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/*
* Copyright (C) 2009 Apple Inc. All rights reserved.
* 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. AND ITS CONTRIBUTORS ``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 ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR 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/StylePrimitiveNumericTypes.h>
#include <wtf/Hasher.h>
namespace WebCore {
namespace Style {
// <-webkit-line-clamp> = none | <percentage [0,inf]> | <integer [1,inf]>
// NOTE: CSS Overflow 4 re-defines `-webkit-line-clamp` as a shorthand of 'max-lines', 'block-ellipsis', and 'continue'.
// https://drafts.csswg.org/css-overflow-4/#webkit-line-clamp
struct WebkitLineClamp {
using Percentage = Style::Percentage<CSS::Nonnegative>;
using Integer = Style::Integer<CSS::Range{1, CSS::Range::infinity}>;
constexpr WebkitLineClamp(CSS::Keyword::None)
{
}
constexpr WebkitLineClamp(Percentage percentage)
: m_value(percentage)
{
}
constexpr WebkitLineClamp(Integer integer)
: m_value(integer)
{
}
constexpr bool isNone() const { return std::holds_alternative<CSS::Keyword::None>(m_value); }
constexpr bool isPercentage() const { return std::holds_alternative<Percentage>(m_value); }
constexpr bool isInteger() const { return std::holds_alternative<Integer>(m_value); }
constexpr std::optional<Percentage> tryPercentage() const { return isPercentage() ? std::make_optional(std::get<Percentage>(m_value)) : std::nullopt; }
constexpr std::optional<Integer> tryInteger() const { return isInteger() ? std::make_optional(std::get<Integer>(m_value)) : std::nullopt; }
template<typename U> bool holdsAlternative() const
{
return std::holds_alternative<U>(m_value);
}
template<typename... F> decltype(auto) switchOn(F&&... f) const
{
return WTF::switchOn(m_value, std::forward<F>(f)...);
}
unsigned valueForHash() const
{
return WTF::switchOn(m_value,
[&](const CSS::Keyword::None&) { return computeHash(m_value.index()); },
[&](const auto& numeric) { return computeHash(m_value.index(), numeric.value); }
);
}
constexpr bool operator==(const WebkitLineClamp&) const = default;
private:
Variant<CSS::Keyword::None, Percentage, Integer> m_value;
};
// MARK: - Conversion
template<> struct CSSValueConversion<WebkitLineClamp> { auto operator()(BuilderState&, const CSSValue&) -> WebkitLineClamp; };
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::WebkitLineClamp)
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