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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.lux
(:require (clojure [template :refer [do-template]])
clojure.core.match
clojure.core.match.array
(lux [base :as & :refer [|do return return* fail fail* |let |list |case]]
[parser :as &parser]
[type :as &type]
[host :as &host])
(lux.analyser [base :as &&]
[lambda :as &&lambda]
[case :as &&case]
[env :as &&env]
[module :as &&module]
[record :as &&record])))
;; [Utils]
(defn ^:private count-univq [type]
"(-> Type Int)"
(|case type
(&/$UnivQ env type*)
(inc (count-univq type*))
_
0))
(defn ^:private next-bound-type [type]
"(-> Type Type)"
(&type/Bound$ (->> (count-univq type) (* 2) (+ 1))))
(defn ^:private embed-inferred-input [input output]
"(-> Type Type Type)"
(|case output
(&/$UnivQ env output*)
(&type/Univ$ env (embed-inferred-input input output*))
_
(&type/Lambda$ input output)))
;; [Exports]
(defn analyse-tuple [analyse ?exo-type ?elems]
(|case ?exo-type
(&/$Left exo-type)
(|do [;; :let [_ (println 'analyse-tuple/$Left (&type/show-type exo-type))]
exo-type* (&type/actual-type exo-type)]
(|case exo-type*
(&/$UnivQ _)
(&type/with-var
(fn [$var]
(|do [exo-type** (&type/apply-type exo-type* $var)
[[tuple-type tuple-cursor] tuple-analysis] (&&/cap-1 (analyse-tuple analyse (&/V &/$Left exo-type**) ?elems))
=var (&type/resolve-type $var)
inferred-type (|case =var
(&/$VarT iid)
(|do [:let [=var* (next-bound-type tuple-type)]
_ (&type/set-var iid =var*)
tuple-type* (&type/clean $var tuple-type)]
(return (&type/Univ$ &/Nil$ tuple-type*)))
_
(&type/clean $var tuple-type))]
(return (&/|list (&&/|meta inferred-type tuple-cursor
tuple-analysis))))))
_
(analyse-tuple analyse (&/V &/$Right exo-type*) ?elems)))
(&/$Right exo-type)
(|do [unknown? (&type/unknown? exo-type)]
(if unknown?
(|do [=elems (&/map% #(|do [=analysis (&&/analyse-1+ analyse %)]
(return =analysis))
?elems)
_ (&type/check exo-type (&/V &/$TupleT (&/|map &&/expr-type* =elems)))
_cursor &/cursor]
(return (&/|list (&&/|meta exo-type _cursor
(&/V &&/$tuple =elems)
))))
(|do [exo-type* (&type/actual-type exo-type)]
(|case exo-type*
(&/$TupleT ?members)
(|do [=elems (&/map2% (fn [elem-t elem]
(&&/analyse-1 analyse elem-t elem))
?members ?elems)
_cursor &/cursor]
(return (&/|list (&&/|meta exo-type _cursor
(&/V &&/$tuple =elems)
))))
(&/$UnivQ _)
(|do [$var &type/existential
exo-type** (&type/apply-type exo-type* $var)
[[tuple-type tuple-cursor] tuple-analysis] (&&/cap-1 (analyse-tuple analyse (&/V &/$Right exo-type**) ?elems))]
(return (&/|list (&&/|meta exo-type tuple-cursor
tuple-analysis))))
_
(fail (str "[Analyser Error] Tuples require tuple-types: " (&type/show-type exo-type*) " " (&type/show-type exo-type) " " "[" (->> ?elems (&/|map &/show-ast) (&/|interpose " ") (&/fold str "")) "]"))
;; (assert false (str "[Analyser Error] Tuples require tuple-types: " (&type/show-type exo-type*) " " (&type/show-type exo-type) " " "[" (->> ?elems (&/|map &/show-ast) (&/|interpose " ") (&/fold str "")) "]"))
))))))
(defn with-attempt [m-value on-error]
(fn [state]
(|case (m-value state)
(&/$Left msg)
((on-error msg) state)
output
output)))
(defn ^:private analyse-variant-body [analyse exo-type ?values]
(|do [output (with-attempt
(|case ?values
(&/$Nil)
(analyse-tuple analyse (&/V &/$Right exo-type) &/Nil$)
(&/$Cons ?value (&/$Nil))
(analyse exo-type ?value)
_
(analyse-tuple analyse (&/V &/$Right exo-type) ?values))
(fn [err]
(fail (str err "\n"
'analyse-variant-body " " (&type/show-type exo-type)
" " (->> ?values (&/|map &/show-ast) (&/|interpose " ") (&/fold str ""))))
;; (assert false
;; (str err "\n"
;; 'analyse-variant-body " " (&type/show-type exo-type)
;; " " (->> ?values (&/|map &/show-ast) (&/|interpose " ") (&/fold str ""))))
))]
(|case output
(&/$Cons x (&/$Nil))
(return x)
_
(fail "[Analyser Error] Can't expand to other than 1 element."))))
(defn analyse-variant [analyse ?exo-type idx ?values]
(|case ?exo-type
(&/$Left exo-type)
(|do [;; :let [_ (println 'analyse-variant/Left 0 (&type/show-type exo-type))]
exo-type* (&type/actual-type exo-type)
;; :let [_ (println 'analyse-variant/Left 1 (&type/show-type exo-type*))]
]
(|case exo-type*
(&/$UnivQ _)
(&type/with-var
(fn [$var]
(|do [exo-type** (&type/apply-type exo-type* $var)
;; :let [_ (println 'analyse-variant/Left 2 (&type/show-type exo-type**))]
[[variant-type variant-cursor] variant-analysis] (&&/cap-1 (analyse-variant analyse (&/V &/$Left exo-type**) idx ?values))
;; :let [_ (println 'analyse-variant/Left 3 (&type/show-type variant-type))]
=var (&type/resolve-type $var)
;; :let [_ (println 'analyse-variant/Left 4 (&type/show-type =var))]
inferred-type (|case =var
(&/$VarT iid)
(|do [:let [=var* (next-bound-type variant-type)]
_ (&type/set-var iid =var*)
variant-type* (&type/clean $var variant-type)]
(return (&type/Univ$ &/Nil$ variant-type*)))
_
(&type/clean $var variant-type))
;; :let [_ (println 'analyse-variant/Left 5 (&type/show-type inferred-type))]
]
(return (&/|list (&&/|meta inferred-type variant-cursor
variant-analysis))))))
_
(analyse-variant analyse (&/V &/$Right exo-type*) idx ?values)))
(&/$Right exo-type)
;; [_ exo-type]
(|do [;; :let [_ (println 'analyse-variant/Right 0 (&type/show-type exo-type))]
exo-type* (|case exo-type
(&/$VarT ?id)
(&/try-all% (&/|list (|do [exo-type* (&type/deref ?id)]
(&type/actual-type exo-type*))
(|do [_ (&type/set-var ?id &type/Type)]
(&type/actual-type &type/Type))))
_
(&type/actual-type exo-type))]
(|case exo-type*
(&/$VariantT ?cases)
(|case (&/|at idx ?cases)
(&/$Some vtype)
(|do [=value (with-attempt
(analyse-variant-body analyse vtype ?values)
(fn [err]
(|do [_exo-type (&type/deref+ exo-type)]
(fail (str err "\n"
'analyse-variant " " idx " " (&type/show-type exo-type) " " (&type/show-type _exo-type)
" " (->> ?values (&/|map &/show-ast) (&/|interpose " ") (&/fold str "")))))))
_cursor &/cursor]
(return (&/|list (&&/|meta exo-type _cursor
(&/V &&/$variant (&/T idx =value))
))))
(&/$None)
(fail (str "[Analyser Error] There is no case " idx " for variant type " (&type/show-type exo-type*))))
(&/$UnivQ _)
(|do [$var &type/existential
exo-type** (&type/apply-type exo-type* $var)]
(analyse-variant analyse (&/V &/$Right exo-type**) idx ?values))
_
(fail (str "[Analyser Error] Can't create a variant if the expected type is " (&type/show-type exo-type*)))))))
(defn analyse-record [analyse exo-type ?elems]
(|do [[rec-members rec-type] (&&record/order-record ?elems)]
(|case exo-type
(&/$VarT id)
(|do [? (&type/bound? id)]
(if ?
(analyse-tuple analyse (&/V &/$Right exo-type) rec-members)
(|do [[[tuple-type tuple-cursor] tuple-analysis] (&&/cap-1 (analyse-tuple analyse (&/V &/$Left rec-type) rec-members))
_ (&type/check exo-type tuple-type)]
(return (&/|list (&&/|meta exo-type tuple-cursor
tuple-analysis))))))
_
(analyse-tuple analyse (&/V &/$Right exo-type) rec-members)
)))
(defn ^:private analyse-global [analyse exo-type module name]
(|do [[[r-module r-name] $def] (&&module/find-def module name)
;; :let [_ (prn 'analyse-symbol/_1.1 r-module r-name)]
;; :let [_ (prn 'analyse-global/$def (aget $def 0))]
endo-type (|case $def
(&/$ValueD ?type _)
(return ?type)
(&/$MacroD _)
(return &type/Macro)
(&/$TypeD _)
(return &type/Type))
_ (if (and (clojure.lang.Util/identical &type/Type endo-type)
(clojure.lang.Util/identical &type/Type exo-type))
(return nil)
(&type/check exo-type endo-type))
_cursor &/cursor]
(return (&/|list (&&/|meta endo-type _cursor
(&/V &&/$var (&/V &/$Global (&/T r-module r-name)))
)))))
(defn ^:private analyse-local [analyse exo-type name]
(fn [state]
(|let [stack (&/get$ &/$envs state)
no-binding? #(and (->> % (&/get$ &/$locals) (&/get$ &/$mappings) (&/|contains? name) not)
(->> % (&/get$ &/$closure) (&/get$ &/$mappings) (&/|contains? name) not))
[inner outer] (&/|split-with no-binding? stack)]
(|case outer
(&/$Nil)
(&/run-state (|do [module-name &/get-module-name]
(analyse-global analyse exo-type module-name name))
state)
(&/$Cons ?genv (&/$Nil))
(do ;; (prn 'analyse-symbol/_2 ?module name name (->> ?genv (&/get$ &/$locals) (&/get$ &/$mappings) &/|keys &/->seq))
(if-let [global (->> ?genv (&/get$ &/$locals) (&/get$ &/$mappings) (&/|get name))]
(do ;; (prn 'analyse-symbol/_2.1 ?module name name (aget global 0))
(|case global
[(&/$Global ?module* name*) _]
((|do [[[r-module r-name] $def] (&&module/find-def ?module* name*)
;; :let [_ (prn 'analyse-symbol/_2.1.1 r-module r-name)]
endo-type (|case $def
(&/$ValueD ?type _)
(return ?type)
(&/$MacroD _)
(return &type/Macro)
(&/$TypeD _)
(return &type/Type))
_ (if (and (clojure.lang.Util/identical &type/Type endo-type)
(clojure.lang.Util/identical &type/Type exo-type))
(return nil)
(&type/check exo-type endo-type))
_cursor &/cursor]
(return (&/|list (&&/|meta endo-type _cursor
(&/V &&/$var (&/V &/$Global (&/T r-module r-name)))
))))
state)
_
(fail* "[Analyser Error] Can't have anything other than a global def in the global environment.")))
(fail* "")))
(&/$Cons top-outer _)
(do ;; (prn 'analyse-symbol/_3 ?module name)
(|let [scopes (&/|tail (&/folds #(&/Cons$ (&/get$ &/$name %2) %1)
(&/|map #(&/get$ &/$name %) outer)
(&/|reverse inner)))
[=local inner*] (&/fold2 (fn [register+new-inner frame in-scope]
(|let [[register new-inner] register+new-inner
[register* frame*] (&&lambda/close-over (&/|reverse in-scope) name register frame)]
(&/T register* (&/Cons$ frame* new-inner))))
(&/T (or (->> top-outer (&/get$ &/$locals) (&/get$ &/$mappings) (&/|get name))
(->> top-outer (&/get$ &/$closure) (&/get$ &/$mappings) (&/|get name)))
&/Nil$)
(&/|reverse inner) scopes)]
((|do [_ (&type/check exo-type (&&/expr-type* =local))]
(return (&/|list =local)))
(&/set$ &/$envs (&/|++ inner* outer) state))))
))))
(defn analyse-symbol [analyse exo-type ident]
(|do [:let [[?module ?name] ident]]
(if (= "" ?module)
(analyse-local analyse exo-type ?name)
(analyse-global analyse exo-type ?module ?name))
))
(defn ^:private analyse-apply* [analyse exo-type fun-type ?args]
;; (prn 'analyse-apply* (aget fun-type 0))
(|case ?args
(&/$Nil)
(|do [;; :let [_ (prn 'analyse-apply*/_0 (&type/show-type exo-type) (&type/show-type fun-type))]
_ (&type/check exo-type fun-type)
;; :let [_ (prn 'analyse-apply*/_1 'SUCCESS (str "(_ " (->> ?args (&/|map &/show-ast) (&/|interpose " ") (&/fold str "")) ")"))]
]
(return (&/T fun-type &/Nil$)))
(&/$Cons ?arg ?args*)
(|do [?fun-type* (&type/actual-type fun-type)]
(|case ?fun-type*
(&/$UnivQ _)
;; (|do [$var &type/existential
;; type* (&type/apply-type ?fun-type* $var)]
;; (analyse-apply* analyse exo-type type* ?args))
(&type/with-var
(fn [$var]
(|do [type* (&type/apply-type ?fun-type* $var)
[=output-t =args] (analyse-apply* analyse exo-type type* ?args)]
(|case $var
(&/$VarT ?id)
(|do [? (&type/bound? ?id)
type** (if ?
(&type/clean $var =output-t)
(|do [_ (&type/set-var ?id (&/V &/$BoundT 1))]
(&type/clean $var =output-t)))]
(return (&/T type** =args)))
))))
(&/$LambdaT ?input-t ?output-t)
(|do [[=output-t =args] (analyse-apply* analyse exo-type ?output-t ?args*)
=arg (with-attempt
(&&/analyse-1 analyse ?input-t ?arg)
(fn [err]
(fail (str err "\n"
'analyse-apply* " " (&type/show-type exo-type) " " (&type/show-type ?fun-type*)
" " "(_ " (->> ?args (&/|map &/show-ast) (&/|interpose " ") (&/fold str "")) ")"))))]
(return (&/T =output-t (&/Cons$ =arg =args))))
;; [[&/$VarT ?id-t]]
;; (|do [ (&type/deref ?id-t)])
_
(fail (str "[Analyser Error] Can't apply a non-function: " (&type/show-type ?fun-type*)))))
))
(defn analyse-apply [analyse exo-type form-cursor =fn ?args]
(|do [loader &/loader]
(|let [[[=fn-type =fn-cursor] =fn-form] =fn]
(|case =fn-form
(&&/$var (&/$Global ?module ?name))
(|do [[real-name $def] (&&module/find-def ?module ?name)]
(|case $def
(&/$MacroD macro)
(|do [;; :let [_ (prn 'MACRO-EXPAND|PRE (&/ident->text real-name))]
macro-expansion #(-> macro (.apply ?args) (.apply %))
;; :let [_ (prn 'MACRO-EXPAND|POST (&/ident->text real-name))]
;; :let [_ (when (or (= "do" (aget real-name 1))
;; ;; (= "..?" (aget real-name 1))
;; ;; (= "try$" (aget real-name 1))
;; )
;; (->> (&/|map &/show-ast macro-expansion)
;; (&/|interpose "\n")
;; (&/fold str "")
;; (prn (&/ident->text real-name))))]
]
(&/flat-map% (partial analyse exo-type) macro-expansion))
_
(|do [[=output-t =args] (analyse-apply* analyse exo-type =fn-type ?args)]
(return (&/|list (&&/|meta =output-t =fn-cursor
(&/V &&/$apply (&/T =fn =args))
))))))
_
(|do [[=output-t =args] (analyse-apply* analyse exo-type =fn-type ?args)]
(return (&/|list (&&/|meta =output-t =fn-cursor
(&/V &&/$apply (&/T =fn =args))
)))))
)))
(defn analyse-case [analyse exo-type ?value ?branches]
(|do [:let [num-branches (&/|length ?branches)]
_ (&/assert! (> num-branches 0) "[Analyser Error] Can't have empty branches in \"case'\" expression.")
_ (&/assert! (even? num-branches) "[Analyser Error] Unbalanced branches in \"case'\" expression.")
=value (&&/analyse-1+ analyse ?value)
=match (&&case/analyse-branches analyse exo-type (&&/expr-type* =value) (&/|as-pairs ?branches))
_cursor &/cursor]
(return (&/|list (&&/|meta exo-type _cursor
(&/V &&/$case (&/T =value =match))
)))))
(defn analyse-lambda* [analyse exo-type ?self ?arg ?body]
(|case exo-type
(&/$VarT id)
(|do [? (&type/bound? id)]
(if ?
(|do [exo-type* (&type/deref id)]
(analyse-lambda* analyse exo-type* ?self ?arg ?body))
;; Inference
(&type/with-var
(fn [$input]
(&type/with-var
(fn [$output]
(|do [[[lambda-type lambda-cursor] lambda-analysis] (analyse-lambda* analyse (&type/Lambda$ $input $output) ?self ?arg ?body)
=input (&type/resolve-type $input)
=output (&type/resolve-type $output)
inferred-type (|case =input
(&/$VarT iid)
(|do [:let [=input* (next-bound-type =output)]
_ (&type/set-var iid =input*)
=output* (&type/clean $input =output)
=output** (&type/clean $output =output*)]
(return (&type/Univ$ &/Nil$ (embed-inferred-input =input* =output**))))
_
(|do [=output* (&type/clean $input =output)
=output** (&type/clean $output =output*)]
(return (embed-inferred-input =input =output**))))
_ (&type/check exo-type inferred-type)]
(return (&&/|meta inferred-type lambda-cursor
lambda-analysis)))
))))))
_
(|do [exo-type* (&type/actual-type exo-type)]
(|case exo-type
(&/$UnivQ _)
(|do [$var &type/existential
exo-type** (&type/apply-type exo-type* $var)]
(analyse-lambda* analyse exo-type** ?self ?arg ?body))
(&/$LambdaT ?arg-t ?return-t)
(|do [[=scope =captured =body] (&&lambda/with-lambda ?self exo-type*
?arg ?arg-t
(&&/analyse-1 analyse ?return-t ?body))
_cursor &/cursor]
(return (&&/|meta exo-type* _cursor
(&/V &&/$lambda (&/T =scope =captured =body)))))
_
(fail (str "[Analyser Error] Functions require function types: "
(&type/show-type exo-type*)))))
))
(defn analyse-lambda** [analyse exo-type ?self ?arg ?body]
(|case exo-type
(&/$UnivQ _)
(|do [$var &type/existential
exo-type* (&type/apply-type exo-type $var)
[_ _expr] (analyse-lambda** analyse exo-type* ?self ?arg ?body)
_cursor &/cursor]
(return (&&/|meta exo-type _cursor _expr)))
(&/$VarT id)
(|do [? (&type/bound? id)]
(if ?
(|do [exo-type* (&type/actual-type exo-type)]
(analyse-lambda* analyse exo-type* ?self ?arg ?body))
;; Inference
(analyse-lambda* analyse exo-type ?self ?arg ?body)))
_
(|do [exo-type* (&type/actual-type exo-type)]
(analyse-lambda* analyse exo-type* ?self ?arg ?body))
))
(defn analyse-lambda [analyse exo-type ?self ?arg ?body]
(|do [output (analyse-lambda** analyse exo-type ?self ?arg ?body)]
(return (&/|list output))))
(defn analyse-def [analyse compile-token ?name ?value]
;; (prn 'analyse-def/BEGIN ?name)
;; (when (= "monoid$" ?name)
;; (reset! &type/!flag true))
(|do [module-name &/get-module-name
;; :let [_ (println 'DEF/PRE (str module-name ";" ?name))]
? (&&module/defined? module-name ?name)]
(if ?
(fail (str "[Analyser Error] Can't redefine " (str module-name ";" ?name)))
(|do [=value (&/with-scope ?name
(&&/analyse-1+ analyse ?value))]
(|case =value
[_ (&&/$var (&/$Global ?r-module ?r-name))]
(|do [_ (&&module/def-alias module-name ?name ?r-module ?r-name (&&/expr-type* =value))
;; :let [_ (println 'analyse-def/ALIAS (str module-name ";" ?name) '=> (str ?r-module ";" ?r-name))
;; _ (println)]
]
(return &/Nil$))
_
(do ;; (println 'DEF (str module-name ";" ?name))
(|do [_ (compile-token (&/V &&/$def (&/T ?name =value)))
;; _ (if (and (= "lux" module-name)
;; (= "Type" ?name))
;; (|do [newly-defined-Type
;; :let [_ (&type/redefine-type! newly-defined-Type)]]
;; (return nil))
;; (return nil))
:let [;; _ (println 'DEF/COMPILED (str module-name ";" ?name))
[[def-type def-cursor] def-analysis] =value
_ (println 'DEF (str module-name ";" ?name) ;; (&type/show-type def-type)
)]]
(return &/Nil$))))
))))
(defn analyse-declare-macro [analyse compile-token ?name]
(|do [;; :let [_ (prn 'analyse-declare-macro ?name "0")]
module-name &/get-module-name
;; :let [_ (prn 'analyse-declare-macro ?name "1")]
_ (compile-token (&/V &&/$declare-macro (&/T module-name ?name)))
;; :let [_ (prn 'analyse-declare-macro ?name "2")]
]
(return &/Nil$)))
(defn analyse-declare-tags [tags type-name]
(|do [module-name &/get-module-name
;; :let [_ (prn 'analyse-declare-tags (&/ident->text (&/T module-name type-name)) (&/->seq tags))]
[_ def-data] (&&module/find-def module-name type-name)
;; :let [_ (prn 'analyse-declare-tags (&/ident->text (&/T module-name type-name)) (&/->seq tags) (&/adt->text def-data))]
def-type (&&module/ensure-type-def def-data)
_ (&&module/declare-tags module-name tags def-type)]
(return &/Nil$)))
(defn analyse-import [analyse compile-module compile-token path]
;; (prn 'analyse-import path)
(|do [module-name &/get-module-name
_ (if (= module-name path)
(fail (str "[Analyser Error] Module can't import itself: " path))
(return nil))]
(&/save-module
(|do [already-compiled? (&&module/exists? path)
;; :let [_ (prn 'analyse-import module-name path already-compiled?)]
active? (&/active-module? path)
_ (&/assert! (not active?) (str "[Analyser Error] Can't import a module that is mid-compilation: " path " @ " module-name))
_ (&&module/add-import path)
_ (if (not already-compiled?)
(compile-module path)
(return nil))]
(return &/Nil$)))))
(defn analyse-export [analyse compile-token name]
(|do [module-name &/get-module-name
_ (&&module/export module-name name)]
(return &/Nil$)))
(defn analyse-alias [analyse compile-token ex-alias ex-module]
(|do [module-name &/get-module-name
_ (&&module/alias module-name ex-alias ex-module)]
(return &/Nil$)))
(defn analyse-check [analyse eval! exo-type ?type ?value]
(|do [=type (&&/analyse-1 analyse &type/Type ?type)
==type (eval! =type)
;; :let [_ (prn 'analyse-check/_0 (&type/show-type ==type))]
_ (&type/check exo-type ==type)
=value (&&/analyse-1 analyse ==type ?value)
;; :let [_ (prn 'analyse-check/_1 (&/adt->text =value))]
_cursor &/cursor
]
(return (&/|list (&&/|meta ==type _cursor
(&/V &&/$ann (&/T =value =type))
)))))
(defn analyse-coerce [analyse eval! exo-type ?type ?value]
(|do [=type (&&/analyse-1 analyse &type/Type ?type)
==type (eval! =type)
_ (&type/check exo-type ==type)
=value (&&/analyse-1+ analyse ?value)
_cursor &/cursor]
(return (&/|list (&&/|meta ==type _cursor
(&/V &&/$ann (&/T =value =type))
)))))
|