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(.module:
lux
(lux (control [monad #+ do]
["p" parser])
(data [maybe]
(coll [list "list/" Functor<List>]))
(macro [code]
[syntax]))
(luxc (lang ["ls" synthesis]
[".L" variable #+ Variable Register])))
(def: #export (contains-self-reference? exprS)
(-> ls.Synthesis Bool)
(case exprS
(^ [_ (#.Form (list [_ (#.Nat tag)] [_ (#.Bool last?)] memberS))])
(contains-self-reference? memberS)
[_ (#.Tuple membersS)]
(list.any? contains-self-reference? membersS)
(^ [_ (#.Form (list [_ (#.Int var)]))])
(variableL.self? var)
(^ [_ (#.Form (list [_ (#.Text "lux case")] inputS pathS))])
(or (contains-self-reference? inputS)
(loop [pathS pathS]
(case pathS
(^or (^ [_ (#.Form (list [_ (#.Text "lux case alt")] leftS rightS))])
(^ [_ (#.Form (list [_ (#.Text "lux case seq")] leftS rightS))]))
(or (recur leftS)
(recur rightS))
(^ [_ (#.Form (list [_ (#.Text "lux case exec")] bodyS))])
(contains-self-reference? bodyS)
_
false)))
(^ [_ (#.Form (list [_ (#.Text "lux function")] arity [_ (#.Tuple environment)] bodyS))])
(list.any? (function (_ captured)
(case captured
(^ [_ (#.Form (list [_ (#.Int var)]))])
(variableL.self? var)
_
false))
environment)
(^ [_ (#.Form (list& [_ (#.Text "lux call")] funcS argsS))])
(or (contains-self-reference? funcS)
(list.any? contains-self-reference? argsS))
(^ [_ (#.Form (list [_ (#.Text "lux let")] register inputS bodyS))])
(or (contains-self-reference? inputS)
(contains-self-reference? bodyS))
(^ [_ (#.Form (list [_ (#.Text "lux if")] inputS thenS elseS))])
(or (contains-self-reference? inputS)
(contains-self-reference? thenS)
(contains-self-reference? elseS))
(^ [_ (#.Form (list [_ (#.Text "lux loop")] offset [_ (#.Tuple initsS)] bodyS))])
(or (list.any? contains-self-reference? initsS)
(contains-self-reference? bodyS))
(^or (^ [_ (#.Form (list& [_ (#.Text "lux recur")] argsS))])
(^ [_ (#.Form (list& [_ (#.Text procedure)] argsS))]))
(list.any? contains-self-reference? argsS)
_
false
))
(def: #export (reify-recursion arity exprS)
(-> Nat ls.Synthesis ls.Synthesis)
(loop [exprS exprS]
(case exprS
(^ [_ (#.Form (list [_ (#.Text "lux case")] inputS pathS))])
(` ("lux case" (~ inputS)
(~ (let [reify-recursion' recur]
(loop [pathS pathS]
(case pathS
(^ [_ (#.Form (list [_ (#.Text "lux case alt")] leftS rightS))])
(` ("lux case alt" (~ (recur leftS)) (~ (recur rightS))))
(^ [_ (#.Form (list [_ (#.Text "lux case seq")] leftS rightS))])
(` ("lux case seq" (~ leftS) (~ (recur rightS))))
(^ [_ (#.Form (list [_ (#.Text "lux case exec")] bodyS))])
(` ("lux case exec" (~ (reify-recursion' bodyS))))
_
pathS))))))
(^multi (^ [_ (#.Form (list& [_ (#.Text "lux call")]
[_ (#.Form (list [_ (#.Int 0)]))]
argsS))])
(n/= arity (list.size argsS)))
(` ("lux recur" (~+ argsS)))
(^ [_ (#.Form (list [_ (#.Text "lux let")] register inputS bodyS))])
(` ("lux let" (~ register) (~ inputS) (~ (recur bodyS))))
(^ [_ (#.Form (list [_ (#.Text "lux if")] inputS thenS elseS))])
(` ("lux if" (~ inputS) (~ (recur thenS)) (~ (recur elseS))))
_
exprS
)))
(def: #export (adjust env offset exprS)
(-> (List Variable) Register ls.Synthesis ls.Synthesis)
(let [resolve-captured (: (-> Variable Variable)
(function (_ var)
(let [idx (|> var (i/* -1) int-to-nat n/dec)]
(|> env (list.nth idx) maybe.assume))))]
(loop [exprS exprS]
(case exprS
(^code ((~ [_ (#.Nat tag)]) (~ last?) (~ valueS)))
(` ((~ (code.nat tag)) (~ last?) (~ (recur valueS))))
(^code [(~+ members)])
(` [(~+ (list/map recur members))])
(^code ("lux case" (~ inputS) (~ pathS)))
(` ("lux case" (~ (recur inputS))
(~ (let [adjust' recur]
(loop [pathS pathS]
(case pathS
(^template [<pattern>]
(^ [_ (#.Form (list [_ (#.Text <pattern>)] leftS rightS))])
(` (<pattern> (~ (recur leftS)) (~ (recur rightS)))))
(["lux case alt"]
["lux case seq"])
(^code ("lux case bind" (~ [_ (#.Nat register)])))
(` ("lux case bind" (~ (code.nat (n/+ offset register)))))
(^ [_ (#.Form (list [_ (#.Text "lux case exec")] bodyS))])
(` ("lux case exec" (~ (adjust' bodyS))))
_
pathS))))))
(^code ("lux function" (~ arity) [(~+ environment)] (~ bodyS)))
(` ("lux function" (~ arity)
[(~+ (list/map (function (_ _var)
(case _var
(^ [_ (#.Form (list [_ (#.Int var)]))])
(` ((~ (code.int (resolve-captured var)))))
_
_var))
environment))]
(~ bodyS)))
(^ [_ (#.Form (list& [_ (#.Text "lux call")] funcS argsS))])
(` ("lux call" (~ (recur funcS)) (~+ (list/map recur argsS))))
(^ [_ (#.Form (list& [_ (#.Text "lux recur")] argsS))])
(` ("lux recur" (~+ (list/map recur argsS))))
(^code ("lux let" (~ [_ (#.Nat register)]) (~ inputS) (~ bodyS)))
(` ("lux let" (~ (code.nat (n/+ offset register)))
(~ (recur inputS))
(~ (recur bodyS))))
(^ [_ (#.Form (list [_ (#.Text "lux if")] inputS thenS elseS))])
(` ("lux if" (~ (recur inputS))
(~ (recur thenS))
(~ (recur elseS))))
(^ [_ (#.Form (list [_ (#.Text "lux loop")] [_ (#.Nat loop-offset)] [_ (#.Tuple initsS)] bodyS))])
(` ("lux loop" (~ (code.nat (n/+ offset loop-offset)))
[(~+ (list/map recur initsS))]
(~ (recur bodyS))))
(^ [_ (#.Form (list [_ (#.Int var)]))])
(if (variableL.captured? var)
(` ((~ (code.int (resolve-captured var)))))
(` ((~ (code.int (|> offset nat-to-int (i/+ var)))))))
(^ [_ (#.Form (list& [_ (#.Text procedure)] argsS))])
(` ((~ (code.text procedure)) (~+ (list/map recur argsS))))
_
exprS
))))
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