/*!
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Copyright (c) 2011, Yahoo! Inc. All rights reserved.
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Code licensed under the BSD License:
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http://developer.yahoo.com/yui/license.html
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version: 2.9.0
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*/
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export var YAHOO = {};
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YAHOO.lang = {
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/**
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* Utility to set up the prototype, constructor and superclass properties to
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* support an inheritance strategy that can chain constructors and methods.
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* Static members will not be inherited.
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*
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* @method extend
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* @static
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* @param {Function} subc the object to modify
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* @param {Function} superc the object to inherit
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* @param {Object} overrides additional properties/methods to add to the
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* subclass prototype. These will override the
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* matching items obtained from the superclass
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* if present.
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*/
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extend: function (subc, superc, overrides) {
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if (!superc || !subc) {
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throw new Error("YAHOO.lang.extend failed, please check that " +
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"all dependencies are included.");
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}
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var F = function () { };
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F.prototype = superc.prototype;
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subc.prototype = new F();
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subc.prototype.constructor = subc;
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subc.superclass = superc.prototype;
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if (superc.prototype.constructor == Object.prototype.constructor) {
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superc.prototype.constructor = superc;
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}
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if (overrides) {
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var i;
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for (i in overrides) {
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subc.prototype[i] = overrides[i];
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}
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/*
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* IE will not enumerate native functions in a derived object even if the
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* function was overridden. This is a workaround for specific functions
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* we care about on the Object prototype.
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* @property _IEEnumFix
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* @param {Function} r the object to receive the augmentation
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* @param {Function} s the object that supplies the properties to augment
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* @static
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* @private
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*/
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var _IEEnumFix = function () { }, ADD = ["toString", "valueOf"];
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try {
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if (/MSIE/.test(navigator.userAgent)) {
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_IEEnumFix = function (r, s) {
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for (i = 0; i < ADD.length; i = i + 1) {
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var fname = ADD[i], f = s[fname];
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if (typeof f === 'function' && f != Object.prototype[fname]) {
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r[fname] = f;
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}
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}
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};
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}
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}
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catch (ex) { }
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;
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_IEEnumFix(subc.prototype, overrides);
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}
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}
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};
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