e434356590
jolt-str-render-one and instance-check were each extended by a chain of set!-wrapping closures spread across ~10 and ~5 host files, so the real behavior of either was scattered and load-order-dependent. Give each a registry the base file owns: converters.ss/records-interop.ss define the registry plus a register-* helper, and each extending file registers one arm instead of capturing %prev and set!-ing the global. str-render arms are type-disjoint; instance-check arms run newest-first (the old outermost-wins order) and may return 'pass to defer. The string-token -> symbol normalization the natives-array arm did for every inner arm moves to the dispatcher head; array tokens stay strings for that arm to decide. jolt-ogib.14. Runtime-only shims, no re-mint.
172 lines
8 KiB
Scheme
172 lines
8 KiB
Scheme
;; converters + string ops — host-coupled natives def-var!'d into clojure.core,
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;; resolved in prelude mode. Loaded last (after jolt-pr-str), since `str` reuses
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;; the printer. int/long truncate toward zero to an exact integer; compare returns
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;; an exact -1/0/1; double yields a flonum.
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;; str rendering for the value types not handled by the fast arms below. A host
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;; shim loaded later (records, host-table, inst-time, …) registers an arm with
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;; register-str-render! instead of set!-wrapping jolt-str-render-one — the arms
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;; are type-disjoint, so the full behavior is the base arms here plus the
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;; registry, gathered in one place rather than scattered across a set! chain.
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;; Newest registration is checked first (matches the old outermost-wins order).
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(define str-render-registry '()) ; list of (pred . render), checked front-to-back
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(define (register-str-render! pred render)
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(set! str-render-registry (cons (cons pred render) str-render-registry)))
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;; str: nil -> "", string raw, char bare (not \c), regex -> raw source, a
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;; registered host type via its arm, else the printer (which renders collections
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;; with readable elements).
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(define (jolt-str-render-one v)
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(cond
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((jolt-nil? v) "")
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((string? v) v)
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((char? v) (string v))
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((regex-t? v) (regex-t-source v))
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;; str/print render the infinities and NaN long-form (Clojure .toString),
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;; unlike the -e printer's inf/-inf/nan.
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((and (flonum? v) (fl= v +inf.0)) "Infinity")
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((and (flonum? v) (fl= v -inf.0)) "-Infinity")
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((and (flonum? v) (not (fl= v v))) "NaN")
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(else
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(let loop ((rs str-render-registry))
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(cond
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((null? rs) (jolt-pr-str v))
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(((caar rs) v) ((cdar rs) v))
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(else (loop (cdr rs))))))))
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(define (jolt-str . xs)
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(let loop ((xs xs) (acc '()))
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(if (null? xs)
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(apply string-append (reverse acc))
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(loop (cdr xs) (cons (jolt-str-render-one (car xs)) acc)))))
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;; jolt indices are flonums; substring etc. need exact ints.
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(define (jolt->idx n) (exact (truncate n)))
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(define (jolt-subs s start . end)
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(substring s (jolt->idx start)
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(if (null? end) (string-length s) (jolt->idx (car end)))))
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;; vec: a pvec from any seqable (already-pvec returns itself).
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(define (jolt-vec coll)
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(cond
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((jolt-nil? coll) (jolt-vector))
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((pvec? coll) coll)
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((string? coll) (apply jolt-vector (string->list coll)))
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(else (apply jolt-vector (seq->list coll)))))
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(define (jolt-keyword . args)
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(cond
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((= (length args) 1)
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(let ((a (car args)))
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(cond
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((jolt-nil? a) jolt-nil)
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((keyword? a) a)
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;; a 1-arg string splits on the FIRST "/" into ns/name:
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;; (keyword "x/y") => :x/y with ns "x" — destructure's {:keys [x/y]} builds
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;; the key this way, so without the split the namespaced key never matches.
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((string? a)
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(let ((si (let loop ((i 0))
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(cond ((>= i (string-length a)) #f)
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((char=? (string-ref a i) #\/) i)
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(else (loop (+ i 1)))))))
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(if (and si (> si 0) (< si (- (string-length a) 1)))
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(keyword (substring a 0 si) (substring a (+ si 1) (string-length a)))
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(keyword #f a))))
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((jolt-symbol? a)
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(let ((ns (symbol-t-ns a)))
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(keyword (if (or (jolt-nil? ns) (not ns) (eq? ns '())) #f ns) (symbol-t-name a))))
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(else (error #f "keyword: requires string/symbol/keyword" a)))))
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((= (length args) 2)
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(keyword (let ((ns (car args))) (if (jolt-nil? ns) #f ns)) (cadr args)))
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(else (error #f "keyword: wrong arity"))))
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(define (jolt-symbol-new . args)
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(cond
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((= (length args) 1)
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(let ((a (car args)))
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(cond
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((jolt-symbol? a) a)
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;; (symbol "ns/name") splits the namespace at the LAST "/" (JVM
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;; Symbol.intern), so (namespace (symbol "foo/bar")) => "foo". A lone "/"
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;; or a leading slash has no namespace. The no-ns sentinel is #f — matches
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;; emit's quoted-symbol lowering (jolt-symbol #f "x"), so (= 'x (symbol
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;; "x")) holds (jolt= compares ns with strict equal?).
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((string? a)
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(let ((slen (string-length a)))
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(if (string=? a "/")
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(jolt-symbol #f "/")
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(let loop ((i (- slen 1)))
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(cond ((<= i 0) (jolt-symbol #f a))
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((char=? (string-ref a i) #\/)
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(jolt-symbol (substring a 0 i) (substring a (+ i 1) slen)))
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(else (loop (- i 1))))))))
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((keyword? a) (jolt-symbol (keyword-t-ns a) (keyword-t-name a)))
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(else (error #f "symbol: requires string/symbol" a)))))
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((= (length args) 2) (jolt-symbol (car args) (cadr args)))
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(else (error #f "symbol: wrong arity"))))
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;; gensym: per-process counter.
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(define jolt-gensym-counter 0)
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(define (jolt-gensym . prefix)
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(let ((p (if (null? prefix) "G__" (car prefix))))
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(set! jolt-gensym-counter (+ jolt-gensym-counter 1))
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(jolt-symbol #f
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(string-append (if (string? p) p (jolt-str-render-one p))
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(number->string jolt-gensym-counter)))))
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;; int/long: truncate toward zero to an EXACT integer (= JVM long). char -> code
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;; point (exact). double: always a flonum (= JVM double).
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(define (jolt-int x) (if (char? x) (char->integer x) (exact (truncate x))))
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(define (jolt-double x) (if (char? x) (exact->inexact (char->integer x)) (exact->inexact x)))
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;; compare: 3-way, returns an EXACT integer (= JVM compare -> int).
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(define (jolt-cmp3 x y) (cond ((< x y) -1) ((> x y) 1) (else 0)))
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(define (jolt-strcmp a b) (cond ((string<? a b) -1) ((string>? a b) 1) (else 0)))
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(define (jolt-kw->string k)
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(let ((ns (keyword-t-ns k))) (if ns (string-append ns "/" (keyword-t-name k)) (keyword-t-name k))))
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(define (jolt-sym-ns-string s)
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(let ((n (symbol-t-ns s))) (if (or (jolt-nil? n) (not n) (eq? n '())) "" n)))
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;; compare returns an EXACT integer -1/0/1 (= JVM compare -> int).
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(define (jolt-compare a b)
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(cond
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((and (jolt-nil? a) (jolt-nil? b)) 0)
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((jolt-nil? a) -1)
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((jolt-nil? b) 1)
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((and (number? a) (number? b)) (jolt-cmp3 a b))
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((and (string? a) (string? b)) (jolt-strcmp a b))
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((and (keyword? a) (keyword? b)) (jolt-strcmp (jolt-kw->string a) (jolt-kw->string b)))
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((and (jolt-symbol? a) (jolt-symbol? b))
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(let ((r (jolt-strcmp (jolt-sym-ns-string a) (jolt-sym-ns-string b))))
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(if (= r 0) (jolt-strcmp (symbol-t-name a) (symbol-t-name b)) r)))
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((and (boolean? a) (boolean? b)) (cond ((eq? a b) 0) ((eq? a #f) -1) (else 1)))
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((and (char? a) (char? b)) (jolt-cmp3 (char->integer a) (char->integer b)))
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((and (pvec? a) (pvec? b))
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(let ((la (pvec-count a)) (lb (pvec-count b)))
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(if (not (= la lb))
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(jolt-cmp3 la lb)
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(let loop ((i 0))
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(if (>= i la)
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0
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(let ((r (jolt-compare (pvec-nth-d a i jolt-nil) (pvec-nth-d b i jolt-nil))))
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(if (= r 0) (loop (+ i 1)) r)))))))
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(else (error #f "compare: cannot compare these types" a b))))
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(def-var! "clojure.core" "str" jolt-str)
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(def-var! "clojure.core" "subs" jolt-subs)
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(def-var! "clojure.core" "vec" jolt-vec)
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(def-var! "clojure.core" "keyword" jolt-keyword)
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(def-var! "clojure.core" "symbol" jolt-symbol-new)
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(def-var! "clojure.core" "gensym" jolt-gensym)
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(def-var! "clojure.core" "int" jolt-int)
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;; char: coerce a code point (jolt's all-flonum number) to a Chez char; pass a
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;; char through. Inverse of int on chars. The cross-compiled emitter's
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;; chez-str-lit needs it for printable-ASCII escaping.
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(define (jolt-char x) (if (char? x) x (integer->char (exact (round x)))))
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(def-var! "clojure.core" "char" jolt-char)
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;; long: same truncation as int in jolt's all-flonum model (seed core-long =
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;; math/trunc; char -> code point). Distinct cell so (long ...) resolves.
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(def-var! "clojure.core" "long" jolt-int)
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(def-var! "clojure.core" "double" jolt-double)
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;; float: Chez has no single-float type, so float coerces to a flonum like double.
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(def-var! "clojure.core" "float" jolt-double)
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(def-var! "clojure.core" "compare" jolt-compare)
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