--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/pas2c/unitCycles.hs	Mon Nov 05 01:35:54 2012 +0100
@@ -0,0 +1,46 @@
+module Main where
+
+import PascalParser
+import System
+import Control.Monad
+import Data.Either
+import Data.List
+import Data.Graph
+import Data.Maybe
+
+unident :: Identificator -> String
+unident (Identificator s) = s
+
+extractUnits :: PascalUnit -> (String, [String])
+extractUnits (Program (Identificator name) (Implementation (Uses idents) _ _) _) = ("program " ++ name, map unident idents)
+extractUnits (Unit (Identificator name) (Interface (Uses idents1) _) (Implementation (Uses idents2) _ _) _ _) = (name, map unident $ idents1 ++ idents2)
+
+f :: [(String, [String])] -> String
+f = unlines . map showSCC . stronglyConnComp . map (\(a, b) -> (a, a, b))
+    where
+    showSCC (AcyclicSCC v) = v
+    showSCC (CyclicSCC vs) = intercalate ", " vs
+
+myf :: [(String, [String])] -> String
+myf d = unlines . map (findCycle . fst) $ d
+    where
+    findCycle :: String -> String
+    findCycle searched = searched ++ ": " ++ (intercalate ", " $ fc searched [])
+        where
+        fc :: String -> [String] -> [String]
+        fc curSearch visited = let uses = curSearch `lookup` d; res = dropWhile null . map t $ fromJust uses in if isNothing uses || null res then [] else head res
+            where
+            t u =
+                if u == searched then
+                    [u]
+                    else
+                    if u `elem` visited then
+                        []
+                        else
+                        let chain = fc u (u:visited) in if null chain then [] else u:chain
+
+
+main = do
+    fileNames <- getArgs
+    files <- mapM readFile fileNames
+    putStrLn . myf . map extractUnits . rights . map parsePascalUnit $ files