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{-# LANGUAGE OverloadedStrings #-}
module Reaktor.Parser where
import Control.Applicative
import Data.Attoparsec.ByteString.Char8
import qualified Data.ByteString.Char8.Extended as BS
import qualified Data.Char
import Reaktor.Types
prefix :: Parser Prefix
prefix = BS.pack <$> many (satisfy Data.Char.isAlphaNum <|>
satisfy (flip elem (":.-@/!~[]\\`_^{|}" :: String)))
command :: Parser Command
command = BS.pack <$> many1 (satisfy Data.Char.isAlphaNum)
nospcrlfcl :: Parser Char
nospcrlfcl =
satisfy (flip notElem ("\NUL\CR\LF :" :: String)) <?> "nospcrlfcl"
middle :: Parser Param
middle =
BS.pack <$> ((:) <$> nospcrlfcl <*> many (char ':' <|> nospcrlfcl))
<?> "middle"
trailing :: Parser Param
trailing =
BS.pack <$> many (char ':' <|> char ' ' <|> nospcrlfcl)
<?> "trailing"
params :: Parser [Param]
params = (do
a <- many (char ' ' *> middle)
b <- optional (char ' ' *> char ':' *> trailing)
return $ a <> (maybe [] (:[]) b))
<?> "params"
message :: Parser Message
message =
Message
<$> optional (char ':' *> prefix <* char ' ')
<*> command
<*> params
<* string "\r\n"
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