1826c8b3e9
transient/persistent!/conj!/assoc!/dissoc!/disj!/pop! as copy-on-write over the persistent collections (host/chez/transients.ss) — each op rebuilds the persistent coll (no in-place perf) but the semantics match, so into/frequencies/group-by work. Adds persistent disj over pset-disj. get/count/contains? are redefined to see through a transient (frequencies and group-by both do (get tm k) on a transient map); vector? on a transient vector is false, which group-by relies on. Prelude parity 1326 -> 1382/2497, 0 new divergences. emit-test exercises the direct transient ops via run-prelude and the overlay users (frequencies/group-by/into) end-to-end through the bin/jolt-chez -e binary.
73 lines
3.1 KiB
Scheme
73 lines
3.1 KiB
Scheme
;; transients (jolt-kl2l) — copy-on-write over the persistent collections.
|
|
;;
|
|
;; A first cut: each transient op rebuilds the persistent collection (no in-place
|
|
;; mutation perf), but the SEMANTICS match — the overlay's transient users (into,
|
|
;; frequencies, group-by) get correct results. get/count/contains? are extended to
|
|
;; see THROUGH a transient to its held collection (frequencies/group-by do
|
|
;; (get tm k) on a transient map). vector? on a transient vector is false (it's a
|
|
;; jolt-transient record, not a pvec), which group-by relies on. Loaded after
|
|
;; collections.ss (the persistent ops it delegates to) and converters.ss.
|
|
|
|
(define-record-type jolt-transient (fields (mutable coll) (mutable active))
|
|
(nongenerative jolt-transient-v1))
|
|
|
|
(define (jolt-transient-new coll) (make-jolt-transient coll #t))
|
|
|
|
(define (jolt-trans-check t who)
|
|
(unless (jolt-transient? t) (error #f (string-append who ": not a transient") t))
|
|
(unless (jolt-transient-active t)
|
|
(error #f (string-append who ": transient used after persistent!"))))
|
|
|
|
(define (jolt-persistent! t)
|
|
(jolt-trans-check t "persistent!")
|
|
(jolt-transient-active-set! t #f)
|
|
(jolt-transient-coll t))
|
|
|
|
(define (jolt-conj! t . xs)
|
|
(jolt-trans-check t "conj!")
|
|
(jolt-transient-coll-set! t (apply jolt-conj (jolt-transient-coll t) xs))
|
|
t)
|
|
(define (jolt-assoc! t k v)
|
|
(jolt-trans-check t "assoc!")
|
|
(jolt-transient-coll-set! t (jolt-assoc (jolt-transient-coll t) k v))
|
|
t)
|
|
(define (jolt-dissoc! t . ks)
|
|
(jolt-trans-check t "dissoc!")
|
|
(jolt-transient-coll-set! t (apply jolt-dissoc (jolt-transient-coll t) ks))
|
|
t)
|
|
(define (jolt-disj! t . xs)
|
|
(jolt-trans-check t "disj!")
|
|
(jolt-transient-coll-set! t (apply jolt-disj (jolt-transient-coll t) xs))
|
|
t)
|
|
(define (jolt-pop! t)
|
|
(jolt-trans-check t "pop!")
|
|
(jolt-transient-coll-set! t (jolt-pop (jolt-transient-coll t)))
|
|
t)
|
|
|
|
;; persistent disj over sets (pset-disj already exists in collections.ss).
|
|
(define (jolt-disj s . xs)
|
|
(let loop ((s s) (xs xs)) (if (null? xs) s (loop (pset-disj s (car xs)) (cdr xs)))))
|
|
|
|
;; get / count / contains? see through a transient. Redefine the native procedures
|
|
;; (captured first) so the existing emit lowerings (jolt-get/jolt-count/
|
|
;; jolt-contains?) unwrap a transient before delegating; non-transients are
|
|
;; untouched.
|
|
(define (jolt-deref-transient x) (if (jolt-transient? x) (jolt-transient-coll x) x))
|
|
(define %prev-jolt-get jolt-get)
|
|
(set! jolt-get
|
|
(case-lambda
|
|
((coll k) (%prev-jolt-get (jolt-deref-transient coll) k))
|
|
((coll k d) (%prev-jolt-get (jolt-deref-transient coll) k d))))
|
|
(define %prev-jolt-count jolt-count)
|
|
(set! jolt-count (lambda (coll) (%prev-jolt-count (jolt-deref-transient coll))))
|
|
(define %prev-jolt-contains? jolt-contains?)
|
|
(set! jolt-contains? (lambda (coll k) (%prev-jolt-contains? (jolt-deref-transient coll) k)))
|
|
|
|
(def-var! "clojure.core" "transient" jolt-transient-new)
|
|
(def-var! "clojure.core" "persistent!" jolt-persistent!)
|
|
(def-var! "clojure.core" "conj!" jolt-conj!)
|
|
(def-var! "clojure.core" "assoc!" jolt-assoc!)
|
|
(def-var! "clojure.core" "dissoc!" jolt-dissoc!)
|
|
(def-var! "clojure.core" "disj!" jolt-disj!)
|
|
(def-var! "clojure.core" "pop!" jolt-pop!)
|
|
(def-var! "clojure.core" "disj" jolt-disj)
|