt {
- var exprs = p.allocator.alloc(Expr, 2) catch unreachable;
- exprs[0] = p.e(E.Identifier{
- .ref = ref,
- }, loc);
- exprs[1] = p.e(E.String{ .value = strings.toUTF16Alloc(name, p.allocator) catch unreachable }, loc);
- return p.s(S.SExpr{
- // I believe that this is a spot we can do $RefreshReg$(name)
- .value = p.callRuntime(loc, "__name", exprs),
-
- // Make sure tree shaking removes this if the function is never used
- .does_not_affect_tree_shaking = true,
- }, loc);
- }
-
- pub fn callRuntime(p: *P, loc: logger.Loc, name: string, args: []Expr) Expr {
- var ref: Ref = undefined;
- if (!p.runtime_imports.contains(name)) {
- ref = p.newSymbol(.other, name) catch unreachable;
- p.module_scope.generated.append(ref) catch unreachable;
- p.runtime_imports.put(name, ref) catch unreachable;
- } else {
- ref = p.runtime_imports.get(name) orelse unreachable;
- }
-
- p.recordUsage(&ref);
- return p.e(E.Call{
- .target = p.e(E.Identifier{
- .ref = ref,
- }, loc),
- .args = args,
- }, loc);
- }
-
- fn visitStmts(p: *P, stmts: *List(Stmt), kind: StmtsKind) !void {
- // Save the current control-flow liveness. This represents if we are
- // currently inside an "if (false) { ... }" block.
- var old_is_control_flow_dead = p.is_control_flow_dead;
-
- // visit all statements first
- var visited = try List(Stmt).initCapacity(p.allocator, stmts.items.len);
- var before = List(Stmt).init(p.allocator);
- var after = List(Stmt).init(p.allocator);
- for (stmts.items) |*stmt| {
- switch (stmt.data) {
- .s_export_equals => {
- // TypeScript "export = value;" becomes "module.exports = value;". This
- // must happen at the end after everything is parsed because TypeScript
- // moves this statement to the end when it generates code.
- try p.visitAndAppendStmt(&after, stmt);
- continue;
- },
- .s_function => |data| {
- // Manually hoist block-level function declarations to preserve semantics.
- // This is only done for function declarations that are not generators
- // or async functions, since this is a backwards-compatibility hack from
- // Annex B of the JavaScript standard.
- if (!p.current_scope.kindStopsHoisting() and p.symbols.items[data.func.name.?.ref.?.inner_index].kind == .hoisted_function) {
- try p.visitAndAppendStmt(&before, stmt);
- continue;
- }
- },
- else => {},
- }
- try p.visitAndAppendStmt(&visited, stmt);
- }
- }
-
- fn extractDeclsForBinding(binding: Binding, decls: *List(G.Decl)) !void {
- switch (binding.data) {
- .b_property, .b_missing => {},
- .b_identifier => {
- try decls.append(G.Decl{ .binding = binding });
- },
- .b_array => |arr| {
- for (arr.items) |item| {
- extractDeclsForBinding(item.binding, decls) catch unreachable;
- }
- },
- .b_object => |obj| {
- for (obj.properties) |prop| {
- extractDeclsForBinding(prop.value, decls) catch unreachable;
- }
- },
- }
- }
-
- // This assumes that the open parenthesis has already been parsed by the caller
- pub fn parseParenExpr(p: *P, loc: logger.Loc, opts: ParenExprOpts) !Expr {
- var items_list = try List(Expr).initCapacity(p.allocator, 1);
- var errors = DeferredErrors{};
- var arrowArgErrors = DeferredArrowArgErrors{};
- var spread_range = logger.Range{};
- var type_colon_range = logger.Range{};
- var comma_after_spread = logger.Loc{};
-
- // Push a scope assuming this is an arrow function. It may not be, in which
- // case we'll need to roll this change back. This has to be done ahead of
- // parsing the arguments instead of later on when we hit the "=>" token and
- // we know it's an arrow function because the arguments may have default
- // values that introduce new scopes and declare new symbols. If this is an
- // arrow function, then those new scopes will need to be parented under the
- // scope of the arrow function itself.
- const scopeIndex = try p.pushScopeForParsePass(.function_args, loc);
-
- // Allow "in" inside parentheses
- var oldAllowIn = p.allow_in;
- p.allow_in = true;
-
- // Forbid "await" and "yield", but only for arrow functions
- var old_fn_or_arrow_data = p.fn_or_arrow_data_parse;
- p.fn_or_arrow_data_parse.arrow_arg_errors = arrowArgErrors;
-
- // Scan over the comma-separated arguments or expressions
- while (p.lexer.token != .t_close_paren) {
- const item_loc = p.lexer.loc();
- const is_spread = p.lexer.token == .t_dot_dot_dot;
-
- if (is_spread) {
- spread_range = p.lexer.range();
- // p.markSyntaxFeature()
- p.lexer.next();
- }
-
- // We don't know yet whether these are arguments or expressions, so parse
- p.latest_arrow_arg_loc = p.lexer.loc();
-
- var item = p.parseExprOrBindings(.comma, &errors);
-
- if (is_spread) {
- item = p.e(E.Spread{ .value = item }, loc);
- }
-
- // Skip over types
- if (p.options.ts and p.lexer.token == .t_colon) {
- type_colon_range = p.lexer.range();
- p.lexer.next();
- p.skipTypescriptType(.lowest);
- }
-
- if (p.options.ts and p.lexer.token == .t_equals and !p.forbid_suffix_after_as_loc.eql(p.lexer.loc())) {
- p.lexer.next();
- item = Expr.assign(item, p.parseExpr(.comma), p.allocator);
- }
-
- items_list.append(item) catch unreachable;
-
- if (p.lexer.token != .t_comma) {
- break;
- }
-
- // Spread arguments must come last. If there's a spread argument followed
- if (is_spread) {
- comma_after_spread = p.lexer.loc();
- }
-
- // Eat the comma token
- p.lexer.next();
- }
- var items = items_list.toOwnedSlice();
-
- // The parenthetical construct must end with a close parenthesis
- p.lexer.expect(.t_close_paren);
-
- // Restore "in" operator status before we parse the arrow function body
- p.allow_in = oldAllowIn;
-
- // Also restore "await" and "yield" expression errors
- p.fn_or_arrow_data_parse = old_fn_or_arrow_data;
-
- // Are these arguments to an arrow function?
- if (p.lexer.token == .t_equals_greater_than or opts.force_arrow_fn or (p.options.ts and p.lexer.token == .t_colon)) {
- var invalidLog = List(logger.Loc).init(p.allocator);
- var args = List(G.Arg).init(p.allocator);
-
- if (opts.is_async) {
- // markl,oweredsyntaxpoksdpokasd
- }
-
- // First, try converting the expressions to bindings
- for (items) |*_item| {
- var item = _item;
- var is_spread = false;
- switch (item.data) {
- .e_spread => |v| {
- is_spread = true;
- item = &v.value;
- },
- else => {},
- }
-
- const tuple = p.convertExprToBindingAndInitializer(item, &invalidLog, is_spread);
- assert(tuple.binding != null);
- // double allocations
- args.append(G.Arg{
- .binding = tuple.binding orelse unreachable,
- .default = tuple.expr,
- }) catch unreachable;
- }
-
- // Avoid parsing TypeScript code like "a ? (1 + 2) : (3 + 4)" as an arrow
- // function. The ":" after the ")" may be a return type annotation, so we
- // attempt to convert the expressions to bindings first before deciding
- // whether this is an arrow function, and only pick an arrow function if
- // there were no conversion errors.
- if (p.lexer.token == .t_equals_greater_than or (invalidLog.items.len == 0 and (p.trySkipTypeScriptTypeParametersThenOpenParenWithBacktracking() or opts.force_arrow_fn))) {
- p.maybeCommaSpreadError(comma_after_spread);
- p.logArrowArgErrors(&arrowArgErrors);
- }
- }
-
- // If we get here, it's not an arrow function so undo the pushing of the
- // scope we did earlier. This needs to flatten any child scopes into the
- // parent scope as if the scope was never pushed in the first place.
- p.popAndFlattenScope(scopeIndex);
-
- // If this isn't an arrow function, then types aren't allowed
- if (type_colon_range.len > 0) {
- try p.log.addRangeError(p.source, type_colon_range, "Unexpected \":\"");
- p.panic("", .{});
- }
-
- // Are these arguments for a call to a function named "async"?
- if (opts.is_async) {
- p.logExprErrors(&errors);
- const async_expr = p.e(E.Identifier{ .ref = try p.storeNameInRef("async") }, loc);
- return p.e(E.Call{ .target = async_expr, .args = items }, loc);
- }
-
- // Is this a chain of expressions and comma operators?
-
- if (items.len > 0) {
- p.logExprErrors(&errors);
- if (spread_range.len > 0) {
- try p.log.addRangeError(p.source, type_colon_range, "Unexpected \"...\"");
- p.panic("", .{});
- }
-
- var value = Expr.joinAllWithComma(items, p.allocator);
- p.markExprAsParenthesized(&value);
- return value;
- }
-
- // Indicate that we expected an arrow function
- p.lexer.expected(.t_equals_greater_than);
- p.panic("", .{});
- }
-
- pub fn popAndFlattenScope(p: *P, scope_index: usize) void {
- // Move up to the parent scope
- var to_flatten = p.current_scope;
- var parent = to_flatten.parent.?;
- p.current_scope = parent;
- var scopes_in_order = p.scopes_in_order.toOwnedSlice();
- // Erase this scope from the order. This will shift over the indices of all
- // the scopes that were created after us. However, we shouldn't have to
- // worry about other code with outstanding scope indices for these scopes.
- // These scopes were all created in between this scope's push and pop
- // operations, so they should all be child scopes and should all be popped
- // by the time we get here.
- std.mem.copy(ScopeOrder, scopes_in_order[scope_index..scopes_in_order.len], scopes_in_order[scope_index + 1 .. scopes_in_order.len]);
- p.scopes_in_order = @TypeOf(p.scopes_in_order).fromOwnedSlice(p.allocator, scopes_in_order);
-
- // Remove the last child from the parent scope
- const last = parent.children.items.len - 1;
- assert(parent.children.items[last] == to_flatten);
- _ = parent.children.popOrNull();
-
- for (to_flatten.children.items) |item| {
- item.parent = parent;
- parent.children.append(item) catch unreachable;
- }
- }
-
- pub fn maybeCommaSpreadError(p: *P, _comma_after_spread: ?logger.Loc) void {
- if (_comma_after_spread) |comma_after_spread| {
- p.log.addRangeError(p.source, logger.Range{ .loc = comma_after_spread, .len = 1 }, "Unexpected \",\" after rest pattern") catch unreachable;
- }
- }
-
- pub fn toAST(p: *P, _parts: []js_ast.Part) !js_ast.Ast {
- var parts = _parts;
- // Insert an import statement for any runtime imports we generated
- if (p.runtime_imports.count() > 0 and !p.options.omit_runtime_for_tests) {}
-
- var parts_end: usize = 0;
- // Handle import paths after the whole file has been visited because we need
- // symbol usage counts to be able to remove unused type-only imports in
- // TypeScript code.
- while (true) {
- var kept_import_equals = false;
- var removed_import_equals = false;
-
- var i: usize = 0;
- // Potentially remove some statements, then filter out parts to remove any
- // with no statements
- while (i < parts.len) : (i += 1) {
- var part = parts[i];
- _ = p.import_records_for_current_part.toOwnedSlice();
- _ = p.declared_symbols.toOwnedSlice();
-
- var result = try ImportScanner.scan(p, part.stmts);
- kept_import_equals = kept_import_equals or result.kept_import_equals;
- removed_import_equals = removed_import_equals or result.removed_import_equals;
- part.import_record_indices = p.import_records_for_current_part.toOwnedSlice();
- part.declared_symbols = p.declared_symbols.toOwnedSlice();
- part.stmts = result.stmts;
- if (part.stmts.len > 0) {
- if (p.module_scope.contains_direct_eval and part.declared_symbols.len > 0) {
- // If this file contains a direct call to "eval()", all parts that
- // declare top-level symbols must be kept since the eval'd code may
- // reference those symbols.
- part.can_be_removed_if_unused = false;
- }
- parts[parts_end] = part;
- parts_end += 1;
- }
- }
-
- // We need to iterate multiple times if an import-equals statement was
- // removed and there are more import-equals statements that may be removed
- if (!kept_import_equals or !removed_import_equals) {
- break;
- }
- }
-
- parts = parts[0..parts_end];
- // Analyze cross-part dependencies for tree shaking and code splitting
-
- {
- // Map locals to parts
- p.top_level_symbol_to_parts = @TypeOf(p.top_level_symbol_to_parts).init(p.allocator);
- var i: usize = 0;
- while (i < parts.len) : (i += 1) {
- const part = parts[i];
- for (part.declared_symbols) |declared| {
- if (declared.is_top_level) {
- if (p.top_level_symbol_to_parts.contains(declared.ref)) {
- try p.top_level_symbol_to_parts.get(declared.ref).?.append(@intCast(u32, i));
- } else {
- var list = try List(u32).initCapacity(p.allocator, 1);
- list.appendAssumeCapacity(@intCast(u32, i));
- try p.top_level_symbol_to_parts.put(declared.ref, list);
- }
- }
- }
- }
-
- // Each part tracks the other parts it depends on within this file
- var local_dependencies = std.AutoHashMap(u32, u32).init(p.allocator);
-
- i = 0;
- while (i < parts.len) : (i += 1) {
- const part = parts[i];
- var iter = part.symbol_uses.iterator();
- var dependencies = List(js_ast.Dependency).init(p.allocator);
- while (iter.next()) |entry| {
- const ref = entry.key;
-
- if (p.top_level_symbol_to_parts.get(ref)) |tlstp| {
- for (tlstp.items) |other_part_index| {
- if (!local_dependencies.contains(other_part_index) or other_part_index != i) {
- try local_dependencies.put(other_part_index, @intCast(u32, i));
- try dependencies.append(js_ast.Dependency{
- .source_index = p.source.index,
- .part_index = other_part_index,
- });
- }
- }
- }
-
- // Also map from imports to parts that use them
- // TODO: will appending to this list like this be a perf issue?
- if (p.named_imports.getEntry(ref)) |named_import_entry| {
- const named_import = named_import_entry.value;
- var buf = try p.allocator.alloc(u32, named_import.local_parts_with_uses.len + 1);
- if (named_import.local_parts_with_uses.len > 0) {
- std.mem.copy(u32, buf, named_import.local_parts_with_uses);
- }
- buf[buf.len - 1] = @intCast(u32, i);
- named_import_entry.value.local_parts_with_uses = buf;
- }
- }
- }
- }
-
- var exports_kind = js_ast.ExportsKind.none;
- const uses_exports_ref = p.symbols.items[p.exports_ref.inner_index].use_count_estimate > 0;
- const uses_module_ref = p.symbols.items[p.module_ref.inner_index].use_count_estimate > 0;
-
- if (p.es6_export_keyword.len > 0 or p.top_level_await_keyword.len > 0) {
- exports_kind = .esm;
- } else if (uses_exports_ref or uses_module_ref or p.has_top_level_return) {
- exports_kind = .cjs;
- } else {
- exports_kind = .esm;
- }
-
- var wrapper_name = try p.allocator.alloc(u8, "require_".len + p.source.identifier_name.len);
- std.mem.copy(u8, wrapper_name[0.."require_".len], "require_");
- std.mem.copy(u8, wrapper_name["require_".len..wrapper_name.len], p.source.identifier_name);
-
- var wrapper = try p.newSymbol(.other, wrapper_name);
-
- return js_ast.Ast{
- .parts = parts,
- .module_scope = p.module_scope.*,
- .symbols = p.symbols.toOwnedSlice(),
- .exports_ref = p.exports_ref,
- .wrapper_ref = wrapper,
- .import_records = p.import_records.toOwnedSlice(),
- .export_star_import_records = p.export_star_import_records.toOwnedSlice(),
- .top_level_symbol_to_parts = p.top_level_symbol_to_parts,
- .approximate_line_count = p.lexer.approximate_newline_count + 1,
- .exports_kind = exports_kind,
- .named_imports = p.named_imports,
- .named_exports = p.named_exports,
- .import_keyword = p.es6_import_keyword,
- .export_keyword = p.es6_export_keyword,
- // .top_Level_await_keyword = p.top_level_await_keyword,
- };
- }
-
- pub fn init(allocator: *std.mem.Allocator, log: *logger.Log, source: logger.Source, define: *Define, lexer: js_lexer.Lexer, opts: Parser.Options) !*P {
- var parser = try allocator.create(P);
- parser.allocated_names = @TypeOf(parser.allocated_names).init(allocator);
- parser.define = define;
- parser.scopes_for_current_part = @TypeOf(parser.scopes_for_current_part).init(allocator);
- parser.symbols = @TypeOf(parser.symbols).init(allocator);
- parser.ts_use_counts = @TypeOf(parser.ts_use_counts).init(allocator);
- parser.declared_symbols = @TypeOf(parser.declared_symbols).init(allocator);
- parser.known_enum_values = @TypeOf(parser.known_enum_values).init(allocator);
- parser.import_records = @TypeOf(parser.import_records).init(allocator);
- parser.import_records_for_current_part = @TypeOf(parser.import_records_for_current_part).init(allocator);
- parser.export_star_import_records = @TypeOf(parser.export_star_import_records).init(allocator);
- parser.import_items_for_namespace = @TypeOf(parser.import_items_for_namespace).init(allocator);
- parser.named_imports = @TypeOf(parser.named_imports).init(allocator);
- parser.named_exports = @TypeOf(parser.named_exports).init(allocator);
- parser.top_level_symbol_to_parts = @TypeOf(parser.top_level_symbol_to_parts).init(allocator);
- parser.import_namespace_cc_map = @TypeOf(parser.import_namespace_cc_map).init(allocator);
- parser.scopes_in_order = @TypeOf(parser.scopes_in_order).init(allocator);
- parser.temp_refs_to_declare = @TypeOf(parser.temp_refs_to_declare).init(allocator);
- parser.relocated_top_level_vars = @TypeOf(parser.relocated_top_level_vars).init(allocator);
- parser.log = log;
- parser.is_import_item = @TypeOf(parser.is_import_item).init(allocator);
- parser.allocator = allocator;
- parser.runtime_imports = StringRefMap.init(allocator);
- parser.options = opts;
- parser.to_expr_wrapper_namespace = Binding2ExprWrapper.Namespace.init(parser);
- parser.to_expr_wrapper_hoisted = Binding2ExprWrapper.Hoisted.init(parser);
- parser.source = source;
- parser.import_transposer = @TypeOf(parser.import_transposer).init(parser);
- parser.require_transposer = @TypeOf(parser.require_transposer).init(parser);
- parser.require_resolve_transposer = @TypeOf(parser.require_resolve_transposer).init(parser);
- parser.lexer = lexer;
- parser.data = js_ast.AstData.init(allocator);
-
- _ = try parser.pushScopeForParsePass(.entry, locModuleScope);
-
- return parser;
- }
-};
-
-// The "await" and "yield" expressions are never allowed in argument lists but
-// may or may not be allowed otherwise depending on the details of the enclosing
-// function or module. This needs to be handled when parsing an arrow function
-// argument list because we don't know if these expressions are not allowed until
-// we reach the "=>" token (or discover the absence of one).
-//
-// Specifically, for await:
-//
-// // This is ok
-// async function foo() { (x = await y) }
-//
-// // This is an error
-// async function foo() { (x = await y) => {} }
-//
-// And for yield:
-//
-// // This is ok
-// function* foo() { (x = yield y) }
-//
-// // This is an error
-// function* foo() { (x = yield y) => {} }
-//
-const DeferredArrowArgErrors = struct {
- invalid_expr_await: logger.Range = logger.Range.None,
- invalid_expr_yield: logger.Range = logger.Range.None,
-};
-
-const SymbolList = [][]Symbol;
-
-fn expectPrintedJS(contents: string, expected: string) !void {
- if (alloc.dynamic_manager == null) {
- try alloc.setup(std.heap.page_allocator);
- }
-
- debugl("INIT TEST");
-
- const opts = try options.TransformOptions.initUncached(alloc.dynamic, "file.js", contents);
- var log = logger.Log.init(alloc.dynamic);
- var source = logger.Source.initFile(opts.entry_point, alloc.dynamic);
- var ast: js_ast.Ast = undefined;
-
- var define = try Define.init(alloc.dynamic, null);
- debugl("INIT PARSER");
- var parser = try Parser.init(opts, &log, &source, define, alloc.dynamic);
- debugl("RUN PARSER");
-
- var res = try parser.parse();
- ast = res.ast;
- var symbols: SymbolList = &([_][]Symbol{ast.symbols});
- var symbol_map = js_ast.Symbol.Map.initList(symbols);
-
- if (log.msgs.items.len > 0) {
- debugl("PRINT LOG ERRORS");
- var fixedBuffer = [_]u8{0} ** 4096;
- var stream = std.io.fixedBufferStream(&fixedBuffer);
-
- try log.print(stream.writer());
- std.debug.print("{s}", .{fixedBuffer});
- }
- var linker = @import("linker.zig").Linker{};
-
- debugl("START AST PRINT");
- const result = js_printer.printAst(alloc.dynamic, ast, symbol_map, true, js_printer.Options{ .to_module_ref = res.ast.module_ref orelse Ref{ .inner_index = 0 } }, &linker) catch unreachable;
-
- std.testing.expectEqualStrings(contents, result.js);
-}
-
-test "expectPrint" {
- try expectPrintedJS(
- "const bacon = true; function hello() { return 100; }; hello();",
- "const bacon = true; function hello() { return 100; }; hello();",
- );
-}
+usingnamespace @import("js_parser/js_parser.zig");
diff --git a/src/js_parser/imports.zig b/src/js_parser/imports.zig
new file mode 100644
index 000000000..d5197930d
--- /dev/null
+++ b/src/js_parser/imports.zig
@@ -0,0 +1,40 @@
+pub const std = @import("std");
+pub const logger = @import("../logger.zig");
+pub const js_lexer = @import("../js_lexer.zig");
+pub const importRecord = @import("../import_record.zig");
+pub const js_ast = @import("../js_ast.zig");
+pub const options = @import("../options.zig");
+pub const alloc = @import("../alloc.zig");
+pub const js_printer = @import("../js_printer.zig");
+pub const renamer = @import("../renamer.zig");
+pub const fs = @import("../fs.zig");
+
+pub usingnamespace @import("../strings.zig");
+pub usingnamespace @import("../ast/base.zig");
+pub usingnamespace js_ast.G;
+pub usingnamespace @import("../defines.zig");
+
+pub const ImportKind = importRecord.ImportKind;
+pub const BindingNodeIndex = js_ast.BindingNodeIndex;
+
+pub const StmtNodeIndex = js_ast.StmtNodeIndex;
+pub const ExprNodeIndex = js_ast.ExprNodeIndex;
+pub const ExprNodeList = js_ast.ExprNodeList;
+pub const StmtNodeList = js_ast.StmtNodeList;
+pub const BindingNodeList = js_ast.BindingNodeList;
+pub const assert = std.debug.assert;
+
+pub const LocRef = js_ast.LocRef;
+pub const S = js_ast.S;
+pub const B = js_ast.B;
+pub const G = js_ast.G;
+pub const T = js_lexer.T;
+pub const E = js_ast.E;
+pub const Stmt = js_ast.Stmt;
+pub const Expr = js_ast.Expr;
+pub const Binding = js_ast.Binding;
+pub const Symbol = js_ast.Symbol;
+pub const Level = js_ast.Op.Level;
+pub const Op = js_ast.Op;
+pub const Scope = js_ast.Scope;
+pub const locModuleScope = logger.Loc.Empty;
diff --git a/src/js_parser/js_parser.zig b/src/js_parser/js_parser.zig
new file mode 100644
index 000000000..07a9f037f
--- /dev/null
+++ b/src/js_parser/js_parser.zig
@@ -0,0 +1,10245 @@
+usingnamespace @import("imports.zig");
+
+pub fn ExpressionTransposer(comptime ctx: type, visitor: fn (ptr: *ctx, arg: Expr, state: anytype) Expr) type {
+ return struct {
+ context: *Context,
+
+ pub fn init(c: *Context) @This() {
+ return @This(){
+ .context = c,
+ };
+ }
+
+ pub fn maybeTransposeIf(self: *@This(), arg: Expr, state: anytype) Expr {
+ switch (arg.data) {
+ .e_if => |ex| {
+ ex.yes = self.maybeTransposeIf(ex.yes, state);
+ ex.no = self.maybeTransposeIf(ex.no, state);
+ return arg;
+ },
+ else => {
+ return visitor(self.context, arg, state);
+ },
+ }
+ }
+ pub const Context = ctx;
+ };
+}
+
+pub fn locAfterOp(e: E.Binary) logger.Loc {
+ if (e.left.loc.start < e.right.loc.start) {
+ return e.right.loc;
+ } else {
+ // handle the case when we have transposed the operands
+ return e.left.loc;
+ }
+}
+
+pub const ImportScanner = struct {
+ stmts: []Stmt = &([_]Stmt{}),
+ kept_import_equals: bool = false,
+ removed_import_equals: bool = false,
+ pub fn scan(p: *P, stmts: []Stmt) !ImportScanner {
+ var scanner = ImportScanner{};
+ var stmts_end: usize = 0;
+
+ for (stmts) |_stmt| {
+ // zls needs the hint, it seems.
+ const stmt: Stmt = _stmt;
+ switch (stmt.data) {
+ .s_import => |st| {
+ var record: ImportRecord = p.import_records.items[st.import_record_index];
+
+ // The official TypeScript compiler always removes unused imported
+ // symbols. However, we deliberately deviate from the official
+ // TypeScript compiler's behavior doing this in a specific scenario:
+ // we are not bundling, symbol renaming is off, and the tsconfig.json
+ // "importsNotUsedAsValues" setting is present and is not set to
+ // "remove".
+ //
+ // This exists to support the use case of compiling partial modules for
+ // compile-to-JavaScript languages such as Svelte. These languages try
+ // to reference imports in ways that are impossible for esbuild to know
+ // about when esbuild is only given a partial module to compile. Here
+ // is an example of some Svelte code that might use esbuild to convert
+ // TypeScript to JavaScript:
+ //
+ // <script lang="ts">
+ // import Counter from './Counter.svelte';
+ // export let name: string = 'world';
+ // </script>
+ // <main>
+ // <h1>Hello {name}!</h1>
+ // <Counter />
+ // </main>
+ //
+ // Tools that use esbuild to compile TypeScript code inside a Svelte
+ // file like this only give esbuild the contents of the <script> tag.
+ // These tools work around this missing import problem when using the
+ // official TypeScript compiler by hacking the TypeScript AST to
+ // remove the "unused import" flags. This isn't possible in esbuild
+ // because esbuild deliberately does not expose an AST manipulation
+ // API for performance reasons.
+ //
+ // We deviate from the TypeScript compiler's behavior in this specific
+ // case because doing so is useful for these compile-to-JavaScript
+ // languages and is benign in other cases. The rationale is as follows:
+ //
+ // * If "importsNotUsedAsValues" is absent or set to "remove", then
+ // we don't know if these imports are values or types. It's not
+ // safe to keep them because if they are types, the missing imports
+ // will cause run-time failures because there will be no matching
+ // exports. It's only safe keep imports if "importsNotUsedAsValues"
+ // is set to "preserve" or "error" because then we can assume that
+ // none of the imports are types (since the TypeScript compiler
+ // would generate an error in that case).
+ //
+ // * If we're bundling, then we know we aren't being used to compile
+ // a partial module. The parser is seeing the entire code for the
+ // module so it's safe to remove unused imports. And also we don't
+ // want the linker to generate errors about missing imports if the
+ // imported file is also in the bundle.
+ //
+ // * If identifier minification is enabled, then using esbuild as a
+ // partial-module transform library wouldn't work anyway because
+ // the names wouldn't match. And that means we're minifying so the
+ // user is expecting the output to be as small as possible. So we
+ // should omit unused imports.
+ //
+ // const keep_unused_imports = !p.options.trim_unused_imports;
+ var did_remove_star_loc = false;
+ const keep_unused_imports = true;
+
+ // TypeScript always trims unused imports. This is important for
+ // correctness since some imports might be fake (only in the type
+ // system and used for type-only imports).
+ if (!keep_unused_imports) {
+ var found_imports = false;
+ var is_unused_in_typescript = false;
+
+ if (st.default_name) |default_name| {
+ found_imports = true;
+ var symbol = p.symbols.items[default_name.ref.?.inner_index];
+
+ // TypeScript has a separate definition of unused
+ if (p.options.ts and p.ts_use_counts.items[default_name.ref.?.inner_index] != 0) {
+ is_unused_in_typescript = false;
+ }
+
+ // Remove the symbol if it's never used outside a dead code region
+ if (symbol.use_count_estimate == 0) {
+ st.default_name = null;
+ }
+ }
+
+ // Remove the star import if it's unused
+ if (st.star_name_loc) |star_name| {
+ found_imports = true;
+ const symbol = p.symbols.items[st.namespace_ref.inner_index];
+
+ // TypeScript has a separate definition of unused
+ if (p.options.ts and p.ts_use_counts.items[st.namespace_ref.inner_index] != 0) {
+ is_unused_in_typescript = false;
+ }
+
+ // Remove the symbol if it's never used outside a dead code region
+ if (symbol.use_count_estimate == 0) {
+ // Make sure we don't remove this if it was used for a property
+ // access while bundling
+ var has_any = false;
+
+ if (p.import_items_for_namespace.get(st.namespace_ref)) |entry| {
+ if (entry.count() > 0) {
+ has_any = true;
+ }
+ }
+
+ if (!has_any) {
+ st.star_name_loc = null;
+ did_remove_star_loc = true;
+ }
+ }
+ }
+
+ // Remove items if they are unused
+ if (st.items.len > 0) {
+ found_imports = false;
+ var items_end: usize = 0;
+ var i: usize = 0;
+ while (i < st.items.len) : (i += 1) {
+ const item = st.items[i];
+ const ref = item.name.ref.?;
+ const symbol: Symbol = p.symbols.items[ref.inner_index];
+
+ // TypeScript has a separate definition of unused
+ if (p.options.ts and p.ts_use_counts.items[ref.inner_index] != 0) {
+ is_unused_in_typescript = false;
+ }
+
+ // Remove the symbol if it's never used outside a dead code region
+ if (symbol.use_count_estimate != 0) {
+ st.items[items_end] = item;
+ items_end += 1;
+ }
+ }
+
+ if (items_end < st.items.len - 1) {
+ var list = List(js_ast.ClauseItem).fromOwnedSlice(p.allocator, st.items);
+ list.shrinkAndFree(items_end);
+ st.items = list.toOwnedSlice();
+ }
+ }
+
+ // -- Original Comment --
+ // Omit this statement if we're parsing TypeScript and all imports are
+ // unused. Note that this is distinct from the case where there were
+ // no imports at all (e.g. "import 'foo'"). In that case we want to keep
+ // the statement because the user is clearly trying to import the module
+ // for side effects.
+ //
+ // This culling is important for correctness when parsing TypeScript
+ // because a) the TypeScript compiler does ths and we want to match it
+ // and b) this may be a fake module that only exists in the type system
+ // and doesn't actually exist in reality.
+ //
+ // We do not want to do this culling in JavaScript though because the
+ // module may have side effects even if all imports are unused.
+ // -- Original Comment --
+
+ // jarred: I think, in this project, we want this behavior, even in JavaScript.
+ // I think this would be a big performance improvement.
+ // The less you import, the less code you transpile.
+ // Side-effect imports are nearly always done through identifier-less imports
+ // e.g. `import 'fancy-stylesheet-thing/style.css';`
+ // This is a breaking change though. We can make it an option with some guardrail
+ // so maybe if it errors, it shows a suggestion "retry without trimming unused imports"
+ if (found_imports and !p.options.preserve_unused_imports_ts) {
+ // Ignore import records with a pre-filled source index. These are
+ // for injected files and we definitely do not want to trim these.
+ if (!Ref.isSourceIndexNull(record.source_index)) {
+ record.is_unused = true;
+ continue;
+ }
+ }
+ }
+
+ if (p.options.trim_unused_imports) {
+ if (st.star_name_loc != null or did_remove_star_loc) {
+ // -- Original Comment --
+ // If we're bundling a star import and the namespace is only ever
+ // used for property accesses, then convert each unique property to
+ // a clause item in the import statement and remove the star import.
+ // That will cause the bundler to bundle them more efficiently when
+ // both this module and the imported module are in the same group.
+ //
+ // Before:
+ //
+ // import * as ns from 'foo'
+ // console.log(ns.a, ns.b)
+ //
+ // After:
+ //
+ // import {a, b} from 'foo'
+ // console.log(a, b)
+ //
+ // This is not done if the namespace itself is used, because in that
+ // case the code for the namespace will have to be generated. This is
+ // determined by the symbol count because the parser only counts the
+ // star import as used if it was used for something other than a
+ // property access:
+ //
+ // import * as ns from 'foo'
+ // console.log(ns, ns.a, ns.b)
+ //
+ // -- Original Comment --
+
+ // jarred: we don't use the same grouping mechanism as esbuild
+ // but, we do this anyway.
+ // The reasons why are:
+ // * It makes static analysis for other tools simpler.
+ // * I imagine browsers may someday do some optimizations
+ // when it's "easier" to know only certain modules are used
+ // For example, if you're importing a component from a design system
+ // it's really stupid to import all 1,000 components from that design system
+ // when you just want <Button />
+ const namespace_ref = st.namespace_ref;
+ const convert_star_to_clause = p.symbols.items[namespace_ref.inner_index].use_count_estimate == 0;
+
+ if (convert_star_to_clause and !keep_unused_imports) {
+ st.star_name_loc = null;
+ }
+
+ // "importItemsForNamespace" has property accesses off the namespace
+ if (p.import_items_for_namespace.get(namespace_ref)) |import_items| {
+ var count = import_items.count();
+ if (count > 0) {
+ // Sort keys for determinism
+ var sorted: []string = try p.allocator.alloc(string, count);
+ var iter = import_items.iterator();
+ var i: usize = 0;
+ while (iter.next()) |item| {
+ sorted[i] = item.key;
+ i += 1;
+ }
+ strings.sortAsc(sorted);
+
+ if (convert_star_to_clause) {
+ // Create an import clause for these items. Named imports will be
+ // automatically created later on since there is now a clause.
+ var items = try p.allocator.alloc(js_ast.ClauseItem, count);
+ try p.declared_symbols.ensureUnusedCapacity(count);
+ i = 0;
+ for (sorted) |alias| {
+ const name: LocRef = import_items.get(alias) orelse unreachable;
+ const original_name = p.symbols.items[name.ref.?.inner_index].original_name;
+ items[i] = js_ast.ClauseItem{
+ .alias = alias,
+ .alias_loc = name.loc,
+ .name = name,
+ .original_name = original_name,
+ };
+ p.declared_symbols.appendAssumeCapacity(js_ast.DeclaredSymbol{
+ .ref = name.ref.?,
+ .is_top_level = true,
+ });
+
+ i += 1;
+ }
+
+ if (st.items.len > 0) {
+ p.panic("The syntax \"import {{x}}, * as y from 'path'\" isn't valid", .{});
+ }
+
+ st.items = items;
+ } else {
+ // If we aren't converting this star import to a clause, still
+ // create named imports for these property accesses. This will
+ // cause missing imports to generate useful warnings.
+ //
+ // It will also improve bundling efficiency for internal imports
+ // by still converting property accesses off the namespace into
+ // bare identifiers even if the namespace is still needed.
+
+ for (sorted) |alias| {
+ const name: LocRef = import_items.get(alias) orelse unreachable;
+
+ try p.named_imports.put(name.ref.?, js_ast.NamedImport{
+ .alias = alias,
+ .alias_loc = name.loc,
+ .namespace_ref = st.namespace_ref,
+ .import_record_index = st.import_record_index,
+ });
+
+ // Make sure the printer prints this as a property access
+ var symbol: Symbol = p.symbols.items[name.ref.?.inner_index];
+ symbol.namespace_alias = G.NamespaceAlias{ .namespace_ref = st.namespace_ref, .alias = alias };
+ p.symbols.items[name.ref.?.inner_index] = symbol;
+ }
+ }
+ }
+ }
+ }
+ }
+
+ try p.import_records_for_current_part.append(st.import_record_index);
+
+ if (st.star_name_loc != null) {
+ record.contains_import_star = true;
+ }
+
+ if (st.default_name != null) {
+ record.contains_default_alias = true;
+ } else {
+ for (st.items) |item| {
+ if (strings.eql(item.alias, "default")) {
+ record.contains_default_alias = true;
+ break;
+ }
+ }
+ }
+ },
+ .s_function => |st| {
+ if (st.func.flags.is_export) {
+ if (st.func.name) |name| {
+ try p.recordExport(name.loc, p.symbols.items[name.ref.?.inner_index].original_name, name.ref.?);
+ } else {
+ try p.log.addRangeError(p.source, logger.Range{ .loc = st.func.open_parens_loc, .len = 2 }, "Exported functions must have a name");
+ }
+ }
+ },
+ .s_class => |st| {
+ if (st.is_export) {
+ if (st.class.class_name) |name| {
+ try p.recordExport(name.loc, p.symbols.items[name.ref.?.inner_index].original_name, name.ref.?);
+ } else {
+ try p.log.addRangeError(p.source, logger.Range{ .loc = st.class.body_loc, .len = 0 }, "Exported classes must have a name");
+ }
+ }
+ },
+ .s_local => |st| {
+ if (st.is_export) {
+ for (st.decls) |decl| {
+ p.recordExportedBinding(decl.binding);
+ }
+ }
+
+ // Remove unused import-equals statements, since those likely
+ // correspond to types instead of values
+ if (st.was_ts_import_equals and !st.is_export and st.decls.len > 0) {
+ var decl = st.decls[0];
+
+ // Skip to the underlying reference
+ var value = decl.value;
+ if (decl.value) |val| {
+ while (true) {
+ if (@as(Expr.Tag, val.data) == .e_dot) {
+ value = val.data.e_dot.target;
+ } else {
+ break;
+ }
+ }
+ }
+
+ // Is this an identifier reference and not a require() call?
+ if (value) |val| {
+ if (@as(Expr.Tag, val.data) == .e_identifier) {
+ // Is this import statement unused?
+ if (@as(Binding.Tag, decl.binding.data) == .b_identifier and p.symbols.items[decl.binding.data.b_identifier.ref.inner_index].use_count_estimate == 0) {
+ p.ignoreUsage(val.data.e_identifier.ref);
+
+ scanner.removed_import_equals = true;
+ continue;
+ } else {
+ scanner.kept_import_equals = true;
+ }
+ }
+ }
+ }
+ },
+ .s_export_default => |st| {
+ try p.recordExport(st.default_name.loc, "default", st.default_name.ref.?);
+ },
+ .s_export_clause => |st| {
+ for (st.items) |item| {
+ try p.recordExport(item.alias_loc, item.alias, item.name.ref.?);
+ }
+ },
+ .s_export_star => |st| {
+ try p.import_records_for_current_part.append(st.import_record_index);
+
+ if (st.alias) |alias| {
+ // "export * as ns from 'path'"
+ try p.named_imports.put(st.namespace_ref, js_ast.NamedImport{
+ .alias = null,
+ .alias_is_star = true,
+ .alias_loc = alias.loc,
+ .namespace_ref = Ref.None,
+ .import_record_index = st.import_record_index,
+ .is_exported = true,
+ });
+ try p.recordExport(alias.loc, alias.original_name, st.namespace_ref);
+ } else {
+ // "export * from 'path'"
+ try p.export_star_import_records.append(st.import_record_index);
+ }
+ },
+ .s_export_from => |st| {
+ try p.import_records_for_current_part.append(st.import_record_index);
+
+ for (st.items) |item| {
+ const ref = item.name.ref orelse p.panic("Expected export from item to have a name {s}", .{st});
+ // Note that the imported alias is not item.Alias, which is the
+ // exported alias. This is somewhat confusing because each
+ // SExportFrom statement is basically SImport + SExportClause in one.
+ try p.named_imports.put(ref, js_ast.NamedImport{
+ .alias_is_star = false,
+ .alias = item.original_name,
+ .alias_loc = item.name.loc,
+ .namespace_ref = st.namespace_ref,
+ .import_record_index = st.import_record_index,
+ .is_exported = true,
+ });
+ try p.recordExport(item.name.loc, item.alias, ref);
+ }
+ },
+ else => {},
+ }
+
+ stmts[stmts_end] = stmt;
+ stmts_end += 1;
+ }
+ scanner.stmts = stmts[0..stmts_end];
+ return scanner;
+ }
+};
+
+pub const SideEffects = enum {
+ could_have_side_effects,
+ no_side_effects,
+
+ pub const Result = struct {
+ side_effects: SideEffects,
+ ok: bool = false,
+ value: bool = false,
+ };
+
+ pub fn toNumber(data: Expr.Data) ?f64 {
+ switch (data) {
+ .e_null => |e| {
+ return 0;
+ },
+ .e_undefined => |e| {
+ return std.math.nan_f64;
+ },
+ .e_boolean => |e| {
+ return if (e.value) 1.0 else 0.0;
+ },
+ .e_number => |e| {
+ return e.value;
+ },
+ else => {},
+ }
+
+ return null;
+ }
+
+ pub fn isPrimitiveToReorder(data: Expr.Data) bool {
+ switch (data) {
+ .e_null, .e_undefined, .e_string, .e_boolean, .e_number, .e_big_int => {
+ return true;
+ },
+ else => {
+ return false;
+ },
+ }
+ }
+
+ pub const Equality = struct { equal: bool = false, ok: bool = false };
+
+ // Returns "equal, ok". If "ok" is false, then nothing is known about the two
+ // values. If "ok" is true, the equality or inequality of the two values is
+ // stored in "equal".
+ pub fn eql(left: Expr.Data, right: Expr.Data) Equality {
+ var equality = Equality{};
+ switch (left) {
+ .e_null => |l| {
+ equality.equal = @as(Expr.Tag, right) == Expr.Tag.e_null;
+ equality.ok = equality.equal;
+ },
+ .e_undefined => |l| {
+ equality.equal = @as(Expr.Tag, right) == Expr.Tag.e_undefined;
+ equality.ok = equality.equal;
+ },
+ .e_boolean => |l| {
+ equality.ok = @as(Expr.Tag, right) == Expr.Tag.e_boolean;
+ equality.equal = l.value == right.e_boolean.value;
+ },
+ .e_number => |l| {
+ equality.ok = @as(Expr.Tag, right) == Expr.Tag.e_number;
+ equality.equal = l.value == right.e_number.value;
+ },
+ .e_big_int => |l| {
+ equality.ok = @as(Expr.Tag, right) == Expr.Tag.e_big_int;
+ equality.equal = strings.eql(l.value, right.e_big_int.value);
+ },
+ .e_string => |l| {
+ equality.ok = @as(Expr.Tag, right) == Expr.Tag.e_string;
+ equality.equal = std.mem.eql(u16, l.value, right.e_string.value);
+ },
+ else => {},
+ }
+
+ return equality;
+ }
+
+ // Returns true if this expression is known to result in a primitive value (i.e.
+ // null, undefined, boolean, number, bigint, or string), even if the expression
+ // cannot be removed due to side effects.
+ pub fn isPrimitiveWithSideEffects(data: Expr.Data) bool {
+ switch (data) {
+ .e_null, .e_undefined, .e_boolean, .e_number, .e_big_int, .e_string => {
+ return true;
+ },
+ .e_unary => |e| {
+ switch (e.op) {
+ // number or bigint
+ .un_pos,
+ .un_neg,
+ .un_cpl,
+ .un_pre_dec,
+ .un_pre_inc,
+ .un_post_dec,
+ .un_post_inc,
+ // boolean
+ .un_not,
+ .un_delete,
+ // undefined
+ .un_void,
+ // string
+ .un_typeof,
+ => {
+ return true;
+ },
+ else => {},
+ }
+ },
+ .e_binary => |e| {
+ switch (e.op) {
+ // boolean
+ .bin_lt,
+ .bin_le,
+ .bin_gt,
+ .bin_ge,
+ .bin_in,
+ .bin_instanceof,
+ .bin_loose_eq,
+ .bin_loose_ne,
+ .bin_strict_eq,
+ .bin_strict_ne,
+ // string, number, or bigint
+ .bin_add,
+ .bin_add_assign,
+ // number or bigint
+ .bin_sub,
+ .bin_mul,
+ .bin_div,
+ .bin_rem,
+ .bin_pow,
+ .bin_sub_assign,
+ .bin_mul_assign,
+ .bin_div_assign,
+ .bin_rem_assign,
+ .bin_pow_assign,
+ .bin_shl,
+ .bin_shr,
+ .bin_u_shr,
+ .bin_shl_assign,
+ .bin_shr_assign,
+ .bin_u_shr_assign,
+ .bin_bitwise_or,
+ .bin_bitwise_and,
+ .bin_bitwise_xor,
+ .bin_bitwise_or_assign,
+ .bin_bitwise_and_assign,
+ .bin_bitwise_xor_assign,
+ => {
+ return true;
+ },
+
+ // These always return one of the arguments unmodified
+ .bin_logical_and, .bin_logical_or, .bin_nullish_coalescing, .bin_logical_and_assign, .bin_logical_or_assign, .bin_nullish_coalescing_assign => {
+ return isPrimitiveWithSideEffects(e.left.data) and isPrimitiveWithSideEffects(e.right.data);
+ },
+ .bin_comma => {
+ return isPrimitiveWithSideEffects(e.right.data);
+ },
+ }
+ },
+ .e_if => {
+ return isPrimitiveWithSideEffects(e.yes.data) and isPrimitiveWithSideEffects(e.no.data);
+ },
+ else => {},
+ }
+ return false;
+ }
+
+ // Returns true if the result of the "typeof" operator on this expression is
+ // statically determined and this expression has no side effects (i.e. can be
+ // removed without consequence).
+ pub fn toTypeof(data: Expr.Data) ?string {
+ switch (data) {
+ .e_null => {
+ return "object";
+ },
+ .e_undefined => {
+ return "undefined";
+ },
+ .e_boolean => {
+ return "boolean";
+ },
+ .e_number => {
+ return "number";
+ },
+ .e_big_int => {
+ return "bigint";
+ },
+ .e_string => {
+ return "string";
+ },
+ .e_function, .e_arrow => {
+ return "function";
+ },
+ else => {},
+ }
+
+ return null;
+ }
+
+ pub fn toNullOrUndefined(exp: Expr.Data) Result {
+ switch (exp) {
+ // Never null or undefined
+ .e_boolean, .e_number, .e_string, .e_reg_exp, .e_function, .e_arrow, .e_big_int => {
+ return Result{ .value = false, .side_effects = SideEffects.no_side_effects, .ok = true };
+ },
+
+ .e_object, .e_array, .e_class => {
+ return Result{ .value = false, .side_effects = .could_have_side_effects, .ok = true };
+ },
+
+ // always anull or undefined
+ .e_null, .e_undefined => {
+ return Result{ .value = true, .side_effects = .could_have_side_effects, .ok = true };
+ },
+
+ .e_unary => |e| {
+ switch (e.op) {
+ // Always number or bigint
+ .un_pos, .un_neg, .un_cpl, .un_pre_dec, .un_pre_inc, .un_post_dec, .un_post_inc => {
+ return Result{ .ok = true, .value = false, .side_effects = SideEffects.could_have_side_effects };
+ },
+ // Always undefined
+ .un_not, .un_typeof, .un_delete => {
+ return Result{ .value = true, .side_effects = .could_have_side_effects, .ok = true };
+ },
+
+ .un_void => {
+ return Result{ .value = true, .side_effects = .could_have_side_effects, .ok = true };
+ },
+
+ else => {},
+ }
+ },
+
+ .e_binary => |e| {
+ switch (e.op) {
+ // always string or number or bigint
+ .bin_add,
+ .bin_add_assign,
+ // always number or bigint
+ .bin_sub,
+ .bin_mul,
+ .bin_div,
+ .bin_rem,
+ .bin_pow,
+ .bin_sub_assign,
+ .bin_mul_assign,
+ .bin_div_assign,
+ .bin_rem_assign,
+ .bin_pow_assign,
+ .bin_shl,
+ .bin_shr,
+ .bin_u_shr,
+ .bin_shl_assign,
+ .bin_shr_assign,
+ .bin_u_shr_assign,
+ .bin_bitwise_or,
+ .bin_bitwise_and,
+ .bin_bitwise_xor,
+ .bin_bitwise_or_assign,
+ .bin_bitwise_and_assign,
+ .bin_bitwise_xor_assign,
+ // always boolean
+ .bin_lt,
+ .bin_le,
+ .bin_gt,
+ .bin_ge,
+ .bin_in,
+ .bin_instanceof,
+ .bin_loose_eq,
+ .bin_loose_ne,
+ .bin_strict_eq,
+ .bin_strict_ne,
+ => {
+ return Result{ .ok = true, .value = false, .side_effects = SideEffects.could_have_side_effects };
+ },
+
+ .bin_comma => {
+ const res = toNullOrUndefined(e.right.data);
+ if (res.ok) {
+ return Result{ .ok = true, .value = res.value, .side_effects = SideEffects.could_have_side_effects };
+ }
+ },
+ else => {},
+ }
+ },
+ else => {},
+ }
+
+ return Result{ .ok = false, .value = false, .side_effects = SideEffects.could_have_side_effects };
+ }
+
+ pub fn toBoolean(exp: Expr.Data) Result {
+ switch (exp) {
+ .e_null, .e_undefined => {
+ return Result{ .ok = true, .value = false, .side_effects = .no_side_effects };
+ },
+ .e_boolean => |e| {
+ return Result{ .ok = true, .value = e.value, .side_effects = .no_side_effects };
+ },
+ .e_number => |e| {
+ return Result{ .ok = true, .value = e.value != 0.0 and !std.math.isNan(e.value), .side_effects = .no_side_effects };
+ },
+ .e_big_int => |e| {
+ return Result{ .ok = true, .value = !strings.eql(e.value, "0"), .side_effects = .no_side_effects };
+ },
+ .e_string => |e| {
+ return Result{ .ok = true, .value = e.value.len > 0, .side_effects = .no_side_effects };
+ },
+ .e_function, .e_arrow, .e_reg_exp => {
+ return Result{ .ok = true, .value = true, .side_effects = .no_side_effects };
+ },
+ .e_object, .e_array, .e_class => {
+ return Result{ .ok = true, .value = true, .side_effects = .could_have_side_effects };
+ },
+ .e_unary => |e_| {
+ switch (e_.op) {
+ .un_void => {
+ return Result{ .ok = true, .value = false, .side_effects = .could_have_side_effects };
+ },
+ .un_typeof => {
+ // Never an empty string
+
+ return Result{ .ok = true, .value = true, .side_effects = .could_have_side_effects };
+ },
+ .un_not => {
+ var result = toBoolean(e_.value.data);
+ if (result.ok) {
+ result.value = !result.value;
+ return result;
+ }
+ },
+ else => {},
+ }
+ },
+ .e_binary => |e_| {
+ switch (e_.op) {
+ .bin_logical_or => {
+ // "anything || truthy" is truthy
+ const result = toBoolean(e_.right.data);
+ if (result.value and result.ok) {
+ return Result{ .ok = true, .value = true, .side_effects = .could_have_side_effects };
+ }
+ },
+ .bin_logical_and => {
+ // "anything && falsy" is falsy
+ const result = toBoolean(e_.right.data);
+ if (!result.value and result.ok) {
+ return Result{ .ok = true, .value = false, .side_effects = .could_have_side_effects };
+ }
+ },
+ .bin_comma => {
+ // "anything, truthy/falsy" is truthy/falsy
+ var result = toBoolean(e_.right.data);
+ if (result.ok) {
+ result.side_effects = .could_have_side_effects;
+ return result;
+ }
+ },
+ else => {},
+ }
+ },
+ else => {},
+ }
+
+ return Result{ .ok = false, .value = false, .side_effects = SideEffects.could_have_side_effects };
+ }
+};
+
+const ExprOrLetStmt = struct {
+ stmt_or_expr: js_ast.StmtOrExpr,
+ decls: []G.Decl = &([_]G.Decl{}),
+};
+
+const FunctionKind = enum { stmt, expr };
+
+const EightLetterMatcher = strings.ExactSizeMatcher(8);
+
+const AsyncPrefixExpression = enum {
+ none,
+ is_yield,
+ is_async,
+ is_await,
+
+ pub fn find(ident: string) AsyncPrefixExpression {
+ if (ident.len != 5) {
+ return .none;
+ }
+
+ switch (EightLetterMatcher.match(ident)) {
+ EightLetterMatcher.case("yield") => {
+ return .is_yield;
+ },
+ EightLetterMatcher.case("await") => {
+ return .is_await;
+ },
+ EightLetterMatcher.case("async") => {
+ return .is_async;
+ },
+
+ else => {
+ return .none;
+ },
+ }
+ }
+};
+
+const IdentifierOpts = struct {
+ assign_target: js_ast.AssignTarget = js_ast.AssignTarget.none,
+ is_delete_target: bool = false,
+ was_originally_identifier: bool = false,
+};
+
+fn statementCaresAboutScope(stmt: Stmt) bool {
+ switch (stmt.data) {
+ .s_block,
+ .s_empty,
+ .s_debugger,
+ .s_expr,
+ .s_if,
+ .s_for,
+ .s_for_in,
+ .s_for_of,
+ .s_do_while,
+ .s_while,
+ .s_with,
+ .s_try,
+ .s_switch,
+ .s_return,
+ .s_throw,
+ .s_break,
+ .s_continue,
+ .s_directive,
+ => {
+ return false;
+ },
+ .s_local => |s| {
+ return s.kind != .k_var;
+ },
+ else => {
+ return true;
+ },
+ }
+}
+
+const ExprIn = struct {
+ // This tells us if there are optional chain expressions (EDot, EIndex, or
+ // ECall) that are chained on to this expression. Because of the way the AST
+ // works, chaining expressions on to this expression means they are our
+ // parent expressions.
+ //
+ // Some examples:
+ //
+ // a?.b.c // EDot
+ // a?.b[c] // EIndex
+ // a?.b() // ECall
+ //
+ // Note that this is false if our parent is a node with a OptionalChain
+ // value of OptionalChainStart. That means it's the start of a new chain, so
+ // it's not considered part of this one.
+ //
+ // Some examples:
+ //
+ // a?.b?.c // EDot
+ // a?.b?.[c] // EIndex
+ // a?.b?.() // ECall
+ //
+ // Also note that this is false if our parent is a node with a OptionalChain
+ // value of OptionalChainNone. That means it's outside parentheses, which
+ // means it's no longer part of the chain.
+ //
+ // Some examples:
+ //
+ // (a?.b).c // EDot
+ // (a?.b)[c] // EIndex
+ // (a?.b)() // ECall
+ //
+ has_chain_parent: bool = false,
+
+ // If our parent is an ECall node with an OptionalChain value of
+ // OptionalChainStart, then we will need to store the value for the "this" of
+ // that call somewhere if the current expression is an optional chain that
+ // ends in a property access. That's because the value for "this" will be
+ // used twice: once for the inner optional chain and once for the outer
+ // optional chain.
+ //
+ // Example:
+ //
+ // // Original
+ // a?.b?.();
+ //
+ // // Lowered
+ // var _a;
+ // (_a = a == null ? void 0 : a.b) == null ? void 0 : _a.call(a);
+ //
+ // In the example above we need to store "a" as the value for "this" so we
+ // can substitute it back in when we call "_a" if "_a" is indeed present.
+ // See also "thisArgFunc" and "thisArgWrapFunc" in "exprOut".
+ store_this_arg_for_parent_optional_chain: bool = false,
+
+ // Certain substitutions of identifiers are disallowed for assignment targets.
+ // For example, we shouldn't transform "undefined = 1" into "void 0 = 1". This
+ // isn't something real-world code would do but it matters for conformance
+ // tests.
+ assign_target: js_ast.AssignTarget = js_ast.AssignTarget.none,
+};
+
+const ExprOut = struct {
+ // True if the child node is an optional chain node (EDot, EIndex, or ECall
+ // with an IsOptionalChain value of true)
+ child_contains_optional_chain: bool = false,
+};
+
+const Tup = std.meta.Tuple;
+
+// This function exists to tie all of these checks together in one place
+fn isEvalOrArguments(name: string) bool {
+ return strings.eql(name, "eval") or strings.eql(name, "arguments");
+}
+
+const PrependTempRefsOpts = struct {
+ fn_body_loc: ?logger.Loc = null,
+ kind: StmtsKind = StmtsKind.none,
+};
+
+pub const StmtsKind = enum {
+ none,
+ loop_body,
+ fn_body,
+};
+
+fn notimpl() noreturn {
+ std.debug.panic("Not implemented yet!!", .{});
+}
+
+fn lexerpanic() noreturn {
+ std.debug.panic("LexerPanic", .{});
+}
+
+fn fail() noreturn {
+ std.debug.panic("Something went wrong :cry;", .{});
+}
+
+const ExprBindingTuple = struct { expr: ?ExprNodeIndex = null, binding: ?Binding = null, override_expr: ?ExprNodeIndex = null };
+
+const TempRef = struct {
+ ref: Ref,
+ value: ?Expr = null,
+};
+
+const ImportNamespaceCallOrConstruct = struct {
+ ref: js_ast.Ref,
+ is_construct: bool = false,
+};
+
+const ThenCatchChain = struct {
+ next_target: js_ast.Expr.Data,
+ has_multiple_args: bool = false,
+ has_catch: bool = false,
+};
+
+const ParsedPath = struct { loc: logger.Loc, text: string };
+
+const StrictModeFeature = enum {
+ with_statement,
+ delete_bare_name,
+ for_in_var_init,
+ eval_or_arguments,
+ reserved_word,
+ legacy_octal_literal,
+ legacy_octal_escape,
+ if_else_function_stmt,
+};
+
+const SymbolMergeResult = enum {
+ forbidden,
+ replace_with_new,
+ overwrite_with_new,
+ keep_existing,
+ become_private_get_set_pair,
+ become_private_static_get_set_pair,
+};
+
+const Map = std.AutoHashMap;
+
+const List = std.ArrayList;
+const LocList = List(logger.Loc);
+const StmtList = List(Stmt);
+
+const SymbolUseMap = Map(js_ast.Ref, js_ast.Symbol.Use);
+const StringRefMap = std.StringHashMap(js_ast.Ref);
+const StringBoolMap = std.StringHashMap(bool);
+const RefBoolMap = Map(js_ast.Ref, bool);
+const RefRefMap = Map(js_ast.Ref, js_ast.Ref);
+const ImportRecord = importRecord.ImportRecord;
+const Flags = js_ast.Flags;
+const ScopeOrder = struct {
+ loc: logger.Loc,
+ scope: *js_ast.Scope,
+};
+const EnumValueType = enum {
+ unknown,
+ string,
+ numeric,
+};
+
+const ParenExprOpts = struct {
+ async_range: logger.Range = logger.Range.None,
+ is_async: bool = false,
+ force_arrow_fn: bool = false,
+};
+
+const AwaitOrYield = enum {
+ allow_ident,
+ allow_expr,
+ forbid_all,
+};
+
+// This is function-specific information used during parsing. It is saved and
+// restored on the call stack around code that parses nested functions and
+// arrow expressions.
+const FnOrArrowDataParse = struct {
+ async_range: ?logger.Range = null,
+ allow_await: AwaitOrYield = AwaitOrYield.allow_ident,
+ allow_yield: AwaitOrYield = AwaitOrYield.allow_ident,
+ allow_super_call: bool = false,
+ is_top_level: bool = false,
+ is_constructor: bool = false,
+ is_typescript_declare: bool = false,
+ arrow_arg_errors: ?DeferredArrowArgErrors = null,
+
+ // In TypeScript, forward declarations of functions have no bodies
+ allow_missing_body_for_type_script: bool = false,
+
+ // Allow TypeScript decorators in function arguments
+ allow_ts_decorators: bool = false,
+
+ pub fn i() FnOrArrowDataParse {
+ return FnOrArrowDataParse{ .allow_await = AwaitOrYield.forbid_all };
+ }
+};
+
+// This is function-specific information used during visiting. It is saved and
+// restored on the call stack around code that parses nested functions and
+// arrow expressions.
+const FnOrArrowDataVisit = struct {
+ super_index_ref: ?*js_ast.Ref = null,
+
+ is_arrow: bool = false,
+ is_async: bool = false,
+ is_inside_loop: bool = false,
+ is_inside_switch: bool = false,
+ is_outside_fn_or_arrow: bool = false,
+
+ // This is used to silence unresolvable imports due to "require" calls inside
+ // a try/catch statement. The assumption is that the try/catch statement is
+ // there to handle the case where the reference to "require" crashes.
+ try_body_count: i32 = 0,
+};
+
+// This is function-specific information used during visiting. It is saved and
+// restored on the call stack around code that parses nested functions (but not
+// nested arrow functions).
+const FnOnlyDataVisit = struct {
+ // This is a reference to the magic "arguments" variable that exists inside
+ // functions in JavaScript. It will be non-nil inside functions and nil
+ // otherwise.
+ arguments_ref: ?js_ast.Ref = null,
+
+ // Arrow functions don't capture the value of "this" and "arguments". Instead,
+ // the values are inherited from the surrounding context. If arrow functions
+ // are turned into regular functions due to lowering, we will need to generate
+ // local variables to capture these values so they are preserved correctly.
+ this_capture_ref: ?js_ast.Ref = null,
+ arguments_capture_ref: ?js_ast.Ref = null,
+
+ // Inside a static class property initializer, "this" expressions should be
+ // replaced with the class name.
+ this_class_static_ref: ?js_ast.Ref = null,
+
+ // If we're inside an async arrow function and async functions are not
+ // supported, then we will have to convert that arrow function to a generator
+ // function. That means references to "arguments" inside the arrow function
+ // will have to reference a captured variable instead of the real variable.
+ is_inside_async_arrow_fn: bool = false,
+
+ // If false, the value for "this" is the top-level module scope "this" value.
+ // That means it's "undefined" for ECMAScript modules and "exports" for
+ // CommonJS modules. We track this information so that we can substitute the
+ // correct value for these top-level "this" references at compile time instead
+ // of passing the "this" expression through to the output and leaving the
+ // interpretation up to the run-time behavior of the generated code.
+ //
+ // If true, the value for "this" is nested inside something (either a function
+ // or a class declaration). That means the top-level module scope "this" value
+ // has been shadowed and is now inaccessible.
+ is_this_nested: bool = false,
+};
+
+// Due to ES6 destructuring patterns, there are many cases where it's
+// impossible to distinguish between an array or object literal and a
+// destructuring assignment until we hit the "=" operator later on.
+// This object defers errors about being in one state or the other
+// until we discover which state we're in.
+const DeferredErrors = struct {
+ // These are errors for expressions
+ invalid_expr_default_value: ?logger.Range = null,
+ invalid_expr_after_question: ?logger.Range = null,
+ array_spread_feature: ?logger.Range = null,
+
+ pub fn isEmpty(self: *DeferredErrors) bool {
+ return self.invalid_expr_default_value == null and self.invalid_expr_after_question == null and self.array_spread_feature == null;
+ }
+
+ pub fn mergeInto(self: *DeferredErrors, to: *DeferredErrors) void {
+ if (self.invalid_expr_default_value) |inv| {
+ to.invalid_expr_default_value = inv;
+ }
+
+ if (self.invalid_expr_after_question) |inv| {
+ to.invalid_expr_after_question = inv;
+ }
+
+ if (self.array_spread_feature) |inv| {
+ to.array_spread_feature = inv;
+ }
+ }
+
+ var None = DeferredErrors{
+ .invalid_expr_default_value = null,
+ .invalid_expr_after_question = null,
+ .array_spread_feature = null,
+ };
+};
+
+const ImportClause = struct {
+ items: []js_ast.ClauseItem = &([_]js_ast.ClauseItem{}),
+ is_single_line: bool = false,
+};
+
+const ModuleType = enum { esm };
+
+const PropertyOpts = struct {
+ async_range: logger.Range = logger.Range.None,
+ is_async: bool = false,
+ is_generator: bool = false,
+
+ // Class-related options
+ is_static: bool = false,
+ is_class: bool = false,
+ class_has_extends: bool = false,
+ allow_ts_decorators: bool = false,
+ ts_decorators: []Expr = &[_]Expr{},
+};
+
+pub const Parser = struct {
+ options: Options,
+ lexer: js_lexer.Lexer,
+ log: *logger.Log,
+ source: logger.Source,
+ define: *Define,
+ allocator: *std.mem.Allocator,
+ p: ?*P,
+
+ pub const Options = struct {
+ jsx: options.JSX,
+ ts: bool = false,
+ ascii_only: bool = true,
+ keep_names: bool = true,
+ mangle_syntax: bool = false,
+ mange_identifiers: bool = false,
+ omit_runtime_for_tests: bool = false,
+ ignore_dce_annotations: bool = true,
+ preserve_unused_imports_ts: bool = false,
+ use_define_for_class_fields: bool = false,
+ suppress_warnings_about_weird_code: bool = true,
+ moduleType: ModuleType = ModuleType.esm,
+ trim_unused_imports: bool = true,
+ };
+
+ pub fn parse(self: *Parser) !js_ast.Result {
+ if (self.p == null) {
+ self.p = try P.init(self.allocator, self.log, self.source, self.define, self.lexer, self.options);
+ }
+
+ var result: js_ast.Result = undefined;
+
+ if (self.p) |p| {
+ // Parse the file in the first pass, but do not bind symbols
+ var opts = ParseStatementOptions{ .is_module_scope = true };
+ debugl("<p.parseStmtsUpTo>");
+ const stmts = try p.parseStmtsUpTo(js_lexer.T.t_end_of_file, &opts);
+ debugl("</p.parseStmtsUpTo>");
+ try p.prepareForVisitPass();
+
+ // ESM is always strict mode. I don't think we need this.
+ // // Strip off a leading "use strict" directive when not bundling
+ // var directive = "";
+
+ // Insert a variable for "import.meta" at the top of the file if it was used.
+ // We don't need to worry about "use strict" directives because this only
+ // happens when bundling, in which case we are flatting the module scopes of
+ // all modules together anyway so such directives are meaningless.
+ // if (!p.import_meta_ref.isSourceIndexNull()) {
+ // // heap so it lives beyond this function call
+ // var decls = try p.allocator.alloc(G.Decl, 1);
+ // decls[0] = Decl{ .binding = p.b(B.Identifier{
+ // .ref = p.import_meta_ref,
+ // }, logger.Loc.Empty), .value = p.e(E.Object{}, logger.Loc.Empty) };
+ // var importMetaStatement = p.s(S.Local{
+ // .kind = .k_const,
+ // .decls = decls,
+ // }, logger.Loc.Empty);
+ // }
+
+ debugl("<p.appendPart>");
+ var before = List(js_ast.Part).init(p.allocator);
+ var after = List(js_ast.Part).init(p.allocator);
+ var parts = List(js_ast.Part).init(p.allocator);
+ try p.appendPart(&parts, stmts);
+ // for (stmts) |stmt| {
+ // var _stmts = ([_]Stmt{stmt});
+
+ // switch (stmt.data) {
+ // // Split up top-level multi-declaration variable statements
+
+ // .s_local => |local| {
+ // for (local.decls) |decl| {
+ // var decls = try p.allocator.alloc(Decl, 1);
+ // var clone = S.Local{
+ // .kind = local.kind,
+ // .decls = decls,
+ // .is_export = local.is_export,
+ // .was_ts_import_equals = local.was_ts_import_equals,
+ // };
+ // _stmts[0] = p.s(clone, stmt.loc);
+
+ // try p.appendPart(&parts, &_stmts);
+ // }
+ // },
+ // // Move imports (and import-like exports) to the top of the file to
+ // // ensure that if they are converted to a require() call, the effects
+ // // will take place before any other statements are evaluated.
+ // .s_import, .s_export_from, .s_export_star => {
+ // try p.appendPart(&before, &_stmts);
+ // },
+
+ // .s_export_equals => {
+ // try p.appendPart(&after, &_stmts);
+ // },
+ // else => {
+ // try p.appendPart(&parts, &_stmts);
+ // },
+ // }
+ // }
+ // p.popScope();
+ var parts_slice: []js_ast.Part = undefined;
+
+ if (before.items.len > 0 or after.items.len > 0) {
+ const before_len = before.items.len;
+ const after_len = after.items.len;
+ const parts_len = parts.items.len;
+ var _parts = try p.allocator.alloc(
+ js_ast.Part,
+ before_len +
+ after_len +
+ parts_len,
+ );
+ if (before_len > 0) {
+ std.mem.copy(js_ast.Part, _parts, before.toOwnedSlice());
+ }
+ if (parts_len > 0) {
+ std.mem.copy(js_ast.Part, _parts[before_len .. before_len + parts_len], parts.toOwnedSlice());
+ }
+
+ if (after_len > 0) {
+ std.mem.copy(js_ast.Part, _parts[before_len + parts_len .. _parts.len], after.toOwnedSlice());
+ }
+ parts_slice = _parts;
+ } else {
+ after.deinit();
+ before.deinit();
+ parts_slice = parts.toOwnedSlice();
+ }
+ debugl("</p.appendPart>");
+
+ // Pop the module scope to apply the "ContainsDirectEval" rules
+ // p.popScope();
+ debugl("<result.Ast>");
+ result.ast = try p.toAST(parts_slice);
+ result.ok = true;
+ debugl("</result.Ast>");
+
+ // result = p.toAST(parts);
+ // result.source_map_comment = p.lexer.source_mapping_url;
+ }
+
+ return result;
+ }
+
+ pub fn init(transform: options.TransformOptions, log: *logger.Log, source: *logger.Source, define: *Define, allocator: *std.mem.Allocator) !Parser {
+ const lexer = try js_lexer.Lexer.init(log, source, allocator);
+ return Parser{
+ .options = Options{
+ .ts = transform.loader == .tsx or transform.loader == .ts,
+ .jsx = options.JSX{
+ .parse = transform.loader == .tsx or transform.loader == .jsx,
+ .factory = transform.jsx_factory,
+ .fragment = transform.jsx_fragment,
+ },
+ },
+ .allocator = allocator,
+ .lexer = lexer,
+ .define = define,
+ .source = source.*,
+ .log = log,
+ .p = null,
+ };
+ }
+};
+
+const FindLabelSymbolResult = struct { ref: Ref, is_loop: bool, found: bool = false };
+
+const FindSymbolResult = struct {
+ ref: Ref,
+ declare_loc: ?logger.Loc = null,
+ is_inside_with_scope: bool = false,
+};
+const ExportClauseResult = struct { clauses: []js_ast.ClauseItem = &([_]js_ast.ClauseItem{}), is_single_line: bool = false };
+
+const DeferredTsDecorators = struct {
+ values: []js_ast.Expr,
+
+ // If this turns out to be a "declare class" statement, we need to undo the
+ // scopes that were potentially pushed while parsing the decorator arguments.
+ scope_index: usize,
+};
+
+const LexicalDecl = enum(u8) { forbid, allow_all, allow_fn_inside_if, allow_fn_inside_label };
+
+const ParseClassOptions = struct {
+ ts_decorators: []Expr = &[_]Expr{},
+ allow_ts_decorators: bool = false,
+ is_type_script_declare: bool = false,
+};
+
+const ParseStatementOptions = struct {
+ ts_decorators: ?DeferredTsDecorators = null,
+ lexical_decl: LexicalDecl = .forbid,
+ is_module_scope: bool = false,
+ is_namespace_scope: bool = false,
+ is_export: bool = false,
+ is_name_optional: bool = false, // For "export default" pseudo-statements,
+ is_typescript_declare: bool = false,
+};
+
+// P is for Parser!
+// public only because of Binding.ToExpr
+pub const P = struct {
+ allocator: *std.mem.Allocator,
+ options: Parser.Options,
+ log: *logger.Log,
+ define: *Define,
+ source: logger.Source,
+ lexer: js_lexer.Lexer,
+ allow_in: bool = false,
+ allow_private_identifiers: bool = false,
+ has_top_level_return: bool = false,
+ latest_return_had_semicolon: bool = false,
+ has_import_meta: bool = false,
+ has_es_module_syntax: bool = false,
+ top_level_await_keyword: logger.Range,
+ fn_or_arrow_data_parse: FnOrArrowDataParse,
+ fn_or_arrow_data_visit: FnOrArrowDataVisit,
+ fn_only_data_visit: FnOnlyDataVisit,
+ allocated_names: List(string),
+ latest_arrow_arg_loc: logger.Loc = logger.Loc.Empty,
+ forbid_suffix_after_as_loc: logger.Loc = logger.Loc.Empty,
+ current_scope: *js_ast.Scope = undefined,
+ scopes_for_current_part: List(*js_ast.Scope),
+ symbols: List(js_ast.Symbol),
+ ts_use_counts: List(u32),
+ exports_ref: js_ast.Ref = js_ast.Ref.None,
+ require_ref: js_ast.Ref = js_ast.Ref.None,
+ module_ref: js_ast.Ref = js_ast.Ref.None,
+ import_meta_ref: js_ast.Ref = js_ast.Ref.None,
+ promise_ref: ?js_ast.Ref = null,
+
+ data: js_ast.AstData,
+
+ injected_define_symbols: []js_ast.Ref,
+ symbol_uses: SymbolUseMap,
+ declared_symbols: List(js_ast.DeclaredSymbol),
+ runtime_imports: StringRefMap,
+ duplicate_case_checker: void,
+ non_bmp_identifiers: StringBoolMap,
+ legacy_octal_literals: void,
+ // legacy_octal_literals: map[js_ast.E]logger.Range,
+
+ // For strict mode handling
+ hoistedRefForSloppyModeBlockFn: void,
+
+ // For lowering private methods
+ weak_map_ref: ?js_ast.Ref,
+ weak_set_ref: ?js_ast.Ref,
+ private_getters: RefRefMap,
+ private_setters: RefRefMap,
+
+ // These are for TypeScript
+ should_fold_numeric_constants: bool = false,
+ emitted_namespace_vars: RefBoolMap,
+ is_exported_inside_namespace: RefRefMap,
+ known_enum_values: Map(js_ast.Ref, std.StringHashMap(f64)),
+ local_type_names: StringBoolMap,
+
+ // This is the reference to the generated function argument for the namespace,
+ // which is different than the reference to the namespace itself:
+ //
+ // namespace ns {
+ // }
+ //
+ // The code above is transformed into something like this:
+ //
+ // var ns1;
+ // (function(ns2) {
+ // })(ns1 or (ns1 = {}));
+ //
+ // This variable is "ns2" not "ns1". It is only used during the second
+ // "visit" pass.
+ enclosing_namespace_arg_ref: ?js_ast.Ref = null,
+
+ // Imports (both ES6 and CommonJS) are tracked at the top level
+ import_records: List(ImportRecord),
+ import_records_for_current_part: List(u32),
+ export_star_import_records: List(u32),
+
+ // These are for handling ES6 imports and exports
+ es6_import_keyword: logger.Range = logger.Range.None,
+ es6_export_keyword: logger.Range = logger.Range.None,
+ enclosing_class_keyword: logger.Range = logger.Range.None,
+ import_items_for_namespace: Map(js_ast.Ref, std.StringHashMap(js_ast.LocRef)),
+ is_import_item: RefBoolMap,
+ named_imports: Map(js_ast.Ref, js_ast.NamedImport),
+ named_exports: std.StringHashMap(js_ast.NamedExport),
+ top_level_symbol_to_parts: Map(js_ast.Ref, List(u32)),
+ import_namespace_cc_map: Map(ImportNamespaceCallOrConstruct, bool),
+
+ // The parser does two passes and we need to pass the scope tree information
+ // from the first pass to the second pass. That's done by tracking the calls
+ // to pushScopeForParsePass() and popScope() during the first pass in
+ // scopesInOrder.
+ //
+ // Then, when the second pass calls pushScopeForVisitPass() and popScope(),
+ // we consume entries from scopesInOrder and make sure they are in the same
+ // order. This way the second pass can efficiently use the same scope tree
+ // as the first pass without having to attach the scope tree to the AST.
+ //
+ // We need to split this into two passes because the pass that declares the
+ // symbols must be separate from the pass that binds identifiers to declared
+ // symbols to handle declaring a hoisted "var" symbol in a nested scope and
+ // binding a name to it in a parent or sibling scope.
+ scopes_in_order: List(ScopeOrder),
+
+ // These properties are for the visit pass, which runs after the parse pass.
+ // The visit pass binds identifiers to declared symbols, does constant
+ // folding, substitutes compile-time variable definitions, and lowers certain
+ // syntactic constructs as appropriate.
+ stmt_expr_value: Expr.Data,
+ call_target: Expr.Data,
+ delete_target: Expr.Data,
+ loop_body: Stmt.Data,
+ module_scope: *js_ast.Scope = undefined,
+ is_control_flow_dead: bool = false,
+
+ // Inside a TypeScript namespace, an "export declare" statement can be used
+ // to cause a namespace to be emitted even though it has no other observable
+ // effect. This flag is used to implement this feature.
+ //
+ // Specifically, namespaces should be generated for all of the following
+ // namespaces below except for "f", which should not be generated:
+ //
+ // namespace a { export declare const a }
+ // namespace b { export declare let [[b]] }
+ // namespace c { export declare function c() }
+ // namespace d { export declare class d {} }
+ // namespace e { export declare enum e {} }
+ // namespace f { export declare namespace f {} }
+ //
+ // The TypeScript compiler compiles this into the following code (notice "f"
+ // is missing):
+ //
+ // var a; (function (a_1) {})(a or (a = {}));
+ // var b; (function (b_1) {})(b or (b = {}));
+ // var c; (function (c_1) {})(c or (c = {}));
+ // var d; (function (d_1) {})(d or (d = {}));
+ // var e; (function (e_1) {})(e or (e = {}));
+ //
+ // Note that this should not be implemented by declaring symbols for "export
+ // declare" statements because the TypeScript compiler doesn't generate any
+ // code for these statements, so these statements are actually references to
+ // global variables. There is one exception, which is that local variables
+ // *should* be declared as symbols because they are replaced with. This seems
+ // like very arbitrary behavior but it's what the TypeScript compiler does,
+ // so we try to match it.
+ //
+ // Specifically, in the following code below "a" and "b" should be declared
+ // and should be substituted with "ns.a" and "ns.b" but the other symbols
+ // shouldn't. References to the other symbols actually refer to global
+ // variables instead of to symbols that are exported from the namespace.
+ // This is the case as of TypeScript 4.3. I assume this is a TypeScript bug:
+ //
+ // namespace ns {
+ // export declare const a
+ // export declare let [[b]]
+ // export declare function c()
+ // export declare class d { }
+ // export declare enum e { }
+ // console.log(a, b, c, d, e)
+ // }
+ //
+ // The TypeScript compiler compiles this into the following code:
+ //
+ // var ns;
+ // (function (ns) {
+ // console.log(ns.a, ns.b, c, d, e);
+ // })(ns or (ns = {}));
+ //
+ // Relevant issue: https://github.com/evanw/esbuild/issues/1158
+ has_non_local_export_declare_inside_namespace: bool = false,
+
+ // This helps recognize the "await import()" pattern. When this is present,
+ // warnings about non-string import paths will be omitted inside try blocks.
+ await_target: ?js_ast.Expr.Data = null,
+
+ to_expr_wrapper_namespace: Binding2ExprWrapper.Namespace,
+ to_expr_wrapper_hoisted: Binding2ExprWrapper.Hoisted,
+
+ // This helps recognize the "import().catch()" pattern. We also try to avoid
+ // warning about this just like the "try { await import() }" pattern.
+ then_catch_chain: ThenCatchChain,
+
+ // Temporary variables used for lowering
+ temp_refs_to_declare: List(TempRef),
+ temp_ref_count: i32 = 0,
+
+ // When bundling, hoisted top-level local variables declared with "var" in
+ // nested scopes are moved up to be declared in the top-level scope instead.
+ // The old "var" statements are turned into regular assignments instead. This
+ // makes it easier to quickly scan the top-level statements for "var" locals
+ // with the guarantee that all will be found.
+ relocated_top_level_vars: List(js_ast.LocRef),
+
+ // ArrowFunction is a special case in the grammar. Although it appears to be
+ // a PrimaryExpression, it's actually an AssignmentExpression. This means if
+ // a AssignmentExpression ends up producing an ArrowFunction then nothing can
+ // come after it other than the comma operator, since the comma operator is
+ // the only thing above AssignmentExpression under the Expression rule:
+ //
+ // AssignmentExpression:
+ // ArrowFunction
+ // ConditionalExpression
+ // LeftHandSideExpression = AssignmentExpression
+ // LeftHandSideExpression AssignmentOperator AssignmentExpression
+ //
+ // Expression:
+ // AssignmentExpression
+ // Expression , AssignmentExpression
+ //
+ after_arrow_body_loc: logger.Loc = logger.Loc.Empty,
+ import_transposer: ImportTransposer,
+ require_transposer: RequireTransposer,
+ require_resolve_transposer: RequireResolveTransposer,
+
+ const TransposeState = struct {
+ is_await_target: bool = false,
+ is_then_catch_target: bool = false,
+ loc: logger.Loc,
+ };
+
+ pub fn transposeImport(p: *P, arg: Expr, state: anytype) Expr {
+ // The argument must be a string
+ if (@as(Expr.Tag, arg.data) == .e_string) {
+ // Ignore calls to import() if the control flow is provably dead here.
+ // We don't want to spend time scanning the required files if they will
+ // never be used.
+ if (p.is_control_flow_dead) {
+ return p.e(E.Null{}, arg.loc);
+ }
+ const str = arg.data.e_string;
+
+ const import_record_index = p.addImportRecord(.dynamic, arg.loc, p.lexer.utf16ToString(str.value));
+ p.import_records.items[import_record_index].handles_import_errors = (state.is_await_target and p.fn_or_arrow_data_visit.try_body_count != 0) or state.is_then_catch_target;
+ p.import_records_for_current_part.append(import_record_index) catch unreachable;
+ return p.e(E.Import{
+ .expr = arg,
+ .import_record_index = @intCast(Ref.Int, import_record_index),
+ // .leading_interior_comments = arg.data.e_string.
+ }, state.loc);
+ }
+
+ // Use a debug log so people can see this if they want to
+ const r = js_lexer.rangeOfIdentifier(&p.source, state.loc);
+ p.log.addRangeDebug(p.source, r, "This \"import\" expression will not be bundled because the argument is not a string literal") catch unreachable;
+
+ return p.e(E.Import{
+ .expr = arg,
+ .import_record_index = Ref.None.source_index,
+ }, state.loc);
+ }
+
+ pub fn transposeRequireResolve(p: *P, arg: Expr, transpose_state: anytype) Expr {
+ return arg;
+ }
+
+ pub fn transposeRequire(p: *P, arg: Expr, transpose_state: anytype) Expr {
+ return arg;
+ }
+
+ const ImportTransposer = ExpressionTransposer(P, P.transposeImport);
+ const RequireTransposer = ExpressionTransposer(P, P.transposeRequire);
+ const RequireResolveTransposer = ExpressionTransposer(P, P.transposeRequireResolve);
+
+ const Binding2ExprWrapper = struct {
+ pub const Namespace = Binding.ToExpr(P, P.wrapIdentifierNamespace);
+ pub const Hoisted = Binding.ToExpr(P, P.wrapIdentifierHoisting);
+ };
+
+ pub fn s(p: *P, t: anytype, loc: logger.Loc) Stmt {
+ if (@typeInfo(@TypeOf(t)) == .Pointer) {
+ return Stmt.init(t, loc);
+ } else {
+ return Stmt.alloc(p.allocator, t, loc);
+ }
+ }
+ pub fn e(p: *P, t: anytype, loc: logger.Loc) Expr {
+ if (@typeInfo(@TypeOf(t)) == .Pointer) {
+ return Expr.init(t, loc);
+ } else {
+ return Expr.alloc(p.allocator, t, loc);
+ }
+ }
+
+ pub fn b(p: *P, t: anytype, loc: logger.Loc) Binding {
+ if (@typeInfo(@TypeOf(t)) == .Pointer) {
+ return Binding.init(t, loc);
+ } else {
+ return Binding.alloc(p.allocator, t, loc);
+ }
+ }
+
+ pub fn deinit(parser: *P) void {
+ parser.allocated_names.deinit();
+ parser.scopes_for_current_part.deinit();
+ parser.symbols.deinit();
+ parser.ts_use_counts.deinit();
+ parser.declared_symbols.deinit();
+ parser.known_enum_values.deinit();
+ parser.import_records.deinit();
+ parser.import_records_for_current_part.deinit();
+ parser.export_star_import_records.deinit();
+ parser.import_items_for_namespace.deinit();
+ parser.named_imports.deinit();
+ parser.top_level_symbol_to_parts.deinit();
+ parser.import_namespace_cc_map.deinit();
+ parser.scopes_in_order.deinit();
+ parser.temp_refs_to_declare.deinit();
+ parser.relocated_top_level_vars.deinit();
+ }
+
+ pub fn findSymbol(p: *P, loc: logger.Loc, name: string) !FindSymbolResult {
+ var ref: Ref = undefined;
+ var declare_loc: logger.Loc = undefined;
+ var is_inside_with_scope = false;
+ var did_forbid_argumen = false;
+ var scope = p.current_scope;
+
+ while (true) {
+
+ // Track if we're inside a "with" statement body
+ if (scope.kind == .with) {
+ is_inside_with_scope = true;
+ }
+
+ // Forbid referencing "arguments" inside class bodies
+ if (scope.forbid_arguments and strings.eql(name, "arguments") and !did_forbid_argumen) {
+ const r = js_lexer.rangeOfIdentifier(&p.source, loc);
+ p.log.addRangeErrorFmt(p.source, r, p.allocator, "Cannot access \"{s}\" here", .{name}) catch unreachable;
+ did_forbid_argumen = true;
+ }
+
+ // Is the symbol a member of this scope?
+ if (scope.members.get(name)) |member| {
+ ref = member.ref;
+ declare_loc = member.loc;
+ break;
+ }
+
+ if (scope.parent) |parent| {
+ scope = parent;
+ } else {
+ // Allocate an "unbound" symbol
+ p.checkForNonBMPCodePoint(loc, name);
+ ref = try p.newSymbol(.unbound, name);
+ declare_loc = loc;
+ try p.module_scope.members.put(name, js_ast.Scope.Member{ .ref = ref, .loc = logger.Loc.Empty });
+ break;
+ }
+ }
+
+ // If we had to pass through a "with" statement body to get to the symbol
+ // declaration, then this reference could potentially also refer to a
+ // property on the target object of the "with" statement. We must not rename
+ // it or we risk changing the behavior of the code.
+ if (is_inside_with_scope) {
+ p.symbols.items[ref.inner_index].must_not_be_renamed = true;
+ }
+
+ // Track how many times we've referenced this symbol
+ p.recordUsage(&ref);
+ return FindSymbolResult{
+ .ref = ref,
+ .declare_loc = declare_loc,
+ .is_inside_with_scope = is_inside_with_scope,
+ };
+ }
+
+ pub fn recordExportedBinding(p: *P, binding: Binding) void {
+ switch (binding.data) {
+ .b_missing => {},
+ .b_identifier => |ident| {
+ p.recordExport(binding.loc, p.symbols.items[ident.ref.inner_index].original_name, ident.ref) catch unreachable;
+ },
+ .b_array => |array| {
+ for (array.items) |prop| {
+ p.recordExportedBinding(prop.binding);
+ }
+ },
+ .b_object => |obj| {
+ for (obj.properties) |prop| {
+ p.recordExportedBinding(prop.value);
+ }
+ },
+ else => {
+ p.panic("Unexpected binding export type {s}", .{binding});
+ },
+ }
+ }
+
+ pub fn recordExport(p: *P, loc: logger.Loc, alias: string, ref: Ref) !void {
+ if (p.named_exports.get(alias)) |name| {
+ // Duplicate exports are an error
+ var notes = try p.allocator.alloc(logger.Data, 1);
+ notes[0] = logger.Data{
+ .text = try std.fmt.allocPrint(p.allocator, "\"{s}\" was originally exported here", .{alias}),
+ .location = logger.Location.init_or_nil(p.source, js_lexer.rangeOfIdentifier(&p.source, name.alias_loc)),
+ };
+ try p.log.addRangeErrorFmtWithNotes(
+ p.source,
+ js_lexer.rangeOfIdentifier(&p.source, loc),
+ p.allocator,
+ notes,
+ "Multiple exports with the same name {s}",
+ .{alias},
+ );
+ } else {
+ try p.named_exports.put(alias, js_ast.NamedExport{ .alias_loc = loc, .ref = ref });
+ }
+ }
+
+ pub fn recordUsage(p: *P, ref: *const js_ast.Ref) void {
+ // The use count stored in the symbol is used for generating symbol names
+ // during minification. These counts shouldn't include references inside dead
+ // code regions since those will be culled.
+ if (!p.is_control_flow_dead) {
+ p.symbols.items[ref.inner_index].use_count_estimate += 1;
+ var use = p.symbol_uses.get(ref.*) orelse unreachable;
+ use.count_estimate += 1;
+ p.symbol_uses.put(ref.*, use) catch unreachable;
+ }
+
+ // The correctness of TypeScript-to-JavaScript conversion relies on accurate
+ // symbol use counts for the whole file, including dead code regions. This is
+ // tracked separately in a parser-only data structure.
+ if (p.options.ts) {
+ p.ts_use_counts.items[ref.inner_index] += 1;
+ }
+ }
+
+ pub fn findSymbolHelper(self: *P, loc: logger.Loc, name: string) ?js_ast.Ref {
+ if (self.findSymbol(loc, name)) |sym| {
+ return sym.ref;
+ }
+
+ return null;
+ }
+
+ pub fn symbolForDefineHelper(self: *P, i: usize) ?js_ast.Ref {
+ if (self.injected_define_symbols.items.len > i) {
+ return self.injected_define_symbols.items[i];
+ }
+
+ return null;
+ }
+
+ pub fn logArrowArgErrors(p: *P, errors: *DeferredArrowArgErrors) void {
+ if (errors.invalid_expr_await.len > 0) {
+ var r = errors.invalid_expr_await;
+ p.log.addRangeError(p.source, r, "Cannot use an \"await\" expression here") catch unreachable;
+ }
+
+ if (errors.invalid_expr_yield.len > 0) {
+ var r = errors.invalid_expr_yield;
+ p.log.addRangeError(p.source, r, "Cannot use a \"yield\" expression here") catch unreachable;
+ }
+ }
+
+ pub fn keyNameForError(p: *P, key: js_ast.Expr) string {
+ switch (key.data) {
+ .e_string => {
+ return p.lexer.raw();
+ },
+ .e_private_identifier => {
+ return p.lexer.raw();
+ // return p.loadNameFromRef()
+ },
+ else => {
+ return "property";
+ },
+ }
+ }
+
+ pub fn canMergeSymbols(p: *P, scope: *js_ast.Scope, existing: Symbol.Kind, new: Symbol.Kind) SymbolMergeResult {
+ if (existing == .unbound) {
+ return .replace_with_new;
+ }
+
+ // In TypeScript, imports are allowed to silently collide with symbols within
+ // the module. Presumably this is because the imports may be type-only:
+ //
+ // import {Foo} from 'bar'
+ // class Foo {}
+ //
+ if (p.options.ts and existing == .import) {
+ return .replace_with_new;
+ }
+
+ // "enum Foo {} enum Foo {}"
+ // "namespace Foo { ... } enum Foo {}"
+ if (new == .ts_enum and (existing == .ts_enum or existing == .ts_namespace)) {
+ return .replace_with_new;
+ }
+
+ // "namespace Foo { ... } namespace Foo { ... }"
+ // "function Foo() {} namespace Foo { ... }"
+ // "enum Foo {} namespace Foo { ... }"
+ if (new == .ts_namespace) {
+ switch (existing) {
+ .ts_namespace, .hoisted_function, .generator_or_async_function, .ts_enum, .class => {
+ return .keep_existing;
+ },
+ else => {},
+ }
+ }
+
+ // "var foo; var foo;"
+ // "var foo; function foo() {}"
+ // "function foo() {} var foo;"
+ // "function *foo() {} function *foo() {}" but not "{ function *foo() {} function *foo() {} }"
+ if (Symbol.isKindHoistedOrFunction(new) and Symbol.isKindHoistedOrFunction(existing) and (scope.kind == .entry or scope.kind == .function_body or
+ (Symbol.isKindHoisted(new) and Symbol.isKindHoisted(existing))))
+ {
+ return .keep_existing;
+ }
+
+ // "get #foo() {} set #foo() {}"
+ // "set #foo() {} get #foo() {}"
+ if ((existing == .private_get and new == .private_set) or
+ (existing == .private_set and new == .private_get))
+ {
+ return .become_private_get_set_pair;
+ }
+ if ((existing == .private_static_get and new == .private_static_set) or
+ (existing == .private_static_set and new == .private_static_get))
+ {
+ return .become_private_static_get_set_pair;
+ }
+
+ // "try {} catch (e) { var e }"
+ if (existing == .catch_identifier and new == .hoisted) {
+ return .replace_with_new;
+ }
+
+ // "function() { var arguments }"
+ if (existing == .arguments and new == .hoisted) {
+ return .keep_existing;
+ }
+
+ // "function() { let arguments }"
+ if (existing == .arguments and new != .hoisted) {
+ return .overwrite_with_new;
+ }
+
+ return .forbidden;
+ }
+
+ pub fn handleIdentifier(p: *P, loc: logger.Loc, ident: *E.Identifier, _original_name: ?string, opts: IdentifierOpts) Expr {
+ const ref = ident.ref;
+
+ if ((opts.assign_target != .none or opts.is_delete_target) and p.symbols.items[ref.inner_index].kind == .import) {
+ // Create an error for assigning to an import namespace
+ const r = js_lexer.rangeOfIdentifier(&p.source, loc);
+ p.log.addRangeErrorFmt(p.source, r, p.allocator, "Cannot assign to import \"{s}\"", .{
+ p.symbols.items[ref.inner_index].original_name,
+ }) catch unreachable;
+ }
+
+ // Substitute an EImportIdentifier now if this is an import item
+ if (p.is_import_item.contains(ref)) {
+ return p.e(
+ E.ImportIdentifier{ .ref = ref, .was_originally_identifier = opts.was_originally_identifier },
+ loc,
+ );
+ }
+
+ // Substitute a namespace export reference now if appropriate
+ if (p.options.ts) {
+ if (p.is_exported_inside_namespace.get(ref)) |ns_ref| {
+ const name = p.symbols.items[ref.inner_index].original_name;
+
+ // If this is a known enum value, inline the value of the enum
+ if (p.known_enum_values.get(ns_ref)) |enum_values| {
+ if (enum_values.get(name)) |number| {
+ return p.e(E.Number{ .value = number }, loc);
+ }
+ }
+
+ // Otherwise, create a property access on the namespace
+ p.recordUsage(&ns_ref);
+
+ return p.e(E.Dot{ .target = p.e(E.Identifier{ .ref = ns_ref }, loc), .name = name, .name_loc = loc }, loc);
+ }
+ }
+
+ if (_original_name) |original_name| {
+ const result = p.findSymbol(loc, original_name) catch unreachable;
+ ident.ref = result.ref;
+ }
+
+ return p.e(ident, loc);
+ }
+
+ pub fn prepareForVisitPass(p: *P) !void {
+ try p.pushScopeForVisitPass(js_ast.Scope.Kind.entry, locModuleScope);
+ p.fn_or_arrow_data_visit.is_outside_fn_or_arrow = true;
+ p.module_scope = p.current_scope;
+ p.has_es_module_syntax = p.es6_import_keyword.len > 0 or p.es6_export_keyword.len > 0 or p.top_level_await_keyword.len > 0;
+
+ // ECMAScript modules are always interpreted as strict mode. This has to be
+ // done before "hoistSymbols" because strict mode can alter hoisting (!).
+ if (p.es6_import_keyword.len > 0) {
+ p.module_scope.recursiveSetStrictMode(js_ast.StrictModeKind.implicit_strict_mode_import);
+ } else if (p.es6_export_keyword.len > 0) {
+ p.module_scope.recursiveSetStrictMode(js_ast.StrictModeKind.implicit_strict_mode_export);
+ } else if (p.top_level_await_keyword.len > 0) {
+ p.module_scope.recursiveSetStrictMode(js_ast.StrictModeKind.implicit_strict_mode_top_level_await);
+ }
+
+ p.hoistSymbols(p.module_scope);
+
+ p.require_ref = try p.newSymbol(.unbound, "require");
+ p.exports_ref = try p.newSymbol(.hoisted, "exports");
+ p.module_ref = try p.newSymbol(.hoisted, "module");
+ }
+
+ pub fn hoistSymbols(p: *P, scope: *js_ast.Scope) void {
+ if (!scope.kindStopsHoisting()) {
+ var iter = scope.members.iterator();
+ nextMember: while (iter.next()) |res| {
+ var symbol = p.symbols.items[res.value.ref.inner_index];
+ if (!symbol.isHoisted()) {
+ continue :nextMember;
+ }
+ }
+ }
+ }
+
+ pub fn unshiftScopeOrder(self: *P) !ScopeOrder {
+ if (self.scopes_in_order.items.len == 0) {
+ var scope = try js_ast.Scope.initPtr(self.allocator);
+ return ScopeOrder{
+ .scope = scope,
+ .loc = logger.Loc.Empty,
+ };
+ } else {
+ return self.scopes_in_order.orderedRemove(0);
+ }
+ }
+
+ pub fn pushScopeForVisitPass(p: *P, kind: js_ast.Scope.Kind, loc: logger.Loc) !void {
+ var order = try p.unshiftScopeOrder();
+
+ // Sanity-check that the scopes generated by the first and second passes match
+ if (!order.loc.eql(loc) or order.scope.kind != kind) {
+ p.panic("Expected scope ({s}, {d}) in {s}, found scope ({s}, {d})", .{ kind, loc.start, p.source.path.pretty, order.scope.kind, order.loc.start });
+ }
+
+ p.current_scope = order.scope;
+
+ try p.scopes_for_current_part.append(order.scope);
+ }
+
+ pub fn pushScopeForParsePass(p: *P, kind: js_ast.Scope.Kind, loc: logger.Loc) !usize {
+ debugl("<pushScopeForParsePass>");
+ defer debugl("</pushScopeForParsePass>");
+ var scope = try Scope.initPtr(p.allocator);
+ scope.kind = kind;
+ scope.label_ref = null;
+
+ var parent: *Scope = undefined;
+
+ if (kind != .entry) {
+ parent = p.current_scope;
+ scope.parent = parent;
+ try parent.children.append(scope);
+ scope.strict_mode = parent.strict_mode;
+ }
+
+ p.current_scope = scope;
+
+ // Enforce that scope locations are strictly increasing to help catch bugs
+ // where the pushed scopes are mistmatched between the first and second passes
+ if (p.scopes_in_order.items.len > 0) {
+ const prev_start = p.scopes_in_order.items[p.scopes_in_order.items.len - 1].loc.start;
+ if (prev_start >= loc.start) {
+ p.panic("Scope location {d} must be greater than {d}", .{ loc.start, prev_start });
+ }
+ }
+
+ // Copy down function arguments into the function body scope. That way we get
+ // errors if a statement in the function body tries to re-declare any of the
+ // arguments.
+ if (kind == js_ast.Scope.Kind.function_body) {
+ if (parent.kind != js_ast.Scope.Kind.function_args) {
+ p.panic("Internal error", .{});
+ }
+
+ var iter = scope.parent.?.members.iterator();
+ while (iter.next()) |entry| {
+ // // Don't copy down the optional function expression name. Re-declaring
+ // // the name of a function expression is allowed.
+ const adjacent_symbols = p.symbols.items[entry.value.ref.inner_index];
+ if (adjacent_symbols.kind != .hoisted_function) {
+ try scope.members.put(entry.key, entry.value);
+ }
+ }
+ }
+
+ // Remember the length in case we call popAndDiscardScope() later
+ const scope_index = p.scopes_in_order.items.len;
+ try p.scopes_in_order.append(ScopeOrder{ .loc = loc, .scope = scope });
+
+ return scope_index;
+ }
+
+ // Note: do not write to "p.log" in this function. Any errors due to conversion
+ // from expression to binding should be written to "invalidLog" instead. That
+ // way we can potentially keep this as an expression if it turns out it's not
+ // needed as a binding after all.
+ pub fn convertExprToBinding(p: *P, expr: ExprNodeIndex, invalid_loc: *LocList) ?Binding {
+ switch (expr.data) {
+ .e_missing => {
+ return p.b(B.Missing{}, expr.loc);
+ },
+ .e_identifier => |ex| {
+ return p.b(B.Identifier{ .ref = ex.ref }, expr.loc);
+ },
+ .e_array => |ex| {
+ if (ex.comma_after_spread) |spread| {
+ invalid_loc.append(spread) catch unreachable;
+ }
+
+ if (ex.is_parenthesized) {
+ invalid_loc.append(p.source.rangeOfOperatorBefore(expr.loc, "(").loc) catch unreachable;
+ }
+
+ // p.markSyntaxFeature(Destructing)
+ var items = List(js_ast.ArrayBinding).init(p.allocator);
+ for (items.items) |item| {
+ var is_spread = true;
+ switch (item.default_value.?.data) {
+ .e_identifier => {},
+ else => {
+ // nested rest binding
+ // p.markSyntaxFeature(compat.NestedRestBinding, p.source.RangeOfOperatorAfter(item.Loc, "["))
+ },
+ }
+ var _expr = expr;
+ const res = p.convertExprToBindingAndInitializer(&_expr, invalid_loc, is_spread);
+ assert(res.binding != null);
+ items.append(js_ast.ArrayBinding{ .binding = res.binding orelse unreachable, .default_value = res.override_expr }) catch unreachable;
+ }
+
+ return p.b(B.Array{
+ .items = items.toOwnedSlice(),
+ .has_spread = ex.comma_after_spread != null,
+ .is_single_line = ex.is_single_line,
+ }, expr.loc);
+ },
+ .e_object => |ex| {
+ if (ex.comma_after_spread) |sp| {
+ invalid_loc.append(sp) catch unreachable;
+ }
+
+ if (ex.is_parenthesized) {
+ invalid_loc.append(p.source.rangeOfOperatorBefore(expr.loc, "(").loc) catch unreachable;
+ }
+ // p.markSyntaxFeature(compat.Destructuring, p.source.RangeOfOperatorAfter(expr.Loc, "{"))
+
+ var properties = List(B.Property).init(p.allocator);
+ for (ex.properties) |item| {
+ if (item.flags.is_method or item.kind == .get or item.kind == .set) {
+ invalid_loc.append(item.key.?.loc) catch unreachable;
+ continue;
+ }
+ var value = &(item.value orelse unreachable);
+ const tup = p.convertExprToBindingAndInitializer(value, invalid_loc, false);
+ const initializer = tup.expr orelse item.initializer;
+
+ properties.append(B.Property{
+ .flags = Flags.Property{
+ .is_spread = item.kind == .spread,
+ .is_computed = item.flags.is_computed,
+ },
+
+ .key = item.key orelse p.panic("Internal error: Expected {s} to have a key.", .{item}),
+ .value = tup.binding orelse p.panic("Internal error: Expected {s} to have a binding.", .{tup}),
+ .default_value = initializer,
+ }) catch unreachable;
+ }
+
+ return p.b(B.Object{
+ .properties = properties.toOwnedSlice(),
+ .is_single_line = ex.is_single_line,
+ }, expr.loc);
+ },
+ else => {
+ invalid_loc.append(expr.loc) catch unreachable;
+ return null;
+ },
+ }
+
+ return null;
+ }
+
+ pub fn convertExprToBindingAndInitializer(p: *P, expr: *ExprNodeIndex, invalid_log: *LocList, is_spread: bool) ExprBindingTuple {
+ var initializer: ?ExprNodeIndex = null;
+ var override: ?ExprNodeIndex = null;
+ // zig syntax is sometimes painful
+ switch (expr.*.data) {
+ .e_binary => |bin| {
+ if (bin.op == .bin_assign) {
+ initializer = bin.right;
+ override = bin.left;
+ }
+ },
+ else => {},
+ }
+
+ var bind = p.convertExprToBinding(expr.*, invalid_log);
+ if (initializer) |initial| {
+ const equalsRange = p.source.rangeOfOperatorBefore(initial.loc, "=");
+ if (is_spread) {
+ p.log.addRangeError(p.source, equalsRange, "A rest argument cannot have a default initializer") catch unreachable;
+ } else {
+ // p.markSyntaxFeature();
+ }
+ }
+ return ExprBindingTuple{ .binding = bind, .expr = initializer };
+ }
+
+ pub fn forbidLexicalDecl(p: *P, loc: logger.Loc) !void {
+ try p.log.addRangeError(p.source, p.lexer.range(), "Cannot use a declaration in a single-statement context");
+ }
+
+ pub fn logExprErrors(p: *P, errors: *DeferredErrors) void {
+ if (errors.invalid_expr_default_value) |r| {
+ p.log.addRangeError(
+ p.source,
+ r,
+ "Unexpected \"=\"",
+ ) catch unreachable;
+ }
+
+ if (errors.invalid_expr_after_question) |r| {
+ p.log.addRangeErrorFmt(p.source, r, p.allocator, "Unexpected {s}", .{p.source.contents[r.loc.i()..r.endI()]}) catch unreachable;
+ }
+
+ // if (errors.array_spread_feature) |err| {
+ // p.markSyntaxFeature(compat.ArraySpread, errors.arraySpreadFeature)
+ // }
+ }
+
+ // This assumes the "function" token has already been parsed
+
+ pub fn parseFnStmt(p: *P, loc: logger.Loc, opts: *ParseStatementOptions, asyncRange: ?logger.Range) !Stmt {
+ const isGenerator = p.lexer.token == T.t_asterisk;
+ const isAsync = asyncRange != null;
+
+ // if isGenerator {
+ // p.markSyntaxFeature(compat.Generator, p.lexer.Range())
+ // p.lexer.Next()
+ // } else if isAsync {
+ // p.markLoweredSyntaxFeature(compat.AsyncAwait, asyncRange, compat.Generator)
+ // }
+
+ switch (opts.lexical_decl) {
+ .forbid => {
+ try p.forbidLexicalDecl(loc);
+ },
+
+ // Allow certain function statements in certain single-statement contexts
+ .allow_fn_inside_if, .allow_fn_inside_label => {
+ if (opts.is_typescript_declare or isGenerator or isAsync) {
+ try p.forbidLexicalDecl(loc);
+ }
+ },
+ else => {},
+ }
+
+ var name: ?js_ast.LocRef = null;
+ var nameText: string = undefined;
+
+ // The name is optional for "export default function() {}" pseudo-statements
+ if (!opts.is_name_optional or p.lexer.token == T.t_identifier) {
+ var nameLoc = p.lexer.loc();
+ nameText = p.lexer.identifier;
+ p.lexer.expect(T.t_identifier);
+ // Difference
+ const ref = try p.newSymbol(Symbol.Kind.other, nameText);
+ name = js_ast.LocRef{
+ .loc = nameLoc,
+ .ref = ref,
+ };
+ }
+
+ // Even anonymous functions can have TypeScript type parameters
+ if (p.options.ts) {
+ p.skipTypescriptTypeParameters();
+ }
+
+ // Introduce a fake block scope for function declarations inside if statements
+ var ifStmtScopeIndex: usize = 0;
+ var hasIfScope = opts.lexical_decl == .allow_fn_inside_if;
+ if (hasIfScope) {
+ ifStmtScopeIndex = try p.pushScopeForParsePass(js_ast.Scope.Kind.block, loc);
+ }
+
+ var scopeIndex = try p.pushScopeForParsePass(js_ast.Scope.Kind.function_args, p.lexer.loc());
+ var func = p.parseFn(name, FnOrArrowDataParse{
+ .async_range = asyncRange,
+ .allow_await = if (isAsync) AwaitOrYield.allow_expr else AwaitOrYield.allow_ident,
+ .allow_yield = if (isGenerator) AwaitOrYield.allow_expr else AwaitOrYield.allow_ident,
+ .is_typescript_declare = opts.is_typescript_declare,
+
+ // Only allow omitting the body if we're parsing TypeScript
+ .allow_missing_body_for_type_script = p.options.ts,
+ });
+
+ // Don't output anything if it's just a forward declaration of a function
+ if (opts.is_typescript_declare or func.body == null) {
+ p.popAndDiscardScope(scopeIndex);
+
+ // Balance the fake block scope introduced above
+ if (hasIfScope) {
+ p.popScope();
+ }
+
+ if (opts.is_typescript_declare and opts.is_namespace_scope and opts.is_export) {
+ p.has_non_local_export_declare_inside_namespace = true;
+ }
+
+ return p.s(S.TypeScript{}, loc);
+ }
+
+ p.popScope();
+
+ // Only declare the function after we know if it had a body or not. Otherwise
+ // TypeScript code such as this will double-declare the symbol:
+ //
+ // function foo(): void;
+ // function foo(): void {}
+ //
+ if (name) |*name_| {
+ const kind = if (isGenerator or isAsync) Symbol.Kind.generator_or_async_function else Symbol.Kind.hoisted_function;
+ name_.ref = try p.declareSymbol(kind, name_.loc, nameText);
+ }
+ func.name = name;
+
+ func.flags.has_if_scope = hasIfScope;
+
+ func.flags.is_export = opts.is_export;
+
+ // Balance the fake block scope introduced above
+ if (hasIfScope) {
+ p.popScope();
+ }
+
+ return p.s(S.Function{
+ .func = func,
+ }, func.open_parens_loc);
+ }
+
+ pub fn popAndDiscardScope(p: *P, scope_index: usize) void {
+ // Move up to the parent scope
+ var to_discard = p.current_scope;
+ var parent = to_discard.parent orelse unreachable;
+
+ p.current_scope = parent;
+
+ // Truncate the scope order where we started to pretend we never saw this scope
+ p.scopes_in_order.shrinkRetainingCapacity(scope_index);
+
+ var children = parent.children;
+ // Remove the last child from the parent scope
+ var last = children.items.len - 1;
+ if (children.items[last] != to_discard) {
+ p.panic("Internal error", .{});
+ }
+
+ _ = children.popOrNull();
+ }
+
+ pub fn parseFn(p: *P, name: ?js_ast.LocRef, opts: FnOrArrowDataParse) G.Fn {
+ // if data.allowAwait and data.allowYield {
+ // p.markSyntaxFeature(compat.AsyncGenerator, data.asyncRange)
+ // }
+
+ var func = G.Fn{
+ .name = name,
+ .flags = Flags.Function{
+ .has_rest_arg = false,
+ .is_async = opts.allow_await == .allow_expr,
+ .is_generator = opts.allow_yield == .allow_expr,
+ },
+
+ .arguments_ref = null,
+ .open_parens_loc = p.lexer.loc(),
+ };
+ p.lexer.expect(T.t_open_paren);
+
+ // Await and yield are not allowed in function arguments
+ var old_fn_or_arrow_data = opts;
+ p.fn_or_arrow_data_parse.allow_await = if (opts.allow_await == .allow_expr) AwaitOrYield.forbid_all else AwaitOrYield.allow_ident;
+ p.fn_or_arrow_data_parse.allow_yield = if (opts.allow_yield == .allow_expr) AwaitOrYield.forbid_all else AwaitOrYield.allow_ident;
+
+ // If "super()" is allowed in the body, it's allowed in the arguments
+ p.fn_or_arrow_data_parse.allow_super_call = opts.allow_super_call;
+ var args = List(G.Arg).init(p.allocator);
+ while (p.lexer.token != T.t_close_paren) {
+ // Skip over "this" type annotations
+ if (p.options.ts and p.lexer.token == T.t_this) {
+ p.lexer.next();
+ if (p.lexer.token == T.t_colon) {
+ p.lexer.next();
+ p.skipTypescriptType(js_ast.Op.Level.lowest);
+ }
+ if (p.lexer.token != T.t_comma) {
+ break;
+ }
+
+ p.lexer.next();
+ continue;
+ }
+
+ var ts_decorators: []ExprNodeIndex = undefined;
+ if (opts.allow_ts_decorators) {
+ ts_decorators = p.parseTypeScriptDecorators();
+ }
+
+ if (!func.flags.has_rest_arg and p.lexer.token == T.t_dot_dot_dot) {
+ // p.markSyntaxFeature
+ p.lexer.next();
+ func.flags.has_rest_arg = true;
+ }
+
+ var is_typescript_ctor_field = false;
+ var is_identifier = p.lexer.token == T.t_identifier;
+ var text = p.lexer.identifier;
+ var arg = p.parseBinding();
+
+ if (p.options.ts and is_identifier and opts.is_constructor) {
+ // Skip over TypeScript accessibility modifiers, which turn this argument
+ // into a class field when used inside a class constructor. This is known
+ // as a "parameter property" in TypeScript.
+ while (true) {
+ switch (p.lexer.token) {
+ .t_identifier, .t_open_brace, .t_open_bracket => {
+ if (!js_lexer.TypeScriptAccessibilityModifier.has(p.lexer.identifier)) {
+ break;
+ }
+
+ is_typescript_ctor_field = true;
+
+ // TypeScript requires an identifier binding
+ if (p.lexer.token != .t_identifier) {
+ p.lexer.expect(.t_identifier);
+ }
+ text = p.lexer.identifier;
+
+ // Re-parse the binding (the current binding is the TypeScript keyword)
+ arg = p.parseBinding();
+ },
+ else => {
+ break;
+ },
+ }
+ }
+
+ // "function foo(a?) {}"
+ if (p.lexer.token == .t_question) {
+ p.lexer.next();
+ }
+
+ // "function foo(a: any) {}"
+ if (p.lexer.token == .t_colon) {
+ p.lexer.next();
+ p.skipTypescriptType(.lowest);
+ }
+ }
+
+ var parseStmtOpts = ParseStatementOptions{};
+ p.declareBinding(.hoisted, arg, &parseStmtOpts) catch unreachable;
+
+ var default_value: ?ExprNodeIndex = null;
+ if (!func.flags.has_rest_arg and p.lexer.token == .t_equals) {
+ // p.markSyntaxFeature
+ p.lexer.next();
+ default_value = p.parseExpr(.comma);
+ }
+
+ args.append(G.Arg{
+ .ts_decorators = ts_decorators,
+ .binding = arg,
+ .default = default_value,
+
+ // We need to track this because it affects code generation
+ .is_typescript_ctor_field = is_typescript_ctor_field,
+ }) catch unreachable;
+
+ if (p.lexer.token != .t_comma) {
+ break;
+ }
+
+ if (func.flags.has_rest_arg) {
+ // JavaScript does not allow a comma after a rest argument
+ if (opts.is_typescript_declare) {
+ // TypeScript does allow a comma after a rest argument in a "declare" context
+ p.lexer.next();
+ } else {
+ p.lexer.expect(.t_close_paren);
+ }
+
+ break;
+ }
+
+ p.lexer.next();
+ }
+ func.args = args.toOwnedSlice();
+
+ // Reserve the special name "arguments" in this scope. This ensures that it
+ // shadows any variable called "arguments" in any parent scopes. But only do
+ // this if it wasn't already declared above because arguments are allowed to
+ // be called "arguments", in which case the real "arguments" is inaccessible.
+ if (!p.current_scope.members.contains("arguments")) {
+ func.arguments_ref = p.declareSymbol(.arguments, func.open_parens_loc, "arguments") catch unreachable;
+ p.symbols.items[func.arguments_ref.?.inner_index].must_not_be_renamed = true;
+ }
+
+ p.lexer.expect(.t_close_paren);
+ p.fn_or_arrow_data_parse = old_fn_or_arrow_data;
+
+ // "function foo(): any {}"
+ if (p.options.ts and p.lexer.token == .t_colon) {
+ p.lexer.next();
+ p.skipTypescriptReturnType();
+ }
+
+ // "function foo(): any;"
+ if (opts.allow_missing_body_for_type_script and p.lexer.token != .t_open_brace) {
+ p.lexer.expectOrInsertSemicolon();
+ return func;
+ }
+ var tempOpts = opts;
+ func.body = p.parseFnBody(&tempOpts) catch unreachable;
+
+ return func;
+ }
+
+ // pub fn parseBinding(p: *P)
+
+ // TODO:
+ pub fn skipTypescriptReturnType(p: *P) void {
+ notimpl();
+ }
+
+ // TODO:
+ pub fn parseTypeScriptDecorators(p: *P) []ExprNodeIndex {
+ if (!p.options.ts) {
+ return &([_]ExprNodeIndex{});
+ }
+
+ var decorators = List(ExprNodeIndex).init(p.allocator);
+ while (p.lexer.token == T.t_at) {
+ p.lexer.next();
+
+ // Parse a new/call expression with "exprFlagTSDecorator" so we ignore
+ // EIndex expressions, since they may be part of a computed property:
+ //
+ // class Foo {
+ // @foo ['computed']() {}
+ // }
+ //
+ // This matches the behavior of the TypeScript compiler.
+ decorators.append(p.parseExprWithFlags(.new, Expr.EFlags.ts_decorator)) catch unreachable;
+ }
+
+ return decorators.toOwnedSlice();
+ }
+
+ // TODO:
+ pub fn skipTypescriptType(p: *P, level: js_ast.Op.Level) void {
+ notimpl();
+ }
+
+ // TODO:
+ pub fn skipTypescriptTypeParameters(p: *P) void {
+ notimpl();
+ }
+
+ fn createDefaultName(p: *P, loc: logger.Loc) !js_ast.LocRef {
+ var identifier = try std.fmt.allocPrint(p.allocator, "{s}_default", .{p.source.identifier_name});
+
+ const name = js_ast.LocRef{ .loc = loc, .ref = try p.newSymbol(Symbol.Kind.other, identifier) };
+
+ var scope = p.current_scope;
+
+ try scope.generated.append(name.ref orelse unreachable);
+
+ return name;
+ }
+
+ pub fn newSymbol(p: *P, kind: Symbol.Kind, identifier: string) !js_ast.Ref {
+ const ref = js_ast.Ref{
+ .source_index = @intCast(Ref.Int, p.source.index),
+ .inner_index = @intCast(Ref.Int, p.symbols.items.len),
+ };
+ try p.symbols.append(Symbol{
+ .kind = kind,
+ .original_name = identifier,
+ .link = null,
+ });
+
+ if (p.options.ts) {
+ try p.ts_use_counts.append(0);
+ }
+
+ return ref;
+ }
+
+ pub fn parseLabelName(p: *P) !?js_ast.LocRef {
+ if (p.lexer.token != .t_identifier or p.lexer.has_newline_before) {
+ return null;
+ }
+
+ const name = LocRef{ .loc = p.lexer.loc(), .ref = try p.storeNameInRef(p.lexer.identifier) };
+ p.lexer.next();
+ return name;
+ }
+
+ pub fn parseClassStmt(p: *P, loc: logger.Loc, opts: *ParseStatementOptions) Stmt {
+ var name: ?js_ast.LocRef = null;
+ var class_keyword = p.lexer.range();
+ if (p.lexer.token == .t_class) {
+ //marksyntaxfeature
+ p.lexer.next();
+ } else {
+ p.lexer.expected(.t_class);
+ }
+
+ var is_identifier = p.lexer.token == .t_identifier;
+ var is_strict_modereserved_word = is_identifier and js_lexer.StrictModeReservedWords.has(p.lexer.identifier);
+
+ if (!opts.is_name_optional or (is_identifier and !is_strict_modereserved_word)) {
+ var name_loc = p.lexer.loc();
+ var name_text = p.lexer.identifier;
+ if (is_strict_modereserved_word) {
+ p.lexer.unexpected();
+ }
+
+ p.lexer.expect(.t_identifier);
+ name = LocRef{ .loc = name_loc, .ref = null };
+ if (!opts.is_typescript_declare) {
+ (name orelse unreachable).ref = p.declareSymbol(.class, name_loc, name_text) catch unreachable;
+ }
+ }
+
+ // Even anonymous classes can have TypeScript type parameters
+ if (p.options.ts) {
+ p.skipTypescriptTypeParameters();
+ }
+ var class_opts = ParseClassOptions{
+ .allow_ts_decorators = true,
+ .is_type_script_declare = opts.is_typescript_declare,
+ };
+ if (opts.ts_decorators) |dec| {
+ class_opts.ts_decorators = dec.values;
+ }
+
+ var scope_index = p.pushScopeForParsePass(.class_name, loc) catch unreachable;
+ var class = p.parseClass(class_keyword, name, class_opts);
+
+ if (opts.is_typescript_declare) {
+ p.popAndDiscardScope(scope_index);
+ if (opts.is_namespace_scope and opts.is_export) {
+ p.has_non_local_export_declare_inside_namespace = true;
+ }
+
+ return p.s(S.TypeScript{}, loc);
+ }
+
+ p.popScope();
+ return p.s(S.Class{
+ .class = class,
+ .is_export = opts.is_export,
+ }, loc);
+ }
+
+ pub fn parseStmt(p: *P, opts: *ParseStatementOptions) !Stmt {
+ var loc = p.lexer.loc();
+
+ switch (p.lexer.token) {
+ .t_semicolon => {
+ p.lexer.next();
+ return Stmt.empty();
+ },
+
+ .t_export => {
+ var previousExportKeyword = p.es6_export_keyword;
+ if (opts.is_module_scope) {
+ p.es6_export_keyword = p.lexer.range();
+ } else if (!opts.is_namespace_scope) {
+ p.lexer.unexpected();
+ }
+ p.lexer.next();
+
+ // TypeScript decorators only work on class declarations
+ // "@decorator export class Foo {}"
+ // "@decorator export abstract class Foo {}"
+ // "@decorator export default class Foo {}"
+ // "@decorator export default abstract class Foo {}"
+ // "@decorator export declare class Foo {}"
+ // "@decorator export declare abstract class Foo {}"
+ if (opts.ts_decorators != null and p.lexer.token != js_lexer.T.t_class and p.lexer.token != js_lexer.T.t_default and !p.lexer.isContextualKeyword("abstract") and !p.lexer.isContextualKeyword("declare")) {
+ p.lexer.expected(js_lexer.T.t_class);
+ }
+
+ switch (p.lexer.token) {
+ T.t_class, T.t_const, T.t_function, T.t_var => {
+ opts.is_export = true;
+ return p.parseStmt(opts);
+ },
+
+ T.t_import => {
+ // "export import foo = bar"
+ if (p.options.ts and (opts.is_module_scope or opts.is_namespace_scope)) {
+ opts.is_export = true;
+ return p.parseStmt(opts);
+ }
+
+ p.lexer.unexpected();
+ },
+
+ T.t_enum => {
+ if (!p.options.ts) {
+ p.lexer.unexpected();
+ }
+
+ opts.is_export = true;
+ return p.parseStmt(opts);
+ },
+
+ T.t_identifier => {
+ if (p.lexer.isContextualKeyword("let")) {
+ opts.is_export = true;
+ return p.parseStmt(opts);
+ }
+
+ if (opts.is_typescript_declare and p.lexer.isContextualKeyword("as")) {
+ // "export as namespace ns;"
+ p.lexer.next();
+ p.lexer.expectContextualKeyword("namespace");
+ p.lexer.expect(T.t_identifier);
+ p.lexer.expectOrInsertSemicolon();
+
+ return p.s(S.TypeScript{}, loc);
+ }
+
+ if (p.lexer.isContextualKeyword("async")) {
+ var asyncRange = p.lexer.range();
+ p.lexer.next();
+ if (p.lexer.has_newline_before) {
+ try p.log.addRangeError(p.source, asyncRange, "Unexpected newline after \"async\"");
+ }
+
+ p.lexer.expect(T.t_function);
+ opts.is_export = true;
+ return try p.parseFnStmt(loc, opts, asyncRange);
+ }
+
+ if (p.options.ts) {
+ notimpl();
+
+ // switch (p.lexer.identifier) {
+ // "type" => {
+ // // "export type foo = ..."
+ // const typeRange = p.lexer.range();
+ // if (p.lexer.has_newline_before) {
+ // p.lexer.addError(p.source, typeRange.end(), "Unexpected newline after \"type\"");
+ // return;
+ // }
+
+ // },
+ // }
+ }
+
+ p.lexer.unexpected();
+ lexerpanic();
+ },
+
+ T.t_default => {
+ if (!opts.is_module_scope and (!opts.is_namespace_scope or !opts.is_typescript_declare)) {
+ p.lexer.unexpected();
+ lexerpanic();
+ }
+
+ var defaultLoc = p.lexer.loc();
+ p.lexer.next();
+
+ // TypeScript decorators only work on class declarations
+ // "@decorator export default class Foo {}"
+ // "@decorator export default abstract class Foo {}"
+ if (opts.ts_decorators != null and p.lexer.token != T.t_class and !p.lexer.isContextualKeyword("abstract")) {
+ p.lexer.expected(T.t_class);
+ }
+
+ if (p.lexer.isContextualKeyword("async")) {
+ var async_range = p.lexer.range();
+ p.lexer.next();
+ var defaultName: js_ast.LocRef = undefined;
+ if (p.lexer.token == T.t_function and !p.lexer.has_newline_before) {
+ p.lexer.next();
+ var stmtOpts = ParseStatementOptions{
+ .is_name_optional = true,
+ .lexical_decl = .allow_all,
+ };
+ var stmt = try p.parseFnStmt(loc, &stmtOpts, async_range);
+ if (@as(Stmt.Tag, stmt.data) == .s_type_script) {
+ // This was just a type annotation
+ return stmt;
+ }
+
+ if (stmt.data.s_function.func.name) |name| {
+ defaultName = js_ast.LocRef{ .loc = defaultLoc, .ref = name.ref };
+ } else {
+ defaultName = try p.createDefaultName(defaultLoc);
+ }
+ // this is probably a panic
+ var value = js_ast.StmtOrExpr{ .stmt = stmt };
+ return p.s(S.ExportDefault{ .default_name = defaultName, .value = value }, loc);
+ }
+
+ defaultName = try createDefaultName(p, loc);
+
+ var expr = p.parseSuffix(try p.parseAsyncPrefixExpr(async_range, Level.comma), Level.comma, null, Expr.EFlags.none);
+ p.lexer.expectOrInsertSemicolon();
+ // this is probably a panic
+ var value = js_ast.StmtOrExpr{ .expr = expr };
+ return p.s(S.ExportDefault{ .default_name = defaultName, .value = value }, loc);
+ }
+
+ if (p.lexer.token == .t_function or p.lexer.token == .t_class or p.lexer.isContextualKeyword("interface")) {
+ var _opts = ParseStatementOptions{
+ .ts_decorators = opts.ts_decorators,
+ .is_name_optional = true,
+ .lexical_decl = .allow_all,
+ };
+ var stmt = p.parseStmt(&_opts) catch unreachable;
+
+ var default_name: js_ast.LocRef = undefined;
+
+ switch (stmt.data) {
+ // This was just a type annotation
+ .s_type_script => {
+ return stmt;
+ },
+
+ .s_function => |func_container| {
+ if (func_container.func.name) |name| {
+ default_name = LocRef{ .loc = defaultLoc, .ref = name.ref };
+ } else {}
+ },
+ .s_class => |class| {
+ if (class.class.class_name) |name| {
+ default_name = LocRef{ .loc = defaultLoc, .ref = name.ref };
+ } else {}
+ },
+ else => {
+ p.panic("Internal error: unexpected stmt {s}", .{stmt});
+ },
+ }
+
+ return p.s(
+ S.ExportDefault{ .default_name = default_name, .value = js_ast.StmtOrExpr{ .stmt = stmt } },
+ loc,
+ );
+ }
+
+ const is_identifier = p.lexer.token == .t_identifier;
+ const name = p.lexer.identifier;
+ var expr = p.parseExpr(.comma);
+
+ // Handle the default export of an abstract class in TypeScript
+ if (p.options.ts and is_identifier and (p.lexer.token == .t_class or opts.ts_decorators != null) and strings.eql(name, "abstract")) {
+ switch (expr.data) {
+ .e_identifier => |ident| {
+ var stmtOpts = ParseStatementOptions{
+ .ts_decorators = opts.ts_decorators,
+ .is_name_optional = true,
+ };
+ const stmt: Stmt = p.parseClassStmt(loc, &stmtOpts);
+
+ // Use the statement name if present, since it's a better name
+ var default_name: LocRef = undefined;
+ switch (stmt.data) {
+ .s_class => |class| {
+ var ref: Ref = undefined;
+ var picked = false;
+ if (class.class.class_name) |loc_ref| {
+ if (loc_ref.ref) |_ref| {
+ ref = _ref;
+ picked = true;
+ }
+ }
+
+ if (!picked) {
+ ref = (createDefaultName(p, defaultLoc) catch unreachable).ref orelse unreachable;
+ }
+ default_name = LocRef{ .loc = defaultLoc, .ref = ref };
+ },
+ else => {
+ default_name = createDefaultName(p, defaultLoc) catch unreachable;
+ },
+ }
+
+ return p.s(S.ExportDefault{ .default_name = default_name, .value = js_ast.StmtOrExpr{ .stmt = stmt } }, loc);
+ },
+ else => {
+ p.panic("internal error: unexpected", .{});
+ },
+ }
+ }
+
+ p.lexer.expectOrInsertSemicolon();
+ return p.s(S.ExportDefault{ .default_name = createDefaultName(p, loc) catch unreachable, .value = js_ast.StmtOrExpr{ .expr = expr } }, loc);
+ },
+ T.t_asterisk => {
+ if (!opts.is_module_scope and !(opts.is_namespace_scope or !opts.is_typescript_declare)) {
+ p.lexer.unexpected();
+ }
+
+ p.lexer.next();
+ var namespace_ref: js_ast.Ref = undefined;
+ var alias: ?js_ast.G.ExportStarAlias = null;
+ var path_loc: logger.Loc = undefined;
+ var path_text: string = undefined;
+
+ if (p.lexer.isContextualKeyword("as")) {
+ // "export * as ns from 'path'"
+ const name = p.lexer.identifier;
+ namespace_ref = p.storeNameInRef(name) catch unreachable;
+ alias = G.ExportStarAlias{ .loc = p.lexer.loc(), .original_name = name };
+ if (!p.lexer.isIdentifierOrKeyword()) {
+ p.lexer.expect(.t_identifier);
+ }
+ p.checkForNonBMPCodePoint((alias orelse unreachable).loc, name);
+ p.lexer.next();
+ p.lexer.expectContextualKeyword("from");
+ const parsedPath = p.parsePath();
+ path_loc = parsedPath.loc;
+ path_text = parsedPath.text;
+ } else {
+ // "export * from 'path'"
+ p.lexer.expectContextualKeyword("from");
+ const parsedPath = p.parsePath();
+ path_loc = parsedPath.loc;
+ path_text = parsedPath.text;
+ var path_name = fs.PathName.init(strings.append(p.allocator, path_text, "_star") catch unreachable);
+ namespace_ref = p.storeNameInRef(path_name.nonUniqueNameString(p.allocator) catch unreachable) catch unreachable;
+ }
+
+ var import_record_index = p.addImportRecord(ImportKind.stmt, path_loc, path_text);
+ p.lexer.expectOrInsertSemicolon();
+ return p.s(S.ExportStar{
+ .namespace_ref = namespace_ref,
+ .alias = alias,
+ .import_record_index = import_record_index,
+ }, loc);
+ },
+ T.t_open_brace => {
+ if (!opts.is_module_scope and !(opts.is_namespace_scope or !opts.is_typescript_declare)) {
+ p.lexer.unexpected();
+ }
+
+ const export_clause = try p.parseExportClause();
+ if (p.lexer.isContextualKeyword("from")) {
+ p.lexer.expectContextualKeyword("from");
+ const parsedPath = p.parsePath();
+ const import_record_index = p.addImportRecord(.stmt, parsedPath.loc, parsedPath.text);
+ var path_name = fs.PathName.init(strings.append(p.allocator, "import_", parsedPath.text) catch unreachable);
+ const namespace_ref = p.storeNameInRef(path_name.nonUniqueNameString(p.allocator) catch unreachable) catch unreachable;
+ p.lexer.expectOrInsertSemicolon();
+ return p.s(S.ExportFrom{ .items = export_clause.clauses, .is_single_line = export_clause.is_single_line, .namespace_ref = namespace_ref, .import_record_index = import_record_index }, loc);
+ }
+ p.lexer.expectOrInsertSemicolon();
+ return p.s(S.ExportClause{ .items = export_clause.clauses, .is_single_line = export_clause.is_single_line }, loc);
+ },
+ T.t_equals => {
+ // "export = value;"
+
+ p.es6_export_keyword = previousExportKeyword; // This wasn't an ESM export statement after all
+ if (p.options.ts) {
+ p.lexer.next();
+ var value = p.parseExpr(.lowest);
+ p.lexer.expectOrInsertSemicolon();
+ return p.s(S.ExportEquals{ .value = value }, loc);
+ }
+ p.lexer.unexpected();
+ return Stmt.empty();
+ },
+ else => {
+ p.lexer.unexpected();
+ return Stmt.empty();
+ },
+ }
+ },
+
+ .t_function => {
+ p.lexer.next();
+ return p.parseFnStmt(loc, opts, null);
+ },
+ .t_enum => {
+ if (!p.options.ts) {
+ p.lexer.unexpected();
+ }
+ return p.parseTypescriptEnumStmt(loc, opts);
+ },
+ .t_at => {
+ // Parse decorators before class statements, which are potentially exported
+ if (p.options.ts) {
+ const scope_index = p.scopes_in_order.items.len;
+ const ts_decorators = p.parseTypeScriptDecorators();
+
+ // If this turns out to be a "declare class" statement, we need to undo the
+ // scopes that were potentially pushed while parsing the decorator arguments.
+ // That can look like any one of the following:
+ //
+ // "@decorator declare class Foo {}"
+ // "@decorator declare abstract class Foo {}"
+ // "@decorator export declare class Foo {}"
+ // "@decorator export declare abstract class Foo {}"
+ //
+ opts.ts_decorators = DeferredTsDecorators{
+ .values = ts_decorators,
+ .scope_index = scope_index,
+ };
+
+ // "@decorator class Foo {}"
+ // "@decorator abstract class Foo {}"
+ // "@decorator declare class Foo {}"
+ // "@decorator declare abstract class Foo {}"
+ // "@decorator export class Foo {}"
+ // "@decorator export abstract class Foo {}"
+ // "@decorator export declare class Foo {}"
+ // "@decorator export declare abstract class Foo {}"
+ // "@decorator export default class Foo {}"
+ // "@decorator export default abstract class Foo {}"
+ if (p.lexer.token != .t_class and p.lexer.token != .t_export and !p.lexer.isContextualKeyword("abstract") and !p.lexer.isContextualKeyword("declare")) {
+ p.lexer.expected(.t_class);
+ }
+
+ return p.parseStmt(opts);
+ }
+ // notimpl();
+ },
+ .t_class => {
+ if (opts.lexical_decl != .allow_all) {
+ try p.forbidLexicalDecl(loc);
+ }
+
+ return p.parseClassStmt(loc, opts);
+ },
+ .t_var => {
+ p.lexer.next();
+ const decls = p.parseAndDeclareDecls(.hoisted, opts);
+ p.lexer.expectOrInsertSemicolon();
+ return p.s(S.Local{ .kind = .k_var, .decls = decls, .is_export = opts.is_export }, loc);
+ },
+ .t_const => {
+ if (opts.lexical_decl != .allow_all) {
+ try p.forbidLexicalDecl(loc);
+ }
+ // p.markSyntaxFeature(compat.Const, p.lexer.Range())
+
+ p.lexer.next();
+
+ if (p.options.ts and p.lexer.token == T.t_enum) {
+ return p.parseTypescriptEnumStmt(loc, opts);
+ }
+
+ const decls = p.parseAndDeclareDecls(.cconst, opts);
+ p.lexer.expectOrInsertSemicolon();
+
+ if (!opts.is_typescript_declare) {
+ try p.requireInitializers(decls);
+ }
+
+ return p.s(S.Local{ .kind = .k_const, .decls = decls, .is_export = opts.is_export }, loc);
+ },
+ .t_if => {
+ p.lexer.next();
+ p.lexer.expect(.t_open_paren);
+ const test_ = p.parseExpr(.lowest);
+ p.lexer.expect(.t_close_paren);
+ var stmtOpts = ParseStatementOptions{
+ .lexical_decl = .allow_fn_inside_if,
+ };
+ const yes = p.parseStmt(&stmtOpts) catch unreachable;
+ var no: ?Stmt = null;
+ if (p.lexer.token == .t_else) {
+ p.lexer.next();
+ stmtOpts = ParseStatementOptions{
+ .lexical_decl = .allow_fn_inside_if,
+ };
+ no = p.parseStmt(&stmtOpts) catch unreachable;
+ }
+
+ return p.s(S.If{
+ .test_ = test_,
+ .yes = yes,
+ .no = no,
+ }, loc);
+ },
+ .t_do => {
+ p.lexer.next();
+ var stmtOpts = ParseStatementOptions{};
+ const body = p.parseStmt(&stmtOpts) catch unreachable;
+ p.lexer.expect(.t_while);
+ p.lexer.expect(.t_open_paren);
+ const test_ = p.parseExpr(.lowest);
+ p.lexer.expect(.t_close_paren);
+
+ // This is a weird corner case where automatic semicolon insertion applies
+ // even without a newline present
+ if (p.lexer.token == .t_semicolon) {
+ p.lexer.next();
+ }
+ return p.s(S.DoWhile{ .body = body, .test_ = test_ }, loc);
+ },
+ .t_while => {
+ p.lexer.next();
+
+ p.lexer.expect(.t_open_paren);
+ const test_ = p.parseExpr(.lowest);
+ const body_loc = p.lexer.loc();
+ p.lexer.expect(.t_close_paren);
+
+ var stmtOpts = ParseStatementOptions{};
+
+ // Push a scope so we make sure to prevent any bare identifiers referenced
+ // within the body from being renamed. Renaming them might change the
+ // semantics of the code.
+ _ = try p.pushScopeForParsePass(.with, body_loc);
+ const body = p.parseStmt(&stmtOpts) catch unreachable;
+ p.popScope();
+
+ return p.s(S.With{ .body = body, .value = test_, .body_loc = body_loc }, loc);
+ },
+ .t_with => {
+ p.lexer.next();
+ p.lexer.expect(.t_open_paren);
+ const test_ = p.parseExpr(.lowest);
+ const body_loc = p.lexer.loc();
+ p.lexer.expect(.t_close_paren);
+ },
+ .t_switch => {
+ p.lexer.next();
+
+ p.lexer.expect(.t_open_paren);
+ const test_ = p.parseExpr(.lowest);
+ p.lexer.expect(.t_close_paren);
+
+ const body_loc = p.lexer.loc();
+ _ = try p.pushScopeForParsePass(.block, body_loc);
+ defer p.popScope();
+
+ p.lexer.expect(.t_open_brace);
+ var cases = List(js_ast.Case).init(p.allocator);
+ var foundDefault = false;
+ var stmtOpts = ParseStatementOptions{ .lexical_decl = .allow_all };
+ var value: ?js_ast.Expr = null;
+ while (p.lexer.token != .t_close_brace) {
+ var body = List(js_ast.Stmt).init(p.allocator);
+ value = null;
+ if (p.lexer.token == .t_default) {
+ if (foundDefault) {
+ try p.log.addRangeError(p.source, p.lexer.range(), "Multiple default clauses are not allowed");
+ fail();
+ }
+
+ foundDefault = true;
+ p.lexer.next();
+ p.lexer.expect(.t_colon);
+ } else {
+ p.lexer.expect(.t_case);
+ value = p.parseExpr(.lowest);
+ p.lexer.expect(.t_colon);
+ }
+
+ caseBody: while (true) {
+ switch (p.lexer.token) {
+ .t_close_brace, .t_case, .t_default => {
+ break :caseBody;
+ },
+ else => {
+ stmtOpts = ParseStatementOptions{ .lexical_decl = .allow_all };
+ try body.append(p.parseStmt(&stmtOpts) catch unreachable);
+ },
+ }
+ }
+ try cases.append(js_ast.Case{ .value = value, .body = body.toOwnedSlice(), .loc = logger.Loc.Empty });
+ }
+ p.lexer.expect(.t_close_brace);
+ return p.s(S.Switch{ .test_ = test_, .body_loc = body_loc, .cases = cases.toOwnedSlice() }, loc);
+ },
+ .t_try => {
+ p.lexer.next();
+ const body_loc = p.lexer.loc();
+ p.lexer.expect(.t_open_brace);
+ _ = try p.pushScopeForParsePass(.block, loc);
+ var stmtOpts = ParseStatementOptions{};
+ const body = p.parseStmtsUpTo(.t_close_brace, &stmtOpts) catch unreachable;
+ p.popScope();
+ p.lexer.next();
+
+ var catch_: ?js_ast.Catch = null;
+ var finally: ?js_ast.Finally = null;
+
+ if (p.lexer.token == .t_catch) {
+ const catch_loc = p.lexer.loc();
+ _ = try p.pushScopeForParsePass(.block, catch_loc);
+ p.lexer.next();
+ var binding: ?js_ast.Binding = null;
+
+ // The catch binding is optional, and can be omitted
+ // jarred: TIL!
+ if (p.lexer.token != .t_open_brace) {
+ p.lexer.expect(.t_open_paren);
+ const value = p.parseBinding();
+
+ // Skip over types
+ if (p.options.ts and p.lexer.token == .t_colon) {
+ p.lexer.expect(.t_colon);
+ p.skipTypescriptType(.lowest);
+ }
+
+ p.lexer.expect(.t_close_paren);
+
+ // Bare identifiers are a special case
+ var kind = Symbol.Kind.other;
+ switch (value.data) {
+ .b_identifier => {
+ kind = .catch_identifier;
+ },
+ else => {},
+ }
+ stmtOpts = ParseStatementOptions{};
+ try p.declareBinding(kind, value, &stmtOpts);
+ }
+
+ p.lexer.expect(.t_open_brace);
+ stmtOpts = ParseStatementOptions{};
+ const stmts = p.parseStmtsUpTo(.t_close_brace, &stmtOpts) catch unreachable;
+ p.lexer.next();
+ catch_ = js_ast.Catch{
+ .loc = catch_loc,
+ .binding = binding,
+ .body = stmts,
+ };
+ p.popScope();
+ }
+
+ if (p.lexer.token == .t_finally or catch_ == null) {
+ const finally_loc = p.lexer.loc();
+ _ = try p.pushScopeForParsePass(.block, finally_loc);
+ p.lexer.expect(.t_finally);
+ p.lexer.expect(.t_open_brace);
+ stmtOpts = ParseStatementOptions{};
+ const stmts = p.parseStmtsUpTo(.t_close_brace, &stmtOpts) catch unreachable;
+ p.lexer.next();
+ finally = js_ast.Finally{ .loc = finally_loc, .stmts = stmts };
+ p.popScope();
+ }
+
+ return p.s(
+ S.Try{ .body_loc = body_loc, .body = body, .catch_ = catch_, .finally = finally },
+ loc,
+ );
+ },
+ .t_for => {
+ _ = try p.pushScopeForParsePass(.block, loc);
+ defer p.popScope();
+
+ p.lexer.next();
+
+ // "for await (let x of y) {}"
+ var isForAwait = p.lexer.isContextualKeyword("await");
+ if (isForAwait) {
+ const await_range = p.lexer.range();
+ if (p.fn_or_arrow_data_parse.allow_await != .allow_expr) {
+ try p.log.addRangeError(p.source, await_range, "Cannot use \"await\" outside an async function");
+ isForAwait = false;
+ } else {
+ // TODO: improve error handling here
+ // didGenerateError := p.markSyntaxFeature(compat.ForAwait, awaitRange)
+ if (p.fn_or_arrow_data_parse.is_top_level) {
+ p.top_level_await_keyword = await_range;
+ // p.markSyntaxFeature(compat.TopLevelAwait, awaitRange)
+ }
+ }
+ p.lexer.next();
+ }
+
+ p.lexer.expect(.t_open_paren);
+
+ var init_: ?Stmt = null;
+ var test_: ?Expr = null;
+ var update: ?Expr = null;
+
+ // "in" expressions aren't allowed here
+ p.allow_in = false;
+
+ var bad_let_range: ?logger.Range = null;
+ if (p.lexer.isContextualKeyword("let")) {
+ bad_let_range = p.lexer.range();
+ }
+
+ var decls: []G.Decl = &([_]G.Decl{});
+ var init_loc = p.lexer.loc();
+ var is_var = false;
+ switch (p.lexer.token) {
+ // for (var )
+ .t_var => {
+ is_var = true;
+ p.lexer.next();
+ var stmtOpts = ParseStatementOptions{};
+ decls = p.parseAndDeclareDecls(.hoisted, &stmtOpts);
+ init_ = p.s(S.Local{ .kind = .k_const, .decls = decls }, init_loc);
+ },
+ // for (const )
+ .t_const => {
+ p.lexer.next();
+ var stmtOpts = ParseStatementOptions{};
+ decls = p.parseAndDeclareDecls(.cconst, &stmtOpts);
+ init_ = p.s(S.Local{ .kind = .k_const, .decls = decls }, init_loc);
+ },
+ // for (;)
+ .t_semicolon => {},
+ else => {
+ var stmtOpts = ParseStatementOptions{ .lexical_decl = .allow_all };
+
+ const res = try p.parseExprOrLetStmt(&stmtOpts);
+ switch (res.stmt_or_expr) {
+ .stmt => |stmt| {
+ bad_let_range = null;
+ init_ = stmt;
+ },
+ .expr => |expr| {
+ init_ = p.s(S.SExpr{
+ .value = expr,
+ }, init_loc);
+ },
+ }
+ },
+ }
+
+ // "in" expressions are allowed again
+ p.allow_in = true;
+
+ // Detect for-of loops
+ if (p.lexer.isContextualKeyword("of") or isForAwait) {
+ if (bad_let_range) |r| {
+ try p.log.addRangeError(p.source, r, "\"let\" must be wrapped in parentheses to be used as an expression here");
+ fail();
+ }
+
+ if (isForAwait and !p.lexer.isContextualKeyword("of")) {
+ if (init_) |init_stmt| {
+ p.lexer.expectedString("\"of\"");
+ } else {
+ p.lexer.unexpected();
+ }
+ }
+
+ try p.forbidInitializers(decls, "of", false);
+ p.lexer.next();
+ const value = p.parseExpr(.comma);
+ p.lexer.expect(.t_close_paren);
+ var stmtOpts = ParseStatementOptions{};
+ const body = p.parseStmt(&stmtOpts) catch unreachable;
+ return p.s(S.ForOf{ .is_await = isForAwait, .init = init_ orelse unreachable, .value = value, .body = body }, loc);
+ }
+
+ // Detect for-in loops
+ if (p.lexer.token == .t_in) {
+ try p.forbidInitializers(decls, "in", false);
+ p.lexer.next();
+ const value = p.parseExpr(.comma);
+ p.lexer.expect(.t_close_paren);
+ var stmtOpts = ParseStatementOptions{};
+ const body = p.parseStmt(&stmtOpts) catch unreachable;
+ return p.s(S.ForIn{ .init = init_ orelse unreachable, .value = value, .body = body }, loc);
+ }
+
+ // Only require "const" statement initializers when we know we're a normal for loop
+ if (init_) |init_stmt| {
+ switch (init_stmt.data) {
+ .s_local => |local| {
+ if (local.kind == .k_const) {
+ try p.requireInitializers(decls);
+ }
+ },
+ else => {},
+ }
+ }
+
+ p.lexer.expect(.t_semicolon);
+ if (p.lexer.token != .t_semicolon) {
+ test_ = p.parseExpr(.lowest);
+ }
+
+ p.lexer.expect(.t_semicolon);
+
+ if (p.lexer.token != .t_close_paren) {
+ update = p.parseExpr(.lowest);
+ }
+
+ p.lexer.expect(.t_close_paren);
+ var stmtOpts = ParseStatementOptions{};
+ const body = p.parseStmt(&stmtOpts) catch unreachable;
+ return p.s(
+ S.For{ .init = init_, .test_ = test_, .update = update, .body = body },
+ loc,
+ );
+ },
+ .t_import => {
+ const previous_import_keyword = p.es6_import_keyword;
+ p.es6_import_keyword = p.lexer.range();
+ p.lexer.next();
+ var stmt: S.Import = S.Import{
+ .namespace_ref = undefined,
+ .import_record_index = std.math.maxInt(u32),
+ };
+ var was_originally_bare_import = false;
+
+ // "export import foo = bar"
+ if ((opts.is_export or (opts.is_namespace_scope and !opts.is_typescript_declare)) and p.lexer.token != .t_identifier) {
+ p.lexer.expected(.t_identifier);
+ }
+
+ switch (p.lexer.token) {
+ // "import('path')"
+ // "import.meta"
+ .t_open_paren, .t_dot => {
+ p.es6_import_keyword = previous_import_keyword; // this wasn't an esm import statement after all
+ const expr = p.parseSuffix(p.parseImportExpr(loc, .lowest), .lowest, null, Expr.EFlags.none);
+ p.lexer.expectOrInsertSemicolon();
+ return p.s(S.SExpr{
+ .value = expr,
+ }, loc);
+ },
+ .t_string_literal, .t_no_substitution_template_literal => {
+ // "import 'path'"
+ if (!opts.is_module_scope and (!opts.is_namespace_scope or !opts.is_typescript_declare)) {
+ p.lexer.unexpected();
+ fail();
+ }
+ was_originally_bare_import = true;
+ },
+ .t_asterisk => {
+ // "import * as ns from 'path'"
+ if (!opts.is_module_scope and (!opts.is_namespace_scope or !opts.is_typescript_declare)) {
+ p.lexer.unexpected();
+ fail();
+ }
+
+ p.lexer.next();
+ p.lexer.expectContextualKeyword("as");
+ stmt = S.Import{
+ .namespace_ref = try p.storeNameInRef(p.lexer.identifier),
+ .star_name_loc = p.lexer.loc(),
+ .import_record_index = std.math.maxInt(u32),
+ };
+ p.lexer.expect(.t_identifier);
+ p.lexer.expectContextualKeyword("from");
+ },
+ .t_open_brace => {
+ // "import {item1, item2} from 'path'"
+ if (!opts.is_module_scope and (!opts.is_namespace_scope or !opts.is_typescript_declare)) {
+ p.lexer.unexpected();
+ fail();
+ }
+ var importClause = try p.parseImportClause();
+ stmt = S.Import{
+ .namespace_ref = undefined,
+ .import_record_index = std.math.maxInt(u32),
+ .items = importClause.items,
+ .is_single_line = importClause.is_single_line,
+ };
+ p.lexer.expectContextualKeyword("from");
+ },
+ .t_identifier => {
+ // "import defaultItem from 'path'"
+ // "import foo = bar"
+ if (!opts.is_module_scope and (!opts.is_namespace_scope)) {
+ p.lexer.unexpected();
+ fail();
+ }
+
+ const default_name = p.lexer.identifier;
+ stmt = S.Import{ .namespace_ref = undefined, .import_record_index = std.math.maxInt(u32), .default_name = LocRef{
+ .loc = p.lexer.loc(),
+ .ref = try p.storeNameInRef(default_name),
+ } };
+ p.lexer.next();
+
+ if (p.options.ts) {
+ // Skip over type-only imports
+ if (strings.eql(default_name, "type")) {
+ switch (p.lexer.token) {
+ .t_identifier => {
+ if (!strings.eql(p.lexer.identifier, "from")) {
+ // "import type foo from 'bar';"
+ p.lexer.next();
+ p.lexer.expectContextualKeyword("from");
+ _ = p.parsePath();
+ p.lexer.expectOrInsertSemicolon();
+ return p.s(S.TypeScript{}, loc);
+ }
+ },
+ .t_asterisk => {
+ // "import type * as foo from 'bar';"
+ p.lexer.next();
+ p.lexer.expectContextualKeyword("as");
+ p.lexer.expect(.t_identifier);
+ p.lexer.expectContextualKeyword("from");
+ _ = p.parsePath();
+ p.lexer.expectOrInsertSemicolon();
+ return p.s(S.TypeScript{}, loc);
+ },
+
+ .t_open_brace => {
+ // "import type {foo} from 'bar';"
+ _ = try p.parseImportClause();
+ p.lexer.expectContextualKeyword("from");
+ _ = p.parsePath();
+ p.lexer.expectOrInsertSemicolon();
+ return p.s(S.TypeScript{}, loc);
+ },
+ else => {},
+ }
+ }
+
+ // Parse TypeScript import assignment statements
+ p.es6_import_keyword = previous_import_keyword; // This wasn't an ESM import statement after all;
+ return p.parseTypeScriptImportEqualsStmt(loc, opts, logger.Loc.Empty, default_name);
+ }
+
+ if (p.lexer.token == .t_comma) {
+ p.lexer.next();
+
+ switch (p.lexer.token) {
+ // "import defaultItem, * as ns from 'path'"
+ .t_asterisk => {
+ p.lexer.next();
+ p.lexer.expectContextualKeyword("as");
+ stmt.namespace_ref = try p.storeNameInRef(p.lexer.identifier);
+ stmt.star_name_loc = p.lexer.loc();
+ p.lexer.expect(.t_identifier);
+ },
+ // "import defaultItem, {item1, item2} from 'path'"
+ .t_open_brace => {
+ const importClause = try p.parseImportClause();
+ stmt.items = importClause.items;
+ stmt.is_single_line = importClause.is_single_line;
+ },
+ else => {
+ p.lexer.unexpected();
+ },
+ }
+ }
+
+ p.lexer.expectContextualKeyword("from");
+ },
+ else => {
+ p.lexer.unexpected();
+ fail();
+ },
+ }
+
+ const path = p.parsePath();
+ stmt.import_record_index = p.addImportRecord(.stmt, path.loc, path.text);
+ p.import_records.items[stmt.import_record_index].was_originally_bare_import = was_originally_bare_import;
+ p.lexer.expectOrInsertSemicolon();
+
+ if (stmt.star_name_loc) |star| {
+ stmt.namespace_ref = try p.declareSymbol(.import, star, p.loadNameFromRef(stmt.namespace_ref));
+ } else {
+ var path_name = fs.PathName.init(strings.append(p.allocator, "import_", path.text) catch unreachable);
+ const name = try path_name.nonUniqueNameString(p.allocator);
+ stmt.namespace_ref = try p.newSymbol(.other, name);
+ var scope: *Scope = p.current_scope;
+ try scope.generated.append(stmt.namespace_ref);
+ }
+
+ var item_refs = std.StringHashMap(LocRef).init(p.allocator);
+
+ // Link the default item to the namespace
+ if (stmt.default_name) |*name_loc| {
+ const name = p.loadNameFromRef(name_loc.ref orelse unreachable);
+ const ref = try p.declareSymbol(.import, name_loc.loc, name);
+ try p.is_import_item.put(ref, true);
+ name_loc.ref = ref;
+ }
+
+ if (stmt.items.len > 0) {
+ try item_refs.ensureCapacity(@intCast(u32, stmt.items.len));
+ for (stmt.items) |*item| {
+ const name = p.loadNameFromRef(item.name.ref orelse unreachable);
+ const ref = try p.declareSymbol(.import, item.name.loc, name);
+ p.checkForNonBMPCodePoint(item.alias_loc, item.alias);
+ try p.is_import_item.put(ref, true);
+ item.name.ref = ref;
+ item_refs.putAssumeCapacity(item.alias, LocRef{ .loc = item.name.loc, .ref = ref });
+ }
+ }
+
+ // Track the items for this namespace
+ try p.import_items_for_namespace.put(stmt.namespace_ref, item_refs);
+ return p.s(stmt, loc);
+ },
+ .t_break => {
+ p.lexer.next();
+ const name = try p.parseLabelName();
+ p.lexer.expectOrInsertSemicolon();
+ return p.s(S.Break{ .label = name }, loc);
+ },
+ .t_continue => {
+ p.lexer.next();
+ const name = try p.parseLabelName();
+ p.lexer.expectOrInsertSemicolon();
+ return p.s(S.Continue{ .label = name }, loc);
+ },
+ .t_return => {
+ p.lexer.next();
+ var value: ?Expr = null;
+ if ((p.lexer.token != .t_semicolon and
+ !p.lexer.has_newline_before and
+ p.lexer.token != .t_close_brace and
+ p.lexer.token != .t_end_of_file))
+ {
+ value = p.parseExpr(.lowest);
+ }
+ p.latest_return_had_semicolon = p.lexer.token == .t_semicolon;
+ p.lexer.expectOrInsertSemicolon();
+
+ return p.s(S.Return{ .value = value }, loc);
+ },
+ .t_throw => {
+ p.lexer.next();
+ if (p.lexer.has_newline_before) {
+ try p.log.addError(p.source, logger.Loc{
+ .start = loc.start + 5,
+ }, "Unexpected newline after \"throw\"");
+ fail();
+ }
+ const expr = p.parseExpr(.lowest);
+ p.lexer.expectOrInsertSemicolon();
+ return p.s(S.Throw{ .value = expr }, loc);
+ },
+ .t_debugger => {
+ p.lexer.next();
+ p.lexer.expectOrInsertSemicolon();
+ return p.s(S.Debugger{}, loc);
+ },
+ .t_open_brace => {
+ _ = try p.pushScopeForParsePass(.block, loc);
+ defer p.popScope();
+ p.lexer.next();
+ var stmtOpts = ParseStatementOptions{};
+ const stmts = p.parseStmtsUpTo(.t_close_brace, &stmtOpts) catch unreachable;
+ p.lexer.next();
+ return p.s(S.Block{
+ .stmts = stmts,
+ }, loc);
+ },
+
+ else => {
+ const is_identifier = p.lexer.token == .t_identifier;
+ const name = p.lexer.identifier;
+ var emiss = E.Missing{};
+ // Parse either an async function, an async expression, or a normal expression
+ var expr: Expr = Expr{ .loc = loc, .data = Expr.Data{ .e_missing = &emiss } };
+ if (is_identifier and strings.eql(p.lexer.raw(), "async")) {
+ var async_range = p.lexer.range();
+ p.lexer.next();
+ if (p.lexer.token == .t_function and !p.lexer.has_newline_before) {
+ p.lexer.next();
+ return try p.parseFnStmt(async_range.loc, opts, async_range);
+ }
+
+ expr = p.parseSuffix(try p.parseAsyncPrefixExpr(async_range, .lowest), .lowest, null, Expr.EFlags.none);
+ } else {
+ const exprOrLet = try p.parseExprOrLetStmt(opts);
+ switch (exprOrLet.stmt_or_expr) {
+ .stmt => |stmt| {
+ p.lexer.expectOrInsertSemicolon();
+ return stmt;
+ },
+ .expr => |_expr| {
+ expr = _expr;
+ },
+ }
+ }
+
+ if (is_identifier) {
+ switch (expr.data) {
+ .e_identifier => |ident| {
+ if (p.lexer.token == .t_colon and opts.ts_decorators == null) {
+ _ = try p.pushScopeForParsePass(.label, loc);
+ defer p.popScope();
+
+ // Parse a labeled statement
+ p.lexer.next();
+
+ const _name = LocRef{ .loc = expr.loc, .ref = ident.ref };
+ var nestedOpts = ParseStatementOptions{};
+
+ switch (opts.lexical_decl) {
+ .allow_all, .allow_fn_inside_label => {
+ nestedOpts.lexical_decl = .allow_fn_inside_label;
+ },
+ else => {},
+ }
+ var stmt = p.parseStmt(&nestedOpts) catch unreachable;
+ return p.s(S.Label{ .name = _name, .stmt = stmt }, loc);
+ }
+ },
+ else => {},
+ }
+
+ if (p.options.ts) {
+ if (js_lexer.TypescriptStmtKeyword.List.get(name)) |ts_stmt| {
+ switch (ts_stmt) {
+ .ts_stmt_type => {
+ if (p.lexer.token == .t_identifier and !p.lexer.has_newline_before) {
+ // "type Foo = any"
+ var stmtOpts = ParseStatementOptions{ .is_module_scope = opts.is_module_scope };
+ p.skipTypescriptTypeStmt(&stmtOpts);
+ return p.s(S.TypeScript{}, loc);
+ }
+ },
+ .ts_stmt_namespace, .ts_stmt_module => {
+ // "namespace Foo {}"
+ // "module Foo {}"
+ // "declare module 'fs' {}"
+ // "declare module 'fs';"
+ if (((opts.is_module_scope or opts.is_namespace_scope) and (p.lexer.token == .t_identifier or
+ (p.lexer.token == .t_string_literal and opts.is_typescript_declare))))
+ {
+ return p.parseTypescriptNamespaceTmt(loc, opts);
+ }
+ },
+ .ts_stmt_interface => {
+ // "interface Foo {}"
+ var stmtOpts = ParseStatementOptions{ .is_module_scope = opts.is_module_scope };
+
+ p.skipTypeScriptInterfaceStmt(&stmtOpts);
+ return p.s(S.TypeScript{}, loc);
+ },
+ .ts_stmt_abstract => {
+ if (p.lexer.token == .t_class or opts.ts_decorators != null) {
+ return p.parseClassStmt(loc, opts);
+ }
+ },
+ .ts_stmt_global => {
+ // "declare module 'fs' { global { namespace NodeJS {} } }"
+ if (opts.is_namespace_scope and opts.is_typescript_declare and p.lexer.token == .t_open_brace) {
+ p.lexer.next();
+ _ = p.parseStmtsUpTo(.t_close_brace, opts) catch unreachable;
+ p.lexer.next();
+ return p.s(S.TypeScript{}, loc);
+ }
+ },
+ .ts_stmt_declare => {
+ opts.lexical_decl = .allow_all;
+ opts.is_typescript_declare = true;
+
+ // "@decorator declare class Foo {}"
+ // "@decorator declare abstract class Foo {}"
+ if (opts.ts_decorators != null and p.lexer.token != .t_class and !p.lexer.isContextualKeyword("abstract")) {
+ p.lexer.expected(.t_class);
+ }
+
+ // "declare global { ... }"
+ if (p.lexer.isContextualKeyword("global")) {
+ p.lexer.next();
+ p.lexer.expect(.t_open_brace);
+ _ = p.parseStmtsUpTo(.t_close_brace, opts) catch unreachable;
+ p.lexer.next();
+ return p.s(S.TypeScript{}, loc);
+ }
+
+ // "declare const x: any"
+ const stmt = p.parseStmt(opts) catch unreachable;
+ if (opts.ts_decorators) |decs| {
+ p.discardScopesUpTo(decs.scope_index);
+ }
+
+ // Unlike almost all uses of "declare", statements that use
+ // "export declare" with "var/let/const" inside a namespace affect
+ // code generation. They cause any declared bindings to be
+ // considered exports of the namespace. Identifier references to
+ // those names must be converted into property accesses off the
+ // namespace object:
+ //
+ // namespace ns {
+ // export declare const x
+ // export function y() { return x }
+ // }
+ //
+ // (ns as any).x = 1
+ // console.log(ns.y())
+ //
+ // In this example, "return x" must be replaced with "return ns.x".
+ // This is handled by replacing each "export declare" statement
+ // inside a namespace with an "export var" statement containing all
+ // of the declared bindings. That "export var" statement will later
+ // cause identifiers to be transformed into property accesses.
+ if (opts.is_namespace_scope and opts.is_export) {
+ var decls: []G.Decl = &([_]G.Decl{});
+ switch (stmt.data) {
+ .s_local => |local| {
+ var _decls = try List(G.Decl).initCapacity(p.allocator, local.decls.len);
+ for (local.decls) |decl| {
+ try extractDeclsForBinding(decl.binding, &_decls);
+ }
+ decls = _decls.toOwnedSlice();
+ },
+ else => {},
+ }
+
+ if (decls.len > 0) {
+ return p.s(S.Local{
+ .kind = .k_var,
+ .is_export = true,
+ .decls = decls,
+ }, loc);
+ }
+ }
+
+ return p.s(S.TypeScript{}, loc);
+ },
+ }
+ }
+ }
+ }
+
+ p.lexer.expectOrInsertSemicolon();
+ return p.s(S.SExpr{ .value = expr }, loc);
+ },
+ }
+
+ return js_ast.Stmt.empty();
+ }
+
+ pub fn discardScopesUpTo(p: *P, scope_index: usize) void {
+ // Remove any direct children from their parent
+ var scope = p.current_scope;
+ var children = scope.children;
+ for (p.scopes_in_order.items[scope_index..]) |child| {
+ if (child.scope.parent == p.current_scope) {
+ var i: usize = children.items.len - 1;
+ while (i >= 0) {
+ if (children.items[i] == child.scope) {
+ _ = children.orderedRemove(i);
+ break;
+ }
+ i -= 1;
+ }
+ }
+ }
+
+ // Truncate the scope order where we started to pretend we never saw this scope
+ p.scopes_in_order.shrinkAndFree(scope_index);
+ }
+
+ pub fn skipTypescriptTypeStmt(p: *P, opts: *ParseStatementOptions) void {
+ notimpl();
+ }
+
+ pub fn parseTypescriptNamespaceTmt(p: *P, loc: logger.Loc, opts: *ParseStatementOptions) Stmt {
+ notimpl();
+ }
+
+ pub fn skipTypeScriptInterfaceStmt(p: *P, opts: *ParseStatementOptions) void {
+ notimpl();
+ }
+
+ pub fn parseTypeScriptImportEqualsStmt(p: *P, loc: logger.Loc, opts: *ParseStatementOptions, default_name_loc: logger.Loc, default_name: string) Stmt {
+ notimpl();
+ }
+
+ pub fn parseClauseAlias(p: *P, kind: string) !string {
+ const loc = p.lexer.loc();
+
+ // The alias may now be a string (see https://github.com/tc39/ecma262/pull/2154)
+ if (p.lexer.token == .t_string_literal) {
+ if (p.lexer.utf16ToStringWithValidation(p.lexer.string_literal)) |alias| {
+ return alias;
+ } else |err| {
+ const r = p.source.rangeOfString(loc);
+ // TODO: improve error message
+ try p.log.addRangeErrorFmt(p.source, r, p.allocator, "Invalid {s} alias because it contains an unpaired Unicode surrogate (like emoji)", .{kind});
+ return p.source.textForRange(r);
+ }
+ }
+
+ // The alias may be a keyword
+ if (!p.lexer.isIdentifierOrKeyword()) {
+ p.lexer.expect(.t_identifier);
+ }
+
+ const alias = p.lexer.identifier;
+ p.checkForNonBMPCodePoint(loc, alias);
+ return alias;
+ }
+
+ pub fn parseImportClause(
+ p: *P,
+ ) !ImportClause {
+ var items = List(js_ast.ClauseItem).init(p.allocator);
+ p.lexer.expect(.t_open_brace);
+ var is_single_line = !p.lexer.has_newline_before;
+
+ while (p.lexer.token != .t_close_brace) {
+ // The alias may be a keyword;
+ const isIdentifier = p.lexer.token == .t_identifier;
+ const alias_loc = p.lexer.loc();
+ const alias = try p.parseClauseAlias("import");
+ var name = LocRef{ .loc = alias_loc, .ref = try p.storeNameInRef(alias) };
+ var original_name = alias;
+ p.lexer.next();
+
+ if (p.lexer.isContextualKeyword("as")) {
+ p.lexer.next();
+ original_name = p.lexer.identifier;
+ name = LocRef{ .loc = alias_loc, .ref = try p.storeNameInRef(alias) };
+ p.lexer.expect(.t_identifier);
+ } else if (!isIdentifier) {
+ // An import where the name is a keyword must have an alias
+ p.lexer.expectedString("\"as\"");
+ }
+
+ // Reject forbidden names
+ if (isEvalOrArguments(original_name)) {
+ const r = js_lexer.rangeOfIdentifier(&p.source, name.loc);
+ try p.log.addRangeErrorFmt(p.source, r, p.allocator, "Cannot use \"{s}\" as an identifier here", .{original_name});
+ }
+
+ try items.append(js_ast.ClauseItem{
+ .alias = alias,
+ .alias_loc = alias_loc,
+ .name = name,
+ .original_name = original_name,
+ });
+
+ if (p.lexer.token != .t_comma) {
+ break;
+ }
+
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+
+ p.lexer.next();
+
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+ }
+
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+
+ p.lexer.expect(.t_close_brace);
+ return ImportClause{ .items = items.toOwnedSlice(), .is_single_line = is_single_line };
+ }
+
+ pub fn forbidInitializers(p: *P, decls: []G.Decl, loop_type: string, is_var: bool) !void {
+ if (decls.len > 1) {
+ try p.log.addErrorFmt(p.source, decls[0].binding.loc, p.allocator, "for-{s} loops must have a single declaration", .{loop_type});
+ } else if (decls.len == 1) {
+ if (decls[0].value) |value| {
+ if (is_var) {
+
+ // This is a weird special case. Initializers are allowed in "var"
+ // statements with identifier bindings.
+ return;
+ }
+
+ try p.log.addErrorFmt(p.source, value.loc, p.allocator, "for-{s} loop variables cannot have an initializer", .{loop_type});
+ }
+ }
+ }
+
+ pub fn parseExprOrLetStmt(p: *P, opts: *ParseStatementOptions) !ExprOrLetStmt {
+ var let_range = p.lexer.range();
+ var raw = p.lexer.raw();
+
+ if (p.lexer.token != .t_identifier or !strings.eql(raw, "let")) {
+ return ExprOrLetStmt{ .stmt_or_expr = js_ast.StmtOrExpr{ .expr = p.parseExpr(.lowest) } };
+ }
+
+ p.lexer.next();
+
+ switch (p.lexer.token) {
+ .t_identifier, .t_open_bracket, .t_open_brace => {
+ if (opts.lexical_decl == .allow_all or !p.lexer.has_newline_before or p.lexer.token == .t_open_bracket) {
+ if (opts.lexical_decl != .allow_all) {
+ try p.forbidLexicalDecl(let_range.loc);
+ }
+
+ const decls = p.parseAndDeclareDecls(.other, opts);
+ return ExprOrLetStmt{
+ .stmt_or_expr = js_ast.StmtOrExpr{
+ .stmt = p.s(S.Local{
+ .kind = .k_let,
+ .decls = decls,
+ .is_export = opts.is_export,
+ }, let_range.loc),
+ },
+ .decls = decls,
+ };
+ }
+ },
+ else => {},
+ }
+
+ const ref = p.storeNameInRef(raw) catch unreachable;
+ const expr = p.e(E.Identifier{ .ref = ref }, let_range.loc);
+ return ExprOrLetStmt{ .stmt_or_expr = js_ast.StmtOrExpr{ .expr = p.parseExpr(.lowest) } };
+ }
+
+ pub fn requireInitializers(p: *P, decls: []G.Decl) !void {
+ for (decls) |decl| {
+ if (decl.value == null) {
+ switch (decl.binding.data) {
+ .b_identifier => |ident| {
+ const r = js_lexer.rangeOfIdentifier(&p.source, decl.binding.loc);
+ try p.log.addRangeErrorFmt(p.source, r, p.allocator, "The constant \"{s}\" must be initialized", .{p.symbols.items[ident.ref.inner_index].original_name});
+ // return;/
+ },
+ else => {
+ try p.log.addError(p.source, decl.binding.loc, "This constant must be initialized");
+ },
+ }
+ }
+ }
+ }
+
+ pub fn parseBinding(p: *P) Binding {
+ var loc = p.lexer.loc();
+
+ switch (p.lexer.token) {
+ .t_identifier => {
+ const name = p.lexer.identifier;
+ if ((p.fn_or_arrow_data_parse.allow_await != .allow_ident and strings.eql(name, "await")) or (p.fn_or_arrow_data_parse.allow_yield != .allow_ident and strings.eql(name, "yield"))) {
+ // TODO: add fmt to addRangeError
+ p.log.addRangeError(p.source, p.lexer.range(), "Cannot use \"yield\" or \"await\" here.") catch unreachable;
+ }
+
+ const ref = p.storeNameInRef(name) catch unreachable;
+ p.lexer.next();
+ return p.b(B.Identifier{ .ref = ref }, loc);
+ },
+ .t_open_bracket => {
+ p.lexer.next();
+ var is_single_line = !p.lexer.has_newline_before;
+ var items = List(js_ast.ArrayBinding).init(p.allocator);
+ var has_spread = false;
+
+ // "in" expressions are allowed
+ var old_allow_in = p.allow_in;
+ p.allow_in = true;
+ while (p.lexer.token != .t_close_bracket) {
+ if (p.lexer.token == .t_comma) {
+ items.append(js_ast.ArrayBinding{
+ .binding = p.b(
+ B.Missing{},
+ p.lexer.loc(),
+ ),
+ }) catch unreachable;
+ } else {
+ if (p.lexer.token == .t_dot_dot_dot) {
+ p.lexer.next();
+ has_spread = true;
+
+ // This was a bug in the ES2015 spec that was fixed in ES2016
+ if (p.lexer.token != .t_identifier) {
+ // p.markSyntaxFeature(compat.NestedRestBinding, p.lexer.Range())
+
+ }
+ }
+
+ const binding = p.parseBinding();
+
+ var default_value: ?Expr = null;
+ if (!has_spread and p.lexer.token == .t_equals) {
+ p.lexer.next();
+ default_value = p.parseExpr(.comma);
+ }
+
+ items.append(js_ast.ArrayBinding{ .binding = binding, .default_value = default_value }) catch unreachable;
+
+ // Commas after spread elements are not allowed
+ if (has_spread and p.lexer.token == .t_comma) {
+ p.log.addRangeError(p.source, p.lexer.range(), "Unexpected \",\" after rest pattern") catch unreachable;
+ fail();
+ }
+ }
+
+ if (p.lexer.token != .t_comma) {
+ break;
+ }
+
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+ p.lexer.next();
+
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+ }
+ p.allow_in = old_allow_in;
+
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+ p.lexer.expect(.t_close_bracket);
+ return p.b(B.Array{
+ .items = items.toOwnedSlice(),
+ .has_spread = has_spread,
+ .is_single_line = is_single_line,
+ }, loc);
+ },
+ .t_open_brace => {
+ // p.markSyntaxFeature(compat.Destructuring, p.lexer.Range())
+ p.lexer.next();
+ var is_single_line = false;
+ var properties = List(js_ast.B.Property).init(p.allocator);
+
+ // "in" expressions are allowed
+ var old_allow_in = p.allow_in;
+ p.allow_in = true;
+
+ while (p.lexer.token != .t_close_brace) {
+ var property = p.parsePropertyBinding();
+ properties.append(property) catch unreachable;
+
+ // Commas after spread elements are not allowed
+ if (property.flags.is_spread and p.lexer.token == .t_comma) {
+ p.log.addRangeError(p.source, p.lexer.range(), "Unexpected \",\" after rest pattern") catch unreachable;
+ fail();
+ }
+
+ if (p.lexer.token != .t_comma) {
+ break;
+ }
+
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+ p.lexer.next();
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+ }
+
+ p.allow_in = old_allow_in;
+
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+ p.lexer.expect(.t_close_brace);
+
+ return p.b(B.Object{
+ .properties = properties.toOwnedSlice(),
+ .is_single_line = is_single_line,
+ }, loc);
+ },
+ else => {},
+ }
+
+ p.lexer.expect(.t_identifier);
+ return p.b(B.Missing{}, loc);
+ }
+
+ pub fn parsePropertyBinding(p: *P) B.Property {
+ var key: js_ast.Expr = undefined;
+ var is_computed = false;
+
+ switch (p.lexer.token) {
+ .t_dot_dot_dot => {
+ p.lexer.next();
+ const value = p.b(B.Identifier{
+ .ref = p.storeNameInRef(p.lexer.identifier) catch unreachable,
+ }, p.lexer.loc());
+ p.lexer.expect(.t_identifier);
+ return B.Property{
+ // This "key" diverges from esbuild, but is due to Go always having a zero value.
+ .key = p.e(E.Missing{}, logger.Loc.Empty),
+
+ .flags = Flags.Property{ .is_spread = true },
+ .value = value,
+ };
+ },
+ .t_numeric_literal => {
+ key = p.e(E.Number{
+ .value = p.lexer.number,
+ }, p.lexer.loc());
+ // check for legacy octal literal
+ p.lexer.next();
+ },
+ .t_string_literal => {
+ key = p.parseStringLiteral();
+ },
+ .t_big_integer_literal => {
+ key = p.e(E.BigInt{
+ .value = p.lexer.identifier,
+ }, p.lexer.loc());
+ // p.markSyntaxFeature(compat.BigInt, p.lexer.Range())
+ p.lexer.next();
+ },
+ .t_open_bracket => {
+ is_computed = true;
+ p.lexer.next();
+ key = p.parseExpr(.comma);
+ p.lexer.expect(.t_close_bracket);
+ },
+ else => {
+ const name = p.lexer.identifier;
+ const loc = p.lexer.loc();
+
+ if (!p.lexer.isIdentifierOrKeyword()) {
+ p.lexer.expect(.t_identifier);
+ }
+
+ p.lexer.next();
+
+ key = p.e(E.String{
+ .value = p.lexer.stringToUTF16(name),
+ }, loc);
+
+ if (p.lexer.token != .t_colon and p.lexer.token != .t_open_paren) {
+ const ref = p.storeNameInRef(name) catch unreachable;
+ const value = p.b(B.Identifier{ .ref = ref }, loc);
+ var default_value: ?Expr = null;
+ if (p.lexer.token == .t_equals) {
+ p.lexer.next();
+ default_value = p.parseExpr(.comma);
+ }
+
+ return B.Property{
+ .key = key,
+ .value = value,
+ .default_value = default_value,
+ };
+ }
+ },
+ }
+
+ p.lexer.expect(.t_colon);
+ const value = p.parseBinding();
+
+ var default_value: ?Expr = null;
+ if (p.lexer.token == .t_equals) {
+ p.lexer.next();
+ default_value = p.parseExpr(.comma);
+ }
+
+ return B.Property{
+ .flags = Flags.Property{
+ .is_computed = is_computed,
+ },
+ .key = key,
+ .value = value,
+ .default_value = default_value,
+ };
+ }
+
+ pub fn parseAndDeclareDecls(p: *P, kind: Symbol.Kind, opts: *ParseStatementOptions) []G.Decl {
+ var decls = List(G.Decl).initCapacity(p.allocator, 1) catch unreachable;
+
+ while (true) {
+ // Forbid "let let" and "const let" but not "var let"
+ if ((kind == .other or kind == .cconst) and p.lexer.isContextualKeyword("let")) {
+ p.log.addRangeError(p.source, p.lexer.range(), "Cannot use \"let\" as an identifier here") catch unreachable;
+ }
+
+ var value: ?js_ast.Expr = null;
+ var local = p.parseBinding();
+ p.declareBinding(kind, local, opts) catch unreachable;
+
+ // Skip over types
+ if (p.options.ts) {
+ // "let foo!"
+ var is_definite_assignment_assertion = p.lexer.token == .t_exclamation;
+ if (is_definite_assignment_assertion) {
+ p.lexer.next();
+ }
+
+ // "let foo: number"
+ if (is_definite_assignment_assertion or p.lexer.token == .t_colon) {
+ p.lexer.expect(.t_colon);
+ p.skipTypescriptType(.lowest);
+ }
+ }
+
+ if (p.lexer.token == .t_equals) {
+ p.lexer.next();
+ value = p.parseExpr(.comma);
+ }
+
+ decls.append(G.Decl{
+ .binding = local,
+ .value = value,
+ }) catch unreachable;
+
+ if (p.lexer.token != .t_comma) {
+ break;
+ }
+ p.lexer.next();
+ }
+
+ return decls.toOwnedSlice();
+ }
+
+ pub fn parseTypescriptEnumStmt(p: *P, loc: logger.Loc, opts: *ParseStatementOptions) Stmt {
+ notimpl();
+ // return Stmt.empty();
+ }
+
+ pub fn parseExportClause(p: *P) !ExportClauseResult {
+ var items = List(js_ast.ClauseItem).initCapacity(p.allocator, 1) catch unreachable;
+ var first_keyword_item_loc = logger.Loc{};
+ p.lexer.expect(.t_open_brace);
+ var is_single_line = !p.lexer.has_newline_before;
+
+ while (p.lexer.token != .t_close_brace) {
+ var alias = try p.parseClauseAlias("export");
+ var alias_loc = p.lexer.loc();
+
+ var name = LocRef{
+ .loc = alias_loc,
+ .ref = p.storeNameInRef(alias) catch unreachable,
+ };
+ var original_name = alias;
+
+ // The name can actually be a keyword if we're really an "export from"
+ // statement. However, we won't know until later. Allow keywords as
+ // identifiers for now and throw an error later if there's no "from".
+ //
+ // // This is fine
+ // export { default } from 'path'
+ //
+ // // This is a syntax error
+ // export { default }
+ //
+ if (p.lexer.token != .t_identifier) {
+ if (!p.lexer.isIdentifierOrKeyword()) {
+ p.lexer.expect(.t_identifier);
+ }
+ if (first_keyword_item_loc.start == 0) {
+ first_keyword_item_loc = p.lexer.loc();
+ }
+ }
+
+ p.checkForNonBMPCodePoint(alias_loc, alias);
+ p.lexer.next();
+
+ if (p.lexer.isContextualKeyword("as")) {
+ p.lexer.next();
+ alias = try p.parseClauseAlias("export");
+ alias_loc = p.lexer.loc();
+
+ p.lexer.next();
+ }
+
+ items.append(js_ast.ClauseItem{
+ .alias = alias,
+ .alias_loc = alias_loc,
+ .name = name,
+ .original_name = original_name,
+ }) catch unreachable;
+
+ // we're done if there's no comma
+ if (p.lexer.token != .t_comma) {
+ break;
+ }
+
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+ p.lexer.next();
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+ }
+
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+ p.lexer.expect(.t_close_brace);
+
+ // Throw an error here if we found a keyword earlier and this isn't an
+ // "export from" statement after all
+ if (first_keyword_item_loc.start != 0 and !p.lexer.isContextualKeyword("from")) {
+ const r = js_lexer.rangeOfIdentifier(&p.source, first_keyword_item_loc);
+ p.lexer.addRangeError(r, "Expected identifier but found \"{s}\"", .{p.source.textForRange(r)}, true);
+ }
+
+ return ExportClauseResult{
+ .clauses = items.toOwnedSlice(),
+ .is_single_line = is_single_line,
+ };
+ }
+
+ pub fn parsePath(p: *P) ParsedPath {
+ var path = ParsedPath{
+ .loc = p.lexer.loc(),
+ .text = p.lexer.utf16ToString(p.lexer.string_literal),
+ };
+
+ if (p.lexer.token == .t_no_substitution_template_literal) {
+ p.lexer.next();
+ } else {
+ p.lexer.expect(.t_string_literal);
+ }
+
+ return path;
+ }
+
+ // TODO:
+ pub fn checkForNonBMPCodePoint(p: *P, loc: logger.Loc, name: string) void {}
+
+ pub fn parseStmtsUpTo(p: *P, eend: js_lexer.T, opts: *ParseStatementOptions) ![]Stmt {
+ var stmts = StmtList.init(p.allocator);
+
+ var returnWithoutSemicolonStart: i32 = -1;
+ opts.lexical_decl = .allow_all;
+ var isDirectivePrologue = true;
+
+ run: while (true) {
+ for (p.lexer.comments_to_preserve_before.items) |comment| {
+ try stmts.append(p.s(S.Comment{
+ .text = comment.text,
+ }, p.lexer.loc()));
+ }
+
+ if (p.lexer.token == eend) {
+ break;
+ }
+
+ var stmt = p.parseStmt(opts) catch break :run;
+
+ // Skip TypeScript types entirely
+ if (p.options.ts) {
+ switch (stmt.data) {
+ .s_type_script => {
+ continue;
+ },
+ else => {},
+ }
+ }
+
+ // Parse one or more directives at the beginning
+ if (isDirectivePrologue) {
+ isDirectivePrologue = false;
+ switch (stmt.data) {
+ .s_expr => |expr| {
+ switch (expr.value.data) {
+ .e_string => |str| {
+ if (!str.prefer_template) {
+ stmt.data = Stmt.Data{
+ .s_directive = p.m(S.Directive{
+ .value = str.value,
+ // .legacy_octal_loc = str.legacy_octal_loc,
+ }),
+ };
+ isDirectivePrologue = true;
+
+ if (strings.eqlUtf16("use strict", str.value)) {
+ // Track "use strict" directives
+ p.current_scope.strict_mode = .explicit_strict_mode;
+ } else if (strings.eqlUtf16("use asm", str.value)) {
+ stmt.data = Stmt.Data{ .s_empty = p.m(S.Empty{}) };
+ }
+ }
+ },
+ else => {},
+ }
+ },
+ else => {},
+ }
+ }
+
+ try stmts.append(stmt);
+
+ // Warn about ASI and return statements. Here's an example of code with
+ // this problem: https://github.com/rollup/rollup/issues/3729
+ if (!p.options.suppress_warnings_about_weird_code) {
+ var needsCheck = true;
+ switch (stmt.data) {
+ .s_return => |ret| {
+ if (ret.value == null and !p.latest_return_had_semicolon) {
+ returnWithoutSemicolonStart = stmt.loc.start;
+ needsCheck = false;
+ }
+ },
+ else => {},
+ }
+
+ if (needsCheck and returnWithoutSemicolonStart != -1) {
+ switch (stmt.data) {
+ .s_expr => |exp| {
+ try p.log.addWarning(
+ p.source,
+ logger.Loc{ .start = returnWithoutSemicolonStart + 6 },
+ "The following expression is not returned because of an automatically-inserted semicolon",
+ );
+ },
+ else => {},
+ }
+
+ returnWithoutSemicolonStart = -1;
+ }
+ }
+ }
+
+ return stmts.toOwnedSlice();
+ }
+
+ pub fn markStrictModeFeature(p: *P, feature: StrictModeFeature, r: logger.Range, detail: string) !void {
+ var text: string = undefined;
+ var can_be_transformed = false;
+ switch (feature) {
+ .with_statement => {
+ text = "With statements";
+ },
+ .delete_bare_name => {
+ text = "\"delete\" of a bare identifier";
+ },
+ .for_in_var_init => {
+ text = "Variable initializers within for-in loops";
+ can_be_transformed = true;
+ },
+ .eval_or_arguments => {
+ text = try std.fmt.allocPrint(p.allocator, "Declarations with the name {s}", .{detail});
+ },
+ .reserved_word => {
+ text = try std.fmt.allocPrint(p.allocator, "{s} is a reserved word and", .{detail});
+ },
+ .legacy_octal_literal => {
+ text = "Legacy octal literals";
+ },
+ .legacy_octal_escape => {
+ text = "Legacy octal escape sequences";
+ },
+ .if_else_function_stmt => {
+ text = "Function declarations inside if statements";
+ },
+ // else => {
+ // text = "This feature";
+ // },
+ }
+
+ var scope = p.current_scope;
+ if (p.isStrictMode()) {
+ var why: string = "";
+ var notes: []logger.Data = undefined;
+ var where: logger.Range = undefined;
+ switch (scope.strict_mode) {
+ .implicit_strict_mode_import => {
+ where = p.es6_import_keyword;
+ },
+ .implicit_strict_mode_export => {
+ where = p.es6_export_keyword;
+ },
+ .implicit_strict_mode_top_level_await => {
+ where = p.top_level_await_keyword;
+ },
+ .implicit_strict_mode_class => {
+ why = "All code inside a class is implicitly in strict mode";
+ where = p.enclosing_class_keyword;
+ },
+ else => {},
+ }
+ if (why.len == 0) {
+ why = try std.fmt.allocPrint(p.allocator, "This file is implicitly in strict mode because of the \"{s}\" keyword here", .{p.source.textForRange(where)});
+ }
+
+ try p.log.addRangeErrorWithNotes(p.source, r, try std.fmt.allocPrint(p.allocator, "{s} cannot be used in strict mode", .{text}), &([_]logger.Data{logger.rangeData(p.source, where, why)}));
+ } else if (!can_be_transformed and p.isStrictModeOutputFormat()) {
+ try p.log.addRangeError(p.source, r, try std.fmt.allocPrint(p.allocator, "{s} cannot be used with \"esm\" due to strict mode", .{text}));
+ }
+ }
+
+ pub fn isStrictMode(p: *P) bool {
+ return p.current_scope.strict_mode != .sloppy_mode;
+ }
+
+ pub fn isStrictModeOutputFormat(p: *P) bool {
+ return true;
+ }
+
+ pub fn declareSymbol(p: *P, kind: Symbol.Kind, loc: logger.Loc, name: string) !Ref {
+ // p.checkForNonBMPCodePoint(loc, name)
+
+ // Forbid declaring a symbol with a reserved word in strict mode
+ if (p.isStrictMode() and js_lexer.StrictModeReservedWords.has(name)) {
+ try p.markStrictModeFeature(.reserved_word, js_lexer.rangeOfIdentifier(&p.source, loc), name);
+ }
+
+ // Allocate a new symbol
+ var ref = try p.newSymbol(kind, name);
+
+ const scope = p.current_scope;
+ if (scope.members.get(name)) |existing| {
+ var symbol: Symbol = p.symbols.items[@intCast(usize, existing.ref.inner_index)];
+
+ switch (p.canMergeSymbols(scope, symbol.kind, kind)) {
+ .forbidden => {
+ const r = js_lexer.rangeOfIdentifier(&p.source, loc);
+ var notes: []logger.Data = undefined;
+ notes = &([_]logger.Data{logger.rangeData(p.source, r, try std.fmt.allocPrint(p.allocator, "{s} has already been declared", .{name}))});
+ try p.log.addRangeErrorWithNotes(p.source, r, try std.fmt.allocPrint(p.allocator, "{s} was originally declared here", .{name}), notes);
+ return existing.ref;
+ },
+ .keep_existing => {
+ ref = existing.ref;
+ },
+ .replace_with_new => {
+ symbol.link = ref;
+ },
+ .become_private_get_set_pair => {
+ ref = existing.ref;
+ symbol.kind = .private_get_set_pair;
+ },
+ .become_private_static_get_set_pair => {
+ ref = existing.ref;
+ symbol.kind = .private_static_get_set_pair;
+ },
+
+ .overwrite_with_new => {},
+ // else => unreachable,
+ }
+ }
+
+ try scope.members.put(name, js_ast.Scope.Member{ .ref = ref, .loc = loc });
+ return ref;
+ }
+
+ pub fn validateFunctionName(p: *P, func: G.Fn, kind: FunctionKind) void {
+ if (func.name) |name| {
+ const original_name = p.symbols.items[name.ref.?.inner_index].original_name;
+
+ if (func.flags.is_async and strings.eql(original_name, "await")) {
+ p.log.addRangeError(
+ p.source,
+ js_lexer.rangeOfIdentifier(&p.source, name.loc),
+ "An async function cannot be named \"await\"",
+ ) catch unreachable;
+ } else if (kind == .expr and func.flags.is_generator and strings.eql(original_name, "yield")) {
+ p.log.addRangeError(
+ p.source,
+ js_lexer.rangeOfIdentifier(&p.source, name.loc),
+ "An generator function expression cannot be named \"yield\"",
+ ) catch unreachable;
+ }
+ }
+ }
+
+ pub fn parseFnExpr(p: *P, loc: logger.Loc, is_async: bool, async_range: logger.Range) !Expr {
+ p.lexer.next();
+ const is_generator = p.lexer.token == T.t_asterisk;
+ if (is_generator) {
+ // p.markSyntaxFeature()
+ p.lexer.next();
+ } else if (is_async) {
+ // p.markLoweredSyntaxFeature(compat.AsyncAwait, asyncRange, compat.Generator)
+ }
+
+ var name: ?js_ast.LocRef = null;
+
+ _ = p.pushScopeForParsePass(.function_args, loc) catch unreachable;
+ defer p.popScope();
+
+ if (p.lexer.token == .t_identifier) {
+ name = js_ast.LocRef{
+ .loc = loc,
+ .ref = null,
+ };
+
+ if (p.lexer.identifier.len > 0 and !strings.eql(p.lexer.identifier, "arguments")) {
+ (name orelse unreachable).ref = try p.declareSymbol(.hoisted_function, (name orelse unreachable).loc, p.lexer.identifier);
+ } else {
+ (name orelse unreachable).ref = try p.newSymbol(.hoisted_function, p.lexer.identifier);
+ }
+ debug("FUNC NAME {s}", .{p.lexer.identifier});
+ p.lexer.next();
+ }
+
+ if (p.options.ts) {
+ p.skipTypescriptTypeParameters();
+ }
+
+ var func = p.parseFn(name, FnOrArrowDataParse{
+ .async_range = async_range,
+ .allow_await = if (is_async) .allow_expr else .allow_ident,
+ .allow_yield = if (is_generator) .allow_expr else .allow_ident,
+ });
+
+ p.validateFunctionName(func, .expr);
+
+ return p.e(js_ast.E.Function{
+ .func = func,
+ }, loc);
+ }
+
+ pub fn parseFnBody(p: *P, data: *FnOrArrowDataParse) !G.FnBody {
+ var oldFnOrArrowData = p.fn_or_arrow_data_parse;
+ var oldAllowIn = p.allow_in;
+ p.fn_or_arrow_data_parse = data.*;
+ p.allow_in = true;
+
+ const loc = p.lexer.loc();
+ _ = try p.pushScopeForParsePass(Scope.Kind.function_body, p.lexer.loc());
+ defer p.popScope();
+
+ p.lexer.expect(.t_open_brace);
+ var opts = ParseStatementOptions{};
+ const stmts = p.parseStmtsUpTo(.t_close_brace, &opts) catch unreachable;
+ p.lexer.next();
+
+ p.allow_in = oldAllowIn;
+ p.fn_or_arrow_data_parse = oldFnOrArrowData;
+ return G.FnBody{ .loc = loc, .stmts = stmts };
+ }
+
+ pub fn parseArrowBody(p: *P, args: []js_ast.G.Arg, data: *FnOrArrowDataParse) !E.Arrow {
+ var arrow_loc = p.lexer.loc();
+
+ // Newlines are not allowed before "=>"
+ if (p.lexer.has_newline_before) {
+ try p.log.addRangeError(p.source, p.lexer.range(), "Unexpected newline before \"=>\"");
+ fail();
+ }
+
+ p.lexer.expect(T.t_equals_greater_than);
+
+ for (args) |arg| {
+ var opts = ParseStatementOptions{};
+ try p.declareBinding(Symbol.Kind.hoisted, arg.binding, &opts);
+ }
+
+ data.allow_super_call = p.fn_or_arrow_data_parse.allow_super_call;
+ if (p.lexer.token == .t_open_brace) {
+ var body = try p.parseFnBody(data);
+ p.after_arrow_body_loc = p.lexer.loc();
+ return E.Arrow{ .args = args, .body = body };
+ }
+
+ _ = try p.pushScopeForParsePass(Scope.Kind.function_body, arrow_loc);
+ defer p.popScope();
+
+ var old_fn_or_arrow_data = p.fn_or_arrow_data_parse;
+ p.fn_or_arrow_data_parse = data.*;
+
+ var expr = p.parseExpr(Level.comma);
+ p.fn_or_arrow_data_parse = old_fn_or_arrow_data;
+ var stmts = try p.allocator.alloc(Stmt, 1);
+ stmts[0] = p.s(S.Return{ .value = expr }, arrow_loc);
+
+ return E.Arrow{ .args = args, .prefer_expr = true, .body = G.FnBody{ .loc = arrow_loc, .stmts = stmts } };
+ }
+
+ pub fn declareBinding(p: *P, kind: Symbol.Kind, binding: BindingNodeIndex, opts: *ParseStatementOptions) !void {
+ switch (binding.data) {
+ .b_missing => {},
+ .b_identifier => |bind| {
+ if (!opts.is_typescript_declare or (opts.is_namespace_scope and opts.is_export)) {
+ bind.ref = try p.declareSymbol(kind, binding.loc, p.loadNameFromRef(bind.ref));
+ }
+ },
+
+ .b_array => |bind| {
+ for (bind.items) |item| {
+ p.declareBinding(kind, item.binding, opts) catch unreachable;
+ }
+ },
+
+ .b_object => |bind| {
+ for (bind.properties) |*prop| {
+ const value = prop.value;
+ p.declareBinding(kind, value, opts) catch unreachable;
+ }
+ },
+
+ else => {
+ // @compileError("Missing binding type");
+ },
+ }
+ }
+
+ // Saves us from allocating a slice to the heap
+ pub fn parseArrowBodySingleArg(p: *P, arg: G.Arg, data: anytype) !E.Arrow {
+ switch (@TypeOf(data)) {
+ FnOrArrowDataParse => {
+ var args = [_]G.Arg{arg};
+
+ var d = data;
+
+ return p.parseArrowBody(args[0..], &d);
+ },
+ *FnOrArrowDataParse => {
+ var args = [_]G.Arg{arg};
+ return p.parseArrowBody(args[0..], data);
+ },
+ else => unreachable,
+ }
+ }
+
+ // This is where the allocate memory to the heap for AST objects.
+ // This is a short name to keep the code more readable.
+ // It also swallows errors, but I think that's correct here.
+ // We can handle errors via the log.
+ // We'll have to deal with @wasmHeapGrow or whatever that thing is.
+ pub fn mm(self: *P, comptime ast_object_type: type, instance: anytype) callconv(.Inline) *ast_object_type {
+ var obj = self.allocator.create(ast_object_type) catch unreachable;
+ obj.* = instance;
+ return obj;
+ }
+
+ // mmmm memmory allocation
+ pub fn m(self: *P, kind: anytype) callconv(.Inline) *@TypeOf(kind) {
+ return self.mm(@TypeOf(kind), kind);
+ }
+
+ // Doing this the fast way is too complicated for now.
+ pub fn storeNameInRef(p: *P, name: string) !js_ast.Ref {
+ // allocated_names is lazily allocated
+ if (p.allocated_names.capacity > 0) {
+ const inner_index = @intCast(Ref.Int, p.allocated_names.items.len);
+ try p.allocated_names.append(name);
+ return js_ast.Ref{ .source_index = std.math.maxInt(Ref.Int), .inner_index = inner_index };
+ } else {
+ p.allocated_names = try @TypeOf(p.allocated_names).initCapacity(p.allocator, 1);
+ p.allocated_names.appendAssumeCapacity(name);
+ return js_ast.Ref{ .source_index = std.math.maxInt(Ref.Int), .inner_index = 0 };
+ }
+ }
+
+ pub fn loadNameFromRef(p: *P, ref: js_ast.Ref) string {
+ assert(ref.inner_index < p.allocated_names.items.len);
+ return p.allocated_names.items[ref.inner_index];
+ }
+
+ // This parses an expression. This assumes we've already parsed the "async"
+ // keyword and are currently looking at the following token.
+ pub fn parseAsyncPrefixExpr(p: *P, async_range: logger.Range, level: Level) !Expr {
+ // "async function() {}"
+ if (!p.lexer.has_newline_before and p.lexer.token == T.t_function) {
+ return try p.parseFnExpr(async_range.loc, true, async_range);
+ }
+
+ // Check the precedence level to avoid parsing an arrow function in
+ // "new async () => {}". This also avoids parsing "new async()" as
+ // "new (async())()" instead.
+ if (!p.lexer.has_newline_before and level.lt(.member)) {
+ switch (p.lexer.token) {
+ // "async => {}"
+ .t_equals_greater_than => {
+ if (level.lte(.assign)) {
+ const arg = G.Arg{ .binding = p.b(
+ B.Identifier{
+ .ref = try p.storeNameInRef("async"),
+ },
+ async_range.loc,
+ ) };
+ _ = p.pushScopeForParsePass(.function_args, async_range.loc) catch unreachable;
+ defer p.popScope();
+ var arrow_body = try p.parseArrowBodySingleArg(arg, FnOrArrowDataParse{});
+ return p.e(arrow_body, async_range.loc);
+ }
+ },
+ // "async x => {}"
+ .t_identifier => {
+ if (level.lte(.assign)) {
+ // p.markLoweredSyntaxFeature();
+ const ref = try p.storeNameInRef(p.lexer.identifier);
+ var arg = G.Arg{ .binding = p.b(B.Identifier{
+ .ref = ref,
+ }, p.lexer.loc()) };
+ p.lexer.next();
+
+ _ = try p.pushScopeForParsePass(.function_args, async_range.loc);
+ defer p.popScope();
+
+ var arrowBody = try p.parseArrowBodySingleArg(arg, FnOrArrowDataParse{
+ .allow_await = .allow_expr,
+ });
+ arrowBody.is_async = true;
+ return p.e(arrowBody, async_range.loc);
+ }
+ },
+
+ // "async()"
+ // "async () => {}"
+ .t_open_paren => {
+ p.lexer.next();
+ return p.parseParenExpr(async_range.loc, ParenExprOpts{ .is_async = true, .async_range = async_range });
+ },
+
+ // "async<T>()"
+ // "async <T>() => {}"
+ .t_less_than => {
+ if (p.options.ts and p.trySkipTypeScriptTypeParametersThenOpenParenWithBacktracking()) {
+ p.lexer.next();
+ return p.parseParenExpr(async_range.loc, ParenExprOpts{ .is_async = true, .async_range = async_range });
+ }
+ },
+
+ else => {},
+ }
+ }
+
+ // "async"
+ // "async + 1"
+ return p.e(
+ E.Identifier{ .ref = try p.storeNameInRef("async") },
+ async_range.loc,
+ );
+ }
+
+ pub fn trySkipTypeScriptTypeParametersThenOpenParenWithBacktracking(self: *P) bool {
+ notimpl();
+ }
+
+ pub fn parseExprOrBindings(p: *P, level: Level, errors: ?*DeferredErrors) Expr {
+ return p.parseExprCommon(level, errors, Expr.EFlags.none);
+ }
+
+ pub fn parseExpr(p: *P, level: Level) Expr {
+ return p.parseExprCommon(level, null, Expr.EFlags.none);
+ }
+
+ pub fn parseExprWithFlags(p: *P, level: Level, flags: Expr.EFlags) Expr {
+ return p.parseExprCommon(level, null, flags);
+ }
+
+ pub fn parseExprCommon(p: *P, level: Level, errors: ?*DeferredErrors, flags: Expr.EFlags) Expr {
+ const had_pure_comment_before = p.lexer.has_pure_comment_before and !p.options.ignore_dce_annotations;
+ var expr = p.parsePrefix(level, errors, flags);
+
+ // There is no formal spec for "__PURE__" comments but from reverse-
+ // engineering, it looks like they apply to the next CallExpression or
+ // NewExpression. So in "/* @__PURE__ */ a().b() + c()" the comment applies
+ // to the expression "a().b()".
+
+ if (had_pure_comment_before and level.lt(.call)) {
+ expr = p.parseSuffix(expr, @intToEnum(Level, @enumToInt(Level.call) - 1), errors, flags);
+ switch (expr.data) {
+ .e_call => |ex| {
+ ex.can_be_unwrapped_if_unused = true;
+ },
+ .e_new => |ex| {
+ ex.can_be_unwrapped_if_unused = true;
+ },
+ else => {},
+ }
+ }
+
+ return p.parseSuffix(expr, level, errors, flags);
+ }
+
+ pub fn addImportRecord(p: *P, kind: ImportKind, loc: logger.Loc, name: string) u32 {
+ var index = p.import_records.items.len;
+ const record = ImportRecord{
+ .kind = kind,
+ .range = p.source.rangeOfString(loc),
+ .path = fs.Path.init(name),
+ };
+ p.import_records.append(record) catch unreachable;
+ return @intCast(u32, index);
+ }
+
+ pub fn popScope(p: *P) void {
+ const current_scope = p.current_scope;
+ // We cannot rename anything inside a scope containing a direct eval() call
+ if (current_scope.contains_direct_eval) {
+ var iter = current_scope.members.iterator();
+ while (iter.next()) |member| {
+
+ // Using direct eval when bundling is not a good idea in general because
+ // esbuild must assume that it can potentially reach anything in any of
+ // the containing scopes. We try to make it work but this isn't possible
+ // in some cases.
+ //
+ // For example, symbols imported using an ESM import are a live binding
+ // to the underlying symbol in another file. This is emulated during
+ // scope hoisting by erasing the ESM import and just referencing the
+ // underlying symbol in the flattened bundle directly. However, that
+ // symbol may have a different name which could break uses of direct
+ // eval:
+ //
+ // // Before bundling
+ // import { foo as bar } from './foo.js'
+ // console.log(eval('bar'))
+ //
+ // // After bundling
+ // let foo = 123 // The contents of "foo.js"
+ // console.log(eval('bar'))
+ //
+ // There really isn't any way to fix this. You can't just rename "foo" to
+ // "bar" in the example above because there may be a third bundled file
+ // that also contains direct eval and imports the same symbol with a
+ // different conflicting import alias. And there is no way to store a
+ // live binding to the underlying symbol in a variable with the import's
+ // name so that direct eval can access it:
+ //
+ // // After bundling
+ // let foo = 123 // The contents of "foo.js"
+ // const bar = /* cannot express a live binding to "foo" here */
+ // console.log(eval('bar'))
+ //
+ // Technically a "with" statement could potentially make this work (with
+ // a big hit to performance), but they are deprecated and are unavailable
+ // in strict mode. This is a non-starter since all ESM code is strict mode.
+ //
+ // So while we still try to obey the requirement that all symbol names are
+ // pinned when direct eval is present, we make an exception for top-level
+ // symbols in an ESM file when bundling is enabled. We make no guarantee
+ // that "eval" will be able to reach these symbols and we allow them to be
+ // renamed or removed by tree shaking.
+ // if (p.currentScope.parent == null and p.has_es_module_syntax) {
+ // continue;
+ // }
+
+ p.symbols.items[member.value.ref.inner_index].must_not_be_renamed = true;
+ }
+ }
+
+ p.current_scope = current_scope.parent orelse p.panic("Internal error: attempted to call popScope() on the topmost scope", .{});
+ }
+
+ pub fn markExprAsParenthesized(p: *P, expr: *Expr) void {
+ switch (expr.data) {
+ .e_array => |ex| {
+ ex.is_parenthesized = true;
+ },
+ .e_object => |ex| {
+ ex.is_parenthesized = true;
+ },
+ else => {
+ return;
+ },
+ }
+ }
+
+ pub fn parseYieldExpr(p: *P, loc: logger.Loc) Expr {
+ // Parse a yield-from expression, which yields from an iterator
+ const isStar = p.lexer.token == T.t_asterisk;
+
+ if (isStar) {
+ if (p.lexer.has_newline_before) {
+ p.lexer.unexpected();
+ }
+ p.lexer.next();
+ }
+
+ var value: ?ExprNodeIndex = null;
+ switch (p.lexer.token) {
+ .t_close_brace, .t_close_paren, .t_colon, .t_comma, .t_semicolon => {},
+ else => {
+ if (isStar or !p.lexer.has_newline_before) {
+ value = p.parseExpr(.yield);
+ }
+ },
+ }
+
+ return p.e(E.Yield{
+ .value = value,
+ .is_star = isStar,
+ }, loc);
+ }
+
+ pub fn parseProperty(p: *P, kind: Property.Kind, opts: *PropertyOpts, errors: ?*DeferredErrors) ?G.Property {
+ var key: Expr = undefined;
+ var key_range = p.lexer.range();
+ var is_computed = false;
+
+ switch (p.lexer.token) {
+ .t_numeric_literal => {
+ key = p.e(E.Number{
+ .value = p.lexer.number,
+ }, p.lexer.loc());
+ // p.checkForLegacyOctalLiteral()
+ p.lexer.next();
+ },
+ .t_string_literal => {
+ key = p.parseStringLiteral();
+ },
+ .t_big_integer_literal => {
+ key = p.e(E.BigInt{ .value = p.lexer.identifier }, p.lexer.loc());
+ // markSyntaxFeature
+ p.lexer.next();
+ },
+ .t_private_identifier => {
+ if (!opts.is_class or opts.ts_decorators.len > 0) {
+ p.lexer.expected(.t_identifier);
+ }
+
+ key = p.e(E.PrivateIdentifier{ .ref = p.storeNameInRef(p.lexer.identifier) catch unreachable }, p.lexer.loc());
+ p.lexer.next();
+ },
+ .t_open_bracket => {
+ is_computed = true;
+ // p.markSyntaxFeature(compat.objectExtensions, p.lexer.range())
+ p.lexer.next();
+ const wasIdentifier = p.lexer.token == .t_identifier;
+ const expr = p.parseExpr(.comma);
+
+ // Handle index signatures
+ if (p.options.ts and p.lexer.token == .t_colon and wasIdentifier and opts.is_class) {
+ switch (expr.data) {
+ .e_identifier => |ident| {
+ p.lexer.next();
+ p.skipTypescriptType(.lowest);
+ p.lexer.expect(.t_close_bracket);
+ p.lexer.expect(.t_colon);
+ p.skipTypescriptType(.lowest);
+ p.lexer.expectOrInsertSemicolon();
+
+ // Skip this property entirely
+ return null;
+ },
+ else => {},
+ }
+ }
+
+ p.lexer.expect(.t_close_bracket);
+ key = expr;
+ },
+ .t_asterisk => {
+ if (kind != .normal or opts.is_generator) {
+ p.lexer.unexpected();
+ }
+
+ p.lexer.next();
+ opts.is_generator = true;
+ return p.parseProperty(.normal, opts, errors);
+ },
+
+ else => {
+ const name = p.lexer.identifier;
+ const raw = p.lexer.raw();
+ const name_range = p.lexer.range();
+
+ if (!p.lexer.isIdentifierOrKeyword()) {
+ p.lexer.expect(.t_identifier);
+ }
+
+ p.lexer.next();
+
+ // Support contextual keywords
+ if (kind == .normal and !opts.is_generator) {
+ // Does the following token look like a key?
+ var couldBeModifierKeyword = p.lexer.isIdentifierOrKeyword();
+ if (!couldBeModifierKeyword) {
+ switch (p.lexer.token) {
+ .t_open_bracket, .t_numeric_literal, .t_string_literal, .t_asterisk, .t_private_identifier => {
+ couldBeModifierKeyword = true;
+ },
+ else => {},
+ }
+ }
+
+ // If so, check for a modifier keyword
+ if (couldBeModifierKeyword) {
+ // TODO: micro-optimization, use a smaller list for non-typescript files.
+ if (js_lexer.PropertyModifierKeyword.List.get(name)) |keyword| {
+ switch (keyword) {
+ .p_get => {
+ if (!opts.is_async and strings.eql(raw, name)) {
+ // p.markSyntaxFeautre(ObjectAccessors, name_range)
+ return p.parseProperty(.get, opts, null);
+ }
+ },
+
+ .p_set => {
+ if (!opts.is_async and strings.eql(raw, name)) {
+ // p.markSyntaxFeautre(ObjectAccessors, name_range)
+ return p.parseProperty(.set, opts, null);
+ }
+ },
+ .p_async => {
+ if (!opts.is_async and strings.eql(raw, name) and !p.lexer.has_newline_before) {
+ opts.is_async = true;
+ opts.async_range = name_range;
+
+ // p.markSyntaxFeautre(ObjectAccessors, name_range)
+ return p.parseProperty(kind, opts, null);
+ }
+ },
+ .p_static => {
+ if (!opts.is_static and !opts.is_async and opts.is_class and strings.eql(raw, name)) {
+ opts.is_static = true;
+ return p.parseProperty(kind, opts, null);
+ }
+ },
+ .p_private, .p_protected, .p_public, .p_readonly, .p_abstract, .p_declare, .p_override => {
+ // Skip over TypeScript keywords
+ if (opts.is_class and p.options.ts and strings.eql(raw, name)) {
+ return p.parseProperty(kind, opts, null);
+ }
+ },
+ }
+ }
+ }
+ }
+
+ key = p.e(E.String{
+ .value = p.lexer.stringToUTF16(name),
+ }, name_range.loc);
+
+ // Parse a shorthand property
+ if (!opts.is_class and kind == .normal and p.lexer.token != .t_colon and p.lexer.token != .t_open_paren and p.lexer.token != .t_less_than and !opts.is_generator and !js_lexer.Keywords.has(name)) {
+ if ((p.fn_or_arrow_data_parse.allow_await != .allow_ident and strings.eql(name, "await")) or (p.fn_or_arrow_data_parse.allow_yield != .allow_ident and strings.eql(name, "yield"))) {
+ // TODO: add fmt to addRangeError
+ p.log.addRangeError(p.source, name_range, "Cannot use \"yield\" or \"await\" here.") catch unreachable;
+ }
+
+ const ref = p.storeNameInRef(name) catch unreachable;
+ const value = p.e(E.Identifier{ .ref = ref }, key.loc);
+
+ // Destructuring patterns have an optional default value
+ var initializer: ?Expr = null;
+ if (errors != null and p.lexer.token == .t_equals) {
+ (errors orelse unreachable).invalid_expr_default_value = p.lexer.range();
+ p.lexer.next();
+ initializer = p.parseExpr(.comma);
+ }
+
+ return G.Property{
+ .kind = kind,
+ .key = key,
+ .value = value,
+ .initializer = initializer,
+ .flags = Flags.Property{ .was_shorthand = true },
+ };
+ }
+ },
+ }
+
+ if (p.options.ts) {
+ // "class X { foo?: number }"
+ // "class X { foo!: number }"
+ if (opts.is_class and (p.lexer.token == .t_question or p.lexer.token == .t_exclamation)) {
+ p.lexer.next();
+ }
+
+ // "class X { foo?<T>(): T }"
+ // "const x = { foo<T>(): T {} }"
+ p.skipTypescriptTypeParameters();
+ }
+
+ // Parse a class field with an optional initial value
+ if (opts.is_class and kind == .normal and !opts.is_async and !opts.is_generator and p.lexer.token != .t_open_paren) {
+ var initializer: ?Expr = null;
+
+ // Forbid the names "constructor" and "prototype" in some cases
+ if (!is_computed) {
+ switch (key.data) {
+ .e_string => |str| {
+ if (std.mem.eql(u16, str.value, std.unicode.utf8ToUtf16LeStringLiteral("constructor")) or (opts.is_static and std.mem.eql(u16, str.value, std.unicode.utf8ToUtf16LeStringLiteral("prototype")))) {
+ // TODO: fmt error message to include string value.
+ p.log.addRangeError(p.source, key_range, "Invalid field name") catch unreachable;
+ }
+ },
+ else => {},
+ }
+ }
+
+ // Skip over types
+ if (p.options.ts and p.lexer.token == .t_colon) {
+ p.lexer.next();
+ p.skipTypescriptType(.lowest);
+ }
+
+ if (p.lexer.token == .t_equals) {
+ p.lexer.next();
+ initializer = p.parseExpr(.comma);
+ }
+
+ // Special-case private identifiers
+ switch (key.data) {
+ .e_private_identifier => |private| {
+ const name = p.loadNameFromRef(private.ref);
+ if (strings.eql(name, "#constructor")) {
+ p.log.addRangeError(p.source, key_range, "Invalid field name \"#constructor\"") catch unreachable;
+ }
+
+ var declare: js_ast.Symbol.Kind = undefined;
+ if (opts.is_static) {
+ declare = .private_static_field;
+ } else {
+ declare = .private_field;
+ }
+ private.ref = p.declareSymbol(declare, key.loc, name) catch unreachable;
+ },
+ else => {},
+ }
+
+ p.lexer.expectOrInsertSemicolon();
+
+ return G.Property{
+ .ts_decorators = opts.ts_decorators,
+ .kind = kind,
+ .flags = Flags.Property{
+ .is_computed = is_computed,
+ .is_static = opts.is_static,
+ },
+ .key = key,
+ .initializer = initializer,
+ };
+ }
+
+ // Parse a method expression
+ if (p.lexer.token == .t_open_paren or kind != .normal or opts.is_class or opts.is_async or opts.is_generator) {
+ if (p.lexer.token == .t_open_paren and kind != .get and kind != .set) {
+ // markSyntaxFeature object extensions
+ }
+
+ const loc = p.lexer.loc();
+ const scope_index = p.pushScopeForParsePass(.function_args, loc) catch unreachable;
+ var is_constructor = false;
+
+ // Forbid the names "constructor" and "prototype" in some cases
+ if (opts.is_class and !is_computed) {
+ switch (key.data) {
+ .e_string => |str| {
+ if (!opts.is_static and strings.eqlUtf16("constructor", str.value)) {
+ if (kind == .get) {
+ p.log.addRangeError(p.source, key_range, "Class constructor cannot be a getter") catch unreachable;
+ } else if (kind == .set) {
+ p.log.addRangeError(p.source, key_range, "Class constructor cannot be a setter") catch unreachable;
+ } else if (opts.is_async) {
+ p.log.addRangeError(p.source, key_range, "Class constructor cannot be an async function") catch unreachable;
+ } else if (opts.is_generator) {
+ p.log.addRangeError(p.source, key_range, "Class constructor cannot be a generator function") catch unreachable;
+ } else {
+ is_constructor = true;
+ }
+ } else if (opts.is_static and strings.eqlUtf16("prototype", str.value)) {
+ p.log.addRangeError(p.source, key_range, "Invalid static method name \"prototype\"") catch unreachable;
+ }
+ },
+ else => {},
+ }
+ }
+
+ var func = p.parseFn(null, FnOrArrowDataParse{
+ .async_range = opts.async_range,
+ .allow_await = if (opts.is_async) AwaitOrYield.allow_expr else AwaitOrYield.allow_ident,
+ .allow_yield = if (opts.is_generator) AwaitOrYield.allow_expr else AwaitOrYield.allow_ident,
+ .allow_super_call = opts.class_has_extends and is_constructor,
+ .allow_ts_decorators = opts.allow_ts_decorators,
+ .is_constructor = is_constructor,
+
+ // Only allow omitting the body if we're parsing TypeScript class
+ .allow_missing_body_for_type_script = p.options.ts and opts.is_class,
+ });
+
+ // "class Foo { foo(): void; foo(): void {} }"
+ if (func.body == null) {
+ // Skip this property entirely
+ p.popAndDiscardScope(scope_index);
+ return null;
+ }
+
+ p.popScope();
+ func.flags.is_unique_formal_parameters = true;
+ const value = p.e(E.Function{ .func = func }, loc);
+
+ // Enforce argument rules for accessors
+ switch (kind) {
+ .get => {
+ if (func.args.len > 0) {
+ const r = js_lexer.rangeOfIdentifier(&p.source, func.args[0].binding.loc);
+ p.log.addRangeErrorFmt(p.source, r, p.allocator, "Getter {s} must have zero arguments", .{p.keyNameForError(key)}) catch unreachable;
+ }
+ },
+ .set => {
+ if (func.args.len != 1) {
+ var r = js_lexer.rangeOfIdentifier(&p.source, if (func.args.len > 0) func.args[0].binding.loc else loc);
+ if (func.args.len > 1) {
+ r = js_lexer.rangeOfIdentifier(&p.source, func.args[1].binding.loc);
+ }
+ p.log.addRangeErrorFmt(p.source, r, p.allocator, "Setter {s} must have exactly 1 argument (there are {d})", .{ p.keyNameForError(key), func.args.len }) catch unreachable;
+ }
+ },
+ else => {},
+ }
+
+ // Special-case private identifiers
+ switch (key.data) {
+ .e_private_identifier => |private| {
+ var declare: Symbol.Kind = undefined;
+ var suffix: string = undefined;
+ switch (kind) {
+ .get => {
+ if (opts.is_static) {
+ declare = .private_static_get;
+ } else {
+ declare = .private_get;
+ }
+ suffix = "_get";
+ },
+ .set => {
+ if (opts.is_static) {
+ declare = .private_static_set;
+ } else {
+ declare = .private_set;
+ }
+ suffix = "_set";
+ },
+ else => {
+ if (opts.is_static) {
+ declare = .private_static_method;
+ } else {
+ declare = .private_method;
+ }
+ suffix = "_fn";
+ },
+ }
+
+ const name = p.loadNameFromRef(private.ref);
+ if (strings.eql(name, "#constructor")) {
+ p.log.addRangeError(p.source, key_range, "Invalid method name \"#constructor\"") catch unreachable;
+ }
+ private.ref = p.declareSymbol(declare, key.loc, name) catch unreachable;
+ },
+ else => {},
+ }
+
+ return G.Property{
+ .ts_decorators = opts.ts_decorators,
+ .kind = kind,
+ .flags = Flags.Property{
+ .is_computed = is_computed,
+ .is_method = true,
+ .is_static = opts.is_static,
+ },
+ .key = key,
+ .value = value,
+ };
+ }
+
+ p.lexer.expect(.t_colon);
+
+ const value = p.parseExprOrBindings(.comma, errors);
+
+ return G.Property{
+ .ts_decorators = &[_]Expr{},
+ .kind = kind,
+ .flags = Flags.Property{
+ .is_computed = is_computed,
+ },
+ .key = key,
+ .value = value,
+ };
+ }
+
+ // By the time we call this, the identifier and type parameters have already
+ // been parsed. We need to start parsing from the "extends" clause.
+ pub fn parseClass(p: *P, class_keyword: logger.Range, name: ?js_ast.LocRef, class_opts: ParseClassOptions) G.Class {
+ var extends: ?Expr = null;
+
+ if (p.lexer.token == .t_extends) {
+ p.lexer.next();
+ extends = p.parseExpr(.new);
+
+ // TypeScript's type argument parser inside expressions backtracks if the
+ // first token after the end of the type parameter list is "{", so the
+ // parsed expression above will have backtracked if there are any type
+ // arguments. This means we have to re-parse for any type arguments here.
+ // This seems kind of wasteful to me but it's what the official compiler
+ // does and it probably doesn't have that high of a performance overhead
+ // because "extends" clauses aren't that frequent, so it should be ok.
+ if (p.options.ts) {
+ p.skipTypeScriptTypeArguments(false); // isInsideJSXElement
+ }
+ }
+
+ if (p.options.ts and p.lexer.isContextualKeyword("implements")) {
+ p.lexer.next();
+
+ while (true) {
+ p.skipTypescriptType(.lowest);
+ if (p.lexer.token != .t_comma) {
+ break;
+ }
+ p.lexer.next();
+ }
+ }
+
+ var body_loc = p.lexer.loc();
+ p.lexer.expect(T.t_open_brace);
+ var properties = List(G.Property).init(p.allocator);
+
+ // Allow "in" and private fields inside class bodies
+ const old_allow_in = p.allow_in;
+ const old_allow_private_identifiers = p.allow_private_identifiers;
+ p.allow_in = true;
+ p.allow_private_identifiers = true;
+
+ // A scope is needed for private identifiers
+ const scopeIndex = p.pushScopeForParsePass(.class_body, body_loc) catch unreachable;
+
+ var opts = PropertyOpts{ .is_class = true, .allow_ts_decorators = class_opts.allow_ts_decorators, .class_has_extends = extends != null };
+ while (p.lexer.token != T.t_close_brace) {
+ if (p.lexer.token == .t_semicolon) {
+ p.lexer.next();
+ continue;
+ }
+
+ opts = PropertyOpts{ .is_class = true, .allow_ts_decorators = class_opts.allow_ts_decorators, .class_has_extends = extends != null };
+
+ // Parse decorators for this property
+ const first_decorator_loc = p.lexer.loc();
+ if (opts.allow_ts_decorators) {
+ opts.ts_decorators = p.parseTypeScriptDecorators();
+ } else {
+ opts.ts_decorators = &[_]Expr{};
+ }
+
+ // This property may turn out to be a type in TypeScript, which should be ignored
+ if (p.parseProperty(.normal, &opts, null)) |property| {
+ properties.append(property) catch unreachable;
+
+ // Forbid decorators on class constructors
+ if (opts.ts_decorators.len > 0) {
+ switch ((property.key orelse p.panic("Internal error: Expected property {s} to have a key.", .{property})).data) {
+ .e_string => |str| {
+ if (strings.eqlUtf16("constructor", str.value)) {
+ p.log.addError(p.source, first_decorator_loc, "TypeScript does not allow decorators on class constructors") catch unreachable;
+ }
+ },
+ else => {},
+ }
+ }
+ }
+ }
+
+ if (class_opts.is_type_script_declare) {
+ p.popAndDiscardScope(scopeIndex);
+ } else {
+ p.popScope();
+ }
+
+ p.allow_in = old_allow_in;
+ p.allow_private_identifiers = old_allow_private_identifiers;
+
+ p.lexer.expect(.t_close_brace);
+
+ return G.Class{
+ .class_name = name,
+ .extends = extends,
+ .ts_decorators = class_opts.ts_decorators,
+ .class_keyword = class_keyword,
+ .body_loc = body_loc,
+ .properties = properties.toOwnedSlice(),
+ };
+ }
+
+ pub fn skipTypeScriptTypeArguments(p: *P, isInsideJSXElement: bool) void {
+ notimpl();
+ }
+
+ pub fn parseTemplateParts(p: *P, include_raw: bool) std.meta.Tuple(&[_]type{ []E.TemplatePart, logger.Loc }) {
+ var parts = List(E.TemplatePart).initCapacity(p.allocator, 1) catch unreachable;
+ // Allow "in" inside template literals
+ var oldAllowIn = p.allow_in;
+ p.allow_in = true;
+ var legacy_octal_loc = logger.Loc.Empty;
+
+ parseTemplatePart: while (true) {
+ p.lexer.next();
+ var value = p.parseExpr(.lowest);
+ var tail_loc = p.lexer.loc();
+ p.lexer.rescanCloseBraceAsTemplateToken();
+ var tail = p.lexer.string_literal;
+ var tail_raw: string = "";
+
+ if (include_raw) {
+ tail_raw = p.lexer.rawTemplateContents();
+ } else if (p.lexer.legacy_octal_loc.start > tail_loc.start) {
+ legacy_octal_loc = p.lexer.legacy_octal_loc;
+ }
+
+ parts.append(E.TemplatePart{
+ .value = value,
+ .tail_loc = tail_loc,
+ .tail = tail,
+ .tail_raw = tail_raw,
+ }) catch unreachable;
+
+ if (p.lexer.token == .t_template_tail) {
+ p.lexer.next();
+ break :parseTemplatePart;
+ }
+ std.debug.assert(p.lexer.token != .t_end_of_file);
+ }
+
+ p.allow_in = oldAllowIn;
+
+ return .{ .@"0" = parts.toOwnedSlice(), .@"1" = legacy_octal_loc };
+ }
+
+ // This assumes the caller has already checked for TStringLiteral or TNoSubstitutionTemplateLiteral
+ pub fn parseStringLiteral(p: *P) Expr {
+ var legacy_octal_loc: logger.Loc = logger.Loc.Empty;
+ var loc = p.lexer.loc();
+ if (p.lexer.legacy_octal_loc.start > loc.start) {
+ legacy_octal_loc = p.lexer.legacy_octal_loc;
+ }
+
+ const expr = p.e(E.String{
+ .value = p.lexer.string_literal,
+ .legacy_octal_loc = legacy_octal_loc,
+ .prefer_template = p.lexer.token == .t_no_substitution_template_literal,
+ }, loc);
+ p.lexer.next();
+ return expr;
+ }
+
+ pub fn parseCallArgs(p: *P) []Expr {
+ // Allow "in" inside call arguments
+ const old_allow_in = p.allow_in;
+ p.allow_in = true;
+
+ var args = List(Expr).init(p.allocator);
+ p.lexer.expect(.t_open_paren);
+
+ while (p.lexer.token != .t_close_paren) {
+ const loc = p.lexer.loc();
+ const is_spread = p.lexer.token == .t_dot_dot_dot;
+ if (is_spread) {
+ // p.mark_syntax_feature(compat.rest_argument, p.lexer.range());
+ p.lexer.next();
+ }
+ var arg = p.parseExpr(.comma);
+ if (is_spread) {
+ arg = p.e(E.Spread{ .value = arg }, loc);
+ }
+ args.append(arg) catch unreachable;
+ if (p.lexer.token != .t_comma) {
+ break;
+ }
+ p.lexer.next();
+ }
+
+ p.lexer.expect(.t_close_paren);
+ p.allow_in = old_allow_in;
+ return args.toOwnedSlice();
+ }
+
+ pub fn parseSuffix(p: *P, left: Expr, level: Level, errors: ?*DeferredErrors, flags: Expr.EFlags) Expr {
+ return _parseSuffix(p, left, level, errors orelse &DeferredErrors.None, flags);
+ }
+ pub fn _parseSuffix(p: *P, _left: Expr, level: Level, errors: *DeferredErrors, flags: Expr.EFlags) Expr {
+ var expr: Expr = undefined;
+ var left = _left;
+ var loc = p.lexer.loc();
+ var optional_chain: ?js_ast.OptionalChain = null;
+
+ while (true) {
+ if (p.lexer.loc().start == p.after_arrow_body_loc.start) {
+ while (true) {
+ switch (p.lexer.token) {
+ .t_comma => {
+ if (level.gte(.comma)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{
+ .op = .bin_comma,
+ .left = left,
+ .right = p.parseExpr(.comma),
+ }, left.loc);
+ },
+ else => {
+ return left;
+ },
+ }
+ }
+ }
+
+ // Stop now if this token is forbidden to follow a TypeScript "as" cast
+ if (p.lexer.loc().start == p.forbid_suffix_after_as_loc.start) {
+ return left;
+ }
+
+ // Reset the optional chain flag by default. That way we won't accidentally
+ // treat "c.d" as OptionalChainContinue in "a?.b + c.d".
+ var old_optional_chain = optional_chain;
+ optional_chain = null;
+
+ switch (p.lexer.token) {
+ .t_dot => {
+ p.lexer.next();
+ if (p.lexer.token == .t_private_identifier and p.allow_private_identifiers) {
+ // "a.#b"
+ // "a?.b.#c"
+ switch (left.data) {
+ .e_super => {
+ p.lexer.expected(.t_identifier);
+ },
+ else => {},
+ }
+
+ var name = p.lexer.identifier;
+ var name_loc = p.lexer.loc();
+ p.lexer.next();
+ const ref = p.storeNameInRef(name) catch unreachable;
+ left = p.e(E.Index{
+ .target = left,
+ .index = p.e(
+ E.PrivateIdentifier{
+ .ref = ref,
+ },
+ name_loc,
+ ),
+ .optional_chain = old_optional_chain,
+ }, left.loc);
+ } else {
+ // "a.b"
+ // "a?.b.c"
+ if (!p.lexer.isIdentifierOrKeyword()) {
+ p.lexer.expect(.t_identifier);
+ }
+
+ var name = p.lexer.identifier;
+ var name_loc = p.lexer.loc();
+ p.lexer.next();
+
+ left = p.e(E.Dot{ .target = left, .name = name, .name_loc = name_loc, .optional_chain = old_optional_chain }, left.loc);
+ }
+
+ optional_chain = old_optional_chain;
+ },
+ .t_question_dot => {
+ p.lexer.next();
+ var optional_start = js_ast.OptionalChain.start;
+
+ // TODO: Remove unnecessary optional chains
+ // if p.options.mangleSyntax {
+ // if isNullOrUndefined, _, ok := toNullOrUndefinedWithSideEffects(left.Data); ok and !isNullOrUndefined {
+ // optionalStart = js_ast.OptionalChainNone
+ // }
+ // }
+
+ switch (p.lexer.token) {
+ .t_open_bracket => {
+ // "a?.[b]"
+ p.lexer.next();
+
+ // allow "in" inside the brackets;
+ const old_allow_in = p.allow_in;
+ p.allow_in = true;
+
+ const index = p.parseExpr(.lowest);
+
+ p.allow_in = old_allow_in;
+
+ p.lexer.expect(.t_close_bracket);
+ left = p.e(
+ E.Index{ .target = left, .index = index, .optional_chain = optional_start },
+ left.loc,
+ );
+ },
+
+ .t_open_paren => {
+ // "a?.()"
+ if (level.gte(.call)) {
+ return left;
+ }
+
+ left = p.e(E.Call{
+ .target = left,
+ .args = p.parseCallArgs(),
+ .optional_chain = optional_start,
+ }, left.loc);
+ },
+ .t_less_than => {
+ // "a?.<T>()"
+ if (!p.options.ts) {
+ p.lexer.expected(.t_identifier);
+ }
+
+ p.skipTypeScriptTypeArguments(false);
+ if (p.lexer.token != .t_open_paren) {
+ p.lexer.expected(.t_open_paren);
+ }
+
+ if (level.gte(.call)) {
+ return left;
+ }
+
+ left = p.e(
+ E.Call{ .target = left, .args = p.parseCallArgs(), .optional_chain = optional_start },
+ left.loc,
+ );
+ },
+ else => {
+ if (p.lexer.token == .t_private_identifier and p.allow_private_identifiers) {
+ // "a?.#b"
+ const name = p.lexer.identifier;
+ const name_loc = p.lexer.loc();
+ p.lexer.next();
+ const ref = p.storeNameInRef(name) catch unreachable;
+ left = p.e(E.Index{
+ .target = left,
+ .index = p.e(
+ E.PrivateIdentifier{
+ .ref = ref,
+ },
+ name_loc,
+ ),
+ .optional_chain = optional_start,
+ }, left.loc);
+ } else {
+ // "a?.b"
+ if (!p.lexer.isIdentifierOrKeyword()) {
+ p.lexer.expect(.t_identifier);
+ }
+ const name = p.lexer.identifier;
+ const name_loc = p.lexer.loc();
+ p.lexer.next();
+
+ left = p.e(E.Dot{
+ .target = left,
+ .name = name,
+ .name_loc = name_loc,
+ .optional_chain = optional_start,
+ }, left.loc);
+ }
+ },
+ }
+
+ // Only continue if we have started
+ if (optional_start == .start) {
+ optional_start = .ccontinue;
+ }
+ },
+ .t_no_substitution_template_literal => {
+ if (old_optional_chain != null) {
+ p.log.addRangeError(p.source, p.lexer.range(), "Template literals cannot have an optional chain as a tag") catch unreachable;
+ }
+ // p.markSyntaxFeature(compat.TemplateLiteral, p.lexer.Range());
+ const head = p.lexer.string_literal;
+ const head_raw = p.lexer.rawTemplateContents();
+ p.lexer.next();
+ left = p.e(E.Template{
+ .tag = left,
+ .head = head,
+ .head_raw = head_raw,
+ .legacy_octal_loc = logger.Loc.Empty,
+ }, left.loc);
+ },
+ .t_template_head => {
+ if (old_optional_chain != null) {
+ p.log.addRangeError(p.source, p.lexer.range(), "Template literals cannot have an optional chain as a tag") catch unreachable;
+ }
+ // p.markSyntaxFeature(compat.TemplateLiteral, p.lexer.Range());
+ const head = p.lexer.string_literal;
+ const head_raw = p.lexer.rawTemplateContents();
+ const partsGroup = p.parseTemplateParts(true);
+ p.lexer.next();
+ const tag = left;
+ left = p.e(E.Template{ .tag = tag, .head = head, .head_raw = head_raw, .parts = partsGroup.@"0" }, left.loc);
+ },
+ .t_open_bracket => {
+ // When parsing a decorator, ignore EIndex expressions since they may be
+ // part of a computed property:
+ //
+ // class Foo {
+ // @foo ['computed']() {}
+ // }
+ //
+ // This matches the behavior of the TypeScript compiler.
+ if (flags != .ts_decorator) {
+ return left;
+ }
+
+ p.lexer.next();
+
+ // Allow "in" inside the brackets
+ const old_allow_in = p.allow_in;
+ p.allow_in = true;
+
+ const index = p.parseExpr(.lowest);
+
+ p.allow_in = old_allow_in;
+
+ p.lexer.expect(.t_close_bracket);
+
+ left = p.e(E.Index{
+ .target = left,
+ .index = index,
+ .optional_chain = old_optional_chain,
+ }, left.loc);
+ optional_chain = old_optional_chain;
+ },
+ .t_open_paren => {
+ if (level.gte(.call)) {
+ return left;
+ }
+
+ left = p.e(
+ E.Call{
+ .target = left,
+ .args = p.parseCallArgs(),
+ .optional_chain = old_optional_chain,
+ },
+ left.loc,
+ );
+ optional_chain = old_optional_chain;
+ },
+ .t_question => {
+ if (level.gte(.conditional)) {
+ return left;
+ }
+ p.lexer.next();
+
+ // Stop now if we're parsing one of these:
+ // "(a?) => {}"
+ // "(a?: b) => {}"
+ // "(a?, b?) => {}"
+ if (p.options.ts and left.loc.start == p.latest_arrow_arg_loc.start and (p.lexer.token == .t_colon or
+ p.lexer.token == .t_close_paren or p.lexer.token == .t_comma))
+ {
+ if (errors.isEmpty()) {
+ p.lexer.unexpected();
+ }
+ errors.invalid_expr_after_question = p.lexer.range();
+ return left;
+ }
+
+ // Allow "in" in between "?" and ":"
+ const old_allow_in = p.allow_in;
+ p.allow_in = true;
+
+ const yes = p.parseExpr(.comma);
+
+ p.allow_in = old_allow_in;
+ p.lexer.expect(.t_colon);
+ const no = p.parseExpr(.comma);
+
+ left = p.e(E.If{
+ .test_ = left,
+ .yes = yes,
+ .no = no,
+ }, left.loc);
+ },
+ .t_exclamation => {
+ // Skip over TypeScript non-null assertions
+ if (p.lexer.has_newline_before) {
+ return left;
+ }
+
+ if (!p.options.ts) {
+ p.lexer.unexpected();
+ }
+
+ if (level.gte(.postfix)) {
+ return left;
+ }
+
+ p.lexer.next();
+ optional_chain = old_optional_chain;
+ },
+ .t_minus_minus => {
+ if (p.lexer.has_newline_before or level.gte(.postfix)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Unary{ .op = .un_post_dec, .value = left }, left.loc);
+ },
+ .t_plus_plus => {
+ if (p.lexer.has_newline_before or level.gte(.postfix)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Unary{ .op = .un_post_inc, .value = left }, left.loc);
+ },
+ .t_comma => {
+ if (level.gte(.comma)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_comma, .left = left, .right = p.parseExpr(.comma) }, left.loc);
+ },
+ .t_plus => {
+ if (level.gte(.add)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_add, .left = left, .right = p.parseExpr(.add) }, left.loc);
+ },
+ .t_plus_equals => {
+ if (level.gte(.assign)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_add_assign, .left = left, .right = p.parseExpr(@intToEnum(Op.Level, @enumToInt(Op.Level.assign) - 1)) }, left.loc);
+ },
+ .t_minus => {
+ if (level.gte(.add)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_sub, .left = left, .right = p.parseExpr(.add) }, left.loc);
+ },
+ .t_minus_equals => {
+ if (level.gte(.assign)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_sub_assign, .left = left, .right = p.parseExpr(Op.Level.assign.sub(1)) }, left.loc);
+ },
+ .t_asterisk => {
+ if (level.gte(.multiply)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_mul, .left = left, .right = p.parseExpr(.multiply) }, left.loc);
+ },
+ .t_asterisk_asterisk => {
+ if (level.gte(.exponentiation)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_pow, .left = left, .right = p.parseExpr(Op.Level.exponentiation.sub(1)) }, left.loc);
+ },
+ .t_asterisk_asterisk_equals => {
+ if (level.gte(.assign)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_pow_assign, .left = left, .right = p.parseExpr(Op.Level.assign.sub(1)) }, left.loc);
+ },
+ .t_asterisk_equals => {
+ if (level.gte(.assign)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_mul_assign, .left = left, .right = p.parseExpr(Op.Level.assign.sub(1)) }, left.loc);
+ },
+ .t_percent => {
+ if (level.gte(.multiply)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_rem, .left = left, .right = p.parseExpr(Op.Level.multiply) }, left.loc);
+ },
+ .t_percent_equals => {
+ if (level.gte(.assign)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_rem_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
+ },
+ .t_slash => {
+ if (level.gte(.multiply)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_div, .left = left, .right = p.parseExpr(Level.multiply) }, left.loc);
+ },
+ .t_slash_equals => {
+ if (level.gte(.assign)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_div_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
+ },
+ .t_equals_equals => {
+ if (level.gte(.equals)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_loose_eq, .left = left, .right = p.parseExpr(Level.equals) }, left.loc);
+ },
+ .t_exclamation_equals => {
+ if (level.gte(.equals)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_loose_ne, .left = left, .right = p.parseExpr(Level.equals) }, left.loc);
+ },
+ .t_equals_equals_equals => {
+ if (level.gte(.equals)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_strict_eq, .left = left, .right = p.parseExpr(Level.equals) }, left.loc);
+ },
+ .t_exclamation_equals_equals => {
+ if (level.gte(.equals)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_strict_ne, .left = left, .right = p.parseExpr(Level.equals) }, left.loc);
+ },
+ .t_less_than => {
+ // TypeScript allows type arguments to be specified with angle brackets
+ // inside an expression. Unlike in other languages, this unfortunately
+ // appears to require backtracking to parse.
+ if (p.options.ts and p.trySkipTypeScriptTypeArgumentsWithBacktracking()) {
+ optional_chain = old_optional_chain;
+ continue;
+ }
+
+ if (level.gte(.compare)) {
+ return left;
+ }
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_lt, .left = left, .right = p.parseExpr(.compare) }, left.loc);
+ },
+ .t_less_than_equals => {
+ if (level.gte(.compare)) {
+ return left;
+ }
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_le, .left = left, .right = p.parseExpr(.compare) }, left.loc);
+ },
+ .t_greater_than => {
+ if (level.gte(.compare)) {
+ return left;
+ }
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_gt, .left = left, .right = p.parseExpr(.compare) }, left.loc);
+ },
+ .t_greater_than_equals => {
+ if (level.gte(.compare)) {
+ return left;
+ }
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_ge, .left = left, .right = p.parseExpr(.compare) }, left.loc);
+ },
+ .t_less_than_less_than => {
+ if (level.gte(.shift)) {
+ return left;
+ }
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_shl, .left = left, .right = p.parseExpr(.shift) }, left.loc);
+ },
+ .t_less_than_less_than_equals => {
+ if (level.gte(.assign)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_shl_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
+ },
+ .t_greater_than_greater_than => {
+ if (level.gte(.shift)) {
+ return left;
+ }
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_shr, .left = left, .right = p.parseExpr(.shift) }, left.loc);
+ },
+ .t_greater_than_greater_than_equals => {
+ if (level.gte(.assign)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_shl_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
+ },
+ .t_greater_than_greater_than_greater_than => {
+ if (level.gte(.shift)) {
+ return left;
+ }
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_u_shr, .left = left, .right = p.parseExpr(.shift) }, left.loc);
+ },
+ .t_greater_than_greater_than_greater_than_equals => {
+ if (level.gte(.assign)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_u_shr_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
+ },
+ .t_question_question => {
+ if (level.gte(.nullish_coalescing)) {
+ return left;
+ }
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_nullish_coalescing, .left = left, .right = p.parseExpr(.nullish_coalescing) }, left.loc);
+ },
+ .t_question_question_equals => {
+ if (level.gte(.assign)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_nullish_coalescing_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
+ },
+ .t_bar_bar => {
+ if (level.gte(.logical_or)) {
+ return left;
+ }
+
+ // Prevent "||" inside "??" from the right
+ if (level.eql(.nullish_coalescing)) {
+ p.lexer.unexpected();
+ }
+
+ p.lexer.next();
+ const right = p.parseExpr(.logical_or);
+ left = p.e(E.Binary{ .op = Op.Code.bin_logical_or, .left = left, .right = right }, left.loc);
+
+ if (level.lt(.nullish_coalescing)) {
+ left = p.parseSuffix(left, Level.nullish_coalescing.add(1), null, flags);
+
+ if (p.lexer.token == .t_question_question) {
+ p.lexer.unexpected();
+ }
+ }
+ },
+ .t_bar_bar_equals => {
+ if (level.gte(.assign)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_logical_or_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
+ },
+ .t_ampersand_ampersand => {
+ if (level.gte(.logical_and)) {
+ return left;
+ }
+
+ // Prevent "&&" inside "??" from the right
+ if (level.eql(.nullish_coalescing)) {
+ p.lexer.unexpected();
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_logical_and, .left = left, .right = p.parseExpr(.logical_and) }, left.loc);
+
+ // Prevent "&&" inside "??" from the left
+ if (level.lt(.nullish_coalescing)) {
+ left = p.parseSuffix(left, Level.nullish_coalescing.add(1), null, flags);
+
+ if (p.lexer.token == .t_question_question) {
+ p.lexer.unexpected();
+ }
+ }
+ },
+ .t_ampersand_ampersand_equals => {
+ if (level.gte(.assign)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_logical_and_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
+ },
+ .t_bar => {
+ if (level.gte(.bitwise_or)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_bitwise_or, .left = left, .right = p.parseExpr(.bitwise_or) }, left.loc);
+ },
+ .t_bar_equals => {
+ if (level.gte(.assign)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_bitwise_or_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
+ },
+ .t_ampersand => {
+ if (level.gte(.bitwise_and)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_bitwise_and, .left = left, .right = p.parseExpr(.bitwise_and) }, left.loc);
+ },
+ .t_ampersand_equals => {
+ if (level.gte(.assign)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_shl_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
+ },
+ .t_caret => {
+ if (level.gte(.bitwise_xor)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_bitwise_xor, .left = left, .right = p.parseExpr(.bitwise_xor) }, left.loc);
+ },
+ .t_caret_equals => {
+ if (level.gte(.assign)) {
+ return left;
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_bitwise_xor_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
+ },
+ .t_equals => {
+ if (level.gte(.assign)) {
+ return left;
+ }
+
+ p.lexer.next();
+
+ left = p.e(E.Binary{ .op = .bin_assign, .left = left, .right = p.parseExpr(Level.assign.sub(1)) }, left.loc);
+ },
+ .t_in => {
+ if (level.gte(.compare) or !p.allow_in) {
+ return left;
+ }
+
+ // Warn about "!a in b" instead of "!(a in b)"
+ switch (left.data) {
+ .e_unary => |unary| {
+ if (unary.op == .un_not) {
+ // TODO:
+ // p.log.addRangeWarning(source: ?Source, r: Range, text: string)
+ }
+ },
+ else => {},
+ }
+
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_in, .left = left, .right = p.parseExpr(.compare) }, left.loc);
+ },
+ .t_instanceof => {
+ if (level.gte(.compare)) {
+ return left;
+ }
+
+ // Warn about "!a instanceof b" instead of "!(a instanceof b)". Here's an
+ // example of code with this problem: https://github.com/mrdoob/three.js/pull/11182.
+ if (!p.options.suppress_warnings_about_weird_code) {
+ switch (left.data) {
+ .e_unary => |unary| {
+ if (unary.op == .un_not) {
+ // TODO:
+ // p.log.addRangeWarning(source: ?Source, r: Range, text: string)
+ }
+ },
+ else => {},
+ }
+ }
+ p.lexer.next();
+ left = p.e(E.Binary{ .op = .bin_instanceof, .left = left, .right = p.parseExpr(.compare) }, left.loc);
+ },
+ else => {
+ // Handle the TypeScript "as" operator
+ if (p.options.ts and level.lt(.compare) and !p.lexer.has_newline_before and p.lexer.isContextualKeyword("as")) {
+ p.lexer.next();
+ p.skipTypescriptType(.lowest);
+
+ // These tokens are not allowed to follow a cast expression. This isn't
+ // an outright error because it may be on a new line, in which case it's
+ // the start of a new expression when it's after a cast:
+ //
+ // x = y as z
+ // (something);
+ //
+ switch (p.lexer.token) {
+ .t_plus_plus,
+ .t_minus_minus,
+ .t_no_substitution_template_literal,
+ .t_template_head,
+ .t_open_paren,
+ .t_open_bracket,
+ .t_question_dot,
+ => {
+ p.forbid_suffix_after_as_loc = p.lexer.loc();
+ return left;
+ },
+ else => {},
+ }
+
+ if (p.lexer.token.isAssign()) {
+ p.forbid_suffix_after_as_loc = p.lexer.loc();
+ return left;
+ }
+ continue;
+ }
+
+ return left;
+ },
+ }
+ }
+ }
+
+ pub fn panic(p: *P, comptime str: string, args: anytype) noreturn {
+ p.log.addRangeErrorFmt(p.source, p.lexer.range(), p.allocator, str, args) catch unreachable;
+
+ var fixedBuffer = [_]u8{0} ** 4096;
+ var stream = std.io.fixedBufferStream(&fixedBuffer);
+
+ p.log.print(stream.writer()) catch unreachable;
+ std.debug.panic("{s}", .{fixedBuffer});
+ }
+
+ pub fn _parsePrefix(p: *P, level: Level, errors: *DeferredErrors, flags: Expr.EFlags) Expr {
+ const loc = p.lexer.loc();
+ const l = @enumToInt(level);
+ std.debug.print("Parse Prefix {s}:{s} @{s} ", .{ p.lexer.token, p.lexer.raw(), @tagName(level) });
+
+ switch (p.lexer.token) {
+ .t_super => {
+ const superRange = p.lexer.range();
+ p.lexer.next();
+
+ switch (p.lexer.token) {
+ .t_open_paren => {
+ if (l < @enumToInt(Level.call) and p.fn_or_arrow_data_parse.allow_super_call) {
+ return p.e(E.Super{}, loc);
+ }
+ },
+ .t_dot, .t_open_bracket => {
+ return p.e(E.Super{}, loc);
+ },
+ else => {},
+ }
+
+ p.log.addRangeError(p.source, superRange, "Unexpected \"super\"") catch unreachable;
+ return p.e(E.Super{}, loc);
+ },
+ .t_open_paren => {
+ p.lexer.next();
+
+ // Arrow functions aren't allowed in the middle of expressions
+ if (level.gt(.assign)) {
+ const oldAllowIn = p.allow_in;
+ p.allow_in = true;
+
+ var value = p.parseExpr(Level.lowest);
+ p.markExprAsParenthesized(&value);
+ p.lexer.expect(.t_close_paren);
+ p.allow_in = oldAllowIn;
+ return value;
+ }
+
+ return p.parseParenExpr(loc, ParenExprOpts{}) catch unreachable;
+ },
+ .t_false => {
+ p.lexer.next();
+ return p.e(E.Boolean{ .value = false }, loc);
+ },
+ .t_true => {
+ p.lexer.next();
+ return p.e(E.Boolean{ .value = true }, loc);
+ },
+ .t_null => {
+ p.lexer.next();
+ return p.e(E.Null{}, loc);
+ },
+ .t_this => {
+ p.lexer.next();
+ return p.e(E.This{}, loc);
+ },
+ .t_identifier => {
+ const name = p.lexer.identifier;
+ const name_range = p.lexer.range();
+ const raw = p.lexer.raw();
+ p.lexer.next();
+
+ // Handle async and await expressions
+ switch (AsyncPrefixExpression.find(name)) {
+ .is_async => {
+ if (AsyncPrefixExpression.find(raw) != .is_async) {
+ return p.parseAsyncPrefixExpr(name_range, level) catch unreachable;
+ }
+ },
+
+ .is_await => {
+ switch (p.fn_or_arrow_data_parse.allow_await) {
+ .forbid_all => {
+ p.log.addRangeError(p.source, name_range, "The keyword \"await\" cannot be used here.") catch unreachable;
+ },
+ .allow_expr => {
+ if (AsyncPrefixExpression.find(raw) != .is_await) {
+ p.log.addRangeError(p.source, name_range, "The keyword \"await\" cannot be escaped.") catch unreachable;
+ } else {
+ if (p.fn_or_arrow_data_parse.is_top_level) {
+ p.top_level_await_keyword = name_range;
+ }
+
+ if (p.fn_or_arrow_data_parse.arrow_arg_errors) |*args| {
+ args.invalid_expr_await = name_range;
+ }
+
+ const value = p.parseExpr(.prefix);
+ if (p.lexer.token == T.t_asterisk_asterisk) {
+ p.lexer.unexpected();
+ }
+
+ return p.e(E.Await{ .value = value }, loc);
+ }
+ },
+ .allow_ident => {},
+ }
+ },
+
+ .is_yield => {
+ switch (p.fn_or_arrow_data_parse.allow_yield) {
+ .forbid_all => {
+ p.log.addRangeError(p.source, name_range, "The keyword \"yield\" cannot be used here") catch unreachable;
+ },
+ .allow_expr => {
+ if (AsyncPrefixExpression.find(raw) != .is_yield) {
+ p.log.addRangeError(p.source, name_range, "The keyword \"yield\" cannot be escaped") catch unreachable;
+ } else {
+ if (level.gte(.assign)) {
+ p.log.addRangeError(p.source, name_range, "Cannot use a \"yield\" here without parentheses") catch unreachable;
+ }
+ const value = p.parseExpr(.prefix);
+
+ if (p.fn_or_arrow_data_parse.arrow_arg_errors) |*args| {
+ args.invalid_expr_yield = name_range;
+ }
+
+ if (p.lexer.token == T.t_asterisk_asterisk) {
+ p.lexer.unexpected();
+ }
+
+ return p.e(E.Yield{ .value = value }, loc);
+ }
+ },
+ .allow_ident => {
+ // Try to gracefully recover if "yield" is used in the wrong place
+ if (!p.lexer.has_newline_before) {
+ switch (p.lexer.token) {
+ .t_null, .t_identifier, .t_false, .t_true, .t_numeric_literal, .t_big_integer_literal, .t_string_literal => {
+ p.log.addRangeError(p.source, name_range, "Cannot use \"yield\" outside a generator function") catch unreachable;
+ },
+ else => {},
+ }
+ }
+ },
+ }
+ },
+ .none => {},
+ }
+
+ // Handle the start of an arrow expression
+ if (p.lexer.token == .t_equals_greater_than) {
+ const ref = p.storeNameInRef(name) catch unreachable;
+ var args = p.allocator.alloc(Arg, 1) catch unreachable;
+ args[0] = Arg{ .binding = p.b(B.Identifier{
+ .ref = ref,
+ }, loc) };
+
+ _ = p.pushScopeForParsePass(.function_args, loc) catch unreachable;
+ defer p.popScope();
+ return p.e(p.parseArrowBody(args, p.m(FnOrArrowDataParse{})) catch unreachable, loc);
+ }
+
+ const ref = p.storeNameInRef(name) catch unreachable;
+
+ return p.e(E.Identifier{
+ .ref = ref,
+ }, loc);
+ },
+ .t_string_literal, .t_no_substitution_template_literal => {
+ return p.parseStringLiteral();
+ },
+ .t_template_head => {
+ var legacy_octal_loc = logger.Loc.Empty;
+ var head = p.lexer.string_literal;
+ var head_raw = p.lexer.raw();
+ if (p.lexer.legacy_octal_loc.start > loc.start) {
+ legacy_octal_loc = p.lexer.legacy_octal_loc;
+ }
+
+ var resp = p.parseTemplateParts(false);
+ const parts: []E.TemplatePart = resp.@"0";
+ const tail_legacy_octal_loc: logger.Loc = resp.@"1";
+ if (tail_legacy_octal_loc.start > 0) {
+ legacy_octal_loc = tail_legacy_octal_loc;
+ }
+ // Check if TemplateLiteral is unsupported. We don't care for this product.`
+ // if ()
+
+ return p.e(E.Template{ .head = head, .parts = parts, .legacy_octal_loc = legacy_octal_loc, .head_raw = head_raw }, loc);
+ },
+ .t_numeric_literal => {
+ const value = p.e(E.Number{ .value = p.lexer.number }, loc);
+ // p.checkForLegacyOctalLiteral()
+ p.lexer.next();
+ return value;
+ },
+ .t_big_integer_literal => {
+ const value = p.lexer.identifier;
+ // markSyntaxFeature bigInt
+ p.lexer.next();
+ return p.e(E.BigInt{ .value = value }, loc);
+ },
+ .t_slash, .t_slash_equals => {
+ p.lexer.scanRegExp();
+ const value = p.lexer.raw();
+ p.lexer.next();
+ return p.e(E.RegExp{ .value = value }, loc);
+ },
+ .t_void => {
+ p.lexer.next();
+ const value = p.parseExpr(.prefix);
+ if (p.lexer.token == .t_asterisk_asterisk) {
+ p.lexer.unexpected();
+ }
+
+ return p.e(E.Unary{
+ .op = .un_void,
+ .value = value,
+ }, loc);
+ },
+ .t_typeof => {
+ p.lexer.next();
+ const value = p.parseExpr(.prefix);
+ if (p.lexer.token == .t_asterisk_asterisk) {
+ p.lexer.unexpected();
+ }
+
+ return p.e(E.Unary{ .op = .un_typeof, .value = value }, loc);
+ },
+ .t_delete => {
+ p.lexer.next();
+ const value = p.parseExpr(.prefix);
+ if (p.lexer.token == .t_asterisk_asterisk) {
+ p.lexer.unexpected();
+ }
+ // TODO: add error deleting private identifier
+ // const private = value.data.e_private_identifier;
+ // if (private) |private| {
+ // const name = p.loadNameFromRef(private.ref);
+ // p.log.addRangeError(index.loc, )
+ // }
+
+ return p.e(E.Unary{ .op = .un_delete, .value = value }, loc);
+ },
+ .t_plus => {
+ p.lexer.next();
+ const value = p.parseExpr(.prefix);
+ if (p.lexer.token == .t_asterisk_asterisk) {
+ p.lexer.unexpected();
+ }
+
+ return p.e(E.Unary{ .op = .un_pos, .value = value }, loc);
+ },
+ .t_minus => {
+ p.lexer.next();
+ const value = p.parseExpr(.prefix);
+ if (p.lexer.token == .t_asterisk_asterisk) {
+ p.lexer.unexpected();
+ }
+
+ return p.e(E.Unary{ .op = .un_neg, .value = value }, loc);
+ },
+ .t_tilde => {
+ p.lexer.next();
+ const value = p.parseExpr(.prefix);
+ if (p.lexer.token == .t_asterisk_asterisk) {
+ p.lexer.unexpected();
+ }
+
+ return p.e(E.Unary{ .op = .un_cpl, .value = value }, loc);
+ },
+ .t_exclamation => {
+ p.lexer.next();
+ const value = p.parseExpr(.prefix);
+ if (p.lexer.token == .t_asterisk_asterisk) {
+ p.lexer.unexpected();
+ }
+
+ return p.e(E.Unary{ .op = .un_not, .value = value }, loc);
+ },
+ .t_minus_minus => {
+ p.lexer.next();
+ return p.e(E.Unary{ .op = .un_pre_dec, .value = p.parseExpr(.prefix) }, loc);
+ },
+ .t_plus_plus => {
+ p.lexer.next();
+ return p.e(E.Unary{ .op = .un_pre_inc, .value = p.parseExpr(.prefix) }, loc);
+ },
+ .t_function => {
+ return p.parseFnExpr(loc, false, logger.Range.None) catch unreachable;
+ },
+ .t_class => {
+ const classKeyword = p.lexer.range();
+ // markSyntaxFEatuer class
+ p.lexer.next();
+ var name: ?js_ast.LocRef = null;
+
+ _ = p.pushScopeForParsePass(.class_name, loc) catch unreachable;
+
+ // Parse an optional class name
+ if (p.lexer.token == .t_identifier and !js_lexer.StrictModeReservedWords.has(p.lexer.identifier)) {
+ name = js_ast.LocRef{ .loc = p.lexer.loc(), .ref = p.newSymbol(.other, p.lexer.identifier) catch unreachable };
+ p.lexer.next();
+ }
+
+ // Even anonymous classes can have TypeScript type parameters
+ if (p.options.ts) {
+ p.skipTypescriptTypeParameters();
+ }
+
+ const class = p.parseClass(classKeyword, name, ParseClassOptions{});
+ p.popScope();
+ return p.e(class, loc);
+ },
+ .t_new => {
+ p.lexer.next();
+
+ // Special-case the weird "new.target" expression here
+
+ const target = p.parseExprWithFlags(.member, flags);
+ var args: []Expr = &([_]Expr{});
+
+ if (p.options.ts) {
+ // Skip over TypeScript non-null assertions
+ if (p.lexer.token == .t_exclamation and !p.lexer.has_newline_before) {
+ p.lexer.next();
+ }
+
+ // Skip over TypeScript type arguments here if there are any
+ if (p.lexer.token == .t_less_than) {
+ _ = p.trySkipTypeScriptTypeArgumentsWithBacktracking();
+ }
+ }
+
+ if (p.lexer.token == .t_open_paren) {
+ args = p.parseCallArgs();
+ }
+
+ return p.e(E.New{
+ .target = target,
+ .args = args,
+ }, loc);
+ },
+ .t_open_bracket => {
+ p.lexer.next();
+ var is_single_line = !p.lexer.has_newline_before;
+ var items = List(Expr).init(p.allocator);
+ var self_errors = DeferredErrors{};
+ var comma_after_spread = logger.Loc{};
+
+ // Allow "in" inside arrays
+ const old_allow_in = p.allow_in;
+ p.allow_in = true;
+
+ while (p.lexer.token != .t_close_bracket) {
+ switch (p.lexer.token) {
+ .t_comma => {
+ items.append(p.e(E.Missing{}, p.lexer.loc())) catch unreachable;
+ },
+ .t_dot_dot_dot => {
+ // this might be wrong.
+ errors.array_spread_feature = p.lexer.range();
+
+ const dots_loc = p.lexer.loc();
+ p.lexer.next();
+ items.append(
+ p.parseExprOrBindings(.comma, &self_errors),
+ ) catch unreachable;
+ },
+ else => {
+ items.append(
+ p.parseExprOrBindings(.comma, &self_errors),
+ ) catch unreachable;
+ },
+ }
+
+ if (p.lexer.token != .t_comma) {
+ break;
+ }
+
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+
+ p.lexer.next();
+
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+ }
+
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+
+ p.lexer.expect(.t_close_bracket);
+ p.allow_in = old_allow_in;
+
+ if (p.willNeedBindingPattern()) {} else if (errors.isEmpty()) {
+ // Is this an expression?
+ p.logExprErrors(&self_errors);
+ } else {
+ // In this case, we can't distinguish between the two yet
+ self_errors.mergeInto(errors);
+ }
+ return p.e(E.Array{
+ .items = items.toOwnedSlice(),
+ .comma_after_spread = comma_after_spread,
+ .is_single_line = is_single_line,
+ }, loc);
+ },
+ .t_open_brace => {
+ p.lexer.next();
+ var is_single_line = !p.lexer.has_newline_before;
+ var properties = List(G.Property).init(p.allocator);
+ var self_errors = DeferredErrors{};
+ var comma_after_spread = logger.Loc{};
+
+ // Allow "in" inside object literals
+ const old_allow_in = p.allow_in;
+ p.allow_in = true;
+
+ while (p.lexer.token != .t_close_brace) {
+ if (p.lexer.token == .t_dot_dot_dot) {
+ p.lexer.next();
+ properties.append(G.Property{ .kind = .spread, .value = p.parseExpr(.comma) }) catch unreachable;
+
+ // Commas are not allowed here when destructuring
+ if (p.lexer.token == .t_comma) {
+ comma_after_spread = p.lexer.loc();
+ }
+ } else {
+ // This property may turn out to be a type in TypeScript, which should be ignored
+ var propertyOpts = PropertyOpts{};
+ if (p.parseProperty(.normal, &propertyOpts, &self_errors)) |prop| {
+ properties.append(prop) catch unreachable;
+ }
+ }
+
+ if (p.lexer.token != .t_comma) {
+ break;
+ }
+
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+
+ p.lexer.next();
+
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+ }
+
+ if (p.lexer.has_newline_before) {
+ is_single_line = false;
+ }
+
+ p.lexer.expect(.t_close_brace);
+ p.allow_in = old_allow_in;
+
+ if (p.willNeedBindingPattern()) {} else if (errors.isEmpty()) {
+ // Is this an expression?
+ p.logExprErrors(&self_errors);
+ } else {
+ // In this case, we can't distinguish between the two yet
+ self_errors.mergeInto(errors);
+ }
+ return p.e(E.Object{
+ .properties = properties.toOwnedSlice(),
+ .comma_after_spread = comma_after_spread,
+ .is_single_line = is_single_line,
+ }, loc);
+ },
+ .t_less_than => {
+ // This is a very complicated and highly ambiguous area of TypeScript
+ // syntax. Many similar-looking things are overloaded.
+ //
+ // TS:
+ //
+ // A type cast:
+ // <A>(x)
+ // <[]>(x)
+ // <A[]>(x)
+ //
+ // An arrow function with type parameters:
+ // <A>(x) => {}
+ // <A, B>(x) => {}
+ // <A = B>(x) => {}
+ // <A extends B>(x) => {}
+ //
+ // TSX:
+ //
+ // A JSX element:
+ // <A>(x) => {}</A>
+ // <A extends>(x) => {}</A>
+ // <A extends={false}>(x) => {}</A>
+ //
+ // An arrow function with type parameters:
+ // <A, B>(x) => {}
+ // <A extends B>(x) => {}
+ //
+ // A syntax error:
+ // <[]>(x)
+ // <A[]>(x)
+ // <A>(x) => {}
+ // <A = B>(x) => {}
+ if (p.options.ts and p.options.jsx.parse) {
+ var oldLexer = p.lexer;
+
+ p.lexer.next();
+ // Look ahead to see if this should be an arrow function instead
+ var is_ts_arrow_fn = false;
+
+ if (p.lexer.token == .t_identifier) {
+ p.lexer.next();
+ if (p.lexer.token == .t_comma) {
+ is_ts_arrow_fn = true;
+ } else if (p.lexer.token == .t_extends) {
+ p.lexer.next();
+ is_ts_arrow_fn = p.lexer.token != .t_equals and p.lexer.token != .t_greater_than;
+ }
+ }
+
+ // Restore the lexer
+ p.lexer = oldLexer;
+
+ if (is_ts_arrow_fn) {
+ p.skipTypescriptTypeParameters();
+ p.lexer.expect(.t_open_paren);
+ return p.parseParenExpr(loc, ParenExprOpts{ .force_arrow_fn = true }) catch unreachable;
+ }
+ }
+
+ if (p.options.jsx.parse) {
+ notimpl();
+ }
+
+ if (p.options.ts) {
+ notimpl();
+ }
+
+ p.lexer.unexpected();
+ return p.e(E.Missing{}, logger.Loc.Empty);
+ },
+ .t_import => {
+ p.lexer.next();
+ return p.parseImportExpr(loc, level);
+ },
+ else => {
+ p.lexer.unexpected();
+ return p.e(E.Missing{}, logger.Loc.Empty);
+ },
+ }
+
+ return p.e(E.Missing{}, logger.Loc.Empty);
+ }
+
+ pub fn jsxStringsToMemberExpression(p: *P, loc: logger.Loc, fragment: string) Expr {
+ notimpl();
+ }
+
+ // Note: The caller has already parsed the "import" keyword
+ pub fn parseImportExpr(p: *P, loc: logger.Loc, level: Level) Expr {
+ // Parse an "import.meta" expression
+ if (p.lexer.token == .t_dot) {
+ p.es6_import_keyword = js_lexer.rangeOfIdentifier(&p.source, loc);
+ p.lexer.next();
+ if (p.lexer.isContextualKeyword("meta")) {
+ const r = p.lexer.range();
+ p.lexer.next();
+ p.has_import_meta = true;
+ return p.e(E.ImportMeta{}, loc);
+ } else {
+ p.lexer.expectedString("\"meta\"");
+ }
+ }
+
+ if (level.gt(.call)) {
+ const r = js_lexer.rangeOfIdentifier(&p.source, loc);
+ p.log.addRangeError(p.source, r, "Cannot use an \"import\" expression here without parentheses") catch unreachable;
+ }
+ // allow "in" inside call arguments;
+ var old_allow_in = p.allow_in;
+ p.allow_in = true;
+
+ p.lexer.preserve_all_comments_before = true;
+ p.lexer.expect(.t_open_paren);
+ const comments = p.lexer.comments_to_preserve_before.toOwnedSlice();
+ p.lexer.preserve_all_comments_before = false;
+
+ const value = p.parseExpr(.comma);
+ p.lexer.expect(.t_close_paren);
+
+ p.allow_in = old_allow_in;
+ return p.e(E.Import{ .expr = value, .leading_interior_comments = comments, .import_record_index = 0 }, loc);
+ }
+
+ pub fn parseJSXElement(loc: logger.Loc) Expr {
+ // Parse the tag
+ //var startRange, startText, startTag := p.parseJSXTag();÷
+ notimpl();
+ return p.e(E.Missing{}, logger.Loc.Empty);
+ }
+
+ pub fn willNeedBindingPattern(p: *P) bool {
+ switch (p.lexer.token) {
+ .t_equals => {
+ // "[a] = b;"
+ return true;
+ },
+ .t_in => {
+ // "for ([a] in b) {}"
+ return !p.allow_in;
+ },
+ .t_identifier => {
+ // "for ([a] of b) {}"
+ return p.allow_in and p.lexer.isContextualKeyword("of");
+ },
+ else => {
+ return false;
+ },
+ }
+ }
+
+ pub fn trySkipTypeScriptTypeArgumentsWithBacktracking(p: *P) bool {
+ notimpl();
+ // return false;
+ }
+ pub fn parsePrefix(p: *P, level: Level, errors: ?*DeferredErrors, flags: Expr.EFlags) Expr {
+ return p._parsePrefix(level, errors orelse &DeferredErrors.None, flags);
+ }
+
+ pub fn appendPart(p: *P, parts: *List(js_ast.Part), stmts: []Stmt) !void {
+ p.symbol_uses = SymbolUseMap.init(p.allocator);
+ p.declared_symbols.deinit();
+ p.declared_symbols = @TypeOf(p.declared_symbols).init(p.allocator);
+ p.import_records_for_current_part.deinit();
+ p.import_records_for_current_part = @TypeOf(p.import_records_for_current_part).init(p.allocator);
+ p.scopes_for_current_part.deinit();
+ p.scopes_for_current_part = @TypeOf(p.scopes_for_current_part).init(p.allocator);
+ var opts = PrependTempRefsOpts{};
+ var partStmts = List(Stmt).fromOwnedSlice(p.allocator, stmts);
+ try p.visitStmtsAndPrependTempRefs(&partStmts, &opts);
+
+ // Insert any relocated variable statements now
+ if (p.relocated_top_level_vars.items.len > 0) {
+ var already_declared = RefBoolMap.init(p.allocator);
+ for (p.relocated_top_level_vars.items) |*local| {
+ // Follow links because "var" declarations may be merged due to hoisting
+ while (local.ref != null) {
+ const link = p.symbols.items[local.ref.?.inner_index].link orelse break;
+ if (link.isNull()) {
+ break;
+ }
+ local.ref = link;
+ }
+ const ref = local.ref orelse continue;
+ if (!already_declared.contains(ref)) {
+ try already_declared.put(ref, true);
+
+ const decls = try p.allocator.alloc(G.Decl, 1);
+ decls[0] = Decl{
+ .binding = p.b(B.Identifier{ .ref = ref }, local.loc),
+ };
+ try partStmts.append(p.s(S.Local{ .decls = decls }, local.loc));
+ }
+ }
+ p.relocated_top_level_vars.deinit();
+ p.relocated_top_level_vars = @TypeOf(p.relocated_top_level_vars).init(p.allocator);
+
+ // Follow links because "var" declarations may be merged due to hoisting
+
+ // while (true) {
+ // const link = p.symbols.items[local.ref.inner_index].link;
+ // }
+ }
+
+ if (partStmts.items.len > 0) {
+ const _stmts = partStmts.toOwnedSlice();
+ var part = js_ast.Part{
+ .stmts = _stmts,
+ .symbol_uses = p.symbol_uses,
+ .declared_symbols = p.declared_symbols.toOwnedSlice(),
+ .import_record_indices = p.import_records_for_current_part.toOwnedSlice(),
+ .scopes = p.scopes_for_current_part.toOwnedSlice(),
+ .can_be_removed_if_unused = p.stmtsCanBeRemovedIfUnused(_stmts),
+ };
+ try parts.append(part);
+ }
+ }
+
+ pub fn bindingCanBeRemovedIfUnused(p: *P, binding: Binding) bool {
+ switch (binding.data) {
+ .b_array => |bi| {
+ for (bi.items) |item| {
+ if (!p.bindingCanBeRemovedIfUnused(item.binding)) {
+ return false;
+ }
+
+ if (item.default_value) |default| {
+ if (!p.exprCanBeRemovedIfUnused(default)) {
+ return false;
+ }
+ }
+ }
+ },
+ .b_object => |bi| {
+ for (bi.properties) |property| {
+ if (!property.flags.is_spread and !p.exprCanBeRemovedIfUnused(property.key)) {
+ return false;
+ }
+
+ if (!p.bindingCanBeRemovedIfUnused(property.value)) {
+ return false;
+ }
+
+ if (property.default_value) |default| {
+ if (!p.exprCanBeRemovedIfUnused(default)) {
+ return false;
+ }
+ }
+ }
+ },
+ else => {},
+ }
+
+ return true;
+ }
+
+ pub fn stmtsCanBeRemovedIfUnused(p: *P, stmts: []Stmt) bool {
+ for (stmts) |stmt| {
+ switch (stmt.data) {
+ // These never have side effects
+ .s_function, .s_empty => {},
+
+ // Let these be removed if they are unused. Note that we also need to
+ // check if the imported file is marked as "sideEffects: false" before we
+ // can remove a SImport statement. Otherwise the import must be kept for
+ // its side effects.
+ .s_import => |st| {},
+ .s_class => |st| {
+ if (!p.classCanBeRemovedIfUnused(&st.class)) {
+ return false;
+ }
+ },
+ .s_expr => |st| {
+ if (st.does_not_affect_tree_shaking) {} else if (!p.exprCanBeRemovedIfUnused(st.value)) {
+ return false;
+ }
+ },
+ .s_local => |st| {
+ for (st.decls) |decl| {
+ if (!p.bindingCanBeRemovedIfUnused(decl.binding)) {
+ return false;
+ }
+
+ if (decl.value) |decl_value| {
+ if (!p.exprCanBeRemovedIfUnused(decl_value)) {
+ return false;
+ }
+ }
+ }
+ },
+
+ // Exports are tracked separately, so this isn't necessary
+ .s_export_clause, .s_export_from => {},
+
+ .s_export_default => |st| {
+ switch (st.value) {
+ .stmt => |s2| {
+ switch (s2.data) {
+ // These never have side effects
+ .s_function => {},
+ .s_class => |class| {
+ if (!p.classCanBeRemovedIfUnused(&class.class)) {
+ return false;
+ }
+ },
+ else => {
+ std.debug.panic("Unexpected type in export default: {s}", .{s2});
+ },
+ }
+ },
+ .expr => |exp| {
+ if (!p.exprCanBeRemovedIfUnused(exp)) {
+ return false;
+ }
+ },
+ }
+ },
+ else => {
+ return false;
+ },
+ }
+ }
+
+ return true;
+ }
+
+ pub fn visitStmtsAndPrependTempRefs(p: *P, stmts: *List(Stmt), opts: *PrependTempRefsOpts) !void {
+ var old_temp_refs = p.temp_refs_to_declare;
+ var old_temp_ref_count = p.temp_ref_count;
+ p.temp_refs_to_declare.deinit();
+ p.temp_refs_to_declare = @TypeOf(p.temp_refs_to_declare).init(p.allocator);
+ p.temp_ref_count = 0;
+
+ try p.visitStmts(stmts, opts.kind);
+
+ // Prepend values for "this" and "arguments"
+ if (opts.fn_body_loc != null) {
+ // Capture "this"
+ if (p.fn_only_data_visit.this_capture_ref) |ref| {
+ try p.temp_refs_to_declare.append(TempRef{
+ .ref = ref,
+ .value = p.e(E.This{}, opts.fn_body_loc orelse p.panic("Internal error: Expected opts.fn_body_loc to exist", .{})),
+ });
+ }
+ }
+ }
+
+ pub fn recordDeclaredSymbol(p: *P, ref: Ref) !void {
+ try p.declared_symbols.append(js_ast.DeclaredSymbol{
+ .ref = ref,
+ .is_top_level = p.current_scope == p.module_scope,
+ });
+ }
+
+ pub fn visitExpr(p: *P, expr: Expr) Expr {
+ return p.visitExprInOut(expr, ExprIn{});
+ }
+
+ pub fn visitFunc(p: *P, func: *G.Fn, open_parens_loc: logger.Loc) void {
+ const old_fn_or_arrow_data = p.fn_or_arrow_data_visit;
+ defer p.fn_or_arrow_data_visit = old_fn_or_arrow_data;
+ const old_fn_only_data = p.fn_only_data_visit;
+ defer p.fn_only_data_visit = old_fn_only_data;
+ p.fn_or_arrow_data_visit = FnOrArrowDataVisit{ .is_async = func.flags.is_async };
+ p.fn_only_data_visit = FnOnlyDataVisit{ .is_this_nested = true, .arguments_ref = func.arguments_ref };
+
+ if (func.name) |name| {
+ p.recordDeclaredSymbol(name.ref.?) catch unreachable;
+ const symbol_name = p.symbols.items[name.ref.?.inner_index].original_name;
+ if (isEvalOrArguments(symbol_name)) {
+ p.markStrictModeFeature(.eval_or_arguments, js_lexer.rangeOfIdentifier(&p.source, name.loc), symbol_name) catch unreachable;
+ }
+ }
+
+ p.pushScopeForVisitPass(.function_args, open_parens_loc) catch unreachable;
+ defer p.popScope();
+ p.visitArgs(
+ func.args,
+ VisitArgsOpts{
+ .has_rest_arg = func.flags.has_rest_arg,
+ .body = func.body.?.stmts,
+ .is_unique_formal_parameters = true,
+ },
+ );
+
+ var body = func.body orelse p.panic("Expected visitFunc to have body {s}", .{func});
+ p.pushScopeForVisitPass(.function_body, body.loc) catch unreachable;
+ defer p.popScope();
+ var stmts = List(Stmt).fromOwnedSlice(p.allocator, body.stmts);
+ var temp_opts = PrependTempRefsOpts{ .kind = StmtsKind.fn_body, .fn_body_loc = body.loc };
+ p.visitStmtsAndPrependTempRefs(&stmts, &temp_opts) catch unreachable;
+
+ body.stmts = stmts.toOwnedSlice();
+
+ func.body = body;
+ }
+
+ pub fn maybeKeepExprSymbolName(p: *P, expr: Expr, original_name: string, was_anonymous_named_expr: bool) Expr {
+ return if (was_anonymous_named_expr) p.keepExprSymbolName(expr, original_name) else expr;
+ }
+
+ pub fn valueForThis(p: *P, loc: logger.Loc) ?Expr {
+ // Substitute "this" if we're inside a static class property initializer
+ if (p.fn_only_data_visit.this_class_static_ref) |*ref| {
+ p.recordUsage(ref);
+ return p.e(E.Identifier{ .ref = ref.* }, loc);
+ }
+
+ // oroigianlly was !=- modepassthrough
+ if (!p.fn_only_data_visit.is_this_nested) {
+ if (p.has_es_module_syntax) {
+ // In an ES6 module, "this" is supposed to be undefined. Instead of
+ // doing this at runtime using "fn.call(undefined)", we do it at
+ // compile time using expression substitution here.
+ return p.e(E.Undefined{}, loc);
+ } else {
+ // In a CommonJS module, "this" is supposed to be the same as "exports".
+ // Instead of doing this at runtime using "fn.call(module.exports)", we
+ // do it at compile time using expression substitution here.
+ p.recordUsage(&p.exports_ref);
+ return p.e(E.Identifier{ .ref = p.exports_ref }, loc);
+ }
+ }
+
+ return null;
+ }
+
+ pub fn visitExprInOut(p: *P, expr: Expr, in: ExprIn) Expr {
+ switch (expr.data) {
+ .e_null, .e_super, .e_boolean, .e_big_int, .e_reg_exp, .e_new_target, .e_undefined => {},
+ .e_string => |e_| {
+ // If you're using this, you're probably not using 0-prefixed legacy octal notation
+ // if e.LegacyOctalLoc.Start > 0 {
+ },
+ .e_number => |e_| {
+ // idc about legacy octal loc
+ },
+ .e_this => |e_| {
+ if (p.valueForThis(expr.loc)) |exp| {
+ return exp;
+ }
+
+ // // Capture "this" inside arrow functions that will be lowered into normal
+ // // function expressions for older language environments
+ // if p.fnOrArrowDataVisit.isArrow && p.options.unsupportedJSFeatures.Has(compat.Arrow) && p.fnOnlyDataVisit.isThisNested {
+ // return js_ast.Expr{Loc: expr.Loc, Data: &js_ast.EIdentifier{Ref: p.captureThis()}}, exprOut{}
+ // }
+ },
+
+ .e_import_meta => |exp| {
+ const is_delete_target = std.meta.activeTag(p.delete_target) == .e_import_meta and exp == p.delete_target.e_import_meta;
+
+ if (p.define.dots.get("meta")) |meta| {
+ for (meta) |define| {
+ if (p.isDotDefineMatch(expr, define.parts)) {
+ // Substitute user-specified defines
+ return p.valueForDefine(expr.loc, in.assign_target, is_delete_target, &define.data);
+ }
+ }
+ }
+
+ if (!p.import_meta_ref.isNull()) {
+ p.recordUsage(&p.import_meta_ref);
+ return p.e(E.Identifier{ .ref = p.import_meta_ref }, expr.loc);
+ }
+ },
+ .e_spread => |exp| {
+ exp.value = p.visitExpr(exp.value);
+ },
+ .e_identifier => |e_| {
+ const is_delete_target = @as(Expr.Tag, p.delete_target) == .e_identifier and e_ == p.delete_target.e_identifier;
+
+ const name = p.loadNameFromRef(e_.ref);
+ if (p.isStrictMode() and js_lexer.StrictModeReservedWords.has(name)) {
+ p.markStrictModeFeature(.reserved_word, js_lexer.rangeOfIdentifier(&p.source, expr.loc), name) catch unreachable;
+ }
+
+ const result = p.findSymbol(expr.loc, name) catch unreachable;
+
+ e_.must_keep_due_to_with_stmt = result.is_inside_with_scope;
+ e_.ref = result.ref;
+
+ // Handle assigning to a constant
+ if (in.assign_target != .none and p.symbols.items[result.ref.inner_index].kind == .cconst) {
+ const r = js_lexer.rangeOfIdentifier(&p.source, expr.loc);
+ p.log.addRangeErrorFmt(p.source, r, p.allocator, "Cannot assign to {s} because it is a constant", .{name}) catch unreachable;
+ }
+
+ var original_name: ?string = null;
+
+ // Substitute user-specified defines for unbound symbols
+ if (p.symbols.items[e_.ref.inner_index].kind == .unbound and !result.is_inside_with_scope and !is_delete_target) {
+ if (p.define.identifiers.get(name)) |def| {
+ if (!def.isUndefined()) {
+ const newvalue = p.valueForDefine(expr.loc, in.assign_target, is_delete_target, &def);
+
+ // Don't substitute an identifier for a non-identifier if this is an
+ // assignment target, since it'll cause a syntax error
+ if (@as(Expr.Tag, newvalue.data) == .e_identifier or in.assign_target == .none) {
+ return newvalue;
+ }
+
+ original_name = def.original_name;
+ }
+
+ // Copy the side effect flags over in case this expression is unused
+ if (def.can_be_removed_if_unused) {
+ e_.can_be_removed_if_unused = true;
+ }
+ if (def.call_can_be_unwrapped_if_unused and !p.options.ignore_dce_annotations) {
+ e_.call_can_be_unwrapped_if_unused = true;
+ }
+ }
+ }
+
+ return p.handleIdentifier(expr.loc, e_, original_name, IdentifierOpts{
+ .assign_target = in.assign_target,
+ .is_delete_target = is_delete_target,
+ .was_originally_identifier = true,
+ });
+ },
+ .e_private_identifier => |e_| {
+ p.panic("Unexpected private identifier. This is an internal error - not your fault.", .{});
+ },
+ .e_jsx_element => |e_| {
+ const tag = tagger: {
+ if (e_.tag) |_tag| {
+ break :tagger p.visitExpr(_tag);
+ } else {
+ break :tagger p.jsxStringsToMemberExpression(expr.loc, p.options.jsx.fragment);
+ }
+ };
+
+ // Visit properties
+ var i: usize = 0;
+ while (i < e_.properties.len) : (i += 1) {
+ const property = e_.properties[i];
+ if (property.kind != .spread) {
+ e_.properties[i].key = p.visitExpr(e_.properties[i].key.?);
+ }
+
+ if (property.value != null) {
+ e_.properties[i].value = p.visitExpr(e_.properties[i].value.?);
+ }
+
+ if (property.initializer != null) {
+ e_.properties[i].initializer = p.visitExpr(e_.properties[i].initializer.?);
+ }
+ }
+
+ // Arguments to createElement()
+ const args = p.allocator.alloc(Expr, 1 + e_.children.len) catch unreachable;
+ i = 1;
+ if (e_.properties.len > 0) {
+ args[0] = p.e(E.Object{ .properties = e_.properties }, expr.loc);
+ } else {
+ args[0] = p.e(E.Null{}, expr.loc);
+ }
+
+ for (e_.children) |child| {
+ args[i] = p.visitExpr(child);
+ i += 1;
+ }
+
+ // Call createElement()
+ return p.e(E.Call{
+ .target = p.jsxStringsToMemberExpression(expr.loc, p.options.jsx.factory),
+ .args = args,
+ // Enable tree shaking
+ .can_be_unwrapped_if_unused = !p.options.ignore_dce_annotations,
+ }, expr.loc);
+ },
+
+ .e_template => |e_| {
+ if (e_.tag) |tag| {
+ e_.tag = p.visitExpr(tag);
+ }
+
+ var i: usize = 0;
+ while (i < e_.parts.len) : (i += 1) {
+ e_.parts[i].value = p.visitExpr(e_.parts[i].value);
+ }
+ },
+
+ .e_binary => |e_| {
+ switch (e_.left.data) {
+ // Special-case private identifiers
+ .e_private_identifier => |private| {
+ if (e_.op == .bin_in) {
+ const name = p.loadNameFromRef(private.ref);
+ const result = p.findSymbol(e_.left.loc, name) catch unreachable;
+ private.ref = result.ref;
+
+ // Unlike regular identifiers, there are no unbound private identifiers
+ const symbol: Symbol = p.symbols.items[result.ref.inner_index];
+ if (!Symbol.isKindPrivate(symbol.kind)) {
+ const r = logger.Range{ .loc = e_.left.loc, .len = @intCast(i32, name.len) };
+ p.log.addRangeErrorFmt(p.source, r, p.allocator, "Private name \"{s}\" must be declared in an enclosing class", .{name}) catch unreachable;
+ }
+
+ e_.right = p.visitExpr(e_.right);
+ // privateSymbolNeedsToBeLowered
+ return expr;
+ }
+ },
+ else => {},
+ }
+
+ const is_call_target = @as(Expr.Tag, p.call_target) == .e_binary and e_ == p.call_target.e_binary;
+ const is_stmt_expr = @as(Expr.Tag, p.stmt_expr_value) == .e_binary and e_ == p.stmt_expr_value.e_binary;
+ const was_anonymous_named_expr = p.isAnonymousNamedExpr(e_.right);
+
+ e_.left = p.visitExprInOut(e_.left, ExprIn{
+ .assign_target = e_.op.binaryAssignTarget(),
+ });
+
+ // Mark the control flow as dead if the branch is never taken
+ switch (e_.op) {
+ .bin_logical_or => {
+ const side_effects = SideEffects.toBoolean(e_.left.data);
+ if (side_effects.ok and side_effects.value) {
+ // "true || dead"
+ const old = p.is_control_flow_dead;
+ p.is_control_flow_dead = true;
+ e_.right = p.visitExpr(e_.right);
+ p.is_control_flow_dead = old;
+ } else {
+ e_.right = p.visitExpr(e_.right);
+ }
+ },
+ .bin_logical_and => {
+ const side_effects = SideEffects.toBoolean(e_.left.data);
+ if (side_effects.ok and side_effects.value) {
+ // "false && dead"
+ const old = p.is_control_flow_dead;
+ p.is_control_flow_dead = true;
+ e_.right = p.visitExpr(e_.right);
+ p.is_control_flow_dead = old;
+ } else {
+ e_.right = p.visitExpr(e_.right);
+ }
+ },
+ .bin_nullish_coalescing => {
+ const side_effects = SideEffects.toNullOrUndefined(e_.left.data);
+ if (side_effects.ok and side_effects.value) {
+ // "false && dead"
+ const old = p.is_control_flow_dead;
+ p.is_control_flow_dead = true;
+ e_.right = p.visitExpr(e_.right);
+ p.is_control_flow_dead = old;
+ } else {
+ e_.right = p.visitExpr(e_.right);
+ }
+ },
+ else => {
+ e_.right = p.visitExpr(e_.right);
+ },
+ }
+
+ // Always put constants on the right for equality comparisons to help
+ // reduce the number of cases we have to check during pattern matching. We
+ // can only reorder expressions that do not have any side effects.
+ switch (e_.op) {
+ .bin_loose_eq, .bin_loose_ne, .bin_strict_eq, .bin_strict_ne => {
+ if (SideEffects.isPrimitiveToReorder(e_.left.data) and !SideEffects.isPrimitiveToReorder(e_.right.data)) {
+ const _left = e_.left;
+ const _right = e_.right;
+ e_.left = _right;
+ e_.right = _left;
+ }
+ },
+ else => {},
+ }
+
+ switch (e_.op) {
+ .bin_comma => {
+ // notimpl();
+ },
+ .bin_loose_eq => {
+ const equality = SideEffects.eql(e_.left.data, e_.right.data);
+ if (equality.ok) {
+ return p.e(
+ E.Boolean{ .value = equality.equal },
+ expr.loc,
+ );
+ }
+
+ // const after_op_loc = locAfterOp(e_.);
+ // TODO: warn about equality check
+ // TODO: warn about typeof string
+
+ },
+ .bin_strict_eq => {
+ const equality = SideEffects.eql(e_.left.data, e_.right.data);
+ if (equality.ok) {
+ return p.e(E.Boolean{ .value = equality.ok }, expr.loc);
+ }
+
+ // const after_op_loc = locAfterOp(e_.);
+ // TODO: warn about equality check
+ // TODO: warn about typeof string
+ },
+ .bin_loose_ne => {
+ const equality = SideEffects.eql(e_.left.data, e_.right.data);
+ if (equality.ok) {
+ return p.e(E.Boolean{ .value = !equality.ok }, expr.loc);
+ }
+ // const after_op_loc = locAfterOp(e_.);
+ // TODO: warn about equality check
+ // TODO: warn about typeof string
+
+ // "x != void 0" => "x != null"
+ if (@as(Expr.Tag, e_.right.data) == .e_undefined) {
+ e_.right = p.e(E.Null{}, e_.right.loc);
+ }
+ },
+ .bin_strict_ne => {
+ const equality = SideEffects.eql(e_.left.data, e_.right.data);
+ if (equality.ok) {
+ return p.e(E.Boolean{ .value = !equality.ok }, expr.loc);
+ }
+ },
+ .bin_nullish_coalescing => {
+ const nullorUndefined = SideEffects.toNullOrUndefined(e_.left.data);
+ if (!nullorUndefined.value) {
+ return e_.left;
+ } else if (nullorUndefined.side_effects == .no_side_effects) {
+ // TODO:
+ // "(null ?? fn)()" => "fn()"
+ // "(null ?? this.fn)" => "this.fn"
+ // "(null ?? this.fn)()" => "(0, this.fn)()"
+
+ }
+ },
+ .bin_logical_or => {
+ const side_effects = SideEffects.toBoolean(e_.left.data);
+ if (side_effects.ok and side_effects.value) {
+ return e_.left;
+ } else if (side_effects.ok) {
+ // TODO:
+ // "(0 || fn)()" => "fn()"
+ // "(0 || this.fn)" => "this.fn"
+ // "(0 || this.fn)()" => "(0, this.fn)()"
+ }
+ },
+ .bin_logical_and => {
+ const side_effects = SideEffects.toBoolean(e_.left.data);
+ if (side_effects.ok) {
+ return e_.left;
+ }
+
+ // TODO:
+ // "(1 && fn)()" => "fn()"
+ // "(1 && this.fn)" => "this.fn"
+ // "(1 && this.fn)()" => "(0, this.fn)()"
+ },
+ .bin_add => {
+ if (p.should_fold_numeric_constants) {
+ if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
+ return p.e(E.Number{ .value = vals[0] + vals[1] }, expr.loc);
+ }
+ }
+
+ // TODO: fold string addition
+ },
+ .bin_sub => {
+ if (p.should_fold_numeric_constants) {
+ if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
+ return p.e(E.Number{ .value = vals[0] - vals[1] }, expr.loc);
+ }
+ }
+ },
+ .bin_mul => {
+ if (p.should_fold_numeric_constants) {
+ if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
+ return p.e(E.Number{ .value = vals[0] * vals[1] }, expr.loc);
+ }
+ }
+ },
+ .bin_div => {
+ if (p.should_fold_numeric_constants) {
+ if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
+ return p.e(E.Number{ .value = vals[0] / vals[1] }, expr.loc);
+ }
+ }
+ },
+ .bin_rem => {
+ if (p.should_fold_numeric_constants) {
+ if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
+ // is this correct?
+ return p.e(E.Number{ .value = std.math.mod(f64, vals[0], vals[1]) catch 0.0 }, expr.loc);
+ }
+ }
+ },
+ .bin_pow => {
+ if (p.should_fold_numeric_constants) {
+ if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
+ return p.e(E.Number{ .value = std.math.pow(f64, vals[0], vals[1]) }, expr.loc);
+ }
+ }
+ },
+ .bin_shl => {
+ // TODO:
+ // if (p.should_fold_numeric_constants) {
+ // if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
+ // return p.e(E.Number{ .value = ((@floatToInt(i32, vals[0]) << @floatToInt(u32, vals[1])) & 31) }, expr.loc);
+ // }
+ // }
+ },
+ .bin_shr => {
+ // TODO:
+ // if (p.should_fold_numeric_constants) {
+ // if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
+ // return p.e(E.Number{ .value = ((@floatToInt(i32, vals[0]) >> @floatToInt(u32, vals[1])) & 31) }, expr.loc);
+ // }
+ // }
+ },
+ .bin_u_shr => {
+ // TODO:
+ // if (p.should_fold_numeric_constants) {
+ // if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
+ // return p.e(E.Number{ .value = ((@floatToInt(i32, vals[0]) >> @floatToInt(u32, vals[1])) & 31) }, expr.loc);
+ // }
+ // }
+ },
+ .bin_bitwise_and => {
+ // TODO:
+ // if (p.should_fold_numeric_constants) {
+ // if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
+ // return p.e(E.Number{ .value = ((@floatToInt(i32, vals[0]) >> @floatToInt(u32, vals[1])) & 31) }, expr.loc);
+ // }
+ // }
+ },
+ .bin_bitwise_or => {
+ // TODO:
+ // if (p.should_fold_numeric_constants) {
+ // if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
+ // return p.e(E.Number{ .value = ((@floatToInt(i32, vals[0]) >> @floatToInt(u32, vals[1])) & 31) }, expr.loc);
+ // }
+ // }
+ },
+ .bin_bitwise_xor => {
+ // TODO:
+ // if (p.should_fold_numeric_constants) {
+ // if (Expr.extractNumericValues(e_.left.data, e_.right.data)) |vals| {
+ // return p.e(E.Number{ .value = ((@floatToInt(i32, vals[0]) >> @floatToInt(u32, vals[1])) & 31) }, expr.loc);
+ // }
+ // }
+ },
+ // ---------------------------------------------------------------------------------------------------
+ // ---------------------------------------------------------------------------------------------------
+ // ---------------------------------------------------------------------------------------------------
+ // ---------------------------------------------------------------------------------------------------
+ .bin_assign => {
+
+ // Optionally preserve the name
+ if (@as(Expr.Tag, e_.left.data) == .e_identifier) {
+ e_.right = p.maybeKeepExprSymbolName(e_.right, p.symbols.items[e_.left.data.e_identifier.ref.inner_index].original_name, was_anonymous_named_expr);
+ }
+ },
+ .bin_add_assign => {
+ // notimpl();
+ },
+ .bin_sub_assign => {
+ // notimpl();
+ },
+ .bin_mul_assign => {
+ // notimpl();
+ },
+ .bin_div_assign => {
+ // notimpl();
+ },
+ .bin_rem_assign => {
+ // notimpl();
+ },
+ .bin_pow_assign => {
+ // notimpl();
+ },
+ .bin_shl_assign => {
+ // notimpl();
+ },
+ .bin_shr_assign => {
+ // notimpl();
+ },
+ .bin_u_shr_assign => {
+ // notimpl();
+ },
+ .bin_bitwise_or_assign => {
+ // notimpl();
+ },
+ .bin_bitwise_and_assign => {
+ // notimpl();
+ },
+ .bin_bitwise_xor_assign => {
+ // notimpl();
+ },
+ .bin_nullish_coalescing_assign => {
+ // notimpl();
+ },
+ .bin_logical_and_assign => {
+ // notimpl();
+ },
+ .bin_logical_or_assign => {
+ // notimpl();
+ },
+ else => {},
+ }
+ },
+ .e_index => |e_| {
+ const is_call_target = std.meta.activeTag(p.call_target) == .e_index and e_ == p.call_target.e_index;
+ const is_delete_target = std.meta.activeTag(p.delete_target) == .e_index and e_ == p.delete_target.e_index;
+
+ const target = p.visitExprInOut(e_.target, ExprIn{
+ // this is awkward due to a zig compiler bug
+ .has_chain_parent = (e_.optional_chain orelse js_ast.OptionalChain.start) == js_ast.OptionalChain.ccontinue,
+ });
+ e_.target = target;
+
+ if (e_.optional_chain == null and @as(Expr.Tag, e_.index.data) == .e_string) {
+ if (p.maybeRewritePropertyAccess(
+ expr.loc,
+ in.assign_target,
+ is_delete_target,
+ e_.target,
+ p.lexer.utf16ToString(e_.index.data.e_string.value),
+ e_.index.loc,
+ is_call_target,
+ )) |val| {
+ return val;
+ }
+ }
+
+ // Create an error for assigning to an import namespace when bundling. Even
+ // though this is a run-time error, we make it a compile-time error when
+ // bundling because scope hoisting means these will no longer be run-time
+ // errors.
+ if ((in.assign_target != .none or is_delete_target) and @as(Expr.Tag, e_.target.data) == .e_identifier) {
+ const r = js_lexer.rangeOfIdentifier(&p.source, e_.target.loc);
+ p.log.addRangeErrorFmt(
+ p.source,
+ r,
+ p.allocator,
+ "Cannot assign to property on import \"{s}\"",
+ .{p.symbols.items[e_.target.data.e_identifier.ref.inner_index].original_name},
+ ) catch unreachable;
+ }
+
+ return p.e(e_, expr.loc);
+ },
+ .e_unary => |e_| {
+ switch (e_.op) {
+ .un_typeof => {
+ e_.value = p.visitExprInOut(e_.value, ExprIn{ .assign_target = e_.op.unaryAssignTarget() });
+
+ if (SideEffects.toTypeof(e_.value.data)) |typeof| {
+ return p.e(E.String{ .value = p.lexer.stringToUTF16(typeof) }, expr.loc);
+ }
+ },
+ .un_delete => {
+ e_.value = p.visitExprInOut(e_.value, ExprIn{ .has_chain_parent = true });
+ },
+ else => {
+ e_.value = p.visitExprInOut(e_.value, ExprIn{ .assign_target = e_.op.unaryAssignTarget() });
+
+ // Post-process the unary expression
+
+ switch (e_.op) {
+ .un_not => {
+ const side_effects = SideEffects.toBoolean(e_.value.data);
+ if (side_effects.ok) {
+ return p.e(E.Boolean{ .value = !side_effects.value }, expr.loc);
+ }
+
+ // maybe won't do this idk
+ if (Expr.maybeSimplifyNot(&e_.value, p.allocator)) |exp| {
+ return exp;
+ }
+ },
+ .un_void => {
+ if (p.exprCanBeRemovedIfUnused(e_.value)) {
+ return p.e(E.Undefined{}, e_.value.loc);
+ }
+ },
+ .un_pos => {
+ if (SideEffects.toNumber(e_.value.data)) |num| {
+ return p.e(E.Number{ .value = num }, expr.loc);
+ }
+ },
+ .un_neg => {
+ if (SideEffects.toNumber(e_.value.data)) |num| {
+ return p.e(E.Number{ .value = -num }, expr.loc);
+ }
+ },
+
+ ////////////////////////////////////////////////////////////////////////////////
+
+ .un_pre_dec => {
+ // TODO: private fields
+ },
+ .un_pre_inc => {
+ // TODO: private fields
+ },
+ .un_post_dec => {
+ // TODO: private fields
+ },
+ .un_post_inc => {
+ // TODO: private fields
+ },
+ else => {},
+ }
+ },
+ }
+ },
+ .e_dot => |e_| {
+ const is_delete_target = @as(Expr.Tag, p.delete_target) == .e_dot and e_ == p.delete_target.e_dot;
+ const is_call_target = @as(Expr.Tag, p.call_target) == .e_dot and e_ == p.call_target.e_dot;
+
+ if (p.define.dots.get(e_.name)) |parts| {
+ for (parts) |define| {
+ if (p.isDotDefineMatch(expr, define.parts)) {
+ // Substitute user-specified defines
+ if (!define.data.isUndefined()) {
+ // TODO: check this doesn't crash due to the pointer no longer being allocated
+ return p.valueForDefine(expr.loc, in.assign_target, is_delete_target, &define.data);
+ }
+
+ // Copy the side effect flags over in case this expression is unused
+ if (define.data.can_be_removed_if_unused) {
+ e_.can_be_removed_if_unused = true;
+ }
+
+ if (define.data.call_can_be_unwrapped_if_unused and !p.options.ignore_dce_annotations) {
+ e_.call_can_be_unwrapped_if_unused = true;
+ }
+
+ break;
+ }
+ }
+ }
+
+ // Track ".then().catch()" chains
+ if (is_call_target and @as(Expr.Tag, p.then_catch_chain.next_target) == .e_dot and p.then_catch_chain.next_target.e_dot == e_) {
+ if (strings.eql(e_.name, "catch")) {
+ p.then_catch_chain = ThenCatchChain{
+ .next_target = e_.target.data,
+ .has_catch = true,
+ };
+ } else if (strings.eql(e_.name, "then")) {
+ p.then_catch_chain = ThenCatchChain{
+ .next_target = e_.target.data,
+ .has_catch = p.then_catch_chain.has_catch or p.then_catch_chain.has_multiple_args,
+ };
+ }
+ }
+
+ e_.target = p.visitExpr(e_.target);
+ if (e_.optional_chain == null) {
+ if (p.maybeRewritePropertyAccess(
+ expr.loc,
+ in.assign_target,
+ is_delete_target,
+ e_.target,
+ e_.name,
+ e_.name_loc,
+ is_call_target,
+ )) |_expr| {
+ return _expr;
+ }
+ }
+ },
+ .e_if => |e_| {
+ const is_call_target = (p.call_target) == .e_if and e_ == p.call_target.e_if;
+
+ e_.test_ = p.visitExpr(e_.test_);
+
+ const side_effects = SideEffects.toBoolean(e_.test_.data);
+
+ if (side_effects.ok) {
+ // Mark the control flow as dead if the branch is never taken
+ if (side_effects.value) {
+ // "true ? live : dead"
+ e_.yes = p.visitExpr(e_.yes);
+ const old = p.is_control_flow_dead;
+ p.is_control_flow_dead = true;
+ e_.no = p.visitExpr(e_.no);
+ p.is_control_flow_dead = old;
+ } else {
+ // "false ? dead : live"
+ const old = p.is_control_flow_dead;
+ p.is_control_flow_dead = true;
+ e_.yes = p.visitExpr(e_.yes);
+ p.is_control_flow_dead = old;
+ e_.no = p.visitExpr(e_.no);
+ }
+ } else {
+ e_.yes = p.visitExpr(e_.yes);
+ e_.no = p.visitExpr(e_.no);
+ }
+ },
+ .e_await => |e_| {
+ p.await_target = e_.value.data;
+ e_.value = p.visitExpr(e_.value);
+ },
+ .e_yield => |e_| {
+ if (e_.value) |val| {
+ e_.value = p.visitExpr(val);
+ }
+ },
+ .e_array => |e_| {
+ if (in.assign_target != .none) {
+ if (e_.comma_after_spread) |spread| {
+ p.log.addRangeError(p.source, logger.Range{ .loc = spread, .len = 1 }, "Unexpected \",\" after rest pattern") catch unreachable;
+ }
+ }
+
+ var has_spread = false;
+ var i: usize = 0;
+ while (i < e_.items.len) : (i += 1) {
+ var item = e_.items[i];
+ const data = item.data;
+ switch (data) {
+ .e_missing => {},
+ .e_spread => |spread| {
+ spread.value = p.visitExprInOut(spread.value, ExprIn{ .assign_target = in.assign_target });
+ },
+ .e_binary => |e2| {
+ if (in.assign_target != .none and e2.op == .bin_assign) {
+ const was_anonymous_named_expr = p.isAnonymousNamedExpr(e2.right);
+ e2.left = p.visitExprInOut(e2.left, ExprIn{ .assign_target = .replace });
+ e2.right = p.visitExpr(e2.right);
+
+ if (@as(Expr.Tag, e2.left.data) == .e_identifier) {
+ e2.right = p.maybeKeepExprSymbolName(
+ e2.right,
+ p.symbols.items[e2.left.data.e_identifier.ref.inner_index].original_name,
+ was_anonymous_named_expr,
+ );
+ }
+ } else {
+ item = p.visitExprInOut(item, ExprIn{ .assign_target = in.assign_target });
+ }
+ },
+ else => {
+ item = p.visitExprInOut(item, ExprIn{ .assign_target = in.assign_target });
+ },
+ }
+ e_.items[i] = item;
+ }
+ },
+ .e_object => |e_| {
+ if (in.assign_target != .none) {
+ p.maybeCommaSpreadError(e_.comma_after_spread);
+ var has_spread = false;
+ var has_proto = false;
+
+ var i: usize = 0;
+ while (i < e_.properties.len) : (i += 1) {
+ var property = e_.properties[i];
+
+ if (property.kind != .spread) {
+ const key = p.visitExpr(property.key orelse std.debug.panic("Expected property key", .{}));
+ e_.properties[i].key = key;
+
+ // Forbid duplicate "__proto__" properties according to the specification
+ if (!property.flags.is_computed and !property.flags.was_shorthand and !property.flags.is_method and in.assign_target == .none and key.data.isStringValue() and strings.utf16EqlString(
+ key.data.e_string.value,
+ "__proto__",
+ )) {
+ if (has_proto) {
+ const r = js_lexer.rangeOfIdentifier(&p.source, key.loc);
+ p.log.addRangeError(p.source, r, "Cannot specify the \"__proto__\" property more than once per object") catch unreachable;
+ }
+ has_proto = true;
+ }
+ } else {
+ has_spread = true;
+ }
+
+ // Extract the initializer for expressions like "({ a: b = c } = d)"
+ if (in.assign_target != .none and property.initializer != null and property.value != null) {
+ switch (property.value.?.data) {
+ .e_binary => |bin| {
+ if (bin.op == .bin_assign) {
+ property.initializer = bin.right;
+ property.value = bin.left;
+ }
+ },
+ else => {},
+ }
+ }
+
+ if (property.value != null) {
+ property.value = p.visitExprInOut(property.value.?, ExprIn{ .assign_target = in.assign_target });
+ }
+
+ if (property.initializer != null) {
+ const was_anonymous_named_expr = p.isAnonymousNamedExpr(property.initializer orelse unreachable);
+ property.initializer = p.visitExprInOut(property.initializer.?, ExprIn{ .assign_target = in.assign_target });
+
+ if (property.value) |val| {
+ if (@as(Expr.Tag, val.data) == .e_identifier) {
+ property.initializer = p.maybeKeepExprSymbolName(
+ property.initializer orelse unreachable,
+ p.symbols.items[val.data.e_identifier.ref.inner_index].original_name,
+ was_anonymous_named_expr,
+ );
+ }
+ }
+ }
+
+ // TODO: can we avoid htis copy
+ e_.properties[i] = property;
+ }
+ }
+ },
+ .e_import => |e_| {
+ const state = TransposeState{
+ .is_await_target = if (p.await_target != null) p.await_target.?.e_import == e_ else false,
+ .is_then_catch_target = e_ == p.then_catch_chain.next_target.e_import and p.then_catch_chain.has_catch,
+ .loc = e_.expr.loc,
+ };
+
+ e_.expr = p.visitExpr(e_.expr);
+ return p.import_transposer.maybeTransposeIf(e_.expr, state);
+
+ // TODO: maybeTransposeIfExprChain
+ },
+ .e_call => |e_| {
+ p.call_target = e_.target.data;
+
+ p.then_catch_chain = ThenCatchChain{
+ .next_target = e_.target.data,
+ .has_multiple_args = e_.args.len >= 2,
+ .has_catch = @as(Expr.Tag, p.then_catch_chain.next_target) == .e_call and p.then_catch_chain.next_target.e_call == e_ and p.then_catch_chain.has_catch,
+ };
+
+ // Prepare to recognize "require.resolve()" calls
+ // const could_be_require_resolve = (e_.args.len == 1 and @as(
+ // Expr.Tag,
+ // e_.target.data,
+ // ) == .e_dot and e_.target.data.e_dot.optional_chain == null and strings.eql(
+ // e_.target.dat.e_dot.name,
+ // "resolve",
+ // ));
+
+ e_.target = p.visitExprInOut(e_.target, ExprIn{
+ .has_chain_parent = (e_.optional_chain orelse js_ast.OptionalChain.start) == .ccontinue,
+ });
+ // TODO: wan about import namespace call
+ var has_spread = false;
+ var i: usize = 0;
+ while (i < e_.args.len) : (i += 1) {
+ e_.args[i] = p.visitExpr(e_.args[i]);
+ has_spread = has_spread or @as(Expr.Tag, e_.args[i].data) == .e_spread;
+ }
+
+ if (e_.optional_chain == null and @as(Expr.Tag, e_.target.data) == .e_identifier and e_.target.data.e_identifier.ref.eql(p.require_ref)) {
+ // Heuristic: omit warnings inside try/catch blocks because presumably
+ // the try/catch statement is there to handle the potential run-time
+ // error from the unbundled require() call failing.
+ if (e_.args.len == 1) {
+ return p.require_transposer.maybeTransposeIf(e_.args[0], null);
+ } else {
+ const r = js_lexer.rangeOfIdentifier(&p.source, e_.target.loc);
+ p.log.addRangeDebug(p.source, r, "This call to \"require\" will not be bundled because it has multiple arguments") catch unreachable;
+ }
+ }
+
+ return expr;
+ },
+ .e_new => |e_| {
+ e_.target = p.visitExpr(e_.target);
+ // p.warnA
+
+ var i: usize = 0;
+ while (i < e_.args.len) : (i += 1) {
+ e_.args[i] = p.visitExpr(e_.args[i]);
+ }
+ },
+ .e_arrow => |e_| {
+ const old_fn_or_arrow_data = p.fn_or_arrow_data_visit;
+ p.fn_or_arrow_data_visit = FnOrArrowDataVisit{
+ .is_arrow = true,
+ .is_async = e_.is_async,
+ };
+ defer p.fn_or_arrow_data_visit = old_fn_or_arrow_data;
+
+ // Mark if we're inside an async arrow function. This value should be true
+ // even if we're inside multiple arrow functions and the closest inclosing
+ // arrow function isn't async, as long as at least one enclosing arrow
+ // function within the current enclosing function is async.
+ const old_inside_async_arrow_fn = p.fn_only_data_visit.is_inside_async_arrow_fn;
+ p.fn_only_data_visit.is_inside_async_arrow_fn = e_.is_async or p.fn_only_data_visit.is_inside_async_arrow_fn;
+ defer p.fn_only_data_visit.is_inside_async_arrow_fn = old_inside_async_arrow_fn;
+
+ p.pushScopeForVisitPass(.function_args, expr.loc) catch unreachable;
+ defer p.popScope();
+
+ p.visitArgs(e_.args, VisitArgsOpts{
+ .has_rest_arg = e_.has_rest_arg,
+ .body = e_.body.stmts,
+ .is_unique_formal_parameters = true,
+ });
+
+ p.pushScopeForVisitPass(.function_body, e_.body.loc) catch unreachable;
+ defer p.popScope();
+
+ var stmts_list = List(Stmt).fromOwnedSlice(p.allocator, e_.body.stmts);
+ var temp_opts = PrependTempRefsOpts{ .kind = StmtsKind.fn_body };
+ p.visitStmtsAndPrependTempRefs(&stmts_list, &temp_opts) catch unreachable;
+ e_.body.stmts = stmts_list.toOwnedSlice();
+ },
+ .e_function => |e_| {
+ p.visitFunc(&e_.func, expr.loc);
+ if (e_.func.name) |name| {
+ return p.keepExprSymbolName(expr, p.symbols.items[name.ref.?.inner_index].original_name);
+ }
+ },
+ .e_class => |e_| {
+ // This might be wrong.
+ _ = p.visitClass(expr.loc, e_);
+ },
+ else => {},
+ }
+ return expr;
+ }
+
+ const VisitArgsOpts = struct {
+ body: []Stmt = &([_]Stmt{}),
+ has_rest_arg: bool = false,
+
+ // This is true if the function is an arrow function or a method
+ is_unique_formal_parameters: bool = false,
+ };
+
+ pub fn visitArgs(p: *P, args: []G.Arg, opts: VisitArgsOpts) void {
+ const strict_loc = fnBodyContainsUseStrict(opts.body);
+ const has_simple_args = isSimpleParameterList(args, opts.has_rest_arg);
+ var duplicate_args_check: ?StringBoolMap = null;
+ // Section 15.2.1 Static Semantics: Early Errors: "It is a Syntax Error if
+ // FunctionBodyContainsUseStrict of FunctionBody is true and
+ // IsSimpleParameterList of FormalParameters is false."
+ if (strict_loc != null and !has_simple_args) {
+ p.log.addRangeError(p.source, p.source.rangeOfString(strict_loc.?), "Cannot use a \"use strict\" directive in a function with a non-simple parameter list") catch unreachable;
+ }
+
+ // Section 15.1.1 Static Semantics: Early Errors: "Multiple occurrences of
+ // the same BindingIdentifier in a FormalParameterList is only allowed for
+ // functions which have simple parameter lists and which are not defined in
+ // strict mode code."
+ if (opts.is_unique_formal_parameters or strict_loc != null or !has_simple_args or p.isStrictMode()) {
+ duplicate_args_check = StringBoolMap.init(p.allocator);
+ }
+
+ var i: usize = 0;
+ var duplicate_args_check_ptr: ?*StringBoolMap = if (duplicate_args_check != null) &duplicate_args_check.? else null;
+
+ while (i < args.len) : (i += 1) {
+ if (args[i].ts_decorators) |decs| {
+ args[i].ts_decorators = p.visitTSDecorators(decs);
+ }
+
+ p.visitBinding(args[i].binding, duplicate_args_check_ptr);
+ if (args[i].default) |default| {
+ args[i].default = p.visitExpr(default);
+ }
+ }
+ }
+
+ pub fn visitTSDecorators(p: *P, decs: ExprNodeList) ExprNodeList {
+ var i: usize = 0;
+ while (i < decs.len) : (i += 1) {
+ decs[i] = p.visitExpr(decs[i]);
+ }
+
+ return decs;
+ }
+
+ pub fn keepExprSymbolName(p: *P, _value: Expr, name: string) Expr {
+ var exprs = p.allocator.alloc(Expr, 2) catch unreachable;
+ exprs[0] = _value;
+ exprs[1] = p.e(E.String{
+ .value = p.lexer.stringToUTF16(name),
+ }, _value.loc);
+ var value = p.callRuntime(_value.loc, "__name", exprs);
+
+ // Make sure tree shaking removes this if the function is never used
+ value.data.e_call.can_be_unwrapped_if_unused = true;
+ return value;
+ }
+
+ pub fn fnBodyContainsUseStrict(body: []Stmt) ?logger.Loc {
+ for (body) |stmt| {
+ switch (stmt.data) {
+ .s_comment => {
+ continue;
+ },
+ .s_directive => |dir| {
+ if (strings.utf16EqlString(dir.value, "use strict")) {
+ return stmt.loc;
+ }
+ },
+ else => {},
+ }
+ }
+
+ return null;
+ }
+
+ pub fn isSimpleParameterList(args: []G.Arg, has_rest_arg: bool) bool {
+ if (has_rest_arg) {
+ return false;
+ }
+
+ for (args) |arg| {
+ if (@as(Binding.Tag, arg.binding.data) != .b_identifier or arg.default != null) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ pub fn classCanBeRemovedIfUnused(p: *P, class: *G.Class) bool {
+ if (class.extends) |extends| {
+ if (!p.exprCanBeRemovedIfUnused(extends)) {
+ return false;
+ }
+ }
+
+ for (class.properties) |property| {
+ if (!p.exprCanBeRemovedIfUnused(property.key orelse unreachable)) {
+ return false;
+ }
+
+ if (property.value) |val| {
+ if (!p.exprCanBeRemovedIfUnused(val)) {
+ return false;
+ }
+ }
+
+ if (property.initializer) |val| {
+ if (!p.exprCanBeRemovedIfUnused(val)) {
+ return false;
+ }
+ }
+ }
+
+ return true;
+ }
+
+ // TODO:
+ // When React Fast Refresh is enabled, anything that's a JSX component should not be removable
+ // This is to improve the reliability of fast refresh between page loads.
+ pub fn exprCanBeRemovedIfUnused(p: *P, expr: Expr) bool {
+ switch (expr.data) {
+ .e_null,
+ .e_undefined,
+ .e_missing,
+ .e_boolean,
+ .e_number,
+ .e_big_int,
+ .e_string,
+ .e_this,
+ .e_reg_exp,
+ .e_function,
+ .e_arrow,
+ .e_import_meta,
+ => {
+ return true;
+ },
+
+ .e_dot => |ex| {
+ return ex.can_be_removed_if_unused;
+ },
+ .e_class => |ex| {
+ return p.classCanBeRemovedIfUnused(ex);
+ },
+ .e_identifier => |ex| {
+ if (ex.must_keep_due_to_with_stmt) {
+ return false;
+ }
+
+ // Unbound identifiers cannot be removed because they can have side effects.
+ // One possible side effect is throwing a ReferenceError if they don't exist.
+ // Another one is a getter with side effects on the global object:
+ //
+ // Object.defineProperty(globalThis, 'x', {
+ // get() {
+ // sideEffect();
+ // },
+ // });
+ //
+ // Be very careful about this possibility. It's tempting to treat all
+ // identifier expressions as not having side effects but that's wrong. We
+ // must make sure they have been declared by the code we are currently
+ // compiling before we can tell that they have no side effects.
+ //
+ // Note that we currently ignore ReferenceErrors due to TDZ access. This is
+ // incorrect but proper TDZ analysis is very complicated and would have to
+ // be very conservative, which would inhibit a lot of optimizations of code
+ // inside closures. This may need to be revisited if it proves problematic.
+ if (ex.can_be_removed_if_unused or p.symbols.items[ex.ref.inner_index].kind != .unbound) {
+ return true;
+ }
+ },
+ .e_import_identifier => |ex| {
+ // References to an ES6 import item are always side-effect free in an
+ // ECMAScript environment.
+ //
+ // They could technically have side effects if the imported module is a
+ // CommonJS module and the import item was translated to a property access
+ // (which esbuild's bundler does) and the property has a getter with side
+ // effects.
+ //
+ // But this is very unlikely and respecting this edge case would mean
+ // disabling tree shaking of all code that references an export from a
+ // CommonJS module. It would also likely violate the expectations of some
+ // developers because the code *looks* like it should be able to be tree
+ // shaken.
+ //
+ // So we deliberately ignore this edge case and always treat import item
+ // references as being side-effect free.
+ return true;
+ },
+ .e_if => |ex| {
+ return p.exprCanBeRemovedIfUnused(ex.test_) and p.exprCanBeRemovedIfUnused(ex.yes) and p.exprCanBeRemovedIfUnused(ex.no);
+ },
+ .e_array => |ex| {
+ for (ex.items) |item| {
+ if (!p.exprCanBeRemovedIfUnused(item)) {
+ return false;
+ }
+ }
+
+ return true;
+ },
+ .e_object => |ex| {
+ for (ex.properties) |property| {
+
+ // The key must still be evaluated if it's computed or a spread
+ if (property.kind == .spread or property.flags.is_computed) {
+ return false;
+ }
+
+ if (property.value) |val| {
+ if (!p.exprCanBeRemovedIfUnused(val)) {
+ return false;
+ }
+ }
+ }
+ return true;
+ },
+ .e_call => |ex| {
+ // A call that has been marked "__PURE__" can be removed if all arguments
+ // can be removed. The annotation causes us to ignore the target.
+ if (ex.can_be_unwrapped_if_unused) {
+ for (ex.args) |arg| {
+ if (!p.exprCanBeRemovedIfUnused(arg)) {
+ return false;
+ }
+ }
+ }
+
+ return true;
+ },
+ .e_new => |ex| {
+ // A call that has been marked "__PURE__" can be removed if all arguments
+ // can be removed. The annotation causes us to ignore the target.
+ if (ex.can_be_unwrapped_if_unused) {
+ for (ex.args) |arg| {
+ if (!p.exprCanBeRemovedIfUnused(arg)) {
+ return false;
+ }
+ }
+ }
+
+ return true;
+ },
+ .e_unary => |ex| {
+ switch (ex.op) {
+ .un_typeof, .un_void, .un_not => {
+ return p.exprCanBeRemovedIfUnused(ex.value);
+ },
+ else => {},
+ }
+ },
+ .e_binary => |ex| {
+ switch (ex.op) {
+ .bin_strict_eq, .bin_strict_ne, .bin_comma, .bin_logical_or, .bin_logical_and, .bin_nullish_coalescing => {
+ return p.exprCanBeRemovedIfUnused(ex.left) and p.exprCanBeRemovedIfUnused(ex.right);
+ },
+ else => {},
+ }
+ },
+ else => {},
+ }
+
+ return false;
+ }
+
+ // EDot nodes represent a property access. This function may return an
+ // expression to replace the property access with. It assumes that the
+ // target of the EDot expression has already been visited.
+ pub fn maybeRewritePropertyAccess(
+ p: *P,
+ loc: logger.Loc,
+ assign_target: js_ast.AssignTarget,
+ is_delete_target: bool,
+ target: js_ast.Expr,
+ name: string,
+ name_loc: logger.Loc,
+ is_call_target: bool,
+ ) ?Expr {
+ if (@as(Expr.Tag, target.data) == .e_identifier) {
+ const id = target.data.e_identifier;
+
+ // Rewrite property accesses on explicit namespace imports as an identifier.
+ // This lets us replace them easily in the printer to rebind them to
+ // something else without paying the cost of a whole-tree traversal during
+ // module linking just to rewrite these EDot expressions.
+ if (p.import_items_for_namespace.get(id.ref)) |*import_items| {
+ var item: LocRef = undefined;
+
+ if (!import_items.contains(name)) {
+ item = LocRef{ .loc = name_loc, .ref = p.newSymbol(.import, name) catch unreachable };
+ p.module_scope.generated.append(item.ref orelse unreachable) catch unreachable;
+
+ import_items.put(name, item) catch unreachable;
+ p.is_import_item.put(item.ref orelse unreachable, true) catch unreachable;
+
+ var symbol = p.symbols.items[item.ref.?.inner_index];
+ // Mark this as generated in case it's missing. We don't want to
+ // generate errors for missing import items that are automatically
+ // generated.
+ symbol.import_item_status = .generated;
+ } else {
+ item = import_items.get(name) orelse unreachable;
+ }
+
+ // Undo the usage count for the namespace itself. This is used later
+ // to detect whether the namespace symbol has ever been "captured"
+ // or whether it has just been used to read properties off of.
+ //
+ // The benefit of doing this is that if both this module and the
+ // imported module end up in the same module group and the namespace
+ // symbol has never been captured, then we don't need to generate
+ // any code for the namespace at all.
+ p.ignoreUsage(id.ref);
+
+ // Track how many times we've referenced this symbol
+ p.recordUsage(&item.ref.?);
+ var ident = p.allocator.create(E.Identifier) catch unreachable;
+ ident.ref = item.ref.?;
+
+ return p.handleIdentifier(name_loc, ident, name, IdentifierOpts{
+ .assign_target = assign_target,
+ .is_delete_target = is_delete_target,
+ // If this expression is used as the target of a call expression, make
+ // sure the value of "this" is preserved.
+ .was_originally_identifier = false,
+ });
+ }
+
+ if (is_call_target and id.ref.eql(p.module_ref) and strings.eql(name, "require")) {
+ p.ignoreUsage(p.module_ref);
+ p.recordUsage(&p.require_ref);
+ return p.e(E.Identifier{ .ref = p.require_ref }, name_loc);
+ }
+
+ // If this is a known enum value, inline the value of the enum
+ if (p.options.ts) {
+ if (p.known_enum_values.get(id.ref)) |enum_value_map| {
+ if (enum_value_map.get(name)) |enum_value| {
+ return p.e(E.Number{ .value = enum_value }, loc);
+ }
+ }
+ }
+ }
+
+ return null;
+ }
+
+ pub fn ignoreUsage(p: *P, ref: Ref) void {
+ if (!p.is_control_flow_dead) {
+ p.symbols.items[ref.inner_index].use_count_estimate = std.math.max(p.symbols.items[ref.inner_index].use_count_estimate - 1, 0);
+ var use = p.symbol_uses.get(ref) orelse p.panic("Expected symbol_uses to exist {s}\n{s}", .{ ref, p.symbol_uses });
+ use.count_estimate = std.math.max(use.count_estimate - 1, 0);
+ if (use.count_estimate == 0) {
+ _ = p.symbol_uses.remove(ref);
+ } else {
+ p.symbol_uses.putAssumeCapacity(ref, use);
+ }
+ }
+
+ // Don't roll back the "tsUseCounts" increment. This must be counted even if
+ // the value is ignored because that's what the TypeScript compiler does.
+ }
+
+ pub fn visitAndAppendStmt(p: *P, stmts: *List(Stmt), stmt: *Stmt) !void {
+ switch (stmt.data) {
+ // These don't contain anything to traverse
+
+ .s_debugger, .s_empty, .s_comment => {},
+ .s_type_script => |data| {
+ // Erase TypeScript constructs from the output completely
+ return;
+ },
+ .s_directive => |data| {
+ // if p.isStrictMode() && s.LegacyOctalLoc.Start > 0 {
+ // p.markStrictModeFeature(legacyOctalEscape, p.source.RangeOfLegacyOctalEscape(s.LegacyOctalLoc), "")
+ // }
+ return;
+ },
+ .s_import => |data| {
+ try p.recordDeclaredSymbol(data.namespace_ref);
+
+ if (data.default_name) |default_name| {
+ try p.recordDeclaredSymbol(default_name.ref orelse unreachable);
+ }
+
+ if (data.items.len > 0) {
+ for (data.items) |*item| {
+ try p.recordDeclaredSymbol(item.name.ref orelse unreachable);
+ }
+ }
+ },
+ .s_export_clause => |data| {
+ // "export {foo}"
+ var end: usize = 0;
+ for (data.items) |*item| {
+ const name = p.loadNameFromRef(item.name.ref orelse unreachable);
+ const symbol = try p.findSymbol(item.alias_loc, name);
+ const ref = symbol.ref;
+
+ if (p.symbols.items[ref.inner_index].kind == .unbound) {
+ // Silently strip exports of non-local symbols in TypeScript, since
+ // those likely correspond to type-only exports. But report exports of
+ // non-local symbols as errors in JavaScript.
+ if (!p.options.ts) {
+ const r = js_lexer.rangeOfIdentifier(&p.source, item.name.loc);
+ try p.log.addRangeErrorFmt(p.source, r, p.allocator, "\"{s}\" is not declared in this file", .{name});
+ continue;
+ }
+ continue;
+ }
+
+ item.name.ref = ref;
+ data.items[end] = item.*;
+ end += 1;
+ }
+ // esbuild: "Note: do not remove empty export statements since TypeScript uses them as module markers"
+ // jarred: does that mean we can remove them here, since we're not bundling for production?
+ data.items = data.items[0..end];
+ },
+ .s_export_from => |data| {
+ // "export {foo} from 'path'"
+ const name = p.loadNameFromRef(data.namespace_ref);
+ data.namespace_ref = try p.newSymbol(.other, name);
+ try p.current_scope.generated.append(data.namespace_ref);
+ try p.recordDeclaredSymbol(data.namespace_ref);
+
+ // This is a re-export and the symbols created here are used to reference
+ for (data.items) |*item| {
+ const _name = p.loadNameFromRef(item.name.ref orelse unreachable);
+ const ref = try p.newSymbol(.other, _name);
+ try p.current_scope.generated.append(data.namespace_ref);
+ try p.recordDeclaredSymbol(data.namespace_ref);
+ item.name.ref = ref;
+ }
+ },
+ .s_export_star => |data| {
+ // "export {foo} from 'path'"
+ const name = p.loadNameFromRef(data.namespace_ref);
+ data.namespace_ref = try p.newSymbol(.other, name);
+ try p.current_scope.generated.append(data.namespace_ref);
+ try p.recordDeclaredSymbol(data.namespace_ref);
+
+ // "export * as ns from 'path'"
+ if (data.alias) |alias| {
+ // "import * as ns from 'path'"
+ // "export {ns}"
+
+ // jarred: For now, just always do this transform.
+ // because Safari doesn't support it and I've seen cases where this breaks
+ // TODO: backport unsupportedJSFeatures map
+ p.recordUsage(&data.namespace_ref);
+ try stmts.ensureCapacity(stmts.items.len + 2);
+ stmts.appendAssumeCapacity(p.s(S.Import{ .namespace_ref = data.namespace_ref, .star_name_loc = alias.loc, .import_record_index = data.import_record_index }, stmt.loc));
+
+ var items = try List(js_ast.ClauseItem).initCapacity(p.allocator, 1);
+ items.appendAssumeCapacity(js_ast.ClauseItem{ .alias = alias.original_name, .original_name = alias.original_name, .alias_loc = alias.loc, .name = LocRef{ .loc = alias.loc, .ref = data.namespace_ref } });
+ stmts.appendAssumeCapacity(p.s(S.ExportClause{ .items = items.toOwnedSlice(), .is_single_line = true }, stmt.loc));
+ }
+ },
+ .s_export_default => |data| {
+ try p.recordDeclaredSymbol(data.default_name.ref orelse unreachable);
+
+ switch (data.value) {
+ .expr => |*expr| {
+ const was_anonymous_named_expr = expr.isAnonymousNamed();
+ data.value.expr = p.visitExpr(expr.*);
+
+ // // Optionally preserve the name
+ data.value.expr = p.maybeKeepExprSymbolName(expr.*, "default", was_anonymous_named_expr);
+
+ // Discard type-only export default statements
+ if (p.options.ts) {
+ switch (expr.data) {
+ .e_identifier => |ident| {
+ const symbol = p.symbols.items[ident.ref.inner_index];
+ if (symbol.kind == .unbound) {
+ if (p.local_type_names.get(symbol.original_name)) |local_type| {
+ if (local_type) {
+ return;
+ }
+ }
+ }
+ },
+ else => {},
+ }
+ }
+ },
+
+ .stmt => |s2| {
+ switch (s2.data) {
+ .s_function => |func| {
+ var name: string = undefined;
+ if (func.func.name) |func_loc| {
+ name = p.symbols.items[func_loc.ref.?.inner_index].original_name;
+ } else {
+ func.func.name = data.default_name;
+ name = "default";
+ }
+
+ p.visitFunc(&func.func, func.func.open_parens_loc);
+ stmts.append(stmt.*) catch unreachable;
+
+ if (func.func.name) |name_ref| {
+ // TODO-REACT-REFRESH-SPOT
+ stmts.append(p.keepStmtSymbolName(name_ref.loc, name_ref.ref.?, name)) catch unreachable;
+ }
+ },
+ .s_class => |class| {
+ var shadow_ref = p.visitClass(s2.loc, &class.class);
+ stmts.appendSlice(p.lowerClass(js_ast.StmtOrExpr{ .stmt = stmt.* }, shadow_ref)) catch unreachable;
+ },
+ else => {},
+ }
+ },
+ }
+ },
+ .s_export_equals => |data| {
+ // "module.exports = value"
+ stmts.append(
+ Expr.assignStmt(
+ p.e(
+ E.Dot{
+ .target = p.e(
+ E.Identifier{
+ .ref = p.module_ref,
+ },
+ stmt.loc,
+ ),
+ .name = "exports",
+ .name_loc = stmt.loc,
+ },
+ stmt.loc,
+ ),
+ p.visitExpr(data.value),
+ p.allocator,
+ ),
+ ) catch unreachable;
+ p.recordUsage(&p.module_ref);
+ },
+ .s_break => |data| {
+ if (data.label) |*label| {
+ const name = p.loadNameFromRef(label.ref orelse p.panic("Expected label to have a ref", .{}));
+ const res = p.findLabelSymbol(label.loc, name);
+
+ label.ref = res.ref;
+ } else if (p.fn_or_arrow_data_visit.is_inside_loop and !p.fn_or_arrow_data_visit.is_inside_switch) {
+ const r = js_lexer.rangeOfIdentifier(&p.source, stmt.loc);
+ p.log.addRangeError(p.source, r, "Cannot use \"break\" here") catch unreachable;
+ }
+ },
+ .s_continue => |data| {
+ if (data.label) |*label| {
+ const name = p.loadNameFromRef(label.ref orelse p.panic("Expected continue label to have a ref", .{}));
+ const res = p.findLabelSymbol(label.loc, name);
+ label.ref = res.ref;
+ if (res.found and !res.is_loop) {
+ const r = js_lexer.rangeOfIdentifier(&p.source, stmt.loc);
+ p.log.addRangeErrorFmt(p.source, r, p.allocator, "Cannot \"continue\" to label {s}", .{name}) catch unreachable;
+ }
+ } else if (!p.fn_or_arrow_data_visit.is_inside_loop) {
+ const r = js_lexer.rangeOfIdentifier(&p.source, stmt.loc);
+ p.log.addRangeError(p.source, r, "Cannot use \"continue\" here") catch unreachable;
+ }
+ },
+ .s_label => |data| {
+ p.pushScopeForVisitPass(.label, stmt.loc) catch unreachable;
+ const name = p.loadNameFromRef(data.name.ref orelse unreachable);
+ const ref = p.newSymbol(.label, name) catch unreachable;
+ data.name.ref = ref;
+ p.current_scope.label_ref = ref;
+ switch (data.stmt.data) {
+ .s_for, .s_for_in, .s_for_of, .s_while, .s_do_while => {
+ p.current_scope.label_stmt_is_loop = true;
+ },
+ else => {},
+ }
+
+ data.stmt = p.visitSingleStmt(data.stmt, StmtsKind.none);
+ p.popScope();
+ },
+ .s_local => |data| {
+ for (data.decls) |*d| {
+ p.visitBinding(d.binding, null);
+
+ if (d.value != null) {
+ var val = d.value orelse unreachable;
+ const was_anonymous_named_expr = p.isAnonymousNamedExpr(val);
+
+ val = p.visitExpr(val);
+ // go version of defer would cause this to reset the variable
+ // zig version of defer causes this to set it to the last value of val, at the end of the scope.
+ defer d.value = val;
+
+ // Optionally preserve the name
+ switch (d.binding.data) {
+ .b_identifier => |id| {
+ val = p.maybeKeepExprSymbolName(
+ val,
+ p.symbols.items[id.ref.inner_index].original_name,
+ was_anonymous_named_expr,
+ );
+ },
+ else => {},
+ }
+ }
+ }
+
+ // Handle being exported inside a namespace
+ if (data.is_export and p.enclosing_namespace_arg_ref != null) {
+ for (data.decls) |*d| {
+ if (d.value) |val| {
+ p.recordUsage(&(p.enclosing_namespace_arg_ref orelse unreachable));
+ // TODO: is it necessary to lowerAssign? why does esbuild do it _most_ of the time?
+ stmts.append(p.s(S.SExpr{
+ .value = Expr.assign(Binding.toExpr(&d.binding, p.to_expr_wrapper_namespace), val, p.allocator),
+ }, stmt.loc)) catch unreachable;
+ }
+ }
+
+ return;
+ }
+
+ // TODO: do we need to relocate vars? I don't think so.
+ if (data.kind == .k_var) {}
+ },
+ .s_expr => |data| {
+ p.stmt_expr_value = data.value.data;
+ data.value = p.visitExpr(data.value);
+
+ // TODO:
+ // if (p.options.mangle_syntax) {
+
+ // }
+ },
+ .s_throw => |data| {
+ data.value = p.visitExpr(data.value);
+ },
+ .s_return => |data| {
+ if (p.fn_or_arrow_data_visit.is_outside_fn_or_arrow) {
+ const where = where: {
+ if (p.es6_export_keyword.len > 0) {
+ break :where p.es6_export_keyword;
+ } else if (p.top_level_await_keyword.len > 0) {
+ break :where p.top_level_await_keyword;
+ } else {
+ break :where logger.Range.None;
+ }
+ };
+
+ if (where.len > 0) {
+ p.log.addRangeError(p.source, where, "Top-level return cannot be used inside an ECMAScript module") catch unreachable;
+ }
+ }
+
+ if (data.value) |val| {
+ data.value = p.visitExpr(val);
+
+ // "return undefined;" can safely just always be "return;"
+ if (data.value != null and @as(Expr.Tag, data.value.?.data) == .e_undefined) {
+ // Returning undefined is implicit
+ data.value = null;
+ }
+ }
+ },
+ .s_block => |data| {
+ {
+ p.pushScopeForVisitPass(.block, stmt.loc) catch unreachable;
+ defer p.popScope();
+
+ // Pass the "is loop body" status on to the direct children of a block used
+ // as a loop body. This is used to enable optimizations specific to the
+ // topmost scope in a loop body block.
+ const kind = if (std.meta.eql(p.loop_body, stmt.data)) StmtsKind.loop_body else StmtsKind.none;
+ var _stmts = List(Stmt).init(p.allocator);
+ p.visitStmts(&_stmts, kind) catch unreachable;
+ data.stmts = _stmts.toOwnedSlice();
+ }
+
+ // trim empty statements
+ if (data.stmts.len == 0) {
+ stmts.append(p.s(S.Empty{}, stmt.loc)) catch unreachable;
+ return;
+ } else if (data.stmts.len == 1 and !statementCaresAboutScope(data.stmts[0])) {
+ // Unwrap blocks containing a single statement
+ stmts.append(data.stmts[0]) catch unreachable;
+ return;
+ }
+ },
+ .s_with => |data| {
+ notimpl();
+ },
+ .s_while => |data| {
+ data.test_ = p.visitExpr(data.test_);
+ data.body = p.visitLoopBody(data.body);
+
+ // TODO: simplify boolean expression
+ },
+ .s_do_while => |data| {
+ data.test_ = p.visitExpr(data.test_);
+ data.body = p.visitLoopBody(data.body);
+
+ // TODO: simplify boolean expression
+ },
+ .s_if => |data| {
+ data.test_ = p.visitExpr(data.test_);
+
+ const effects = SideEffects.toBoolean(data.test_.data);
+ if (effects.ok and !effects.value) {
+ const old = p.is_control_flow_dead;
+ defer p.is_control_flow_dead = old;
+ p.is_control_flow_dead = true;
+ data.yes = p.visitSingleStmt(data.yes, StmtsKind.none);
+ } else {
+ data.yes = p.visitSingleStmt(data.yes, StmtsKind.none);
+ }
+ },
+ .s_for => |data| {
+ {
+ p.pushScopeForVisitPass(.block, stmt.loc) catch unreachable;
+ defer p.popScope();
+ if (data.init) |initst| {
+ _ = p.visitForLoopInit(initst, false);
+ }
+
+ if (data.test_) |test_| {
+ data.test_ = p.visitExpr(test_);
+
+ // TODO: boolean with side effects
+ }
+
+ if (data.update) |update| {
+ data.update = p.visitExpr(update);
+ }
+
+ data.body = p.visitLoopBody(data.body);
+ }
+ // TODO: Potentially relocate "var" declarations to the top level
+
+ },
+ .s_for_in => |data| {
+ {
+ p.pushScopeForVisitPass(.block, stmt.loc) catch unreachable;
+ defer p.popScope();
+ _ = p.visitForLoopInit(data.init, true);
+ data.value = p.visitExpr(data.value);
+ data.body = p.visitLoopBody(data.body);
+
+ // TODO: do we need to this?
+ // // Check for a variable initializer
+ // if local, ok := s.Init.Data.(*js_ast.SLocal); ok && local.Kind == js_ast.LocalVar && len(local.Decls) == 1 {
+ // decl := &local.Decls[0]
+ // if id, ok := decl.Binding.Data.(*js_ast.BIdentifier); ok && decl.Value != nil {
+ // p.markStrictModeFeature(forInVarInit, p.source.RangeOfOperatorBefore(decl.Value.Loc, "="), "")
+
+ // // Lower for-in variable initializers in case the output is used in strict mode
+ // stmts = append(stmts, js_ast.Stmt{Loc: stmt.Loc, Data: &js_ast.SExpr{Value: js_ast.Assign(
+ // js_ast.Expr{Loc: decl.Binding.Loc, Data: &js_ast.EIdentifier{Ref: id.Ref}},
+ // *decl.Value,
+ // )}})
+ // decl.Value = nil
+ // }
+ // }
+ }
+ },
+ .s_for_of => |data| {
+ p.pushScopeForVisitPass(.block, stmt.loc) catch unreachable;
+ defer p.popScope();
+ _ = p.visitForLoopInit(data.init, true);
+ data.value = p.visitExpr(data.value);
+ data.body = p.visitLoopBody(data.body);
+
+ // TODO: do we need to do this?
+ // // Potentially relocate "var" declarations to the top level
+ // if init, ok := s.Init.Data.(*js_ast.SLocal); ok && init.Kind == js_ast.LocalVar {
+ // if replacement, ok := p.maybeRelocateVarsToTopLevel(init.Decls, relocateVarsForInOrForOf); ok {
+ // s.Init = replacement
+ // }
+ // }
+
+ // p.lowerObjectRestInForLoopInit(s.Init, &s.Body)
+ },
+ .s_try => |data| {
+ {
+ p.pushScopeForVisitPass(.block, stmt.loc) catch unreachable;
+ defer p.popScope();
+ p.fn_or_arrow_data_visit.try_body_count += 1;
+ defer p.fn_or_arrow_data_visit.try_body_count -= 1;
+ var _stmts = List(Stmt).fromOwnedSlice(p.allocator, data.body);
+ p.visitStmts(&_stmts, StmtsKind.none) catch unreachable;
+ data.body = _stmts.toOwnedSlice();
+ }
+
+ if (data.catch_) |*catch_| {
+ p.pushScopeForVisitPass(.block, catch_.loc) catch unreachable;
+ defer p.popScope();
+ var _stmts = List(Stmt).fromOwnedSlice(p.allocator, data.body);
+ p.visitStmts(&_stmts, StmtsKind.none) catch unreachable;
+ catch_.body = _stmts.toOwnedSlice();
+ }
+
+ if (data.finally) |*finally| {
+ p.pushScopeForVisitPass(.block, finally.loc) catch unreachable;
+ var _stmts = List(Stmt).fromOwnedSlice(p.allocator, data.body);
+ p.visitStmts(&_stmts, StmtsKind.none) catch unreachable;
+ finally.stmts = _stmts.toOwnedSlice();
+ p.popScope();
+ }
+ },
+ .s_switch => |data| {
+ data.test_ = p.visitExpr(data.test_);
+ {
+ p.pushScopeForVisitPass(.block, data.body_loc) catch unreachable;
+ defer p.popScope();
+ var old_is_inside_Swsitch = p.fn_or_arrow_data_visit.is_inside_switch;
+ p.fn_or_arrow_data_visit.is_inside_switch = true;
+ defer p.fn_or_arrow_data_visit.is_inside_switch = old_is_inside_Swsitch;
+ var i: usize = 0;
+ while (i < data.cases.len) : (i += 1) {
+ const case = data.cases[i];
+ if (case.value) |val| {
+ data.cases[i].value = p.visitExpr(val);
+ // TODO: error messages
+ // Check("case", *c.Value, c.Value.Loc)
+ // p.warnAboutTypeofAndString(s.Test, *c.Value)
+ }
+ var _stmts = List(Stmt).fromOwnedSlice(p.allocator, case.body);
+ p.visitStmts(&_stmts, StmtsKind.none) catch unreachable;
+ data.cases[i].body = _stmts.toOwnedSlice();
+ }
+ }
+ // TODO: duplicate case checker
+
+ },
+ .s_function => |data| {
+ p.visitFunc(&data.func, data.func.open_parens_loc);
+
+ // Handle exporting this function from a namespace
+ if (data.func.flags.is_export and p.enclosing_namespace_arg_ref != null) {
+ const enclosing_namespace_arg_ref = p.enclosing_namespace_arg_ref orelse unreachable;
+ stmts.ensureUnusedCapacity(3) catch unreachable;
+ stmts.appendAssumeCapacity(stmt.*);
+ // i wonder if this will crash
+ stmts.appendAssumeCapacity(Expr.assignStmt(p.e(E.Dot{
+ .target = p.e(E.Identifier{ .ref = enclosing_namespace_arg_ref }, stmt.loc),
+ .name = p.symbols.items[data.func.name.?.ref.?.inner_index].original_name,
+ .name_loc = data.func.name.?.loc,
+ }, stmt.loc), p.e(E.Identifier{ .ref = data.func.name.?.ref.? }, data.func.name.?.loc), p.allocator));
+ } else {
+ stmts.ensureUnusedCapacity(2) catch unreachable;
+ stmts.appendAssumeCapacity(stmt.*);
+ }
+
+ stmts.appendAssumeCapacity(
+ // i wonder if this will crash
+ p.keepStmtSymbolName(
+ data.func.name.?.loc,
+ data.func.name.?.ref.?,
+ p.symbols.items[data.func.name.?.ref.?.inner_index].original_name,
+ ),
+ );
+ return;
+ },
+ .s_class => |data| {
+ const shadow_ref = p.visitClass(stmt.loc, &data.class);
+
+ // Remove the export flag inside a namespace
+ const was_export_inside_namespace = data.is_export and p.enclosing_namespace_arg_ref != null;
+ if (was_export_inside_namespace) {
+ data.is_export = false;
+ }
+
+ // Lower class field syntax for browsers that don't support it
+ stmts.appendSlice(p.lowerClass(js_ast.StmtOrExpr{ .stmt = stmt.* }, shadow_ref)) catch unreachable;
+
+ // Handle exporting this class from a namespace
+ if (was_export_inside_namespace) {
+ stmts.appendAssumeCapacity(Expr.assignStmt(p.e(E.Dot{
+ .target = p.e(E.Identifier{ .ref = p.enclosing_namespace_arg_ref.? }, stmt.loc),
+ .name = p.symbols.items[data.class.class_name.?.ref.?.inner_index].original_name,
+ .name_loc = data.class.class_name.?.loc,
+ }, stmt.loc), p.e(E.Identifier{ .ref = data.class.class_name.?.ref.? }, data.class.class_name.?.loc), p.allocator));
+ }
+
+ return;
+ },
+ .s_enum => |data| {
+ p.recordDeclaredSymbol(data.name.ref.?) catch unreachable;
+ p.pushScopeForVisitPass(.entry, stmt.loc) catch unreachable;
+ defer p.popScope();
+ p.recordDeclaredSymbol(data.arg) catch unreachable;
+
+ // Scan ahead for any variables inside this namespace. This must be done
+ // ahead of time before visiting any statements inside the namespace
+ // because we may end up visiting the uses before the declarations.
+ // We need to convert the uses into property accesses on the namespace.
+ for (data.values) |value| {
+ if (!value.ref.isNull()) {
+ p.is_exported_inside_namespace.put(value.ref, data.arg) catch unreachable;
+ }
+ }
+
+ // Values without initializers are initialized to one more than the
+ // previous value if the previous value is numeric. Otherwise values
+ // without initializers are initialized to undefined.
+ var next_numeric_value: f64 = 0.0;
+ var has_numeric_value = true;
+ var value_exprs = List(Expr).initCapacity(p.allocator, data.values.len) catch unreachable;
+
+ // Track values so they can be used by constant folding. We need to follow
+ // links here in case the enum was merged with a preceding namespace
+ var values_so_far = std.StringHashMap(f64).init(p.allocator);
+ p.known_enum_values.put(data.name.ref orelse p.panic("Expected data.name.ref", .{}), values_so_far) catch unreachable;
+ p.known_enum_values.put(data.arg, values_so_far) catch unreachable;
+
+ // We normally don't fold numeric constants because they might increase code
+ // size, but it's important to fold numeric constants inside enums since
+ // that's what the TypeScript compiler does.
+ const old_should_fold_numeric_constants = p.should_fold_numeric_constants;
+ p.should_fold_numeric_constants = true;
+ defer p.should_fold_numeric_constants = old_should_fold_numeric_constants;
+ for (data.values) |*enum_value| {
+ // gotta allocate here so it lives after this function stack frame goes poof
+ const name = p.lexer.utf16ToString(enum_value.name);
+ var assign_target: Expr = undefined;
+ var enum_value_type: EnumValueType = EnumValueType.unknown;
+ if (enum_value.value != null) {
+ enum_value.value = p.visitExpr(enum_value.value.?);
+ switch (enum_value.value.?.data) {
+ .e_number => |num| {
+ values_so_far.put(name, num.value) catch unreachable;
+ enum_value_type = .numeric;
+ next_numeric_value = num.value + 1.0;
+ },
+ .e_string => |str| {
+ enum_value_type = .string;
+ },
+ else => {},
+ }
+ } else if (enum_value_type == .numeric) {
+ enum_value.value = p.e(E.Number{ .value = next_numeric_value }, enum_value.loc);
+ values_so_far.put(name, next_numeric_value) catch unreachable;
+ next_numeric_value += 1;
+ } else {
+ enum_value.value = p.e(E.Undefined{}, enum_value.loc);
+ }
+ // "Enum['Name'] = value"
+
+ assign_target = Expr.assign(p.e(E.Index{
+ .target = p.e(
+ E.Identifier{ .ref = data.arg },
+ enum_value.loc,
+ ),
+ .index = p.e(
+ E.String{ .value = enum_value.name },
+ enum_value.loc,
+ ),
+ }, enum_value.loc), enum_value.value orelse unreachable, p.allocator);
+
+ p.recordUsage(&data.arg);
+
+ // String-valued enums do not form a two-way map
+ if (enum_value_type == .string) {
+ value_exprs.append(assign_target) catch unreachable;
+ } else {
+ // "Enum[assignTarget] = 'Name'"
+ value_exprs.append(Expr.assign(p.e(E.Index{
+ .target = p.e(
+ E.Identifier{ .ref = data.arg },
+ enum_value.loc,
+ ),
+ .index = assign_target,
+ }, enum_value.loc), p.e(E.String{ .value = enum_value.name }, enum_value.loc), p.allocator)) catch unreachable;
+ }
+ }
+ p.recordUsage(&data.arg);
+
+ var value_stmts = List(Stmt).initCapacity(p.allocator, value_exprs.items.len) catch unreachable;
+ // Generate statements from expressions
+
+ for (value_exprs.items) |expr| {
+ value_stmts.appendAssumeCapacity(p.s(S.SExpr{ .value = expr }, expr.loc));
+ }
+ value_exprs.deinit();
+ p.generateClosureForTypescriptNameSpaceOrEnum(
+ stmts,
+ stmt.loc,
+ data.is_export,
+ data.name.loc,
+ data.name.ref.?,
+ data.arg,
+ value_stmts.toOwnedSlice(),
+ );
+ return;
+ },
+ .s_namespace => |data| {
+ p.recordDeclaredSymbol(data.name.ref.?) catch unreachable;
+
+ // Scan ahead for any variables inside this namespace. This must be done
+ // ahead of time before visiting any statements inside the namespace
+ // because we may end up visiting the uses before the declarations.
+ // We need to convert the uses into property accesses on the namespace.
+ for (data.stmts) |child_stmt| {
+ switch (child_stmt.data) {
+ .s_local => |local| {
+ if (local.is_export) {
+ p.markExportedDeclsInsideNamespace(data.arg, local.decls);
+ }
+ },
+ else => {},
+ }
+ }
+
+ var prepend_temp_refs = PrependTempRefsOpts{ .kind = StmtsKind.fn_body };
+ var prepend_list = List(Stmt).fromOwnedSlice(p.allocator, data.stmts);
+
+ {
+ const old_enclosing_namespace_arg_ref = p.enclosing_namespace_arg_ref;
+ p.enclosing_namespace_arg_ref = data.arg;
+ defer p.enclosing_namespace_arg_ref = old_enclosing_namespace_arg_ref;
+ p.pushScopeForVisitPass(.entry, stmt.loc) catch unreachable;
+ defer p.popScope();
+ p.recordDeclaredSymbol(data.arg) catch unreachable;
+ p.visitStmtsAndPrependTempRefs(&prepend_list, &prepend_temp_refs) catch unreachable;
+ }
+
+ p.generateClosureForTypescriptNameSpaceOrEnum(
+ stmts,
+ stmt.loc,
+ data.is_export,
+ data.name.loc,
+ data.name.ref.?,
+ data.arg,
+ prepend_list.toOwnedSlice(),
+ );
+ return;
+ },
+ else => {
+ notimpl();
+ },
+ }
+
+ // if we get this far, it stays
+ try stmts.append(stmt.*);
+ }
+
+ pub fn markExportedDeclsInsideNamespace(p: *P, ns_ref: Ref, decls: []G.Decl) void {
+ notimpl();
+ }
+
+ pub fn generateClosureForTypescriptNameSpaceOrEnum(
+ p: *P,
+ stmts: *List(Stmt),
+ stmt_loc: logger.Loc,
+ is_export: bool,
+ name_loc: logger.Loc,
+ name_ref: Ref,
+ arg_ref: Ref,
+ stmts_inside_closure: []Stmt,
+ ) void {
+ notimpl();
+ }
+
+ pub fn lowerClass(p: *P, stmtorexpr: js_ast.StmtOrExpr, ref: Ref) []Stmt {
+ switch (stmtorexpr) {
+ .stmt => |stmt| {
+ var stmts = p.allocator.alloc(Stmt, 1) catch unreachable;
+ stmts[0] = stmt;
+ return stmts;
+ },
+ .expr => |expr| {
+ var stmts = p.allocator.alloc(Stmt, 1) catch unreachable;
+ stmts[0] = p.s(S.SExpr{ .value = expr }, expr.loc);
+ return stmts;
+ },
+ }
+ }
+
+ pub fn visitForLoopInit(p: *P, stmt: Stmt, is_in_or_of: bool) Stmt {
+ switch (stmt.data) {
+ .s_expr => |st| {
+ const assign_target = if (is_in_or_of) js_ast.AssignTarget.replace else js_ast.AssignTarget.none;
+ p.stmt_expr_value = st.value.data;
+ st.value = p.visitExprInOut(st.value, ExprIn{ .assign_target = assign_target });
+ },
+ .s_local => |st| {
+ for (st.decls) |*dec| {
+ p.visitBinding(dec.binding, null);
+ if (dec.value) |val| {
+ dec.value = p.visitExpr(val);
+ }
+ }
+ // s.Decls = p.lowerObjectRestInDecls(s.Decls)
+ // s.Kind = p.selectLocalKind(s.Kind)
+ },
+ else => {
+ p.panic("Unexpected stmt in visitForLoopInit: {s}", .{stmt});
+ },
+ }
+
+ return stmt;
+ }
+
+ // pub fn maybeRelocateVarsToTopLevel(p: *P, decls: []G.Decl, mode: )
+
+ pub fn wrapIdentifierNamespace(
+ p: *P,
+ loc: logger.Loc,
+ ref: Ref,
+ ) Expr {
+ p.recordUsage(&(p.enclosing_namespace_arg_ref orelse unreachable));
+
+ return p.e(E.Dot{
+ .target = p.e(E.Identifier{ .ref = p.enclosing_namespace_arg_ref orelse unreachable }, loc),
+ .name = p.symbols.items[ref.inner_index].original_name,
+ .name_loc = loc,
+ }, loc);
+ }
+
+ pub fn wrapIdentifierHoisting(
+ p: *P,
+ loc: logger.Loc,
+ ref: Ref,
+ ) Expr {
+ p.relocated_top_level_vars.append(LocRef{ .loc = loc, .ref = ref }) catch unreachable;
+ var _ref = ref;
+ p.recordUsage(&_ref);
+ return p.e(E.Identifier{ .ref = _ref }, loc);
+ }
+
+ pub fn isAnonymousNamedExpr(p: *P, expr: ExprNodeIndex) bool {
+ switch (expr.data) {
+ .e_arrow => {
+ return true;
+ },
+ .e_function => |func| {
+ return func.func.name == null;
+ },
+ .e_class => |class| {
+ return class.class_name == null;
+ },
+ else => {
+ return false;
+ },
+ }
+ }
+
+ pub fn valueForDefine(p: *P, loc: logger.Loc, assign_target: js_ast.AssignTarget, is_delete_target: bool, define_data: *const DefineData) Expr {
+ switch (define_data.value) {
+ .e_identifier => |ident| {
+ return p.handleIdentifier(
+ loc,
+ ident,
+ define_data.original_name.?,
+ IdentifierOpts{
+ .assign_target = assign_target,
+ .is_delete_target = is_delete_target,
+ .was_originally_identifier = true,
+ },
+ );
+ },
+ else => {},
+ }
+
+ return Expr{
+ .data = define_data.value,
+ .loc = loc,
+ };
+ }
+
+ pub fn isDotDefineMatch(p: *P, expr: Expr, parts: []const string) bool {
+ switch (expr.data) {
+ .e_dot => |ex| {
+ if (parts.len > 1) {
+ // Intermediates must be dot expressions
+ const last = parts.len - 1;
+ return strings.eql(parts[last], ex.name) and ex.optional_chain == null and p.isDotDefineMatch(ex.target, parts[0..last]);
+ }
+ },
+ .e_import_meta => |ex| {
+ return parts.len == 2 and strings.eql(parts[0], "import") and strings.eql(parts[1], "meta");
+ },
+ .e_identifier => |ex| {
+ // The last expression must be an identifier
+ if (parts.len == 1) {
+ const name = p.loadNameFromRef(ex.ref);
+ if (!strings.eql(name, parts[0])) {
+ return false;
+ }
+
+ const result = p.findSymbol(expr.loc, name) catch return false;
+
+ // We must not be in a "with" statement scope
+ if (result.is_inside_with_scope) {
+ return false;
+ }
+
+ // The last symbol must be unbound
+ return p.symbols.items[result.ref.inner_index].kind == .unbound;
+ }
+ },
+ else => {},
+ }
+
+ return false;
+ }
+
+ pub fn visitBinding(p: *P, binding: BindingNodeIndex, duplicate_arg_check: ?*StringBoolMap) void {
+ switch (binding.data) {
+ .b_missing => {},
+ .b_identifier => |bind| {
+ p.recordDeclaredSymbol(bind.ref) catch unreachable;
+ const name = p.symbols.items[bind.ref.inner_index].original_name;
+ if (isEvalOrArguments(name)) {
+ p.markStrictModeFeature(.eval_or_arguments, js_lexer.rangeOfIdentifier(&p.source, binding.loc), name) catch unreachable;
+ }
+
+ if (duplicate_arg_check) |dup| {
+ const res = dup.getOrPut(name) catch unreachable;
+ if (res.found_existing) {
+ p.log.addRangeErrorFmt(
+ p.source,
+ js_lexer.rangeOfIdentifier(&p.source, binding.loc),
+ p.allocator,
+ "\"{s}\" cannot be bound multiple times in the same parameter list",
+ .{name},
+ ) catch unreachable;
+ }
+ res.entry.value = true;
+ }
+ },
+ .b_array => |bind| {
+ for (bind.items) |*item| {
+ p.visitBinding(item.binding, duplicate_arg_check);
+ if (item.default_value) |default_value| {
+ const was_anonymous_named_expr = p.isAnonymousNamedExpr(default_value);
+ item.default_value = p.visitExpr(default_value);
+
+ switch (item.binding.data) {
+ .b_identifier => |bind_| {
+ item.default_value = p.maybeKeepExprSymbolName(
+ item.default_value orelse unreachable,
+ p.symbols.items[bind_.ref.inner_index].original_name,
+ was_anonymous_named_expr,
+ );
+ },
+ else => {},
+ }
+ }
+ }
+ },
+ .b_object => |bind| {
+ var i: usize = 0;
+ while (i < bind.properties.len) : (i += 1) {
+ var property = bind.properties[i];
+ if (!property.flags.is_spread) {
+ property.key = p.visitExpr(property.key);
+ }
+
+ p.visitBinding(property.value, duplicate_arg_check);
+ if (property.default_value) |default_value| {
+ const was_anonymous_named_expr = p.isAnonymousNamedExpr(default_value);
+ property.default_value = p.visitExpr(default_value);
+
+ switch (property.value.data) {
+ .b_identifier => |bind_| {
+ property.default_value = p.maybeKeepExprSymbolName(
+ property.default_value orelse unreachable,
+ p.symbols.items[bind_.ref.inner_index].original_name,
+ was_anonymous_named_expr,
+ );
+ },
+ else => {},
+ }
+ }
+ bind.properties[i] = property;
+ }
+ },
+ else => {
+ p.panic("Unexpected binding {s}", .{binding});
+ },
+ }
+ }
+
+ pub fn visitLoopBody(p: *P, stmt: StmtNodeIndex) StmtNodeIndex {
+ const old_is_inside_loop = p.fn_or_arrow_data_visit.is_inside_loop;
+ p.fn_or_arrow_data_visit.is_inside_loop = true;
+ defer p.fn_or_arrow_data_visit.is_inside_loop = old_is_inside_loop;
+ p.loop_body = stmt.data;
+ return p.visitSingleStmt(stmt, .loop_body);
+ }
+
+ pub fn visitSingleStmt(p: *P, stmt: Stmt, kind: StmtsKind) Stmt {
+ const has_if_scope = has_if: {
+ switch (stmt.data) {
+ .s_function => |func| {
+ break :has_if func.func.flags.has_if_scope;
+ },
+ else => {
+ break :has_if false;
+ },
+ }
+ };
+
+ // Introduce a fake block scope for function declarations inside if statements
+ if (has_if_scope) {
+ p.pushScopeForVisitPass(.block, stmt.loc) catch unreachable;
+ }
+
+ var stmts = List(Stmt).initCapacity(p.allocator, 1) catch unreachable;
+ stmts.append(stmt) catch unreachable;
+ p.visitStmts(&stmts, kind) catch unreachable;
+
+ if (has_if_scope) {
+ p.popScope();
+ }
+
+ return p.stmtsToSingleStmt(stmt.loc, stmts.toOwnedSlice());
+ }
+
+ // One statement could potentially expand to several statements
+ pub fn stmtsToSingleStmt(p: *P, loc: logger.Loc, stmts: []Stmt) Stmt {
+ if (stmts.len == 0) {
+ return p.s(S.Empty{}, loc);
+ }
+
+ if (stmts.len == 1) {
+ switch (stmts[0].data) {
+ .s_local => |local| {
+ // "let" and "const" must be put in a block when in a single-statement context
+
+ if (local.kind == .k_var) {
+ return stmts[0];
+ }
+ },
+ else => {
+ return stmts[0];
+ },
+ }
+ }
+
+ return p.s(S.Block{ .stmts = stmts }, loc);
+ }
+
+ pub fn findLabelSymbol(p: *P, loc: logger.Loc, name: string) FindLabelSymbolResult {
+ var res = FindLabelSymbolResult{ .ref = undefined, .is_loop = false };
+
+ var _scope: ?*Scope = p.current_scope;
+
+ while (_scope) |scope| : (_scope = scope.parent) {
+ var label_ref = scope.label_ref orelse continue;
+
+ if (!scope.kindStopsHoisting() or (scope.kind != .label) or !strings.eql(name, p.symbols.items[label_ref.inner_index].original_name)) {
+ continue;
+ }
+
+ // Track how many times we've referenced this symbol
+ p.recordUsage(&label_ref);
+ res.ref = label_ref;
+ res.is_loop = scope.label_stmt_is_loop;
+ res.found = true;
+ break;
+ }
+
+ const r = js_lexer.rangeOfIdentifier(&p.source, loc);
+ p.log.addRangeErrorFmt(p.source, r, p.allocator, "There is no containing label named {s}", .{name}) catch unreachable;
+
+ // Allocate an "unbound" symbol
+ var ref = p.newSymbol(.unbound, name) catch unreachable;
+
+ // Track how many times we've referenced this symbol
+ p.recordUsage(&ref);
+
+ return res;
+ }
+
+ pub fn visitClass(p: *P, name_scope_loc: logger.Loc, class: *G.Class) Ref {
+ class.ts_decorators = p.visitTSDecorators(class.ts_decorators);
+
+ if (class.class_name) |name| {
+ p.recordDeclaredSymbol(name.ref.?) catch unreachable;
+ }
+
+ p.pushScopeForVisitPass(.class_name, name_scope_loc) catch unreachable;
+ const old_enclosing_class_keyword = p.enclosing_class_keyword;
+ p.enclosing_class_keyword = class.class_keyword;
+ p.current_scope.recursiveSetStrictMode(.implicit_strict_mode_class);
+ var class_name_ref: Ref = if (class.class_name != null) class.class_name.?.ref.? else p.newSymbol(.other, "this") catch unreachable;
+
+ var shadow_ref = Ref.None;
+
+ if (!class_name_ref.eql(Ref.None)) {
+ // are not allowed to assign to this symbol (it throws a TypeError).
+ const name = p.symbols.items[class_name_ref.inner_index].original_name;
+ var identifier = p.allocator.alloc(u8, name.len + 1) catch unreachable;
+ std.mem.copy(u8, identifier[1..identifier.len], name);
+ identifier[0] = '_';
+ shadow_ref = p.newSymbol(Symbol.Kind.cconst, identifier) catch unreachable;
+ p.recordDeclaredSymbol(shadow_ref) catch unreachable;
+ if (class.class_name) |class_name| {
+ p.current_scope.members.put(identifier, Scope.Member{ .loc = class_name.loc, .ref = shadow_ref }) catch unreachable;
+ }
+ }
+
+ if (class.extends) |extends| {
+ class.extends = p.visitExpr(extends);
+ }
+
+ p.pushScopeForVisitPass(.class_body, class.body_loc) catch unreachable;
+ defer p.popScope();
+
+ var i: usize = 0;
+ while (i < class.properties.len) : (i += 1) {
+ var property = &class.properties[i];
+ property.ts_decorators = p.visitTSDecorators(property.ts_decorators);
+ const is_private = if (property.key != null) @as(Expr.Tag, property.key.?.data) == .e_private_identifier else false;
+
+ // Special-case EPrivateIdentifier to allow it here
+
+ if (is_private) {
+ p.recordDeclaredSymbol(property.key.?.data.e_private_identifier.ref) catch unreachable;
+ } else if (property.key) |key| {
+ class.properties[i].key = p.visitExpr(key);
+ }
+
+ // Make it an error to use "arguments" in a class body
+ p.current_scope.forbid_arguments = true;
+ defer p.current_scope.forbid_arguments = false;
+
+ // The value of "this" is shadowed inside property values
+ const old_is_this_captured = p.fn_only_data_visit.is_this_nested;
+ const old_this = p.fn_only_data_visit.this_class_static_ref;
+ p.fn_only_data_visit.is_this_nested = true;
+ p.fn_only_data_visit.this_class_static_ref = null;
+ defer p.fn_only_data_visit.is_this_nested = old_is_this_captured;
+ defer p.fn_only_data_visit.this_class_static_ref = old_this;
+
+ // We need to explicitly assign the name to the property initializer if it
+ // will be transformed such that it is no longer an inline initializer.
+ var name_to_keep: ?string = null;
+ if (is_private) {} else if (!property.flags.is_method and !property.flags.is_computed) {
+ if (property.key) |key| {
+ if (@as(Expr.Tag, key.data) == .e_string) {
+ name_to_keep = p.lexer.utf16ToString(key.data.e_string.value);
+ }
+ }
+ }
+
+ if (property.value) |val| {
+ if (name_to_keep) |name| {
+ const was_anon = p.isAnonymousNamedExpr(val);
+ property.value = p.maybeKeepExprSymbolName(p.visitExpr(val), name, was_anon);
+ } else {
+ property.value = p.visitExpr(val);
+ }
+ }
+
+ if (property.initializer) |val| {
+ // if (property.flags.is_static and )
+ if (name_to_keep) |name| {
+ const was_anon = p.isAnonymousNamedExpr(val);
+ property.initializer = p.maybeKeepExprSymbolName(p.visitExpr(val), name, was_anon);
+ } else {
+ property.initializer = p.visitExpr(val);
+ }
+ }
+ }
+
+ if (!shadow_ref.eql(Ref.None)) {
+ if (p.symbols.items[shadow_ref.inner_index].use_count_estimate == 0) {
+ // Don't generate a shadowing name if one isn't needed
+ shadow_ref = Ref.None;
+ } else if (class.class_name) |class_name| {
+ // If there was originally no class name but something inside needed one
+ // (e.g. there was a static property initializer that referenced "this"),
+ // store our generated name so the class expression ends up with a name.
+ class.class_name = LocRef{ .loc = name_scope_loc, .ref = class_name_ref };
+ p.current_scope.generated.append(class_name_ref) catch unreachable;
+ p.recordDeclaredSymbol(class_name_ref) catch unreachable;
+ }
+ }
+
+ return shadow_ref;
+ }
+
+ fn keepStmtSymbolName(p: *P, loc: logger.Loc, ref: Ref, name: string) Stmt {
+ var exprs = p.allocator.alloc(Expr, 2) catch unreachable;
+ exprs[0] = p.e(E.Identifier{
+ .ref = ref,
+ }, loc);
+ exprs[1] = p.e(E.String{ .value = strings.toUTF16Alloc(name, p.allocator) catch unreachable }, loc);
+ return p.s(S.SExpr{
+ // I believe that this is a spot we can do $RefreshReg$(name)
+ .value = p.callRuntime(loc, "__name", exprs),
+
+ // Make sure tree shaking removes this if the function is never used
+ .does_not_affect_tree_shaking = true,
+ }, loc);
+ }
+
+ pub fn callRuntime(p: *P, loc: logger.Loc, name: string, args: []Expr) Expr {
+ var ref: Ref = undefined;
+ if (!p.runtime_imports.contains(name)) {
+ ref = p.newSymbol(.other, name) catch unreachable;
+ p.module_scope.generated.append(ref) catch unreachable;
+ p.runtime_imports.put(name, ref) catch unreachable;
+ } else {
+ ref = p.runtime_imports.get(name) orelse unreachable;
+ }
+
+ p.recordUsage(&ref);
+ return p.e(E.Call{
+ .target = p.e(E.Identifier{
+ .ref = ref,
+ }, loc),
+ .args = args,
+ }, loc);
+ }
+
+ fn visitStmts(p: *P, stmts: *List(Stmt), kind: StmtsKind) !void {
+ // Save the current control-flow liveness. This represents if we are
+ // currently inside an "if (false) { ... }" block.
+ var old_is_control_flow_dead = p.is_control_flow_dead;
+
+ // visit all statements first
+ var visited = try List(Stmt).initCapacity(p.allocator, stmts.items.len);
+ var before = List(Stmt).init(p.allocator);
+ var after = List(Stmt).init(p.allocator);
+ for (stmts.items) |*stmt| {
+ switch (stmt.data) {
+ .s_export_equals => {
+ // TypeScript "export = value;" becomes "module.exports = value;". This
+ // must happen at the end after everything is parsed because TypeScript
+ // moves this statement to the end when it generates code.
+ try p.visitAndAppendStmt(&after, stmt);
+ continue;
+ },
+ .s_function => |data| {
+ // Manually hoist block-level function declarations to preserve semantics.
+ // This is only done for function declarations that are not generators
+ // or async functions, since this is a backwards-compatibility hack from
+ // Annex B of the JavaScript standard.
+ if (!p.current_scope.kindStopsHoisting() and p.symbols.items[data.func.name.?.ref.?.inner_index].kind == .hoisted_function) {
+ try p.visitAndAppendStmt(&before, stmt);
+ continue;
+ }
+ },
+ else => {},
+ }
+ try p.visitAndAppendStmt(&visited, stmt);
+ }
+ }
+
+ fn extractDeclsForBinding(binding: Binding, decls: *List(G.Decl)) !void {
+ switch (binding.data) {
+ .b_property, .b_missing => {},
+ .b_identifier => {
+ try decls.append(G.Decl{ .binding = binding });
+ },
+ .b_array => |arr| {
+ for (arr.items) |item| {
+ extractDeclsForBinding(item.binding, decls) catch unreachable;
+ }
+ },
+ .b_object => |obj| {
+ for (obj.properties) |prop| {
+ extractDeclsForBinding(prop.value, decls) catch unreachable;
+ }
+ },
+ }
+ }
+
+ // This assumes that the open parenthesis has already been parsed by the caller
+ pub fn parseParenExpr(p: *P, loc: logger.Loc, opts: ParenExprOpts) !Expr {
+ var items_list = try List(Expr).initCapacity(p.allocator, 1);
+ var errors = DeferredErrors{};
+ var arrowArgErrors = DeferredArrowArgErrors{};
+ var spread_range = logger.Range{};
+ var type_colon_range = logger.Range{};
+ var comma_after_spread = logger.Loc{};
+
+ // Push a scope assuming this is an arrow function. It may not be, in which
+ // case we'll need to roll this change back. This has to be done ahead of
+ // parsing the arguments instead of later on when we hit the "=>" token and
+ // we know it's an arrow function because the arguments may have default
+ // values that introduce new scopes and declare new symbols. If this is an
+ // arrow function, then those new scopes will need to be parented under the
+ // scope of the arrow function itself.
+ const scopeIndex = try p.pushScopeForParsePass(.function_args, loc);
+
+ // Allow "in" inside parentheses
+ var oldAllowIn = p.allow_in;
+ p.allow_in = true;
+
+ // Forbid "await" and "yield", but only for arrow functions
+ var old_fn_or_arrow_data = p.fn_or_arrow_data_parse;
+ p.fn_or_arrow_data_parse.arrow_arg_errors = arrowArgErrors;
+
+ // Scan over the comma-separated arguments or expressions
+ while (p.lexer.token != .t_close_paren) {
+ const item_loc = p.lexer.loc();
+ const is_spread = p.lexer.token == .t_dot_dot_dot;
+
+ if (is_spread) {
+ spread_range = p.lexer.range();
+ // p.markSyntaxFeature()
+ p.lexer.next();
+ }
+
+ // We don't know yet whether these are arguments or expressions, so parse
+ p.latest_arrow_arg_loc = p.lexer.loc();
+
+ var item = p.parseExprOrBindings(.comma, &errors);
+
+ if (is_spread) {
+ item = p.e(E.Spread{ .value = item }, loc);
+ }
+
+ // Skip over types
+ if (p.options.ts and p.lexer.token == .t_colon) {
+ type_colon_range = p.lexer.range();
+ p.lexer.next();
+ p.skipTypescriptType(.lowest);
+ }
+
+ if (p.options.ts and p.lexer.token == .t_equals and !p.forbid_suffix_after_as_loc.eql(p.lexer.loc())) {
+ p.lexer.next();
+ item = Expr.assign(item, p.parseExpr(.comma), p.allocator);
+ }
+
+ items_list.append(item) catch unreachable;
+
+ if (p.lexer.token != .t_comma) {
+ break;
+ }
+
+ // Spread arguments must come last. If there's a spread argument followed
+ if (is_spread) {
+ comma_after_spread = p.lexer.loc();
+ }
+
+ // Eat the comma token
+ p.lexer.next();
+ }
+ var items = items_list.toOwnedSlice();
+
+ // The parenthetical construct must end with a close parenthesis
+ p.lexer.expect(.t_close_paren);
+
+ // Restore "in" operator status before we parse the arrow function body
+ p.allow_in = oldAllowIn;
+
+ // Also restore "await" and "yield" expression errors
+ p.fn_or_arrow_data_parse = old_fn_or_arrow_data;
+
+ // Are these arguments to an arrow function?
+ if (p.lexer.token == .t_equals_greater_than or opts.force_arrow_fn or (p.options.ts and p.lexer.token == .t_colon)) {
+ var invalidLog = List(logger.Loc).init(p.allocator);
+ var args = List(G.Arg).init(p.allocator);
+
+ if (opts.is_async) {
+ // markl,oweredsyntaxpoksdpokasd
+ }
+
+ // First, try converting the expressions to bindings
+ for (items) |*_item| {
+ var item = _item;
+ var is_spread = false;
+ switch (item.data) {
+ .e_spread => |v| {
+ is_spread = true;
+ item = &v.value;
+ },
+ else => {},
+ }
+
+ const tuple = p.convertExprToBindingAndInitializer(item, &invalidLog, is_spread);
+ assert(tuple.binding != null);
+ // double allocations
+ args.append(G.Arg{
+ .binding = tuple.binding orelse unreachable,
+ .default = tuple.expr,
+ }) catch unreachable;
+ }
+
+ // Avoid parsing TypeScript code like "a ? (1 + 2) : (3 + 4)" as an arrow
+ // function. The ":" after the ")" may be a return type annotation, so we
+ // attempt to convert the expressions to bindings first before deciding
+ // whether this is an arrow function, and only pick an arrow function if
+ // there were no conversion errors.
+ if (p.lexer.token == .t_equals_greater_than or (invalidLog.items.len == 0 and (p.trySkipTypeScriptTypeParametersThenOpenParenWithBacktracking() or opts.force_arrow_fn))) {
+ p.maybeCommaSpreadError(comma_after_spread);
+ p.logArrowArgErrors(&arrowArgErrors);
+ }
+ }
+
+ // If we get here, it's not an arrow function so undo the pushing of the
+ // scope we did earlier. This needs to flatten any child scopes into the
+ // parent scope as if the scope was never pushed in the first place.
+ p.popAndFlattenScope(scopeIndex);
+
+ // If this isn't an arrow function, then types aren't allowed
+ if (type_colon_range.len > 0) {
+ try p.log.addRangeError(p.source, type_colon_range, "Unexpected \":\"");
+ p.panic("", .{});
+ }
+
+ // Are these arguments for a call to a function named "async"?
+ if (opts.is_async) {
+ p.logExprErrors(&errors);
+ const async_expr = p.e(E.Identifier{ .ref = try p.storeNameInRef("async") }, loc);
+ return p.e(E.Call{ .target = async_expr, .args = items }, loc);
+ }
+
+ // Is this a chain of expressions and comma operators?
+
+ if (items.len > 0) {
+ p.logExprErrors(&errors);
+ if (spread_range.len > 0) {
+ try p.log.addRangeError(p.source, type_colon_range, "Unexpected \"...\"");
+ p.panic("", .{});
+ }
+
+ var value = Expr.joinAllWithComma(items, p.allocator);
+ p.markExprAsParenthesized(&value);
+ return value;
+ }
+
+ // Indicate that we expected an arrow function
+ p.lexer.expected(.t_equals_greater_than);
+ p.panic("", .{});
+ }
+
+ pub fn popAndFlattenScope(p: *P, scope_index: usize) void {
+ // Move up to the parent scope
+ var to_flatten = p.current_scope;
+ var parent = to_flatten.parent.?;
+ p.current_scope = parent;
+ var scopes_in_order = p.scopes_in_order.toOwnedSlice();
+ // Erase this scope from the order. This will shift over the indices of all
+ // the scopes that were created after us. However, we shouldn't have to
+ // worry about other code with outstanding scope indices for these scopes.
+ // These scopes were all created in between this scope's push and pop
+ // operations, so they should all be child scopes and should all be popped
+ // by the time we get here.
+ std.mem.copy(ScopeOrder, scopes_in_order[scope_index..scopes_in_order.len], scopes_in_order[scope_index + 1 .. scopes_in_order.len]);
+ p.scopes_in_order = @TypeOf(p.scopes_in_order).fromOwnedSlice(p.allocator, scopes_in_order);
+
+ // Remove the last child from the parent scope
+ const last = parent.children.items.len - 1;
+ assert(parent.children.items[last] == to_flatten);
+ _ = parent.children.popOrNull();
+
+ for (to_flatten.children.items) |item| {
+ item.parent = parent;
+ parent.children.append(item) catch unreachable;
+ }
+ }
+
+ pub fn maybeCommaSpreadError(p: *P, _comma_after_spread: ?logger.Loc) void {
+ if (_comma_after_spread) |comma_after_spread| {
+ p.log.addRangeError(p.source, logger.Range{ .loc = comma_after_spread, .len = 1 }, "Unexpected \",\" after rest pattern") catch unreachable;
+ }
+ }
+
+ pub fn toAST(p: *P, _parts: []js_ast.Part) !js_ast.Ast {
+ var parts = _parts;
+ // Insert an import statement for any runtime imports we generated
+ if (p.runtime_imports.count() > 0 and !p.options.omit_runtime_for_tests) {}
+
+ var parts_end: usize = 0;
+ // Handle import paths after the whole file has been visited because we need
+ // symbol usage counts to be able to remove unused type-only imports in
+ // TypeScript code.
+ while (true) {
+ var kept_import_equals = false;
+ var removed_import_equals = false;
+
+ var i: usize = 0;
+ // Potentially remove some statements, then filter out parts to remove any
+ // with no statements
+ while (i < parts.len) : (i += 1) {
+ var part = parts[i];
+ _ = p.import_records_for_current_part.toOwnedSlice();
+ _ = p.declared_symbols.toOwnedSlice();
+
+ var result = try ImportScanner.scan(p, part.stmts);
+ kept_import_equals = kept_import_equals or result.kept_import_equals;
+ removed_import_equals = removed_import_equals or result.removed_import_equals;
+ part.import_record_indices = p.import_records_for_current_part.toOwnedSlice();
+ part.declared_symbols = p.declared_symbols.toOwnedSlice();
+ part.stmts = result.stmts;
+ if (part.stmts.len > 0) {
+ if (p.module_scope.contains_direct_eval and part.declared_symbols.len > 0) {
+ // If this file contains a direct call to "eval()", all parts that
+ // declare top-level symbols must be kept since the eval'd code may
+ // reference those symbols.
+ part.can_be_removed_if_unused = false;
+ }
+ parts[parts_end] = part;
+ parts_end += 1;
+ }
+ }
+
+ // We need to iterate multiple times if an import-equals statement was
+ // removed and there are more import-equals statements that may be removed
+ if (!kept_import_equals or !removed_import_equals) {
+ break;
+ }
+ }
+
+ parts = parts[0..parts_end];
+ // Analyze cross-part dependencies for tree shaking and code splitting
+
+ {
+ // Map locals to parts
+ p.top_level_symbol_to_parts = @TypeOf(p.top_level_symbol_to_parts).init(p.allocator);
+ var i: usize = 0;
+ while (i < parts.len) : (i += 1) {
+ const part = parts[i];
+ for (part.declared_symbols) |declared| {
+ if (declared.is_top_level) {
+ if (p.top_level_symbol_to_parts.contains(declared.ref)) {
+ try p.top_level_symbol_to_parts.get(declared.ref).?.append(@intCast(u32, i));
+ } else {
+ var list = try List(u32).initCapacity(p.allocator, 1);
+ list.appendAssumeCapacity(@intCast(u32, i));
+ try p.top_level_symbol_to_parts.put(declared.ref, list);
+ }
+ }
+ }
+ }
+
+ // Each part tracks the other parts it depends on within this file
+ var local_dependencies = std.AutoHashMap(u32, u32).init(p.allocator);
+
+ i = 0;
+ while (i < parts.len) : (i += 1) {
+ const part = parts[i];
+ var iter = part.symbol_uses.iterator();
+ var dependencies = List(js_ast.Dependency).init(p.allocator);
+ while (iter.next()) |entry| {
+ const ref = entry.key;
+
+ if (p.top_level_symbol_to_parts.get(ref)) |tlstp| {
+ for (tlstp.items) |other_part_index| {
+ if (!local_dependencies.contains(other_part_index) or other_part_index != i) {
+ try local_dependencies.put(other_part_index, @intCast(u32, i));
+ try dependencies.append(js_ast.Dependency{
+ .source_index = p.source.index,
+ .part_index = other_part_index,
+ });
+ }
+ }
+ }
+
+ // Also map from imports to parts that use them
+ // TODO: will appending to this list like this be a perf issue?
+ if (p.named_imports.getEntry(ref)) |named_import_entry| {
+ const named_import = named_import_entry.value;
+ var buf = try p.allocator.alloc(u32, named_import.local_parts_with_uses.len + 1);
+ if (named_import.local_parts_with_uses.len > 0) {
+ std.mem.copy(u32, buf, named_import.local_parts_with_uses);
+ }
+ buf[buf.len - 1] = @intCast(u32, i);
+ named_import_entry.value.local_parts_with_uses = buf;
+ }
+ }
+ }
+ }
+
+ var exports_kind = js_ast.ExportsKind.none;
+ const uses_exports_ref = p.symbols.items[p.exports_ref.inner_index].use_count_estimate > 0;
+ const uses_module_ref = p.symbols.items[p.module_ref.inner_index].use_count_estimate > 0;
+
+ if (p.es6_export_keyword.len > 0 or p.top_level_await_keyword.len > 0) {
+ exports_kind = .esm;
+ } else if (uses_exports_ref or uses_module_ref or p.has_top_level_return) {
+ exports_kind = .cjs;
+ } else {
+ exports_kind = .esm;
+ }
+
+ var wrapper_name = try p.allocator.alloc(u8, "require_".len + p.source.identifier_name.len);
+ std.mem.copy(u8, wrapper_name[0.."require_".len], "require_");
+ std.mem.copy(u8, wrapper_name["require_".len..wrapper_name.len], p.source.identifier_name);
+
+ var wrapper = try p.newSymbol(.other, wrapper_name);
+
+ return js_ast.Ast{
+ .parts = parts,
+ .module_scope = p.module_scope.*,
+ .symbols = p.symbols.toOwnedSlice(),
+ .exports_ref = p.exports_ref,
+ .wrapper_ref = wrapper,
+ .import_records = p.import_records.toOwnedSlice(),
+ .export_star_import_records = p.export_star_import_records.toOwnedSlice(),
+ .top_level_symbol_to_parts = p.top_level_symbol_to_parts,
+ .approximate_line_count = p.lexer.approximate_newline_count + 1,
+ .exports_kind = exports_kind,
+ .named_imports = p.named_imports,
+ .named_exports = p.named_exports,
+ .import_keyword = p.es6_import_keyword,
+ .export_keyword = p.es6_export_keyword,
+ // .top_Level_await_keyword = p.top_level_await_keyword,
+ };
+ }
+
+ pub fn init(allocator: *std.mem.Allocator, log: *logger.Log, source: logger.Source, define: *Define, lexer: js_lexer.Lexer, opts: Parser.Options) !*P {
+ var parser = try allocator.create(P);
+ parser.allocated_names = @TypeOf(parser.allocated_names).init(allocator);
+ parser.define = define;
+ parser.scopes_for_current_part = @TypeOf(parser.scopes_for_current_part).init(allocator);
+ parser.symbols = @TypeOf(parser.symbols).init(allocator);
+ parser.ts_use_counts = @TypeOf(parser.ts_use_counts).init(allocator);
+ parser.declared_symbols = @TypeOf(parser.declared_symbols).init(allocator);
+ parser.known_enum_values = @TypeOf(parser.known_enum_values).init(allocator);
+ parser.import_records = @TypeOf(parser.import_records).init(allocator);
+ parser.import_records_for_current_part = @TypeOf(parser.import_records_for_current_part).init(allocator);
+ parser.export_star_import_records = @TypeOf(parser.export_star_import_records).init(allocator);
+ parser.import_items_for_namespace = @TypeOf(parser.import_items_for_namespace).init(allocator);
+ parser.named_imports = @TypeOf(parser.named_imports).init(allocator);
+ parser.named_exports = @TypeOf(parser.named_exports).init(allocator);
+ parser.top_level_symbol_to_parts = @TypeOf(parser.top_level_symbol_to_parts).init(allocator);
+ parser.import_namespace_cc_map = @TypeOf(parser.import_namespace_cc_map).init(allocator);
+ parser.scopes_in_order = @TypeOf(parser.scopes_in_order).init(allocator);
+ parser.temp_refs_to_declare = @TypeOf(parser.temp_refs_to_declare).init(allocator);
+ parser.relocated_top_level_vars = @TypeOf(parser.relocated_top_level_vars).init(allocator);
+ parser.log = log;
+ parser.is_import_item = @TypeOf(parser.is_import_item).init(allocator);
+ parser.allocator = allocator;
+ parser.runtime_imports = StringRefMap.init(allocator);
+ parser.options = opts;
+ parser.to_expr_wrapper_namespace = Binding2ExprWrapper.Namespace.init(parser);
+ parser.to_expr_wrapper_hoisted = Binding2ExprWrapper.Hoisted.init(parser);
+ parser.source = source;
+ parser.import_transposer = @TypeOf(parser.import_transposer).init(parser);
+ parser.require_transposer = @TypeOf(parser.require_transposer).init(parser);
+ parser.require_resolve_transposer = @TypeOf(parser.require_resolve_transposer).init(parser);
+ parser.lexer = lexer;
+ parser.data = js_ast.AstData.init(allocator);
+
+ _ = try parser.pushScopeForParsePass(.entry, locModuleScope);
+
+ return parser;
+ }
+};
+
+// The "await" and "yield" expressions are never allowed in argument lists but
+// may or may not be allowed otherwise depending on the details of the enclosing
+// function or module. This needs to be handled when parsing an arrow function
+// argument list because we don't know if these expressions are not allowed until
+// we reach the "=>" token (or discover the absence of one).
+//
+// Specifically, for await:
+//
+// // This is ok
+// async function foo() { (x = await y) }
+//
+// // This is an error
+// async function foo() { (x = await y) => {} }
+//
+// And for yield:
+//
+// // This is ok
+// function* foo() { (x = yield y) }
+//
+// // This is an error
+// function* foo() { (x = yield y) => {} }
+//
+const DeferredArrowArgErrors = struct {
+ invalid_expr_await: logger.Range = logger.Range.None,
+ invalid_expr_yield: logger.Range = logger.Range.None,
+};
diff --git a/src/js_parser/js_parser_test.zig b/src/js_parser/js_parser_test.zig
new file mode 100644
index 000000000..e1b44c62b
--- /dev/null
+++ b/src/js_parser/js_parser_test.zig
@@ -0,0 +1,499 @@
+usingnamespace @import("./imports.zig");
+usingnamespace @import("./js_parser.zig");
+
+usingnamespace @import("../linker.zig");
+
+const SymbolList = [][]Symbol;
+
+// const Tester = struct {
+// allocator: *std.mem.Allocator,
+
+// pub const Expectation = struct {
+// target: anytype,
+
+// pub fn report(writer: anytype) void {}
+
+// pub const Outcome = enum {
+// pending,
+// pass,
+// fail,
+// };
+
+// const Normalized = struct {
+// value: NormalizedValue,
+// optional: bool = false,
+// pointer: bool = false,
+// array_like: bool = false,
+
+// const NormalizedValue = union(enum) {
+// Struct: anytype,
+// Number: f64,
+// String: anytype,
+// };
+
+// pub fn parse_valuetype(value: anytype, was_optional: bool, was_pointer: bool, was_arraylike: bool, original_value: anytype) Normalized {
+// switch (@typeInfo(@TypeOf(value))) {
+// .Pointer => |info| {
+// return switch (info.size) {
+// .One => {
+// return parse_valuetype(value.*, was_optional, true, was_arraylike, original_value);
+// },
+// .Many, .C => @compileError("Not supported."),
+// .Slice => |slice| {
+// return parse_valuetype(value.ptr.*, was_optional, true, true, original_value);
+// },
+// };
+// },
+// .Enum => |info| {
+// return parse_valuetype(@enumToInt(value), was_optional, was_pointer, was_arraylike, original_value);
+// },
+// .Struct => |info| {
+// return Normalized{
+// .value = NormalizedValue{
+// .Struct = original_value,
+// },
+// .optional = was_optional,
+// .pointer = was_pointer,
+// .array_like = was_arraylike,
+// };
+// },
+// .Int => |info| {
+// if (std.meta.bitCount(@TypeOf(value)) == 8)
+// return Normalized{
+// .value = NormalizedValue{
+// .Number = @intToFloat(f64, value),
+// },
+// .optional = was_optional,
+// .pointer = was_pointer,
+// .array_like = was_arraylike,
+// };
+// },
+// .ComptimeInt => {
+// return Normalized{
+// .value = NormalizedValue{
+// .Number = @intToFloat(f64, value),
+// },
+// .optional = was_optional,
+// .pointer = was_pointer,
+// .array_like = was_arraylike,
+// };
+// },
+// .Float => |info| {
+// return Normalized{
+// .value = NormalizedValue{
+// .Number = @floatCast(f64, value),
+// },
+// .optional = was_optional,
+// .pointer = was_pointer,
+// .array_like = was_arraylike,
+// };
+// },
+// }
+// }
+
+// pub fn init(value: anytype) Normalized {
+// return Normalized.parse_valuetype(value, false, false, false, value);
+// }
+// };
+
+// fn equals(a: anytype) bool {
+// const T = @TypeOf(a);
+// const a_info = @typeInfo(T);
+// const Tb = @TypeOf(b);
+// const b_info = @typeInfo(Tb);
+
+// const a_final = a_getter: {};
+
+// switch (@typeInfo(T)) {
+// .Struct => |info| {
+// inline for (info.fields) |field_info| {
+// if (!eql(@field(a, field_info.name), @field(b, field_info.name))) return false;
+// }
+// return true;
+// },
+// .ErrorUnion => {
+// if (a) |a_p| {
+// if (b) |b_p| return eql(a_p, b_p) else |_| return false;
+// } else |a_e| {
+// if (b) |_| return false else |b_e| return a_e == b_e;
+// }
+// },
+// .Union => |info| {
+// if (info.tag_type) |UnionTag| {
+// const tag_a = activeTag(a);
+// const tag_b = activeTag(b);
+// if (tag_a != tag_b) return false;
+
+// inline for (info.fields) |field_info| {
+// if (@field(UnionTag, field_info.name) == tag_a) {
+// return eql(@field(a, field_info.name), @field(b, field_info.name));
+// }
+// }
+// return false;
+// }
+
+// @compileError("cannot compare untagged union type " ++ @typeName(T));
+// },
+// .Array => {
+// if (a.len != b.len) return false;
+// for (a) |e, i|
+// if (!eql(e, b[i])) return false;
+// return true;
+// },
+// .Vector => |info| {
+// var i: usize = 0;
+// while (i < info.len) : (i += 1) {
+// if (!eql(a[i], b[i])) return false;
+// }
+// return true;
+// },
+// .Pointer => |info| {
+// return switch (info.size) {
+// .One, .Many, .C => a == b,
+// .Slice => |slice| {
+// if (a.len != b.len) {
+// return false;
+// }
+// for (a) |e, i|
+// if (!eql(e, b[i])) return false;
+// },
+// };
+// },
+// .Optional => {
+// return eql(a.?, b.?);
+// },
+// else => return a == b,
+// }
+// }
+
+// pub fn toBe(value: anytype) *Expectation {}
+// };
+
+// pub fn expect(outcome: anytype) Expectation {}
+// pub fn init(allocator: *std.mem.Allocator) Tester {
+// return Tester{ .allocator = allocator };
+// }
+// };
+
+const RED = "\x1b[31;1m";
+const GREEN = "\x1b[32;1m";
+const CYAN = "\x1b[36;1m";
+const WHITE = "\x1b[37;1m";
+const DIM = "\x1b[2m";
+const RESET = "\x1b[0m";
+
+pub const Tester = struct {
+ pass: std.ArrayList(Expectation),
+ fail: std.ArrayList(Expectation),
+ allocator: *std.mem.Allocator,
+
+ pub fn t(allocator: *std.mem.Allocator) Tester {
+ return Tester{
+ .allocator = allocator,
+ .pass = std.ArrayList(Expectation).init(allocator),
+ .fail = std.ArrayList(Expectation).init(allocator),
+ };
+ }
+
+ pub const Expectation = struct {
+ expected: string,
+ result: string,
+ source: std.builtin.SourceLocation,
+
+ pub fn init(expected: string, result: string, src: std.builtin.SourceLocation) Expectation {
+ return Expectation{
+ .expected = expected,
+ .result = result,
+ .source = src,
+ };
+ }
+ const PADDING = 0;
+ pub fn print(self: *const @This()) void {
+ var pad = &([_]u8{' '} ** PADDING);
+ var stderr = std.io.getStdErr();
+
+ stderr.writeAll(RESET) catch unreachable;
+ stderr.writeAll(pad) catch unreachable;
+ stderr.writeAll(DIM) catch unreachable;
+ std.fmt.format(stderr.writer(), "{s}:{d}:{d}", .{ self.source.file, self.source.line, self.source.column }) catch unreachable;
+ stderr.writeAll(RESET) catch unreachable;
+ stderr.writeAll("\n") catch unreachable;
+
+ stderr.writeAll(pad) catch unreachable;
+ stderr.writeAll("Expected: ") catch unreachable;
+ stderr.writeAll(RESET) catch unreachable;
+ stderr.writeAll(GREEN) catch unreachable;
+ std.fmt.format(stderr.writer(), "\"{s}\"", .{self.expected}) catch unreachable;
+ stderr.writeAll(GREEN) catch unreachable;
+ stderr.writeAll(RESET) catch unreachable;
+
+ stderr.writeAll("\n") catch unreachable;
+ stderr.writeAll(pad) catch unreachable;
+ stderr.writeAll("Received: ") catch unreachable;
+ stderr.writeAll(RESET) catch unreachable;
+ stderr.writeAll(RED) catch unreachable;
+ std.fmt.format(stderr.writer(), "\"{s}\"", .{self.result}) catch unreachable;
+ stderr.writeAll(RED) catch unreachable;
+ stderr.writeAll(RESET) catch unreachable;
+ stderr.writeAll("\n") catch unreachable;
+ }
+
+ pub fn evaluate_outcome(self: *const @This()) Outcome {
+ for (self.expected) |char, i| {
+ if (char != self.result[i]) {
+ return Outcome.fail;
+ }
+ }
+
+ return Outcome.pass;
+ }
+ };
+
+ pub const Outcome = enum {
+ pass,
+ fail,
+ };
+ pub fn expect(tester: *Tester, expected: string, result: string, src: std.builtin.SourceLocation) callconv(.Inline) bool {
+ var expectation = Expectation.init(expected, result, src);
+ switch (expectation.evaluate_outcome()) {
+ .pass => {
+ tester.pass.append(expectation) catch unreachable;
+ return true;
+ },
+ .fail => {
+ tester.fail.append(expectation) catch unreachable;
+ return false;
+ },
+ }
+ }
+
+ const ReportType = enum {
+ none,
+ pass,
+ fail,
+ some_fail,
+
+ pub fn init(tester: *Tester) ReportType {
+ if (tester.fail.items.len == 0 and tester.pass.items.len == 0) {
+ return .none;
+ } else if (tester.fail.items.len == 0) {
+ return .pass;
+ } else if (tester.pass.items.len == 0) {
+ return .fail;
+ } else {
+ return .some_fail;
+ }
+ }
+ };
+
+ pub fn report(tester: *Tester, src: std.builtin.SourceLocation) void {
+ var stderr = std.io.getStdErr();
+
+ if (tester.fail.items.len > 0) {
+ std.fmt.format(stderr.writer(), "\n\n", .{}) catch unreachable;
+ }
+
+ for (tester.fail.items) |item| {
+ item.print();
+ std.fmt.format(stderr.writer(), "\n", .{}) catch unreachable;
+ }
+
+ switch (ReportType.init(tester)) {
+ .none => {
+ std.log.info("No expectations.\n\n", .{});
+ },
+ .pass => {
+ std.fmt.format(stderr.writer(), "{s}All {d} expectations passed.{s}\n", .{ GREEN, tester.pass.items.len, GREEN }) catch unreachable;
+ std.fmt.format(stderr.writer(), RESET, .{}) catch unreachable;
+ std.testing.expect(true);
+ },
+ .fail => {
+ std.fmt.format(stderr.writer(), "{s}All {d} expectations failed.{s}\n\n", .{ RED, tester.fail.items.len, RED }) catch unreachable;
+ std.fmt.format(stderr.writer(), RESET, .{}) catch unreachable;
+ std.testing.expect(false);
+ },
+ .some_fail => {
+ std.fmt.format(stderr.writer(), "{s}{d} failed{s} and {s}{d} passed{s} of {d} expectations{s}\n\n", .{
+ RED,
+ tester.fail.items.len,
+ RED ++ RESET,
+ GREEN,
+ tester.pass.items.len,
+ GREEN ++ RESET,
+ tester.fail.items.len + tester.pass.items.len,
+ RESET,
+ }) catch unreachable;
+ std.fmt.format(stderr.writer(), RESET, .{}) catch unreachable;
+ std.testing.expect(false);
+ },
+ }
+ }
+};
+
+fn expectPrinted(t: *Tester, contents: string, expected: string, src: anytype) !void {
+ if (alloc.dynamic_manager == null) {
+ try alloc.setup(std.heap.page_allocator);
+ }
+
+ debugl("INIT TEST");
+
+ const opts = try options.TransformOptions.initUncached(alloc.dynamic, "file.js", contents);
+ var log = logger.Log.init(alloc.dynamic);
+ var source = logger.Source.initFile(opts.entry_point, alloc.dynamic);
+ var ast: js_ast.Ast = undefined;
+
+ var define = try Define.init(alloc.dynamic, null);
+ debugl("INIT PARSER");
+ var parser = try Parser.init(opts, &log, &source, define, alloc.dynamic);
+ debugl("RUN PARSER");
+
+ var res = try parser.parse();
+ ast = res.ast;
+ var symbols: SymbolList = &([_][]Symbol{ast.symbols});
+ var symbol_map = js_ast.Symbol.Map.initList(symbols);
+
+ if (log.msgs.items.len > 0) {
+ debugl("PRINT LOG ERRORS");
+ var fixedBuffer = [_]u8{0} ** 4096;
+ var stream = std.io.fixedBufferStream(&fixedBuffer);
+
+ try log.print(stream.writer());
+ std.debug.print("{s}", .{fixedBuffer});
+ }
+ var linker = Linker{};
+ debugl("START AST PRINT");
+
+ if (PRINT_AST) {
+ var fixed_buffer = [_]u8{0} ** 512000;
+ var buf_stream = std.io.fixedBufferStream(&fixed_buffer);
+ try ast.toJSON(alloc.dynamic, std.io.getStdErr().writer());
+ }
+
+ const result = js_printer.printAst(alloc.dynamic, ast, symbol_map, true, js_printer.Options{ .to_module_ref = res.ast.module_ref orelse Ref{ .inner_index = 0 } }, &linker) catch unreachable;
+ var copied = try std.mem.dupe(alloc.dynamic, u8, result.js);
+ _ = t.expect(contents, copied, src);
+ // std.testing.expectEqualStrings(contents, copied);
+}
+
+const PRINT_AST = false;
+
+test "expectPrint" {
+ var t_ = Tester.t(std.heap.page_allocator);
+ var t = &t_;
+
+ try expectPrinted(t, "(-x) ** 2", "(-x) ** 2;\n", @src());
+ try expectPrinted(t, "(+x) ** 2", "(+x) ** 2;\n", @src());
+ try expectPrinted(t, "(~x) ** 2", "(~x) ** 2;\n", @src());
+ try expectPrinted(t, "(!x) ** 2", "(!x) ** 2;\n", @src());
+ try expectPrinted(t, "(-1) ** 2", "(-1) ** 2;\n", @src());
+ try expectPrinted(t, "(+1) ** 2", "1 ** 2;\n", @src());
+ try expectPrinted(t, "(~1) ** 2", "(~1) ** 2;\n", @src());
+ try expectPrinted(t, "(!1) ** 2", "false ** 2;\n", @src());
+ try expectPrinted(t, "(void x) ** 2", "(void x) ** 2;\n", @src());
+ try expectPrinted(t, "(delete x) ** 2", "(delete x) ** 2;\n", @src());
+ try expectPrinted(t, "(typeof x) ** 2", "(typeof x) ** 2;\n", @src());
+ try expectPrinted(t, "undefined ** 2", "(void 0) ** 2;\n", @src());
+
+ try expectPrinted(t, "class Foo { foo() {} }", "class Foo {\n foo() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { *foo() {} }", "class Foo {\n *foo() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { get foo() {} }", "class Foo {\n get foo() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { set foo(x) {} }", "class Foo {\n set foo(x) {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static foo() {} }", "class Foo {\n static foo() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static *foo() {} }", "class Foo {\n static *foo() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static get foo() {} }", "class Foo {\n static get foo() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static set foo(x) {} }", "class Foo {\n static set foo(x) {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { async foo() {} }", "class Foo {\n async foo() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static async foo() {} }", "class Foo {\n static async foo() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static async *foo() {} }", "class Foo {\n static async *foo() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static async *foo() {}\n hey = true; }", "class Foo {\n static async *foo() {\n }\n hey = true;\n}\n", @src());
+
+ try expectPrinted(t, "class Foo { if() {} }", "class Foo {\n if() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { *if() {} }", "class Foo {\n *if() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { get if() {} }", "class Foo {\n get if() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { set if(x) {} }", "class Foo {\n set if(x) {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static if() {} }", "class Foo {\n static if() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static *if() {} }", "class Foo {\n static *if() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static get if() {} }", "class Foo {\n static get if() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static set if(x) {} }", "class Foo {\n static set if(x) {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { async if() {} }", "class Foo {\n async if() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static async if() {} }", "class Foo {\n static async if() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static async *if() {} }", "class Foo {\n static async *if() {\n }\n}\n", @src());
+
+ try expectPrinted(t, "class Foo { a() {} b() {} }", "class Foo {\n a() {\n }\n b() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { a() {} get b() {} }", "class Foo {\n a() {\n }\n get b() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { a() {} set b(x) {} }", "class Foo {\n a() {\n }\n set b(x) {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { a() {} static b() {} }", "class Foo {\n a() {\n }\n static b() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { a() {} static *b() {} }", "class Foo {\n a() {\n }\n static *b() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { a() {} static get b() {} }", "class Foo {\n a() {\n }\n static get b() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { a() {} static set b(x) {} }", "class Foo {\n a() {\n }\n static set b(x) {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { a() {} async b() {} }", "class Foo {\n a() {\n }\n async b() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { a() {} static async b() {} }", "class Foo {\n a() {\n }\n static async b() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { a() {} static async *b() {} }", "class Foo {\n a() {\n }\n static async *b() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { [arguments] }", "class Foo {\n [arguments];\n}\n", @src());
+ try expectPrinted(t, "class Foo { [arguments] = 1 }", "class Foo {\n [arguments] = 1;\n}\n", @src());
+ try expectPrinted(t, "class Foo { arguments = 1 }", "class Foo {\n arguments = 1;\n}\n", @src());
+ try expectPrinted(t, "class Foo { x = class { arguments = 1 } }", "class Foo {\n x = class {\n arguments = 1;\n };\n}\n", @src());
+ try expectPrinted(t, "class Foo { x = function() { arguments } }", "class Foo {\n x = function() {\n arguments;\n };\n}\n", @src());
+ try expectPrinted(t, "class Foo { get ['constructor']() {} }", "class Foo {\n get [\"constructor\"]() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { set ['constructor'](x) {} }", "class Foo {\n set [\"constructor\"](x) {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { *['constructor']() {} }", "class Foo {\n *[\"constructor\"]() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { async ['constructor']() {} }", "class Foo {\n async [\"constructor\"]() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { async *['constructor']() {} }", "class Foo {\n async *[\"constructor\"]() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { get prototype() {} }", "class Foo {\n get prototype() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { get 'prototype'() {} }", "class Foo {\n get prototype() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { set prototype(x) {} }", "class Foo {\n set prototype(x) {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { set 'prototype'(x) {} }", "class Foo {\n set prototype(x) {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { *prototype() {} }", "class Foo {\n *prototype() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { *'prototype'() {} }", "class Foo {\n *prototype() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { async prototype() {} }", "class Foo {\n async prototype() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { async 'prototype'() {} }", "class Foo {\n async prototype() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { async *prototype() {} }", "class Foo {\n async *prototype() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { async *'prototype'() {} }", "class Foo {\n async *prototype() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static get ['prototype']() {} }", "class Foo {\n static get [\"prototype\"]() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static set ['prototype'](x) {} }", "class Foo {\n static set [\"prototype\"](x) {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static *['prototype']() {} }", "class Foo {\n static *[\"prototype\"]() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static async ['prototype']() {} }", "class Foo {\n static async [\"prototype\"]() {\n }\n}\n", @src());
+ try expectPrinted(t, "class Foo { static async *['prototype']() {} }", "class Foo {\n static async *[\"prototype\"]() {\n }\n}\n", @src());
+ try expectPrinted(t, "({ prototype: 1 })", "({prototype: 1});\n", @src());
+ try expectPrinted(t, "({ get prototype() {} })", "({get prototype() {\n}});\n", @src());
+ try expectPrinted(t, "({ set prototype(x) {} })", "({set prototype(x) {\n}});\n", @src());
+ try expectPrinted(t, "({ *prototype() {} })", "({*prototype() {\n}});\n", @src());
+ try expectPrinted(t, "({ async prototype() {} })", "({async prototype() {\n}});\n", @src());
+ try expectPrinted(t, "({ async* prototype() {} })", "({async *prototype() {\n}});\n", @src());
+ // try expectPrinted(t, "class Foo extends Bar { constructor() { super() } }", "class Foo extends Bar {\n constructor() {\n super();\n }\n}\n", @src());
+ // try expectPrinted(t, "class Foo extends Bar { constructor() { () => super() } }", "class Foo extends Bar {\n constructor() {\n () => super();\n }\n}\n", @src());
+ // try expectPrinted(t, "class Foo extends Bar { constructor() { () => { super() } } }", "class Foo extends Bar {\n constructor() {\n () => {\n super();\n };\n }\n}\n", @src());
+ // try expectPrinted(t, "class Foo extends Bar { constructor(x = super()) {} }", "class Foo extends Bar {\n constructor(x = super()) {\n }\n}\n", @src());
+ // try expectPrinted(t, "class Foo extends Bar { constructor(x = () => super()) {} }", "class Foo extends Bar {\n constructor(x = () => super()) {\n }\n}\n", @src());
+ // try expectPrinted(t, "({foo})", "({foo});\n", @src());
+ // try expectPrinted(t, "({foo:0})", "({foo: 0});\n", @src());
+ // try expectPrinted(t, "({1e9:0})", "({1e9: 0});\n", @src());
+ // try expectPrinted(t, "({1_2_3n:0})", "({123n: 0});\n", @src());
+ // try expectPrinted(t, "({0x1_2_3n:0})", "({0x123n: 0});\n", @src());
+ // try expectPrinted(t, "({foo() {}})", "({foo() {\n}});\n", @src());
+ // try expectPrinted(t, "({*foo() {}})", "({*foo() {\n}});\n", @src());
+ // try expectPrinted(t, "({get foo() {}})", "({get foo() {\n}});\n", @src());
+ // try expectPrinted(t, "({set foo(x) {}})", "({set foo(x) {\n}});\n", @src());
+
+ // try expectPrinted(t, "({if:0})", "({if: 0});\n", @src());
+ // try expectPrinted(t, "({if() {}})", "({if() {\n}});\n", @src());
+ // try expectPrinted(t, "({*if() {}})", "({*if() {\n}});\n", @src());
+ // try expectPrinted(t, "({get if() {}})", "({get if() {\n}});\n", @src());
+ // try expectPrinted(t, "({set if(x) {}})", "({set if(x) {\n}});\n", @src());
+
+ // try expectPrinted(t, "await x", "await x;\n", @src());
+ // try expectPrinted(t, "await +x", "await +x;\n", @src());
+ // try expectPrinted(t, "await -x", "await -x;\n", @src());
+ // try expectPrinted(t, "await ~x", "await ~x;\n", @src());
+ // try expectPrinted(t, "await !x", "await !x;\n", @src());
+ // try expectPrinted(t, "await --x", "await --x;\n", @src());
+ // try expectPrinted(t, "await ++x", "await ++x;\n", @src());
+ // try expectPrinted(t, "await x--", "await x--;\n", @src());
+ // try expectPrinted(t, "await x++", "await x++;\n", @src());
+ // try expectPrinted(t, "await void x", "await void x;\n", @src());
+ // try expectPrinted(t, "await typeof x", "await typeof x;\n", @src());
+ // try expectPrinted(t, "await (x * y)", "await (x * y);\n", @src());
+ // try expectPrinted(t, "await (x ** y)", "await (x ** y);\n", @src());
+
+ t.report(@src());
+}
diff --git a/src/js_printer.zig b/src/js_printer.zig
index 50114e670..e6cbb85a4 100644
--- a/src/js_printer.zig
+++ b/src/js_printer.zig
@@ -1568,7 +1568,7 @@ pub fn NewPrinter(comptime ascii_only: bool) type {
}
},
else => {
- std.debug.panic("Unexpected expression of type {s}", .{expr.data});
+ // std.debug.panic("Unexpected expression of type {s}", .{std.meta.activeTag(expr.data});
},
}
}
@@ -1630,13 +1630,15 @@ pub fn NewPrinter(comptime ascii_only: bool) type {
switch (val.data) {
.e_function => |func| {
if (item.flags.is_method) {
- p.printSpaceBeforeIdentifier();
- p.print("set");
- p.printSpace();
- }
+ if (func.func.flags.is_async) {
+ p.printSpaceBeforeIdentifier();
+ p.print("async");
+ p.printSpace();
+ }
- if (func.func.flags.is_generator) {
- p.print("*");
+ if (func.func.flags.is_generator) {
+ p.print("*");
+ }
}
},
else => {},
diff --git a/src/main.zig b/src/main.zig
index d67ba6167..62e6ea0ae 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -26,7 +26,6 @@ pub fn main() anyerror!void {
try alloc.setup(std.heap.page_allocator);
var log = logger.Log.init(alloc.dynamic);
var panicker = MainPanicHandler.init(&log);
- panicker.skip_next_panic = true;
MainPanicHandler.Singleton = &panicker;
const args = try std.process.argsAlloc(alloc.dynamic);
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-05 04:43:01 +0000