def test_alternatives(self):
self.assert_graphs(
build(Alternatives()), """digraph {
0 [label="NoMatch"]
1 [label="Match"]
0 -> 1
}""")
self.assert_graphs(
build(Alternatives([Sequence([n(1), n(2), n(3)])])), """digraph {
0 [label="1"]
1 [label="2"]
2 [label="3"]
3 [label="Match"]
0 -> 1
1 -> 2
2 -> 3
}""")
self.assert_graphs(
build(
Alternatives([
Sequence([n(1), n(2), n(3)]),
Sequence([n(4), n(5)]),
Sequence()
])), """digraph {
0 [label="...|..."]
1 [label="1"]
2 [label="4"]
3 [label="Match"]
4 [label="5"]
5 [label="2"]
6 [label="3"]
0 -> 1
0 -> 2
0 -> 3
2 -> 4
4 -> 3
1 -> 5
5 -> 6
6 -> 3
}""")
def callback(self, yes_no, terminal):
'''Callback used by `yesNoBuilder` to accumulate data.'''
# first callback - have 'yes', possibly terminated by '|'
if self.__yes is None:
(self.__yes, yes_no) = (yes_no, None)
# collect second alternative
if terminal == '|':
return YesNoBuilder(self, self._parser_state, self.__parent,
')')
# final callback - build yes and no (if present)
yes = self.__yes.to_sequence()
no = yes_no.to_sequence() if yes_no else Sequence()
label = ('...' if yes else '') + ('|...' if no else '')
if not label:
label = '|'
split = lambda label: Conditional(self.__name, label)
alternatives = Alternatives([no, yes], label=label, split=split)
self.__parent._sequence.append(alternatives)
return self.__parent
def __init__(self, parser_state):
super(SequenceBuilder, self).__init__(parser_state)
self._alternatives = Alternatives()
self._sequence = Sequence()
