Various fixes

src/Rubyhs/References.hs

@@ -42,6 +42,8 @@ graph b = span $ Graph.graphFromEdges $ go <$> toList ys
   go (x, xs) = (x, prettyContext x, prettyContext <$> toList xs)
   Result ys = references b
 
+-- The elements appear in reverse order.  I expect this to cause all
+-- sorts of issues.
 newtype Namespace = Namespace [Text]
 deriving stock instance Show Namespace
 deriving stock instance Eq Namespace
@@ -53,13 +55,11 @@ instance IsList Namespace where
 deriving newtype instance Semigroup Namespace
 deriving newtype instance Monoid Namespace
 instance FromJSON Namespace where
-  parseJSON = Aeson.withText "Namespace" $ \t -> Namespace <$> (traverse pure $ Text.splitOn "::" t)
+  parseJSON = Aeson.withText "Namespace"
+    $ \t -> Namespace <$> (traverse pure $ reverse $ Text.splitOn "::" t)
 instance ToJSON Namespace where
   toJSON = Aeson.String . showNamespace
 
-showNamespace :: Namespace -> Text
-showNamespace = Text.intercalate "::" . coerce
-
 -- Names are in reverse order.
 data FQN = FQN
   { namespace :: Namespace
@@ -79,6 +79,8 @@ instance FromJSON Node where
 nodeParser :: Text -> Aeson.Parser Node
 nodeParser = \t -> case Text.splitOn "." t of
     [mods,fun] -> fmap NodeDef (FQN <$> Aeson.parseJSON (Aeson.String mods) <*> pure fun)
+    -- The top-level
+    [[]]       -> pure $ NodeModule mempty
     [mods]     ->
       if beginsWithCapital mods
       then NodeModule <$> Aeson.parseJSON (Aeson.String mods)
@@ -112,6 +114,14 @@ prettyFQN FQN{name, namespace} = case namespace of
   [] -> name
   _ -> convertString (showNamespace namespace) <> "." <> name
 
+prettyContext :: Node -> Text
+prettyContext = \case
+  NodeDef fun -> prettyFQN fun
+  NodeModule ns -> showNamespace ns
+
+showNamespace :: Namespace -> Text
+showNamespace = Text.intercalate "::" . reverse . coerce
+
 newtype Context = Context Node
 
 deriving stock instance Eq Context
@@ -119,9 +129,12 @@ deriving stock instance Ord Context
 deriving newtype instance ToJSON Context
 -- HACK: Not really a semigroup as is evident from the implementation.
 instance Semigroup Context where
-  Context c0 <> Context c1 = case (c0, c1) of
-    (NodeModule n0, NodeModule n1)      -> Context $ NodeModule $ n0 <> n1
-    (NodeModule n0, NodeDef (FQN n1 f)) -> Context $ NodeDef $ FQN (n0 <> n1) f
+  -- I think that the order must be swapped because they modules are in reverse order.
+  Context c0 <> Context c1 = case traceShowId (c0, c1) of
+    -- (NodeModule n0, NodeModule n1)      -> Context $ NodeModule $ n0 <> n1
+    (NodeModule n0, NodeModule n1)      -> Context $ NodeModule $ n1 <> n0
+    -- (NodeModule n0, NodeDef (FQN n1 f)) -> Context $ NodeDef $ FQN (n0 <> n1) f
+    (NodeModule n0, NodeDef (FQN n1 f)) -> Context $ NodeDef $ FQN (n1 <> n0) f
     (NodeDef{}, NodeModule{})           -> error "Cannot append module to function context."
     (NodeDef{}, NodeDef{})              -> error "Cannot append function to function context."
 
@@ -145,11 +158,6 @@ instance ToJSON Result where
     where
     go :: (Node, Set Node) -> (Text, Aeson.Value)
     go (x, y) = (prettyContext x, Aeson.toJSON y)
-
-prettyContext :: Node -> Text
-prettyContext = \case
-  NodeDef fun -> prettyFQN fun
-  NodeModule ns -> showNamespace ns
   
 instance MyMonad (State Env) where
   declaration q = modify go
@@ -290,8 +298,8 @@ instance References Ruby.Def where
 
 instance References Ruby.Defs where
   -- TODO: The field `context` is also relevant here!
-  entries Ruby.Defs{atom, begin}
-    = entries $ Ruby.Def{atom,begin,args=error "hack"}
+  entries Ruby.Defs{atom, begin, args}
+    = entries $ Ruby.Def{atom,begin,args}
 
 qual :: Namespace -> Ruby.Atom -> FQN
 qual namespace (Ruby.Atom name) = FQN { namespace , name }