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(ns lux.analyser.lux
(:require (clojure [template :refer [do-template]])
[clojure.core.match :refer [match]]
(lux [util :as &util :refer [exec return fail
try-all-m map-m mapcat-m reduce-m
assert!]]
[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])))
;; [Resources]
(defn analyse-tuple [analyse ?elems]
(exec [=elems (mapcat-m analyse ?elems)
=elems-types (map-m &/expr-type =elems)
;; :let [_ (prn 'analyse-tuple =elems)]
]
(return (list [::&/Expression [::tuple =elems] [::&type/Tuple =elems-types]]))))
(defn analyse-ident [analyse ident]
(fn [state]
(let [[top & stack*] (::local-envs state)]
(if-let [=bound (or (get-in top [:locals :mappings ident])
(get-in top [:closure :mappings ident]))]
[::&util/ok [state (list =bound)]]
(let [no-binding? #(and (-> % :locals :mappings (contains? ident) not)
(-> % :closure :mappings (contains? ident) not))
[inner outer] (split-with no-binding? stack*)]
(if (empty? outer)
(if-let [global (get-in state [::&util/global-env ident])]
[::&util/ok [state (list global)]]
[::&util/failure (str "[Analyser Error] Unresolved identifier: " ident)])
(let [[=local inner*] (reduce (fn [[register new-inner] frame]
(let [[register* frame*] (&&lambda/close-over (:name frame) ident register frame)]
[register* (cons frame* new-inner)]))
[(or (get-in (first outer) [:locals :mappings ident])
(get-in (first outer) [:closure :mappings ident]))
'()]
(reverse (cons top inner)))]
[::&util/ok [(assoc state ::&util/local-envs (concat inner* outer)) (list =local)]])
))
))
))
(defn analyse-call [analyse ?fn ?args]
(exec [=fn (&/analyse-1 analyse ?fn)
loader &util/loader]
(match =fn
[::&/Expression =fn-form =fn-type]
(match =fn-form
[::global ?module ?name]
(exec [macro? (&&env/macro? ?module ?name)]
(if macro?
(let [macro-class (&host/location (list ?name ?module))
[macro-expansion state*] (¯o/expand loader macro-class ?args)]
(mapcat-m analyse macro-expansion))
(exec [=args (mapcat-m analyse ?args)
:let [[needs-num =return-type] (match =fn-type
[::&type/function ?fargs ?freturn]
(let [needs-num (count ?fargs)
provides-num (count =args)]
(if (> needs-num provides-num)
[needs-num [::&type/function (drop provides-num ?fargs) ?freturn]]
[needs-num &type/+dont-care-type+])))]]
(return (list [::&/Expression [::static-call needs-num =fn =args] =return-type])))))
_
(exec [=args (mapcat-m analyse ?args)]
(return (list [::&/Expression [::call =fn =args] &type/+dont-care-type+]))))
:else
(fail "Can't call something without a type."))
))
(defn analyse-case [analyse ?variant ?branches]
(exec [=variant (&/analyse-1 analyse ?variant)
_ (assert! (and (> (count ?branches) 0) (even? (count ?branches)))
"Unbalanced branches in \"case'\" expression.")
:let [branches (partition 2 ?branches)
locals-per-branch (map &&case/locals (map first branches))
max-locals (reduce max 0 (map count locals-per-branch))]
base-register &&env/next-local-idx
=bodies (map-m (partial &&case/analyse-branch &/analyse-1 max-locals)
(map vector locals-per-branch (map second branches)))
=body-types (map-m &/expr-type =bodies)
=case-type (reduce-m &type/merge [::&type/Nothing] =body-types)
:let [=branches (map vector (map first branches) =bodies)]]
(return (list [::&/Expression [::case =variant base-register max-locals =branches] =case-type]))))
(defn analyse-lambda [analyse ?self ?arg ?body]
(exec [[_ =arg =return :as =function] &type/fresh-function
[=scope =captured =body] (&&lambda/with-lambda ?self =function
?arg =arg
(&/analyse-1 analyse ?body))
=body-type (&/expr-type =body)
=function (exec [_ (&type/solve =return =body-type)]
(&type/clean =function))
:let [=lambda (match =body
[::&/Expression [::lambda ?sub-scope ?sub-captured ?sub-args ?sub-body] =body-type]
[::&/Expression [::lambda =scope =captured (cons ?arg ?sub-args) (&&lambda/raise-expr ?arg ?sub-body)] =body-type]
_
[::&/Expression [::lambda =scope =captured (list ?arg) =body] =body-type])]]
(return (list [::&/Expression =lambda =function]))))
(defn analyse-def [analyse ?name ?value]
;; (prn 'analyse-def ?name ?value)
(exec [def?? (&&env/defined? ?name)]
(if def??
(fail (str "Can't redefine " ?name))
(exec [ann?? (&&env/annotated? ?name)
$module &util/get-module-name
=value (&/analyse-1 analyse ?value)
=value (match =value
[::&/Expression =value-form =value-type]
(return (match =value-form
[::lambda ?old-scope ?env ?args ?body]
[::&/Expression [::lambda (list ?name $module) ?env ?args ?body] =value-type]
_
=value))
_
(fail ""))
=value-type (&/expr-type =value)
_ (if ann??
(return nil)
(&&env/annotate ?name ::public false =value-type))
_ (&&env/define ?name)]
(return (list [::&/Statement [::def ?name =value]]))))))
(defn analyse-declare-macro [?ident]
(exec [_ (&&env/annotate ?ident ::public true [::&type/Any])]
(return (list))))
(defn analyse-require [analyse ?path]
(assert false)
(return (list)))
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