def test_invalid_token_parser(text: str, parser: Parser):
stream = CharStream(text)
production = parser.parse(stream)
assert str(production) == ''
assert not production
def test_valid_not_parser(text, parser):
parser = NotCharParser(parser)
stream = CharStream(text)
produce = parser.parse(stream)
assert str(produce) == ''
assert produce
def test_valid_onemany_parser(text: str, parser: Parser):
parser = OneManyParser(parser)
stream = CharStream(text)
production = parser.parse(stream)
assert str(production) == text
assert production
def test_valid_token_parser(text: str, parser: Parser):
stream = CharStream(text)
production = parser.parse(stream)
assert text.startswith(str(production))
assert production
def test_invalid_seq_parser_returns_nothing(text, parsers):
parser = SeqParser(*parsers)
stream = CharStream(text)
production = parser.parse(stream)
assert str(production) == ''
assert not production
def test_valid_zeromany_parser(text, parser):
parser = ZeroManyParser(parser)
stream = CharStream(text)
production = parser.parse(stream)
assert str(production) == text
assert production
def test_is_next_char():
stream = CharStream('a3')
assert stream.get(0).value == 'a'
assert not stream.get(1).value == 'C'
assert stream.get(1).value == '3'
def test_stream_length():
stream = CharStream('abc')
assert len(stream) == 3
def test_empty_text_is_eof():
stream = CharStream()
assert stream.get().is_eof()
def test_char_values():
text = 'i76hj-'
stream = CharStream(text)
values = ''.join([stream.get(i).value for i, _ in enumerate(text)])
assert values == text
def test_char_column():
text = 'ab\nc\n\nd'
stream = CharStream(text)
lines = [stream.get(i).column for i, _ in enumerate(text)]
assert lines == [0, 1, 2, 0, 1, 0, 0]
def test_char_line():
text = 'ab\nc\n\nd'
stream = CharStream(text)
lines = [stream.get(i).line for i, _ in enumerate(text)]
assert lines == [0, 0, 0, 1, 1, 2, 3]
def test_char_type(test_input, method):
stream = CharStream(test_input)
ch = stream.get()
assert getattr(ch, method)()
def test_valid_one_of_parser(text, parsers):
parser = OneOfParser(*parsers)
stream = CharStream(text)
production = parser.parse(stream)
assert str(production) == text
assert production
def test_valid_seq_parser(text, parsers):
parser = SeqParser(*parsers)
stream = CharStream(text)
production = parser.parse(stream)
assert str(production) == text
assert production
def test_valid_optional_parser(text, parser):
parser = OptionalParser(parser)
stream = CharStream(text)
assert parser.parse(stream)
def test_empty_text_has_zero_length():
stream = CharStream()
assert len(stream) == 0