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projecten1/lib/python3.6/site-packages/pip/_internal/utils/encoding.py

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+import codecs
+import locale
+import re
+import sys
+
+BOMS = [
+    (codecs.BOM_UTF8, 'utf8'),
+    (codecs.BOM_UTF16, 'utf16'),
+    (codecs.BOM_UTF16_BE, 'utf16-be'),
+    (codecs.BOM_UTF16_LE, 'utf16-le'),
+    (codecs.BOM_UTF32, 'utf32'),
+    (codecs.BOM_UTF32_BE, 'utf32-be'),
+    (codecs.BOM_UTF32_LE, 'utf32-le'),
+]
+
+ENCODING_RE = re.compile(br'coding[:=]\s*([-\w.]+)')
+
+
+def auto_decode(data):
+    """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(),
+    )