> On Jul 7, 2015, at 5:57 PM, [email protected] wrote:
>
> I am a current undergraduate staff member for the UC Berkeley CS61AS
> introductory CS course. We switched from STK Scheme to Racket this summer,
> and were interested in creating an environment diagram drawer similar to
> Online Python Tutor for Racket. OPT is available on GitHub and uses a
> frontend to draws the diagrams from a JSON representation of frames for each
> step of execution. Backends exist for various languages, but not for
> Scheme/Racket.
Building a Racket back-end for OPT would be quite straightforward. I’ve taken a
quick look at the interface, and I had an undergraduate take a brief crack at
it.
With that said, I’m not sure how I feel about this model of computation; I
think the OPT is well-suited for languages that emphasize loops and mutation,
but it doesn’t have a nice tidy representation for the program context.
I’d be the first to admit that the stepper is not currently very attractive,
though.
John
>
> I messaged Dr. Tobin-Hochstadt ("samth") but it turns out he didn't write the
> debugger, and pointed me here. I was wondering how I could get started with
> building such a environment diagram drawer backend. Thanks. I've read through
> parts of drracket/drracket/gui-debugger, and have a vague grasp on the Racket
> mixin system, plugins, (syntax) objects, but any guidance is welcome.
>
>
> Tony
>
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