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LibWeb: Cache CSS::Selector's pseudo element at construction time

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Computing the pseudo element of a CSS::Selector was very hot when
mousing around on GitHub in Browser. A profile had it at ~10%.
After these changes, it's totally gone from the profile. :^)
This commit is contained in:
Andreas Kling 2022-03-13 16:28:20 +01:00
parent f5c2e87965
commit f88d65d9cb
2 changed files with 12 additions and 14 deletions
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23
Userland/Libraries/LibWeb/CSS/Selector.cpp
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@ -13,25 +13,22 @@ namespace Web::CSS {
Selector::Selector(Vector<CompoundSelector>&& compound_selectors)
: m_compound_selectors(move(compound_selectors))
{
// Note: This assumes that only one pseudo-element is allowed in a selector, and that it appears at the end.
// This is true currently, and there are no current proposals to change this, but you never know!
if (!m_compound_selectors.is_empty()) {
for (auto const& simple_selector : m_compound_selectors.last().simple_selectors) {
if (simple_selector.type == SimpleSelector::Type::PseudoElement) {
m_pseudo_element = simple_selector.pseudo_element;
break;
}
}
}
}
Selector::~Selector()
{
}
Optional<Selector::PseudoElement> Selector::pseudo_element() const
{
// Note: This assumes that only one pseudo-element is allowed in a selector, and that it appears at the end.
// This is true currently, and there are no current proposals to change this, but you never know!
if (compound_selectors().is_empty())
return {};
for (auto const& simple_selector : compound_selectors().last().simple_selectors) {
if (simple_selector.type == SimpleSelector::Type::PseudoElement)
return simple_selector.pseudo_element;
}
return {};
}
// https://www.w3.org/TR/selectors-4/#specificity-rules
u32 Selector::specificity() const
{