def name_gather(self, node: Gather) -> str:
self.counter += 1
name = f"_gather_{self.counter}"
self.counter += 1
extra_function_name = f"_loop0_{self.counter}"
extra_function_alt = Alt(
[
NamedItem(None, node.separator),
NamedItem("elem", node.node),
],
action="elem",
)
self.todo[extra_function_name] = Rule(
extra_function_name,
None,
Rhs([extra_function_alt]),
)
alt = Alt([
NamedItem("elem", node.node),
NamedItem("seq", NameLeaf(extra_function_name)),
], )
self.todo[name] = Rule(
name,
None,
Rhs([alt]),
)
return name
def name_loop(self, node: Plain, is_repeat1: bool) -> str:
self.counter += 1
if is_repeat1:
prefix = '_loop1_'
else:
prefix = '_loop0_'
name = f'{prefix}{self.counter}' # TODO: It's ugly to signal via the name.
self.todo[name] = Rule(name, None, Rhs([Alt([NamedItem(None, node)])]))
return name
def artificial_rule_from_repeat(self, node: Plain,
is_repeat1: bool) -> str:
self.counter += 1
if is_repeat1:
prefix = "_loop1_"
else:
prefix = "_loop0_"
name = f"{prefix}{self.counter}"
self.all_rules[name] = Rule(name, None,
Rhs([Alt([NamedItem(None, node)])]))
return name
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)
cut = False
if ((literal := self.expect("|")) and (alts := self.alts())
and (newline_ := self.expect('NEWLINE'))):
return Rhs(alts.alts)
self.reset(mark)
if cut: return None
return None
@memoize
def alt(self) -> Optional[Alt]:
# alt: items '$' action | items '$' | items action | items
mark = self.mark()
cut = False
if ((items := self.items()) and (literal := self.expect('$'))
and (action := self.action())):
return Alt(items + [NamedItem(None, NameLeaf('ENDMARKER'))],
action=action)
self.reset(mark)
if cut: return None
cut = False
if ((items := self.items()) and (literal := self.expect('$'))):
return Alt(items + [NamedItem(None, NameLeaf('ENDMARKER'))],
action=None)
self.reset(mark)
if cut: return None
cut = False
if ((items := self.items()) and (action := self.action())):
return Alt(items, action=action)
self.reset(mark)
if cut: return None
cut = False
if ((items := self.items())):