105 lines
3.2 KiB
Python
105 lines
3.2 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_mul_over_add(self):
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# 1+2*3 → 1+(2*3)
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self.assertEqual(repr(p('1+2*3')),
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'BinOp(PLUS, Num(1), BinOp(STAR, Num(2), Num(3)))')
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def test_div_over_sub(self):
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# 6-4/2 → 6-(4/2)
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self.assertEqual(repr(p('6-4/2')),
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'BinOp(MINUS, Num(6), BinOp(SLASH, Num(4), Num(2)))')
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def test_mul_over_add_reversed(self):
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# 2*3+1 → (2*3)+1
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self.assertEqual(repr(p('2*3+1')),
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'BinOp(PLUS, BinOp(STAR, Num(2), Num(3)), Num(1))')
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class TestLeftAssociativity(unittest.TestCase):
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def test_subtraction_left(self):
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# 8-3-2 → (8-3)-2
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self.assertEqual(repr(p('8-3-2')),
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'BinOp(MINUS, BinOp(MINUS, Num(8), Num(3)), Num(2))')
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def test_division_left(self):
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# 8/4/2 → (8/4)/2
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self.assertEqual(repr(p('8/4/2')),
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'BinOp(SLASH, BinOp(SLASH, Num(8), Num(4)), Num(2))')
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def test_addition_left(self):
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# 1+2+3 → (1+2)+3
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self.assertEqual(repr(p('1+2+3')),
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'BinOp(PLUS, BinOp(PLUS, Num(1), Num(2)), Num(3))')
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def test_mul_left(self):
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# 2*3*4 → (2*3)*4
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self.assertEqual(repr(p('2*3*4')),
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'BinOp(STAR, BinOp(STAR, Num(2), Num(3)), Num(4))')
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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 → STAR at top, PLUS inside
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self.assertEqual(repr(p('(1+2)*3')),
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'BinOp(STAR, BinOp(PLUS, Num(1), Num(2)), Num(3))')
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def test_parens_on_right(self):
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# 3*(1+2)
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self.assertEqual(repr(p('3*(1+2)')),
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'BinOp(STAR, Num(3), BinOp(PLUS, Num(1), Num(2)))')
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def test_nested_parens(self):
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self.assertEqual(repr(p('((2))')), 'Num(2)')
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class TestUnaryMinus(unittest.TestCase):
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def test_leading_unary(self):
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self.assertEqual(repr(p('-5')), 'Unary(MINUS, Num(5))')
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def test_unary_paren(self):
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self.assertEqual(repr(p('-(1+2)')),
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'Unary(MINUS, BinOp(PLUS, Num(1), Num(2)))')
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def test_unary_in_mul(self):
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self.assertEqual(repr(p('3 * -2')),
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'BinOp(STAR, Num(3), Unary(MINUS, Num(2)))')
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def test_double_unary(self):
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self.assertEqual(repr(p('--5')),
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'Unary(MINUS, Unary(MINUS, Num(5)))')
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class TestErrors(unittest.TestCase):
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def test_trailing_operator(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_two_consecutive_numbers(self):
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with self.assertRaises(ParseError):
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p('1 2')
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def test_close_open_paren(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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