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<title>src/Control/Lens/Internal/Prism.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'>-----------------------------------------------------------------------------</span>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : Control.Lens.Internal.Prism</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (C) 2012-2016 Edward Kmett</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-8"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : non-portable</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-keyword'>module</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'>Prism</span>
<a name="line-13"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>Market</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-14"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Market'</span>
<a name="line-15"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-16"></a>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Profunctor</span>
<a name="line-18"></a><span class='hs-cpp'>#ifndef SAFE</span>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Profunctor</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span>
<a name="line-20"></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'>Coerce</span>
<a name="line-21"></a><span class='hs-cpp'>#endif</span>
<a name="line-22"></a>
<a name="line-23"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-24"></a><span class='hs-comment'>-- Prism: Market</span>
<a name="line-25"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-26"></a>
<a name="line-27"></a><a name="Market"></a><span class='hs-comment'>-- | This type is used internally by the 'Control.Lens.Prism.Prism' code to</span>
<a name="line-28"></a><a name="Market"></a><span class='hs-comment'>-- provide efficient access to the two parts of a 'Prism'.</span>
<a name="line-29"></a><a name="Market"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Market</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Market</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Either</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-30"></a>
<a name="line-31"></a><a name="Market'"></a><span class='hs-comment'>-- | @type 'Market'' a s t = 'Market' a a s t@</span>
<a name="line-32"></a><a name="Market'"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Market'</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Market</span> <span class='hs-varid'>a</span> <span class='hs-varid'>a</span>
<a name="line-33"></a>
<a name="line-34"></a><a name="instance%20Functor%20(Market%20a%20b%20s)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-layout'>(</span><span class='hs-conid'>Market</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-35"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Market</span> <span class='hs-varid'>bt</span> <span class='hs-varid'>seta</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Market</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-varid'>bt</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>either</span> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-conid'>Right</span> <span class='hs-varop'>.</span> <span class='hs-varid'>seta</span><span class='hs-layout'>)</span>
<a name="line-36"></a> <span class='hs-comment'>{-# INLINE fmap #-}</span>
<a name="line-37"></a>
<a name="line-38"></a><a name="instance%20Profunctor%20(Market%20a%20b)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Profunctor</span> <span class='hs-layout'>(</span><span class='hs-conid'>Market</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-39"></a> <span class='hs-varid'>dimap</span> <span class='hs-varid'>f</span> <span class='hs-varid'>g</span> <span class='hs-layout'>(</span><span class='hs-conid'>Market</span> <span class='hs-varid'>bt</span> <span class='hs-varid'>seta</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Market</span> <span class='hs-layout'>(</span><span class='hs-varid'>g</span> <span class='hs-varop'>.</span> <span class='hs-varid'>bt</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>either</span> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-varop'>.</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-conid'>Right</span> <span class='hs-varop'>.</span> <span class='hs-varid'>seta</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-40"></a> <span class='hs-comment'>{-# INLINE dimap #-}</span>
<a name="line-41"></a> <span class='hs-varid'>lmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Market</span> <span class='hs-varid'>bt</span> <span class='hs-varid'>seta</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Market</span> <span class='hs-varid'>bt</span> <span class='hs-layout'>(</span><span class='hs-varid'>seta</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-42"></a> <span class='hs-comment'>{-# INLINE lmap #-}</span>
<a name="line-43"></a> <span class='hs-varid'>rmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Market</span> <span class='hs-varid'>bt</span> <span class='hs-varid'>seta</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Market</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-varid'>bt</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>either</span> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-conid'>Right</span> <span class='hs-varop'>.</span> <span class='hs-varid'>seta</span><span class='hs-layout'>)</span>
<a name="line-44"></a> <span class='hs-comment'>{-# INLINE rmap #-}</span>
<a name="line-45"></a>
<a name="line-46"></a><span class='hs-cpp'>#ifndef SAFE</span>
<a name="line-47"></a> <span class='hs-layout'>(</span> <span class='hs-cpp'>#.</span> <span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>coerce'</span>
<a name="line-48"></a> <span class='hs-comment'>{-# INLINE ( #. ) #-}</span>
<a name="line-49"></a> <span class='hs-layout'>(</span> <span class='hs-varop'>.#</span> <span class='hs-layout'>)</span> <span class='hs-varid'>p</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>coerce</span> <span class='hs-varid'>p</span>
<a name="line-50"></a> <span class='hs-comment'>{-# INLINE ( .# ) #-}</span>
<a name="line-51"></a><span class='hs-cpp'>#endif</span>
<a name="line-52"></a>
<a name="line-53"></a><a name="instance%20Choice%20(Market%20a%20b)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Choice</span> <span class='hs-layout'>(</span><span class='hs-conid'>Market</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-54"></a> <span class='hs-varid'>left'</span> <span class='hs-layout'>(</span><span class='hs-conid'>Market</span> <span class='hs-varid'>bt</span> <span class='hs-varid'>seta</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Market</span> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-varop'>.</span> <span class='hs-varid'>bt</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>sc</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>sc</span> <span class='hs-keyword'>of</span>
<a name="line-55"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>seta</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-56"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-57"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Right</span> <span class='hs-varid'>a</span>
<a name="line-58"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-59"></a> <span class='hs-comment'>{-# INLINE left' #-}</span>
<a name="line-60"></a> <span class='hs-varid'>right'</span> <span class='hs-layout'>(</span><span class='hs-conid'>Market</span> <span class='hs-varid'>bt</span> <span class='hs-varid'>seta</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Market</span> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-varop'>.</span> <span class='hs-varid'>bt</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cs</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>cs</span> <span class='hs-keyword'>of</span>
<a name="line-61"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-62"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>seta</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-63"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-64"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Right</span> <span class='hs-varid'>a</span>
<a name="line-65"></a> <span class='hs-comment'>{-# INLINE right' #-}</span>
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