Thanks, Ron, for the inspiration. After scanning your code I realized that this situation is even easier. All I need to do is when I hit the point where I want to tell these apart (both productions have the same token at this point), that I can recognize anything I want with lexeme_read, so I just need to decide whether I want to recognize this parse or the other. I don't even have to get into resolving ambiguous parses.
And I found that I can put the "no output parentheses" even around non-explicit lexical elements, so my little check above does not even end up in the parse tree. On Saturday, August 11, 2018 at 12:08:45 AM UTC-5, Thomas Weigert wrote: > > Sorry for the following beginner's question.... > > I have an ambiguous grammar which I would like to resolve during parsing. > > I arranged for an event to be triggered when I have seen enough so that I > can make a decision whether the current production will be the right one > (by considering context). I would like to in the event handler either > accept this lexeme (when I determine that this production is the correct > one) or reject this lexeme (when I determine that this production is the > wrong one). If I reject this lexeme, I hope that marpa will go on to try > the other production which will now be the correct one. > > Is this something reasonable to want to accomplish? If so, is there any > example I could emulate for this behavior. It is easy to accept the lexeme, > but I am having a hard time figuring out how to reject it and continue > trying. > > Thanks for any suggestions. > -- You received this message because you are subscribed to the Google Groups "marpa parser" group. To unsubscribe from this group and stop receiving emails from it, send an email to marpa-parser+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
