Large refactor with passing tests

1 files changed, 45 insertions, 0 deletions

diff --git a/src/VeriFuzz/Circuit/Internal.hs b/src/VeriFuzz/Circuit/Internal.hs
new file mode 100644
index 0000000..8a4cf4a
--- /dev/null
+++ b/src/VeriFuzz/Circuit/Internal.hs
@@ -0,0 +1,45 @@
+{-|
+Module      : VeriFuzz.Circuit.Internal
+Description : Internal helpers for generation.
+Copyright   : (c) 2018-2019, Yann Herklotz
+License     : BSD-3
+Maintainer  : ymherklotz [at] gmail [dot] com
+Stability   : experimental
+Portability : POSIX
+
+Internal helpers for generation.
+-}
+
+module VeriFuzz.Circuit.Internal
+    ( fromNode
+    , filterGr
+    , only
+    , inputs
+    , outputs
+    )
+where
+
+import           Data.Graph.Inductive (Graph, Node)
+import qualified Data.Graph.Inductive as G
+import qualified Data.Text            as T
+
+fromNode :: Int -> T.Text
+fromNode node = T.pack $ "w" <> show node
+
+filterGr :: (Graph gr) => gr n e -> (Node -> Bool) -> [Node]
+filterGr graph f = filter f $ G.nodes graph
+
+only
+    :: (Graph gr)
+    => gr n e
+    -> (gr n e -> Node -> Int)
+    -> (gr n e -> Node -> Int)
+    -> Node
+    -> Bool
+only graph fun1 fun2 n = fun1 graph n == 0 && fun2 graph n /= 0
+
+inputs :: (Graph gr) => gr n e -> [Node]
+inputs graph = filterGr graph $ only graph G.indeg G.outdeg
+
+outputs :: (Graph gr) => gr n e -> [Node]
+outputs graph = filterGr graph $ only graph G.outdeg G.indeg