Merge remote-tracking branch 'origin/ghc-8.10' into ghc-9.0

1 files changed, 29 insertions, 13 deletions

diff --git a/haddock-api/src/Haddock/Parser.hs b/haddock-api/src/Haddock/Parser.hs
index e1b5c787..0604a831 100644
--- a/haddock-api/src/Haddock/Parser.hs
+++ b/haddock-api/src/Haddock/Parser.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE ViewPatterns #-}
 -- |
 -- Module      :  Haddock.Parser
 -- Copyright   :  (c) Mateusz Kowalczyk 2013,
@@ -15,26 +16,41 @@ module Haddock.Parser ( parseParas
 
 import qualified Documentation.Haddock.Parser as P
 import Documentation.Haddock.Types
+import Haddock.Types
 
 import GHC.Driver.Session ( DynFlags )
 import GHC.Data.FastString   ( fsLit )
-import GHC.Parser.Lexer ( mkPState, unP, ParseResult(POk) )
+import GHC.Parser.Lexer ( mkPState, unP, ParseResult(POk, PFailed) )
 import GHC.Parser       ( parseIdentifier )
-import GHC.Types.Name.Reader ( RdrName )
-import GHC.Types.SrcLoc ( mkRealSrcLoc, unLoc )
+import GHC.Types.Name.Occurrence ( occNameString )
+import GHC.Types.Name.Reader ( RdrName(..) )
+import GHC.Types.SrcLoc ( mkRealSrcLoc, GenLocated(..), unLoc )
 import GHC.Data.StringBuffer ( stringToStringBuffer )
 
-parseParas :: DynFlags -> Maybe Package -> String -> MetaDoc mod RdrName
+
+parseParas :: DynFlags -> Maybe Package -> String -> MetaDoc mod (Wrap NsRdrName)
 parseParas d p = overDoc (P.overIdentifier (parseIdent d)) . P.parseParas p
 
-parseString :: DynFlags -> String -> DocH mod RdrName
+parseString :: DynFlags -> String -> DocH mod (Wrap NsRdrName)
 parseString d = P.overIdentifier (parseIdent d) . P.parseString
 
-parseIdent :: DynFlags -> String -> Maybe RdrName
-parseIdent dflags str0 =
-  let buffer = stringToStringBuffer str0
-      realSrcLc = mkRealSrcLoc (fsLit "<unknown file>") 0 0
-      pstate = mkPState dflags buffer realSrcLc
-  in case unP parseIdentifier pstate of
-    POk _ name -> Just (unLoc name)
-    _ -> Nothing
+parseIdent :: DynFlags -> Namespace -> String -> Maybe (Wrap NsRdrName)
+parseIdent dflags ns str0 =
+  case unP parseIdentifier (pstate str1) of
+    POk _ (L _ name)
+      -- Guards against things like 'Q.--', 'Q.case', etc.
+      -- See https://github.com/haskell/haddock/issues/952 and Trac #14109
+      | Qual _ occ <- name
+      , PFailed{} <- unP parseIdentifier (pstate (occNameString occ))
+      -> Nothing
+      | otherwise
+      -> Just (wrap (NsRdrName ns name))
+    PFailed{} -> Nothing
+  where
+    realSrcLc = mkRealSrcLoc (fsLit "<unknown file>") 0 0
+    pstate str = mkPState dflags (stringToStringBuffer str) realSrcLc
+    (wrap,str1) = case str0 of
+                    '(' : s@(c : _) | c /= ',', c /= ')'  -- rule out tuple names
+                                    -> (Parenthesized, init s)
+                    '`' : s@(_ : _) -> (Backticked,    init s)
+                    _               -> (Unadorned,     str0)