The Tor Browser / file revision

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 'use strict';

 module.metadata = {

   'stability': 'unstable'

 };

 const privateNS = require('../../core/namespace').ns();

 function getOwnerWindow(thing) {

   try {

     // check for and return associated window

     let fn = (privateNS(thing.prototype) || privateNS(thing) || {}).getOwnerWindow;

     if (fn)

       return fn.apply(fn, [thing].concat(arguments));

   }

   // stuff like numbers and strings throw errors with namespaces

   catch(e) {}

   // default

   return undefined;

 }

 getOwnerWindow.define = function(Type, fn) {

   privateNS(Type.prototype).getOwnerWindow = fn;

 }

 getOwnerWindow.implement = function(instance, fn) {

   privateNS(instance).getOwnerWindow = fn;

 }

 exports.getOwnerWindow = getOwnerWindow;