def add_mod(self, seq, mod):
"""Create a tree.{Complement, LookAhead, Neg, Until}"""
modstr = self.value(mod)
if modstr == '~':
seq.parser_tree = parsing.Complement(seq.parser_tree)
elif modstr == '!!':
seq.parser_tree = parsing.LookAhead(seq.parser_tree)
elif modstr == '!':
seq.parser_tree = parsing.Neg(seq.parser_tree)
elif modstr == '->':
seq.parser_tree = parsing.Until(seq.parser_tree)
return True
def test_19_Until(self):
"""
Basic test for until ->R
"""
parser = parsing.Parser()
parser.parsed_stream("==|=|==tutu")
parseTree = parsing.Seq(
parsing.Until(parsing.Call(parsing.Parser.read_text, '|==')),
parsing.Call(parsing.Parser.read_text, 'tutu'),
)
res = parseTree(parser)
self.assertEqual(res, True, "failed to get the correct final value")