[antlr-interest] Re: Newbie Question about Syntactic Predicates
hawkwall
hawkwall at yahoo.com
Fri Nov 7 19:36:38 PST 2003
Jim,
You are right about the oversight, I missed that when I copied in the
post. I will look at the testLiterals option and play with it.
Thanks for taking the time to make the example, it seems much easier.
I don't want to do more work than I have to.
Loring,
Thanks for the hint about left factoring the NUMBER.OF. There are
lots of places I can do that, and it will help. You also mentioned
testLiterals, so I will dig more. From you comment about doing more
work in the parser, I appreciate your advice.
Thank you both for your answers. At some point, I plan to add actions
and use Hibernate to populate a database from the parse. I was
thinking it would be cleaner if more of the parsing work was done in
the lexer, because I assume the actions will be fairly complex. I
have used the perl module Parse::RecDescent in the past to parse files
and build comma seperated text files that were then loaded into the
database. I spent way to much time debugging the column names and
making sure things were in the right order. I wish I could say I
understood the internals of P:RD, but in actuality, I just tinkered
until I got an acceptable result. Already, I have better
understanding of what antlr is doing, the generated code is much
easier to read. I hope this approach with antlr and hibernate will
work better. I was kinda shocked to not see regular expressions in
antlr, but I don't think I will miss them. Would an AST serve me
better to populate the database? I will need to get a better
understanding of AST's if so. Again, I am grateful for the help.
Mike
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