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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.
*/
#pragma once
#include <WebCore/StyleValueTypes.h>
namespace WebCore {
namespace Style {
// <legacy-position> = left | right | center
// https://drafts.csswg.org/css-align/#valdef-justify-items-legacy
using LegacyPosition = Variant<CSS::Keyword::Left, CSS::Keyword::Right, CSS::Keyword::Center>;
// Used by alignment types in bitfields.
enum class LegacyPositionKind : uint8_t {
None,
Left,
Right,
Center
};
constexpr LegacyPositionKind computeKind(std::optional<LegacyPosition> position)
{
if (!position)
return LegacyPositionKind::None;
return WTF::switchOn(*position,
[](CSS::Keyword::Left) { return LegacyPositionKind::Left; },
[](CSS::Keyword::Right) { return LegacyPositionKind::Right; },
[](CSS::Keyword::Center) { return LegacyPositionKind::Center; }
);
}
constexpr decltype(auto) visitLegacyPosition(auto&& primaryKeyword, LegacyPositionKind kind, auto&& visitor)
{
switch (kind) {
case LegacyPositionKind::None:
// `legacy` on its own computes to `normal`.
// https://drafts.csswg.org/css-align/#valdef-justify-items-legacy
return visitor(CSS::Keyword::Normal { });
case LegacyPositionKind::Left:
return visitor(SpaceSeparatedTuple { primaryKeyword, CSS::Keyword::Left { } });
case LegacyPositionKind::Right:
return visitor(SpaceSeparatedTuple { primaryKeyword, CSS::Keyword::Right { } });
case LegacyPositionKind::Center:
return visitor(SpaceSeparatedTuple { primaryKeyword, CSS::Keyword::Center { } });
}
RELEASE_ASSERT_NOT_REACHED();
}
} // namespace Style
} // namespace WebCore
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