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|
(.module:
[lux (#- type)
[control
[monad (#+ do)]
["p" parser]]
[data
["e" error (#+ Error)]]
[language
["." type]]
[type
abstract]
["." macro
["s" syntax (#+ syntax:)]
["." poly]]])
(abstract: #export (Class t c q)
{}
(-> t c)
(def: #export class
(All [t c]
(Ex [q]
(-> (-> t c) (Class t c q))))
(|>> :abstraction))
(def: expose
(All [t c q] (-> (Class t c q) (-> t c)))
(|>> :representation))
)
(abstract: #export (Quotient t c q)
{}
{#value t
#label c}
(def: #export (quotient class value)
(All [t c q]
(-> (Class t c q) t
(Quotient t c q)))
(:abstraction {#value value
#label ((expose class) value)}))
(do-template [<name> <output> <slot>]
[(def: #export <name>
(All [t c q] (-> (Quotient t c q) <output>))
(|>> :representation (get@ <slot>)))]
[value t #value]
[label c #label]
)
)
(def: (quotient-type constructor-type)
(-> Type (Error Type))
(<| (poly.run constructor-type)
(do p.Monad<Parser>
[[valueT classT quotient-ex] (<| poly.apply (p.after (poly.exactly ..Class))
($_ p.seq poly.any poly.any poly.existential))]
(wrap (.type (..Quotient valueT classT (:~ (#.Ex quotient-ex))))))))
(syntax: #export (type {quotient s.symbol})
(do @
[constructorT (macro.find-type quotient)
quotientT (case (quotient-type constructorT)
(#e.Success quotientT)
(wrap quotientT)
(#e.Error error)
(p.fail error))]
(wrap (list (type.to-code quotientT)))))
|
