142 lines
3.5 KiB
JavaScript
142 lines
3.5 KiB
JavaScript
'use strict';
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// modified from https://github.com/es-shims/es5-shim
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var has = Object.prototype.hasOwnProperty;
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var toStr = Object.prototype.toString;
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var slice = Array.prototype.slice;
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var isArgs = require('./isArguments');
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var isEnumerable = Object.prototype.propertyIsEnumerable;
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var hasDontEnumBug = !isEnumerable.call({ toString: null }, 'toString');
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var hasProtoEnumBug = isEnumerable.call(function () {}, 'prototype');
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var dontEnums = [
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'toString',
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'toLocaleString',
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'valueOf',
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'hasOwnProperty',
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'isPrototypeOf',
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'propertyIsEnumerable',
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'constructor'
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];
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var equalsConstructorPrototype = function (o) {
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var ctor = o.constructor;
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return ctor && ctor.prototype === o;
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};
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var excludedKeys = {
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$applicationCache: true,
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$console: true,
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$external: true,
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$frame: true,
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$frameElement: true,
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$frames: true,
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$innerHeight: true,
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$innerWidth: true,
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$outerHeight: true,
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$outerWidth: true,
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$pageXOffset: true,
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$pageYOffset: true,
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$parent: true,
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$scrollLeft: true,
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$scrollTop: true,
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$scrollX: true,
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$scrollY: true,
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$self: true,
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$webkitIndexedDB: true,
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$webkitStorageInfo: true,
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$window: true
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};
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var hasAutomationEqualityBug = (function () {
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/* global window */
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if (typeof window === 'undefined') { return false; }
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for (var k in window) {
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try {
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if (!excludedKeys['$' + k] && has.call(window, k) && window[k] !== null && typeof window[k] === 'object') {
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try {
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equalsConstructorPrototype(window[k]);
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} catch (e) {
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return true;
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}
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}
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} catch (e) {
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return true;
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}
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}
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return false;
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}());
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var equalsConstructorPrototypeIfNotBuggy = function (o) {
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/* global window */
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if (typeof window === 'undefined' || !hasAutomationEqualityBug) {
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return equalsConstructorPrototype(o);
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}
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try {
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return equalsConstructorPrototype(o);
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} catch (e) {
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return false;
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}
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};
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var keysShim = function keys(object) {
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var isObject = object !== null && typeof object === 'object';
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var isFunction = toStr.call(object) === '[object Function]';
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var isArguments = isArgs(object);
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var isString = isObject && toStr.call(object) === '[object String]';
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var theKeys = [];
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if (!isObject && !isFunction && !isArguments) {
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throw new TypeError('Object.keys called on a non-object');
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}
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var skipProto = hasProtoEnumBug && isFunction;
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if (isString && object.length > 0 && !has.call(object, 0)) {
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for (var i = 0; i < object.length; ++i) {
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theKeys.push(String(i));
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}
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}
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if (isArguments && object.length > 0) {
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for (var j = 0; j < object.length; ++j) {
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theKeys.push(String(j));
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}
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} else {
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for (var name in object) {
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if (!(skipProto && name === 'prototype') && has.call(object, name)) {
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theKeys.push(String(name));
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}
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}
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}
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if (hasDontEnumBug) {
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var skipConstructor = equalsConstructorPrototypeIfNotBuggy(object);
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for (var k = 0; k < dontEnums.length; ++k) {
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if (!(skipConstructor && dontEnums[k] === 'constructor') && has.call(object, dontEnums[k])) {
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theKeys.push(dontEnums[k]);
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}
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}
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}
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return theKeys;
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};
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keysShim.shim = function shimObjectKeys() {
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if (Object.keys) {
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var keysWorksWithArguments = (function () {
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// Safari 5.0 bug
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return (Object.keys(arguments) || '').length === 2;
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}(1, 2));
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if (!keysWorksWithArguments) {
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var originalKeys = Object.keys;
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Object.keys = function keys(object) { // eslint-disable-line func-name-matching
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if (isArgs(object)) {
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return originalKeys(slice.call(object));
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} else {
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return originalKeys(object);
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}
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};
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}
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} else {
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Object.keys = keysShim;
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}
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return Object.keys || keysShim;
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};
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module.exports = keysShim;
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