Bump version of .gfo and .pgf files, improve error messages on version mismatch

Becacuse of the new special tokens added to the Symbol type, .gfo and .pgf
files produced with the current version of GF can not always be used with
older versions of GF and the PGF run-time system.

The PGF version number was increased from (2,0) to (2,1). GF can still
read version (2,0) and (1,0), so old PGF files continue to work.

The GFO version was increased from "GF03" to "GF04".

src/compiler/GF/Compile/ReadFiles.hs

@@ -20,7 +20,7 @@
 
 module GF.Compile.ReadFiles
            ( getAllFiles,ModName,ModEnv,importsOfModule,
-             findFile,gfImports,gfoImports,
+             findFile,gfImports,gfoImports,VersionTagged(..),
              parseSource,getOptionsFromFile,getPragmas) where
 
 import Prelude hiding (catch)
@@ -32,7 +32,7 @@ import GF.Data.Operations
 import GF.Grammar.Lexer
 import GF.Grammar.Parser
 import GF.Grammar.Grammar
-import GF.Grammar.Binary(decodeModuleHeader)
+import GF.Grammar.Binary(VersionTagged(..),decodeModuleHeader)
 
 import System.IO(mkTextEncoding)
 import GF.Text.Coding(decodeUnicodeIO)
@@ -107,10 +107,10 @@ getAllFiles opts ps env file = do
           case st of
             CSEnv  -> return (st, (name, maybe [] snd mb_envmod))
             CSRead -> do let gfo = if isGFO file then file else gf2gfo opts file
-                         mb_imps <- gfoImports gfo
-                         case mb_imps of
-                           Just imps -> return (st,imps)
-                           Nothing
+                         t_imps <- gfoImports gfo
+                         case t_imps of
+                           Tagged imps -> return (st,imps)
+                           WrongVersion
                              | isGFO file -> raise (file ++ " is compiled with different GF version and I can't find the source file")
                              | otherwise  -> do imps <- gfImports opts file
                                                 return (CSComp,imps)
@@ -143,7 +143,7 @@ findFile gfoDir ps name =
 
 gfImports opts file = importsOfModule `fmap` parseModHeader opts file
 
-gfoImports gfo = fmap importsOfModule `fmap` liftIO (decodeModuleHeader gfo)
+gfoImports gfo = fmap importsOfModule `fmap` decodeModuleHeader gfo
 
 --------------------------------------------------------------------------------
 

src/compiler/GF/CompileInParallel.hs

@@ -9,7 +9,7 @@ import qualified GF.System.Directory as D
 import GF.System.Catch(catch,try)
 import Data.List(nub,isPrefixOf,intercalate,partition)
 import qualified Data.Map as M
-import GF.Compile.ReadFiles(getOptionsFromFile,findFile,gfImports,gfoImports)
+import GF.Compile.ReadFiles(getOptionsFromFile,findFile,gfImports,gfoImports,VersionTagged(..))
 import GF.CompileOne(reuseGFO,useTheSource)
 import GF.Infra.Option
 import GF.Infra.UseIO
@@ -177,8 +177,10 @@ getPathFromFile lib_dir cmdline_opts file =
 getImports opts file =
     if isGFO file then gfoImports' file else gfImports opts file
   where
-    gfoImports' file = maybe bad return =<< gfoImports file
-      where bad = raise $ file++": bad .gfo file"
+    gfoImports' file = check =<< gfoImports file
+      where
+        check (Tagged imps) = return imps
+        check WrongVersion = raise $ file++": .gfo file version mismatch"
 
 relativeTo lib_dir cwd path =
     if length librel<length cwdrel then librel else cwdrel

src/compiler/GF/Grammar/Binary.hs

@@ -7,15 +7,13 @@
 --
 -----------------------------------------------------------------------------
 
-module GF.Grammar.Binary(decodeModule,decodeModuleHeader,encodeModule) where
+module GF.Grammar.Binary(VersionTagged(..),decodeModuleHeader,decodeModule,encodeModule) where
 
 import Prelude hiding (catch)
 import Control.Exception(catch,ErrorCall(..),throwIO)
 
---import Data.Char
 import PGF.Internal(Binary(..),Word8,putWord8,getWord8,encodeFile,decodeFile)
---import Control.Monad
-import qualified Data.Map as Map
+import qualified Data.Map as Map(empty)
 import qualified Data.ByteString.Char8 as BS
 
 import GF.Data.Operations
@@ -28,7 +26,7 @@ import PGF() -- Binary instances
 import PGF.Internal(Literal(..))
 
 -- Please change this every time when the GFO format is changed
-gfoVersion = "GF03"
+gfoVersion = "GF04"
 
 instance Binary Ident where
   put id = put (ident2utf8 id)
@@ -315,6 +313,10 @@ instance Binary a => Binary (VersionTagged a) where
              then fmap Tagged get
              else return WrongVersion
 
+instance Functor VersionTagged where
+  fmap f (Tagged a) = Tagged (f a)
+  fmap f WrongVersion = WrongVersion
+
 gfoBinVersion = (b1,b2,b3,b4)
   where [b1,b2,b3,b4] = map (toEnum.fromEnum) gfoVersion :: [Word8]
 
@@ -324,23 +326,14 @@ decodeModule fpath = liftIO $ check =<< decodeFile' fpath
   where
     check (Tagged m) = return m
     check _ = fail ".gfo file version mismatch"
-{-
-decodeModuleHeader fpath = decodeFile_ fpath getVersionedMod
+
+-- | Read just the module header, the returned 'Module' will have an empty body
+decodeModuleHeader :: MonadIO io => FilePath -> io (VersionTagged Module)
+decodeModuleHeader = liftIO . fmap (fmap conv) . decodeFile'
   where
-    getVersionedMod = do
-      ver <- getGFOVersion
-      if ver == gfoVersion
-        then do (m,mtype,mstatus,mflags,mextend,mwith,mopens,med,msrc) <- get
-                return (Just (m,ModInfo mtype mstatus mflags mextend mwith mopens med msrc Nothing Map.empty))
-        else return Nothing
---}
---{-
-decodeModuleHeader fpath = fmap check $ decodeFile' fpath
-  where
-    check (Tagged (m,mtype,mstatus,mflags,mextend,mwith,mopens,med,msrc)) =
-        (Just (m,ModInfo mtype mstatus mflags mextend mwith mopens med msrc Nothing Map.empty))
-    check _ = Nothing
---}
+    conv (m,mtype,mstatus,mflags,mextend,mwith,mopens,med,msrc) =
+        (m,ModInfo mtype mstatus mflags mextend mwith mopens med msrc Nothing Map.empty)
+
 encodeModule :: MonadIO io => FilePath -> SourceModule -> io ()
 encodeModule fpath mo = liftIO $ encodeFile fpath (Tagged mo)
 

src/runtime/haskell/PGF/Binary.hs

@@ -15,7 +15,7 @@ import qualified Data.IntMap as IntMap
 import Control.Monad
 
 pgfMajorVersion, pgfMinorVersion :: Word16
-version@(pgfMajorVersion, pgfMinorVersion) = (2,0)
+version@(pgfMajorVersion, pgfMinorVersion) = (2,1)
 
 instance Binary PGF where
   put pgf = do putWord16be pgfMajorVersion
@@ -23,11 +23,14 @@ instance Binary PGF where
                put (gflags pgf)
                put (absname pgf, abstract pgf)
                put (concretes pgf)
-  get = do v1 <- getWord16be
-           v2 <- getWord16be
-           case (v1,v2) of
-             v | v==version -> getPGF'
-               | v==Old.version -> Old.getPGF'
+  get = do major<- getWord16be
+           minor <- getWord16be
+           let v = (major,minor)
+           if major==pgfMajorVersion && minor<=pgfMinorVersion
+             then getPGF'
+             else if v==Old.version 
+                  then Old.getPGF'
+                  else fail $ "Unsupported PGF version "++show (major,minor)
 
 getPGF'=do gflags <- get
            (absname,abstract) <- get