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/*
* 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. ``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 "StyleBuilderChecking.h"
#include "StyleLengthWrapper.h"
#include "StylePrimitiveNumericTypes+Conversions.h"
namespace WebCore {
namespace Style {
// MARK: - Conversion
template<LengthWrapperBaseDerived T> struct CSSValueConversion<T> {
template<typename K>
static auto processKeyword(const K& keyword, CSSValueID valueID, std::optional<T>& result) -> bool
{
if (valueID == keyword.value) {
result = T { keyword };
return true;
}
// A few keywords have alternative spellings.
// FIXME: Find a generic solution to this problem.
if constexpr (std::same_as<K, CSS::Keyword::MinContent>) {
if (valueID == CSSValueWebkitMinContent) {
result = T { keyword };
return true;
}
} else if constexpr (std::same_as<K, CSS::Keyword::MaxContent>) {
if (valueID == CSSValueWebkitMaxContent) {
result = T { keyword };
return true;
}
} else if constexpr (std::same_as<K, CSS::Keyword::FitContent>) {
if (valueID == CSSValueWebkitFitContent) {
result = T { keyword };
return true;
}
}
return false;
}
static auto selectConversionData(BuilderState& builderState) -> CSSToLengthConversionData
{
if constexpr (T::Fixed::range.zoomOptions == CSS::RangeZoomOptions::Default) {
return builderState.useSVGZoomRulesForLength()
? builderState.cssToLengthConversionData().copyWithAdjustedZoom(1.0f)
: builderState.cssToLengthConversionData();
} else if constexpr (T::Fixed::range.zoomOptions == CSS::RangeZoomOptions::Unzoomed) {
if (evaluationTimeZoomEnabled(builderState))
return builderState.cssToLengthConversionData().copyWithAdjustedZoom(1.0f, T::Fixed::range.zoomOptions);
return builderState.useSVGZoomRulesForLength()
? builderState.cssToLengthConversionData().copyWithAdjustedZoom(1.0f)
: builderState.cssToLengthConversionData();
}
}
auto operator()(BuilderState& state, const CSSPrimitiveValue& primitiveValue) -> T
{
using namespace CSS::Literals;
auto convertLengthPercentage = [&] -> T {
auto conversionData = selectConversionData(state);
if (primitiveValue.isLength()) {
return T {
typename T::Fixed {
CSS::clampToRange<T::Fixed::range, float>(primitiveValue.resolveAsLength(conversionData), minValueForCssLength, maxValueForCssLength),
},
primitiveValue.primitiveType() == CSSUnitType::CSS_QUIRKY_EM
};
}
if (primitiveValue.isPercentage()) {
return T {
typename T::Percentage {
CSS::clampToRange<T::Percentage::range, float>(primitiveValue.resolveAsPercentage(conversionData)),
}
};
}
if (primitiveValue.isCalculatedPercentageWithLength()) {
return T {
typename T::Calc {
primitiveValue.protectedCssCalcValue()->createCalculationValue(conversionData, CSSCalcSymbolTable { })
}
};
}
ASSERT_NOT_REACHED();
state.setCurrentPropertyInvalidAtComputedValueTime();
return 0_css_px;
};
if constexpr (!T::Keywords::count)
return convertLengthPercentage();
else {
auto valueID = primitiveValue.valueID();
if (valueID == CSSValueInvalid)
return convertLengthPercentage();
constexpr auto keywordsTuple = T::Keywords::tuple;
auto result = std::apply([&](const auto& ...keyword) {
std::optional<T> result;
(processKeyword(keyword, valueID, result) || ...);
return result;
}, keywordsTuple);
if (result)
return *result;
state.setCurrentPropertyInvalidAtComputedValueTime();
return 0_css_px;
}
}
auto operator()(BuilderState& state, const CSSValue& value) -> T
{
using namespace CSS::Literals;
RefPtr primitiveValue = requiredDowncast<CSSPrimitiveValue>(state, value);
if (!primitiveValue)
return 0_css_px;
return this->operator()(state, *primitiveValue);
}
};
} // namespace Style
} // namespace WebCore
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