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+implementation module StdIOMonad
+
+//Deze module verpakt StdFile in een monadische jas
+
+import StdFile
+import StdMonad
+import StdMaybeMonad
+
+
+:: IO a = IO (*World Filehandle -> *(a, *World, Filehandle))
+:: Void       = Void
+:: Filemode   = Lees | Schrijf
+:: Filenaam :== String
+:: *Filehandle = None | FH *(Bool, Filemode, *File)
+
+toInt :: Filemode -> Int
+toInt Lees = FReadText
+toInt Schrijf = FWriteText
+
+Start world = read
+
+////voer monadische I/O actie uit op de wereld:
+//doIO :: (IO a) *World -> *(a,*World)
+//doIO (IO f) world = f (world, Closed)
+
+//  IO is een monad:
+instance return IO where
+	return x = IO (\w fh = (x, w, fh))
+//instance >>=    IO where
+//	(>>=) (IO f) g = IO(\w = let (a, w1) = f w in doIO (g a) w1)
+
+//lees regel van de console:
+read:: IO String
+read = IO (\w fh -> ("", w, fh))
+
+/*//schrijf regel naar de console:
+write:: String -> IO Void
+write s = IO (\w = (Void, write` s w))
+	where
+		write`:: String *World -> *World
+		write` s world
+		# (io, world) = stdio world
+		# io = fwrites s world
+		# (_, world) = fclose io
+		= world
+
+//open de file met gegeven filenaam en mode:
+open:: Filenaam Filemode -> IO (Maybe Filehandle)
+open s m = IO (\w = let (f1, w1) = openfh` s m w in (f1, (w1, f1)))
+	where
+		openfh`:: Filenaam Filemode *World -> (Maybe Filehandle, *World)
+		openfh` s m world
+		# (ok, file, world) = fopen s (toInt m) world
+		| ok = (Just (Open (m, file)), world)
+		| otherwise = (Nothing, world)
+
+//sluit de file met gegeven filenaam:
+close:: Filehandle -> IO Bool
+close fh = IO (\w = let (b1, w1) = close` fh w in (b1, (w1, Closed)))
+	where
+		close`:: Filehandle *World -> (Bool, *World)
+		close` Closed world = (False, world)
+		close` (Open (_, file)) world = fclose file world
+
+//bepaal of het lezen van de file klaar is:
+eof:: Filehandle -> IO Bool
+eof fh = IO (\w = let (b1, w1) = eof` fh w in (b1, (w1, Closed)))
+	where
+		eof`:: Filehandle *World -> (Bool, *World)
+		eof` Closed world = (world, False)
+		eaf`(Open (_, file)) world = fclose file
+
+//lees een regel van een file:
+readline:: Filehandle -> IO (Maybe String)
+readline fh = IO (\w = let r1 = readline` fh w in r1)
+	where
+		readline`:: Filehandle *World -> (Maybe String, (*World, Filehandle))
+		readline` Closed world = (world, Nothing)
+		readline` (Open (Schrijf, _)) world = (world, Nothing)
+		readline` (Open (Lees, file)) world
+		# (line, file) = sfreadline file
+		= (Just line, (world, Open (Lees, file)))
+
+//schrijf een regel naar een file:
+writeline:: String Filehandle -> IO Bool
+writeline s fh = IO (\w = let r1 = writeline` s fh w in r1)
+	where
+		writeline`:: String Filehandle *World -> (Bool, (*World, Filehandle))
+		writeline` line Closed world = (False, (world, Closed))
+		writeline` line (Open (Lees, file)) world = (False, (world, (Open (Lees, file))))
+		writeline` line (Open (Schrijf, file)) world
+		# file = fwrites line file
+		= (True, (world, file))*/