466 lines
17 KiB
JavaScript
466 lines
17 KiB
JavaScript
/*!
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* https://github.com/es-shims/es5-shim
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* @license es5-shim Copyright 2009-2014 by contributors, MIT License
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* see https://github.com/es-shims/es5-shim/blob/master/LICENSE
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*/
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// vim: ts=4 sts=4 sw=4 expandtab
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//Add semicolon to prevent IIFE from being passed as argument to concated code.
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;
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// Module systems magic dance
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(function (definition) {
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// RequireJS
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if (typeof define === "function") {
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define(definition);
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// YUI3
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} else if (typeof YUI === "function") {
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YUI.add("es5-sham", definition);
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// CommonJS and <script>
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} else {
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definition();
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}
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})(function () {
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var call = Function.prototype.call;
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var prototypeOfObject = Object.prototype;
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var owns = call.bind(prototypeOfObject.hasOwnProperty);
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// If JS engine supports accessors creating shortcuts.
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var defineGetter;
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var defineSetter;
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var lookupGetter;
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var lookupSetter;
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var supportsAccessors;
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if ((supportsAccessors = owns(prototypeOfObject, "__defineGetter__"))) {
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defineGetter = call.bind(prototypeOfObject.__defineGetter__);
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defineSetter = call.bind(prototypeOfObject.__defineSetter__);
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lookupGetter = call.bind(prototypeOfObject.__lookupGetter__);
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lookupSetter = call.bind(prototypeOfObject.__lookupSetter__);
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}
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// ES5 15.2.3.2
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// http://es5.github.com/#x15.2.3.2
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if (!Object.getPrototypeOf) {
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// https://github.com/es-shims/es5-shim/issues#issue/2
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// http://ejohn.org/blog/objectgetprototypeof/
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// recommended by fschaefer on github
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//
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// sure, and webreflection says ^_^
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// ... this will nerever possibly return null
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// ... Opera Mini breaks here with infinite loops
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Object.getPrototypeOf = function getPrototypeOf(object) {
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var proto = object.__proto__;
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if (proto || proto === null) {
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return proto;
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} else if (object.constructor) {
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return object.constructor.prototype;
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} else {
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return prototypeOfObject;
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}
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};
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}
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//ES5 15.2.3.3
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//http://es5.github.com/#x15.2.3.3
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function doesGetOwnPropertyDescriptorWork(object) {
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try {
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object.sentinel = 0;
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return Object.getOwnPropertyDescriptor(
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object,
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"sentinel"
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).value === 0;
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} catch (exception) {
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// returns falsy
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}
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}
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//check whether getOwnPropertyDescriptor works if it's given. Otherwise,
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//shim partially.
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if (Object.defineProperty) {
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var getOwnPropertyDescriptorWorksOnObject = doesGetOwnPropertyDescriptorWork({});
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var getOwnPropertyDescriptorWorksOnDom = typeof document === "undefined" ||
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doesGetOwnPropertyDescriptorWork(document.createElement("div"));
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if (!getOwnPropertyDescriptorWorksOnDom || !getOwnPropertyDescriptorWorksOnObject) {
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var getOwnPropertyDescriptorFallback = Object.getOwnPropertyDescriptor;
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}
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}
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if (!Object.getOwnPropertyDescriptor || getOwnPropertyDescriptorFallback) {
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var ERR_NON_OBJECT = "Object.getOwnPropertyDescriptor called on a non-object: ";
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Object.getOwnPropertyDescriptor = function getOwnPropertyDescriptor(object, property) {
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if ((typeof object !== "object" && typeof object !== "function") || object === null) {
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throw new TypeError(ERR_NON_OBJECT + object);
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}
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// make a valiant attempt to use the real getOwnPropertyDescriptor
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// for I8's DOM elements.
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if (getOwnPropertyDescriptorFallback) {
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try {
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return getOwnPropertyDescriptorFallback.call(Object, object, property);
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} catch (exception) {
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// try the shim if the real one doesn't work
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}
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}
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// If object does not owns property return undefined immediately.
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if (!owns(object, property)) {
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return;
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}
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// If object has a property then it's for sure both `enumerable` and
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// `configurable`.
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var descriptor = { enumerable: true, configurable: true };
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// If JS engine supports accessor properties then property may be a
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// getter or setter.
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if (supportsAccessors) {
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// Unfortunately `__lookupGetter__` will return a getter even
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// if object has own non getter property along with a same named
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// inherited getter. To avoid misbehavior we temporary remove
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// `__proto__` so that `__lookupGetter__` will return getter only
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// if it's owned by an object.
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var prototype = object.__proto__;
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var notPrototypeOfObject = object !== prototypeOfObject;
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// avoid recursion problem, breaking in Opera Mini when
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// Object.getOwnPropertyDescriptor(Object.prototype, 'toString')
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// or any other Object.prototype accessor
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if (notPrototypeOfObject) {
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object.__proto__ = prototypeOfObject;
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}
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var getter = lookupGetter(object, property);
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var setter = lookupSetter(object, property);
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if (notPrototypeOfObject) {
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// Once we have getter and setter we can put values back.
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object.__proto__ = prototype;
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}
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if (getter || setter) {
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if (getter) {
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descriptor.get = getter;
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}
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if (setter) {
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descriptor.set = setter;
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}
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// If it was accessor property we're done and return here
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// in order to avoid adding `value` to the descriptor.
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return descriptor;
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}
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}
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// If we got this far we know that object has an own property that is
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// not an accessor so we set it as a value and return descriptor.
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descriptor.value = object[property];
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descriptor.writable = true;
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return descriptor;
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};
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}
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// ES5 15.2.3.4
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// http://es5.github.com/#x15.2.3.4
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if (!Object.getOwnPropertyNames) {
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Object.getOwnPropertyNames = function getOwnPropertyNames(object) {
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return Object.keys(object);
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};
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}
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// ES5 15.2.3.5
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// http://es5.github.com/#x15.2.3.5
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if (!Object.create) {
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// Contributed by Brandon Benvie, October, 2012
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var createEmpty;
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var supportsProto = !({__proto__:null} instanceof Object);
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// the following produces false positives
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// in Opera Mini => not a reliable check
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// Object.prototype.__proto__ === null
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if (supportsProto || typeof document === 'undefined') {
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createEmpty = function () {
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return { "__proto__": null };
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};
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} else {
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// In old IE __proto__ can't be used to manually set `null`, nor does
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// any other method exist to make an object that inherits from nothing,
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// aside from Object.prototype itself. Instead, create a new global
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// object and *steal* its Object.prototype and strip it bare. This is
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// used as the prototype to create nullary objects.
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createEmpty = function () {
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var iframe = document.createElement('iframe');
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var parent = document.body || document.documentElement;
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iframe.style.display = 'none';
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parent.appendChild(iframe);
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iframe.src = 'javascript:';
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var empty = iframe.contentWindow.Object.prototype;
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parent.removeChild(iframe);
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iframe = null;
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delete empty.constructor;
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delete empty.hasOwnProperty;
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delete empty.propertyIsEnumerable;
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delete empty.isPrototypeOf;
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delete empty.toLocaleString;
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delete empty.toString;
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delete empty.valueOf;
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empty.__proto__ = null;
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function Empty() {}
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Empty.prototype = empty;
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// short-circuit future calls
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createEmpty = function () {
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return new Empty();
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};
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return new Empty();
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};
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}
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Object.create = function create(prototype, properties) {
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var object;
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function Type() {} // An empty constructor.
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if (prototype === null) {
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object = createEmpty();
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} else {
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if (typeof prototype !== "object" && typeof prototype !== "function") {
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// In the native implementation `parent` can be `null`
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// OR *any* `instanceof Object` (Object|Function|Array|RegExp|etc)
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// Use `typeof` tho, b/c in old IE, DOM elements are not `instanceof Object`
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// like they are in modern browsers. Using `Object.create` on DOM elements
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// is...err...probably inappropriate, but the native version allows for it.
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throw new TypeError("Object prototype may only be an Object or null"); // same msg as Chrome
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}
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Type.prototype = prototype;
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object = new Type();
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// IE has no built-in implementation of `Object.getPrototypeOf`
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// neither `__proto__`, but this manually setting `__proto__` will
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// guarantee that `Object.getPrototypeOf` will work as expected with
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// objects created using `Object.create`
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object.__proto__ = prototype;
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}
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if (properties !== void 0) {
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Object.defineProperties(object, properties);
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}
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return object;
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};
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}
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// ES5 15.2.3.6
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// http://es5.github.com/#x15.2.3.6
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// Patch for WebKit and IE8 standard mode
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// Designed by hax <hax.github.com>
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// related issue: https://github.com/es-shims/es5-shim/issues#issue/5
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// IE8 Reference:
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// http://msdn.microsoft.com/en-us/library/dd282900.aspx
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// http://msdn.microsoft.com/en-us/library/dd229916.aspx
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// WebKit Bugs:
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// https://bugs.webkit.org/show_bug.cgi?id=36423
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function doesDefinePropertyWork(object) {
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try {
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Object.defineProperty(object, "sentinel", {});
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return "sentinel" in object;
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} catch (exception) {
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// returns falsy
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}
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}
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// check whether defineProperty works if it's given. Otherwise,
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// shim partially.
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if (Object.defineProperty) {
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var definePropertyWorksOnObject = doesDefinePropertyWork({});
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var definePropertyWorksOnDom = typeof document === "undefined" ||
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doesDefinePropertyWork(document.createElement("div"));
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if (!definePropertyWorksOnObject || !definePropertyWorksOnDom) {
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var definePropertyFallback = Object.defineProperty,
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definePropertiesFallback = Object.defineProperties;
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}
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}
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if (!Object.defineProperty || definePropertyFallback) {
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var ERR_NON_OBJECT_DESCRIPTOR = "Property description must be an object: ";
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var ERR_NON_OBJECT_TARGET = "Object.defineProperty called on non-object: "
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var ERR_ACCESSORS_NOT_SUPPORTED = "getters & setters can not be defined " +
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"on this javascript engine";
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Object.defineProperty = function defineProperty(object, property, descriptor) {
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if ((typeof object !== "object" && typeof object !== "function") || object === null) {
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throw new TypeError(ERR_NON_OBJECT_TARGET + object);
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}
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if ((typeof descriptor !== "object" && typeof descriptor !== "function") || descriptor === null) {
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throw new TypeError(ERR_NON_OBJECT_DESCRIPTOR + descriptor);
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}
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// make a valiant attempt to use the real defineProperty
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// for I8's DOM elements.
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if (definePropertyFallback) {
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try {
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return definePropertyFallback.call(Object, object, property, descriptor);
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} catch (exception) {
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// try the shim if the real one doesn't work
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}
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}
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// If it's a data property.
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if (owns(descriptor, "value")) {
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// fail silently if "writable", "enumerable", or "configurable"
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// are requested but not supported
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/*
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// alternate approach:
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if ( // can't implement these features; allow false but not true
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!(owns(descriptor, "writable") ? descriptor.writable : true) ||
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!(owns(descriptor, "enumerable") ? descriptor.enumerable : true) ||
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!(owns(descriptor, "configurable") ? descriptor.configurable : true)
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)
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throw new RangeError(
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"This implementation of Object.defineProperty does not " +
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"support configurable, enumerable, or writable."
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);
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*/
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if (supportsAccessors && (lookupGetter(object, property) ||
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lookupSetter(object, property)))
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{
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// As accessors are supported only on engines implementing
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// `__proto__` we can safely override `__proto__` while defining
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// a property to make sure that we don't hit an inherited
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// accessor.
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var prototype = object.__proto__;
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object.__proto__ = prototypeOfObject;
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// Deleting a property anyway since getter / setter may be
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// defined on object itself.
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delete object[property];
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object[property] = descriptor.value;
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// Setting original `__proto__` back now.
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object.__proto__ = prototype;
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} else {
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object[property] = descriptor.value;
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}
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} else {
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if (!supportsAccessors) {
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throw new TypeError(ERR_ACCESSORS_NOT_SUPPORTED);
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}
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// If we got that far then getters and setters can be defined !!
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if (owns(descriptor, "get")) {
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defineGetter(object, property, descriptor.get);
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}
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if (owns(descriptor, "set")) {
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defineSetter(object, property, descriptor.set);
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}
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}
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return object;
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};
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}
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// ES5 15.2.3.7
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// http://es5.github.com/#x15.2.3.7
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if (!Object.defineProperties || definePropertiesFallback) {
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Object.defineProperties = function defineProperties(object, properties) {
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// make a valiant attempt to use the real defineProperties
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if (definePropertiesFallback) {
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try {
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return definePropertiesFallback.call(Object, object, properties);
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} catch (exception) {
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// try the shim if the real one doesn't work
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}
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}
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for (var property in properties) {
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if (owns(properties, property) && property !== "__proto__") {
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Object.defineProperty(object, property, properties[property]);
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}
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}
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return object;
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};
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}
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// ES5 15.2.3.8
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// http://es5.github.com/#x15.2.3.8
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if (!Object.seal) {
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Object.seal = function seal(object) {
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// this is misleading and breaks feature-detection, but
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// allows "securable" code to "gracefully" degrade to working
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// but insecure code.
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return object;
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};
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}
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// ES5 15.2.3.9
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// http://es5.github.com/#x15.2.3.9
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if (!Object.freeze) {
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Object.freeze = function freeze(object) {
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// this is misleading and breaks feature-detection, but
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// allows "securable" code to "gracefully" degrade to working
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// but insecure code.
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return object;
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};
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}
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// detect a Rhino bug and patch it
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try {
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Object.freeze(function () {});
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} catch (exception) {
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Object.freeze = (function freeze(freezeObject) {
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return function freeze(object) {
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if (typeof object === "function") {
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return object;
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} else {
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return freezeObject(object);
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}
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};
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})(Object.freeze);
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}
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// ES5 15.2.3.10
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// http://es5.github.com/#x15.2.3.10
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if (!Object.preventExtensions) {
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Object.preventExtensions = function preventExtensions(object) {
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// this is misleading and breaks feature-detection, but
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// allows "securable" code to "gracefully" degrade to working
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// but insecure code.
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return object;
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};
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}
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// ES5 15.2.3.11
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// http://es5.github.com/#x15.2.3.11
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if (!Object.isSealed) {
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Object.isSealed = function isSealed(object) {
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return false;
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};
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}
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// ES5 15.2.3.12
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// http://es5.github.com/#x15.2.3.12
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if (!Object.isFrozen) {
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Object.isFrozen = function isFrozen(object) {
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return false;
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};
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}
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// ES5 15.2.3.13
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// http://es5.github.com/#x15.2.3.13
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if (!Object.isExtensible) {
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Object.isExtensible = function isExtensible(object) {
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// 1. If Type(O) is not Object throw a TypeError exception.
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if (Object(object) !== object) {
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throw new TypeError(); // TODO message
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}
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// 2. Return the Boolean value of the [[Extensible]] internal property of O.
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var name = '';
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while (owns(object, name)) {
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name += '?';
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}
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object[name] = true;
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var returnValue = owns(object, name);
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delete object[name];
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return returnValue;
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};
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}
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});
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