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66 lines
2.0 KiB
66 lines
2.0 KiB
import abc
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from typing import Dict, Iterable, Optional
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class PassthroughException(Exception):
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"""Raised when the processor would like the file to pass through unchanged."""
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class ProcessorException(Exception): # pragma: no cover
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"""A base exception class to be used by processor objects."""
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class Processor(abc.ABC): # pragma: no cover
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def __init__(self, *args, **kwargs):
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"""Initialize the class."""
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@abc.abstractmethod
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def filename(self, oldname: str, ctx: Optional[Dict] = None) -> str:
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"""Return the filename of the post-processed file.
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Arguments:
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oldname (str): the previous name for the file.
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ctx (dict, optional): A context object generated from the processor configuration
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Returns:
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str: the new name for the file
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"""
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@abc.abstractmethod
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def mime_type(self, oldname: str, ctx: Optional[Dict] = None) -> str:
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"""Return the mimetype of the post-processed file.
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Arguments:
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oldname (str): the input filename
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ctx (dict, optional): A context object generated from the processor configuration
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Returns:
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str: the new mimetype of the file after processing
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"""
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@abc.abstractmethod
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def extension(self, oldname: str, ctx: Optional[Dict] = None) -> str:
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"""Return the mimetype of the post-processed file.
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Arguments:
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oldname (str): the input filename
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ctx (dict, optional): A context object generated from the processor configuration
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Returns:
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str: the new extension of the file after processing
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"""
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@abc.abstractmethod
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def process(self, input_file: Iterable, ctx: Optional[Dict] = None) -> Iterable:
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"""Return an iterable object of the post-processed file.
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Arguments:
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input_file (iterable): An input stream
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ctx (dict, optional): A context object generated from the processor configuration
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Returns:
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iterable: The post-processed output stream
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"""
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