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rs: Add union-products.

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This commit is contained in:
Sergiu Ivanov 2020-03-01 19:47:38 +01:00
parent 3732d4897e
commit 86256cd47e
2 changed files with 16 additions and 2 deletions
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3
rs-tests.rkt
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@ -13,4 +13,5 @@
(check-true (enabled? r1 s1)) (check-true (enabled? r1 s1))
(check-false (enabled? r1 s2)) (check-false (enabled? r1 s2))
(check-equal? (list-enabled rs s1) '(a b)) (check-equal? (list-enabled rs s1) '(a b))
(check-equal? (list-enabled rs s2) '(b)))) (check-equal? (list-enabled rs s2) '(b))
(check-equal? (union-products rs '(a b)) (set 'y 'z))))

15
rs.rkt
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@ -10,7 +10,7 @@
;; Type names ;; Type names
Species ReactionSystem Species ReactionSystem
;; Functions ;; Functions
enabled? list-enabled) enabled? list-enabled union-products)
;;; ================= ;;; =================
;;; Basic definitions ;;; Basic definitions
@ -42,3 +42,16 @@
(for/list ([(name reaction) (in-hash rs)] (for/list ([(name reaction) (in-hash rs)]
#:when (enabled? reaction s)) #:when (enabled? reaction s))
name)) name))
;;; Returns the union of the product sets of the given reactions in a
;;; reaction system.
;;;
;;; This function can be seen as producing the result of the
;;; application of the given reactions to a set. Clearly, it does not
;;; check whether the reactions are actually enabled.
(: union-products (-> ReactionSystem (Listof Symbol) (Setof Species)))
(define (union-products rs as)
(apply set-union
((inst set Species)) ; set-union requires at least one argument
(for/list : (Listof (Setof Species))
([a as]) (reaction-products (hash-ref rs a)))))