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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.
59 lines
1.7 KiB
Plaintext
59 lines
1.7 KiB
Plaintext
;; lib/minikanren/condu.sx — Phase 2 piece D: `condu` and `onceo`.
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;;
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;; Both are commitment forms (no backtracking into discarded options):
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;;
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;; (onceo g) — succeeds at most once: takes the first answer
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;; stream-take produces from (g s).
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;;
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;; (condu (g0 g ...) (h0 h ...) ...)
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;; — first clause whose head goal succeeds wins; only
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;; the first answer of the head is propagated to the
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;; rest of that clause; later clauses are not tried.
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;; (Reasoned Schemer chapter 10; Byrd 5.4.)
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(define
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onceo
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(fn
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(g)
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(fn
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(s)
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(let
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((peek (stream-take 1 (g s))))
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(if (empty? peek) mzero (unit (first peek)))))))
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;; condu-try — runtime walker over a list of clauses (each clause a list of
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;; goals). Forces the head with stream-take 1; if head fails, recurse to
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;; the next clause; if head succeeds, commits its single answer through
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;; the rest of the clause.
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(define
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condu-try
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(fn
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(clauses s)
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(cond
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((empty? clauses) mzero)
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(:else
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(let
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((cl (first clauses)))
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(let
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((head-goal (first cl)) (rest-goals (rest cl)))
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(let
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((peek (stream-take 1 (head-goal s))))
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(if
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(empty? peek)
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(condu-try (rest clauses) s)
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((mk-conj-list rest-goals) (first peek))))))))))
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(defmacro
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condu
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(&rest clauses)
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(quasiquote
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(fn
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(s)
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(condu-try
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(list
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(splice-unquote
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(map
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(fn (cl) (quasiquote (list (splice-unquote cl))))
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clauses)))
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s))))
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