90 lines
2.8 KiB
Python
90 lines
2.8 KiB
Python
import unittest
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from calc.lexer import tokenize, Token, LexError
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def kinds(tokens):
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return [t.kind for t in tokens]
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def vals(tokens):
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return [t.value for t in tokens]
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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(kinds(toks), ['NUMBER', 'EOF'])
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self.assertEqual(toks[0].value, 42)
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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(kinds(toks), ['NUMBER', 'EOF'])
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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_float_leading_dot(self):
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toks = tokenize(".5")
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self.assertEqual(kinds(toks), ['NUMBER', 'EOF'])
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self.assertAlmostEqual(toks[0].value, 0.5)
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def test_float_trailing_dot(self):
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toks = tokenize("10.")
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self.assertEqual(kinds(toks), ['NUMBER', 'EOF'])
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self.assertAlmostEqual(toks[0].value, 10.0)
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class TestOperatorsAndParens(unittest.TestCase):
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def test_operators(self):
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toks = tokenize("1+2*3")
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self.assertEqual(kinds(toks), ['NUMBER', 'PLUS', 'NUMBER', 'STAR', 'NUMBER', 'EOF'])
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def test_all_operators(self):
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toks = tokenize("+-*/")
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self.assertEqual(kinds(toks), ['PLUS', 'MINUS', 'STAR', 'SLASH', 'EOF'])
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def test_parens(self):
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toks = tokenize("()")
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self.assertEqual(kinds(toks), ['LPAREN', 'RPAREN', 'EOF'])
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def test_complex_expr(self):
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toks = tokenize("3.5*(1-2)")
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self.assertEqual(kinds(toks), ['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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class TestWhitespaceAndErrors(unittest.TestCase):
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def test_whitespace_skipped(self):
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toks = tokenize(" 12 + 3 ")
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self.assertEqual(kinds(toks), ['NUMBER', 'PLUS', 'NUMBER', 'EOF'])
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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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toks = tokenize("1\t+\t2")
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self.assertEqual(kinds(toks), ['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_invalid_position_in_message(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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if __name__ == '__main__':
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unittest.main()
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