1/*
2 * Copyright (C) 2011 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1.  Redistributions of source code must retain the above copyright
8 *     notice, this list of conditions and the following disclaimer.
9 * 2.  Redistributions in binary form must reproduce the above copyright
10 *     notice, this list of conditions and the following disclaimer in the
11 *     documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#ifndef CallbackFunction_h
26#define CallbackFunction_h
27
28#include <runtime/JSObject.h>
29
30namespace JSC {
31class ExecState;
32}
33
34namespace WebCore {
35
36class JSDOMGlobalObject;
37
38enum CallbackAllowedValueFlag {
39    CallbackAllowUndefined = 1,
40    CallbackAllowNull = 1 << 1
41};
42
43typedef unsigned CallbackAllowedValueFlags;
44
45bool checkFunctionOnlyCallback(JSC::ExecState*, JSC::JSValue, CallbackAllowedValueFlags);
46
47// Creates callback objects for callbacks marked as FunctionOnly in WebIDL.
48template <typename JSCallbackType>
49PassRefPtr<JSCallbackType> createFunctionOnlyCallback(JSC::ExecState* exec, JSDOMGlobalObject* globalObject, JSC::JSValue value, CallbackAllowedValueFlags acceptedValues = 0)
50{
51    if (checkFunctionOnlyCallback(exec, value, acceptedValues))
52        return JSCallbackType::create(asObject(value), globalObject);
53    return 0;
54}
55
56} // namespace WebCore
57
58#endif // CallbackFunction_h
59