rollback NFP interning (#344)

Author: pepeiborra

lsp-types/src/Language/LSP/Types/Uri.hs

@@ -25,20 +25,16 @@ import           Control.DeepSeq
 import qualified Data.Aeson                                 as A
 import           Data.Binary                                (Binary, Get, put, get)
 import           Data.Hashable
-import qualified Data.HashMap.Strict as HM
-import           Data.IORef                                (atomicModifyIORef', newIORef)
 import           Data.List                                  (stripPrefix)
 import           Data.String                                (IsString, fromString)
 import           Data.Text                                  (Text)
 import qualified Data.Text                                  as T
-import           Data.Tuple                                (swap)
 import           GHC.Generics
 import           Network.URI hiding (authority)
 import qualified System.FilePath                            as FP
 import qualified System.FilePath.Posix                      as FPP
 import qualified System.FilePath.Windows                    as FPW
 import qualified System.Info
-import           System.IO.Unsafe                          (unsafePerformIO)
 
 newtype Uri = Uri { getUri :: Text }
   deriving (Eq,Ord,Read,Show,Generic,A.FromJSON,A.ToJSON,Hashable,A.ToJSONKey,A.FromJSONKey)
@@ -175,7 +171,7 @@ instance Binary NormalizedFilePath where
 
 -- | A smart constructor that performs UTF-8 encoding and hash consing
 normalizedFilePath :: NormalizedUri -> FilePath -> NormalizedFilePath
-normalizedFilePath nuri nfp = intern $ NormalizedFilePath nuri nfp
+normalizedFilePath nuri nfp = NormalizedFilePath nuri nfp
 
 -- | Internal helper that takes a file path that is assumed to
 -- already be normalized to a URI. It is up to the caller
@@ -211,19 +207,4 @@ normalizedFilePathToUri (NormalizedFilePath uri _) = uri
 
 uriToNormalizedFilePath :: NormalizedUri -> Maybe NormalizedFilePath
 uriToNormalizedFilePath nuri = fmap (normalizedFilePath nuri) mbFilePath
-  where mbFilePath = platformAwareUriToFilePath System.Info.os (fromNormalizedUri nuri)
-
----------------------------------------------------------------------------
--- Unsafe hashcons of NFP
-internIO :: (Eq a, Hashable a) => IO (a -> IO a)
-internIO = do
-    tableRef <- newIORef mempty
-    let f x = atomicModifyIORef' tableRef $ swap . flip HM.alterF x (\case
-         Just res -> (res, Just res)
-         Nothing  -> (x, Just x)
-         )
-    return f
-
-{-# NOINLINE intern #-}
-intern :: NormalizedFilePath -> NormalizedFilePath
-intern = let f = unsafePerformIO internIO in \x -> unsafePerformIO (f x)
+  where mbFilePath = platformAwareUriToFilePath System.Info.os (fromNormalizedUri nuri)