GHC.Core.RoughMap

RoughMap is an approximate finite map data structure keyed on [RoughMatchTc]. This is useful when keying maps on lists of Types (e.g. an instance head).

RoughMatchTc

data RoughMatchTc

Constructors

RM_KnownTc Name

RM_WildCard

Instances

Data RoughMatchTc

Defined in GHC.Core.RoughMap

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> RoughMatchTc -> c RoughMatchTc

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c RoughMatchTc

toConstr :: RoughMatchTc -> Constr

dataTypeOf :: RoughMatchTc -> DataType

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c RoughMatchTc)

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c RoughMatchTc)

gmapT :: (forall b. Data b => b -> b) -> RoughMatchTc -> RoughMatchTc

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> RoughMatchTc -> r

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> RoughMatchTc -> r

gmapQ :: (forall d. Data d => d -> u) -> RoughMatchTc -> [u]

gmapQi :: Int -> (forall d. Data d => d -> u) -> RoughMatchTc -> u

gmapM :: Monad m => (forall d. Data d => d -> m d) -> RoughMatchTc -> m RoughMatchTc

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> RoughMatchTc -> m RoughMatchTc

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> RoughMatchTc -> m RoughMatchTc

Outputable RoughMatchTc

Defined in GHC.Core.RoughMap

Methods

ppr :: RoughMatchTc -> SDoc

isRoughWildcard :: RoughMatchTc -> Bool

typeToRoughMatchTc :: Type -> RoughMatchTc

data RoughMatchLookupTc

Constructors

RML_KnownTc Name

The position only matches the specified KnownTc

RML_NoKnownTc

The position definitely doesn't match any KnownTc

RML_WildCard

The position can match anything

Instances

Data RoughMatchLookupTc

Defined in GHC.Core.RoughMap

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> RoughMatchLookupTc -> c RoughMatchLookupTc

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c RoughMatchLookupTc

toConstr :: RoughMatchLookupTc -> Constr

dataTypeOf :: RoughMatchLookupTc -> DataType

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c RoughMatchLookupTc)

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c RoughMatchLookupTc)

gmapT :: (forall b. Data b => b -> b) -> RoughMatchLookupTc -> RoughMatchLookupTc

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> RoughMatchLookupTc -> r

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> RoughMatchLookupTc -> r

gmapQ :: (forall d. Data d => d -> u) -> RoughMatchLookupTc -> [u]

gmapQi :: Int -> (forall d. Data d => d -> u) -> RoughMatchLookupTc -> u

gmapM :: Monad m => (forall d. Data d => d -> m d) -> RoughMatchLookupTc -> m RoughMatchLookupTc

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> RoughMatchLookupTc -> m RoughMatchLookupTc

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> RoughMatchLookupTc -> m RoughMatchLookupTc

Outputable RoughMatchLookupTc

Defined in GHC.Core.RoughMap

Methods

ppr :: RoughMatchLookupTc -> SDoc

typeToRoughMatchLookupTc :: Type -> RoughMatchLookupTc

roughMatchTcToLookup :: RoughMatchTc -> RoughMatchLookupTc

roughMatchTcs :: [Type] -> [RoughMatchTc]

roughMatchTcsLookup :: [Type] -> [RoughMatchLookupTc]

instanceCantMatch :: [RoughMatchTc] -> [RoughMatchTc] -> Bool

RoughMap

data RoughMap a

Trie of [RoughMatchTc]

• Examples* insert [OtherTc] 1 insert [OtherTc] 2 lookup [OtherTc] == [1,2]

Instances

Functor RoughMap

Defined in GHC.Core.RoughMap

Methods

fmap :: (a -> b) -> RoughMap a -> RoughMap b

(<$) :: a -> RoughMap b -> RoughMap a

Outputable a => Outputable (RoughMap a)

Defined in GHC.Core.RoughMap

Methods

ppr :: RoughMap a -> SDoc

emptyRM :: RoughMap a

lookupRM :: [RoughMatchLookupTc] -> RoughMap a -> [a]

Order of result is deterministic.

lookupRM' :: [RoughMatchLookupTc] -> RoughMap a -> (Bag a, [a])

N.B. Returns a Bag for matches, which allows us to avoid rebuilding all of the lists we find in rm_empty, which would otherwise be necessary due to ++ if we returned a list. We use a list for unifiers because the tail is computed lazily and we often only care about the first couple of potential unifiers. Constructing a bag forces the tail which performs much too much work.

See Note [Matching a RoughMap] See Note [Matches vs Unifiers]

insertRM :: [RoughMatchTc] -> a -> RoughMap a -> RoughMap a

filterRM :: (a -> Bool) -> RoughMap a -> RoughMap a

filterMatchingRM :: (a -> Bool) -> [RoughMatchTc] -> RoughMap a -> RoughMap a

Filter all elements that might match a particular key with the given predicate.

elemsRM :: RoughMap a -> [a]

sizeRM :: RoughMap a -> Int

foldRM :: (a -> b -> b) -> b -> RoughMap a -> b

unionRM :: RoughMap a -> RoughMap a -> RoughMap a