[armedbear-devel] Proposal for URL to be used as Pathnames
evenson at panix.com
Fri Mar 26 08:34:48 UTC 2010
I've [committed to an initial design] for URLs to be used as
Pathnames, which I am in the process of implementing. The primary use
of this functionality will be to be able to eventually express OSGi
bundles within ASDF system definitions.
The gist of the proposal is to represent a URL with a Pathname whose
HOST component is a list. The list will be an association list with the
key :SCHEME containing the URL scheme and :AUTHORITY containing the URL
authority. The DIRECTORY, NAME, and TYPE components will be used to
construct the PATH of the URL.
As an example, "http://example.org:8080/org/armedbear/lisp/boot.lisp"
would be converted to a Pathname as follows
host: (:SCHEME "http" :AUTHORITY "example.org:8080"),
directory: (:ABSOLUTE "org" "armedbear" "lisp"),
As an answer to Alessio's question (long ago) about whether URLs should
really be a Pathname or if we are better off using a class, I think that
they really are better abstracted as a Pathname because they a) have a
hierarchical path b) the network location has a strong resemblance to
how HOST is used for UNC mounts under Windows and c) being able to
express OSGi bundles in ASDF has a chance of working.
"A screaming comes across the sky. It has happened before, but there
is nothing to compare to it now."
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