87 lines
2.8 KiB
Python
87 lines
2.8 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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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, [Token('NUMBER', 42), Token('EOF', None)])
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def test_float(self):
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tokens = tokenize("3.14")
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self.assertEqual(tokens[0].kind, 'NUMBER')
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self.assertAlmostEqual(tokens[0].value, 3.14)
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self.assertEqual(tokens[1].kind, 'EOF')
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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_each_operator(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_kinds(self):
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self.assertEqual(kinds("1+2*3"), ['NUMBER', 'PLUS', 'NUMBER', 'STAR', 'NUMBER', 'EOF'])
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class TestWhitespace(unittest.TestCase):
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def test_spaces(self):
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tokens = tokenize(" 12 + 3 ")
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self.assertEqual([t.kind for t in tokens], ['NUMBER', 'PLUS', 'NUMBER', 'EOF'])
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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_tabs(self):
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tokens = tokenize("1\t+\t2")
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self.assertEqual([t.kind for t in tokens], ['NUMBER', 'PLUS', 'NUMBER', 'EOF'])
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class TestErrors(unittest.TestCase):
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def test_at_sign_raises_lex_error(self):
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with self.assertRaises(LexError) as ctx:
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tokenize("1 @ 2")
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msg = str(ctx.exception)
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self.assertIn('@', msg)
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self.assertIn('2', msg) # position 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("abc")
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class TestComplex(unittest.TestCase):
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def test_float_expr_with_parens(self):
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tokens = tokenize("3.5*(1-2)")
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self.assertEqual(
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[t.kind for t in tokens],
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['NUMBER', 'STAR', 'LPAREN', 'NUMBER', 'MINUS', 'NUMBER', 'RPAREN', 'EOF']
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)
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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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