1 files changed, 21 insertions, 0 deletions

diff --git a/src/Data/JLD/Model/NodeObject.hs b/src/Data/JLD/Model/NodeObject.hs
new file mode 100644
index 0000000..d0bb4c5
--- /dev/null
+++ b/src/Data/JLD/Model/NodeObject.hs
@@ -0,0 +1,21 @@
+module Data.JLD.Model.NodeObject (isNodeObject, isNotNodeObject) where
+
+import Data.JLD.Prelude
+
+import Data.JLD.Model.Keyword (Keyword (..))
+
+import Data.Aeson (Value (..))
+import Data.Aeson.Key qualified as K
+import Data.Aeson.KeyMap qualified as KM
+
+isNodeObject :: Value -> Bool
+isNodeObject (Object o) =
+    ( not (KM.member (show KeywordValue) o)
+        && not (KM.member (show KeywordList) o)
+        && not (KM.member (show KeywordSet) o)
+    )
+        || (KM.keys o == ([KeywordContext, KeywordGraph] <&> show .> K.fromText))
+isNodeObject _ = False
+
+isNotNodeObject :: Value -> Bool
+isNotNodeObject = isNodeObject .> not