Lib/macurl2path.py

   1 """Macintosh-specific module for conversion between pathnames and URLs.
   2
   3 Do not import directly; use urllib instead."""
   4
   5 import string
   6 import urllib
   7 import os
   8
   9 def url2pathname(pathname):
  10     "Convert /-delimited pathname to mac pathname"
  11     #
  12     # XXXX The .. handling should be fixed...
  13     #
  14     tp = urllib.splittype(pathname)[0]
  15     if tp and tp <> 'file':
  16         raise RuntimeError, 'Cannot convert non-local URL to pathname'
  17     # Turn starting /// into /, an empty hostname means current host
  18     if pathname[:3] == '///':
  19         pathname = pathname[2:]
  20     elif pathname[:2] == '//':
  21         raise RuntimeError, 'Cannot convert non-local URL to pathname'
  22     components = string.split(pathname, '/')
  23     # Remove . and embedded ..
  24     i = 0
  25     while i < len(components):
  26         if components[i] == '.':
  27             del components[i]
  28         elif components[i] == '..' and i > 0 and \
  29                                   components[i-1] not in ('', '..'):
  30             del components[i-1:i+1]
  31             i = i-1
  32         elif components[i] == '' and i > 0 and components[i-1] <> '':
  33             del components[i]
  34         else:
  35             i = i+1
  36     if not components[0]:
  37         # Absolute unix path, don't start with colon
  38         rv = string.join(components[1:], ':')
  39     else:
  40         # relative unix path, start with colon. First replace
  41         # leading .. by empty strings (giving ::file)
  42         i = 0
  43         while i < len(components) and components[i] == '..':
  44             components[i] = ''
  45             i = i + 1
  46         rv = ':' + string.join(components, ':')
  47     # and finally unquote slashes and other funny characters
  48     return urllib.unquote(rv)
  49
  50 def pathname2url(pathname):
  51     "convert mac pathname to /-delimited pathname"
  52     if '/' in pathname:
  53         raise RuntimeError, "Cannot convert pathname containing slashes"
  54     components = string.split(pathname, ':')
  55     # Remove empty first and/or last component
  56     if components[0] == '':
  57         del components[0]
  58     if components[-1] == '':
  59         del components[-1]
  60     # Replace empty string ('::') by .. (will result in '/../' later)
  61     for i in range(len(components)):
  62         if components[i] == '':
  63             components[i] = '..'
  64     # Truncate names longer than 31 bytes
  65     components = map(_pncomp2url, components)
  66
  67     if os.path.isabs(pathname):
  68         return '/' + string.join(components, '/')
  69     else:
  70         return string.join(components, '/')
  71
  72 def _pncomp2url(component):
  73         component = urllib.quote(component[:31], safe='')  # We want to quote slashes
  74         return component
  75
  76 def test():
  77     for url in ["index.html",
  78                 "bar/index.html",
  79                 "/foo/bar/index.html",
  80                 "/foo/bar/",
  81                 "/"]:
  82         print `url`, '->', `url2pathname(url)`
  83     for path in ["drive:",
  84                  "drive:dir:",
  85                  "drive:dir:file",
  86                  "drive:file",
  87                  "file",
  88                  ":file",
  89                  ":dir:",
  90                  ":dir:file"]:
  91         print `path`, '->', `pathname2url(path)`
  92
  93 if __name__ == '__main__':
  94     test()