runtime/JSPropertyNameIterator.h

   1 /*
   2  * Copyright (C) 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:
   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 JSPropertyNameIterator_h
  30 #define JSPropertyNameIterator_h
  31
  32 #include "JSObject.h"
  33 #include "JSString.h"
  34 #include "PropertyNameArray.h"
  35
  36 namespace JSC {
  37
  38     class Identifier;
  39     class JSObject;
  40
  41     class JSPropertyNameIterator : public JSCell {
  42     public:
  43         static JSPropertyNameIterator* create(ExecState*, JSValuePtr);
  44
  45         virtual ~JSPropertyNameIterator();
  46
  47         virtual JSValuePtr toPrimitive(ExecState*, PreferredPrimitiveType) const;
  48         virtual bool getPrimitiveNumber(ExecState*, double&, JSValuePtr&);
  49         virtual bool toBoolean(ExecState*) const;
  50         virtual double toNumber(ExecState*) const;
  51         virtual UString toString(ExecState*) const;
  52         virtual JSObject* toObject(ExecState*) const;
  53
  54         virtual void mark();
  55
  56         JSValuePtr next(ExecState*);
  57         void invalidate();
  58
  59     private:
  60         JSPropertyNameIterator();
  61         JSPropertyNameIterator(JSObject*, PassRefPtr<PropertyNameArrayData> propertyNameArrayData);
  62
  63         JSObject* m_object;
  64         RefPtr<PropertyNameArrayData> m_data;
  65         PropertyNameArrayData::const_iterator m_position;
  66         PropertyNameArrayData::const_iterator m_end;
  67     };
  68
  69 inline JSPropertyNameIterator::JSPropertyNameIterator()
  70     : JSCell(0)
  71     , m_object(0)
  72     , m_position(0)
  73     , m_end(0)
  74 {
  75 }
  76
  77 inline JSPropertyNameIterator::JSPropertyNameIterator(JSObject* object, PassRefPtr<PropertyNameArrayData> propertyNameArrayData)
  78     : JSCell(0)
  79     , m_object(object)
  80     , m_data(propertyNameArrayData)
  81     , m_position(m_data->begin())
  82     , m_end(m_data->end())
  83 {
  84 }
  85
  86 inline JSPropertyNameIterator* JSPropertyNameIterator::create(ExecState* exec, JSValuePtr v)
  87 {
  88     if (v.isUndefinedOrNull())
  89         return new (exec) JSPropertyNameIterator;
  90
  91     JSObject* o = v.toObject(exec);
  92     PropertyNameArray propertyNames(exec);
  93     o->getPropertyNames(exec, propertyNames);
  94     return new (exec) JSPropertyNameIterator(o, propertyNames.releaseData());
  95 }
  96
  97 inline JSValuePtr JSPropertyNameIterator::next(ExecState* exec)
  98 {
  99     if (m_position == m_end)
 100         return noValue();
 101
 102     if (m_data->cachedStructure() == m_object->structure() && m_data->cachedPrototypeChain() == m_object->structure()->prototypeChain(exec))
 103         return jsOwnedString(exec, (*m_position++).ustring());
 104
 105     do {
 106         if (m_object->hasProperty(exec, *m_position))
 107             return jsOwnedString(exec, (*m_position++).ustring());
 108         m_position++;
 109     } while (m_position != m_end);
 110
 111     return noValue();
 112 }
 113
 114 } // namespace JSC
 115
 116 #endif // JSPropertyNameIterator_h