Source/WebCore/dom/CurrentScriptIncrementer.h

/*
 * Copyright (C) 2013 Samsung Electronics. 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.
 * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS 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.
 */

#pragma once

#include "Document.h"
#include "HTMLScriptElement.h"

namespace WebCore {

class CurrentScriptIncrementer {
    WTF_MAKE_NONCOPYABLE(CurrentScriptIncrementer);
public:
    CurrentScriptIncrementer(Document& document, Element& element)
        : m_document(document)
        , m_isHTMLScriptElement(is<HTMLScriptElement>(element))
    {
        if (!m_isHTMLScriptElement)
            return;
        auto& scriptElement = downcast<HTMLScriptElement>(element);
        bool shouldPushNullForCurrentScript = scriptElement.isInShadowTree() || scriptElement.scriptType() == ScriptElement::ScriptType::Module;
        m_document.pushCurrentScript(shouldPushNullForCurrentScript ? nullptr : &scriptElement);
    }

    ~CurrentScriptIncrementer()
    {
        if (!m_isHTMLScriptElement)
            return;
        m_document.popCurrentScript();
    }

private:
    Document& m_document;
    bool m_isHTMLScriptElement;
};

} // namespace WebCore