def test_fails_to_parse_non_ll1(self):
e = self.assertSimpleParseFailure(
combinators.choice(
combinators.sequence(primitives.match(lambda c: c == "h"),
primitives.match(lambda c: c == "a")),
combinators.sequence(primitives.match(lambda c: c == "b"),
primitives.match(lambda c: c == "e"))),
"hello")
self.assertEqual("e", e.value)
self.assertEqual(list("llo"), list(e.it))
self.assertEqual(set(), e.expected)
def test_fails_to_parse_second(self):
e = self.assertSimpleParseFailure(
combinators.sequence(primitives.any_, primitives.error({"error!"})),
"hello")
self.assertEqual("e", e.value)
self.assertEqual(list("llo"), list(e.it))
self.assertEqual({"error!"}, e.expected)
def test_fails_to_parse_ll2(self):
e = self.assertParseFailure(
combinators.try_(combinators.sequence(
primitives.any_, primitives.any_,
primitives.error({"error!"}))),
"test")
self.assertEqual({"error!"}, e.expected)
def literal(s):
"""Parse a predefined literal.
Args:
s: The literal to parse.
Returns:
The parsing function.
"""
@combinators.mapf(combinators.sequence(*[char(c) for c in s]))
def _action(cs):
return "".join(cs)
return combinators.choice(combinators.suppress_expect(_action),
primitives.error([s]))
def __add__(self, rhs):
return Parser(combinators.sequence(self, rhs))
def test_fails_to_parse(self):
e = self.assertParseFailure(
combinators.sequence(primitives.error({"error!"}), primitives.any_),
"hello")
self.assertEqual({"error!"}, e.expected)
def test_parses(self):
self.assertParse(
combinators.sequence(primitives.any_, primitives.any_),
["h", "e"], "llo", "hello")
def test_parses_non_ll1(self):
self.assertParse(
combinators.not_followed_by(combinators.sequence(
primitives.match(lambda c: c == "h"),
primitives.match(lambda c: c == "e"))),
None, "hllo", "hllo")