visitRuleSet method

@override void visitRuleSet(RuleSet node)

Implementation

@override
void visitRuleSet(RuleSet node) {
  final oldParent = _parentRuleSet;

  var oldNestedSelectorGroups = _nestedSelectorGroup;

  if (_nestedSelectorGroup == null) {
    // Create top-level selector (may have nested rules).
    final newSelectors = node.selectorGroup!.selectors.toList();
    _topLevelSelectorGroup = SelectorGroup(newSelectors, node.span);
    _nestedSelectorGroup = _topLevelSelectorGroup;
  } else {
    // Generate new selector groups from the nested rules.
    _nestedSelectorGroup = _mergeToFlatten(node);
  }

  _parentRuleSet = node;

  super.visitRuleSet(node);

  _parentRuleSet = oldParent;

  // Remove nested rules; they're all flatten and in the _expandedRuleSets.
  node.declarationGroup.declarations
      .removeWhere((declaration) => declaration is RuleSet);

  _nestedSelectorGroup = oldNestedSelectorGroups;

  // If any expandedRuleSets and we're back at the top-level rule set then
  // there were nested rule set(s).
  if (_parentRuleSet == null) {
    if (_expandedRuleSets.isNotEmpty) {
      // Remember ruleset to replace with these flattened rulesets.
      _expansions[node] = _expandedRuleSets;
      _expandedRuleSets = [];
    }
    assert(_flatDeclarationGroup == null);
    assert(_nestedSelectorGroup == null);
  }
}