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module Grasp.Interpreter (
grasp
) where
import System.Random
import Text.Read( readMaybe )
import Data.Graph.Inductive.Graph( Node, LNode, LEdge, (&) )
import qualified Data.Graph.Inductive.Graph as Graph
import Data.List
import Data.Maybe
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 = if (ips == []) then return () else execute g ips []
execute :: GraspProgram -> [IP] -> [IP] -> IO ()
execute g [] out = interpret g (reverse out)
execute g ([]:ips) out = execute g ips out
execute g (cur:rest) out = do
(g', cur') <-
case (snd . head $ cur) of
"set" -> setI g cur
"new" -> newI g cur
"del" -> delI g cur
"push" -> pushI g cur
"pop" -> popI g cur
"pick" -> pickI g cur
"call" -> callI g cur
"ret" -> retI g cur
"add" -> addI g cur
"mul" -> mulI g cur
"sub" -> subI g cur
"div" -> divI g cur
"mod" -> modI g cur
"getc" -> getcI g cur
"putc" -> putcI g cur
"gets" -> getsI g cur
"puts" -> putsI g cur
x | isInteger x -> implicitPushI g cur
x -> error ("Unknown instruction at " ++ (show x))
execute g' rest (cur':out)
isInteger :: String -> Bool
isInteger x =
let check = readMaybe x :: Maybe Int
in if (isJust check) then True else False
isFloat :: String -> Bool
isFloat x =
let check = readMaybe x :: Maybe Float
in if (isJust check) then True else False
reLabel :: GraspProgram -> Node -> String -> GraspProgram
reLabel g n s =
let (mc,d) = Graph.match n g
c = fromJust mc
c' = (\(w,x,y,z) -> (w,x,s,z)) $ c
in if (isNothing mc) then g else c' & d
getByLabel :: String -> [LEdge String] -> [LEdge String]
getByLabel name = filter (\(_,_,x) -> x == name)
targetLabels :: GraspProgram -> [LEdge String] -> [String]
targetLabels g = map (\(_,x,_) -> fromJust (Graph.lab g x))
targetNodes :: [LEdge String] -> [Node]
targetNodes = map (\(_,x,_) -> x)
targetLNodes :: GraspProgram -> [LEdge String] -> [LNode String]
targetLNodes g = map (\(_,x,_) -> (x, fromJust (Graph.lab g x)) )
updateIP :: IP -> [LNode String] -> IO IP
updateIP _ [] = return []
updateIP ip next =
getStdRandom (randomR (0,length next)) >>=
(\x -> return ((next !! x):(tail ip)) )
setI :: GraspProgram -> IP -> IO (GraspProgram, IP)
setI g ip = do
let edges = Graph.out g (fst . head $ ip)
inL = targetLabels g (getByLabel "in" edges)
outN = targetNodes (getByLabel "out" edges)
nextLN = targetLNodes g (getByLabel "next" edges)
g' <- case inL of
[] -> return g
_ -> (getStdRandom (randomR (0,length inL))) >>=
(\x -> return (foldl' (\g n -> reLabel g n (inL !! x)) g outN) )
ip' <- updateIP ip nextLN
return (g',ip')
newI :: GraspProgram -> IP -> IO (GraspProgram, IP)
newI g ip = do
let node = fst . head $ ip
edges = Graph.out g node
tailN = targetNodes (getByLabel "tail" edges)
headN = targetNodes (getByLabel "head" edges)
labelL = targetLabels g (getByLabel "label" edges)
g' <- case (tailN, headN, labelL) of
(x,_,_) | length x /= 1 -> error ("Instruction " ++ (show node) ++
" should only have one tail argument")
(_,y,_) | length y /= 1 -> error ("Instruction " ++ (show node) ++
" should only have one head argument")
(_,_,z) | length z /= 1 -> error ("Instruction " ++ (show node) ++
" should only have one label argument")
(_,_,z) | isFloat (head z) -> error ("Instruction " ++ (show node) ++
" should have non-numeric label argument")
(x,y,z) -> return (Graph.insEdge (head x, head y, head z) g)
ip' <- updateIP ip (targetLNodes g' (getByLabel "next" (Graph.out g' node)))
return (g',ip')
delI :: GraspProgram -> IP -> IO (GraspProgram, IP)
delI g ip = do
let node = fst . head $ ip
edges = Graph.out g node
tailN = targetNodes (getByLabel "tail" edges)
headN = targetNodes (getByLabel "head" edges)
labelL = targetLabels g (getByLabel "label" edges)
edgesToDel = filter (\(x,y,z) -> x `elem` tailN &&
(headN == [] || y `elem` headN) &&
(labelL == [] || z `elem` labelL)) (Graph.labEdges g)
g' = foldl' (\gr e -> Graph.delLEdge e gr) g edgesToDel
ip' <- updateIP ip (targetLNodes g' (getByLabel "next" (Graph.out g' node)))
return (g',ip')
pushI :: GraspProgram -> IP -> IO (GraspProgram, IP)
pushI g ip = return (g,ip)
popI :: GraspProgram -> IP -> IO (GraspProgram, IP)
popI g ip = return (g,ip)
pickI :: GraspProgram -> IP -> IO (GraspProgram, IP)
pickI g ip = return (g,ip)
callI :: GraspProgram -> IP -> IO (GraspProgram, IP)
callI g ip = return (g,ip)
retI :: GraspProgram -> IP -> IO (GraspProgram, IP)
retI g ip = return (g,ip)
addI :: GraspProgram -> IP -> IO (GraspProgram, IP)
addI g ip = return (g,ip)
mulI :: GraspProgram -> IP -> IO (GraspProgram, IP)
mulI g ip = return (g,ip)
subI :: GraspProgram -> IP -> IO (GraspProgram, IP)
subI g ip = return (g,ip)
divI :: GraspProgram -> IP -> IO (GraspProgram, IP)
divI g ip = return (g,ip)
modI :: GraspProgram -> IP -> IO (GraspProgram, IP)
modI g ip = return (g,ip)
getcI :: GraspProgram -> IP -> IO (GraspProgram, IP)
getcI g ip = return (g,ip)
putcI :: GraspProgram -> IP -> IO (GraspProgram, IP)
putcI g ip = return (g,ip)
getsI :: GraspProgram -> IP -> IO (GraspProgram, IP)
getsI g ip = return (g,ip)
putsI :: GraspProgram -> IP -> IO (GraspProgram, IP)
putsI g ip = return (g,ip)
implicitPushI :: GraspProgram -> IP -> IO (GraspProgram, IP)
implicitPushI g ip = return (g,ip)
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