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|
(.module:
lux
(lux (control [monad #+ do Monad]
["eq" equality]
["p" parser])
(data [text "text/" Monoid<Text>]
text/format
(coll [list "list/" Monad<List>]
[row]
[array]
[queue]
(set ["set" unordered])
(dictionary ["dict" unordered #+ Dict])
(tree [rose]))
[number "nat/" Codec<Text,Nat>]
[product]
[bool]
[maybe])
(time ["du" duration]
["da" date]
["i" instant])
[macro]
(macro [code]
[syntax #+ syntax: Syntax]
(syntax [common])
[poly #+ poly:])
(type [unit])
(lang [type])
))
## [Derivers]
(poly: #export Eq<?>
(`` (do @
[#let [g!_ (code.local-symbol "_____________")]
*env* poly.env
inputT poly.peek
#let [@Eq (: (-> Type Code)
(function (_ type)
(` (eq.Eq (~ (poly.to-code *env* type))))))]]
($_ p.either
## Basic types
(~~ (do-template [<matcher> <eq>]
[(do @
[_ <matcher>]
(wrap (` (: (~ (@Eq inputT))
<eq>))))]
[(poly.this Any) (function ((~ g!_) (~ g!_) (~ g!_)) true)]
[(poly.like Bool) bool.Eq<Bool>]
[(poly.like Nat) number.Eq<Nat>]
[(poly.like Int) number.Eq<Int>]
[(poly.like Deg) number.Eq<Deg>]
[(poly.like Frac) number.Eq<Frac>]
[(poly.like Text) text.Eq<Text>]))
## Composite types
(~~ (do-template [<name> <eq>]
[(do @
[[_ argC] (poly.apply (p.seq (poly.this <name>)
Eq<?>))]
(wrap (` (: (~ (@Eq inputT))
(<eq> (~ argC))))))]
[.Maybe maybe.Eq<Maybe>]
[.List list.Eq<List>]
[row.Row row.Eq<Row>]
[.Array array.Eq<Array>]
[queue.Queue queue.Eq<Queue>]
[set.Set set.Eq<Set>]
[rose.Tree rose.Eq<Tree>]
))
(do @
[[_ _ valC] (poly.apply ($_ p.seq
(poly.this dict.Dict)
poly.any
Eq<?>))]
(wrap (` (: (~ (@Eq inputT))
(dict.Eq<Dict> (~ valC))))))
## Models
(~~ (do-template [<type> <eq>]
[(do @
[_ (poly.this <type>)]
(wrap (` (: (~ (@Eq inputT))
<eq>))))]
[du.Duration du.Eq<Duration>]
[i.Instant i.Eq<Instant>]
[da.Date da.Eq<Date>]
[da.Day da.Eq<Day>]
[da.Month da.Eq<Month>]))
(do @
[_ (poly.apply (p.seq (poly.this unit.Qty)
poly.any))]
(wrap (` (: (~ (@Eq inputT))
unit.Eq<Qty>))))
## Variants
(do @
[members (poly.variant (p.many Eq<?>))
#let [g!_ (code.local-symbol "_____________")
g!left (code.local-symbol "_____________left")
g!right (code.local-symbol "_____________right")]]
(wrap (` (: (~ (@Eq inputT))
(function ((~ g!_) (~ g!left) (~ g!right))
(case [(~ g!left) (~ g!right)]
(~+ (list/join (list/map (function (_ [tag g!eq])
(list (` [((~ (code.nat tag)) (~ g!left))
((~ (code.nat tag)) (~ g!right))])
(` ((~ g!eq) (~ g!left) (~ g!right)))))
(list.enumerate members))))
(~ g!_)
false))))))
## Tuples
(do @
[g!eqs (poly.tuple (p.many Eq<?>))
#let [g!_ (code.local-symbol "_____________")
indices (|> (list.size g!eqs) dec (list.n/range +0))
g!lefts (list/map (|>> nat/encode (text/compose "left") code.local-symbol) indices)
g!rights (list/map (|>> nat/encode (text/compose "right") code.local-symbol) indices)]]
(wrap (` (: (~ (@Eq inputT))
(function ((~ g!_) [(~+ g!lefts)] [(~+ g!rights)])
(and (~+ (|> (list.zip3 g!eqs g!lefts g!rights)
(list/map (function (_ [g!eq g!left g!right])
(` ((~ g!eq) (~ g!left) (~ g!right)))))))))))))
## Type recursion
(do @
[[g!self bodyC] (poly.recursive Eq<?>)
#let [g!_ (code.local-symbol "_____________")]]
(wrap (` (: (~ (@Eq inputT))
(eq.rec (.function ((~ g!_) (~ g!self))
(~ bodyC)))))))
poly.recursive-self
## Type applications
(do @
[[funcC argsC] (poly.apply (p.seq Eq<?> (p.many Eq<?>)))]
(wrap (` ((~ funcC) (~+ argsC)))))
## Bound type-vars
poly.bound
## Polymorphism
(do @
[[funcC varsC bodyC] (poly.polymorphic Eq<?>)]
(wrap (` (: (All [(~+ varsC)]
(-> (~+ (list/map (|>> (~) eq.Eq (`)) varsC))
(eq.Eq ((~ (poly.to-code *env* inputT)) (~+ varsC)))))
(function ((~ funcC) (~+ varsC))
(~ bodyC))))))
poly.recursive-call
## If all else fails...
(|> poly.any
(:: @ map (|>> %type (format "Cannot create Eq for: ") p.fail))
(:: @ join))
))))
|
