{-# LANGUAGE DataKinds #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE KindSignatures #-}
{-# LANGUAGE ScopedTypeVariables #-}
module IGraph
( Graph(..)
, EdgeType(..)
, isDirected
, nNodes
, nodeLab
, nodes
, labNodes
, nEdges
, edgeLab
, edges
, labEdges
, hasEdge
, getNodes
, getEdgeByEid
, getEdgeLabByEid
, empty
, mkGraph
, fromLabeledEdges
, fromLabeledEdges'
, unsafeFreeze
, freeze
, unsafeThaw
, thaw
, neighbors
, pre
, suc
, nmap
, emap
, nfilter
, efilter
) where
import Conduit
import Control.Arrow ((&&&))
import Control.Monad (forM, forM_, liftM, replicateM, when)
import Control.Monad.Primitive
import Control.Monad.ST (runST)
import Data.Either (fromRight)
import Data.Hashable (Hashable)
import qualified Data.HashMap.Strict as M
import qualified Data.HashSet as S
import Data.List (sortBy)
import Data.Ord (comparing)
import Data.Serialize
import Data.Singletons (Sing, SingI (..), fromSing)
import Foreign (Ptr, castPtr)
import System.IO.Unsafe (unsafePerformIO)
import IGraph.Internal
import IGraph.Internal.Constants
import IGraph.Mutable (MGraph(..))
import qualified IGraph.Mutable as GM
import IGraph.Types
data Graph (d :: EdgeType) v e = Graph
{ _graph :: IGraph
, _labelToNode :: M.HashMap v [Node]
}
instance (SingI d, Serialize v, Serialize e, Hashable v, Eq v)
=> Serialize (Graph d v e) where
put gr = do
put $ fromSing (sing :: Sing d)
put $ nNodes gr
go (nodeLab gr) (nNodes gr) 0
put $ nEdges gr
go (\i -> (getEdgeByEid gr i, getEdgeLabByEid gr i)) (nEdges gr) 0
where
go f n i | i >= n = return ()
| otherwise = put (f i) >> go f n (i+1)
get = do
directed <- get
when (fromSing (sing :: Sing d) /= directed) $
error "Incorrect graph type"
nn <- get
nds <- replicateM nn get
ne <- get
es <- replicateM ne get
return $ mkGraph nds es
isDirected :: forall d v e. SingI d => Graph d v e -> Bool
isDirected _ = case fromSing (sing :: Sing d) of
D -> True
U -> False
{-# INLINE isDirected #-}
nNodes :: Graph d v e -> Int
nNodes = unsafePerformIO . igraphVcount . _graph
{-# INLINE nNodes #-}
nodes :: Graph d v e -> [Node]
nodes gr = [0 .. nNodes gr - 1]
{-# INLINE nodes #-}
labNodes :: Serialize v => Graph d v e -> [LNode v]
labNodes gr = map (\i -> (i, nodeLab gr i)) $ nodes gr
{-# INLINE labNodes #-}
nEdges :: Graph d v e -> Int
nEdges = unsafePerformIO . igraphEcount . _graph
{-# INLINE nEdges #-}
edges :: Graph d v e -> [Edge]
edges gr = map (getEdgeByEid gr) [0 .. nEdges gr - 1]
{-# INLINE edges #-}
labEdges :: Serialize e => Graph d v e -> [LEdge e]
labEdges gr = map (getEdgeByEid gr &&& getEdgeLabByEid gr) [0 .. nEdges gr - 1]
{-# INLINE labEdges #-}
hasEdge :: Graph d v e -> Edge -> Bool
hasEdge gr (fr, to) = unsafePerformIO $ do
i <- igraphGetEid (_graph gr) fr to True False
return $ i >= 0
{-# INLINE hasEdge #-}
nodeLab :: Serialize v => Graph d v e -> Node -> v
nodeLab gr i = unsafePerformIO $
igraphHaskellAttributeVAS (_graph gr) vertexAttr i >>= toByteString >>=
return . fromRight (error "decode failed") . decode
{-# INLINE nodeLab #-}
getNodes :: (Hashable v, Eq v) => Graph d v e -> v -> [Node]
getNodes gr x = M.lookupDefault [] x $ _labelToNode gr
{-# INLINE getNodes #-}
edgeLab :: Serialize e => Graph d v e -> Edge -> e
edgeLab (Graph g _) (fr,to) = unsafePerformIO $
igraphGetEid g fr to True True >>=
igraphHaskellAttributeEAS g edgeAttr >>= toByteString >>=
return . fromRight (error "decode failed") . decode
{-# INLINE edgeLab #-}
getEdgeByEid :: Graph d v e -> Int -> Edge
getEdgeByEid (Graph g _) i = unsafePerformIO $ igraphEdge g i
{-# INLINE getEdgeByEid #-}
getEdgeLabByEid :: Serialize e => Graph d v e -> Int -> e
getEdgeLabByEid (Graph g _) i = unsafePerformIO $
igraphHaskellAttributeEAS g edgeAttr i >>= toByteString >>=
return . fromRight (error "decode failed") . decode
{-# INLINE getEdgeLabByEid #-}
empty :: (SingI d, Hashable v, Serialize v, Eq v, Serialize e)
=> Graph d v e
empty = runST $ GM.new 0 >>= unsafeFreeze
mkGraph :: (SingI d, Hashable v, Serialize v, Eq v, Serialize e)
=> [v]
-> [LEdge e]
-> Graph d v e
mkGraph vattr es = runST $ do
g <- GM.new 0
GM.addLNodes vattr g
GM.addLEdges es g
unsafeFreeze g
fromLabeledEdges :: (SingI d, Hashable v, Serialize v, Eq v, Serialize e)
=> [((v, v), e)] -> Graph d v e
fromLabeledEdges es = mkGraph labels es'
where
es' = flip map es $ \((fr, to), x) -> ((f fr, f to), x)
where f x = M.lookupDefault undefined x labelToId
labels = S.toList $ S.fromList $ concat [ [a,b] | ((a,b),_) <- es ]
labelToId = M.fromList $ zip labels [0..]
fromLabeledEdges' :: (MonadUnliftIO m, SingI d, Hashable v, Serialize v, Eq v, Serialize e)
=> a
-> (a -> ConduitT () ((v, v), e) m ())
-> m (Graph d v e)
fromLabeledEdges' input mkConduit = do
(labelToId, _, ne) <- runConduit $ mkConduit input .|
foldlC f (M.empty, 0::Int, 0::Int)
let action evec bsvec = do
let getId x = M.lookupDefault undefined x labelToId
runConduit $ mkConduit input .|
mapC (\((v1, v2), e) -> ((getId v1, getId v2), e)) .|
deserializeGraph (fst $ unzip $ sortBy (comparing snd) $ M.toList labelToId) evec bsvec
withRunInIO $ \runInIO -> allocaVectorN (2*ne) $ \evec ->
allocaBSVectorN ne $ \bsvec -> (runInIO $ action evec bsvec)
where
f (vs, nn, ne) ((v1, v2), _) =
let (vs', nn') = add v1 $ add v2 (vs, nn)
in (vs', nn', ne+1)
where
add v (m, i) = if v `M.member` m
then (m, i)
else (M.insert v i m, i + 1)
deserializeGraph :: (MonadIO m, SingI d, Hashable v, Serialize v, Eq v, Serialize e)
=> [v]
-> Ptr Vector
-> Ptr BSVector
-> ConduitT (LEdge e) o m (Graph d v e)
deserializeGraph nds evec bsvec = do
let f i ((fr, to), attr) = liftIO $ do
igraphVectorSet evec (i*2) $ fromIntegral fr
igraphVectorSet evec (i*2+1) $ fromIntegral to
bsvectorSet bsvec i $ encode attr
return $ i + 1
_ <- foldMC f 0
liftIO $ do
gr@(MGraph g) <- GM.new 0
GM.addLNodes nds gr
withBSAttr edgeAttr bsvec $ \ptr ->
withPtrs [ptr] (igraphAddEdges g evec . castPtr)
unsafeFreeze gr
{-# INLINE deserializeGraph #-}
freeze :: (Hashable v, Eq v, Serialize v, PrimMonad m)
=> MGraph (PrimState m) d v e -> m (Graph d v e)
freeze (MGraph g) = do
g' <- unsafePrimToPrim $ igraphCopy g
unsafeFreeze (MGraph g')
unsafeFreeze :: (Hashable v, Eq v, Serialize v, PrimMonad m)
=> MGraph (PrimState m) d v e -> m (Graph d v e)
unsafeFreeze (MGraph g) = unsafePrimToPrim $ do
nV <- igraphVcount g
labels <- forM [0 .. nV - 1] $ \i ->
igraphHaskellAttributeVAS g vertexAttr i >>= toByteString >>=
return . fromRight (error "decode failed") . decode
return $ Graph g $ M.fromListWith (++) $ zip labels $ map return [0..nV-1]
where
thaw :: PrimMonad m => Graph d v e -> m (MGraph (PrimState m) d v e)
thaw (Graph g _) = unsafePrimToPrim . liftM MGraph . igraphCopy $ g
unsafeThaw :: PrimMonad m => Graph d v e -> m (MGraph (PrimState m) d v e)
unsafeThaw (Graph g _) = return $ MGraph g
neighbors :: Graph d v e -> Node -> [Node]
neighbors gr i = unsafePerformIO $ withVerticesAdj i IgraphAll $ \vs ->
iterateVerticesC (_graph gr) vs $ \source -> runConduit $ source .| sinkList
suc :: Graph 'D v e -> Node -> [Node]
suc gr i = unsafePerformIO $ withVerticesAdj i IgraphOut $ \vs ->
iterateVerticesC (_graph gr) vs $ \source -> runConduit $ source .| sinkList
pre :: Graph 'D v e -> Node -> [Node]
pre gr i = unsafePerformIO $ withVerticesAdj i IgraphIn $ \vs ->
iterateVerticesC (_graph gr) vs $ \source -> runConduit $ source .| sinkList
nmap :: (Serialize v1, Serialize v2, Hashable v2, Eq v2)
=> (LNode v1 -> v2) -> Graph d v1 e -> Graph d v2 e
nmap f gr = runST $ do
(MGraph gptr) <- thaw gr
let gr' = MGraph gptr
forM_ (nodes gr) $ \x -> GM.setNodeAttr x (f (x, nodeLab gr x)) gr'
unsafeFreeze gr'
emap :: (Serialize e1, Serialize e2, Hashable v, Eq v, Serialize v)
=> (LEdge e1 -> e2) -> Graph d v e1 -> Graph d v e2
emap f gr = runST $ do
(MGraph gptr) <- thaw gr
let gr' = MGraph gptr
forM_ [0 .. nEdges gr - 1] $ \i -> do
let lab = f (getEdgeByEid gr i, getEdgeLabByEid gr i)
GM.setEdgeAttr i lab gr'
unsafeFreeze gr'
nfilter :: (Hashable v, Eq v, Serialize v)
=> (LNode v -> Bool) -> Graph d v e -> Graph d v e
nfilter f gr = runST $ do
let deleted = fst $ unzip $ filter (not . f) $ labNodes gr
gr' <- thaw gr
GM.delNodes deleted gr'
unsafeFreeze gr'
efilter :: (SingI d, Hashable v, Eq v, Serialize v, Serialize e)
=> (LEdge e -> Bool) -> Graph d v e -> Graph d v e
efilter f gr = runST $ do
let deleted = fst $ unzip $ filter (not . f) $ labEdges gr
gr' <- thaw gr
GM.delEdges deleted gr'
unsafeFreeze gr'