source: imaps-frontend/node_modules/object-keys/implementation.js

'use strict';

var keysShim;
if (!Object.keys) {
        // modified from https://github.com/es-shims/es5-shim
        var has = Object.prototype.hasOwnProperty;
        var toStr = Object.prototype.toString;
        var isArgs = require('./isArguments'); // eslint-disable-line global-require
        var isEnumerable = Object.prototype.propertyIsEnumerable;
        var hasDontEnumBug = !isEnumerable.call({ toString: null }, 'toString');
        var hasProtoEnumBug = isEnumerable.call(function () {}, 'prototype');
        var dontEnums = [
                'toString',
                'toLocaleString',
                'valueOf',
                'hasOwnProperty',
                'isPrototypeOf',
                'propertyIsEnumerable',
                'constructor'
        ];
        var equalsConstructorPrototype = function (o) {
                var ctor = o.constructor;
                return ctor && ctor.prototype === o;
        };
        var excludedKeys = {
                $applicationCache: true,
                $console: true,
                $external: true,
                $frame: true,
                $frameElement: true,
                $frames: true,
                $innerHeight: true,
                $innerWidth: true,
                $onmozfullscreenchange: true,
                $onmozfullscreenerror: true,
                $outerHeight: true,
                $outerWidth: true,
                $pageXOffset: true,
                $pageYOffset: true,
                $parent: true,
                $scrollLeft: true,
                $scrollTop: true,
                $scrollX: true,
                $scrollY: true,
                $self: true,
                $webkitIndexedDB: true,
                $webkitStorageInfo: true,
                $window: true
        };
        var hasAutomationEqualityBug = (function () {
                /* global window */
                if (typeof window === 'undefined') { return false; }
                for (var k in window) {
                        try {
                                if (!excludedKeys['$' + k] && has.call(window, k) && window[k] !== null && typeof window[k] === 'object') {
                                        try {
                                                equalsConstructorPrototype(window[k]);
                                        } catch (e) {
                                                return true;
                                        }
                                }
                        } catch (e) {
                                return true;
                        }
                }
                return false;
        }());
        var equalsConstructorPrototypeIfNotBuggy = function (o) {
                /* global window */
                if (typeof window === 'undefined' || !hasAutomationEqualityBug) {
                        return equalsConstructorPrototype(o);
                }
                try {
                        return equalsConstructorPrototype(o);
                } catch (e) {
                        return false;
                }
        };

        keysShim = function keys(object) {
                var isObject = object !== null && typeof object === 'object';
                var isFunction = toStr.call(object) === '[object Function]';
                var isArguments = isArgs(object);
                var isString = isObject && toStr.call(object) === '[object String]';
                var theKeys = [];

                if (!isObject && !isFunction && !isArguments) {
                        throw new TypeError('Object.keys called on a non-object');
                }

                var skipProto = hasProtoEnumBug && isFunction;
                if (isString && object.length > 0 && !has.call(object, 0)) {
                        for (var i = 0; i < object.length; ++i) {
                                theKeys.push(String(i));
                        }
                }

                if (isArguments && object.length > 0) {
                        for (var j = 0; j < object.length; ++j) {
                                theKeys.push(String(j));
                        }
                } else {
                        for (var name in object) {
                                if (!(skipProto && name === 'prototype') && has.call(object, name)) {
                                        theKeys.push(String(name));
                                }
                        }
                }

                if (hasDontEnumBug) {
                        var skipConstructor = equalsConstructorPrototypeIfNotBuggy(object);

                        for (var k = 0; k < dontEnums.length; ++k) {
                                if (!(skipConstructor && dontEnums[k] === 'constructor') && has.call(object, dontEnums[k])) {
                                        theKeys.push(dontEnums[k]);
                                }
                        }
                }
                return theKeys;
        };
}
module.exports = keysShim;