gitignore

[fp.git] / src / Lambda.hs

diff --git a/src/Lambda.hs b/src/Lambda.hs
index 3026b75..428ac99 100644 (file)
--- a/src/Lambda.hs
+++ b/src/Lambda.hs
@@ -26,6 +26,9 @@ import Control.Monad.State
 
 import Lambda.Term
 
+import Debug.Trace
+import Lambda.Parser.Fancy ()
+
 -- $setup
 -- >>> import Control.Applicative
 -- >>> import Lambda.Parser.Fancy
@@ -133,14 +136,22 @@ travPre fnc term = tr fnc (term, E, Down)
 -- >>> toNormalForm Lazy 100 $ (App (App cK cI) cY)
 -- Just (λx.x)
 --
--- prop> within 10000000 $ (\ t u -> t == u || t == Nothing || u == Nothing) (alphaNorm <$> toNormalForm Lazy 1000 x) (alphaNorm <$> toNormalForm Eager 1000 x)
+-- prop> within 10000000 $ (\ t u -> t == u || t == Nothing || u == Nothing) (alphaNorm <$> toNormalForm Lazy 100 x) (alphaNorm <$> toNormalForm Eager 100 x)
 
 -- inf = tRead "(\\d.a ((\\d c.c d c) (\\x y z.x z (y z)) (\\f.(\\x.f (x x)) (\\x.f (x x))) e))"
 
+
+toNormalFormDebug :: Strategy -> Int -> Term -> Maybe Term
+toNormalFormDebug Eager n = flip evalStateT 0 . travPost (prnt >=> cnt >=> short n >=> return . reduceStep)
+toNormalFormDebug Lazy  n = flip evalStateT 0 . travPre  (prnt >=> cnt >=> short n >=> return . reduceStep)
+
 toNormalForm :: Strategy -> Int -> Term -> Maybe Term
 toNormalForm Eager n = flip evalStateT 0 . travPost (cnt >=> short n >=> return . reduceStep)
 toNormalForm Lazy  n = flip evalStateT 0 . travPre  (cnt >=> short n >=> return . reduceStep)
 
+prnt :: (Monad m) => Term -> StateT Int m Term
+prnt t = traceShow t $ return t
+
 cnt :: (Monad m) => Term -> StateT Int m Term
 cnt t@RedEx{} = do
   modify (+ 1)