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04-only-members.scm
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(load "mk.scm")
(load "mkextraforms.scm")
(load "03-seeing-old-friends-in-new-ways.scm")
(define S succeed)
(define U fail)
(define memo
(lambda (x l out)
(conde
((nullo l) U)
((eq-caro l x) (== l out))
(else
(fresh (ll)
(cdro l ll)
(memo x ll out))))))
(run 1 (out)
(memo 'tofu '(a b tofu d tofu e) out))
;; '((tofu d tofu e))
(run 1 (out)
(fresh (x)
(memo 'tofu (list 'a 'b x 'd 'tofu 'e) out)))
;; '((tofu d tofu e))
(run* (r)
(memo r
'(a b tofu d tofu e)
'(tofu d tofu e))) ;; '(tofu)
(run* (q)
(memo 'tofu '(tofu e) '(tofu e))
(== #t q)) ;; (#t)
(run* (q)
(memo 'tofu '(tofu e) '(tofu))
(== #t q)) ;; ()
(run* (x)
(memo 'tofu '(tofu e) (list x 'e)))
;; '(tofu)
(run* (x)
(memo 'tofu '(tofu e) (list 'peas x)))
;; ()
(run* (out)
(fresh (x)
(memo 'tofu (list 'a 'b x 'd 'tofu 'e) out)))
;; '(('tofu 'd 'tofu 'e) ('tofu 'e))
(run 12 (z)
(fresh (u)
(memo
'tofu
(append '(a b tofu d tofu)
(cons 'e z))
u)))
;; _.0
;; _.0
;; '(tofu . _.0)
;; '(_.0 tofu . _.1)
;; '(_.0 _.1 tofu . _.2)
;; and so on...
(define rembero
(lambda (x l out)
(conde
((nullo l) (== () out))
((eq-caro l x) (cdro l out))
((fresh (res)
(fresh (d)
(cdro l d)
(rembero x d res))
(fresh (a)
(caro l a)
(conso a res out)))))))
; (define rembero
; (lambda (x l out)
; (conde
; ((nullo l) (== '() out))
; ((eq-caro l x) (cdro l out))
; (else
; (fresh (a d res)
; (conso a d l)
; (rembero x d res)
; (conso a res out))))))
(run 1 (out)
(fresh (y)
(rembero 'peas
(list 'a 'b y 'd 'peas 'e) out)))
;; '(a b d peas e)
(run* (out)
(fresh (y z)
(rembero y (list 'a 'b y 'd z 'e) out)))
;; ('b 'a 'd _.0 'e)
;; ('a 'b 'd _.0 'e)
;; ('a 'b 'd _.0 'e)
;; ('a 'b 'd _.0 'e)
;; ('a 'b _.0 'd 'e)
;; ('a 'b 'e 'd _.0)
;; ('a 'b _.0 'd _.1 'e)
(run* (r)
(fresh (y z)
(rembero y
(list y 'd z 'e)
(list y 'd 'e))
(== (list y z) r)))
;; ('d 'd)
;; ('d 'd)
;; (_.0 _.0)
;; ('e 'e)
(run 13 (w)
(fresh (y z out)
(rembero
y
(append (list 'a 'b y 'd)
(cons z w))
out)))
;; _.0
;; _.0
;; _.0
;; _.0
;; _.0
;; ()
;; (_.0 . _.1)
;; (_.0 . ())
;; (_.0 _.1 . _.2)
;; (_.0 _.1 . ())
;; (_.0 _.1 _.2 . _.3)
;; (_.0 _.1 _.2 . ())
;; and so on.
(define surpriseo
(lambda (s)
(rembero s '(a b c) '(a b c))))
(run* (r)
(== 'd r)
(surpriseo r))
;; '((a b c))
(run* (r)
(surpriseo r)) ;; (_.0)
(run* (r)
(surpriseo r)
(== r 'a))