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-rw-r--r--stdlib/source/lux/control/function/mixin.lux63
-rw-r--r--stdlib/source/test/lux.lux10
2 files changed, 69 insertions, 4 deletions
diff --git a/stdlib/source/lux/control/function/mixin.lux b/stdlib/source/lux/control/function/mixin.lux
new file mode 100644
index 000000000..4a79bb99a
--- /dev/null
+++ b/stdlib/source/lux/control/function/mixin.lux
@@ -0,0 +1,63 @@
+## Inspired by;
+## "The Different Aspects of Monads and Mixins" by Bruno C. d. S. Oliveira
+
+(.module:
+ [lux #*
+ [abstract
+ [monoid (#+ Monoid)]
+ [predicate (#+ Predicate)]
+ [monad (#+ Monad do)]]])
+
+(type: #export (Mixin m)
+ (-> m m m))
+
+(def: #export (mixin f)
+ (All [i o] (-> (Mixin (-> i o)) (-> i o)))
+ (function (mix input)
+ ((f mix mix) input)))
+
+(def: #export nothing
+ Mixin
+ (function (_ super self)
+ super))
+
+(def: #export (inherit parent child)
+ (All [m] (-> (Mixin m) (Mixin m) (Mixin m)))
+ (function (_ super self)
+ (parent (child super self) self)))
+
+(structure: #export monoid
+ (All [m] (Monoid (Mixin m)))
+
+ (def: identity ..nothing)
+ (def: compose ..inherit))
+
+(type: #export (Recursive i o)
+ (-> (-> i o) (-> i o)))
+
+(def: #export (from-recursive recursive)
+ (All [i o] (-> (Recursive i o) (Mixin (-> i o))))
+ (function (_ delegate recur)
+ (recursive recur)))
+
+(def: #export (advice when then)
+ (All [i o] (-> (Predicate i) (Mixin (-> i o)) (Mixin (-> i o))))
+ (function (_ delegate recur input)
+ (if (when input)
+ ((then delegate recur) input)
+ (delegate input))))
+
+(def: #export (before monad action)
+ (All [! i o] (-> (Monad !) (-> i (! Any)) (Mixin (-> i (! o)))))
+ (function (_ delegate recur input)
+ (do monad
+ [_ (action input)]
+ (delegate input))))
+
+(def: #export (after monad action)
+ (All [! i o] (-> (Monad !) (-> i o (! Any)) (Mixin (-> i (! o)))))
+ (function (_ delegate recur input)
+ (do monad
+ [output (delegate input)
+ _ (action input output)]
+ (wrap output))))
diff --git a/stdlib/source/test/lux.lux b/stdlib/source/test/lux.lux
index db3a84ce7..22208adcc 100644
--- a/stdlib/source/test/lux.lux
+++ b/stdlib/source/test/lux.lux
@@ -3,9 +3,10 @@
[structure (#+)]
[function (#+)]
[reference (#+)]
- [case (#+)]
- [loop (#+)]
- [extension (#+)])]
+ ## [case (#+)]
+ ## [loop (#+)]
+ ## [extension (#+)]
+ )]
(.module:
["/" lux #*
[abstract
@@ -13,7 +14,8 @@
[predicate (#+ Predicate)]]
[control
["." io (#+ io)]
- ["." function]
+ ["." function
+ [mixin (#+)]]
[parser
[cli (#+ program:)]]]
[data