1"""Convert a NT pathname to a file URL and vice versa."""
2
3def 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
38def 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