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Pattern grammar: _, symbol, atom (number/string/keyword/bool), (), and (p1 ... pn) list patterns (recursive). Symbols become fresh vars in a fresh form, atoms become literals to unify against, lists recurse position-wise. Repeated names produce the same fresh var (so they unify by ==). Macro is built with explicit cons/list rather than a quasiquote because the quasiquote expander does not recurse into nested lambda bodies — the natural `\`(matche-clause (quote ,target) cl)` spelling left literal `(unquote target)` forms in the output. 14 tests, 222/222 cumulative. Phase 5 done (project, conda, condu, onceo, nafc, matche all green).
139 lines
2.4 KiB
Plaintext
139 lines
2.4 KiB
Plaintext
;; lib/minikanren/tests/matche.sx — Phase 5 piece D tests for `matche`.
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;; --- literal patterns ---
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(mk-test
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"matche-literal-number"
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(run* q (matche q (1 (== q 1))))
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(list 1))
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(mk-test
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"matche-literal-string"
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(run* q (matche q ("hello" (== q "hello"))))
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(list "hello"))
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(mk-test
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"matche-literal-no-clause-matches"
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(run*
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q
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(matche 7 (1 (== q :a)) (2 (== q :b))))
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(list))
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;; --- variable patterns ---
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(mk-test
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"matche-symbol-pattern"
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(run* q (fresh (x) (== x 99) (matche x (a (== q a)))))
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(list 99))
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(mk-test
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"matche-wildcard"
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(run* q (fresh (x) (== x 7) (matche x (_ (== q :any)))))
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(list :any))
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;; --- list patterns ---
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(mk-test
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"matche-empty-list"
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(run* q (matche (list) (() (== q :ok))))
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(list :ok))
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(mk-test
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"matche-pair-binds"
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(run*
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q
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(fresh
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(x)
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(== x (list 1 2))
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(matche x ((a b) (== q (list b a))))))
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(list (list 2 1)))
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(mk-test
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"matche-triple-binds"
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(run*
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q
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(fresh
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(x)
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(== x (list 1 2 3))
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(matche x ((a b c) (== q (list :sum a b c))))))
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(list (list :sum 1 2 3)))
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(mk-test
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"matche-mixed-literal-and-var"
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(run*
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q
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(fresh
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(x)
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(== x (list 1 99 3))
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(matche x ((1 m 3) (== q m)))))
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(list 99))
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;; --- multi-clause dispatch ---
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(mk-test
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"matche-multi-clause-shape"
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(run*
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q
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(fresh
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(x)
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(== x (list 5 6))
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(matche
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x
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(() (== q :empty))
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((a) (== q (list :one a)))
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((a b) (== q (list :two a b))))))
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(list (list :two 5 6)))
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(mk-test
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"matche-three-shapes-via-fresh"
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(run*
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q
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(fresh
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(x)
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(matche
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x
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(() (== q :empty))
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((a) (== q (list :one a)))
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((a b) (== q (list :two a b))))))
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(list
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:empty (list :one (make-symbol "_.0"))
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(list :two (make-symbol "_.0") (make-symbol "_.1"))))
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;; --- nested patterns ---
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(mk-test
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"matche-nested"
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(run*
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q
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(fresh
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(x)
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(==
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x
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(list (list 1 2) (list 3 4)))
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(matche x (((a b) (c d)) (== q (list a b c d))))))
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(list (list 1 2 3 4)))
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;; --- repeated var names create the same fresh var → must unify ---
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(mk-test
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"matche-repeated-var-implies-equality"
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(run*
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q
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(fresh
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(x)
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(== x (list 7 7))
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(matche x ((a a) (== q a)))))
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(list 7))
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(mk-test
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"matche-repeated-var-mismatch-fails"
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(run*
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q
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(fresh
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(x)
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(== x (list 7 8))
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(matche x ((a a) (== q a)))))
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(list))
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(mk-tests-run!)
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