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 30 namespace JSC { 31 class ExecState; 32 } 33 34 namespace WebCore { 35 36 class JSDOMGlobalObject; 37 38 enum CallbackAllowedValueFlag { 39 CallbackAllowUndefined = 1, 40 CallbackAllowNull = 1 << 1 41 }; 42 43 typedef unsigned CallbackAllowedValueFlags; 44 45 bool checkFunctionOnlyCallback(JSC::ExecState*, JSC::JSValue, CallbackAllowedValueFlags); 46 47 // Creates callback objects for callbacks marked as FunctionOnly in WebIDL. 48 template <typename JSCallbackType> 49 PassRefPtr<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