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