legalize-browser.js

/*───────────────────────────────────────────────────────────────────────────*\
 │  Copyright (C) 2014 eBay Software Foundation                               │
 │                                                                            │
 │  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.                                            │
 \*───────────────────────────────────────────────────────────────────────────*/

/* global window */
/* global define */

(function (factory) {
    "use strict";

    if (typeof define === 'function' && define.amd) {
        define('Legalize', factory);
    } else {
        window.Legalize = factory();
    }

}(function (undefined) {
    "use strict";

    function isFunc(f) {
        return typeof f === 'function';
    }

    if (!Array.isArray) {
        Array.isArray = function (arg) {
            return Object.prototype.toString.call(arg) === '[object Array]';
        };
    }
    
    var ES5Object = {
        
        freeze: isFunc(Object.freeze) ? Object.freeze : function (x) {

            return x;
        },

        keys: isFunc(Object.keys) ? Object.keys : (function() {

            var hasOwnProperty = Object.prototype.hasOwnProperty;
            var hasDontEnumBug = !({ toString: null }).propertyIsEnumerable('toString');
            var dontEnums = [
                  'toString',
                  'toLocaleString',
                  'valueOf',
                  'hasOwnProperty',
                  'isPrototypeOf',
                  'propertyIsEnumerable',
                  'constructor'
                ];
            var dontEnumsLength = dontEnums.length;

            return function(obj) {
                var result = [], prop, i;

                for (prop in obj) {
                    if (hasOwnProperty.call(obj, prop)) {
                        result.push(prop);
                    }
                }

                if (hasDontEnumBug) {
                    for (i = 0; i < dontEnumsLength; i += 1) {
                        if (hasOwnProperty.call(obj, dontEnums[i])) {
                            result.push(dontEnums[i]);
                        }
                    }
                }
                return result;
            };
        }()),

        create: isFunc(Object.create) ? Object.create : function (object) {

            function F() {}
            F.prototype = object;

            return new F();
        }
    };

    return (function (Object) {

        /* jshint unused: false */

        /* global publiclyExposedInterface */

        return publiclyExposedInterface;
    }(ES5Object));
}));