How can I build parse trees not ASTs?

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It's simple. Using the debug event interface, the predefined ParseTreeBuilder class listens for debug events and build a parse tree. Just turn on -debug commandline option and then pass in the ParseTreeBuilder listener. Ask the listener for its tree and, using the standard toStringTree() method for any CommonTree, print it out.

Sample run:

java TestP
int i;
i=4;
(<grammar prog> (prog (decl (type int) i ;) (stat i = (expr 4))))