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- # The following comment should be removed at some point in the future.
- # mypy: strict-optional=False
- import codecs
- import locale
- import re
- import sys
- from pip._internal.utils.typing import MYPY_CHECK_RUNNING
- if MYPY_CHECK_RUNNING:
- from typing import List, Tuple, Text
- BOMS = [
- (codecs.BOM_UTF8, 'utf-8'),
- (codecs.BOM_UTF16, 'utf-16'),
- (codecs.BOM_UTF16_BE, 'utf-16-be'),
- (codecs.BOM_UTF16_LE, 'utf-16-le'),
- (codecs.BOM_UTF32, 'utf-32'),
- (codecs.BOM_UTF32_BE, 'utf-32-be'),
- (codecs.BOM_UTF32_LE, 'utf-32-le'),
- ] # type: List[Tuple[bytes, Text]]
- ENCODING_RE = re.compile(br'coding[:=]\s*([-\w.]+)')
- def auto_decode(data):
- # type: (bytes) -> Text
- """Check a bytes string for a BOM to correctly detect the encoding
- Fallback to locale.getpreferredencoding(False) like open() on Python3"""
- for bom, encoding in BOMS:
- if data.startswith(bom):
- return data[len(bom):].decode(encoding)
- # Lets check the first two lines as in PEP263
- for line in data.split(b'\n')[:2]:
- if line[0:1] == b'#' and ENCODING_RE.search(line):
- encoding = ENCODING_RE.search(line).groups()[0].decode('ascii')
- return data.decode(encoding)
- return data.decode(
- locale.getpreferredencoding(False) or sys.getdefaultencoding(),
- )
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