{-
Copyright (C) 2015 Martin Linnemann
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
{- |
Module : Text.Pandoc.Readers.Odt.Generic.SetMap
Copyright : Copyright (C) 2015 Martin Linnemann
License : GNU GPL, version 2 or above
Maintainer : Martin Linnemann
Stability : alpha
Portability : portable
A map of values to sets of values.
-}
module Text.Pandoc.Readers.Odt.Generic.SetMap where
import qualified Data.Map as M
import qualified Data.Set as S
type SetMap k v = M.Map k (S.Set v)
empty :: SetMap k v
empty = M.empty
fromList :: (Ord k, Ord v) => [(k,v)] -> SetMap k v
fromList = foldr (uncurry insert) empty
insert :: (Ord k, Ord v) => k -> v -> SetMap k v -> SetMap k v
insert key value setMap = M.insertWith S.union key (S.singleton value) setMap
union3 :: (Ord k) => SetMap k v -> SetMap k v -> SetMap k v -> SetMap k v
union3 sm1 sm2 sm3 = sm1 `M.union` sm2 `M.union` sm3