/*
 * Copyright (C) 1997 Martin Jones (mjones@kde.org)
 *           (C) 1997 Torben Weis (weis@kde.org)
 *           (C) 1998 Waldo Bastian (bastian@kde.org)
 *           (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 * Copyright (C) 2003, 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "config.h"
#include "core/html/HTMLTableCellElement.h"

#include "core/CSSPropertyNames.h"
#include "core/CSSValueKeywords.h"
#include "core/HTMLNames.h"
#include "core/dom/Attribute.h"
#include "core/dom/ElementTraversal.h"
#include "core/html/HTMLTableElement.h"
#include "core/html/parser/HTMLParserIdioms.h"
#include "core/layout/LayoutTableCell.h"

using namespace std;
using namespace std;

namespace blink {

// Clamp rowspan and colspan at 8k.
// Firefox used a limit of 8190 for rowspan but they changed it to 65,534.
// (FIXME: We should consider increasing this limit (crbug.com/78577).
// Firefox uses a limit of 1,000 for colspan and resets the value to 1
// but we don't discriminate between rowspan / colspan as it is artificial.
static const unsigned maxColRowSpan = 8190;

using namespace HTMLNames;

inline HTMLTableCellElement::HTMLTableCellElement(const QualifiedName& tagName, Document& document)
    : HTMLTablePartElement(tagName, document)
{
}

DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(HTMLTableCellElement)

unsigned HTMLTableCellElement::colSpan() const
{
    const AtomicString& colSpanValue = fastGetAttribute(colspanAttr);
    unsigned value = 0;
    if (colSpanValue.isEmpty() || !parseHTMLNonNegativeInteger(colSpanValue, value))
        return 1;
    return max(1u, min(value, maxColRowSpan));
}

unsigned HTMLTableCellElement::rowSpan() const
{
    const AtomicString& rowSpanValue = fastGetAttribute(rowspanAttr);
    unsigned value = 0;
    if (rowSpanValue.isEmpty() || !parseHTMLNonNegativeInteger(rowSpanValue, value))
        return 1;
    return max(1u, min(value, maxColRowSpan));
}

int HTMLTableCellElement::cellIndex() const
{
    if (!isHTMLTableRowElement(parentElement()))
        return -1;

    int index = 0;
    for (const HTMLTableCellElement* element = Traversal<HTMLTableCellElement>::previousSibling(*this); element; element = Traversal<HTMLTableCellElement>::previousSibling(*element))
        ++index;

    return index;
}

bool HTMLTableCellElement::isPresentationAttribute(const QualifiedName& name) const
{
    if (name == nowrapAttr || name == widthAttr || name == heightAttr)
        return true;
    return HTMLTablePartElement::isPresentationAttribute(name);
}

void HTMLTableCellElement::collectStyleForPresentationAttribute(const QualifiedName& name, const AtomicString& value, MutableStylePropertySet* style)
{
    if (name == nowrapAttr) {
        addPropertyToPresentationAttributeStyle(style, CSSPropertyWhiteSpace, CSSValueWebkitNowrap);
    } else if (name == widthAttr) {
        if (!value.isEmpty()) {
            int widthInt = value.toInt();
            if (widthInt > 0) // width="0" is ignored for compatibility with WinIE.
                addHTMLLengthToStyle(style, CSSPropertyWidth, value);
        }
    } else if (name == heightAttr) {
        if (!value.isEmpty()) {
            int heightInt = value.toInt();
            if (heightInt > 0) // height="0" is ignored for compatibility with WinIE.
                addHTMLLengthToStyle(style, CSSPropertyHeight, value);
        }
    } else {
        HTMLTablePartElement::collectStyleForPresentationAttribute(name, value, style);
    }
}

void HTMLTableCellElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
{
    if (name == rowspanAttr) {
        if (layoutObject() && layoutObject()->isTableCell())
            toLayoutTableCell(layoutObject())->colSpanOrRowSpanChanged();
    } else if (name == colspanAttr) {
        if (layoutObject() && layoutObject()->isTableCell())
            toLayoutTableCell(layoutObject())->colSpanOrRowSpanChanged();
    } else {
        HTMLTablePartElement::parseAttribute(name, value);
    }
}

const StylePropertySet* HTMLTableCellElement::additionalPresentationAttributeStyle()
{
    if (HTMLTableElement* table = findParentTable())
        return table->additionalCellStyle();
    return nullptr;
}

bool HTMLTableCellElement::isURLAttribute(const Attribute& attribute) const
{
    return attribute.name() == backgroundAttr || HTMLTablePartElement::isURLAttribute(attribute);
}

bool HTMLTableCellElement::hasLegalLinkAttribute(const QualifiedName& name) const
{
    return (hasTagName(tdTag) && name == backgroundAttr) || HTMLTablePartElement::hasLegalLinkAttribute(name);
}

const QualifiedName& HTMLTableCellElement::subResourceAttributeName() const
{
    return hasTagName(tdTag) ? backgroundAttr : HTMLTablePartElement::subResourceAttributeName();
}

const AtomicString& HTMLTableCellElement::abbr() const
{
    return fastGetAttribute(abbrAttr);
}

const AtomicString& HTMLTableCellElement::axis() const
{
    return fastGetAttribute(axisAttr);
}

void HTMLTableCellElement::setColSpan(unsigned n)
{
    setUnsignedIntegralAttribute(colspanAttr, n);
}

const AtomicString& HTMLTableCellElement::headers() const
{
    return fastGetAttribute(headersAttr);
}

void HTMLTableCellElement::setRowSpan(unsigned n)
{
    setUnsignedIntegralAttribute(rowspanAttr, n);
}

const AtomicString& HTMLTableCellElement::scope() const
{
    return fastGetAttribute(scopeAttr);
}

HTMLTableCellElement* HTMLTableCellElement::cellAbove() const
{
    LayoutObject* cellLayoutObject = layoutObject();
    if (!cellLayoutObject)
        return nullptr;
    if (!cellLayoutObject->isTableCell())
        return nullptr;

    LayoutTableCell* tableCellLayoutObject = toLayoutTableCell(cellLayoutObject);
    LayoutTableCell* cellAboveLayoutObject = tableCellLayoutObject->table()->cellAbove(tableCellLayoutObject);
    if (!cellAboveLayoutObject)
        return nullptr;

    return toHTMLTableCellElement(cellAboveLayoutObject->node());
}

} // namespace blink