02.object.js

// 15.2.3 Properties of the Object Constructor

// 15.2.3.2 Object.getPrototypeOf ( O )

Object.getPrototypeOf = function (O) {
 if (!@IsObject(O)) throw TypeError("Invalid arguments: Object.getPrototypeOf");

 return @GetInternalProperty(O, "Prototype");
};
@NoConstructor(Object.getPrototypeOf);

// 15.2.3.3 Object.getOwnPropertyDescriptor ( O, P )

Object.getOwnPropertyDescriptor = function (O, P) {
 if (!@IsObject(O)) throw TypeError("Invalid arguments: Object.getOwnPropertyDescriptor");

 return @FromPropertyDescriptor(@GetOwnProperty(O, @ToString(P)));
};
@NoConstructor(Object.getOwnPropertyDescriptor);

// 15.2.3.4 Object.getOwnPropertyNames ( O )

Object.getOwnPropertyNames = function (O) {
 if (!@IsObject(O)) throw TypeError("Invalid arguments: Object.getOwnPropertyNames");

 return @ObjectGetOwnPropertyNames(O);
};
@NoConstructor(Object.getOwnPropertyNames);

// 15.2.3.5 Object.create ( O [, Properties] )

Object.create = function (O, Properties) {
 if (!(@IsObject(O) || O === null)) throw TypeError("Invalid arguments: Object.create");

 // Step 2
 var obj = new Object();

 // Step 3
 @SetInternalProperty(obj, "Prototype", O);

 // Step 4
 if (Properties !== undefined) {
 Object.defineProperties(obj, Properties);
 }

 return obj;
};
@NoConstructor(Object.create);

// 15.2.3.6 Object.defineProperty ( O, P, Attributes )

Object.defineProperty = function (O, P, Attributes) {
 if (!@IsObject(O)) throw TypeError("Invalid arguments: Object.defineProperty");

 @DefineOwnProperty(O, @ToString(P), @ToPropertyDescriptor(Attributes), true);
 return O;
};
@NoConstructor(Object.defineProperty);

// 15.2.3.7 Object.defineProperties ( O, Properties )

Object.defineProperties = function (O, Properties) {
 if (!@IsObject(O)) throw TypeError("Invalid arguments: Object.defineProperties");

 // Step 2-6
 for (var name in Properties) {
 if (Properties.hasOwnProperty(name)) {
 Object.defineProperty(O, name, Properties[name]);
 }
 }
 return O;
};
@NoConstructor(Object.defineProperties);

// 15.2.3.8 Object.seal ( O )

Object.seal = function (O) {
 if (!@IsObject(O)) throw TypeError("Invalid arguments: Object.seal");

 // Step 2
 var names = Object.getOwnPropertyNames(O);
 for (var i = 0; i < names.length; ++i) {
 var desc = Object.getOwnPropertyDescriptor(O, names[i]);
 desc.configurable = false;
 Object.defineProperty(O, names[i], desc);
 }

 // Step 3
 @SetInternalProperty(O, "Extensible", false);

 return O;
};
@NoConstructor(Object.seal);

// 15.2.3.9 Object.freeze ( O )

Object.freeze = function (O) {
 if (!@IsObject(O)) throw TypeError("Invalid arguments: Object.freeze");

 // Step 2
 var names = Object.getOwnPropertyNames(O);
 for (var i = 0; i < names.length; ++i) {
 var desc = Object.getOwnPropertyDescriptor(O, names[i]);
 if (desc.hasOwnProperty("value") || desc.hasOwnProperty("writable")) {
 desc.writable = false;
 }
 desc.configurable = false;
 Object.defineProperty(O, names[i], desc);
 }

 // Step 3
 @SetInternalProperty(O, "Extensible", false);

 return O;
};
@NoConstructor(Object.freeze);

// 15.2.3.10 Object.preventExtensions ( O )

Object.preventExtensions = function (O) {
 if (!@IsObject(O)) throw TypeError("Invalid arguments: Object.preventExtensions");

 @SetInternalProperty(O, "Extensible", false);
 return O;
};
@NoConstructor(Object.preventExtensions);

// 15.2.3.11 Object.isSealed ( O )

Object.isSealed = function (O) {
 if (!@IsObject(O)) throw TypeError("Invalid arguments: Object.isSealed");

 // Step 2
 var names = Object.getOwnPropertyNames(O);
 for (var i = 0; i < names.length; ++i) {
 var desc = Object.getOwnPropertyDescriptor(O, names[i]);
 if (desc.configurable) {
 return false;
 }
 }

 // Step 4
 if (@GetInternalProperty(O, "Extensible")) {
 return false;
 }

 // Step 3
 return true;
};
@NoConstructor(Object.isSealed);

// 15.2.3.12 Object.isFrozen ( O )

Object.isFrozen = function (O) {
 if (!@IsObject(O)) throw TypeError("Invalid arguments: Object.isFrozen");

 // Step 2
 var names = Object.getOwnPropertyNames(O);
 for (var i = 0; i < names.length; ++i) {
 var desc = Object.getOwnPropertyDescriptor(O, names[i]);
 if (desc.hasOwnProperty("value") || desc.hasOwnProperty("writable")) {
 if (desc.writable) {
 return false;
 }
 }
 if (desc.configurable) {
 return false;
 }
 }

 // Step 4
 if (@GetInternalProperty(O, "Extensible")) {
 return false;
 }

 // Step 3
 return true;
};
@NoConstructor(Object.isFrozen);

// 15.2.3.13 Object.isExtensible ( O )

Object.isExtensible = function (O) {
 if (!@IsObject(O)) throw TypeError("Invalid arguments: Object.isExtensible");

 return @GetInternalProperty(O, "Extensible");
};
@NoConstructor(Object.isExtensible);

// 15.2.3.14 Object.keys ( O )

Object.keys = function (O) {
 if (!@IsObject(O)) throw TypeError("Invalid arguments: Object.keys");

 var names = new Array();
 for (var name in O) {
 if (O.hasOwnProperty(name)) {
 names.push(name);
 }
 }
 return names;
};
@NoConstructor(Object.keys);

// 15.2.4 Properties of the Object Prototype Object

// 15.2.4.2 Object.prototype.toString ( )

Object.prototype.toString = function () {
 switch (this) {
 case undefined:
 return "[object Undefined]";
 case null:
 return "[object Null]";
 default:
 return "[object " + @GetInternalProperty(@ToObject(this), "Class") + "]";
 }
};
@NoConstructor(Object.prototype.toString);

// 15.2.4.3 Object.prototype.toLocaleString ( )

Object.prototype.toLocaleString = function () {
 return @ToObject(this).toString();
};
@NoConstructor(Object.prototype.toLocaleString);

// 15.2.4.4 Object.prototype.valueOf ( )

Object.prototype.valueOf = function () {
 // NOTE: Step 2 is ignored since we have no host objects.
 return @ToObject(this);
};
@NoConstructor(Object.prototype.valueOf);

// 15.2.4.5 Object.prototype.hasOwnProperty (V)

Object.prototype.hasOwnProperty = function (V) {
 // Step 1-3
 var desc = Object.getOwnPropertyDescriptor(@ToObject(this), @ToString(V));

 // Step 4
 if (desc === undefined) {
 return false;
 }

 // Step 5
 return true;
};
@NoConstructor(Object.prototype.hasOwnProperty);

// 15.2.4.6 Object.prototype.isPrototypeOf (V)

Object.prototype.isPrototypeOf = function (V) {
 if (!@IsObject(V)) {
 return false;
 }

 var o = @ToObject(this);
 while (true) {
 V = Object.getPrototypeOf(V);
 if (V === null) {
 return false;
 }
 if (V === o) {
 return true;
 }
 }
};
@NoConstructor(Object.prototype.isPrototypeOf);

// 15.2.4.7 Object.prototype.propertyIsEnumerable (V)

Object.prototype.propertyIsEnumerable = function (V) {
 // Step 1-3
 var desc = Object.getOwnPropertyDescriptor(@ToObject(this), @ToString(V));

 // Step 4
 if (desc === undefined) {
 return false;
 }

 // Step 5
 return desc.enumerable;
};
@NoConstructor(Object.prototype.propertyIsEnumerable);