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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.type.host
(:require clojure.core.match
clojure.core.match.array
(lux [base :as & :refer [|do return* return fail fail* assert! |let |case]]))
(:import (java.lang.reflect GenericArrayType
ParameterizedType
TypeVariable
WildcardType)))
;; [Exports]
(def array-data-tag "#Array")
(def null-data-tag "#Null")
;; [Utils]
(defn ^:private trace-lineage* [^Class super-class ^Class sub-class]
"(-> Class Class (List Class))"
;; Either they're both interfaces, of they're both classes
(cond (.isInterface sub-class)
(let [interface<=interface? #(if (or (= super-class %)
(.isAssignableFrom super-class %))
%
nil)]
(loop [sub-class sub-class
stack (&/|list)]
(let [super-interface (some interface<=interface?
(.getInterfaces sub-class))]
(if (= super-class super-interface)
(&/Cons$ super-interface stack)
(let [super* (.getSuperclass sub-class)]
(recur super* (&/Cons$ super* stack)))))))
(.isInterface super-class)
(let [class<=interface? #(if (= super-class %) % nil)]
(loop [sub-class sub-class
stack (&/|list)]
(if-let [super-interface (some class<=interface? (.getInterfaces sub-class))]
(&/Cons$ super-interface stack)
(let [super* (.getSuperclass sub-class)]
(recur super* (&/Cons$ super* stack))))))
:else
(loop [sub-class sub-class
stack (&/|list)]
(let [super* (.getSuperclass sub-class)]
(if (= super* super-class)
(&/Cons$ super* stack)
(recur super* (&/Cons$ super* stack)))))))
(defn ^:private trace-lineage [^Class sub-class ^Class super-class]
"(-> Class Class (List Class))"
(if (= sub-class super-class)
(&/|list)
(&/|reverse (trace-lineage* super-class sub-class))))
(let [matcher (fn [m ^TypeVariable jt lt] (&/Cons$ (&/T (.getName jt) lt) m))]
(defn ^:private match-params [sub-type-params params]
(assert (and (= (&/|length sub-type-params) (&/|length params))
(&/|every? (partial instance? TypeVariable) sub-type-params)))
(&/fold2 matcher (&/|table) sub-type-params params)))
;; [Exports]
(let [class-name-re #"((\[+)L([\.a-zA-Z0-9]+);|([\.a-zA-Z0-9]+)|(\[+)([ZBSIJFDC]))"
Unit (&/V &/$TupleT (&/|list))
jprim->lprim (fn [prim]
(case prim
"Z" "boolean"
"B" "byte"
"S" "short"
"I" "int"
"J" "long"
"F" "float"
"D" "double"
"C" "char"))]
(defn class->type [^Class class]
"(-> Class Type)"
(if-let [[_ _ arr-obrackets arr-obase simple-base arr-pbrackets arr-pbase] (re-find class-name-re (.getName class))]
(let [base (or arr-obase simple-base (jprim->lprim arr-pbase))]
(if (.equals "void" base)
Unit
(reduce (fn [inner _] (&/V &/$DataT (&/T array-data-tag (&/|list inner))))
(&/V &/$DataT (&/T base &/Nil$))
(range (count (or arr-obrackets arr-pbrackets "")))))
))))
;; (-> String (.getMethod "getBytes" (into-array Class [])) .getReturnType)
;; (-> String (.getMethod "getBytes" (into-array Class [])) ^Class (.getGenericReturnType)
;; .getName (->> (re-find #"((\[+)L([\.a-zA-Z0-9]+);|([\.a-zA-Z0-9]+)|(\[+)([ZBSIJFDC]))")))
(defn instance-param [existential matchings refl-type]
"(-> (List (, Text Type)) (^ java.lang.reflect.Type) (Lux Type))"
(cond (instance? Class refl-type)
(return (class->type refl-type))
(instance? GenericArrayType refl-type)
(let [inner-type (instance-param existential matchings (.getGenericComponentType ^GenericArrayType refl-type))]
(return (&/V &/$DataT (&/T array-data-tag (&/|list inner-type)))))
(instance? ParameterizedType refl-type)
(|do [:let [refl-type* ^ParameterizedType refl-type]
params* (->> refl-type*
.getActualTypeArguments
seq &/->list
(&/map% (partial instance-param existential matchings)))]
(return (&/V &/$DataT (&/T (->> refl-type* ^Class (.getRawType) .getName)
params*))))
(instance? TypeVariable refl-type)
(let [gvar (.getName ^TypeVariable refl-type)]
(if-let [m-type (&/|get gvar matchings)]
(return m-type)
(fail (str "[Type Error] Unknown generic type variable: " gvar))))
(instance? WildcardType refl-type)
(if-let [bound (->> ^WildcardType refl-type .getUpperBounds seq first)]
(instance-param existential matchings bound)
existential)))
;; [Utils]
(defn ^:private translate-params [existential super-type-params sub-type-params params]
"(-> (List (^ java.lang.reflect.Type)) (List (^ java.lang.reflect.Type)) (List Type) (Lux (List Type)))"
(|let [matchings (match-params sub-type-params params)]
(&/map% (partial instance-param existential matchings) super-type-params)))
(defn ^:private raise* [existential sub+params ^Class super]
"(-> (, Class (List Type)) Class (Lux (, Class (List Type))))"
(|let [[^Class sub params] sub+params]
(if (.isInterface super)
(|do [:let [super-params (->> sub
.getGenericInterfaces
(some #(if (= super (if (instance? Class %) % (.getRawType ^ParameterizedType %)))
(if (instance? Class %)
(&/|list)
(->> ^ParameterizedType % .getActualTypeArguments seq &/->list))
nil)))]
params* (translate-params existential
super-params
(->> sub .getTypeParameters seq &/->list)
params)]
(return (&/T super params*)))
(let [super* (.getGenericSuperclass sub)]
(cond (instance? Class super*)
(return (&/T super* (&/|list)))
(instance? ParameterizedType super*)
(|do [params* (translate-params existential
(->> ^ParameterizedType super* .getActualTypeArguments seq &/->list)
(->> sub .getTypeParameters seq &/->list)
params)]
(return (&/T super params*)))
:else
(assert false (prn-str super* (class super*) [sub super])))))))
(defn ^:private raise [existential lineage class params]
"(-> (List Class) Class (List Type) (Lux (, Class (List Type))))"
(&/fold% (partial raise* existential) (&/T class params) lineage))
;; [Exports]
(defn ->super-type [existential class-loader super-class sub-class sub-params]
"(-> Text Text (List Type) (Lux Type))"
(let [super-class+ (Class/forName super-class true class-loader)
sub-class+ (Class/forName sub-class true class-loader)]
(if (.isAssignableFrom super-class+ sub-class+)
(let [lineage (trace-lineage sub-class+ super-class+)]
(|do [[^Class sub-class* sub-params*] (raise existential lineage sub-class+ sub-params)]
(return (&/V &/$DataT (&/T (.getName sub-class*) sub-params*)))))
(fail (str "[Type Error] Classes don't have a subtyping relationship: " sub-class " </= " super-class)))))
(defn as-obj [class]
(case class
"boolean" "java.lang.Boolean"
"byte" "java.lang.Byte"
"short" "java.lang.Short"
"int" "java.lang.Integer"
"long" "java.lang.Long"
"float" "java.lang.Float"
"double" "java.lang.Double"
"char" "java.lang.Character"
;; else
class))
(let [primitive-types #{"boolean" "byte" "short" "int" "long" "float" "double" "char"}]
(defn primitive-type? [type-name]
(contains? primitive-types type-name)))
(defn check-host-types [check check-error fixpoints existential class-loader invariant?? expected actual]
(|let [[e!name e!params] expected
[a!name a!params] actual]
(cond (= "java.lang.Object" e!name)
(return (&/T fixpoints nil))
(= null-data-tag a!name)
(if (not (primitive-type? e!name))
(return (&/T fixpoints nil))
(fail (check-error (&/V &/$DataT expected) (&/V &/$DataT actual))))
(= null-data-tag e!name)
(if (= null-data-tag a!name)
(return (&/T fixpoints nil))
(fail (check-error (&/V &/$DataT expected) (&/V &/$DataT actual))))
(and (= array-data-tag e!name)
(not= array-data-tag a!name))
(fail (check-error (&/V &/$DataT expected) (&/V &/$DataT actual)))
:else
(let [e!name (as-obj e!name)
a!name (as-obj a!name)]
(cond (.equals ^Object e!name a!name)
(if (= (&/|length e!params) (&/|length a!params))
(|do [_ (&/map2% check e!params a!params)]
(return (&/T fixpoints nil)))
(fail (str "[Type Error] Amounts of generic parameters don't match: " e!name "(" (&/|length e!params) ")" " vs " a!name "(" (&/|length a!params) ")")))
(not invariant??)
(|do [actual* (->super-type existential class-loader e!name a!name a!params)]
(check (&/V &/$DataT expected) actual*))
:else
(fail (str "[Type Error] Names don't match: " e!name " =/= " a!name)))))))
(let [Void$ (&/V &/$VariantT (&/|list))
gen-type (constantly Void$)]
(defn dummy-gtype [class]
(|do [class-loader &/loader]
(try (|let [=class (Class/forName class true class-loader)
params (->> =class .getTypeParameters seq &/->list (&/|map gen-type))]
(return (&/V &/$DataT (&/T class params))))
(catch Exception e
(fail (str "[Type Error] Unknown type: " class)))))))
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