runtime/PropertyDescriptor.h

   1 /*
   2  * Copyright (C) 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  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef PropertyDescriptor_h
  27 #define PropertyDescriptor_h
  28
  29 #include "JSValue.h"
  30
  31 namespace JSC {
  32     class PropertyDescriptor {
  33     public:
  34         PropertyDescriptor()
  35             : m_attributes(defaultAttributes)
  36             , m_seenAttributes(0)
  37         {
  38         }
  39         bool writable() const;
  40         bool enumerable() const;
  41         bool configurable() const;
  42         bool isDataDescriptor() const;
  43         bool isGenericDescriptor() const;
  44         bool isAccessorDescriptor() const;
  45         unsigned attributes() const { return m_attributes; }
  46         JSValue value() const { return m_value; }
  47         JSValue getter() const;
  48         JSValue setter() const;
  49         void setUndefined();
  50         void setDescriptor(JSValue value, unsigned attributes);
  51         void setAccessorDescriptor(JSValue getter, JSValue setter, unsigned attributes);
  52         void setWritable(bool);
  53         void setEnumerable(bool);
  54         void setConfigurable(bool);
  55         void setValue(JSValue value) { m_value = value; }
  56         void setSetter(JSValue);
  57         void setGetter(JSValue);
  58         bool isEmpty() const { return !(m_value || m_getter || m_setter || m_seenAttributes); }
  59         bool writablePresent() const { return m_seenAttributes & WritablePresent; }
  60         bool enumerablePresent() const { return m_seenAttributes & EnumerablePresent; }
  61         bool configurablePresent() const { return m_seenAttributes & ConfigurablePresent; }
  62         bool setterPresent() const { return m_setter; }
  63         bool getterPresent() const { return m_getter; }
  64         bool equalTo(ExecState* exec, const PropertyDescriptor& other) const;
  65         bool attributesEqual(const PropertyDescriptor& other) const;
  66         unsigned attributesWithOverride(const PropertyDescriptor& other) const;
  67     private:
  68         static unsigned defaultAttributes;
  69         bool operator==(const PropertyDescriptor&){ return false; }
  70         enum { WritablePresent = 1, EnumerablePresent = 2, ConfigurablePresent = 4};
  71         // May be a getter/setter
  72         JSValue m_value;
  73         JSValue m_getter;
  74         JSValue m_setter;
  75         unsigned m_attributes;
  76         unsigned m_seenAttributes;
  77     };
  78 }
  79
  80 #endif