def test_prio(self):
k_hi = Keyword('hi')
k_bye = Keyword('bye')
k_and = Keyword('and')
k_or = Keyword('or')
prio = Prio(
k_hi,
k_bye,
Sequence('(', THIS, ')'),
Sequence(THIS, k_and, THIS),
Sequence(THIS, k_or, THIS),
)
grammar = create_grammar(prio)
self.assertTrue(grammar.parse('hi').is_valid)
self.assertTrue(grammar.parse('(bye)').is_valid)
self.assertTrue(grammar.parse('(hi and bye)').is_valid)
self.assertTrue(grammar.parse('(hi or hi) and (hi or hi)').is_valid)
self.assertTrue(grammar.parse('(hi or (hi and bye))').is_valid)
self.assertFalse(grammar.parse('').is_valid)
self.assertFalse(grammar.parse('(hi').is_valid)
self.assertFalse(grammar.parse('()').is_valid)
self.assertFalse(grammar.parse('(hi or hi) and').is_valid)
with self.assertRaises(MaxRecursionError):
grammar.parse(
'(((((((((((((((((((((((((((((((((((((((((((((((((((hi'
')))))))))))))))))))))))))))))))))))))))))))))))))))')
def test_token(self):
dot = Token('.')
grammar = create_grammar(dot)
self.assertTrue(grammar.parse('.').is_valid)
self.assertFalse(grammar.parse('..').is_valid)
self.assertFalse(grammar.parse('').is_valid)
self.assertEqual(str(grammar.parse('')),
'error at position 0, expecting: .')
def test_keyword_ign_case(self):
k_hi = Keyword('hi', ign_case=True)
grammar = create_grammar(k_hi)
self.assertTrue(k_hi.ign_case)
self.assertTrue(grammar.parse('hi').is_valid)
self.assertTrue(grammar.parse('Hi').is_valid)
self.assertFalse(grammar.parse('hello').is_valid)
self.assertEqual('error at position 2, expecting: end_of_statement',
str(grammar.parse('Hi Iris')))
def test_sequence(self):
k_hi = Keyword('hi')
k_iris = Keyword('iris')
seq = Sequence(k_hi, k_iris)
grammar = create_grammar(seq)
self.assertTrue(grammar.parse('hi iris').is_valid)
self.assertFalse(grammar.parse(' hi sasha ').is_valid)
self.assertEqual(str(grammar.parse('hi sasha')),
'error at position 3, expecting: iris')
def test_choice_first_match(self):
k_hi = Keyword('hi')
k_iris = Keyword('iris')
seq = Sequence(k_hi, k_iris)
choice = Choice(k_hi, seq, most_greedy=False)
grammar = create_grammar(choice)
self.assertFalse(choice.most_greedy)
self.assertTrue(grammar.parse('hi').is_valid)
self.assertFalse(grammar.parse(' hi iris ').is_valid)
self.assertFalse(grammar.parse(' hi sasha ').is_valid)
def test_keyword(self):
k_hi = Keyword('hi')
grammar = create_grammar(k_hi)
self.assertFalse(k_hi.ign_case)
self.assertTrue(grammar.parse('hi').is_valid)
self.assertTrue(grammar.parse(' hi ').is_valid)
self.assertFalse(grammar.parse('Hi').is_valid)
self.assertFalse(grammar.parse('hello').is_valid)
self.assertEqual('error at position 0, expecting: hi',
str(grammar.parse('hello')))
self.assertEqual('parsed successfully', str(grammar.parse('hi')))
def test_ref(self):
ref = Ref()
k_hi = Keyword('HI')
ref = k_hi
grammar = create_grammar(ref)
self.assertTrue(grammar.parse('HI').is_valid)
self.assertFalse(grammar.parse('hi').is_valid)
self.assertFalse(grammar.parse('').is_valid)
self.assertEqual(
str(grammar.parse('ha')),
'error at position 0, expecting: HI',
)
def test_tokens(self):
spaced = '== != >= <= > <'
tokens = Tokens('== > != < >= <= ')
grammar = create_grammar(tokens)
self.assertEqual(spaced, str(tokens))
self.assertTrue(grammar.parse('==').is_valid)
self.assertTrue(grammar.parse('<=').is_valid)
self.assertTrue(grammar.parse('>').is_valid)
self.assertFalse(grammar.parse('').is_valid)
self.assertFalse(grammar.parse('=').is_valid)
self.assertEqual(str(grammar.parse('')),
'error at position 0, expecting: == != >= <= > <')
def test_regex(self):
regex = Regex('^(?:\'(?:[^\']*)\')+')
grammar = create_grammar(regex)
self.assertTrue(grammar.parse("'hi'").is_valid)
self.assertTrue(grammar.parse("'this is ''SiriDB'''").is_valid)
self.assertFalse(grammar.parse("'Hi !").is_valid)
self.assertFalse(grammar.parse("'hello''").is_valid)
self.assertFalse(grammar.parse("").is_valid)
self.assertEqual(
grammar.parse('hi.').as_str(
translate=lambda elem: 'single_quoted_string'
if elem is regex else None),
'error at position 0, expecting: single_quoted_string')
def test_list(self):
k_hi = Keyword('hi')
list_ = List(k_hi)
grammar = create_grammar(list_)
self.assertEqual(list_.min, 0)
self.assertEqual(list_.max, None)
self.assertFalse(list_.opt_closing)
self.assertTrue(grammar.parse('hi, hi, hi').is_valid)
self.assertTrue(grammar.parse('hi').is_valid)
self.assertTrue(grammar.parse('').is_valid)
self.assertFalse(grammar.parse('hi,').is_valid)
self.assertEqual(
str(grammar.parse('hi.')),
'error at position 2, expecting: , or end_of_statement')
def test_optional(self):
k_hi = Keyword('hi')
optional = Optional(k_hi)
grammar = create_grammar(optional)
self.assertTrue(grammar.parse('hi').is_valid)
self.assertTrue(grammar.parse('').is_valid)
self.assertFalse(grammar.parse('hello').is_valid)
self.assertEqual(
str(grammar.parse('hello')),
'error at position 0, expecting: end_of_statement or hi'
)
self.assertEqual(
str(grammar.parse('hi hi')),
'error at position 2, expecting: end_of_statement'
)
def test_repeat(self):
k_hi = Keyword('hi')
repeat = Repeat(k_hi)
grammar = create_grammar(repeat)
self.assertEqual(repeat.min, 0)
self.assertEqual(repeat.max, None)
self.assertTrue(grammar.parse('hi hi hi').is_valid)
self.assertTrue(grammar.parse('hi').is_valid)
self.assertTrue(grammar.parse('').is_valid)
self.assertFalse(grammar.parse('hihi').is_valid)
self.assertFalse(grammar.parse('ha,').is_valid)
self.assertEqual(
grammar.parse('hi.').as_str(),
'error at position 2, expecting: end_of_statement or hi')
self.assertEqual(
grammar.parse('hi.').as_str(translate=lambda elem: ''),
'error at position 2')
def test_repeat_all_options(self):
k_hi = Keyword('hi')
repeat = Repeat(k_hi, mi=1, ma=3)
grammar = create_grammar(repeat)
self.assertEqual(repeat.min, 1)
self.assertEqual(repeat.max, 3)
self.assertTrue(grammar.parse('hi hi hi').is_valid)
self.assertTrue(grammar.parse('hi').is_valid)
self.assertFalse(grammar.parse('').is_valid)
self.assertFalse(grammar.parse('hi hi hi hi').is_valid)
self.assertEqual(
grammar.parse('hi hi hi hi hi.').as_str(),
'error at position 8, expecting: end_of_statement')
self.assertEqual(
grammar.parse('hi.').as_str(),
'error at position 2, expecting: end_of_statement or hi')
self.assertEqual(
grammar.parse('').as_str(), 'error at position 0, expecting: hi')
def test_list_all_options(self):
k_hi = Keyword('hi')
list_ = List(k_hi, delimiter='-', mi=1, ma=3, opt=True)
grammar = create_grammar(list_)
self.assertEqual(list_.min, 1)
self.assertEqual(list_.max, 3)
self.assertTrue(list_.opt_closing)
self.assertTrue(grammar.parse('hi - hi - hi').is_valid)
self.assertTrue(grammar.parse('hi-hi-hi-').is_valid)
self.assertTrue(grammar.parse('hi-').is_valid)
self.assertTrue(grammar.parse('hi').is_valid)
self.assertFalse(grammar.parse('').is_valid)
self.assertFalse(grammar.parse('-').is_valid)
self.assertFalse(grammar.parse('hi-hi-hi-hi').is_valid)
self.assertEqual(str(grammar.parse('hi-hi-hi-hi-hi')),
'error at position 9, expecting: end_of_statement')
self.assertEqual(
str(grammar.parse('hi.')),
'error at position 2, expecting: - or end_of_statement')
self.assertEqual(str(grammar.parse('')),
'error at position 0, expecting: hi')
def test_keyword_alt_regkw(self):
grammar = create_grammar(Choice(Keyword('hi'), Token('HI')), r'[a-z]+')
self.assertTrue(grammar.parse('hi').is_valid)
self.assertTrue(grammar.parse('HI').is_valid)
self.assertFalse(grammar.parse('').is_valid)
self.assertFalse(grammar.parse('Hi').is_valid)