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).
59 lines
2.3 KiB
Clojure
59 lines
2.3 KiB
Clojure
; Jolt Standard Library: clojure.walk
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; Tree walking for Clojure data structures.
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(defn walk
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[inner outer form]
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(cond
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; vectors/maps first so seq? can't swallow them (a vector is not seq? on
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; jolt, but keep the concrete branches authoritative). Re-attach the form's
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; metadata to the rebuilt collection, as Clojure does — a metadata-driven walk
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; (aero/spec) needs ^:ref and friends to survive the rebuild.
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(vector? form) (outer (with-meta (vec (map inner form)) (meta form)))
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; a record is also map?, but (empty record) yields a plain map — rebuild by
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; conj-ing the walked entries back onto the original so the record TYPE
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; survives. Type-dispatched walks depend on it (e.g. integrant resolves
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; #ig/ref by detecting its Ref record while postwalking the config).
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(record? form) (outer (reduce (fn [r x] (conj r (inner x))) form form))
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(map? form) (outer (with-meta (into (empty form) (map inner form)) (meta form)))
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; lists rebuild as lists, other seqs (incl. macro/template output: cons/
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; concat/lazy-seq) walk too — without this, postwalk-replace silently no-op'd
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; a quoted list, breaking clojure.template/apply-template
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(list? form) (outer (with-meta (apply list (map inner form)) (meta form)))
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(seq? form) (outer (with-meta (map inner form) (meta form)))
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:else (outer form)))
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(defn postwalk
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[f form]
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(walk (partial postwalk f) f form))
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(defn prewalk
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[f form]
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(walk (partial prewalk f) identity (f form)))
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(defn postwalk-demo
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"Demonstrates the behavior of postwalk by printing each form as it is walked."
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[form]
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(postwalk (fn [x] (print "Walked: ") (prn x) x) form))
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(defn prewalk-demo
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"Demonstrates the behavior of prewalk by printing each form as it is walked."
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[form]
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(prewalk (fn [x] (print "Walked: ") (prn x) x) form))
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(defn postwalk-replace
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[smap form]
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(postwalk (fn [x] (if (contains? smap x) (get smap x) x)) form))
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(defn prewalk-replace
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[smap form]
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(prewalk (fn [x] (if (contains? smap x) (get smap x) x)) form))
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(defn keywordize-keys
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[m]
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(let [f (fn [[k v]] (if (string? k) [(keyword k) v] [k v]))]
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(postwalk (fn [x] (if (map? x) (into {} (map f x)) x)) m)))
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(defn stringify-keys
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[m]
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(let [f (fn [[k v]] (if (keyword? k) [(name k) v] [k v]))]
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(postwalk (fn [x] (if (map? x) (into {} (map f x)) x)) m)))
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