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authorGravatar Nate Moore <natemoo-re@users.noreply.github.com> 2021-04-30 16:33:35 -0500
committerGravatar GitHub <noreply@github.com> 2021-04-30 16:33:35 -0500
commit4df1347156cf2632ea2f3475d3a5f8f08d197cc3 (patch)
tree9d50de89dfe62827c32a8a4046120af4ab61dc0c /src/compiler/transform/index.ts
parent1d498facc8f78a3ffbfecd05cc6ecd45e8a4a1ae (diff)
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Migrate to `yarn` monorepo (#157)
* chore: use monorepo * chore: scaffold astro-scripts * chore: move tests inside packages/astro * chore: refactor tests, add scripts * chore: move parser to own module * chore: move runtime to packages/astro * fix: move parser to own package * test: fix prettier-plugin-astro tests * fix: tests * chore: update package-lock * chore: add changesets * fix: cleanup examples * fix: starter example * chore: update changeset config * chore: update changeset config * chore: setup changeset release workflow * chore: bump lockfiles * chore: prism => astro-prism * fix: tsc --emitDeclarationOnly * chore: final cleanup, switch to yarn * chore: add lerna * chore: update workflows to yarn * chore: update workflows * chore: remove lint workflow * chore: add astro-dev script * chore: add symlinked README
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diff --git a/src/compiler/transform/index.ts b/src/compiler/transform/index.ts
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-import type { Ast, TemplateNode } from '../../parser/interfaces';
-import type { NodeVisitor, TransformOptions, Transformer, VisitorFn } from '../../@types/transformer';
-
-import { walk } from 'estree-walker';
-
-// Transformers
-import transformStyles from './styles.js';
-import transformDoctype from './doctype.js';
-import transformModuleScripts from './module-scripts.js';
-import transformCodeBlocks from './prism.js';
-
-interface VisitorCollection {
- enter: Map<string, VisitorFn[]>;
- leave: Map<string, VisitorFn[]>;
-}
-
-/** Add visitors to given collection */
-function addVisitor(visitor: NodeVisitor, collection: VisitorCollection, nodeName: string, event: 'enter' | 'leave') {
- if (typeof visitor[event] !== 'function') return;
- if (!collection[event]) collection[event] = new Map<string, VisitorFn[]>();
-
- const visitors = collection[event].get(nodeName) || [];
- visitors.push(visitor[event] as any);
- collection[event].set(nodeName, visitors);
-}
-
-/** Compile visitor actions from transformer */
-function collectVisitors(transformer: Transformer, htmlVisitors: VisitorCollection, cssVisitors: VisitorCollection, finalizers: Array<() => Promise<void>>) {
- if (transformer.visitors) {
- if (transformer.visitors.html) {
- for (const [nodeName, visitor] of Object.entries(transformer.visitors.html)) {
- addVisitor(visitor, htmlVisitors, nodeName, 'enter');
- addVisitor(visitor, htmlVisitors, nodeName, 'leave');
- }
- }
- if (transformer.visitors.css) {
- for (const [nodeName, visitor] of Object.entries(transformer.visitors.css)) {
- addVisitor(visitor, cssVisitors, nodeName, 'enter');
- addVisitor(visitor, cssVisitors, nodeName, 'leave');
- }
- }
- }
- finalizers.push(transformer.finalize);
-}
-
-/** Utility for formatting visitors */
-function createVisitorCollection() {
- return {
- enter: new Map<string, VisitorFn[]>(),
- leave: new Map<string, VisitorFn[]>(),
- };
-}
-
-/** Walk AST with collected visitors */
-function walkAstWithVisitors(tmpl: TemplateNode, collection: VisitorCollection) {
- walk(tmpl, {
- enter(node, parent, key, index) {
- if (collection.enter.has(node.type)) {
- // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
- const fns = collection.enter.get(node.type)!;
- for (let fn of fns) {
- fn.call(this, node, parent, key, index);
- }
- }
- },
- leave(node, parent, key, index) {
- if (collection.leave.has(node.type)) {
- // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
- const fns = collection.leave.get(node.type)!;
- for (let fn of fns) {
- fn.call(this, node, parent, key, index);
- }
- }
- },
- });
-}
-
-/**
- * Transform
- * Step 2/3 in Astro SSR.
- * Transform is the point at which we mutate the AST before sending off to
- * Codegen, and then to Snowpack. In some ways, it‘s a preprocessor.
- */
-export async function transform(ast: Ast, opts: TransformOptions) {
- const htmlVisitors = createVisitorCollection();
- const cssVisitors = createVisitorCollection();
- const finalizers: Array<() => Promise<void>> = [];
-
- const optimizers = [transformStyles(opts), transformDoctype(opts), transformModuleScripts(opts), transformCodeBlocks(ast.module)];
-
- for (const optimizer of optimizers) {
- collectVisitors(optimizer, htmlVisitors, cssVisitors, finalizers);
- }
-
- walkAstWithVisitors(ast.css, cssVisitors);
- walkAstWithVisitors(ast.html, htmlVisitors);
-
- // Run all of the finalizer functions in parallel because why not.
- await Promise.all(finalizers.map((fn) => fn()));
-}