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module GF.Command.Parse(readCommandLine, pCommand) where
import PGF.Expr
import PGF.Data(Tree)
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
test s = RP.readP_to_S pCommandLine s
pCommandLine = 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)
pOption = do
RP.char '-'
flg <- pIdent
RP.option (OOpt flg) (fmap (OFlag flg) (RP.char '=' >> pValue))
pValue = do
fmap (VInt . read) (RP.munch1 isDigit)
RP.<++
fmap VStr pStr
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 ATree (pTree False)
RP.<++
(RP.munch isSpace >> RP.char '%' >> fmap AMacro pIdent))
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