Michel tilman did that too in Zork but lukas solution worked in 2  
hours. :)

On 3 juin 06, at 10:59, Hans-Martin Mosner wrote:

> stéphane ducasse wrote:
>
>> in Pier or Smallwiki lukas uses the debugger to step over  
>> smalltalk  snippet to ensure that we cannot
>> write crazy expressions. So this would be nice to use that  
>> facility  and to produce a site that people can try and propose  
>> them some  exercises.
>
> A good approach might be zo parse expressions using the  
> RefactoringBrowser and run some kind of interpreter on these.
> You'd have an even safer environment, and could provide very nice  
> rendering of the current state and call stack.
> I've built such an interpreter to execute rules in a VA runtime  
> image, and it works pretty well.
>
> Cheers,
> Hans-Martin
>