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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 "StyleLengthWrapper.h"
namespace WebCore {
namespace Style {
struct VerticalAlignLength : LengthWrapperBase<LengthPercentage<>> {
using Base::Base;
};
// <'vertical-align'> = baseline | sub | super | top | text-top | middle | bottom | text-bottom | -webkit-baseline-middle | <length-percentage>
// https://www.w3.org/TR/CSS22/visudet.html#propdef-vertical-align
// FIXME: We implement the version of `vertical-align` from CSS 2. In CSS Inline 3, it has been changed to a shorthand property with grammar `[ first | last] || <'alignment-baseline'> || <'baseline-shift'>`.
// https://drafts.csswg.org/css-inline/#propdef-vertical-align
struct VerticalAlign {
using Length = VerticalAlignLength;
VerticalAlign(CSS::Keyword::Baseline keyword) : m_value { keyword } { }
VerticalAlign(CSS::Keyword::Sub keyword) : m_value { keyword } { }
VerticalAlign(CSS::Keyword::Super keyword) : m_value { keyword } { }
VerticalAlign(CSS::Keyword::Top keyword) : m_value { keyword } { }
VerticalAlign(CSS::Keyword::TextTop keyword) : m_value { keyword } { }
VerticalAlign(CSS::Keyword::Middle keyword) : m_value { keyword } { }
VerticalAlign(CSS::Keyword::Bottom keyword) : m_value { keyword } { }
VerticalAlign(CSS::Keyword::TextBottom keyword) : m_value { keyword } { }
VerticalAlign(CSS::Keyword::WebkitBaselineMiddle keyword) : m_value { keyword } { }
VerticalAlign(Length&& length) : m_value { WTFMove(length) } { }
bool isBaseline() const { return WTF::holdsAlternative<CSS::Keyword::Baseline>(m_value); }
bool isSub() const { return WTF::holdsAlternative<CSS::Keyword::Sub>(m_value); }
bool isSuper() const { return WTF::holdsAlternative<CSS::Keyword::Super>(m_value); }
bool isTop() const { return WTF::holdsAlternative<CSS::Keyword::Top>(m_value); }
bool isTextTop() const { return WTF::holdsAlternative<CSS::Keyword::TextTop>(m_value); }
bool isMiddle() const { return WTF::holdsAlternative<CSS::Keyword::Middle>(m_value); }
bool isBottom() const { return WTF::holdsAlternative<CSS::Keyword::Bottom>(m_value); }
bool isTextBottom() const { return WTF::holdsAlternative<CSS::Keyword::TextBottom>(m_value); }
bool isWebkitBaselineMiddle() const { return WTF::holdsAlternative<CSS::Keyword::WebkitBaselineMiddle>(m_value); }
bool isLength() const { return WTF::holdsAlternative<Length>(m_value); }
std::optional<Length> tryLength() const { return isLength() ? std::make_optional(std::get<Length>(m_value)) : std::nullopt; }
template<typename U> bool holdsAlternative() const
{
return WTF::holdsAlternative<U>(m_value);
}
template<typename... F> decltype(auto) switchOn(F&&... f) const
{
return WTF::switchOn(m_value, std::forward<F>(f)...);
}
bool operator==(const VerticalAlign&) const = default;
private:
friend struct Blending<VerticalAlign>;
Variant<CSS::Keyword::Baseline, CSS::Keyword::Sub, CSS::Keyword::Super, CSS::Keyword::Top, CSS::Keyword::TextTop, CSS::Keyword::Middle, CSS::Keyword::Bottom, CSS::Keyword::TextBottom, CSS::Keyword::WebkitBaselineMiddle, VerticalAlignLength> m_value;
};
// MARK: - Conversion
template<> struct CSSValueConversion<VerticalAlign> { auto operator()(BuilderState&, const CSSValue&) -> VerticalAlign; };
// MARK: - Blending
template<> struct Blending<VerticalAlign> {
auto canBlend(const VerticalAlign&, const VerticalAlign&) -> bool;
auto requiresInterpolationForAccumulativeIteration(const VerticalAlign&, const VerticalAlign&) -> bool;
auto blend(const VerticalAlign&, const VerticalAlign&, const BlendingContext&) -> VerticalAlign;
};
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::VerticalAlignLength)
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::VerticalAlign)
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