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Honor *print-length* / *print-level* / *default-data-reader-fn*

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Both printers (jolt-pr-str, jolt-pr-readable) now thread a print depth and
read the two limit vars. *print-length* truncates each collection to N
elements + "...", walking seqs lazily so an infinite seq prints under the
limit without realizing it. *print-level* renders a collection at depth >=
the level as "#". The reader consults *default-data-reader-fn* for an
unregistered #tag before falling back (tagged form on the data seam, throw
on the edn seam). All three interned with nil defaults.
This commit is contained in:
Yogthos 2026-06-26 19:04:42 -04:00
parent a9ecae9a29
commit 331a41ee26
6 changed files with 144 additions and 50 deletions
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14
host/chez/dynamic-var-defaults.ss
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@ -29,11 +29,19 @@
;; *print-meta* — when true, pr prints metadata with a ^ prefix; default false.
(def-var! "clojure.core" "*print-meta*" #f)
;; *print-length* / *print-level* — collection print limits, honored by both
;; printers (rt.ss jolt-pr-str + printing.ss jolt-pr-readable). nil = unlimited
;; (the default); a number truncates elements / collapses depth to "#".
;; *print-length* limits a lazy/infinite seq before realizing it.
(def-var! "clojure.core" "*print-length*" jolt-nil)
(def-var! "clojure.core" "*print-level*" jolt-nil)
;; *default-data-reader-fn* — a (fn [tag value]) the reader consults for an
;; unregistered #tag before raising; nil = no default handler.
(def-var! "clojure.core" "*default-data-reader-fn*" jolt-nil)
;; Portable clojure.core dynamic vars whose DEFAULT already matches jolt's
;; behaviour, so exposing them is sound (resolve/binding work, reads return the
;; right value) — not a silent divergence. The ones that change observable output
;; if set non-default (*print-length* / *print-level* / *default-data-reader-fn*)
;; are deliberately NOT interned until the printer/reader honour them.
;; right value) — not a silent divergence.
;;
;; *read-eval* — gates #=() read-eval. jolt's reader has no #=, so it reads true
;; (no eval-on-read happens regardless); a lib can (binding [*read-eval* false] …).