1/*
2 * Copyright (C) 2008, 2009 Google 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 are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef ScriptValue_h
32#define ScriptValue_h
33
34#include "bindings/v8/SharedPersistent.h"
35#include "wtf/PassRefPtr.h"
36#include "wtf/RefPtr.h"
37#include "wtf/text/WTFString.h"
38#include <v8.h>
39
40namespace WebCore {
41
42class JSONValue;
43class ScriptState;
44
45class ScriptValue {
46public:
47    ScriptValue()
48        : m_isolate(0)
49    { }
50
51    virtual ~ScriptValue();
52
53    ScriptValue(v8::Handle<v8::Value> value, v8::Isolate* isolate)
54        : m_isolate(isolate)
55        , m_value(value.IsEmpty() ? 0 : SharedPersistent<v8::Value>::create(value, isolate))
56    {
57    }
58
59    ScriptValue(const ScriptValue& value)
60        : m_isolate(value.m_isolate)
61        , m_value(value.m_value)
62    {
63    }
64
65    v8::Isolate* isolate() const
66    {
67        if (!m_isolate)
68            m_isolate = v8::Isolate::GetCurrent();
69        return m_isolate;
70    }
71
72    static ScriptValue createUndefined(v8::Isolate* isolate)
73    {
74        return ScriptValue(v8::Undefined(isolate), isolate);
75    }
76
77    static ScriptValue createNull()
78    {
79        v8::Isolate* isolate = v8::Isolate::GetCurrent();
80        return ScriptValue(v8::Null(isolate), isolate);
81    }
82    static ScriptValue createBoolean(bool b)
83    {
84        v8::Isolate* isolate = v8::Isolate::GetCurrent();
85        return ScriptValue(b ? v8::True(isolate) : v8::False(isolate), isolate);
86    }
87
88    ScriptValue& operator=(const ScriptValue& value)
89    {
90        if (this != &value) {
91            m_value = value.m_value;
92            m_isolate = value.m_isolate;
93        }
94        return *this;
95    }
96
97    bool operator==(const ScriptValue& value) const
98    {
99        if (hasNoValue())
100            return value.hasNoValue();
101        if (value.hasNoValue())
102            return false;
103        return *m_value == *value.m_value;
104    }
105
106    bool isEqual(ScriptState*, const ScriptValue& value) const
107    {
108        return operator==(value);
109    }
110
111    // Note: This creates a new local Handle; not to be used in cases where is
112    // is an efficiency problem.
113    bool isFunction() const
114    {
115        ASSERT(!hasNoValue());
116        v8::Handle<v8::Value> value = v8Value();
117        return !value.IsEmpty() && value->IsFunction();
118    }
119
120    bool operator!=(const ScriptValue& value) const
121    {
122        return !operator==(value);
123    }
124
125    // Note: This creates a new local Handle; not to be used in cases where is
126    // is an efficiency problem.
127    bool isNull() const
128    {
129        ASSERT(!hasNoValue());
130        v8::Handle<v8::Value> value = v8Value();
131        return !value.IsEmpty() && value->IsNull();
132    }
133
134    // Note: This creates a new local Handle; not to be used in cases where is
135    // is an efficiency problem.
136    bool isUndefined() const
137    {
138        ASSERT(!hasNoValue());
139        v8::Handle<v8::Value> value = v8Value();
140        return !value.IsEmpty() && value->IsUndefined();
141    }
142
143    // Note: This creates a new local Handle; not to be used in cases where is
144    // is an efficiency problem.
145    bool isObject() const
146    {
147        ASSERT(!hasNoValue());
148        v8::Handle<v8::Value> value = v8Value();
149        return !value.IsEmpty() && value->IsObject();
150    }
151
152    bool hasNoValue() const
153    {
154        return !m_value.get() || m_value->isEmpty();
155    }
156
157    void clear()
158    {
159        m_value = 0;
160    }
161
162    v8::Handle<v8::Value> v8Value() const
163    {
164        return m_value.get() ? m_value->newLocal(m_isolate) : v8::Handle<v8::Value>();
165    }
166
167    bool getString(String& result) const;
168    String toString() const;
169
170    PassRefPtr<JSONValue> toJSONValue(ScriptState*) const;
171
172private:
173    mutable v8::Isolate* m_isolate;
174    RefPtr<SharedPersistent<v8::Value> > m_value;
175};
176
177} // namespace WebCore
178
179#endif // ScriptValue_h
180