/*

 * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1.  Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer.

 * 2.  Redistributions in binary form must reproduce the above copyright

 *     notice, this list of conditions and the following disclaimer in the

 *     documentation and/or other materials provided with the distribution.

 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

 *     its contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY

 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#ifndef JSNotAnObject_h

#define JSNotAnObject_h

#include "JSObject.h"

namespace JSC {

    class JSNotAnObjectErrorStub : public JSObject {

    public:

        JSNotAnObjectErrorStub(ExecState* exec, bool isNull)

            : JSObject(exec->globalData().notAnObjectErrorStubStructure)

            , m_isNull(isNull)

        {

        }

        bool isNull() const { return m_isNull; }

    private:

        virtual bool isNotAnObjectErrorStub() const { return true; }

        bool m_isNull;

    };

    // This unholy class is used to allow us to avoid multiple exception checks

    // in certain SquirrelFish bytecodes -- effectively it just silently consumes

    // any operations performed on the result of a failed toObject call.

    class JSNotAnObject : public JSObject {

    public:

        JSNotAnObject(ExecState* exec, JSNotAnObjectErrorStub* exception)

            : JSObject(exec->globalData().notAnObjectStructure)

            , m_exception(exception)

        {

        }

        static PassRefPtr<Structure> createStructure(JSValue prototype)

        {

            return Structure::create(prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount);

        }

     private:

        static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesMarkChildren | OverridesGetPropertyNames | JSObject::StructureFlags;

        // JSValue methods

        virtual JSValue toPrimitive(ExecState*, PreferredPrimitiveType) const;

        virtual bool getPrimitiveNumber(ExecState*, double& number, JSValue&);

        virtual bool toBoolean(ExecState*) const;

        virtual double toNumber(ExecState*) const;

        virtual UString toString(ExecState*) const;

        virtual JSObject* toObject(ExecState*) const;

        // Marking

        virtual void markChildren(MarkStack&);

        // JSObject methods

        virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);

        virtual bool getOwnPropertySlot(ExecState*, unsigned propertyName, PropertySlot&);

        virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&);

        virtual void put(ExecState*, const Identifier& propertyName, JSValue, PutPropertySlot&);

        virtual void put(ExecState*, unsigned propertyName, JSValue);

        virtual bool deleteProperty(ExecState*, const Identifier& propertyName);

        virtual bool deleteProperty(ExecState*, unsigned propertyName);

        virtual void getOwnPropertyNames(ExecState*, PropertyNameArray&, EnumerationMode mode = ExcludeDontEnumProperties);

        JSNotAnObjectErrorStub* m_exception;

    };

} // namespace JSC

#endif // JSNotAnObject_h