Add remove duplicates

1 files changed, 16 insertions, 4 deletions

diff --git a/src/Test/VeriFuzz/Graph/Random.hs b/src/Test/VeriFuzz/Graph/Random.hs
index 7f9e3e6..fa72f2f 100644
--- a/src/Test/VeriFuzz/Graph/Random.hs
+++ b/src/Test/VeriFuzz/Graph/Random.hs
@@ -12,11 +12,23 @@ Define the random generation for the directed acyclic graph.
 
 module Test.VeriFuzz.Graph.Random where
 
-import           Data.Graph.Inductive              (Graph, LEdge, mkGraph)
+import           Data.Graph.Inductive              (Context, Graph, LEdge)
+import qualified Data.Graph.Inductive              as G
 import           Data.Graph.Inductive.PatriciaTree (Gr)
+import           Data.List                         (nub)
 import           Test.QuickCheck                   (Arbitrary, Gen)
 import qualified Test.QuickCheck                   as QC
 
+dupFolder :: (Eq a, Eq b) => Context a b -> [Context a b] -> [Context a b]
+dupFolder cont ns =
+  unique cont : ns
+  where
+    unique (a, b, c, d) = (nub a, b, c, nub d)
+
+-- | Remove duplicates.
+rDups :: (Eq a, Eq b) => Gr a b -> Gr a b
+rDups g = G.buildGr $ G.ufold dupFolder [] g
+
 -- | Gen instance to create an arbitrary edge, where the edges are limited by
 -- `n` that is passed to it.
 arbitraryEdge :: (Arbitrary e) => Int -> Gen (LEdge e)
@@ -29,18 +41,18 @@ arbitraryEdge n = do
       with = QC.suchThat $ QC.resize n QC.arbitrary
 
 -- | Gen instance for a random acyclic DAG.
-randomDAG :: (Arbitrary l, Arbitrary e)
+randomDAG :: (Arbitrary l, Arbitrary e, Eq l, Eq e)
           => Gen (Gr l e) -- ^ The generated graph. It uses Arbitrary to
                           -- generate random instances of each node
 randomDAG = do
   list <- QC.infiniteListOf QC.arbitrary
   l <- QC.infiniteListOf $ aE
-  QC.sized (\n -> return . mkGraph (nodes list n) $ take (10*n) l)
+  QC.sized (\n -> return . G.mkGraph (nodes list n) $ take (10*n) l)
     where
       nodes l n = zip [0..n] $ take n l
       aE = QC.sized arbitraryEdge
 
 -- | Generate a random acyclic DAG with an IO instance.
-genRandomDAG :: (Arbitrary l, Arbitrary e)
+genRandomDAG :: (Arbitrary l, Arbitrary e, Eq l, Eq e)
              => IO (Gr l e)
 genRandomDAG = QC.generate randomDAG