108 lines
3.6 KiB
JavaScript
108 lines
3.6 KiB
JavaScript
import { createRequire } from "node:module";
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import { parse as parseBinding, parseSync as parseSyncBinding } from "./bindings.js";
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import { wrap } from "./wrap.js";
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export { default as visitorKeys } from "../generated/visit/keys.js";
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export { Visitor } from "./visit/index.js";
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export {
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ExportExportNameKind,
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ExportImportNameKind,
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ExportLocalNameKind,
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ImportNameKind,
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ParseResult,
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Severity,
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} from "./bindings.js";
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export { rawTransferSupported } from "./raw-transfer/supported.js";
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const require = createRequire(import.meta.url);
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// Lazily loaded as needed
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let parseSyncRaw = null,
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parseRaw,
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parseSyncLazy = null,
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parseLazy,
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LazyVisitor;
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/**
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* Lazy-load code related to raw transfer.
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* @returns {undefined}
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*/
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function loadRawTransfer() {
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if (parseSyncRaw === null) {
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({ parseSyncRaw, parse: parseRaw } = require("./raw-transfer/eager.js"));
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}
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}
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/**
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* Lazy-load code related to raw transfer lazy deserialization.
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* @returns {undefined}
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*/
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function loadRawTransferLazy() {
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if (parseSyncLazy === null) {
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({ parseSyncLazy, parse: parseLazy, Visitor: LazyVisitor } = require("./raw-transfer/lazy.js"));
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}
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}
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/**
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* Parse JS/TS source synchronously on current thread.
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*
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* @param {string} filename - Filename
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* @param {string} sourceText - Source text of file
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* @param {Object|undefined} options - Parsing options
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* @returns {Object} - Object with property getters for `program`, `module`, `comments`, and `errors`
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* @throws {Error} - If `experimentalRawTransfer` or `experimentalLazy` option is enabled,
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* and raw transfer is not supported on this platform
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*/
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export function parseSync(filename, sourceText, options) {
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if (options?.experimentalRawTransfer) {
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loadRawTransfer();
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return parseSyncRaw(filename, sourceText, options);
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}
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if (options?.experimentalLazy) {
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loadRawTransferLazy();
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return parseSyncLazy(filename, sourceText, options);
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}
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return wrap(parseSyncBinding(filename, sourceText, options));
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}
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/**
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* Parse JS/TS source asynchronously on a separate thread.
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*
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* Note that not all of the workload can happen on a separate thread.
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* Parsing on Rust side does happen in a separate thread, but deserialization of the AST to JS objects
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* has to happen on current thread. This synchronous deserialization work typically outweighs
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* the asynchronous parsing by a factor of between 3 and 20.
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*
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* i.e. the majority of the workload cannot be parallelized by using this method.
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*
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* Generally `parseSync` is preferable to use as it does not have the overhead of spawning a thread.
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* If you need to parallelize parsing multiple files, it is recommended to use worker threads.
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*
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* @param {string} filename - Filename
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* @param {string} sourceText - Source text of file
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* @param {Object|undefined} options - Parsing options
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* @returns {Object} - Object with property getters for `program`, `module`, `comments`, and `errors`
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* @throws {Error} - If `experimentalRawTransfer` or `experimentalLazy` option is enabled,
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* and raw transfer is not supported on this platform
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*/
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export async function parse(filename, sourceText, options) {
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if (options?.experimentalRawTransfer) {
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loadRawTransfer();
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return await parseRaw(filename, sourceText, options);
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}
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if (options?.experimentalLazy) {
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loadRawTransferLazy();
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return await parseLazy(filename, sourceText, options);
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}
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return wrap(await parseBinding(filename, sourceText, options));
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}
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/**
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* Get `Visitor` class to construct visitors with.
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* @returns {function} - `Visitor` class
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*/
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export function experimentalGetLazyVisitor() {
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loadRawTransferLazy();
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return LazyVisitor;
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}
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