visitDeclarationGroup method

@override void visitDeclarationGroup(DeclarationGroup node)

Implementation

@override
void visitDeclarationGroup(DeclarationGroup node) {
  var span = node.span;

  var currentGroup = DeclarationGroup([], span);

  var oldGroup = _flatDeclarationGroup;
  _flatDeclarationGroup = currentGroup;

  var expandedLength = _expandedRuleSets.length;

  super.visitDeclarationGroup(node);

  // We're done with the group.
  _flatDeclarationGroup = oldGroup;

  // No nested rule to process it's a top-level rule.
  if (_nestedSelectorGroup == _topLevelSelectorGroup) return;

  // If flatten selector's declaration is empty skip this selector, no need
  // to emit an empty nested selector.
  if (currentGroup.declarations.isEmpty) return;

  var selectorGroup = _nestedSelectorGroup;

  // Build new rule set from the nested selectors and declarations.
  var newRuleSet = RuleSet(selectorGroup, currentGroup, span);

  // Place in order so outer-most rule is first.
  if (expandedLength == _expandedRuleSets.length) {
    _expandedRuleSets.add(newRuleSet);
  } else {
    _expandedRuleSets.insert(expandedLength, newRuleSet);
  }
}