1 /*

     2  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)

     3  *  Copyright (C) 2007, 2008 Apple Inc. All rights reserved.

     4  *

     5  *  This library is free software; you can redistribute it and/or

     6  *  modify it under the terms of the GNU Lesser General Public

     7  *  License as published by the Free Software Foundation; either

     8  *  version 2 of the License, or (at your option) any later version.

     9  *

    10  *  This library is distributed in the hope that it will be useful,

    11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of

    12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    13  *  Lesser General Public License for more details.

    14  *

    15  *  You should have received a copy of the GNU Lesser General Public

    16  *  License along with this library; if not, write to the Free Software

    17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

    18  *

    19  */

    20 

    21 #ifndef StringObjectThatMasqueradesAsUndefined_h

    22 #define StringObjectThatMasqueradesAsUndefined_h

    23 

    24 #include "JSGlobalObject.h"

    25 #include "StringObject.h"

    26 #include "UString.h"

    27 

    28 namespace JSC {

    29 

    30     // WebCore uses this to make style.filter undetectable

    31     class StringObjectThatMasqueradesAsUndefined : public StringObject {

    32     public:

    33         static StringObjectThatMasqueradesAsUndefined* create(ExecState* exec, const UString& string)

    34         {

    35             return new (exec) StringObjectThatMasqueradesAsUndefined(exec,

    36                 createStructure(exec->lexicalGlobalObject()->stringPrototype()), string);

    37         }

    38 

    39     private:

    40         StringObjectThatMasqueradesAsUndefined(ExecState* exec, NonNullPassRefPtr<Structure> structure, const UString& string)

    41             : StringObject(exec, structure, string)

    42         {

    43         }

    44 

    45         static PassRefPtr<Structure> createStructure(JSValue proto) 

    46         { 

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

    48         }

    49 

    50         static const unsigned StructureFlags = OverridesGetOwnPropertySlot | MasqueradesAsUndefined | OverridesGetPropertyNames | StringObject::StructureFlags;

    51 

    52         virtual bool toBoolean(ExecState*) const { return false; }

    53     };

    54  

    55 } // namespace JSC

    56 

    57 #endif // StringObjectThatMasqueradesAsUndefined_h