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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.
68 lines
1.5 KiB
Plaintext
68 lines
1.5 KiB
Plaintext
;; lib/minikanren/queens.sx — N-queens via ino + all-distincto + project.
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;;
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;; Encoding: q = (c1 c2 ... cn) where ci is the column of the queen in
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;; row i. Each ci ∈ {1..n}; all distinct (no two queens share a column);
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;; no two queens on the same diagonal (|ci - cj| ≠ |i - j| for i ≠ j).
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;;
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;; The diagonal check uses `project` to escape into host arithmetic
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;; once both column values are ground.
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(define
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safe-diag
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(fn
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(a b dist)
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(project (a b) (if (= (abs (- a b)) dist) fail succeed))))
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(define
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safe-cell-vs-rest
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(fn
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(c c-row others next-row)
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(cond
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((empty? others) succeed)
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(:else
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(mk-conj
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(safe-diag c (first others) (- next-row c-row))
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(safe-cell-vs-rest c c-row (rest others) (+ next-row 1)))))))
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(define
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all-cells-safe
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(fn
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(cols start-row)
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(cond
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((empty? cols) succeed)
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(:else
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(mk-conj
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(safe-cell-vs-rest
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(first cols)
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start-row
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(rest cols)
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(+ start-row 1))
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(all-cells-safe (rest cols) (+ start-row 1)))))))
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(define
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range-1-to-n
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(fn
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(n)
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(cond
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((= n 0) (list))
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(:else (append (range-1-to-n (- n 1)) (list n))))))
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(define
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ino-each
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(fn
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(cols dom)
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(cond
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((empty? cols) succeed)
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(:else (mk-conj (ino (first cols) dom) (ino-each (rest cols) dom))))))
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(define
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queens-cols
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(fn
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(cols n)
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(let
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((dom (range-1-to-n n)))
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(mk-conj
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(ino-each cols dom)
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(all-distincto cols)
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(all-cells-safe cols 1)))))
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