101 lines
3.1 KiB
Python
101 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 kind_value(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[1], Token('EOF', None))
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def test_float(self):
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tokens = tokenize("3.14")
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self.assertIsInstance(tokens[0].value, float)
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self.assertAlmostEqual(tokens[0].value, 3.14)
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def test_leading_dot(self):
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tokens = tokenize(".5")
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self.assertEqual(tokens[0].kind, 'NUMBER')
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self.assertAlmostEqual(tokens[0].value, 0.5)
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def test_trailing_dot(self):
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tokens = tokenize("10.")
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self.assertEqual(tokens[0].kind, 'NUMBER')
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self.assertAlmostEqual(tokens[0].value, 10.0)
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class TestOperatorsAndParens(unittest.TestCase):
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def test_single_ops(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_paren_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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def test_tab_whitespace(self):
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self.assertEqual(kinds("1\t+\t2"), ['NUMBER', 'PLUS', 'NUMBER', 'EOF'])
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def test_lex_error_at(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_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("abc")
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def test_lex_error_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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class TestSpecificExamples(unittest.TestCase):
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"""Exact examples from the DoD."""
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def test_dod_42(self):
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toks = tokenize("42")
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self.assertEqual(toks[0].kind, 'NUMBER')
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self.assertEqual(toks[0].value, 42)
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self.assertEqual(toks[1].kind, 'EOF')
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def test_dod_spaced(self):
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self.assertEqual(kinds(" 12 + 3 "), ['NUMBER', 'PLUS', 'NUMBER', 'EOF'])
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def test_dod_paren(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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def test_dod_lex_error(self):
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with self.assertRaises(LexError):
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tokenize("1 @ 2")
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if __name__ == '__main__':
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unittest.main()
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