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<title>src/Control/Lens/Internal/FieldTH.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 PatternGuards #-}</span>
<a name="line-3"></a><span class='hs-cpp'>#ifdef TRUSTWORTHY</span>
<a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE Trustworthy #-}</span>
<a name="line-5"></a><span class='hs-cpp'>#endif</span>
<a name="line-6"></a>
<a name="line-7"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-8"></a><span class='hs-comment'>-- |</span>
<a name="line-9"></a><span class='hs-comment'>-- Module : Control.Lens.Internal.FieldTH</span>
<a name="line-10"></a><span class='hs-comment'>-- Copyright : (C) 2014-2015 Edward Kmett, (C) 2014 Eric Mertens</span>
<a name="line-11"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-12"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-13"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-14"></a><span class='hs-comment'>-- Portability : non-portable</span>
<a name="line-15"></a><span class='hs-comment'>--</span>
<a name="line-16"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-17"></a>
<a name="line-18"></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'>FieldTH</span>
<a name="line-19"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>LensRules</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>DefName</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>makeFieldOptics</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>makeFieldOpticsForDec</span>
<a name="line-23"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-24"></a>
<a name="line-25"></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'>At</span>
<a name="line-26"></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'>Fold</span>
<a name="line-27"></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'>TH</span>
<a name="line-28"></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'>Plated</span>
<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'>Prism</span>
<a name="line-30"></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'>Setter</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'>Traversal</span>
<a name="line-33"></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'>Tuple</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'>Applicative</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'>Monad</span>
<a name="line-36"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>TH</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-37"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>TH</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'>Foldable</span> <span class='hs-layout'>(</span><span class='hs-varid'>toList</span><span class='hs-layout'>)</span>
<a name="line-39"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>isJust</span><span class='hs-layout'>,</span><span class='hs-varid'>maybeToList</span><span class='hs-layout'>)</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'>List</span> <span class='hs-layout'>(</span><span class='hs-varid'>nub</span><span class='hs-layout'>,</span> <span class='hs-varid'>findIndices</span><span class='hs-layout'>)</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'>Either</span> <span class='hs-layout'>(</span><span class='hs-varid'>partitionEithers</span><span class='hs-layout'>)</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'>Set</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-43"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Map</span> <span class='hs-layout'>)</span>
<a name="line-44"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Set</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Set</span> <span class='hs-layout'>)</span>
<a name="line-45"></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'>Set</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Set</span>
<a name="line-46"></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'>Map</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Map</span>
<a name="line-47"></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'>Traversable</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>T</span>
<a name="line-48"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span>
<a name="line-49"></a>
<a name="line-50"></a>
<a name="line-51"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-52"></a><span class='hs-comment'>-- Field generation entry point</span>
<a name="line-53"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-54"></a>
<a name="line-55"></a>
<a name="line-56"></a><a name="makeFieldOptics"></a><span class='hs-comment'>-- | Compute the field optics for the type identified by the given type name.</span>
<a name="line-57"></a><span class='hs-comment'>-- Lenses will be computed when possible, Traversals otherwise.</span>
<a name="line-58"></a><span class='hs-definition'>makeFieldOptics</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensRules</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-59"></a><span class='hs-definition'>makeFieldOptics</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>tyName</span> <span class='hs-keyglyph'>=</span>
<a name="line-60"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>info</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>reify</span> <span class='hs-varid'>tyName</span>
<a name="line-61"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>info</span> <span class='hs-keyword'>of</span>
<a name="line-62"></a> <span class='hs-conid'>TyConI</span> <span class='hs-varid'>dec</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>makeFieldOpticsForDec</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>dec</span>
<a name="line-63"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"makeFieldOptics: Expected type constructor name"</span>
<a name="line-64"></a>
<a name="line-65"></a>
<a name="line-66"></a><a name="makeFieldOpticsForDec"></a><span class='hs-definition'>makeFieldOpticsForDec</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensRules</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Dec</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-67"></a><span class='hs-definition'>makeFieldOpticsForDec</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>dec</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>dec</span> <span class='hs-keyword'>of</span>
<a name="line-68"></a> <span class='hs-conid'>DataD</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>vars</span> <span class='hs-varid'>cons</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span>
<a name="line-69"></a> <span class='hs-varid'>makeFieldOpticsForDec'</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>tyName</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkS</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>vars</span><span class='hs-layout'>)</span> <span class='hs-varid'>cons</span>
<a name="line-70"></a> <span class='hs-conid'>NewtypeD</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>vars</span> <span class='hs-varid'>con</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span>
<a name="line-71"></a> <span class='hs-varid'>makeFieldOpticsForDec'</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>tyName</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkS</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>vars</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>con</span><span class='hs-keyglyph'>]</span>
<a name="line-72"></a> <span class='hs-conid'>DataInstD</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>args</span> <span class='hs-varid'>cons</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span>
<a name="line-73"></a> <span class='hs-varid'>makeFieldOpticsForDec'</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>tyName</span> <span class='hs-layout'>(</span><span class='hs-varid'>tyName</span> <span class='hs-varop'>`conAppsT`</span> <span class='hs-varid'>args</span><span class='hs-layout'>)</span> <span class='hs-varid'>cons</span>
<a name="line-74"></a> <span class='hs-conid'>NewtypeInstD</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>args</span> <span class='hs-varid'>con</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span>
<a name="line-75"></a> <span class='hs-varid'>makeFieldOpticsForDec'</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>tyName</span> <span class='hs-layout'>(</span><span class='hs-varid'>tyName</span> <span class='hs-varop'>`conAppsT`</span> <span class='hs-varid'>args</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>con</span><span class='hs-keyglyph'>]</span>
<a name="line-76"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"makeFieldOptics: Expected data or newtype type-constructor"</span>
<a name="line-77"></a> <span class='hs-keyword'>where</span>
<a name="line-78"></a> <span class='hs-varid'>mkS</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>vars</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tyName</span> <span class='hs-varop'>`conAppsT`</span> <span class='hs-varid'>map</span> <span class='hs-conid'>VarT</span> <span class='hs-layout'>(</span><span class='hs-varid'>toListOf</span> <span class='hs-varid'>typeVars</span> <span class='hs-varid'>vars</span><span class='hs-layout'>)</span>
<a name="line-79"></a>
<a name="line-80"></a>
<a name="line-81"></a><a name="makeFieldOpticsForDec'"></a><span class='hs-comment'>-- | Compute the field optics for a deconstructed Dec</span>
<a name="line-82"></a><span class='hs-comment'>-- When possible build an Iso otherwise build one optic per field.</span>
<a name="line-83"></a><span class='hs-definition'>makeFieldOpticsForDec'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensRules</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Type</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Con</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-84"></a><span class='hs-definition'>makeFieldOpticsForDec'</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>s</span> <span class='hs-varid'>cons</span> <span class='hs-keyglyph'>=</span>
<a name="line-85"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>fieldCons</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>traverse</span> <span class='hs-varid'>normalizeConstructor</span> <span class='hs-varid'>cons</span>
<a name="line-86"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>allFields</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toListOf</span> <span class='hs-layout'>(</span><span class='hs-varid'>folded</span> <span class='hs-varop'>.</span> <span class='hs-sel'>_2</span> <span class='hs-varop'>.</span> <span class='hs-varid'>folded</span> <span class='hs-varop'>.</span> <span class='hs-sel'>_1</span> <span class='hs-varop'>.</span> <span class='hs-varid'>folded</span><span class='hs-layout'>)</span> <span class='hs-varid'>fieldCons</span>
<a name="line-87"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>defCons</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>over</span> <span class='hs-varid'>normFieldLabels</span> <span class='hs-layout'>(</span><span class='hs-varid'>expandName</span> <span class='hs-varid'>allFields</span><span class='hs-layout'>)</span> <span class='hs-varid'>fieldCons</span>
<a name="line-88"></a> <span class='hs-varid'>allDefs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>setOf</span> <span class='hs-layout'>(</span><span class='hs-varid'>normFieldLabels</span> <span class='hs-varop'>.</span> <span class='hs-varid'>folded</span><span class='hs-layout'>)</span> <span class='hs-varid'>defCons</span>
<a name="line-89"></a> <span class='hs-varid'>perDef</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>sequenceA</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromSet</span> <span class='hs-layout'>(</span><span class='hs-varid'>buildScaffold</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>s</span> <span class='hs-varid'>defCons</span><span class='hs-layout'>)</span> <span class='hs-varid'>allDefs</span><span class='hs-layout'>)</span>
<a name="line-90"></a>
<a name="line-91"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>defs</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>toList</span> <span class='hs-varid'>perDef</span>
<a name="line-92"></a> <span class='hs-keyword'>case</span> <span class='hs-sel'>_classyLenses</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>tyName</span> <span class='hs-keyword'>of</span>
<a name="line-93"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>className</span><span class='hs-layout'>,</span> <span class='hs-varid'>methodName</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-94"></a> <span class='hs-varid'>makeClassyDriver</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>className</span> <span class='hs-varid'>methodName</span> <span class='hs-varid'>s</span> <span class='hs-varid'>defs</span>
<a name="line-95"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>decss</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>traverse</span> <span class='hs-layout'>(</span><span class='hs-varid'>makeFieldOptic</span> <span class='hs-varid'>rules</span><span class='hs-layout'>)</span> <span class='hs-varid'>defs</span>
<a name="line-96"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>concat</span> <span class='hs-varid'>decss</span><span class='hs-layout'>)</span>
<a name="line-97"></a>
<a name="line-98"></a> <span class='hs-keyword'>where</span>
<a name="line-99"></a>
<a name="line-100"></a> <span class='hs-comment'>-- Traverse the field labels of a normalized constructor</span>
<a name="line-101"></a> <span class='hs-varid'>normFieldLabels</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Traversal</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Name</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-conid'>Type</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Name</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span><span class='hs-conid'>Type</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span>
<a name="line-102"></a> <span class='hs-varid'>normFieldLabels</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>traverse</span> <span class='hs-varop'>.</span> <span class='hs-sel'>_2</span> <span class='hs-varop'>.</span> <span class='hs-varid'>traverse</span> <span class='hs-varop'>.</span> <span class='hs-sel'>_1</span>
<a name="line-103"></a>
<a name="line-104"></a> <span class='hs-comment'>-- Map a (possibly missing) field's name to zero-to-many optic definitions</span>
<a name="line-105"></a> <span class='hs-varid'>expandName</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Name</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DefName</span><span class='hs-keyglyph'>]</span>
<a name="line-106"></a> <span class='hs-varid'>expandName</span> <span class='hs-varid'>allFields</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concatMap</span> <span class='hs-layout'>(</span><span class='hs-sel'>_fieldToDef</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>tyName</span> <span class='hs-varid'>allFields</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>maybeToList</span>
<a name="line-107"></a>
<a name="line-108"></a><a name="normalizeConstructor"></a><span class='hs-comment'>-- | Normalized the Con type into a uniform positional representation,</span>
<a name="line-109"></a><span class='hs-comment'>-- eliminating the variance between records, infix constructors, and normal</span>
<a name="line-110"></a><span class='hs-comment'>-- constructors.</span>
<a name="line-111"></a><span class='hs-definition'>normalizeConstructor</span> <span class='hs-keyglyph'>::</span>
<a name="line-112"></a> <span class='hs-conid'>Con</span> <span class='hs-keyglyph'>-></span>
<a name="line-113"></a> <span class='hs-conid'>Q</span> <span class='hs-layout'>(</span><span class='hs-conid'>Name</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>Name</span><span class='hs-layout'>,</span> <span class='hs-conid'>Type</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ constructor name, field name, field type</span>
<a name="line-114"></a>
<a name="line-115"></a><span class='hs-definition'>normalizeConstructor</span> <span class='hs-layout'>(</span><span class='hs-conid'>RecC</span> <span class='hs-varid'>n</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-116"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>fieldName</span><span class='hs-layout'>,</span> <span class='hs-varid'>ty</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>fieldName</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-varid'>ty</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>xs</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-117"></a>
<a name="line-118"></a><span class='hs-definition'>normalizeConstructor</span> <span class='hs-layout'>(</span><span class='hs-conid'>NormalC</span> <span class='hs-varid'>n</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-119"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>,</span> <span class='hs-varid'>ty</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-varid'>ty</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>xs</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-120"></a>
<a name="line-121"></a><span class='hs-definition'>normalizeConstructor</span> <span class='hs-layout'>(</span><span class='hs-conid'>InfixC</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-varid'>ty1</span><span class='hs-layout'>)</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-varid'>ty2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-122"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>,</span> <span class='hs-varid'>ty1</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>,</span> <span class='hs-varid'>ty2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-123"></a>
<a name="line-124"></a><span class='hs-definition'>normalizeConstructor</span> <span class='hs-layout'>(</span><span class='hs-conid'>ForallC</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>con</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-125"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>con'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>normalizeConstructor</span> <span class='hs-varid'>con</span>
<a name="line-126"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>set</span> <span class='hs-layout'>(</span><span class='hs-sel'>_2</span> <span class='hs-varop'>.</span> <span class='hs-varid'>mapped</span> <span class='hs-varop'>.</span> <span class='hs-sel'>_1</span><span class='hs-layout'>)</span> <span class='hs-conid'>Nothing</span> <span class='hs-varid'>con'</span><span class='hs-layout'>)</span>
<a name="line-127"></a>
<a name="line-128"></a>
<a name="line-129"></a>
<a name="line-130"></a><a name="OpticType"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>OpticType</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>GetterType</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>LensType</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>IsoType</span>
<a name="line-131"></a>
<a name="line-132"></a><a name="buildScaffold"></a><span class='hs-comment'>-- | Compute the positional location of the fields involved in</span>
<a name="line-133"></a><span class='hs-comment'>-- each constructor for a given optic definition as well as the</span>
<a name="line-134"></a><span class='hs-comment'>-- type of clauses to generate and the type to annotate the declaration</span>
<a name="line-135"></a><span class='hs-comment'>-- with.</span>
<a name="line-136"></a><span class='hs-definition'>buildScaffold</span> <span class='hs-keyglyph'>::</span>
<a name="line-137"></a> <span class='hs-conid'>LensRules</span> <span class='hs-keyglyph'>-></span>
<a name="line-138"></a> <span class='hs-conid'>Type</span> <span class='hs-comment'>{- ^ outer type -}</span> <span class='hs-keyglyph'>-></span>
<a name="line-139"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Name</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>DefName</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span> <span class='hs-conid'>Type</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>{- ^ normalized constructors -}</span> <span class='hs-keyglyph'>-></span>
<a name="line-140"></a> <span class='hs-conid'>DefName</span> <span class='hs-comment'>{- ^ target definition -}</span> <span class='hs-keyglyph'>-></span>
<a name="line-141"></a> <span class='hs-conid'>Q</span> <span class='hs-layout'>(</span><span class='hs-conid'>OpticType</span><span class='hs-layout'>,</span> <span class='hs-conid'>OpticStab</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Name</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-142"></a> <span class='hs-comment'>{- ^ optic type, definition type, field count, target fields -}</span>
<a name="line-143"></a><span class='hs-definition'>buildScaffold</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>s</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>defName</span> <span class='hs-keyglyph'>=</span>
<a name="line-144"></a>
<a name="line-145"></a> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>s'</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>buildStab</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-varid'>concatMap</span> <span class='hs-varid'>snd</span> <span class='hs-varid'>consForDef</span><span class='hs-layout'>)</span>
<a name="line-146"></a>
<a name="line-147"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>defType</span>
<a name="line-148"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-varid'>cx</span><span class='hs-layout'>,</span><span class='hs-varid'>a'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>preview</span> <span class='hs-sel'>_ForallT</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-149"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>optic</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>lensCase</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getterTypeName</span>
<a name="line-150"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldTypeName</span>
<a name="line-151"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>OpticSa</span> <span class='hs-varid'>cx</span> <span class='hs-varid'>optic</span> <span class='hs-varid'>s'</span> <span class='hs-varid'>a'</span>
<a name="line-152"></a>
<a name="line-153"></a> <span class='hs-comment'>-- Getter and Fold are always simple</span>
<a name="line-154"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-sel'>_allowUpdates</span> <span class='hs-varid'>rules</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-155"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>optic</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>lensCase</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getterTypeName</span>
<a name="line-156"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldTypeName</span>
<a name="line-157"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>OpticSa</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>optic</span> <span class='hs-varid'>s'</span> <span class='hs-varid'>a</span>
<a name="line-158"></a>
<a name="line-159"></a> <span class='hs-comment'>-- Generate simple Lens and Traversal where possible</span>
<a name="line-160"></a> <span class='hs-keyglyph'>|</span> <span class='hs-sel'>_simpleLenses</span> <span class='hs-varid'>rules</span> <span class='hs-varop'>||</span> <span class='hs-varid'>s'</span> <span class='hs-varop'>==</span> <span class='hs-varid'>t</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>a</span> <span class='hs-varop'>==</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span>
<a name="line-161"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>optic</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isoCase</span> <span class='hs-varop'>&&</span> <span class='hs-sel'>_allowIsos</span> <span class='hs-varid'>rules</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iso'TypeName</span>
<a name="line-162"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>lensCase</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lens'TypeName</span>
<a name="line-163"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>traversal'TypeName</span>
<a name="line-164"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>OpticSa</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>optic</span> <span class='hs-varid'>s'</span> <span class='hs-varid'>a</span>
<a name="line-165"></a>
<a name="line-166"></a> <span class='hs-comment'>-- Generate type-changing Lens and Traversal otherwise</span>
<a name="line-167"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span>
<a name="line-168"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>optic</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isoCase</span> <span class='hs-varop'>&&</span> <span class='hs-sel'>_allowIsos</span> <span class='hs-varid'>rules</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>isoTypeName</span>
<a name="line-169"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>lensCase</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lensTypeName</span>
<a name="line-170"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>traversalTypeName</span>
<a name="line-171"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>OpticStab</span> <span class='hs-varid'>optic</span> <span class='hs-varid'>s'</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span>
<a name="line-172"></a>
<a name="line-173"></a> <span class='hs-varid'>opticType</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>has</span> <span class='hs-sel'>_ForallT</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>GetterType</span>
<a name="line-174"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-sel'>_allowUpdates</span> <span class='hs-varid'>rules</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>GetterType</span>
<a name="line-175"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isoCase</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IsoType</span>
<a name="line-176"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LensType</span>
<a name="line-177"></a>
<a name="line-178"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>opticType</span><span class='hs-layout'>,</span> <span class='hs-varid'>defType</span><span class='hs-layout'>,</span> <span class='hs-varid'>scaffolds</span><span class='hs-layout'>)</span>
<a name="line-179"></a> <span class='hs-keyword'>where</span>
<a name="line-180"></a> <span class='hs-varid'>consForDef</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Name</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Either</span> <span class='hs-conid'>Type</span> <span class='hs-conid'>Type</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-181"></a> <span class='hs-varid'>consForDef</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>over</span> <span class='hs-layout'>(</span><span class='hs-varid'>mapped</span> <span class='hs-varop'>.</span> <span class='hs-sel'>_2</span> <span class='hs-varop'>.</span> <span class='hs-varid'>mapped</span><span class='hs-layout'>)</span> <span class='hs-varid'>categorize</span> <span class='hs-varid'>cons</span>
<a name="line-182"></a>
<a name="line-183"></a> <span class='hs-varid'>scaffolds</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Name</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-184"></a> <span class='hs-varid'>scaffolds</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-layout'>,</span> <span class='hs-varid'>length</span> <span class='hs-varid'>ts</span><span class='hs-layout'>,</span> <span class='hs-varid'>rightIndices</span> <span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-layout'>,</span><span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>consForDef</span> <span class='hs-keyglyph'>]</span>
<a name="line-185"></a>
<a name="line-186"></a> <span class='hs-varid'>rightIndices</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Either</span> <span class='hs-conid'>Type</span> <span class='hs-conid'>Type</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span>
<a name="line-187"></a> <span class='hs-varid'>rightIndices</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>findIndices</span> <span class='hs-layout'>(</span><span class='hs-varid'>has</span> <span class='hs-sel'>_Right</span><span class='hs-layout'>)</span>
<a name="line-188"></a>
<a name="line-189"></a> <span class='hs-comment'>-- Right: types for this definition</span>
<a name="line-190"></a> <span class='hs-comment'>-- Left : other types</span>
<a name="line-191"></a> <span class='hs-varid'>categorize</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>DefName</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span> <span class='hs-conid'>Type</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Either</span> <span class='hs-conid'>Type</span> <span class='hs-conid'>Type</span>
<a name="line-192"></a> <span class='hs-varid'>categorize</span> <span class='hs-layout'>(</span><span class='hs-varid'>defNames</span><span class='hs-layout'>,</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-193"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>defName</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>defNames</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>t</span>
<a name="line-194"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>t</span>
<a name="line-195"></a>
<a name="line-196"></a> <span class='hs-varid'>lensCase</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span>
<a name="line-197"></a> <span class='hs-varid'>lensCase</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>all</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>lengthOf</span> <span class='hs-layout'>(</span><span class='hs-sel'>_2</span> <span class='hs-varop'>.</span> <span class='hs-varid'>folded</span> <span class='hs-varop'>.</span> <span class='hs-sel'>_Right</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>consForDef</span>
<a name="line-198"></a>
<a name="line-199"></a> <span class='hs-varid'>isoCase</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span>
<a name="line-200"></a> <span class='hs-varid'>isoCase</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>scaffolds</span> <span class='hs-keyword'>of</span>
<a name="line-201"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-num'>1</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-num'>0</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-202"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-203"></a>
<a name="line-204"></a>
<a name="line-205"></a><a name="OpticStab"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>OpticStab</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>OpticStab</span> <span class='hs-conid'>Name</span> <span class='hs-conid'>Type</span> <span class='hs-conid'>Type</span> <span class='hs-conid'>Type</span> <span class='hs-conid'>Type</span>
<a name="line-206"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpticSa</span> <span class='hs-conid'>Cxt</span> <span class='hs-conid'>Name</span> <span class='hs-conid'>Type</span> <span class='hs-conid'>Type</span>
<a name="line-207"></a>
<a name="line-208"></a><a name="stabToType"></a><span class='hs-definition'>stabToType</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OpticStab</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Type</span>
<a name="line-209"></a><span class='hs-definition'>stabToType</span> <span class='hs-layout'>(</span><span class='hs-conid'>OpticStab</span> <span class='hs-varid'>c</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>quantifyType</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span> <span class='hs-varop'>`conAppsT`</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-210"></a><span class='hs-definition'>stabToType</span> <span class='hs-layout'>(</span><span class='hs-conid'>OpticSa</span> <span class='hs-varid'>cx</span> <span class='hs-varid'>c</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>quantifyType</span> <span class='hs-varid'>cx</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span> <span class='hs-varop'>`conAppsT`</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-211"></a>
<a name="line-212"></a><a name="stabToContext"></a><span class='hs-definition'>stabToContext</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OpticStab</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Cxt</span>
<a name="line-213"></a><span class='hs-definition'>stabToContext</span> <span class='hs-conid'>OpticStab</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-214"></a><span class='hs-definition'>stabToContext</span> <span class='hs-layout'>(</span><span class='hs-conid'>OpticSa</span> <span class='hs-varid'>cx</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cx</span>
<a name="line-215"></a>
<a name="line-216"></a><a name="stabToOptic"></a><span class='hs-definition'>stabToOptic</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OpticStab</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span>
<a name="line-217"></a><span class='hs-definition'>stabToOptic</span> <span class='hs-layout'>(</span><span class='hs-conid'>OpticStab</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c</span>
<a name="line-218"></a><span class='hs-definition'>stabToOptic</span> <span class='hs-layout'>(</span><span class='hs-conid'>OpticSa</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c</span>
<a name="line-219"></a>
<a name="line-220"></a><a name="stabToS"></a><span class='hs-definition'>stabToS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OpticStab</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Type</span>
<a name="line-221"></a><span class='hs-definition'>stabToS</span> <span class='hs-layout'>(</span><span class='hs-conid'>OpticStab</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s</span>
<a name="line-222"></a><span class='hs-definition'>stabToS</span> <span class='hs-layout'>(</span><span class='hs-conid'>OpticSa</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s</span>
<a name="line-223"></a>
<a name="line-224"></a><a name="stabToA"></a><span class='hs-definition'>stabToA</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OpticStab</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Type</span>
<a name="line-225"></a><span class='hs-definition'>stabToA</span> <span class='hs-layout'>(</span><span class='hs-conid'>OpticStab</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-226"></a><span class='hs-definition'>stabToA</span> <span class='hs-layout'>(</span><span class='hs-conid'>OpticSa</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-227"></a>
<a name="line-228"></a><a name="buildStab"></a><span class='hs-comment'>-- | Compute the s t a b types given the outer type 's' and the</span>
<a name="line-229"></a><span class='hs-comment'>-- categorized field types. Left for fixed and Right for visited.</span>
<a name="line-230"></a><span class='hs-comment'>-- These types are "raw" and will be packaged into an 'OpticStab'</span>
<a name="line-231"></a><span class='hs-comment'>-- shortly after creation.</span>
<a name="line-232"></a><span class='hs-definition'>buildStab</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Type</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Either</span> <span class='hs-conid'>Type</span> <span class='hs-conid'>Type</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Q</span> <span class='hs-layout'>(</span><span class='hs-conid'>Type</span><span class='hs-layout'>,</span><span class='hs-conid'>Type</span><span class='hs-layout'>,</span><span class='hs-conid'>Type</span><span class='hs-layout'>,</span><span class='hs-conid'>Type</span><span class='hs-layout'>)</span>
<a name="line-233"></a><span class='hs-definition'>buildStab</span> <span class='hs-varid'>s</span> <span class='hs-varid'>categorizedFields</span> <span class='hs-keyglyph'>=</span>
<a name="line-234"></a> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>subA</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unifyTypes</span> <span class='hs-varid'>targetFields</span>
<a name="line-235"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>applyTypeSubst</span> <span class='hs-varid'>subA</span> <span class='hs-varid'>s</span>
<a name="line-236"></a>
<a name="line-237"></a> <span class='hs-comment'>-- compute possible type changes</span>
<a name="line-238"></a> <span class='hs-varid'>sub</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>sequenceA</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromSet</span> <span class='hs-layout'>(</span><span class='hs-varid'>newName</span> <span class='hs-varop'>.</span> <span class='hs-varid'>nameBase</span><span class='hs-layout'>)</span> <span class='hs-varid'>unfixedTypeVars</span><span class='hs-layout'>)</span>
<a name="line-239"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>over</span> <span class='hs-varid'>both</span> <span class='hs-layout'>(</span><span class='hs-varid'>substTypeVars</span> <span class='hs-varid'>sub</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>s'</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-240"></a>
<a name="line-241"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>s'</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-242"></a>
<a name="line-243"></a> <span class='hs-keyword'>where</span>
<a name="line-244"></a> <span class='hs-layout'>(</span><span class='hs-varid'>fixedFields</span><span class='hs-layout'>,</span> <span class='hs-varid'>targetFields</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>partitionEithers</span> <span class='hs-varid'>categorizedFields</span>
<a name="line-245"></a> <span class='hs-varid'>fixedTypeVars</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>setOf</span> <span class='hs-varid'>typeVars</span> <span class='hs-varid'>fixedFields</span>
<a name="line-246"></a> <span class='hs-varid'>unfixedTypeVars</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>setOf</span> <span class='hs-varid'>typeVars</span> <span class='hs-varid'>s</span> <span class='hs-conid'>Set</span><span class='hs-varop'>.\\</span> <span class='hs-varid'>fixedTypeVars</span>
<a name="line-247"></a>
<a name="line-248"></a>
<a name="line-249"></a><a name="makeFieldOptic"></a><span class='hs-comment'>-- | Build the signature and definition for a single field optic.</span>
<a name="line-250"></a><span class='hs-comment'>-- In the case of a singleton constructor irrefutable matches are</span>
<a name="line-251"></a><span class='hs-comment'>-- used to enable the resulting lenses to be used on a bottom value.</span>
<a name="line-252"></a><span class='hs-definition'>makeFieldOptic</span> <span class='hs-keyglyph'>::</span>
<a name="line-253"></a> <span class='hs-conid'>LensRules</span> <span class='hs-keyglyph'>-></span>
<a name="line-254"></a> <span class='hs-layout'>(</span><span class='hs-conid'>DefName</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conid'>OpticType</span><span class='hs-layout'>,</span> <span class='hs-conid'>OpticStab</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Name</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-255"></a> <span class='hs-conid'>DecsQ</span>
<a name="line-256"></a><span class='hs-definition'>makeFieldOptic</span> <span class='hs-varid'>rules</span> <span class='hs-layout'>(</span><span class='hs-varid'>defName</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>opticType</span><span class='hs-layout'>,</span> <span class='hs-varid'>defType</span><span class='hs-layout'>,</span> <span class='hs-varid'>cons</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-257"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>cls</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mkCls</span>
<a name="line-258"></a> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>sequenceA</span> <span class='hs-layout'>(</span><span class='hs-varid'>cls</span> <span class='hs-varop'>++</span> <span class='hs-varid'>sig</span> <span class='hs-varop'>++</span> <span class='hs-varid'>def</span><span class='hs-layout'>)</span>
<a name="line-259"></a> <span class='hs-keyword'>where</span>
<a name="line-260"></a> <span class='hs-varid'>mkCls</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>defName</span> <span class='hs-keyword'>of</span>
<a name="line-261"></a> <span class='hs-conid'>MethodName</span> <span class='hs-varid'>c</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>|</span> <span class='hs-sel'>_generateClasses</span> <span class='hs-varid'>rules</span> <span class='hs-keyglyph'>-></span>
<a name="line-262"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>classExists</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>isJust</span> <span class='hs-varop'><$></span> <span class='hs-varid'>lookupTypeName</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-263"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-keyword'>if</span> <span class='hs-varid'>classExists</span> <span class='hs-keyword'>then</span> <span class='hs-conid'>[]</span> <span class='hs-keyword'>else</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>makeFieldClass</span> <span class='hs-varid'>defType</span> <span class='hs-varid'>c</span> <span class='hs-varid'>n</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-264"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span>
<a name="line-265"></a>
<a name="line-266"></a> <span class='hs-varid'>sig</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>defName</span> <span class='hs-keyword'>of</span>
<a name="line-267"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-sel'>_generateSigs</span> <span class='hs-varid'>rules</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>[]</span>
<a name="line-268"></a> <span class='hs-conid'>TopName</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>sigD</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>stabToType</span> <span class='hs-varid'>defType</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-269"></a> <span class='hs-conid'>MethodName</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>[]</span>
<a name="line-270"></a>
<a name="line-271"></a> <span class='hs-varid'>fun</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>funD</span> <span class='hs-varid'>n</span> <span class='hs-varid'>clauses</span> <span class='hs-conop'>:</span> <span class='hs-varid'>inlinePragma</span> <span class='hs-varid'>n</span>
<a name="line-272"></a>
<a name="line-273"></a> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>defName</span> <span class='hs-keyword'>of</span>
<a name="line-274"></a> <span class='hs-conid'>TopName</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fun</span> <span class='hs-varid'>n</span>
<a name="line-275"></a> <span class='hs-conid'>MethodName</span> <span class='hs-varid'>c</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>makeFieldInstance</span> <span class='hs-varid'>defType</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-varid'>fun</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-276"></a>
<a name="line-277"></a> <span class='hs-varid'>clauses</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeFieldClauses</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>opticType</span> <span class='hs-varid'>cons</span>
<a name="line-278"></a>
<a name="line-279"></a>
<a name="line-280"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-281"></a><span class='hs-comment'>-- Classy class generator</span>
<a name="line-282"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-283"></a>
<a name="line-284"></a>
<a name="line-285"></a><a name="makeClassyDriver"></a><span class='hs-definition'>makeClassyDriver</span> <span class='hs-keyglyph'>::</span>
<a name="line-286"></a> <span class='hs-conid'>LensRules</span> <span class='hs-keyglyph'>-></span>
<a name="line-287"></a> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span>
<a name="line-288"></a> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span>
<a name="line-289"></a> <span class='hs-conid'>Type</span> <span class='hs-comment'>{- ^ Outer 's' type -}</span> <span class='hs-keyglyph'>-></span>
<a name="line-290"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>DefName</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conid'>OpticType</span><span class='hs-layout'>,</span> <span class='hs-conid'>OpticStab</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Name</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span>
<a name="line-291"></a> <span class='hs-conid'>DecsQ</span>
<a name="line-292"></a><span class='hs-definition'>makeClassyDriver</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>className</span> <span class='hs-varid'>methodName</span> <span class='hs-varid'>s</span> <span class='hs-varid'>defs</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>sequenceA</span> <span class='hs-layout'>(</span><span class='hs-varid'>cls</span> <span class='hs-varop'>++</span> <span class='hs-varid'>inst</span><span class='hs-layout'>)</span>
<a name="line-293"></a>
<a name="line-294"></a> <span class='hs-keyword'>where</span>
<a name="line-295"></a> <span class='hs-varid'>cls</span> <span class='hs-keyglyph'>|</span> <span class='hs-sel'>_generateClasses</span> <span class='hs-varid'>rules</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>makeClassyClass</span> <span class='hs-varid'>className</span> <span class='hs-varid'>methodName</span> <span class='hs-varid'>s</span> <span class='hs-varid'>defs</span><span class='hs-keyglyph'>]</span>
<a name="line-296"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-297"></a>
<a name="line-298"></a> <span class='hs-varid'>inst</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>makeClassyInstance</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>className</span> <span class='hs-varid'>methodName</span> <span class='hs-varid'>s</span> <span class='hs-varid'>defs</span><span class='hs-keyglyph'>]</span>
<a name="line-299"></a>
<a name="line-300"></a>
<a name="line-301"></a><a name="makeClassyClass"></a><span class='hs-definition'>makeClassyClass</span> <span class='hs-keyglyph'>::</span>
<a name="line-302"></a> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span>
<a name="line-303"></a> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span>
<a name="line-304"></a> <span class='hs-conid'>Type</span> <span class='hs-comment'>{- ^ Outer 's' type -}</span> <span class='hs-keyglyph'>-></span>
<a name="line-305"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>DefName</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conid'>OpticType</span><span class='hs-layout'>,</span> <span class='hs-conid'>OpticStab</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Name</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span>
<a name="line-306"></a> <span class='hs-conid'>DecQ</span>
<a name="line-307"></a><span class='hs-definition'>makeClassyClass</span> <span class='hs-varid'>className</span> <span class='hs-varid'>methodName</span> <span class='hs-varid'>s</span> <span class='hs-varid'>defs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-308"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>ss</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>stabToS</span> <span class='hs-varop'>.</span> <span class='hs-varid'>view</span> <span class='hs-layout'>(</span><span class='hs-sel'>_2</span> <span class='hs-varop'>.</span> <span class='hs-sel'>_2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>defs</span>
<a name="line-309"></a> <span class='hs-layout'>(</span><span class='hs-varid'>sub</span><span class='hs-layout'>,</span><span class='hs-varid'>s'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unifyTypes</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span> <span class='hs-conop'>:</span> <span class='hs-varid'>ss</span><span class='hs-layout'>)</span>
<a name="line-310"></a> <span class='hs-varid'>c</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newName</span> <span class='hs-str'>"c"</span>
<a name="line-311"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>vars</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toListOf</span> <span class='hs-varid'>typeVars</span> <span class='hs-varid'>s'</span>
<a name="line-312"></a> <span class='hs-varid'>fd</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>vars</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-313"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>FunDep</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>c</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>vars</span><span class='hs-keyglyph'>]</span>
<a name="line-314"></a>
<a name="line-315"></a>
<a name="line-316"></a> <span class='hs-varid'>classD</span> <span class='hs-layout'>(</span><span class='hs-varid'>cxt</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varid'>className</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-conid'>PlainTV</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>vars</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>fd</span>
<a name="line-317"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>sigD</span> <span class='hs-varid'>methodName</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>lens'TypeName</span> <span class='hs-varop'>`conAppsT`</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>VarT</span> <span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-varid'>s'</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-318"></a> <span class='hs-conop'>:</span> <span class='hs-varid'>concat</span>
<a name="line-319"></a> <span class='hs-keyglyph'>[</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>sigD</span> <span class='hs-varid'>defName</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varid'>ty</span><span class='hs-layout'>)</span>
<a name="line-320"></a> <span class='hs-layout'>,</span><span class='hs-varid'>valD</span> <span class='hs-layout'>(</span><span class='hs-varid'>varP</span> <span class='hs-varid'>defName</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>normalB</span> <span class='hs-varid'>body</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span>
<a name="line-321"></a> <span class='hs-keyglyph'>]</span> <span class='hs-varop'>++</span>
<a name="line-322"></a> <span class='hs-varid'>inlinePragma</span> <span class='hs-varid'>defName</span>
<a name="line-323"></a> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-conid'>TopName</span> <span class='hs-varid'>defName</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>stab</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>defs</span>
<a name="line-324"></a> <span class='hs-layout'>,</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>body</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>appsE</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>varE</span> <span class='hs-varid'>composeValName</span><span class='hs-layout'>,</span> <span class='hs-varid'>varE</span> <span class='hs-varid'>methodName</span><span class='hs-layout'>,</span> <span class='hs-varid'>varE</span> <span class='hs-varid'>defName</span><span class='hs-keyglyph'>]</span>
<a name="line-325"></a> <span class='hs-layout'>,</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>ty</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>quantifyType'</span> <span class='hs-layout'>(</span><span class='hs-conid'>Set</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>vars</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-326"></a> <span class='hs-layout'>(</span><span class='hs-varid'>stabToContext</span> <span class='hs-varid'>stab</span><span class='hs-layout'>)</span>
<a name="line-327"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>stabToOptic</span> <span class='hs-varid'>stab</span> <span class='hs-varop'>`conAppsT`</span>
<a name="line-328"></a> <span class='hs-keyglyph'>[</span><span class='hs-conid'>VarT</span> <span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-varid'>applyTypeSubst</span> <span class='hs-varid'>sub</span> <span class='hs-layout'>(</span><span class='hs-varid'>stabToA</span> <span class='hs-varid'>stab</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-329"></a> <span class='hs-keyglyph'>]</span>
<a name="line-330"></a>
<a name="line-331"></a>
<a name="line-332"></a><a name="makeClassyInstance"></a><span class='hs-definition'>makeClassyInstance</span> <span class='hs-keyglyph'>::</span>
<a name="line-333"></a> <span class='hs-conid'>LensRules</span> <span class='hs-keyglyph'>-></span>
<a name="line-334"></a> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span>
<a name="line-335"></a> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span>
<a name="line-336"></a> <span class='hs-conid'>Type</span> <span class='hs-comment'>{- ^ Outer 's' type -}</span> <span class='hs-keyglyph'>-></span>
<a name="line-337"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>DefName</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conid'>OpticType</span><span class='hs-layout'>,</span> <span class='hs-conid'>OpticStab</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Name</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span>
<a name="line-338"></a> <span class='hs-conid'>DecQ</span>
<a name="line-339"></a><span class='hs-definition'>makeClassyInstance</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>className</span> <span class='hs-varid'>methodName</span> <span class='hs-varid'>s</span> <span class='hs-varid'>defs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-340"></a> <span class='hs-varid'>methodss</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>traverse</span> <span class='hs-layout'>(</span><span class='hs-varid'>makeFieldOptic</span> <span class='hs-varid'>rules'</span><span class='hs-layout'>)</span> <span class='hs-varid'>defs</span>
<a name="line-341"></a>
<a name="line-342"></a> <span class='hs-varid'>instanceD</span> <span class='hs-layout'>(</span><span class='hs-varid'>cxt</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varid'>instanceHead</span><span class='hs-layout'>)</span>
<a name="line-343"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>valD</span> <span class='hs-layout'>(</span><span class='hs-varid'>varP</span> <span class='hs-varid'>methodName</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>normalB</span> <span class='hs-layout'>(</span><span class='hs-varid'>varE</span> <span class='hs-varid'>idValName</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span>
<a name="line-344"></a> <span class='hs-conop'>:</span> <span class='hs-varid'>map</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>concat</span> <span class='hs-varid'>methodss</span><span class='hs-layout'>)</span>
<a name="line-345"></a>
<a name="line-346"></a> <span class='hs-keyword'>where</span>
<a name="line-347"></a> <span class='hs-varid'>instanceHead</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>className</span> <span class='hs-varop'>`conAppsT`</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span> <span class='hs-conop'>:</span> <span class='hs-varid'>map</span> <span class='hs-conid'>VarT</span> <span class='hs-varid'>vars</span><span class='hs-layout'>)</span>
<a name="line-348"></a> <span class='hs-varid'>vars</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toListOf</span> <span class='hs-varid'>typeVars</span> <span class='hs-varid'>s</span>
<a name="line-349"></a> <span class='hs-varid'>rules'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rules</span> <span class='hs-layout'>{</span> <span class='hs-sel'>_generateSigs</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-350"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_generateClasses</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-351"></a> <span class='hs-layout'>}</span>
<a name="line-352"></a>
<a name="line-353"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-354"></a><span class='hs-comment'>-- Field class generation</span>
<a name="line-355"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-356"></a>
<a name="line-357"></a><a name="makeFieldClass"></a><span class='hs-definition'>makeFieldClass</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OpticStab</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecQ</span>
<a name="line-358"></a><span class='hs-definition'>makeFieldClass</span> <span class='hs-varid'>defType</span> <span class='hs-varid'>className</span> <span class='hs-varid'>methodName</span> <span class='hs-keyglyph'>=</span>
<a name="line-359"></a> <span class='hs-varid'>classD</span> <span class='hs-layout'>(</span><span class='hs-varid'>cxt</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varid'>className</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>PlainTV</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-conid'>PlainTV</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>FunDep</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>s</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span><span class='hs-keyglyph'>]</span>
<a name="line-360"></a> <span class='hs-keyglyph'>[</span><span class='hs-varid'>sigD</span> <span class='hs-varid'>methodName</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varid'>methodType</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-361"></a> <span class='hs-keyword'>where</span>
<a name="line-362"></a> <span class='hs-varid'>methodType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>quantifyType'</span> <span class='hs-layout'>(</span><span class='hs-conid'>Set</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-363"></a> <span class='hs-layout'>(</span><span class='hs-varid'>stabToContext</span> <span class='hs-varid'>defType</span><span class='hs-layout'>)</span>
<a name="line-364"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>stabToOptic</span> <span class='hs-varid'>defType</span> <span class='hs-varop'>`conAppsT`</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>VarT</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span><span class='hs-conid'>VarT</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-365"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkName</span> <span class='hs-str'>"s"</span>
<a name="line-366"></a> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkName</span> <span class='hs-str'>"a"</span>
<a name="line-367"></a>
<a name="line-368"></a><a name="makeFieldInstance"></a><span class='hs-definition'>makeFieldInstance</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OpticStab</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DecQ</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecQ</span>
<a name="line-369"></a><span class='hs-definition'>makeFieldInstance</span> <span class='hs-varid'>defType</span> <span class='hs-varid'>className</span> <span class='hs-keyglyph'>=</span>
<a name="line-370"></a> <span class='hs-varid'>instanceD</span> <span class='hs-layout'>(</span><span class='hs-varid'>cxt</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-371"></a> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>className</span> <span class='hs-varop'>`conAppsT`</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>stabToS</span> <span class='hs-varid'>defType</span><span class='hs-layout'>,</span> <span class='hs-varid'>stabToA</span> <span class='hs-varid'>defType</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-372"></a>
<a name="line-373"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-374"></a><span class='hs-comment'>-- Optic clause generators</span>
<a name="line-375"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-376"></a>
<a name="line-377"></a>
<a name="line-378"></a><a name="makeFieldClauses"></a><span class='hs-definition'>makeFieldClauses</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensRules</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>OpticType</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Name</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>ClauseQ</span><span class='hs-keyglyph'>]</span>
<a name="line-379"></a><span class='hs-definition'>makeFieldClauses</span> <span class='hs-varid'>rules</span> <span class='hs-varid'>opticType</span> <span class='hs-varid'>cons</span> <span class='hs-keyglyph'>=</span>
<a name="line-380"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>opticType</span> <span class='hs-keyword'>of</span>
<a name="line-381"></a>
<a name="line-382"></a> <span class='hs-conid'>IsoType</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>makeIsoClause</span> <span class='hs-varid'>conName</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>conName</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>cons</span> <span class='hs-keyglyph'>]</span>
<a name="line-383"></a>
<a name="line-384"></a> <span class='hs-conid'>GetterType</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>makeGetterClause</span> <span class='hs-varid'>conName</span> <span class='hs-varid'>fieldCount</span> <span class='hs-varid'>fields</span>
<a name="line-385"></a> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>conName</span><span class='hs-layout'>,</span> <span class='hs-varid'>fieldCount</span><span class='hs-layout'>,</span> <span class='hs-varid'>fields</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>cons</span> <span class='hs-keyglyph'>]</span>
<a name="line-386"></a>
<a name="line-387"></a> <span class='hs-conid'>LensType</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>makeFieldOpticClause</span> <span class='hs-varid'>conName</span> <span class='hs-varid'>fieldCount</span> <span class='hs-varid'>fields</span> <span class='hs-varid'>irref</span>
<a name="line-388"></a> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>conName</span><span class='hs-layout'>,</span> <span class='hs-varid'>fieldCount</span><span class='hs-layout'>,</span> <span class='hs-varid'>fields</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>cons</span> <span class='hs-keyglyph'>]</span>
<a name="line-389"></a> <span class='hs-keyword'>where</span>
<a name="line-390"></a> <span class='hs-varid'>irref</span> <span class='hs-keyglyph'>=</span> <span class='hs-sel'>_lazyPatterns</span> <span class='hs-varid'>rules</span>
<a name="line-391"></a> <span class='hs-varop'>&&</span> <span class='hs-varid'>length</span> <span class='hs-varid'>cons</span> <span class='hs-varop'>==</span> <span class='hs-num'>1</span>
<a name="line-392"></a>
<a name="line-393"></a>
<a name="line-394"></a>
<a name="line-395"></a><a name="makePureClause"></a><span class='hs-comment'>-- | Construct an optic clause that returns an unmodified value</span>
<a name="line-396"></a><span class='hs-comment'>-- given a constructor name and the number of fields on that</span>
<a name="line-397"></a><span class='hs-comment'>-- constructor.</span>
<a name="line-398"></a><span class='hs-definition'>makePureClause</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ClauseQ</span>
<a name="line-399"></a><span class='hs-definition'>makePureClause</span> <span class='hs-varid'>conName</span> <span class='hs-varid'>fieldCount</span> <span class='hs-keyglyph'>=</span>
<a name="line-400"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>replicateM</span> <span class='hs-varid'>fieldCount</span> <span class='hs-layout'>(</span><span class='hs-varid'>newName</span> <span class='hs-str'>"x"</span><span class='hs-layout'>)</span>
<a name="line-401"></a> <span class='hs-comment'>-- clause: _ (Con x1..xn) = pure (Con x1..xn)</span>
<a name="line-402"></a> <span class='hs-varid'>clause</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>wildP</span><span class='hs-layout'>,</span> <span class='hs-varid'>conP</span> <span class='hs-varid'>conName</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>varP</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-403"></a> <span class='hs-layout'>(</span><span class='hs-varid'>normalB</span> <span class='hs-layout'>(</span><span class='hs-varid'>appE</span> <span class='hs-layout'>(</span><span class='hs-varid'>varE</span> <span class='hs-varid'>pureValName</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>appsE</span> <span class='hs-layout'>(</span><span class='hs-varid'>conE</span> <span class='hs-varid'>conName</span> <span class='hs-conop'>:</span> <span class='hs-varid'>map</span> <span class='hs-varid'>varE</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-404"></a> <span class='hs-conid'>[]</span>
<a name="line-405"></a>
<a name="line-406"></a>
<a name="line-407"></a><a name="makeGetterClause"></a><span class='hs-comment'>-- | Construct an optic clause suitable for a Getter or Fold</span>
<a name="line-408"></a><span class='hs-comment'>-- by visited the fields identified by their 0 indexed positions</span>
<a name="line-409"></a><span class='hs-definition'>makeGetterClause</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ClauseQ</span>
<a name="line-410"></a><span class='hs-definition'>makeGetterClause</span> <span class='hs-varid'>conName</span> <span class='hs-varid'>fieldCount</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makePureClause</span> <span class='hs-varid'>conName</span> <span class='hs-varid'>fieldCount</span>
<a name="line-411"></a><span class='hs-definition'>makeGetterClause</span> <span class='hs-varid'>conName</span> <span class='hs-varid'>fieldCount</span> <span class='hs-varid'>fields</span> <span class='hs-keyglyph'>=</span>
<a name="line-412"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newName</span> <span class='hs-str'>"f"</span>
<a name="line-413"></a> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>replicateM</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-varid'>fields</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>newName</span> <span class='hs-str'>"x"</span><span class='hs-layout'>)</span>
<a name="line-414"></a>
<a name="line-415"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>pats</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-conop'>:</span><span class='hs-varid'>is</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-conop'>:</span><span class='hs-varid'>ys</span><span class='hs-layout'>)</span>
<a name="line-416"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>fields</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>varP</span> <span class='hs-varid'>y</span> <span class='hs-conop'>:</span> <span class='hs-varid'>pats</span> <span class='hs-varid'>is</span> <span class='hs-varid'>ys</span>
<a name="line-417"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>wildP</span> <span class='hs-conop'>:</span> <span class='hs-varid'>pats</span> <span class='hs-varid'>is</span> <span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-conop'>:</span><span class='hs-varid'>ys</span><span class='hs-layout'>)</span>
<a name="line-418"></a> <span class='hs-varid'>pats</span> <span class='hs-varid'>is</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-varid'>wildP</span><span class='hs-layout'>)</span> <span class='hs-varid'>is</span>
<a name="line-419"></a>
<a name="line-420"></a> <span class='hs-varid'>fxs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>appE</span> <span class='hs-layout'>(</span><span class='hs-varid'>varE</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>varE</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>]</span>
<a name="line-421"></a> <span class='hs-varid'>body</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldl</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>appsE</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>varE</span> <span class='hs-varid'>apValName</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-422"></a> <span class='hs-layout'>(</span><span class='hs-varid'>appE</span> <span class='hs-layout'>(</span><span class='hs-varid'>varE</span> <span class='hs-varid'>phantomValName</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>head</span> <span class='hs-varid'>fxs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-423"></a> <span class='hs-layout'>(</span><span class='hs-varid'>tail</span> <span class='hs-varid'>fxs</span><span class='hs-layout'>)</span>
<a name="line-424"></a>
<a name="line-425"></a> <span class='hs-comment'>-- clause f (Con x1..xn) = coerce (f x1) <*> ... <*> f xn</span>
<a name="line-426"></a> <span class='hs-varid'>clause</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>varP</span> <span class='hs-varid'>f</span><span class='hs-layout'>,</span> <span class='hs-varid'>conP</span> <span class='hs-varid'>conName</span> <span class='hs-layout'>(</span><span class='hs-varid'>pats</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>0</span><span class='hs-keyglyph'>..</span><span class='hs-varid'>fieldCount</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-427"></a> <span class='hs-layout'>(</span><span class='hs-varid'>normalB</span> <span class='hs-varid'>body</span><span class='hs-layout'>)</span>
<a name="line-428"></a> <span class='hs-conid'>[]</span>
<a name="line-429"></a>
<a name="line-430"></a><a name="makeFieldOpticClause"></a><span class='hs-comment'>-- | Build a clause that updates the field at the given indexes</span>
<a name="line-431"></a><span class='hs-comment'>-- When irref is 'True' the value with me matched with an irrefutable</span>
<a name="line-432"></a><span class='hs-comment'>-- pattern. This is suitable for Lens and Traversal construction</span>
<a name="line-433"></a><span class='hs-definition'>makeFieldOpticClause</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ClauseQ</span>
<a name="line-434"></a><span class='hs-definition'>makeFieldOpticClause</span> <span class='hs-varid'>conName</span> <span class='hs-varid'>fieldCount</span> <span class='hs-conid'>[]</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span>
<a name="line-435"></a> <span class='hs-varid'>makePureClause</span> <span class='hs-varid'>conName</span> <span class='hs-varid'>fieldCount</span>
<a name="line-436"></a><span class='hs-definition'>makeFieldOpticClause</span> <span class='hs-varid'>conName</span> <span class='hs-varid'>fieldCount</span> <span class='hs-layout'>(</span><span class='hs-varid'>field</span><span class='hs-conop'>:</span><span class='hs-varid'>fields</span><span class='hs-layout'>)</span> <span class='hs-varid'>irref</span> <span class='hs-keyglyph'>=</span>
<a name="line-437"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newName</span> <span class='hs-str'>"f"</span>
<a name="line-438"></a> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>replicateM</span> <span class='hs-varid'>fieldCount</span> <span class='hs-layout'>(</span><span class='hs-varid'>newName</span> <span class='hs-str'>"x"</span><span class='hs-layout'>)</span>
<a name="line-439"></a> <span class='hs-varid'>ys</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>replicateM</span> <span class='hs-layout'>(</span><span class='hs-num'>1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>length</span> <span class='hs-varid'>fields</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>newName</span> <span class='hs-str'>"y"</span><span class='hs-layout'>)</span>
<a name="line-440"></a>
<a name="line-441"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>xs'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-layout'>,</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>set</span> <span class='hs-layout'>(</span><span class='hs-varid'>ix</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span> <span class='hs-layout'>(</span><span class='hs-varid'>zip</span> <span class='hs-layout'>(</span><span class='hs-varid'>field</span><span class='hs-conop'>:</span><span class='hs-varid'>fields</span><span class='hs-layout'>)</span> <span class='hs-varid'>ys</span><span class='hs-layout'>)</span>
<a name="line-442"></a>
<a name="line-443"></a> <span class='hs-varid'>mkFx</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>appE</span> <span class='hs-layout'>(</span><span class='hs-varid'>varE</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>varE</span> <span class='hs-layout'>(</span><span class='hs-varid'>xs</span> <span class='hs-varop'>!!</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-444"></a>
<a name="line-445"></a> <span class='hs-varid'>body0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>appsE</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>varE</span> <span class='hs-varid'>fmapValName</span>
<a name="line-446"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>lamE</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>varP</span> <span class='hs-varid'>ys</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>appsE</span> <span class='hs-layout'>(</span><span class='hs-varid'>conE</span> <span class='hs-varid'>conName</span> <span class='hs-conop'>:</span> <span class='hs-varid'>map</span> <span class='hs-varid'>varE</span> <span class='hs-varid'>xs'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-447"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkFx</span> <span class='hs-varid'>field</span>
<a name="line-448"></a> <span class='hs-keyglyph'>]</span>
<a name="line-449"></a>
<a name="line-450"></a> <span class='hs-varid'>body</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldl</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>appsE</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>varE</span> <span class='hs-varid'>apValName</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>mkFx</span> <span class='hs-varid'>b</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-varid'>body0</span> <span class='hs-varid'>fields</span>
<a name="line-451"></a>
<a name="line-452"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>wrap</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>irref</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>tildeP</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>id</span>
<a name="line-453"></a>
<a name="line-454"></a> <span class='hs-varid'>clause</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>varP</span> <span class='hs-varid'>f</span><span class='hs-layout'>,</span> <span class='hs-varid'>wrap</span> <span class='hs-layout'>(</span><span class='hs-varid'>conP</span> <span class='hs-varid'>conName</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>varP</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-455"></a> <span class='hs-layout'>(</span><span class='hs-varid'>normalB</span> <span class='hs-varid'>body</span><span class='hs-layout'>)</span>
<a name="line-456"></a> <span class='hs-conid'>[]</span>
<a name="line-457"></a>
<a name="line-458"></a>
<a name="line-459"></a><a name="makeIsoClause"></a><span class='hs-comment'>-- | Build a clause that constructs an Iso</span>
<a name="line-460"></a><span class='hs-definition'>makeIsoClause</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ClauseQ</span>
<a name="line-461"></a><span class='hs-definition'>makeIsoClause</span> <span class='hs-varid'>conName</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>clause</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-varid'>normalB</span> <span class='hs-layout'>(</span><span class='hs-varid'>appsE</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>varE</span> <span class='hs-varid'>isoValName</span><span class='hs-layout'>,</span> <span class='hs-varid'>destruct</span><span class='hs-layout'>,</span> <span class='hs-varid'>construct</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span>
<a name="line-462"></a> <span class='hs-keyword'>where</span>
<a name="line-463"></a> <span class='hs-varid'>destruct</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newName</span> <span class='hs-str'>"x"</span>
<a name="line-464"></a> <span class='hs-varid'>lam1E</span> <span class='hs-layout'>(</span><span class='hs-varid'>conP</span> <span class='hs-varid'>conName</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>varP</span> <span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>varE</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-465"></a>
<a name="line-466"></a> <span class='hs-varid'>construct</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>conE</span> <span class='hs-varid'>conName</span>
<a name="line-467"></a>
<a name="line-468"></a>
<a name="line-469"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-470"></a><span class='hs-comment'>-- Unification logic</span>
<a name="line-471"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-472"></a>
<a name="line-473"></a><span class='hs-comment'>-- The field-oriented optic generation supports incorporating fields</span>
<a name="line-474"></a><span class='hs-comment'>-- with distinct but unifiable types into a single definition.</span>
<a name="line-475"></a>
<a name="line-476"></a>
<a name="line-477"></a>
<a name="line-478"></a><a name="unifyTypes"></a><span class='hs-comment'>-- | Unify the given list of types, if possible, and return the</span>
<a name="line-479"></a><span class='hs-comment'>-- substitution used to unify the types for unifying the outer</span>
<a name="line-480"></a><span class='hs-comment'>-- type when building a definition's type signature.</span>
<a name="line-481"></a><span class='hs-definition'>unifyTypes</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Type</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Q</span> <span class='hs-layout'>(</span><span class='hs-conid'>Map</span> <span class='hs-conid'>Name</span> <span class='hs-conid'>Type</span><span class='hs-layout'>,</span> <span class='hs-conid'>Type</span><span class='hs-layout'>)</span>
<a name="line-482"></a><span class='hs-definition'>unifyTypes</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldM</span> <span class='hs-layout'>(</span><span class='hs-varid'>uncurry</span> <span class='hs-varid'>unify1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span>
<a name="line-483"></a><span class='hs-definition'>unifyTypes</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"unifyTypes: Bug: Unexpected empty list"</span>
<a name="line-484"></a>
<a name="line-485"></a>
<a name="line-486"></a><a name="unify1"></a><span class='hs-comment'>-- | Attempt to unify two given types using a running substitution</span>
<a name="line-487"></a><span class='hs-definition'>unify1</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Map</span> <span class='hs-conid'>Name</span> <span class='hs-conid'>Type</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Type</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Type</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Q</span> <span class='hs-layout'>(</span><span class='hs-conid'>Map</span> <span class='hs-conid'>Name</span> <span class='hs-conid'>Type</span><span class='hs-layout'>,</span> <span class='hs-conid'>Type</span><span class='hs-layout'>)</span>
<a name="line-488"></a><span class='hs-definition'>unify1</span> <span class='hs-varid'>sub</span> <span class='hs-layout'>(</span><span class='hs-conid'>VarT</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>y</span>
<a name="line-489"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>x</span> <span class='hs-varid'>sub</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unify1</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>r</span> <span class='hs-varid'>y</span>
<a name="line-490"></a><span class='hs-definition'>unify1</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-conid'>VarT</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-491"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>y</span> <span class='hs-varid'>sub</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unify1</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>x</span> <span class='hs-varid'>r</span>
<a name="line-492"></a><span class='hs-definition'>unify1</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span>
<a name="line-493"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>sub</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-494"></a><span class='hs-definition'>unify1</span> <span class='hs-varid'>sub</span> <span class='hs-layout'>(</span><span class='hs-conid'>AppT</span> <span class='hs-varid'>f1</span> <span class='hs-varid'>x1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>AppT</span> <span class='hs-varid'>f2</span> <span class='hs-varid'>x2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-495"></a> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>sub1</span><span class='hs-layout'>,</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unify1</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>f1</span> <span class='hs-varid'>f2</span>
<a name="line-496"></a> <span class='hs-layout'>(</span><span class='hs-varid'>sub2</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unify1</span> <span class='hs-varid'>sub1</span> <span class='hs-varid'>x1</span> <span class='hs-varid'>x2</span>
<a name="line-497"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>sub2</span><span class='hs-layout'>,</span> <span class='hs-conid'>AppT</span> <span class='hs-layout'>(</span><span class='hs-varid'>applyTypeSubst</span> <span class='hs-varid'>sub2</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-498"></a><span class='hs-definition'>unify1</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-conid'>VarT</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-499"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>elemOf</span> <span class='hs-varid'>typeVars</span> <span class='hs-varid'>y</span> <span class='hs-layout'>(</span><span class='hs-varid'>applyTypeSubst</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-500"></a> <span class='hs-varid'>fail</span> <span class='hs-str'>"Failed to unify types: occurs check"</span>
<a name="line-501"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>insert</span> <span class='hs-varid'>y</span> <span class='hs-varid'>x</span> <span class='hs-varid'>sub</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-502"></a><span class='hs-definition'>unify1</span> <span class='hs-varid'>sub</span> <span class='hs-layout'>(</span><span class='hs-conid'>VarT</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unify1</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>y</span> <span class='hs-layout'>(</span><span class='hs-conid'>VarT</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-503"></a>
<a name="line-504"></a><span class='hs-comment'>-- TODO: Unify contexts</span>
<a name="line-505"></a><span class='hs-definition'>unify1</span> <span class='hs-varid'>sub</span> <span class='hs-layout'>(</span><span class='hs-conid'>ForallT</span> <span class='hs-varid'>v1</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>t1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ForallT</span> <span class='hs-varid'>v2</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>t2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-506"></a> <span class='hs-comment'>-- This approach works out because by the time this code runs</span>
<a name="line-507"></a> <span class='hs-comment'>-- all of the type variables have been renamed. No risk of shadowing.</span>
<a name="line-508"></a> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>sub1</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unify1</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>t1</span> <span class='hs-varid'>t2</span>
<a name="line-509"></a> <span class='hs-varid'>v</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>nub</span> <span class='hs-layout'>(</span><span class='hs-varid'>traverse</span> <span class='hs-layout'>(</span><span class='hs-varid'>limitedSubst</span> <span class='hs-varid'>sub1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>v1</span><span class='hs-varop'>++</span><span class='hs-varid'>v2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-510"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>sub1</span><span class='hs-layout'>,</span> <span class='hs-conid'>ForallT</span> <span class='hs-varid'>v</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-511"></a>
<a name="line-512"></a><span class='hs-definition'>unify1</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-layout'>(</span><span class='hs-str'>"Failed to unify types: "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-513"></a>
<a name="line-514"></a>
<a name="line-515"></a><a name="limitedSubst"></a><span class='hs-comment'>-- | Perform a limited substitution on type variables. This is used</span>
<a name="line-516"></a><span class='hs-comment'>-- when unifying rank-2 fields when trying to achieve a Getter or Fold.</span>
<a name="line-517"></a><span class='hs-definition'>limitedSubst</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Map</span> <span class='hs-conid'>Name</span> <span class='hs-conid'>Type</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TyVarBndr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Q</span> <span class='hs-conid'>TyVarBndr</span>
<a name="line-518"></a><span class='hs-definition'>limitedSubst</span> <span class='hs-varid'>sub</span> <span class='hs-layout'>(</span><span class='hs-conid'>PlainTV</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-519"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>n</span> <span class='hs-varid'>sub</span> <span class='hs-keyglyph'>=</span>
<a name="line-520"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-521"></a> <span class='hs-conid'>VarT</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>limitedSubst</span> <span class='hs-varid'>sub</span> <span class='hs-layout'>(</span><span class='hs-conid'>PlainTV</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-522"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Unable to unify exotic higher-rank type"</span>
<a name="line-523"></a><span class='hs-definition'>limitedSubst</span> <span class='hs-varid'>sub</span> <span class='hs-layout'>(</span><span class='hs-conid'>KindedTV</span> <span class='hs-varid'>n</span> <span class='hs-varid'>k</span><span class='hs-layout'>)</span>
<a name="line-524"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>n</span> <span class='hs-varid'>sub</span> <span class='hs-keyglyph'>=</span>
<a name="line-525"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-526"></a> <span class='hs-conid'>VarT</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>limitedSubst</span> <span class='hs-varid'>sub</span> <span class='hs-layout'>(</span><span class='hs-conid'>KindedTV</span> <span class='hs-varid'>m</span> <span class='hs-varid'>k</span><span class='hs-layout'>)</span>
<a name="line-527"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Unable to unify exotic higher-rank type"</span>
<a name="line-528"></a><span class='hs-definition'>limitedSubst</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>tv</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varid'>tv</span>
<a name="line-529"></a>
<a name="line-530"></a>
<a name="line-531"></a><a name="applyTypeSubst"></a><span class='hs-comment'>-- | Apply a substitution to a type. This is used after unifying</span>
<a name="line-532"></a><span class='hs-comment'>-- the types of the fields in unifyTypes.</span>
<a name="line-533"></a><span class='hs-definition'>applyTypeSubst</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Map</span> <span class='hs-conid'>Name</span> <span class='hs-conid'>Type</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Type</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Type</span>
<a name="line-534"></a><span class='hs-definition'>applyTypeSubst</span> <span class='hs-varid'>sub</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rewrite</span> <span class='hs-varid'>aux</span>
<a name="line-535"></a> <span class='hs-keyword'>where</span>
<a name="line-536"></a> <span class='hs-varid'>aux</span> <span class='hs-layout'>(</span><span class='hs-conid'>VarT</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>n</span> <span class='hs-varid'>sub</span>
<a name="line-537"></a> <span class='hs-varid'>aux</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-538"></a>
<a name="line-539"></a>
<a name="line-540"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-541"></a><span class='hs-comment'>-- Field generation parameters</span>
<a name="line-542"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-543"></a>
<a name="line-544"></a>
<a name="line-545"></a><a name="LensRules"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>LensRules</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LensRules</span>
<a name="line-546"></a> <span class='hs-layout'>{</span> <span class='hs-sel'>_simpleLenses</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span>
<a name="line-547"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_generateSigs</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span>
<a name="line-548"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_generateClasses</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span>
<a name="line-549"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_allowIsos</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span>
<a name="line-550"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_allowUpdates</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span> <span class='hs-comment'>-- ^ Allow Lens/Traversal (otherwise Getter/Fold)</span>
<a name="line-551"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_lazyPatterns</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span>
<a name="line-552"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_fieldToDef</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Name</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DefName</span><span class='hs-keyglyph'>]</span>
<a name="line-553"></a> <span class='hs-comment'>-- ^ Type Name -> Field Names -> Target Field Name -> Definition Names</span>
<a name="line-554"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_classyLenses</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Name</span><span class='hs-layout'>,</span><span class='hs-conid'>Name</span><span class='hs-layout'>)</span>
<a name="line-555"></a> <span class='hs-comment'>-- type name to class name and top method</span>
<a name="line-556"></a> <span class='hs-layout'>}</span>
<a name="line-557"></a>
<a name="line-558"></a>
<a name="line-559"></a><a name="DefName"></a><span class='hs-comment'>-- | Name to give to generated field optics.</span>
<a name="line-560"></a><a name="DefName"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>DefName</span>
<a name="line-561"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TopName</span> <span class='hs-conid'>Name</span> <span class='hs-comment'>-- ^ Simple top-level definiton name</span>
<a name="line-562"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>MethodName</span> <span class='hs-conid'>Name</span> <span class='hs-conid'>Name</span> <span class='hs-comment'>-- ^ makeFields-style class name and method name</span>
<a name="line-563"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</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>
<a name="line-564"></a>
<a name="line-565"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-566"></a><span class='hs-comment'>-- Miscellaneous utility functions</span>
<a name="line-567"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-568"></a>
<a name="line-569"></a>
<a name="line-570"></a><a name="quantifyType"></a><span class='hs-comment'>-- | Template Haskell wants type variables declared in a forall, so</span>
<a name="line-571"></a><span class='hs-comment'>-- we find all free type variables in a given type and declare them.</span>
<a name="line-572"></a><span class='hs-definition'>quantifyType</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Cxt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Type</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Type</span>
<a name="line-573"></a><span class='hs-definition'>quantifyType</span> <span class='hs-varid'>c</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ForallT</span> <span class='hs-varid'>vs</span> <span class='hs-varid'>c</span> <span class='hs-varid'>t</span>
<a name="line-574"></a> <span class='hs-keyword'>where</span>
<a name="line-575"></a> <span class='hs-varid'>vs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-conid'>PlainTV</span> <span class='hs-layout'>(</span><span class='hs-varid'>toList</span> <span class='hs-layout'>(</span><span class='hs-varid'>setOf</span> <span class='hs-varid'>typeVars</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-576"></a>
<a name="line-577"></a><a name="quantifyType'"></a><span class='hs-comment'>-- | This function works like 'quantifyType' except that it takes</span>
<a name="line-578"></a><span class='hs-comment'>-- a list of variables to exclude from quantification.</span>
<a name="line-579"></a><span class='hs-definition'>quantifyType'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Set</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Cxt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Type</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Type</span>
<a name="line-580"></a><span class='hs-definition'>quantifyType'</span> <span class='hs-varid'>exclude</span> <span class='hs-varid'>c</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ForallT</span> <span class='hs-varid'>vs</span> <span class='hs-varid'>c</span> <span class='hs-varid'>t</span>
<a name="line-581"></a> <span class='hs-keyword'>where</span>
<a name="line-582"></a> <span class='hs-varid'>vs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-conid'>PlainTV</span> <span class='hs-layout'>(</span><span class='hs-varid'>toList</span> <span class='hs-layout'>(</span><span class='hs-varid'>setOf</span> <span class='hs-varid'>typeVars</span> <span class='hs-varid'>t</span> <span class='hs-conid'>Set</span><span class='hs-varop'>.\\</span> <span class='hs-varid'>exclude</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-583"></a>
<a name="line-584"></a>
<a name="line-585"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-586"></a><span class='hs-comment'>-- Support for generating inline pragmas</span>
<a name="line-587"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-588"></a>
<a name="line-589"></a><a name="inlinePragma"></a><span class='hs-definition'>inlinePragma</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DecQ</span><span class='hs-keyglyph'>]</span>
<a name="line-590"></a>
<a name="line-591"></a><span class='hs-cpp'>#ifdef INLINING</span>
<a name="line-592"></a>
<a name="line-593"></a><span class='hs-cpp'>#if MIN_VERSION_template_haskell(2,8,0)</span>
<a name="line-594"></a>
<a name="line-595"></a><span class='hs-cpp'># ifdef OLD_INLINE_PRAGMAS</span>
<a name="line-596"></a><span class='hs-comment'>-- 7.6rc1?</span>
<a name="line-597"></a><span class='hs-definition'>inlinePragma</span> <span class='hs-varid'>methodName</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>pragInlD</span> <span class='hs-varid'>methodName</span> <span class='hs-layout'>(</span><span class='hs-varid'>inlineSpecNoPhase</span> <span class='hs-conid'>Inline</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-598"></a><span class='hs-cpp'># else</span>
<a name="line-599"></a><span class='hs-comment'>-- 7.7.20120830</span>
<a name="line-600"></a><span class='hs-definition'>inlinePragma</span> <span class='hs-varid'>methodName</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>pragInlD</span> <span class='hs-varid'>methodName</span> <span class='hs-conid'>Inline</span> <span class='hs-conid'>FunLike</span> <span class='hs-conid'>AllPhases</span><span class='hs-keyglyph'>]</span>
<a name="line-601"></a><span class='hs-cpp'># endif</span>
<a name="line-602"></a>
<a name="line-603"></a><span class='hs-cpp'>#else</span>
<a name="line-604"></a><span class='hs-comment'>-- GHC <7.6, TH <2.8.0</span>
<a name="line-605"></a><span class='hs-definition'>inlinePragma</span> <span class='hs-varid'>methodName</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>pragInlD</span> <span class='hs-varid'>methodName</span> <span class='hs-layout'>(</span><span class='hs-varid'>inlineSpecNoPhase</span> <span class='hs-conid'>True</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-606"></a><span class='hs-cpp'>#endif</span>
<a name="line-607"></a>
<a name="line-608"></a><span class='hs-cpp'>#else</span>
<a name="line-609"></a>
<a name="line-610"></a><span class='hs-definition'>inlinePragma</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-611"></a>
<a name="line-612"></a><span class='hs-cpp'>#endif</span>
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