afc733a439
clojure.edn/read with :readers/:default recursed into vectors/maps/seqs but
not a constructed set, so a tagged literal in #{…} (aero's #ref in a set) kept
its raw form. edn->value now recurses into a set. clojure.edn is baked into the
seed, re-minted. Fixes aero #ref-in-set + falsey-user-return.
74 lines
3.6 KiB
Clojure
74 lines
3.6 KiB
Clojure
;; clojure.edn — reading EDN data. Delegates to the Jolt reader via
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;; clojure.core/read-string (which parses, never evaluates — safe for EDN), and
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;; adds the opts-map arity with :eof plus nil/blank-input handling.
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(ns clojure.edn
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"Reading EDN data."
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(:require [clojure.string :as cstr]))
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;; The reader yields set literals as a FORM ({:jolt/type :jolt/set :value [...]})
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;; rather than a constructed set, so build the actual values, recursing into
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;; maps/vectors/lists. (Lists stay lists — EDN never evaluates them as code.)
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;; Re-attach the source value's metadata to each rebuilt collection — read-string
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;; preserves reader metadata (^:ref […]) but this rebuild would otherwise drop it,
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;; which a metadata-driven config lib (aero/integrant) relies on.
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(defn- edn->value [opts x]
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(cond
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;; Reader FORMS are detected by :jolt/type tag, never by map? — strict map?
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;; (correctly) excludes tagged structs, so the old (and (map? x) ...) guard
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;; would skip them.
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(= :jolt/set (get x :jolt/type)) (with-meta (set (map (fn [v] (edn->value opts v)) (get x :value))) (meta x))
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;; Tagged elements: a reader from the :readers opt wins, then the built-in
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;; data readers (#uuid/#inst + registered); an unknown tag falls to the
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;; :default opt fn (called with tag and value, as in Clojure) or throws.
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(= :jolt/tagged (get x :jolt/type))
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(let [tag (get x :tag)
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v (edn->value opts (get x :form))
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;; the reader stores the tag as a :#name keyword; :readers maps are
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;; keyed by the SYMBOL (Clojure's shape) — normalize for lookup
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tag-sym (let [n (name tag)]
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(symbol (if (= "#" (subs n 0 1)) (subs n 1) n)))
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custom (get (get opts :readers) tag-sym)]
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(cond
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custom (custom v)
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;; Clojure calls :default with the tag as a SYMBOL and the value.
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(get opts :default) ((get opts :default) tag-sym v)
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:else (__read-tagged tag v)))
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(map? x)
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(with-meta (into {} (map (fn [e] [(edn->value opts (key e)) (edn->value opts (val e))]) x)) (meta x))
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(vector? x) (with-meta (mapv (fn [v] (edn->value opts v)) x) (meta x))
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;; a constructed set: recurse into its elements too, so a tagged literal
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;; inside #{…} gets the :readers/:default treatment (aero's #ref in a set).
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(set? x) (with-meta (set (map (fn [v] (edn->value opts v)) x)) (meta x))
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(seq? x) (with-meta (map (fn [v] (edn->value opts v)) x) (meta x))
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:else x))
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;; Private helper, NOT named read-string: an unqualified (read-string …) call
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;; dispatches the core read-string SPECIAL FORM (by name, regardless of ns), so
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;; the 1-arity can't delegate to the 2-arity through that name.
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(defn- read-edn [opts s]
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(if (or (nil? s) (cstr/blank? s))
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(get opts :eof nil)
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(edn->value opts (clojure.core/read-string s))))
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(defn read-string
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"Reads one object from the string s. Returns the :eof option value (default
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nil) for nil or blank input. opts is an options map; :eof sets the value
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returned at end of input."
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([s] (read-edn {} s))
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([opts s] (read-edn opts s)))
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(defn- drain-reader
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"All remaining content of a reader as a string. Shim readers (StringReader,
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PushbackReader, io/reader results) expose char-wise .read; a raw file
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handle is read whole."
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[reader]
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(loop [acc (transient []) c (.read reader)]
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(if (== -1 c)
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(apply str (map char (persistent! acc)))
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(recur (conj! acc c) (.read reader)))))
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(defn read
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"Reads one EDN object from reader (a PushbackReader or any jolt reader).
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Returns the :eof option value (default nil) at end of input."
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([reader] (read {} reader))
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([opts reader] (read-edn opts (drain-reader reader))))
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