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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.
43 lines
1.2 KiB
Plaintext
43 lines
1.2 KiB
Plaintext
;; lib/minikanren/conda.sx — Phase 5 piece A: `conda`, the soft-cut.
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;;
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;; (conda (g0 g ...) (h0 h ...) ...)
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;; — first clause whose head g0 produces ANY answer wins; ALL of g0's
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;; answers are then conj'd with the rest of that clause; later
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;; clauses are NOT tried.
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;; — differs from condu only in not wrapping g0 in onceo: condu
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;; commits to the SINGLE first answer, conda lets the head's full
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;; answer-set flow into the rest of the clause.
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;; (Reasoned Schemer chapter 10; Byrd 5.3.)
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(define
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conda-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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(conda-try (rest clauses) s)
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(mk-bind (head-goal s) (mk-conj-list rest-goals))))))))))
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(defmacro
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conda
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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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(conda-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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