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LibWeb: Collect interesting document-wide insights about CSS selectors

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Starting out with these two things:
- Whether any :has() selectors are present
- The set of all names referenced by attribute selectors
This commit is contained in:
Andreas Kling 2024-12-23 15:22:10 +01:00 • committed by Andreas Kling
commit 6983c65c54
Notes: github-actions[bot] 2024-12-23 16:06:10 +00:00
2 changed files with 42 additions and 22 deletions
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48
Libraries/LibWeb/CSS/StyleComputer.cpp
View file

@ -2503,24 +2503,26 @@ static Optional<SimplifiedSelectorForBucketing> is_roundabout_selector_bucketabl
return {};
}
static bool contains_has_pseudo_class(Selector const& selector)
void StyleComputer::collect_selector_insights(Selector const& selector, SelectorInsights& insights)
{
for (auto const& compound_selector : selector.compound_selectors()) {
for (auto const& simple_selector : compound_selector.simple_selectors) {
if (simple_selector.type != CSS::Selector::SimpleSelector::Type::PseudoClass)
continue;
if (simple_selector.pseudo_class().type == CSS::PseudoClass::Has)
return true;
for (auto const& argument_selector : simple_selector.pseudo_class().argument_selector_list) {
if (contains_has_pseudo_class(argument_selector))
return true;
if (simple_selector.type == Selector::SimpleSelector::Type::Attribute) {
insights.all_names_used_in_attribute_selectors.set(simple_selector.attribute().qualified_name.name.lowercase_name);
}
if (simple_selector.type == Selector::SimpleSelector::Type::PseudoClass) {
if (simple_selector.pseudo_class().type == PseudoClass::Has) {
insights.has_has_selectors = true;
}
for (auto const& argument_selector : simple_selector.pseudo_class().argument_selector_list) {
collect_selector_insights(*argument_selector, insights);
}
}
}
}
return false;
}
NonnullOwnPtr<StyleComputer::RuleCache> StyleComputer::make_rule_cache_for_cascade_origin(CascadeOrigin cascade_origin)
NonnullOwnPtr<StyleComputer::RuleCache> StyleComputer::make_rule_cache_for_cascade_origin(CascadeOrigin cascade_origin, SelectorInsights& insights)
{
auto rule_cache = make<RuleCache>();
@ -2563,8 +2565,7 @@ NonnullOwnPtr<StyleComputer::RuleCache> StyleComputer::make_rule_cache_for_casca
bool contains_root_pseudo_class = false;
Optional<CSS::Selector::PseudoElement::Type> pseudo_element;
if (!rule_cache->has_has_selectors)
rule_cache->has_has_selectors = contains_has_pseudo_class(selector);
collect_selector_insights(selector, insights);
for (auto const& simple_selector : selector.compound_selectors().last().simple_selectors) {
if (!matching_rule.contains_pseudo_element) {
@ -2807,17 +2808,17 @@ void StyleComputer::build_qualified_layer_names_cache()
void StyleComputer::build_rule_cache()
{
m_selector_insights = make<SelectorInsights>();
if (auto user_style_source = document().page().user_style(); user_style_source.has_value()) {
m_user_style_sheet = GC::make_root(parse_css_stylesheet(CSS::Parser::ParsingContext(document()), user_style_source.value()));
}
build_qualified_layer_names_cache();
m_author_rule_cache = make_rule_cache_for_cascade_origin(CascadeOrigin::Author);
m_user_rule_cache = make_rule_cache_for_cascade_origin(CascadeOrigin::User);
m_user_agent_rule_cache = make_rule_cache_for_cascade_origin(CascadeOrigin::UserAgent);
m_has_has_selectors = m_author_rule_cache->has_has_selectors || m_user_rule_cache->has_has_selectors || m_user_agent_rule_cache->has_has_selectors;
m_author_rule_cache = make_rule_cache_for_cascade_origin(CascadeOrigin::Author, *m_selector_insights);
m_user_rule_cache = make_rule_cache_for_cascade_origin(CascadeOrigin::User, *m_selector_insights);
m_user_agent_rule_cache = make_rule_cache_for_cascade_origin(CascadeOrigin::UserAgent, *m_selector_insights);
}
void StyleComputer::invalidate_rule_cache()
@ -2999,4 +3000,17 @@ size_t StyleComputer::number_of_css_font_faces_with_loading_in_progress() const
return count;
}
bool StyleComputer::has_has_selectors() const
{
build_rule_cache_if_needed();
return m_selector_insights->has_has_selectors;
}
bool StyleComputer::has_attribute_selector(FlyString const& attribute_name) const
{
build_rule_cache_if_needed();
return m_selector_insights->all_names_used_in_attribute_selectors.contains(attribute_name);
}
}

16
Libraries/LibWeb/CSS/StyleComputer.h
View file

@ -169,7 +169,8 @@ public:
};
void collect_animation_into(DOM::Element&, Optional<CSS::Selector::PseudoElement::Type>, GC::Ref<Animations::KeyframeEffect> animation, ComputedProperties&, AnimationRefresh = AnimationRefresh::No) const;
[[nodiscard]] bool has_has_selectors() const { return m_has_has_selectors; }
[[nodiscard]] bool has_has_selectors() const;
[[nodiscard]] bool has_attribute_selector(FlyString const& attribute_name) const;
size_t number_of_css_font_faces_with_loading_in_progress() const;
@ -247,6 +248,11 @@ private:
GC::Ref<DOM::Document> m_document;
struct SelectorInsights {
bool has_has_selectors { false };
HashTable<FlyString> all_names_used_in_attribute_selectors;
};
struct RuleCache {
HashMap<FlyString, Vector<MatchingRule>> rules_by_id;
HashMap<FlyString, Vector<MatchingRule>> rules_by_class;
@ -257,15 +263,15 @@ private:
Vector<MatchingRule> other_rules;
HashMap<FlyString, NonnullRefPtr<Animations::KeyframeEffect::KeyFrameSet>> rules_by_animation_keyframes;
bool has_has_selectors { false };
};
NonnullOwnPtr<RuleCache> make_rule_cache_for_cascade_origin(CascadeOrigin);
NonnullOwnPtr<RuleCache> make_rule_cache_for_cascade_origin(CascadeOrigin, SelectorInsights&);
RuleCache const& rule_cache_for_cascade_origin(CascadeOrigin) const;
bool m_has_has_selectors { false };
static void collect_selector_insights(Selector const&, SelectorInsights&);
OwnPtr<SelectorInsights> m_selector_insights;
OwnPtr<RuleCache> m_author_rule_cache;
OwnPtr<RuleCache> m_user_rule_cache;
OwnPtr<RuleCache> m_user_agent_rule_cache;