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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 "CSSPrimitiveNumericConcepts.h"
#include "CSSValueTypes.h"
#include <optional>
#include <variant>
#include <wtf/Forward.h>
#include <wtf/IterationStatus.h>
#include <wtf/Ref.h>
#include <wtf/StdLibExtras.h>
namespace WebCore {
class CSSCalcSymbolTable;
class CSSCalcValue;
class CSSToLengthConversionData;
struct ComputedStyleDependencies;
struct NoConversionDataRequiredToken;
namespace Calculation {
enum class Category : uint8_t;
}
namespace Style {
class BuilderState;
}
namespace CSS {
// Type-erased helpers to allow for shared code.
void unevaluatedCalcRef(CSSCalcValue*);
void unevaluatedCalcDeref(CSSCalcValue*);
// `UnevaluatedCalc` annotates a `CSSCalcValue` with the raw value type that it
// will be evaluated to, allowing the processing of calc in generic code.
// Non-generic base type to allow code sharing and out-of-line definitions.
struct UnevaluatedCalcBase {
UnevaluatedCalcBase(CSSCalcValue&);
UnevaluatedCalcBase(Ref<CSSCalcValue>&&);
UnevaluatedCalcBase(const UnevaluatedCalcBase&);
UnevaluatedCalcBase(UnevaluatedCalcBase&&);
UnevaluatedCalcBase& operator=(const UnevaluatedCalcBase&);
UnevaluatedCalcBase& operator=(UnevaluatedCalcBase&&);
~UnevaluatedCalcBase();
Ref<CSSCalcValue> protectedCalc() const;
CSSCalcValue& leakRef() WARN_UNUSED_RETURN;
bool requiresConversionData() const;
void serializationForCSS(StringBuilder&, const CSS::SerializationContext&) const;
void collectComputedStyleDependencies(ComputedStyleDependencies&) const;
IterationStatus visitChildren(NOESCAPE const Function<IterationStatus(CSSValue&)>&) const;
UnevaluatedCalcBase simplifyBase(const CSSToLengthConversionData&, const CSSCalcSymbolTable&) const;
double evaluate(Calculation::Category, const Style::BuilderState&) const;
double evaluate(Calculation::Category, const Style::BuilderState&, const CSSCalcSymbolTable&) const;
double evaluate(Calculation::Category, const CSSToLengthConversionData&) const;
double evaluate(Calculation::Category, const CSSToLengthConversionData&, const CSSCalcSymbolTable&) const;
double evaluate(Calculation::Category, NoConversionDataRequiredToken) const;
double evaluate(Calculation::Category, NoConversionDataRequiredToken, const CSSCalcSymbolTable&) const;
bool equal(const UnevaluatedCalcBase&) const;
private:
Ref<CSSCalcValue> calc;
};
template<NumericRaw RawType> struct UnevaluatedCalc : UnevaluatedCalcBase {
using UnevaluatedCalcBase::UnevaluatedCalcBase;
using UnevaluatedCalcBase::operator=;
using Raw = RawType;
using UnitType = typename Raw::UnitType;
using UnitTraits = typename Raw::UnitTraits;
using ResolvedValueType = typename Raw::ResolvedValueType;
static constexpr auto range = Raw::range;
static constexpr auto category = Raw::category;
bool operator==(const UnevaluatedCalc& other) const
{
return UnevaluatedCalcBase::equal(static_cast<const UnevaluatedCalcBase&>(other));
}
UnevaluatedCalc simplify(const CSSToLengthConversionData& conversionData, const CSSCalcSymbolTable& symbolTable) const
{
return static_cast<UnevaluatedCalc>(simplifyBase(conversionData, symbolTable));
}
};
// MARK: - Requires Conversion Data
template<Calc T> bool requiresConversionData(const T& unevaluatedCalc)
{
return unevaluatedCalc.requiresConversionData();
}
template<typename T> bool requiresConversionData(const T&)
{
static_assert(!Calc<T>);
return false;
}
template<typename... Ts> bool requiresConversionData(const std::variant<Ts...>& component)
{
return WTF::switchOn(component, [&](auto alternative) -> bool { return requiresConversionData(alternative); });
}
template<typename T> bool requiresConversionData(const std::optional<T>& component)
{
return component && requiresConversionData(*component);
}
// MARK: - Is UnevaluatedCalc
template<typename T> constexpr bool isUnevaluatedCalc(const T&)
{
return Calc<T>;
}
template<typename... Ts> constexpr bool isUnevaluatedCalc(const std::variant<Ts...>& component)
{
return WTF::switchOn(component, [&](auto alternative) -> bool { return isUnevaluatedCalc(alternative); });
}
template<typename T> constexpr bool isUnevaluatedCalc(const std::optional<T>& component)
{
return component && isUnevaluatedCalc(*component);
}
// MARK: Simplify
template<Calc T> auto simplifyUnevaluatedCalc(const T& unevaluatedCalc, const CSSToLengthConversionData& conversionData, const CSSCalcSymbolTable& symbolTable) -> T
{
return unevaluatedCalc.simplify(conversionData, symbolTable);
}
template<typename T> auto simplifyUnevaluatedCalc(const T& component, const CSSToLengthConversionData&, const CSSCalcSymbolTable&) -> T
{
return component;
}
template<typename... Ts> auto simplifyUnevaluatedCalc(const std::variant<Ts...>& component, const CSSToLengthConversionData& conversionData, const CSSCalcSymbolTable& symbolTable) -> std::variant<Ts...>
{
return WTF::switchOn(component, [&](auto alternative) -> bool { return simplifyUnevaluatedCalc(alternative, conversionData, symbolTable); });
}
template<typename T> decltype(auto) simplifyUnevaluatedCalc(const std::optional<T>& component, const CSSToLengthConversionData& conversionData, const CSSCalcSymbolTable& symbolTable)
{
return component ? std::make_optional(simplifyUnevaluatedCalc(*component, conversionData, symbolTable)) : std::nullopt;
}
// MARK: - Serialization
template<Calc T> struct Serialize<T> {
inline void operator()(StringBuilder& builder, const SerializationContext& context, const T& value)
{
value.serializationForCSS(builder, context);
}
};
// MARK: - Computed Style Dependencies
template<Calc T> struct ComputedStyleDependenciesCollector<T> {
inline void operator()(ComputedStyleDependencies& dependencies, const T& value)
{
value.collectComputedStyleDependencies(dependencies);
}
};
// MARK: - CSSValue Visitation
template<Calc T> struct CSSValueChildrenVisitor<T> {
inline IterationStatus operator()(NOESCAPE const Function<IterationStatus(CSSValue&)>& func, const T& value)
{
return value.visitChildren(func);
}
};
} // namespace CSS
} // namespace WebCore
namespace WTF {
template<WebCore::CSS::Calc T> struct IsSmartPtr<T> {
static constexpr bool value = true;
};
} // namespace WTF
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