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-rw-r--r--stdlib/source/lux/type/quotient.lux68
1 files changed, 68 insertions, 0 deletions
diff --git a/stdlib/source/lux/type/quotient.lux b/stdlib/source/lux/type/quotient.lux
new file mode 100644
index 000000000..205d8d579
--- /dev/null
+++ b/stdlib/source/lux/type/quotient.lux
@@ -0,0 +1,68 @@
+(.module:
+ [lux #- type]
+ (lux (control [monad #+ do]
+ ["p" parser])
+ (data ["e" error #+ Error])
+ (lang [type])
+ (type abstract)
+ [macro]
+ (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.this ..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)))))