def cleanup_sequence(rule, lst):
if len(lst) == 1: return lst[0]
return parsetree.Sequence(rule, *tuple(lst))
def cleanup_choice(rule, lst):
if len(lst) == 0: return parsetree.Sequence(rule, [])
if len(lst) == 1: return lst[0]
return parsetree.Choice(rule, *tuple(lst))