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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 "bindings/core/v8/ScriptState.h"
     35 #include "bindings/core/v8/SharedPersistent.h"
     36 #include "wtf/PassRefPtr.h"
     37 #include "wtf/RefPtr.h"
     38 #include "wtf/text/WTFString.h"
     39 #include <v8.h>
     40 
     41 namespace blink {
     42 
     43 class JSONValue;
     44 
     45 class ScriptValue FINAL {
     46 public:
     47     ScriptValue() { }
     48 
     49     ScriptValue(ScriptState* scriptState, v8::Handle<v8::Value> value)
     50         : m_scriptState(scriptState)
     51         , m_value(value.IsEmpty() ? nullptr : SharedPersistent<v8::Value>::create(value, scriptState->isolate()))
     52     {
     53         ASSERT(isEmpty() || m_scriptState);
     54     }
     55 
     56     ScriptValue(const ScriptValue& value)
     57         : m_scriptState(value.m_scriptState)
     58         , m_value(value.m_value)
     59     {
     60         ASSERT(isEmpty() || m_scriptState);
     61     }
     62 
     63     ScriptState* scriptState() const
     64     {
     65         return m_scriptState.get();
     66     }
     67 
     68     v8::Isolate* isolate() const
     69     {
     70         return m_scriptState ? m_scriptState->isolate() : v8::Isolate::GetCurrent();
     71     }
     72 
     73     ScriptValue& operator=(const ScriptValue& value)
     74     {
     75         if (this != &value) {
     76             m_scriptState = value.m_scriptState;
     77             m_value = value.m_value;
     78         }
     79         return *this;
     80     }
     81 
     82     bool operator==(const ScriptValue& value) const
     83     {
     84         if (isEmpty())
     85             return value.isEmpty();
     86         if (value.isEmpty())
     87             return false;
     88         return *m_value == *value.m_value;
     89     }
     90 
     91     bool operator!=(const ScriptValue& value) const
     92     {
     93         return !operator==(value);
     94     }
     95 
     96     // This creates a new local Handle; Don't use this in performance-sensitive places.
     97     bool isFunction() const
     98     {
     99         ASSERT(!isEmpty());
    100         v8::Handle<v8::Value> value = v8Value();
    101         return !value.IsEmpty() && value->IsFunction();
    102     }
    103 
    104     // This creates a new local Handle; Don't use this in performance-sensitive places.
    105     bool isNull() const
    106     {
    107         ASSERT(!isEmpty());
    108         v8::Handle<v8::Value> value = v8Value();
    109         return !value.IsEmpty() && value->IsNull();
    110     }
    111 
    112     // This creates a new local Handle; Don't use this in performance-sensitive places.
    113     bool isUndefined() const
    114     {
    115         ASSERT(!isEmpty());
    116         v8::Handle<v8::Value> value = v8Value();
    117         return !value.IsEmpty() && value->IsUndefined();
    118     }
    119 
    120     // This creates a new local Handle; Don't use this in performance-sensitive places.
    121     bool isObject() const
    122     {
    123         ASSERT(!isEmpty());
    124         v8::Handle<v8::Value> value = v8Value();
    125         return !value.IsEmpty() && value->IsObject();
    126     }
    127 
    128     bool isEmpty() const
    129     {
    130         return !m_value.get() || m_value->isEmpty();
    131     }
    132 
    133     void clear()
    134     {
    135         m_value = nullptr;
    136     }
    137 
    138     v8::Handle<v8::Value> v8Value() const;
    139     v8::Handle<v8::Value> v8ValueUnsafe() const;
    140 
    141     bool toString(String&) const;
    142     PassRefPtr<JSONValue> toJSONValue(ScriptState*) const;
    143 
    144 private:
    145     RefPtr<ScriptState> m_scriptState;
    146     RefPtr<SharedPersistent<v8::Value> > m_value;
    147 };
    148 
    149 } // namespace blink
    150 
    151 #endif // ScriptValue_h
    152