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 * Copyright (C) 2006, 2007, 2008, 2009 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
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 */

#ifndef V8Utilities_h
#define V8Utilities_h

#include "wtf/Forward.h"
#include <v8.h>

namespace WTF {
class ArrayBuffer;
}

namespace WebCore {

    class EventListener;
    class MessagePort;
    class ExecutionContext;

    // Use an array to hold dependents. It works like a ref-counted scheme. A value can be added more than once to the DOM object.
    void createHiddenDependency(v8::Handle<v8::Object>, v8::Local<v8::Value>, int cacheIndex, v8::Isolate*);
    void removeHiddenDependency(v8::Handle<v8::Object>, v8::Local<v8::Value>, int cacheIndex, v8::Isolate*);

    // Combo create/remove, for generated event-handler-setter bindings:
    void transferHiddenDependency(v8::Handle<v8::Object>, EventListener* oldValue, v8::Local<v8::Value> newValue, int cacheIndex, v8::Isolate*);

    ExecutionContext* getExecutionContext();

    typedef WTF::Vector<RefPtr<MessagePort>, 1> MessagePortArray;
    typedef WTF::Vector<RefPtr<ArrayBuffer>, 1> ArrayBufferArray;

    // Helper function which pulls the values out of a JS sequence and into a MessagePortArray.
    // Also validates the elements per sections 4.1.13 and 4.1.15 of the WebIDL spec and section 8.3.3
    // of the HTML5 spec and generates exceptions as appropriate.
    // Returns true if the array was filled, or false if the passed value was not of an appropriate type.
    bool extractTransferables(v8::Local<v8::Value>, MessagePortArray&, ArrayBufferArray&, v8::Isolate*);
    bool getMessagePortArray(v8::Local<v8::Value>, MessagePortArray&, v8::Isolate*);

} // namespace WebCore

#endif // V8Utilities_h