473d1002b7
The reader lowered ^meta on a vector/map/set literal to a runtime (with-meta form meta) list, so read-string/edn of data with metadata returned the form and lost the metadata. Attach it to the value instead, as Clojure does; the analyzer re-emits (with-meta coll meta) for a meta-carrying collection literal in code, so a literal still carries its metadata at runtime and ^Type/^long arglist hints (consumed by analyze-arity directly) are unaffected. Also: pr honors *print-meta*, and clojure.walk/clojure.edn re-attach metadata to the collections they rebuild (matches Clojure; a metadata-driven config lib like aero relies on it).
71 lines
3.4 KiB
Clojure
71 lines
3.4 KiB
Clojure
;; clojure.edn — reading EDN data. Delegates to the Jolt reader via
|
|
;; clojure.core/read-string (which parses, never evaluates — safe for EDN), and
|
|
;; adds the opts-map arity with :eof plus nil/blank-input handling.
|
|
(ns clojure.edn
|
|
"Reading EDN data."
|
|
(:require [clojure.string :as cstr]))
|
|
|
|
;; The reader yields set literals as a FORM ({:jolt/type :jolt/set :value [...]})
|
|
;; rather than a constructed set, so build the actual values, recursing into
|
|
;; maps/vectors/lists. (Lists stay lists — EDN never evaluates them as code.)
|
|
;; Re-attach the source value's metadata to each rebuilt collection — read-string
|
|
;; preserves reader metadata (^:ref […]) but this rebuild would otherwise drop it,
|
|
;; which a metadata-driven config lib (aero/integrant) relies on.
|
|
(defn- edn->value [opts x]
|
|
(cond
|
|
;; Reader FORMS are detected by :jolt/type tag, never by map? — strict map?
|
|
;; (correctly) excludes tagged structs, so the old (and (map? x) ...) guard
|
|
;; would skip them.
|
|
(= :jolt/set (get x :jolt/type)) (with-meta (set (map (fn [v] (edn->value opts v)) (get x :value))) (meta x))
|
|
;; Tagged elements: a reader from the :readers opt wins, then the built-in
|
|
;; data readers (#uuid/#inst + registered); an unknown tag falls to the
|
|
;; :default opt fn (called with tag and value, as in Clojure) or throws.
|
|
(= :jolt/tagged (get x :jolt/type))
|
|
(let [tag (get x :tag)
|
|
v (edn->value opts (get x :form))
|
|
;; the reader stores the tag as a :#name keyword; :readers maps are
|
|
;; keyed by the SYMBOL (Clojure's shape) — normalize for lookup
|
|
tag-sym (let [n (name tag)]
|
|
(symbol (if (= "#" (subs n 0 1)) (subs n 1) n)))
|
|
custom (get (get opts :readers) tag-sym)]
|
|
(cond
|
|
custom (custom v)
|
|
;; Clojure calls :default with the tag as a SYMBOL and the value.
|
|
(get opts :default) ((get opts :default) tag-sym v)
|
|
:else (__read-tagged tag v)))
|
|
(map? x)
|
|
(with-meta (into {} (map (fn [e] [(edn->value opts (key e)) (edn->value opts (val e))]) x)) (meta x))
|
|
(vector? x) (with-meta (mapv (fn [v] (edn->value opts v)) x) (meta x))
|
|
(seq? x) (with-meta (map (fn [v] (edn->value opts v)) x) (meta x))
|
|
:else x))
|
|
|
|
;; Private helper, NOT named read-string: an unqualified (read-string …) call
|
|
;; dispatches the core read-string SPECIAL FORM (by name, regardless of ns), so
|
|
;; the 1-arity can't delegate to the 2-arity through that name.
|
|
(defn- read-edn [opts s]
|
|
(if (or (nil? s) (cstr/blank? s))
|
|
(get opts :eof nil)
|
|
(edn->value opts (clojure.core/read-string s))))
|
|
|
|
(defn read-string
|
|
"Reads one object from the string s. Returns the :eof option value (default
|
|
nil) for nil or blank input. opts is an options map; :eof sets the value
|
|
returned at end of input."
|
|
([s] (read-edn {} s))
|
|
([opts s] (read-edn opts s)))
|
|
|
|
(defn- drain-reader
|
|
"All remaining content of a reader as a string. Shim readers (StringReader,
|
|
PushbackReader, io/reader results) expose char-wise .read; a raw file
|
|
handle is read whole."
|
|
[reader]
|
|
(loop [acc (transient []) c (.read reader)]
|
|
(if (== -1 c)
|
|
(apply str (map char (persistent! acc)))
|
|
(recur (conj! acc c) (.read reader)))))
|
|
|
|
(defn read
|
|
"Reads one EDN object from reader (a PushbackReader or any jolt reader).
|
|
Returns the :eof option value (default nil) at end of input."
|
|
([reader] (read {} reader))
|
|
([opts reader] (read-edn opts (drain-reader reader))))
|