simplify duplicate genvar conversion

src/Convert/DuplicateGenvar.hs

@@ -6,47 +6,20 @@
 
 module Convert.DuplicateGenvar (convert) where
 
-import Control.Monad.State.Strict
-import qualified Data.Set as Set
-
+import Convert.Scoper
 import Convert.Traverse
 import Language.SystemVerilog.AST
 
-type IdentSet = Set.Set Identifier
-
 convert :: [AST] -> [AST]
 convert = map $ traverseDescriptions traverseDescription
 
 traverseDescription :: Description -> Description
-traverseDescription (part @ Part{}) =
-    Part attrs extern kw lifetime name ports items'
-    where
-        Part attrs extern kw lifetime name ports items = part
-        -- intentionally only looks at top level module items
-        items' = evalState (mapM traverseModuleItemM items) Set.empty
-traverseDescription other = other
+traverseDescription = partScoper return traverseModuleItemM return return
 
-traverseModuleItemM :: ModuleItem -> State IdentSet ModuleItem
+traverseModuleItemM :: ModuleItem -> Scoper () ModuleItem
 traverseModuleItemM (Genvar x) = do
-    alreadyExists <- gets $ Set.member x
-    if alreadyExists
-        then return $ Generate []
-        else do
-            modify $ Set.insert x
-            return $ Genvar x
-traverseModuleItemM (Generate items) = do
-    s <- get
-    items' <- traverseItems items
-    s' <- get
-    items'' <- traverseItems items'
-    let genvarDecls = map (GenModuleItem . Genvar) $
-            Set.toList $ Set.difference s' s
-    return $ Generate (genvarDecls ++ items'')
-    where traverseItems = mapM $ traverseNestedGenItemsM traverseGenItemM
-traverseModuleItemM other = return other
-
-traverseGenItemM :: GenItem -> State IdentSet GenItem
-traverseGenItemM (GenModuleItem item) = do
-    item' <- traverseModuleItemM item
-    return $ GenModuleItem item'
-traverseGenItemM other = return other
+    details <- lookupElemM x
+    if details == Nothing
+        then insertElem x () >> return (Genvar x)
+        else return $ Generate []
+traverseModuleItemM item = return item