webpack-uglify-js-plugin/utils/RequestShortener.js

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

function RequestShortener(directory) {
  directory = directory.replace(/\\/g, "/");
  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, "..").replace(/\\/g, "/");
    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.nodeModulesRegExp = /\/node_modules\//g;
  this.indexJsRegExp = /\/index.js(!|\?|\(query\))/g;
}
module.exports = RequestShortener;

RequestShortener.prototype.shorten = function(request) {
  if(!request)
    return request;
  request = request.replace(/\\/g, "/");
  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(this.nodeModulesRegExp, "/~/");
  request = request.replace(this.indexJsRegExp, "$1");
  return request.replace(/^!|!$/, "");
};