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<title>Data/Generics/UniplateStrOn.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{- |
<a name="line-2"></a>/RECOMMENDATION/: Use "Data.Generics.Uniplate.Operations" instead.
<a name="line-3"></a>
<a name="line-4"></a>This module retained Haskell 98 compatability, but users who are happy with
<a name="line-5"></a>multi-parameter type classes should look towards "Data.Generics.Biplate".
<a name="line-6"></a>
<a name="line-7"></a>The only function missing from "Data.Generics.Uniplate" is 'fold', as it can be
<a name="line-8"></a>constructed from 'children' and has little meaning in a multi-typed setting.
<a name="line-9"></a>
<a name="line-10"></a>All operations, apart from 'childrenOn', 'descendOn' and 'holesOn' should perform
<a name="line-11"></a>identically to their non @On@ counterparts.
<a name="line-12"></a>-}</span>
<a name="line-13"></a>
<a name="line-14"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Generics</span><span class='hs-varop'>.</span><span class='hs-conid'>UniplateStrOn</span><span class='hs-layout'>(</span>
<a name="line-15"></a> <span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Generics</span><span class='hs-varop'>.</span><span class='hs-conid'>UniplateStr</span><span class='hs-layout'>,</span>
<a name="line-16"></a> <span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Generics</span><span class='hs-varop'>.</span><span class='hs-conid'>UniplateStrOn</span>
<a name="line-17"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-layout'>(</span><span class='hs-varid'>liftM</span><span class='hs-layout'>)</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Traversable</span>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>mapM</span><span class='hs-layout'>)</span>
<a name="line-22"></a>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Generics</span><span class='hs-varop'>.</span><span class='hs-conid'>PlateInternal</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Generics</span><span class='hs-varop'>.</span><span class='hs-conid'>Str</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Generics</span><span class='hs-varop'>.</span><span class='hs-conid'>UniplateStr</span>
<a name="line-26"></a>
<a name="line-27"></a><span class='hs-comment'>-- * Types</span>
<a name="line-28"></a>
<a name="line-29"></a><a name="BiplateType"></a><span class='hs-comment'>-- | Return all the top most children of type @to@ within @from@.</span>
<a name="line-30"></a><a name="BiplateType"></a><span class='hs-comment'>--</span>
<a name="line-31"></a><a name="BiplateType"></a><span class='hs-comment'>-- If @from == to@ then this function should return the root as the single</span>
<a name="line-32"></a><a name="BiplateType"></a><span class='hs-comment'>-- child.</span>
<a name="line-33"></a><a name="BiplateType"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>BiplateType</span> <span class='hs-varid'>from</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>from</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Str</span> <span class='hs-varid'>to</span><span class='hs-layout'>,</span> <span class='hs-conid'>Str</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>from</span><span class='hs-layout'>)</span>
<a name="line-34"></a>
<a name="line-35"></a>
<a name="line-36"></a><span class='hs-comment'>-- * Operations</span>
<a name="line-37"></a>
<a name="line-38"></a><span class='hs-comment'>-- ** Queries</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="universeOn"></a><span class='hs-definition'>universeOn</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Uniplate</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>BiplateType</span> <span class='hs-varid'>from</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>from</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>to</span><span class='hs-keyglyph'>]</span>
<a name="line-41"></a><span class='hs-definition'>universeOn</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>builder</span> <span class='hs-varid'>f</span>
<a name="line-42"></a> <span class='hs-keyword'>where</span>
<a name="line-43"></a> <span class='hs-varid'>f</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>nil</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>g</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>nil</span> <span class='hs-layout'>(</span><span class='hs-varid'>fst</span> <span class='hs-varop'>$</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>nil</span>
<a name="line-44"></a> <span class='hs-varid'>g</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>nil</span> <span class='hs-conid'>Zero</span> <span class='hs-varid'>res</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>res</span>
<a name="line-45"></a> <span class='hs-varid'>g</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>nil</span> <span class='hs-layout'>(</span><span class='hs-conid'>One</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>res</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>`cons`</span> <span class='hs-varid'>g</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>nil</span> <span class='hs-layout'>(</span><span class='hs-varid'>fst</span> <span class='hs-varop'>$</span> <span class='hs-varid'>uniplate</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>res</span>
<a name="line-46"></a> <span class='hs-varid'>g</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>nil</span> <span class='hs-layout'>(</span><span class='hs-conid'>Two</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-varid'>res</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>g</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>nil</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-varid'>g</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>nil</span> <span class='hs-varid'>y</span> <span class='hs-varid'>res</span><span class='hs-layout'>)</span>
<a name="line-47"></a>
<a name="line-48"></a>
<a name="line-49"></a><a name="childrenOn"></a><span class='hs-comment'>-- | Return the children of a type. If @to == from@ then it returns the</span>
<a name="line-50"></a><span class='hs-comment'>-- original element (in contrast to 'children')</span>
<a name="line-51"></a><span class='hs-definition'>childrenOn</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Uniplate</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>BiplateType</span> <span class='hs-varid'>from</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>from</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>to</span><span class='hs-keyglyph'>]</span>
<a name="line-52"></a><span class='hs-definition'>childrenOn</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>builder</span> <span class='hs-varid'>f</span>
<a name="line-53"></a> <span class='hs-keyword'>where</span>
<a name="line-54"></a> <span class='hs-varid'>f</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>nil</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>g</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>nil</span> <span class='hs-layout'>(</span><span class='hs-varid'>fst</span> <span class='hs-varop'>$</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>nil</span>
<a name="line-55"></a> <span class='hs-varid'>g</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>nil</span> <span class='hs-conid'>Zero</span> <span class='hs-varid'>res</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>res</span>
<a name="line-56"></a> <span class='hs-varid'>g</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>nil</span> <span class='hs-layout'>(</span><span class='hs-conid'>One</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>res</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>`cons`</span> <span class='hs-varid'>res</span>
<a name="line-57"></a> <span class='hs-varid'>g</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>nil</span> <span class='hs-layout'>(</span><span class='hs-conid'>Two</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-varid'>res</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>g</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>nil</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-varid'>g</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>nil</span> <span class='hs-varid'>y</span> <span class='hs-varid'>res</span><span class='hs-layout'>)</span>
<a name="line-58"></a>
<a name="line-59"></a>
<a name="line-60"></a><span class='hs-comment'>-- ** Transformations</span>
<a name="line-61"></a>
<a name="line-62"></a><a name="transformOn"></a><span class='hs-definition'>transformOn</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Uniplate</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>BiplateType</span> <span class='hs-varid'>from</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>to</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>from</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>from</span>
<a name="line-63"></a><span class='hs-definition'>transformOn</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>generate</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-varid'>transform</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>current</span>
<a name="line-64"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>current</span><span class='hs-layout'>,</span> <span class='hs-varid'>generate</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>x</span>
<a name="line-65"></a>
<a name="line-66"></a>
<a name="line-67"></a><a name="transformOnM"></a><span class='hs-definition'>transformOnM</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Uniplate</span> <span class='hs-varid'>to</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>BiplateType</span> <span class='hs-varid'>from</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>to</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>from</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>from</span>
<a name="line-68"></a><span class='hs-definition'>transformOnM</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-varid'>generate</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mapM</span> <span class='hs-layout'>(</span><span class='hs-varid'>transformM</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>current</span>
<a name="line-69"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>current</span><span class='hs-layout'>,</span> <span class='hs-varid'>generate</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>x</span>
<a name="line-70"></a>
<a name="line-71"></a>
<a name="line-72"></a><a name="rewriteOn"></a><span class='hs-definition'>rewriteOn</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Uniplate</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>BiplateType</span> <span class='hs-varid'>from</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>to</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>from</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>from</span>
<a name="line-73"></a><span class='hs-definition'>rewriteOn</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>generate</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-varid'>rewrite</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>current</span>
<a name="line-74"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>current</span><span class='hs-layout'>,</span> <span class='hs-varid'>generate</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>x</span>
<a name="line-75"></a>
<a name="line-76"></a>
<a name="line-77"></a><a name="rewriteOnM"></a><span class='hs-definition'>rewriteOnM</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Uniplate</span> <span class='hs-varid'>to</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>BiplateType</span> <span class='hs-varid'>from</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>to</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>from</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>from</span>
<a name="line-78"></a><span class='hs-definition'>rewriteOnM</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-varid'>generate</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mapM</span> <span class='hs-layout'>(</span><span class='hs-varid'>rewriteM</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>current</span>
<a name="line-79"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>current</span><span class='hs-layout'>,</span> <span class='hs-varid'>generate</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>x</span>
<a name="line-80"></a>
<a name="line-81"></a>
<a name="line-82"></a><a name="descendOn"></a><span class='hs-definition'>descendOn</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Uniplate</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>BiplateType</span> <span class='hs-varid'>from</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>to</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>from</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>from</span>
<a name="line-83"></a><span class='hs-definition'>descendOn</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>generate</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-varid'>current</span>
<a name="line-84"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>current</span><span class='hs-layout'>,</span> <span class='hs-varid'>generate</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>x</span>
<a name="line-85"></a>
<a name="line-86"></a>
<a name="line-87"></a><a name="descendOnM"></a><span class='hs-definition'>descendOnM</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Uniplate</span> <span class='hs-varid'>to</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>BiplateType</span> <span class='hs-varid'>from</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>to</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>from</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>from</span>
<a name="line-88"></a><span class='hs-definition'>descendOnM</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-varid'>generate</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>f</span> <span class='hs-varid'>current</span>
<a name="line-89"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>current</span><span class='hs-layout'>,</span> <span class='hs-varid'>generate</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>x</span>
<a name="line-90"></a>
<a name="line-91"></a>
<a name="line-92"></a><a name="holesOn"></a><span class='hs-comment'>-- ** Other</span>
<a name="line-93"></a><span class='hs-definition'>holesOn</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Uniplate</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>BiplateType</span> <span class='hs-varid'>from</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>from</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>to</span><span class='hs-layout'>,</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>from</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-94"></a><span class='hs-definition'>holesOn</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>uncurry</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>biplate</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-95"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>f</span> <span class='hs-conid'>Zero</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-96"></a> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>One</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-varid'>generate</span> <span class='hs-keyglyph'>=</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'>generate</span> <span class='hs-varop'>.</span> <span class='hs-conid'>One</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-97"></a> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Two</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>gen</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-varid'>gen</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>i</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Two</span> <span class='hs-varid'>i</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-98"></a> <span class='hs-varop'>++</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-layout'>(</span><span class='hs-varid'>gen</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>i</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Two</span> <span class='hs-varid'>l</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-99"></a>
<a name="line-100"></a><a name="contextsOn"></a><span class='hs-definition'>contextsOn</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Uniplate</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>BiplateType</span> <span class='hs-varid'>from</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>from</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>to</span><span class='hs-layout'>,</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>from</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-101"></a><span class='hs-definition'>contextsOn</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>holesOn</span> <span class='hs-varid'>biplate</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-102"></a> <span class='hs-keyword'>where</span>
<a name="line-103"></a> <span class='hs-varid'>f</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-layout'>,</span> <span class='hs-varid'>ctx</span> <span class='hs-varop'>.</span> <span class='hs-varid'>context</span><span class='hs-layout'>)</span>
<a name="line-104"></a> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>child</span><span class='hs-layout'>,</span> <span class='hs-varid'>ctx</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>xs</span>
<a name="line-105"></a> <span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-layout'>,</span> <span class='hs-varid'>context</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>contexts</span> <span class='hs-varid'>child</span><span class='hs-keyglyph'>]</span>
<a name="line-106"></a>
<a name="line-107"></a><span class='hs-comment'>-- * Helper for writing instances</span>
<a name="line-108"></a>
<a name="line-109"></a><a name="uniplateOnList"></a><span class='hs-comment'>-- | Used for defining instances @UniplateFoo a => UniplateFoo [a]@</span>
<a name="line-110"></a><span class='hs-definition'>uniplateOnList</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BiplateType</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>BiplateType</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>b</span>
<a name="line-111"></a><span class='hs-definition'>uniplateOnList</span> <span class='hs-varid'>f</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Zero</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-112"></a><span class='hs-definition'>uniplateOnList</span> <span class='hs-varid'>f</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>
<a name="line-113"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Two</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>as</span><span class='hs-layout'>,</span>
<a name="line-114"></a> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-conid'>Two</span> <span class='hs-varid'>n</span> <span class='hs-varid'>ns</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-varid'>n</span> <span class='hs-conop'>:</span> <span class='hs-varid'>bs</span> <span class='hs-varid'>ns</span><span class='hs-layout'>)</span>
<a name="line-115"></a> <span class='hs-keyword'>where</span>
<a name="line-116"></a> <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'>f</span> <span class='hs-varid'>x</span>
<a name="line-117"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>as</span><span class='hs-layout'>,</span> <span class='hs-varid'>bs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>uniplateOnList</span> <span class='hs-varid'>f</span> <span class='hs-varid'>xs</span>
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