Ticket #500 (new enhancement)

Opened 11 years ago

Request for adding parser combinator "zero"

Reported by: anonymous Owned by: bzlib
Priority: major Milestone:
Component: bzlib/parseq.plt Keywords:
Cc: Version: (1 3)
Racket Version:


The library would benefit from having a parser combinator that succeeds if the parser given as a parameter fails. As far as I can tell, the implementation would be:

(define (zero parser)

(lambda (in)


(((v in) ((literal parser) in)))
((if (failed? v) (return '()) fail) in))))

Note: See TracTickets for help on using tickets.