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Optimize stylesheet matching with class-based indexing:

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Index class-anchored selectors by one mandatory class hash so widgets
  only evaluate rules associated with their own classes instead of
  scanning every class-only rule in the global bucket.

  Preserve selector correctness by validating the complete rule after
  candidate lookup, and retain stylesheet source order across independent
  index buckets for equal-specificity cascade resolution.

  Update index clearing, copying, marker removal, and style insertion
  paths. Add focused candidate coverage and a legacy full-scan benchmark,
  showing a 63% lookup-time reduction on a class-heavy stylesheet.
This commit is contained in:
Martín Lucas Golini
2026-07-10 19:31:15 -03:00
parent 3e29da6a2e
commit d29dbb1cc1
9 changed files with 201 additions and 10 deletions
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34
src/tests/unit_tests/uihtml_tests.cpp
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@@ -2914,6 +2914,40 @@ UTEST( UIHTML, HashedSelectorMatchingAndClassMutation ) {
Engine::destroySingleton();
}
UTEST( UIHTML, ClassIndexedStyleSheetCandidates ) {
Engine::instance()->createWindow( WindowSettings( 1024, 768, "Class Index 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 );
StyleSheetParser parser;
ASSERT_TRUE( parser.loadFromString( std::string_view( R"css(
* { color: white; }
div { background-color: black; }
.foo { width: 10px; }
.foo.bar { height: 20px; }
div.foo { min-width: 5px; }
#target.foo { max-width: 50px; }
.unrelated { opacity: 0.5; }
)css" ) ) );
auto definition = parser.getStyleSheet().getElementStyles( target, false );
ASSERT_TRUE( definition != nullptr );
EXPECT_EQ( 6u, definition->getStyles().size() );
EXPECT_TRUE( std::none_of( definition->getStyles().begin(), definition->getStyles().end(),
[]( const StyleSheetStyle* style ) {
return style->getSelector().getName() == ".unrelated";
} ) );
Engine::destroySingleton();
}
UTEST( UIHTML, BlockList ) {
Engine::instance()->createWindow( WindowSettings( 1024, 768, "Block List Test",
WindowStyle::Default, WindowBackend::Default,