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module Grasp.Monad (
GraspM,
construct,
finalise,
getReadHandle,
getWriteHandle,
updateIP,
pushIP,
popIP,
peekIP,
nextIP,
nodesOut, edgesOut, edgesIn,
reLabel,
nodesWithName,
subGraph,
newNodes,
insNode, insNodes,
delNode, delNodes,
insEdge, insEdges,
delEdge, delEdges
) where
import System.IO( Handle, FilePath, IOMode )
import qualified System.IO as IO
import qualified System.Random as Random
import Control.Monad.Trans.State.Lazy( StateT )
import qualified Control.Monad.Trans.State.Lazy as State
import qualified Control.Monad as Monad
import Control.Monad.IO.Class( liftIO )
import qualified Data.Maybe as Maybe
import Data.List( (\\) )
import qualified Data.List as List
import Data.Map( Map )
import qualified Data.Map as Map
import Grasp.Graph( Node, LNode, LEdge, Gr, (&) )
import qualified Grasp.Graph as Graph
import Grasp.Types.IP( IP )
import qualified Grasp.Types.IP as IP
import Grasp.Types.GNode( GNode )
import qualified Grasp.Types.GNode as GN
import Grasp.Types.GEdge( GEdge )
import qualified Grasp.Types.GEdge as GE
import Grasp.Types.Instruction( Instruction )
import qualified Grasp.Types.Instruction as IN
import Grasp.Types.EdgeLabel( EdgeLabel )
import qualified Grasp.Types.EdgeLabel as EL
type GraspM a = StateT (Gr Instruction EdgeLabel, [IP], Map FilePath Handle) IO a
-- wrapping and unwrapping
construct :: ([GNode],[GEdge]) -> GraspM ()
construct (ns,es) = do
Monad.when (multiNodes ns) (error "node declared multiple times")
Monad.when (unconnected ns es) (error "unconnected edge")
Monad.when (multiNames ns es) (error "node with multiple names")
Monad.when (numericName ns es) (error "node with a numeric name")
Monad.when (noMain ns es) (error "could not find grasp:main")
let graph = Graph.mkGraph (map GN.toLNode ns) (map GE.toLEdge es)
ips = map (IP.singleton . GN.toNode) (getNodesWithName ns es "grasp:main")
handles = Map.empty
State.put (graph, ips, handles)
finalise :: GraspM () -> IO ([GNode],[GEdge])
finalise s = do
(gr, ips, fh) <- State.execStateT s (Graph.empty, [], Map.empty)
(mapM_ IO.hClose) . Map.elems $ fh
let (nodes, edges) = (Graph.labNodes gr, Graph.labEdges gr)
return (map GN.mk nodes, map GE.mk edges)
-- internally used functions
-- fix this later so it doesn't required unconnected edge checking first
nameNodeList :: [GNode] -> [GEdge] -> [(GNode,GNode)]
nameNodeList ns es =
let nameEdges = filter ((== (EL.mk "name")) . GE.toLabel) es
findNode n = Maybe.fromJust (List.find ((== n) . GN.toNode) ns)
in map (\x -> (findNode (GE.toSrc x), findNode (GE.toDest x))) nameEdges
getNodesWithName :: [GNode] -> [GEdge] -> String -> [GNode]
getNodesWithName ns es name =
(map fst) . (filter (\x -> (GN.toInst . snd $ x) == (IN.mk name))) $ (nameNodeList ns es)
getNamedNodes :: [GNode] -> [GEdge] -> [GNode]
getNamedNodes ns es = map fst (nameNodeList ns es)
-- error checking when setting up
multiNodes :: [GNode] -> Bool
multiNodes ns = (ns /= (List.nubBy (\x y -> GN.toNode x == GN.toNode y) ns))
unconnected :: [GNode] -> [GEdge] -> Bool
unconnected ns es =
let nodeList = map GN.toNode ns
unconnectedEdges = filter (\x -> GE.toSrc x `notElem` nodeList || GE.toDest x `notElem` nodeList) es
in unconnectedEdges /= []
multiNames :: [GNode] -> [GEdge] -> Bool
multiNames ns es =
let named = map fst (nameNodeList ns es)
in named /= (List.nub named)
numericName :: [GNode] -> [GEdge] -> Bool
numericName ns es =
let names = map snd (nameNodeList ns es)
in any (\x -> Maybe.isJust (IN.toFloat (GN.toInst x))) names
noMain :: [GNode] -> [GEdge] -> Bool
noMain ns es =
let names = map snd (nameNodeList ns es)
mains = filter ((== (IN.mk "grasp:main")) . GN.toInst) names
in length mains == 0
-- garbage collection
garbageCollect :: Gr Instruction EdgeLabel -> [IP] -> Gr Instruction EdgeLabel
garbageCollect gr ips =
let unreachable = (Graph.nodes gr) \\ (reachable gr ips)
in Graph.delNodes unreachable gr
reachable :: Gr Instruction EdgeLabel -> [IP] -> [Node]
reachable gr ips =
let named = getNamedNodes (map GN.mk (Graph.labNodes gr)) (map GE.mk (Graph.labEdges gr))
ipNodes = concatMap IP.toList ips
start = List.nub $ (map GN.toNode named) ++ ipNodes
in reach gr start []
reach :: Gr Instruction EdgeLabel -> [Node] -> [Node] -> [Node]
reach _ [] f = f
reach gr (x:xs) f =
let f' = List.nub (x:f)
x' = List.nub (xs ++ (Graph.suc gr x))
gr' = Graph.delNode x gr
in reach gr' x' f'
-- I/O
getWriteHandle :: FilePath -> GraspM Handle
getWriteHandle path = do
(gr, ips, fh) <- State.get
case (Map.lookup path fh) of
Nothing -> do
h <- liftIO (IO.openFile path IO.AppendMode)
State.put (gr, ips, (Map.insert path h fh))
return h
Just x -> do
w <- liftIO (IO.hIsWritable x)
if (not w) then do
liftIO (IO.hClose x)
h <- liftIO (IO.openFile path IO.AppendMode)
State.put (gr, ips, (Map.insert path h fh))
return h
else return x
getReadHandle :: FilePath -> GraspM Handle
getReadHandle path = do
(gr, ips, fh) <- State.get
case (Map.lookup path fh) of
Nothing -> do
h <- liftIO (IO.openFile path IO.ReadMode)
State.put (gr, ips, (Map.insert path h fh))
return h
Just x -> do
r <- liftIO (IO.hIsReadable x)
if (not r) then do
liftIO (IO.hClose x)
h <- liftIO (IO.openFile path IO.ReadMode)
State.put (gr, ips, (Map.insert path h fh))
return h
else return x
-- manipulating the instruction pointers
updateIP :: GraspM ()
updateIP = do
(gr, ips, fh) <- State.get
curNode <- peekIP
Monad.when (Maybe.isJust curNode) (do
nexts <- nodesOut (EL.mk "next") (Maybe.fromJust curNode)
r <- liftIO (Random.getStdRandom (Random.randomR (0, length nexts - 1)))
let updated = if (length nexts == 0) then IP.empty else IP.shift (GN.toNode (nexts !! r)) (head ips)
ips' = updated:(tail ips)
State.put (gr, ips', fh) )
pushIP :: GNode -> GraspM ()
pushIP n = do
(gr, ips, fh) <- State.get
let ips' = if (length ips == 0) then [] else (IP.push (GN.toNode n) (head ips)):(tail ips)
State.put (gr, ips', fh)
popIP :: GraspM ()
popIP = do
(gr, ips, fh) <- State.get
let ips' = if (length ips == 0) then [] else (IP.pop (head ips)):(tail ips)
State.put (gr, ips', fh)
peekIP :: GraspM (Maybe GNode)
peekIP = do
(gr, ips, fh) <- State.get
if (length ips == 0) then return Nothing
else return (do
node <- IP.peek (head ips)
label <- Graph.lab gr node
return (GN.mk (node, label)) )
nextIP :: GraspM ()
nextIP = do
(gr, ips, fh) <- State.get
let nonEmpties = filter (not . IP.isEmpty) ips
ips' = if (length nonEmpties == 0) then [] else (tail ips) ++ [head ips]
gr' = garbageCollect gr ips'
State.put (gr', ips', fh)
-- accessing and manipulating the graph
nodesOut :: EdgeLabel -> GNode -> GraspM [GNode]
nodesOut s n = do
(gr, ips, fh) <- State.get
let nout = Graph.lsuc gr (GN.toNode n)
filtered = filter ((== s) . snd) nout
result = map (\(x,y) -> GN.mk (x, Maybe.fromJust (Graph.lab gr x))) filtered
return result
edgesOut :: GNode -> GraspM [GEdge]
edgesOut n = do
(gr, ips, fh) <- State.get
let eout = Graph.out gr (GN.toNode n)
result = map GE.mk eout
return result
edgesIn :: GNode -> GraspM [GEdge]
edgesIn n = do
(gr, ips, fh) <- State.get
let ein = Graph.inn gr (GN.toNode n)
result = map GE.mk ein
return result
reLabel :: Instruction -> GNode -> GraspM ()
reLabel i n = do
(gr, ips, fh) <- State.get
let (mc, d) = Graph.match (GN.toNode n) gr
c = Maybe.fromJust mc
c' = (\(w,x,y,z) -> (w,x,i,z)) $ c
Monad.when (Maybe.isJust mc) (State.put ((c' & d) ,ips, fh))
nodesWithName :: Instruction -> GraspM [GNode]
nodesWithName x = do
(gr, ips, fh) <- State.get
let ns = map GN.mk (Graph.labNodes gr)
es = map GE.mk (Graph.labEdges gr)
return (getNodesWithName ns es (IN.toString x))
subGraph :: GNode -> GraspM ([GNode],[GEdge])
subGraph n = do
(gr, ips, fh) <- State.get
let rNodes = reach gr [GN.toNode n] []
rEdges = filter (\(x,y,z) -> x `elem` rNodes && y `elem` rNodes) (Graph.labEdges gr)
result = (map (\x -> GN.mk (x, Maybe.fromJust (Graph.lab gr x))) rNodes, map GE.mk rEdges)
return result
newNodes :: [Instruction] -> GraspM [GNode]
newNodes is = do
(gr, ips, fh) <- State.get
let newNs = Graph.newNodes (length is) gr
newGNs = map GN.mk (zip newNs is)
return newGNs
insNode :: GNode -> GraspM ()
insNode n = do
(gr, ips, fh) <- State.get
let gr' = Graph.insNode (GN.toLNode n) gr
State.put (gr', ips, fh)
insNodes :: [GNode] -> GraspM ()
insNodes ns = do
(gr, ips, fh) <- State.get
let gr' = Graph.insNodes (map GN.toLNode ns) gr
State.put (gr', ips, fh)
delNode :: GNode -> GraspM ()
delNode n = do
(gr, ips, fh) <- State.get
let gr' = Graph.delNode (GN.toNode n) gr
State.put (gr', ips, fh)
delNodes :: [GNode] -> GraspM ()
delNodes ns = do
(gr, ips, fh) <- State.get
let gr' = Graph.delNodes (map GN.toNode ns) gr
State.put (gr', ips, fh)
insEdge :: GEdge -> GraspM ()
insEdge e = do
(gr, ips, fh) <- State.get
let gr' = Graph.insEdge (GE.toLEdge e) gr
State.put (gr', ips, fh)
insEdges :: [GEdge] -> GraspM ()
insEdges es = do
(gr, ips, fh) <- State.get
let gr' = Graph.insEdges (map GE.toLEdge es) gr
State.put (gr', ips, fh)
delEdge :: GEdge -> GraspM ()
delEdge e = do
(gr, ips, fh) <- State.get
let gr' = Graph.delLEdge (GE.toLEdge e) gr
State.put (gr', ips, fh)
delEdges :: [GEdge] -> GraspM ()
delEdges es = do
(gr, ips, fh) <- State.get
let gr' = List.foldl' (flip Graph.delLEdge) gr (map GE.toLEdge es)
State.put (gr', ips, fh)
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