webpack/lib/MultiCompiler.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jade, coffee, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
var Tapable = require("tapable");
var async = require("async");
var Stats = require("./Stats");

function MultiWatching(watchings) {
	this.watchings = watchings;
}

MultiWatching.prototype.invalidate = function() {
	this.watchings.forEach(function(watching) {
		watching.invalidate();
	});
};

MultiWatching.prototype.close = function(callback) {
	async.forEach(this.watchings, function(watching, callback) {
		watching.close(callback);
	}, callback);
};

function MultiCompiler(compilers) {
	Tapable.call(this);
	if(!Array.isArray(compilers)) {
		compilers = Object.keys(compilers).map(function(name) {
			compilers[name].name = name;
			return compilers[name];
		});
	}
	this.compilers = compilers;

	function delegateProperty(name) {
		Object.defineProperty(this, name, {
			configurable: false,
			get: function() {
				throw new Error("Cannot read " + name + " of a MultiCompiler");
			},
			set: function(value) {
				this.compilers.forEach(function(compiler) {
					compiler[name] = value;
				});
			}.bind(this)
		});
	}
	delegateProperty.call(this, "outputFileSystem");
	delegateProperty.call(this, "inputFileSystem");
	
	Object.defineProperty(this, "outputPath", {
		configurable: false,
		get: function() {
			var commonPath = compilers[0].outputPath;
			for(var i = 1; i < compilers.length; i++) {
				while(compilers[i].outputPath.indexOf(commonPath) !== 0 || commonPath.length <= 1) {
					commonPath = commonPath.replace(/[\/\\][^\/\\]*$/, "");
				}
			}
			return commonPath;
		}
	});

	var doneCompilers = 0;
	var compilerStats = [];
	this.compilers.forEach(function(compiler, idx) {
		var compilerDone = false;
		compiler.plugin("done", function(stats) {
			if(!compilerDone) {
				compilerDone = true;
				doneCompilers++;
			}
			compilerStats[idx] = stats;
			if(doneCompilers === this.compilers.length) {
				this.applyPlugins("done", new MultiStats(compilerStats));
			}
		}.bind(this));
		compiler.plugin("invalid", function() {
			if(compilerDone) {
				compilerDone = false;
				doneCompilers--;
			}
			this.applyPlugins("invalid");
		}.bind(this));
	}, this);
}
module.exports = MultiCompiler;

MultiCompiler.prototype = Object.create(Tapable.prototype);

MultiCompiler.prototype.watch = function(watchDelay, handler) {
	var watchings = this.compilers.map(function(compiler) {
		return compiler.watch(watchDelay, handler);
	});
	return new MultiWatching(watchings);
};

MultiCompiler.prototype.run = function(callback) {
	async.map(this.compilers, function(compiler, callback) {
		compiler.run(callback);
	}, function(err, stats) {
		if(err) return callback(err);
		callback(null, new MultiStats(stats));
	});
};

MultiCompiler.prototype.purgeInputFileSystem = function() {
	this.compilers.forEach(function(compiler) {
		if(compiler.inputFileSystem && compiler.inputFileSystem.purge)
			compiler.inputFileSystem.purge();
	});
};

function MultiStats(stats) {
	this.stats = stats;
	this.hash = stats.map(function(stat) {
		return stat.hash;
	}).join("");
}

MultiStats.prototype.hasErrors = function() {
	return this.stats.map(function(stat) {
		return stat.hasErrors();
	}).reduce(function(a, b) { return a || b; }, false);
};

MultiStats.prototype.hasWarnings = function() {
	return this.stats.map(function(stat) {
		return stat.hasWarnings();
	}).reduce(function(a, b) { return a || b; }, false);
};

MultiStats.prototype.toJson = function(options, forToString) {
	var jsons = this.stats.map(function(stat) {
		var obj = stat.toJson(options, forToString);
		obj.name = stat.compilation && stat.compilation.name;
		return obj;
	});
	return {
		version: require("../package.json").version,
		hash: this.hash,
		errors: jsons.reduce(function(arr, j) {
			return arr.concat(j.errors.map(function(msg) {
				return "(" + j.name + ") " + msg
			}));
		}, []),
		warnings: jsons.reduce(function(arr, j) {
			return arr.concat(j.warnings.map(function(msg) {
				return "(" + j.name + ") " + msg
			}));
		}, []),
		children: jsons
	};
};

MultiStats.prototype.toString = Stats.prototype.toString;