------------------------------------------------------------------------------
--- Reading OPTIONS pragmas
-
--- This is really very ugly and should be rewritten.
--- - some error messages are thrown as exceptions (should return)
--- - we ignore LINE pragmas
--- - parsing is horrible, combination of prefixMatch and 'read'.
-
-getOptionsFromSource
- :: String -- input file
- -> IO [String] -- options, if any
-getOptionsFromSource file
- = do h <- openFile file ReadMode
- look h 1 `finally` hClose h
- where
- look h i = do
- r <- tryJust ioErrors (hGetLine h)
- case r of
- Left e | isEOFError e -> return []
- | otherwise -> ioError e
- Right l' -> do
- let l = removeSpaces l'
- case () of
- () | null l -> look h (i+1)
- | prefixMatch "#" l -> look h (i+1)
- | prefixMatch "{-# LINE" l -> look h (i+1) -- -} wrong!
- | Just opts <- matchOptions i file l
- -> do rest <- look h (i+1)
- return (opts ++ rest)
- | otherwise -> return []
-
-getOptionsFromStringBuffer :: StringBuffer -> FilePath -> [(Int,String)]
-getOptionsFromStringBuffer buffer@(StringBuffer _ len _) fn =
- let
- ls = lines (lexemeToString buffer len) -- lazy, so it's ok
- in
- look 1 ls
- where
- look i [] = []
- look i (l':ls) = do
- let l = removeSpaces l'
- case () of
- () | null l -> look (i+1) ls
- | prefixMatch "#" l -> look (i+1) ls
- | prefixMatch "{-# LINE" l -> look (i+1) ls -- -} wrong!
- | Just opts <- matchOptions i fn l
- -> zip (repeat i) opts ++ look (i+1) ls
- | otherwise -> []
-
--- detect {-# OPTIONS_GHC ... #-}. For the time being, we accept OPTIONS
--- instead of OPTIONS_GHC, but that is deprecated.
-matchOptions i fn s
- | Just s1 <- maybePrefixMatch "{-#" s -- -}
- = matchOptions1 i fn (removeSpaces s1)
- | otherwise
- = Nothing
- where
- matchOptions1 i fn s
- | Just s2 <- maybePrefixMatch "OPTIONS" s
- = case () of
- _ | Just s3 <- maybePrefixMatch "_GHC" s2, not (is_ident (head s3))
- -> matchOptions2 i fn s3
- | not (is_ident (head s2))
- -> matchOptions2 i fn s2
- | otherwise
- -> Just [] -- OPTIONS_anything is ignored, not treated as start of source
- | Just s2 <- maybePrefixMatch "INCLUDE" s, not (is_ident (head s2)),
- Just s3 <- maybePrefixMatch "}-#" (reverse s2)
- = Just ["-#include", removeSpaces (reverse s3)]
-
- | Just s2 <- maybePrefixMatch "LANGUAGE" s, not (is_ident (head s2)),
- Just s3 <- maybePrefixMatch "}-#" (reverse s2)
- = case [ exts | (exts,"") <- reads ('[' : reverse (']':s3))] of
- [] -> languagePragParseError i fn
- exts:_ -> case extensionsToGHCFlag exts of
- ([], opts) -> Just opts
- (unsup,_) -> unsupportedExtnError i fn unsup
- | otherwise = Nothing
- matchOptions2 i fn s
- | Just s3 <- maybePrefixMatch "}-#" (reverse s) = Just (words (reverse s3))
- | otherwise = Nothing
-
-
-languagePragParseError i fn =
- pgmError (showSDoc (mkLocMessage loc (
- text "cannot parse LANGUAGE pragma")))
- where loc = srcLocSpan (mkSrcLoc (mkFastString fn) i 0)
-
-unsupportedExtnError i fn unsup =
- pgmError (showSDoc (mkLocMessage loc (
- text "unsupported extensions: " <>
- hcat (punctuate comma (map (text.show) unsup)))))
- where loc = srcLocSpan (mkSrcLoc (mkFastString fn) i 0)
-
-
-optionsErrorMsgs :: [String] -> [(Int,String)] -> FilePath -> Messages
-optionsErrorMsgs unhandled_flags flags_lines filename
- = (emptyBag, listToBag (map mkMsg unhandled_flags_lines))
- where
- unhandled_flags_lines = [ (l,f) | f <- unhandled_flags,
- (l,f') <- flags_lines, f == f' ]
- mkMsg (line,flag) =
- ErrUtils.mkPlainErrMsg (srcLocSpan loc) $
- text "unknown flag in {-# OPTIONS #-} pragma:" <+> text flag
- where
- loc = mkSrcLoc (mkFastString filename) line 0
- -- ToDo: we need a better SrcSpan here