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'use strict';
// modified from https://github.com/es-shims/es5-shim
var has = Object.prototype.hasOwnProperty;
var toStr = Object.prototype.toString;
var slice = Array.prototype.slice;
var isArgs = require('./isArguments');
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,
$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;
}
};
var 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;
};
keysShim.shim = function shimObjectKeys() {
if (Object.keys) {
var keysWorksWithArguments = (function () {
// Safari 5.0 bug
return (Object.keys(arguments) || '').length === 2;
}(1, 2));
if (!keysWorksWithArguments) {
var originalKeys = Object.keys;
Object.keys = function keys(object) { // eslint-disable-line func-name-matching
if (isArgs(object)) {
return originalKeys(slice.call(object));
} else {
return originalKeys(object);
}
};
}
} else {
Object.keys = keysShim;
}
return Object.keys || keysShim;
};
module.exports = keysShim;
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