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/*
* Copyright (C) 2006, 2007, 2008, 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef V8Utilities_h
#define V8Utilities_h
#include <wtf/Forward.h>
#include <v8.h>
namespace WebCore {
class EventListener;
class Frame;
class KURL;
class ScriptExecutionContext;
class ScriptState;
// Use an array to hold dependents. It works like a ref-counted scheme. A value can be added more than once to the DOM object.
void createHiddenDependency(v8::Handle<v8::Object>, v8::Local<v8::Value>, int cacheIndex);
void removeHiddenDependency(v8::Handle<v8::Object>, v8::Local<v8::Value>, int cacheIndex);
// Combo create/remove, for generated event-handler-setter bindings:
void transferHiddenDependency(v8::Handle<v8::Object>, EventListener* oldValue, v8::Local<v8::Value> newValue, int cacheIndex);
bool processingUserGesture();
bool shouldAllowNavigation(Frame*);
KURL completeURL(const String& relativeURL);
ScriptExecutionContext* getScriptExecutionContext();
void throwTypeMismatchException();
enum CallbackAllowedValueFlag {
CallbackAllowUndefined = 1,
CallbackAllowNull = 1 << 1
};
typedef unsigned CallbackAllowedValueFlags;
// 'FunctionOnly' is assumed for the created callback.
template <typename V8CallbackType>
PassRefPtr<V8CallbackType> createFunctionOnlyCallback(v8::Local<v8::Value> value, bool& succeeded, CallbackAllowedValueFlags acceptedValues = 0)
{
succeeded = true;
if (value->IsUndefined() && (acceptedValues & CallbackAllowUndefined))
return 0;
if (value->IsNull() && (acceptedValues & CallbackAllowNull))
return 0;
if (!value->IsFunction()) {
succeeded = false;
throwTypeMismatchException();
return 0;
}
return V8CallbackType::create(value, getScriptExecutionContext());
}
class AllowAllocation {
public:
inline AllowAllocation()
{
m_previous = m_current;
m_current = true;
}
inline ~AllowAllocation()
{
m_current = m_previous;
}
static bool m_current;
private:
bool m_previous;
};
class SafeAllocation {
public:
static inline v8::Local<v8::Object> newInstance(v8::Handle<v8::Function>);
static inline v8::Local<v8::Object> newInstance(v8::Handle<v8::ObjectTemplate>);
static inline v8::Local<v8::Object> newInstance(v8::Handle<v8::Function>, int argc, v8::Handle<v8::Value> argv[]);
};
v8::Local<v8::Object> SafeAllocation::newInstance(v8::Handle<v8::Function> function)
{
if (function.IsEmpty())
return v8::Local<v8::Object>();
AllowAllocation allow;
return function->NewInstance();
}
v8::Local<v8::Object> SafeAllocation::newInstance(v8::Handle<v8::ObjectTemplate> objectTemplate)
{
if (objectTemplate.IsEmpty())
return v8::Local<v8::Object>();
AllowAllocation allow;
return objectTemplate->NewInstance();
}
v8::Local<v8::Object> SafeAllocation::newInstance(v8::Handle<v8::Function> function, int argc, v8::Handle<v8::Value> argv[])
{
if (function.IsEmpty())
return v8::Local<v8::Object>();
AllowAllocation allow;
return function->NewInstance(argc, argv);
}
} // namespace WebCore
#endif // V8Utilities_h
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