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<title>src/Data/Text/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-comment'>{-# LANGUAGE TypeSynonymInstances #-}</span>
<a name="line-5"></a>
<a name="line-6"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 710</span>
<a name="line-7"></a><span class='hs-comment'>{-# LANGUAGE ViewPatterns #-}</span>
<a name="line-8"></a><span class='hs-comment'>{-# LANGUAGE PatternSynonyms #-}</span>
<a name="line-9"></a><span class='hs-cpp'>#endif</span>
<a name="line-10"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-11"></a><span class='hs-comment'>-- |</span>
<a name="line-12"></a><span class='hs-comment'>-- Module : Data.Text.Lens</span>
<a name="line-13"></a><span class='hs-comment'>-- Copyright : (C) 2012-16 Edward Kmett</span>
<a name="line-14"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-15"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-16"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-17"></a><span class='hs-comment'>-- Portability : non-portable</span>
<a name="line-18"></a><span class='hs-comment'>--</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'>Text</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-conid'>IsText</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unpacked</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_Text</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-cpp'>#if __GLASGOW_HASKELL__ >= 710</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'>Getter</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'>Review</span>
<a name="line-33"></a><span class='hs-cpp'>#endif</span>
<a name="line-34"></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-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'>Traversal</span>
<a name="line-36"></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-keyword'>as</span> <span class='hs-conid'>Strict</span>
<a name="line-37"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</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'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Strict</span>
<a name="line-38"></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'>Lazy</span>
<a name="line-39"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</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> <span class='hs-keyword'>as</span> <span class='hs-conid'>Lazy</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'>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-41"></a>
<a name="line-42"></a><span class='hs-comment'>-- $setup</span>
<a name="line-43"></a><span class='hs-comment'>-- >>> import Control.Lens</span>
<a name="line-44"></a>
<a name="line-45"></a><a name="IsText"></a><span class='hs-comment'>-- | Traversals for strict or lazy 'Text'</span>
<a name="line-46"></a><a name="IsText"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>IsText</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>where</span>
<a name="line-47"></a> <span class='hs-comment'>-- | This isomorphism can be used to 'pack' (or 'unpack') strict or lazy 'Text'.</span>
<a name="line-48"></a> <span class='hs-comment'>--</span>
<a name="line-49"></a> <span class='hs-comment'>-- @</span>
<a name="line-50"></a> <span class='hs-comment'>-- 'pack' x ≡ x '^.' 'packed'</span>
<a name="line-51"></a> <span class='hs-comment'>-- 'unpack' x ≡ x '^.' 'from' 'packed'</span>
<a name="line-52"></a> <span class='hs-comment'>-- 'packed' ≡ 'from' 'unpacked'</span>
<a name="line-53"></a> <span class='hs-comment'>-- @</span>
<a name="line-54"></a> <span class='hs-varid'>packed</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso'</span> <span class='hs-conid'>String</span> <span class='hs-varid'>t</span>
<a name="line-55"></a>
<a name="line-56"></a> <span class='hs-comment'>-- | Convert between strict or lazy 'Text' and a 'Builder'.</span>
<a name="line-57"></a> <span class='hs-comment'>--</span>
<a name="line-58"></a> <span class='hs-comment'>-- @</span>
<a name="line-59"></a> <span class='hs-comment'>-- 'fromText' x ≡ x '^.' 'builder'</span>
<a name="line-60"></a> <span class='hs-comment'>-- @</span>
<a name="line-61"></a> <span class='hs-varid'>builder</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso'</span> <span class='hs-varid'>t</span> <span class='hs-conid'>Builder</span>
<a name="line-62"></a>
<a name="line-63"></a> <span class='hs-comment'>-- | Traverse the individual characters in strict or lazy 'Text'.</span>
<a name="line-64"></a> <span class='hs-comment'>--</span>
<a name="line-65"></a> <span class='hs-comment'>-- @</span>
<a name="line-66"></a> <span class='hs-comment'>-- 'text' = 'unpacked' . 'traversed'</span>
<a name="line-67"></a> <span class='hs-comment'>-- @</span>
<a name="line-68"></a> <span class='hs-varid'>text</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IndexedTraversal'</span> <span class='hs-conid'>Int</span> <span class='hs-varid'>t</span> <span class='hs-conid'>Char</span>
<a name="line-69"></a> <span class='hs-varid'>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-70"></a> <span class='hs-comment'>{-# INLINE text #-}</span>
<a name="line-71"></a>
<a name="line-72"></a><a name="instance%20IsText%20String"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>IsText</span> <span class='hs-conid'>String</span> <span class='hs-keyword'>where</span>
<a name="line-73"></a> <span class='hs-varid'>packed</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>id</span>
<a name="line-74"></a> <span class='hs-comment'>{-# INLINE packed #-}</span>
<a name="line-75"></a> <span class='hs-varid'>text</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>traversed</span>
<a name="line-76"></a> <span class='hs-comment'>{-# INLINE text #-}</span>
<a name="line-77"></a> <span class='hs-varid'>builder</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-varid'>packed</span> <span class='hs-varop'>.</span> <span class='hs-varid'>builder</span>
<a name="line-78"></a> <span class='hs-comment'>{-# INLINE builder #-}</span>
<a name="line-79"></a>
<a name="line-80"></a><a name="unpacked"></a><span class='hs-comment'>-- | This isomorphism can be used to 'unpack' (or 'pack') both strict or lazy 'Text'.</span>
<a name="line-81"></a><span class='hs-comment'>--</span>
<a name="line-82"></a><span class='hs-comment'>-- @</span>
<a name="line-83"></a><span class='hs-comment'>-- 'unpack' x ≡ x '^.' 'unpacked'</span>
<a name="line-84"></a><span class='hs-comment'>-- 'pack' x ≡ x '^.' 'from' 'unpacked'</span>
<a name="line-85"></a><span class='hs-comment'>-- @</span>
<a name="line-86"></a><span class='hs-comment'>--</span>
<a name="line-87"></a><span class='hs-comment'>-- This 'Iso' is provided for notational convenience rather than out of great need, since</span>
<a name="line-88"></a><span class='hs-comment'>--</span>
<a name="line-89"></a><span class='hs-comment'>-- @</span>
<a name="line-90"></a><span class='hs-comment'>-- 'unpacked' ≡ 'from' 'packed'</span>
<a name="line-91"></a><span class='hs-comment'>-- @</span>
<a name="line-92"></a><span class='hs-comment'>--</span>
<a name="line-93"></a><span class='hs-definition'>unpacked</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IsText</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Iso'</span> <span class='hs-varid'>t</span> <span class='hs-conid'>String</span>
<a name="line-94"></a><span class='hs-definition'>unpacked</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>from</span> <span class='hs-varid'>packed</span>
<a name="line-95"></a><span class='hs-comment'>{-# INLINE unpacked #-}</span>
<a name="line-96"></a>
<a name="line-97"></a><span class='hs-comment'>-- | This is an alias for 'unpacked' that makes it clearer how to use it with @('#')@.</span>
<a name="line-98"></a><span class='hs-comment'>--</span>
<a name="line-99"></a><span class='hs-comment'>-- @</span>
<a name="line-100"></a><span class='hs-comment'>-- '_Text' = 'from' 'packed'</span>
<a name="line-101"></a><span class='hs-comment'>-- @</span>
<a name="line-102"></a><span class='hs-comment'>--</span>
<a name="line-103"></a><span class='hs-comment'>-- >>> _Text # "hello" :: Strict.Text</span>
<a name="line-104"></a><span class='hs-comment'>-- "hello"</span>
<a name="line-105"></a><span class='hs-sel'>_Text</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IsText</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Iso'</span> <span class='hs-varid'>t</span> <span class='hs-conid'>String</span>
<a name="line-106"></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-107"></a><span class='hs-comment'>{-# INLINE _Text #-}</span>
<a name="line-108"></a>
<a name="line-109"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 710</span>
<a name="line-110"></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-111"></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-112"></a><span class='hs-cpp'>#endif</span>
<a name="line-113"></a>
<a name="line-114"></a><a name="instance%20IsText%20Strict.Text"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>IsText</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span> <span class='hs-keyword'>where</span>
<a name="line-115"></a> <span class='hs-varid'>packed</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-varid'>packed</span>
<a name="line-116"></a> <span class='hs-comment'>{-# INLINE packed #-}</span>
<a name="line-117"></a> <span class='hs-varid'>builder</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-varid'>builder</span>
<a name="line-118"></a> <span class='hs-comment'>{-# INLINE builder #-}</span>
<a name="line-119"></a> <span class='hs-varid'>text</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-varid'>text</span>
<a name="line-120"></a> <span class='hs-comment'>{-# INLINE text #-}</span>
<a name="line-121"></a>
<a name="line-122"></a><a name="instance%20IsText%20Lazy.Text"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>IsText</span> <span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span> <span class='hs-keyword'>where</span>
<a name="line-123"></a> <span class='hs-varid'>packed</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-varid'>packed</span>
<a name="line-124"></a> <span class='hs-comment'>{-# INLINE packed #-}</span>
<a name="line-125"></a> <span class='hs-varid'>builder</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-varid'>builder</span>
<a name="line-126"></a> <span class='hs-comment'>{-# INLINE builder #-}</span>
<a name="line-127"></a> <span class='hs-varid'>text</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-varid'>text</span>
<a name="line-128"></a> <span class='hs-comment'>{-# INLINE text #-}</span>
<a name="line-129"></a>
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