/*

 * 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 <v8.h>

namespace WebCore {

    class EventListener;

    class Frame;

    class KURL;

    class ScriptExecutionContext;

    class ScriptState;

    class String;

    // 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);

    void navigateIfAllowed(Frame*, const KURL&, bool lockHistory, bool lockBackForwardList);

    ScriptExecutionContext* 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