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(ns lux.analyser.lux
(:require (clojure [template :refer [do-template]])
[clojure.core.match :as M :refer [matchv]]
clojure.core.match.array
(lux [base :as & :refer [|do return return* fail fail* |let |list]]
[parser :as &parser]
[type :as &type]
[macro :as ¯o]
[host :as &host])
(lux.analyser [base :as &&]
[lambda :as &&lambda]
[case :as &&case]
[env :as &&env]
[def :as &&def])))
(defn ^:private analyse-1+ [analyse]
(fn [?token]
(&&/with-var #(&&/analyse-1 analyse % ?token))))
;; [Exports]
(defn analyse-tuple [analyse exo-type ?elems]
(|do [=elems (&/map% (analyse-1+ analyse) ?elems)
=elems-types (&/map% &&/expr-type =elems)
;; :let [_ (prn 'analyse-tuple =elems)]
:let [endo-type (&/V "lux;TupleT" =elems-types)]
_ (&type/check exo-type endo-type)
;; :let [_ (prn 'analyse-tuple 'DONE)]
]
(return (&/|list (&/V "Expression" (&/T (&/V "tuple" =elems)
exo-type))))))
(defn analyse-variant [analyse exo-type ident ?value]
(|let [[?module ?name] ident]
(|do [module (if (= "" ?module)
&/get-module-name
(return ?module))
:let [?tag (str module ";" ?name)]
=value ((analyse-1+ analyse) ?value)
=value-type (&&/expr-type =value)
:let [endo-type (&/V "lux;VariantT" (|list (&/T ?tag =value-type)))]
_ (&type/check exo-type endo-type)
;; :let [_ (prn 'analyse-variant 'DONE)]
]
(return (&/|list (&/V "Expression" (&/T (&/V "variant" (&/T ?tag =value))
exo-type)))))))
(defn analyse-record [analyse exo-type ?elems]
(|do [=elems (&/map% (fn [kv]
(matchv ::M/objects [kv]
[[k v]]
(|do [=v (&&/analyse-1 analyse v)]
(return (to-array [k =v])))))
?elems)
=elems-types (&/map% (fn [kv]
(matchv ::M/objects [kv]
[[k v]]
(|do [module (if (= "" k)
&/get-module-name
(return k))
=v (&&/expr-type v)]
(return (to-array [module =v])))))
=elems)
;; :let [_ (prn 'analyse-tuple =elems)]
]
(return (&/|list (&/V "Expression" (&/T (&/V "lux;record" =elems) (&/V "lux;RecordT" =elems-types)))))))
(defn ^:private show-frame [frame]
(str "{{" (->> frame (&/get$ "lux;locals") (&/get$ "lux;mappings")
&/|keys &/->seq (interpose " ") (reduce str ""))
"}}"))
(defn analyse-symbol [analyse exo-type ident]
(|do [module-name &/get-module-name]
(fn [state]
(|let [[?module ?name] ident
local-ident (str ?module ";" ?name)
global-ident (str (if (= "" ?module) module-name ?module) ";" ?name)
stack (&/get$ "lux;local-envs" state)
no-binding? #(and (->> % (&/get$ "lux;locals") (&/get$ "lux;mappings") (&/|contains? local-ident) not)
(->> % (&/get$ "lux;closure") (&/get$ "lux;mappings") (&/|contains? local-ident) not))
[inner outer] (&/|split-with no-binding? stack)]
(matchv ::M/objects [outer]
[["lux;Nil" _]]
(if-let [global (->> state (&/get$ "lux;global-env") &/from-some (&/get$ "lux;locals") (&/get$ "lux;mappings") (&/|get global-ident))]
(&/run-state (|do [=global-type (&&/expr-type global)
_ (&type/check exo-type =global-type)]
(return (&/|list global)))
state)
(do (prn (str "((" (->> stack (&/|map show-frame) &/->seq (interpose " ") (reduce str "")) "))"))
(fail* (str "[Analyser Error] Unrecognized identifier: " local-ident))))
[["lux;Cons" [top-outer _]]]
(|let [scopes (&/|tail (&/folds #(&/|cons (&/get$ "lux;name" %2) %1)
(&/|map #(&/get$ "lux;name" %) outer)
(&/|reverse inner)))
[=local inner*] (&/fold (fn [register+new-inner frame+in-scope]
(|let [[register new-inner] register+new-inner
[frame in-scope] frame+in-scope
[register* frame*] (&&lambda/close-over (&/|cons module-name (&/|reverse in-scope)) ?name register frame)]
(&/T register* (&/|cons frame* new-inner))))
(&/T (or (->> top-outer (&/get$ "lux;locals") (&/get$ "lux;mappings") (&/|get local-ident))
(->> top-outer (&/get$ "lux;closure") (&/get$ "lux;mappings") (&/|get local-ident)))
(&/|list))
(&/zip2 (&/|reverse inner) scopes))]
(return* (&/set$ "lux;local-envs" (&/|++ inner* outer) state) (&/|list =local)))
)))
))
(defn ^:private analyse-apply* [analyse exo-type =fn ?args]
(|do [=args (&/map% (fn [arg] (&&/with-var #(&&/analyse-1 analyse % arg)))
?args)
=fn-type (&&/expr-type =fn)
[=apply =output-type] (&/fold% (fn [[=fn =fn-type] =input]
(|do [;; :let [_ (prn "#2")]
=input-type (&&/expr-type =input)
;; :let [_ (prn "#3")]
=output-type (&type/apply-lambda =fn-type =input-type)
;; :let [_ (prn "#4")]
]
(return [(&/V "Expression" (&/T (&/V "apply" (&/T =fn =input))
=output-type))
=output-type])))
[=fn =fn-type]
=args)
_ (&type/check exo-type =output-type)]
(matchv ::M/objects [=apply]
[["Expression" [?expr _]]]
(return (&/|list (&/V "Expression" (&/T ?expr exo-type)))))))
(defn analyse-apply [analyse exo-type =fn ?args]
;; (prn 'analyse-apply1 (aget =fn 0))
(|do [loader &/loader]
(matchv ::M/objects [=fn]
[["Expression" [=fn-form =fn-type]]]
(do ;; (prn 'analyse-apply2 (aget =fn-form 0))
(matchv ::M/objects [=fn-form]
[["global" [?module ?name]]]
(|do [macro? (&&def/macro? ?module ?name)]
(if macro?
(let [macro-class (&host/location (&/|list ?module ?name))]
(|do [macro-expansion (¯o/expand loader macro-class ?args)
output (&/flat-map% analyse macro-expansion)]
(return output)))
(analyse-apply* analyse exo-type =fn ?args)))
[_]
(analyse-apply* analyse =fn ?args)))
[_]
(fail "[Analyser Error] Can't call a statement!"))
))
(defn analyse-case [analyse exo-type ?value ?branches]
(|do [:let [num-branches (&/|length ?branches)]
_ (&/assert! (> num-branches 0) "[Analyser Error] Can't have empty branches in \"case'\" expression.")
_ (&/assert! (even? num-branches) "[Analyser Error] Unbalanced branches in \"case'\" expression.")
=value ((analyse-1+ analyse) ?value)
=value-type (&&/expr-type =value)
=match (&&case/analyse-branches analyse exo-type =value-type (&/|as-pairs ?branches))]
(return (&/|list (&/V "Expression" (&/T (&/V "case" (&/T =value =match))
exo-type))))))
(defn analyse-lambda [analyse exo-type ?self ?arg ?body]
;; (prn 'analyse-lambda ?self ?arg ?body)
(|do [=lambda-type* &type/fresh-lambda]
(matchv ::M/objects [=lambda-type*]
[["lux;LambdaT" [=arg =return]]]
(|do [[=scope =captured =body] (&&lambda/with-lambda ?self =lambda-type*
?arg =arg
(&&/analyse-1 analyse =return ?body))
=lambda-type** (&type/clean =return =lambda-type*)
=bound-arg (&type/lookup =arg)
=lambda-type (matchv ::M/objects [=arg =bound-arg]
[["lux;VarT" id] ["lux;Some" bound]]
(&type/clean =arg =lambda-type**)
[["lux;VarT" id] ["lux;None" _]]
(let [var-name (str (gensym ""))
bound (&/V "lux;BoundT" var-name)]
(|do [_ (&type/reset id bound)
lambda-type (&type/clean =arg =lambda-type**)]
(return (&/V "lux;AllT" (&/T (&/|list) "" var-name lambda-type))))))]
(return (&/|list (&/V "Expression" (&/T (&/V "lambda" (&/T =scope =captured =body)) =lambda-type))))))))
(defn analyse-def [analyse exo-type ?name ?value]
;; (prn 'analyse-def ?name ?value)
(|do [_ (&type/check &type/Nothing exo-type)
module-name &/get-module-name]
(&/if% (&&def/defined? module-name ?name)
(fail (str "[Analyser Error] Can't redefine " ?name))
(|do [=value (&/with-scope ?name
(&&/with-var
#(&&/analyse-1 analyse % ?value)))
=value-type (&&/expr-type =value)
:let [_ (prn 'analyse-def ?name (&type/show-type =value-type))]
_ (&&def/define module-name ?name =value-type)]
(return (&/|list (&/V "Statement" (&/V "def" (&/T ?name =value)))))))))
(defn analyse-declare-macro [exo-type ident]
(|let [[?module ?name] ident]
(|do [module-name &/get-module-name]
(if (= ?module module-name)
(|do [_ (&&def/declare-macro ?module ?name)]
(return (&/|list)))
(fail "Can't declare macros from foreign modules.")))))
(defn analyse-import [analyse exo-type ?path]
(assert false)
(return (&/|list)))
(defn analyse-check [analyse eval! exo-type ?type ?value]
(println "analyse-check#0")
(|do [=type (&&/analyse-1 analyse &type/Type ?type)
:let [_ (println "analyse-check#1")]
==type (eval! =type)
_ (&type/check exo-type ==type)
:let [_ (println "analyse-check#4" (&type/show-type ==type))]
=value (&&/analyse-1 analyse ==type ?value)
:let [_ (println "analyse-check#5")]]
(matchv ::M/objects [=value]
[["Expression" [?expr ?expr-type]]]
(|do [:let [_ (println "analyse-check#6" (&type/show-type ?expr-type))]
_ (&type/check ==type ?expr-type)
:let [_ (println "analyse-check#7")]]
(return (&/|list (&/V "Expression" (&/T ?expr ==type))))))))
(defn analyse-coerce [analyse eval! exo-type ?type ?value]
(|do [=type (&&/analyse-1 analyse &type/Type ?type)
==type (eval! =type)
=value (&&/analyse-1 analyse ==type ?value)]
(matchv ::M/objects [=value]
[["Expression" [?expr ?expr-type]]]
(return (&/|list (&/V "Expression" (&/T ?expr ==type)))))))
|
