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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]))
(meta [code]
["s" syntax]))
(luxc ["&" base]
(lang ["la" analysis]
["ls" synthesis])
(synthesizer ["&&;" structure]
["&&;" case]
["&&;" function]
["&&;" loop])
))
(def: init-env (List ls;Variable) (list))
(def: init-resolver (Dict Int Int) (dict;new number;Hash<Int>))
(def: (prepare-body inner-arity arity body)
(-> Nat Nat ls;Synthesis ls;Synthesis)
(if (&&function;nested? inner-arity)
body
(&&loop;reify-recursion arity body)))
(def: (parse-environment env)
(-> (List Code) (e;Error (List ls;Variable)))
(s;run env (p;some s;int)))
(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 ls;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)
(-> ls;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 synthesize inputA branchesA)
(-> (-> la;Analysis ls;Synthesis)
la;Analysis (List [la;Pattern la;Analysis])
ls;Synthesis)
(let [inputS (synthesize inputA)]
(case (list;reverse branchesA)
(^multi (^ (list [(#la;BindP input-register)
(#la;Variable (#;Local output-register))]))
(n.= input-register output-register))
inputS
(^ (list [(#la;BindP register) bodyA]))
(let$ register inputS (synthesize bodyA))
(^or (^ (list [(#la;BoolP true) thenA] [(#la;BoolP false) elseA]))
(^ (list [(#la;BoolP false) elseA] [(#la;BoolP true) thenA])))
(if$ inputS (synthesize thenA) (synthesize elseA))
(#;Cons [lastP lastA] prevsPA)
(let [transform-branch (: (-> la;Pattern la;Analysis ls;Path)
(function [pattern expr]
(|> (synthesize expr)
(~) ("lux case exec")
("lux case seq" (~ (&&case;path pattern)))
(`))))]
(` ("lux case" (~ inputS)
(~ (list/fold &&case;weave
(transform-branch lastP lastA)
(list/map (product;uncurry transform-branch) prevsPA))))))
_
(undefined)
)))
(def: #export (synthesize analysis)
(-> la;Analysis ls;Synthesis)
(loop [outer-arity +0
resolver init-resolver
num-locals +0
exprA analysis]
(case exprA
#la;Unit
(' [])
(^template [<from> <to>]
(<from> value)
(<to> value))
([#la;Bool code;bool]
[#la;Nat code;nat]
[#la;Int code;int]
[#la;Deg code;deg]
[#la;Frac code;frac]
[#la;Text code;text]
[#la;Definition code;symbol])
(#la;Product _)
(` [(~@ (list/map (recur +0 resolver num-locals) (&&structure;unfold-tuple exprA)))])
(#la;Sum choice)
(let [[tag last? value] (&&structure;unfold-variant choice)]
(variant$ tag last? (recur +0 resolver num-locals value)))
(#la;Variable ref)
(case ref
(#;Local register)
(if (&&function;nested? outer-arity)
(if (n.= +0 register)
(call$ (var$ 0) (|> (list;n.range +1 (n.dec outer-arity))
(list/map (|>. &&function;to-local code;int (~) () (`)))))
(var$ (&&function;adjust-var outer-arity (&&function;to-local register))))
(var$ (&&function;to-local register)))
(#;Captured register)
(var$ (let [var (&&function;to-captured register)]
(maybe;default var (dict;get var resolver)))))
(#la;Case inputA branchesA)
(synthesize-case (recur +0 resolver num-locals) inputA branchesA)
(#la;Function scope bodyA)
(let [inner-arity (n.inc outer-arity)
raw-env (&&function;environment scope)
env (list/map (function [var] (maybe;default var (dict;get var resolver))) raw-env)
env-vars (let [env-size (list;size raw-env)]
(: (List ls;Variable)
(case env-size
+0 (list)
_ (list/map &&function;to-captured (list;n.range +0 (n.dec env-size))))))
resolver' (if (&&function;nested? inner-arity)
(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 inner-arity resolver' +0 bodyA)
(^ [_ (#;Form (list [_ (#;Text "lux function")] [_ (#;Nat arity')] env' bodyS'))])
(let [arity (n.inc arity')]
(function$ arity env (prepare-body inner-arity arity bodyS')))
bodyS
(function$ +1 env (prepare-body inner-arity +1 bodyS))))
(#la;Apply _)
(let [[funcA argsA] (&&function;unfold-apply exprA)
funcS (recur +0 resolver num-locals funcA)
argsS (list/map (recur +0 resolver num-locals) argsA)]
(case funcS
(^multi (^ [_ (#;Form (list [_ (#;Text "lux function")] [_ (#;Nat _arity)] [_ (#;Tuple _env)] _bodyS))])
(and (n.= _arity (list;size argsS))
(not (&&loop;contains-self-reference? _bodyS)))
[(parse-environment _env) (#e;Success _env)])
(let [register-offset (if (&&function;top? outer-arity)
num-locals
(|> outer-arity n.inc (n.+ num-locals)))]
(` ("lux loop" (~ (code;nat register-offset)) [(~@ argsS)]
(~ (&&loop;adjust _env register-offset _bodyS)))))
(^ [_ (#;Form (list& [_ (#;Text "lux call")] funcS' argsS'))])
(call$ funcS' (list/compose argsS' argsS))
_
(call$ funcS argsS)))
(#la;Procedure name args)
(procedure$ name (list/map (recur +0 resolver num-locals) args))
)))
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