400 lines
11 KiB
JavaScript
400 lines
11 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const Source = require("./Source");
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const streamAndGetSourceAndMap = require("./helpers/streamAndGetSourceAndMap");
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const streamChunksOfRawSource = require("./helpers/streamChunksOfRawSource");
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const streamChunksOfSourceMap = require("./helpers/streamChunksOfSourceMap");
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const {
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isDualStringBufferCachingEnabled,
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} = require("./helpers/stringBufferUtils");
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/** @typedef {import("./Source").HashLike} HashLike */
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/** @typedef {import("./Source").MapOptions} MapOptions */
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/** @typedef {import("./Source").RawSourceMap} RawSourceMap */
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/** @typedef {import("./Source").SourceAndMap} SourceAndMap */
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/** @typedef {import("./Source").SourceValue} SourceValue */
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/** @typedef {import("./helpers/getGeneratedSourceInfo").GeneratedSourceInfo} GeneratedSourceInfo */
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/** @typedef {import("./helpers/streamChunks").OnChunk} OnChunk */
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/** @typedef {import("./helpers/streamChunks").OnName} OnName */
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/** @typedef {import("./helpers/streamChunks").OnSource} OnSource */
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/** @typedef {import("./helpers/streamChunks").Options} Options */
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/**
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* @typedef {object} BufferedMap
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* @property {number} version version
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* @property {string[]} sources sources
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* @property {string[]} names name
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* @property {string=} sourceRoot source root
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* @property {(Buffer | "")[]=} sourcesContent sources content
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* @property {Buffer=} mappings mappings
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* @property {string} file file
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*/
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/**
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* @param {null | RawSourceMap} map map
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* @returns {null | BufferedMap} buffered map
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*/
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const mapToBufferedMap = (map) => {
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if (typeof map !== "object" || !map) return map;
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const bufferedMap =
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/** @type {BufferedMap} */
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(/** @type {unknown} */ ({ ...map }));
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if (map.mappings) {
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bufferedMap.mappings = Buffer.from(map.mappings, "utf8");
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}
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if (map.sourcesContent) {
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bufferedMap.sourcesContent = map.sourcesContent.map(
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(str) => str && Buffer.from(str, "utf8"),
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);
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}
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return bufferedMap;
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};
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/**
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* @param {null | BufferedMap} bufferedMap buffered map
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* @returns {null | RawSourceMap} map
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*/
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const bufferedMapToMap = (bufferedMap) => {
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if (typeof bufferedMap !== "object" || !bufferedMap) return bufferedMap;
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const map =
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/** @type {RawSourceMap} */
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(/** @type {unknown} */ ({ ...bufferedMap }));
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if (bufferedMap.mappings) {
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map.mappings = bufferedMap.mappings.toString("utf8");
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}
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if (bufferedMap.sourcesContent) {
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map.sourcesContent = bufferedMap.sourcesContent.map(
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(buffer) => buffer && buffer.toString("utf8"),
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);
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}
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return map;
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};
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/** @typedef {{ map?: null | RawSourceMap, bufferedMap?: null | BufferedMap }} BufferEntry */
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/** @typedef {Map<string, BufferEntry>} BufferedMaps */
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/**
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* @typedef {object} CachedData
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* @property {boolean=} source source
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* @property {Buffer} buffer buffer
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* @property {number=} size size
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* @property {BufferedMaps} maps maps
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* @property {(string | Buffer)[]=} hash hash
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*/
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class CachedSource extends Source {
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/**
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* @param {Source | (() => Source)} source source
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* @param {CachedData=} cachedData cached data
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*/
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constructor(source, cachedData) {
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super();
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this._source = source;
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this._cachedSourceType = cachedData ? cachedData.source : undefined;
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/**
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* @private
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* @type {undefined | string}
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*/
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this._cachedSource = undefined;
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this._cachedBuffer = cachedData ? cachedData.buffer : undefined;
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this._cachedSize = cachedData ? cachedData.size : undefined;
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/**
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* @private
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* @type {BufferedMaps}
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*/
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this._cachedMaps = cachedData ? cachedData.maps : new Map();
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this._cachedHashUpdate = cachedData ? cachedData.hash : undefined;
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}
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/**
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* @returns {CachedData} cached data
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*/
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getCachedData() {
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/** @type {BufferedMaps} */
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const bufferedMaps = new Map();
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for (const pair of this._cachedMaps) {
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const [, cacheEntry] = pair;
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if (cacheEntry.bufferedMap === undefined) {
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cacheEntry.bufferedMap = mapToBufferedMap(
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this._getMapFromCacheEntry(cacheEntry),
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);
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}
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bufferedMaps.set(pair[0], {
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map: undefined,
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bufferedMap: cacheEntry.bufferedMap,
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});
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}
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return {
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// We don't want to cache strings
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// So if we have a caches sources
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// create a buffer from it and only store
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// if it was a Buffer or string
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buffer: this._cachedSource
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? this.buffer()
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: /** @type {Buffer} */ (this._cachedBuffer),
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source:
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this._cachedSourceType !== undefined
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? this._cachedSourceType
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: typeof this._cachedSource === "string"
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? true
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: Buffer.isBuffer(this._cachedSource)
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? false
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: undefined,
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size: this._cachedSize,
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maps: bufferedMaps,
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hash: this._cachedHashUpdate,
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};
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}
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originalLazy() {
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return this._source;
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}
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original() {
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if (typeof this._source === "function") this._source = this._source();
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return this._source;
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}
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/**
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* @returns {SourceValue} source
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*/
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source() {
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const source = this._getCachedSource();
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if (source !== undefined) return source;
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return (this._cachedSource =
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/** @type {string} */
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(this.original().source()));
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}
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/**
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* @private
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* @param {BufferEntry} cacheEntry cache entry
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* @returns {null | RawSourceMap} raw source map
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*/
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_getMapFromCacheEntry(cacheEntry) {
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if (cacheEntry.map !== undefined) {
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return cacheEntry.map;
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} else if (cacheEntry.bufferedMap !== undefined) {
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return (cacheEntry.map = bufferedMapToMap(cacheEntry.bufferedMap));
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}
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return null;
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}
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/**
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* @private
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* @returns {undefined | string} cached source
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*/
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_getCachedSource() {
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if (this._cachedSource !== undefined) return this._cachedSource;
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if (this._cachedBuffer && this._cachedSourceType !== undefined) {
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const value = this._cachedSourceType
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? this._cachedBuffer.toString("utf8")
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: this._cachedBuffer;
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if (isDualStringBufferCachingEnabled()) {
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this._cachedSource = /** @type {string} */ (value);
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}
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return /** @type {string} */ (value);
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}
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}
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/**
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* @returns {Buffer} buffer
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*/
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buffer() {
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if (this._cachedBuffer !== undefined) return this._cachedBuffer;
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if (this._cachedSource !== undefined) {
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const value = Buffer.isBuffer(this._cachedSource)
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? this._cachedSource
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: Buffer.from(this._cachedSource, "utf8");
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if (isDualStringBufferCachingEnabled()) {
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this._cachedBuffer = value;
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}
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return value;
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}
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if (typeof this.original().buffer === "function") {
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return (this._cachedBuffer = this.original().buffer());
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}
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const bufferOrString = this.source();
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if (Buffer.isBuffer(bufferOrString)) {
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return (this._cachedBuffer = bufferOrString);
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}
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const value = Buffer.from(bufferOrString, "utf8");
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if (isDualStringBufferCachingEnabled()) {
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this._cachedBuffer = value;
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}
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return value;
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}
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/**
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* @returns {number} size
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*/
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size() {
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if (this._cachedSize !== undefined) return this._cachedSize;
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if (this._cachedBuffer !== undefined) {
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return (this._cachedSize = this._cachedBuffer.length);
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}
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const source = this._getCachedSource();
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if (source !== undefined) {
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return (this._cachedSize = Buffer.byteLength(source));
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}
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return (this._cachedSize = this.original().size());
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}
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/**
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* @param {MapOptions=} options map options
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* @returns {SourceAndMap} source and map
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*/
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sourceAndMap(options) {
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const key = options ? JSON.stringify(options) : "{}";
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const cacheEntry = this._cachedMaps.get(key);
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// Look for a cached map
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if (cacheEntry !== undefined) {
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// We have a cached map in some representation
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const map = this._getMapFromCacheEntry(cacheEntry);
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// Either get the cached source or compute it
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return { source: this.source(), map };
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}
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// Look for a cached source
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let source = this._getCachedSource();
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// Compute the map
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let map;
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if (source !== undefined) {
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map = this.original().map(options);
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} else {
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// Compute the source and map together.
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const sourceAndMap = this.original().sourceAndMap(options);
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source = /** @type {string} */ (sourceAndMap.source);
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map = sourceAndMap.map;
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this._cachedSource = source;
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}
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this._cachedMaps.set(key, {
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map,
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bufferedMap: undefined,
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});
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return { source, map };
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}
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/**
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* @param {Options} options options
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* @param {OnChunk} onChunk called for each chunk of code
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* @param {OnSource} onSource called for each source
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* @param {OnName} onName called for each name
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* @returns {GeneratedSourceInfo} generated source info
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*/
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streamChunks(options, onChunk, onSource, onName) {
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const key = options ? JSON.stringify(options) : "{}";
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if (
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this._cachedMaps.has(key) &&
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(this._cachedBuffer !== undefined || this._cachedSource !== undefined)
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) {
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const { source, map } = this.sourceAndMap(options);
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if (map) {
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return streamChunksOfSourceMap(
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/** @type {string} */
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(source),
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map,
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onChunk,
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onSource,
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onName,
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Boolean(options && options.finalSource),
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true,
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);
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}
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return streamChunksOfRawSource(
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/** @type {string} */
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(source),
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onChunk,
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onSource,
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onName,
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Boolean(options && options.finalSource),
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);
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}
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const sourceAndMap = streamAndGetSourceAndMap(
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this.original(),
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options,
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onChunk,
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onSource,
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onName,
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);
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this._cachedSource = sourceAndMap.source;
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this._cachedMaps.set(key, {
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map: /** @type {RawSourceMap} */ (sourceAndMap.map),
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bufferedMap: undefined,
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});
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return sourceAndMap.result;
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}
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/**
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* @param {MapOptions=} options map options
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* @returns {RawSourceMap | null} map
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*/
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map(options) {
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const key = options ? JSON.stringify(options) : "{}";
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const cacheEntry = this._cachedMaps.get(key);
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if (cacheEntry !== undefined) {
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return this._getMapFromCacheEntry(cacheEntry);
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}
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const map = this.original().map(options);
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this._cachedMaps.set(key, {
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map,
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bufferedMap: undefined,
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});
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return map;
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}
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/**
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* @param {HashLike} hash hash
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* @returns {void}
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*/
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updateHash(hash) {
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if (this._cachedHashUpdate !== undefined) {
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for (const item of this._cachedHashUpdate) hash.update(item);
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return;
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}
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/** @type {(string | Buffer)[]} */
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const update = [];
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/** @type {string | undefined} */
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let currentString;
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const tracker = {
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/**
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* @param {string | Buffer} item item
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* @returns {void}
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*/
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update: (item) => {
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if (typeof item === "string" && item.length < 10240) {
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if (currentString === undefined) {
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currentString = item;
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} else {
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currentString += item;
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if (currentString.length > 102400) {
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update.push(Buffer.from(currentString));
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currentString = undefined;
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}
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}
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} else {
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if (currentString !== undefined) {
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update.push(Buffer.from(currentString));
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currentString = undefined;
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}
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update.push(item);
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}
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},
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};
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this.original().updateHash(/** @type {HashLike} */ (tracker));
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if (currentString !== undefined) {
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update.push(Buffer.from(currentString));
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}
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for (const item of update) hash.update(item);
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this._cachedHashUpdate = update;
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}
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}
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module.exports = CachedSource;
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