98 lines
3.1 KiB
Python
98 lines
3.1 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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toks = tokenize("42")
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self.assertEqual(toks[0], Token('NUMBER', 42))
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self.assertIsInstance(toks[0].value, int)
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self.assertEqual(toks[1].kind, 'EOF')
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def test_float(self):
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toks = tokenize("3.14")
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self.assertAlmostEqual(toks[0].value, 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.assertAlmostEqual(toks[0].value, 10.0)
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self.assertIsInstance(toks[0].value, float)
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def test_tokenize_42_eof(self):
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toks = tokenize("42")
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self.assertEqual(kinds("42"), ['NUMBER', 'EOF'])
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self.assertEqual(toks[0].value, 42)
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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(self):
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self.assertEqual(kinds("1+2*3"), ['NUMBER', 'PLUS', 'NUMBER', 'STAR', 'NUMBER', 'EOF'])
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def test_complex_expression(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_skipped(self):
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self.assertEqual(kinds(" 12 + 3 "), ['NUMBER', 'PLUS', 'NUMBER', 'EOF'])
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toks = tokenize(" 12 + 3 ")
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self.assertEqual(toks[0].value, 12)
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self.assertEqual(toks[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_at_raises_lex_error(self):
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with self.assertRaises(LexError):
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tokenize("1 @ 2")
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def test_dollar_raises_lex_error(self):
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with self.assertRaises(LexError):
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tokenize("$")
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def test_letter_raises_lex_error(self):
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with self.assertRaises(LexError):
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tokenize("x")
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def test_lex_error_message(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_complex_with_parens(self):
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toks = tokenize("3.5*(1-2)")
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kinds_list = [t.kind for t in toks]
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self.assertEqual(kinds_list,
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['NUMBER', 'STAR', 'LPAREN', 'NUMBER', 'MINUS', 'NUMBER', 'RPAREN', 'EOF'])
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self.assertAlmostEqual(toks[0].value, 3.5)
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self.assertEqual(toks[3].value, 1)
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self.assertEqual(toks[5].value, 2)
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if __name__ == '__main__':
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unittest.main()
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