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      1 """Convert a NT pathname to a file URL and vice versa."""
      2 
      3 def url2pathname(url):
      4     """OS-specific conversion from a relative URL of the 'file' scheme
      5     to a file system path; not recommended for general use."""
      6     # e.g.
      7     # ///C|/foo/bar/spam.foo
      8     # becomes
      9     # C:\foo\bar\spam.foo
     10     import string, urllib
     11     # Windows itself uses ":" even in URLs.
     12     url = url.replace(':', '|')
     13     if not '|' in url:
     14         # No drive specifier, just convert slashes
     15         if url[:4] == '////':
     16             # path is something like ////host/path/on/remote/host
     17             # convert this to \\host\path\on\remote\host
     18             # (notice halving of slashes at the start of the path)
     19             url = url[2:]
     20         components = url.split('/')
     21         # make sure not to convert quoted slashes :-)
     22         return urllib.unquote('\\'.join(components))
     23     comp = url.split('|')
     24     if len(comp) != 2 or comp[0][-1] not in string.ascii_letters:
     25         error = 'Bad URL: ' + url
     26         raise IOError, error
     27     drive = comp[0][-1].upper()
     28     path = drive + ':'
     29     components = comp[1].split('/')
     30     for comp in components:
     31         if comp:
     32             path = path + '\\' + urllib.unquote(comp)
     33     # Issue #11474: url like '/C|/' should convert into 'C:\\'
     34     if path.endswith(':') and url.endswith('/'):
     35         path += '\\'
     36     return path
     37 
     38 def pathname2url(p):
     39     """OS-specific conversion from a file system path to a relative URL
     40     of the 'file' scheme; not recommended for general use."""
     41     # e.g.
     42     # C:\foo\bar\spam.foo
     43     # becomes
     44     # ///C|/foo/bar/spam.foo
     45     import urllib
     46     if not ':' in p:
     47         # No drive specifier, just convert slashes and quote the name
     48         if p[:2] == '\\\\':
     49         # path is something like \\host\path\on\remote\host
     50         # convert this to ////host/path/on/remote/host
     51         # (notice doubling of slashes at the start of the path)
     52             p = '\\\\' + p
     53         components = p.split('\\')
     54         return urllib.quote('/'.join(components))
     55     comp = p.split(':')
     56     if len(comp) != 2 or len(comp[0]) > 1:
     57         error = 'Bad path: ' + p
     58         raise IOError, error
     59 
     60     drive = urllib.quote(comp[0].upper())
     61     components = comp[1].split('\\')
     62     path = '///' + drive + ':'
     63     for comp in components:
     64         if comp:
     65             path = path + '/' + urllib.quote(comp)
     66     return path
     67