forked from GitHub/gf-core
66 lines
1.7 KiB
Haskell
66 lines
1.7 KiB
Haskell
module GF.Command.Parse(readCommandLine, pCommand) where
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import PGF.CId
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import PGF.Expr
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import PGF.Data(Tree)
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import GF.Command.Abstract
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import Data.Char
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import Control.Monad
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import qualified Text.ParserCombinators.ReadP as RP
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readCommandLine :: String -> Maybe CommandLine
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readCommandLine s = case [x | (x,cs) <- RP.readP_to_S pCommandLine s, all isSpace cs] of
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[x] -> Just x
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_ -> Nothing
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pCommandLine =
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(RP.skipSpaces >> RP.char '-' >> RP.char '-' >> RP.skipMany (RP.satisfy (const True)) >> return []) -- comment
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RP.<++
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(RP.sepBy (RP.skipSpaces >> pPipe) (RP.skipSpaces >> RP.char ';'))
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pPipe = RP.sepBy1 (RP.skipSpaces >> pCommand) (RP.skipSpaces >> RP.char '|')
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pCommand = (do
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cmd <- pIdent RP.<++ (RP.char '%' >> pIdent >>= return . ('%':))
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RP.skipSpaces
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opts <- RP.sepBy pOption RP.skipSpaces
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arg <- pArgument
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return (Command cmd opts arg)
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)
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RP.<++ (do
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RP.char '?'
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c <- pSystemCommand
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return (Command "sp" [OFlag "command" (VStr c)] ANoArg)
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)
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pOption = do
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RP.char '-'
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flg <- pIdent
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RP.option (OOpt flg) (fmap (OFlag flg) (RP.char '=' >> pValue))
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pValue = do
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fmap (VInt . read) (RP.munch1 isDigit)
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RP.<++
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fmap VStr pStr
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RP.<++
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fmap VId pFilename
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pFilename = liftM2 (:) (RP.satisfy isFileFirst) (RP.munch (not . isSpace)) where
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isFileFirst c = not (isSpace c) && not (isDigit c)
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pArgument =
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RP.option ANoArg
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(fmap ATree (pTree False)
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RP.<++
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(RP.munch isSpace >> RP.char '%' >> fmap AMacro pIdent))
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pSystemCommand =
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RP.munch isSpace >> (
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(RP.char '"' >> (RP.manyTill (pEsc RP.<++ RP.get) (RP.char '"')))
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RP.<++
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RP.many RP.get
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)
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where
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pEsc = RP.char '\\' >> RP.get
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