Created
August 29, 2012 10:03
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TNetstring parser
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module TParser where | |
import Text.ParserCombinators.Parsec | |
import qualified Data.Map as Map | |
import Control.Applicative hiding (many) | |
data TNetString = N | |
| B Bool | |
| S String | |
| I Integer | |
| F Float | |
| L [TNetString] | |
| D (Map.Map String TNetString) | |
deriving (Eq, Show) | |
tnetstring = do | |
size <- readSize | |
char ':' | |
choice (map try [ parseNull size | |
, parseBool size | |
, parseString size | |
, parseInteger size | |
, parseFloat size | |
, parseDict size | |
, parseList size | |
]) <?> "tnetstring format suffix" | |
parseNull 0 = char '~' >> return N | |
parseNull _ = pzero | |
parseBool 4 = string "true!" >> return (B True) | |
parseBool 5 = string "false!" >> return (B False) | |
parseBool _ = pzero | |
parseString l = S <$> readContents l <* char ',' | |
parseInteger l = I . read <$> readContents l <* char '#' | |
parseFloat l = F . read <$> readContents l <* char '^' | |
parseList _ = L <$> many tnetstring <* char ']' | |
parseDict _ = D . Map.fromList <$> many pair <* char '}' | |
pair = do | |
S key_string <- tnetstring | |
contents <- tnetstring | |
return (key_string, contents) | |
readSize = fmap read $ many1 digit | |
readContents size = count size anyChar | |
parseTnetstring :: String -> Either ParseError TNetString | |
parseTnetstring = parse tnetstring "(unknown)" |
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