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fd-neq adds a closure to the constraint store and runs it once on post. After every label binding, fd-fire-store re-runs all stored constraints — when one side of a fd-neq later becomes ground, the domain of the other side has the value removed. Propagator semantics: (number, number) -> equal? fail : ok (number, var) -> remove number from var's domain (var, number) -> symmetric (var, var) -> defer (re-fires after each label step) Pigeonhole-fails test confirms the constraint flow ends correctly: 3 vars all-pairwise-distinct over a 2-element domain has no solutions. 7 new tests, 593/593 cumulative.
83 lines
1.6 KiB
Plaintext
83 lines
1.6 KiB
Plaintext
;; lib/minikanren/tests/clpfd-neq.sx — fd-neq with constraint propagation.
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;; --- ground / domain interaction ---
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(mk-test
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"fd-neq-ground-distinct"
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(run*
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q
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(fresh
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(x)
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(fd-neq x 5)
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(fd-in x (list 4 5 6))
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(fd-label (list x))
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(== q x)))
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(list 4 6))
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(mk-test
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"fd-neq-ground-equal-fails"
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(run* q (fresh (x) (== x 5) (fd-neq x 5) (== q x)))
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(list))
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(mk-test
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"fd-neq-symmetric"
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(run*
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q
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(fresh
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(x)
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(fd-neq 7 x)
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(fd-in x (list 5 6 7 8 9))
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(fd-label (list x))
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(== q x)))
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(list 5 6 8 9))
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;; --- two vars with overlapping domains ---
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(mk-test
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"fd-neq-pair-from-3"
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(let
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((res (run* q (fresh (x y) (fd-in x (list 1 2 3)) (fd-in y (list 1 2 3)) (fd-neq x y) (fd-label (list x y)) (== q (list x y))))))
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(= (len res) 6))
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true)
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(mk-test
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"fd-all-distinct-3-of-3"
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(let
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((res (run* q (fresh (a b c) (fd-in a (list 1 2 3)) (fd-in b (list 1 2 3)) (fd-in c (list 1 2 3)) (fd-neq a b) (fd-neq a c) (fd-neq b c) (fd-label (list a b c)) (== q (list a b c))))))
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(= (len res) 6))
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true)
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(mk-test
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"fd-pigeonhole-fails"
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(run*
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q
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(fresh
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(a b c)
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(fd-in a (list 1 2))
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(fd-in b (list 1 2))
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(fd-in c (list 1 2))
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(fd-neq a b)
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(fd-neq a c)
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(fd-neq b c)
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(fd-label (list a b c))
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(== q (list a b c))))
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(list))
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;; --- propagation when one side becomes ground ---
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(mk-test
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"fd-neq-propagates-after-ground"
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(run*
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q
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(fresh
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(x y)
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(fd-in x (list 1 2 3))
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(fd-in y (list 1 2 3))
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(fd-neq x y)
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(== x 2)
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(fd-label (list y))
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(== q y)))
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(list 1 3))
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(mk-tests-run!)
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