Re: Attaching an alist to a grob

[Richard Shann]

On Wed, 2015-01-14 at 11:29 +0100, Urs Liska wrote:
> Am 14.01.2015 um 11:18 schrieb Mattes:
> >   
> > Am Mittwoch, 14. Januar 2015 09:42 CET, Urs Liska <address@hidden> schrieb:
> >   
> >> 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))))
> > Proper indentation helps ;-)
> > But why so contrived? Your code is equivalent to:
> >
> > #(define (annotation? obj)
> >     (and
> >      (list? obj)
> >      (every pair? obj)
> >      (if (assoc-ref obj "type") #t #f)
> >      (if (assoc-ref obj "location") #t #f)))

...  and is this just equivalent to:

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


???

Richard



> >
> > HTH Ralf Mattes
> >   
> >   
> >
> 
> Thanks, this is of course better.
> sorting out nested conditionals has never been my strongest point ;-)
> 
> Urs
> 
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