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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 {
// <overflow-position> = unsafe | safe
// https://drafts.csswg.org/css-align/#typedef-overflow-position
using OverflowPosition = Variant<CSS::Keyword::Unsafe, CSS::Keyword::Safe>;
// Used by alignment types in bitfields.
enum class OverflowPositionKind : uint8_t {
None,
Unsafe,
Safe
};
constexpr OverflowPositionKind computeKind(std::optional<OverflowPosition> overflow)
{
if (!overflow)
return OverflowPositionKind::None;
return WTF::switchOn(*overflow,
[](CSS::Keyword::Unsafe) { return OverflowPositionKind::Unsafe; },
[](CSS::Keyword::Safe) { return OverflowPositionKind::Safe; }
);
}
constexpr decltype(auto) visitOverflowPosition(auto&& primaryKeyword, OverflowPositionKind kind, auto&& visitor)
{
switch (kind) {
case OverflowPositionKind::None:
return visitor(primaryKeyword);
case OverflowPositionKind::Unsafe:
return visitor(SpaceSeparatedTuple { CSS::Keyword::Unsafe { }, primaryKeyword });
case OverflowPositionKind::Safe:
return visitor(SpaceSeparatedTuple { CSS::Keyword::Safe { }, primaryKeyword });
}
RELEASE_ASSERT_NOT_REACHED();
}
} // namespace Style
} // namespace WebCore
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