Andrew Dalke schrieb:
> I have looked at the spec, and can't figure out how its explanation
> matches the observed urljoin results. Steve's excerpt trimmed out
> the strangest example.
Unfortunately, you didn't say which of these you want explained.
As it is tedious to write down even a single one, I restrain to the
one with the What?! remark.
>>>> urlparse.urljoin("http://blah.com/a/b/c";, "../../../..") # What?!
> 'http://blah.com/'
Please follow me through section 5 of
http://www.ietf.org/rfc/rfc3986.txt
5.2.1: Pre-parse the Base URI
B.scheme = "http"
B.authority = "blah.com"
B.path = "/a/b/c"
B.query = undefined
B.fragment = undefined
5.2.2: Transform References
parse("../../../..")
R.scheme = R.authority = R.query = R.fragment = undefined
R.path = "../../../.."
(strictness not relevant, R.scheme is already undefined)
R.scheme is not defined
R.authority is not defined
R.path is not ""
R.path does not start with /
T.path = merge("/a/b/c", "../../../..")
T.path = remove_dot_segments(T.path)
T.authority = "blah.com"
T.scheme = "http"
T.fragment = undefined
5.2.3 Merge paths
merge("/a/b/c", "../../../..") =
(base URI does have path)
"/a/b/../../../.."
5.2.4 Remove Dot Segments
remove_dot_segments("/a/b/../../../..")
1. I = "/a/b/../../../.."
O = ""
2. A (does not apply)
B (does not apply)
C (does not apply)
D (does not apply)
E O="/a" I="/b/../../../.."
2. E O="/a/b" I="/../../../.."
2. C O="/a" I="/../../.."
2. C O="" I="/../.."
2. C O="" I="/.."
2. C O="" I="/"
2. E O="/" I=""
3. Result: "/"
5.3 Component Recomposition
result = ""
(scheme is defined)
result = "http:"
(authority is defined)
result = "http://blah.com";
(append path)
result = "http://blah.com/";
HTH,
Martin
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