Re: [Jscheme-user] Multiple Independent JSchemes

[matthew g. <mgr...@co...>]

On May 22, 2004, at 9:24 AM, Timothy John Hickey wrote:

>
> On May 22, 2004, at 8:47 AM, matthew grisius wrote:
>
>> Hi Tim,
>>
>> I would like to have multiple REPLs each with their own input, 
>> output, and error,  yet share an Evaluator 'context'. In effect 
>> separating the R and the P from the E. Should or could this be 
>> accomplished by having separate instances of a jsint.Evaluator and 
>> then share the 'environment' between them? Would that be the 'correct 
>> way'? Thanks, any help would be appreciated.
> You can do this by creating two JScheme instances js1 and js2 and then 
> manually replacing the dynamic environment
> of the evaluator in js2 by that in js1
>
> (define js1 (jscheme.JScheme.))
> (define js2 (jscheme.JScheme.)))
> (define ev1 (.getEvaluator js1))
> (define ev2 (.getEvaluator js2))
> (.INTERACTION_ENVIRONMENT$ ev2 (.INTERACTION_ENVIRONMENT$ ev1))
>
> How would you be interested in using such a pair of instances?
The ability to have multiple 'scheme listener' command line windows.

Ok,  a 'dynamic environment' is shared between two REPLs. The two 
separate Evaluators are able to have their own input, output, and error 
ports:

(.input$ ev1 (my-input-port my-window-1))
(.output$ ev1 (my-output-port my-window-1))
(.error$ ev1 (my-error-port my-window-1))

(.input$ ev2 (my-input-port my-window-2))
(.output$ ev2 (my-output-port my-window-2))
(.error$ ev2 (my-error-port my-window-2))

Does that make more sense and do you see any problems with that 
approach? Thanks.

-matt grisius
>
> ---Tim---
>
>>
>> -matt grisius
>>
>>
>> On May 19, 2004, at 12:56 AM, Timothy John Hickey wrote:
>>
>>> The jscheme.JS class has been modified so that it allows multiple 
>>> Independent JScheme
>>> instances. This requires a change to the way the JS class is used to 
>>> call Scheme from Java.
>>> Many thanks to Toby Allsopp for this extension!
>>>
>>> Previously, JS defined static methods for evaluating expressions and 
>>> calling procedures.
>>> All of those methods are now instance methods and you first need to 
>>> construct an instance:
>>>
>>> JS js = new JS();
>>>     js.load(new java.io.File("app.init"));
>>>     js.call("describe", this);
>>>   ...
>>> or from Scheme
>>> (define js (jscheme.JS.))
>>> (.eval js '(define z 5))
>>> (.eval js '(+ z 1))
>>>
>>> See the javadoc for jscheme.JS for more examples....
>>>
>>> This should make it easier to build JScheme plugins for Eclipse and 
>>> other IDEs
>>>
>>> If you run into any problems, please tell us right away so we can 
>>> fix any bugs
>>> that may have been introduced by this fairly major change.
>>>
>>> Cheers,
>>> ---Tim---
>>>
>>>
>>>
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>>
>>
>>
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