webpack/lib/RequestShortener.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 path = require("path");

function RequestShortener(directory) {
	var parentDirectory = path.dirname(directory);
	if(/[\/\\]$/.test(directory)) directory = directory.substr(0, directory.length - 1);
	if(directory) {
		var currentDirectoryRegExp = directory.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
		currentDirectoryRegExp = new RegExp("^" + currentDirectoryRegExp + "|(!)" + currentDirectoryRegExp, "g");

		this.currentDirectoryRegExp = currentDirectoryRegExp;
	}

	if(/[\/\\]$/.test(parentDirectory)) parentDirectory = parentDirectory.substr(0, parentDirectory.length - 1);
	if(parentDirectory && parentDirectory !== directory) {
		var parentDirectoryRegExp = parentDirectory.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
		parentDirectoryRegExp = new RegExp("^" + parentDirectoryRegExp + "|(!)" + parentDirectoryRegExp, "g");

		this.parentDirectoryRegExp = parentDirectoryRegExp;
	}

	if(__dirname.length >= 2) {
		var buildins = path.join(__dirname, "..");
		var buildinsAsModule = currentDirectoryRegExp && currentDirectoryRegExp.test(buildins);
		var buildinsRegExp = buildins.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
		buildinsRegExp = new RegExp("^" + buildinsRegExp + "|(!)" + buildinsRegExp, "g");

		this.buildinsAsModule = buildinsAsModule;
		this.buildinsRegExp = buildinsRegExp;
	}

	this.node_modulesRegExp = /\/node_modules\//g;
	this.index_jsRegExp = /\/index.js(!|\?|\(query\))/g;
}
module.exports = RequestShortener;

RequestShortener.prototype.shorten = function(request) {
	if(!request)
		return request;
	if(this.buildinsAsModule && this.buildinsRegExp)
		request = request.replace(this.buildinsRegExp, "!(webpack)");
	if(this.currentDirectoryRegExp)
		request = request.replace(this.currentDirectoryRegExp, "!.");
	if(this.parentDirectoryRegExp)
		request = request.replace(this.parentDirectoryRegExp, "!..");
	if(!this.buildinsAsModule && this.buildinsRegExp)
		request = request.replace(this.buildinsRegExp, "!(webpack)");
	request = request.replace(/\\/g, "/");
	request = request.replace(this.node_modulesRegExp, "/~/");
	request = request.replace(this.index_jsRegExp, "$1");
	return request.replace(/^!|!$/, "");
};