[Openmcl-devel] make-keyword

Taoufik Dachraoui taoufik.dachraoui at wanadoo.fr
Thu Oct 22 08:03:02 UTC 2009


On Oct 22, 2009, at 9:47 AM, Taoufik Dachraoui wrote:

> Hi
>
> I am trying to define the following macro (that defines macros)
>
> (defmacro defviewclass (sym)
>  (let ((kwd (make-keyword sym)))
>    `(defmacro ,sym (attrs &rest body)
>       (let ((a `(, at attrs)))
> 	 (if (null a)
> 	     (setf a '(:class ,kwd))
> 	     (setf (getattr :class a) ,kwd))
> 	 `(m1 ,a , at body)))))
>
> is there a function make-keyword that takes a symbol s as parameter  
> and
> returns a keyword k such that (eq (symbol-name s) (symbol-name k))  
> is T
>
> Taoufik
>
I found the following:

(defmacro defviewclass (sym)
   (let ((kwd (read-from-string (format nil ":~A" sym))))
     `(defmacro ,sym (attrs &rest body)
        (let ((a `(, at attrs)))
	 (if (null a)
	     (setf a '(:class ,kwd))
	     (setf (getattr :class a) ,kwd))
	 `(m1 ,a , at body)))))

Is there any issues in using read-from-string?

Taoufik









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