119 lines
3.6 KiB
Python
119 lines
3.6 KiB
Python
import unittest
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from calc.lexer import tokenize, Token, LexError
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class TestNumbers(unittest.TestCase):
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def test_integer(self):
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result = tokenize("42")
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self.assertEqual(result, [Token('NUMBER', 42), Token('EOF', None)])
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self.assertIsInstance(result[0].value, int)
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def test_float_standard(self):
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result = tokenize("3.14")
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self.assertEqual(result[0].kind, 'NUMBER')
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self.assertAlmostEqual(result[0].value, 3.14)
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self.assertIsInstance(result[0].value, float)
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def test_float_leading_dot(self):
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result = tokenize(".5")
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self.assertEqual(result[0].kind, 'NUMBER')
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self.assertAlmostEqual(result[0].value, 0.5)
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self.assertIsInstance(result[0].value, float)
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def test_float_trailing_dot(self):
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result = tokenize("10.")
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self.assertEqual(result[0].kind, 'NUMBER')
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self.assertAlmostEqual(result[0].value, 10.0)
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self.assertIsInstance(result[0].value, float)
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def test_eof_is_last(self):
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result = tokenize("42")
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self.assertEqual(result[-1].kind, 'EOF')
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class TestOperatorsAndParens(unittest.TestCase):
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def _kinds(self, src):
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return [t.kind for t in tokenize(src)]
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def test_plus(self):
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self.assertEqual(self._kinds("+"), ['PLUS', 'EOF'])
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def test_minus(self):
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self.assertEqual(self._kinds("-"), ['MINUS', 'EOF'])
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def test_star(self):
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self.assertEqual(self._kinds("*"), ['STAR', 'EOF'])
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def test_slash(self):
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self.assertEqual(self._kinds("/"), ['SLASH', 'EOF'])
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def test_lparen(self):
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self.assertEqual(self._kinds("("), ['LPAREN', 'EOF'])
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def test_rparen(self):
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self.assertEqual(self._kinds(")"), ['RPAREN', 'EOF'])
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def test_expression_1_plus_2_star_3(self):
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self.assertEqual(
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self._kinds("1+2*3"),
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['NUMBER', 'PLUS', 'NUMBER', 'STAR', 'NUMBER', 'EOF'],
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)
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class TestWhitespaceAndErrors(unittest.TestCase):
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def _kinds(self, src):
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return [t.kind for t in tokenize(src)]
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def test_whitespace_around_tokens(self):
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result = tokenize(" 12 + 3 ")
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self.assertEqual(
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[t.kind for t in result],
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['NUMBER', 'PLUS', 'NUMBER', 'EOF'],
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)
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nums = [t.value for t in result if t.kind == 'NUMBER']
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self.assertEqual(nums, [12, 3])
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def test_complex_expression(self):
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result = tokenize("3.5*(1-2)")
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self.assertEqual(
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[t.kind for t in result],
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['NUMBER', 'STAR', 'LPAREN', 'NUMBER', 'MINUS', 'NUMBER', 'RPAREN', 'EOF'],
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)
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self.assertAlmostEqual(result[0].value, 3.5)
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self.assertEqual(result[3].value, 1)
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self.assertEqual(result[5].value, 2)
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def test_lex_error_at_sign(self):
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with self.assertRaises(LexError):
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tokenize("1 @ 2")
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def test_lex_error_dollar(self):
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with self.assertRaises(LexError):
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tokenize("$")
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def test_lex_error_letter(self):
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with self.assertRaises(LexError):
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tokenize("x + 1")
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def test_lex_error_message_contains_char(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_lex_error_message_contains_position(self):
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with self.assertRaises(LexError) as ctx:
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tokenize("1 @ 2")
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# '@' is at position 2
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self.assertIn('2', str(ctx.exception))
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def test_tab_whitespace(self):
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result = tokenize("1\t+\t2")
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self.assertEqual(
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[t.kind for t in result],
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['NUMBER', 'PLUS', 'NUMBER', 'EOF'],
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)
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if __name__ == '__main__':
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unittest.main()
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