Re: Attaching an alist to a grob

[Urs Liska]

Am 14.01.2015 um 04:08 schrieb Paul Morris:
> Urs Liska wrote
> > Now I've checked - it's perfect. Thank you again!
> >
> > There is no alist? predicate, but it's very easy to define:
> >
> > #(define (alist? lst)
> >      (and (list? lst)
> >             (every pair? lst)))
> Glad to help and glad someone else is benefiting from this.  (On a related
> note, I also worked out how to create custom context properties if that's
> ever useful.)

Currently this doesn't ring a bell with me but I can imagine I'll come 
back to this one day.

> Hey, look at you slinging that Scheme like it was nothing!  ;-)

Yes, I made some surprising progress with Scheme recently. I didn't even 
get stuck in the ands and parens in the actual predicate I wrote

#(define (annotation? obj)
   (and
    (and (list? obj)
         (every pair? obj))
    (and (if (assoc-ref obj "type") #t #f)
         (if (assoc-ref obj "location") #t #f))))

:-)

Unfortunately that does *not* mean there are no huge mysteries left ...

Urs

> Cheers,
> -Paul
>
>
>
>
>
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