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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/StyleLengthWrapper.h>
#include <WebCore/StyleValueTypes.h>
namespace WebCore {
struct TabSize;
namespace Style {
// <'tab-size'> = <number [0,∞]> | <length [0,∞]>
// https://drafts.csswg.org/css-text-3/#propdef-tab-size
struct TabSize {
using Spaces = Style::Number<CSS::Nonnegative, float>;
using Length = Style::Length<CSS::Nonnegative, float>;
constexpr TabSize(CSS::ValueLiteral<CSS::NumberUnit::Number> literal)
: m_value { Spaces { literal } }
{
}
constexpr TabSize(CSS::ValueLiteral<CSS::LengthUnit::Px> literal)
: m_value { Length { literal } }
{
}
constexpr TabSize(Spaces spaces)
: m_value { spaces }
{
}
constexpr TabSize(Length length)
: m_value { length }
{
}
constexpr bool isSpaces() const { return holdsAlternative<Spaces>(); }
constexpr bool isLength() const { return holdsAlternative<Length>(); }
constexpr std::optional<Spaces> trySpaces() const { return isSpaces() ? std::make_optional(std::get<Spaces>(m_value)) : std::nullopt; }
constexpr std::optional<Length> tryLength() const { return isLength() ? std::make_optional(std::get<Length>(m_value)) : std::nullopt; }
constexpr bool isZero() const { return WTF::switchOn(m_value, [](auto value) { return value.isZero(); }); }
template<typename U> constexpr bool holdsAlternative() const
{
return WTF::holdsAlternative<U>(m_value);
}
template<typename... F> constexpr decltype(auto) switchOn(F&&... f) const
{
return WTF::switchOn(m_value, std::forward<F>(f)...);
}
constexpr bool operator==(const TabSize&) const = default;
constexpr bool hasSameType(const TabSize& other) const { return m_value.index() == other.m_value.index(); }
private:
friend struct Blending<TabSize>;
Variant<Spaces, Length> m_value;
};
// MARK: - Conversion
template<> struct CSSValueConversion<TabSize> { auto operator()(BuilderState&, const CSSValue&) -> TabSize; };
// MARK: - Blending
template<> struct Blending<TabSize> {
auto canBlend(const TabSize&, const TabSize&) -> bool;
auto blend(const TabSize&, const TabSize&, const BlendingContext&) -> TabSize;
};
// MARK: - Platform
template<> struct ToPlatform<TabSize> { auto operator()(const TabSize&) -> WebCore::TabSize; };
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::TabSize);
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