37 lines
971 B
Racket
37 lines
971 B
Racket
#lang racket/base
|
|
;; State Change Notifications, and assorted protocol constructors
|
|
|
|
(provide (struct-out scn)
|
|
lift-scn
|
|
drop-scn
|
|
strip-scn
|
|
label-scn)
|
|
|
|
(require racket/set)
|
|
(require racket/match)
|
|
(require "../trie.rkt")
|
|
(require "../patch.rkt")
|
|
(require "../pretty.rkt")
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
;; State Change Notifications
|
|
(struct scn (trie) #:transparent
|
|
#:methods gen:syndicate-pretty-printable
|
|
[(define (syndicate-pretty-print d [p (current-output-port)])
|
|
(pretty-print-trie (scn-trie d) p))])
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
(define (lift-scn s)
|
|
(scn (pattern->trie '<lift-scn> (at-meta (embedded-trie (scn-trie s))))))
|
|
|
|
(define (drop-scn s)
|
|
(scn (drop-interests (scn-trie s))))
|
|
|
|
(define (strip-scn s)
|
|
(scn (strip-interests (scn-trie s))))
|
|
|
|
(define (label-scn s label)
|
|
(scn (label-interests (scn-trie s) label)))
|