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import glob
import os
import mimetypes
import importlib
from typing import TypeVar, Optional, List, Tuple
from . import abstract, UNSUPPORTED_EXTENSIONS
T = TypeVar('T', bound='abstract.AbstractParser')
mimetypes.add_type('application/epub+zip', '.epub')
mimetypes.add_type('application/x-dtbncx+xml', '.ncx') # EPUB Navigation Control XML File
# This should be removed after we move to python3.10
# https://github.com/python/cpython/commit/20a5b7e986377bdfd929d7e8c4e3db5847dfdb2d
mimetypes.add_type('image/heic', '.heic')
def __load_all_parsers():
""" Loads every parser in a dynamic way """
current_dir = os.path.dirname(__file__)
for fname in glob.glob(os.path.join(current_dir, '*.py')):
if fname.endswith('abstract.py'):
continue
elif fname.endswith('__init__.py'):
continue
elif fname.endswith('exiftool.py'):
continue
basename = os.path.basename(fname)
name, _ = os.path.splitext(basename)
importlib.import_module('.' + name, package='libmat2')
__load_all_parsers()
def _get_parsers() -> List[T]:
""" Get all our parsers!"""
def __get_parsers(cls):
return cls.__subclasses__() + \
[g for s in cls.__subclasses__() for g in __get_parsers(s)]
return __get_parsers(abstract.AbstractParser)
def get_parser(filename: str) -> Tuple[Optional[T], Optional[str]]:
""" Return the appropriate parser for a given filename.
:raises ValueError: Raised if the instantiation of the parser went wrong.
"""
mtype, _ = mimetypes.guess_type(filename)
_, extension = os.path.splitext(filename)
if extension.lower() in UNSUPPORTED_EXTENSIONS:
return None, mtype
if mtype == 'application/x-tar':
if extension[1:] in ('bz2', 'gz', 'xz'):
mtype = mtype + '+' + extension[1:]
for parser_class in _get_parsers(): # type: ignore
if mtype in parser_class.mimetypes:
# This instantiation might raise a ValueError on malformed files
return parser_class(filename), mtype
return None, mtype
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