d168d1195b
Replace the set!-capture-and-rebind chains extending jolt-hash (3 sites: inst-time/ host-table/records) and jolt-class (3 sites: bigdec/natives-queue/host-table) with a register-hash-arm! / register-class-arm! registry (the pattern already used by register-str-render!). The base dispatcher walks its arms — disjoint types, so order is immaterial — then falls to the base cases. The entry is stable, so the per-site (def-var! "clojure.core" "class" …) re-points are gone. Behaviour-preserving (runtime .ss, no re-mint): jinst hash, bigdec/queue/record class, record hash, and a sorted-map hashing as its plain map all verified; make test green, 0 new corpus divergences. First two of six dispatchers; get/=/pr-str follow.
101 lines
4.9 KiB
Scheme
101 lines
4.9 KiB
Scheme
;; Jolt value model on Chez Scheme.
|
|
;;
|
|
;; The irreducible value layer the self-hosted RT rests on. Maps Clojure's value
|
|
;; types onto Chez natives where possible, and adds records only where Chez lacks
|
|
;; a distinct type (nil sentinel, keywords, ns-bearing symbols). Loaded into an
|
|
;; env that has already (import (chezscheme)).
|
|
;;
|
|
;; Design notes:
|
|
;; - nil is a UNIQUE sentinel, distinct from #f and '() (the classic Lisp-on-Lisp
|
|
;; trap). jolt false -> Chez #f, jolt true -> #t.
|
|
;; - Chez's numeric tower IS Clojure's: long->exact integer, double->flonum,
|
|
;; ratio->exact rational, bigint->bignum. Clojure `=` is exactness-aware:
|
|
;; (= 1 1.0) is FALSE.
|
|
|
|
;; --- nil ---------------------------------------------------------------------
|
|
(define-record-type jolt-nil-t (fields) (nongenerative jolt-nil-v1))
|
|
(define jolt-nil (make-jolt-nil-t))
|
|
(define (jolt-nil? x) (jolt-nil-t? x))
|
|
|
|
;; --- truthiness: only nil and false are falsey -------------------------------
|
|
(define (jolt-truthy? x) (not (or (jolt-nil? x) (eq? x #f))))
|
|
|
|
;; --- keywords: interned so identity works; optional namespace ----------------
|
|
(define-record-type keyword-t (fields ns name khash) (nongenerative keyword-v1))
|
|
(define keyword-table (make-hashtable string-hash string=?))
|
|
;; NUL separator can't occur in a keyword ns/name, so the intern key is
|
|
;; unambiguous (a "/" separator would collide ns="a" name="b/c" with ns="a/b").
|
|
(define (keyword-intern-key ns name) (string-append (or ns "") "\x0;" name))
|
|
(define (keyword ns name)
|
|
(let ((k (keyword-intern-key ns name)))
|
|
(or (hashtable-ref keyword-table k #f)
|
|
(let ((kw (make-keyword-t ns name (equal-hash k))))
|
|
(hashtable-set! keyword-table k kw)
|
|
kw))))
|
|
(define (keyword? x) (keyword-t? x))
|
|
|
|
;; --- symbols: ns + name + meta; NOT interned (meta varies), = by ns/name ------
|
|
(define-record-type symbol-t (fields ns name meta) (nongenerative symbol-v1))
|
|
(define (jolt-symbol ns name) (make-symbol-t ns name jolt-nil))
|
|
(define (jolt-symbol/meta ns name meta) (make-symbol-t ns name meta))
|
|
(define (jolt-symbol? x) (symbol-t? x))
|
|
|
|
;; chars/strings: Chez natives (strings treated immutable).
|
|
|
|
;; --- jolt equality (Clojure =) — scalars + collections ----------------------
|
|
(define (jolt=2 a b)
|
|
(cond
|
|
((and (jolt-nil? a) (jolt-nil? b)) #t)
|
|
((or (jolt-nil? a) (jolt-nil? b)) #f)
|
|
((and (number? a) (number? b)) ; exactness-aware
|
|
(and (eq? (exact? a) (exact? b)) (= a b)))
|
|
((and (keyword-t? a) (keyword-t? b)) (eq? a b)) ; interned
|
|
((and (symbol-t? a) (symbol-t? b))
|
|
(and (equal? (symbol-t-ns a) (symbol-t-ns b))
|
|
(string=? (symbol-t-name a) (symbol-t-name b))))
|
|
((and (char? a) (char? b)) (char=? a b))
|
|
((and (string? a) (string? b)) (string=? a b))
|
|
((and (boolean? a) (boolean? b)) (eq? a b))
|
|
;; sequential (vector / list / lazy seq) compare element-wise, cross-type:
|
|
;; (= [1 2 3] (list 1 2 3)) is true. Forward to seq.ss (loaded by rt.ss).
|
|
((and (jolt-sequential? a) (jolt-sequential? b)) (seq=? a b))
|
|
((or (jolt-sequential? a) (jolt-sequential? b)) #f)
|
|
;; other collections (map/set): forward to collections.ss.
|
|
((and (jolt-coll? a) (jolt-coll? b)) (jolt-coll=? a b))
|
|
(else (eq? a b))))
|
|
(define (jolt= a . rest)
|
|
(let loop ((a a) (rest rest))
|
|
(cond ((null? rest) #t)
|
|
((jolt=2 a (car rest)) (loop (car rest) (cdr rest)))
|
|
(else #f))))
|
|
|
|
;; --- jolt hash — consistent with jolt= (for the HAMT) -----------------------
|
|
;; A host shim (records, host-table, inst-time, …) registers its type's hash via
|
|
;; register-hash-arm! instead of set!-wrapping jolt-hash — the arms are disjoint
|
|
;; types, checked before the base cases, so the full behavior is gathered here plus
|
|
;; the registry rather than scattered across a set! chain (cf. register-str-render!).
|
|
(define jolt-hash-arms '())
|
|
(define (register-hash-arm! pred handler)
|
|
(set! jolt-hash-arms (cons (cons pred handler) jolt-hash-arms)))
|
|
(define (jolt-hash-base x)
|
|
(cond
|
|
((jolt-nil? x) 0)
|
|
((keyword-t? x) (keyword-t-khash x))
|
|
((symbol-t? x) (equal-hash (cons (symbol-t-ns x) (symbol-t-name x))))
|
|
;; distinguish inexact from exact (1 and 1.0 are not jolt=); guard non-finite
|
|
;; (inexact->exact would error on NaN/inf)
|
|
((number? x) (if (exact? x) (equal-hash x)
|
|
(if (and (flonum? x) (or (nan? x) (infinite? x)))
|
|
(equal-hash (cons 'inexact (number->string x)))
|
|
(equal-hash (cons 'inexact (inexact->exact x))))))
|
|
((string? x) (string-hash x))
|
|
((char? x) (char->integer x))
|
|
((boolean? x) (if x 1 2))
|
|
((jolt-sequential? x) (seq-hash x)) ; vector/list/seq hash alike (forward to seq.ss)
|
|
((jolt-coll? x) (jolt-coll-hash x)) ; map/set; forward to collections.ss
|
|
(else (equal-hash x))))
|
|
(define (jolt-hash x)
|
|
(let loop ((as jolt-hash-arms))
|
|
(cond ((null? as) (jolt-hash-base x))
|
|
(((caar as) x) ((cdar as) x))
|
|
(else (loop (cdr as))))))
|