4aec21e603
Fourth pure-fn batch (jolt-1j0 phase 2), 6 leaf fns. distinct? now uses value-semantics (the prior Janet impl keyed a table by identity, so equal collections compared distinct); nthnext uses the canonical loop form, which fixes (nthnext nil nil) => nil and the nil-count cases the prior pre-check threw on. replace preserves nil values via get-with-default. conformance 218/218 x3, clojure-test-suite 3927 -> 3928 (canonical nthnext), core-bench A/B flat. Per-batch gate caught a transient -1 from the first nthnext rewrite; fixed before commit.
123 lines
4 KiB
Clojure
123 lines
4 KiB
Clojure
;; clojure.core — collection tier. Pure, eager fns expressed as compositions of
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;; already-frozen core primitives (reduce/assoc/get/conj/filter/vec/count/>=).
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;; No host internals, no laziness, no macros — so they compile cleanly and stay
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;; redefinable. Loaded after the seq tier; self-hosted in compile mode.
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;;
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;; Same migration rule as the seq tier (see 10-seq.clj): not in core-renames, no
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;; internal Janet callers, not used by the self-hosted compiler.
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;; Base is (hash-map), not the {} literal: a literal map is a struct that doesn't
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;; canonicalize collection keys across representations (a {:a 1} literal vs
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;; (hash-map :a 1) key), whereas a PHM does — so counting/grouping by collection
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;; value needs the PHM base (the prior Janet impl used make-phm for this reason).
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(defn frequencies [coll]
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(reduce (fn [counts x] (assoc counts x (inc (get counts x 0)))) (hash-map) coll))
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(defn group-by [f coll]
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(reduce (fn [ret x] (let [k (f x)] (assoc ret k (conj (get ret k []) x)))) (hash-map) coll))
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(defn not-empty [coll]
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(if (or (nil? coll) (zero? (count coll))) nil coll))
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(defn filterv [pred coll]
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(vec (filter pred coll)))
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;; Greatest/least x by (k x). Canonical Clojure multi-arity: the first pair uses
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;; strict < / > and the fold uses <= / >= — this exact ordering reproduces the
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;; JVM IEEE-754 NaN behavior (e.g. (min-key identity 1 ##NaN) => ##NaN). > / <
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;; throw on non-numbers, as Clojure does.
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(defn max-key
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([k x] x)
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([k x y] (if (> (k x) (k y)) x y))
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([k x y & more]
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(let [kx (k x) ky (k y)
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v (if (> kx ky) x y)
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kv (if (> kx ky) kx ky)]
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(loop [v v kv kv more more]
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(if (seq more)
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(let [w (first more) kw (k w)]
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(if (>= kw kv) (recur w kw (next more)) (recur v kv (next more))))
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v)))))
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(defn min-key
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([k x] x)
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([k x y] (if (< (k x) (k y)) x y))
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([k x y & more]
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(let [kx (k x) ky (k y)
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v (if (< kx ky) x y)
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kv (if (< kx ky) kx ky)]
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(loop [v v kv kv more more]
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(if (seq more)
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(let [w (first more) kw (k w)]
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(if (<= kw kv) (recur w kw (next more)) (recur v kv (next more))))
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v)))))
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;; Function combinators (pure HOFs).
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(defn juxt [& fs]
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(fn [& args] (mapv (fn [f] (apply f args)) fs)))
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(defn every-pred [& preds]
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(fn [& xs] (every? (fn [p] (every? p xs)) preds)))
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(defn some-fn [& preds]
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(fn [& xs] (some (fn [p] (some p xs)) preds)))
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(defn not-any? [pred coll] (not (some pred coll)))
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(defn not-every? [pred coll] (not (every? pred coll)))
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(defn split-at [n coll] [(take n coll) (drop n coll)])
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(defn split-with [pred coll] [(take-while pred coll) (drop-while pred coll)])
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(defn ident? [x] (or (keyword? x) (symbol? x)))
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(defn qualified-ident? [x] (or (qualified-symbol? x) (qualified-keyword? x)))
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(defn simple-ident? [x] (or (simple-symbol? x) (simple-keyword? x)))
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;; Jolt has no ratio or bigdecimal types, so these are constants / reduce to int?.
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(defn ratio? [x] false)
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(defn decimal? [x] false)
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(defn rational? [x] (int? x))
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(defn nat-int? [x] (and (int? x) (>= x 0)))
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(defn neg-int? [x] (and (int? x) (neg? x)))
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(defn pos-int? [x] (and (int? x) (pos? x)))
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(defn replicate [n x] (map (fn [_] x) (range n)))
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(defn take-last [n coll]
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(let [c (vec coll) len (count c)]
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(when (pos? len) (subvec c (max 0 (- len n))))))
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(defn drop-last
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([coll] (drop-last 1 coll))
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([n coll] (let [c (vec coll)] (subvec c 0 (max 0 (- (count c) n))))))
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(defn distinct?
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([x] true)
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([x y] (not (= x y)))
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([x y & more]
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(if (not (= x y))
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(loop [s #{x y} xs more]
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(if xs
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(let [x (first xs)]
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(if (contains? s x) false (recur (conj s x) (next xs))))
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true))
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false)))
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(defn replace [smap coll] (mapv (fn [x] (get smap x x)) coll))
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(defn nthnext [coll n]
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(loop [n n xs (seq coll)]
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(if (and xs (pos? n))
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(recur (dec n) (next xs))
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xs)))
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(defn bounded-count [n coll] (min n (count coll)))
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(defn run! [proc coll] (reduce (fn [_ x] (proc x) nil) nil coll) nil)
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(defn completing
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([f] (completing f identity))
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([f cf] (fn ([] (f)) ([x] (cf x)) ([x y] (f x y)))))
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