[antlr-interest] Please help with a grammar issue
Frank Du
frank.du at riskmetrics.com
Fri Oct 30 10:08:00 PDT 2009
Hi Indhu,
Thank you so much! It works pretty well on correct input file.
However, if I have 2 rules of b, the parser will stop at the second. It doesn't emit errors as expected. Then it hinders from validation. Any idea about that?
Cheers,
Frank
________________________________________
From: Indhu Bharathi [indhu.b at s7software.com]
Sent: Friday, October 30, 2009 12:36 PM
To: Frank Du; antlr-interest at antlr.org
Subject: RE: [antlr-interest] Please help with a grammar issue
Maybe you can use validating semantic predicate
r
@init {
int cntA=0, cntB=0, cntC=0;
}
: ( a {cntA++;} | b {cntB++;} | c {cntC++;} )+ {cntA>1 && cntB<=1 && cntC==1}?
;
Cheers, Indhu
S7 Software
From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-bounces at antlr.org] On Behalf Of Frank Du
Sent: Friday, October 30, 2009 9:53 PM
To: 'antlr-interest at antlr.org'
Subject: [antlr-interest] Please help with a grammar issue
Dear All,
I have a grammar issue and need your help. Let’s say I have tree rules: a, b, c
Rule a occurs multiple times, rule b occurs one time or none, and rule c occurs one time.
My question is: How to write the grammar, so the rule ordering is arbitrary?
Thank you so much! Have a nice day!
Best Regards,
Frank
More information about the antlr-interest
mailing list