def test_with_name(self):
grammar = '\n'.join([
'import base.bnf', '', 'Grammar: MySpecialGrammar', '',
'<A> ::= "SPECIAL"'
])
tree = Parser().parse(grammar)
name = next(tree.filter(Node.is_name))
self.assertEqual(
name.value,
'MySpecialGrammar',
)
py_repr = tree.to_python()
self.assertTrue('class MySpecialGrammar' in py_repr)
def test_removes_unreachable_symbols(self):
grammar = r'''
start: <head>
<head> ::= <a> <b>
<a> ::= "-" | ε
<b> ::= <a> <d>
<d> ::= "1"
<c> ::= "Q"
'''
tree = Parser().parse(grammar)
Translator().translate(tree)
for node in tree.filter(lambda x: x.value == 'c'):
self.fail('Expected unused expressions to be removed.')