/*

 * 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.

 * 3.  Neither the name of Apple Computer, 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.

 */

#include "config.h"

#include "HTMLTableRowsCollection.h"

#include "HTMLNames.h"

#include "HTMLTableElement.h"

#include "HTMLTableRowElement.h"

namespace WebCore {

using namespace HTMLNames;

static bool isInHead(Element* row)

{

    return row->parent() && static_cast<Element*>(row->parent())->hasLocalName(theadTag);

}

static bool isInBody(Element* row)

{

    return row->parent() && static_cast<Element*>(row->parent())->hasLocalName(tbodyTag);

}

static bool isInFoot(Element* row)

{

    return row->parent() && static_cast<Element*>(row->parent())->hasLocalName(tfootTag);

}

HTMLTableRowElement* HTMLTableRowsCollection::rowAfter(HTMLTableElement* table, HTMLTableRowElement* previous)

{

    Node* child = 0;

    // Start by looking for the next row in this section.

    // Continue only if there is none.

    if (previous && previous->parent() != table) {

        for (child = previous->nextSibling(); child; child = child->nextSibling()) {

            if (child->hasTagName(trTag))

                return static_cast<HTMLTableRowElement*>(child);

        }

    }

    // If still looking at head sections, find the first row in the next head section.

    if (!previous)

        child = table->firstChild();

    else if (isInHead(previous))

        child = previous->parent()->nextSibling();

    for (; child; child = child->nextSibling()) {

        if (child->hasTagName(theadTag)) {

            for (Node* grandchild = child->firstChild(); grandchild; grandchild = grandchild->nextSibling()) {

                if (grandchild->hasTagName(trTag))

                    return static_cast<HTMLTableRowElement*>(grandchild);

            }

        }

    }

    // If still looking at top level and bodies, find the next row in top level or the first in the next body section.

    if (!previous || isInHead(previous))

        child = table->firstChild();

    else if (previous->parent() == table)

        child = previous->nextSibling();

    else if (isInBody(previous))

        child = previous->parent()->nextSibling();

    for (; child; child = child->nextSibling()) {

        if (child->hasTagName(trTag))

            return static_cast<HTMLTableRowElement*>(child);

        if (child->hasTagName(tbodyTag)) {

            for (Node* grandchild = child->firstChild(); grandchild; grandchild = grandchild->nextSibling()) {

                if (grandchild->hasTagName(trTag))

                    return static_cast<HTMLTableRowElement*>(grandchild);

            }

        }

    }

    // Find the first row in the next foot section.

    if (!previous || !isInFoot(previous))

        child = table->firstChild();

    else

        child = previous->parent()->nextSibling();

    for (; child; child = child->nextSibling()) {

        if (child->hasTagName(tfootTag)) {

            for (Node* grandchild = child->firstChild(); grandchild; grandchild = grandchild->nextSibling()) {

                if (grandchild->hasTagName(trTag))

                    return static_cast<HTMLTableRowElement*>(grandchild);

            }

        }

    }

    return 0;

}

HTMLTableRowElement* HTMLTableRowsCollection::lastRow(HTMLTableElement* table)

{

    for (Node* child = table->lastChild(); child; child = child->previousSibling()) {

        if (child->hasTagName(tfootTag)) {

            for (Node* grandchild = child->lastChild(); grandchild; grandchild = grandchild->previousSibling()) {

                if (grandchild->hasTagName(trTag))

                    return static_cast<HTMLTableRowElement*>(grandchild);

            }

        }

    }

    for (Node* child = table->lastChild(); child; child = child->previousSibling()) {

        if (child->hasTagName(trTag))

            return static_cast<HTMLTableRowElement*>(child);

        if (child->hasTagName(tbodyTag)) {

            for (Node* grandchild = child->lastChild(); grandchild; grandchild = grandchild->previousSibling()) {

                if (grandchild->hasTagName(trTag))

                    return static_cast<HTMLTableRowElement*>(grandchild);

            }

        }

    }

    for (Node* child = table->lastChild(); child; child = child->previousSibling()) {

        if (child->hasTagName(theadTag)) {

            for (Node* grandchild = child->lastChild(); grandchild; grandchild = grandchild->previousSibling()) {

                if (grandchild->hasTagName(trTag))

                    return static_cast<HTMLTableRowElement*>(grandchild);

            }

        }

    }

    return 0;

}

HTMLTableRowsCollection::HTMLTableRowsCollection(PassRefPtr<HTMLTableElement> table)

    : HTMLCollection(table, OtherCollection, 0)

{

}

PassRefPtr<HTMLTableRowsCollection> HTMLTableRowsCollection::create(PassRefPtr<HTMLTableElement> table)

{

    return adoptRef(new HTMLTableRowsCollection(table));

}

Element* HTMLTableRowsCollection::itemAfter(Element* previous) const

{

    ASSERT(!previous || previous->hasLocalName(trTag));

    return rowAfter(static_cast<HTMLTableElement*>(base()), static_cast<HTMLTableRowElement*>(previous));

}

}