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lib/minikanren/stream.sx: mzero/unit/mk-mplus/mk-bind/stream-take. Three stream shapes (empty, mature list, immature thunk). mk-mplus suspends and swaps on a paused-left for fair interleaving (Reasoned Schemer style). lib/minikanren/goals.sx: succeed/fail/==/==-check + conj2/disj2 + variadic mk-conj/mk-disj. ==-check is the opt-in occurs-checked variant. Forced-rename note: SX has a host primitive `bind` that silently shadows user-level defines, so all stream/goal operators are mk-prefixed. Recorded in feedback memory. 82/82 tests cumulative (48 unify + 34 goals).
59 lines
1.5 KiB
Plaintext
59 lines
1.5 KiB
Plaintext
;; lib/minikanren/goals.sx — Phase 2 piece B: core goals.
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;;
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;; A goal is a function (fn (s) → stream-of-substitutions).
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;; Goals built here:
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;; succeed — always returns (unit s)
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;; fail — always returns mzero
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;; == — unifies two terms; succeeds with a singleton, else fails
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;; ==-check — opt-in occurs-checked equality
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;; conj2 / mk-conj — sequential conjunction of goals
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;; disj2 / mk-disj — interleaved disjunction of goals (raw — `conde` adds
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;; the implicit-conj-per-clause sugar in a later commit)
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(define succeed (fn (s) (unit s)))
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(define fail (fn (s) mzero))
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(define
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==
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(fn
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(u v)
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(fn
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(s)
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(let ((s2 (mk-unify u v s))) (if (= s2 nil) mzero (unit s2))))))
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(define
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==-check
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(fn
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(u v)
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(fn
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(s)
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(let ((s2 (mk-unify-check u v s))) (if (= s2 nil) mzero (unit s2))))))
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(define conj2 (fn (g1 g2) (fn (s) (mk-bind (g1 s) g2))))
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(define disj2 (fn (g1 g2) (fn (s) (mk-mplus (g1 s) (g2 s)))))
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;; Fold goals in a list. (mk-conj-list ()) ≡ succeed; (mk-disj-list ()) ≡ fail.
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(define
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mk-conj-list
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(fn
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(gs)
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(cond
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((empty? gs) succeed)
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((empty? (rest gs)) (first gs))
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(:else (conj2 (first gs) (mk-conj-list (rest gs)))))))
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(define
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mk-disj-list
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(fn
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(gs)
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(cond
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((empty? gs) fail)
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((empty? (rest gs)) (first gs))
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(:else (disj2 (first gs) (mk-disj-list (rest gs)))))))
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(define mk-conj (fn (&rest gs) (mk-conj-list gs)))
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(define mk-disj (fn (&rest gs) (mk-disj-list gs)))
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