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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:
PropertyDescriptor()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;
attributes()45         unsigned attributes() const { return m_attributes; }
value()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);
setValue(JSValue value)55         void setValue(JSValue value) { m_value = value; }
56         void setSetter(JSValue);
57         void setGetter(JSValue);
isEmpty()58         bool isEmpty() const { return !(m_value || m_getter || m_setter || m_seenAttributes); }
writablePresent()59         bool writablePresent() const { return m_seenAttributes & WritablePresent; }
enumerablePresent()60         bool enumerablePresent() const { return m_seenAttributes & EnumerablePresent; }
configurablePresent()61         bool configurablePresent() const { return m_seenAttributes & ConfigurablePresent; }
setterPresent()62         bool setterPresent() const { return m_setter; }
getterPresent()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
81