/*

 * 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 "AccessibilityTableCell.h"

#include "AXObjectCache.h"

#include "HTMLNames.h"

#include "RenderObject.h"

#include "RenderTableCell.h"

using namespace std;

namespace WebCore {

using namespace HTMLNames;

AccessibilityTableCell::AccessibilityTableCell(RenderObject* renderer)

    : AccessibilityRenderObject(renderer)

{

}

AccessibilityTableCell::~AccessibilityTableCell()

{

}

PassRefPtr<AccessibilityTableCell> AccessibilityTableCell::create(RenderObject* renderer)

{

    return adoptRef(new AccessibilityTableCell(renderer));

}

bool AccessibilityTableCell::accessibilityIsIgnored() const

{

    AccessibilityObjectInclusion decision = accessibilityIsIgnoredBase();

    if (decision == IncludeObject)

        return false;

    if (decision == IgnoreObject)

        return true;

    if (!isTableCell())

        return AccessibilityRenderObject::accessibilityIsIgnored();

    return false;

}

AccessibilityObject* AccessibilityTableCell::parentTable() const

{

    if (!m_renderer || !m_renderer->isTableCell())

        return 0;

    // Do not use getOrCreate. parentTable() can be called while the render tree is being modified 

    // by javascript, and creating a table element may try to access the render tree while in a bad state.

    // By using only get() implies that the AXTable must be created before AXTableCells. This should

    // always be the case when AT clients access a table.

    // https://bugs.webkit.org/show_bug.cgi?id=42652    

    return axObjectCache()->get(toRenderTableCell(m_renderer)->table());

}

bool AccessibilityTableCell::isTableCell() const

{

    AccessibilityObject* table = parentTable();

    if (!table || !table->isDataTable())

        return false;

    return true;

}

AccessibilityRole AccessibilityTableCell::roleValue() const

{

    if (!isTableCell())

        return AccessibilityRenderObject::roleValue();

    return CellRole;

}

void AccessibilityTableCell::rowIndexRange(pair<int, int>& rowRange)

{

    if (!m_renderer || !m_renderer->isTableCell())

        return;

    RenderTableCell* renderCell = toRenderTableCell(m_renderer);

    rowRange.first = renderCell->row();

    rowRange.second = renderCell->rowSpan();

    // since our table might have multiple sections, we have to offset our row appropriately

    RenderTableSection* section = renderCell->section();

    RenderTable* table = renderCell->table();

    if (!table || !section)

        return;

    RenderTableSection* tableSection = table->header();

    if (!tableSection)

        tableSection = table->firstBody();

    unsigned rowOffset = 0;

    while (tableSection) {

        if (tableSection == section)

            break;

        rowOffset += tableSection->numRows();

        tableSection = table->sectionBelow(tableSection, true); 

    }

    rowRange.first += rowOffset;

}

void AccessibilityTableCell::columnIndexRange(pair<int, int>& columnRange)

{

    if (!m_renderer || !m_renderer->isTableCell())

        return;

    RenderTableCell* renderCell = toRenderTableCell(m_renderer);

    columnRange.first = renderCell->col();

    columnRange.second = renderCell->colSpan();    

}

AccessibilityObject* AccessibilityTableCell::titleUIElement() const

{

    // Try to find if the first cell in this row is a <th>. If it is,

    // then it can act as the title ui element. (This is only in the

    // case when the table is not appearing as an AXTable.)

    if (isTableCell() || !m_renderer || !m_renderer->isTableCell())

        return 0;

    // Table cells that are th cannot have title ui elements, since by definition

    // they are title ui elements

    Node* node = m_renderer->node();

    if (node && node->hasTagName(thTag))

        return 0;

    RenderTableCell* renderCell = toRenderTableCell(m_renderer);

    // If this cell is in the first column, there is no need to continue.

    int col = renderCell->col();

    if (!col)

        return 0;

    int row = renderCell->row();

    RenderTableSection* section = renderCell->section();

    if (!section)

        return 0;

    RenderTableCell* headerCell = section->cellAt(row, 0).cell;

    if (!headerCell || headerCell == renderCell)

        return 0;

    Node* cellElement = headerCell->node();

    if (!cellElement || !cellElement->hasTagName(thTag))

        return 0;

    return axObjectCache()->getOrCreate(headerCell);

}

} // namespace WebCore