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;; Copyright (c) Eduardo Julian. All rights reserved.
;; The use and distribution terms for this software are covered by the
;; Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
;; which can be found in the file epl-v10.html at the root of this distribution.
;; By using this software in any fashion, you are agreeing to be bound by
;; the terms of this license.
;; You must not remove this notice, or any other, from this software.
(ns lux.analyser.env
(:require clojure.core.match
clojure.core.match.array
(lux [base :as & :refer [|do return return* fail |case]])
[lux.analyser.base :as &&]))
;; [Exports]
(def next-local-idx
(fn [state]
(return* state (->> state (&/get$ &/$ENVS) &/|head (&/get$ &/$LOCALS) (&/get$ &/$COUNTER)))))
(defn with-local [name type body]
;; (prn 'with-local name)
(fn [state]
;; (prn 'with-local name)
(let [old-mappings (->> state (&/get$ &/$ENVS) &/|head (&/get$ &/$LOCALS) (&/get$ &/$MAPPINGS))
=return (body (&/update$ &/$ENVS
(fn [stack]
(let [bound-unit (&/V &/$Local (->> (&/|head stack) (&/get$ &/$LOCALS) (&/get$ &/$COUNTER)))]
(&/|cons (&/update$ &/$LOCALS #(->> %
(&/update$ &/$COUNTER inc)
(&/update$ &/$MAPPINGS (fn [m] (&/|put name (&/T bound-unit type) m))))
(&/|head stack))
(&/|tail stack))))
state))]
(|case =return
(&/$Right ?state ?value)
(return* (&/update$ &/$ENVS (fn [stack*]
(&/|cons (&/update$ &/$LOCALS #(->> %
(&/update$ &/$COUNTER dec)
(&/set$ &/$MAPPINGS old-mappings))
(&/|head stack*))
(&/|tail stack*)))
?state)
?value)
_
=return))))
(def captured-vars
(fn [state]
(return* state (->> state (&/get$ &/$ENVS) &/|head (&/get$ &/$CLOSURE) (&/get$ &/$MAPPINGS)))))
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