Re: lookup-def

Hi Oleg,

A late reply.

On Fri, 2004-09-10 at 22:24 -0700, [email protected] wrote:
> The procedures lookup-def and assq-def are quite frequent. The former
> is, unfortunately, defined and redefined in lots of places, sometimes
> with slightly different interfaces. Standardization is indeed in order.
> It seems that the following interface is a good compromise.

Looks good. I write these things all the time myself, and this
definition seems to take into account all the cases I normally use.

BTW, I did get guile-lib's packaging of ssax to use R5RS macros for
(sxml ssax), but defmacros for (sxml simple). Seems to have worked out
well, thanks for the hints.

It's stupid, but I feel uncomfortable with the fact that lookup-def is a
syntax. You could get all of the functionality with a regular procedure,
with the extension that if the default-value is a thunk it would be
executed. I don't know why I feel that way. Probably because I mainly
hack guile, and it doesn't have a canonical compiler, which makes
syncase slow to load and makes macros less advantageous speed-wise.

But I'll pull this in as a (sxml tools) guile module, I guess. (I hope
those R6RS folks can standardize on a module system..)

Cheers,
-- 
Andy Wingo <[email protected]>
http://ambient.2y.net/wingo/


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