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;; Copyright (c) Eduardo Julian. All rights reserved.
;; This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
;; If a copy of the MPL was not distributed with this file,
;; You can obtain one at http://mozilla.org/MPL/2.0/.
(ns lux.compiler.cache.type
(:require (clojure [template :refer [do-template]]
[string :as string])
[clojure.core.match :as M :refer [matchv]]
clojure.core.match.array
(lux [base :as & :refer [|let |do return* return fail fail* |case]]
[type :as &type])))
(def ^:private stop (->> 7 char str))
(def ^:private cons-signal (->> 5 char str))
(def ^:private nil-signal (->> 6 char str))
(def ^:private ident-separator ";")
(defn ^:private serialize-list [serialize-type params]
(str (&/fold (fn [so-far param]
(str so-far cons-signal (serialize-type param)))
""
params)
nil-signal))
(defn serialize-type
"(-> Type Text)"
[type]
(if (clojure.lang.Util/identical &type/Type type)
"T"
(|case type
(&/$HostT name params)
(str "^" name stop (serialize-list serialize-type params))
(&/$VoidT)
"0"
(&/$UnitT)
"1"
(&/$ProdT left right)
(str "*" (serialize-type left) (serialize-type right))
(&/$SumT left right)
(str "+" (serialize-type left) (serialize-type right))
(&/$LambdaT left right)
(str ">" (serialize-type left) (serialize-type right))
(&/$UnivQ env body)
(str "U" (serialize-list serialize-type env) (serialize-type body))
(&/$ExQ env body)
(str "E" (serialize-list serialize-type env) (serialize-type body))
(&/$BoundT idx)
(str "$" idx stop)
(&/$ExT idx)
(str "!" idx stop)
(&/$VarT idx)
(str "?" idx stop)
(&/$AppT left right)
(str "%" (serialize-type left) (serialize-type right))
(&/$NamedT [module name] type*)
(str "@" module ident-separator name stop (serialize-type type*))
_
(assert false (prn 'serialize-type (&type/show-type type)))
)))
(declare deserialize-type)
(defn ^:private deserialize-list [input]
(cond (.startsWith input nil-signal)
[&/$Nil (.substring input 1)]
(.startsWith input cons-signal)
(when-let [[head ^String input*] (deserialize-type (.substring input 1))]
(when-let [[tail ^String input*] (deserialize-list input*)]
[(&/$Cons head tail) input*]))
))
(do-template [<name> <signal> <type>]
(defn <name> [^String input]
(when (.startsWith input <signal>)
[<type> (.substring input 1)]
))
^:private deserialize-void "0" &/$VoidT
^:private deserialize-unit "1" &/$UnitT
^:private deserialize-type* "T" &type/Type
)
(do-template [<name> <signal> <type>]
(defn <name> [^String input]
(when (.startsWith input <signal>)
(when-let [[left ^String input*] (deserialize-type (.substring input 1))]
(when-let [[right ^String input*] (deserialize-type input*)]
[(<type> left right) input*]))
))
^:private deserialize-sum "+" &/$SumT
^:private deserialize-prod "*" &/$ProdT
^:private deserialize-lambda ">" &/$LambdaT
^:private deserialize-app "%" &/$AppT
)
(do-template [<name> <signal> <type>]
(defn <name> [^String input]
(when (.startsWith input <signal>)
(let [[idx ^String input*] (.split (.substring input 1) stop 2)]
[(<type> (Long/parseLong idx)) input*])))
^:private deserialize-bound "$" &/$BoundT
^:private deserialize-ex "!" &/$ExT
^:private deserialize-var "?" &/$VarT
)
(defn ^:private deserialize-named [^String input]
(when (.startsWith input "@")
(let [[^String module+name ^String input*] (.split (.substring input 1) stop 2)
[module name] (.split module+name ident-separator 2)]
(when-let [[type* ^String input*] (deserialize-type input*)]
[(&/$NamedT (&/T [module name]) type*) input*]))))
(do-template [<name> <signal> <type>]
(defn <name> [^String input]
(when (.startsWith input <signal>)
(when-let [[env ^String input*] (deserialize-list (.substring input 1))]
(when-let [[body ^String input*] (deserialize-type input*)]
[(<type> env body) input*]))))
^:private deserialize-univq "U" &/$UnivQ
^:private deserialize-exq "E" &/$ExQ
)
(defn ^:private deserialize-host [^String input]
(when (.startsWith input "^")
(let [[name ^String input*] (.split (.substring input 1) stop 2)]
(when-let [[params ^String input*] (deserialize-list input*)]
[(&/$HostT name params) input*]))))
(defn deserialize-type
"(-> Text Type)"
[input]
(or (deserialize-type* input)
(deserialize-void input)
(deserialize-unit input)
(deserialize-sum input)
(deserialize-prod input)
(deserialize-lambda input)
(deserialize-app input)
(deserialize-bound input)
(deserialize-ex input)
(deserialize-var input)
(deserialize-named input)
(deserialize-univq input)
(deserialize-exq input)
(deserialize-host input)
(assert false (str "[Cache error] Can't deserialize type. --- " input))))
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