+ bits = _asciire.split(string)
+ res = [bits[0]]
+ append = res.append
+ for i in range(1, len(bits), 2):
+ append(compat_urllib_parse_unquote_to_bytes(bits[i]).decode(encoding, errors))
+ append(bits[i + 1])
+ return ''.join(res)
+
+ def compat_urllib_parse_unquote_plus(string, encoding='utf-8', errors='replace'):
+ """Like unquote(), but also replace plus signs by spaces, as required for
+ unquoting HTML form values.
+
+ unquote_plus('%7e/abc+def') -> '~/abc def'
+ """
+ string = string.replace('+', ' ')
+ return compat_urllib_parse_unquote(string, encoding, errors)
+
+try:
+ from urllib.parse import urlencode as compat_urllib_parse_urlencode
+except ImportError: # Python 2
+ # Python 2 will choke in urlencode on mixture of byte and unicode strings.
+ # Possible solutions are to either port it from python 3 with all
+ # the friends or manually ensure input query contains only byte strings.
+ # We will stick with latter thus recursively encoding the whole query.
+ def compat_urllib_parse_urlencode(query, doseq=0, encoding='utf-8'):
+ def encode_elem(e):
+ if isinstance(e, dict):
+ e = encode_dict(e)
+ elif isinstance(e, (list, tuple,)):
+ list_e = encode_list(e)
+ e = tuple(list_e) if isinstance(e, tuple) else list_e
+ elif isinstance(e, compat_str):
+ e = e.encode(encoding)
+ return e
+
+ def encode_dict(d):
+ return dict((encode_elem(k), encode_elem(v)) for k, v in d.items())
+
+ def encode_list(l):
+ return [encode_elem(e) for e in l]
+
+ return compat_urllib_parse.urlencode(encode_elem(query), doseq=doseq)
+
+try:
+ from urllib.request import DataHandler as compat_urllib_request_DataHandler
+except ImportError: # Python < 3.4
+ # Ported from CPython 98774:1733b3bd46db, Lib/urllib/request.py
+ class compat_urllib_request_DataHandler(compat_urllib_request.BaseHandler):
+ def data_open(self, req):
+ # data URLs as specified in RFC 2397.
+ #
+ # ignores POSTed data
+ #
+ # syntax:
+ # dataurl := "data:" [ mediatype ] [ ";base64" ] "," data
+ # mediatype := [ type "/" subtype ] *( ";" parameter )
+ # data := *urlchar
+ # parameter := attribute "=" value
+ url = req.get_full_url()
+
+ scheme, data = url.split(':', 1)
+ mediatype, data = data.split(',', 1)
+
+ # even base64 encoded data URLs might be quoted so unquote in any case:
+ data = compat_urllib_parse_unquote_to_bytes(data)
+ if mediatype.endswith(';base64'):
+ data = binascii.a2b_base64(data)
+ mediatype = mediatype[:-7]
+
+ if not mediatype:
+ mediatype = 'text/plain;charset=US-ASCII'
+
+ headers = email.message_from_string(
+ 'Content-type: %s\nContent-length: %d\n' % (mediatype, len(data)))
+
+ return compat_urllib_response.addinfourl(io.BytesIO(data), headers, url)
+
+try:
+ compat_basestring = basestring # Python 2
+except NameError:
+ compat_basestring = str
+
+try:
+ compat_chr = unichr # Python 2
+except NameError:
+ compat_chr = chr
+
+try:
+ from xml.etree.ElementTree import ParseError as compat_xml_parse_error
+except ImportError: # Python 2.6
+ from xml.parsers.expat import ExpatError as compat_xml_parse_error
+
+if sys.version_info[0] >= 3:
+ compat_etree_fromstring = xml.etree.ElementTree.fromstring
+else:
+ # python 2.x tries to encode unicode strings with ascii (see the
+ # XMLParser._fixtext method)
+ etree = xml.etree.ElementTree
+
+ try:
+ _etree_iter = etree.Element.iter
+ except AttributeError: # Python <=2.6
+ def _etree_iter(root):
+ for el in root.findall('*'):
+ yield el
+ for sub in _etree_iter(el):
+ yield sub
+
+ # on 2.6 XML doesn't have a parser argument, function copied from CPython
+ # 2.7 source
+ def _XML(text, parser=None):
+ if not parser:
+ parser = etree.XMLParser(target=etree.TreeBuilder())
+ parser.feed(text)
+ return parser.close()
+
+ def _element_factory(*args, **kwargs):
+ el = etree.Element(*args, **kwargs)
+ for k, v in el.items():
+ if isinstance(v, bytes):
+ el.set(k, v.decode('utf-8'))
+ return el
+
+ def compat_etree_fromstring(text):
+ doc = _XML(text, parser=etree.XMLParser(target=etree.TreeBuilder(element_factory=_element_factory)))
+ for el in _etree_iter(doc):
+ if el.text is not None and isinstance(el.text, bytes):
+ el.text = el.text.decode('utf-8')
+ return doc