diff options
Diffstat (limited to 'third_party/webkit/PerformanceTests/Speedometer/resources/flightjs-example-app/components/es5-shim/es5-sham.js')
| -rw-r--r-- | third_party/webkit/PerformanceTests/Speedometer/resources/flightjs-example-app/components/es5-shim/es5-sham.js | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/third_party/webkit/PerformanceTests/Speedometer/resources/flightjs-example-app/components/es5-shim/es5-sham.js b/third_party/webkit/PerformanceTests/Speedometer/resources/flightjs-example-app/components/es5-shim/es5-sham.js new file mode 100644 index 0000000000..a1b46cbc1f --- /dev/null +++ b/third_party/webkit/PerformanceTests/Speedometer/resources/flightjs-example-app/components/es5-shim/es5-sham.js @@ -0,0 +1,326 @@ +// Copyright 2009-2012 by contributors, MIT License +// vim: ts=4 sts=4 sw=4 expandtab + +// Module systems magic dance +(function (definition) { + // RequireJS + if (typeof define == "function") { + define(definition); + // YUI3 + } else if (typeof YUI == "function") { + YUI.add("es5-sham", definition); + // CommonJS and <script> + } else { + definition(); + } +})(function () { + +// ES5 15.2.3.2 +// http://es5.github.com/#x15.2.3.2 +if (!Object.getPrototypeOf) { + // https://github.com/kriskowal/es5-shim/issues#issue/2 + // http://ejohn.org/blog/objectgetprototypeof/ + // recommended by fschaefer on github + Object.getPrototypeOf = function getPrototypeOf(object) { + return object.__proto__ || ( + object.constructor + ? object.constructor.prototype + : prototypeOfObject + ); + }; +} + +// ES5 15.2.3.3 +// http://es5.github.com/#x15.2.3.3 +if (!Object.getOwnPropertyDescriptor) { + var ERR_NON_OBJECT = "Object.getOwnPropertyDescriptor called on a non-object: "; + + Object.getOwnPropertyDescriptor = function getOwnPropertyDescriptor(object, property) { + if ((typeof object != "object" && typeof object != "function") || object === null) { + throw new TypeError(ERR_NON_OBJECT + object); + } + // If object does not owns property return undefined immediately. + if (!owns(object, property)) { + return; + } + + // If object has a property then it's for sure both `enumerable` and + // `configurable`. + var descriptor = { enumerable: true, configurable: true }; + + // If JS engine supports accessor properties then property may be a + // getter or setter. + if (supportsAccessors) { + // Unfortunately `__lookupGetter__` will return a getter even + // if object has own non getter property along with a same named + // inherited getter. To avoid misbehavior we temporary remove + // `__proto__` so that `__lookupGetter__` will return getter only + // if it's owned by an object. + var prototype = object.__proto__; + object.__proto__ = prototypeOfObject; + + var getter = lookupGetter(object, property); + var setter = lookupSetter(object, property); + + // Once we have getter and setter we can put values back. + object.__proto__ = prototype; + + if (getter || setter) { + if (getter) { + descriptor.get = getter; + } + if (setter) { + descriptor.set = setter; + } + // If it was accessor property we're done and return here + // in order to avoid adding `value` to the descriptor. + return descriptor; + } + } + + // If we got this far we know that object has an own property that is + // not an accessor so we set it as a value and return descriptor. + descriptor.value = object[property]; + return descriptor; + }; +} + +// ES5 15.2.3.4 +// http://es5.github.com/#x15.2.3.4 +if (!Object.getOwnPropertyNames) { + Object.getOwnPropertyNames = function getOwnPropertyNames(object) { + return Object.keys(object); + }; +} + +// ES5 15.2.3.5 +// http://es5.github.com/#x15.2.3.5 +if (!Object.create) { + Object.create = function create(prototype, properties) { + var object; + if (prototype === null) { + object = { "__proto__": null }; + } else { + if (typeof prototype != "object") { + throw new TypeError("typeof prototype["+(typeof prototype)+"] != 'object'"); + } + var Type = function () {}; + Type.prototype = prototype; + object = new Type(); + // IE has no built-in implementation of `Object.getPrototypeOf` + // neither `__proto__`, but this manually setting `__proto__` will + // guarantee that `Object.getPrototypeOf` will work as expected with + // objects created using `Object.create` + object.__proto__ = prototype; + } + if (properties !== void 0) { + Object.defineProperties(object, properties); + } + return object; + }; +} + +// ES5 15.2.3.6 +// http://es5.github.com/#x15.2.3.6 + +// Patch for WebKit and IE8 standard mode +// Designed by hax <hax.github.com> +// related issue: https://github.com/kriskowal/es5-shim/issues#issue/5 +// IE8 Reference: +// http://msdn.microsoft.com/en-us/library/dd282900.aspx +// http://msdn.microsoft.com/en-us/library/dd229916.aspx +// WebKit Bugs: +// https://bugs.webkit.org/show_bug.cgi?id=36423 + +function doesDefinePropertyWork(object) { + try { + Object.defineProperty(object, "sentinel", {}); + return "sentinel" in object; + } catch (exception) { + // returns falsy + } +} + +// check whether defineProperty works if it's given. Otherwise, +// shim partially. +if (Object.defineProperty) { + var definePropertyWorksOnObject = doesDefinePropertyWork({}); + var definePropertyWorksOnDom = typeof document == "undefined" || + doesDefinePropertyWork(document.createElement("div")); + if (!definePropertyWorksOnObject || !definePropertyWorksOnDom) { + var definePropertyFallback = Object.defineProperty; + } +} + +if (!Object.defineProperty || definePropertyFallback) { + var ERR_NON_OBJECT_DESCRIPTOR = "Property description must be an object: "; + var ERR_NON_OBJECT_TARGET = "Object.defineProperty called on non-object: " + var ERR_ACCESSORS_NOT_SUPPORTED = "getters & setters can not be defined " + + "on this javascript engine"; + + Object.defineProperty = function defineProperty(object, property, descriptor) { + if ((typeof object != "object" && typeof object != "function") || object === null) { + throw new TypeError(ERR_NON_OBJECT_TARGET + object); + } + if ((typeof descriptor != "object" && typeof descriptor != "function") || descriptor === null) { + throw new TypeError(ERR_NON_OBJECT_DESCRIPTOR + descriptor); + } + // make a valiant attempt to use the real defineProperty + // for I8's DOM elements. + if (definePropertyFallback) { + try { + return definePropertyFallback.call(Object, object, property, descriptor); + } catch (exception) { + // try the shim if the real one doesn't work + } + } + + // If it's a data property. + if (owns(descriptor, "value")) { + // fail silently if "writable", "enumerable", or "configurable" + // are requested but not supported + /* + // alternate approach: + if ( // can't implement these features; allow false but not true + !(owns(descriptor, "writable") ? descriptor.writable : true) || + !(owns(descriptor, "enumerable") ? descriptor.enumerable : true) || + !(owns(descriptor, "configurable") ? descriptor.configurable : true) + ) + throw new RangeError( + "This implementation of Object.defineProperty does not " + + "support configurable, enumerable, or writable." + ); + */ + + if (supportsAccessors && (lookupGetter(object, property) || + lookupSetter(object, property))) + { + // As accessors are supported only on engines implementing + // `__proto__` we can safely override `__proto__` while defining + // a property to make sure that we don't hit an inherited + // accessor. + var prototype = object.__proto__; + object.__proto__ = prototypeOfObject; + // Deleting a property anyway since getter / setter may be + // defined on object itself. + delete object[property]; + object[property] = descriptor.value; + // Setting original `__proto__` back now. + object.__proto__ = prototype; + } else { + object[property] = descriptor.value; + } + } else { + if (!supportsAccessors) { + throw new TypeError(ERR_ACCESSORS_NOT_SUPPORTED); + } + // If we got that far then getters and setters can be defined !! + if (owns(descriptor, "get")) { + defineGetter(object, property, descriptor.get); + } + if (owns(descriptor, "set")) { + defineSetter(object, property, descriptor.set); + } + } + return object; + }; +} + +// ES5 15.2.3.7 +// http://es5.github.com/#x15.2.3.7 +if (!Object.defineProperties) { + Object.defineProperties = function defineProperties(object, properties) { + for (var property in properties) { + if (owns(properties, property) && property != "__proto__") { + Object.defineProperty(object, property, properties[property]); + } + } + return object; + }; +} + +// ES5 15.2.3.8 +// http://es5.github.com/#x15.2.3.8 +if (!Object.seal) { + Object.seal = function seal(object) { + // this is misleading and breaks feature-detection, but + // allows "securable" code to "gracefully" degrade to working + // but insecure code. + return object; + }; +} + +// ES5 15.2.3.9 +// http://es5.github.com/#x15.2.3.9 +if (!Object.freeze) { + Object.freeze = function freeze(object) { + // this is misleading and breaks feature-detection, but + // allows "securable" code to "gracefully" degrade to working + // but insecure code. + return object; + }; +} + +// detect a Rhino bug and patch it +try { + Object.freeze(function () {}); +} catch (exception) { + Object.freeze = (function freeze(freezeObject) { + return function freeze(object) { + if (typeof object == "function") { + return object; + } else { + return freezeObject(object); + } + }; + })(Object.freeze); +} + +// ES5 15.2.3.10 +// http://es5.github.com/#x15.2.3.10 +if (!Object.preventExtensions) { + Object.preventExtensions = function preventExtensions(object) { + // this is misleading and breaks feature-detection, but + // allows "securable" code to "gracefully" degrade to working + // but insecure code. + return object; + }; +} + +// ES5 15.2.3.11 +// http://es5.github.com/#x15.2.3.11 +if (!Object.isSealed) { + Object.isSealed = function isSealed(object) { + return false; + }; +} + +// ES5 15.2.3.12 +// http://es5.github.com/#x15.2.3.12 +if (!Object.isFrozen) { + Object.isFrozen = function isFrozen(object) { + return false; + }; +} + +// ES5 15.2.3.13 +// http://es5.github.com/#x15.2.3.13 +if (!Object.isExtensible) { + Object.isExtensible = function isExtensible(object) { + // 1. If Type(O) is not Object throw a TypeError exception. + if (Object(object) !== object) { + throw new TypeError(); // TODO message + } + // 2. Return the Boolean value of the [[Extensible]] internal property of O. + var name = ''; + while (owns(object, name)) { + name += '?'; + } + object[name] = true; + var returnValue = owns(object, name); + delete object[name]; + return returnValue; + }; +} + +}); |