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(tako n l prefix) — prefix is the first n elements of l. (dropo n l suffix) — suffix is l after dropping the first n. Both use a Peano natural for the count. Round-trip holds: (tako n l) ⊕ (dropo n l) = l (verified by an end-to-end test) 9 new tests, 368/368 cumulative.
93 lines
1.3 KiB
Plaintext
93 lines
1.3 KiB
Plaintext
;; lib/minikanren/tests/take-drop.sx — Peano-indexed prefix/suffix.
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(define
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mk-nat
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(fn (n) (if (= n 0) :z (list :s (mk-nat (- n 1))))))
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;; --- tako ---
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(mk-test
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"tako-zero"
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(run*
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q
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(tako (mk-nat 0) (list 1 2 3) q))
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(list (list)))
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(mk-test
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"tako-two"
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(run*
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q
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(tako
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(mk-nat 2)
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(list 1 2 3 4 5)
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q))
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(list (list 1 2)))
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(mk-test
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"tako-all"
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(run*
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q
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(tako (mk-nat 3) (list 1 2 3) q))
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(list (list 1 2 3)))
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(mk-test
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"tako-too-many"
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(run*
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q
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(tako (mk-nat 5) (list 1 2 3) q))
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(list))
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;; --- dropo ---
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(mk-test
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"dropo-zero"
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(run*
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q
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(dropo (mk-nat 0) (list 1 2 3) q))
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(list (list 1 2 3)))
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(mk-test
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"dropo-two"
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(run*
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q
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(dropo
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(mk-nat 2)
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(list 1 2 3 4 5)
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q))
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(list (list 3 4 5)))
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(mk-test
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"dropo-all"
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(run*
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q
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(dropo (mk-nat 3) (list 1 2 3) q))
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(list (list)))
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(mk-test
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"dropo-too-many"
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(run*
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q
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(dropo (mk-nat 5) (list 1 2 3) q))
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(list))
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;; --- take + drop round-trip ---
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(mk-test
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"tako-dropo-roundtrip"
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(run*
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q
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(fresh
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(p s)
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(tako
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(mk-nat 2)
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(list 1 2 3 4 5)
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p)
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(dropo
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(mk-nat 2)
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(list 1 2 3 4 5)
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s)
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(appendo p s q)))
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(list (list 1 2 3 4 5)))
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(mk-tests-run!)
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