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(project (vars ...) goal ...) defmacro walks each named var via mk-walk*, rebinds them in the body's lexical scope, then mk-conjs the body goals on the same substitution. Hygienic — gensym'd s-param so user vars survive. Lets you reach into host SX for arithmetic, string ops, anything that needs a ground value: (project (n) (== q (* n n))), (project (s) (== q (str s \"!\"))), and so on. 6 new tests, 194/194 cumulative.
61 lines
1.1 KiB
Plaintext
61 lines
1.1 KiB
Plaintext
;; lib/minikanren/tests/project.sx — Phase 5 piece B tests for `project`.
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;; --- project rebinds vars to ground values for SX use ---
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(mk-test
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"project-square-via-host"
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(run* q (fresh (n) (== n 5) (project (n) (== q (* n n)))))
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(list 25))
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(mk-test
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"project-multi-vars"
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(run*
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q
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(fresh
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(a b)
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(== a 3)
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(== b 4)
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(project (a b) (== q (+ a b)))))
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(list 7))
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(mk-test
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"project-with-string-host-op"
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(run* q (fresh (s) (== s "hello") (project (s) (== q (str s "!")))))
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(list "hello!"))
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;; --- project nested inside conde ---
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(mk-test
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"project-inside-conde"
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(run*
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q
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(fresh
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(n)
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(conde ((== n 3)) ((== n 4)))
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(project (n) (== q (* n 10)))))
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(list 30 40))
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;; --- project body can be multiple goals (mk-conj'd) ---
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(mk-test
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"project-multi-goal-body"
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(run*
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q
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(fresh
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(n)
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(== n 7)
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(project (n) (== q (+ n 1)) (== q (+ n 1)))))
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(list 8))
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(mk-test
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"project-multi-goal-body-conflict"
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(run*
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q
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(fresh
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(n)
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(== n 7)
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(project (n) (== q (+ n 1)) (== q (+ n 2)))))
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(list))
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(mk-tests-run!)
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