Hello All,
I'm more or less a newbie using antlr. I have a small issue on creating
the AST, using rewrite rules. I'm so sorry if this is a FAQ or similar! :)
I have the following productions (it's like an algebra with
3 operators with different priorities):
targetsExpr : (category) ('CAND' targetsExpr)*
->^('CAND' category targetsExpr*)
;
category: (matchEl) ('OR' category)*
-> ^('OR' matchEl category* )
;
matchEl : factor ('AND' factor)* ->^('AND' factor*)
;
factor
: matchId OPAR targetValue COMMA targetName CPAR ->^('FAC' matchId
targetValue targetName)
The problem is that the AST created contains productions as:
CAND ->OR -> OR-> AND (FAC, FAC).
The second OR is created because the ``category'' production is passed
multiple times.
Is there a way to not create these kind of rules?
You can see a sample of the AST created in
http://www.mascanc.net/~max/policy.pdf.
--
Massimiliano Masi
http://www.mascanc.net/~max
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