Increments the parser by n characters
        if the end of the input has not been reached.

def inc_n(self, n, exception=None):  # type: (int, Exception) -> bool
        """
        Increments the parser by n characters
        if the end of the input has not been reached.
        """
        for _ in range(n):
            if not self.inc(exception=exception):
                return False

        return True