import Maybes
import Bag ( emptyBag, listToBag )
-import Distribution.Compiler
-import Distribution.Version
-
import Control.Exception
import Control.Monad
import System.Exit
checkExtension :: Located FastString -> Located String
checkExtension (L l ext)
- = case reads (unpackFS ext) of
- [] -> languagePragParseError l
- (okExt,""):_ ->
- case readVersion cProjectVersion of
- Just version ->
- case extensionsToGHCFlag version [okExt] of
- ([],[opt]) -> L l opt
- _ -> unsupportedExtnError l okExt
- Nothing ->
- panic ("Can't parse version: " ++ show cProjectVersion)
+-- Checks if a given extension is valid, and if so returns
+-- its corresponding flag. Otherwise it throws an exception.
+ = let ext' = unpackFS ext in
+ if ext' `elem` supportedLanguages
+ || ext' `elem` (map ("No"++) supportedLanguages)
+ then L l ("-X"++ext')
+ else unsupportedExtnError l ext'
languagePragParseError loc =
pgmError (showSDoc (mkLocMessage loc (
unsupportedExtnError loc unsup =
pgmError (showSDoc (mkLocMessage loc (
text "unsupported extension: " <>
- (text.show) unsup)))
+ text unsup)))
optionsErrorMsgs :: [String] -> [Located String] -> FilePath -> Messages