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<title>src/Control/Lens/Internal/TupleIxedTH.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 TemplateHaskell #-}</span>
<a name="line-3"></a>
<a name="line-4"></a><span class='hs-cpp'>#ifndef MIN_VERSION_template_haskell</span>
<a name="line-5"></a><span class='hs-cpp'>#define MIN_VERSION_template_haskell(x,y,z) 1</span>
<a name="line-6"></a><span class='hs-cpp'>#endif</span>
<a name="line-7"></a>
<a name="line-8"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-9"></a><span class='hs-comment'>-- |</span>
<a name="line-10"></a><span class='hs-comment'>-- Module : Control.Lens.Internal.TupleIxedTH</span>
<a name="line-11"></a><span class='hs-comment'>-- Copyright : (C) 2014 Edward Kmett</span>
<a name="line-12"></a><span class='hs-comment'>-- (C) 2012-13 Eric Mertens</span>
<a name="line-13"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-14"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-15"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-16"></a><span class='hs-comment'>-- Portability : non-portable</span>
<a name="line-17"></a><span class='hs-comment'>--</span>
<a name="line-18"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-19"></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'>TupleIxedTH</span>
<a name="line-20"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>makeAllTupleIxed</span>
<a name="line-21"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-22"></a>
<a name="line-23"></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-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Traversable</span> <span class='hs-layout'>(</span><span class='hs-varid'>traverse</span><span class='hs-layout'>)</span>
<a name="line-25"></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-26"></a>
<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>
<a name="line-29"></a><a name="indexN"></a><span class='hs-comment'>-- This module needs to be used by Control.Lens.At which defines these names</span>
<a name="line-30"></a><span class='hs-definition'>indexN</span><span class='hs-layout'>,</span> <span class='hs-varid'>ixValueN</span><span class='hs-layout'>,</span> <span class='hs-varid'>ixedN</span><span class='hs-layout'>,</span> <span class='hs-varid'>ixN</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span>
<a name="line-31"></a><span class='hs-definition'>indexN</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkName</span> <span class='hs-str'>"Index"</span>
<a name="line-32"></a><a name="ixValueN"></a><span class='hs-definition'>ixValueN</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkName</span> <span class='hs-str'>"IxValue"</span>
<a name="line-33"></a><a name="ixedN"></a><span class='hs-definition'>ixedN</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkName</span> <span class='hs-str'>"Ixed"</span>
<a name="line-34"></a><a name="ixN"></a><span class='hs-definition'>ixN</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkName</span> <span class='hs-str'>"ix"</span>
<a name="line-35"></a>
<a name="line-36"></a><span class='hs-comment'>-- While GHC supports tuples up to 62, it can't cope with the resulting</span>
<a name="line-37"></a><span class='hs-comment'>-- large definitions. 9-tuples should be enough for anyone.</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="makeAllTupleIxed"></a><span class='hs-comment'>-- This generates all of the Ixed instances for tuples up to 9.</span>
<a name="line-40"></a><span class='hs-definition'>makeAllTupleIxed</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DecsQ</span>
<a name="line-41"></a><span class='hs-definition'>makeAllTupleIxed</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>concat</span> <span class='hs-layout'>(</span><span class='hs-varid'>traverse</span> <span class='hs-varid'>makeTupleIxed</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>2</span><span class='hs-keyglyph'>..</span><span class='hs-num'>9</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="makeTupleIxed"></a><span class='hs-comment'>-- type instance Index (a,..) = Int</span>
<a name="line-44"></a><span class='hs-comment'>-- type instance IxValue (a,..) = a</span>
<a name="line-45"></a><span class='hs-comment'>-- instance (a~b,a~c...) => Ixed (a,b,c..) where</span>
<a name="line-46"></a><span class='hs-comment'>-- ix i f (a,b,c..) = fmap (\x -> (a,b,c...x..)) (f z)</span>
<a name="line-47"></a><span class='hs-comment'>-- ix _ f x = pure x</span>
<a name="line-48"></a><span class='hs-definition'>makeTupleIxed</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecsQ</span>
<a name="line-49"></a><span class='hs-definition'>makeTupleIxed</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sequence</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>tupleIndex</span> <span class='hs-varid'>n</span><span class='hs-layout'>,</span> <span class='hs-varid'>tupleIxValue</span> <span class='hs-varid'>n</span><span class='hs-layout'>,</span> <span class='hs-varid'>tupleIxed</span> <span class='hs-varid'>n</span><span class='hs-keyglyph'>]</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="tupleIndex"></a><span class='hs-comment'>-- type instance Index (a,..) = Int</span>
<a name="line-52"></a><span class='hs-definition'>tupleIndex</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecQ</span>
<a name="line-53"></a><span class='hs-definition'>tupleIndex</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tySynInstD'</span> <span class='hs-varid'>indexN</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>fullTupleT</span> <span class='hs-varid'>n</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>t</span><span class='hs-keyglyph'>|</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>|</span><span class='hs-keyglyph'>]</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="tupleIxValue"></a><span class='hs-comment'>-- type instance IxValue (a,..) = a</span>
<a name="line-56"></a><span class='hs-definition'>tupleIxValue</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecQ</span>
<a name="line-57"></a><span class='hs-definition'>tupleIxValue</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tySynInstD'</span> <span class='hs-varid'>ixValueN</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>fullTupleT</span> <span class='hs-varid'>n</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-varid'>head</span> <span class='hs-varid'>tupleVarTypes</span><span class='hs-layout'>)</span>
<a name="line-58"></a>
<a name="line-59"></a><a name="fullTupleT"></a><span class='hs-comment'>-- (a,..)</span>
<a name="line-60"></a><span class='hs-definition'>fullTupleT</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TypeQ</span>
<a name="line-61"></a><span class='hs-definition'>fullTupleT</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toTupleT</span> <span class='hs-layout'>(</span><span class='hs-varid'>take</span> <span class='hs-varid'>n</span> <span class='hs-varid'>tupleVarTypes</span><span class='hs-layout'>)</span>
<a name="line-62"></a>
<a name="line-63"></a><a name="tupleIxed"></a><span class='hs-comment'>-- instance (a~b,a~c...) => Ixed (a,b,c..) where</span>
<a name="line-64"></a><span class='hs-comment'>-- ix i f (a,b,c..) = fmap (\x -> (a,b,c...x..)) (f z)</span>
<a name="line-65"></a><span class='hs-comment'>-- ix _ f x = pure x</span>
<a name="line-66"></a><span class='hs-definition'>tupleIxed</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DecQ</span>
<a name="line-67"></a><span class='hs-definition'>tupleIxed</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>instanceD</span> <span class='hs-layout'>(</span><span class='hs-varid'>cxt</span> <span class='hs-varid'>eqs</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>conT</span> <span class='hs-varid'>ixedN</span> <span class='hs-varop'>`appT`</span> <span class='hs-varid'>fullTupleT</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>funD</span> <span class='hs-varid'>ixN</span> <span class='hs-varid'>clauses</span><span class='hs-keyglyph'>]</span>
<a name="line-68"></a> <span class='hs-keyword'>where</span>
<a name="line-69"></a> <span class='hs-varid'>ty0</span><span class='hs-conop'>:</span><span class='hs-varid'>tyN</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>take</span> <span class='hs-varid'>n</span> <span class='hs-varid'>tupleVarTypes</span>
<a name="line-70"></a><span class='hs-cpp'>#if MIN_VERSION_template_haskell(2,10,0)</span>
<a name="line-71"></a> <span class='hs-varid'>eqs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>AppT</span> <span class='hs-varop'>.</span> <span class='hs-conid'>AppT</span> <span class='hs-conid'>EqualityT</span> <span class='hs-varop'><$></span> <span class='hs-varid'>ty0</span> <span class='hs-varop'><*></span> <span class='hs-varid'>ty</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ty</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>tyN</span><span class='hs-keyglyph'>]</span>
<a name="line-72"></a><span class='hs-cpp'>#else</span>
<a name="line-73"></a> <span class='hs-varid'>eqs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>ty0</span> <span class='hs-varop'>`equalP`</span> <span class='hs-varid'>ty</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ty</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>tyN</span><span class='hs-keyglyph'>]</span>
<a name="line-74"></a><span class='hs-cpp'>#endif</span>
<a name="line-75"></a> <span class='hs-varid'>clauses</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>nClause</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>0</span><span class='hs-keyglyph'>..</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-keyglyph'>]</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>otherClause</span><span class='hs-keyglyph'>]</span>
<a name="line-76"></a>
<a name="line-77"></a> <span class='hs-comment'>-- ix i f (a,..) = fmap (\x->(a,..x..)) (f z)</span>
<a name="line-78"></a> <span class='hs-varid'>nClause</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-79"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>iP</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>litP</span> <span class='hs-layout'>(</span><span class='hs-varid'>integerL</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-80"></a> <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-81"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>fP</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>varP</span> <span class='hs-varid'>f</span>
<a name="line-82"></a> <span class='hs-varid'>fE</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>varE</span> <span class='hs-varid'>f</span>
<a name="line-83"></a> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>newName</span> <span class='hs-layout'>(</span><span class='hs-varid'>take</span> <span class='hs-varid'>n</span> <span class='hs-varid'>nameSource</span><span class='hs-layout'>)</span>
<a name="line-84"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>xsP</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>varP</span> <span class='hs-varid'>xs</span>
<a name="line-85"></a> <span class='hs-varid'>xsE</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>varE</span> <span class='hs-varid'>xs</span>
<a name="line-86"></a> <span class='hs-varid'>xE</span> <span class='hs-keyglyph'>=</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>
<a name="line-87"></a> <span class='hs-varid'>clause</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>iP</span><span class='hs-layout'>,</span> <span class='hs-varid'>fP</span><span class='hs-layout'>,</span> <span class='hs-varid'>toTupleP</span> <span class='hs-varid'>xsP</span><span class='hs-keyglyph'>]</span>
<a name="line-88"></a> <span class='hs-layout'>(</span><span class='hs-varid'>normalB</span> <span class='hs-keyglyph'>[</span><span class='hs-keyglyph'>|</span> <span class='hs-varid'>fmap</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-varop'>$</span><span class='hs-layout'>(</span><span class='hs-varid'>toTupleE</span> <span class='hs-layout'>(</span><span class='hs-varid'>replaceAt</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>[</span><span class='hs-keyglyph'>|</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>|</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>xsE</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varop'>$</span><span class='hs-varid'>fE</span> <span class='hs-varop'>$</span><span class='hs-varid'>xE</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-89"></a> <span class='hs-conid'>[]</span>
<a name="line-90"></a>
<a name="line-91"></a> <span class='hs-comment'>-- ix _ _ x = pure x</span>
<a name="line-92"></a> <span class='hs-varid'>otherClause</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-93"></a> <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-94"></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'>wildP</span><span class='hs-layout'>,</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-varid'>normalB</span> <span class='hs-keyglyph'>[</span><span class='hs-keyglyph'>|</span><span class='hs-varid'>pure</span> <span class='hs-varop'>$</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-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span>
<a name="line-95"></a>
<a name="line-96"></a><a name="tupleVarTypes"></a><span class='hs-definition'>tupleVarTypes</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>TypeQ</span><span class='hs-keyglyph'>]</span>
<a name="line-97"></a><span class='hs-definition'>tupleVarTypes</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>varT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>mkName</span><span class='hs-layout'>)</span> <span class='hs-varid'>nameSource</span>
<a name="line-98"></a>
<a name="line-99"></a><a name="nameSource"></a><span class='hs-comment'>-- [a,b,c,d...a1,b1,b2...a2,b2,c3...]</span>
<a name="line-100"></a><span class='hs-definition'>nameSource</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-101"></a><span class='hs-definition'>nameSource</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>a</span><span class='hs-conop'>:</span><span class='hs-varid'>n</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'><-</span> <span class='hs-str'>""</span> <span class='hs-conop'>:</span> <span class='hs-varid'>map</span> <span class='hs-varid'>show</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>1</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>..</span><span class='hs-keyglyph'>]</span>
<a name="line-102"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyglyph'>[</span><span class='hs-chr'>'a'</span><span class='hs-keyglyph'>..</span><span class='hs-chr'>'z'</span><span class='hs-keyglyph'>]</span>
<a name="line-103"></a> <span class='hs-keyglyph'>]</span>
<a name="line-104"></a>
<a name="line-105"></a><a name="replaceAt"></a><span class='hs-comment'>-- While this could be easily implemented as 'set . ix'</span>
<a name="line-106"></a><span class='hs-comment'>-- this local definition removes any circular dependency</span>
<a name="line-107"></a><span class='hs-comment'>-- issues.</span>
<a name="line-108"></a><span class='hs-definition'>replaceAt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</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> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-109"></a><span class='hs-definition'>replaceAt</span> <span class='hs-num'>0</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>ys</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>ys</span>
<a name="line-110"></a><span class='hs-definition'>replaceAt</span> <span class='hs-varid'>i</span> <span class='hs-varid'>x</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> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>y</span> <span class='hs-conop'>:</span> <span class='hs-varid'>replaceAt</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-varid'>ys</span>
<a name="line-111"></a><span class='hs-definition'>replaceAt</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-str'>"replaceAt: index too large"</span>
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