generic-trie-0.3.1: src/Data/GenericTrie/Internal.hs
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE DefaultSignatures #-}
{-# LANGUAGE UndecidableInstances #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE Trustworthy #-} -- coerce
{-# LANGUAGE CPP #-} -- MProxy on ghc >= 8
#if MIN_VERSION_base(4,9,0)
{-# LANGUAGE DataKinds #-} -- Meta
#endif
-- | Unstable implementation details
module Data.GenericTrie.Internal
( TrieKey(..)
, Trie(..)
, OrdKey(..)
-- * Generic derivation implementation
, genericTrieNull
, genericTrieMap
, genericTrieTraverse
, genericTrieShowsPrec
, genericInsert
, genericLookup
, genericDelete
, genericMapMaybeWithKey
, genericSingleton
, genericEmpty
, genericFoldWithKey
, genericTraverseWithKey
, TrieRepDefault
, GTrieKey(..)
, GTrie(..)
) where
import Control.Applicative (Applicative, liftA2)
import Data.Char (chr, ord)
import Data.Coerce (coerce)
import Data.Foldable (Foldable)
import Data.IntMap (IntMap)
import Data.Map (Map)
import Data.Maybe (isNothing)
import Data.Traversable (Traversable,traverse)
import GHC.Generics
import qualified Data.Foldable as Foldable
import qualified Data.IntMap as IntMap
import qualified Data.Map as Map
import Prelude
-- | Types that may be used as the key of a 'Trie'.
--
-- For @data@ declarations, the instance can be automatically derived from
-- a 'Generic' instance.
class TrieKey k where
-- | Type of the representation of tries for this key.
type TrieRep k :: * -> *
-- | Construct an empty trie
trieEmpty :: Trie k a
-- | Test for an empty trie
trieNull :: Trie k a -> Bool
-- | Lookup element from trie
trieLookup :: k -> Trie k a -> Maybe a
-- | Insert element into trie
trieInsert :: k -> a -> Trie k a -> Trie k a
-- | Delete element from trie
trieDelete :: k -> Trie k a -> Trie k a
-- | Construct a trie holding a single value
trieSingleton :: k -> a -> Trie k a
-- | Apply a function to all values stored in a trie
trieMap :: (a -> b) -> Trie k a -> Trie k b
-- | Traverse the values stored in a trie
trieTraverse :: Applicative f => (a -> f b) -> Trie k a -> f (Trie k b)
-- | Show the representation of a trie
trieShowsPrec :: Show a => Int -> Trie k a -> ShowS
-- | Apply a function to the values of a 'Trie' and keep the elements
-- of the trie that result in a 'Just' value.
trieMapMaybeWithKey :: (k -> a -> Maybe b) -> Trie k a -> Trie k b
-- | Fold a trie with a function of both key and value.
trieFoldWithKey :: (k -> a -> r -> r) -> r -> Trie k a -> r
-- | Traverse a trie with a function of both key and value.
trieTraverseWithKey :: Applicative f => (k -> a -> f b) -> Trie k a -> f (Trie k b)
trieMergeWithKey :: (k -> a -> b -> Maybe c) ->
(Trie k a -> Trie k c) ->
(Trie k b -> Trie k c) ->
Trie k a -> Trie k b -> Trie k c
-- Defaults using 'Generic'
type instance TrieRep k = TrieRepDefault k
default trieEmpty :: ( TrieRep k ~ TrieRepDefault k) => Trie k a
trieEmpty = genericEmpty
default trieSingleton ::
( GTrieKey (Rep k), Generic k , TrieRep k ~ TrieRepDefault k) =>
k -> a -> Trie k a
trieSingleton = genericSingleton
default trieNull ::
( TrieRep k ~ TrieRepDefault k) =>
Trie k a -> Bool
trieNull = genericTrieNull
default trieLookup ::
( GTrieKey (Rep k), Generic k , TrieRep k ~ TrieRepDefault k) =>
k -> Trie k a -> Maybe a
trieLookup = genericLookup
default trieInsert ::
( GTrieKey (Rep k), Generic k , TrieRep k ~ TrieRepDefault k) =>
k -> a -> Trie k a -> Trie k a
trieInsert = genericInsert
default trieDelete ::
( GTrieKey (Rep k), Generic k , TrieRep k ~ TrieRepDefault k) =>
k -> Trie k a -> Trie k a
trieDelete = genericDelete
default trieMap ::
( GTrieKey (Rep k) , TrieRep k ~ TrieRepDefault k) =>
(a -> b) -> Trie k a -> Trie k b
trieMap = genericTrieMap
default trieTraverse ::
( GTrieKey (Rep k) , TrieRep k ~ TrieRepDefault k , Applicative f) =>
(a -> f b) -> Trie k a -> f (Trie k b)
trieTraverse = genericTrieTraverse
default trieShowsPrec ::
( Show a, GTrieKeyShow (Rep k) , TrieRep k ~ TrieRepDefault k) =>
Int -> Trie k a -> ShowS
trieShowsPrec = genericTrieShowsPrec
default trieMapMaybeWithKey ::
( GTrieKey (Rep k) , Generic k, TrieRep k ~ TrieRepDefault k) =>
(k -> a -> Maybe b) -> Trie k a -> Trie k b
trieMapMaybeWithKey = genericMapMaybeWithKey
default trieFoldWithKey ::
( GTrieKey (Rep k) , TrieRep k ~ TrieRepDefault k, Generic k) =>
(k -> a -> r -> r) -> r -> Trie k a -> r
trieFoldWithKey = genericFoldWithKey
default trieTraverseWithKey ::
( GTrieKey (Rep k) , TrieRep k ~ TrieRepDefault k, Generic k, Applicative f) =>
(k -> a -> f b) -> Trie k a -> f (Trie k b)
trieTraverseWithKey = genericTraverseWithKey
default trieMergeWithKey ::
( GTrieKey (Rep k) , TrieRep k ~ TrieRepDefault k, Generic k ) =>
(k -> a -> b -> Maybe c) ->
(Trie k a -> Trie k c) ->
(Trie k b -> Trie k c) ->
Trie k a -> Trie k b -> Trie k c
trieMergeWithKey = genericMergeWithKey
-- | A map from keys of type @k@, to values of type @a@.
newtype Trie k a = MkTrie (TrieRep k a)
------------------------------------------------------------------------------
-- Manually derived instances for base types
------------------------------------------------------------------------------
-- | 'Int' tries are implemented with 'IntMap'.
instance TrieKey Int where
type TrieRep Int = IntMap
trieLookup k (MkTrie x) = IntMap.lookup k x
trieInsert k v (MkTrie t) = MkTrie (IntMap.insert k v t)
trieDelete k (MkTrie t) = MkTrie (IntMap.delete k t)
trieEmpty = MkTrie IntMap.empty
trieSingleton k v = MkTrie (IntMap.singleton k v)
trieNull (MkTrie x) = IntMap.null x
trieMap f (MkTrie x) = MkTrie (IntMap.map f x)
trieTraverse f (MkTrie x) = fmap MkTrie (traverse f x)
trieShowsPrec p (MkTrie x) = showsPrec p x
trieMapMaybeWithKey f (MkTrie x) = MkTrie (IntMap.mapMaybeWithKey f x)
trieFoldWithKey f z (MkTrie x) = IntMap.foldrWithKey f z x
trieTraverseWithKey f (MkTrie x) = fmap MkTrie (IntMap.traverseWithKey f x)
trieMergeWithKey f g h (MkTrie x) (MkTrie y) = MkTrie (IntMap.mergeWithKey f (coerce g) (coerce h) x y)
{-# INLINABLE trieEmpty #-}
{-# INLINABLE trieInsert #-}
{-# INLINABLE trieLookup #-}
{-# INLINABLE trieDelete #-}
{-# INLINABLE trieSingleton #-}
{-# INLINABLE trieFoldWithKey #-}
{-# INLINABLE trieShowsPrec #-}
{-# INLINABLE trieTraverse #-}
{-# INLINABLE trieTraverseWithKey #-}
{-# INLINABLE trieNull #-}
{-# INLINABLE trieMap #-}
{-# INLINABLE trieMergeWithKey #-}
{-# INLINABLE trieMapMaybeWithKey #-}
-- | 'Integer' tries are implemented with 'Map'.
instance TrieKey Integer where
type TrieRep Integer = Map Integer
trieLookup k (MkTrie t) = Map.lookup k t
trieInsert k v (MkTrie t) = MkTrie (Map.insert k v t)
trieDelete k (MkTrie t) = MkTrie (Map.delete k t)
trieEmpty = MkTrie Map.empty
trieSingleton k v = MkTrie (Map.singleton k v)
trieNull (MkTrie x) = Map.null x
trieMap f (MkTrie x) = MkTrie (Map.map f x)
trieTraverse f (MkTrie x) = fmap MkTrie (traverse f x)
trieShowsPrec p (MkTrie x) = showsPrec p x
trieMapMaybeWithKey f (MkTrie x) = MkTrie (Map.mapMaybeWithKey f x)
trieFoldWithKey f z (MkTrie x) = Map.foldrWithKey f z x
trieTraverseWithKey f (MkTrie x) = fmap MkTrie (Map.traverseWithKey f x)
trieMergeWithKey f g h (MkTrie x) (MkTrie y) = MkTrie (Map.mergeWithKey f (coerce g) (coerce h) x y)
{-# INLINABLE trieEmpty #-}
{-# INLINABLE trieInsert #-}
{-# INLINABLE trieLookup #-}
{-# INLINABLE trieDelete #-}
{-# INLINABLE trieSingleton #-}
{-# INLINABLE trieFoldWithKey #-}
{-# INLINABLE trieShowsPrec #-}
{-# INLINABLE trieTraverse #-}
{-# INLINABLE trieTraverseWithKey #-}
{-# INLINABLE trieNull #-}
{-# INLINABLE trieMap #-}
{-# INLINABLE trieMergeWithKey #-}
{-# INLINABLE trieMapMaybeWithKey #-}
-- | 'Char' tries are implemented with 'IntMap'.
instance TrieKey Char where
type TrieRep Char = IntMap
trieLookup k (MkTrie t) = IntMap.lookup (ord k) t
trieDelete k (MkTrie t) = MkTrie (IntMap.delete (ord k) t)
trieInsert k v (MkTrie t) = MkTrie (IntMap.insert (ord k) v t)
trieEmpty = MkTrie IntMap.empty
trieSingleton k v = MkTrie (IntMap.singleton (ord k) v)
trieNull (MkTrie x) = IntMap.null x
trieMap f (MkTrie x) = MkTrie (IntMap.map f x)
trieTraverse f (MkTrie x) = fmap MkTrie (traverse f x)
trieShowsPrec p (MkTrie x) = showsPrec p x
trieMapMaybeWithKey f (MkTrie x) = MkTrie (IntMap.mapMaybeWithKey (f . chr) x)
trieFoldWithKey f z (MkTrie x) = IntMap.foldrWithKey (f . chr) z x
trieTraverseWithKey f (MkTrie x) = fmap MkTrie (IntMap.traverseWithKey (f . chr) x)
trieMergeWithKey f g h (MkTrie x) (MkTrie y) = MkTrie (IntMap.mergeWithKey (f . chr) (coerce g) (coerce h) x y)
{-# INLINABLE trieEmpty #-}
{-# INLINABLE trieInsert #-}
{-# INLINABLE trieLookup #-}
{-# INLINABLE trieDelete #-}
{-# INLINABLE trieSingleton #-}
{-# INLINABLE trieFoldWithKey #-}
{-# INLINABLE trieShowsPrec #-}
{-# INLINABLE trieTraverse #-}
{-# INLINABLE trieTraverseWithKey #-}
{-# INLINABLE trieNull #-}
{-# INLINABLE trieMap #-}
{-# INLINABLE trieMergeWithKey #-}
{-# INLINABLE trieMapMaybeWithKey #-}
-- | Tries indexed by 'OrdKey' will be represented as an ordinary 'Map'
-- and the keys will be compared based on the 'Ord' instance for @k@.
newtype OrdKey k = OrdKey { getOrdKey :: k }
deriving (Read, Show, Eq, Ord)
-- | 'OrdKey' tries are implemented with 'Map', this is
-- intended for cases where it is better for some reason
-- to force the use of a 'Map' than to use the generically
-- derived structure.
instance (Show k, Ord k) => TrieKey (OrdKey k) where
type TrieRep (OrdKey k) = Map k
trieLookup (OrdKey k) (MkTrie x) = Map.lookup k x
trieInsert (OrdKey k) v (MkTrie x) = MkTrie (Map.insert k v x)
trieDelete (OrdKey k) (MkTrie x) = MkTrie (Map.delete k x)
trieEmpty = MkTrie Map.empty
trieSingleton (OrdKey k) v = MkTrie (Map.singleton k v)
trieNull (MkTrie x) = Map.null x
trieMap f (MkTrie x) = MkTrie (Map.map f x)
trieTraverse f (MkTrie x) = fmap MkTrie (traverse f x)
trieShowsPrec p (MkTrie x) = showsPrec p x
trieMapMaybeWithKey f (MkTrie x) = MkTrie (Map.mapMaybeWithKey (f . OrdKey) x)
trieFoldWithKey f z (MkTrie x) = Map.foldrWithKey (f . OrdKey) z x
trieTraverseWithKey f (MkTrie x) = fmap MkTrie (Map.traverseWithKey (f . OrdKey) x)
trieMergeWithKey f g h (MkTrie x) (MkTrie y) = MkTrie (Map.mergeWithKey (f . OrdKey) (coerce g) (coerce h) x y)
{-# INLINABLE trieEmpty #-}
{-# INLINABLE trieInsert #-}
{-# INLINABLE trieLookup #-}
{-# INLINABLE trieDelete #-}
{-# INLINABLE trieSingleton #-}
{-# INLINABLE trieFoldWithKey #-}
{-# INLINABLE trieShowsPrec #-}
{-# INLINABLE trieTraverse #-}
{-# INLINABLE trieTraverseWithKey #-}
{-# INLINABLE trieNull #-}
{-# INLINABLE trieMap #-}
{-# INLINABLE trieMergeWithKey #-}
{-# INLINABLE trieMapMaybeWithKey #-}
------------------------------------------------------------------------------
-- Automatically derived instances for common types
------------------------------------------------------------------------------
instance TrieKey ()
instance TrieKey Bool
instance TrieKey k => TrieKey (Maybe k)
instance (TrieKey a, TrieKey b) => TrieKey (Either a b)
instance (TrieKey a, TrieKey b) => TrieKey (a,b)
instance (TrieKey a, TrieKey b, TrieKey c) => TrieKey (a,b,c)
instance (TrieKey a, TrieKey b, TrieKey c, TrieKey d) => TrieKey (a,b,c,d)
instance (TrieKey a, TrieKey b, TrieKey c, TrieKey d, TrieKey e) => TrieKey (a,b,c,d,e)
instance TrieKey k => TrieKey [k]
------------------------------------------------------------------------------
-- Generic 'TrieKey' method implementations
------------------------------------------------------------------------------
-- | Generic implementation of 'lookup'. This is the default implementation.
genericLookup ::
( GTrieKey (Rep k), Generic k
, TrieRep k ~ TrieRepDefault k
) =>
k -> Trie k a -> Maybe a
genericLookup k t = gtrieLookup (from k) =<< unwrap t
{-# INLINABLE genericLookup #-}
-- | Generic implementation of 'trieNull'. This is the default implementation.
genericTrieNull ::
( TrieRep k ~ TrieRepDefault k
) =>
Trie k a -> Bool
genericTrieNull = isNothing . unwrap
{-# INLINABLE genericTrieNull #-}
-- | Generic implementation of 'singleton'. This is the default implementation.
genericSingleton ::
( GTrieKey (Rep k), Generic k
, TrieRep k ~ TrieRepDefault k
) =>
k -> a -> Trie k a
genericSingleton k v = wrap $ Just $! gtrieSingleton (from k) v
{-# INLINABLE genericSingleton #-}
-- | Generic implementation of 'empty'. This is the default implementation.
genericEmpty ::
( TrieRep k ~ TrieRepDefault k
) =>
Trie k a
genericEmpty = MkTrie EmptyTrie
{-# INLINABLE genericEmpty #-}
-- | Generic implementation of 'insert'. This is the default implementation.
genericInsert ::
( GTrieKey (Rep k), Generic k
, TrieRep k ~ TrieRepDefault k
) =>
k -> a -> Trie k a -> Trie k a
genericInsert k v m = wrap $
case unwrap m of
Nothing -> Just $! gtrieSingleton (from k) v
Just t -> Just $! gtrieInsert (from k) v t
{-# INLINABLE genericInsert #-}
-- | Generic implementation of 'delete'. This is the default implementation.
genericDelete ::
( GTrieKey (Rep k), Generic k
, TrieRep k ~ TrieRepDefault k
) =>
k -> Trie k a -> Trie k a
genericDelete k m = wrap (gtrieDelete (from k) =<< unwrap m)
{-# INLINABLE genericDelete #-}
-- | Generic implementation of 'trieMap'. This is the default implementation.
genericTrieMap ::
( GTrieKey (Rep k)
, TrieRep k ~ TrieRepDefault k
) =>
(a -> b) -> Trie k a -> Trie k b
genericTrieMap f x = wrap (fmap (gtrieMap f) $! unwrap x)
{-# INLINABLE genericTrieMap #-}
-- | Generic implementation of 'trieTraverse'. This is the default implementation.
genericTrieTraverse ::
( GTrieKey (Rep k)
, TrieRep k ~ TrieRepDefault k
, Applicative f
) =>
(a -> f b) -> Trie k a -> f (Trie k b)
genericTrieTraverse f x =
fmap wrap (traverse (gtrieTraverse f) (unwrap x))
{-# INLINABLE genericTrieTraverse #-}
-- | Generic implementation of 'trieShowsPrec'. This is the default implementation.
genericTrieShowsPrec ::
( Show a, GTrieKeyShow (Rep k)
, TrieRep k ~ TrieRepDefault k
) =>
Int -> Trie k a -> ShowS
genericTrieShowsPrec p m =
case unwrap m of
Just x -> showsPrec p x
Nothing -> showString "()"
{-# INLINABLE genericTrieShowsPrec #-}
-- | Generic implementation of 'mapMaybe'. This is the default implementation.
genericMapMaybeWithKey ::
( GTrieKey (Rep k), Generic k
, TrieRep k ~ TrieRepDefault k
) =>
(k -> a -> Maybe b) -> Trie k a -> Trie k b
genericMapMaybeWithKey f x = wrap (gmapMaybeWithKey (f . to) =<< unwrap x)
{-# INLINABLE genericMapMaybeWithKey #-}
-- | Generic implementation of 'foldWithKey'. This is the default implementation.
genericFoldWithKey ::
( GTrieKey (Rep k), Generic k
, TrieRep k ~ TrieRepDefault k
) =>
(k -> a -> r -> r) -> r -> Trie k a -> r
genericFoldWithKey f z m =
case unwrap m of
Nothing -> z
Just x -> gfoldWithKey (f . to) z x
{-# INLINABLE genericFoldWithKey #-}
-- | Generic implementation of 'traverseWithKey'. This is the default implementation.
genericTraverseWithKey ::
( GTrieKey (Rep k), Generic k
, TrieRep k ~ TrieRepDefault k
, Applicative f
) =>
(k -> a -> f b) -> Trie k a -> f (Trie k b)
genericTraverseWithKey f m = fmap wrap (traverse (gtraverseWithKey (f . to)) (unwrap m))
{-# INLINABLE genericTraverseWithKey #-}
-- | Generic implementation of 'mergeWithKey'. This is the default implementation.
genericMergeWithKey ::
( GTrieKey (Rep k), Generic k
, TrieRep k ~ TrieRepDefault k
) =>
(k -> a -> b -> Maybe c) -> (Trie k a -> Trie k c) -> (Trie k b -> Trie k c) ->
Trie k a -> Trie k b -> Trie k c
genericMergeWithKey f g h (MkTrie x) (MkTrie y) =
case (x,y) of
(EmptyTrie, EmptyTrie) -> MkTrie EmptyTrie
(NonEmptyTrie{} , EmptyTrie) -> g (MkTrie x)
(EmptyTrie, NonEmptyTrie{} ) -> h (MkTrie y)
(NonEmptyTrie x', NonEmptyTrie y') -> wrap (gmergeWithKey (f . to) (aux g) (aux h) x' y')
where
aux k t = unwrap (k (MkTrie (NonEmptyTrie t)))
{-# INLINABLE genericMergeWithKey #-}
wrap :: TrieRep k ~ TrieRepDefault k1 => Maybe (GTrie (Rep k1) a) -> Trie k a
wrap Nothing = MkTrie EmptyTrie
wrap (Just t) = MkTrie (NonEmptyTrie t)
unwrap :: TrieRep t ~ TrieRepDefault t2 => Trie t t1 -> Maybe (GTrie (Rep t2) t1)
unwrap (MkTrie EmptyTrie) = Nothing
unwrap (MkTrie (NonEmptyTrie t)) = Just t
------------------------------------------------------------------------------
-- Generic implementation class
------------------------------------------------------------------------------
-- | The default implementation of a 'TrieRep' is 'GTrie' wrapped in
-- a 'Maybe'. This wrapping is due to the 'GTrie' being a non-empty
-- trie allowing all the of the "emptiness" to be represented at the
-- top level for any given generically implemented key.
data TrieRepDefault k a = EmptyTrie | NonEmptyTrie !(GTrie (Rep k) a)
-- | Mapping of generic representation of keys to trie structures.
data family GTrie (f :: * -> *) a
newtype instance GTrie (M1 i c f) a = MTrie (GTrie f a)
data instance GTrie (f :+: g) a = STrieL !(GTrie f a)
| STrieR !(GTrie g a)
| STrieB !(GTrie f a) !(GTrie g a)
newtype instance GTrie (f :*: g) a = PTrie (GTrie f (GTrie g a))
newtype instance GTrie (K1 i k) a = KTrie (Trie k a)
newtype instance GTrie U1 a = UTrie a
data instance GTrie V1 a
instance GTrieKey f => Functor (GTrie f) where
fmap = gtrieMap
-- | TrieKey operations on Generic representations used to provide
-- the default implementations of tries.
class GTrieKey f where
gtrieLookup :: f p -> GTrie f a -> Maybe a
gtrieInsert :: f p -> a -> GTrie f a -> GTrie f a
gtrieSingleton :: f p -> a -> GTrie f a
gtrieDelete :: f p -> GTrie f a -> Maybe (GTrie f a)
gtrieMap :: (a -> b) -> GTrie f a -> GTrie f b
gtrieTraverse :: Applicative m => (a -> m b) -> GTrie f a -> m (GTrie f b)
gmapMaybeWithKey :: (f p -> a -> Maybe b) -> GTrie f a -> Maybe (GTrie f b)
gfoldWithKey :: (f p -> a -> r -> r) -> r -> GTrie f a -> r
gtraverseWithKey :: Applicative m => (f p -> a -> m b) -> GTrie f a -> m (GTrie f b)
gmergeWithKey :: (f p -> a -> b -> Maybe c) ->
(GTrie f a -> Maybe (GTrie f c)) ->
(GTrie f b -> Maybe (GTrie f c)) ->
GTrie f a -> GTrie f b -> Maybe (GTrie f c)
-- | The 'GTrieKeyShow' class provides generic implementations
-- of 'showsPrec'. This class is separate due to its implementation
-- varying for different kinds of metadata.
class GTrieKeyShow f where
gtrieShowsPrec :: Show a => Int -> GTrie f a -> ShowS
------------------------------------------------------------------------------
-- Generic implementation for metadata
------------------------------------------------------------------------------
-- | Generic metadata is skipped in trie representation and operations.
instance GTrieKey f => GTrieKey (M1 i c f) where
gtrieLookup (M1 k) (MTrie x) = gtrieLookup k x
gtrieInsert (M1 k) v (MTrie t)= MTrie (gtrieInsert k v t)
gtrieSingleton (M1 k) v = MTrie (gtrieSingleton k v)
gtrieDelete (M1 k) (MTrie x) = fmap MTrie (gtrieDelete k x)
gtrieMap f (MTrie x) = MTrie (gtrieMap f x)
gtrieTraverse f (MTrie x) = fmap MTrie (gtrieTraverse f x)
gmapMaybeWithKey f (MTrie x) = fmap MTrie (gmapMaybeWithKey (f . M1) x)
gfoldWithKey f z (MTrie x) = gfoldWithKey (f . M1) z x
gtraverseWithKey f (MTrie x) = fmap MTrie (gtraverseWithKey (f . M1) x)
gmergeWithKey f g h (MTrie x) (MTrie y) = fmap MTrie (gmergeWithKey (f . M1) (coerce g) (coerce h) x y)
{-# INLINE gtrieLookup #-}
{-# INLINE gtrieInsert #-}
{-# INLINE gtrieSingleton #-}
{-# INLINE gtrieDelete #-}
{-# INLINE gtrieMap #-}
{-# INLINE gmapMaybeWithKey #-}
{-# INLINE gtrieTraverse #-}
{-# INLINE gfoldWithKey #-}
{-# INLINE gtraverseWithKey #-}
#if MIN_VERSION_base(4,9,0)
data MProxy (c :: Meta) (f :: * -> *) a = MProxy
#else
data MProxy (c :: *) (f :: * -> *) a = MProxy
#endif
instance GTrieKeyShow f => GTrieKeyShow (M1 D d f) where
gtrieShowsPrec p (MTrie x) = showsPrec p x
instance (Constructor c, GTrieKeyShow f) => GTrieKeyShow (M1 C c f) where
gtrieShowsPrec p (MTrie x) = showParen (p > 10)
$ showString "Con "
. shows (conName (MProxy :: MProxy c f ()))
. showString " "
. showsPrec 11 x
instance GTrieKeyShow f => GTrieKeyShow (M1 S s f) where
gtrieShowsPrec p (MTrie x) = showsPrec p x
------------------------------------------------------------------------------
-- Generic implementation for fields
------------------------------------------------------------------------------
checkNull :: TrieKey k => Trie k a -> Maybe (Trie k a)
checkNull x
| trieNull x = Nothing
| otherwise = Just x
-- | Generic fields are represented by tries of the field type.
instance TrieKey k => GTrieKey (K1 i k) where
gtrieLookup (K1 k) (KTrie x) = trieLookup k x
gtrieInsert (K1 k) v (KTrie t) = KTrie (trieInsert k v t)
gtrieSingleton (K1 k) v = KTrie (trieSingleton k v)
gtrieDelete (K1 k) (KTrie t) = fmap KTrie (checkNull (trieDelete k t))
gtrieMap f (KTrie x) = KTrie (trieMap f x)
gtrieTraverse f (KTrie x) = fmap KTrie (trieTraverse f x)
gmapMaybeWithKey f (KTrie x) = fmap KTrie (checkNull (trieMapMaybeWithKey (f . K1) x))
gfoldWithKey f z (KTrie x) = trieFoldWithKey (f . K1) z x
gtraverseWithKey f (KTrie x) = fmap KTrie (trieTraverseWithKey (f . K1) x)
gmergeWithKey f g h (KTrie x) (KTrie y) = fmap KTrie (checkNull (trieMergeWithKey (f . K1) g' h' x y))
where
g' t = case g (KTrie t) of
Just (KTrie t') -> t'
Nothing -> trieEmpty
h' t = case h (KTrie t) of
Just (KTrie t') -> t'
Nothing -> trieEmpty
{-# INLINE gtrieLookup #-}
{-# INLINE gtrieInsert #-}
{-# INLINE gtrieSingleton #-}
{-# INLINE gtrieDelete #-}
{-# INLINE gtrieMap #-}
{-# INLINE gtrieTraverse #-}
{-# INLINE gfoldWithKey #-}
{-# INLINE gtraverseWithKey #-}
{-# INLINE gmergeWithKey #-}
{-# INLINE gmapMaybeWithKey #-}
instance TrieKey k => GTrieKeyShow (K1 i k) where
gtrieShowsPrec p (KTrie x) = showsPrec p x
------------------------------------------------------------------------------
-- Generic implementation for products
------------------------------------------------------------------------------
-- | Generic products are represented by tries of tries.
instance (GTrieKey f, GTrieKey g) => GTrieKey (f :*: g) where
gtrieLookup (i :*: j) (PTrie x) = gtrieLookup j =<< gtrieLookup i x
gtrieInsert (i :*: j) v (PTrie t) = case gtrieLookup i t of
Nothing -> PTrie (gtrieInsert i (gtrieSingleton j v) t)
Just ti -> PTrie (gtrieInsert i (gtrieInsert j v ti) t)
gtrieDelete (i :*: j) (PTrie t) = case gtrieLookup i t of
Nothing -> Just (PTrie t)
Just ti -> case gtrieDelete j ti of
Nothing -> fmap PTrie $! gtrieDelete i t
Just tj -> Just $! PTrie (gtrieInsert i tj t)
gtrieSingleton (i :*: j) v = PTrie (gtrieSingleton i (gtrieSingleton j v))
gtrieMap f (PTrie x) = PTrie (gtrieMap (gtrieMap f) x)
gtrieTraverse f (PTrie x) = fmap PTrie (gtrieTraverse (gtrieTraverse f) x)
gmapMaybeWithKey f (PTrie x) = fmap PTrie (gmapMaybeWithKey (\i -> gmapMaybeWithKey (\j -> f (i:*:j))) x)
gfoldWithKey f z (PTrie x) = gfoldWithKey (\i m r -> gfoldWithKey (\j -> f (i:*:j)) r m) z x
gtraverseWithKey f (PTrie x) = fmap PTrie (gtraverseWithKey (\i ->
gtraverseWithKey (\j -> f (i :*: j))) x)
gmergeWithKey f g h (PTrie x) (PTrie y) =
fmap PTrie $!
gmergeWithKey
(\i ->
gmergeWithKey
(\j -> f (i:*:j))
(g' i)
(h' i))
(coerce g)
(coerce h)
x
y
where
g' i t = do PTrie t' <- g (PTrie (gtrieSingleton i t))
gtrieLookup i t'
h' i t = do PTrie t' <- h (PTrie (gtrieSingleton i t))
gtrieLookup i t'
{-# INLINE gtrieLookup #-}
{-# INLINE gtrieInsert #-}
{-# INLINE gtrieDelete #-}
{-# INLINE gtrieSingleton #-}
{-# INLINE gtrieMap #-}
{-# INLINE gtrieTraverse #-}
{-# INLINE gfoldWithKey #-}
{-# INLINE gtraverseWithKey #-}
{-# INLINE gmergeWithKey #-}
{-# INLINE gmapMaybeWithKey #-}
instance (GTrieKeyShow f, GTrieKeyShow g) => GTrieKeyShow (f :*: g) where
gtrieShowsPrec p (PTrie x) = showsPrec p x
------------------------------------------------------------------------------
-- Generic implementation for sums
------------------------------------------------------------------------------
-- | Generic sums are represented by up to a pair of sub-tries.
instance (GTrieKey f, GTrieKey g) => GTrieKey (f :+: g) where
gtrieLookup (L1 k) (STrieL x) = gtrieLookup k x
gtrieLookup (L1 k) (STrieB x _) = gtrieLookup k x
gtrieLookup (R1 k) (STrieR y) = gtrieLookup k y
gtrieLookup (R1 k) (STrieB _ y) = gtrieLookup k y
gtrieLookup _ _ = Nothing
gtrieInsert (L1 k) v (STrieL x) = STrieL (gtrieInsert k v x)
gtrieInsert (L1 k) v (STrieR y) = STrieB (gtrieSingleton k v) y
gtrieInsert (L1 k) v (STrieB x y) = STrieB (gtrieInsert k v x) y
gtrieInsert (R1 k) v (STrieL x) = STrieB x (gtrieSingleton k v)
gtrieInsert (R1 k) v (STrieR y) = STrieR (gtrieInsert k v y)
gtrieInsert (R1 k) v (STrieB x y) = STrieB x (gtrieInsert k v y)
gtrieSingleton (L1 k) v = STrieL (gtrieSingleton k v)
gtrieSingleton (R1 k) v = STrieR (gtrieSingleton k v)
gtrieDelete (L1 k) (STrieL x) = fmap STrieL $! gtrieDelete k x
gtrieDelete (L1 _) (STrieR y) = Just $! STrieR y
gtrieDelete (L1 k) (STrieB x y) = case gtrieDelete k x of
Nothing -> Just $! STrieR y
Just x' -> Just $! STrieB x' y
gtrieDelete (R1 _) (STrieL x) = Just $! STrieL x
gtrieDelete (R1 k) (STrieR y) = fmap STrieR $! gtrieDelete k y
gtrieDelete (R1 k) (STrieB x y) = case gtrieDelete k y of
Nothing -> Just $! STrieL x
Just y' -> Just $! STrieB x y'
gtrieMap f (STrieB x y) = STrieB (gtrieMap f x) (gtrieMap f y)
gtrieMap f (STrieL x) = STrieL (gtrieMap f x)
gtrieMap f (STrieR y) = STrieR (gtrieMap f y)
gtrieTraverse f (STrieB x y) = liftA2 STrieB (gtrieTraverse f x) (gtrieTraverse f y)
gtrieTraverse f (STrieL x) = fmap STrieL (gtrieTraverse f x)
gtrieTraverse f (STrieR y) = fmap STrieR (gtrieTraverse f y)
gmapMaybeWithKey f (STrieL x) = fmap STrieL $! gmapMaybeWithKey (f . L1) x
gmapMaybeWithKey f (STrieR y) = fmap STrieR $! gmapMaybeWithKey (f . R1) y
gmapMaybeWithKey f (STrieB x y) = case (gmapMaybeWithKey (f . L1) x, gmapMaybeWithKey (f . R1) y) of
(Nothing, Nothing) -> Nothing
(Just x', Nothing) -> Just $! STrieL x'
(Nothing, Just y') -> Just $! STrieR y'
(Just x', Just y') -> Just $! STrieB x' y'
gfoldWithKey f z (STrieL x) = gfoldWithKey (f . L1) z x
gfoldWithKey f z (STrieR y) = gfoldWithKey (f . R1) z y
gfoldWithKey f z (STrieB x y) = gfoldWithKey (f . L1) (gfoldWithKey (f . R1) z y) x
gtraverseWithKey f (STrieL x) = fmap STrieL (gtraverseWithKey (f . L1) x)
gtraverseWithKey f (STrieR y) = fmap STrieR (gtraverseWithKey (f . R1) y)
gtraverseWithKey f (STrieB x y) = liftA2 STrieB (gtraverseWithKey (f . L1) x)
(gtraverseWithKey (f . R1) y)
gmergeWithKey f g h x0 y0 =
case (split x0, split y0) of
((xl,xr),(yl,yr)) -> build (mergel xl yl) (merger xr yr)
where
split (STrieL x) = (Just x, Nothing)
split (STrieR y) = (Nothing, Just y)
split (STrieB x y) = (Just x, Just y)
build (Just x) (Just y) = Just (STrieB x y)
build (Just x) Nothing = Just (STrieL x)
build Nothing (Just y) = Just (STrieR y)
build Nothing Nothing = Nothing
mergel Nothing Nothing = Nothing
mergel (Just x) Nothing = gl x
mergel Nothing (Just y) = hl y
mergel (Just x) (Just y) = gmergeWithKey (f . L1) gl hl x y
merger Nothing Nothing = Nothing
merger (Just x) Nothing = gr x
merger Nothing (Just y) = hr y
merger (Just x) (Just y) = gmergeWithKey (f . R1) gr hr x y
gl t = do STrieL t' <- g (STrieL t)
return t'
gr t = do STrieR t' <- g (STrieR t)
return t'
hl t = do STrieL t' <- h (STrieL t)
return t'
hr t = do STrieR t' <- h (STrieR t)
return t'
{-# INLINE gtrieLookup #-}
{-# INLINE gtrieInsert #-}
{-# INLINE gtrieDelete #-}
{-# INLINE gtrieSingleton #-}
{-# INLINE gtrieTraverse #-}
{-# INLINE gtrieMap #-}
{-# INLINE gfoldWithKey #-}
{-# INLINE gtraverseWithKey #-}
{-# INLINE gmergeWithKey #-}
{-# INLINE gmapMaybeWithKey #-}
instance (GTrieKeyShow f, GTrieKeyShow g) => GTrieKeyShow (f :+: g) where
gtrieShowsPrec p (STrieB x y) = showParen (p > 10)
$ showString "STrieB "
. showsPrec 11 x
. showString " "
. showsPrec 11 y
gtrieShowsPrec p (STrieL x) = showParen (p > 10)
$ showString "STrieL "
. showsPrec 11 x
gtrieShowsPrec p (STrieR y) = showParen (p > 10)
$ showString "STrieR "
. showsPrec 11 y
------------------------------------------------------------------------------
-- Generic implementation for units
------------------------------------------------------------------------------
-- | Tries of constructors without fields are represented by a single value.
instance GTrieKey U1 where
gtrieLookup _ (UTrie x) = Just x
gtrieInsert _ v _ = UTrie v
gtrieDelete _ _ = Nothing
gtrieSingleton _ = UTrie
gtrieMap f (UTrie x) = UTrie (f x)
gtrieTraverse f (UTrie x) = fmap UTrie (f x)
gmapMaybeWithKey f (UTrie x) = fmap UTrie $! f U1 x
gfoldWithKey f z (UTrie x) = f U1 x z
gtraverseWithKey f (UTrie x) = fmap UTrie (f U1 x)
gmergeWithKey f _ _ (UTrie x) (UTrie y) = fmap UTrie $! f U1 x y
{-# INLINE gtrieLookup #-}
{-# INLINE gtrieInsert #-}
{-# INLINE gtrieDelete #-}
{-# INLINE gtrieSingleton #-}
{-# INLINE gtrieTraverse #-}
{-# INLINE gtrieMap #-}
{-# INLINE gfoldWithKey #-}
{-# INLINE gtraverseWithKey #-}
{-# INLINE gmergeWithKey #-}
{-# INLINE gmapMaybeWithKey #-}
instance GTrieKeyShow U1 where
gtrieShowsPrec p (UTrie x) = showsPrec p x
------------------------------------------------------------------------------
-- Generic implementation for empty types
------------------------------------------------------------------------------
-- | Tries of types without constructors are represented by a unit.
instance GTrieKey V1 where
gtrieLookup k t = k `seq` t `seq` error "GTrieKey.V1: gtrieLookup"
gtrieInsert k _ t = k `seq` t `seq` error "GTrieKey.V1: gtrieInsert"
gtrieDelete k t = k `seq` t `seq` error "GTrieKey.V1: gtrieDelete"
gtrieSingleton k _ = k `seq` error "GTrieKey.V1: gtrieSingleton"
gtrieMap _ t = t `seq` error "GTrieKey.V1: gtrieMap"
gtrieTraverse _ t = t `seq` error "GTrieKey.V1: gtrieTraverse"
gmapMaybeWithKey _ t = t `seq` error "GTrieKey.V1: gmapMaybeWithKey"
gfoldWithKey _ _ t = t `seq` error "GTrieKey.V1: gmapFoldWithKey"
gtraverseWithKey _ t = t `seq` error "GTrieKey.V1: gtraverseWithKey"
gmergeWithKey _ _ _ t u = t `seq` u `seq` error "GTrieKey.V1: gmergeWithKey"
{-# INLINE gtrieLookup #-}
{-# INLINE gtrieInsert #-}
{-# INLINE gtrieDelete #-}
{-# INLINE gtrieSingleton #-}
{-# INLINE gtrieMap #-}
{-# INLINE gtrieTraverse #-}
{-# INLINE gfoldWithKey #-}
{-# INLINE gtraverseWithKey #-}
{-# INLINE gmergeWithKey #-}
{-# INLINE gmapMaybeWithKey #-}
instance GTrieKeyShow V1 where
gtrieShowsPrec _ _ = showString "()"
------------------------------------------------------------------------------
-- Various instances for Trie
------------------------------------------------------------------------------
instance (Show a, TrieKey k) => Show (Trie k a) where
showsPrec = trieShowsPrec
instance (Show a, GTrieKeyShow f) => Show (GTrie f a) where
showsPrec = gtrieShowsPrec
instance TrieKey k => Functor (Trie k) where
fmap = trieMap
instance TrieKey k => Foldable (Trie k) where
foldr f = trieFoldWithKey (\_ -> f)
instance TrieKey k => Traversable (Trie k) where
traverse = trieTraverse