Devel/GF3: experimentally putting together all functionalities for the first time

src/GF/Command/Importing.hs

@@ -0,0 +1,34 @@
+module GF.Command.Importing (importGrammar) where
+
+import GF.Devel.Compile
+import GF.Devel.GrammarToGFCC
+import GF.GFCC.OptimizeGFCC
+import GF.GFCC.CheckGFCC
+import GF.GFCC.DataGFCC
+import GF.GFCC.ParGFCC
+import GF.GFCC.API
+import qualified GF.Command.AbsGFShell as C
+
+import GF.Devel.UseIO
+import GF.Infra.Option
+
+import Data.List (nubBy)
+
+-- import a grammar in an environment where it extends an existing grammar
+importGrammar :: MultiGrammar -> Options -> [FilePath] -> IO MultiGrammar
+importGrammar mgr0 opts files = do
+  gfcc2 <- case fileSuffix (last files) of
+    s | elem s ["gf","gfo"] -> do
+      gr <- batchCompile opts files
+      let name = justModuleName (last files)
+      let (abs,gfcc0) = mkCanon2gfcc opts name gr
+      (gfcc1,b) <- checkGFCC gfcc0
+      if b then return () else do
+        putStrLn "Corrupted GFCC"
+      return $ if oElem (iOpt "noopt") opts then gfcc1 else optGFCC gfcc1
+    "gfcc" -> 
+      mapM file2gfcc files >>= return . foldl1 unionGFCC
+  let gfcc3 = unionGFCC (gfcc mgr0) gfcc2
+  return $ MultiGrammar gfcc3 
+     (nubBy (\ (x,_) (y,_) -> x == y) (gfcc2parsers gfcc3 ++ parsers mgr0)) 
+     -- later coming parsers override