1/*
2 * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef JSNotAnObject_h
30#define JSNotAnObject_h
31
32#include "JSObject.h"
33
34namespace JSC {
35
36    // This unholy class is used to allow us to avoid multiple exception checks
37    // in certain SquirrelFish bytecodes -- effectively it just silently consumes
38    // any operations performed on the result of a failed toObject call.
39    class JSNotAnObject : public JSNonFinalObject {
40    public:
41        JSNotAnObject(ExecState* exec)
42            : JSNonFinalObject(exec->globalData(), exec->globalData().notAnObjectStructure.get())
43        {
44        }
45
46        static Structure* createStructure(JSGlobalData& globalData, JSValue prototype)
47        {
48            return Structure::create(globalData, prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount, &s_info);
49        }
50
51     private:
52
53        static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesGetPropertyNames | JSObject::StructureFlags;
54
55        // JSValue methods
56        virtual JSValue toPrimitive(ExecState*, PreferredPrimitiveType) const;
57        virtual bool getPrimitiveNumber(ExecState*, double& number, JSValue&);
58        virtual bool toBoolean(ExecState*) const;
59        virtual double toNumber(ExecState*) const;
60        virtual UString toString(ExecState*) const;
61        virtual JSObject* toObject(ExecState*, JSGlobalObject*) const;
62
63        // JSObject methods
64        virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
65        virtual bool getOwnPropertySlot(ExecState*, unsigned propertyName, PropertySlot&);
66        virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&);
67
68        virtual void put(ExecState*, const Identifier& propertyName, JSValue, PutPropertySlot&);
69        virtual void put(ExecState*, unsigned propertyName, JSValue);
70
71        virtual bool deleteProperty(ExecState*, const Identifier& propertyName);
72        virtual bool deleteProperty(ExecState*, unsigned propertyName);
73
74        virtual void getOwnPropertyNames(ExecState*, PropertyNameArray&, EnumerationMode mode = ExcludeDontEnumProperties);
75    };
76
77} // namespace JSC
78
79#endif // JSNotAnObject_h
80