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25771x 25771x 25771x 87x 87x 1x 1x 87x 1x 87x 85x 85x 86x 87x 87x 87x 25684x 25684x 25684x 25771x 3796x 3796x 3796x 3796x 3796x 3796x 3551x 8293x 8293x 3551x 3551x 3551x 3551x 245x 3796x 573x 573x 245x 3796x 3796x 3796x 21888x 21888x 21888x 25771x 201x 201x 201x 201x 201x 201x 201x 201x 201x 201x 201x 201x 201x 201x 21687x 21687x 21687x 21687x 21687x 21687x 21687x 21687x 21687x 21688x 21688x 21687x 21687x 21687x 21687x 21687x 21687x 25771x | /**
* @file parseModule.js
* @description Reads an ES module's shape: what it imports, what it exports,
* and where its top-level statements sit.
*
* ## Scope, stated up front
*
* This is a *module-structure* reader, not an ECMAScript parser. It answers
* exactly the questions the bundler asks:
*
* - which specifiers does this module depend on, and under what local names?
* - which names does it export, and where does each one come from?
* - where does each top-level statement begin and end, and what does it declare?
*
* Everything between those declarations is opaque text that the emitter copies
* verbatim. That is deliberate: the less of JavaScript the bundler claims to
* understand, the fewer ways it can silently miscompile a module. Where a
* construct is outside what the reader can describe, it says so
* ({@link ModuleParseError}) and the build fails with a location — the same
* house rule the compiler follows everywhere else.
*
* Import and export declarations are only legal at the top level of a module,
* so scanning for them at bracket depth zero, skipping every string, template,
* regex and comment via {@link module:lib/bundler/scanner}, finds all of them
* and nothing else.
* @module lib/bundler/parseModule
*/
import { CodeMask, statementEnd, matchBracket } from './scanner.js';
import { LruCache } from '../core/utils/LruCache.js';
/**
* Module records by source text.
*
* Reading a module is a pure function of its source -- the file name is used
* only in diagnostics -- so the same text always yields the same record. That
* matters because the runtime's modules are re-read on every build, and
* `avenx watch` rebuilds on every keystroke: without this, a watch rebuild
* re-parsed seventy modules that had not changed. Bounded, because a long
* watch session should not accumulate every version of every file a developer
* has typed.
* @type {LruCache}
*/
const recordCache = new LruCache(400);
/**
* Raised when a module contains structure the reader cannot describe.
*/
export class ModuleParseError extends Error {
/**
* @param {string} message - What could not be read.
* @param {string} file - The module's path or virtual id.
* @param {number} [index] - Character offset in the module.
*/
constructor(message, file, index = -1) {
super(message);
this.name = 'ModuleParseError';
/** @type {string} */
this.file = file;
/** @type {number} */
this.index = index;
}
}
/**
* Declaration keywords that introduce a binding at the top level.
* @type {Set<string>}
*/
const BINDING_KEYWORDS = new Set(['const', 'let', 'var', 'function', 'class', 'async']);
/**
* Splits a `{ a, b as c }` clause into binding pairs.
* @param {string} inner - The text between the braces.
* @returns {Array<{imported: string, local: string}>} The bindings, in order.
*/
function parseNamedClause(inner) {
return inner
.split(',')
.map((part) => part.trim())
.filter(Boolean)
.map((part) => {
const aliased = part.split(/\s+as\s+/);
const imported = aliased[0].trim().replace(/^["']|["']$/g, '');
const local = (aliased[1] || aliased[0]).trim();
return { imported, local };
});
}
/**
* Reads the names a top-level declaration introduces.
*
* Handles `const`/`let`/`var` (including object and array destructuring
* patterns), `function`, `async function`, `function*` and `class`. Anything
* else — an expression statement, a bare call — declares nothing, which is the
* correct answer rather than a failure.
* @param {string} text - The statement source.
* @returns {string[]} Declared binding names.
*/
export function declaredNames(text) {
const trimmed = text.replace(/^\s*export\s+default\s+/, '').replace(/^\s*export\s+/, '').trimStart();
const fn = trimmed.match(/^(?:async\s+)?function\s*\*?\s*([A-Za-z_$][\w$]*)/);
if (fn) return [fn[1]];
const cls = trimmed.match(/^class\s+([A-Za-z_$][\w$]*)/);
if (cls) return [cls[1]];
const decl = trimmed.match(/^(const|let|var)\s+/);
if (!decl) return [];
const names = [];
const body = trimmed.slice(decl[0].length);
const mask = new CodeMask(body);
let i = 0;
let expectName = true;
while (i < body.length) {
if (!mask.isCode(i)) {
i += 1;
continue;
}
const char = body[i];
if (char === '{' || char === '[') {
// A destructuring pattern. Every identifier that is not a property key
// and not a default value is a binding; taking the identifier after each
// `:` (and each bare identifier otherwise) covers the shapes that appear
// in practice.
const end = matchBracket(body, mask, i);
const pattern = body.slice(i + 1, end - 1);
const patternMask = new CodeMask(pattern);
let inner = 0;
let assigned = false;
let token = '';
let pendingKey = false;
const push = (name) => {
if (name && /^[A-Za-z_$][\w$]*$/.test(name) && !names.includes(name)) names.push(name);
};
for (let k = 0; k <= pattern.length; k += 1) {
const ch = k < pattern.length ? pattern[k] : ',';
const isCode = k < pattern.length ? patternMask.isCode(k) : true;
if (!isCode) continue;
if (ch === '{' || ch === '[' || ch === '(') inner += 1;
else if (ch === '}' || ch === ']' || ch === ')') inner -= 1;
if (inner === 0 && ch === ':') {
token = '';
pendingKey = true;
continue;
}
if (inner === 0 && ch === '=') {
assigned = true;
continue;
}
if (inner === 0 && ch === ',') {
if (!assigned || pendingKey || token) push(token.trim());
token = '';
assigned = false;
pendingKey = false;
continue;
}
if (!assigned) token += ch;
}
i = end;
expectName = false;
continue;
}
if (char === '(') {
i = matchBracket(body, mask, i);
continue;
}
if (char === '=' && body[i + 1] !== '=') {
// Skip the initialiser: everything up to the next top-level comma.
let j = i + 1;
let d = 0;
while (j < body.length) {
if (!mask.isCode(j)) {
j += 1;
continue;
}
const c = body[j];
if (c === '(' || c === '[' || c === '{') d += 1;
else if (c === ')' || c === ']' || c === '}') d -= 1;
else if (c === ',' && d === 0) break;
else if (c === ';' && d === 0) break;
j += 1;
}
i = j;
continue;
}
if (char === ',') {
expectName = true;
i += 1;
continue;
}
if (expectName && /[A-Za-z_$]/.test(char)) {
let j = i;
while (j < body.length && /[\w$]/.test(body[j])) j += 1;
const name = body.slice(i, j);
if (!names.includes(name)) names.push(name);
expectName = false;
i = j;
continue;
}
if (char === ';') break;
i += 1;
}
return names;
}
/**
* The structure of one ES module.
* @typedef {object} ModuleRecord
* @property {string} source - The original source text.
* @property {string} file - Path or virtual id, for diagnostics.
* @property {Array<object>} imports - Import declarations, in source order.
* @property {Array<object>} exports - Names this module exports from its own scope.
* @property {Array<object>} reExports - `export { x } from 'm'` entries.
* @property {Array<object>} starReExports - `export * from 'm'` entries.
* @property {Array<object>} statements - Top-level statements with their spans.
* @property {Array<object>} dynamicImports - `import('…')` expressions, with spans.
* @property {string[]} dependencies - Distinct specifiers this module needs.
*/
/**
* Reads a module's import/export structure.
* @param {string} source - The module source.
* @param {string} file - Path or virtual id, used in diagnostics.
* @returns {ModuleRecord} The module's structure.
* @throws {ModuleParseError} When a declaration cannot be read.
*/
export function parseModule(source, file) {
const cached = recordCache.get(source);
if (cached) {
// The record is read-only to every consumer; only `file` differs, and it is
// wanted for diagnostics about *this* module.
return cached.file === file ? cached : { ...cached, file };
}
const record = readModule(source, file);
recordCache.set(source, record);
return record;
}
/**
* Reads a module's structure, without the memo.
* @param {string} source - The module source.
* @param {string} file - Path or virtual id, used in diagnostics.
* @returns {ModuleRecord} The module's structure.
* @throws {ModuleParseError} When a declaration cannot be read.
*/
function readModule(source, file) {
const mask = new CodeMask(source);
const text = mask.withoutComments();
/** @type {ModuleRecord} */
const record = {
source,
file,
imports: [],
exports: [],
reExports: [],
starReExports: [],
statements: [],
dynamicImports: [],
dependencies: [],
};
/**
* Reads the `from '...'` tail of a declaration.
* @param {number} from - Offset to start looking at.
* @returns {{specifier: string, end: number}|null} The specifier and where it ends.
*/
const readSpecifier = (from) => {
const rest = text.slice(from);
const match = rest.match(/^\s*from\s*(['"])([^'"]*)\1/);
if (!match) return null;
return { specifier: match[2], end: from + match[0].length };
};
const addDependency = (specifier) => {
if (!record.dependencies.includes(specifier)) {
record.dependencies.push(specifier);
}
};
// `import('./x.js')` is an expression, not a declaration, so it is found by
// scanning rather than by walking statement starts. It is collected because
// ignoring it is the one remaining way a specifier could reach a browser
// unresolved: the emitted bundle is a classic script, so a surviving
// `import()` would request a path that was never written.
const DYNAMIC_IMPORT = /\bimport\s*\(\s*(?:(['"])([^'"]*)\1\s*\))?/g;
let dynamic;
while ((dynamic = DYNAMIC_IMPORT.exec(text)) !== null) {
if (!mask.isCode(dynamic.index)) continue;
if (text.startsWith('import.', dynamic.index)) continue;
if (dynamic[2] === undefined) {
// `import(name)` with a computed specifier. No build-time analysis can
// say what it names, and leaving it in a classic script would request a
// path that was never written -- so it is recorded and reported rather
// than passed through.
record.dynamicImports.push({ specifier: null, start: dynamic.index, end: dynamic.index + dynamic[0].length });
continue;
}
record.dynamicImports.push({
specifier: dynamic[2],
start: dynamic.index,
end: dynamic.index + dynamic[0].length,
});
addDependency(dynamic[2]);
}
let i = 0;
let depth = 0;
while (i < source.length) {
if (!mask.isCode(i)) {
i += 1;
continue;
}
const char = source[i];
if (char === '(' || char === '[' || char === '{') {
depth += 1;
i += 1;
continue;
}
if (char === ')' || char === ']' || char === '}') {
depth -= 1;
i += 1;
continue;
}
if (depth !== 0 || /\s/.test(char) || char === ';') {
i += 1;
continue;
}
// A statement starts here. Identify it, record its span, and move past it.
const word = (text.slice(i).match(/^[A-Za-z_$][\w$]*/) || [''])[0];
if (word === 'import') {
const parsed = readImport(text, mask, i, file);
if (parsed) {
record.imports.push(parsed);
addDependency(parsed.specifier);
record.statements.push({ start: i, end: parsed.end, declares: parsed.locals, kind: 'import' });
i = parsed.end;
continue;
}
// `import(` — a dynamic import expression, not a declaration.
}
if (word === 'export') {
const parsed = readExport(text, mask, i, file, readSpecifier);
for (const entry of parsed.exports) record.exports.push(entry);
for (const entry of parsed.reExports) {
record.reExports.push(entry);
addDependency(entry.specifier);
}
for (const entry of parsed.starReExports) {
record.starReExports.push(entry);
addDependency(entry.specifier);
}
record.statements.push({
start: i,
end: parsed.end,
declares: parsed.declares,
kind: parsed.kind,
exported: parsed.exports.map((entry) => entry.exported),
bodyStart: parsed.bodyStart,
// The entries this particular statement produced. The emitter needs
// them per statement, not per module: two `export { … } from` lines
// naming the same specifier are two separate rewrites.
entries: parsed.exports,
reExportEntries: parsed.reExports,
starSpecifier: parsed.starReExports.length > 0 ? parsed.starReExports[0].specifier : null,
});
i = parsed.end;
continue;
}
const end = statementEnd(source, mask, i);
const statementText = text.slice(i, end);
record.statements.push({
start: i,
end,
declares: BINDING_KEYWORDS.has(word) ? declaredNames(statementText) : [],
kind: 'statement',
});
i = Math.max(end, i + 1);
}
return record;
}
/**
* Reads one `import` declaration.
* @param {string} text - Comment-blanked source.
* @param {CodeMask} mask - Mask for the source.
* @param {number} start - Offset of the `import` keyword.
* @param {string} file - Module path, for diagnostics.
* @returns {object|null} The import record, or null when this is `import(`.
* @throws {ModuleParseError} When the declaration is malformed.
*/
function readImport(text, mask, start, file) {
const rest = text.slice(start);
// `import(` and `import.meta` are expressions, not declarations.
if (/^import\s*[(.]/.test(rest)) {
return null;
}
const bare = rest.match(/^import\s*(['"])([^'"]*)\1\s*;?/);
if (bare) {
return {
specifier: bare[2],
bindings: [],
namespace: null,
defaultLocal: null,
locals: [],
sideEffectOnly: true,
start,
end: start + bare[0].length,
};
}
const clauseMatch = rest.match(/^import\s+([\s\S]*?)\s+from\s*(['"])([^'"]*)\2\s*;?/);
if (!clauseMatch) {
throw new ModuleParseError('could not read this import declaration', file, start);
}
const clause = clauseMatch[1].trim();
const specifier = clauseMatch[3];
const bindings = [];
let namespace = null;
let defaultLocal = null;
const namedIndex = clause.indexOf('{');
const head = (namedIndex === -1 ? clause : clause.slice(0, namedIndex)).replace(/,\s*$/, '').trim();
if (head) {
const starMatch = head.match(/^(?:([A-Za-z_$][\w$]*)\s*,\s*)?\*\s+as\s+([A-Za-z_$][\w$]*)$/);
if (starMatch) {
if (starMatch[1]) defaultLocal = starMatch[1];
namespace = starMatch[2];
} else {
const defaultMatch = head.match(/^([A-Za-z_$][\w$]*)$/);
if (!defaultMatch) {
throw new ModuleParseError(`could not read the import clause "${clause}"`, file, start);
}
defaultLocal = defaultMatch[1];
}
}
if (namedIndex !== -1) {
const close = clause.indexOf('}', namedIndex);
if (close === -1) {
throw new ModuleParseError(`could not read the import clause "${clause}"`, file, start);
}
bindings.push(...parseNamedClause(clause.slice(namedIndex + 1, close)));
}
const locals = bindings.map((entry) => entry.local);
if (namespace) locals.push(namespace);
if (defaultLocal) locals.push(defaultLocal);
return {
specifier,
bindings,
namespace,
defaultLocal,
locals,
sideEffectOnly: false,
start,
end: start + clauseMatch[0].length,
};
}
/**
* Reads one `export` declaration.
* @param {string} text - Comment-blanked source.
* @param {CodeMask} mask - Mask for the source.
* @param {number} start - Offset of the `export` keyword.
* @param {string} file - Module path, for diagnostics.
* @param {function(number): ({specifier: string, end: number}|null)} readSpecifier - Reads a `from` tail.
* @returns {object} What the declaration exports and where it ends.
* @throws {ModuleParseError} When the declaration is malformed.
*/
function readExport(text, mask, start, file, readSpecifier) {
const rest = text.slice(start);
const result = { exports: [], reExports: [], starReExports: [], declares: [], end: start, kind: 'export', bodyStart: start };
// export * from 'm' | export * as ns from 'm'
const star = rest.match(/^export\s*\*\s*(?:as\s+([A-Za-z_$][\w$]*)\s*)?/);
if (star) {
const tail = readSpecifier(start + star[0].length);
if (!tail) {
throw new ModuleParseError('an `export *` declaration needs a `from` clause', file, start);
}
if (star[1]) {
result.reExports.push({ specifier: tail.specifier, imported: '*', exported: star[1] });
} else {
result.starReExports.push({ specifier: tail.specifier });
}
result.kind = 'star-reexport';
result.end = text[tail.end] === ';' ? tail.end + 1 : tail.end;
return result;
}
// export { ... } | export { ... } from 'm'
const braceMatch = rest.match(/^export\s*\{/);
if (braceMatch) {
const open = start + braceMatch[0].length - 1;
const close = matchBracket(text, mask, open);
const clause = parseNamedClause(text.slice(open + 1, close - 1));
const tail = readSpecifier(close);
if (tail) {
for (const entry of clause) {
result.reExports.push({ specifier: tail.specifier, imported: entry.imported, exported: entry.local });
}
result.kind = 'reexport';
result.end = text[tail.end] === ';' ? tail.end + 1 : tail.end;
return result;
}
for (const entry of clause) {
result.exports.push({ exported: entry.local, local: entry.imported, kind: 'binding' });
}
result.kind = 'export-list';
result.end = text[close] === ';' ? close + 1 : close;
return result;
}
// export default ...
const defaultMatch = rest.match(/^export\s+default\s+/);
if (defaultMatch) {
const bodyStart = start + defaultMatch[0].length;
const end = statementEnd(text, mask, bodyStart);
const declared = declaredNames(text.slice(bodyStart, end));
result.exports.push({
exported: 'default',
local: declared[0] || null,
kind: declared.length > 0 ? 'declaration' : 'expression',
});
result.declares = declared;
result.kind = 'export-default';
result.bodyStart = bodyStart;
result.end = end;
return result;
}
// export <declaration>
const declMatch = rest.match(/^export\s+(?=(const|let|var|function|class|async)\b)/);
if (declMatch) {
const bodyStart = start + declMatch[0].length;
const end = statementEnd(text, mask, bodyStart);
const declared = declaredNames(text.slice(bodyStart, end));
if (declared.length === 0) {
throw new ModuleParseError('could not read the names this export declares', file, start);
}
for (const name of declared) {
result.exports.push({ exported: name, local: name, kind: 'declaration' });
}
result.declares = declared;
result.kind = 'export-declaration';
result.bodyStart = bodyStart;
result.end = end;
return result;
}
throw new ModuleParseError('could not read this export declaration', file, start);
}
|