98 lines
2.8 KiB
Python
98 lines
2.8 KiB
Python
import unittest
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from calc.lexer import tokenize
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from calc.parser import parse, ParseError, Num, BinOp, Unary
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def p(src):
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return parse(tokenize(src))
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class TestPrecedence(unittest.TestCase):
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def test_add_mul(self):
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# 1+2*3 must parse as 1+(2*3), not (1+2)*3
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self.assertEqual(p('1+2*3'), BinOp('+', Num(1), BinOp('*', Num(2), Num(3))))
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def test_div_add(self):
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# 6/2+1 must parse as (6/2)+1
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self.assertEqual(p('6/2+1'), BinOp('+', BinOp('/', Num(6), Num(2)), Num(1)))
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def test_mul_sub(self):
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# 4-2*3 => 4-(2*3)
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self.assertEqual(p('4-2*3'), BinOp('-', Num(4), BinOp('*', Num(2), Num(3))))
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class TestLeftAssoc(unittest.TestCase):
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def test_subtraction(self):
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# 8-3-2 => (8-3)-2
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self.assertEqual(p('8-3-2'), BinOp('-', BinOp('-', Num(8), Num(3)), Num(2)))
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def test_division(self):
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# 8/4/2 => (8/4)/2
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self.assertEqual(p('8/4/2'), BinOp('/', BinOp('/', Num(8), Num(4)), Num(2)))
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def test_addition(self):
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# 1+2+3 => (1+2)+3
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self.assertEqual(p('1+2+3'), BinOp('+', BinOp('+', Num(1), Num(2)), Num(3)))
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class TestParentheses(unittest.TestCase):
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def test_parens_override_precedence(self):
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# (1+2)*3 => BinOp('*', BinOp('+', Num(1), Num(2)), Num(3))
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self.assertEqual(
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p('(1+2)*3'),
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BinOp('*', BinOp('+', Num(1), Num(2)), Num(3))
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)
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def test_nested_parens(self):
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self.assertEqual(p('((5))'), Num(5))
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def test_parens_in_add(self):
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# 2*(3+4) => BinOp('*', Num(2), BinOp('+', Num(3), Num(4)))
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self.assertEqual(
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p('2*(3+4)'),
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BinOp('*', Num(2), BinOp('+', Num(3), Num(4)))
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)
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class TestUnaryMinus(unittest.TestCase):
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def test_simple(self):
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self.assertEqual(p('-5'), Unary('-', Num(5)))
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def test_paren(self):
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# -(1+2) => Unary('-', BinOp('+', Num(1), Num(2)))
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self.assertEqual(p('-(1+2)'), Unary('-', BinOp('+', Num(1), Num(2))))
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def test_after_mul(self):
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# 3 * -2 => BinOp('*', Num(3), Unary('-', Num(2)))
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self.assertEqual(p('3 * -2'), BinOp('*', Num(3), Unary('-', Num(2))))
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def test_double_unary(self):
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# --5 => Unary('-', Unary('-', Num(5)))
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self.assertEqual(p('--5'), Unary('-', Unary('-', Num(5))))
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class TestErrors(unittest.TestCase):
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def test_trailing_op(self):
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with self.assertRaises(ParseError):
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p('1 +')
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def test_unclosed_paren(self):
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with self.assertRaises(ParseError):
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p('(1')
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def test_extra_number(self):
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with self.assertRaises(ParseError):
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p('1 2')
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def test_close_before_open(self):
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with self.assertRaises(ParseError):
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p(')(')
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def test_empty_string(self):
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with self.assertRaises(ParseError):
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p('')
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if __name__ == '__main__':
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unittest.main()
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