WebCore/bindings/js/JSDOMGlobalObject.h

/*
 * Copyright (C) 2008 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
 * 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 JSDOMGlobalObject_h
#define JSDOMGlobalObject_h

#include <runtime/JSGlobalObject.h>

namespace WebCore {

    class Document;
    class Event;
    class JSLazyEventListener;
    class JSEventListener;
    class ScriptExecutionContext;

    typedef HashMap<const JSC::ClassInfo*, RefPtr<JSC::Structure> > JSDOMStructureMap;
    typedef HashMap<const JSC::ClassInfo*, JSC::JSObject*> JSDOMConstructorMap;

    class JSDOMGlobalObject : public JSC::JSGlobalObject {
        typedef JSC::JSGlobalObject Base;
    protected:
        struct JSDOMGlobalObjectData;

        JSDOMGlobalObject(NonNullPassRefPtr<JSC::Structure>, JSDOMGlobalObjectData*, JSC::JSObject* thisValue);

    public:
        JSDOMStructureMap& structures() { return d()->structures; }
        JSDOMConstructorMap& constructors() const { return d()->constructors; }

        virtual ScriptExecutionContext* scriptExecutionContext() const = 0;

        // Creates a JS EventListener for an "onXXX" event attribute. These
        // listeners cannot be removed through the removeEventListener API.
        PassRefPtr<JSEventListener> createJSAttributeEventListener(JSC::JSValue);

        // Make binding code generation easier.
        JSDOMGlobalObject* globalObject() { return this; }

        void setCurrentEvent(Event*);
        Event* currentEvent() const;

        virtual void markChildren(JSC::MarkStack&);

    protected:
        struct JSDOMGlobalObjectData : public JSC::JSGlobalObject::JSGlobalObjectData {
            JSDOMGlobalObjectData()
                : JSGlobalObjectData(destroyJSDOMGlobalObjectData)
                , evt(0)
            {
            }

            JSDOMGlobalObjectData(Destructor destructor)
                : JSGlobalObjectData(destructor)
                , evt(0)
            {
            }

            JSDOMStructureMap structures;
            JSDOMConstructorMap constructors;

            Event* evt;
        };

    private:
        static void destroyJSDOMGlobalObjectData(void*);

        JSDOMGlobalObjectData* d() const { return static_cast<JSDOMGlobalObjectData*>(JSC::JSVariableObject::d); }
    };

    template<class ConstructorClass>
    inline JSC::JSObject* getDOMConstructor(JSC::ExecState* exec, const JSDOMGlobalObject* globalObject)
    {
        if (JSC::JSObject* constructor = globalObject->constructors().get(&ConstructorClass::s_info))
            return constructor;
        JSC::JSObject* constructor = new (exec) ConstructorClass(exec, const_cast<JSDOMGlobalObject*>(globalObject));
        ASSERT(!globalObject->constructors().contains(&ConstructorClass::s_info));
        globalObject->constructors().set(&ConstructorClass::s_info, constructor);
        return constructor;
    }

    JSDOMGlobalObject* toJSDOMGlobalObject(Document*);
    JSDOMGlobalObject* toJSDOMGlobalObject(ScriptExecutionContext*);

} // namespace WebCore

#endif // JSDOMGlobalObject_h