matchedPseudoRules method

Implementation

List<CSSStyleRule> matchedPseudoRules(RuleSet ruleSet, Element element) {

  final SelectorEvaluator evaluator = SelectorEvaluator();

  // Collect candidates from all indexed buckets because many pseudo-element
  // selectors (e.g., ".foo div::before") are indexed under tag/class/id
  // buckets for matching efficiency.
  final List<CSSRule> candidates = [];

  // #id
  String? id = element.id;
  if (id != null) {
    candidates.addAll(_collectMatchingRulesForList(
      ruleSet.idRules[id],
      element,
      evaluator: evaluator,
      includePseudo: true,
      enableAncestryFastPath: false,
    ));
  }

  // .class
  for (final String className in element.classList) {
    candidates.addAll(_collectMatchingRulesForList(
      ruleSet.classRules[className],
      element,
      evaluator: evaluator,
      includePseudo: true,
      enableAncestryFastPath: false,
    ));
  }

  // [attr]
  for (final String attribute in element.attributes.keys) {
    candidates.addAll(_collectMatchingRulesForList(
      ruleSet.attributeRules[attribute.toUpperCase()],
      element,
      evaluator: evaluator,
      includePseudo: true,
      enableAncestryFastPath: false,
    ));
  }

  // tag
  final String tagLookup = element.tagName.toUpperCase();
  candidates.addAll(_collectMatchingRulesForList(
    ruleSet.tagRules[tagLookup],
    element,
    evaluator: evaluator,
    includePseudo: true,
    enableAncestryFastPath: false,
  ));

  // universal
  candidates.addAll(_collectMatchingRulesForList(
    ruleSet.universalRules,
    element,
    evaluator: evaluator,
    includePseudo: true,
    enableAncestryFastPath: false,
  ));

  // legacy pseudo bucket (for selectors without a better rightmost key)
  candidates.addAll(_collectMatchingRulesForList(
    ruleSet.pseudoRules,
    element,
    evaluator: evaluator,
    includePseudo: true,
    enableAncestryFastPath: false,
  ));

  // Deduplicate while preserving order.
  final List<CSSStyleRule> list = [];
  final Set<CSSStyleRule> seen = {};
  for (final CSSRule r in candidates) {
    if (r is CSSStyleRule && !seen.contains(r)) {
      seen.add(r);
      list.add(r);
    }
  }


  return list;
}