[Openmcl-devel] pref with vriable field name

[Taoufik Dachraoui]

I tried this but it did not work cause the type is prefixed with a column
and when interning
it returns a symbol prefixed by a backslash

> Error: Unknown foreign type: :\'<XE>XPOSE<E>VENT
> While executing: CCL::%PARSE-FOREIGN-TYPE, in process listener(1).
> Type :GO to continue, :POP to abort, :R for a list of available restarts.
> If continued: Skip loading init file.

Taoufik

On Mon, Jan 25, 2010 at 10:30 AM, Ron Garret <ron at flownet.com> wrote:

> Try something like:
>
> (defmacro xpref (thing type slotname)
>  `(pref ,thing ,(intern (format nil "~A.~A" type slotname))))
>
> rg
>
> On Jan 25, 2010, at 12:25 AM, Taoufik Dachraoui wrote:
>
> > Hi
> >
> > I have the following code:
> >
> > (defmacro defonevent (onevent eventtype xstruct)
> >   `(defmacro ,onevent (&rest body)
> >      `(progn
> >       (if (null (gethash (window *context*) %event-handlers%))
> >           (setf (gethash (window *context*) %event-handlers%)
> (make-hash-table)))
> >       (setf (gethash ,',eventtype (gethash (window *context*)
> %event-handlers%))
> >             #'(lambda (event)
> >                 (macrolet ((this (var) `(xpref event ',',',xstruct
> ,var)))
> >                   (this window) ; to avoid the warning if the event is
> not used in the body
> >                   , at body))))))
> >
> > (defonevent on-expose #$Expose :<XE>xpose<E>vent)
> > (defonevent on-buttonpress #$ButtonPress :<XB>utton<E>vent)
> > (defonevent on-buttonrelease #$ButtonRelease :<XB>utton<E>vent)
> > (defonevent on-keypress #$KeyPress :<XK>ey<E>vent)
> > (defonevent on-keyrelease #$KeyRelease :<XK>ey<E>vent)
> > (defonevent on-clientmessage #$ClientMessage :<XC>lient<M>essage<E>vent)
> > (defonevent on-mapnotify #$MappingNotify :<XM>ap<E>vent)
> >
> >
> > ; usage
> > (cell ....
> >   (on-expose
> >      (drawline 0 0 (this width) (this height)))
> >   ...
> >  )
> >
> >
> > The issue is that I do not know how to implement xpref. The pref macro
> takes an accessor of the form
> > type.field but I need a macro that takes the type of the structure and
> the field name separately.
> >
> > Thank you for your help
> >
> > Taoufik
> > _______________________________________________
> > Openmcl-devel mailing list
> > Openmcl-devel at clozure.com
> > http://clozure.com/mailman/listinfo/openmcl-devel
>
>
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