GF/src is now for 2.9, and the new sources are in src-3.0 - keep it this way until the release of GF 3

src-3.0/GF/Data/Map.hs

@@ -0,0 +1,61 @@
+----------------------------------------------------------------------
+-- |
+-- Module      : Map
+-- Maintainer  : Markus Forsberg
+-- Stability   : Stable
+-- Portability : Haskell 98
+--
+-- > CVS $Date: 2005/04/21 16:22:04 $ 
+-- > CVS $Author: bringert $
+-- > CVS $Revision: 1.6 $
+--
+-- (Description of the module)
+-----------------------------------------------------------------------------
+
+module GF.Data.Map (
+           Map,
+           empty,
+           isEmpty,	   
+	   (!), 
+	   (!+),
+	   (|->),   
+	   (|->+), 
+	   (<+>),   
+	   flatten
+	   ) where
+
+import GF.Data.RedBlack
+
+type Map key el = Tree key el
+
+infixl 6 |->
+infixl 6 |->+
+infixl 5 !
+infixl 5 !+
+infixl 4 <+>
+
+empty :: Map key el
+empty = emptyTree
+
+-- | lookup operator.
+(!) :: Ord key => Map key el -> key -> Maybe el
+(!) fm e = lookupTree e fm
+
+-- | lookupMany operator.
+(!+) :: Ord key => Map key el -> [key] -> [Maybe el]
+fm !+    []  = []
+fm !+ (e:es) = (lookupTree e fm): (fm !+ es)
+
+-- | insert operator.
+(|->) :: Ord key => (key,el) -> Map key el -> Map key el
+(x,y) |-> fm = insertTree (x,y) fm
+
+-- | insertMany operator.
+(|->+) :: Ord key => [(key,el)] -> Map key el -> Map key el
+[]         |->+ fm = fm
+((x,y):xs) |->+ fm = xs |->+ (insertTree (x,y) fm)
+
+-- | union operator.
+(<+>) :: Ord key => Map key el -> Map key el -> Map key el
+(<+>) fm1 fm2 =  xs |->+ fm2
+ where xs = flatten fm1