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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/.
(;module: lux
(lux (control ["F" functor]
applicative
monad)
(codata [io #- run])
(data (struct [list "List/" Monad<List>])
[number "Nat/" Codec<Text,Nat>]
text/format
error)
[compiler]
[macro]
(macro [ast]
["s" syntax #+ syntax: Syntax]
(syntax [common]))
[type]
(type ["tc" check])))
## [Type]
(type: #export (Eff F a)
(#Pure a)
(#Effect (F (Eff F a))))
(sig: #export (Handler E M)
(: (All [a] (-> (Eff E a) (M a)))
handle))
## [Values]
(struct: #export (Functor<Eff> dsl)
(All [F] (-> (F;Functor F) (F;Functor (Eff F))))
(def: (map f ea)
(case ea
(#Pure a)
(#Pure (f a))
(#Effect value)
(#Effect (:: dsl map (map f) value)))))
(struct: #export (Applicative<Eff> dsl)
(All [F] (-> (F;Functor F) (Applicative (Eff F))))
(def: functor (Functor<Eff> dsl))
(def: (wrap a)
(#Pure a))
(def: (apply ef ea)
(case [ef ea]
[(#Pure f) (#Pure a)]
(#Pure (f a))
[(#Pure f) (#Effect fa)]
(#Effect (:: dsl map
(:: (Functor<Eff> dsl) map f)
fa))
[(#Effect ff) _]
(#Effect (:: dsl map
(lambda [f] (apply f ea))
ff))
)))
(struct: #export (Monad<Eff> dsl)
(All [F] (-> (F;Functor F) (Monad (Eff F))))
(def: applicative (Applicative<Eff> dsl))
(def: (join efefa)
(case efefa
(#Pure efa)
(case efa
(#Pure a)
(#Pure a)
(#Effect fa)
(#Effect fa))
(#Effect fefa)
(#Effect (:: dsl map
(:: (Monad<Eff> dsl) join)
fefa))
)))
(type: (@| L R)
(All [a] (| (L a) (R a))))
(def: #export (combine-functors left right)
(All [L R]
(-> (F;Functor L) (F;Functor R)
(F;Functor (@| L R))))
(struct
(def: (map f l|r)
(case l|r
(+0 l) (+0 (:: left map f l))
(+1 r) (+1 (:: right map f r)))
)))
(def: #export (combine-handlers Monad<M> left right)
(All [L R M]
(-> (Monad M)
(Handler L M) (Handler R M)
(Handler (@| L R) M)))
(struct
(def: (handle el|r)
(case el|r
(#Pure x)
(:: Monad<M> wrap x)
(#Effect l|r)
(case l|r
(#;Left l) (:: left handle (#Effect l))
(#;Right r) (:: right handle (#Effect r))
))
)))
## [Syntax]
(syntax: #export (||E {effects (s;some s;any)})
(do @
[g!a (compiler;gensym "g!a")
#let [effects@a (List/map (lambda [eff] (` ((~ eff) (~ g!a))))
effects)]]
(wrap (list (` (All [(~ g!a)]
(| (~@ effects@a))))
))))
(syntax: #export (||F {functors (s;many s;any)})
(wrap (list (` ($_ ;;combine-functors (~@ functors))))))
(syntax: #export (||H monad {handlers (s;many s;any)})
(do @
[g!combiner (compiler;gensym "")]
(wrap (list (` (let [(~ g!combiner) (;;combine-handlers (~ monad))]
($_ (~ g!combiner) (~@ handlers))))))))
(type: Op
{#name Text
#inputs (List AST)
#output AST})
(def: op^
(Syntax Op)
(s;form (s;either ($_ s;seq
s;local-symbol
(s;tuple (s;some s;any))
s;any)
($_ s;seq
s;local-symbol
(:: s;Monad<Syntax> wrap (list))
s;any))))
(syntax: #export (effect: {exp-lvl common;export-level}
{name s;local-symbol}
{ops (s;many op^)})
(do @
[g!output (compiler;gensym "g!output")
#let [op-types (List/map (lambda [op]
(let [g!tag (ast;tag ["" (get@ #name op)])
g!inputs (` [(~@ (get@ #inputs op))])
g!output (` (-> (~ (get@ #output op)) (~ g!output)))]
(` ((~ g!tag) (~ g!inputs) (~ g!output)))))
ops)
type-name (ast;symbol ["" name])
type-def (` (type: (~@ (common;gen-export-level exp-lvl))
((~ type-name) (~ g!output))
(~@ op-types)))
op-tags (List/map (|>. (get@ #name) [""] ast;tag (list) ast;tuple)
ops)
functor-def (` (struct: (~@ (common;gen-export-level exp-lvl)) (~' _) (F;Functor (~ type-name))
(def: ((~' map) (~' f) (~' fa))
(case (~' fa)
(^template [(~' <tag>)]
((~' <tag>) (~' params) (~' cont))
((~' <tag>) (~' params) (. (~' f) (~' cont))))
((~@ op-tags))))
))
function-defs (List/map (lambda [op]
(let [g!name (ast;symbol ["" (get@ #name op)])
g!tag (ast;tag ["" (get@ #name op)])
g!params (: (List AST)
(case (list;size (get@ #inputs op))
+0 (list)
s (|> (list;n.range +0 (n.dec s))
(List/map (|>. Nat/encode
(format "_")
[""]
ast;symbol)))))]
(` (def: (~@ (common;gen-export-level exp-lvl)) ((~ g!name) (~@ g!params))
(-> (~@ (get@ #inputs op))
((~ type-name) (~ (get@ #output op))))
((~ g!tag) [(~@ g!params)] ;id)))))
ops)]]
(wrap (list& type-def
functor-def
function-defs))))
(type: Translation
{#effect Ident
#base AST
#monad AST})
(def: translation^
(Syntax Translation)
(s;form (do s;Monad<Syntax>
[_ (s;symbol! ["" "=>"])]
(s;seq s;symbol
(s;tuple (s;seq s;any
s;any))))))
(syntax: #export (handler: {exp-lvl common;export-level}
{name s;local-symbol}
{[effect base monad] translation^}
{defs (s;many (common;def *compiler*))})
(do @
[(^@ effect [e-module _]) (compiler;un-alias effect)
g!input (compiler;gensym "g!input")
g!cont (compiler;gensym "g!cont")
g!value (compiler;gensym "value")
#let [g!cases (|> defs
(List/map (lambda [def]
(let [g!tag (ast;tag [e-module (get@ #common;def-name def)])
g!args (List/map (|>. [""] ast;symbol)
(get@ #common;def-args def))
eff-calc (case (get@ #common;def-type def)
#;None
(get@ #common;def-value def)
(#;Some type)
(` (: (~ type) (~ (get@ #common;def-value def)))))
invocation (case g!args
#;Nil
eff-calc
_
(` ((~ eff-calc) (~@ g!args))))]
(list (` ((~ g!tag) [(~@ g!args)] (~ g!cont)))
(` (do (~ monad)
[(~ g!value) (~ invocation)]
((~' handle) ((~ g!cont) (~ g!value)))))
))))
List/join)]]
(wrap (list (` (struct: (~@ (common;gen-export-level exp-lvl)) (~ (ast;symbol ["" name]))
(;;Handler (~ (ast;symbol effect)) (~ base))
(def: ((~' handle) (~ g!input))
(case (~ g!input)
(#Pure (~ g!input))
(:: (~ monad) (~' wrap) (~ g!input))
(#Effect (~ g!input))
(case (~ g!input)
(~@ g!cases))))))))))
(syntax: #export (with-handler handler body)
(wrap (list (` (:: (~ handler) (~' handle) (~ body))))))
(def: (un-apply type-app)
(-> Type Type)
(case type-app
(#;AppT effect value)
effect
_
(error! (format "Wrong type format: " (%type type-app)))))
(def: (clean-effect effect)
(-> Type Type)
(case effect
(#;UnivQ env body)
(#;UnivQ (list) body)
_
(error! (format "Wrong effect format: " (%type effect)))))
(def: g!functor AST (ast;symbol ["" "%E"]))
(syntax: #export (doE functor {bindings (s;tuple (s;some s;any))} body)
(do @
[g!output (compiler;gensym "")]
(wrap (list (` (let [(~ g!functor) (~ functor)]
(do (Monad<Eff> (~ g!functor))
[(~@ bindings)
(~ g!output) (~ body)]
((~' wrap) (~ g!output)))))))))
(syntax: #export (lift {value (s;alt s;symbol
s;any)})
(case value
(#;Left var)
(do @
[input (compiler;find-type var)
output compiler;expected-type]
(case [input output]
(^=> [(#;AppT eff0 _) (#;AppT stackT0 recT0)]
{(type;apply-type stackT0 recT0) (#;Some unfoldT0)}
{stackT0 (^ (#;AppT (#;NamedT (ident-for ;;Eff) _)
stackT1))}
{(type;apply-type stackT1 recT0) (#;Some unfoldT1)}
{(list;find (lambda [[idx effect]]
(if (tc;checks? (clean-effect effect) eff0)
(#;Some idx)
#;None))
(|> unfoldT1 type;flatten-sum (List/map un-apply) list;enumerate))
(#;Some idx)})
(wrap (list (` (#;;Effect (:: (~ g!functor) (~' map) (~' wrap) ((~ (ast;int (nat-to-int idx)))
(~ (ast;symbol var))))))))
_
(compiler;fail (format "Invalid type to lift: " (%type output)))))
(#;Right node)
(do @
[g!value (compiler;gensym "")]
(wrap (list (` (let [(~ g!value) (~ node)]
(;;lift (~ g!value)))))))))
|
