1 files changed, 22 insertions, 0 deletions

diff --git a/src/Data/JLD/Model/GraphObject.hs b/src/Data/JLD/Model/GraphObject.hs
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+++ b/src/Data/JLD/Model/GraphObject.hs
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+module Data.JLD.Model.GraphObject (isGraphObject, isNotGraphObject, toGraphObject) where
+
+import Data.JLD.Prelude
+
+import Data.JLD.Model.Keyword (Keyword (..), isKeyword)
+
+import Data.Aeson (Object, Value (..))
+import Data.Aeson.Key qualified as K (toText)
+import Data.Aeson.KeyMap qualified as KM (keys, singleton, member)
+import Data.Vector qualified as V (singleton)
+
+isGraphObject :: Value -> Bool
+isGraphObject (Object o)
+    | KM.member (show KeywordGraph) o =
+        all (`isKeyword` [KeywordGraph, KeywordId, KeywordIndex, KeywordContext]) (K.toText <$> KM.keys o)
+isGraphObject _ = False
+
+isNotGraphObject :: Value -> Bool
+isNotGraphObject = isGraphObject .> not
+
+toGraphObject :: Value -> Object
+toGraphObject = V.singleton .> Array .> KM.singleton (show KeywordGraph)