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(;module:
lux
(lux (control [monad #+ do]
["p" parser])
(data [maybe]
(coll [list "list/" Functor<List>]))
(meta [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 outer-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
(^ [_ (#;Form (list [_ (#;Nat tag)] last? valueS))])
(` ((~ (code;nat tag)) (~ last?) (~ (recur valueS))))
[_ (#;Tuple members)]
[_ (#;Tuple (list/map recur members))]
(^ [_ (#;Form (list [_ (#;Text "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"])
(^ [_ (#;Form (list [_ (#;Text "lux case exec")] bodyS))])
(` ("lux case exec" (~ (adjust' bodyS))))
_
pathS))))))
(^ [_ (#;Form (list [_ (#;Text "lux function")] arity [_ (#;Tuple environment)] bodyS))])
(` ("lux function" (~ arity)
(~ [_ (#;Tuple (list/map (function [_var]
(case _var
(^ [_ (#;Form (list [_ (#;Int var)]))])
(` ((~ (code;int (resolve-captured var)))))
_
_var))
environment))])
(~ (recur 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))))
(^ [_ (#;Form (list& [_ (#;Text procedure)] argsS))])
(` ((~ (code;text procedure)) (~@ (list/map recur argsS))))
(^ [_ (#;Form (list [_ (#;Int var)]))])
(if (variableL;captured? var)
(` ((~ (code;int (resolve-captured var)))))
(` ((~ (code;int (|> outer-offset nat-to-int (i.+ var)))))))
(^ [_ (#;Form (list [_ (#;Text "lux let")] [_ (#;Nat register)] inputS bodyS))])
(` ("lux let" (~ (code;nat (n.+ outer-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 inner-offset)] [_ (#;Tuple initsS)] bodyS))])
(` ("lux loop" (~ (code;nat (n.+ outer-offset inner-offset)))
[(~@ (list/map recur initsS))]
(~ (recur bodyS))))
_
exprS
))))
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