Copyright	2010-2011 John Millikin
License	MIT
Maintainer	jmillikin@gmail.com
Portability	portable
Safe Haskell	Safe
Language	Haskell98

Data.Enumerator.Binary

Contents

IO
List analogues

Description

Byte-oriented alternatives to Data.Enumerator.List. Note that the enumeratees in this module must unpack their inputs to work properly. If you do not need to handle leftover input on a byte-by-byte basis, the chunk-oriented versions will be much faster.

This module is intended to be imported qualified:

import qualified Data.Enumerator.Binary as EB

Since: 0.4.5

Synopsis

IO

enumHandle

Arguments

:: MonadIO m
=> Integer	Buffer size
-> Handle
-> Enumerator ByteString m b

Read bytes (in chunks of the given buffer size) from the handle, and stream them to an Iteratee. If an exception occurs during file IO, enumeration will stop and Error will be returned. Exceptions from the iteratee are not caught.

This enumerator blocks until at least one byte is available from the handle, and might read less than the maximum buffer size in some cases.

The handle should be opened with no encoding, and in ReadMode or ReadWriteMode.

Since: 0.4.5

enumHandleRange

Arguments

:: MonadIO m
=> Integer	Buffer size
-> Maybe Integer	Offset
-> Maybe Integer	Maximum count
-> Handle
-> Enumerator ByteString m b

Read bytes (in chunks of the given buffer size) from the handle, and stream them to an Iteratee. If an exception occurs during file IO, enumeration will stop and Error will be returned. Exceptions from the iteratee are not caught.

This enumerator blocks until at least one byte is available from the handle, and might read less than the maximum buffer size in some cases.

The handle should be opened with no encoding, and in ReadMode or ReadWriteMode.

If an offset is specified, the handle will be seeked to that offset before reading. If the handle cannot be seeked, an error will be thrown.

If a maximum count is specified, the number of bytes read will not exceed that count.

Since: 0.4.8

enumFile :: FilePath -> Enumerator ByteString IO b

Opens a file path in binary mode, and passes the handle to enumHandle. The file will be closed when enumeration finishes.

Since: 0.4.5

enumFileRange

Arguments

:: FilePath
-> Maybe Integer	Offset
-> Maybe Integer	Maximum count
-> Enumerator ByteString IO b

Opens a file path in binary mode, and passes the handle to enumHandleRange. The file will be closed when enumeration finishes.

Since: 0.4.8

iterHandle :: MonadIO m => Handle -> Iteratee ByteString m ()

Read bytes from a stream and write them to a handle. If an exception occurs during file IO, enumeration will stop and Error will be returned.

The handle should be opened with no encoding, and in WriteMode or ReadWriteMode.

Since: 0.4.5

List analogues

Folds

fold :: Monad m => (b -> Word8 -> b) -> b -> Iteratee ByteString m b

Consume the entire input stream with a strict left fold, one byte at a time.

Since: 0.4.8

foldM :: Monad m => (b -> Word8 -> m b) -> b -> Iteratee ByteString m b

Consume the entire input stream with a strict monadic left fold, one byte at a time.

Since: 0.4.8

Maps

map :: Monad m => (Word8 -> Word8) -> Enumeratee ByteString ByteString m b

map f applies f to each input byte and feeds the resulting outputs to the inner iteratee.

Since: 0.4.8

mapM :: Monad m => (Word8 -> m Word8) -> Enumeratee ByteString ByteString m b

mapM f applies f to each input byte and feeds the resulting outputs to the inner iteratee.

Since: 0.4.8

mapM_ :: Monad m => (Word8 -> m ()) -> Iteratee ByteString m ()

mapM_ f applies f to each input byte, and discards the results.

Since: 0.4.11

concatMap :: Monad m => (Word8 -> ByteString) -> Enumeratee ByteString ByteString m b

concatMap f applies f to each input byte and feeds the resulting outputs to the inner iteratee.

Since: 0.4.8

concatMapM :: Monad m => (Word8 -> m ByteString) -> Enumeratee ByteString ByteString m b

concatMapM f applies f to each input byte and feeds the resulting outputs to the inner iteratee.

Since: 0.4.8

Accumulating maps

mapAccum :: Monad m => (s -> Word8 -> (s, Word8)) -> s -> Enumeratee ByteString ByteString m b

Similar to map, but with a stateful step function.

Since: 0.4.9

mapAccumM :: Monad m => (s -> Word8 -> m (s, Word8)) -> s -> Enumeratee ByteString ByteString m b

Similar to mapM, but with a stateful step function.

Since: 0.4.9

concatMapAccum :: Monad m => (s -> Word8 -> (s, ByteString)) -> s -> Enumeratee ByteString ByteString m b

Similar to concatMap, but with a stateful step function.

Since: 0.4.11

concatMapAccumM :: Monad m => (s -> Word8 -> m (s, ByteString)) -> s -> Enumeratee ByteString ByteString m b

Similar to concatMapM, but with a stateful step function.

Since: 0.4.11

Infinite streams

iterate :: Monad m => (Word8 -> Word8) -> Word8 -> Enumerator ByteString m b

iterate f x enumerates an infinite stream of repeated applications of f to x.

Analogous to iterate.

Since: 0.4.8

iterateM :: Monad m => (Word8 -> m Word8) -> Word8 -> Enumerator ByteString m b

Similar to iterate, except the iteration function is monadic.

Since: 0.4.8

repeat :: Monad m => Word8 -> Enumerator ByteString m b

Enumerates an infinite stream of a single byte.

Analogous to repeat.

Since: 0.4.8

repeatM :: Monad m => m Word8 -> Enumerator ByteString m b

Enumerates an infinite stream of byte. Each byte is computed by the underlying monad.

Since: 0.4.8

Bounded streams

replicate :: Monad m => Integer -> Word8 -> Enumerator ByteString m b

replicate n x enumerates a stream containing n copies of x.

Since: 0.4.8

replicateM :: Monad m => Integer -> m Word8 -> Enumerator ByteString m b

replicateM n m_x enumerates a stream of n bytes, with each byte computed by m_x.

Since: 0.4.8

generateM :: Monad m => m (Maybe Word8) -> Enumerator ByteString m b

Like repeatM, except the computation may terminate the stream by returning Nothing.

Since: 0.4.8

unfold :: Monad m => (s -> Maybe (Word8, s)) -> s -> Enumerator ByteString m b

Enumerates a stream of bytes by repeatedly applying a function to some state.

Similar to iterate.

Since: 0.4.8

unfoldM :: Monad m => (s -> m (Maybe (Word8, s))) -> s -> Enumerator ByteString m b

Enumerates a stream of bytes by repeatedly applying a computation to some state.

Similar to iterateM.

Since: 0.4.8

Dropping input

drop :: Monad m => Integer -> Iteratee ByteString m ()

drop n ignores n bytes of input from the stream.

Since: 0.4.5

dropWhile :: Monad m => (Word8 -> Bool) -> Iteratee ByteString m ()

dropWhile p ignores input from the stream until the first byte which does not match the predicate.

Since: 0.4.5

filter :: Monad m => (Word8 -> Bool) -> Enumeratee ByteString ByteString m b

Applies a predicate to the stream. The inner iteratee only receives characters for which the predicate is True.

Since: 0.4.8

filterM :: Monad m => (Word8 -> m Bool) -> Enumeratee ByteString ByteString m b

Applies a monadic predicate to the stream. The inner iteratee only receives bytes for which the predicate returns True.

Since: 0.4.8

Consumers

head :: Monad m => Iteratee ByteString m (Maybe Word8)

Get the next byte from the stream, or Nothing if the stream has ended.

Since: 0.4.5

head_ :: Monad m => Iteratee ByteString m Word8

Get the next element from the stream, or raise an error if the stream has ended.

Since: 0.4.14

take :: Monad m => Integer -> Iteratee ByteString m ByteString

take n extracts the next n bytes from the stream, as a lazy ByteString.

Since: 0.4.5

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

takeWhile p extracts input from the stream until the first byte which does not match the predicate.

Since: 0.4.5

consume :: Monad m => Iteratee ByteString m ByteString

consume = takeWhile (const True)

Since: 0.4.5

Zipping

zip :: Monad m => Iteratee ByteString m b1 -> Iteratee ByteString m b2 -> Iteratee ByteString m (b1, b2)

Pass input from a stream through two iteratees at once. Excess input is yielded if it was not consumed by either iteratee.

Analogous to zip.

Since: 0.4.14

zip3 :: Monad m => Iteratee ByteString m b1 -> Iteratee ByteString m b2 -> Iteratee ByteString m b3 -> Iteratee ByteString m (b1, b2, b3)

Pass input from a stream through three iteratees at once. Excess input is yielded if it was not consumed by any iteratee.

Analogous to zip3.

Since: 0.4.14

zip4 :: Monad m => Iteratee ByteString m b1 -> Iteratee ByteString m b2 -> Iteratee ByteString m b3 -> Iteratee ByteString m b4 -> Iteratee ByteString m (b1, b2, b3, b4)

Pass input from a stream through four iteratees at once. Excess input is yielded if it was not consumed by any iteratee.

Analogous to zip4.

Since: 0.4.14

zip5 :: Monad m => Iteratee ByteString m b1 -> Iteratee ByteString m b2 -> Iteratee ByteString m b3 -> Iteratee ByteString m b4 -> Iteratee ByteString m b5 -> Iteratee ByteString m (b1, b2, b3, b4, b5)

Pass input from a stream through five iteratees at once. Excess input is yielded if it was not consumed by any iteratee.

Analogous to zip5.

Since: 0.4.14

zip6 :: Monad m => Iteratee ByteString m b1 -> Iteratee ByteString m b2 -> Iteratee ByteString m b3 -> Iteratee ByteString m b4 -> Iteratee ByteString m b5 -> Iteratee ByteString m b6 -> Iteratee ByteString m (b1, b2, b3, b4, b5, b6)

Pass input from a stream through six iteratees at once. Excess input is yielded if it was not consumed by any iteratee.

Analogous to zip6.

Since: 0.4.14

zip7 :: Monad m => Iteratee ByteString m b1 -> Iteratee ByteString m b2 -> Iteratee ByteString m b3 -> Iteratee ByteString m b4 -> Iteratee ByteString m b5 -> Iteratee ByteString m b6 -> Iteratee ByteString m b7 -> Iteratee ByteString m (b1, b2, b3, b4, b5, b6, b7)

Pass input from a stream through seven iteratees at once. Excess input is yielded if it was not consumed by any iteratee.

Analogous to zip7.

Since: 0.4.14

zipWith :: Monad m => (b1 -> b2 -> c) -> Iteratee ByteString m b1 -> Iteratee ByteString m b2 -> Iteratee ByteString m c