.

[clean-tests.git] / test.icl

diff --git a/test.icl b/test.icl
index 6459207..822f41d 100644 (file)
--- a/test.icl
+++ b/test.icl
@@ -1,18 +1,38 @@
 module test
 
 import StdEnv
-from Data.Func import $
-import System.Directory
-import System.Time
+import Data.Maybe
+import Data.Functor
+import Control.Monad
+import Control.Applicative
 
-:: S s a = S .(s -> *(a, s))
-runS (S s) = s
+class expr v where
+       lit :: i -> v i | toString i
+       (+.) infixl 6 :: (v i) (v i) -> v i | + i
 
-(>>=) infixl 1 :: u:(S .a .b) v:(.b -> .(S .a .c)) -> w:(S .a .c), [w <= u,w <= v]
-(>>=) ma a2mb = S \s
-       # (a, s) = runS ma s
-       = runS (a2mb a) s
+instance + (v a) | expr v & + a where
+       + l r = l +. r
 
-Start world = flip runS world
-       $   (S time)
-       >>= \_->S (readDirectory "/home/mrl")
+eval :: (Maybe a) -> Maybe a
+eval x = x
+instance expr Maybe where
+       lit i = Just i
+       +. x y = (+) <$> x <*> y
+
+:: Print a =: Print String
+print :: (Print a) -> String
+print (Print a) = a
+instance expr Print where
+       lit i = Print (toString i)
+       +. (Print l) (Print r) = Print (l +++ "+" +++ r)
+
+printEval :: (A.v: v a | expr v) -> (Maybe a, String)
+//printEval f = (f, let (Print p) = f in p)
+printEval f = (eval f, print f)
+
+//Mag niet
+//Start :: (Maybe Int, String)
+//Start = printEval (lit 4 + lit 38)
+
+//Mag wel
+Start = let (Print f) = lit 4 + lit 38 in f