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(.module:
[library
[lux #*
[abstract
[monad (#+ Monad do)]]
[control
["p" parser
["<.>" type]
["s" code (#+ Parser)]]]
[data
["." product]
["." text
["%" format (#+ format)]]
[collection
["." list ("#\." monad monoid)]]]
[macro
[syntax (#+ syntax:)]
["." code]]
[math
[number
["n" nat]]]
["." type
["." poly (#+ poly:)]]]]
[\\library
["." /]])
(poly: .public functor
(do {! p.monad}
[.let [type_funcC (code.local_identifier "____________type_funcC")
funcC (code.local_identifier "____________funcC")
inputC (code.local_identifier "____________inputC")]
*env* <type>.env
inputT <type>.next
[polyC varsC non_functorT] (<type>.local (list inputT)
(<type>.polymorphic <type>.any))
.let [num_vars (list.size varsC)]
.let [@Functor (: (-> Type Code)
(function (_ unwrappedT)
(if (n.= 1 num_vars)
(` ((~! /.Functor) (~ (poly.code *env* unwrappedT))))
(let [paramsC (|> num_vars -- list.indices (list\map (|>> %.nat code.local_identifier)))]
(` (All [(~+ paramsC)]
((~! /.Functor) ((~ (poly.code *env* unwrappedT)) (~+ paramsC)))))))))
Arg<?> (: (-> Code (<type>.Parser Code))
(function (Arg<?> valueC)
($_ p.either
... Type-var
(do p.monad
[.let [varI (|> num_vars (n.* 2) --)]
_ (<type>.parameter! varI)]
(in (` ((~ funcC) (~ valueC)))))
... Variants
(do !
[_ (in [])
membersC (<type>.variant (p.many (Arg<?> valueC)))
.let [last (-- (list.size membersC))]]
(in (` (case (~ valueC)
(~+ (list\join (list\map (function (_ [tag memberC])
(if (n.= last tag)
(list (` ((~ (code.nat (-- tag))) #1 (~ valueC)))
(` ((~ (code.nat (-- tag))) #1 (~ memberC))))
(list (` ((~ (code.nat tag)) #0 (~ valueC)))
(` ((~ (code.nat tag)) #0 (~ memberC))))))
(list.enumeration membersC))))))))
... Tuples
(do p.monad
[pairsCC (: (<type>.Parser (List [Code Code]))
(<type>.tuple (loop [idx 0
pairsCC (: (List [Code Code])
(list))]
(p.either (let [slotC (|> idx %.nat (format "____________slot") code.local_identifier)]
(do !
[_ (in [])
memberC (Arg<?> slotC)]
(recur (++ idx)
(list\compose pairsCC (list [slotC memberC])))))
(in pairsCC)))))]
(in (` (case (~ valueC)
[(~+ (list\map product.left pairsCC))]
[(~+ (list\map product.right pairsCC))]))))
... Functions
(do !
[_ (in [])
.let [g! (code.local_identifier "____________")
outL (code.local_identifier "____________outL")]
[inT+ outC] (<type>.function (p.many <type>.any)
(Arg<?> outL))
.let [inC+ (|> (list.size inT+)
list.indices
(list\map (|>> %.nat (format "____________inC") code.local_identifier)))]]
(in (` (function ((~ g!) (~+ inC+))
(let [(~ outL) ((~ valueC) (~+ inC+))]
(~ outC))))))
... Recursion
(do p.monad
[_ <type>.recursive_call]
(in (` ((~' map) (~ funcC) (~ valueC)))))
... Parameters
(do p.monad
[_ <type>.any]
(in valueC))
)))]
[_ _ outputC] (: (<type>.Parser [Code (List Code) Code])
(p.either (<type>.polymorphic
(Arg<?> inputC))
(p.failure (format "Cannot create Functor for: " (%.type inputT)))))]
(in (` (: (~ (@Functor inputT))
(implementation
(def: ((~' map) (~ funcC) (~ inputC))
(~ outputC))))))))
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