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|
(;module:
lux
(lux (control [monad #+ do Monad]
[eq]
["p" parser])
(data [text "text/" Monoid<Text>]
text/format
(coll [list "L/" Monad<List>]
[vector]
[array]
[queue]
[set]
[seq]
[dict #+ Dict]
(tree [rose]))
[number "nat/" Codec<Text,Nat>]
[product]
[bool]
[maybe])
[macro #+ Monad<Lux> with-gensyms]
(macro [code]
[syntax #+ syntax: Syntax]
(syntax [common])
[poly #+ poly:])
[type]
))
## [Derivers]
(poly: #export Eq<?>
(with-expansions
[<basic> (do-template [<type> <matcher> <eq>]
[(do @
[[primT _] (p;seq poly;peek <matcher>)]
(wrap (` (: (~ (@Eq primT))
<eq>))))]
[Unit poly;unit (function [(~' test) (~' input)] true)]
[Bool poly;bool bool;Eq<Bool>]
[Nat poly;nat number;Eq<Nat>]
[Int poly;int number;Eq<Int>]
[Deg poly;deg number;Eq<Deg>]
[Real poly;real number;Eq<Real>]
[Text poly;text text;Eq<Text>])
<composites> (do-template [<name> <eq>]
[(do @
[[collT [_ argC]] (p;seq poly;peek
(poly;apply (p;seq (poly;named (ident-for <name>))
Eq<?>)))]
(wrap (` (: (~ (@Eq collT))
(<eq> (~ argC))))))]
## [;Maybe maybe;Eq<Maybe>]
## [;List list;Eq<List>]
[vector;Vector vector;Eq<Vector>]
[array;Array array;Eq<Array>]
[queue;Queue queue;Eq<Queue>]
[set;Set set;Eq<Set>]
[seq;Seq seq;Eq<Seq>]
[rose;Tree rose;Eq<Tree>]
)]
(do @
[*env* poly;env
#let [@Eq (: (-> Type Code)
(function [type]
(` (eq;Eq (~ (poly;to-ast *env* type))))))]]
($_ p;either
## Primitive types
<basic>
## Composite types
<composites>
(do @
[[collT [_ _ valC]] (p;seq poly;peek
(poly;apply ($_ p;seq
(poly;named (ident-for dict;Dict))
poly;any
Eq<?>)))]
(wrap (` (: (~ (@Eq collT))
(dict;Eq<Dict> (~ valC))))))
## Variants
(do @
[[variantT members] (p;seq poly;peek
(poly;variant (p;many Eq<?>)))
#let [g!left (code;local-symbol "\u0000left")
g!right (code;local-symbol "\u0000right")]]
(wrap (` (: (~ (@Eq variantT))
(function [(~ g!left) (~ g!right)]
(case [(~ g!left) (~ g!right)]
(~@ (L/join (L/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))))))))))
## Tuples
(do @
[[tupleT g!eqs] (p;seq poly;peek
(poly;tuple (p;many Eq<?>)))
#let [indices (|> (list;size g!eqs) n.dec (list;n.range +0))
g!lefts (L/map (|>. nat/encode (text/append "left") code;local-symbol) indices)
g!rights (L/map (|>. nat/encode (text/append "right") code;local-symbol) indices)]]
(wrap (` (: (~ (@Eq tupleT))
(function [[(~@ g!lefts)] [(~@ g!rights)]]
(and (~@ (|> (list;zip3 g!eqs g!lefts g!rights)
(L/map (function [[g!eq g!left g!right]]
(` ((~ g!eq) (~ g!left) (~ g!right)))))))))))))
## Type recursion
(do @
[[recT [g!self bodyC]] (p;seq poly;peek
(poly;recursive Eq<?>))]
(wrap (` (: (~ (@Eq recT))
(eq;rec (;function [(~ 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 @
[[polyT [funcC varsC bodyC]] (p;seq poly;peek
(poly;polymorphic Eq<?>))]
(wrap (` (: (All [(~@ varsC)]
(-> (~@ (L/map (|>. (~) eq;Eq (`)) varsC))
(eq;Eq ((~ (poly;to-ast *env* polyT)) (~@ varsC)))))
(function (~ funcC) [(~@ varsC)]
(~ bodyC))))))
poly;recursive-call
## If all else fails...
(|> poly;any
(:: @ map (|>. %type (format "Cannot create Eq for: ") p;fail))
(:: @ join))
))))
|
