960d8b6e24
natives-parity.ss was a grab-bag (its own header called it 'parity'). Dissolve it
into homes that say what they hold:
- cat -> natives-transduce.ss (was natives-xform.ss, renamed for the
whole transducer surface: volatiles + cat + transduce/sequence)
- transient? -> transients.ss
- rseq -> natives-seq.ss
- hash family -> natives-misc.ss (the public hash API over jolt-hash)
The remainder — the #?() feature set, the reader-conditional + re-matcher tagged-map
ctors, and macroexpand — is a coherent reader/macro runtime-support unit, kept as
natives-reader.ss (np- prefix -> nr-). rt.ss loads + two comment refs updated.
Runtime .ss, no re-mint. make test green; hash/transient?/rseq/cat/macroexpand and
#?() reader features all verified.
63 lines
3 KiB
Scheme
63 lines
3 KiB
Scheme
;; natives-transduce.ss — the transducer surface: volatiles, the `cat` transducer,
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;; and sequence / transduce application.
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;;
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;; `sequence` and `transduce` are seed natives. The stateful transducer arities
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;; (take-nth/map-indexed/partition-by/dedupe/distinct, all overlay) use
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;; volatile!/vswap!/vreset!/deref, shimmed here.
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;;
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;; Volatiles are a native mutable box (jvol) — the overlay vreset!/vswap! drive a
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;; volatile through jolt.host/ref-put!+get, but a Chez volatile is a record, not a
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;; tagged table, so those overlay versions are overridden natively in
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;; post-prelude.ss. transduce/sequence build on the existing into-xform / reduce-
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;; seq machinery (natives-seq.ss / seq.ss). Loaded after those + atoms.ss (deref).
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;; --- volatiles ---------------------------------------------------------------
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(define-record-type jvol (fields (mutable v)) (nongenerative chez-jvol-v1))
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(define (jolt-volatile! x) (make-jvol x))
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(define (jolt-vreset! vol x) (jvol-v-set! vol x) x)
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(define (jolt-vswap! vol f . args)
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(let ((nv (apply jolt-invoke f (jvol-v vol) args))) (jvol-v-set! vol nv) nv))
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(define (jolt-volatile-pred? x) (jvol? x))
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;; deref reads a volatile too (partition-all/-by transducers @-deref their box).
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(define %xf-deref jolt-deref)
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(set! jolt-deref (lambda (x) (if (jvol? x) (jvol-v x) (%xf-deref x))))
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(def-var! "clojure.core" "volatile!" jolt-volatile!)
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(def-var! "clojure.core" "deref" jolt-deref)
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;; --- transduce / sequence ----------------------------------------------------
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;; (transduce xform f coll) / (transduce xform f init coll): build the transformed
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;; reducing fn (xform f), reduce it over coll (reduce-seq honors `reduced`), then
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;; run the completion (1-arg) arity. The 3-arg init defaults to (f) — the rf's
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;; 0-arity, e.g. (+) = 0, (conj) = [].
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(define jolt-transduce
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(case-lambda
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((xform f coll) (jolt-transduce xform f (jolt-invoke f) coll))
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((xform f init coll)
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(let* ((xf (jolt-invoke xform f))
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(res (reduce-seq xf init (jolt-seq coll))))
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(jolt-invoke xf res)))))
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;; (sequence coll) -> a seq; (sequence xform coll) -> coll transformed by xform.
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;; Materialized eagerly through into-xform then seq'd (corpus inputs are finite; a
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;; fully-lazy pull is future work). Honors reduced via into-xform/reduce-seq.
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(define jolt-sequence
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(case-lambda
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((coll) (jolt-seq coll))
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((xform coll) (jolt-seq (into-xform (jolt-vector) xform coll)))))
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(def-var! "clojure.core" "transduce" jolt-transduce)
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(def-var! "clojure.core" "sequence" jolt-sequence)
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;; --- cat ---------------------------------------------------------------------
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;; cat transducer: each input item is itself a collection, concatenated into the
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;; downstream reducing fn.
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(define (jolt-cat rf)
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(lambda a
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(cond
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((null? a) (jolt-invoke rf))
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((null? (cdr a)) (jolt-invoke rf (car a)))
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(else
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(let loop ((xs (seq->list (jolt-seq (cadr a)))) (acc (car a)))
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(if (null? xs) acc (loop (cdr xs) (jolt-invoke rf acc (car xs)))))))))
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(def-var! "clojure.core" "cat" jolt-cat)
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