87 lines
2.5 KiB
Haskell
87 lines
2.5 KiB
Haskell
{-# OPTIONS_GHC -Wno-unused-imports #-}
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{-# OPTIONS_GHC -fno-warn-orphans #-}
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{- |
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WARNING: orphan instances concerning Aeson classes and Data.Strict.IntMap datatypes have been introduced.
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The warnings have been disabled.
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-}
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module IntMapHelp
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-- ( module Data.Strict.IntMap
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(
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module Data.IntMap.Strict,
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newKey,
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insertNewKey,
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insertWithNewKeys,
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unsafeSwapKeys,
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safeSwapKeys,
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findIndex,
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) where
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import Data.Aeson
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import Data.IntMap.Strict
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import GHC.Generics
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import LensHelp
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--import Data.Strict.IntMap
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--import Data.Strict.Containers.Lens
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--import qualified Data.Strict.IntMap as IM
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--import qualified Data.Strict.IntMap.Autogen.Strict as IM
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--deriving instance Generic (IntMap a)
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--instance ToJSON1 IntMap where
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-- liftToJSON t tol = liftToJSON to' tol' . toList
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-- where
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-- to' = liftToJSON2 toJSON toJSONList t tol
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-- tol' = liftToJSONList2 toJSON toJSONList t tol
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--
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-- liftToEncoding t tol = liftToEncoding to' tol' . toList
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-- where
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-- to' = liftToEncoding2 toEncoding toEncodingList t tol
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-- tol' = liftToEncodingList2 toEncoding toEncodingList t tol
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--
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--instance ToJSON a => ToJSON (IntMap a) where
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-- toJSON = toJSON1
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-- toEncoding = toEncoding1
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--instance FromJSON a => FromJSON (IntMap a) where
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-- parseJSON = fmap fromList . parseJSON
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--instance ToJSON a => ToJSON (IntMap a) where
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-- toEncoding = genericToEncoding defaultOptions
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{- | Find a key value one higher than any key in the map, or zero if the map is
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- empty
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-}
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newKey :: IntMap a -> Int
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newKey = maybe 0 ((+ 1) . fst) . lookupMax
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-- | Insert an element with some new key.
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insertNewKey :: a -> IntMap a -> IntMap a
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insertNewKey x m = case lookupMax m of
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Nothing -> singleton 0 x
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Just (k, _) -> insert (k + 1) x m
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-- | Insert a list of values with new keys
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insertWithNewKeys :: [a] -> IntMap a -> IntMap a
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insertWithNewKeys xs m = union m $ fromList $ zip [newKey m ..] xs
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-- | Swaps two keys. Unsafe: assumes both keys exist.
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unsafeSwapKeys :: Int -> Int -> IntMap a -> IntMap a
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unsafeSwapKeys i j m = insert i (m ! j) $ insert j (m ! i) m
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safeSwapKeys :: Int -> Int -> IntMap a -> IntMap a
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safeSwapKeys i j m =
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m
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& at i .~ (m ^? ix j)
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& at j .~ (m ^? ix i)
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-- ideally this should short circuit, I am not sure whether it does or not
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-- though
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findIndex :: (a -> Bool) -> IntMap a -> Maybe Int
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findIndex t = foldrWithKey f Nothing
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where
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f _ _ (Just k) = Just k
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f k x _
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| t x = Just k
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| otherwise = Nothing
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