1 files changed, 33 insertions, 0 deletions
diff --git a/src/Grasp/Parser.hs b/src/Grasp/Parser.hs
index e7c920d..1ddbb94 100644
--- a/src/Grasp/Parser.hs
+++ b/src/Grasp/Parser.hs
@@ -1,7 +1,10 @@
 module Grasp.Parser (
     GraspProgram(..),
+    GraspData(..),
 
     parseGrasp,
+    nodesWithName,
+    iso,
     dup
     ) where
 
@@ -26,6 +29,14 @@ type StrLNode a = (String,a)
 
 type StrLEdge a = (String,String,a)
 
+type GraspData = ([StrLNode String],[StrLEdge String])
+
+
+
+instance (Ord a, Ord b) => Eq (Gr a b) where
+	a == b  =   ((sort . Graph.labNodes $ a) == (sort . Graph.labNodes $ b)) &&
+	            ((sort . Graph.labEdges $ a) == (sort . Graph.labEdges $ b))
+
 
 
 
@@ -88,6 +99,28 @@ constructGraph = uncurry Graph.mkGraph
 
 
 
+nodesWithName :: GraspProgram -> String -> [LNode String]
+nodesWithName g s = []
+
+
+
+normalise :: GraspData -> ([LNode String],[LEdge String])
+normalise (n,e) = ([],[])
+
+
+
+iso :: GraspProgram -> GraspProgram -> Bool
+iso a b =
+	let f (x,y) = (show x, y)
+	    g (x,y,z) = (show x, show y, z)
+
+        -- converts a grasp program into grasp data
+	    h x = ((map f) . Graph.labNodes $ x, (map g) . Graph.labEdges $ x)
+
+	in (constructGraph . normalise . h $ a) == (constructGraph . normalise . h $ b)
+
+
+
 dup :: (Eq a) => [a] -> Maybe a
 dup x =
 	let dup' [] _ = Nothing