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/*
* Copyright (C) 2024 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/ImmutableStyleProperties.h>
#include <WebCore/ScopedName.h>
#include <WebCore/StylePositionTryFallbackTactic.h>
#include <WebCore/StyleValueTypes.h>
#include <optional>
#include <wtf/RefPtr.h>
#include <wtf/Vector.h>
namespace WebCore {
namespace Style {
// <position-try-fallback> = [ [<dashed-ident> || <try-tactic>] | <position-area> ]
// https://drafts.csswg.org/css-anchor-position-1/#propdef-position-try-fallbacks
struct PositionTryFallback {
WTF_MAKE_STRUCT_TZONE_ALLOCATED(PositionTryFallback);
using Tactic = PositionTryFallbackTactic;
struct RuleAndTactics {
Markable<ScopedName> rule { };
ListOrNullopt<SpaceSeparatedVector<Tactic>> tactics { };
bool operator==(const RuleAndTactics&) const = default;
};
struct PositionArea {
RefPtr<const ImmutableStyleProperties> properties { };
bool operator==(const PositionArea&) const;
};
// Only one of these is valid at a time.
// FIXME: Use a Variant<PositionTryFallback::RuleAndTactics, PositionTryFallback::PositionArea> to enforce this invariant, and then make PositionArea use a Ref instead of a RefPtr.
RuleAndTactics ruleAndTactics { };
PositionArea positionArea { };
bool isPositionArea() const { return !!positionArea.properties; }
bool isRuleAndTactics() const { return !positionArea.properties; }
template<typename... F> decltype(auto) switchOn(F&&... f) const
{
auto visitor = WTF::makeVisitor(std::forward<F>(f)...);
if (isPositionArea())
return visitor(positionArea);
return visitor(ruleAndTactics);
}
bool operator==(const PositionTryFallback&) const;
};
template<size_t I> const auto& get(const PositionTryFallback::RuleAndTactics& value)
{
if constexpr (!I)
return value.rule;
else if constexpr (I == 1)
return value.tactics;
}
// MARK: - Conversion
template<> struct CSSValueConversion<PositionTryFallback> { auto operator()(BuilderState&, const CSSValue&) -> PositionTryFallback; };
// `PositionTryFallback::PositionArea` is special-cased to handle `ImmutableStyleProperties`.
template<> struct CSSValueCreation<PositionTryFallback::PositionArea> { auto operator()(CSSValuePool&, const RenderStyle&, const PositionTryFallback::PositionArea&) -> Ref<CSSValue>; };
// MARK: - Serialization
// `PositionTryFallback::PositionArea` is special-cased to handle `ImmutableStyleProperties`.
template<> struct Serialize<PositionTryFallback::PositionArea> { void operator()(StringBuilder&, const CSS::SerializationContext&, const RenderStyle&, const PositionTryFallback::PositionArea&); };
// MARK: - Logging
// `PositionTryFallback::PositionArea` is special-cased to handle `ImmutableStyleProperties`.
TextStream& operator<<(TextStream&, const PositionTryFallback::PositionArea&);
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::PositionTryFallback)
DEFINE_SPACE_SEPARATED_TUPLE_LIKE_CONFORMANCE(WebCore::Style::PositionTryFallback::RuleAndTactics, 2)
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