JavaScriptCore/runtime/JSVariableObject.cpp

   1 /*
   2  * Copyright (C) 2007, 2008 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:
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   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
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  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 #include "config.h"
  30 #include "JSVariableObject.h"
  31
  32 #include "PropertyNameArray.h"
  33 #include "PropertyDescriptor.h"
  34
  35 namespace JSC {
  36
  37 bool JSVariableObject::deleteProperty(ExecState* exec, const Identifier& propertyName)
  38 {
  39     if (symbolTable().contains(propertyName.ustring().rep()))
  40         return false;
  41
  42     return JSObject::deleteProperty(exec, propertyName);
  43 }
  44
  45 void JSVariableObject::getOwnPropertyNames(ExecState* exec, PropertyNameArray& propertyNames)
  46 {
  47     SymbolTable::const_iterator end = symbolTable().end();
  48     for (SymbolTable::const_iterator it = symbolTable().begin(); it != end; ++it) {
  49         if (!(it->second.getAttributes() & DontEnum))
  50             propertyNames.add(Identifier(exec, it->first.get()));
  51     }
  52
  53     JSObject::getOwnPropertyNames(exec, propertyNames);
  54 }
  55
  56 bool JSVariableObject::isVariableObject() const
  57 {
  58     return true;
  59 }
  60
  61 bool JSVariableObject::symbolTableGet(const Identifier& propertyName, PropertyDescriptor& descriptor)
  62 {
  63     SymbolTableEntry entry = symbolTable().inlineGet(propertyName.ustring().rep());
  64     if (!entry.isNull()) {
  65         descriptor.setDescriptor(registerAt(entry.getIndex()).jsValue(), entry.getAttributes() | DontDelete);
  66         return true;
  67     }
  68     return false;
  69 }
  70
  71 } // namespace JSC