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 /* 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/. */

 var EXPORTED_SYMBOLS = ['addListener', 'addObject',

                         'removeListener',

                         'sendMessage', 'log', 'pass', 'fail'];

 var listeners = {};

 // add a listener for a specific message type

 function addListener(msgType, listener) {

   if (listeners[msgType] === undefined) {

     listeners[msgType] = [];

   }

   listeners[msgType].push(listener);

 }

 // add each method in an object as a message listener

 function addObject(object) {

   for (var msgType in object) {

     addListener(msgType, object[msgType]);

   }

 }

 // remove a listener for all message types

 function removeListener(listener) {

   for (var msgType in listeners) {

     for (let i = 0; i < listeners.length; ++i) {

       if (listeners[msgType][i] == listener) {

         listeners[msgType].splice(i, 1); // remove listener from array

       }

     }

   }

 }

 function sendMessage(msgType, obj) {

   if (listeners[msgType] === undefined) {

     return;

   }

   for (let i = 0; i < listeners[msgType].length; ++i) {

     listeners[msgType][i](obj);

   }

 }

 function log(obj) {

   sendMessage('log', obj);

 }

 function pass(obj) {

   sendMessage('pass', obj);

 }

 function fail(obj) {

   sendMessage('fail', obj);

 }