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https://github.com/LadybirdBrowser/ladybird.git
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1f66b1cc13
ContainerQuery now stores its feature requirements. When evaluated, it uses these and the passed-in container name to identify a container element to match against, then evaluates its condition against that element. None of this is yet in use anywhere, but will be soon.
107 lines
3.8 KiB
C++
107 lines
3.8 KiB
C++
/*
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* Copyright (c) 2026, Sam Atkins <sam@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "ContainerQuery.h"
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#include <AK/NonnullRefPtr.h>
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#include <LibWeb/CSS/BooleanExpression.h>
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#include <LibWeb/CSS/ComputedProperties.h>
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#include <LibWeb/DOM/AbstractElement.h>
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#include <LibWeb/DOM/Element.h>
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#include <LibWeb/Dump.h>
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namespace Web::CSS {
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NonnullRefPtr<ContainerQuery> ContainerQuery::create(NonnullOwnPtr<BooleanExpression>&& condition)
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{
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return adopt_ref(*new ContainerQuery(move(condition)));
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}
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ContainerQuery::ContainerQuery(NonnullOwnPtr<BooleanExpression>&& condition)
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: m_condition(move(condition))
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, m_matches(m_condition->evaluate_to_boolean({}))
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{
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m_condition->collect_container_query_feature_requirements(m_feature_requirements);
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}
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static bool container_satisfies_requirements(DOM::Element const& element, ContainerQueryFeatureRequirements const& requirements)
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{
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auto style = element.computed_properties();
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if (!style)
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return false;
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auto container_type = style->container_type();
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if (requirements.requires_size_container && !container_type.is_size_container)
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return false;
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if (requirements.requires_inline_size_container && !(container_type.is_size_container || container_type.is_inline_size_container))
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return false;
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if (requirements.requires_block_size_container && !container_type.is_size_container)
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return false;
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if (requirements.requires_scroll_state_container && !container_type.is_scroll_state_container)
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return false;
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return true;
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}
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// https://drafts.csswg.org/css-conditional-5/#container-rule
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MatchResult ContainerQuery::evaluate(DOM::AbstractElement const& element, Optional<FlyString> const& container_name) const
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{
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// If the <container-query> contains unknown or unsupported container features, no query container will be selected
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// for that <container-condition>.
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if (m_feature_requirements.has_unknown_or_unsupported_feature)
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return MatchResult::Unknown;
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// For each element, the query container to be queried is selected from among the element’s ancestor query
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// containers that are established as a valid query container for all the container features in the
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// <container-query>.
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for (auto const* container = element.element().flat_tree_parent_element(); container; container = container->flat_tree_parent_element()) {
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// The <container-name> filters the set of query containers considered to just those with a matching query
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// container name.
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if (!container_name_matches(*container, container_name))
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continue;
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if (!container_satisfies_requirements(*container, m_feature_requirements))
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continue;
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// Once an eligible query container has been selected for an element, each container feature in the
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// <container-query> is evaluated against that query container.
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return m_condition->evaluate({
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.document = &element.document(),
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.query_container = container,
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});
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}
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// If no ancestor is an eligible query container, then the container query is unknown for that element.
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return MatchResult::Unknown;
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}
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String ContainerQuery::to_string() const
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{
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return m_condition->to_string();
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}
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void ContainerQuery::dump(StringBuilder& builder, int indent_levels) const
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{
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dump_indent(builder, indent_levels);
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builder.appendff("Container query: (matches = {})\n", m_matches);
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m_condition->dump(builder, indent_levels + 1);
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}
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bool container_name_matches(DOM::Element const& element, Optional<FlyString> const& container_name)
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{
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if (!container_name.has_value())
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return true;
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if (auto style = element.computed_properties())
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return style->container_name().contains_slow(*container_name);
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return false;
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}
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}
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