Source/WebCore/bindings/js/CallbackFunction.h

/*
 * Copyright (C) 2011 Apple 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:
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 CallbackFunction_h
#define CallbackFunction_h

#include <runtime/JSObject.h>

namespace JSC {
class ExecState;
}

namespace WebCore {

class JSDOMGlobalObject;

enum CallbackAllowedValueFlag {
    CallbackAllowUndefined = 1,
    CallbackAllowNull = 1 << 1
};

typedef unsigned CallbackAllowedValueFlags;

bool checkFunctionOnlyCallback(JSC::ExecState*, JSC::JSValue, CallbackAllowedValueFlags);

// Creates callback objects for callbacks marked as FunctionOnly in WebIDL.
template <typename JSCallbackType>
PassRefPtr<JSCallbackType> createFunctionOnlyCallback(JSC::ExecState* exec, JSDOMGlobalObject* globalObject, JSC::JSValue value, CallbackAllowedValueFlags acceptedValues = 0)
{
    if (checkFunctionOnlyCallback(exec, value, acceptedValues))
        return JSCallbackType::create(asObject(value), globalObject);
    return 0;
}

} // namespace WebCore

#endif // CallbackFunction_h