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LibWeb: Cache whether there are any :has() selectors present

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As useful as they may be to web developers, :has() selectors complicate
the style invalidation process quite a lot.

Let's have StyleComputer keep track of whether they are present at all
in the current set of active style sheets. This will allow us to
implement fast-path optimizations when there are no :has() selectors.
This commit is contained in:
Andreas Kling 2024-09-19 13:27:37 +02:00 • committed by Andreas Kling
commit 8beb7c7700
Notes: github-actions[bot] 2024-09-22 18:08:47 +00:00
2 changed files with 9 additions and 0 deletions
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4
Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
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@ -2479,6 +2479,8 @@ NonnullOwnPtr<StyleComputer::RuleCache> StyleComputer::make_rule_cache_for_casca
Optional<CSS::Selector::PseudoElement::Type> pseudo_element;
for (auto const& simple_selector : selector.compound_selectors().last().simple_selectors) {
if (!rule_cache->has_has_selectors && simple_selector.type == CSS::Selector::SimpleSelector::Type::PseudoClass && simple_selector.pseudo_class().type == CSS::PseudoClass::Has)
rule_cache->has_has_selectors = true;
if (!matching_rule.contains_pseudo_element) {
if (simple_selector.type == CSS::Selector::SimpleSelector::Type::PseudoElement) {
matching_rule.contains_pseudo_element = true;
@ -2726,6 +2728,8 @@ void StyleComputer::build_rule_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;
}
void StyleComputer::invalidate_rule_cache()