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      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 "PlatformString.h"
     35 #include "ScriptState.h"
     36 
     37 #include <v8.h>
     38 #include <wtf/PassRefPtr.h>
     39 
     40 #ifndef NDEBUG
     41 #include "V8Proxy.h"  // for register and unregister global handles.
     42 #endif
     43 
     44 namespace WebCore {
     45 
     46 class SerializedScriptValue;
     47 
     48 class ScriptValue {
     49 public:
     50     ScriptValue() {}
     51 
     52     ScriptValue(v8::Handle<v8::Value> value)
     53     {
     54         if (value.IsEmpty())
     55             return;
     56 
     57         m_value = v8::Persistent<v8::Value>::New(value);
     58 #ifndef NDEBUG
     59         V8GCController::registerGlobalHandle(SCRIPTVALUE, this, m_value);
     60 #endif
     61     }
     62 
     63     ScriptValue(const ScriptValue& value)
     64     {
     65         if (value.m_value.IsEmpty())
     66             return;
     67 
     68         m_value = v8::Persistent<v8::Value>::New(value.m_value);
     69 #ifndef NDEBUG
     70         V8GCController::registerGlobalHandle(SCRIPTVALUE, this, m_value);
     71 #endif
     72     }
     73 
     74     ScriptValue& operator=(const ScriptValue& value)
     75     {
     76         if (this == &value)
     77             return *this;
     78 
     79         clear();
     80 
     81         if (value.m_value.IsEmpty())
     82             return *this;
     83 
     84         m_value = v8::Persistent<v8::Value>::New(value.m_value);
     85 #ifndef NDEBUG
     86         V8GCController::registerGlobalHandle(SCRIPTVALUE, this, m_value);
     87 #endif
     88 
     89         return *this;
     90     }
     91 
     92     bool operator==(const ScriptValue value) const
     93     {
     94         return m_value == value.m_value;
     95     }
     96 
     97     bool isEqual(ScriptState*, const ScriptValue& value) const
     98     {
     99         return m_value == value.m_value;
    100     }
    101 
    102     bool operator!=(const ScriptValue value) const
    103     {
    104         return !operator==(value);
    105     }
    106 
    107     bool isNull() const
    108     {
    109         return m_value->IsNull();
    110     }
    111 
    112     bool isUndefined() const
    113     {
    114         return m_value->IsUndefined();
    115     }
    116 
    117     bool isObject() const
    118     {
    119         return m_value->IsObject();
    120     }
    121 
    122     bool hasNoValue() const
    123     {
    124         return m_value.IsEmpty();
    125     }
    126 
    127     PassRefPtr<SerializedScriptValue> serialize(ScriptState*);
    128     static ScriptValue deserialize(ScriptState*, SerializedScriptValue*);
    129 
    130     void clear()
    131     {
    132         if (m_value.IsEmpty())
    133             return;
    134 
    135 #ifndef NDEBUG
    136         V8GCController::unregisterGlobalHandle(this, m_value);
    137 #endif
    138         m_value.Dispose();
    139         m_value.Clear();
    140     }
    141 
    142     virtual ~ScriptValue()
    143     {
    144         clear();
    145     }
    146 
    147     v8::Handle<v8::Value> v8Value() const { return m_value; }
    148     bool getString(ScriptState*, String& result) const { return getString(result); }
    149     bool getString(String& result) const;
    150     String toString(ScriptState*) const;
    151 
    152 private:
    153     mutable v8::Persistent<v8::Value> m_value;
    154 };
    155 
    156 } // namespace WebCore
    157 
    158 #endif // ScriptValue_h
    159