def test_token_end_of_input(self):
lexer = roller.Lexer('a1')
self.assertEqual(lexer.advance(), roller.Token('STR', 'a'))
self.assertEqual(lexer.advance(), roller.Token('NUM', '1'))
self.assertEqual(lexer.advance(), roller.Token('EOI', None))
self.assertEqual(lexer.token(), roller.Token('EOI', None))
def test_str(self):
lexer = roller.Lexer('asdf')
self.assertEqual(lexer.advance(), roller.Token('STR', 'asdf'))
def test_initialized(self):
lexer = roller.Lexer('a+b')
self.assertEqual(lexer.advance(), roller.Token('STR', 'a'))
self.assertEqual(lexer.token(), roller.Token('STR', 'a'))
self.assertEqual(lexer.advance(), roller.Token('OP', '+'))
self.assertEqual(lexer.token(), roller.Token('OP', '+'))
def test_num(self):
lexer = roller.Lexer('123')
self.assertEqual(lexer.advance(), roller.Token('NUM', '123'))
def test_illegal_syntax(self):
lexer = roller.Lexer('foo(123)')
self.assertEqual(lexer.advance(), roller.Token('STR', 'foo'))
with self.assertRaises(Exception):
lexer.advance()
def test_token_uninitialized(self):
lexer = roller.Lexer('asdf')
self.assertEqual(lexer.token(), None)
def test_end_of_input(self):
lexer = roller.Lexer('5+6')
self.assertEqual(lexer.advance(), roller.Token('NUM', '5'))
self.assertEqual(lexer.advance(), roller.Token('OP', '+'))
self.assertEqual(lexer.advance(), roller.Token('NUM', '6'))
self.assertEqual(lexer.advance(), roller.Token('EOI', None))
def test_multiple_tokens(self):
lexer = roller.Lexer('123abc')
self.assertEqual(lexer.advance(), roller.Token('NUM', '123'))
self.assertEqual(lexer.advance(), roller.Token('STR', 'abc'))
def test_read_start(self):
lexer = roller.Lexer('-123')
self.assertEqual(lexer.advance(), roller.Token('OP', '-'))
def test_minus(self):
lexer = roller.Lexer('-')
self.assertEqual(lexer.advance(), roller.Token('OP', '-'))
def make_parser(input):
lexer = roller.Lexer(input)
return roller.Parser(lexer)