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/*
* Copyright (C) 2024-2025 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 "CSSPosition.h"
namespace WebCore {
namespace CSS {
bool isCenterPosition(const Position& position)
{
auto isCenter = [](const auto& component) {
return WTF::switchOn(component.offset,
[](auto) { return false; },
[](Keyword::Center) { return true; },
[](const LengthPercentage<>& value) {
return WTF::switchOn(value,
[](const LengthPercentage<>::Raw& raw) { return raw == 50_css_percentage; },
[](const LengthPercentage<>::Calc&) { return false; }
);
}
);
};
return WTF::switchOn(position,
[&](const TwoComponentPositionHorizontalVertical& components) {
return isCenter(get<0>(components)) && isCenter(get<1>(components));
},
[&](const auto&) {
return false;
}
);
}
static auto toTwoComponent(const ThreeComponentPositionHorizontal& component) -> TwoComponentPositionHorizontal
{
return WTF::switchOn(component.offset, [](auto keyword) -> TwoComponentPositionHorizontal { return { keyword }; });
}
static auto toTwoComponent(const ThreeComponentPositionVertical& component) -> TwoComponentPositionVertical
{
return WTF::switchOn(component.offset, [](auto keyword) -> TwoComponentPositionVertical { return { keyword }; });
}
std::pair<CSS::PositionX, CSS::PositionY> split(CSS::Position&& position)
{
// CSS::PositionX and CSS::PositionY don't utilize the three component variants, so the
// non-length containing item must be converted to its two component variant.
return WTF::switchOn(WTFMove(position),
[&](const auto& components) -> std::pair<CSS::PositionX, CSS::PositionY> {
return { CSS::PositionX(get<0>(components)), CSS::PositionY(get<1>(components)) };
},
[&](const ThreeComponentPositionHorizontalVerticalLengthFirst& components) -> std::pair<CSS::PositionX, CSS::PositionY> {
return { CSS::PositionX(get<0>(components)), CSS::PositionY(toTwoComponent(get<1>(components))) };
},
[&](const ThreeComponentPositionHorizontalVerticalLengthSecond& components) -> std::pair<CSS::PositionX, CSS::PositionY> {
return { CSS::PositionX(toTwoComponent(get<0>(components))), CSS::PositionY(get<1>(components)) };
}
);
}
} // namespace CSS
} // namespace WebCore
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