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module Grasp.Node (
GNode,
GNodeType,
singleton,
uSingleton,
fromStringList,
lab,
inst,
idNo
) where
import Data.Graph.Inductive.Graph( LNode )
import Data.Map( Map )
import qualified Data.Map as Map
type GNode = LNode (Maybe String, String)
type GNodeType = (Maybe String, String)
singleton :: Int -> String -> String -> GNode
singleton i m s = (i,(Just m,s))
uSingleton :: Int -> String -> GNode
uSingleton i s = (i,(Nothing,s))
fromStringList :: Map String Int -> [(String,String)] -> [GNode]
fromStringList m ns =
let change x = case (Map.lookup x m) of
Just a -> a
Nothing -> error "Grasp.Node.fromStringList: no value for key " ++ x
in map (\(x,y) -> (change x, (Just x, y))) ns
lab :: GNode -> Maybe String
lab (_,(x,_)) = x
inst :: GNode -> String
inst (_,(_,x)) = x
idNo :: GNode -> Int
idNo (x,(_,_)) = x
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