91 lines
2.6 KiB
Python
91 lines
2.6 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 values(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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tokens = tokenize("42")
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self.assertEqual(tokens[0], Token('NUMBER', 42))
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self.assertEqual(tokens[0].value, 42)
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self.assertIsInstance(tokens[0].value, int)
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self.assertEqual(tokens[1].kind, 'EOF')
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def test_float(self):
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t = tokenize("3.14")
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self.assertEqual(t[0].kind, 'NUMBER')
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self.assertAlmostEqual(t[0].value, 3.14)
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self.assertIsInstance(t[0].value, float)
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def test_leading_dot(self):
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t = tokenize(".5")
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self.assertEqual(t[0].kind, 'NUMBER')
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self.assertAlmostEqual(t[0].value, 0.5)
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def test_trailing_dot(self):
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t = tokenize("10.")
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self.assertEqual(t[0].kind, 'NUMBER')
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self.assertAlmostEqual(t[0].value, 10.0)
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self.assertIsInstance(t[0].value, float)
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class TestOperatorsAndParens(unittest.TestCase):
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def test_1plus2star3(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_all_operators(self):
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self.assertEqual(kinds("+-*/()"),
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['PLUS', 'MINUS', 'STAR', 'SLASH', 'LPAREN', 'RPAREN', 'EOF'])
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class TestWhitespaceAndErrors(unittest.TestCase):
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def test_spaces_skipped(self):
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self.assertEqual(kinds(" 12 + 3 "),
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['NUMBER', 'PLUS', 'NUMBER', 'EOF'])
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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_complex_expression(self):
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result = values("3.5*(1-2)")
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self.assertEqual(result, [
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('NUMBER', 3.5),
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('STAR', '*'),
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('LPAREN', '('),
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('NUMBER', 1),
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('MINUS', '-'),
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('NUMBER', 2),
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('RPAREN', ')'),
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('EOF', None),
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])
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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("$10")
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def test_invalid_letter_raises(self):
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with self.assertRaises(LexError):
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tokenize("abc")
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def test_error_message_includes_position(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))
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if __name__ == '__main__':
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unittest.main()
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