Data.Attoparsec.Zepto

A tiny, highly specialized combinator parser for ByteString strings.

While the main attoparsec module generally performs well, this module is particularly fast for simple non-recursive loops that should not normally result in failed parses.

Warning: on more complex inputs involving recursion or failure, parsers based on this module may be as much as ten times slower than regular attoparsec! You should only use this module when you have benchmarks that prove that its use speeds your code up.

Documentation

type Parser a = ZeptoT Identity a

data ZeptoT m a

A simple parser.

This monad is strict in its state, and the monadic bind operator (>>=) evaluates each result to weak head normal form before passing it along.

Instances

Monad m => Monad (ZeptoT m)

Methods

(>>=) :: ZeptoT m a -> (a -> ZeptoT m b) -> ZeptoT m b

(>>) :: ZeptoT m a -> ZeptoT m b -> ZeptoT m b

return :: a -> ZeptoT m a

fail :: String -> ZeptoT m a

Monad m => Functor (ZeptoT m)

Methods

fmap :: (a -> b) -> ZeptoT m a -> ZeptoT m b

(<$) :: a -> ZeptoT m b -> ZeptoT m a

Monad m => MonadFail (ZeptoT m)

Methods

fail :: String -> ZeptoT m a

Monad m => Applicative (ZeptoT m)

Methods

pure :: a -> ZeptoT m a

(<*>) :: ZeptoT m (a -> b) -> ZeptoT m a -> ZeptoT m b

(*>) :: ZeptoT m a -> ZeptoT m b -> ZeptoT m b

(<*) :: ZeptoT m a -> ZeptoT m b -> ZeptoT m a

MonadIO m => MonadIO (ZeptoT m)

Methods

liftIO :: IO a -> ZeptoT m a

Monad m => Alternative (ZeptoT m)

Methods

empty :: ZeptoT m a

(<|>) :: ZeptoT m a -> ZeptoT m a -> ZeptoT m a

some :: ZeptoT m a -> ZeptoT m [a]

many :: ZeptoT m a -> ZeptoT m [a]

Monad m => MonadPlus (ZeptoT m)

Methods

mzero :: ZeptoT m a

mplus :: ZeptoT m a -> ZeptoT m a -> ZeptoT m a

Monad m => Semigroup (ZeptoT m a)

Methods

(<>) :: ZeptoT m a -> ZeptoT m a -> ZeptoT m a

sconcat :: NonEmpty (ZeptoT m a) -> ZeptoT m a

stimes :: Integral b => b -> ZeptoT m a -> ZeptoT m a

Monad m => Monoid (ZeptoT m a)

Methods

mempty :: ZeptoT m a

mappend :: ZeptoT m a -> ZeptoT m a -> ZeptoT m a

mconcat :: [ZeptoT m a] -> ZeptoT m a

parse :: Parser a -> ByteString -> Either String a

Run a parser.

parseT :: Monad m => ZeptoT m a -> ByteString -> m (Either String a)

Run a parser on top of the given base monad.

atEnd :: Monad m => ZeptoT m Bool

Indicate whether the end of the input has been reached.

string :: Monad m => ByteString -> ZeptoT m ()

Match a string exactly.

take :: Monad m => Int -> ZeptoT m ByteString

Consume n bytes of input.

takeWhile :: Monad m => (Word8 -> Bool) -> ZeptoT m ByteString

Consume input while the predicate returns True.