1 """riscos specific module for conversion between pathnames and URLs.

     2 Based on macurl2path.

     3 Do not import directly, use urllib instead."""

     4 

     5 import string

     6 import urllib

     7 

     8 __all__ = ["url2pathname","pathname2url"]

     9 

    10 __slash_dot = string.maketrans("/.", "./")

    11 

    12 def url2pathname(url):

    13     """OS-specific conversion from a relative URL of the 'file' scheme

    14     to a file system path; not recommended for general use."""

    15     tp = urllib.splittype(url)[0]

    16     if tp and tp <> 'file':

    17         raise RuntimeError, 'Cannot convert non-local URL to pathname'

    18     # Turn starting /// into /, an empty hostname means current host

    19     if url[:3] == '///':

    20         url = url[2:]

    21     elif url[:2] == '//':

    22         raise RuntimeError, 'Cannot convert non-local URL to pathname'

    23     components = string.split(url, '/')

    24     if not components[0]:

    25         if '$' in components:

    26             del components[0]

    27         else:

    28             components[0] = '$'

    29     # Remove . and embedded ..

    30     i = 0

    31     while i < len(components):

    32         if components[i] == '.':

    33             del components[i]

    34         elif components[i] == '..' and i > 0 and \

    35                                   components[i-1] not in ('', '..'):

    36             del components[i-1:i+1]

    37             i -= 1

    38         elif components[i] == '..':

    39             components[i] = '^'

    40             i += 1

    41         elif components[i] == '' and i > 0 and components[i-1] <> '':

    42             del components[i]

    43         else:

    44             i += 1

    45     components = map(lambda x: urllib.unquote(x).translate(__slash_dot), components)

    46     return '.'.join(components)

    47 

    48 def pathname2url(pathname):

    49     """OS-specific conversion from a file system path to a relative URL

    50     of the 'file' scheme; not recommended for general use."""

    51     return urllib.quote('///' + pathname.translate(__slash_dot), "/$:")

    52 

    53 def test():

    54     for url in ["index.html",

    55                 "/SCSI::SCSI4/$/Anwendung/Comm/Apps/!Fresco/Welcome",

    56                 "/SCSI::SCSI4/$/Anwendung/Comm/Apps/../!Fresco/Welcome",

    57                 "../index.html",

    58                 "bar/index.html",

    59                 "/foo/bar/index.html",

    60                 "/foo/bar/",

    61                 "/"]:

    62         print '%r -> %r' % (url, url2pathname(url))

    63     print "*******************************************************"

    64     for path in ["SCSI::SCSI4.$.Anwendung",

    65                  "PythonApp:Lib",

    66                  "PythonApp:Lib.rourl2path/py"]:

    67         print '%r -> %r' % (path, pathname2url(path))

    68 

    69 if __name__ == '__main__':

    70     test()