def test_fig_16(self):
i_grammar = FunctionIndexedGrammar([self.functions[x] for x in [0, 19]],
[["b", "a"]])
self.assertFalse(i_grammar.is_empty())
i_grammar.update([["a", "b"]])
self.assertTrue(i_grammar.is_empty())
def test_mif_10(self):
i_grammar = FunctionIndexedGrammar(
[self.functions[x] for x in [2, 3, 4, 5]], [["b"]])
self.assertFalse(i_grammar.is_empty())
i_grammar.update([["b"]])
self.assertFalse(i_grammar.is_empty())
i_grammar.update([["c"]])
self.assertFalse(i_grammar.is_empty())
i_grammar.update([["e"]])
self.assertTrue(i_grammar.is_empty())
