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|
{-# LANGUAGE UndecidableInstances #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE DeriveTraversable #-}
{-# LANGUAGE TupleSections #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE DeriveFunctor #-}
--------------------------------------------------------------------------------
module Xanthous.Data.EntityMap
( EntityMap
, _EntityMap
, EntityID
, emptyEntityMap
, insertAt
, insertAtReturningID
, fromEIDsAndPositioned
, toEIDsAndPositioned
, atPosition
, atPositionWithIDs
, positions
, lookup
, lookupWithPosition
, positionOf
-- , positionedEntities
, neighbors
, Deduplicate(..)
-- * debug
, byID
, byPosition
, lastID
) where
--------------------------------------------------------------------------------
import Xanthous.Prelude hiding (lookup)
import Xanthous.Data
( Position
, Positioned(..)
, positioned
, Neighbors(..)
, neighborPositions, position
)
import Xanthous.Data.VectorBag
import Xanthous.Orphans ()
import Xanthous.Util (EqEqProp(..))
--------------------------------------------------------------------------------
import Data.Monoid (Endo(..))
import Test.QuickCheck (Arbitrary(..), CoArbitrary, Function)
import Test.QuickCheck.Checkers (EqProp)
import Test.QuickCheck.Instances.UnorderedContainers ()
import Test.QuickCheck.Instances.Vector ()
import Text.Show (showString, showParen)
import Data.Aeson
--------------------------------------------------------------------------------
type EntityID = Word32
type NonNullSet a = NonNull (Set a)
data EntityMap a where
EntityMap ::
{ _byPosition :: Map Position (NonNullSet EntityID)
, _byID :: HashMap EntityID (Positioned a)
, _lastID :: EntityID
} -> EntityMap a
deriving stock (Functor, Foldable, Traversable, Generic)
deriving anyclass (NFData, CoArbitrary, Function)
deriving via (EqEqProp (EntityMap a)) instance (Eq a, Ord a) => EqProp (EntityMap a)
makeLenses ''EntityMap
instance ToJSON a => ToJSON (EntityMap a) where
toJSON = toJSON . toEIDsAndPositioned
instance FromJSON a => FromJSON (EntityMap a) where
parseJSON = fmap (fromEIDsAndPositioned @[_]) . parseJSON
byIDInvariantError :: forall a. a
byIDInvariantError = error $ "Invariant violation: All EntityIDs in byPosition "
<> "must point to entityIDs in byID"
instance (Ord a, Eq a) => Eq (EntityMap a) where
-- em₁ == em₂ = em₁ ^. _EntityMap == em₂ ^. _EntityMap
(==) = (==) `on` view (_EntityMap . to sort)
deriving stock instance (Ord a) => Ord (EntityMap a)
instance Show a => Show (EntityMap a) where
showsPrec pr em
= showParen (pr > 10)
$ showString
. ("fromEIDsAndPositioned " <>)
. show
. toEIDsAndPositioned
$ em
instance Arbitrary a => Arbitrary (EntityMap a) where
arbitrary = review _EntityMap <$> arbitrary
shrink em = review _EntityMap <$> shrink (em ^. _EntityMap)
type instance Index (EntityMap a) = EntityID
type instance IxValue (EntityMap a) = (Positioned a)
instance Ixed (EntityMap a) where ix eid = at eid . traverse
instance At (EntityMap a) where
at eid = lens (view $ byID . at eid) setter
where
setter :: EntityMap a -> Maybe (Positioned a) -> EntityMap a
setter m Nothing = fromMaybe m $ do
Positioned pos _ <- m ^. byID . at eid
pure $ m
& removeEIDAtPos pos
& byID . at eid .~ Nothing
setter m (Just pe@(Positioned pos _)) = m
& (case lookupWithPosition eid m of
Nothing -> id
Just (Positioned origPos _) -> removeEIDAtPos origPos
)
& byID . at eid ?~ pe
& byPosition . at pos %~ \case
Nothing -> Just $ opoint eid
Just es -> Just $ ninsertSet eid es
removeEIDAtPos pos =
byPosition . at pos %~ (>>= fromNullable . ndeleteSet eid)
instance Semigroup (EntityMap a) where
em₁ <> em₂ = alaf Endo foldMap (uncurry insertAt) (em₂ ^. _EntityMap) em₁
instance Monoid (EntityMap a) where
mempty = emptyEntityMap
instance FunctorWithIndex EntityID EntityMap
instance FoldableWithIndex EntityID EntityMap
instance TraversableWithIndex EntityID EntityMap where
itraverse = itraverseOf itraversed
type instance Element (EntityMap a) = a
instance MonoFoldable (EntityMap a)
emptyEntityMap :: EntityMap a
emptyEntityMap = EntityMap mempty mempty 0
newtype Deduplicate a = Deduplicate (EntityMap a)
deriving stock (Show, Traversable, Generic)
deriving newtype (Eq, Functor, Foldable, EqProp, Arbitrary)
instance Semigroup (Deduplicate a) where
(Deduplicate em₁) <> (Deduplicate em₂) =
let _byID = em₁ ^. byID <> em₂ ^. byID
_byPosition = mempty &~ do
ifor_ _byID $ \eid (Positioned pos _) ->
at pos %= \case
Just eids -> Just $ ninsertSet eid eids
Nothing -> Just $ opoint eid
_lastID = fromMaybe 1 $ maximumOf (ifolded . asIndex) _byID
in Deduplicate EntityMap{..}
--------------------------------------------------------------------------------
_EntityMap :: Iso' (EntityMap a) [(Position, a)]
_EntityMap = iso hither yon
where
hither :: EntityMap a -> [(Position, a)]
hither em = do
(pos, eids) <- em ^. byPosition . _Wrapped
eid <- toList eids
ent <- em ^.. byID . at eid . folded . positioned
pure (pos, ent)
yon :: [(Position, a)] -> EntityMap a
yon poses = alaf Endo foldMap (uncurry insertAt) poses emptyEntityMap
insertAtReturningID :: forall a. Position -> a -> EntityMap a -> (EntityID, EntityMap a)
insertAtReturningID pos e em =
let (eid, em') = em & lastID <+~ 1
in em'
& byID . at eid ?~ Positioned pos e
& byPosition . at pos %~ \case
Nothing -> Just $ opoint eid
Just es -> Just $ ninsertSet eid es
& (eid, )
insertAt :: forall a. Position -> a -> EntityMap a -> EntityMap a
insertAt pos e = snd . insertAtReturningID pos e
atPosition :: forall a. (Ord a, Show a) => Position -> Lens' (EntityMap a) (VectorBag a)
atPosition pos = lens getter setter
where
getter em =
let eids :: VectorBag EntityID
eids = maybe mempty (VectorBag . toVector . toNullable)
$ em ^. byPosition . at pos
in getEIDAssume em <$> eids
setter em Empty = em & byPosition . at pos .~ Nothing
setter em (sort -> entities) =
let origEIDs = maybe Empty toNullable $ em ^. byPosition . at pos
origEntitiesWithIDs =
sortOn snd $ toList origEIDs <&> \eid -> (eid, getEIDAssume em eid)
go alles₁@((eid, e₁) :< es₁) -- orig
(e₂ :< es₂) -- new
| e₁ == e₂
-- same, do nothing
= let (eids, lastEID, byID') = go es₁ es₂
in (insertSet eid eids, lastEID, byID')
| otherwise
-- e₂ is new, generate a new ID for it
= let (eids, lastEID, byID') = go alles₁ es₂
eid' = succ lastEID
in (insertSet eid' eids, eid', byID' & at eid' ?~ Positioned pos e₂)
go Empty Empty = (mempty, em ^. lastID, em ^. byID)
go orig Empty =
let byID' = foldr deleteMap (em ^. byID) $ map fst orig
in (mempty, em ^. lastID, byID')
go Empty (new :< news) =
let (eids, lastEID, byID') = go Empty news
eid' = succ lastEID
in (insertSet eid' eids, eid', byID' & at eid' ?~ Positioned pos new)
go _ _ = error "unreachable"
(eidsAtPosition, newLastID, newByID) = go origEntitiesWithIDs entities
in em & byPosition . at pos .~ fromNullable eidsAtPosition
& byID .~ newByID
& lastID .~ newLastID
getEIDAssume :: EntityMap a -> EntityID -> a
getEIDAssume em eid = fromMaybe byIDInvariantError
$ em ^? byID . ix eid . positioned
atPositionWithIDs :: Position -> EntityMap a -> Vector (EntityID, Positioned a)
atPositionWithIDs pos em =
let eids = maybe mempty (toVector . toNullable)
$ em ^. byPosition . at pos
in (id &&& Positioned pos . getEIDAssume em) <$> eids
fromEIDsAndPositioned
:: forall mono a. (MonoFoldable mono, Element mono ~ (EntityID, Positioned a))
=> mono
-> EntityMap a
fromEIDsAndPositioned eps = newLastID $ alaf Endo foldMap insert' eps mempty
where
insert' (eid, pe@(Positioned pos _))
= (byID . at eid ?~ pe)
. (byPosition . at pos %~ \case
Just eids -> Just $ ninsertSet eid eids
Nothing -> Just $ opoint eid
)
newLastID em = em & lastID
.~ fromMaybe 1
(maximumOf (ifolded . asIndex) (em ^. byID))
toEIDsAndPositioned :: EntityMap a -> [(EntityID, Positioned a)]
toEIDsAndPositioned = itoListOf $ byID . ifolded
positions :: EntityMap a -> [Position]
positions = toListOf $ byPosition . to keys . folded
lookupWithPosition :: EntityID -> EntityMap a -> Maybe (Positioned a)
lookupWithPosition eid = view $ byID . at eid
lookup :: EntityID -> EntityMap a -> Maybe a
lookup eid = fmap (view positioned) . lookupWithPosition eid
-- unlawful :(
-- positionedEntities :: IndexedTraversal EntityID (EntityMap a) (EntityMap b) (Positioned a) (Positioned b)
-- positionedEntities = byID . itraversed
neighbors :: (Ord a, Show a) => Position -> EntityMap a -> Neighbors (VectorBag a)
neighbors pos em = (\p -> view (atPosition p) em) <$> neighborPositions pos
-- | Traversal to the position of the entity with the given ID
positionOf :: EntityID -> Traversal' (EntityMap a) Position
positionOf eid = ix eid . position
--------------------------------------------------------------------------------
makeWrapped ''Deduplicate
|
