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{-
(c) The University of Glasgow 2006
(c) The AQUA Project, Glasgow University, 1994-1998
\section[FsSet]{Specialised sets, for things with @Uniques@}
Based on @FastStringEnvs@ (as you would expect).
Basically, the things need to be in class @Uniquable@.
-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE DeriveDataTypeable #-}
module FsSet (
-- * Unique set type
FsSet, -- type synonym for FastStringEnv a
getFsSet,
pprFsSet,
-- ** Manipulating these sets
emptyFsSet,
unitFsSet,
mkFsSet,
addOneToFsSet, addListToFsSet,
delOneFromFsSet, delListFromFsSet,
unionFsSets, unionManyFsSets,
minusFsSet, uniqSetMinusUFM,
intersectFsSets,
restrictFsSetToUFM,
uniqSetAny, uniqSetAll,
elementOfFsSet,
-- elemFsSet_Directly,
filterFsSet,
-- filterFsSet_Directly,
sizeFsSet,
isEmptyFsSet,
lookupFsSet,
lookupFsSet_Directly,
partitionFsSet,
-- mapFsSet,
unsafeUFMToFsSet,
nonDetEltsFsSet
) where
import GhcPrelude
import FastStringEnv
import Data.Coerce
import Outputable
import Data.Data
import FastString
import UniqMap
import qualified Data.Semigroup as Semi
-- Note [FsSet invariant]
-- ~~~~~~~~~~~~~~~~~~~~~~~~~
-- FsSet has the following invariant:
-- The keys in the map are the uniques of the values
-- It means that to implement mapFsSet you have to update
-- both the keys and the values.
newtype FsSet a = FsSet {getFsSet' :: FastStringEnv a}
deriving (Data, Semi.Semigroup, Monoid)
emptyFsSet :: FsSet a
emptyFsSet = FsSet emptyFsEnv
unitFsSet :: HasFastString a => a -> FsSet a
unitFsSet x = FsSet $ unitFsEnv x x
mkFsSet :: HasFastString a => [a] -> FsSet a
mkFsSet = foldl' addOneToFsSet emptyFsSet
addOneToFsSet :: HasFastString a => FsSet a -> a -> FsSet a
addOneToFsSet (FsSet set) x = FsSet (addToUniqMap set (coerce $ getFastString x) x)
addListToFsSet :: HasFastString a => FsSet a -> [a] -> FsSet a
addListToFsSet = foldl' addOneToFsSet
delOneFromFsSet :: HasFastString a => FsSet a -> a -> FsSet a
delOneFromFsSet (FsSet s) a = FsSet (delFromUniqMap s (coerce $ getFastString a))
--delOneFromFsSet_Directly :: FsSet a -> Unique -> FsSet a
--delOneFromFsSet_Directly (FsSet s) u = FsSet (delFromUFM_Directly s u)
delListFromFsSet :: HasFastString a => FsSet a -> [a] -> FsSet a
delListFromFsSet (FsSet s) l = FsSet (delListFromUniqMap s (coerce (map getFastString l)))
--delListFromFsSet_Directly :: FsSet a -> [Unique] -> FsSet a
--delListFromFsSet_Directly (FsSet s) l =
-- FsSet (delListFromUFM_Directly s l)
unionFsSets :: FsSet a -> FsSet a -> FsSet a
unionFsSets (FsSet s) (FsSet t) = FsSet (plusUniqMap s t)
unionManyFsSets :: [FsSet a] -> FsSet a
unionManyFsSets = foldl' (flip unionFsSets) emptyFsSet
minusFsSet :: FsSet a -> FsSet a -> FsSet a
minusFsSet (FsSet s) (FsSet t) = FsSet (minusUniqMap s t)
intersectFsSets :: FsSet a -> FsSet a -> FsSet a
intersectFsSets (FsSet s) (FsSet t) = FsSet (intersectUniqMap s t)
restrictFsSetToUFM :: FsSet a -> FastStringEnv b -> FsSet a
restrictFsSetToUFM (FsSet s) m = FsSet (intersectUniqMap s m)
uniqSetMinusUFM :: FsSet a -> FastStringEnv b -> FsSet a
uniqSetMinusUFM (FsSet s) t = FsSet (minusUniqMap s t)
elementOfFsSet :: HasFastString a => a -> FsSet a -> Bool
elementOfFsSet a (FsSet s) = elemUniqMap (coerce $ getFastString a) s
--elemFsSet_Directly :: FastStringU -> FsSet a -> Bool
--elemFsSet_Directly a (FsSet s) = elemUniq a s
filterFsSet :: (a -> Bool) -> FsSet a -> FsSet a
filterFsSet p (FsSet s) = FsSet (filterUniqMap p s)
--filterFsSet_Directly :: (Unique -> elt -> Bool) -> FsSet elt -> FsSet elt
--filterFsSet_Directly f (FsSet s) = FsSet (filterUniqMap f s)
partitionFsSet :: (a -> Bool) -> FsSet a -> (FsSet a, FsSet a)
partitionFsSet p (FsSet s) = coerce (partitionUniqMap p s)
uniqSetAny :: (a -> Bool) -> FsSet a -> Bool
uniqSetAny p (FsSet s) = anyUniqMap p s
uniqSetAll :: (a -> Bool) -> FsSet a -> Bool
uniqSetAll p (FsSet s) = allUniqMap p s
sizeFsSet :: FsSet a -> Int
sizeFsSet (FsSet s) = sizeUniqMap s
isEmptyFsSet :: FsSet a -> Bool
isEmptyFsSet (FsSet s) = isNullUniqMap s
lookupFsSet :: HasFastString a => FsSet b -> a -> Maybe b
lookupFsSet (FsSet s) k = lookupFsEnv s k
lookupFsSet_Directly :: FsSet a -> FastString -> Maybe a
lookupFsSet_Directly (FsSet s) k = lookupFsEnv s k
-- See Note [Deterministic FastStringEnv] to learn about nondeterminism.
-- If you use this please provide a justification why it doesn't introduce
-- nondeterminism.
nonDetEltsFsSet :: FsSet elt -> [elt]
nonDetEltsFsSet = nonDetEltsUniqMap . getFsSet'
{-
-- See Note [Deterministic FastStringEnv] to learn about nondeterminism.
-- If you use this please provide a justification why it doesn't introduce
-- nondeterminism.
nonDetKeysFsSet :: FsSet elt -> [Unique]
nonDetKeysFsSet = nonDetKeysUFM . getFsSet'
-- See Note [Deterministic FastStringEnv] to learn about nondeterminism.
-- If you use this please provide a justification why it doesn't introduce
-- nondeterminism.
nonDetFoldFsSet :: (elt -> a -> a) -> a -> FsSet elt -> a
nonDetFoldFsSet c n (FsSet s) = nonDetFoldUFM c n s
-}
{-
-- See Note [Deterministic FastStringEnv] to learn about nondeterminism.
-- If you use this please provide a justification why it doesn't introduce
-- nondeterminism.
nonDetFoldFsSet_Directly:: (Unique -> elt -> a -> a) -> a -> FsSet elt -> a
nonDetFoldFsSet_Directly f n (FsSet s) = nonDetFoldUFM_Directly f n s
-- See Note [FsSet invariant]
mapFsSet :: HasFastString b => (a -> b) -> FsSet a -> FsSet b
mapFsSet f = mkFsSet . map f . nonDetEltsFsSet
-}
getFsSet :: FsSet a -> FastStringEnv a
getFsSet = getFsSet'
-- | 'unsafeUFMToFsSet' converts a @'FastStringEnv' a@ into a @'FsSet' a@
-- assuming, without checking, that it maps each 'Unique' to a value
-- that has that 'Unique'. See Note [FsSet invariant].
unsafeUFMToFsSet :: FastStringEnv a -> FsSet a
unsafeUFMToFsSet = FsSet
instance Outputable a => Outputable (FsSet a) where
ppr = pprFsSet ppr
pprFsSet :: (a -> SDoc) -> FsSet a -> SDoc
-- It's OK to use nonDetUFMToList here because we only use it for
-- pretty-printing.
pprFsSet f (FsSet s) = pprUniqMap f s
|
