/*

 * Copyright (C) 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.

 *     * Neither the name of Google Inc. 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 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

 * OWNER 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.

 */

#include "config.h"

#include "DOMUtilitiesPrivate.h"

#include "Element.h"

#include "HTMLInputElement.h"

#include "HTMLLinkElement.h"

#include "HTMLMetaElement.h"

#include "HTMLNames.h"

#include "HTMLOptionElement.h"

#include "Node.h"

#include "WebInputElement.h"

using namespace WebCore;

namespace {

template <class HTMLNodeType>

HTMLNodeType* toHTMLElement(Node* node, const QualifiedName& name)

{

    if (node->isHTMLElement()

        && static_cast<HTMLElement*>(node)->hasTagName(name)) {

        return static_cast<HTMLNodeType*>(node);

    }

    return 0;

}

} // namespace

namespace WebKit {

HTMLInputElement* toHTMLInputElement(Node* node)

{

    return toHTMLElement<HTMLInputElement>(node, HTMLNames::inputTag);

}

HTMLLinkElement* toHTMLLinkElement(Node* node)

{

    return toHTMLElement<HTMLLinkElement>(node, HTMLNames::linkTag);

}

HTMLMetaElement* toHTMLMetaElement(Node* node)

{

    return toHTMLElement<HTMLMetaElement>(node, HTMLNames::metaTag);

}

HTMLOptionElement* toHTMLOptionElement(Node* node)

{

    return toHTMLElement<HTMLOptionElement>(node, HTMLNames::optionTag);

}

String nameOfInputElement(HTMLInputElement* element)

{

    return WebInputElement(element).nameForAutofill();

}

bool elementHasLegalLinkAttribute(const Element* element,

                                  const QualifiedName& attrName)

{

    if (attrName == HTMLNames::srcAttr) {

        // Check src attribute.

        if (element->hasTagName(HTMLNames::imgTag)

            || element->hasTagName(HTMLNames::scriptTag)

            || element->hasTagName(HTMLNames::iframeTag)

            || element->hasTagName(HTMLNames::frameTag))

            return true;

        if (element->hasTagName(HTMLNames::inputTag)) {

            const HTMLInputElement* input =

            static_cast<const HTMLInputElement*>(element);

            if (input->inputType() == HTMLInputElement::IMAGE)

                return true;

        }

    } else if (attrName == HTMLNames::hrefAttr) {

        // Check href attribute.

        if (element->hasTagName(HTMLNames::linkTag)

            || element->hasTagName(HTMLNames::aTag)

            || element->hasTagName(HTMLNames::areaTag))

            return true;

    } else if (attrName == HTMLNames::actionAttr) {

        if (element->hasTagName(HTMLNames::formTag))

            return true;

    } else if (attrName == HTMLNames::backgroundAttr) {

        if (element->hasTagName(HTMLNames::bodyTag)

            || element->hasTagName(HTMLNames::tableTag)

            || element->hasTagName(HTMLNames::trTag)

            || element->hasTagName(HTMLNames::tdTag))

            return true;

    } else if (attrName == HTMLNames::citeAttr) {

        if (element->hasTagName(HTMLNames::blockquoteTag)

            || element->hasTagName(HTMLNames::qTag)

            || element->hasTagName(HTMLNames::delTag)

            || element->hasTagName(HTMLNames::insTag))

            return true;

    } else if (attrName == HTMLNames::classidAttr

               || attrName == HTMLNames::dataAttr) {

        if (element->hasTagName(HTMLNames::objectTag))

            return true;

    } else if (attrName == HTMLNames::codebaseAttr) {

        if (element->hasTagName(HTMLNames::objectTag)

            || element->hasTagName(HTMLNames::appletTag))

            return true;

    }

    return false;

}

} // namespace WebKit