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/*
* Copyright (C) 2022 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. 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 "ContainerQueryEvaluator.h"
#include "CSSPrimitiveValue.h"
#include "CSSToLengthConversionData.h"
#include "CSSValueList.h"
#include "ComposedTreeAncestorIterator.h"
#include "ContainerQueryFeatures.h"
#include "Document.h"
#include "MediaList.h"
#include "NodeRenderStyle.h"
#include "RenderStyleInlines.h"
#include "RenderView.h"
#include "StyleRule.h"
#include "StyleScope.h"
namespace WebCore::Style {
ContainerQueryEvaluator::ContainerQueryEvaluator(const Element& element, SelectionMode selectionMode, ScopeOrdinal scopeOrdinal, SelectorMatchingState* selectorMatchingState)
: m_element(element)
, m_selectionMode(selectionMode)
, m_scopeOrdinal(scopeOrdinal)
, m_selectorMatchingState(selectorMatchingState)
{
}
bool ContainerQueryEvaluator::evaluate(const CQ::ContainerQuery& containerQuery) const
{
auto context = featureEvaluationContextForQuery(containerQuery);
if (!context)
return false;
return evaluateCondition(containerQuery.condition, *context) == MQ::EvaluationResult::True;
}
auto ContainerQueryEvaluator::featureEvaluationContextForQuery(const CQ::ContainerQuery& containerQuery) const -> std::optional<MQ::FeatureEvaluationContext>
{
// "For each element, the query container to be queried is selected from among the element’s
// ancestor query containers that have a valid container-type for all the container features
// in the <container-condition>. The optional <container-name> filters the set of query containers
// considered to just those with a matching query container name."
// https://drafts.csswg.org/css-contain-3/#container-rule
auto* cachedQueryContainers = m_selectorMatchingState ? &m_selectorMatchingState->queryContainers : nullptr;
auto* container = selectContainer(containerQuery.axisFilter, containerQuery.name, m_element.get(), m_selectionMode, m_scopeOrdinal, cachedQueryContainers);
if (!container)
return { };
if (!container->renderer())
return MQ::FeatureEvaluationContext { m_element->document() };
auto& renderer = *container->renderer();
return MQ::FeatureEvaluationContext {
m_element->document(),
CSSToLengthConversionData { renderer.style(), m_element->document().documentElement()->renderStyle(), nullptr, &renderer.view(), container },
&renderer
};
}
const Element* ContainerQueryEvaluator::selectContainer(OptionSet<CQ::Axis> axes, const String& name, const Element& element, SelectionMode selectionMode, ScopeOrdinal scopeOrdinal, const CachedQueryContainers* cachedQueryContainers)
{
// "For each element, the query container to be queried is selected from among the element’s
// ancestor query containers that have a valid container-type for all the container features
// in the <container-condition>. The optional <container-name> filters the set of query containers
// considered to just those with a matching query container name."
// https://drafts.csswg.org/css-contain-3/#container-rule
auto isValidContainerForRequiredAxes = [&](ContainerType containerType, const RenderElement* principalBox) {
switch (containerType) {
case ContainerType::Size:
return true;
case ContainerType::InlineSize:
// Without a principal box the container matches but the query against it will evaluate to Unknown.
if (!principalBox)
return true;
if (axes.contains(CQ::Axis::Block))
return false;
return !axes.contains(principalBox->isHorizontalWritingMode() ? CQ::Axis::Height : CQ::Axis::Width);
case ContainerType::Normal:
return false;
}
RELEASE_ASSERT_NOT_REACHED();
};
auto isContainerForQuery = [&](const Element& element) {
auto* style = element.existingComputedStyle();
if (!style)
return false;
if (!isValidContainerForRequiredAxes(style->containerType(), element.renderer()))
return false;
if (name.isEmpty())
return true;
return style->containerNames().contains(name);
};
auto findOriginatingElement = [&]() -> const Element* {
// ::part() selectors can query its originating host, but not internal query containers inside the shadow tree.
if (scopeOrdinal <= ScopeOrdinal::ContainingHost)
return hostForScopeOrdinal(element, scopeOrdinal);
// ::slotted() selectors can query containers inside the shadow tree, including the slot itself.
if (scopeOrdinal >= ScopeOrdinal::FirstSlot && scopeOrdinal <= ScopeOrdinal::SlotLimit)
return assignedSlotForScopeOrdinal(element, scopeOrdinal);
return nullptr;
};
if (auto* originatingElement = findOriginatingElement()) {
// For selectors with pseudo elements, query containers can be established by the shadow-including inclusive ancestors of the ultimate originating element.
for (auto* ancestor = originatingElement; ancestor; ancestor = ancestor->parentOrShadowHostElement()) {
if (isContainerForQuery(*ancestor))
return ancestor;
}
return nullptr;
}
if (selectionMode == SelectionMode::PseudoElement) {
if (isContainerForQuery(element))
return &element;
}
if (cachedQueryContainers) {
for (auto& container : makeReversedRange(*cachedQueryContainers)) {
if (isContainerForQuery(container))
return container.ptr();
}
return { };
}
for (auto* ancestor = element.parentOrShadowHostElement(); ancestor; ancestor = ancestor->parentOrShadowHostElement()) {
if (isContainerForQuery(*ancestor))
return ancestor;
}
return { };
}
}
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