ARSpeechRecognition.js

/*
 * Copyright 2017 Google Inc. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the 'License');
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an 'AS IS' BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

 /* eslint-disable */
(function() {
  if (window.webarSpeechRecognitionInstance) {

    function addEventHandlingToObject(object) {
      object.listeners = { };
      object.addEventListener = function(eventType, callback) {
        if (!callback) {
          return this;
        }
        var listeners = this.listeners[eventType];
        if (!listeners) {
          this.listeners[eventType] = listeners = [];
        }
        if (listeners.indexOf(callback) < 0) {
          listeners.push(callback);
        }
        return this;
      };
      object.removeEventListener = function(eventType, callback) {
        if (!callback) {
          return this;
        }
        var listeners = this.listeners[eventType];
        if (listeners) {
          var i = listeners.indexOf(callback);
          if (i >= 0) {
            this.listeners[eventType] = listeners.splice(i, 1);
          }
        }
        return this;
      };
      object.callEventListeners = function(eventType, event) {
        if (!event) {
          event = { target : this };
        }
        if (!event.target) {
          event.target = this;
        }
        event.type = eventType;
        var onEventType = 'on' + eventType;
        if (typeof(this[onEventType]) === 'function') {
          this[onEventType](event)
        }
        var listeners = this.listeners[eventType];
        if (listeners) {
          for (var i = 0; i < listeners.length; i++) {
            var typeofListener = typeof(listeners[i]);
            if (typeofListener === 'object') {
              listeners[i].handleEvent(event);
            }
            else if (typeofListener === 'function') {
              listeners[i](event);
            }
          }
        }
        return this;
      };
    } 

    addEventHandlingToObject(window.webarSpeechRecognitionInstance);
    var originalWebKitSpeechRecognition = window.webkitSpeechRecognition;
    window.webkitSpeechRecognition = function() {
      return window.webarSpeechRecognitionInstance;
    };
  }
})();