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/Lib/plat-riscos/rourl2path.py

http://unladen-swallow.googlecode.com/
Python | 70 lines | 63 code | 4 blank | 3 comment | 0 complexity | 094dfcb9ff9ddcfb26d47271f874bfdb MD5 | raw file
 1"""riscos specific module for conversion between pathnames and URLs.
 2Based on macurl2path.
 3Do not import directly, use urllib instead."""
 4
 5import string
 6import urllib
 7
 8__all__ = ["url2pathname","pathname2url"]
 9
10__slash_dot = string.maketrans("/.", "./")
11
12def 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
48def 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), "/$:")
52
53def test():
54    for url in ["index.html",
55                "/SCSI::SCSI4/$/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
69if __name__ == '__main__':
70    test()