private string ConsumeSubQuery()
{
StringBuilder sq = new StringBuilder();
while (!_tq.IsEmpty)
{
if (_tq.Matches("("))
{
sq.Append("(").Append(_tq.ChompBalanced('(', ')')).Append(")");
}
else if (_tq.Matches("["))
{
sq.Append("[").Append(_tq.ChompBalanced('[', ']')).Append("]");
}
else if (_tq.MatchesAny(combinators))
{
break;
}
else
{
sq.Append(_tq.Consume());
}
}
return(sq.ToString());
}