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{- |
Module : Text.Pandoc.Readers.Odt.Generic.SetMap
Copyright : Copyright (C) 2015 Martin Linnemann
License : GNU GPL, version 2 or above
Maintainer : Martin Linnemann <theCodingMarlin@googlemail.com>
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
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