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|
(.module:
[lux #- function]
(lux (control [monad #+ do]
[state]
pipe
["ex" exception #+ exception:])
(data [maybe "maybe/" Monad<Maybe>]
[error]
(coll [list "list/" Functor<List> Monoid<List> Fold<List>]
(dictionary ["dict" unordered #+ Dict]))))
[///reference #+ Variable]
[///compiler #+ Operation]
[///analysis #+ Environment Arity Analysis]
[// #+ Synthesis Synthesizer]
[//loop])
(def: #export nested?
(-> Arity Bool)
(n/> +1))
(def: #export (adjust up-arity after? var)
(-> Arity Bool Variable Variable)
(case var
(#///reference.Local register)
(if (and after? (n/>= up-arity register))
(#///reference.Local (n/+ (dec up-arity) register))
var)
_
var))
(def: (unfold apply)
(-> Analysis [Analysis (List Analysis)])
(loop [apply apply
args (list)]
(case apply
(#///analysis.Apply arg func)
(recur func (#.Cons arg args))
_
[apply args])))
(def: #export (apply synthesize)
(-> Synthesizer Synthesizer)
(.function (_ exprA)
(let [[funcA argsA] (unfold exprA)]
(do (state.Monad<State'> error.Monad<Error>)
[funcS (synthesize funcA)
argsS (monad.map @ synthesize argsA)
locals //.locals]
(case funcS
(^ (//.function/abstraction functionS))
(wrap (|> functionS
(//loop.loop (get@ #//.environment functionS) locals argsS)
(maybe.default (//.function/apply [funcS argsS]))))
(^ (//.function/apply [funcS' argsS']))
(wrap (//.function/apply [funcS' (list/compose argsS' argsS)]))
_
(wrap (//.function/apply [funcS argsS])))))))
(def: (prepare up down)
(-> Arity Arity (//loop.Transform Synthesis))
(.function (_ body)
(if (nested? up)
(#.Some body)
(//loop.recursion down body))))
(exception: #export (cannot-prepare-function-body {_ []})
"")
(def: return
(All [a] (-> (Maybe a) (Operation //.State a)))
(|>> (case> (#.Some output)
(:: ///compiler.Monad<Operation> wrap output)
#.None
(///compiler.throw cannot-prepare-function-body []))))
(def: #export (function synthesize environment body)
(-> Synthesizer Environment Analysis (Operation //.State Synthesis))
(do ///compiler.Monad<Operation>
[direct? //.direct?
arity //.scope-arity
resolver //.resolver
#let [function-arity (if direct?
(inc arity)
+1)
up-environment (if (nested? arity)
(list/map (.function (_ closure)
(case (dict.get closure resolver)
(#.Some resolved)
(adjust arity true resolved)
#.None
(adjust arity false closure)))
environment)
environment)
down-environment (: (List Variable)
(case environment
#.Nil
(list)
_
(|> (list.size environment) dec (list.n/range +0)
(list/map (|>> #///reference.Foreign)))))
resolver' (if (and (nested? function-arity)
direct?)
(list/fold (.function (_ [from to] resolver')
(dict.put from to resolver'))
//.fresh-resolver
(list.zip2 down-environment up-environment))
(list/fold (.function (_ var resolver')
(dict.put var var resolver'))
//.fresh-resolver
down-environment))]
bodyS (//.with-abstraction function-arity resolver'
(synthesize body))]
(case bodyS
(^ (//.function/abstraction [env' down-arity' bodyS']))
(let [arity' (inc down-arity')]
(|> (prepare function-arity arity' bodyS')
(maybe/map (|>> [up-environment arity'] //.function/abstraction))
..return))
_
(|> (prepare function-arity +1 bodyS)
(maybe/map (|>> [up-environment +1] //.function/abstraction))
..return))))
|
