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(.module:
[lux (#- loop)
[abstract
["." monad (#+ do)]]
[control
["p" parser]]
[data
["." maybe ("#;." monad)]
[number
["n" nat]]
[collection
["." list ("#;." functor)]]]
[macro
["." code]
["." syntax]]]
["." /// #_
## TODO: Remove the 'extension' import ASAP.
["#." extension]
["#/" //
["#." reference (#+ Register Variable)]
["#." analysis (#+ Environment)]
["/" synthesis (#+ Path Abstraction Synthesis)]]])
(type: #export (Transform a)
(-> a (Maybe a)))
(def: (some? maybe)
(All [a] (-> (Maybe a) Bit))
(case maybe
(#.Some _) #1
#.None #0))
(template: #export (self)
(#/.Reference (////reference.local 0)))
(template: (recursive-apply args)
(#/.Apply (self) args))
(def: improper #0)
(def: proper #1)
(def: (proper? exprS)
(-> Synthesis Bit)
(case exprS
(^ (self))
improper
(#/.Structure structure)
(case structure
(#////analysis.Variant variantS)
(proper? (get@ #////analysis.value variantS))
(#////analysis.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
[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
(#////analysis.Variant variantS)
(do maybe.monad
[valueS' (|> variantS (get@ #////analysis.value) recur)]
(wrap (|> variantS
(set@ #////analysis.value valueS')
#////analysis.Variant
#/.Structure)))
(#////analysis.Tuple membersS+)
(|> membersS+
(monad.map maybe.monad recur)
(maybe;map (|>> #////analysis.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
[inputS' (recur inputS)
pathS' (adjust-path recur offset pathS)]
(wrap (|> pathS' [inputS'] /.branch/case)))
(^ (/.branch/let [inputS register bodyS]))
(do maybe.monad
[inputS' (recur inputS)
bodyS' (recur bodyS)]
(wrap (/.branch/let [inputS' register bodyS'])))
(^ (/.branch/if [inputS thenS elseS]))
(do maybe.monad
[inputS' (recur inputS)
thenS' (recur thenS)
elseS' (recur elseS)]
(wrap (/.branch/if [inputS' thenS' elseS'])))
(^ (/.loop/scope scopeS))
(do maybe.monad
[inits' (|> scopeS
(get@ #/.inits)
(monad.map maybe.monad 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 recur)
(maybe;map (|>> /.loop/recur)))
(^ (/.function/abstraction [environment arity bodyS]))
(do maybe.monad
[environment' (monad.map maybe.monad
(resolve scope-environment)
environment)]
(wrap (/.function/abstraction [environment' arity bodyS])))
(^ (/.function/apply [function arguments]))
(do maybe.monad
[function' (recur function)
arguments' (monad.map maybe.monad recur arguments)]
(wrap (/.function/apply [function' arguments'])))
(#/.Extension [name argsS])
(|> argsS
(monad.map maybe.monad 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)))
|
