chickadee » prcc » act

Act on the result of the parser, whether it's success or failure.

This allows you to add semantic actions to the parser.

Note: Be sure not to return #f in SUCC-PROC, because that will be filtered out.

Example:

(define a-or-b (sel (char #\a) (char #\b)))
(parse-string "aabba" (rep (act a-or-b (lambda (x) (if (string=? "a" x) 'yes 'no)))))
=> (yes yes no no yes)