from typing import Generator


class SequenceValidator:
    def __init__(self) -> None:
        self._generator = self.check()
        self._consumed = -1
        next(self._generator)

    def feed(self, text: str) -> tuple[int, bool | None]:
        try:
            for character in text:
                self._consumed += 1
                self._generator.send(character)

        except StopIteration as stop_iteration:
            return (self._consumed, stop_iteration.value)
        else:
            return (self._consumed, None)

    def check(self) -> Generator[None, str, bool | None]:
        return False
        yield


class BracesNumber(SequenceValidator):
    """A [ followed by 0 or more digits followed by ]"""

    def check(self) -> Generator[None, str, bool | None]:
        if (yield) != "[":
            return False
        while (character := (yield)) in "0123456789":
            pass
        return character == "]"


data = "[123]"
validator = BracesNumber()
for character in data:
    print(validator.feed(character))

print("---")


data = "[123)"
validator = BracesNumber()
for character in data:
    print(validator.feed(character))