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const std = @import("std");
const expect = std.testing.expect;
usingnamespace @import("string_types.zig");
pub const MutableString = struct {
allocator: *std.mem.Allocator,
list: std.ArrayListUnmanaged(u8),
pub const Writer = std.io.Writer(*@This(), anyerror, MutableString.writeAll);
pub fn writer(self: *MutableString) Writer {
return Writer{
.context = self,
};
}
pub fn growIfNeeded(self: *MutableString, amount: usize) !void {
const new_capacity = self.list.items.len + amount;
if (self.list.capacity < new_capacity) {
try self.list.ensureCapacity(self.allocator, new_capacity);
}
}
pub fn writeAll(self: *MutableString, bytes: string) !usize {
const new_capacity = self.list.items.len + bytes.len;
try self.list.ensureCapacity(self.allocator, new_capacity);
self.list.appendSliceAssumeCapacity(bytes);
return self.list.items.len;
}
pub fn init(allocator: *std.mem.Allocator, capacity: usize) !MutableString {
return MutableString{ .allocator = allocator, .list = try std.ArrayListUnmanaged(u8).initCapacity(allocator, capacity) };
}
pub fn initCopy(allocator: *std.mem.Allocator, str: anytype) !MutableString {
var mutable = try MutableString.init(allocator, std.mem.len(str));
try mutable.copy(str);
return mutable;
}
// Convert it to an ASCII identifier. Note: If you change this to a non-ASCII
// identifier, you're going to potentially cause trouble with non-BMP code
// points in target environments that don't support bracketed Unicode escapes.
pub fn ensureValidIdentifier(str: string, allocator: *std.mem.Allocator) !string {
if (str.len == 0) {
return "_";
}
var mutable = try MutableString.init(allocator, 0);
var needsGap = false;
for (str) |c| {
if (std.ascii.isLower(c) or std.ascii.isUpper(c) or (mutable.len() > 0 and std.ascii.isAlNum(c))) {
if (needsGap) {
try mutable.appendChar('_');
needsGap = false;
}
try mutable.appendChar(c);
} else if (!needsGap) {
needsGap = true;
}
}
if (mutable.len() > 0) {
return mutable.list.toOwnedSlice(allocator);
} else {
return str;
}
}
pub fn len(self: *MutableString) usize {
return self.list.items.len;
}
pub fn copy(self: *MutableString, str: anytype) !void {
try self.list.ensureCapacity(self.allocator, std.mem.len(str[0..]));
if (self.list.items.len == 0) {
try self.list.insertSlice(self.allocator, 0, str);
} else {
try self.list.replaceRange(self.allocator, 0, std.mem.len(str[0..]), str[0..]);
}
}
pub fn growBy(self: *MutableString, amount: usize) callconv(.Inline) !void {
try self.ensureCapacity(self.list.capacity + amount);
}
pub fn ensureCapacity(self: *MutableString, amount: usize) callconv(.Inline) !void {
try self.list.ensureCapacity(self.allocator, amount);
}
pub fn deinit(self: *MutableString) !void {
self.list.deinit(self.allocator);
}
pub fn appendChar(self: *MutableString, char: u8) callconv(.Inline) !void {
try self.list.append(self.allocator, char);
}
pub fn appendCharAssumeCapacity(self: *MutableString, char: u8) callconv(.Inline) void {
self.list.appendAssumeCapacity(char);
}
pub fn append(self: *MutableString, char: []const u8) callconv(.Inline) !void {
try self.list.appendSlice(self.allocator, char);
}
pub fn appendAssumeCapacity(self: *MutableString, char: []const u8) callconv(.Inline) void {
self.list.appendSliceAssumeCapacity(
char,
);
}
pub fn lenI(self: *MutableString) callconv(.Inline) i32 {
return @intCast(i32, self.list.items.len);
}
pub fn toOwnedSlice(self: *MutableString) string {
return self.list.toOwnedSlice(self.allocator);
}
pub fn toOwnedSliceLength(self: *MutableString, length: usize) string {
self.list.shrinkAndFree(self.allocator, length);
return self.list.toOwnedSlice(self.allocator);
}
// pub fn deleteAt(self: *MutableString, i: usize) {
// self.list.swapRemove(i);
// }
pub fn containsChar(self: *MutableString, char: u8) bool {
return self.indexOfChar(char) != null;
}
pub fn indexOfChar(self: *MutableString, char: u8) ?usize {
return std.mem.indexOfScalar(@TypeOf(char), self.list.items, char);
}
pub fn lastIndexOfChar(self: *MutableString, char: u8) ?usize {
return std.mem.lastIndexOfScalar(@TypeOf(char), self.list.items, char);
}
pub fn lastIndexOf(self: *MutableString, str: u8) ?usize {
return std.mem.lastIndexOf(u8, self.list.items, str);
}
pub fn indexOf(self: *MutableString, str: u8) ?usize {
return std.mem.indexOf(u8, self.list.items, str);
}
pub fn eql(self: *MutableString, other: anytype) bool {
return std.mem.eql(u8, self.list.items, other);
}
};
test "MutableString" {
const alloc = std.heap.page_allocator;
var str = try MutableString.initCopy(alloc, "hello");
expect(str.eql("hello"));
}
test "MutableString.ensureValidIdentifier" {
const alloc = std.heap.page_allocator;
std.testing.expectEqualStrings("jquery", try MutableString.ensureValidIdentifier("jquery", alloc));
std.testing.expectEqualStrings("jquery_foo", try MutableString.ensureValidIdentifier("jquery😋foo", alloc));
}
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