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|
(.module:
lux
(lux (control ["p" parser])
(data [maybe]
["e" error]
[number]
[product]
text/format
(coll [list "list/" Functor<List> Fold<List> Monoid<List>]
[dict #+ Dict]))
(macro [code]
["s" syntax]))
(luxc (lang ["la" analysis]
["ls" synthesis]
[".L" extension #+ Syntheses]
(synthesis [".S" case]
[".S" function]
[".S" loop])
[".L" variable #+ Variable])
))
(def: init-env (List Variable) (list))
(def: init-resolver (Dict Int Int) (dict.new number.Hash<Int>))
(def: (prepare-body inner-arity arity body)
(-> ls.Arity ls.Arity ls.Synthesis ls.Synthesis)
(if (functionS.nested? inner-arity)
body
(loopS.reify-recursion arity body)))
(def: (let$ register inputS bodyS)
(-> Nat ls.Synthesis ls.Synthesis ls.Synthesis)
(` ("lux let" (~ (code.nat register)) (~ inputS) (~ bodyS))))
(def: (if$ testS thenS elseS)
(-> ls.Synthesis ls.Synthesis ls.Synthesis ls.Synthesis)
(` ("lux if" (~ testS)
(~ thenS)
(~ elseS))))
(def: (function$ arity environment body)
(-> ls.Arity (List Variable) ls.Synthesis ls.Synthesis)
(` ("lux function" (~ (code.nat arity))
[(~+ (list/map code.int environment))]
(~ body))))
(def: (variant$ tag last? valueS)
(-> Nat Bool ls.Synthesis ls.Synthesis)
(` ((~ (code.nat tag)) (~ (code.bool last?)) (~ valueS))))
(def: (var$ var)
(-> Variable ls.Synthesis)
(` ((~ (code.int var)))))
(def: (procedure$ name argsS)
(-> Text (List ls.Synthesis) ls.Synthesis)
(` ((~ (code.text name)) (~+ argsS))))
(def: (call$ funcS argsS)
(-> ls.Synthesis (List ls.Synthesis) ls.Synthesis)
(` ("lux call" (~ funcS) (~+ argsS))))
(def: (synthesize-case arity num-locals synthesize inputA branchesA)
(-> ls.Arity Nat (-> Nat la.Analysis ls.Synthesis)
la.Analysis (List [la.Pattern la.Analysis])
ls.Synthesis)
(let [inputS (synthesize num-locals inputA)]
(case (list.reverse branchesA)
(^multi (^ (list [(^code ("lux case bind" (~ [_ (#.Nat input-register)])))
(^code ((~ [_ (#.Int var)])))]))
(not (variableL.captured? var))
(n/= input-register (variableL.local-register var)))
inputS
(^ (list [(^code ("lux case bind" (~ [_ (#.Nat register)]))) bodyA]))
(let$ (if (functionS.nested? arity)
(n/+ (n/dec arity) register)
register)
inputS
(synthesize (n/inc num-locals) bodyA))
(^or (^ (list [(^code true) thenA] [(^code false) elseA]))
(^ (list [(^code false) elseA] [(^code true) thenA])))
(if$ inputS (synthesize num-locals thenA) (synthesize num-locals elseA))
(#.Cons [lastP lastA] prevsPA)
(let [transform-branch (: (-> la.Pattern la.Analysis ls.Path)
(caseS.path arity num-locals synthesize))
pathS (list/fold caseS.weave
(transform-branch lastP lastA)
(list/map (product.uncurry transform-branch) prevsPA))]
(` ("lux case" (~ inputS) (~ pathS))))
_
(undefined)
)))
(def: (synthesize-apply synthesize num-locals exprA)
(-> (-> la.Analysis ls.Synthesis) Nat la.Analysis ls.Synthesis)
(let [[funcA argsA] (functionS.unfold-apply exprA)
funcS (synthesize funcA)
argsS (list/map synthesize argsA)]
(case funcS
(^multi (^code ("lux function" (~ [_ (#.Nat _arity)]) [(~+ _env)] (~ _bodyS)))
(and (n/= _arity (list.size argsS))
(not (loopS.contains-self-reference? _bodyS)))
[(s.run _env (p.some s.int)) (#e.Success _env)])
(` ("lux loop" (~ (code.nat (n/inc num-locals))) [(~+ argsS)]
(~ (loopS.adjust _env num-locals _bodyS))))
(^code ("lux call" (~ funcS') (~+ argsS')))
(call$ funcS' (list/compose argsS' argsS))
_
(call$ funcS argsS))))
(def: #export (synthesize extensions expressionA)
(-> Syntheses la.Analysis ls.Synthesis)
(loop [arity +0
resolver init-resolver
direct? false
num-locals +0
expressionA expressionA]
(case expressionA
(^code [(~ _left) (~ _right)])
(` [(~+ (list/map (recur arity resolver false num-locals)
(la.unfold-tuple expressionA)))])
(^or (^code ("lux sum left" (~ _)))
(^code ("lux sum right" (~ _))))
(let [[tag last? value] (maybe.assume (la.unfold-variant expressionA))]
(variant$ tag last? (recur arity resolver false num-locals value)))
(^code ((~ [_ (#.Int var)])))
(if (variableL.local? var)
(if (functionS.nested? arity)
(if (variableL.self? var)
(call$ (var$ 0) (|> (list.n/range +1 (n/dec arity))
(list/map (|>> variableL.local code.int (~) () (`)))))
(var$ (functionS.adjust-var arity var)))
(var$ var))
(var$ (maybe.default var (dict.get var resolver))))
(^code ("lux case" (~ inputA) (~ [_ (#.Record branchesA)])))
(synthesize-case arity num-locals (recur arity resolver false) inputA branchesA)
(^multi (^code ("lux function" [(~+ scope)] (~ bodyA)))
[(s.run scope (p.some s.int)) (#e.Success raw-env)])
(let [function-arity (if direct?
(n/inc arity)
+1)
env (list/map (function [closure]
(case (dict.get closure resolver)
(#.Some resolved)
(if (and (variableL.local? resolved)
(functionS.nested? arity)
(|> resolved variableL.local-register (n/>= arity)))
(functionS.adjust-var arity resolved)
resolved)
#.None
(if (and (variableL.local? closure)
(functionS.nested? arity))
(functionS.adjust-var arity closure)
closure)))
raw-env)
env-vars (: (List Variable)
(case raw-env
#.Nil (list)
_ (|> (list.size raw-env) n/dec (list.n/range +0) (list/map variableL.captured))))
resolver' (if (and (functionS.nested? function-arity)
direct?)
(list/fold (function [[from to] resolver']
(dict.put from to resolver'))
init-resolver
(list.zip2 env-vars env))
(list/fold (function [var resolver']
(dict.put var var resolver'))
init-resolver
env-vars))]
(case (recur function-arity resolver' true function-arity bodyA)
(^ [_ (#.Form (list [_ (#.Text "lux function")] [_ (#.Nat unmerged-arity)] env' bodyS'))])
(let [merged-arity (n/inc unmerged-arity)]
(function$ merged-arity env
(prepare-body function-arity merged-arity bodyS')))
bodyS
(function$ +1 env (prepare-body function-arity +1 bodyS))))
(^code ("lux apply" (~+ _)))
(synthesize-apply (recur arity resolver false num-locals) num-locals expressionA)
(^code ((~ [_ (#.Text name)]) (~+ args)))
(case (dict.get name extensions)
#.None
(procedure$ name (list/map (recur arity resolver false num-locals) args))
(#.Some extension)
(extension (recur arity resolver false num-locals) args))
_
expressionA)))
|
