private Boolean FillRules(CssGroupingRule group) { var token = NextToken(); CollectTrivia(ref token); while (token.IsNot(CssTokenType.EndOfFile, CssTokenType.CurlyBracketClose)) { var rule = CreateRule(group.Owner, token); token = NextToken(); CollectTrivia(ref token); if (rule != null) { group.Add(rule); } } return(token.Type == CssTokenType.CurlyBracketClose); }