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Squash merge of 76 commits from loops/minikanren. Adds lib/minikanren/ — a complete miniKanren-on-SX implementation built on top of lib/guest/match.sx, validating the lib-guest unify-and-match kit as intended. Modules (20 .sx files, ~1700 LOC): unify, stream, goals, fresh, conde, condu, conda, run, relations, peano, intarith, project, nafc, matche, fd, queens, defrel, clpfd, tabling Phases 1–5 fully done (core miniKanren API, all classic relations, matche, conda, project, nafc). Phase 6 — native CLP(FD): domain primitives, fd-in / fd-eq / fd-neq / fd-lt / fd-lte / fd-plus / fd-times / fd-distinct / fd-label, with constraint reactivation iterating to fixed point. N-queens via FD: 4-queens 2 solutions, 5-queens 10 solutions (vs naive timeout past N=4). Phase 7 — naive ground-arg tabling: table-1 / table-2 / table-3. Fibonacci canary: tab-fib(25) = 75025 in seconds, naive fib(25) times out at 60s. Ackermann via table-3: A(3,3) = 61. 71 test files, 644+ tests passing across the suite. Producer/consumer SLG (cyclic patho, mutual recursion) deferred — research-grade work. The lib-guest validation experiment is conclusive: lib/minikanren/ unify.sx adds ~50 lines of local logic (custom cfg, deep walk*, fresh counter) over lib/guest/match.sx's ~100-line kit. The kit earns its keep ~3× by line count.
52 lines
1.3 KiB
Plaintext
52 lines
1.3 KiB
Plaintext
;; lib/minikanren/peano.sx — Peano-encoded natural-number relations.
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;;
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;; Same encoding as `lengtho`: zero is the keyword `:z`; successors are
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;; `(:s n)`. So 3 = `(:s (:s (:s :z)))`. `(:z)` and `(:s ...)` are normal
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;; SX values that unify positionally — no special primitives needed.
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;;
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;; Peano arithmetic is the canonical miniKanren way to test addition /
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;; multiplication / less-than relationally without an FD constraint store.
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;; (CLP(FD) integers come in Phase 6.)
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(define zeroo (fn (n) (== n :z)))
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(define succ-of (fn (n m) (== m (list :s n))))
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(define
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pluso
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(fn
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(a b c)
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(conde
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((== a :z) (== b c))
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((fresh (a-1 c-1) (== a (list :s a-1)) (== c (list :s c-1)) (pluso a-1 b c-1))))))
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(define minuso (fn (a b c) (pluso b c a)))
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(define lteo (fn (a b) (fresh (k) (pluso a k b))))
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(define lto (fn (a b) (fresh (sa) (succ-of a sa) (lteo sa b))))
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(define
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eveno
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(fn
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(n)
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(conde
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((== n :z))
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((fresh (m) (== n (list :s (list :s m))) (eveno m))))))
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(define
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oddo
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(fn
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(n)
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(conde
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((== n (list :s :z)))
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((fresh (m) (== n (list :s (list :s m))) (oddo m))))))
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(define
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*o
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(fn
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(a b c)
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(conde
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((== a :z) (== c :z))
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((fresh (a-1 ab-1) (== a (list :s a-1)) (*o a-1 b ab-1) (pluso b ab-1 c))))))
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