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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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