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Optimize single-rule CSS selector matching:

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Add a fast path that directly evaluates selectors containing one rule,
  avoiding combinator traversal and switch overhead for common class, ID,
  tag, and pseudo-class selectors.

  Move complex selector traversal into a dedicated function and cache rule
  counts in selector loops. Add focused matching coverage and document the
  Phase 7 benchmark results.
This commit is contained in:
Martín Lucas Golini
2026-07-10 19:51:05 -03:00
parent d29dbb1cc1
commit 660d64c823
4 changed files with 55 additions and 7 deletions
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21
src/tests/unit_tests/uihtml_tests.cpp
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@@ -2914,6 +2914,27 @@ UTEST( UIHTML, HashedSelectorMatchingAndClassMutation ) {
Engine::destroySingleton();
}
UTEST( UIHTML, SingleRuleSelectorMatching ) {
Engine::instance()->createWindow( WindowSettings( 1024, 768, "Single Rule Selector Test",
WindowStyle::Default, WindowBackend::Default,
32, {}, 1, false, true ),
ContextSettings( false, 0, 0, GLv_default, true, false ) );
UISceneNode* sceneNode = init_test_inline_block();
sceneNode->loadLayoutFromString( HTMLFormatter::HTMLtoXML(
R"html(<html><body><div id="target" class="foo bar"></div></body></html>)html" ) );
auto* target = sceneNode->getRoot()->find( "target" )->asType<UIWidget>();
ASSERT_TRUE( target != nullptr );
EXPECT_TRUE( StyleSheetSelector( ".foo" ).select( target, false ) );
EXPECT_TRUE( StyleSheetSelector( "#target" ).select( target, false ) );
EXPECT_TRUE( StyleSheetSelector( "div.foo" ).select( target, false ) );
EXPECT_TRUE( StyleSheetSelector( ".foo:hover" ).select( target, false ) );
EXPECT_FALSE( StyleSheetSelector( ".foo:hover" ).select( target, true ) );
Engine::destroySingleton();
}
UTEST( UIHTML, ClassIndexedStyleSheetCandidates ) {
Engine::instance()->createWindow( WindowSettings( 1024, 768, "Class Index Test",
WindowStyle::Default, WindowBackend::Default,