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(ns lang.analyser
(:refer-clojure :exclude [resolve])
(:require [clojure.core.match :refer [match]]
(lang [util :as &util :refer [exec return* return fail fail*
repeat-m try-m try-all-m map-m
apply-m within]]
[parser :as &parser]
[type :as &type])))
(declare analyse-form)
;; [Util]
(defn ^:private with-env [env monad]
(fn [state]
(let [=return (monad (update-in state [:env] merge env))]
(match =return
[::&util/ok [?state ?value]]
[::&util/ok [(assoc ?state :env (:env state)) ?value]]
_
=return))))
(def ^:private module-name
(fn [state]
[::&util/ok [state (:name state)]]))
(defn ^:private resolve [ident]
(fn [state]
(if-let [=ident (get-in state [:env ident])]
[::&util/ok [state =ident]]
[::&util/failure (str "Unresolved identifier: " ident)])))
(defn ^:private define [name desc]
(fn [state]
[::&util/ok [(assoc-in state [:defs (:name state) name] desc) nil]]))
(defn ^:private annotated [form type]
{:form form
:type type})
(defmacro ^:private defanalyser [name match return]
`(def ~name
(fn [{[token# & left#] :forms :as state#}]
(match token#
~match
(~return (assoc state# :forms left#))
_#
(fail* (str "Unmatched token: " token#))))))
(defn analyse-form* [form]
(fn [state]
(let [old-forms (:forms state)
=return (analyse-form (assoc state :forms (list form)))]
(match =return
[::&util/ok [?state ?value]]
[::&util/ok [(assoc ?state :forms old-forms) ?value]]
_
=return))))
(defanalyser analyse-boolean
[::&parser/boolean ?boolean]
(return (annotated [::literal ?boolean] [::&type/object "java.lang.Boolean" []])))
(defanalyser analyse-string
[::&parser/string ?string]
(return (annotated [::literal ?string] [::&type/object "java.lang.String" []])))
(defanalyser analyse-variant
[::&parser/tagged ?tag ?value]
(exec [=value (analyse-form* ?value)]
(return (annotated [::variant ?tag =value] [::&type/variant ?tag (:type =value)]))))
(defanalyser analyse-ident
[::&parser/ident ?name]
(exec [=ident (resolve ?name)]
(return (annotated [::ident ?name] =ident))))
(defanalyser analyse-ann-class
[::&parser/ann-class ?class ?members]
(return (annotated [::ann-class ?class ?members] ::&type/nothing)))
(defanalyser analyse-static-access
[::&parser/static-access ?class ?member]
(return (annotated [::static-access ?class ?member] ::&type/nothing)))
(defanalyser analyse-dynamic-access
[::&parser/dynamic-access ?object ?member]
(exec [=object (analyse-form* ?object)]
(match ?member
[::&parser/fn-call [::&parser/ident ?method] ?args]
(exec [=args (map-m analyse-form* ?args)]
(return (annotated [::dynamic-access =object [?method =args]] ::&type/nothing))))))
(defanalyser analyse-fn-call
[::&parser/fn-call [::&parser/ident ?fn] ?args]
(exec [name module-name
=args (map-m analyse-form* ?args)]
(return (annotated [::call [name ?fn] =args] ::&type/nothing))))
(defanalyser analyse-if
[::&parser/if ?test ?then ?else]
(exec [=test (analyse-form* ?test)
=then (analyse-form* ?then)
=else (analyse-form* ?else)]
(return (annotated [::if =test =then =else] ::&type/nothing))))
(defanalyser analyse-defclass
[::&parser/defclass ?name ?fields]
(let [=members {:fields (into {} (for [[class field] ?fields]
[field {:access ::public
:type class}]))}
=class [::class ?name =members]]
(exec [name module-name]
(return (annotated [::defclass [name ?name] =members] ::&type/nothing)))))
(defanalyser analyse-definterface
[::&parser/definterface ?name ?members]
(let [=members {:methods (into {} (for [[method [inputs output]] ?members]
[method {:access ::public
:type [inputs output]}]))}
=interface [::interface ?name =members]]
(exec [name module-name]
(return (annotated [::definterface [name ?name] =members] ::&type/nothing)))))
(defanalyser analyse-def
[::&parser/def ?usage ?value]
(match ?usage
[::&parser/ident ?name]
(exec [=value (analyse-form* ?value)
_ (define ?name {:mode ::constant
:access ::public
:type =value})]
(return (annotated [::def ?name =value] ::&type/nothing)))
[::&parser/fn-call [::&parser/ident ?name] ?args]
(let [args (for [a ?args]
(match a
[::&parser/ident ?ident]
?ident))]
(exec [[=function =args =return] (within :types (&type/fresh-function (count args)))
:let [_ (prn '[=function =args =return] [=function =args =return])]
:let [env (-> {}
(assoc ?name =function)
(into (map vector args =args)))
_ (prn 'env env)]
=value (with-env env
(analyse-form* ?value))
:let [_ (prn '=value =value)]
=function (within :types (exec [_ (&type/solve =return (:type =value))]
(&type/clean =function)))
:let [_ (prn '=function =function)]
_ (define ?name {:mode ::function
:access ::public
:type =function})]
(return (annotated [::def [?name args] =value] ::&type/nothing))))
))
(defanalyser analyse-module
[::&parser/module]
(exec [name module-name]
(return (annotated [::module name] ::&type/nothing))))
(def ^:private analyse-form
(try-all-m [analyse-boolean
analyse-string
analyse-variant
analyse-ident
analyse-ann-class
analyse-static-access
analyse-dynamic-access
analyse-fn-call
analyse-if
analyse-defclass
analyse-definterface
analyse-def
analyse-module]))
;; [Interface]
(defn analyse [module-name tokens]
(match ((repeat-m analyse-form) {:name module-name,
:forms tokens
:env {}
:types &type/+init+})
[::&util/ok [?state ?forms]]
(if (empty? (:forms ?state))
?forms
(assert false (str "Unconsumed input: " (pr-str (:forms ?state)))))
[::&util/failure ?message]
(assert false ?message)))
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