Method positive_lookahead

Tools/peg_generator/pegen/parser.py:280–284

(self, func: Callable[..., T], *args: object)

        return res

    def positive_lookahead(self, func: Callable[..., T], *args: object) -> T:
        mark = self._mark()
        ok = func(*args)
        self._reset(mark)
        return ok

    def negative_lookahead(self, func: Callable[..., object], *args: object) -> bool:
        mark = self._mark()