[Openmcl-devel] inverse of #$ - does it exist?

Gary Byers gb at clozure.com
Thu Apr 15 19:49:49 UTC 2010


Not really; by the time it's stored in the .cdb file, it's just an integer constant
(not a "member of the NSStringEncoding enumeration").

You can enumerate the key/value pairs in a .cdb file (a la MAPHASH); I
don't remember how off the top of my head; the ObjC bridge does this
to find all classes/methods.  If enumerated types were better
supported (if integer constants were stored as members of that enumerated
type, not just as integers) you could do:

(maphash-like-thing-on-cdb-file
    (lambda (k v)
      (if (is-member-of-enumeration v NSStringEncoding)
        (add-to-your-own-mapping v k))))

and then use that mapping to map values back to names.

You could fake that by saying "the value is likely a member of the NSStringEncoding
enumeration if it's an integer and the key contains the substring "StringEncoding".
That's a bit sleazy and imprecise, but I don't think that you can do better.

On Thu, 15 Apr 2010, Raffael Cavallaro wrote:

> I know that I can do:
>
> ? #$NSUTF8StringEncoding
> 4
>
> Is there any way to do the reverse - to determine the symbolic name given the type (here, NSStringEncoding) and the integer value?
>
> warmest regards,
>
> Ralph
>
>
> Raffael Cavallaro
> raffaelcavallaro at me.com
>
>
>
>
>
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