Hi David, Try this:
(ID GETS) => ID GETS expr SEMI? -> ^(GETS ID expr SEMI?) Regards, Bart. On Tue, Jun 7, 2011 at 1:41 PM, David Smith <david.sm...@cc.gatech.edu>wrote: > I'm parsing a grammar in which the semicolon on the end of a line is > optional. So two of the statement rules might be: > | (ID GETS expr SEMI) => ID GETS expr SEMI -> ^(GETS ID expr SEMI) > | (ID GETS) => ID GETS expr -> ^(GETS ID expr) > Since this occurs with a number of different assignment statements, I > would really like to collapse this into one rule that looks something > like this: > | (ID GETS) => ID GETS e=expr (s=SEMI)? -> ^(GETS ID $e $s) > but every implementation I can think of either refuses to generate > the grammar or, as in the case above, generates the grammar but > decides that the variable 's' is unknown. > Is there a any way to achieve this? > > DMS > > David M. Smith http://www.cc.gatech.edu/fac/David.Smith > Georgia Institute of Technology, College of Computing > Sent from my ASR-33 Teletype > > > 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 il-antlr-inter...@googlegroups.com. To unsubscribe from this group, send email to il-antlr-interest+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/il-antlr-interest?hl=en.
