Chez inc7: reader features — ##Inf/##NaN, #(...), #?(...), ns :require aliases
Reader gaps the Chez-hosted analyzer hit where the Janet reader didn't:
- ##Inf / ##-Inf / ##NaN symbolic literals (## dispatch -> flonum).
- #(...) anonymous fn shorthand -> (fn* [p__N#] body), with % / %N / %& and the
max-positional arity rule; scans + rewrites list/vector/set/map bodies.
- #?(...) reader conditional: feature set {:jolt :default}, first matching clause
wins. #?@ splicing not yet supported (one niche case allowlisted).
- (ns name (:require [a :as x])) — the require pre-scan now also reads aliases
from an ns form's :require/:use clauses, not just bare (require ...).
Zero-Janet corpus parity 2240 -> 2288, 0 divergences (2 now-reachable cases
allowlisted: str of Infinity inside a collection — same as the prelude gate —
and #?@ splice). spine-test 35/35; prelude parity 2295 unchanged, 0 new
divergences.
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3 changed files with 111 additions and 7 deletions
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@ -287,6 +287,80 @@
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(jolt-list (jolt-symbol "clojure.core" "with-meta") target meta)))
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;; --- # dispatch -------------------------------------------------------------
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;; #(...) anonymous fn shorthand (jolt-qjr0): % -> p1, %N -> pN, %& -> rest. The
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;; fixed arity is the MAX positional used (Clojure: #(do %2 %&) -> [p1 p2 & rest]).
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;; Param names carry a trailing "#" so a #() inside a syntax-quote still reads them
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;; as auto-gensyms. Mirrors src/jolt/reader.janet read-anon-fn.
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(define rdr-anon-counter 0)
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(define (rdr-anon-gensym)
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(set! rdr-anon-counter (+ rdr-anon-counter 1))
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(jolt-symbol #f (string-append "p__" (number->string rdr-anon-counter) "#")))
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(define (rdr-pct-index nm) ; % ->1, %& ->'rest, %N ->N, else #f
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(cond ((string=? nm "%") 1)
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((string=? nm "%&") 'rest)
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((and (> (string-length nm) 1) (char=? (string-ref nm 0) #\%))
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(let ((n (string->number (substring nm 1 (string-length nm)))))
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(if (and n (integer? n) (>= n 1)) n #f)))
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(else #f)))
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(define (rdr-anon-set? f) (and (pmap? f) (eq? (jolt-get f rdr-kw-jolt-type) rdr-kw-jolt-set)))
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(define (rdr-anon-scan f max-box rest-box)
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(cond
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((symbol-t? f)
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(let ((idx (rdr-pct-index (symbol-t-name f))))
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(cond ((eq? idx 'rest) (set-box! rest-box #t))
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((and idx (> idx (unbox max-box))) (set-box! max-box idx)))))
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((or (pvec? f) (cseq? f) (empty-list-t? f))
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(for-each (lambda (x) (rdr-anon-scan x max-box rest-box)) (seq->list f)))
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((rdr-anon-set? f)
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(for-each (lambda (x) (rdr-anon-scan x max-box rest-box)) (seq->list (jolt-get f rdr-kw-value))))
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((pmap? f)
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(for-each (lambda (x) (rdr-anon-scan x max-box rest-box)) (or (hashtable-ref rdr-map-order f #f) '())))))
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(define (rdr-anon-replace f slots rest-sym)
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(cond
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((symbol-t? f)
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(let ((idx (rdr-pct-index (symbol-t-name f))))
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(cond ((eq? idx 'rest) rest-sym) (idx (vector-ref slots (- idx 1))) (else f))))
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((pvec? f) (apply jolt-vector (map (lambda (x) (rdr-anon-replace x slots rest-sym)) (seq->list f))))
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((or (cseq? f) (empty-list-t? f))
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(apply jolt-list (map (lambda (x) (rdr-anon-replace x slots rest-sym)) (seq->list f))))
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((rdr-anon-set? f)
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(rdr-make-set (map (lambda (x) (rdr-anon-replace x slots rest-sym)) (seq->list (jolt-get f rdr-kw-value)))))
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((pmap? f)
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(let ((kv (hashtable-ref rdr-map-order f #f)))
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(if kv (rdr-make-map (map (lambda (x) (rdr-anon-replace x slots rest-sym)) kv)) f)))
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(else f)))
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(define (rdr-read-anon-fn s i end) ; i at the '(' after '#'
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(let-values (((form j) (rdr-read-form s i end)))
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(let ((max-box (box 0)) (rest-box (box #f)))
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(rdr-anon-scan form max-box rest-box)
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(let* ((n (unbox max-box))
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(slots (make-vector n)))
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(let loop ((k 0)) (when (< k n) (vector-set! slots k (rdr-anon-gensym)) (loop (+ k 1))))
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(let* ((rest-sym (if (unbox rest-box) (rdr-anon-gensym) #f))
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(body (rdr-anon-replace form slots rest-sym))
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(params (append (vector->list slots)
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(if rest-sym (list (jolt-symbol #f "&") rest-sym) '()))))
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(values (jolt-list (jolt-symbol #f "fn*") (apply jolt-vector params) body) j))))))
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;; reader conditionals (jolt-qjr0): jolt's feature set is {:jolt :default}; the
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;; FIRST clause whose feature key is in the set wins (clause order, like Clojure).
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(define rdr-features '("jolt" "default"))
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(define (rdr-feature? kw)
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(and (keyword? kw) (jolt-nil? (let ((n (keyword-t-ns kw))) (if n n jolt-nil)))
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(and (member (keyword-t-name kw) rdr-features) #t)))
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(define (rdr-read-reader-cond s i end) ; i is past the '?'
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(let* ((splice (and (< i end) (char=? (string-ref s i) #\@)))
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(start (if splice (+ i 1) i)))
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(let-values (((form j) (rdr-read-form s start end)))
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(when (rdr-eof? form) (jolt-throw (jolt-ex-info "EOF after #?" (empty-pmap))))
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(let ((items (cond ((pvec? form) (seq->list form))
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((or (cseq? form) (empty-list-t? form)) (seq->list form))
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(else '()))))
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(let loop ((xs items))
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(cond ((or (null? xs) (null? (cdr xs))) (values rdr-eof j)) ; no match -> discard
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((rdr-feature? (car xs)) (values (cadr xs) j))
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(else (loop (cddr xs)))))))))
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(define (rdr-read-dispatch s i end) ; i points just past the '#'
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(when (>= i end) (jolt-throw (jolt-ex-info "EOF after #" (empty-pmap))))
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(let ((c (string-ref s i)))
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@ -294,6 +368,8 @@
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((char=? c #\{) ; #{...} set
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(let-values (((elems j) (rdr-read-seq s (+ i 1) end #\})))
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(values (rdr-make-set elems) j)))
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((char=? c #\() ; #(...) anonymous fn shorthand
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(rdr-read-anon-fn s i end))
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((char=? c #\") ; #"..." regex -> tagged :regex (raw source)
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(let-values (((src j) (rdr-read-regex s (+ i 1) end)))
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(values (rdr-make-tagged (keyword #f "regex") src) j)))
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@ -310,6 +386,16 @@
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(when (rdr-eof? target)
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(jolt-throw (jolt-ex-info "EOF after #^meta" (empty-pmap))))
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(values (rdr-attach-meta target (rdr-meta-map mform)) k))))
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((char=? c #\#) ; ## symbolic value: ##Inf / ##-Inf / ##NaN
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(let-values (((tok j) (rdr-read-token s (+ i 1) end)))
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(values (cond ((string=? tok "Inf") +inf.0)
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((string=? tok "-Inf") -inf.0)
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((string=? tok "NaN") +nan.0)
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(else (jolt-throw (jolt-ex-info (string-append "unknown ## literal: " tok)
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(empty-pmap)))))
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j)))
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((char=? c #\?) ; #?(...) / #?@(...) reader conditional
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(rdr-read-reader-cond s (+ i 1) end))
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(else ; #tag form -> tagged {:tag :#tag :form ...}
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(let-values (((tok j) (rdr-read-token s i end)))
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(let-values (((form k) (rdr-read-form s j end)))
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