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<title>src/Data/Text/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><span class='hs-comment'>{-# LANGUAGE FlexibleInstances #-}</span>
<a name="line-4"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 710</span>
<a name="line-5"></a><span class='hs-comment'>{-# LANGUAGE PatternSynonyms #-}</span>
<a name="line-6"></a><span class='hs-comment'>{-# LANGUAGE ViewPatterns #-}</span>
<a name="line-7"></a><span class='hs-cpp'>#endif</span>
<a name="line-8"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-9"></a><span class='hs-comment'>-- |</span>
<a name="line-10"></a><span class='hs-comment'>-- Module : Data.Text.Lazy.Lens</span>
<a name="line-11"></a><span class='hs-comment'>-- Copyright : (C) 2012-2016 Edward Kmett</span>
<a name="line-12"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-13"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-14"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-15"></a><span class='hs-comment'>-- Portability : non-portable</span>
<a name="line-16"></a><span class='hs-comment'>--</span>
<a name="line-17"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-18"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</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-19"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>packed</span><span class='hs-layout'>,</span> <span class='hs-varid'>unpacked</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_Text</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>text</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>builder</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>utf8</span>
<a name="line-24"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 710</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>pattern</span> <span class='hs-conid'>Text</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><span class='hs-varop'>.</span><span class='hs-conid'>Type</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'>Getter</span>
<a name="line-31"></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'>Fold</span>
<a name="line-32"></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'>Iso</span>
<a name="line-33"></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'>Prism</span>
<a name="line-34"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 710</span>
<a name="line-35"></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'>Review</span>
<a name="line-36"></a><span class='hs-cpp'>#endif</span>
<a name="line-37"></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'>Setter</span>
<a name="line-38"></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'>Traversal</span>
<a name="line-39"></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'>ByteString</span>
<a name="line-40"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span>
<a name="line-41"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Text</span>
<a name="line-42"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>Builder</span>
<a name="line-43"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>Encoding</span>
<a name="line-44"></a>
<a name="line-45"></a><span class='hs-comment'>-- $setup</span>
<a name="line-46"></a><span class='hs-comment'>-- >>> :set -XOverloadedStrings</span>
<a name="line-47"></a><span class='hs-comment'>-- >>> import Control.Lens</span>
<a name="line-48"></a>
<a name="line-49"></a><a name="packed"></a><span class='hs-comment'>-- | This isomorphism can be used to 'pack' (or 'unpack') lazy 'Text'.</span>
<a name="line-50"></a><span class='hs-comment'>--</span>
<a name="line-51"></a><span class='hs-comment'>-- >>> "hello"^.packed -- :: Text</span>
<a name="line-52"></a><span class='hs-comment'>-- "hello"</span>
<a name="line-53"></a><span class='hs-comment'>--</span>
<a name="line-54"></a><span class='hs-comment'>-- @</span>
<a name="line-55"></a><span class='hs-comment'>-- 'pack' x ≡ x '^.' 'packed'</span>
<a name="line-56"></a><span class='hs-comment'>-- 'unpack' x ≡ x '^.' 'from' 'packed'</span>
<a name="line-57"></a><span class='hs-comment'>-- 'packed' ≡ 'from' 'unpacked'</span>
<a name="line-58"></a><span class='hs-comment'>-- @</span>
<a name="line-59"></a><span class='hs-definition'>packed</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso'</span> <span class='hs-conid'>String</span> <span class='hs-conid'>Text</span>
<a name="line-60"></a><span class='hs-definition'>packed</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iso</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-varid'>unpack</span>
<a name="line-61"></a><span class='hs-comment'>{-# INLINE packed #-}</span>
<a name="line-62"></a>
<a name="line-63"></a><a name="unpacked"></a><span class='hs-comment'>-- | This isomorphism can be used to 'unpack' (or 'pack') lazy 'Text'.</span>
<a name="line-64"></a><span class='hs-comment'>--</span>
<a name="line-65"></a><span class='hs-comment'>-- >>> "hello"^.unpacked -- :: String</span>
<a name="line-66"></a><span class='hs-comment'>-- "hello"</span>
<a name="line-67"></a><span class='hs-comment'>--</span>
<a name="line-68"></a><span class='hs-comment'>-- @</span>
<a name="line-69"></a><span class='hs-comment'>-- 'pack' x ≡ x '^.' 'from' 'unpacked'</span>
<a name="line-70"></a><span class='hs-comment'>-- 'unpack' x ≡ x '^.' 'packed'</span>
<a name="line-71"></a><span class='hs-comment'>-- @</span>
<a name="line-72"></a><span class='hs-comment'>--</span>
<a name="line-73"></a><span class='hs-comment'>-- This 'Iso' is provided for notational convenience rather than out of great need, since</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'>-- 'unpacked' ≡ 'from' 'packed'</span>
<a name="line-77"></a><span class='hs-comment'>-- @</span>
<a name="line-78"></a><span class='hs-definition'>unpacked</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso'</span> <span class='hs-conid'>Text</span> <span class='hs-conid'>String</span>
<a name="line-79"></a><span class='hs-definition'>unpacked</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iso</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-varid'>unpack</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span>
<a name="line-80"></a><span class='hs-comment'>{-# INLINE unpacked #-}</span>
<a name="line-81"></a>
<a name="line-82"></a><span class='hs-comment'>-- | This is an alias for 'unpacked' that makes it clearer how to use it with @('#')@.</span>
<a name="line-83"></a><span class='hs-comment'>--</span>
<a name="line-84"></a><span class='hs-comment'>-- @</span>
<a name="line-85"></a><span class='hs-comment'>-- '_Text' = 'from' 'packed'</span>
<a name="line-86"></a><span class='hs-comment'>-- @</span>
<a name="line-87"></a><span class='hs-comment'>--</span>
<a name="line-88"></a><span class='hs-comment'>-- >>> _Text # "hello" -- :: Text</span>
<a name="line-89"></a><span class='hs-comment'>-- "hello"</span>
<a name="line-90"></a><span class='hs-sel'>_Text</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso'</span> <span class='hs-conid'>Text</span> <span class='hs-conid'>String</span>
<a name="line-91"></a><span class='hs-sel'>_Text</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>from</span> <span class='hs-varid'>packed</span>
<a name="line-92"></a><span class='hs-comment'>{-# INLINE _Text #-}</span>
<a name="line-93"></a>
<a name="line-94"></a><a name="builder"></a><span class='hs-comment'>-- | Convert between lazy 'Text' and 'Builder' .</span>
<a name="line-95"></a><span class='hs-comment'>--</span>
<a name="line-96"></a><span class='hs-comment'>-- @</span>
<a name="line-97"></a><span class='hs-comment'>-- 'fromLazyText' x ≡ x '^.' 'builder'</span>
<a name="line-98"></a><span class='hs-comment'>-- 'toLazyText' x ≡ x '^.' 'from' 'builder'</span>
<a name="line-99"></a><span class='hs-comment'>-- @</span>
<a name="line-100"></a><span class='hs-definition'>builder</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso'</span> <span class='hs-conid'>Text</span> <span class='hs-conid'>Builder</span>
<a name="line-101"></a><span class='hs-definition'>builder</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iso</span> <span class='hs-varid'>fromLazyText</span> <span class='hs-varid'>toLazyText</span>
<a name="line-102"></a><span class='hs-comment'>{-# INLINE builder #-}</span>
<a name="line-103"></a>
<a name="line-104"></a><a name="text"></a><span class='hs-comment'>-- | Traverse the individual characters in a 'Text'.</span>
<a name="line-105"></a><span class='hs-comment'>--</span>
<a name="line-106"></a><span class='hs-comment'>-- >>> anyOf text (=='c') "chello"</span>
<a name="line-107"></a><span class='hs-comment'>-- True</span>
<a name="line-108"></a><span class='hs-comment'>--</span>
<a name="line-109"></a><span class='hs-comment'>-- @</span>
<a name="line-110"></a><span class='hs-comment'>-- 'text' = 'unpacked' . 'traversed'</span>
<a name="line-111"></a><span class='hs-comment'>-- @</span>
<a name="line-112"></a><span class='hs-comment'>--</span>
<a name="line-113"></a><span class='hs-comment'>-- When the type is unambiguous, you can also use the more general 'each'.</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'>-- 'text' ≡ 'each'</span>
<a name="line-117"></a><span class='hs-comment'>-- @</span>
<a name="line-118"></a><span class='hs-comment'>--</span>
<a name="line-119"></a><span class='hs-comment'>-- Note that when just using this as a 'Setter', @'setting' 'Data.Text.Lazy.map'@</span>
<a name="line-120"></a><span class='hs-comment'>-- can be more efficient.</span>
<a name="line-121"></a><span class='hs-definition'>text</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IndexedTraversal'</span> <span class='hs-conid'>Int</span> <span class='hs-conid'>Text</span> <span class='hs-conid'>Char</span>
<a name="line-122"></a><span class='hs-definition'>text</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unpacked</span> <span class='hs-varop'>.</span> <span class='hs-varid'>traversed</span>
<a name="line-123"></a><span class='hs-comment'>{-# INLINE [0] text #-}</span>
<a name="line-124"></a>
<a name="line-125"></a><span class='hs-comment'>{-# RULES
<a name="line-126"></a>"lazy text -> map" text = sets Text.map :: ASetter' Text Char;
<a name="line-127"></a>"lazy text -> imap" text = isets imapLazy :: AnIndexedSetter' Int Text Char;
<a name="line-128"></a>"lazy text -> foldr" text = foldring Text.foldr :: Getting (Endo r) Text Char;
<a name="line-129"></a>"lazy text -> ifoldr" text = ifoldring ifoldrLazy :: IndexedGetting Int (Endo r) Text Char;
<a name="line-130"></a> #-}</span>
<a name="line-131"></a>
<a name="line-132"></a><a name="imapLazy"></a><span class='hs-definition'>imapLazy</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-133"></a><span class='hs-definition'>imapLazy</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>snd</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-varid'>mapAccumL</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>i</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>i</span> <span class='hs-varop'>`seq`</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>f</span> <span class='hs-varid'>i</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-num'>0</span>
<a name="line-134"></a><span class='hs-comment'>{-# INLINE imapLazy #-}</span>
<a name="line-135"></a>
<a name="line-136"></a><a name="ifoldrLazy"></a><span class='hs-definition'>ifoldrLazy</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-137"></a><span class='hs-definition'>ifoldrLazy</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-varid'>x</span> <span class='hs-varid'>g</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>i</span> <span class='hs-varop'>`seq`</span> <span class='hs-varid'>f</span> <span class='hs-varid'>i</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-varid'>g</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span> <span class='hs-num'>0</span>
<a name="line-138"></a><span class='hs-comment'>{-# INLINE ifoldrLazy #-}</span>
<a name="line-139"></a>
<a name="line-140"></a><a name="utf8"></a><span class='hs-comment'>-- | Encode\/Decode a lazy 'Text' to\/from lazy 'ByteString', via UTF-8.</span>
<a name="line-141"></a><span class='hs-comment'>--</span>
<a name="line-142"></a><span class='hs-comment'>-- Note: This function does not decode lazily, as it must consume the entire</span>
<a name="line-143"></a><span class='hs-comment'>-- input before deciding whether or not it fails.</span>
<a name="line-144"></a><span class='hs-comment'>--</span>
<a name="line-145"></a><span class='hs-comment'>-- >>> ByteString.unpack (utf8 # "☃")</span>
<a name="line-146"></a><span class='hs-comment'>-- [226,152,131]</span>
<a name="line-147"></a><span class='hs-definition'>utf8</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Prism'</span> <span class='hs-conid'>ByteString</span> <span class='hs-conid'>Text</span>
<a name="line-148"></a><span class='hs-definition'>utf8</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>prism'</span> <span class='hs-varid'>encodeUtf8</span> <span class='hs-layout'>(</span><span class='hs-varid'>preview</span> <span class='hs-sel'>_Right</span> <span class='hs-varop'>.</span> <span class='hs-varid'>decodeUtf8'</span><span class='hs-layout'>)</span>
<a name="line-149"></a><span class='hs-comment'>{-# INLINE utf8 #-}</span>
<a name="line-150"></a>
<a name="line-151"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 710</span>
<a name="line-152"></a><a name="pattern"></a><span class='hs-definition'>pattern</span> <span class='hs-conid'>Text</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-layout'>(</span><span class='hs-varid'>view</span> <span class='hs-sel'>_Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-153"></a> <span class='hs-conid'>Text</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>review</span> <span class='hs-sel'>_Text</span> <span class='hs-varid'>a</span>
<a name="line-154"></a><span class='hs-cpp'>#endif</span>
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