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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 [exec return return* fail fail* |let]]
[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])))
;; [Resources]
(defn analyse-tuple [analyse ?elems]
(exec [=elems (&/flat-map% analyse ?elems)
=elems-types (&/map% &&/expr-type =elems)
;; :let [_ (prn 'analyse-tuple =elems)]
]
(return (&/|list (&/V "Expression" (&/T (&/V "tuple" =elems) (&/V "lux;TTuple" =elems-types)))))))
(defn analyse-record [analyse ?elems]
(exec [=elems (&/map% (fn [kv]
(matchv ::M/objects [kv]
[[k v]]
(exec [=v (&&/analyse-1 analyse v)]
(return (to-array [k =v])))))
?elems)
=elems-types (&/map% (fn [kv]
(matchv ::M/objects [kv]
[[k v]]
(exec [=v (&&/expr-type v)]
(return (to-array [k =v])))))
=elems)
;; :let [_ (prn 'analyse-tuple =elems)]
]
(return (&/|list (&/V "Expression" (&/T (&/V "lux;record" =elems) (&/V "lux;TRecord" =elems-types)))))))
(defn ^:private resolve-global [ident state]
(|let [[?module ?name] ident
ident* (str ?module ";" ?name)]
(if-let [global (->> state (&/get$ "lux;global-env") &/from-some (&/get$ "lux;locals") (&/get$ "lux;mappings") (&/|get ident*))]
(return* state (&/|list global))
(fail* (str "[Analyser Error] Unresolved identifier: " ident*)))))
(defn analyse-ident [analyse ident]
;; (prn 'analyse-ident ident)
(|let [[?module ?name] ident]
(do ;; (prn 'analyse-ident ?module ?name)
(exec [module-name &/get-module-name]
(if (not= module-name ?module)
(partial resolve-global ident)
(fn [state]
;; (when (and (= "lux" ?module)
;; (= "output" ?name))
;; (prn (&/show-state state)))
;; (prn 'module-name module-name)
;; (prn '(&/get$ "local-envs" state) (&/get$ "local-envs" state))
;; (prn '(&/->seq (&/get$ "local-envs" state)) (&/->seq (&/get$ "local-envs" state)))
;; (println (&/show-state state))
(let [stack (&/get$ "lux;local-envs" state)]
(matchv ::M/objects [stack]
[["lux;Nil" _]]
(resolve-global ident state)
[["lux;Cons" [top stack*]]]
(if-let [=bound (or (->> stack &/|head (&/get$ "lux;locals") (&/get$ "lux;mappings") (&/|get ?name))
(->> stack &/|head (&/get$ "lux;closure") (&/get$ "lux;mappings") (&/|get ?name)))]
(return* state (&/|list =bound))
(|let [no-binding? #(and (->> % (&/get$ "lux;locals") (&/get$ "lux;mappings") (&/|contains? ?name) not)
(->> % (&/get$ "lux;closure") (&/get$ "lux;mappings") (&/|contains? ?name) not))
[inner outer] (&/|split-with no-binding? stack*)]
(matchv ::M/objects [outer]
[["lux;Nil" _]]
(resolve-global ident state)
[["lux;Cons" [top-outer _]]]
(|let [in-stack (&/|cons top inner)
scopes (&/|tail (&/folds #(&/|cons (&/get$ "lux;name" %2) %1)
(&/|map #(&/get$ "lux;name" %) outer)
(&/|reverse in-stack)))
;; _ (prn 'in-stack module-name ident (&/->seq (&/|map #(&/get$ "name" %) in-stack)) scopes)
[=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 ?name))
(->> top-outer (&/get$ "lux;closure") (&/get$ "lux;mappings") (&/|get ?name)))
(&/|list))
(&/zip2 (&/|reverse in-stack) scopes))]
(return* (&/set$ "lux;local-envs" (&/|++ inner* outer) state) (&/|list =local)))
)))
))
))
))))
(defn ^:private analyse-apply* [analyse =fn ?args]
(exec [=args (&/flat-map% analyse ?args)
=fn-type (&&/expr-type =fn)
[=apply _] (&/fold% (fn [[=fn =fn-type] =input]
(exec [;; :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)]
(return (&/|list =apply))))
(defn analyse-apply [analyse =fn ?args]
;; (prn 'analyse-apply1 (aget =fn 0))
(exec [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]]]
(exec [macro? (&&def/macro? ?module ?name)]
(if macro?
(let [macro-class (&host/location (&/|list ?module ?name))]
(exec [macro-expansion (¯o/expand loader macro-class ?args)
output (&/flat-map% analyse macro-expansion)]
(return output)))
(analyse-apply* analyse =fn ?args)))
[_]
(analyse-apply* analyse =fn ?args)))
[_]
(fail "[Analyser Error] Can't call a statement!"))
))
(defn analyse-case [analyse ?value ?branches]
;; (prn 'analyse-case (aget ?branches 0) (aget ?branches 1 1 0)
;; (&/->seq ?branches))
;; (prn 'analyse-case (&/show-ast ?value))
(exec [:let [num-branches (&/|length ?branches)
;; _ (prn 'analyse-case ?value (&/|length ?branches)
;; (and (> num-branches 0) (even? num-branches)))
]
_ (&/assert! (and (> num-branches 0) (even? num-branches))
"[Analyser Error] Unbalanced branches in \"case'\" expression.")
:let [branches (&/|as-pairs ?branches)
;; _ (prn '(&/|length branches) (&/|length branches))
locals-per-branch (&/|map (comp &&case/locals &/|first) branches)
max-locals (&/fold max 0 (&/|map &/|length locals-per-branch))]
;; :let [_ (prn '[branches locals-per-branch max-locals] [branches locals-per-branch max-locals])]
base-register &&env/next-local-idx
;; :let [_ (prn 'base-register base-register)]
=value (&&/analyse-1 analyse ?value)
;; :let [_ (prn '=value =value)]
=bodies (&/map% (partial &&case/analyse-branch analyse max-locals)
(&/zip2 locals-per-branch (&/|map &/|second branches)))
;; :let [_ (prn '=bodies =bodies)]
;; :let [_ (prn 'analyse-case/=bodies =bodies)]
=body-types (&/map% &&/expr-type =bodies)
=case-type (&/fold% &type/merge (&/V "lux;TNothing" nil) =body-types)
:let [=branches (&/zip2 (&/|map &/|first branches) =bodies)]]
(return (&/|list (&/V "Expression" (&/T (&/V "case" (&/T =value base-register max-locals =branches))
=case-type))))))
(defn analyse-lambda [analyse ?self ?arg ?body]
(exec [=lambda-type* &type/fresh-lambda]
(matchv ::M/objects [=lambda-type*]
[["lux;TLambda" [=arg =return]]]
(exec [[=scope =captured =body] (&&lambda/with-lambda ?self =lambda-type*
?arg =arg
(&&/analyse-1 analyse ?body))
=body-type (&&/expr-type =body)
;; _ =body-type
=lambda-type (exec [_ (&type/solve =return =body-type)
=lambda-type** (&type/clean =return =lambda-type*)]
(&type/clean =arg =lambda-type**))
;; :let [_ (prn '=lambda-type =lambda-type)]
]
(return (&/|list (&/V "Expression" (&/T (&/V "lambda" (&/T =scope =captured ?arg =body)) =lambda-type))))))))
(defn analyse-get [analyse ?slot ?record]
(exec [=record (&&/analyse-1 analyse ?record)
=record-type (&&/expr-type =record)
=slot-type (&type/slot-type =record-type ?slot)]
(return (&/|list (&/V "Expression" (&/T (&/V "get" (?slot =record)) =slot-type))))))
(defn analyse-set [analyse ?slot ?value ?record]
(exec [=value (&&/analyse-1 analyse ?value)
=record (&&/analyse-1 analyse ?record)
=record-type (&&/expr-type =record)
=slot-type (&type/slot-type =record-type ?slot)
_ (&type/solve =slot-type =value)]
(return (&/|list (&/V "Expression" (&/T (&/V "set" (&/T ?slot =value =record)) =slot-type))))))
(defn analyse-def [analyse ?name ?value]
;; (prn 'analyse-def ?name ?value)
(exec [module-name &/get-module-name]
(&/if% (&&def/defined? module-name ?name)
(fail (str "[Analyser Error] Can't redefine " ?name))
(exec [=value (&&/analyse-1 analyse ?value)
=value-type (&&/expr-type =value)
_ (&&def/define module-name ?name =value-type)]
(return (&/|list (&/V "Statement" (&/V "def" (&/T ?name =value)))))))))
(defn analyse-declare-macro [ident]
(|let [[?module ?name] ident]
(exec [module-name &/get-module-name]
(if (= ?module module-name)
(exec [_ (&&def/declare-macro ?module ?name)]
(return (&/|list)))
(fail "Can't declare macros from foreign modules.")))))
(defn analyse-import [analyse ?path]
(assert false)
(return (&/|list)))
(defn analyse-check [analyse eval! ?type ?value]
(exec [=type (&&/analyse-1 analyse ?type)
=type-type (&&/expr-type =type)
_ (&type/solve &type/+type+ =type-type)
==type (eval! =type)
=value (&&/analyse-1 analyse ?value)]
(matchv ::M/objects [=value]
[["Expression" [?expr ?expr-type]]]
(exec [_ (&type/solve ==type ?expr-type)]
(return (&/V "Expression" (&/T ?expr ==type)))))))
(defn analyse-coerce [analyse eval! ?type ?value]
(exec [=type (&&/analyse-1 analyse ?type)
=type-type (&&/expr-type =type)
_ (&type/solve &type/+type+ =type-type)
==type (eval! =type)
=value (&&/analyse-1 analyse ?value)]
(matchv ::M/objects [=value]
[["Expression" [?expr ?expr-type]]]
(return (&/V "Expression" (&/T ?expr ==type))))))
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