[Moose-dev] Re: epsilon parser not

Hi, On 5 Aug 2010, at 08:24, Lukas Renggli wrote: I tried this one, but the problem is that caseInsensitive is not understood by all parser (and in particular by PPChoiceParser), so I cannot write: keywords reduce: [ :a :b | a asParser caseInsensitive / b asParser caseInsensitive ] Aha, i missed that part. What about (keywords collect: [ :k | k asParser caseInsensitive ]) reduce: #/ Yes, that would work. In this case, inject:into: can be a choice, but indeed with the current implementation we get one parser too many in the choice. Now the question is if it would not make sense to implement: PPFailingParser>>/ aParser       ^ aParser That's a bit ugly :-) Why? Is it because you want to preserve the structure of parsers? I would just like to have the equivalent of 0 for addition and 1 for multiplication. Perhaps we can introduce another Parser class, but still I think it would make sense.

Cheers, Doru Lukas ? Like this you can inject it in a collection without creating an extra parser at the beginning. In the same spirit, we could also implement PPEpsilonParser>>, in a similar way. Is there an argument against that? Cheers, Doru for a shorter and more performant implementation. Lukas On Wednesday, August 4, 2010, Tudor Girba <tudor.girba(a)gmail.com> wrote: Hi, I went quickly through the PetitJava implementation and I stumbled across the keywords implementation. I would propose a simpler solution: keyword      ^ (arrayOfKeywords inject: PPEpsilonParser new not into: [:p :key | p / key asParser ]) token trimBlanks . Now the question is if it makes sense to have a separate parser class equivalent to PPEpsilonParser new not. If yes, what would a good name be? Cheers, Doru -- www.tudorgirba.com "Speaking louder won't make the point worthier." _______________________________________________ Moose-dev mailing list Moose-dev(a)iam.unibe.ch https://www.iam.unibe.ch/mailman/listinfo/moose-dev -- Lukas Renggli www.lukas-renggli.ch _______________________________________________ Moose-dev mailing list Moose-dev(a)iam.unibe.ch https://www.iam.unibe.ch/mailman/listinfo/moose-dev -- www.tudorgirba.com "To lead is not to demand things, it is to make them happen." _______________________________________________ Moose-dev mailing list Moose-dev(a)iam.unibe.ch https://www.iam.unibe.ch/mailman/listinfo/moose-dev -- Lukas Renggli www.lukas-renggli.ch _______________________________________________ Moose-dev mailing list Moose-dev(a)iam.unibe.ch https://www.iam.unibe.ch/mailman/listinfo/moose-dev -- www.tudorgirba.com "Value is always contextual." _______________________________________________ Moose-dev mailing list Moose-dev(a)iam.unibe.ch https://www.iam.unibe.ch/mailman/listinfo/moose-dev