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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE BangPatterns, FlexibleInstances, KindSignatures,
<a name="line-2"></a> ScopedTypeVariables, TypeOperators #-}</span>
<a name="line-3"></a><span class='hs-comment'>{-# OPTIONS_GHC -fno-warn-orphans #-}</span>
<a name="line-4"></a>
<a name="line-5"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-6"></a><span class='hs-comment'>-- |</span>
<a name="line-7"></a><span class='hs-comment'>-- Module : Data.Hashable.Generic</span>
<a name="line-8"></a><span class='hs-comment'>-- Copyright : (c) Bryan O'Sullivan 2012</span>
<a name="line-9"></a><span class='hs-comment'>-- License : BSD-style</span>
<a name="line-10"></a><span class='hs-comment'>-- Maintainer : bos@serpentine.com</span>
<a name="line-11"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-12"></a><span class='hs-comment'>-- Portability : GHC >= 7.2</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-- Hashable support for GHC generics.</span>
<a name="line-15"></a>
<a name="line-16"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Hashable</span><span class='hs-varop'>.</span><span class='hs-conid'>Generic</span>
<a name="line-17"></a> <span class='hs-layout'>(</span>
<a name="line-18"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-19"></a>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Bits</span> <span class='hs-layout'>(</span><span class='hs-conid'>Bits</span><span class='hs-layout'>,</span> <span class='hs-varid'>shiftR</span><span class='hs-layout'>)</span>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Hashable</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span>
<a name="line-22"></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-23"></a>
<a name="line-24"></a><a name="instance%20GHashable%20V1"></a><span class='hs-comment'>-- Type without constructors</span>
<a name="line-25"></a><a name="instance%20GHashable%20V1"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>GHashable</span> <span class='hs-conid'>V1</span> <span class='hs-keyword'>where</span>
<a name="line-26"></a> <span class='hs-varid'>ghashWithSalt</span> <span class='hs-varid'>salt</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hashWithSalt</span> <span class='hs-varid'>salt</span> <span class='hs-conid'>()</span>
<a name="line-27"></a>
<a name="line-28"></a><a name="instance%20GHashable%20U1"></a><span class='hs-comment'>-- Constructor without arguments</span>
<a name="line-29"></a><a name="instance%20GHashable%20U1"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>GHashable</span> <span class='hs-conid'>U1</span> <span class='hs-keyword'>where</span>
<a name="line-30"></a> <span class='hs-varid'>ghashWithSalt</span> <span class='hs-varid'>salt</span> <span class='hs-conid'>U1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hashWithSalt</span> <span class='hs-varid'>salt</span> <span class='hs-conid'>()</span>
<a name="line-31"></a>
<a name="line-32"></a><a name="instance%20GHashable%20(a%20:*:%20b)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>GHashable</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>GHashable</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>GHashable</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-33"></a> <span class='hs-varid'>ghashWithSalt</span> <span class='hs-varid'>salt</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>salt</span> <span class='hs-varop'>`ghashWithSalt`</span> <span class='hs-varid'>x</span> <span class='hs-varop'>`ghashWithSalt`</span> <span class='hs-varid'>y</span>
<a name="line-34"></a>
<a name="line-35"></a><a name="instance%20GHashable%20(M1%20i%20c%20a)"></a><span class='hs-comment'>-- Metadata (constructor name, etc)</span>
<a name="line-36"></a><a name="instance%20GHashable%20(M1%20i%20c%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>GHashable</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>GHashable</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'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-37"></a> <span class='hs-varid'>ghashWithSalt</span> <span class='hs-varid'>salt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ghashWithSalt</span> <span class='hs-varid'>salt</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unM1</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="instance%20GHashable%20(K1%20i%20a)"></a><span class='hs-comment'>-- Constants, additional parameters, and rank-1 recursion</span>
<a name="line-40"></a><a name="instance%20GHashable%20(K1%20i%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Hashable</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>GHashable</span> <span class='hs-layout'>(</span><span class='hs-conid'>K1</span> <span class='hs-varid'>i</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-41"></a> <span class='hs-varid'>ghashWithSalt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hashUsing</span> <span class='hs-varid'>unK1</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="GHashable"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>GSum</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>where</span>
<a name="line-44"></a> <span class='hs-varid'>hashSum</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-45"></a>
<a name="line-46"></a><a name="instance%20GHashable%20(a%20:+:%20b)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>GSum</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>GSum</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-conid'>GHashable</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>GHashable</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span>
<a name="line-47"></a> <span class='hs-conid'>SumSize</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>SumSize</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>GHashable</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-conop'>:+:</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-48"></a> <span class='hs-varid'>ghashWithSalt</span> <span class='hs-varid'>salt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hashSum</span> <span class='hs-varid'>salt</span> <span class='hs-num'>0</span> <span class='hs-varid'>size</span>
<a name="line-49"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>size</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unTagged</span> <span class='hs-layout'>(</span><span class='hs-varid'>sumSize</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Tagged</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-conop'>:+:</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="instance%20GSum%20(a%20:+:%20b)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>GSum</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>GSum</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-conid'>GHashable</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>GHashable</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>GSum</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-conop'>:+:</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-52"></a> <span class='hs-varid'>hashSum</span> <span class='hs-varop'>!</span><span class='hs-varid'>salt</span> <span class='hs-varop'>!</span><span class='hs-varid'>code</span> <span class='hs-varop'>!</span><span class='hs-varid'>size</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-53"></a> <span class='hs-conid'>L1</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>hashSum</span> <span class='hs-varid'>salt</span> <span class='hs-varid'>code</span> <span class='hs-varid'>sizeL</span> <span class='hs-varid'>x</span>
<a name="line-54"></a> <span class='hs-conid'>R1</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>hashSum</span> <span class='hs-varid'>salt</span> <span class='hs-layout'>(</span><span class='hs-varid'>code</span> <span class='hs-varop'>+</span> <span class='hs-varid'>sizeL</span><span class='hs-layout'>)</span> <span class='hs-varid'>sizeR</span> <span class='hs-varid'>x</span>
<a name="line-55"></a> <span class='hs-keyword'>where</span>
<a name="line-56"></a> <span class='hs-varid'>sizeL</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>size</span> <span class='hs-varop'>`shiftR`</span> <span class='hs-num'>1</span>
<a name="line-57"></a> <span class='hs-varid'>sizeR</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>size</span> <span class='hs-comment'>-</span> <span class='hs-varid'>sizeL</span>
<a name="line-58"></a> <span class='hs-comment'>{-# INLINE hashSum #-}</span>
<a name="line-59"></a>
<a name="line-60"></a><a name="instance%20GSum%20(C1%20c%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>GHashable</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>GSum</span> <span class='hs-layout'>(</span><span class='hs-conid'>C1</span> <span class='hs-varid'>c</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-61"></a> <span class='hs-varid'>hashSum</span> <span class='hs-varop'>!</span><span class='hs-varid'>salt</span> <span class='hs-varop'>!</span><span class='hs-varid'>code</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>salt</span> <span class='hs-varop'>`hashWithSalt`</span> <span class='hs-varid'>code</span> <span class='hs-varop'>`ghashWithSalt`</span> <span class='hs-varid'>x</span>
<a name="line-62"></a> <span class='hs-comment'>{-# INLINE hashSum #-}</span>
<a name="line-63"></a>
<a name="line-64"></a><a name="SumSize"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>SumSize</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>where</span>
<a name="line-65"></a> <span class='hs-varid'>sumSize</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Tagged</span> <span class='hs-varid'>f</span>
<a name="line-66"></a>
<a name="line-67"></a><a name="Tagged"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>Tagged</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>*</span> <span class='hs-keyglyph'>-></span> <span class='hs-varop'>*</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Tagged</span> <span class='hs-layout'>{</span><span class='hs-varid'>unTagged</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span><span class='hs-layout'>}</span>
<a name="line-68"></a>
<a name="line-69"></a><a name="instance%20SumSize%20(a%20:+:%20b)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>SumSize</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>SumSize</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>SumSize</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-conop'>:+:</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-70"></a> <span class='hs-varid'>sumSize</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Tagged</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unTagged</span> <span class='hs-layout'>(</span><span class='hs-varid'>sumSize</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Tagged</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varop'>+</span>
<a name="line-71"></a> <span class='hs-varid'>unTagged</span> <span class='hs-layout'>(</span><span class='hs-varid'>sumSize</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Tagged</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-72"></a>
<a name="line-73"></a><a name="instance%20SumSize%20(C1%20c%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SumSize</span> <span class='hs-layout'>(</span><span class='hs-conid'>C1</span> <span class='hs-varid'>c</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-74"></a> <span class='hs-varid'>sumSize</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Tagged</span> <span class='hs-num'>1</span>
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