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/*
* Copyright (C) 2024-2025 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 "CSSCalcTree.h"
#include <optional>
#include <wtf/HashFunctions.h>
#include <wtf/HashTraits.h>
#include <wtf/Hasher.h>
#include <wtf/text/AtomString.h>
namespace WebCore {
namespace CSSCalc {
struct RandomCachingKey {
using Identifier = Variant<
Random::SharingOptions::Auto,
AtomString,
WTF::HashTableDeletedValueType,
WTF::HashTableEmptyValueType
>;
Identifier identifier;
RandomCachingKey(Variant<Random::SharingOptions::Auto, AtomString>&& identifier)
: identifier { WTF::switchOn(WTFMove(identifier), [](auto&& alternative) { return Identifier { WTFMove(alternative) }; }) }
{
}
RandomCachingKey(const Variant<Random::SharingOptions::Auto, AtomString>& identifier)
: identifier { WTF::switchOn(identifier, [](const auto& alternative) { return Identifier { alternative }; }) }
{
}
explicit RandomCachingKey(WTF::HashTableDeletedValueType)
: identifier { WTF::HashTableDeletedValue }
{
}
explicit RandomCachingKey(WTF::HashTableEmptyValueType)
: identifier { WTF::HashTableEmptyValue }
{
}
bool isHashTableDeletedValue() const { return std::holds_alternative<WTF::HashTableDeletedValueType>(identifier); }
bool isHashTableEmptyValue() const { return std::holds_alternative<WTF::HashTableEmptyValueType>(identifier); }
bool operator==(const RandomCachingKey&) const = default;
};
} // namespace CSSCalc
} // namespace WebCore
namespace WTF {
struct CSSCalcRandomCachingKeyHash {
static unsigned hash(const WebCore::CSSCalc::RandomCachingKey& key)
{
Hasher hasher;
add(hasher, key.identifier.index());
WTF::switchOn(key.identifier,
[&](const WebCore::CSSCalc::Random::SharingOptions::Auto& autoValue) {
add(hasher, autoValue.property);
add(hasher, autoValue.index);
},
[&](const AtomString& string) {
add(hasher, string);
},
[](const WTF::HashTableDeletedValueType&) {
RELEASE_ASSERT_NOT_REACHED();
},
[](const WTF::HashTableEmptyValueType&) {
RELEASE_ASSERT_NOT_REACHED();
}
);
return hasher.hash();
}
static bool equal(const WebCore::CSSCalc::RandomCachingKey& a, const WebCore::CSSCalc::RandomCachingKey& b) { return a == b; }
static const bool safeToCompareToEmptyOrDeleted = true;
};
template<> struct HashTraits<WebCore::CSSCalc::RandomCachingKey> : GenericHashTraits<WebCore::CSSCalc::RandomCachingKey> {
static WebCore::CSSCalc::RandomCachingKey emptyValue() { return WebCore::CSSCalc::RandomCachingKey(HashTableEmptyValue); }
static bool isEmptyValue(const WebCore::CSSCalc::RandomCachingKey& value) { return value.isHashTableEmptyValue(); }
static void constructDeletedValue(WebCore::CSSCalc::RandomCachingKey& slot) { new (NotNull, &slot) WebCore::CSSCalc::RandomCachingKey(HashTableDeletedValue); }
static bool isDeletedValue(const WebCore::CSSCalc::RandomCachingKey& slot) { return slot.isHashTableDeletedValue(); }
static const bool hasIsEmptyValueFunction = true;
static const bool emptyValueIsZero = false;
};
template<> struct DefaultHash<WebCore::CSSCalc::RandomCachingKey> : CSSCalcRandomCachingKeyHash { };
} // namespace WTF
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