46 lines
1.5 KiB
Racket
46 lines
1.5 KiB
Racket
;;; Copyright 2021 Sergiu Ivanov <sivanov@colimite.fr>
|
|
;;;
|
|
;;; Licensed under the Apache License, Version 2.0 (the "License");
|
|
;;; you may not use this file except in compliance with the License.
|
|
;;; You may obtain a copy of the License at
|
|
;;;
|
|
;;; http://www.apache.org/licenses/LICENSE-2.0
|
|
;;;
|
|
;;; Unless required by applicable law or agreed to in writing, software
|
|
;;; distributed under the License is distributed on an "AS IS" BASIS,
|
|
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
;;; See the License for the specific language governing permissions and
|
|
;;; limitations under the License.
|
|
|
|
#lang typed/racket
|
|
|
|
;https://stackoverflow.com/questions/65386334/racket-generic-graph-library-in-typed-racket
|
|
|
|
(module graph-wrapper racket
|
|
(require (prefix-in g: graph))
|
|
(provide graph?
|
|
directed-graph
|
|
has-edge?
|
|
graphviz)
|
|
|
|
(struct graph (g))
|
|
|
|
(define (directed-graph es [ws #f])
|
|
(graph (g:directed-graph es ws)))
|
|
(define (has-edge? g u v)
|
|
(g:has-edge? (graph-g g) u v))
|
|
(define (graphviz g #:output [output #f] #:colors [colors #f])
|
|
(g:graphviz (graph-g g) #:output output #:colors colors)))
|
|
|
|
(require/typed 'graph-wrapper
|
|
[#:opaque Graph graph?]
|
|
[directed-graph (->* ((Listof (List Any Any))) ((Listof Any)) Graph)]
|
|
[has-edge? (-> Graph Any Any Boolean)]
|
|
[graphviz (->* (Graph)
|
|
(#:output Output-Port
|
|
#:colors (HashTable Any Natural))
|
|
String)])
|
|
|
|
(define g (directed-graph '((a b) (b c))))
|
|
(has-edge? g 'a 'c)
|
|
(graphviz g)
|