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/*
* Copyright (C) 2025 Samuel Weinig <sam@webkit.org>
*
* 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. ``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
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* 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 "CSSGridNamedAreaMap.h"
#include "CSSSerializationContext.h"
#include <wtf/text/StringBuilder.h>
#include <wtf/text/TextStream.h>
namespace WebCore {
namespace CSS {
bool addRow(GridNamedAreaMap& gridAreaMap, const GridNamedAreaMapRow& row)
{
if (!gridAreaMap.rowCount) {
gridAreaMap.columnCount = row.size();
if (!gridAreaMap.columnCount)
return false;
} else if (gridAreaMap.columnCount != row.size()) {
// The declaration is invalid if all the rows don't have the number of columns.
return false;
}
for (size_t currentColumn = 0; currentColumn < gridAreaMap.columnCount; ++currentColumn) {
auto& gridAreaName = row[currentColumn];
// Unnamed areas are always valid (we consider them to be 1x1).
if (gridAreaName == "."_s)
continue;
auto lookAheadColumn = currentColumn + 1;
while (lookAheadColumn < gridAreaMap.columnCount && row[lookAheadColumn] == gridAreaName)
lookAheadColumn++;
auto result = gridAreaMap.map.ensure(gridAreaName, [&] {
return GridArea {
GridSpan::translatedDefiniteGridSpan(gridAreaMap.rowCount, gridAreaMap.rowCount + 1),
GridSpan::translatedDefiniteGridSpan(currentColumn, lookAheadColumn)
};
});
if (!result.isNewEntry) {
auto& gridArea = result.iterator->value;
// The following checks test that the grid area is a single filled-in rectangle.
// 1. The new row is adjacent to the previously parsed row.
if (gridAreaMap.rowCount != gridArea.rows.endLine())
return false;
// 2. The new area starts at the same position as the previously parsed area.
if (currentColumn != gridArea.columns.startLine())
return false;
// 3. The new area ends at the same position as the previously parsed area.
if (lookAheadColumn != gridArea.columns.endLine())
return false;
gridArea.rows = GridSpan::translatedDefiniteGridSpan(gridArea.rows.startLine(), gridArea.rows.endLine() + 1);
}
currentColumn = lookAheadColumn - 1;
}
++gridAreaMap.rowCount;
return true;
}
// MARK: - Serialization
static void serializeGridNamedAreaMapPosition(StringBuilder& builder, const GridNamedAreaMap::Map& map, size_t row, size_t column)
{
HashSet<String> candidates;
for (auto& [name, area] : map) {
if (row >= area.rows.startLine() && row < area.rows.endLine())
candidates.add(name);
}
for (auto& [name, area] : map) {
if (column >= area.columns.startLine() && column < area.columns.endLine() && candidates.contains(name)) {
builder.append(name);
return;
}
}
builder.append('.');
}
void Serialize<GridNamedAreaMap>::operator()(StringBuilder& builder, const CSS::SerializationContext&, const GridNamedAreaMap& value)
{
for (size_t row = 0; row < value.rowCount; ++row) {
builder.append('"');
for (size_t column = 0; column < value.columnCount; ++column) {
serializeGridNamedAreaMapPosition(builder, value.map, row, column);
if (column != value.columnCount - 1)
builder.append(' ');
}
builder.append('"');
if (row != value.rowCount - 1)
builder.append(' ');
}
}
// MARK: - Logging
TextStream& operator<<(TextStream& ts, const GridNamedAreaMap& value)
{
return ts << serializationForCSS(defaultSerializationContext(), value);
}
} // namespace CSS
} // namespace WebCore
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