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condu.sx: defmacro `condu` folds clauses through a runtime `condu-try` walker. First clause whose head yields a non-empty stream commits its single first answer; later clauses are not tried. `onceo` is the simpler sibling — stream-take 1 over a goal's output. 10 tests cover: onceo trimming success/failure/conde, condu first-clause wins, condu skips failing heads, condu commits-and-cannot-backtrack to later clauses if the rest of the chosen clause fails. 110/110 cumulative. Phase 2 complete.
87 lines
2.1 KiB
Plaintext
87 lines
2.1 KiB
Plaintext
;; lib/minikanren/tests/condu.sx — Phase 2 piece D tests for `onceo` and `condu`.
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;; --- onceo: at most one answer ---
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(mk-test
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"onceo-single-success-passes-through"
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(let
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((q (mk-var "q")))
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(let
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((res (stream-take 5 ((onceo (== q 7)) empty-s))))
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(map (fn (s) (mk-walk q s)) res)))
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(list 7))
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(mk-test
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"onceo-multi-success-trimmed-to-one"
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(let
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((q (mk-var "q")))
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(let
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((res (stream-take 5 ((onceo (mk-disj (== q 1) (== q 2) (== q 3))) empty-s))))
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(map (fn (s) (mk-walk q s)) res)))
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(list 1))
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(mk-test
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"onceo-failure-stays-failure"
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((onceo (== 1 2)) empty-s)
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(list))
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(mk-test
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"onceo-conde-trimmed"
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(let
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((q (mk-var "q")))
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(let
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((res (stream-take 5 ((onceo (conde ((== q "a")) ((== q "b")))) empty-s))))
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(map (fn (s) (mk-walk q s)) res)))
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(list "a"))
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;; --- condu: first clause with successful head wins ---
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(mk-test
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"condu-first-clause-wins"
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(let
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((q (mk-var "q")))
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(let
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((res (stream-take 10 ((condu ((== q 1)) ((== q 2))) empty-s))))
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(map (fn (s) (mk-walk q s)) res)))
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(list 1))
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(mk-test
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"condu-skips-failing-head"
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(let
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((q (mk-var "q")))
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(let
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((res (stream-take 10 ((condu ((== 1 2)) ((== q 100)) ((== q 200))) empty-s))))
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(map (fn (s) (mk-walk q s)) res)))
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(list 100))
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(mk-test
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"condu-all-fail-empty"
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((condu ((== 1 2)) ((== 3 4)))
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empty-s)
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(list))
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(mk-test "condu-empty-clauses-fail" ((condu) empty-s) (list))
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;; --- condu commits head's first answer; rest-goals can still backtrack
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;; within that committed substitution but cannot revisit other heads. ---
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(mk-test
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"condu-head-onceo-rest-runs"
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(let
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((q (mk-var "q")) (r (mk-var "r")))
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(let
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((res (stream-take 10 ((condu ((mk-disj (== q 1) (== q 2)) (== r 99))) empty-s))))
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(map (fn (s) (list (mk-walk q s) (mk-walk r s))) res)))
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(list (list 1 99)))
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(mk-test
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"condu-rest-goals-can-fail-the-clause"
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(let
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((q (mk-var "q")))
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(let
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((res (stream-take 10 ((condu ((== q 1) (== 2 3)) ((== q 99))) empty-s))))
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(map (fn (s) (mk-walk q s)) res)))
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(list))
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(mk-tests-run!)
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