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/*
* Copyright (C) 2025 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.
*/
#include "config.h"
#include "StylePositionTryFallback.h"
#include "StyleBuilderChecking.h"
#include "StylePrimitiveKeyword+CSSValueConversion.h"
#include "StylePrimitiveKeyword+CSSValueCreation.h"
#include "StylePrimitiveKeyword+Logging.h"
#include "StylePrimitiveKeyword+Serialization.h"
#include "StylePropertiesInlines.h"
namespace WebCore {
namespace Style {
bool PositionTryFallback::PositionArea::operator==(const PositionTryFallback::PositionArea& other) const
{
if (properties && other.properties) {
if (properties == other.properties)
return true;
Ref strongProperties = *properties;
Ref strongOtherProperties = *other.properties;
auto lhsPositionArea = strongProperties->getPropertyCSSValue(CSSPropertyPositionArea);
ASSERT(lhsPositionArea);
auto rhsPositionArea = strongOtherProperties->getPropertyCSSValue(CSSPropertyPositionArea);
ASSERT(rhsPositionArea);
return *lhsPositionArea == *rhsPositionArea;
}
return !properties && !other.properties;
}
bool PositionTryFallback::operator==(const PositionTryFallback& other) const
{
if (positionArea.properties && other.positionArea.properties)
return positionArea == other.positionArea;
if (!positionArea.properties && !other.positionArea.properties)
return ruleAndTactics == other.ruleAndTactics;
// If we got here, this and other don't have the same type (e.g comparing position-area with rule + tactics)
return false;
}
// MARK: - Conversion
auto CSSValueConversion<PositionTryFallback>::operator()(BuilderState& state, const CSSValue& value) -> PositionTryFallback
{
if (RefPtr valueList = dynamicDowncast<CSSValueList>(value)) {
if (valueList->separator() != CSSValueList::SpaceSeparator) {
state.setCurrentPropertyInvalidAtComputedValueTime();
return { };
}
auto rule = std::optional<ScopedName> { };
auto tactics = SpaceSeparatedVector<PositionTryFallbackTactic> { };
for (Ref item : *valueList) {
switch (item->valueID()) {
case CSSValueFlipBlock:
tactics.value.append(PositionTryFallbackTactic::FlipBlock);
break;
case CSSValueFlipInline:
tactics.value.append(PositionTryFallbackTactic::FlipInline);
break;
case CSSValueFlipStart:
tactics.value.append(PositionTryFallbackTactic::FlipStart);
break;
case CSSValueFlipX:
tactics.value.append(PositionTryFallbackTactic::FlipX);
break;
case CSSValueFlipY:
tactics.value.append(PositionTryFallbackTactic::FlipY);
break;
case CSSValueInvalid:
if (item->isCustomIdent() && !rule) {
rule = ScopedName { AtomString { item->customIdent() }, state.styleScopeOrdinal() };
break;
}
[[fallthrough]];
default:
state.setCurrentPropertyInvalidAtComputedValueTime();
return { };
}
}
if (tactics.isEmpty()) {
return {
.ruleAndTactics = {
.rule = WTFMove(rule),
}
};
} else {
return {
.ruleAndTactics = {
.rule = WTFMove(rule),
.tactics = WTFMove(tactics),
}
};
}
}
// Turn the inlined position-area fallback into properties object that can be applied similarly to @position-try declarations.
auto property = CSSProperty { CSSPropertyPositionArea, Ref { const_cast<CSSValue&>(value) } };
return {
.positionArea = { ImmutableStyleProperties::createDeduplicating(std::span { &property, 1 }, HTMLStandardMode) }
};
}
auto CSSValueCreation<PositionTryFallback::PositionArea>::operator()(CSSValuePool&, const RenderStyle&, const PositionTryFallback::PositionArea& value) -> Ref<CSSValue>
{
return RefPtr { value.properties }->getPropertyCSSValue(CSSPropertyPositionArea).releaseNonNull();
}
// MARK: - Serialization
void Serialize<PositionTryFallback::PositionArea>::operator()(StringBuilder& builder, const CSS::SerializationContext& context, const RenderStyle&, const PositionTryFallback::PositionArea& value)
{
builder.append(RefPtr { value.properties }->getPropertyCSSValue(CSSPropertyPositionArea)->cssText(context));
}
// MARK: - Logging
TextStream& operator<<(TextStream& ts, const PositionTryFallback::PositionArea& value)
{
return ts << RefPtr { value.properties }->getPropertyValue(CSSPropertyPositionArea);
}
} // namespace Style
} // namespace WebCore
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