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rembero (remove-first) uses nafc to gate the skip-element clause so the result is well-defined on ground lists. assoco is alist lookup — runs forward (key -> value) and backward (find keys with a given value). nth-o uses Peano-encoded indices into a list, mirroring lengtho. 13 new tests, 266/266 cumulative.
90 lines
1.5 KiB
Plaintext
90 lines
1.5 KiB
Plaintext
;; lib/minikanren/tests/list-relations.sx — rembero, assoco, nth-o.
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;; --- rembero (remove first occurrence) ---
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(mk-test
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"rembero-element-present"
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(run*
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q
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(rembero 2 (list 1 2 3 2) q))
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(list (list 1 3 2)))
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(mk-test
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"rembero-element-not-present"
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(run* q (rembero 99 (list 1 2 3) q))
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(list (list 1 2 3)))
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(mk-test
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"rembero-empty"
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(run* q (rembero 1 (list) q))
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(list (list)))
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(mk-test
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"rembero-only-element"
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(run* q (rembero 5 (list 5) q))
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(list (list)))
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(mk-test
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"rembero-first-of-many"
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(run*
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q
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(rembero 1 (list 1 2 3 4) q))
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(list (list 2 3 4)))
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;; --- assoco (alist lookup) ---
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(define
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test-pairs
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(list
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(list "alice" 30)
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(list "bob" 25)
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(list "carol" 35)))
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(mk-test
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"assoco-found"
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(run* q (assoco "bob" test-pairs q))
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(list 25))
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(mk-test
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"assoco-first"
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(run* q (assoco "alice" test-pairs q))
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(list 30))
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(mk-test "assoco-missing" (run* q (assoco "dave" test-pairs q)) (list))
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(mk-test
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"assoco-find-keys-with-value"
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(run* q (assoco q test-pairs 25))
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(list "bob"))
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;; --- nth-o (Peano-indexed access) ---
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(mk-test
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"nth-o-zero"
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(run* q (nth-o :z (list 10 20 30) q))
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(list 10))
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(mk-test
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"nth-o-one"
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(run* q (nth-o (list :s :z) (list 10 20 30) q))
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(list 20))
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(mk-test
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"nth-o-two"
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(run*
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q
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(nth-o (list :s (list :s :z)) (list 10 20 30) q))
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(list 30))
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(mk-test
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"nth-o-out-of-range"
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(run*
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q
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(nth-o
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(list :s (list :s (list :s :z)))
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(list 10 20 30)
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q))
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(list))
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(mk-tests-run!)
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