mirror of https://github.com/webpack/webpack.git
287 lines
8.4 KiB
JavaScript
287 lines
8.4 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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*/
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"use strict";
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const RuntimeGlobals = require("../RuntimeGlobals");
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const RuntimeModule = require("../RuntimeModule");
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const Template = require("../Template");
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const { first } = require("../util/SetHelpers");
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/** @typedef {import("../Chunk")} Chunk */
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/** @typedef {import("../Compilation")} Compilation */
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/** @typedef {import("../Compilation").AssetInfo} AssetInfo */
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/** @typedef {import("../Compilation").PathData} PathData */
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/** @typedef {function(PathData, AssetInfo=): string} FilenameFunction */
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class GetChunkFilenameRuntimeModule extends RuntimeModule {
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/**
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* @param {string} contentType the contentType to use the content hash for
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* @param {string} name kind of filename
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* @param {string} global function name to be assigned
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* @param {function(Chunk): string | FilenameFunction} getFilenameForChunk functor to get the filename or function
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* @param {boolean} allChunks when false, only async chunks are included
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*/
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constructor(contentType, name, global, getFilenameForChunk, allChunks) {
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super(`get ${name} chunk filename`);
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this.contentType = contentType;
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this.global = global;
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this.getFilenameForChunk = getFilenameForChunk;
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this.allChunks = allChunks;
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this.dependentHash = true;
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}
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/**
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* @returns {string} runtime code
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*/
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generate() {
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const {
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global,
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chunk,
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chunkGraph,
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contentType,
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getFilenameForChunk,
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allChunks,
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compilation
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} = this;
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const { runtimeTemplate } = compilation;
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/** @type {Map<string | FilenameFunction, Set<Chunk>>} */
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const chunkFilenames = new Map();
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let maxChunks = 0;
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/** @type {string} */
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let dynamicFilename;
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/**
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* @param {Chunk} c the chunk
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* @returns {void}
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*/
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const addChunk = c => {
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const chunkFilename = getFilenameForChunk(c);
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if (chunkFilename) {
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let set = chunkFilenames.get(chunkFilename);
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if (set === undefined) {
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chunkFilenames.set(chunkFilename, (set = new Set()));
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}
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set.add(c);
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if (typeof chunkFilename === "string") {
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if (set.size < maxChunks) return;
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if (set.size === maxChunks) {
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if (chunkFilename.length < dynamicFilename.length) return;
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if (chunkFilename.length === dynamicFilename.length) {
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if (chunkFilename < dynamicFilename) return;
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}
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}
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maxChunks = set.size;
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dynamicFilename = chunkFilename;
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}
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}
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};
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/** @type {string[]} */
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const includedChunksMessages = [];
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if (allChunks) {
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includedChunksMessages.push("all chunks");
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for (const c of chunk.getAllReferencedChunks()) {
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addChunk(c);
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}
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} else {
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includedChunksMessages.push("async chunks");
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for (const c of chunk.getAllAsyncChunks()) {
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addChunk(c);
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}
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const includeEntries = chunkGraph
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.getTreeRuntimeRequirements(chunk)
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.has(RuntimeGlobals.ensureChunkIncludeEntries);
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if (includeEntries) {
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includedChunksMessages.push("sibling chunks for the entrypoint");
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for (const c of chunkGraph.getChunkEntryDependentChunksIterable(
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chunk
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)) {
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addChunk(c);
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}
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}
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}
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for (const entrypoint of chunk.getAllReferencedAsyncEntrypoints()) {
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addChunk(entrypoint.chunks[entrypoint.chunks.length - 1]);
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}
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/** @type {Map<string, Set<string | number>>} */
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const staticUrls = new Map();
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/** @type {Set<Chunk>} */
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const dynamicUrlChunks = new Set();
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/**
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* @param {Chunk} c the chunk
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* @param {string | FilenameFunction} chunkFilename the filename template for the chunk
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* @returns {void}
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*/
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const addStaticUrl = (c, chunkFilename) => {
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/**
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* @param {string | number} value a value
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* @returns {string} string to put in quotes
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*/
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const unquotedStringify = value => {
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const str = `${value}`;
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if (str.length >= 5 && str === `${c.id}`) {
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// This is shorter and generates the same result
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return '" + chunkId + "';
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}
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const s = JSON.stringify(str);
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return s.slice(1, s.length - 1);
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};
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/**
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* @param {string} value string
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* @returns {function(number): string} string to put in quotes with length
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*/
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const unquotedStringifyWithLength = value => length =>
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unquotedStringify(`${value}`.slice(0, length));
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const chunkFilenameValue =
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typeof chunkFilename === "function"
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? JSON.stringify(
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chunkFilename({
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chunk: c,
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contentHashType: contentType
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})
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)
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: JSON.stringify(chunkFilename);
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const staticChunkFilename = compilation.getPath(chunkFilenameValue, {
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hash: `" + ${RuntimeGlobals.getFullHash}() + "`,
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hashWithLength: length =>
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`" + ${RuntimeGlobals.getFullHash}().slice(0, ${length}) + "`,
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chunk: {
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id: unquotedStringify(c.id),
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hash: unquotedStringify(c.renderedHash),
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hashWithLength: unquotedStringifyWithLength(c.renderedHash),
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name: unquotedStringify(c.name || c.id),
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contentHash: {
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[contentType]: unquotedStringify(c.contentHash[contentType])
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},
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contentHashWithLength: {
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[contentType]: unquotedStringifyWithLength(
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c.contentHash[contentType]
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)
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}
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},
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contentHashType: contentType
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});
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let set = staticUrls.get(staticChunkFilename);
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if (set === undefined) {
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staticUrls.set(staticChunkFilename, (set = new Set()));
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}
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set.add(c.id);
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};
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for (const [filename, chunks] of chunkFilenames) {
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if (filename !== dynamicFilename) {
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for (const c of chunks) addStaticUrl(c, filename);
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} else {
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for (const c of chunks) dynamicUrlChunks.add(c);
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}
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}
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/**
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* @param {function(Chunk): string | number} fn function from chunk to value
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* @returns {string} code with static mapping of results of fn
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*/
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const createMap = fn => {
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const obj = {};
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let useId = false;
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let lastKey;
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let entries = 0;
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for (const c of dynamicUrlChunks) {
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const value = fn(c);
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if (value === c.id) {
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useId = true;
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} else {
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obj[c.id] = value;
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lastKey = c.id;
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entries++;
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}
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}
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if (entries === 0) return "chunkId";
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if (entries === 1) {
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return useId
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? `(chunkId === ${JSON.stringify(lastKey)} ? ${JSON.stringify(
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obj[lastKey]
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)} : chunkId)`
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: JSON.stringify(obj[lastKey]);
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}
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return useId
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? `(${JSON.stringify(obj)}[chunkId] || chunkId)`
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: `${JSON.stringify(obj)}[chunkId]`;
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};
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/**
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* @param {function(Chunk): string | number} fn function from chunk to value
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* @returns {string} code with static mapping of results of fn for including in quoted string
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*/
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const mapExpr = fn => {
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return `" + ${createMap(fn)} + "`;
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};
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/**
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* @param {function(Chunk): string | number} fn function from chunk to value
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* @returns {function(number): string} function which generates code with static mapping of results of fn for including in quoted string for specific length
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*/
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const mapExprWithLength = fn => length => {
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return `" + ${createMap(c => `${fn(c)}`.slice(0, length))} + "`;
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};
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const url =
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dynamicFilename &&
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compilation.getPath(JSON.stringify(dynamicFilename), {
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hash: `" + ${RuntimeGlobals.getFullHash}() + "`,
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hashWithLength: length =>
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`" + ${RuntimeGlobals.getFullHash}().slice(0, ${length}) + "`,
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chunk: {
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id: `" + chunkId + "`,
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hash: mapExpr(c => c.renderedHash),
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hashWithLength: mapExprWithLength(c => c.renderedHash),
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name: mapExpr(c => c.name || c.id),
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contentHash: {
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[contentType]: mapExpr(c => c.contentHash[contentType])
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},
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contentHashWithLength: {
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[contentType]: mapExprWithLength(c => c.contentHash[contentType])
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}
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},
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contentHashType: contentType
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});
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return Template.asString([
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`// This function allow to reference ${includedChunksMessages.join(
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" and "
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)}`,
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`${global} = ${runtimeTemplate.basicFunction(
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"chunkId",
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staticUrls.size > 0
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? [
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"// return url for filenames not based on template",
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// it minimizes to `x===1?"...":x===2?"...":"..."`
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Template.asString(
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Array.from(staticUrls, ([url, ids]) => {
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const condition =
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ids.size === 1
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? `chunkId === ${JSON.stringify(first(ids))}`
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: `{${Array.from(
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ids,
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id => `${JSON.stringify(id)}:1`
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).join(",")}}[chunkId]`;
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return `if (${condition}) return ${url};`;
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})
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),
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"// return url for filenames based on template",
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`return ${url};`
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]
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: ["// return url for filenames based on template", `return ${url};`]
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)};`
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]);
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}
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}
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module.exports = GetChunkFilenameRuntimeModule;
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