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<title>src/Data/ByteString/Lazy/Lens.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE FlexibleContexts #-}</span>
<a name="line-3"></a>
<a name="line-4"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 710</span>
<a name="line-5"></a><span class='hs-comment'>{-# LANGUAGE ViewPatterns #-}</span>
<a name="line-6"></a><span class='hs-comment'>{-# LANGUAGE PatternSynonyms #-}</span>
<a name="line-7"></a><span class='hs-cpp'>#endif</span>
<a name="line-8"></a>
<a name="line-9"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-10"></a><span class='hs-comment'>-- |</span>
<a name="line-11"></a><span class='hs-comment'>-- Module : Data.ByteString.Lazy.Lens</span>
<a name="line-12"></a><span class='hs-comment'>-- Copyright : (C) 2012-2016 Edward Kmett</span>
<a name="line-13"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-14"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-15"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-16"></a><span class='hs-comment'>-- Portability : non-portable</span>
<a name="line-17"></a><span class='hs-comment'>--</span>
<a name="line-18"></a><span class='hs-comment'>-- Lazy 'ByteString' lenses.</span>
<a name="line-19"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-20"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-21"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>packedBytes</span><span class='hs-layout'>,</span> <span class='hs-varid'>unpackedBytes</span><span class='hs-layout'>,</span> <span class='hs-varid'>bytes</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>packedChars</span><span class='hs-layout'>,</span> <span class='hs-varid'>unpackedChars</span><span class='hs-layout'>,</span> <span class='hs-varid'>chars</span>
<a name="line-23"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 710</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>pattern</span> <span class='hs-conid'>Bytes</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>pattern</span> <span class='hs-conid'>Chars</span>
<a name="line-26"></a><span class='hs-cpp'>#endif</span>
<a name="line-27"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-28"></a>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Words</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>Char8</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Char8</span>
<a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Word</span> <span class='hs-layout'>(</span><span class='hs-conid'>Word8</span><span class='hs-layout'>)</span>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>Int64</span><span class='hs-layout'>)</span>
<a name="line-35"></a>
<a name="line-36"></a><span class='hs-comment'>-- $setup</span>
<a name="line-37"></a><span class='hs-comment'>-- >>> :set -XOverloadedStrings</span>
<a name="line-38"></a><span class='hs-comment'>-- >>> import Numeric.Lens</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="packedBytes"></a><span class='hs-comment'>-- | 'Data.ByteString.Lazy.pack' (or 'Data.ByteString.Lazy.unpack') a list of bytes into a 'ByteString'.</span>
<a name="line-41"></a><span class='hs-comment'>--</span>
<a name="line-42"></a><span class='hs-comment'>-- @</span>
<a name="line-43"></a><span class='hs-comment'>-- 'packedBytes' ≡ 'from' 'unpackedBytes'</span>
<a name="line-44"></a><span class='hs-comment'>-- 'Data.ByteString.pack' x ≡ x '^.' 'packedBytes'</span>
<a name="line-45"></a><span class='hs-comment'>-- 'Data.ByteString.unpack' x ≡ x '^.' 'from' 'packedBytes'</span>
<a name="line-46"></a><span class='hs-comment'>-- @</span>
<a name="line-47"></a><span class='hs-comment'>--</span>
<a name="line-48"></a><span class='hs-comment'>-- >>> [104,101,108,108,111]^.packedBytes == Char8.pack "hello"</span>
<a name="line-49"></a><span class='hs-comment'>-- True</span>
<a name="line-50"></a><span class='hs-definition'>packedBytes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso'</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Word8</span><span class='hs-keyglyph'>]</span> <span class='hs-conid'>ByteString</span>
<a name="line-51"></a><span class='hs-definition'>packedBytes</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iso</span> <span class='hs-conid'>Words</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-varid'>unpackLazy</span>
<a name="line-52"></a><span class='hs-comment'>{-# INLINE packedBytes #-}</span>
<a name="line-53"></a>
<a name="line-54"></a><a name="unpackedBytes"></a><span class='hs-comment'>-- | 'Data.ByteString.Lazy.unpack' (or 'Data.ByteString.Lazy.pack') a 'ByteString' into a list of bytes</span>
<a name="line-55"></a><span class='hs-comment'>--</span>
<a name="line-56"></a><span class='hs-comment'>-- @</span>
<a name="line-57"></a><span class='hs-comment'>-- 'unpackedBytes' ≡ 'from' 'packedBytes'</span>
<a name="line-58"></a><span class='hs-comment'>-- 'Data.ByteString.unpack' x ≡ x '^.' 'unpackedBytes'</span>
<a name="line-59"></a><span class='hs-comment'>-- 'Data.ByteString.pack' x ≡ x '^.' 'from' 'unpackedBytes'</span>
<a name="line-60"></a><span class='hs-comment'>-- @</span>
<a name="line-61"></a><span class='hs-comment'>--</span>
<a name="line-62"></a><span class='hs-comment'>-- >>> "hello"^.packedChars.unpackedBytes</span>
<a name="line-63"></a><span class='hs-comment'>-- [104,101,108,108,111]</span>
<a name="line-64"></a><span class='hs-definition'>unpackedBytes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso'</span> <span class='hs-conid'>ByteString</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Word8</span><span class='hs-keyglyph'>]</span>
<a name="line-65"></a><span class='hs-definition'>unpackedBytes</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>from</span> <span class='hs-varid'>packedBytes</span>
<a name="line-66"></a><span class='hs-comment'>{-# INLINE unpackedBytes #-}</span>
<a name="line-67"></a>
<a name="line-68"></a><a name="bytes"></a><span class='hs-comment'>-- | Traverse the individual bytes in a 'ByteString'.</span>
<a name="line-69"></a><span class='hs-comment'>--</span>
<a name="line-70"></a><span class='hs-comment'>-- This 'Traversal' walks each strict 'ByteString' chunk in a tree-like fashion</span>
<a name="line-71"></a><span class='hs-comment'>-- enable zippers to seek to locations more quickly and accelerate</span>
<a name="line-72"></a><span class='hs-comment'>-- many monoidal queries, but up to associativity (and constant factors) it is</span>
<a name="line-73"></a><span class='hs-comment'>-- equivalent to the much slower:</span>
<a name="line-74"></a><span class='hs-comment'>--</span>
<a name="line-75"></a><span class='hs-comment'>-- @</span>
<a name="line-76"></a><span class='hs-comment'>-- 'bytes' ≡ 'unpackedBytes' '.' 'traversed'</span>
<a name="line-77"></a><span class='hs-comment'>-- @</span>
<a name="line-78"></a><span class='hs-comment'>--</span>
<a name="line-79"></a><span class='hs-comment'>-- >>> anyOf bytes (== 0x80) (Char8.pack "hello")</span>
<a name="line-80"></a><span class='hs-comment'>-- False</span>
<a name="line-81"></a><span class='hs-comment'>--</span>
<a name="line-82"></a><span class='hs-comment'>-- Note that when just using this as a 'Setter', @'setting' 'Data.ByteString.Lazy.map'@</span>
<a name="line-83"></a><span class='hs-comment'>-- can be more efficient.</span>
<a name="line-84"></a><span class='hs-definition'>bytes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IndexedTraversal'</span> <span class='hs-conid'>Int64</span> <span class='hs-conid'>ByteString</span> <span class='hs-conid'>Word8</span>
<a name="line-85"></a><span class='hs-definition'>bytes</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>traversedLazy</span>
<a name="line-86"></a><span class='hs-comment'>{-# INLINE bytes #-}</span>
<a name="line-87"></a>
<a name="line-88"></a><a name="packedChars"></a><span class='hs-comment'>-- | 'Data.ByteString.Lazy.Char8.pack' (or 'Data.ByteString.Lazy.Char8.unpack') a list of characters into a 'ByteString'.</span>
<a name="line-89"></a><span class='hs-comment'>--</span>
<a name="line-90"></a><span class='hs-comment'>-- When writing back to the 'ByteString' it is assumed that every 'Char'</span>
<a name="line-91"></a><span class='hs-comment'>-- lies between @'\x00'@ and @'\xff'@.</span>
<a name="line-92"></a><span class='hs-comment'>--</span>
<a name="line-93"></a><span class='hs-comment'>-- @</span>
<a name="line-94"></a><span class='hs-comment'>-- 'packedChars' ≡ 'from' 'unpackedChars'</span>
<a name="line-95"></a><span class='hs-comment'>-- 'Data.ByteString.Char8.pack' x ≡ x '^.' 'packedChars'</span>
<a name="line-96"></a><span class='hs-comment'>-- 'Data.ByteString.Char8.unpack' x ≡ x '^.' 'from' 'packedChars'</span>
<a name="line-97"></a><span class='hs-comment'>-- @</span>
<a name="line-98"></a><span class='hs-comment'>--</span>
<a name="line-99"></a><span class='hs-comment'>-- >>> "hello"^.packedChars.each.re (base 16 . enum).to (\x -> if Prelude.length x == 1 then '0':x else x)</span>
<a name="line-100"></a><span class='hs-comment'>-- "68656c6c6f"</span>
<a name="line-101"></a><span class='hs-definition'>packedChars</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso'</span> <span class='hs-conid'>String</span> <span class='hs-conid'>ByteString</span>
<a name="line-102"></a><span class='hs-definition'>packedChars</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iso</span> <span class='hs-conid'>Char8</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-varid'>unpackLazy8</span>
<a name="line-103"></a><span class='hs-comment'>{-# INLINE packedChars #-}</span>
<a name="line-104"></a>
<a name="line-105"></a><a name="unpackedChars"></a><span class='hs-comment'>-- | 'Data.ByteString.Lazy.Char8.unpack' (or 'Data.ByteString.Lazy.Char8.pack') a list of characters into a 'ByteString'</span>
<a name="line-106"></a><span class='hs-comment'>--</span>
<a name="line-107"></a><span class='hs-comment'>-- When writing back to the 'ByteString' it is assumed that every 'Char'</span>
<a name="line-108"></a><span class='hs-comment'>-- lies between @'\x00'@ and @'\xff'@.</span>
<a name="line-109"></a><span class='hs-comment'>--</span>
<a name="line-110"></a><span class='hs-comment'>-- @</span>
<a name="line-111"></a><span class='hs-comment'>-- 'unpackedChars' ≡ 'from' 'packedChars'</span>
<a name="line-112"></a><span class='hs-comment'>-- 'Data.ByteString.Char8.unpack' x ≡ x '^.' 'unpackedChars'</span>
<a name="line-113"></a><span class='hs-comment'>-- 'Data.ByteString.Char8.pack' x ≡ x '^.' 'from' 'unpackedChars'</span>
<a name="line-114"></a><span class='hs-comment'>-- @</span>
<a name="line-115"></a><span class='hs-comment'>--</span>
<a name="line-116"></a><span class='hs-comment'>-- >>> [104,101,108,108,111]^.packedBytes.unpackedChars</span>
<a name="line-117"></a><span class='hs-comment'>-- "hello"</span>
<a name="line-118"></a><span class='hs-definition'>unpackedChars</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso'</span> <span class='hs-conid'>ByteString</span> <span class='hs-conid'>String</span>
<a name="line-119"></a><span class='hs-definition'>unpackedChars</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>from</span> <span class='hs-varid'>packedChars</span>
<a name="line-120"></a><span class='hs-comment'>{-# INLINE unpackedChars #-}</span>
<a name="line-121"></a>
<a name="line-122"></a><a name="chars"></a><span class='hs-comment'>-- | Traverse the individual bytes in a 'ByteString' as characters.</span>
<a name="line-123"></a><span class='hs-comment'>--</span>
<a name="line-124"></a><span class='hs-comment'>-- When writing back to the 'ByteString' it is assumed that every 'Char'</span>
<a name="line-125"></a><span class='hs-comment'>-- lies between @'\x00'@ and @'\xff'@.</span>
<a name="line-126"></a><span class='hs-comment'>--</span>
<a name="line-127"></a><span class='hs-comment'>-- This 'Traversal' walks each strict 'ByteString' chunk in a tree-like fashion</span>
<a name="line-128"></a><span class='hs-comment'>-- enable zippers to seek to locations more quickly and accelerate</span>
<a name="line-129"></a><span class='hs-comment'>-- many monoidal queries, but up to associativity (and constant factors) it is</span>
<a name="line-130"></a><span class='hs-comment'>-- equivalent to:</span>
<a name="line-131"></a><span class='hs-comment'>--</span>
<a name="line-132"></a><span class='hs-comment'>-- @</span>
<a name="line-133"></a><span class='hs-comment'>-- 'chars' = 'unpackedChars' '.' 'traversed'</span>
<a name="line-134"></a><span class='hs-comment'>-- @</span>
<a name="line-135"></a><span class='hs-comment'>--</span>
<a name="line-136"></a><span class='hs-comment'>-- >>> anyOf chars (== 'h') "hello"</span>
<a name="line-137"></a><span class='hs-comment'>-- True</span>
<a name="line-138"></a><span class='hs-definition'>chars</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IndexedTraversal'</span> <span class='hs-conid'>Int64</span> <span class='hs-conid'>ByteString</span> <span class='hs-conid'>Char</span>
<a name="line-139"></a><span class='hs-definition'>chars</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>traversedLazy8</span>
<a name="line-140"></a><span class='hs-comment'>{-# INLINE chars #-}</span>
<a name="line-141"></a>
<a name="line-142"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 710</span>
<a name="line-143"></a><a name="pattern"></a><span class='hs-definition'>pattern</span> <span class='hs-conid'>Bytes</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'><-</span> <span class='hs-layout'>(</span><span class='hs-varid'>view</span> <span class='hs-varid'>unpackedBytes</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-144"></a> <span class='hs-conid'>Bytes</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>review</span> <span class='hs-varid'>unpackedBytes</span> <span class='hs-varid'>b</span>
<a name="line-145"></a>
<a name="line-146"></a><span class='hs-definition'>pattern</span> <span class='hs-conid'>Chars</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'><-</span> <span class='hs-layout'>(</span><span class='hs-varid'>view</span> <span class='hs-varid'>unpackedChars</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-147"></a> <span class='hs-conid'>Chars</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>review</span> <span class='hs-varid'>unpackedChars</span> <span class='hs-varid'>b</span>
<a name="line-148"></a><span class='hs-cpp'>#endif</span>
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