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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.
77 lines
2.4 KiB
Plaintext
77 lines
2.4 KiB
Plaintext
;; lib/minikanren/matche.sx — Phase 5 piece D: pattern matching over terms.
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;;
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;; (matche TARGET
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;; (PATTERN1 g1 g2 ...)
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;; (PATTERN2 g1 ...)
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;; ...)
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;;
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;; Pattern grammar:
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;; _ wildcard — fresh anonymous var
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;; x plain symbol — fresh var, bind by name
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;; ATOM literal (number, string, boolean) — must equal
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;; :keyword keyword literal — emitted bare (keywords self-evaluate
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;; to their string name in SX, so quoting them changes
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;; their type from string to keyword)
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;; () empty list — must equal
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;; (p1 p2 ... pn) list pattern — recurse on each element
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;;
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;; The macro expands to a `conde` whose clauses are
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;; `((fresh (vars-in-pat) (== target pat-expr) body...))`.
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;;
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;; Repeated symbol names within a pattern produce the same fresh var, so
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;; they unify by `==`. Fixed-length list patterns only — head/tail
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;; destructuring uses `(fresh (a d) (conso a d target) body)` directly.
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;;
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;; Note: the macro builds the expansion via `cons` / `list` rather than a
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;; quasiquote — quasiquote does not recurse into nested lambda bodies in
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;; SX, so `\`(matche-clause (quote ,target) cl)` left literal
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;; `(unquote target)` in the output.
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(define matche-symbol-var? (fn (s) (symbol? s)))
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(define
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matche-collect-vars-acc
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(fn
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(pat acc)
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(cond
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((matche-symbol-var? pat)
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(if (some (fn (s) (= s pat)) acc) acc (append acc (list pat))))
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((and (list? pat) (not (empty? pat)))
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(reduce (fn (a p) (matche-collect-vars-acc p a)) acc pat))
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(:else acc))))
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(define
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matche-collect-vars
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(fn (pat) (matche-collect-vars-acc pat (list))))
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(define
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matche-pattern->expr
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(fn
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(pat)
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(cond
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((matche-symbol-var? pat) pat)
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((and (list? pat) (empty? pat)) (list (quote list)))
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((list? pat) (cons (quote list) (map matche-pattern->expr pat)))
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((keyword? pat) pat)
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(:else (list (quote quote) pat)))))
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(define
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matche-clause
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(fn
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(target cl)
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(let
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((pat (first cl)) (body (rest cl)))
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(let
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((vars (matche-collect-vars pat)))
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(let
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((pat-expr (matche-pattern->expr pat)))
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(list
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(cons
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(quote fresh)
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(cons vars (cons (list (quote ==) target pat-expr) body)))))))))
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(defmacro
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matche
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(target &rest clauses)
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(cons (quote conde) (map (fn (cl) (matche-clause target cl)) clauses)))
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