mirror of https://github.com/webpack/webpack.git
322 lines
9.4 KiB
JavaScript
322 lines
9.4 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Sergey Melyukov @smelukov
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*/
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"use strict";
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const mimeTypes = require("mime-types");
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const path = require("path");
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const { RawSource } = require("webpack-sources");
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const Generator = require("../Generator");
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const RuntimeGlobals = require("../RuntimeGlobals");
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const createHash = require("../util/createHash");
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const { makePathsRelative } = require("../util/identifier");
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/** @typedef {import("webpack-sources").Source} Source */
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/** @typedef {import("../../declarations/WebpackOptions").AssetGeneratorOptions} AssetGeneratorOptions */
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/** @typedef {import("../../declarations/WebpackOptions").RawPublicPath} RawPublicPath */
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/** @typedef {import("../Compilation")} Compilation */
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/** @typedef {import("../Compiler")} Compiler */
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/** @typedef {import("../Generator").GenerateContext} GenerateContext */
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/** @typedef {import("../Generator").UpdateHashContext} UpdateHashContext */
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/** @typedef {import("../Module")} Module */
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/** @typedef {import("../NormalModule")} NormalModule */
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/** @typedef {import("../RuntimeTemplate")} RuntimeTemplate */
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/** @typedef {import("../util/Hash")} Hash */
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const mergeMaybeArrays = (a, b) => {
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const set = new Set();
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if (Array.isArray(a)) for (const item of a) set.add(item);
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else set.add(a);
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if (Array.isArray(b)) for (const item of b) set.add(item);
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else set.add(b);
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return Array.from(set);
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};
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const mergeAssetInfo = (a, b) => {
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const result = { ...a, ...b };
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for (const key of Object.keys(a)) {
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if (key in b) {
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if (a[key] === b[key]) continue;
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switch (key) {
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case "fullhash":
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case "chunkhash":
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case "modulehash":
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case "contenthash":
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result[key] = mergeMaybeArrays(a[key], b[key]);
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break;
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case "immutable":
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case "development":
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case "hotModuleReplacement":
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case "javascriptModule ":
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result[key] = a[key] || b[key];
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break;
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case "related":
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result[key] = mergeRelatedInfo(a[key], b[key]);
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break;
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default:
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throw new Error(`Can't handle conflicting asset info for ${key}`);
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}
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}
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}
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return result;
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};
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const mergeRelatedInfo = (a, b) => {
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const result = { ...a, ...b };
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for (const key of Object.keys(a)) {
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if (key in b) {
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if (a[key] === b[key]) continue;
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result[key] = mergeMaybeArrays(a[key], b[key]);
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}
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}
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return result;
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};
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const JS_TYPES = new Set(["javascript"]);
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const JS_AND_ASSET_TYPES = new Set(["javascript", "asset"]);
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class AssetGenerator extends Generator {
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/**
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* @param {AssetGeneratorOptions["dataUrl"]=} dataUrlOptions the options for the data url
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* @param {string=} filename override for output.assetModuleFilename
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* @param {RawPublicPath=} publicPath override for output.assetModulePublicPath
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* @param {boolean=} emit generate output asset
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*/
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constructor(dataUrlOptions, filename, publicPath, emit) {
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super();
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this.dataUrlOptions = dataUrlOptions;
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this.filename = filename;
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this.publicPath = publicPath;
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this.emit = emit;
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}
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/**
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* @param {NormalModule} module module for which the code should be generated
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* @param {GenerateContext} generateContext context for generate
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* @returns {Source} generated code
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*/
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generate(
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module,
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{ runtime, chunkGraph, runtimeTemplate, runtimeRequirements, type, getData }
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) {
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switch (type) {
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case "asset":
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return module.originalSource();
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default: {
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runtimeRequirements.add(RuntimeGlobals.module);
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const originalSource = module.originalSource();
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if (module.buildInfo.dataUrl) {
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let encodedSource;
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if (typeof this.dataUrlOptions === "function") {
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encodedSource = this.dataUrlOptions.call(
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null,
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originalSource.source(),
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{
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filename: module.matchResource || module.resource,
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module
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}
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);
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} else {
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/** @type {string | false | undefined} */
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let encoding = this.dataUrlOptions.encoding;
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if (encoding === undefined) {
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if (
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module.resourceResolveData &&
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module.resourceResolveData.encoding !== undefined
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) {
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encoding = module.resourceResolveData.encoding;
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}
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}
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if (encoding === undefined) {
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encoding = "base64";
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}
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let ext;
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let mimeType = this.dataUrlOptions.mimetype;
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if (mimeType === undefined) {
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ext = path.extname(module.nameForCondition());
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if (
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module.resourceResolveData &&
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module.resourceResolveData.mimetype !== undefined
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) {
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mimeType = module.resourceResolveData.mimetype;
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} else if (ext) {
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mimeType = mimeTypes.lookup(ext);
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}
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}
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if (typeof mimeType !== "string") {
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throw new Error(
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"DataUrl can't be generated automatically, " +
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`because there is no mimetype for "${ext}" in mimetype database. ` +
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'Either pass a mimetype via "generator.mimetype" or ' +
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'use type: "asset/resource" to create a resource file instead of a DataUrl'
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);
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}
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let encodedContent;
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switch (encoding) {
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case "base64": {
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encodedContent = originalSource.buffer().toString("base64");
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break;
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}
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case false: {
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const content = originalSource.source();
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if (typeof content === "string") {
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encodedContent = encodeURI(content);
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} else {
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encodedContent = encodeURI(content.toString("utf-8"));
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}
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break;
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}
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default:
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throw new Error(`Unsupported encoding '${encoding}'`);
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}
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encodedSource = `data:${mimeType}${
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encoding ? `;${encoding}` : ""
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},${encodedContent}`;
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}
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return new RawSource(
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`${RuntimeGlobals.module}.exports = ${JSON.stringify(
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encodedSource
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)};`
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);
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} else {
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const assetModuleFilename =
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this.filename || runtimeTemplate.outputOptions.assetModuleFilename;
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const hash = createHash(runtimeTemplate.outputOptions.hashFunction);
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if (runtimeTemplate.outputOptions.hashSalt) {
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hash.update(runtimeTemplate.outputOptions.hashSalt);
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}
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hash.update(originalSource.buffer());
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const fullHash = /** @type {string} */ (
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hash.digest(runtimeTemplate.outputOptions.hashDigest)
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);
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const contentHash = fullHash.slice(
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0,
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runtimeTemplate.outputOptions.hashDigestLength
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);
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module.buildInfo.fullContentHash = fullHash;
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const sourceFilename = makePathsRelative(
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runtimeTemplate.compilation.compiler.context,
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module.matchResource || module.resource,
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runtimeTemplate.compilation.compiler.root
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).replace(/^\.\//, "");
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let { path: filename, info: assetInfo } =
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runtimeTemplate.compilation.getAssetPathWithInfo(
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assetModuleFilename,
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{
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module,
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runtime,
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filename: sourceFilename,
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chunkGraph,
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contentHash
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}
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);
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let publicPath;
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if (this.publicPath) {
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const { path, info } =
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runtimeTemplate.compilation.getAssetPathWithInfo(
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this.publicPath,
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{
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module,
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runtime,
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filename: sourceFilename,
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chunkGraph,
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contentHash
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}
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);
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publicPath = JSON.stringify(path);
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assetInfo = mergeAssetInfo(assetInfo, info);
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} else {
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publicPath = RuntimeGlobals.publicPath;
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runtimeRequirements.add(RuntimeGlobals.publicPath); // add __webpack_require__.p
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}
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assetInfo = {
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sourceFilename,
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...assetInfo
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};
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module.buildInfo.filename = filename;
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module.buildInfo.assetInfo = assetInfo;
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if (getData) {
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// Due to code generation caching module.buildInfo.XXX can't used to store such information
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// It need to be stored in the code generation results instead, where it's cached too
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// TODO webpack 6 For back-compat reasons we also store in on module.buildInfo
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const data = getData();
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data.set("fullContentHash", fullHash);
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data.set("filename", filename);
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data.set("assetInfo", assetInfo);
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}
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return new RawSource(
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`${
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RuntimeGlobals.module
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}.exports = ${publicPath} + ${JSON.stringify(filename)};`
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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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* @param {NormalModule} module fresh module
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* @returns {Set<string>} available types (do not mutate)
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*/
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getTypes(module) {
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if ((module.buildInfo && module.buildInfo.dataUrl) || this.emit === false) {
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return JS_TYPES;
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} else {
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return JS_AND_ASSET_TYPES;
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}
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}
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/**
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* @param {NormalModule} module the module
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* @param {string=} type source type
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* @returns {number} estimate size of the module
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*/
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getSize(module, type) {
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switch (type) {
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case "asset": {
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const originalSource = module.originalSource();
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if (!originalSource) {
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return 0;
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}
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return originalSource.size();
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}
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default:
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if (module.buildInfo && module.buildInfo.dataUrl) {
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const originalSource = module.originalSource();
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if (!originalSource) {
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return 0;
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}
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// roughly for data url
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// Example: m.exports="data:image/png;base64,ag82/f+2=="
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// 4/3 = base64 encoding
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// 34 = ~ data url header + footer + rounding
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return originalSource.size() * 1.34 + 36;
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} else {
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// it's only estimated so this number is probably fine
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// Example: m.exports=r.p+"0123456789012345678901.ext"
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return 42;
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}
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}
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}
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/**
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* @param {Hash} hash hash that will be modified
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* @param {UpdateHashContext} updateHashContext context for updating hash
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*/
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updateHash(hash, { module }) {
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hash.update(module.buildInfo.dataUrl ? "data-url" : "resource");
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}
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}
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module.exports = AssetGenerator;
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