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Three coupled fixes plus a new relations module land together because
each is required for the next: appendo can't terminate without all
three.
1. unify.sx — added (:cons h t) tagged cons-cell shape because SX has no
improper pairs. The unifier treats (:cons h t) and the native list
(h . t) as equivalent. mk-walk* re-flattens cons cells back to flat
lists for clean reification.
2. stream.sx — switched mature stream cells from plain SX lists to a
(:s head tail) tagged shape so a mature head can have a thunk tail.
With the old representation, mk-mplus had to (cons head thunk) which
SX rejects (cons requires a list cdr).
3. conde.sx — wraps each clause in Zzz (inverse-eta delay) for laziness.
Zzz uses (gensym "zzz-s-") for the substitution parameter so it does
not capture user goals that follow the (l s ls) convention. Without
gensym, every relation that uses `s` as a list parameter silently
binds it to the substitution dict.
relations.sx is the new module: nullo, pairo, caro, cdro, conso,
firsto, resto, listo, appendo, membero. 25 new tests.
Canary green:
(run* q (appendo (list 1 2) (list 3 4) q))
→ ((1 2 3 4))
(run* q (fresh (l s) (appendo l s (list 1 2 3)) (== q (list l s))))
→ ((() (1 2 3)) ((1) (2 3)) ((1 2) (3)) ((1 2 3) ()))
(run 3 q (listo q))
→ (() (_.0) (_.0 _.1))
152/152 cumulative.
176 lines
3.0 KiB
Plaintext
176 lines
3.0 KiB
Plaintext
;; lib/minikanren/tests/relations.sx — Phase 4 standard relations.
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;;
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;; Includes the classic miniKanren canaries: appendo forwards / backwards /
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;; bidirectionally, membero, listo enumeration.
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;; --- nullo / pairo ---
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(mk-test
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"nullo-empty-succeeds"
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(run* q (nullo (list)))
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(list (make-symbol "_.0")))
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(mk-test "nullo-non-empty-fails" (run* q (nullo (list 1))) (list))
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(mk-test
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"pairo-non-empty-succeeds"
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(run* q (pairo (list 1 2)))
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(list (make-symbol "_.0")))
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(mk-test "pairo-empty-fails" (run* q (pairo (list))) (list))
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;; --- caro / cdro / firsto / resto ---
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(mk-test
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"caro-extracts-head"
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(run* q (caro (list 1 2 3) q))
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(list 1))
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(mk-test
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"cdro-extracts-tail"
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(run* q (cdro (list 1 2 3) q))
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(list (list 2 3)))
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(mk-test
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"firsto-alias-of-caro"
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(run* q (firsto (list 10 20) q))
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(list 10))
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(mk-test
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"resto-alias-of-cdro"
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(run* q (resto (list 10 20) q))
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(list (list 20)))
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(mk-test
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"caro-cdro-build"
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(run*
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q
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(fresh
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(h t)
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(caro (list 1 2 3) h)
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(cdro (list 1 2 3) t)
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(== q (list h t))))
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(list (list 1 (list 2 3))))
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;; --- conso ---
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(mk-test
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"conso-forward"
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(run* q (conso 0 (list 1 2 3) q))
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(list (list 0 1 2 3)))
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(mk-test
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"conso-extract-head"
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(run*
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q
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(conso
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q
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(list 2 3)
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(list 1 2 3)))
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(list 1))
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(mk-test
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"conso-extract-tail"
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(run* q (conso 1 q (list 1 2 3)))
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(list (list 2 3)))
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;; --- listo ---
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(mk-test
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"listo-empty-succeeds"
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(run* q (listo (list)))
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(list (make-symbol "_.0")))
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(mk-test
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"listo-finite-list-succeeds"
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(run* q (listo (list 1 2 3)))
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(list (make-symbol "_.0")))
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(mk-test
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"listo-enumerates-shapes"
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(run 3 q (listo q))
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(list
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(list)
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(list (make-symbol "_.0"))
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(list (make-symbol "_.0") (make-symbol "_.1"))))
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;; --- appendo: the canary ---
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(mk-test
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"appendo-forward-simple"
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(run*
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q
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(appendo (list 1 2) (list 3 4) q))
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(list (list 1 2 3 4)))
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(mk-test
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"appendo-forward-empty-l"
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(run* q (appendo (list) (list 3 4) q))
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(list (list 3 4)))
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(mk-test
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"appendo-forward-empty-s"
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(run* q (appendo (list 1 2) (list) q))
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(list (list 1 2)))
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(mk-test
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"appendo-recovers-tail"
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(run*
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q
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(appendo
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(list 1 2)
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q
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(list 1 2 3 4)))
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(list (list 3 4)))
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(mk-test
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"appendo-recovers-prefix"
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(run*
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q
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(appendo
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q
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(list 3 4)
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(list 1 2 3 4)))
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(list (list 1 2)))
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(mk-test
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"appendo-backward-all-splits"
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(run*
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q
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(fresh
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(l s)
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(appendo l s (list 1 2 3))
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(== q (list l s))))
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(list
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(list (list) (list 1 2 3))
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(list (list 1) (list 2 3))
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(list (list 1 2) (list 3))
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(list (list 1 2 3) (list))))
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(mk-test
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"appendo-empty-empty-empty"
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(run* q (appendo (list) (list) q))
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(list (list)))
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;; --- membero ---
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(mk-test
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"membero-element-present"
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(run
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1
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q
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(membero 2 (list 1 2 3)))
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(list (make-symbol "_.0")))
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(mk-test
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"membero-element-absent-empty"
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(run* q (membero 99 (list 1 2 3)))
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(list))
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(mk-test
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"membero-enumerates"
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(run* q (membero q (list "a" "b" "c")))
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(list "a" "b" "c"))
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(mk-tests-run!)
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