def __init__(
self,
grammar: grammar.Grammar,
file: Optional[IO[Text]],
*,
tokens: Dict[int, str] = token.tok_name,
skip_actions: bool = False,
):
keywords = grammar.metas.get("keywords")
self.use_reserved_words = self.parse_bool(keywords, "keywords", True)
if skip_actions and ("start" not in grammar.rules
and "trailer" not in grammar.metas):
first_rule = next(iter(grammar.rules))
grammar.rules["start"] = Rule(
"start", None,
Rhs([Alt([NamedItem(None, NameLeaf(first_rule))])]))
super().__init__(grammar, tokens, file)
self.skip_actions = skip_actions
self.callmakervisitor: PythonCallMakerVisitor = PythonCallMakerVisitor(
self)
mark = self.mark()
cut = False
if ((grammar := self.grammar())
and (endmarker_ := self.expect('ENDMARKER'))):
return grammar
self.reset(mark)
if cut: return None
return None
@memoize
def grammar(self) -> Optional[Grammar]:
# grammar: metas rules | rules
mark = self.mark()
cut = False
if ((metas := self.metas()) and (rules := self.rules())):
return Grammar(rules, metas)
self.reset(mark)
if cut: return None
cut = False
if ((rules := self.rules())):
return Grammar(rules, [])
self.reset(mark)
if cut: return None
return None
@memoize
def metas(self) -> Optional[MetaList]:
# metas: meta metas | meta
mark = self.mark()
cut = False
if ((meta := self.meta()) and (metas := self.metas())):