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Antlr provides hooks for debugging (using the -debug command line switch) and this should be integrated into the antlr module. An debugger called ParseView, written by Scott Stanchfield (mailto:scott@javadude.com), provides a baseline for functionality needed. Although this tool is out of date, I have modified (hacked) it so that it will run under JDK1.3 and Antlr 2.7.1. The development can proceed in two directions. If Scott is willing to contribute his code to the netbeans open source repository, that could be used as a starting point. Otherwise, a debugger can be written from scratch, perhaps referring to Scott's implementation as a 'HOWTO'. The latter option may be best to take advantage of the netbeans debugger infrastructure.
Obsolete milestone, please reevaluate