Hi, I want to develop a java Source code instrumentor for analysing the source code. For example i want to analyse a conditional statement such as

x1=10;
x2=12;
.
.
.
xn=6
and i've condition such as

if ((x1 x5)) {do this thing;}
else {do that thing;}

at this point i want the instrumentor to insert code. e.g,
declare temp1, temp2,...tempn variables (egual to the number of variable used in the condition) and then return the values such as (x2-x1)+(x3-x5).
Can i do such kind of intrumentation with ANTLR? how?