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(ns lux.analyser.env
(:require clojure.core.match
clojure.core.match.array
(lux [base :as & :refer [|do return return* |case]])
[lux.analyser.base :as &&]))
;; [Exports]
(def next-local-idx
(fn [state]
(return* state (->> state (&/get$ &/$scopes) &/|head (&/get$ &/$locals) (&/get$ &/$counter)))))
(defn with-local [name type body]
(fn [state]
(let [old-mappings (->> state (&/get$ &/$scopes) &/|head (&/get$ &/$locals) (&/get$ &/$mappings))
=return (body (&/update$ &/$scopes
(fn [stack]
(let [var-analysis (&&/|meta type &/empty-cursor (&&/$var (&/$Local (->> (&/|head stack) (&/get$ &/$locals) (&/get$ &/$counter)))))]
(&/$Cons (&/update$ &/$locals #(->> %
(&/update$ &/$counter inc)
(&/update$ &/$mappings (fn [m] (&/|put name var-analysis m))))
(&/|head stack))
(&/|tail stack))))
state))]
(|case =return
(&/$Right ?state ?value)
(return* (&/update$ &/$scopes (fn [stack*]
(&/$Cons (&/update$ &/$locals #(->> %
(&/update$ &/$counter dec)
(&/set$ &/$mappings old-mappings))
(&/|head stack*))
(&/|tail stack*)))
?state)
?value)
_
=return))))
(defn with-alias [name var-analysis body]
(fn [state]
(let [old-mappings (->> state (&/get$ &/$scopes) &/|head (&/get$ &/$locals) (&/get$ &/$mappings))
=return (body (&/update$ &/$scopes
(fn [stack]
(&/$Cons (&/update$ &/$locals #(->> %
(&/update$ &/$mappings (fn [m] (&/|put name var-analysis m))))
(&/|head stack))
(&/|tail stack)))
state))]
(|case =return
(&/$Right ?state ?value)
(return* (&/update$ &/$scopes (fn [stack*]
(&/$Cons (&/update$ &/$locals #(->> %
(&/set$ &/$mappings old-mappings))
(&/|head stack*))
(&/|tail stack*)))
?state)
?value)
_
=return))))
(def captured-vars
(fn [state]
(|case (&/get$ &/$scopes state)
(&/$Nil)
((&/fail-with-loc "[Analyser Error] Cannot obtain captured vars without environments.")
state)
(&/$Cons env _)
(return* state (->> env (&/get$ &/$captured) (&/get$ &/$mappings))))
))
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