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module Grasp.Interpreter (
grasp
) where
import Data.Graph.Inductive.Graph( Node, LNode, LEdge, (&) )
import qualified Data.Graph.Inductive.Graph as Graph
import Data.List
import Grasp.Types
import Grasp.Parser
type IP = [LNode String]
grasp :: GraspProgram -> IO ()
grasp g =
let ips = map (:[]) (nodesWithName g "grasp:main")
in interpret g ips
reachable :: GraspProgram -> [IP] -> [Node]
reachable g ips =
let startNodes = nub . (map fst) $ (namedNodes g) ++ (concat ips)
in reach g startNodes []
reach :: GraspProgram -> [Node] -> [Node] -> [Node]
reach _ [] f = f
reach g s@(x:xs) f =
let f' = nub (x:f)
s' = nub (xs ++ (Graph.suc g x))
g' = Graph.delNode x g
in reach g' s' f'
garbageCollect :: GraspProgram -> [IP] -> GraspProgram
garbageCollect g ips =
let unreachable = (Graph.nodes g) \\ (reachable g ips)
in Graph.delNodes unreachable g
interpret :: GraspProgram -> [IP] -> IO ()
interpret g ips = return ()
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