Lib/plat-riscos/rourl2path.py

   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 import os
   8
   9 __all__ = ["url2pathname","pathname2url"]
  10
  11 __slash_dot = string.maketrans("/.", "./")
  12
  13 def url2pathname(url):
  14     "Convert URL to a RISC OS path."
  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     "Convert a RISC OS path name to a file url."
  50     return urllib.quote('///' + pathname.translate(__slash_dot), "/$:")
  51
  52 def test():
  53     for url in ["index.html",
  54                 "/SCSI::SCSI4/$/Anwendung/Comm/Apps/!Fresco/Welcome",
  55                 "/SCSI::SCSI4/$/Anwendung/Comm/Apps/../!Fresco/Welcome",
  56                 "../index.html",
  57                 "bar/index.html",
  58                 "/foo/bar/index.html",
  59                 "/foo/bar/",
  60                 "/"]:
  61         print `url`, '->', `url2pathname(url)`
  62     print "*******************************************************"
  63     for path in ["SCSI::SCSI4.$.Anwendung",
  64                  "PythonApp:Lib",
  65                  "PythonApp:Lib.rourl2path/py"]:
  66         print `path`, '->', `pathname2url(path)`
  67
  68 if __name__ == '__main__':
  69     test()