Subj : Rhino - looking for ways to reset a scope.txt
To   : netscape.public.mozilla.jseng
From : ariel_ml@netvision.net.il (Ariel Malka)
Date : Wed Aug 27 2003 04:50 pm

Taking in count that:

- Context.Enter() and Context.initStandardObjects() are producing
(harmless but annoying) exceptions with the MS JVM.

- Context.initStandardObjects() seems to be an "expensive" method.

I would like to minimize the invocations of these 2 methods.

If i only wanted to produce a javascript interpreter which function in
a kind of "interactive-mode" (scope information is conserved between
successive runs), i guess i would just put these 2 methods at the
beginning of my applet and that' all.

But i want to produce an interpreter which can also work in
"execution-mode" (scope information should be cleared, before each
run).

In this case, is there a way (other than initStandardObjects) to reset
a scope?


Actually, the answer may lie in the following question:

Let's say i'm using a custom ScriptableObject named Shell which gives
access to a "print" function.

For initialization, I would use:

cx = Context.enter();

Shell global = new Shell();
cx.initStandardObjects(global);

String[] names = { "print" };
try
{
global.defineFunctionProperties(names, Shell.class,
ScriptableObject.DONTENUM);
}
catch (PropertyException e) {}


The question is: if i want to reset the scope at each new execution,
should i repeat the same initialization code? (seems a bit overkill).

Note: by reseting the scope, I mean essentially clearing all the
user-defined variables, functions, etc. that have been created during
a previous execution.

Any clues? Thanks!

.