Hey, you can achieve your goal by extending the petit parser API as follows;
PPParser>>nullParser " transforms whatever result to null " ^ self ==> [:e | NullResult instance ]
PPParser>>ignoreNulls " removes NullResults from result " ^ self ==> [:e | e isCollection ifTrue: [ e reject: [ :item | item isNullResult ] ifFalse: [ e ] ]
Cheers, Jan
On Mon, Jun 22, 2015 at 1:27 PM Peter Uhnák i.uhnak@gmail.com wrote:
The problem is, that in syntax there are often many symbols that are no longer needed once the string is parsed so I want to get rid of them.
For example imagine a string representation of an JSON array:
'[ 1, 2, 3 ]'
Once the string is parsed, the brackets are no longer needed so I can get rid of them with a block
MyJsonParser>>array ^ ($[ asParser, arrayElements, $] asParser) ==> [ :nodes | nodes second ]
This way the result of the array will not contain those $[ $] symbols because I am not interested in them after the parsing.
So, I would prefer to explicitly state that I am not interested in certain parser after it has done its job.
MyJsonParser>>array ^ $[ asParser ignore, arrayElements, $] asParser ignore
(or the other alternative mentioned in the first post)
Is what I am trying to accomplish clearer?
Peter _______________________________________________ Moose-dev mailing list Moose-dev@iam.unibe.ch https://www.iam.unibe.ch/mailman/listinfo/moose-dev