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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE BangPatterns #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE Rank2Types #-}</span>
<a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE TypeOperators #-}</span>
<a name="line-5"></a><span class='hs-comment'>{-# LANGUAGE FlexibleContexts #-}</span>
<a name="line-6"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-7"></a><span class='hs-comment'>-- |</span>
<a name="line-8"></a><span class='hs-comment'>-- Module : GHC.Generics.Lens</span>
<a name="line-9"></a><span class='hs-comment'>-- Copyright : (C) 2012-15 Edward Kmett</span>
<a name="line-10"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-11"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-12"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-13"></a><span class='hs-comment'>-- Portability : GHC</span>
<a name="line-14"></a><span class='hs-comment'>--</span>
<a name="line-15"></a><span class='hs-comment'>-- Note: @GHC.Generics@ exports a number of names that collide with @Control.Lens@.</span>
<a name="line-16"></a><span class='hs-comment'>--</span>
<a name="line-17"></a><span class='hs-comment'>-- You can use hiding or imports to mitigate this to an extent, and the following imports,</span>
<a name="line-18"></a><span class='hs-comment'>-- represent a fair compromise for user code:</span>
<a name="line-19"></a><span class='hs-comment'>--</span>
<a name="line-20"></a><span class='hs-comment'>-- > import Control.Lens hiding (Rep)</span>
<a name="line-21"></a><span class='hs-comment'>-- > import GHC.Generics hiding (from, to)</span>
<a name="line-22"></a><span class='hs-comment'>--</span>
<a name="line-23"></a><span class='hs-comment'>-- You can use 'generic' to replace 'GHC.Generics.from' and 'GHC.Generics.to' from @GHC.Generics@,</span>
<a name="line-24"></a><span class='hs-comment'>-- and probably won't be explicitly referencing 'Control.Lens.Representable.Rep' from @Control.Lens@</span>
<a name="line-25"></a><span class='hs-comment'>-- in code that uses generics.</span>
<a name="line-26"></a><span class='hs-comment'>--</span>
<a name="line-27"></a><span class='hs-comment'>-- This module provides compatibility with older GHC versions by using the</span>
<a name="line-28"></a><span class='hs-comment'>-- <<a href="http://hackage.haskell.org/package/generic-deriving">http://hackage.haskell.org/package/generic-deriving</a> generic-deriving></span>
<a name="line-29"></a><span class='hs-comment'>-- package.</span>
<a name="line-30"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-31"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Generics</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-32"></a> <span class='hs-layout'>(</span> <span class='hs-keyword'>module</span> <span class='hs-conid'>Generics</span><span class='hs-varop'>.</span><span class='hs-conid'>Deriving</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-33"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_V1</span>
<a name="line-34"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_U1</span>
<a name="line-35"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_Par1</span>
<a name="line-36"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_Rec1</span>
<a name="line-37"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_K1</span>
<a name="line-38"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_M1</span>
<a name="line-39"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_L1</span>
<a name="line-40"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_R1</span>
<a name="line-41"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-42"></a>
<a name="line-43"></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-44"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Generics</span><span class='hs-varop'>.</span><span class='hs-conid'>Deriving</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-45"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Generics</span>
<a name="line-46"></a>
<a name="line-47"></a><span class='hs-sel'>_V1</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Over</span> <span class='hs-varid'>p</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>V1</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>V1</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span>
<a name="line-48"></a><span class='hs-sel'>_V1</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>absurd</span> <span class='hs-keyword'>where</span>
<a name="line-49"></a> <span class='hs-varid'>absurd</span> <span class='hs-varop'>!</span><span class='hs-sel'>_a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>undefined</span>
<a name="line-50"></a><span class='hs-comment'>{-# INLINE _V1 #-}</span>
<a name="line-51"></a>
<a name="line-52"></a><span class='hs-sel'>_U1</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso</span> <span class='hs-layout'>(</span><span class='hs-conid'>U1</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>U1</span> <span class='hs-varid'>q</span><span class='hs-layout'>)</span> <span class='hs-conid'>()</span> <span class='hs-conid'>()</span>
<a name="line-53"></a><span class='hs-sel'>_U1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iso</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-conid'>U1</span><span class='hs-layout'>)</span>
<a name="line-54"></a><span class='hs-comment'>{-# INLINE _U1 #-}</span>
<a name="line-55"></a>
<a name="line-56"></a><span class='hs-sel'>_Par1</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso</span> <span class='hs-layout'>(</span><span class='hs-conid'>Par1</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Par1</span> <span class='hs-varid'>q</span><span class='hs-layout'>)</span> <span class='hs-varid'>p</span> <span class='hs-varid'>q</span>
<a name="line-57"></a><span class='hs-sel'>_Par1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iso</span> <span class='hs-varid'>unPar1</span> <span class='hs-conid'>Par1</span>
<a name="line-58"></a><span class='hs-comment'>{-# INLINE _Par1 #-}</span>
<a name="line-59"></a>
<a name="line-60"></a><span class='hs-sel'>_Rec1</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rec1</span> <span class='hs-varid'>f</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rec1</span> <span class='hs-varid'>g</span> <span class='hs-varid'>q</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>g</span> <span class='hs-varid'>q</span><span class='hs-layout'>)</span>
<a name="line-61"></a><span class='hs-sel'>_Rec1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iso</span> <span class='hs-varid'>unRec1</span> <span class='hs-conid'>Rec1</span>
<a name="line-62"></a><span class='hs-comment'>{-# INLINE _Rec1 #-}</span>
<a name="line-63"></a>
<a name="line-64"></a><span class='hs-sel'>_K1</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso</span> <span class='hs-layout'>(</span><span class='hs-conid'>K1</span> <span class='hs-varid'>i</span> <span class='hs-varid'>c</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>K1</span> <span class='hs-varid'>j</span> <span class='hs-varid'>d</span> <span class='hs-varid'>q</span><span class='hs-layout'>)</span> <span class='hs-varid'>c</span> <span class='hs-varid'>d</span>
<a name="line-65"></a><span class='hs-sel'>_K1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iso</span> <span class='hs-varid'>unK1</span> <span class='hs-conid'>K1</span>
<a name="line-66"></a><span class='hs-comment'>{-# INLINE _K1 #-}</span>
<a name="line-67"></a>
<a name="line-68"></a><span class='hs-sel'>_M1</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Iso</span> <span class='hs-layout'>(</span><span class='hs-conid'>M1</span> <span class='hs-varid'>i</span> <span class='hs-varid'>c</span> <span class='hs-varid'>f</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>M1</span> <span class='hs-varid'>j</span> <span class='hs-varid'>d</span> <span class='hs-varid'>g</span> <span class='hs-varid'>q</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>g</span> <span class='hs-varid'>q</span><span class='hs-layout'>)</span>
<a name="line-69"></a><span class='hs-sel'>_M1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iso</span> <span class='hs-varid'>unM1</span> <span class='hs-conid'>M1</span>
<a name="line-70"></a><span class='hs-comment'>{-# INLINE _M1 #-}</span>
<a name="line-71"></a>
<a name="line-72"></a><span class='hs-sel'>_L1</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Prism'</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-conop'>:+:</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-73"></a><span class='hs-sel'>_L1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>prism</span> <span class='hs-varid'>remitter</span> <span class='hs-varid'>reviewer</span>
<a name="line-74"></a> <span class='hs-keyword'>where</span>
<a name="line-75"></a> <span class='hs-varid'>remitter</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>L1</span>
<a name="line-76"></a> <span class='hs-varid'>reviewer</span> <span class='hs-layout'>(</span><span class='hs-conid'>L1</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>l</span>
<a name="line-77"></a> <span class='hs-varid'>reviewer</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>x</span>
<a name="line-78"></a><span class='hs-comment'>{-# INLINE _L1 #-}</span>
<a name="line-79"></a>
<a name="line-80"></a><span class='hs-comment'>-- | You can access fields of `data (f :*: g) p` by using it's `Field1` and `Field2` instances</span>
<a name="line-81"></a>
<a name="line-82"></a><span class='hs-sel'>_R1</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Prism'</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-conop'>:+:</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>g</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-83"></a><span class='hs-sel'>_R1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>prism</span> <span class='hs-varid'>remitter</span> <span class='hs-varid'>reviewer</span>
<a name="line-84"></a> <span class='hs-keyword'>where</span>
<a name="line-85"></a> <span class='hs-varid'>remitter</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>R1</span>
<a name="line-86"></a> <span class='hs-varid'>reviewer</span> <span class='hs-layout'>(</span><span class='hs-conid'>R1</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>l</span>
<a name="line-87"></a> <span class='hs-varid'>reviewer</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>x</span>
<a name="line-88"></a><span class='hs-comment'>{-# INLINE _R1 #-}</span>
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