Source/WebCore/bindings/js/JSDOMOperation.h

/*
 *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
 *  Copyright (C) 2003-2006, 2008-2009, 2013, 2016 Apple Inc. All rights reserved.
 *  Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
 *  Copyright (C) 2009 Google, Inc. All rights reserved.
 *  Copyright (C) 2012 Ericsson AB. All rights reserved.
 *  Copyright (C) 2013 Michael Pruett <michael@68k.org>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#pragma once

#include "JSDOMCastedThisErrorBehavior.h"
#include "JSDOMExceptionHandling.h"

namespace WebCore {

template<typename JSClass>
class IDLOperation {
public:
    using ClassParameter = JSClass*;
    using Operation = JSC::EncodedJSValue(JSC::ExecState*, ClassParameter, JSC::ThrowScope&);
    using StaticOperation = JSC::EncodedJSValue(JSC::ExecState*, JSC::ThrowScope&);

    static JSClass* cast(JSC::ExecState&);

    template<Operation operation, CastedThisErrorBehavior shouldThrow = CastedThisErrorBehavior::Throw>
    static JSC::EncodedJSValue call(JSC::ExecState& state, const char* operationName)
    {
        auto throwScope = DECLARE_THROW_SCOPE(state.vm());
        
        auto* thisObject = cast(state);
        if (shouldThrow != CastedThisErrorBehavior::Assert && UNLIKELY(!thisObject))
            return throwThisTypeError(state, throwScope, JSClass::info()->className, operationName);
        
        ASSERT(thisObject);
        ASSERT_GC_OBJECT_INHERITS(thisObject, JSClass::info());
        
        // FIXME: We should refactor the binding generated code to use references for state and thisObject.
        return operation(&state, thisObject, throwScope);
    }

    template<StaticOperation operation, CastedThisErrorBehavior shouldThrow = CastedThisErrorBehavior::Throw>
    static JSC::EncodedJSValue callStatic(JSC::ExecState& state, const char*)
    {
        auto throwScope = DECLARE_THROW_SCOPE(state.vm());

        // FIXME: We should refactor the binding generated code to use references for state.
        return operation(&state, throwScope);
    }
};

} // namespace WebCore