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 "JSCJSValue.h"
30
31namespace JSC {
32
33class GetterSetter;
34
35// See ES5.1 9.12
36bool sameValue(ExecState*, JSValue, JSValue);
37
38class PropertyDescriptor {
39public:
40 PropertyDescriptor()
41 : m_attributes(defaultAttributes)
42 , m_seenAttributes(0)
43 {
44 }
45 PropertyDescriptor(JSValue value, unsigned attributes)
46 : m_value(value)
47 , m_attributes(attributes)
48 , m_seenAttributes(EnumerablePresent | ConfigurablePresent | WritablePresent)
49 {
50 ASSERT(m_value);
51 ASSERT(!m_value.isGetterSetter());
52 ASSERT(!m_value.isCustomGetterSetter());
53 }
54 JS_EXPORT_PRIVATE bool writable() const;
55 JS_EXPORT_PRIVATE bool enumerable() const;
56 JS_EXPORT_PRIVATE bool configurable() const;
57 JS_EXPORT_PRIVATE bool isDataDescriptor() const;
58 bool isGenericDescriptor() const;
59 JS_EXPORT_PRIVATE bool isAccessorDescriptor() const;
60 unsigned attributes() const { return m_attributes; }
61 JSValue value() const { return m_value; }
62 JS_EXPORT_PRIVATE JSValue getter() const;
63 JS_EXPORT_PRIVATE JSValue setter() const;
64 JSObject* getterObject() const;
65 JSObject* setterObject() const;
66 JS_EXPORT_PRIVATE void setUndefined();
67 JS_EXPORT_PRIVATE void setDescriptor(JSValue, unsigned attributes);
68 JS_EXPORT_PRIVATE void setCustomDescriptor(unsigned attributes);
69 JS_EXPORT_PRIVATE void setAccessorDescriptor(GetterSetter* accessor, unsigned attributes);
70 JS_EXPORT_PRIVATE void setWritable(bool);
71 JS_EXPORT_PRIVATE void setEnumerable(bool);
72 JS_EXPORT_PRIVATE void setConfigurable(bool);
73 void setValue(JSValue value) { m_value = value; }
74 JS_EXPORT_PRIVATE void setSetter(JSValue);
75 JS_EXPORT_PRIVATE void setGetter(JSValue);
76 bool isEmpty() const { return !(m_value || m_getter || m_setter || m_seenAttributes); }
77 bool writablePresent() const { return m_seenAttributes & WritablePresent; }
78 bool enumerablePresent() const { return m_seenAttributes & EnumerablePresent; }
79 bool configurablePresent() const { return m_seenAttributes & ConfigurablePresent; }
80 bool setterPresent() const { return !!m_setter; }
81 bool getterPresent() const { return !!m_getter; }
82 bool equalTo(ExecState*, const PropertyDescriptor& other) const;
83 bool attributesEqual(const PropertyDescriptor& other) const;
84 unsigned attributesOverridingCurrent(const PropertyDescriptor& current) const;
85
86private:
87 JS_EXPORTDATA static unsigned defaultAttributes;
88 bool operator==(const PropertyDescriptor&) { return false; }
89 enum { WritablePresent = 1, EnumerablePresent = 2, ConfigurablePresent = 4};
90 // May be a getter/setter
91 JSValue m_value;
92 JSValue m_getter;
93 JSValue m_setter;
94 unsigned m_attributes;
95 unsigned m_seenAttributes;
96};
97
98}
99
100#endif
101