Data.ByteString.Lens

Documentation

class IsByteString t where

Traversals for ByteStrings.

Minimal complete definition

packedBytes, packedChars

Methods

packedBytes :: Iso' [Word8] t

pack (or unpack) a list of bytes into a strict or lazy ByteString.

pack x ≡ x ^. packedBytes
unpack x ≡ x ^. from packedBytes
packedBytes ≡ from unpackedBytes

packedChars :: Iso' String t

pack (or unpack) a list of characters into a strict or lazy ByteString.

When writing back to the ByteString it is assumed that every Char lies between '\x00' and '\xff'.

pack x ≡ x ^. packedChars
unpack x ≡ x ^. from packedChars
packedChars ≡ from unpackedChars

bytes :: IndexedTraversal' Int t Word8

Traverse each Word8 in a strict or lazy ByteString

This Traversal walks each strict ByteString chunk in a tree-like fashion enable zippers to seek to locations more quickly and accelerate many monoidal queries, but up to associativity (and constant factors) it is equivalent to the much slower:

bytes ≡ unpackedBytes . traversed

anyOf bytes (== 0x80) :: ByteString -> Bool

chars :: IndexedTraversal' Int t Char

Traverse the individual bytes in a strict or lazy ByteString as characters.

When writing back to the ByteString it is assumed that every Char lies between '\x00' and '\xff'.

This Traversal walks each strict ByteString chunk in a tree-like fashion enable zippers to seek to locations more quickly and accelerate many monoidal queries, but up to associativity (and constant factors) it is equivalent to the much slower:

chars ≡ unpackedChars . traversed

anyOf chars (== 'c') :: ByteString -> Bool

Instances

IsByteString ByteString

IsByteString ByteString

unpackedBytes :: IsByteString t => Iso' t [Word8]

unpack (or pack) a ByteString into a list of bytes

unpackedBytes ≡ from packedBytes
unpack x ≡ x ^. unpackedBytes
pack x ≡  x ^. from unpackedBytes

unpackedBytes :: Iso' ByteString [Word8]
unpackedBytes :: Iso' ByteString [Word8]

unpackedChars :: IsByteString t => Iso' t String

unpack (or pack) a list of characters into a strict (or lazy) ByteString

When writing back to the ByteString it is assumed that every Char lies between '\x00' and '\xff'.

unpackedChars ≡ from packedChars
unpack x ≡ x ^. unpackedChars
pack x ≡ x ^. from unpackedChars

unpackedChars :: Iso' ByteString String
unpackedChars :: Iso' ByteString String