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(.module:
[lux #*
[abstract
[monad (#+ Monad do)]]
[control
["p" parser
["<.>" type]
["s" code (#+ Parser)]]]
[data
["." product]
[number
["n" nat]]
["." text
["%" format (#+ format)]]
[collection
["." list ("#;." monad monoid)]]]
["." macro
["." code]
[syntax (#+ syntax:)
["." common]]
["." poly (#+ poly:)]]
["." type]]
{1
["." /]})
(poly: #export functor
(do @
[#let [type-funcC (code.local-identifier "____________type-funcC")
funcC (code.local-identifier "____________funcC")
inputC (code.local-identifier "____________inputC")]
*env* <type>.env
inputT <type>.peek
[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.to-code *env* unwrappedT))))
(let [paramsC (|> num-vars dec list.indices (list;map (|>> %.nat code.local-identifier)))]
(` (All [(~+ paramsC)]
((~! /.Functor) ((~ (poly.to-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) dec)]
_ (<type>.parameter! varI)]
(wrap (` ((~ funcC) (~ valueC)))))
## Variants
(do @
[_ (wrap [])
membersC (<type>.variant (p.many (Arg<?> valueC)))]
(wrap (` (case (~ valueC)
(~+ (list;join (list;map (function (_ [tag memberC])
(list (` ((~ (code.nat tag)) (~ valueC)))
(` ((~ (code.nat tag)) (~ memberC)))))
(list.enumerate 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 @
[_ (wrap [])
memberC (Arg<?> slotC)]
(recur (inc idx)
(list;compose pairsCC (list [slotC memberC])))))
(wrap pairsCC)))))]
(wrap (` (case (~ valueC)
[(~+ (list;map product.left pairsCC))]
[(~+ (list;map product.right pairsCC))]))))
## Functions
(do @
[_ (wrap [])
#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)))]]
(wrap (` (function ((~ g!) (~+ inC+))
(let [(~ outL) ((~ valueC) (~+ inC+))]
(~ outC))))))
## Recursion
(do p.monad
[_ <type>.recursive-call]
(wrap (` ((~' map) (~ funcC) (~ valueC)))))
## Parameters
(do p.monad
[_ <type>.any]
(wrap valueC))
)))]
[_ _ outputC] (: (<type>.Parser [Code (List Code) Code])
(p.either (<type>.polymorphic
(Arg<?> inputC))
(p.fail (format "Cannot create Functor for: " (%.type inputT)))))]
(wrap (` (: (~ (@Functor inputT))
(structure (def: ((~' map) (~ funcC) (~ inputC))
(~ outputC))))))))
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