backup commit

examples/dummy_project/main.orc

@@ -1,23 +1,46 @@
--- import std::io::(println, out) -- imports
+opaque := \T. T
 
--- single word rule (alias)
-greet =1=> (\name. printf out "Hello {}!\n" [name])
-
--- multi-word exported rule
-export ;> $a =200=> (greet $a)
-
-reeee := \$a.b
-
--- single-word exported rule
-export main := (
-    print "What is your name?" >>
-    readln >>= \name.
-    greet name
+--[ Typeclass definition (also just a type) ]--
+define Add $L:type $R:type $O:type as $L -> $R -> $O
+-- HKTC
+define Mappable $C:(type -> type) as @T. @U. (T -> U) -> $C T -> $C U
+-- Dependency on existing typeclass
+define Zippable $C:(type -> type) as @:Mappable $C. (
+    @T. @U. @V. (T -> U -> V) -> $C T -> $C U -> $C V
 )
+define Default $T:type as $T
+-- Is the intersection of typeclasses an operation we need?
 
-export < $a ...$rest /> := (createElement (tok_to_str $a) [(props_carriage ...$rest)])
-export (props_carriage $key = $value) := (tok_to_str $key) => $value
+--[ Type definition ]--
+define Cons $elem:type as loop \r. Option (Pair T $elem)
+nil := @T. from @(Cons T) none
+cons := @T. \el:T. (
+    generalise @(Cons T) 
+    |> (\list. some t[el, into list]) 
+    |> categorise @(Cons T)
+)
+export map := @T. @U. \f:T -> U. (
+    generalise @(Cons T)
+    |> loop ( \recurse. \option.
+        map option \pair. t[f (fst pair), recurse (snd pair)] 
+    )
+    |> categorise @(Cons U) 
+)
+-- Universal typeclass implementation; no parameters, no overrides, no name for overriding
+impl Mappable Cons via map
+-- Blanket typeclass implementation; parametric, may override, must have name for overriding
+impl (@T. Add (Cons T) (Cons T) (Cons T)) by concatenation over elementwiseAddition via concat
 
--- The broadest trait definition in existence
-Foo := (Bar Baz)
--- default anyFoo = @T. @impl:(T (Bar Baz)). impl:(T Foo)
+-- Scratchpad
+
+filterBadWords := @C:type -> type. @:Mappable C. \strings:C String. (
+    map strings \s. if intersects badWords (slice " " s) then none else some s
+):(C (Option String))
+
+-- /Scratchpad
+
+main := \x. foo @bar x
+
+foo := @util. \x. util x
+
+export opaque := \T. atom