Re: Reset an interpreter instance

"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.


Matthias



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