1 files changed, 0 insertions, 193 deletions
diff --git a/src/tools/gftest/Graph.hs b/src/tools/gftest/Graph.hs
deleted file mode 100644
index a440bf12d..000000000
--- a/src/tools/gftest/Graph.hs
+++ /dev/null
@@ -1,193 +0,0 @@
-module Graph where
-
-import qualified Data.Map as M
-import Data.Map( Map, (!) )
-import qualified Data.Set as S
-import Data.Set( Set )
-import Data.List( nub, sort, (\\) )
---import Test.QuickCheck hiding ( generate )
-
--- == almost everything in this module is inspired by King & Launchbury ==
-
---------------------------------------------------------------------------------
--- depth-first trees
-
-data Tree a
-  = Node a [Tree a]
-  | Cut a
- deriving ( Eq, Show )
-
-type Forest a
-  = [Tree a]
-
-top :: Tree a -> a
-top (Node x _) = x
-top (Cut x)    = x
-
--- pruning a possibly infinite forest
-prune :: Ord a => Forest a -> Forest a
-prune ts = go S.empty ts
- where
-  go seen []             = []
-  go seen (Cut x    :ts) = Cut x : go seen ts
-  go seen (Node x vs:ts)
-    | x `S.member` seen  = Cut x : go seen ts
-    | otherwise          = Node x (take n ws) : drop n ws
-   where
-    n  = length vs
-    ws = go (S.insert x seen) (vs ++ ts)
-
--- pre- and post-order traversals
-preorder :: Tree a -> [a]
-preorder t = preorderF [t]
-
-preorderF :: Forest a -> [a]
-preorderF ts = go ts []
- where
-  go []               xs = xs
-  go (Cut x     : ts) xs = go ts xs
-  go (Node x vs : ts) xs = x : go vs (go ts xs)
-
-postorder :: Tree a -> [a]
-postorder t = postorderF [t]
-
-postorderF :: Forest a -> [a]
-postorderF ts = go ts []
- where
-  go []               xs = xs
-  go (Cut x     : ts) xs = go ts xs
-  go (Node x vs : ts) xs = go vs (x : go ts xs)
-
--- computing back-arrows
-backs :: Ord a => Tree a -> Set a
-backs t = S.fromList (go S.empty t)
- where
-  go ups (Node x ts) = concatMap (go (S.insert x ups)) ts
-  go ups (Cut x)     = [x | x `S.member` ups ]
-
---------------------------------------------------------------------------------
--- graphs
-
-type Graph a
-  = Map a [a]
-
-vertices :: Graph a -> [a]
-vertices g = [ x | (x,_) <- M.toList g ]
-
-transposeG :: Ord a => Graph a -> Graph a
-transposeG g =
-  M.fromListWith (++) $
-  [ (y,[x]) | (x,ys) <- M.toList g, y <- ys ] ++
-  [ (x,[])  | x <- vertices g ]
-
---------------------------------------------------------------------------------
--- graphs and trees
-
-generate :: Ord a => Graph a -> a -> Tree a
-generate g x = Node x (map (generate g) (g!x))
-
-dfs :: Ord a => Graph a -> [a] -> Forest a
-dfs g xs = prune (map (generate g) xs)
-
-reach :: Ord a => Graph a -> [a] -> Graph a
-reach g xs = M.fromList [ (x,g!x) | x <- preorderF (dfs g xs) ]
-
-dff :: Ord a => Graph a -> Forest a
-dff g = dfs g (vertices g)
-
-preOrd :: Ord a => Graph a -> [a]
-preOrd g = preorderF (dff g)
-
-postOrd :: Ord a => Graph a -> [a]
-postOrd g = postorderF (dff g)
-
-scc1 :: Ord a => Graph a -> Forest a
-scc1 g = reverse (dfs (transposeG g) (reverse (postOrd g)))
-
-scc2 :: Ord a => Graph a -> Forest a
-scc2 g = dfs g (reverse (postOrd (transposeG g)))
-
-scc :: Ord a => Graph a -> Forest a
-scc g = scc2 g
-
-sccs :: Ord a => Graph a -> [[a]]
-sccs = map preorder . scc
-
---------------------------------------------------------------------------------
--- testing correctness
-
-{-
-newtype G = G (Graph Int) deriving ( Show )
-
-set :: (Ord a, Num a, Arbitrary a) => Gen [a]
-set = (nub . sort . map abs) `fmap` arbitrary
-
-instance Arbitrary G where
-  arbitrary =
-    do xs  <- set `suchThat` (not . null)
-       yss <- sequence [ listOf (elements xs) | x <- xs ]
-       return (G (M.fromList (xs `zip` yss)))
-
-  shrink (G g) =
-    [ G (delNode x g)
-    | (x,_) <- M.toList g
-    ] ++
-    [ G (delEdge x y g)
-    | (x,ys) <- M.toList g
-    , y <- ys
-    ]
-   where
-    delNode v g =
-      M.fromList
-      [ (x,filter (v/=) ys)
-      | (x,ys) <- M.toList g
-      , x /= v
-      ]
-
-    delEdge v w g =
-      M.insert v ((g!v) \\ [w]) g
-
--- all vertices in a component can reach each other
-prop_Scc_StronglyConnected (G g) =
-  whenFail (print cs) $
-    and [ y `S.member` r | c <- cs, x <- c, let r = reach x, y <- c ]
- where
-  cs = sccs g
-
-  reach x = go S.empty [x]
-   where
-    go seen []            = seen
-    go seen (x:xs)
-      | x `S.member` seen = go seen xs
-      | otherwise         = go (S.insert x seen) ((g!x) ++ xs)
-
--- vertices cannot forward-reach to other components
-prop_Scc_NotConnected (G g) =
-  whenFail (print cs) $
-    -- every vertex is somewhere
-    and [ or [ x `elem` c | c <- cs ]
-        | x <- vertices g
-        ] &&
-    -- cannot foward-reach
-    and [ y `S.notMember` rx
-        | (c,d) <- pairs cs
-        , x <- c
-        , let rx = reach x
-        , y <- d
-        ]
- where
-  cs = sccs g
-
-  pairs (x:xs) = [ (x,y) | y <- xs ] ++ pairs xs
-  pairs []     = []
-
-  reach x = go S.empty [x]
-   where
-    go seen []            = seen
-    go seen (x:xs)
-      | x `S.member` seen = go seen xs
-      | otherwise         = go (S.insert x seen) ((g!x) ++ xs)
--}
-
---------------------------------------------------------------------------------
-