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index.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
var fs = require('fs');
var ConcatSource = require("webpack-sources").ConcatSource;
var async = require("async");
var ExtractedModule = require("./ExtractedModule");
var Chunk = require("webpack/lib/Chunk");
var OrderUndefinedError = require("./OrderUndefinedError");
var loaderUtils = require("loader-utils");
var schemaTester = require('./schema/validator');
var loaderSchema = require('./schema/loader-schema.json');
var pluginSchema = require('./schema/plugin-schema.json');
var NS = fs.realpathSync(__dirname);
var nextId = 0;
function ExtractTextPluginCompilation() {
this.modulesByIdentifier = {};
}
ExtractTextPlugin.prototype.mergeNonInitialChunks = function(chunk, intoChunk, checkedChunks) {
if(!intoChunk) {
checkedChunks = [];
chunk.chunks.forEach(function(c) {
if(c.isInitial()) return;
this.mergeNonInitialChunks(c, chunk, checkedChunks);
}, this);
} else if(checkedChunks.indexOf(chunk) < 0) {
checkedChunks.push(chunk);
chunk.modules.slice().forEach(function(module) {
intoChunk.addModule(module);
module.addChunk(intoChunk);
});
chunk.chunks.forEach(function(c) {
if(c.isInitial()) return;
this.mergeNonInitialChunks(c, intoChunk, checkedChunks);
}, this);
}
};
ExtractTextPluginCompilation.prototype.addModule = function(identifier, originalModule, source, additionalInformation, sourceMap, prevModules) {
var m;
if(!this.modulesByIdentifier[identifier]) {
m = this.modulesByIdentifier[identifier] = new ExtractedModule(identifier, originalModule, source, sourceMap, additionalInformation, prevModules);
} else {
m = this.modulesByIdentifier[identifier];
m.addPrevModules(prevModules);
if(originalModule.index2 < m.getOriginalModule().index2) {
m.setOriginalModule(originalModule);
}
}
return m;
};
ExtractTextPluginCompilation.prototype.addResultToChunk = function(identifier, result, originalModule, extractedChunk) {
if(!Array.isArray(result)) {
result = [[identifier, result]];
}
var counterMap = {};
var prevModules = [];
result.forEach(function(item) {
var c = counterMap[item[0]];
var module = this.addModule.call(this, item[0] + (c || ""), originalModule, item[1], item[2], item[3], prevModules.slice());
extractedChunk.addModule(module);
module.addChunk(extractedChunk);
counterMap[item[0]] = (c || 0) + 1;
prevModules.push(module);
}, this);
};
ExtractTextPlugin.prototype.renderExtractedChunk = function(chunk) {
var source = new ConcatSource();
chunk.modules.forEach(function(module) {
var moduleSource = module.source();
source.add(this.applyAdditionalInformation(moduleSource, module.additionalInformation));
}, this);
return source;
};
function isInvalidOrder(a, b) {
var bBeforeA = a.getPrevModules().indexOf(b) >= 0;
var aBeforeB = b.getPrevModules().indexOf(a) >= 0;
return aBeforeB && bBeforeA;
}
function getOrder(a, b) {
var aOrder = a.getOrder();
var bOrder = b.getOrder();
if(aOrder < bOrder) return -1;
if(aOrder > bOrder) return 1;
var aIndex = a.getOriginalModule().index2;
var bIndex = b.getOriginalModule().index2;
if(aIndex < bIndex) return -1;
if(aIndex > bIndex) return 1;
var bBeforeA = a.getPrevModules().indexOf(b) >= 0;
var aBeforeB = b.getPrevModules().indexOf(a) >= 0;
if(aBeforeB && !bBeforeA) return -1;
if(!aBeforeB && bBeforeA) return 1;
var ai = a.identifier();
var bi = b.identifier();
if(ai < bi) return -1;
if(ai > bi) return 1;
return 0;
}
function ExtractTextPlugin(options) {
if(arguments.length > 1) {
throw new Error("Breaking change: ExtractTextPlugin now only takes a single argument. Either an options " +
"object *or* the name of the result file.\n" +
"Example: if your old code looked like this:\n" +
" new ExtractTextPlugin('css/[name].css', { disable: false, allChunks: true })\n\n" +
"You would change it to:\n" +
" new ExtractTextPlugin({ filename: 'css/[name].css', disable: false, allChunks: true })\n\n" +
"The available options are:\n" +
" filename: string\n" +
" allChunks: boolean\n" +
" disable: boolean\n");
}
if(isString(options)) {
options = { filename: options };
} else {
schemaTester(pluginSchema, options);
}
this.filename = options.filename;
this.id = options.id != null ? options.id : ++nextId;
this.options = {};
mergeOptions(this.options, options);
delete this.options.filename;
delete this.options.id;
}
module.exports = ExtractTextPlugin;
function getLoaderObject(loader) {
if (isString(loader)) {
return {loader: loader};
}
return loader;
}
function mergeOptions(a, b) {
if(!b) return a;
Object.keys(b).forEach(function(key) {
a[key] = b[key];
});
return a;
}
function isString(a) {
return typeof a === "string";
}
ExtractTextPlugin.loader = function(options) {
return { loader: require.resolve("./loader"), options: options };
};
ExtractTextPlugin.prototype.applyAdditionalInformation = function(source, info) {
if(info) {
return new ConcatSource(
"@media " + info[0] + " {",
source,
"}"
);
}
return source;
};
ExtractTextPlugin.prototype.loader = function(options) {
return ExtractTextPlugin.loader(mergeOptions({id: this.id}, options));
};
ExtractTextPlugin.prototype.extract = function(options) {
if(arguments.length > 1) {
throw new Error("Breaking change: extract now only takes a single argument. Either an options " +
"object *or* the loader(s).\n" +
"Example: if your old code looked like this:\n" +
" ExtractTextPlugin.extract('style-loader', 'css-loader')\n\n" +
"You would change it to:\n" +
" ExtractTextPlugin.extract({ fallbackLoader: 'style-loader', loader: 'css-loader' })\n\n" +
"The available options are:\n" +
" loader: string | object | loader[]\n" +
" fallbackLoader: string | object | loader[]\n" +
" publicPath: string\n");
}
if(Array.isArray(options) || isString(options) || typeof options.options === "object" || typeof options.query === 'object') {
options = { loader: options };
} else {
schemaTester(loaderSchema, options);
}
var loader = options.loader;
var before = options.fallbackLoader || [];
if(isString(loader)) {
loader = loader.split("!");
}
if(isString(before)) {
before = before.split("!");
} else if(!Array.isArray(before)) {
before = [before];
}
options = mergeOptions({omit: before.length, remove: true}, options);
delete options.loader;
delete options.fallbackLoader;
return [this.loader(options)]
.concat(before, loader)
.map(getLoaderObject);
}
ExtractTextPlugin.extract = ExtractTextPlugin.prototype.extract.bind(ExtractTextPlugin);
ExtractTextPlugin.prototype.apply = function(compiler) {
var options = this.options;
compiler.plugin("this-compilation", function(compilation) {
var extractCompilation = new ExtractTextPluginCompilation();
compilation.plugin("normal-module-loader", function(loaderContext, module) {
loaderContext[NS] = function(content, opt) {
if(options.disable)
return false;
if(!Array.isArray(content) && content != null)
throw new Error("Exported value was not extracted as an array: " + JSON.stringify(content));
module[NS] = {
content: content,
options: opt || {}
};
return options.allChunks || module[NS + "/extract"]; // eslint-disable-line no-path-concat
};
});
var filename = this.filename;
var id = this.id;
var extractedChunks, entryChunks, initialChunks;
compilation.plugin("optimize-tree", function(chunks, modules, callback) {
extractedChunks = chunks.map(function() {
return new Chunk();
});
chunks.forEach(function(chunk, i) {
var extractedChunk = extractedChunks[i];
extractedChunk.index = i;
extractedChunk.originalChunk = chunk;
extractedChunk.name = chunk.name;
extractedChunk.entrypoints = chunk.entrypoints;
chunk.chunks.forEach(function(c) {
extractedChunk.addChunk(extractedChunks[chunks.indexOf(c)]);
});
chunk.parents.forEach(function(c) {
extractedChunk.addParent(extractedChunks[chunks.indexOf(c)]);
});
});
async.forEach(chunks, function(chunk, callback) {
var extractedChunk = extractedChunks[chunks.indexOf(chunk)];
var shouldExtract = !!(options.allChunks || chunk.isInitial());
async.forEach(chunk.modules.slice(), function(module, callback) {
var meta = module[NS];
if(meta && (!meta.options.id || meta.options.id === id)) {
var wasExtracted = Array.isArray(meta.content);
if(shouldExtract !== wasExtracted) {
module[NS + "/extract"] = shouldExtract; // eslint-disable-line no-path-concat
compilation.rebuildModule(module, function(err) {
if(err) {
compilation.errors.push(err);
return callback();
}
meta = module[NS];
if(!Array.isArray(meta.content)) {
err = new Error(module.identifier() + " doesn't export content");
compilation.errors.push(err);
return callback();
}
if(meta.content)
extractCompilation.addResultToChunk(module.identifier(), meta.content, module, extractedChunk);
callback();
});
} else {
if(meta.content)
extractCompilation.addResultToChunk(module.identifier(), meta.content, module, extractedChunk);
callback();
}
} else callback();
}, function(err) {
if(err) return callback(err);
callback();
});
}, function(err) {
if(err) return callback(err);
extractedChunks.forEach(function(extractedChunk) {
if(extractedChunk.isInitial())
this.mergeNonInitialChunks(extractedChunk);
}, this);
extractedChunks.forEach(function(extractedChunk) {
if(!extractedChunk.isInitial()) {
extractedChunk.modules.slice().forEach(function(module) {
extractedChunk.removeModule(module);
});
}
});
compilation.applyPlugins("optimize-extracted-chunks", extractedChunks);
callback();
}.bind(this));
}.bind(this));
compilation.plugin("additional-assets", function(callback) {
extractedChunks.forEach(function(extractedChunk) {
if(extractedChunk.modules.length) {
extractedChunk.modules.sort(function(a, b) {
if(!options.ignoreOrder && isInvalidOrder(a, b)) {
compilation.errors.push(new OrderUndefinedError(a.getOriginalModule()));
compilation.errors.push(new OrderUndefinedError(b.getOriginalModule()));
}
return getOrder(a, b);
});
var chunk = extractedChunk.originalChunk;
var source = this.renderExtractedChunk(extractedChunk);
var file = compilation.getPath(filename, {
chunk: chunk
}).replace(/\[(?:(\w+):)?contenthash(?::([a-z]+\d*))?(?::(\d+))?\]/ig, function() {
return loaderUtils.getHashDigest(source.source(), arguments[1], arguments[2], parseInt(arguments[3], 10));
});
compilation.assets[file] = source;
chunk.files.push(file);
}
}, this);
callback();
}.bind(this));
}.bind(this));
};