webpack/lib/dependencies/RequireContextPlugin.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 RequireContextDependency = require("./RequireContextDependency");
var ContextElementDependency = require("./ContextElementDependency");

var RequireContextDependencyParserPlugin = require("./RequireContextDependencyParserPlugin");

function RequireContextPlugin(modulesDirectories, extensions) {
	this.modulesDirectories = modulesDirectories;
	this.extensions = extensions;
}
module.exports = RequireContextPlugin;

RequireContextPlugin.prototype.apply = function(compiler) {
	var modulesDirectories = this.modulesDirectories;
	var extensions = this.extensions;
	compiler.plugin("compilation", function(compilation, params) {
		var contextModuleFactory = params.contextModuleFactory;
		var normalModuleFactory = params.normalModuleFactory;

		compilation.dependencyFactories.set(RequireContextDependency, contextModuleFactory);
		compilation.dependencyTemplates.set(RequireContextDependency, new RequireContextDependency.Template());

		compilation.dependencyFactories.set(ContextElementDependency, normalModuleFactory);
	});
	compiler.plugin("context-module-factory", function(cmf) {
		cmf.plugin("alternatives", function(items, callback) {
			if(items.length === 0) return callback(null, items);

			callback(null, items.map(function(obj) {
				return extensions.filter(function(ext) {
					var l = obj.request.length;
					return (l > ext.length && obj.request.substr(l - ext.length, l) === ext);
				}).map(function(ext) {
					var l = obj.request.length;
					return {
						context: obj.context,
						request: obj.request.substr(0, l - ext.length)
					}
				});
			}).reduce(function(a, b) {
				return a.concat(b);
			}, []));
		});
		cmf.plugin("alternatives", function(items, callback) {
			if(items.length === 0) return callback(null, items);

			callback(null, items.map(function(obj) {
				for(var i = 0; i < modulesDirectories.length; i++) {
					var dir = modulesDirectories[i];
					var idx = obj.request.indexOf("./" + dir + "/");
					if(idx === 0) {
						obj.request = obj.request.slice(dir.length+3);
						break;
					}
				}
				return obj;
			}));
		});
	});
	new RequireContextDependencyParserPlugin().apply(compiler.parser);
};