JavaScriptCore/kjs/JSNotAnObject.h

/*
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 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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#ifndef JSNotAnObject_h
#define JSNotAnObject_h

#include "JSObject.h"

namespace KJS {

    // This unholy class is used to allow us to avoid multiple exception checks
    // in certain SquirrelFish opcodes -- effectively it just silently consumes
    // any operations performed on the result of a failed toObject call.
    class JSNotAnObject : public JSObject {
    public:
        JSNotAnObject(JSObject* exception)
            : m_exception(exception)
        {
        }

        // JSValue methods
        virtual JSValue* toPrimitive(ExecState*, JSType preferredType = UnspecifiedType) 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 mark();

        // JSObject methods
        virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
        virtual bool getOwnPropertySlot(ExecState*, unsigned propertyName, PropertySlot&);

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

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

        virtual JSValue* defaultValue(ExecState*, JSType hint) const;

        virtual JSObject* construct(ExecState*, const List&);
        virtual JSObject* construct(ExecState*, const List&, const Identifier& functionName, const UString& sourceURL, int lineNumber);

        virtual JSValue* callAsFunction(ExecState*, JSObject* thisObj, const List&);

        virtual void getPropertyNames(ExecState*, PropertyNameArray&);

    private:
        JSObject* m_exception;
    };

} // namespace KJS

#endif // JSNotAnObject_h