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module GF.Command.Importing (importGrammar, importSource) where
import PGF
import PGF.Data
import GF.Compile
import GF.Grammar.Grammar (SourceGrammar) -- for cc command
import GF.Infra.UseIO
import GF.Infra.Option
import GF.Data.ErrM
import GF.Source.CF
import Data.List (nubBy)
import System.FilePath
-- import a grammar in an environment where it extends an existing grammar
importGrammar :: PGF -> Options -> [FilePath] -> IO PGF
importGrammar pgf0 _ [] = return pgf0
importGrammar pgf0 opts files =
case takeExtensions (last files) of
".cf" -> do
s <- fmap unlines $ mapM readFile files
let cnc = justModuleName (last files)
gf <- case getCF cnc s of
Ok g -> return g
Bad s -> error s ----
Ok gr <- appIOE $ compileSourceGrammar opts gf
epgf <- appIOE $ link opts (cnc ++ "Abs") gr
case epgf of
Ok pgf -> return pgf
Bad s -> error s ----
s | elem s [".gf",".gfo"] -> do
res <- appIOE $ compileToPGF opts files
case res of
Ok pgf2 -> do return $ unionPGF pgf0 pgf2
Bad msg -> do putStrLn msg
return pgf0
".pgf" -> do
pgf2 <- mapM readPGF files >>= return . foldl1 unionPGF
return $ unionPGF pgf0 pgf2
ext -> die $ "Unknown filename extension: " ++ show ext
importSource :: SourceGrammar -> Options -> [FilePath] -> IO SourceGrammar
importSource src0 opts files = do
src <- appIOE $ batchCompile opts files
case src of
Ok gr -> return gr
Bad msg -> do
putStrLn msg
return src0
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