91 lines
2.9 KiB
Python
91 lines
2.9 KiB
Python
import unittest
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from calc.lexer import tokenize, Token, LexError
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def kinds(src):
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return [t.kind for t in tokenize(src)]
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def pairs(src):
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return [(t.kind, t.value) for t in tokenize(src)]
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class TestNumbers(unittest.TestCase):
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def test_integer(self):
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toks = tokenize("42")
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self.assertEqual(toks, [Token('NUMBER', 42), Token('EOF', None)])
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self.assertIsInstance(toks[0].value, int)
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def test_float(self):
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toks = tokenize("3.14")
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self.assertEqual(toks[0], Token('NUMBER', 3.14))
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self.assertIsInstance(toks[0].value, float)
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def test_leading_dot(self):
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toks = tokenize(".5")
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self.assertAlmostEqual(toks[0].value, 0.5)
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def test_trailing_dot(self):
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toks = tokenize("10.")
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self.assertEqual(toks[0].value, 10.0)
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self.assertIsInstance(toks[0].value, float)
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class TestOperatorsAndParens(unittest.TestCase):
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def test_all_operators(self):
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self.assertEqual(kinds("+"), ['PLUS', 'EOF'])
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self.assertEqual(kinds("-"), ['MINUS', 'EOF'])
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self.assertEqual(kinds("*"), ['STAR', 'EOF'])
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self.assertEqual(kinds("/"), ['SLASH', 'EOF'])
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self.assertEqual(kinds("("), ['LPAREN', 'EOF'])
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self.assertEqual(kinds(")"), ['RPAREN', 'EOF'])
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def test_expression_1_plus_2_star_3(self):
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self.assertEqual(kinds("1+2*3"),
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['NUMBER', 'PLUS', 'NUMBER', 'STAR', 'NUMBER', 'EOF'])
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def test_expression_3_5_times_paren(self):
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self.assertEqual(kinds("3.5*(1-2)"),
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['NUMBER', 'STAR', 'LPAREN', 'NUMBER', 'MINUS', 'NUMBER', 'RPAREN', 'EOF'])
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class TestWhitespaceAndErrors(unittest.TestCase):
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def test_whitespace_between_tokens(self):
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toks = tokenize(" 12 + 3 ")
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self.assertEqual([(t.kind, t.value) for t in toks],
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[('NUMBER', 12), ('PLUS', '+'), ('NUMBER', 3), ('EOF', None)])
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def test_tabs_skipped(self):
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self.assertEqual(kinds("1\t+\t2"), ['NUMBER', 'PLUS', 'NUMBER', 'EOF'])
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def test_invalid_at_raises(self):
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with self.assertRaises(LexError) as ctx:
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tokenize("1 @ 2")
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self.assertIn('@', str(ctx.exception))
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def test_invalid_dollar_raises(self):
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with self.assertRaises(LexError):
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tokenize("$")
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def test_invalid_letter_raises(self):
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with self.assertRaises(LexError):
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tokenize("x")
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def test_error_position_reported(self):
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with self.assertRaises(LexError) as ctx:
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tokenize("1 @ 2")
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self.assertIn('2', str(ctx.exception)) # position 2
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def test_complex_expression(self):
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toks = tokenize("3.5*(1-2)")
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expected = [
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('NUMBER', 3.5), ('STAR', '*'), ('LPAREN', '('),
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('NUMBER', 1), ('MINUS', '-'), ('NUMBER', 2),
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('RPAREN', ')'), ('EOF', None),
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]
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self.assertEqual([(t.kind, t.value) for t in toks], expected)
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if __name__ == '__main__':
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unittest.main()
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