Python Grammar.init_min_length Exemples

Exemple #1

Fichier : test_unger.py Projet : CyberZHG/parse-toys

 def test_case_4(self):
     grammar = Grammar()
     grammar.init_min_length()
     grammar.parse("""
         S -> A B
         A -> a b
         B -> c
     """)
     result = parse_with_unger(grammar, 'abc')
     self.assertEqual(result, ('A B', ('a b', 'a', 'b'), ('c', 'c')))

Exemple #2

    def test_grammar_min_length(self):
        grammar = Grammar()
        grammar.parse("""
Number -> Integer | Real
Integer -> Digit | Integer Digit
Real -> Integer Fraction Scale
Fraction -> . Integer
Scale -> e Sign Integer | Empty
Digit -> 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
Sign -> + | -
Empty -> ε
        """)
        grammar.init_min_length()
        self.assertEqual(0, grammar.symbols['Scale'].min_length)
        self.assertEqual(1, grammar.symbols['Number'].min_length)
        self.assertEqual(2, grammar.symbols['Fraction'].min_length)
        self.assertEqual(3, grammar.symbols['Real'].min_length)