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LibWeb: Cache the qualified layer name in CSSRule

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This makes cascade layer filtering take <2% of CPU time when loading
https://vercel.com instead of 30%.
This commit is contained in:
Andreas Kling 2024-09-07 11:45:50 +02:00 • committed by Andreas Kling
commit 44e4ea3d7a
Notes: github-actions[bot] 2024-09-07 11:24:51 +00:00
4 changed files with 33 additions and 31 deletions
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54
Userland/Libraries/LibWeb/CSS/CSSRule.cpp
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@ -48,37 +48,39 @@ void CSSRule::set_parent_style_sheet(CSSStyleSheet* parent_style_sheet)
m_parent_style_sheet = parent_style_sheet;
}
String CSSRule::parent_layer_internal_qualified_name() const
FlyString const& CSSRule::parent_layer_internal_qualified_name() const
{
// TODO: Cache this?
Vector<FlyString> layer_names;
for (auto* rule = parent_rule(); rule; rule = rule->parent_rule()) {
switch (rule->type()) {
case CSSRule::Type::Import:
// TODO: Handle `layer(foo)` in import rules once we implement that.
break;
if (!m_cached_layer_name.has_value()) {
Vector<FlyString> layer_names;
for (auto* rule = parent_rule(); rule; rule = rule->parent_rule()) {
switch (rule->type()) {
case CSSRule::Type::Import:
// TODO: Handle `layer(foo)` in import rules once we implement that.
break;
case CSSRule::Type::LayerBlock: {
auto& layer_block = static_cast<CSSLayerBlockRule const&>(*rule);
layer_names.append(layer_block.internal_name());
break;
case CSSRule::Type::LayerBlock: {
auto& layer_block = static_cast<CSSLayerBlockRule const&>(*rule);
layer_names.append(layer_block.internal_name());
break;
}
// Ignore everything else
// Note that LayerStatement cannot have child rules so we still ignore it here.
case CSSRule::Type::LayerStatement:
case CSSRule::Type::Style:
case CSSRule::Type::Media:
case CSSRule::Type::FontFace:
case CSSRule::Type::Keyframes:
case CSSRule::Type::Keyframe:
case CSSRule::Type::Namespace:
case CSSRule::Type::Supports:
break;
}
}
// Ignore everything else
// Note that LayerStatement cannot have child rules so we still ignore it here.
case CSSRule::Type::LayerStatement:
case CSSRule::Type::Style:
case CSSRule::Type::Media:
case CSSRule::Type::FontFace:
case CSSRule::Type::Keyframes:
case CSSRule::Type::Keyframe:
case CSSRule::Type::Namespace:
case CSSRule::Type::Supports:
break;
}
m_cached_layer_name = MUST(String::join("."sv, layer_names.in_reverse()));
}
return MUST(String::join("."sv, layer_names.in_reverse()));
return m_cached_layer_name.value();
}
}