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/*
* Copyright (C) 2024 Apple Inc. All rights reserved.
*
* 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 "CSSPropertyParserConsumer+RawTypes.h"
#include <optional>
#include <variant>
#include <wtf/Brigand.h>
#include <wtf/Forward.h>
#include <wtf/Ref.h>
#include <wtf/StdLibExtras.h>
namespace WebCore {
class CSSCalcSymbolTable;
class CSSCalcValue;
// Type-erased helpers to allow for shared code.
bool unevaluatedCalcEqual(const Ref<CSSCalcValue>&, const Ref<CSSCalcValue>&);
void unevaluatedCalcSerialization(StringBuilder&, const Ref<CSSCalcValue>&);
// `UnevaluatedCalc` annotates a `CSSCalcValue` with the raw value type that it
// will be evaluated to, allowing the processing of calc in generic code.
template<typename T> struct UnevaluatedCalc {
using RawType = T;
Ref<CSSCalcValue> calc;
bool operator==(const UnevaluatedCalc<T>& other) const
{
return unevaluatedCalcEqual(calc, other.calc);
}
};
// MARK: - Utility templates
template<typename T>
struct IsUnevaluatedCalc : public std::integral_constant<bool, WTF::IsTemplate<T, UnevaluatedCalc>::value> { };
template<typename TypeList>
struct TypesMinusUnevaluatedCalc {
using ResultTypeList = brigand::remove_if<TypeList, IsUnevaluatedCalc<brigand::_1>>;
using type = VariantOrSingle<ResultTypeList>;
};
template<typename... Ts>
using TypesMinusUnevaluatedCalcType = typename TypesMinusUnevaluatedCalc<brigand::list<Ts...>>::type;
template<typename>
struct TypePlusUnevaluatedCalc;
template<> struct TypePlusUnevaluatedCalc<AngleRaw> {
using type = brigand::list<AngleRaw, UnevaluatedCalc<AngleRaw>>;
};
template<> struct TypePlusUnevaluatedCalc<PercentRaw> {
using type = brigand::list<PercentRaw, UnevaluatedCalc<PercentRaw>>;
};
template<> struct TypePlusUnevaluatedCalc<NumberRaw> {
using type = brigand::list<NumberRaw, UnevaluatedCalc<NumberRaw>>;
};
template<> struct TypePlusUnevaluatedCalc<LengthRaw> {
using type = brigand::list<LengthRaw, UnevaluatedCalc<LengthRaw>>;
};
template<> struct TypePlusUnevaluatedCalc<ResolutionRaw> {
using type = brigand::list<ResolutionRaw, UnevaluatedCalc<ResolutionRaw>>;
};
template<> struct TypePlusUnevaluatedCalc<TimeRaw> {
using type = brigand::list<TimeRaw, UnevaluatedCalc<TimeRaw>>;
};
template<> struct TypePlusUnevaluatedCalc<NoneRaw> {
using type = brigand::list<NoneRaw>;
};
template<> struct TypePlusUnevaluatedCalc<SymbolRaw> {
using type = brigand::list<SymbolRaw>;
};
template<typename TypeList>
struct TypesPlusUnevaluatedCalc {
using ResultTypeList = brigand::flatten<brigand::transform<TypeList, TypePlusUnevaluatedCalc<brigand::_1>>>;
using type = VariantOrSingle<ResultTypeList>;
};
template<typename... Ts>
using TypesPlusUnevaluatedCalcType = typename TypesPlusUnevaluatedCalc<brigand::list<Ts...>>::type;
// MARK: - Serialization
template<typename T>
void serializationForCSS(StringBuilder& builder, const UnevaluatedCalc<T>& unevaluatedCalc)
{
unevaluatedCalcSerialization(builder, unevaluatedCalc.calc);
}
// MARK: - Evaluation
AngleRaw evaluateCalc(const UnevaluatedCalc<AngleRaw>&, const CSSCalcSymbolTable&);
NumberRaw evaluateCalc(const UnevaluatedCalc<NumberRaw>&, const CSSCalcSymbolTable&);
PercentRaw evaluateCalc(const UnevaluatedCalc<PercentRaw>&, const CSSCalcSymbolTable&);
LengthRaw evaluateCalc(const UnevaluatedCalc<LengthRaw>&, const CSSCalcSymbolTable&);
ResolutionRaw evaluateCalc(const UnevaluatedCalc<ResolutionRaw>&, const CSSCalcSymbolTable&);
TimeRaw evaluateCalc(const UnevaluatedCalc<TimeRaw>&, const CSSCalcSymbolTable&);
template<typename T>
auto evaluateCalc(const T& component, const CSSCalcSymbolTable&) -> T
{
return component;
}
template<typename... Ts>
auto evaluateCalc(const std::variant<Ts...>& component, const CSSCalcSymbolTable& symbolTable) -> TypesMinusUnevaluatedCalcType<Ts...>
{
return WTF::switchOn(component, [&](auto part) -> TypesMinusUnevaluatedCalcType<Ts...> {
return evaluateCalc(part, symbolTable);
});
}
template<typename... Ts>
auto evaluateCalc(const std::optional<std::variant<Ts...>>& component, const CSSCalcSymbolTable& symbolTable) -> std::optional<TypesMinusUnevaluatedCalcType<Ts...>>
{
if (component)
return evaluateCalc(*component, symbolTable);
return std::nullopt;
}
} // namespace WebCore
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