/
index.ts
659 lines (597 loc) · 21.8 KB
/
index.ts
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import type { CompileOptions } from '../../@types/compiler';
import type { AstroConfig, ValidExtensionPlugins } from '../../@types/astro';
import type { Ast, Script, Style, TemplateNode } from '../../parser/interfaces';
import type { TransformResult } from '../../@types/astro';
import eslexer from 'es-module-lexer';
import esbuild from 'esbuild';
import path from 'path';
import { walk } from 'estree-walker';
import _babelGenerator from '@babel/generator';
import babelParser from '@babel/parser';
import * as babelTraverse from '@babel/traverse';
import { ImportDeclaration, ExportNamedDeclaration, VariableDeclarator, Identifier } from '@babel/types';
import { warn } from '../../logger.js';
import { fetchContent } from './content.js';
import { isFetchContent, isImportMetaDeclaration } from './utils.js';
import { yellow } from 'kleur/colors';
const traverse: typeof babelTraverse.default = (babelTraverse.default as any).default;
const babelGenerator: typeof _babelGenerator =
// @ts-ignore
_babelGenerator.default;
const { transformSync } = esbuild;
interface Attribute {
start: number;
end: number;
type: 'Attribute';
name: string;
value: TemplateNode[] | boolean;
}
interface CodeGenOptions {
compileOptions: CompileOptions;
filename: string;
fileID: string;
}
/** Format Astro internal import URL */
function internalImport(internalPath: string) {
return `/_astro_internal/${internalPath}`;
}
/** Retrieve attributes from TemplateNode */
function getAttributes(attrs: Attribute[]): Record<string, string> {
let result: Record<string, string> = {};
for (const attr of attrs) {
if (attr.value === true) {
result[attr.name] = JSON.stringify(attr.value);
continue;
}
if (attr.value === false || attr.value === undefined) {
// note: attr.value shouldn’t be `undefined`, but a bad transform would cause a compile error here, so prevent that
continue;
}
if (attr.value.length > 1) {
result[attr.name] =
'(' +
attr.value
.map((v: TemplateNode) => {
if (v.content) {
return v.content;
} else {
return JSON.stringify(getTextFromAttribute(v));
}
})
.join('+') +
')';
continue;
}
const val = attr.value[0];
if (!val) {
result[attr.name] = '(' + val + ')';
continue;
}
switch (val.type) {
case 'MustacheTag': {
result[attr.name] = '(' + val.expression.codeStart + ')';
continue;
}
case 'Text':
result[attr.name] = JSON.stringify(getTextFromAttribute(val));
continue;
default:
throw new Error(`UNKNOWN: ${val.type}`);
}
}
return result;
}
/** Get value from a TemplateNode Attribute (text attributes only!) */
function getTextFromAttribute(attr: any): string {
switch (attr.type) {
case 'Text': {
if (attr.raw !== undefined) {
return attr.raw;
}
if (attr.data !== undefined) {
return attr.data;
}
break;
}
case 'MustacheTag': {
return attr.expression.codeStart;
}
}
throw new Error(`Unknown attribute type ${attr.type}`);
}
/** Convert TemplateNode attributes to string */
function generateAttributes(attrs: Record<string, string>): string {
let result = '{';
for (const [key, val] of Object.entries(attrs)) {
result += JSON.stringify(key) + ':' + val + ',';
}
return result + '}';
}
interface ComponentInfo {
type: string;
url: string;
plugin: string | undefined;
}
const defaultExtensions: Readonly<Record<string, ValidExtensionPlugins>> = {
'.astro': 'astro',
'.jsx': 'react',
'.vue': 'vue',
'.svelte': 'svelte',
};
type DynamicImportMap = Map<'vue' | 'react' | 'react-dom' | 'preact', string>;
interface GetComponentWrapperOptions {
filename: string;
astroConfig: AstroConfig;
dynamicImports: DynamicImportMap;
}
/** Generate Astro-friendly component import */
function getComponentWrapper(_name: string, { type, plugin, url }: ComponentInfo, opts: GetComponentWrapperOptions) {
const { astroConfig, dynamicImports, filename } = opts;
const { astroRoot } = astroConfig;
const [name, kind] = _name.split(':');
const currFileUrl = new URL(`file://${filename}`);
if (!plugin) {
throw new Error(`No supported plugin found for extension ${type}`);
}
const getComponentUrl = (ext = '.js') => {
const outUrl = new URL(url, currFileUrl);
return '/_astro/' + path.posix.relative(astroRoot.pathname, outUrl.pathname).replace(/\.[^.]+$/, ext);
};
switch (plugin) {
case 'astro': {
if (kind) {
throw new Error(`Astro does not support :${kind}`);
}
return {
wrapper: name,
wrapperImport: ``,
};
}
case 'preact': {
if (['load', 'idle', 'visible'].includes(kind)) {
return {
wrapper: `__preact_${kind}(${name}, ${JSON.stringify({
componentUrl: getComponentUrl(),
componentExport: 'default',
frameworkUrls: {
preact: dynamicImports.get('preact'),
},
})})`,
wrapperImport: `import {__preact_${kind}} from '${internalImport('render/preact.js')}';`,
};
}
return {
wrapper: `__preact_static(${name})`,
wrapperImport: `import {__preact_static} from '${internalImport('render/preact.js')}';`,
};
}
case 'react': {
if (['load', 'idle', 'visible'].includes(kind)) {
return {
wrapper: `__react_${kind}(${name}, ${JSON.stringify({
componentUrl: getComponentUrl(),
componentExport: 'default',
frameworkUrls: {
react: dynamicImports.get('react'),
'react-dom': dynamicImports.get('react-dom'),
},
})})`,
wrapperImport: `import {__react_${kind}} from '${internalImport('render/react.js')}';`,
};
}
return {
wrapper: `__react_static(${name})`,
wrapperImport: `import {__react_static} from '${internalImport('render/react.js')}';`,
};
}
case 'svelte': {
if (['load', 'idle', 'visible'].includes(kind)) {
return {
wrapper: `__svelte_${kind}(${name}, ${JSON.stringify({
componentUrl: getComponentUrl('.svelte.js'),
componentExport: 'default',
frameworkUrls: {
'astro/frontend/runtime/svelte': internalImport('runtime/svelte.js'),
},
})})`,
wrapperImport: `import {__svelte_${kind}} from '${internalImport('render/svelte.js')}';`,
};
}
return {
wrapper: `__svelte_static(${name})`,
wrapperImport: `import {__svelte_static} from '${internalImport('render/svelte.js')}';`,
};
}
case 'vue': {
if (['load', 'idle', 'visible'].includes(kind)) {
return {
wrapper: `__vue_${kind}(${name}, ${JSON.stringify({
componentUrl: getComponentUrl('.vue.js'),
componentExport: 'default',
frameworkUrls: {
vue: dynamicImports.get('vue'),
},
})})`,
wrapperImport: `import {__vue_${kind}} from '${internalImport('render/vue.js')}';`,
};
}
return {
wrapper: `__vue_static(${name})`,
wrapperImport: `import {__vue_static} from '${internalImport('render/vue.js')}';`,
};
}
default: {
throw new Error(`Unknown component type`);
}
}
}
/** Evaluate expression (safely) */
function compileExpressionSafe(raw: string): string {
let { code } = transformSync(raw, {
loader: 'tsx',
jsxFactory: 'h',
jsxFragment: 'Fragment',
charset: 'utf8',
});
return code;
}
/** Build dependency map of dynamic component runtime frameworks */
async function acquireDynamicComponentImports(plugins: Set<ValidExtensionPlugins>, resolvePackageUrl: (s: string) => Promise<string>): Promise<DynamicImportMap> {
const importMap: DynamicImportMap = new Map();
for (let plugin of plugins) {
switch (plugin) {
case 'vue': {
importMap.set('vue', await resolvePackageUrl('vue'));
break;
}
case 'react': {
importMap.set('react', await resolvePackageUrl('react'));
importMap.set('react-dom', await resolvePackageUrl('react-dom'));
break;
}
case 'preact': {
importMap.set('preact', await resolvePackageUrl('preact'));
break;
}
}
}
return importMap;
}
type Components = Record<string, { type: string; url: string; plugin: string | undefined }>;
interface CompileResult {
script: string;
componentPlugins: Set<ValidExtensionPlugins>;
createCollection?: string;
}
interface CodegenState {
filename: string;
components: Components;
css: string[];
importExportStatements: Set<string>;
dynamicImports: DynamicImportMap;
}
/** Compile/prepare Astro frontmatter scripts */
function compileModule(module: Script, state: CodegenState, compileOptions: CompileOptions): CompileResult {
const { extensions = defaultExtensions } = compileOptions;
const componentImports: ImportDeclaration[] = [];
const componentProps: VariableDeclarator[] = [];
const componentExports: ExportNamedDeclaration[] = [];
const contentImports = new Map<string, { spec: string; declarator: string }>();
let script = '';
let propsStatement = '';
let contentCode = ''; // code for handling Astro.fetchContent(), if any;
let createCollection = ''; // function for executing collection
const componentPlugins = new Set<ValidExtensionPlugins>();
if (module) {
const program = babelParser.parse(module.content, {
sourceType: 'module',
plugins: ['jsx', 'typescript', 'topLevelAwait'],
}).program;
const { body } = program;
let i = body.length;
while (--i >= 0) {
const node = body[i];
switch (node.type) {
case 'ExportNamedDeclaration': {
if (!node.declaration) break;
// const replacement = extract_exports(node);
if (node.declaration.type === 'VariableDeclaration') {
// case 1: prop (export let title)
const declaration = node.declaration.declarations[0];
if ((declaration.id as Identifier).name === '__layout' || (declaration.id as Identifier).name === '__content') {
componentExports.push(node);
} else {
componentProps.push(declaration);
}
body.splice(i, 1);
} else if (node.declaration.type === 'FunctionDeclaration') {
// case 2: createCollection (export async function)
if (!node.declaration.id || node.declaration.id.name !== 'createCollection') break;
createCollection = module.content.substring(node.declaration.start || 0, node.declaration.end || 0);
// remove node
body.splice(i, 1);
}
break;
}
case 'FunctionDeclaration': {
break;
}
case 'ImportDeclaration': {
componentImports.push(node);
body.splice(i, 1); // remove node
break;
}
case 'VariableDeclaration': {
for (const declaration of node.declarations) {
// only select Astro.fetchContent() calls here. this utility filters those out for us.
if (!isFetchContent(declaration)) continue;
// remove node
body.splice(i, 1);
// a bit of munging
let { id, init } = declaration;
if (!id || !init || id.type !== 'Identifier') continue;
if (init.type === 'AwaitExpression') {
init = init.argument;
const shortname = path.relative(compileOptions.astroConfig.projectRoot.pathname, state.filename);
warn(compileOptions.logging, shortname, yellow('awaiting Astro.fetchContent() not necessary'));
}
if (init.type !== 'CallExpression') continue;
// gather data
const namespace = id.name;
if ((init as any).arguments[0].type !== 'StringLiteral') {
throw new Error(`[Astro.fetchContent] Only string literals allowed, ex: \`Astro.fetchContent('./post/*.md')\`\n ${state.filename}`);
}
const spec = (init as any).arguments[0].value;
if (typeof spec === 'string') contentImports.set(namespace, { spec, declarator: node.kind });
}
break;
}
}
}
for (const componentImport of componentImports) {
const importUrl = componentImport.source.value;
const componentType = path.posix.extname(importUrl);
const specifier = componentImport.specifiers[0];
if (!specifier) continue; // this is unused
// set componentName to default import if used (user), or use filename if no default import (mostly internal use)
const componentName = specifier.type === 'ImportDefaultSpecifier' ? specifier.local.name : path.posix.basename(importUrl, componentType);
const plugin = extensions[componentType] || defaultExtensions[componentType];
state.components[componentName] = {
type: componentType,
plugin,
url: importUrl,
};
if (plugin) {
componentPlugins.add(plugin);
}
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
state.importExportStatements.add(module.content.slice(componentImport.start!, componentImport.end!));
}
for (const componentImport of componentExports) {
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
state.importExportStatements.add(module.content.slice(componentImport.start!, componentImport.end!));
}
if (componentProps.length > 0) {
propsStatement = 'let {';
for (const componentExport of componentProps) {
propsStatement += `${(componentExport.id as Identifier).name}`;
if (componentExport.init) {
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
propsStatement += `= ${babelGenerator(componentExport.init!).code}`;
}
propsStatement += `,`;
}
propsStatement += `} = props;\n`;
}
// handle createCollection, if any
if (createCollection) {
// TODO: improve this? while transforming in-place isn’t great, this happens at most once per-route
const ast = babelParser.parse(createCollection, {
sourceType: 'module',
});
traverse(ast, {
enter({ node }) {
switch (node.type) {
case 'VariableDeclaration': {
for (const declaration of node.declarations) {
// only select Astro.fetchContent() calls here. this utility filters those out for us.
if (!isFetchContent(declaration)) continue;
// a bit of munging
let { id, init } = declaration;
if (!id || !init || id.type !== 'Identifier') continue;
if (init.type === 'AwaitExpression') {
init = init.argument;
const shortname = path.relative(compileOptions.astroConfig.projectRoot.pathname, state.filename);
warn(compileOptions.logging, shortname, yellow('awaiting Astro.fetchContent() not necessary'));
}
if (init.type !== 'CallExpression') continue;
// gather data
const namespace = id.name;
if ((init as any).arguments[0].type !== 'StringLiteral') {
throw new Error(`[Astro.fetchContent] Only string literals allowed, ex: \`Astro.fetchContent('./post/*.md')\`\n ${state.filename}`);
}
const spec = (init as any).arguments[0].value;
if (typeof spec !== 'string') break;
const globResult = fetchContent(spec, { namespace, filename: state.filename });
let imports = '';
for (const importStatement of globResult.imports) {
imports += importStatement + '\n';
}
createCollection =
imports + '\nexport ' + createCollection.substring(0, declaration.start || 0) + globResult.code + createCollection.substring(declaration.end || 0);
}
break;
}
}
},
});
}
// Astro.fetchContent()
for (const [namespace, { spec }] of contentImports.entries()) {
const globResult = fetchContent(spec, { namespace, filename: state.filename });
for (const importStatement of globResult.imports) {
state.importExportStatements.add(importStatement);
}
contentCode += globResult.code;
}
script = propsStatement + contentCode + babelGenerator(program).code;
}
return {
script,
componentPlugins,
createCollection: createCollection || undefined,
};
}
/** Compile styles */
function compileCss(style: Style, state: CodegenState) {
walk(style, {
enter(node: TemplateNode) {
if (node.type === 'Style') {
state.css.push(node.content.styles); // if multiple <style> tags, combine together
this.skip();
}
},
leave(node: TemplateNode) {
if (node.type === 'Style') {
this.remove(); // this will be optimized in a global CSS file; remove so it‘s not accidentally inlined
}
},
});
}
/** Compile page markup */
function compileHtml(enterNode: TemplateNode, state: CodegenState, compileOptions: CompileOptions) {
const { components, css, importExportStatements, dynamicImports, filename } = state;
const { astroConfig } = compileOptions;
let outSource = '';
walk(enterNode, {
enter(node: TemplateNode) {
switch (node.type) {
case 'Expression': {
let child = '';
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
if (node.children!.length) {
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
child = compileHtml(node.children![0], state, compileOptions);
}
let raw = node.codeStart + child + node.codeEnd;
// TODO Do we need to compile this now, or should we compile the entire module at the end?
let code = compileExpressionSafe(raw).trim().replace(/\;$/, '');
outSource += `,(${code})`;
this.skip();
break;
}
case 'MustacheTag':
case 'Comment':
return;
case 'Fragment':
break;
case 'Slot':
case 'Head':
case 'InlineComponent':
case 'Title':
case 'Element': {
const name: string = node.name;
if (!name) {
throw new Error('AHHHH');
}
const attributes = getAttributes(node.attributes);
outSource += outSource === '' ? '' : ',';
if (node.type === 'Slot') {
outSource += `(children`;
return;
}
const COMPONENT_NAME_SCANNER = /^[A-Z]/;
if (!COMPONENT_NAME_SCANNER.test(name)) {
outSource += `h("${name}", ${attributes ? generateAttributes(attributes) : 'null'}`;
return;
}
const [componentName, componentKind] = name.split(':');
const componentImportData = components[componentName];
if (!componentImportData) {
throw new Error(`Unknown Component: ${componentName}`);
}
const { wrapper, wrapperImport } = getComponentWrapper(name, components[componentName], { astroConfig, dynamicImports, filename });
if (wrapperImport) {
importExportStatements.add(wrapperImport);
}
outSource += `h(${wrapper}, ${attributes ? generateAttributes(attributes) : 'null'}`;
return;
}
case 'Attribute': {
this.skip();
return;
}
case 'Style': {
css.push(node.content.styles); // if multiple <style> tags, combine together
this.skip();
return;
}
case 'Text': {
const text = getTextFromAttribute(node);
if (!text.trim()) {
return;
}
outSource += ',' + JSON.stringify(text);
return;
}
default:
throw new Error('Unexpected (enter) node type: ' + node.type);
}
},
leave(node, parent, prop, index) {
switch (node.type) {
case 'Text':
case 'Attribute':
case 'Comment':
case 'Fragment':
case 'Expression':
case 'MustacheTag':
return;
case 'Slot':
case 'Head':
case 'Body':
case 'Title':
case 'Element':
case 'InlineComponent':
outSource += ')';
return;
case 'Style': {
this.remove(); // this will be optimized in a global CSS file; remove so it‘s not accidentally inlined
return;
}
default:
throw new Error('Unexpected (leave) node type: ' + node.type);
}
},
});
return outSource;
}
/**
* Codegen
* Step 3/3 in Astro SSR.
* This is the final pass over a document AST before it‘s converted to an h() function
* and handed off to Snowpack to build.
* @param {Ast} AST The parsed AST to crawl
* @param {object} CodeGenOptions
*/
export async function codegen(ast: Ast, { compileOptions, filename }: CodeGenOptions): Promise<TransformResult> {
await eslexer.init;
const state: CodegenState = {
filename,
components: {},
css: [],
importExportStatements: new Set(),
dynamicImports: new Map(),
};
const { script, componentPlugins, createCollection } = compileModule(ast.module, state, compileOptions);
state.dynamicImports = await acquireDynamicComponentImports(componentPlugins, compileOptions.resolvePackageUrl);
compileCss(ast.css, state);
const html = compileHtml(ast.html, state, compileOptions);
return {
script: script,
imports: Array.from(state.importExportStatements),
html,
css: state.css.length ? state.css.join('\n\n') : undefined,
createCollection,
};
}