Data.TypeRepMap.Internal

Internal API for TypeRepMap and operations on it. The functions here do not have any stability guarantees and can change between minor versions.

If you need to use this module for purposes other than tests, create an issue.

Documentation

data TypeRepMap (f :: k -> Type)

TypeRepMap is a heterogeneous data structure similar in its essence to Map with types as keys, where each value has the type of its key. In addition to that, each value is wrapped in an interpretation f.

Here is an example of using Maybe as an interpretation, with a comparison to Map:

 Map String (Maybe String)          TypeRepMap Maybe
---------------------------       ---------------------
 "Int"  -> Just "5"                 Int  -> Just 5
 "Bool" -> Just "True"              Bool -> Just True
 "Char" -> Nothing                  Char -> Nothing

The runtime representation of TypeRepMap is an array, not a tree. This makes lookup significantly more efficient.

Constructors

TypeRepMap

an unsafe constructor for TypeRepMap

Fields

• fingerprintAs :: !(PrimArray Word64)

  first components of key fingerprints

• fingerprintBs :: !(PrimArray Word64)

  second components of key fingerprints

• anys :: !(Array Any)

  values stored in the map

• keys :: !(Array Any)

  typerep keys

Instances

IsList (TypeRepMap f)

fromList . toList == 'id'

Creates TypeRepMap from a list of WrapTypeables.

>>> size $ fromList [WrapTypeable $ Identity True, WrapTypeable $ Identity 'a']
2

Defined in Data.TypeRepMap.Internal

Associated Types

type Item (TypeRepMap f) :: *

Methods

fromList :: [Item (TypeRepMap f)] -> TypeRepMap f

fromListN :: Int -> [Item (TypeRepMap f)] -> TypeRepMap f

toList :: TypeRepMap f -> [Item (TypeRepMap f)]

Show (TypeRepMap f)

Shows only Fingerprints.

Defined in Data.TypeRepMap.Internal

Methods

showsPrec :: Int -> TypeRepMap f -> ShowS

show :: TypeRepMap f -> String

showList :: [TypeRepMap f] -> ShowS

Semigroup (TypeRepMap f)

Uses union to combine TypeRepMaps.

Defined in Data.TypeRepMap.Internal

Methods

(<>) :: TypeRepMap f -> TypeRepMap f -> TypeRepMap f

sconcat :: NonEmpty (TypeRepMap f) -> TypeRepMap f

stimes :: Integral b => b -> TypeRepMap f -> TypeRepMap f

Monoid (TypeRepMap f)

Defined in Data.TypeRepMap.Internal

Methods

mempty :: TypeRepMap f

mappend :: TypeRepMap f -> TypeRepMap f -> TypeRepMap f

mconcat :: [TypeRepMap f] -> TypeRepMap f

type Item (TypeRepMap f)

Defined in Data.TypeRepMap.Internal

type Item (TypeRepMap f) = WrapTypeable f

toFingerprints :: TypeRepMap f -> [Fingerprint]

Returns the list of Fingerprints from TypeRepMap.

empty :: TypeRepMap f

A TypeRepMap with no values stored in it.

size empty == 0

member @a empty == False

one :: forall a f. Typeable a => f a -> TypeRepMap f

Construct a TypeRepMap with a single element.

size (one x) == 1

member @a (one (x :: f a)) == True

insert :: forall a f. Typeable a => f a -> TypeRepMap f -> TypeRepMap f

Insert a value into a TypeRepMap.

size (insert v tm) >= size tm

member @a (insert (x :: f a) tm) == True

type KindOf (a :: k) = k

delete :: forall a (f :: KindOf a -> Type). Typeable a => TypeRepMap f -> TypeRepMap f

Delete a value from a TypeRepMap.

size (delete @a tm) <= size tm

member @a (delete @a tm) == False

>>> tm = delete @Bool $ insert (Just True) $ one (Just 'a')
>>> size tm
1
>>> member @Bool tm
False
>>> member @Char tm
True

hoist :: (forall x. f x -> g x) -> TypeRepMap f -> TypeRepMap g

Map over the elements of a TypeRepMap.

>>> tm = insert (Identity True) $ one (Identity 'a')
>>> lookup @Bool tm
Just (Identity True)
>>> lookup @Char tm
Just (Identity 'a')
>>> tm2 = hoist ((:[]) . runIdentity) tm
>>> lookup @Bool tm2
Just [True]
>>> lookup @Char tm2
Just "a"

hoistA :: Applicative t => (forall x. f x -> t (g x)) -> TypeRepMap f -> t (TypeRepMap g)

hoistWithKey :: forall f g. (forall x. Typeable x => f x -> g x) -> TypeRepMap f -> TypeRepMap g

unionWith :: (forall x. f x -> f x -> f x) -> TypeRepMap f -> TypeRepMap f -> TypeRepMap f

The union of two TypeRepMaps using a combining function.

union :: TypeRepMap f -> TypeRepMap f -> TypeRepMap f

The (left-biased) union of two TypeRepMaps. It prefers the first map when duplicate keys are encountered, i.e. union == unionWith const.

member :: forall a (f :: KindOf a -> Type). Typeable a => TypeRepMap f -> Bool

Check if a value of the given type is present in a TypeRepMap.

>>> member @Char $ one (Identity 'a')
True
>>> member @Bool $ one (Identity 'a')
False

lookup :: forall a f. Typeable a => TypeRepMap f -> Maybe (f a)

Lookup a value of the given type in a TypeRepMap.

>>> x = lookup $ insert (Identity (11 :: Int)) empty
>>> x :: Maybe (Identity Int)
Just (Identity 11)
>>> x :: Maybe (Identity ())
Nothing

size :: TypeRepMap f -> Int

Get the amount of elements in a TypeRepMap.

cachedBinarySearch :: Fingerprint -> PrimArray Word64 -> PrimArray Word64 -> Maybe Int

Binary searched based on this article http://bannalia.blogspot.com/2015/06/cache-friendly-binary-search.html with modification for our two-vector search case.

toAny :: f a -> Any

fromAny :: Any -> f a

typeFp :: forall a. Typeable a => Fingerprint

toTriples :: TypeRepMap f -> [(Fingerprint, Any, Any)]

deleteByFst :: Eq a => a -> [(a, b, c)] -> [(a, b, c)]

nubByFst :: Eq a => [(a, b, c)] -> [(a, b, c)]

fst3 :: (a, b, c) -> a

data WrapTypeable f where

Existential wrapper around Typeable indexed by f type parameter. Useful for TypeRepMap structure creation form list of WrapTypeables.

Constructors

WrapTypeable :: Typeable a => f a -> WrapTypeable f

Instances

Show (WrapTypeable f)

Defined in Data.TypeRepMap.Internal

Methods

showsPrec :: Int -> WrapTypeable f -> ShowS

show :: WrapTypeable f -> String

showList :: [WrapTypeable f] -> ShowS

calcFp :: forall a. Typeable a => Fingerprint

fromTriples :: [(Fingerprint, Any, Any)] -> TypeRepMap f

fromSortedList :: forall a. [a] -> [a]