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(;module:
lux
(lux (data text/format
[number]
[product]
(coll [list "L/" Functor<List> Fold<List> Monoid<List>]
["d" dict])))
(luxc ["&" base]
(lang ["la" analysis]
["ls" synthesis])
(synthesizer ["&&;" structure]
["&&;" case]
["&&;" function]
["&&;" loop])
))
(def: init-env (List ls;Variable) (list))
(def: init-resolver (d;Dict Int Int) (d;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: #export (synthesize analysis)
(-> la;Analysis ls;Synthesis)
(loop [outer-arity +0
resolver init-resolver
num-locals +0
exprA analysis]
(case exprA
(^template [<from> <to>]
(<from> value)
(<to> value))
([#la;Unit #ls;Unit]
[#la;Bool #ls;Bool]
[#la;Nat #ls;Nat]
[#la;Int #ls;Int]
[#la;Deg #ls;Deg]
[#la;Frac #ls;Frac]
[#la;Text #ls;Text]
[#la;Definition #ls;Definition])
(#la;Product _)
(#ls;Tuple (L/map (recur +0 resolver num-locals) (&&structure;unfold-tuple exprA)))
(#la;Sum choice)
(let [[tag last? value] (&&structure;unfold-variant choice)]
(#ls;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)
(<| (#ls;Call (#ls;Variable 0))
(L/map (|>. &&function;to-local #ls;Variable))
(list;n.range +1 (n.dec outer-arity)))
(#ls;Variable (&&function;adjust-var outer-arity (&&function;to-local register))))
(#ls;Variable (&&function;to-local register)))
(#;Captured register)
(#ls;Variable (let [var (&&function;to-captured register)]
(default var (d;get var resolver)))))
(#la;Case inputA branchesA)
(let [inputS (recur +0 resolver num-locals 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]))
(#ls;Let register inputS (recur +0 resolver num-locals bodyA))
(^or (^ (list [(#la;BoolP true) thenA] [(#la;BoolP false) elseA]))
(^ (list [(#la;BoolP false) elseA] [(#la;BoolP true) thenA])))
(#ls;If inputS
(recur +0 resolver num-locals thenA)
(recur +0 resolver num-locals elseA))
(#;Cons [lastP lastA] prevsPA)
(let [transform-branch (: (-> la;Pattern la;Analysis ls;Path)
(function [pattern expr]
(|> (recur +0 resolver num-locals expr)
#ls;ExecP
(#ls;SeqP (&&case;path pattern)))))]
(#ls;Case inputS
(L/fold &&case;weave
(transform-branch lastP lastA)
(L/map (product;uncurry transform-branch) prevsPA))))
_
(undefined)
))
(#la;Function scope bodyA)
(let [inner-arity (n.inc outer-arity)
raw-env (&&function;environment scope)
env (L/map (function [var] (default var (d;get var resolver))) raw-env)
env-vars (let [env-size (list;size raw-env)]
(: (List ls;Variable)
(case env-size
+0 (list)
_ (L/map &&function;to-captured (list;n.range +0 (n.dec env-size))))))
resolver' (if (&&function;nested? inner-arity)
(L/fold (function [[from to] resolver']
(d;put from to resolver'))
init-resolver
(list;zip2 env-vars env))
(L/fold (function [var resolver']
(d;put var var resolver'))
init-resolver
env-vars))]
(case (recur inner-arity resolver' +0 bodyA)
(#ls;Function arity' env' bodyS')
(let [arity (n.inc arity')]
(#ls;Function arity env (prepare-body inner-arity arity bodyS')))
bodyS
(#ls;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 (L/map (recur +0 resolver num-locals) argsA)]
(case funcS
(^multi (#ls;Function _arity _env _bodyS)
(and (n.= _arity (list;size argsS))
(not (&&loop;contains-self-reference? _bodyS))))
(let [register-offset (if (&&function;top? outer-arity)
num-locals
(|> outer-arity n.inc (n.+ num-locals)))]
(#ls;Loop register-offset argsS
(&&loop;adjust _env register-offset _bodyS)))
(#ls;Call funcS' argsS')
(#ls;Call funcS' (L/append argsS' argsS))
_
(#ls;Call funcS argsS)))
(#la;Procedure name args)
(#ls;Procedure name (L/map (recur +0 resolver num-locals) args))
)))
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