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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.analyser.module
(:refer-clojure :exclude [alias])
(:require (clojure [string :as string]
[template :refer [do-template]])
clojure.core.match
clojure.core.match.array
(lux [base :as & :refer [deftuple |let |do return return* fail fail* |case]]
[type :as &type]
[host :as &host])
[lux.host.generics :as &host-generics]
(lux.analyser [meta :as &meta])))
;; [Utils]
(deftuple
["module-aliases"
"defs"
"imports"
"tags"
"types"])
(def ^:private +init+
(&/T [;; "lux;module-aliases"
(&/|table)
;; "lux;defs"
(&/|table)
;; "lux;imports"
&/$Nil
;; "lux;tags"
(&/|table)
;; "lux;types"
(&/|table)]
))
;; [Exports]
(defn add-import [module]
"(-> Text (Lux Null))"
(|do [current-module &/get-module-name]
(fn [state]
(return* (&/update$ &/$modules
(fn [ms]
(&/|update current-module
(fn [m] (&/update$ $imports (partial &/$Cons module) m))
ms))
state)
nil))))
(defn set-imports [imports]
"(-> (List Text) (Lux Null))"
(|do [current-module &/get-module-name]
(fn [state]
(return* (&/update$ &/$modules
(fn [ms]
(&/|update current-module
(fn [m] (&/set$ $imports imports m))
ms))
state)
nil))))
(defn define [module name def-type def-meta def-value]
(fn [state]
(when (and (= "Macro" name) (= "lux" module))
(&type/set-macro-type! def-value))
(|case (&/get$ &/$envs state)
(&/$Cons ?env (&/$Nil))
(return* (->> state
(&/update$ &/$modules
(fn [ms]
(&/|update module
(fn [m]
(&/update$ $defs
#(&/|put name (&/T [def-type def-meta def-value]) %)
m))
ms))))
nil)
_
(fail* (str "[Analyser Error] Can't create a new global definition outside of a global environment: " module ";" name)))))
(defn def-type [module name]
"(-> Text Text (Lux Type))"
(fn [state]
(if-let [$module (->> state (&/get$ &/$modules) (&/|get module))]
(if-let [$def (->> $module (&/get$ $defs) (&/|get name))]
(|let [[?type ?meta ?value] $def]
(return* state ?type))
(fail* (str "[Analyser Error] Unknown definition: " (str module ";" name))))
(fail* (str "[Analyser Error] Unknown module: " module)))))
(defn type-def [module name]
"(-> Text Text (Lux [Bool Type]))"
(fn [state]
(if-let [$module (->> state (&/get$ &/$modules) (&/|get module))]
(if-let [$def (->> $module (&/get$ $defs) (&/|get name))]
(|let [[?type ?meta ?value] $def]
(|case (&meta/meta-get &meta/type?-tag ?meta)
(&/$Some _)
(return* state (&/T [(|case (&meta/meta-get &meta/export?-tag ?meta)
(&/$Some _)
true
_
false)
?value]))
_
(fail* (str "[Analyser Error] Not a type: " (&/ident->text (&/T [module name]))))))
(fail* (str "[Analyser Error] Unknown definition: " (&/ident->text (&/T [module name])))))
(fail* (str "[Analyser Error] Unknown module: " module)))))
(defn exists? [name]
"(-> Text (Lux Bool))"
(fn [state]
(return* state
(->> state (&/get$ &/$modules) (&/|contains? name)))))
(defn dealias [name]
(|do [current-module &/get-module-name]
(fn [state]
(if-let [real-name (->> state (&/get$ &/$modules) (&/|get current-module) (&/get$ $module-aliases) (&/|get name))]
(return* state real-name)
(fail* (str "Unknown alias: " name))))))
(defn alias [module alias reference]
(fn [state]
(if-let [real-name (->> state (&/get$ &/$modules) (&/|get module) (&/get$ $module-aliases) (&/|get alias))]
(fail* (str "Can't re-use alias \"" alias "\" @ " module))
(return* (->> state
(&/update$ &/$modules
(fn [ms]
(&/|update module
#(&/update$ $module-aliases
(fn [aliases]
(&/|put alias reference aliases))
%)
ms))))
nil))))
(defn find-def [module name]
(|do [current-module &/get-module-name]
(fn [state]
(if-let [$module (->> state (&/get$ &/$modules) (&/|get module))]
(if-let [$def (->> $module (&/get$ $defs) (&/|get name))]
(|let [[?type ?meta ?value] $def]
(if (.equals ^Object current-module module)
(|case (&meta/meta-get &meta/alias-tag ?meta)
(&/$Some (&/$IdentM [?r-module ?r-name]))
((find-def ?r-module ?r-name)
state)
_
(return* state (&/T [(&/T [module name]) $def])))
(|case (&meta/meta-get &meta/export?-tag ?meta)
(&/$Some (&/$BoolM true))
(return* state (&/T [(&/T [module name]) $def]))
_
(fail* (str "[Analyser Error] Can't use unexported definition: " (str module &/+name-separator+ name))))))
(fail* (str "[Analyser Error] Definition does not exist: " (str module &/+name-separator+ name))))
(fail* (str "[Analyser Error] Module doesn't exist: " module))))))
(defn ensure-type-def [def-data]
"(-> DefData (Lux Type))"
(|let [[?type ?meta ?value] def-data]
(|case (&meta/meta-get &meta/type?-tag ?meta)
(&/$Some _)
(return ?type)
_
(fail (str "[Analyser Error] Not a type definition: " (&/adt->text def-data))))))
(defn defined? [module name]
(&/try-all% (&/|list (|do [_ (find-def module name)]
(return true))
(return false))))
(def imports
(|do [module &/get-module-name]
(fn [state]
(return* state (->> state (&/get$ &/$modules) (&/|get module) (&/get$ $imports))))))
(defn create-module [name]
"(-> Text (Lux Null))"
(fn [state]
(return* (&/update$ &/$modules #(&/|put name +init+ %) state) nil)))
(defn enter-module [name]
"(-> Text (Lux Null))"
(fn [state]
(return* (->> state
(&/update$ &/$modules #(&/|put name +init+ %))
(&/set$ &/$envs (&/|list (&/env name))))
nil)))
(do-template [<name> <tag> <type>]
(defn <name> [module]
<type>
(fn [state]
(if-let [=module (->> state (&/get$ &/$modules) (&/|get module))]
(return* state (&/get$ <tag> =module))
(fail* (str "[Lux Error] Unknown module: " module)))
))
tags-by-module $tags "(-> Text (Lux (List (, Text (, Int (List Text) Type)))))"
types-by-module $types "(-> Text (Lux (List (, Text (, (List Text) Type)))))"
)
(defn ensure-undeclared-tags [module tags]
(|do [tags-table (tags-by-module module)
_ (&/map% (fn [tag]
(if (&/|get tag tags-table)
(fail (str "[Analyser Error] Can't re-declare tag: " (&/ident->text (&/T [module tag]))))
(return nil)))
tags)]
(return nil)))
(defn ensure-undeclared-type [module name]
(|do [types-table (types-by-module module)
_ (&/assert! (nil? (&/|get name types-table))
(str "[Analyser Error] Can't re-declare type: " (&/ident->text (&/T [module name]))))]
(return nil)))
(defn declare-tags [module tag-names was-exported? type]
"(-> Text (List Text) Bool Type (Lux Null))"
(|do [_ (ensure-undeclared-tags module tag-names)
type-name (&type/type-name type)
:let [[_module _name] type-name]
_ (&/assert! (= module _module)
(str "[Module Error] Can't define tags for a type belonging to a foreign module: " (&/ident->text type-name)))
_ (ensure-undeclared-type _module _name)]
(fn [state]
(if-let [=module (->> state (&/get$ &/$modules) (&/|get module))]
(let [tags (&/|map (fn [tag-name] (&/T [module tag-name])) tag-names)]
(return* (&/update$ &/$modules
(fn [=modules]
(&/|update module
#(->> %
(&/set$ $tags (&/fold (fn [table idx+tag-name]
(|let [[idx tag-name] idx+tag-name]
(&/|put tag-name (&/T [idx tags was-exported? type]) table)))
(&/get$ $tags %)
(&/enumerate tag-names)))
(&/update$ $types (partial &/|put _name (&/T [tags was-exported? type]))))
=modules))
state)
nil))
(fail* (str "[Lux Error] Unknown module: " module))))))
(defn ensure-can-see-tag [module tag-name]
"(-> Text Text (Lux Unit))"
(|do [current-module &/get-module-name]
(fn [state]
(if-let [=module (->> state (&/get$ &/$modules) (&/|get module))]
(if-let [^objects idx+tags+exported+type (&/|get tag-name (&/get$ $tags =module))]
(|let [[?idx ?tags ?exported ?type] idx+tags+exported+type]
(if (or ?exported
(= module current-module))
(return* state &/unit-tag)
(fail* (str "Can't access tag #" (&/ident->text (&/T [module tag-name])) " from module " current-module))))
(fail* (str "[Module Error] Unknown tag: " (&/ident->text (&/T [module tag-name])))))
(fail* (str "[Module Error] Unknown module: " module))))))
(do-template [<name> <part> <doc>]
(defn <name> [module tag-name]
<doc>
(fn [state]
(if-let [=module (->> state (&/get$ &/$modules) (&/|get module))]
(if-let [^objects idx+tags+exported+type (&/|get tag-name (&/get$ $tags =module))]
(|let [[?idx ?tags ?exported ?type] idx+tags+exported+type]
(return* state <part>))
(fail* (str "[Module Error] Unknown tag: " (&/ident->text (&/T [module tag-name])))))
(fail* (str "[Module Error] Unknown module: " module)))))
tag-index ?idx "(-> Text Text (Lux Int))"
tag-group ?tags "(-> Text Text (Lux (List Ident)))"
tag-type ?type "(-> Text Text (Lux Type))"
)
(def defs
(|do [module &/get-module-name]
(fn [state]
(return* state
(->> state (&/get$ &/$modules) (&/|get module) (&/get$ $defs)
(&/|map (fn [kv]
(|let [[k [?def-type ?def-meta ?def-value]] kv]
(|case (&meta/meta-get &meta/alias-tag ?def-meta)
(&/$Some (&/$IdentM [?r-module ?r-name]))
(&/T [k (str ?r-module ";" ?r-name)])
_
(&/T [k ""])
)))))))))
(do-template [<name> <type> <tag> <desc>]
(defn <name> [module name meta type]
(|case (&meta/meta-get <tag> meta)
(&/$Some (&/$BoolM true))
(&/try-all% (&/|list (&type/check <type> type)
(fail (str "[Analyser Error] Can't tag as lux;" <desc> "? if it's not a " <desc> ": " (str module ";" name)))))
_
(return nil)))
test-type &type/Type &meta/type?-tag "type"
test-macro &type/Macro &meta/macro?-tag "macro"
)
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