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import sys
import unicodedata
from configparser import RawConfigParser
from .compat import py39
from .warnings import SetuptoolsDeprecationWarning
# HFS Plus uses decomposed UTF-8
def decompose(path):
if isinstance(path, str):
return unicodedata.normalize('NFD', path)
try:
path = path.decode('utf-8')
path = unicodedata.normalize('NFD', path)
path = path.encode('utf-8')
except UnicodeError:
pass # Not UTF-8
return path
def filesys_decode(path):
"""
Ensure that the given path is decoded,
``None`` when no expected encoding works
"""
if isinstance(path, str):
return path
fs_enc = sys.getfilesystemencoding() or 'utf-8'
candidates = fs_enc, 'utf-8'
for enc in candidates:
try:
return path.decode(enc)
except UnicodeDecodeError:
continue
return None
def try_encode(string, enc):
"turn unicode encoding into a functional routine"
try:
return string.encode(enc)
except UnicodeEncodeError:
return None
def _read_utf8_with_fallback(file: str, fallback_encoding=py39.LOCALE_ENCODING) -> str:
"""
First try to read the file with UTF-8, if there is an error fallback to a
different encoding ("locale" by default). Returns the content of the file.
Also useful when reading files that might have been produced by an older version of
setuptools.
"""
try:
with open(file, "r", encoding="utf-8") as f:
return f.read()
except UnicodeDecodeError: # pragma: no cover
_Utf8EncodingNeeded.emit(file=file, fallback_encoding=fallback_encoding)
with open(file, "r", encoding=fallback_encoding) as f:
return f.read()
def _cfg_read_utf8_with_fallback(
cfg: RawConfigParser, file: str, fallback_encoding=py39.LOCALE_ENCODING
) -> None:
"""Same idea as :func:`_read_utf8_with_fallback`, but for the
:meth:`RawConfigParser.read` method.
This method may call ``cfg.clear()``.
"""
try:
cfg.read(file, encoding="utf-8")
except UnicodeDecodeError: # pragma: no cover
_Utf8EncodingNeeded.emit(file=file, fallback_encoding=fallback_encoding)
cfg.clear()
cfg.read(file, encoding=fallback_encoding)
class _Utf8EncodingNeeded(SetuptoolsDeprecationWarning):
_SUMMARY = """
`encoding="utf-8"` fails with {file!r}, trying `encoding={fallback_encoding!r}`.
"""
_DETAILS = """
Fallback behavior for UTF-8 is considered **deprecated** and future versions of
`setuptools` may not implement it.
Please encode {file!r} with "utf-8" to ensure future builds will succeed.
If this file was produced by `setuptools` itself, cleaning up the cached files
and re-building/re-installing the package with a newer version of `setuptools`
(e.g. by updating `build-system.requires` in its `pyproject.toml`)
might solve the problem.
"""
# TODO: Add a deadline?
# Will we be able to remove this?
# The question comes to mind mainly because of sdists that have been produced
# by old versions of setuptools and published to PyPI...