mirror of
https://github.com/morpheus65535/bazarr
synced 2024-12-29 02:55:52 +00:00
94 lines
3.1 KiB
Python
94 lines
3.1 KiB
Python
# coding: utf-8
|
|
r"""
|
|
Give Python the ability to decode some common, flawed encodings.
|
|
|
|
Python does not want you to be sloppy with your text. Its encoders and decoders
|
|
("codecs") follow the relevant standards whenever possible, which means that
|
|
when you get text that *doesn't* follow those standards, you'll probably fail
|
|
to decode it. Or you might succeed at decoding it for implementation-specific
|
|
reasons, which is perhaps worse.
|
|
|
|
There are some encodings out there that Python wishes didn't exist, which are
|
|
widely used outside of Python:
|
|
|
|
- "utf-8-variants", a family of not-quite-UTF-8 encodings, including the
|
|
ever-popular CESU-8 and "Java modified UTF-8".
|
|
- "Sloppy" versions of character map encodings, where bytes that don't map to
|
|
anything will instead map to the Unicode character with the same number.
|
|
|
|
Simply importing this module, or in fact any part of the `ftfy` package, will
|
|
make these new "bad codecs" available to Python through the standard Codecs
|
|
API. You never have to actually call any functions inside `ftfy.bad_codecs`.
|
|
|
|
However, if you want to call something because your code checker insists on it,
|
|
you can call ``ftfy.bad_codecs.ok()``.
|
|
|
|
A quick example of decoding text that's encoded in CESU-8:
|
|
|
|
>>> import ftfy.bad_codecs
|
|
>>> print(b'\xed\xa0\xbd\xed\xb8\x8d'.decode('utf-8-variants'))
|
|
😍
|
|
"""
|
|
from __future__ import unicode_literals
|
|
from encodings import normalize_encoding
|
|
import codecs
|
|
|
|
_CACHE = {}
|
|
|
|
# Define some aliases for 'utf-8-variants'. All hyphens get turned into
|
|
# underscores, because of `normalize_encoding`.
|
|
UTF8_VAR_NAMES = (
|
|
'utf_8_variants', 'utf8_variants',
|
|
'utf_8_variant', 'utf8_variant',
|
|
'utf_8_var', 'utf8_var',
|
|
'cesu_8', 'cesu8',
|
|
'java_utf_8', 'java_utf8'
|
|
)
|
|
|
|
|
|
def search_function(encoding):
|
|
"""
|
|
Register our "bad codecs" with Python's codecs API. This involves adding
|
|
a search function that takes in an encoding name, and returns a codec
|
|
for that encoding if it knows one, or None if it doesn't.
|
|
|
|
The encodings this will match are:
|
|
|
|
- Encodings of the form 'sloppy-windows-NNNN' or 'sloppy-iso-8859-N',
|
|
where the non-sloppy version is an encoding that leaves some bytes
|
|
unmapped to characters.
|
|
- The 'utf-8-variants' encoding, which has the several aliases seen
|
|
above.
|
|
"""
|
|
if encoding in _CACHE:
|
|
return _CACHE[encoding]
|
|
|
|
norm_encoding = normalize_encoding(encoding)
|
|
codec = None
|
|
if norm_encoding in UTF8_VAR_NAMES:
|
|
from ftfy.bad_codecs.utf8_variants import CODEC_INFO
|
|
codec = CODEC_INFO
|
|
elif norm_encoding.startswith('sloppy_'):
|
|
from ftfy.bad_codecs.sloppy import CODECS
|
|
codec = CODECS.get(norm_encoding)
|
|
|
|
if codec is not None:
|
|
_CACHE[encoding] = codec
|
|
|
|
return codec
|
|
|
|
|
|
def ok():
|
|
"""
|
|
A feel-good function that gives you something to call after importing
|
|
this package.
|
|
|
|
Why is this here? Pyflakes. Pyflakes gets upset when you import a module
|
|
and appear not to use it. It doesn't know that you're using it when
|
|
you use the ``unicode.encode`` and ``bytes.decode`` methods with certain
|
|
encodings.
|
|
"""
|
|
pass
|
|
|
|
|
|
codecs.register(search_function)
|