review.tizen.org Git - platform/framework/web/crosswalk-tizen.git/blob

   1 'use strict';
   2
   3 var forEach    = require('es5-ext/object/for-each')
   4   , validValue = require('es5-ext/object/valid-object')
   5
   6   , push = Array.prototype.apply, defineProperty = Object.defineProperty
   7   , create = Object.create, hasOwnProperty = Object.prototype.hasOwnProperty
   8   , d = { configurable: true, enumerable: false, writable: true };
   9
  10 module.exports = function (e1, e2) {
  11         var data;
  12         (validValue(e1) && validValue(e2));
  13         if (!hasOwnProperty.call(e1, '__ee__')) {
  14                 if (!hasOwnProperty.call(e2, '__ee__')) {
  15                         d.value = create(null);
  16                         defineProperty(e1, '__ee__', d);
  17                         defineProperty(e2, '__ee__', d);
  18                         d.value = null;
  19                         return;
  20                 }
  21                 d.value = e2.__ee__;
  22                 defineProperty(e1, '__ee__', d);
  23                 d.value = null;
  24                 return;
  25         }
  26         data = d.value = e1.__ee__;
  27         if (!hasOwnProperty.call(e2, '__ee__')) {
  28                 defineProperty(e2, '__ee__', d);
  29                 d.value = null;
  30                 return;
  31         }
  32         if (data === e2.__ee__) return;
  33         forEach(e2.__ee__, function (listener, name) {
  34                 if (!data[name]) {
  35                         data[name] = listener;
  36                         return;
  37                 }
  38                 if (typeof data[name] === 'object') {
  39                         if (typeof listener === 'object') push.apply(data[name], listener);
  40                         else data[name].push(listener);
  41                 } else if (typeof listener === 'object') {
  42                         listener.unshift(data[name]);
  43                         data[name] = listener;
  44                 } else {
  45                         data[name] = [data[name], listener];
  46                 }
  47         });
  48         defineProperty(e2, '__ee__', d);
  49         d.value = null;
  50 };