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35 lines
813 B
Plaintext
35 lines
813 B
Plaintext
(def! bind-env (fn* [env b e]
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(if (empty? b)
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env
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(let* [b0 (first b)]
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(if (= '& b0)
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(assoc env (str (nth b 1)) e)
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(bind-env (assoc env (str b0) (first e)) (rest b) (rest e)))))))
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(def! new-env (fn* [& args]
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(if (<= (count args) 1)
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(atom {:outer (first args)})
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(atom (apply bind-env {:outer (first args)} (rest args))))))
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(def! env-find (fn* [env k]
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(env-find-str env (str k))))
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(def! env-find-str (fn* [env ks]
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(if env
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(let* [data @env]
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(if (contains? data ks)
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env
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(env-find-str (get data :outer) ks))))))
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(def! env-get (fn* [env k]
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(let* [ks (str k)
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e (env-find-str env ks)]
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(if e
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(get @e ks)
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(throw (str "'" ks "' not found"))))))
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(def! env-set (fn* [env k v]
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(do
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(swap! env assoc (str k) v)
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v)))
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