Source/bindings/v8/V8Callback.h

/*
* Copyright (C) 2012 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.
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* 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
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/

#ifndef V8Callback_h
#define V8Callback_h

#include "bindings/v8/V8Binding.h"
#include "bindings/v8/V8Utilities.h"
#include "core/dom/ExceptionCode.h"
#include <v8.h>

namespace WebCore {

class ScriptExecutionContext;

bool invokeCallback(v8::Handle<v8::Object> callback, int argc, v8::Handle<v8::Value> argv[], bool& callbackReturnValue, ScriptExecutionContext*, v8::Isolate*);
bool invokeCallback(v8::Handle<v8::Object> callback, v8::Handle<v8::Object> thisObject, int argc, v8::Handle<v8::Value> argv[], bool& callbackReturnValue, ScriptExecutionContext*, v8::Isolate*);

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

typedef unsigned CallbackAllowedValueFlags;

// 'FunctionOnly' is assumed for the created callback.
template <typename V8CallbackType>
PassRefPtr<V8CallbackType> createFunctionOnlyCallback(v8::Local<v8::Value> value, bool& succeeded, v8::Isolate* isolate, CallbackAllowedValueFlags acceptedValues = 0)
{
    succeeded = true;

    if (value->IsUndefined() && (acceptedValues & CallbackAllowUndefined))
        return 0;

    if (value->IsNull() && (acceptedValues & CallbackAllowNull))
        return 0;

    if (!value->IsFunction()) {
        succeeded = false;
        setDOMException(TypeMismatchError, isolate);
        return 0;
    }

    return V8CallbackType::create(value, getScriptExecutionContext());
}

} // namespace WebCore

#endif // V8Callback_h