Re: Reset an interpreter instance

On 4/15/06, Matthias Radestock <[email protected]> wrote:
> "Marco Bakera" <[email protected]> writes:
>
> > The "problem" is that I get user input to be evaluated by a previously
> > with some of my own definitions inited interpreter instance. Although
> > it's possible to create such a new interpreter each run and init it
> > with some of my definition this process takes some time I wanted to
> > get rid off.
> >
> > Perhaps I can speed up the process by putting my own definitions into
> > the heapfile. But I didn't tried that. I just wanted to know whether
> > there may be a shorter way for me by simply calling (reset) or
> > something like this. ;)
>
> One way to accomplish what you want is to compile all your code, which
> will make it fast to load, and then load it into a fresh environment in
> which you subsequently evaluate the user code. Something along the lines
> of
>
> (define e (sisc-initial-environment))
> (eval '(load "your-code.scc") e)
> (eval user-code e)
>
> The environment you get from sisc-initial-environment is a child
> environment of the environment which contains all the bindings from the
> heap. Because it is a child env, any additions or modifications will not
> affect the parent environment.
>
> I think this is the best you can to do for the time being, without
> hacking into the sisc internals via s2j. I reckon there should be a
> better way though: One should be able to create child environments of
> *any* environment. Then you could write something like:
>
> (define e (sisc-initial-environment))
> (eval '(load "your-code.scc") e)
> (define ee (child-environment e))
> (eval user-code ee)
>
> and only repeat the last two steps in order to evaluate code in an
> environment that contains all heap bindings plus your own code. Please
> raise a feature request for this.
>

I tried something similar which didn't do it but I don't know why.
Perhaps you could give me some hint. :)

After compiling some sources a.scm into a.scc and loading it with
(load "a.scc") I got an exception by evaluating some function inside
the compiled code:

sisc.interpreter.SchemeException: ((message . "undefined variable
'lset-difference'."))

lset-difference is in srfi-1 and a.scm does require it with
(require-extension (srfi 1)). However the compiled version of a.scm
does not know about this.

Is this a bug or did I use something wrong?


Greetings,
Marco.

PS
However I will report the feature you mentioned to the bugtracker.

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