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ino is membero with the constraint-store-friendly argument order
(`(ino x dom)` reads as "x in dom"). all-distincto checks pairwise
distinctness via nafc + membero on the recursive tail. These two are
enough to express the enumerate-then-filter style of finite-domain
solving:
(fresh (a b c)
(ino a (list 1 2 3)) (ino b (list 1 2 3)) (ino c (list 1 2 3))
(all-distincto (list a b c)))
enumerates all 6 distinct triples from {1, 2, 3}. Full CLP(FD) with
arc-consistency, fd-plus, etc. remains pending under Phase 6 proper.
9 new tests, 237/237 cumulative.
76 lines
1.7 KiB
Plaintext
76 lines
1.7 KiB
Plaintext
;; lib/minikanren/tests/fd.sx — Phase 6 piece A: ino + all-distincto.
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;; --- ino ---
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(mk-test
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"ino-element-in-domain"
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(run* q (ino q (list 1 2 3)))
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(list 1 2 3))
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(mk-test "ino-empty-domain" (run* q (ino q (list))) (list))
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(mk-test
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"ino-singleton-domain"
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(run* q (ino q (list 42)))
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(list 42))
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;; --- all-distincto ---
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(mk-test
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"all-distincto-empty"
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(run* q (all-distincto (list)))
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(list (make-symbol "_.0")))
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(mk-test
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"all-distincto-singleton"
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(run* q (all-distincto (list 1)))
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(list (make-symbol "_.0")))
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(mk-test
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"all-distincto-distinct-three"
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(run* q (all-distincto (list 1 2 3)))
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(list (make-symbol "_.0")))
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(mk-test
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"all-distincto-duplicate-fails"
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(run* q (all-distincto (list 1 2 1)))
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(list))
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(mk-test
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"all-distincto-adjacent-duplicate-fails"
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(run* q (all-distincto (list 1 1 2)))
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(list))
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;; --- ino + all-distincto: classic enumerate-all-permutations ---
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(mk-test
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"fd-puzzle-three-distinct-from-domain"
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(let
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((perms (run* q (fresh (a b c) (== q (list a b c)) (ino a (list 1 2 3)) (ino b (list 1 2 3)) (ino c (list 1 2 3)) (all-distincto (list a b c))))))
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(and
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(= (len perms) 6)
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(and
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(some (fn (p) (= p (list 1 2 3))) perms)
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(and
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(some
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(fn (p) (= p (list 1 3 2)))
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perms)
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(and
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(some
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(fn (p) (= p (list 2 1 3)))
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perms)
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(and
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(some
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(fn (p) (= p (list 2 3 1)))
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perms)
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(and
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(some
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(fn (p) (= p (list 3 1 2)))
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perms)
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(some
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(fn (p) (= p (list 3 2 1)))
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perms))))))))
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true)
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(mk-tests-run!)
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