Writing CodeNarc rules

Hello all.

I am trying to write a CodeNarc rule and am struggling with just how to 
use the AST code visitor support (or anything else) to get were I want to 
go. Does anyone know of a resource that might be helpful? I have looked at 
all of the obvious ones from the CodeNarc site as well as the distributed 
rules, google searches, etc.

If it helps, I am trying to write a rule that checks to make sure the body 
of particular methods consists entirely of a try/catch block where 
Exception is caught. I have gotten as far as verifying the first statement 
in the method is a try/catch statement using an AbstractMethodVisitor but 
am struggling a bit in figuring out how to make sure there is no statement 
following it in the method.

Thanks for any insight.

-Andrew Goodspeed

---------------
"Of all our decision rules, the one that most transforms our thinking is 
the one that is missing today in most companies, a quantified cost of 
delay." -Don Reinertsen 

"[Regarding] our economic decisions...we are trying to improve them, not 
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