92 lines
2.9 KiB
Python
92 lines
2.9 KiB
Python
import unittest
|
|
from calc.lexer import tokenize, Token, LexError
|
|
|
|
|
|
def kinds(src):
|
|
return [t.kind for t in tokenize(src)]
|
|
|
|
|
|
def values(src):
|
|
return [(t.kind, t.value) for t in tokenize(src)]
|
|
|
|
|
|
class TestNumbers(unittest.TestCase):
|
|
def test_integer(self):
|
|
toks = tokenize("42")
|
|
self.assertEqual(len(toks), 2)
|
|
self.assertEqual(toks[0].kind, 'NUMBER')
|
|
self.assertEqual(toks[0].value, 42)
|
|
self.assertIsInstance(toks[0].value, int)
|
|
self.assertEqual(toks[1].kind, 'EOF')
|
|
|
|
def test_float_standard(self):
|
|
toks = tokenize("3.14")
|
|
self.assertEqual(toks[0].kind, 'NUMBER')
|
|
self.assertAlmostEqual(toks[0].value, 3.14)
|
|
self.assertIsInstance(toks[0].value, float)
|
|
|
|
def test_float_leading_dot(self):
|
|
toks = tokenize(".5")
|
|
self.assertEqual(toks[0].kind, 'NUMBER')
|
|
self.assertAlmostEqual(toks[0].value, 0.5)
|
|
self.assertIsInstance(toks[0].value, float)
|
|
|
|
def test_float_trailing_dot(self):
|
|
toks = tokenize("10.")
|
|
self.assertEqual(toks[0].kind, 'NUMBER')
|
|
self.assertAlmostEqual(toks[0].value, 10.0)
|
|
self.assertIsInstance(toks[0].value, float)
|
|
|
|
|
|
class TestOperatorsAndParens(unittest.TestCase):
|
|
def test_all_operators(self):
|
|
self.assertEqual(kinds("+-*/()"), ['PLUS', 'MINUS', 'STAR', 'SLASH', 'LPAREN', 'RPAREN', 'EOF'])
|
|
|
|
def test_expression(self):
|
|
self.assertEqual(kinds("1+2*3"), ['NUMBER', 'PLUS', 'NUMBER', 'STAR', 'NUMBER', 'EOF'])
|
|
|
|
def test_operator_values(self):
|
|
toks = tokenize("+")
|
|
self.assertEqual(toks[0].value, '+')
|
|
|
|
def test_parens_values(self):
|
|
toks = tokenize("()")
|
|
self.assertEqual(toks[0].kind, 'LPAREN')
|
|
self.assertEqual(toks[0].value, '(')
|
|
self.assertEqual(toks[1].kind, 'RPAREN')
|
|
self.assertEqual(toks[1].value, ')')
|
|
|
|
|
|
class TestWhitespaceAndErrors(unittest.TestCase):
|
|
def test_spaces_skipped(self):
|
|
self.assertEqual(kinds(" 12 + 3 "), ['NUMBER', 'PLUS', 'NUMBER', 'EOF'])
|
|
|
|
def test_tabs_skipped(self):
|
|
self.assertEqual(kinds("1\t+\t2"), ['NUMBER', 'PLUS', 'NUMBER', 'EOF'])
|
|
|
|
def test_complex_expression(self):
|
|
self.assertEqual(kinds("3.5*(1-2)"), ['NUMBER', 'STAR', 'LPAREN', 'NUMBER', 'MINUS', 'NUMBER', 'RPAREN', 'EOF'])
|
|
|
|
def test_at_sign_raises(self):
|
|
with self.assertRaises(LexError) as ctx:
|
|
tokenize("1 @ 2")
|
|
self.assertIn('@', str(ctx.exception))
|
|
|
|
def test_dollar_raises(self):
|
|
with self.assertRaises(LexError):
|
|
tokenize("$5")
|
|
|
|
def test_letter_raises(self):
|
|
with self.assertRaises(LexError):
|
|
tokenize("x")
|
|
|
|
def test_error_position_in_message(self):
|
|
with self.assertRaises(LexError) as ctx:
|
|
tokenize("1 @ 2")
|
|
msg = str(ctx.exception)
|
|
self.assertIn('2', msg) # position 2
|
|
|
|
|
|
if __name__ == '__main__':
|
|
unittest.main()
|