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module GF.Command.Parse(readCommandLine, pCommand) where
import PGF.CId
import PGF.Expr
import GF.Command.Abstract
import Data.Char
import Control.Monad
import qualified Text.ParserCombinators.ReadP as RP
readCommandLine :: String -> Maybe CommandLine
readCommandLine s = case [x | (x,cs) <- RP.readP_to_S pCommandLine s, all isSpace cs] of
[x] -> Just x
_ -> Nothing
pCommandLine =
(RP.skipSpaces >> RP.char '-' >> RP.char '-' >> RP.skipMany (RP.satisfy (const True)) >> return []) -- comment
RP.<++
(RP.sepBy (RP.skipSpaces >> pPipe) (RP.skipSpaces >> RP.char ';'))
pPipe = RP.sepBy1 (RP.skipSpaces >> pCommand) (RP.skipSpaces >> RP.char '|')
pCommand = (do
cmd <- pIdent RP.<++ (RP.char '%' >> pIdent >>= return . ('%':))
RP.skipSpaces
opts <- RP.sepBy pOption RP.skipSpaces
arg <- pArgument
return (Command cmd opts arg)
)
RP.<++ (do
RP.char '?'
c <- pSystemCommand
return (Command "sp" [OFlag "command" (VStr c)] ANoArg)
)
pOption = do
RP.char '-'
flg <- pIdent
RP.option (OOpt flg) (fmap (OFlag flg) (RP.char '=' >> pValue))
pValue = do
fmap VInt (RP.readS_to_P reads)
RP.<++
fmap VStr (RP.readS_to_P reads)
RP.<++
fmap VId pFilename
pFilename = liftM2 (:) (RP.satisfy isFileFirst) (RP.munch (not . isSpace)) where
isFileFirst c = not (isSpace c) && not (isDigit c)
pArgument =
RP.option ANoArg
(fmap AExpr pExpr
RP.<++
(RP.munch isSpace >> RP.char '%' >> fmap AMacro pIdent))
pSystemCommand =
RP.munch isSpace >> (
(RP.char '"' >> (RP.manyTill (pEsc RP.<++ RP.get) (RP.char '"')))
RP.<++
RP.many RP.get
)
where
pEsc = RP.char '\\' >> RP.get
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