mirror of https://github.com/webpack/webpack.git
237 lines
9.0 KiB
JavaScript
237 lines
9.0 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 SourceMapConsumer = require("source-map").SourceMapConsumer;
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const SourceMapSource = require("webpack-sources").SourceMapSource;
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const RawSource = require("webpack-sources").RawSource;
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const ConcatSource = require("webpack-sources").ConcatSource;
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const RequestShortener = require("../RequestShortener");
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const ModuleFilenameHelpers = require("../ModuleFilenameHelpers");
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const uglify = require("uglify-js");
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class UglifyJsPlugin {
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constructor(options) {
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if(typeof options !== "object" || Array.isArray(options)) options = {};
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if(typeof options.compressor !== "undefined") options.compress = options.compressor;
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this.options = options;
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}
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apply(compiler) {
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const options = this.options;
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options.test = options.test || /\.js($|\?)/i;
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const warningsFilter = options.warningsFilter || (() => true);
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const requestShortener = new RequestShortener(compiler.context);
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compiler.plugin("compilation", (compilation) => {
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if(options.sourceMap) {
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compilation.plugin("build-module", (module) => {
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// to get detailed location info about errors
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module.useSourceMap = true;
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});
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}
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compilation.plugin("optimize-chunk-assets", (chunks, callback) => {
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const files = [];
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chunks.forEach((chunk) => files.push.apply(files, chunk.files));
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files.push.apply(files, compilation.additionalChunkAssets);
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const filterdFiles = files.filter(ModuleFilenameHelpers.matchObject.bind(undefined, options));
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filterdFiles.forEach((file) => {
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const oldWarnFunction = uglify.AST_Node.warn_function;
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const warnings = [];
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let sourceMap;
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try {
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const asset = compilation.assets[file];
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if(asset.__UglifyJsPlugin) {
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compilation.assets[file] = asset.__UglifyJsPlugin;
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return;
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}
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let input;
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let inputSourceMap;
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if(options.sourceMap) {
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if(asset.sourceAndMap) {
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const sourceAndMap = asset.sourceAndMap();
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inputSourceMap = sourceAndMap.map;
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input = sourceAndMap.source;
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} else {
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inputSourceMap = asset.map();
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input = asset.source();
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}
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sourceMap = new SourceMapConsumer(inputSourceMap);
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uglify.AST_Node.warn_function = (warning) => { // eslint-disable-line camelcase
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const match = /\[.+:([0-9]+),([0-9]+)\]/.exec(warning);
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const line = +match[1];
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const column = +match[2];
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const original = sourceMap.originalPositionFor({
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line: line,
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column: column
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});
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if(!original || !original.source || original.source === file) return;
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if(!warningsFilter(original.source)) return;
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warnings.push(warning.replace(/\[.+:([0-9]+),([0-9]+)\]/, "") +
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"[" + requestShortener.shorten(original.source) + ":" + original.line + "," + original.column + "]");
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};
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} else {
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input = asset.source();
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uglify.AST_Node.warn_function = (warning) => { // eslint-disable-line camelcase
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warnings.push(warning);
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};
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}
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uglify.base54.reset();
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let ast = uglify.parse(input, {
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filename: file
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});
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if(options.compress !== false) {
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ast.figure_out_scope();
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const compress = uglify.Compressor(options.compress || {
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warnings: false
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}); // eslint-disable-line new-cap
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ast = ast.transform(compress);
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}
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if(options.mangle !== false) {
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ast.figure_out_scope(options.mangle || {});
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ast.compute_char_frequency(options.mangle || {});
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ast.mangle_names(options.mangle || {});
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if(options.mangle && options.mangle.props) {
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uglify.mangle_properties(ast, options.mangle.props);
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}
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}
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const output = {};
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output.comments = Object.prototype.hasOwnProperty.call(options, "comments") ? options.comments : /^\**!|@preserve|@license/;
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output.beautify = options.beautify;
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for(let k in options.output) {
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output[k] = options.output[k];
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}
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const extractedComments = [];
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if(options.extractComments) {
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const condition = {};
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if(typeof options.extractComments === "string" || options.extractComments instanceof RegExp) {
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// extractComments specifies the extract condition and output.comments specifies the preserve condition
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condition.preserve = output.comments;
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condition.extract = options.extractComments;
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} else if(Object.prototype.hasOwnProperty.call(options.extractComments, "condition")) {
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// Extract condition is given in extractComments.condition
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condition.preserve = output.comments;
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condition.extract = options.extractComments.condition;
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} else {
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// No extract condition is given. Extract comments that match output.comments instead of preserving them
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condition.preserve = false;
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condition.extract = output.comments;
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}
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// Ensure that both conditions are functions
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["preserve", "extract"].forEach(key => {
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switch(typeof condition[key]) {
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case "boolean":
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var b = condition[key];
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condition[key] = () => b;
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break;
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case "function":
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break;
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case "string":
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if(condition[key] === "all") {
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condition[key] = () => true;
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break;
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}
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var regex = new RegExp(condition[key]);
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condition[key] = (astNode, comment) => regex.test(comment.value);
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break;
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default:
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regex = condition[key];
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condition[key] = (astNode, comment) => regex.test(comment.value);
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}
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});
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// Redefine the comments function to extract and preserve
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// comments according to the two conditions
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output.comments = (astNode, comment) => {
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if(condition.extract(astNode, comment)) {
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extractedComments.push(
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comment.type === "comment2" ? "/*" + comment.value + "*/" : "//" + comment.value
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);
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}
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return condition.preserve(astNode, comment);
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};
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}
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let map;
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if(options.sourceMap) {
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map = uglify.SourceMap({ // eslint-disable-line new-cap
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file: file,
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root: ""
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});
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output.source_map = map; // eslint-disable-line camelcase
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}
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const stream = uglify.OutputStream(output); // eslint-disable-line new-cap
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ast.print(stream);
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if(map) map = map + "";
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const stringifiedStream = stream + "";
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let outputSource = (map ?
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new SourceMapSource(stringifiedStream, file, JSON.parse(map), input, inputSourceMap) :
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new RawSource(stringifiedStream));
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if(extractedComments.length > 0) {
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let commentsFile = options.extractComments.filename || file + ".LICENSE";
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if(typeof commentsFile === "function") {
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commentsFile = commentsFile(file);
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}
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// Write extracted comments to commentsFile
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const commentsSource = new RawSource(extractedComments.join("\n\n") + "\n");
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if(commentsFile in compilation.assets) {
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// commentsFile already exists, append new comments...
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if(compilation.assets[commentsFile] instanceof ConcatSource) {
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compilation.assets[commentsFile].add("\n");
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compilation.assets[commentsFile].add(commentsSource);
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} else {
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compilation.assets[commentsFile] = new ConcatSource(
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compilation.assets[commentsFile], "\n", commentsSource
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);
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}
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} else {
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compilation.assets[commentsFile] = commentsSource;
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}
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// Add a banner to the original file
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if(options.extractComments.banner !== false) {
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let banner = options.extractComments.banner || "For license information please see " + commentsFile;
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if(typeof banner === "function") {
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banner = banner(commentsFile);
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}
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if(banner) {
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outputSource = new ConcatSource(
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"/*! " + banner + " */\n", outputSource
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);
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}
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}
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}
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asset.__UglifyJsPlugin = compilation.assets[file] = outputSource;
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if(warnings.length > 0) {
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compilation.warnings.push(new Error(file + " from UglifyJs\n" + warnings.join("\n")));
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}
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} catch(err) {
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if(err.line) {
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const original = sourceMap && sourceMap.originalPositionFor({
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line: err.line,
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column: err.col
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});
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if(original && original.source) {
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compilation.errors.push(new Error(file + " from UglifyJs\n" + err.message + " [" + requestShortener.shorten(original.source) + ":" + original.line + "," + original.column + "][" + file + ":" + err.line + "," + err.col + "]"));
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} else {
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compilation.errors.push(new Error(file + " from UglifyJs\n" + err.message + " [" + file + ":" + err.line + "," + err.col + "]"));
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}
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} else if(err.msg) {
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compilation.errors.push(new Error(file + " from UglifyJs\n" + err.msg));
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} else
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compilation.errors.push(new Error(file + " from UglifyJs\n" + err.stack));
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} finally {
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uglify.AST_Node.warn_function = oldWarnFunction; // eslint-disable-line camelcase
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}
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});
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callback();
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});
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});
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}
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}
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module.exports = UglifyJsPlugin;
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