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https://github.com/LadybirdBrowser/ladybird.git
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LibWeb: Prepare RuleCache for being reusable to store hover rules
Moves code that allows to add and iterate over rules in cache into methods defined for RuleCache.
This commit is contained in:
Aliaksandr Kalenik
Alexander Kalenik
parent
d3c51ea05e
commit
ff8826d582
Notes:
github-actions[bot]
2025-02-22 09:15:52 +00:00
Author: https://github.com/kalenikaliaksandr
Commit: ff8826d582
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3650
2 changed files with 129 additions and 125 deletions
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@ -386,7 +386,7 @@ void StyleComputer::for_each_stylesheet(CascadeOrigin cascade_origin, Callback c
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}
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}
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StyleComputer::RuleCache const* StyleComputer::rule_cache_for_cascade_origin(CascadeOrigin cascade_origin, FlyString const& qualified_layer_name, GC::Ptr<DOM::ShadowRoot const> shadow_root) const
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RuleCache const* StyleComputer::rule_cache_for_cascade_origin(CascadeOrigin cascade_origin, FlyString const& qualified_layer_name, GC::Ptr<DOM::ShadowRoot const> shadow_root) const
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{
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auto const* rule_caches_for_document_and_shadow_roots = [&]() -> RuleCachesForDocumentAndShadowRoots const* {
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switch (cascade_origin) {
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@ -526,33 +526,10 @@ Vector<MatchingRule const*> StyleComputer::collect_matching_rules(DOM::Element c
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};
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auto add_rules_from_cache = [&](RuleCache const& rule_cache) {
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for (auto const& class_name : element.class_names()) {
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if (auto it = rule_cache.rules_by_class.find(class_name); it != rule_cache.rules_by_class.end())
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add_rules_to_run(it->value);
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}
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if (auto id = element.id(); id.has_value()) {
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if (auto it = rule_cache.rules_by_id.find(id.value()); it != rule_cache.rules_by_id.end())
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add_rules_to_run(it->value);
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}
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if (auto it = rule_cache.rules_by_tag_name.find(element.local_name()); it != rule_cache.rules_by_tag_name.end())
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add_rules_to_run(it->value);
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if (pseudo_element.has_value()) {
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if (CSS::Selector::PseudoElement::is_known_pseudo_element_type(pseudo_element.value())) {
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add_rules_to_run(rule_cache.rules_by_pseudo_element.at(to_underlying(pseudo_element.value())));
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} else {
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// NOTE: We don't cache rules for unknown pseudo-elements. They can't match anything anyway.
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}
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}
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if (element.is_document_element())
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add_rules_to_run(rule_cache.root_rules);
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element.for_each_attribute([&](auto& name, auto&) {
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if (auto it = rule_cache.rules_by_attribute_name.find(name); it != rule_cache.rules_by_attribute_name.end())
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add_rules_to_run(it->value);
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rule_cache.for_each_matching_rules(element, pseudo_element, [&](auto const& matching_rules) {
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add_rules_to_run(matching_rules);
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return IterationDecision::Continue;
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});
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add_rules_to_run(rule_cache.other_rules);
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};
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if (auto const* rule_cache = rule_cache_for_cascade_origin(cascade_origin, qualified_layer_name, nullptr))
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@ -2662,14 +2639,6 @@ void StyleComputer::collect_selector_insights(Selector const& selector, Selector
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void StyleComputer::make_rule_cache_for_cascade_origin(CascadeOrigin cascade_origin, SelectorInsights& insights, Vector<MatchingRule>& hover_rules)
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{
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size_t num_class_rules = 0;
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size_t num_id_rules = 0;
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size_t num_tag_name_rules = 0;
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size_t num_pseudo_element_rules = 0;
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size_t num_root_rules = 0;
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size_t num_attribute_rules = 0;
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size_t num_hover_rules = 0;
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Vector<MatchingRule> matching_rules;
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size_t style_sheet_index = 0;
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for_each_stylesheet(cascade_origin, [&](auto& sheet, GC::Ptr<DOM::ShadowRoot> shadow_root) {
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@ -2735,21 +2704,18 @@ void StyleComputer::make_rule_cache_for_cascade_origin(CascadeOrigin cascade_ori
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if (simple_selector.type == CSS::Selector::SimpleSelector::Type::PseudoElement) {
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matching_rule.contains_pseudo_element = true;
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pseudo_element = simple_selector.pseudo_element().type();
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++num_pseudo_element_rules;
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}
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}
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if (!contains_root_pseudo_class) {
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if (simple_selector.type == CSS::Selector::SimpleSelector::Type::PseudoClass
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&& simple_selector.pseudo_class().type == CSS::PseudoClass::Root) {
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contains_root_pseudo_class = true;
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++num_root_rules;
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}
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}
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if (!matching_rule.must_be_hovered) {
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if (simple_selector.type == CSS::Selector::SimpleSelector::Type::PseudoClass && simple_selector.pseudo_class().type == CSS::PseudoClass::Hover) {
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matching_rule.must_be_hovered = true;
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++num_hover_rules;
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}
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if (simple_selector.type == CSS::Selector::SimpleSelector::Type::PseudoClass
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&& (simple_selector.pseudo_class().type == CSS::PseudoClass::Is
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@ -2761,7 +2727,6 @@ void StyleComputer::make_rule_cache_for_cascade_origin(CascadeOrigin cascade_ori
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if (simple_argument_selector.type == CSS::Selector::SimpleSelector::Type::PseudoClass
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&& simple_argument_selector.pseudo_class().type == CSS::PseudoClass::Hover) {
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matching_rule.must_be_hovered = true;
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++num_hover_rules;
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}
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}
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}
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@ -2772,80 +2737,7 @@ void StyleComputer::make_rule_cache_for_cascade_origin(CascadeOrigin cascade_ori
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hover_rules.append(matching_rule);
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}
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// NOTE: We traverse the simple selectors in reverse order to make sure that class/ID buckets are preferred over tag buckets
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// in the common case of div.foo or div#foo selectors.
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bool added_to_bucket = false;
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auto add_to_id_bucket = [&](FlyString const& name) {
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rule_cache.rules_by_id.ensure(name).append(move(matching_rule));
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++num_id_rules;
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added_to_bucket = true;
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};
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auto add_to_class_bucket = [&](FlyString const& name) {
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rule_cache.rules_by_class.ensure(name).append(move(matching_rule));
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++num_class_rules;
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added_to_bucket = true;
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};
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auto add_to_tag_name_bucket = [&](FlyString const& name) {
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rule_cache.rules_by_tag_name.ensure(name).append(move(matching_rule));
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++num_tag_name_rules;
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added_to_bucket = true;
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};
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for (auto const& simple_selector : selector.compound_selectors().last().simple_selectors.in_reverse()) {
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if (simple_selector.type == CSS::Selector::SimpleSelector::Type::Id) {
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add_to_id_bucket(simple_selector.name());
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break;
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}
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if (simple_selector.type == CSS::Selector::SimpleSelector::Type::Class) {
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add_to_class_bucket(simple_selector.name());
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break;
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}
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if (simple_selector.type == CSS::Selector::SimpleSelector::Type::TagName) {
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add_to_tag_name_bucket(simple_selector.qualified_name().name.lowercase_name);
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break;
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}
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// NOTE: Selectors like `:is/where(.foo)` and `:is/where(.foo .bar)` are bucketed as class selectors for `foo` and `bar` respectively.
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if (auto simplified = is_roundabout_selector_bucketable_as_something_simpler(simple_selector); simplified.has_value()) {
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if (simplified->type == CSS::Selector::SimpleSelector::Type::TagName) {
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add_to_tag_name_bucket(simplified->name);
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break;
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}
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if (simplified->type == CSS::Selector::SimpleSelector::Type::Class) {
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add_to_class_bucket(simplified->name);
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break;
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}
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if (simplified->type == CSS::Selector::SimpleSelector::Type::Id) {
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add_to_id_bucket(simplified->name);
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break;
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}
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}
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}
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if (!added_to_bucket) {
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if (matching_rule.contains_pseudo_element) {
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if (CSS::Selector::PseudoElement::is_known_pseudo_element_type(pseudo_element.value())) {
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rule_cache.rules_by_pseudo_element[to_underlying(pseudo_element.value())].append(move(matching_rule));
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} else {
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// NOTE: We don't cache rules for unknown pseudo-elements. They can't match anything anyway.
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}
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} else if (contains_root_pseudo_class) {
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rule_cache.root_rules.append(move(matching_rule));
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} else {
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for (auto const& simple_selector : selector.compound_selectors().last().simple_selectors) {
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if (simple_selector.type == CSS::Selector::SimpleSelector::Type::Attribute) {
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rule_cache.rules_by_attribute_name.ensure(simple_selector.attribute().qualified_name.name.lowercase_name).append(move(matching_rule));
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++num_attribute_rules;
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added_to_bucket = true;
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break;
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}
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}
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if (!added_to_bucket) {
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rule_cache.other_rules.append(move(matching_rule));
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}
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}
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}
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rule_cache.add_rule(matching_rule, pseudo_element, contains_root_pseudo_class);
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}
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++rule_index;
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});
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@ -3174,4 +3066,113 @@ bool StyleComputer::have_has_selectors() const
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return m_selector_insights->has_has_selectors;
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}
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void RuleCache::add_rule(MatchingRule const& matching_rule, Optional<Selector::PseudoElement::Type> pseudo_element, bool contains_root_pseudo_class)
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{
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// NOTE: We traverse the simple selectors in reverse order to make sure that class/ID buckets are preferred over tag buckets
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// in the common case of div.foo or div#foo selectors.
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auto add_to_id_bucket = [&](FlyString const& name) {
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rules_by_id.ensure(name).append(matching_rule);
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};
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auto add_to_class_bucket = [&](FlyString const& name) {
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rules_by_class.ensure(name).append(matching_rule);
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};
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auto add_to_tag_name_bucket = [&](FlyString const& name) {
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rules_by_tag_name.ensure(name).append(matching_rule);
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};
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for (auto const& simple_selector : matching_rule.selector.compound_selectors().last().simple_selectors.in_reverse()) {
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if (simple_selector.type == Selector::SimpleSelector::Type::Id) {
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add_to_id_bucket(simple_selector.name());
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return;
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}
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if (simple_selector.type == Selector::SimpleSelector::Type::Class) {
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add_to_class_bucket(simple_selector.name());
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return;
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}
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if (simple_selector.type == Selector::SimpleSelector::Type::TagName) {
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add_to_tag_name_bucket(simple_selector.qualified_name().name.lowercase_name);
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return;
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}
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// NOTE: Selectors like `:is/where(.foo)` and `:is/where(.foo .bar)` are bucketed as class selectors for `foo` and `bar` respectively.
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if (auto simplified = is_roundabout_selector_bucketable_as_something_simpler(simple_selector); simplified.has_value()) {
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if (simplified->type == Selector::SimpleSelector::Type::TagName) {
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add_to_tag_name_bucket(simplified->name);
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return;
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}
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if (simplified->type == Selector::SimpleSelector::Type::Class) {
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add_to_class_bucket(simplified->name);
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return;
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}
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if (simplified->type == Selector::SimpleSelector::Type::Id) {
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add_to_id_bucket(simplified->name);
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return;
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}
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}
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}
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if (matching_rule.contains_pseudo_element) {
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if (Selector::PseudoElement::is_known_pseudo_element_type(pseudo_element.value())) {
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rules_by_pseudo_element[to_underlying(pseudo_element.value())].append(matching_rule);
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} else {
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// NOTE: We don't cache rules for unknown pseudo-elements. They can't match anything anyway.
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}
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} else if (contains_root_pseudo_class) {
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root_rules.append(matching_rule);
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} else {
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for (auto const& simple_selector : matching_rule.selector.compound_selectors().last().simple_selectors) {
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if (simple_selector.type == Selector::SimpleSelector::Type::Attribute) {
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rules_by_attribute_name.ensure(simple_selector.attribute().qualified_name.name.lowercase_name).append(matching_rule);
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return;
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}
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}
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other_rules.append(matching_rule);
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}
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}
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void RuleCache::for_each_matching_rules(DOM::Element const& element, Optional<Selector::PseudoElement::Type> pseudo_element, Function<IterationDecision(Vector<MatchingRule> const&)> callback) const
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{
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for (auto const& class_name : element.class_names()) {
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if (auto it = rules_by_class.find(class_name); it != rules_by_class.end()) {
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if (callback(it->value) == IterationDecision::Break)
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return;
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}
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}
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if (auto id = element.id(); id.has_value()) {
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if (auto it = rules_by_id.find(id.value()); it != rules_by_id.end()) {
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if (callback(it->value) == IterationDecision::Break)
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return;
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}
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}
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if (auto it = rules_by_tag_name.find(element.local_name()); it != rules_by_tag_name.end()) {
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if (callback(it->value) == IterationDecision::Break)
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return;
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}
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if (pseudo_element.has_value()) {
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if (Selector::PseudoElement::is_known_pseudo_element_type(pseudo_element.value())) {
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if (callback(rules_by_pseudo_element.at(to_underlying(pseudo_element.value()))) == IterationDecision::Break)
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return;
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} else {
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// NOTE: We don't cache rules for unknown pseudo-elements. They can't match anything anyway.
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}
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}
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if (element.is_document_element()) {
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if (callback(root_rules) == IterationDecision::Break)
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return;
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}
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IterationDecision decision = IterationDecision::Continue;
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element.for_each_attribute([&](auto& name, auto&) {
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if (auto it = rules_by_attribute_name.find(name); it != rules_by_attribute_name.end()) {
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decision = callback(it->value);
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}
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});
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if (decision == IterationDecision::Break)
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return;
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(void)callback(other_rules);
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}
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}
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