Changeset 48568 in webkit for trunk/JavaScriptCore/runtime/ObjectConstructor.cpp

Timestamp:

Sep 19, 2009, 6:13:51 PM (16 years ago)

Author:

[email protected]

Message:

Implement ES5 Object.create function
​https://bugs.webkit.org/show_bug.cgi?id=29524

Reviewed by Maciej Stachowiak

Implement Object.create. Very simple patch, effectively Object.defineProperties
only creating the target object itself.

File:

• trunk/JavaScriptCore/runtime/ObjectConstructor.cpp (modified) (3 diffs)

trunk/JavaScriptCore/runtime/ObjectConstructor.cpp

@@ -40 +40 @@
 static JSValue JSC_HOST_CALL objectConstructorDefineProperty(ExecState*, JSObject*, JSValue, const ArgList&);
 static JSValue JSC_HOST_CALL objectConstructorDefineProperties(ExecState*, JSObject*, JSValue, const ArgList&);
+static JSValue JSC_HOST_CALL objectConstructorCreate(ExecState*, JSObject*, JSValue, const ArgList&);
 
 ObjectConstructor::ObjectConstructor(ExecState* exec, PassRefPtr<Structure> structure, ObjectPrototype* objectPrototype, Structure* prototypeFunctionStructure)
@@ -55 +56 @@
     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, prototypeFunctionStructure, 3, exec->propertyNames().defineProperty, objectConstructorDefineProperty), DontEnum);
     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, prototypeFunctionStructure, 2, exec->propertyNames().defineProperties, objectConstructorDefineProperties), DontEnum);
+    putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, prototypeFunctionStructure, 2, exec->propertyNames().create, objectConstructorCreate), DontEnum);
 }
 
@@ -283 +285 @@
 }
 
+JSValue JSC_HOST_CALL objectConstructorCreate(ExecState* exec, JSObject*, JSValue, const ArgList& args)
+{
+    if (!args.at(0).isObject() && !args.at(0).isNull())
+        return throwError(exec, TypeError, "Object prototype may only be an Object or null.");
+    JSObject* newObject = constructEmptyObject(exec);
+    newObject->setPrototype(args.at(0));
+    if (args.at(1).isUndefined())
+        return newObject;
+    if (!args.at(1).isObject())
+        return throwError(exec, TypeError, "Property descriptor list must be an Object.");
+    return defineProperties(exec, newObject, asObject(args.at(1)));
+}
+
 } // namespace JSC