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(.module:
[lux (#- loop)
[control
[monad (#+ do)]
["p" parser]]
[data
[maybe ("maybe/" Monad<Maybe>)]
[collection [list ("list/" Functor<List>)]]]
[macro
[code]
[syntax]]]
[// (#+ Path Abstraction Synthesis)
[///
[reference (#+ Register Variable)]
[compiler
[analysis (#+ Environment)]]]])
(type: #export (Transform a)
(-> a (Maybe a)))
(def: (some? maybe)
(All [a] (-> (Maybe a) Bool))
(case maybe
(#.Some _) true
#.None false))
(template: #export (self)
(#//.Reference (reference.local +0)))
(template: (recursive-apply args)
(#//.Apply (self) args))
(def: proper Bool true)
(def: improper Bool false)
(def: (proper? exprS)
(-> Synthesis Bool)
(case exprS
(^ (self))
improper
(#//.Structure structure)
(case structure
(#//.Variant variantS)
(proper? (get@ #analysis.value variantS))
(#//.Tuple membersS+)
(list.every? proper? membersS+))
(#//.Control controlS)
(case controlS
(#//.Branch branchS)
(case branchS
(#//.Case inputS pathS)
(and (proper? inputS)
(.loop [pathS pathS]
(case pathS
(^or (#//.Alt leftS rightS) (#//.Seq leftS rightS))
(and (recur leftS) (recur rightS))
(#//.Then bodyS)
(proper? bodyS)
_
proper)))
(#//.Let inputS register bodyS)
(and (proper? inputS)
(proper? bodyS))
(#//.If inputS thenS elseS)
(and (proper? inputS)
(proper? thenS)
(proper? elseS)))
(#//.Loop loopS)
(case loopS
(#//.Scope scopeS)
(and (list.every? proper? (get@ #//.inits scopeS))
(proper? (get@ #//.iteration scopeS)))
(#//.Recur argsS)
(list.every? proper? argsS))
(#//.Function functionS)
(case functionS
(#//.Abstraction environment arity bodyS)
(list.every? reference.self? environment)
(#//.Apply funcS argsS)
(and (proper? funcS)
(list.every? proper? argsS))))
(#//.Extension [name argsS])
(list.every? proper? argsS)
_
proper))
(def: (path-recursion synthesis-recursion)
(-> (Transform Synthesis) (Transform Path))
(function (recur pathS)
(case pathS
(#//.Alt leftS rightS)
(let [leftS' (recur leftS)
rightS' (recur rightS)]
(if (or (some? leftS')
(some? rightS'))
(#.Some (#//.Alt (maybe.default leftS leftS')
(maybe.default rightS rightS')))
#.None))
(#//.Seq leftS rightS)
(maybe/map (|>> (#//.Seq leftS)) (recur rightS))
(#//.Then bodyS)
(maybe/map (|>> #//.Then) (synthesis-recursion bodyS))
_
#.None)))
(def: #export (recursion arity)
(-> Nat (Transform Synthesis))
(function (recur exprS)
(case exprS
(#//.Control controlS)
(case controlS
(#//.Branch branchS)
(case branchS
(#//.Case inputS pathS)
(|> pathS
(path-recursion recur)
(maybe/map (|>> (#//.Case inputS) #//.Branch #//.Control)))
(#//.Let inputS register bodyS)
(maybe/map (|>> (#//.Let inputS register) #//.Branch #//.Control)
(recur bodyS))
(#//.If inputS thenS elseS)
(let [thenS' (recur thenS)
elseS' (recur elseS)]
(if (or (some? thenS')
(some? elseS'))
(#.Some (|> (#//.If inputS
(maybe.default thenS thenS')
(maybe.default elseS elseS'))
#//.Branch #//.Control))
#.None)))
(^ (#//.Function (recursive-apply argsS)))
(if (n/= arity (list.size argsS))
(#.Some (|> argsS #//.Recur #//.Loop #//.Control))
#.None)
_
#.None)
_
#.None)))
(def: (resolve environment)
(-> Environment (Transform Variable))
(function (_ variable)
(case variable
(#reference.Foreign register)
(list.nth register environment)
_
(#.Some variable))))
(def: (adjust-path adjust-synthesis offset)
(-> (Transform Synthesis) Register (Transform Path))
(function (recur pathS)
(case pathS
(#//.Bind register)
(#.Some (#//.Bind (n/+ offset register)))
(^template [<tag>]
(<tag> leftS rightS)
(do maybe.Monad<Maybe>
[leftS' (recur leftS)
rightS' (recur rightS)]
(wrap (<tag> leftS' rightS'))))
([#//.Alt] [#//.Seq])
(#//.Then bodyS)
(|> bodyS adjust-synthesis (maybe/map (|>> #//.Then)))
_
(#.Some pathS))))
(def: (adjust scope-environment offset)
(-> Environment Register (Transform Synthesis))
(function (recur exprS)
(case exprS
(#//.Structure structureS)
(case structureS
(#//.Variant variantS)
(do maybe.Monad<Maybe>
[valueS' (|> variantS (get@ #analysis.value) recur)]
(wrap (|> variantS
(set@ #analysis.value valueS')
#//.Variant
#//.Structure)))
(#//.Tuple membersS+)
(|> membersS+
(monad.map maybe.Monad<Maybe> recur)
(maybe/map (|>> #//.Tuple #//.Structure))))
(#//.Reference reference)
(case reference
(^ (reference.constant constant))
(#.Some exprS)
(^ (reference.local register))
(#.Some (#//.Reference (reference.local (n/+ offset register))))
(^ (reference.foreign register))
(|> scope-environment
(list.nth register)
(maybe/map (|>> #reference.Variable #//.Reference))))
(^ (//.branch/case [inputS pathS]))
(do maybe.Monad<Maybe>
[inputS' (recur inputS)
pathS' (adjust-path recur offset pathS)]
(wrap (|> pathS' [inputS'] //.branch/case)))
(^ (//.branch/let [inputS register bodyS]))
(do maybe.Monad<Maybe>
[inputS' (recur inputS)
bodyS' (recur bodyS)]
(wrap (//.branch/let [inputS' register bodyS'])))
(^ (//.branch/if [inputS thenS elseS]))
(do maybe.Monad<Maybe>
[inputS' (recur inputS)
thenS' (recur thenS)
elseS' (recur elseS)]
(wrap (//.branch/if [inputS' thenS' elseS'])))
(^ (//.loop/scope scopeS))
(do maybe.Monad<Maybe>
[inits' (|> scopeS
(get@ #//.inits)
(monad.map maybe.Monad<Maybe> recur))
iteration' (recur (get@ #//.iteration scopeS))]
(wrap (//.loop/scope {#//.start (|> scopeS (get@ #//.start) (n/+ offset))
#//.inits inits'
#//.iteration iteration'})))
(^ (//.loop/recur argsS))
(|> argsS
(monad.map maybe.Monad<Maybe> recur)
(maybe/map (|>> //.loop/recur)))
(^ (//.function/abstraction [environment arity bodyS]))
(do maybe.Monad<Maybe>
[environment' (monad.map maybe.Monad<Maybe>
(resolve scope-environment)
environment)]
(wrap (//.function/abstraction [environment' arity bodyS])))
(^ (//.function/apply [function arguments]))
(do maybe.Monad<Maybe>
[function' (recur function)
arguments' (monad.map maybe.Monad<Maybe> recur arguments)]
(wrap (//.function/apply [function' arguments'])))
(#//.Extension [name argsS])
(|> argsS
(monad.map maybe.Monad<Maybe> recur)
(maybe/map (|>> [name] #//.Extension)))
_
(#.Some exprS))))
(def: #export (loop environment num-locals inits functionS)
(-> Environment Nat (List Synthesis) Abstraction (Maybe Synthesis))
(let [bodyS (get@ #//.body functionS)]
(if (and (n/= (list.size inits)
(get@ #//.arity functionS))
(proper? bodyS))
(|> bodyS
(adjust environment num-locals)
(maybe/map (|>> [(inc num-locals) inits] //.loop/scope)))
#.None)))
|
