Expression Handling Again

The usage of the StringMacro to use the #set directive
works great. I was wondering if there is anything
exposed to evaluate the expression without modifying
the context. 

This works great, but I would like to leave the
context as is, not adding new temp variables to the
context.

Context ctx = new Context();
ctx.put("val1", 1);
ctx.put("val2", 155);
Macro macro = null;
macro = new StringMacro("#set $val = $val1 + $val2");
macro.evaluate( ctx);
Integer val = (Integer)ctx.get("val");


I am looking forward to the 2.0 release. 


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