And turn of the backtracking option of course.. Jim
> -----Original Message----- > From: [email protected] [mailto:antlr-interest- > [email protected]] On Behalf Of Jim Idle > Sent: Wednesday, June 02, 2010 1:11 PM > To: [email protected] > Subject: Re: [antlr-interest] Advice with backtracking/ambiguity > > Remember antlr.markmail.org as it will give you lots of examples of > this. You need: > > fragment DIGITS : ('0'..'9')+ ; > DATE > : DIGITS > ( > (SLASH DIGITS SLASH DIGITS)=> SLASH DIGITS SLASH DIGITS > | {$type = DIGITS; } > ; > > SLASH : '/' ; > > Jim > > > -----Original Message----- > > From: [email protected] [mailto:antlr-interest- > > [email protected]] On Behalf Of Ken Williams > > Sent: Wednesday, June 02, 2010 1:04 PM > > To: [email protected] > > Subject: [antlr-interest] Advice with backtracking/ambiguity > > > > Hi, > > > > Here's a simple grammar demonstrating something I'm working with: > > > > ------------------------------ > > grammar testg; > > > > options { > > backtrack=true; > > memoize=true; > > output=AST; > > } > > > > cite : token+ EOF ; > > > > token : DATE | SLASH | DIGITS ; > > > > DATE : DIGITS SLASH DIGITS SLASH DIGITS ; > > > > WS : ( ' ' | '\t'| '\f' | '\n' | '\r' ) {skip();} ; > > > > SLASH : '/' ; > > DIGITS : ('0'..'9')+ ; > > -------------------------------- > > > > > > As you can see, there's an ambiguity with DATE. What I'm trying to > do > > is to > > use the DATE rule when it can succeed, and use DATE & SLASH > otherwise. > > > > > > List: http://www.antlr.org/mailman/listinfo/antlr-interest > Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your- > email-address List: http://www.antlr.org/mailman/listinfo/antlr-interest Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your-email-address -- You received this message because you are subscribed to the Google Groups "il-antlr-interest" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/il-antlr-interest?hl=en.
