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//lib/python2.7/dist-packages/setuptools/unicode_utils.py

import unicodedata
import sys
import re

from setuptools.extern import six

# HFS Plus uses decomposed UTF-8
def decompose(path):
    if isinstance(path, six.text_type):
        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, six.text_type):
        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

def try_encode(string, enc):
    "turn unicode encoding into a functional routine"
    try:
        return string.encode(enc)
    except UnicodeEncodeError:
        return None

CODING_RE = re.compile(br'^[ \t\f]*#.*?coding[:=][ \t]*([-\w.]+)')

def detect_encoding(fp):
    first_line = fp.readline()
    fp.seek(0)
    m = CODING_RE.match(first_line)
    if m is None:
        return None
    return m.group(1).decode('ascii')