def test_optional_greedy(self):
""" Test greedy setting of optional parser class. """
input = "abc"
p = parser.Sequence([
parser.Sequence([
parser.String("a"),
parser.Optional(parser.String("b"), greedy=False)
]),
parser.Sequence(
[parser.Optional(parser.String("b")),
parser.String("c")]),
])
expected_output_1 = [["a", None], ["b", "c"]]
expected_output_2 = [["a", "b"], [None, "c"]]
state = parser.State(input)
print "Parser:", p
print "State:", state
generator = p.parse(state)
generator.next()
root = state.build_parse_tree()
self.assertEqual(root.value(), expected_output_1)
print "Output 1:", expected_output_1
generator.next()
root = state.build_parse_tree()
self.assertEqual(root.value(), expected_output_2)
print "Output 2:", expected_output_2
def initialize(self):
self._element_identifier = _ElementRef()
self._action_identifier = _ActionRef()
alternatives = parser_.Alternative((
_Literal(),
_Optional(),
_Group(),
self._element_identifier,
))
elements = [
parser_.Whitespace(optional=True),
alternatives,
parser_.Optional(
parser_.Sequence((
parser_.Whitespace(optional=True),
self._action_identifier,
))),
parser_.Whitespace(optional=True),
]
parser_.Sequence.__init__(self, elements)