A debugger for yacc

There's a yacc debugger called ydb which would solve both of the recent yacc
problems raised in this group.


Simon Voogd wrote about problems getting precedence statements to work as
expected. With ydb you can say directly how you want the parse to go, and it
will design a precedence system to do the job, and build thesystem into your
grammar file.


Jerry Ratner asked about getting the set of tokens that can follow a given
token at some point in the parse. There's a command which does just that. You
can also do the same thing in a static way - find the follow set for a symbol
in the grammar. It can do other nifty things too.


It's sold by Bloomsbury Software Group, ydb@bsg.com, (415) 964-3486,
P.O. Box 390018 in Mountain View, CA 94039.


Larry
[Reports from other users would be welcome. -John]
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