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module GF.Command.Importing (importGrammar, importSource) where
import PGF
import PGF.Data
import GF.Compile
import GF.Compile.Multi (readMulti)
import GF.Compile.GetGrammar (getCFRules, getEBNFRules)
import GF.Grammar (identS, SourceGrammar) -- for cc command
import GF.Grammar.CFG
import GF.Grammar.EBNF
import GF.Compile.CFGtoPGF
import GF.Infra.UseIO
import GF.Infra.Option
import GF.Data.ErrM
import System.FilePath
import qualified Data.Set as Set
-- 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" -> importCF opts files getCFRules id
".ebnf" -> importCF opts files getEBNFRules ebnf2cf
".gfm" -> do
ascss <- mapM readMulti files
let cs = concatMap snd ascss
importGrammar pgf0 opts cs
s | elem s [".gf",".gfo"] -> do
res <- appIOE $ compileToPGF opts files
case res of
Ok pgf2 -> ioUnionPGF pgf0 pgf2
Bad msg -> do putStrLn ('\n':'\n':msg)
return pgf0
".pgf" -> do
pgf2 <- mapM readPGF files >>= return . foldl1 unionPGF
ioUnionPGF pgf0 pgf2
ext -> die $ "Unknown filename extension: " ++ show ext
ioUnionPGF :: PGF -> PGF -> IO PGF
ioUnionPGF one two = case msgUnionPGF one two of
(pgf, Just msg) -> putStrLn msg >> return pgf
(pgf,_) -> return pgf
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
-- for different cf formats
importCF opts files get convert = do
res <- appIOE impCF
case res of
Ok pgf -> return pgf
Bad s -> error s
where
impCF = do
rules <- fmap (convert . concat) $ mapM (get opts) files
startCat <- case rules of
(CFRule cat _ _ : _) -> return cat
_ -> fail "empty CFG"
let gf = cf2gf (last files) (uniqueFuns (mkCFG startCat Set.empty rules))
gr <- compileSourceGrammar opts gf
link opts (identS (justModuleName (last files) ++ "Abs"), (), gr)
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