Visual debugger for yacc, anyone?

I am contemplating creating a visual debugger for LALR parsers. It
would allow the user to step through a parse, get example input token
streams to illustrate shift/reduce conflicts, reduce/reduce conflicts,
etc. It could give sample input streams for a given nonterminal or
production. The user could explore the grammar in a hypertext-like
way. Parser states would be available for those familiar with LR
parser generation.


I am currently deciding what to do for a class project. If you would
be interested in the tool described above, please send me mail and I
will send you a more detailed questionnaire. Don't worry -- it is very
brief; we haven't even decided whether we're doing this project
yet. (It depends on whether the idea generates sufficient interest.)


Thanks,
Steve <sfink@cs.berkeley.edu>


PS Pointers to similar systems would also be appreciated. Please tell me if
I'm reinventing the wheel!
[MKS yacc has a somewhat similar wheel, as do a few of the commercial
yacc-like systems. -John]
--

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