Safe Haskell	None
Language	Haskell2010

Scanner.Internal

Description

Scanner implementation

Synopsis

newtype Scanner a = Scanner {
- run :: forall r. ByteString -> Next a r -> Result r
}
type Next a r = ByteString -> a -> Result r
data Result r
- = Done ByteString r
- | Fail ByteString String
- | More (ByteString -> Result r)
scan :: Scanner r -> ByteString -> Result r
anyWord8 :: Scanner Word8
takeWhile :: (Word8 -> Bool) -> Scanner ByteString
take :: Int -> Scanner ByteString
endOfInput :: Scanner Bool
string :: ByteString -> Scanner ()
lookAhead :: Scanner (Maybe Word8)
foldlWhile :: (Word8 -> Bool) -> (a -> Word8 -> a) -> a -> Scanner a
foldlWhile1 :: (Word8 -> Bool) -> (a -> Word8 -> a) -> a -> Scanner a
satisfy :: (Word8 -> Bool) -> Scanner Word8
satisfyMaybe :: (Word8 -> Bool) -> Scanner (Maybe Word8)
decimal :: Integral n => Scanner n

Documentation

CPS scanner without backtracking

Constructors

Scanner
Fields run :: forall r. ByteString -> Next a r -> Result r

Instances details

Monad Scanner Source #
Instance details Defined in Scanner.Internal Methods (>>=) :: Scanner a -> (a -> Scanner b) -> Scanner b (>>) :: Scanner a -> Scanner b -> Scanner b return :: a -> Scanner a
Functor Scanner Source #
Instance details Defined in Scanner.Internal Methods fmap :: (a -> b) -> Scanner a -> Scanner b (<$) :: a -> Scanner b -> Scanner a
MonadFail Scanner Source #
Instance details Defined in Scanner.Internal Methods fail :: String -> Scanner a
Applicative Scanner Source #
Instance details Defined in Scanner.Internal Methods pure :: a -> Scanner a (<>) :: Scanner (a -> b) -> Scanner a -> Scanner b liftA2 :: (a -> b -> c) -> Scanner a -> Scanner b -> Scanner c (>) :: Scanner a -> Scanner b -> Scanner b (<*) :: Scanner a -> Scanner b -> Scanner a

type Next a r = ByteString -> a -> Result r Source #

Scanner continuation

Scanner result

Constructors

Done ByteString r	Successful result with the rest of input
Fail ByteString String	Scanner failed with rest of input and error message
More (ByteString -> Result r)	Need more input

scan :: Scanner r -> ByteString -> Result r Source #

Run scanner with the input

Consume the next word

It fails if end of input

takeWhile :: (Word8 -> Bool) -> Scanner ByteString Source #

Take input while the predicate is True

take :: Int -> Scanner ByteString Source #

Take the specified number of bytes

Returns True when there is no more input

string :: ByteString -> Scanner () Source #

Consume the specified string

Warning: it is not optimized yet, so for for small string it is better to consume it byte-by-byte using word8

Return the next byte, if any, without consuming it

foldlWhile :: (Word8 -> Bool) -> (a -> Word8 -> a) -> a -> Scanner a Source #

Fold over the octets, which satisfy the predicate

foldlWhile1 :: (Word8 -> Bool) -> (a -> Word8 -> a) -> a -> Scanner a Source #

Fold over the octets, which satisfy the predicate, ensuring that there's at least one

satisfy :: (Word8 -> Bool) -> Scanner Word8 Source #

Consume a single octet which satisfies the predicate and fail if it does not

satisfyMaybe :: (Word8 -> Bool) -> Scanner (Maybe Word8) Source #

Consume a single octet in case it satisfies the predicate

decimal :: Integral n => Scanner n Source #

Parse a non-negative decimal number in ASCII