/*

 * Copyright (c) 2008, 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 ScriptState_h

#define ScriptState_h

#include "JSDOMBinding.h"

#include <runtime/Protect.h>

#include <wtf/Noncopyable.h>

namespace WebCore {

class DOMWrapperWorld;

class Frame;

class Node;

class Page;

// The idea is to expose "state-like" methods (hadException, and any other

// methods where ExecState just dips into globalData) of JSC::ExecState as a

// separate abstraction.

// For now, the separation is purely by convention.

typedef JSC::ExecState ScriptState;

class ScriptStateProtectedPtr : public Noncopyable {

public:

    ScriptStateProtectedPtr() { }

    ScriptStateProtectedPtr(ScriptState* scriptState) : m_globalObject(scriptState->lexicalGlobalObject()) { }

    ScriptState* get()

    {

        if (m_globalObject)

            return m_globalObject->globalExec();

        return 0;

    }

private:

    JSC::ProtectedPtr<JSC::JSGlobalObject> m_globalObject;

};

ScriptState* mainWorldScriptState(Frame*);

ScriptState* scriptStateFromNode(DOMWrapperWorld*, Node*);

ScriptState* scriptStateFromPage(DOMWrapperWorld*, Page*);

} // namespace WebCore

#endif // ScriptState_h