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import abc
import os
from typing import Set, Dict
assert Set # make pyflakes happy
class AbstractParser(abc.ABC):
""" This is the base class of every parser.
It might yield `ValueError` on instantiation on invalid files.
"""
meta_list = set() # type: Set[str]
mimetypes = set() # type: Set[str]
def __init__(self, filename: str) -> None:
"""
:raises ValueError: Raised upon an invalid file
"""
self.filename = filename
fname, extension = os.path.splitext(filename)
self.output_filename = fname + '.cleaned' + extension
@abc.abstractmethod
def get_meta(self) -> Dict[str, str]:
pass # pragma: no cover
@abc.abstractmethod
def remove_all(self) -> bool:
pass # pragma: no cover
def remove_all_lightweight(self) -> bool:
""" This method removes _SOME_ metadata.
It might be useful to implement it for fileformats that do
not support non-destructive cleaning.
"""
return self.remove_all()
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