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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.compiler.cache
(:refer-clojure :exclude [load])
(:require [clojure.string :as string]
[clojure.java.io :as io]
clojure.core.match
clojure.core.match.array
(lux [base :as & :refer [|do return* return fail fail* |case |let]]
[type :as &type]
[host :as &host])
[lux.host.generics :as &host-generics]
(lux.analyser [base :as &a]
[module :as &a-module]
[meta :as &a-meta])
(lux.compiler [base :as &&]
[io :as &&io]))
(:import (java.io File
BufferedOutputStream
FileOutputStream)
(java.lang.reflect Field)))
;; [Utils]
(defn ^:private read-file [^File file]
"(-> File (Array Byte))"
(with-open [reader (io/input-stream file)]
(let [length (.length file)
buffer (byte-array length)]
(.read reader buffer 0 length)
buffer)))
(defn ^:private clean-file [^File file]
"(-> File (,))"
(doseq [^File f (seq (.listFiles file))
:when (not (.isDirectory f))]
(.delete f)))
(defn ^:private get-field [^String field-name ^Class class]
"(-> Text Class Object)"
(-> class ^Field (.getField field-name) (.get nil)))
;; [Resources]
(def module-class (str &/module-class-name ".class"))
(defn cached? [module]
"(-> Text Bool)"
(.exists (new File (str &&/output-dir "/" (&host/->module-class module) "/" module-class))))
(defn delete [module]
"(-> Text (Lux Null))"
(fn [state]
(do (clean-file (new File (str &&/output-dir "/" (&host/->module-class module))))
(return* state nil))))
(defn clean [state]
"(-> Compiler Null)"
(let [needed-modules (->> state (&/get$ &/$modules) &/|keys &/->seq set)
outdated? #(-> ^File % .getName (string/replace &host/module-separator "/") (->> (contains? needed-modules)) not)
outdate-files (->> &&/output-dir (new File) .listFiles seq (filter outdated?))
program-file (new File &&/output-package)]
(when (.exists program-file)
(.delete program-file))
(doseq [f outdate-files]
(clean-file f))
nil))
(let [->regex (fn [text] (re-pattern (java.util.regex.Pattern/quote text)))
import-separator-re (->regex &&/import-separator)
type-separator-re (->regex &&/type-separator)
tag-separator-re (->regex &&/tag-separator)
def-separator-re (->regex &&/def-separator)
tag-group-separator-re (->regex &&/tag-group-separator)]
(defn load [module module-hash compile-module]
"(-> Text Int (-> Text (Lux (,))) (Lux Bool))"
(|do [loader &/loader
!classes &/classes
already-loaded? (&a-module/exists? module)
_modules &/modules
:let [redo-cache (|do [_ (delete module)
_ (compile-module module)]
(return false))]]
(if already-loaded?
(return true)
(if (cached? module)
(let [module* (&host-generics/->class-name module)
module-path (str &&/output-dir "/" module)
class-name (str module* "._")
^Class module-meta (do (swap! !classes assoc class-name (read-file (File. (str module-path "/_.class"))))
(&&/load-class! loader class-name))]
(if (and (= module-hash (get-field &/hash-field module-meta))
(= &&/version (get-field &/compiler-field module-meta)))
(let [imports (string/split (get-field &/imports-field module-meta) import-separator-re)]
(|do [loads (&/map% (fn [_import]
(|do [content (&&io/read-file (str _import ".lux"))
_ (load _import (hash content) compile-module)]
(&/cached-module? _import)))
(if (= [""] imports)
&/Nil$
(&/->list imports)))]
(if (->> loads &/->seq (every? true?))
(do (doseq [^File file (seq (.listFiles (File. module-path)))
:when (not (.isDirectory file))
:let [file-name (.getName file)]
:when (not= module-class file-name)]
(let [real-name (second (re-find #"^(.*)\.class$" file-name))
bytecode (read-file file)]
(swap! !classes assoc (str module* "." real-name) bytecode)))
(let [defs (string/split (get-field &/defs-field module-meta) def-separator-re)
tag-groups (let [all-tags (get-field &/tags-field module-meta)]
(if (= "" all-tags)
&/Nil$
(-> all-tags
(string/split tag-group-separator-re)
(->> (map (fn [_group]
(let [[_type _tags] (string/split _group type-separator-re)]
(&/T [_type (&/->list (string/split (or _tags "") tag-separator-re))])))))
&/->list)))]
(|do [_ (&a-module/enter-module module)
_ (&/flag-cached-module module)
_ (&a-module/set-imports imports)
_ (&/map% (fn [_def]
(let [[_name _alias] (string/split _def #" ")]
(if (= nil _alias)
(let [def-class (&&/load-class! loader (str module* "." (&host/def-name _name)))
def-meta (get-field &/meta-field def-class)
def-type (|case (&a-meta/meta-get &a-meta/type?-tag def-meta)
(&/$Some (&/$BoolM true))
&type/Type
_
(get-field &/type-field def-class))
def-value (get-field &/value-field def-class)]
(&a-module/define module _name def-type def-meta def-value))
(let [[_ __module __name] (re-find #"^(.*);(.*)$" _alias)
def-class (&&/load-class! loader (str (&host-generics/->class-name __module) "." (&host/def-name __name)))
def-type (get-field &/type-field def-class)
def-meta (&/|list (&/T [&a-meta/alias-tag (&/V &/$IdentM (&/T [__module __name]))]))
def-value (get-field &/value-field def-class)]
(&a-module/define module _name def-type def-meta def-value)))
))
(if (= [""] defs)
&/Nil$
(&/->list defs)))
_ (&/map% (fn [group]
(|let [[_type _tags] group]
(|do [=type (&a-module/type-def module _type)]
(&a-module/declare-tags module _tags =type))))
tag-groups)]
(return true))))
redo-cache)))
redo-cache))
redo-cache)))))
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