52 lines
1.9 KiB
Haskell
52 lines
1.9 KiB
Haskell
module InterfaceSerialization ( loadInterface
|
|
, interfaceDecode
|
|
, validVersion
|
|
) where
|
|
|
|
import qualified Data.ByteString.Lazy as L
|
|
import qualified Data.Binary as Binary
|
|
|
|
import qualified Elm.Internal.Version as Version
|
|
import System.Directory (doesFileExist)
|
|
import System.IO (hPutStrLn, stderr)
|
|
import System.Exit (exitFailure)
|
|
|
|
import SourceSyntax.Module
|
|
|
|
loadInterface :: FilePath -> IO (Either String L.ByteString)
|
|
loadInterface filePath = do
|
|
exists <- doesFileExist filePath
|
|
if exists
|
|
then do
|
|
byteString <- L.readFile filePath
|
|
return $ Right byteString
|
|
|
|
else
|
|
return $ Left $ "Unable to find file " ++ filePath ++
|
|
" for deserialization!"
|
|
|
|
interfaceDecode :: Binary.Binary a =>
|
|
FilePath -> L.ByteString -> Either String a
|
|
interfaceDecode filePath bytes = do
|
|
case Binary.decodeOrFail bytes of
|
|
Right (_, _, binaryInfo) -> Right binaryInfo
|
|
|
|
Left (_, offset, err) ->
|
|
Left $ concat [ "Error reading build artifact: ", filePath, "\n"
|
|
, " The exact error was '", err, "' at offset ", show offset, ".\n"
|
|
, " The file was generated by a previous build and may be outdated or corrupt.\n"
|
|
, " Please remove the file and try again."
|
|
]
|
|
|
|
validVersion :: FilePath -> (String, ModuleInterface) ->
|
|
Either String (String, ModuleInterface)
|
|
validVersion filePath (name, interface) =
|
|
if iVersion interface == Version.elmVersion then
|
|
Right (name, interface)
|
|
else
|
|
Left $ concat
|
|
[ "Error reading build artifact: ", filePath, "\n"
|
|
, " It was generated by a different version of the compiler: "
|
|
, show (iVersion interface), "\n"
|
|
, " Please remove the file and try again.\n"
|
|
]
|