277 def netlocsplit(netloc):

   278     '''split [user[:passwd]@]host[:port] into 4-tuple.'''

   279 

   280     a = netloc.find('@')

   281     if a == -1:

   282         user, passwd = None, None

   283     else:

   284         userpass, netloc = netloc[:a], netloc[a + 1:]

   285         c = userpass.find(':')

   286         if c == -1:

   287             user, passwd = urllib.unquote(userpass), None

   288         else:

   289             user = urllib.unquote(userpass[:c])

   290             passwd = urllib.unquote(userpass[c + 1:])

   291     c = netloc.find(':')

   292     if c == -1:

   293         host, port = netloc, None

   294     else:

   295         host, port = netloc[:c], netloc[c + 1:]

   296     return host, port, user, passwd

   297 

   298 def netlocunsplit(host, port, user=None, passwd=None):

   299     '''turn host, port, user, passwd into [user[:passwd]@]host[:port].'''

   300     if port:

   301         hostport = host + ':' + port

   302     else:

   303         hostport = host

   304     if user:

   305         quote = lambda s: urllib.quote(s, safe='')

   306         if passwd:

   307             userpass = quote(user) + ':' + quote(passwd)

   308         else:

   309             userpass = quote(user)

   310         return userpass + '@' + hostport

   311     return hostport

   312 

   344 

   345 _safe = ('abcdefghijklmnopqrstuvwxyz'

   346          'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

   347          '0123456789' '_.-/')

   348 _safeset = None

   349 _hex = None

   350 def quotepath(path):

   351     '''quote the path part of a URL

   352 

   353     This is similar to urllib.quote, but it also tries to avoid

   354     quoting things twice (inspired by wget):

   355 

   356     >>> quotepath('abc def')

   357     'abc%20def'

   358     >>> quotepath('abc%20def')

   359     'abc%20def'

   360     >>> quotepath('abc%20 def')

   361     'abc%20%20def'

   362     >>> quotepath('abc def%20')

   363     'abc%20def%20'

   364     >>> quotepath('abc def%2')

   365     'abc%20def%252'

   366     >>> quotepath('abc def%')

   367     'abc%20def%25'

   368     '''

   369     global _safeset, _hex

   370     if _safeset is None:

   371         _safeset = set(_safe)

   372         _hex = set('abcdefABCDEF0123456789')

   373     l = list(path)

   374     for i in xrange(len(l)):

   375         c = l[i]

   376         if (c == '%' and i + 2 < len(l) and

   377             l[i + 1] in _hex and l[i + 2] in _hex):

   378             pass

   379         elif c not in _safeset:

   380             l[i] = '%%%02X' % ord(c)

   381     return ''.join(l)