1 files changed, 29 insertions, 0 deletions
diff --git a/compiler/utils/FiniteMap.hs b/compiler/utils/FiniteMap.hs
new file mode 100644
index 0000000000..dccfca10a9
--- /dev/null
+++ b/compiler/utils/FiniteMap.hs
@@ -0,0 +1,29 @@
+-- Some extra functions to extend Data.Map
+
+module FiniteMap (
+        insertList,
+        insertListWith,
+        deleteList,
+        foldRight, foldRightWithKey
+    ) where
+
+import Data.Map (Map)
+import qualified Data.Map as Map
+
+insertList :: Ord key => [(key,elt)] -> Map key elt -> Map key elt
+insertList xs m = foldl (\m (k, v) -> Map.insert k v m) m xs
+
+insertListWith :: Ord key
+               => (elt -> elt -> elt)
+               -> [(key,elt)]
+               -> Map key elt
+               -> Map key elt
+insertListWith f xs m0 = foldl (\m (k, v) -> Map.insertWith f k v m) m0 xs
+
+deleteList :: Ord key => [key] -> Map key elt -> Map key elt
+deleteList ks m = foldl (flip Map.delete) m ks
+
+foldRight        :: (elt -> a -> a) -> a -> Map key elt -> a
+foldRight        = Map.fold
+foldRightWithKey :: (key -> elt -> a -> a) -> a -> Map key elt -> a
+foldRightWithKey = Map.foldrWithKey