Function contextual_wrapper

Tools/cases_generator/parsing.py:19–27

(self: P)

    # Decorator to wrap grammar methods.
    # Resets position if `func` returns None.
    def contextual_wrapper(self: P) -> N | None:
        begin = self.getpos()
        res = func(self)
        if res is None:
            self.setpos(begin)
            return None
        end = self.getpos()
        res.context = Context(begin, end, self)
        return res

    return contextual_wrapper