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import abc
import os
from typing import Set


class AbstractParser(abc.ABC):
    meta_list = set()  # type: Set[str]
    mimetypes = set()  # type: Set[str]

    def __init__(self, filename: str) -> None:
        self.filename = filename
        fname, extension = os.path.splitext(filename)
        self.output_filename = fname + '.cleaned' + extension

    @abc.abstractmethod
    def get_meta(self) -> dict:
        pass

    @abc.abstractmethod
    def remove_all(self) -> bool:
        pass

    def remove_all_lightweight(self) -> bool:
        """ Remove _SOME_ metadata. """
        return self.remove_all()