/*

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.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(/^!|!$/, "");

};