133 lines
3.7 KiB
Python
133 lines
3.7 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 values(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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toks = tokenize("42")
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self.assertEqual(len(toks), 2)
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self.assertEqual(toks[0], Token('NUMBER', 42))
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self.assertEqual(toks[1], Token('EOF', None))
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def test_float(self):
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toks = tokenize("3.14")
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self.assertEqual(toks[0], Token('NUMBER', 3.14))
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self.assertEqual(toks[1], Token('EOF', None))
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def test_leading_dot(self):
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toks = tokenize(".5")
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self.assertEqual(toks[0], Token('NUMBER', 0.5))
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def test_trailing_dot(self):
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toks = tokenize("10.")
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self.assertEqual(toks[0], Token('NUMBER', 10.0))
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def test_integer_value_type(self):
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toks = tokenize("42")
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self.assertIsInstance(toks[0].value, int)
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def test_float_value_type(self):
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toks = tokenize("3.14")
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self.assertIsInstance(toks[0].value, float)
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class TestOperatorsAndParens(unittest.TestCase):
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def test_plus(self):
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self.assertIn(Token('PLUS', '+'), tokenize("+"))
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def test_minus(self):
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self.assertIn(Token('MINUS', '-'), tokenize("-"))
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def test_star(self):
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self.assertIn(Token('STAR', '*'), tokenize("*"))
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def test_slash(self):
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self.assertIn(Token('SLASH', '/'), tokenize("/"))
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def test_lparen(self):
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self.assertIn(Token('LPAREN', '('), tokenize("("))
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def test_rparen(self):
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self.assertIn(Token('RPAREN', ')'), tokenize(")"))
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def test_expression_kinds(self):
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self.assertEqual(
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kinds("1+2*3"),
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['NUMBER', 'PLUS', 'NUMBER', 'STAR', 'NUMBER', 'EOF'],
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)
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def test_complex_expression(self):
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self.assertEqual(
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kinds("3.5*(1-2)"),
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['NUMBER', 'STAR', 'LPAREN', 'NUMBER', 'MINUS', 'NUMBER', 'RPAREN', 'EOF'],
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)
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class TestWhitespaceAndErrors(unittest.TestCase):
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def test_spaces_between_tokens(self):
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self.assertEqual(
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kinds(" 12 + 3 "),
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['NUMBER', 'PLUS', 'NUMBER', 'EOF'],
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)
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def test_tabs_skipped(self):
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self.assertEqual(kinds("1\t+\t2"), ['NUMBER', 'PLUS', 'NUMBER', 'EOF'])
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def test_invalid_char_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_dollar_raises(self):
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with self.assertRaises(LexError):
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tokenize("$")
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def test_letter_raises(self):
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with self.assertRaises(LexError):
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tokenize("x")
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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)) # position 2
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class TestEndToEnd(unittest.TestCase):
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def test_padded_addition(self):
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v = values(" 12 + 3 ")
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self.assertEqual(v, [('NUMBER', 12), ('PLUS', '+'), ('NUMBER', 3), ('EOF', None)])
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def test_complex_with_values(self):
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v = values("3.5*(1-2)")
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self.assertEqual(v, [
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('NUMBER', 3.5),
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('STAR', '*'),
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('LPAREN', '('),
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('NUMBER', 1),
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('MINUS', '-'),
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('NUMBER', 2),
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('RPAREN', ')'),
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('EOF', None),
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])
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def test_eof_always_last(self):
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for src in ["", "1", "1+2", "()"]:
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toks = tokenize(src)
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self.assertEqual(toks[-1].kind, 'EOF')
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def test_empty_string(self):
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toks = tokenize("")
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self.assertEqual(toks, [Token('EOF', None)])
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if __name__ == '__main__':
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unittest.main()
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