mirror of https://github.com/webpack/webpack.git
242 lines
8.6 KiB
JavaScript
242 lines
8.6 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 chunkHasJs = require("../JavascriptModulesPlugin").chunkHasJs;
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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 compileBooleanMatcher = require("../util/compileBooleanMatcher");
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class ReadFileChunkLoadingRuntimeModule extends RuntimeModule {
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constructor(chunk, chunkGraph, runtimeRequirements) {
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super("readFile chunk loading", 10);
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this.chunk = chunk;
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this.chunkGraph = chunkGraph;
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this.runtimeRequirements = runtimeRequirements;
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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 { chunk, chunkGraph } = this;
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const fn = RuntimeGlobals.ensureChunkHandlers;
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const withLoading = this.runtimeRequirements.has(
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RuntimeGlobals.ensureChunkHandlers
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);
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const withHmr = this.runtimeRequirements.has(
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RuntimeGlobals.hmrDownloadUpdateHandlers
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);
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const withHmrManifest = this.runtimeRequirements.has(
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RuntimeGlobals.hmrDownloadManifest
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);
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const hasJsMatcher = compileBooleanMatcher(
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chunkGraph.getChunkConditionMap(chunk, chunkHasJs)
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);
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return Template.asString([
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"// object to store loaded chunks",
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'// "0" means "already loaded", Promise means loading',
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"var installedChunks = {",
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Template.indent(
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chunk.ids.map(id => `${JSON.stringify(id)}: 0`).join(",\n")
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),
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"};",
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"",
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withLoading
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? Template.asString([
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"// ReadFile + VM.run chunk loading for javascript",
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`${fn}.readFileVm = function(chunkId, promises) {`,
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hasJsMatcher !== false
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? Template.indent([
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"",
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"var installedChunkData = installedChunks[chunkId];",
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'if(installedChunkData !== 0) { // 0 means "already installed".',
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Template.indent([
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'// array of [resolve, reject, promise] means "currently loading"',
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"if(installedChunkData) {",
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Template.indent(["promises.push(installedChunkData[2]);"]),
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"} else {",
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Template.indent([
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hasJsMatcher === true
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? "if(true) { // all chunks have JS"
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: `if(${hasJsMatcher("chunkId")}) {`,
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Template.indent([
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"// load the chunk and return promise to it",
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"var promise = new Promise(function(resolve, reject) {",
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Template.indent([
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"installedChunkData = installedChunks[chunkId] = [resolve, reject];",
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`var filename = require('path').join(__dirname, ${RuntimeGlobals.getChunkScriptFilename}(chunkId));`,
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"require('fs').readFile(filename, 'utf-8', function(err, content) {",
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Template.indent([
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"if(err) return reject(err);",
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"var chunk = {};",
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"require('vm').runInThisContext('(function(exports, require, __dirname, __filename) {' + content + '\\n})', filename)" +
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"(chunk, require, require('path').dirname(filename), filename);",
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"var moreModules = chunk.modules, chunkIds = chunk.ids, runtime = chunk.runtime;",
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"for(var moduleId in moreModules) {",
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Template.indent([
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"if(Object.prototype.hasOwnProperty.call(moreModules, moduleId)) {",
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Template.indent([
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`${RuntimeGlobals.moduleFactories}[moduleId] = moreModules[moduleId];`
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]),
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"}"
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]),
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"}",
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`if(runtime) runtime(__webpack_require__);`,
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"var callbacks = [];",
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"for(var i = 0; i < chunkIds.length; i++) {",
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Template.indent([
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"if(installedChunks[chunkIds[i]])",
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Template.indent([
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"callbacks = callbacks.concat(installedChunks[chunkIds[i]][0]);"
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]),
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"installedChunks[chunkIds[i]] = 0;"
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]),
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"}",
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"for(i = 0; i < callbacks.length; i++)",
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Template.indent("callbacks[i]();")
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]),
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"});"
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]),
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"});",
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"promises.push(installedChunkData[2] = promise);"
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]),
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"} else installedChunks[chunkId] = 0;",
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"",
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withHmr
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? Template.asString([
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"if(currentUpdateChunks && currentUpdateChunks[chunkId]) promises.push(loadUpdateChunk(chunkId));"
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])
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: "// no HMR"
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]),
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"}"
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]),
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"}"
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])
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: Template.indent([
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"installedChunks[chunkId] = 0;",
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"",
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withHmr
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? Template.asString([
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"if(currentUpdateChunks && currentUpdateChunks[chunkId]) promises.push(loadUpdateChunk(chunkId));"
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])
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: "// no HMR"
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]),
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"};"
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])
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: "// no chunk loading",
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"",
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withHmr
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? Template.asString([
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"var currentUpdateChunks;",
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"var currentUpdate;",
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"var currentUpdateRuntime;",
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"function loadUpdateChunk(chunkId, updatedModulesList) {",
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Template.indent([
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"return new Promise(function(resolve, reject) {",
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Template.indent([
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`var filename = require('path').join(__dirname, ${RuntimeGlobals.getChunkUpdateScriptFilename}(chunkId));`,
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"require('fs').readFile(filename, 'utf-8', function(err, content) {",
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Template.indent([
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"if(err) return reject(err);",
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"var update = {};",
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"require('vm').runInThisContext('(function(exports, require, __dirname, __filename) {' + content + '\\n})', filename)" +
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"(update, require, require('path').dirname(filename), filename);",
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"var updatedModules = update.modules;",
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"var runtime = update.runtime;",
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"for(var moduleId in updatedModules) {",
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Template.indent([
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"if(Object.prototype.hasOwnProperty.call(updatedModules, moduleId)) {",
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Template.indent([
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`currentUpdate[moduleId] = updatedModules[moduleId];`,
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"if(updatedModulesList) updatedModulesList.push(moduleId);"
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]),
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"}"
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]),
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"}",
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"if(runtime) currentUpdateRuntime.push(runtime);",
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"resolve();"
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]),
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"});"
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]),
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"});"
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]),
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"}",
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"",
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`${RuntimeGlobals.hmrDownloadUpdateHandlers}.readFileVm = function(chunkIds, removedChunks, removedModules, promises, applyHandlers, updatedModulesList) {`,
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Template.indent([
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"applyHandlers.push(function(options) {",
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Template.indent([
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"currentUpdateChunks = undefined;",
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Template.getFunctionContent(
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require("../hmr/JavascriptHotModuleReplacement.runtime.js")
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)
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.replace(/\$options\$/g, "options")
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.replace(/\$updateModuleFactories\$/g, "currentUpdate")
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.replace(/\$updateRuntimeModules\$/g, "currentUpdateRuntime")
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.replace(/\$moduleCache\$/g, RuntimeGlobals.moduleCache)
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.replace(/\$hmrModuleData\$/g, RuntimeGlobals.hmrModuleData)
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.replace(
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/\$moduleFactories\$/g,
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RuntimeGlobals.moduleFactories
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)
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.replace(
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/\/\/ \$dispose\$/g,
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Template.asString([
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"removedChunks.forEach(function(chunkId) { delete installedChunks[chunkId]; });"
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])
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)
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]),
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"});",
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"currentUpdateChunks = {};",
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"currentUpdate = removedModules.reduce(function(obj, key) { obj[key] = false; return obj; }, {});",
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"currentUpdateRuntime = [];",
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"chunkIds.forEach(function(chunkId) {",
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Template.indent([
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"if(installedChunks[chunkId] !== undefined) {",
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Template.indent([
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"promises.push(loadUpdateChunk(chunkId, updatedModulesList));"
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]),
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"}",
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"currentUpdateChunks[chunkId] = true;"
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]),
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"});"
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]),
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"};"
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])
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: "// no HMR",
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"",
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withHmrManifest
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? Template.asString([
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`${RuntimeGlobals.hmrDownloadManifest} = function() {`,
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Template.indent([
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"return new Promise(function(resolve, reject) {",
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Template.indent([
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`var filename = require('path').join(__dirname, ${RuntimeGlobals.getUpdateManifestFilename}());`,
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"require('fs').readFile(filename, 'utf-8', function(err, content) {",
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Template.indent([
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"if(err) {",
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Template.indent([
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'if(err.code === "ENOENT") return resolve();',
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"return reject(err);"
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]),
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"}",
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"try { resolve(JSON.parse(content)); }",
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"catch(e) { reject(e); }"
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]),
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"});"
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]),
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"});"
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]),
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"}"
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])
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: "// no HMR manifest"
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]);
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}
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}
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module.exports = ReadFileChunkLoadingRuntimeModule;
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