37 lines
1.1 KiB
Python
37 lines
1.1 KiB
Python
import codecs
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import locale
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import re
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import sys
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from typing import List, Tuple
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BOMS: List[Tuple[bytes, str]] = [
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(codecs.BOM_UTF8, "utf-8"),
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(codecs.BOM_UTF16, "utf-16"),
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(codecs.BOM_UTF16_BE, "utf-16-be"),
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(codecs.BOM_UTF16_LE, "utf-16-le"),
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(codecs.BOM_UTF32, "utf-32"),
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(codecs.BOM_UTF32_BE, "utf-32-be"),
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(codecs.BOM_UTF32_LE, "utf-32-le"),
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]
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ENCODING_RE = re.compile(br"coding[:=]\s*([-\w.]+)")
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def auto_decode(data: bytes) -> str:
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"""Check a bytes string for a BOM to correctly detect the encoding
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Fallback to locale.getpreferredencoding(False) like open() on Python3"""
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for bom, encoding in BOMS:
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if data.startswith(bom):
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return data[len(bom) :].decode(encoding)
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# Lets check the first two lines as in PEP263
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for line in data.split(b"\n")[:2]:
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if line[0:1] == b"#" and ENCODING_RE.search(line):
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result = ENCODING_RE.search(line)
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assert result is not None
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encoding = result.groups()[0].decode("ascii")
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return data.decode(encoding)
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return data.decode(
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locale.getpreferredencoding(False) or sys.getdefaultencoding(),
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)
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