126 lines
3.6 KiB
Python
126 lines
3.6 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 tok(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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result = tokenize("42")
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self.assertEqual(result, [Token('NUMBER', 42), Token('EOF', None)])
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def test_float(self):
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result = tokenize("3.14")
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self.assertEqual(len(result), 2)
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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.assertEqual(result[1].kind, 'EOF')
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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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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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def test_number_value_is_int_for_integer(self):
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result = tokenize("42")
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self.assertIsInstance(result[0].value, int)
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def test_number_value_is_float_for_float(self):
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result = tokenize("3.14")
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self.assertIsInstance(result[0].value, float)
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class TestOperatorsAndParens(unittest.TestCase):
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def test_plus(self):
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self.assertIn(('PLUS', '+'), tok("+"))
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def test_minus(self):
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self.assertIn(('MINUS', '-'), tok("-"))
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def test_star(self):
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self.assertIn(('STAR', '*'), tok("*"))
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def test_slash(self):
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self.assertIn(('SLASH', '/'), tok("/"))
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def test_lparen(self):
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self.assertIn(('LPAREN', '('), tok("("))
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def test_rparen(self):
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self.assertIn(('RPAREN', ')'), tok(")"))
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def test_expression_kinds(self):
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self.assertEqual(
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kinds("1+2*3"),
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['NUMBER', 'PLUS', 'NUMBER', 'STAR', 'NUMBER', 'EOF']
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)
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def test_complex_expression(self):
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self.assertEqual(
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kinds("3.5*(1-2)"),
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['NUMBER', 'STAR', 'LPAREN', 'NUMBER', 'MINUS', 'NUMBER', 'RPAREN', 'EOF']
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)
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class TestWhitespaceAndErrors(unittest.TestCase):
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def test_whitespace_skipped(self):
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self.assertEqual(
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kinds(" 12 + 3 "),
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['NUMBER', 'PLUS', 'NUMBER', 'EOF']
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)
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def test_whitespace_values(self):
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tokens = tokenize(" 12 + 3 ")
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self.assertEqual(tokens[0].value, 12)
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self.assertEqual(tokens[2].value, 3)
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def test_tab_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):
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tokenize("1 @ 2")
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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("a")
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def test_lexerror_message_contains_char(self):
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try:
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tokenize("1 @ 2")
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self.fail("Expected LexError")
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except LexError as e:
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self.assertIn('@', str(e))
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def test_lexerror_message_contains_position(self):
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try:
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tokenize("1 @ 2")
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self.fail("Expected LexError")
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except LexError as e:
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self.assertIn('2', str(e))
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def test_complex_with_parens_values(self):
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tokens = tokenize("3.5*(1-2)")
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self.assertAlmostEqual(tokens[0].value, 3.5)
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self.assertEqual(tokens[3].value, 1)
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self.assertEqual(tokens[5].value, 2)
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if __name__ == '__main__':
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unittest.main()
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