; clojure/core.clj:2536 (defn destructure [bindings] (let [bmap (apply array-map bindings) pb (fn pb [bvec b v] (let [pvec (fn [bvec b val] (let [gvec (gensym "vec__")] (loop [ret (-> bvec (conj gvec) (conj val)) n 0 bs b seen-rest? false] (if (seq bs) (let [firstb (first bs)] (cond (= firstb '&) (recur (pb ret (second bs) (list `nthnext gvec n)) n (nnext bs) true) (= firstb :as) (pb ret (second bs) gvec) :else (if seen-rest? (throw (new Exception "Unsupported binding form, only :as can follow & parameter")) (recur (pb ret firstb (list `nth gvec n nil)) (inc n) (next bs) seen-rest?)))) ret)))) pmap (fn [bvec b v] (let [gmap (or (:as b) (gensym "map__")) defaults (:or b)] (loop [ret (-> bvec (conj gmap) (conj v)) bes (reduce (fn [bes entry] (reduce #(assoc %1 %2 ((val entry) %2)) (dissoc bes (key entry)) ((key entry) bes))) (dissoc b :as :or) {:keys #(keyword (str %)), :strs str, :syms #(list `quote %)})] (if (seq bes) (let [bb (key (first bes)) bk (val (first bes)) has-default (contains? defaults bb)] (recur (pb ret bb (if has-default (list `get gmap bk (defaults bb)) (list `get gmap bk))) (next bes))) ret))))] (cond (symbol? b) (-> bvec (conj b) (conj v)) (vector? b) (pvec bvec b v) (map? b) (pmap bvec b v) :else (throw (new Exception (str "Unsupported binding form: " b)))))) process-entry (fn [bvec b] (pb bvec (key b) (val b)))] (if (every? symbol? (keys bmap)) bindings (reduce process-entry [] bmap))))
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