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<title>src/Data/Bifunctor/Joker.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 DeriveDataTypeable #-}</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE EmptyDataDecls #-}</span>
<a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE TypeFamilies #-}</span>
<a name="line-5"></a>
<a name="line-6"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 702</span>
<a name="line-7"></a><span class='hs-comment'>{-# LANGUAGE DeriveGeneric #-}</span>
<a name="line-8"></a><span class='hs-cpp'>#endif</span>
<a name="line-9"></a>
<a name="line-10"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 706</span>
<a name="line-11"></a><span class='hs-comment'>{-# LANGUAGE PolyKinds #-}</span>
<a name="line-12"></a><span class='hs-cpp'>#endif</span>
<a name="line-13"></a>
<a name="line-14"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 708</span>
<a name="line-15"></a><span class='hs-comment'>{-# LANGUAGE Safe #-}</span>
<a name="line-16"></a><span class='hs-cpp'>#elif __GLASGOW_HASKELL__ >= 702</span>
<a name="line-17"></a><span class='hs-comment'>{-# LANGUAGE Trustworthy #-}</span>
<a name="line-18"></a><span class='hs-cpp'>#endif</span>
<a name="line-19"></a>
<a name="line-20"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-21"></a><span class='hs-comment'>-- |</span>
<a name="line-22"></a><span class='hs-comment'>-- Copyright : (C) 2008-2016 Edward Kmett</span>
<a name="line-23"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-24"></a><span class='hs-comment'>--</span>
<a name="line-25"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-26"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-27"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-28"></a><span class='hs-comment'>--</span>
<a name="line-29"></a><span class='hs-comment'>-- From the Functional Pearl \"Clowns to the Left of me, Jokers to the Right: Dissecting Data Structures\"</span>
<a name="line-30"></a><span class='hs-comment'>-- by Conor McBride.</span>
<a name="line-31"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-32"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Bifunctor</span><span class='hs-varop'>.</span><span class='hs-conid'>Joker</span>
<a name="line-33"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>Joker</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-34"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-35"></a>
<a name="line-36"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ < 710</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'>Applicative</span>
<a name="line-38"></a><span class='hs-cpp'>#endif</span>
<a name="line-39"></a>
<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'>Biapplicative</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'>Bifoldable</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'>Bitraversable</span>
<a name="line-43"></a>
<a name="line-44"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ < 710</span>
<a name="line-45"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Foldable</span>
<a name="line-46"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Traversable</span>
<a name="line-47"></a><span class='hs-cpp'>#endif</span>
<a name="line-48"></a>
<a name="line-49"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 708</span>
<a name="line-50"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Typeable</span>
<a name="line-51"></a><span class='hs-cpp'>#endif</span>
<a name="line-52"></a>
<a name="line-53"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 702</span>
<a name="line-54"></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-55"></a><span class='hs-cpp'>#endif</span>
<a name="line-56"></a>
<a name="line-57"></a><a name="Joker"></a><span class='hs-comment'>-- | Make a 'Functor' over the second argument of a 'Bifunctor'.</span>
<a name="line-58"></a><a name="Joker"></a><span class='hs-comment'>--</span>
<a name="line-59"></a><a name="Joker"></a><span class='hs-comment'>-- Mnemonic: C__l__owns to the __l__eft (parameter of the Bifunctor),</span>
<a name="line-60"></a><a name="Joker"></a><span class='hs-comment'>-- joke__r__s to the __r__ight.</span>
<a name="line-61"></a><a name="Joker"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>Joker</span> <span class='hs-varid'>g</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Joker</span> <span class='hs-layout'>{</span> <span class='hs-varid'>runJoker</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>g</span> <span class='hs-varid'>b</span> <span class='hs-layout'>}</span>
<a name="line-62"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Read</span>
<a name="line-63"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 702</span>
<a name="line-64"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Generic</span>
<a name="line-65"></a><span class='hs-cpp'>#endif</span>
<a name="line-66"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 708</span>
<a name="line-67"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Generic1</span>
<a name="line-68"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span>
<a name="line-69"></a><span class='hs-cpp'>#endif</span>
<a name="line-70"></a> <span class='hs-layout'>)</span>
<a name="line-71"></a>
<a name="line-72"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 702 && __GLASGOW_HASKELL__ < 708</span>
<a name="line-73"></a><a name="JokerMetaData"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>JokerMetaData</span>
<a name="line-74"></a><a name="JokerMetaCons"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>JokerMetaCons</span>
<a name="line-75"></a><a name="JokerMetaSel"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>JokerMetaSel</span>
<a name="line-76"></a>
<a name="line-77"></a><a name="instance%20Datatype%20JokerMetaData"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Datatype</span> <span class='hs-conid'>JokerMetaData</span> <span class='hs-keyword'>where</span>
<a name="line-78"></a> <span class='hs-varid'>datatypeName</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Joker"</span>
<a name="line-79"></a> <span class='hs-varid'>moduleName</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Data.Bifunctor.Joker"</span>
<a name="line-80"></a>
<a name="line-81"></a><a name="instance%20Constructor%20JokerMetaCons"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Constructor</span> <span class='hs-conid'>JokerMetaCons</span> <span class='hs-keyword'>where</span>
<a name="line-82"></a> <span class='hs-varid'>conName</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Joker"</span>
<a name="line-83"></a> <span class='hs-varid'>conIsRecord</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-84"></a>
<a name="line-85"></a><a name="instance%20Selector%20JokerMetaSel"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Selector</span> <span class='hs-conid'>JokerMetaSel</span> <span class='hs-keyword'>where</span>
<a name="line-86"></a> <span class='hs-varid'>selName</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"runJoker"</span>
<a name="line-87"></a>
<a name="line-88"></a><a name="instance%20Generic1%20(Joker%20g%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Generic1</span> <span class='hs-layout'>(</span><span class='hs-conid'>Joker</span> <span class='hs-varid'>g</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-89"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>Rep1</span> <span class='hs-layout'>(</span><span class='hs-conid'>Joker</span> <span class='hs-varid'>g</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>D1</span> <span class='hs-conid'>JokerMetaData</span> <span class='hs-layout'>(</span><span class='hs-conid'>C1</span> <span class='hs-conid'>JokerMetaCons</span>
<a name="line-90"></a> <span class='hs-layout'>(</span><span class='hs-conid'>S1</span> <span class='hs-conid'>JokerMetaSel</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rec1</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-91"></a> <span class='hs-varid'>from1</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>M1</span> <span class='hs-varop'>.</span> <span class='hs-conid'>M1</span> <span class='hs-varop'>.</span> <span class='hs-conid'>M1</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Rec1</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runJoker</span>
<a name="line-92"></a> <span class='hs-varid'>to1</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Joker</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unRec1</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unM1</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unM1</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unM1</span>
<a name="line-93"></a><span class='hs-cpp'>#endif</span>
<a name="line-94"></a>
<a name="line-95"></a><a name="instance%20Bifunctor%20(Joker%20g)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Bifunctor</span> <span class='hs-layout'>(</span><span class='hs-conid'>Joker</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-96"></a> <span class='hs-varid'>first</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Joker</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runJoker</span>
<a name="line-97"></a> <span class='hs-comment'>{-# INLINE first #-}</span>
<a name="line-98"></a> <span class='hs-varid'>second</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Joker</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>g</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runJoker</span>
<a name="line-99"></a> <span class='hs-comment'>{-# INLINE second #-}</span>
<a name="line-100"></a> <span class='hs-varid'>bimap</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Joker</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>g</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runJoker</span>
<a name="line-101"></a> <span class='hs-comment'>{-# INLINE bimap #-}</span>
<a name="line-102"></a>
<a name="line-103"></a><a name="instance%20Functor%20(Joker%20g%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Functor</span> <span class='hs-layout'>(</span><span class='hs-conid'>Joker</span> <span class='hs-varid'>g</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-104"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Joker</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>g</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runJoker</span>
<a name="line-105"></a> <span class='hs-comment'>{-# INLINE fmap #-}</span>
<a name="line-106"></a>
<a name="line-107"></a><a name="instance%20Biapplicative%20(Joker%20g)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Applicative</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Biapplicative</span> <span class='hs-layout'>(</span><span class='hs-conid'>Joker</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-108"></a> <span class='hs-varid'>bipure</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Joker</span> <span class='hs-layout'>(</span><span class='hs-varid'>pure</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-109"></a> <span class='hs-comment'>{-# INLINE bipure #-}</span>
<a name="line-110"></a>
<a name="line-111"></a> <span class='hs-conid'>Joker</span> <span class='hs-varid'>mf</span> <span class='hs-varop'><<*>></span> <span class='hs-conid'>Joker</span> <span class='hs-varid'>mx</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Joker</span> <span class='hs-layout'>(</span><span class='hs-varid'>mf</span> <span class='hs-varop'><*></span> <span class='hs-varid'>mx</span><span class='hs-layout'>)</span>
<a name="line-112"></a> <span class='hs-comment'>{-# INLINE (<<*>>) #-}</span>
<a name="line-113"></a>
<a name="line-114"></a><a name="instance%20Bifoldable%20(Joker%20g)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Foldable</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Bifoldable</span> <span class='hs-layout'>(</span><span class='hs-conid'>Joker</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-115"></a> <span class='hs-varid'>bifoldMap</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldMap</span> <span class='hs-varid'>g</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runJoker</span>
<a name="line-116"></a> <span class='hs-comment'>{-# INLINE bifoldMap #-}</span>
<a name="line-117"></a>
<a name="line-118"></a><a name="instance%20Foldable%20(Joker%20g%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Foldable</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Foldable</span> <span class='hs-layout'>(</span><span class='hs-conid'>Joker</span> <span class='hs-varid'>g</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-119"></a> <span class='hs-varid'>foldMap</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldMap</span> <span class='hs-varid'>g</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runJoker</span>
<a name="line-120"></a> <span class='hs-comment'>{-# INLINE foldMap #-}</span>
<a name="line-121"></a>
<a name="line-122"></a><a name="instance%20Bitraversable%20(Joker%20g)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Traversable</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Bitraversable</span> <span class='hs-layout'>(</span><span class='hs-conid'>Joker</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-123"></a> <span class='hs-varid'>bitraverse</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-conid'>Joker</span> <span class='hs-varop'>.</span> <span class='hs-varid'>traverse</span> <span class='hs-varid'>g</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runJoker</span>
<a name="line-124"></a> <span class='hs-comment'>{-# INLINE bitraverse #-}</span>
<a name="line-125"></a>
<a name="line-126"></a><a name="instance%20Traversable%20(Joker%20g%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Traversable</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Traversable</span> <span class='hs-layout'>(</span><span class='hs-conid'>Joker</span> <span class='hs-varid'>g</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-127"></a> <span class='hs-varid'>traverse</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-conid'>Joker</span> <span class='hs-varop'>.</span> <span class='hs-varid'>traverse</span> <span class='hs-varid'>g</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runJoker</span>
<a name="line-128"></a> <span class='hs-comment'>{-# INLINE traverse #-}</span>
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