Source/WebCore/layout/formattingContexts/table/TableFormattingState.cpp

/*
 * Copyright (C) 2019 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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 "TableFormattingState.h"

#if ENABLE(LAYOUT_FORMATTING_CONTEXT)

#include "TableFormattingContext.h"
#include <wtf/IsoMallocInlines.h>

namespace WebCore {
namespace Layout {

WTF_MAKE_ISO_ALLOCATED_IMPL(TableFormattingState);

static UniqueRef<TableGrid> ensureTableGrid(const ContainerBox& tableBox)
{
    auto tableGrid = makeUniqueRef<TableGrid>();
    auto& tableStyle = tableBox.style();
    auto shouldApplyBorderSpacing = tableStyle.borderCollapse() == BorderCollapse::Separate;
    tableGrid->setHorizontalSpacing(LayoutUnit { shouldApplyBorderSpacing ? tableStyle.horizontalBorderSpacing() : 0 });
    tableGrid->setVerticalSpacing(LayoutUnit { shouldApplyBorderSpacing ? tableStyle.verticalBorderSpacing() : 0 });

    auto* firstChild = tableBox.firstChild();
    if (!firstChild) {
        // The rare case of empty table.
        return tableGrid;
    }

    const Box* tableCaption = nullptr;
    const Box* colgroup = nullptr;
    // Table caption is an optional element; if used, it is always the first child of a <table>.
    if (firstChild->isTableCaption())
        tableCaption = firstChild;
    // The <colgroup> must appear after any optional <caption> element but before any <thead>, <th>, <tbody>, <tfoot> and <tr> element.
    auto* colgroupCandidate = firstChild;
    if (tableCaption)
        colgroupCandidate = tableCaption->nextSibling();
    if (colgroupCandidate->isTableColumnGroup())
        colgroup = colgroupCandidate;

    if (colgroup) {
        auto& columns = tableGrid->columns();
        for (auto* column = downcast<ContainerBox>(*colgroup).firstChild(); column; column = column->nextSibling()) {
            ASSERT(column->isTableColumn());
            auto columnSpanCount = column->columnSpan();
            ASSERT(columnSpanCount > 0);
            while (columnSpanCount--)
                columns.addColumn(downcast<ContainerBox>(*column));
        }
    }

    auto* firstSection = colgroup ? colgroup->nextSibling() : tableCaption ? tableCaption->nextSibling() : firstChild;
    for (auto* section = firstSection; section; section = section->nextSibling()) {
        ASSERT(section->isTableHeader() || section->isTableBody() || section->isTableFooter());
        for (auto* row = downcast<ContainerBox>(*section).firstChild(); row; row = row->nextSibling()) {
            ASSERT(row->isTableRow());
            for (auto* cell = downcast<ContainerBox>(*row).firstChild(); cell; cell = cell->nextSibling()) {
                ASSERT(cell->isTableCell());
                tableGrid->appendCell(downcast<ContainerBox>(*cell));
            }
        }
    }
    return tableGrid;
}


TableFormattingState::TableFormattingState(Ref<FloatingState>&& floatingState, LayoutState& layoutState, const ContainerBox& tableBox)
    : FormattingState(WTFMove(floatingState), Type::Table, layoutState)
    , m_tableGrid(ensureTableGrid(tableBox))
{
}

TableFormattingState::~TableFormattingState()
{
}

}
}
#endif