michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, you can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: var EXPORTED_SYMBOLS = ['addListener', 'addObject',
michael@0:                         'removeListener',
michael@0:                         'sendMessage', 'log', 'pass', 'fail'];
michael@0: 
michael@0: var listeners = {};
michael@0: 
michael@0: // add a listener for a specific message type
michael@0: function addListener(msgType, listener) {
michael@0:   if (listeners[msgType] === undefined) {
michael@0:     listeners[msgType] = [];
michael@0:   }
michael@0: 
michael@0:   listeners[msgType].push(listener);
michael@0: }
michael@0: 
michael@0: // add each method in an object as a message listener
michael@0: function addObject(object) {
michael@0:   for (var msgType in object) {
michael@0:     addListener(msgType, object[msgType]);
michael@0:   }
michael@0: }
michael@0: 
michael@0: // remove a listener for all message types
michael@0: function removeListener(listener) {
michael@0:   for (var msgType in listeners) {
michael@0:     for (let i = 0; i < listeners.length; ++i) {
michael@0:       if (listeners[msgType][i] == listener) {
michael@0:         listeners[msgType].splice(i, 1); // remove listener from array
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: function sendMessage(msgType, obj) {
michael@0:   if (listeners[msgType] === undefined) {
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   for (let i = 0; i < listeners[msgType].length; ++i) {
michael@0:     listeners[msgType][i](obj);
michael@0:   }
michael@0: }
michael@0: 
michael@0: function log(obj) {
michael@0:   sendMessage('log', obj);
michael@0: }
michael@0: 
michael@0: function pass(obj) {
michael@0:   sendMessage('pass', obj);
michael@0: }
michael@0: 
michael@0: function fail(obj) {
michael@0:   sendMessage('fail', obj);
michael@0: }