[Maxima] Error catching in Mockmma

[Richard Fateman]

hmonroe.maxima at huntermonroe.com wrote:
> Before releasing Mockmma (a Mathematica emulator), I would like to improve the error catching. Right now errors throw the user back into Maxima, but I would like them to be thrown back into Mockmma. 
>   
I think that what you need is something like this ...  (not in the piece 
you selected)

replace this

#+kcl   (setq h (multiple-value-bind
	(iserr val)
	(system:error-set (list 'meval (list 'quote hin)))
	(if iserr (list 'Hold hin) val)))


by 

(setq h (handler-case (meval hin) 
                  (error (q) (format t "~%An error was produced in MockMMa: ~s") (list 'Hold hin))
                  (noerror (q) q)))


but I have not tested it.
assuming that GCL now has handler-case.

whether this has the desired effect, I don't know, since you were kind of vague on that.

I am also assuming that the meval is the mockmma::meval not maxima::meval, etc.

I still view the essence of MockMMA as the reverse engineering of the Mathematica pattern matcher
and rule system.  Is it still disabled in your version?

RJF