Subj : Step-by-step execution...
To   : netscape.public.mozilla.jseng
From : Corey Murtagh <emonk@slingshot.co.nz.no.uce>
Date : Fri May 23 2003 07:26 pm

For a very large project I worked on a few years ago we needed a 
scripting environment that would break at the end of each statement, 
effectively single-stepping through the script.  I won't go into the 
reasons why this was necessary, but it was.  We created our own 
scripting language, based loosely on Basic, with compiler and virtual 
machine.

Now we would like to update this system, preferrably using JavaScript as 
the scripting language since it is so much more versatile than the 
language we created.

To clarify: we need to have the script pause at the end of ANY 
statement, so this code:

var sum = 0;
var count = 0;
   for (var i = 0; i < 10; i++)
   {
     sum += i;
     count++;
   }

....would break at least on the 'var...',  'sum += i' and 'count++' 
statements, and preferably at least once per pass through the for loop 
(before or after evaluating the condition).

Is it currently possible to do this with SpiderMonkey?  If not, does 
anyone have any thoughts on how hard it would be to adapt SpiderMonkey 
to this task?

I really would like to use SM, I just need to get it to jump through 
hoops the way we tell it to :>

-- 
Corey Murtagh
The Electric Monk
"Quidquid latine dictum sit, altum viditur!"

.