module Database.Redis.Reply (Reply(..), reply) where
import Prelude hiding (error, take)
import Control.Applicative
import Data.Attoparsec (takeTill)
import Data.Attoparsec.Char8 hiding (takeTill)
import Data.ByteString.Char8 (ByteString)
data Reply = SingleLine ByteString
| Error ByteString
| Integer Integer
| Bulk (Maybe ByteString)
| MultiBulk (Maybe [Reply])
deriving (Eq, Show)
reply :: Parser Reply
reply = choice [singleLine, integer, bulk, multiBulk, error]
singleLine :: Parser Reply
singleLine = SingleLine <$> (char '+' *> takeTill isEndOfLine <* endOfLine)
error :: Parser Reply
error = Error <$> (char '-' *> takeTill isEndOfLine <* endOfLine)
integer :: Parser Reply
integer = Integer <$> (char ':' *> signed decimal <* endOfLine)
bulk :: Parser Reply
bulk = Bulk <$> do
len <- char '$' *> signed decimal <* endOfLine
if len < 0
then return Nothing
else Just <$> take len <* endOfLine
multiBulk :: Parser Reply
multiBulk = MultiBulk <$> do
len <- char '*' *> signed decimal <* endOfLine
if len < 0
then return Nothing
else Just <$> count len reply