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ghc-ForSyDe-devel-3.1.1-4.fc14.i686.rpm

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<pre><a name="line-1"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module      :  ForSyDe.Backend.VHDL.Quartus</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright   :  (c) SAM Group, KTH/ICT/ECS 2007-2008</span>
<a name="line-5"></a><span class='hs-comment'>-- License     :  BSD-style (see the file LICENSE)</span>
<a name="line-6"></a><span class='hs-comment'>-- </span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer  :  forsyde-dev@ict.kth.se</span>
<a name="line-8"></a><span class='hs-comment'>-- Stability   :  experimental</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability :  portable</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- Functions to process the VHDL compilation results with Altera's Quartus II</span>
<a name="line-12"></a><span class='hs-comment'>-- software.</span>
<a name="line-13"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-14"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>ForSyDe</span><span class='hs-varop'>.</span><span class='hs-conid'>Backend</span><span class='hs-varop'>.</span><span class='hs-conid'>VHDL</span><span class='hs-varop'>.</span><span class='hs-conid'>Quartus</span> 
<a name="line-15"></a> <span class='hs-layout'>(</span><span class='hs-varid'>callQuartus</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-16"></a>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>ForSyDe</span><span class='hs-varop'>.</span><span class='hs-conid'>ForSyDeErr</span>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>ForSyDe</span><span class='hs-varop'>.</span><span class='hs-conid'>Config</span> <span class='hs-layout'>(</span><span class='hs-varid'>getDataDir</span><span class='hs-layout'>)</span>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>ForSyDe</span><span class='hs-varop'>.</span><span class='hs-conid'>OSharing</span> <span class='hs-layout'>(</span><span class='hs-varid'>readURef</span><span class='hs-layout'>)</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>ForSyDe</span><span class='hs-varop'>.</span><span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>SysDef</span> <span class='hs-layout'>(</span><span class='hs-varid'>subSys</span><span class='hs-layout'>,</span><span class='hs-varid'>sid</span><span class='hs-layout'>,</span><span class='hs-varid'>unPrimSysDef</span><span class='hs-layout'>)</span>
<a name="line-21"></a>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>ForSyDe</span><span class='hs-varop'>.</span><span class='hs-conid'>Backend</span><span class='hs-varop'>.</span><span class='hs-conid'>VHDL</span><span class='hs-varop'>.</span><span class='hs-conid'>Traverse</span><span class='hs-varop'>.</span><span class='hs-conid'>VHDLM</span> 
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Directory</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Process</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'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Exit</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExitCode</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-29"></a>
<a name="line-30"></a>
<a name="line-31"></a>
<a name="line-32"></a><a name="callQuartus"></a><span class='hs-comment'>-- | Analyze the results with Quartus</span>
<a name="line-33"></a><span class='hs-comment'>--   (Note: the initial and final CWD will be /systemName/vhdl )</span>
<a name="line-34"></a><span class='hs-definition'>callQuartus</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>VHDLM</span> <span class='hs-conid'>()</span>
<a name="line-35"></a><span class='hs-definition'>callQuartus</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-36"></a> <span class='hs-varid'>mQuartus</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>gets</span> <span class='hs-layout'>(</span><span class='hs-varid'>execQuartus</span><span class='hs-varop'>.</span><span class='hs-varid'>ops</span><span class='hs-varop'>.</span><span class='hs-varid'>global</span><span class='hs-layout'>)</span>
<a name="line-37"></a> <span class='hs-comment'>-- is it necessary to call quartus?</span>
<a name="line-38"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>mQuartus</span> <span class='hs-keyword'>of</span>
<a name="line-39"></a>  <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-40"></a>  <span class='hs-comment'>-- Yes, we create the tcl script and call quartus_sh checking if it</span>
<a name="line-41"></a>  <span class='hs-comment'>-- exists in the system</span>
<a name="line-42"></a>  <span class='hs-conid'>Just</span> <span class='hs-varid'>ops</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span>
<a name="line-43"></a>    <span class='hs-varid'>mPath</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>findExecutable</span> <span class='hs-str'>"quartus_sh"</span>
<a name="line-44"></a>    <span class='hs-keyword'>case</span> <span class='hs-varid'>mPath</span> <span class='hs-keyword'>of</span>
<a name="line-45"></a>     <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>hPutStrLn</span> <span class='hs-varid'>stderr</span> <span class='hs-str'>"Error: quartus_sh not found"</span>
<a name="line-46"></a>                   <span class='hs-varid'>throwFError</span> <span class='hs-conid'>QuartusFailed</span>
<a name="line-47"></a>     <span class='hs-conid'>Just</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>contents</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>gen_quartus_tcl</span> <span class='hs-varid'>ops</span>
<a name="line-48"></a>                  <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>writeFile</span> <span class='hs-str'>"quartus.tcl"</span> <span class='hs-varid'>contents</span>
<a name="line-49"></a>                  <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>putStrLn</span> <span class='hs-str'>"Running quartus_sh -t quartus.tcl"</span>
<a name="line-50"></a>                  <span class='hs-varid'>code</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>waitForProcess</span> <span class='hs-varop'>=&lt;&lt;</span> <span class='hs-varid'>runCommand</span> 
<a name="line-51"></a>                                              <span class='hs-str'>"quartus_sh -t quartus.tcl"</span> 
<a name="line-52"></a>                  <span class='hs-keyword'>case</span> <span class='hs-varid'>code</span> <span class='hs-keyword'>of</span>
<a name="line-53"></a>                      <span class='hs-conid'>ExitFailure</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>throwFError</span> <span class='hs-conid'>QuartusFailed</span>
<a name="line-54"></a>                      <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-55"></a>  
<a name="line-56"></a><a name="gen_quartus_tcl"></a><span class='hs-comment'>-- | Generate the content of quartus.tcl</span>
<a name="line-57"></a><span class='hs-comment'>--   Note that, even in windows, the tcl interpreter requires pathnames</span>
<a name="line-58"></a><span class='hs-comment'>--   to use \"/\" instead of \"\\\"</span>
<a name="line-59"></a><span class='hs-definition'>gen_quartus_tcl</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>QuartusOps</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>VHDLM</span> <span class='hs-conid'>String</span>
<a name="line-60"></a><span class='hs-definition'>gen_quartus_tcl</span> <span class='hs-layout'>(</span><span class='hs-conid'>QuartusOps</span> <span class='hs-varid'>act</span> <span class='hs-varid'>mFMax</span> <span class='hs-varid'>mFamDev</span> <span class='hs-varid'>assigs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-61"></a> <span class='hs-varid'>sysName</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>gets</span> <span class='hs-layout'>(</span><span class='hs-varid'>sid</span><span class='hs-varop'>.</span><span class='hs-varid'>globalSysDef</span><span class='hs-varop'>.</span><span class='hs-varid'>global</span><span class='hs-layout'>)</span>
<a name="line-62"></a> <span class='hs-varid'>dataPath</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>getDataDir</span>
<a name="line-63"></a> <span class='hs-varid'>recursive</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>isRecursiveSet</span>
<a name="line-64"></a> <span class='hs-varid'>subs</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>gets</span> <span class='hs-layout'>(</span><span class='hs-varid'>subSys</span><span class='hs-varop'>.</span><span class='hs-varid'>globalSysDef</span><span class='hs-varop'>.</span><span class='hs-varid'>global</span><span class='hs-layout'>)</span>
<a name="line-65"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>libDir</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>changeSlashes</span> <span class='hs-varid'>dataPath</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span>  <span class='hs-str'>"/lib"</span>
<a name="line-66"></a>     <span class='hs-varid'>sysLib</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sysName</span> <span class='hs-varop'>++</span> <span class='hs-str'>"_lib"</span>
<a name="line-67"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unlines</span> <span class='hs-layout'>(</span>
<a name="line-68"></a>   <span class='hs-varid'>packages</span> <span class='hs-varop'>++</span>
<a name="line-69"></a>   <span class='hs-keyglyph'>[</span><span class='hs-varid'>projectNew</span>    <span class='hs-varid'>sysName</span><span class='hs-keyglyph'>]</span> <span class='hs-varop'>++</span> 
<a name="line-70"></a>   <span class='hs-varid'>mDefault</span> <span class='hs-varid'>mFMax</span> <span class='hs-varid'>fmax</span> <span class='hs-varop'>++</span>
<a name="line-71"></a>   <span class='hs-varid'>mDefault</span> <span class='hs-varid'>mFamDev</span> <span class='hs-varid'>famDev</span> <span class='hs-varop'>++</span>
<a name="line-72"></a>   <span class='hs-varid'>map</span> <span class='hs-varid'>mkAssig</span> <span class='hs-varid'>assigs</span> <span class='hs-varop'>++</span>
<a name="line-73"></a>   <span class='hs-keyglyph'>[</span><span class='hs-varid'>topLevelEntity</span> <span class='hs-varid'>sysName</span><span class='hs-layout'>,</span>
<a name="line-74"></a>   <span class='hs-varid'>includeVHDLFile</span> <span class='hs-layout'>(</span><span class='hs-str'>"work/"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>sysName</span> <span class='hs-varop'>++</span> <span class='hs-str'>".vhd"</span><span class='hs-layout'>)</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>,</span>
<a name="line-75"></a>   <span class='hs-varid'>includeVHDLFile</span> <span class='hs-layout'>(</span><span class='hs-chr'>'"'</span> <span class='hs-conop'>:</span> <span class='hs-layout'>(</span><span class='hs-varid'>libDir</span> <span class='hs-varop'>++</span> <span class='hs-str'>"/forsyde.vhd"</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-str'>"\""</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-str'>"forsyde"</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-76"></a>   <span class='hs-varid'>includeVHDLFile</span> <span class='hs-layout'>(</span><span class='hs-varid'>sysLib</span> <span class='hs-varop'>++</span> <span class='hs-str'>"/"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>sysLib</span> <span class='hs-varop'>++</span> <span class='hs-str'>".vhd"</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>sysLib</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-varop'>++</span>
<a name="line-77"></a>   <span class='hs-layout'>(</span><span class='hs-keyword'>if</span> <span class='hs-varid'>recursive</span> <span class='hs-keyword'>then</span>
<a name="line-78"></a>     <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>includeVHDLFile</span> 
<a name="line-79"></a>               <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-str'>"work/"</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span><span class='hs-varop'>.</span><span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-str'>".vhd"</span><span class='hs-layout'>)</span><span class='hs-varop'>.</span><span class='hs-varid'>sid</span><span class='hs-varop'>.</span><span class='hs-varid'>readURef</span><span class='hs-varop'>.</span><span class='hs-varid'>unPrimSysDef</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-80"></a>               <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span> <span class='hs-varid'>subs</span>
<a name="line-81"></a>     <span class='hs-keyword'>else</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span>
<a name="line-82"></a>   <span class='hs-keyglyph'>[</span><span class='hs-varid'>actionCmd</span>  <span class='hs-varid'>act</span><span class='hs-keyglyph'>]</span>
<a name="line-83"></a>  <span class='hs-layout'>)</span>
<a name="line-84"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>mDefault</span> <span class='hs-varid'>m</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span>
<a name="line-85"></a>       <span class='hs-varid'>actionCmd</span> <span class='hs-varid'>act</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>act</span> <span class='hs-keyword'>of</span>
<a name="line-86"></a>                        <span class='hs-conid'>AnalysisAndElaboration</span> <span class='hs-keyglyph'>-&gt;</span> 
<a name="line-87"></a>                           <span class='hs-str'>"execute_flow -analysis_and_elaboration"</span>
<a name="line-88"></a>                        <span class='hs-conid'>AnalysisAndSynthesis</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-89"></a>                           <span class='hs-str'>"execute_module -tool map"</span>
<a name="line-90"></a>                        <span class='hs-conid'>FullCompilation</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-91"></a>                           <span class='hs-str'>"execute_flow -compile"</span>
<a name="line-92"></a>       <span class='hs-varid'>fmax</span> <span class='hs-varid'>max</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-str'>"set_global_assignment -name FMAX_REQUIREMENT \""</span> <span class='hs-varop'>++</span> 
<a name="line-93"></a>                    <span class='hs-varid'>show</span> <span class='hs-varid'>max</span> <span class='hs-varop'>++</span> <span class='hs-str'>" MHz\""</span><span class='hs-keyglyph'>]</span>
<a name="line-94"></a>       <span class='hs-varid'>famDev</span> <span class='hs-layout'>(</span><span class='hs-varid'>fam</span><span class='hs-layout'>,</span> <span class='hs-varid'>mDev</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> 
<a name="line-95"></a>         <span class='hs-keyglyph'>[</span><span class='hs-str'>"set_global_assignment -name FAMILY "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>fam</span><span class='hs-keyglyph'>]</span> <span class='hs-varop'>++</span>
<a name="line-96"></a>         <span class='hs-keyword'>case</span> <span class='hs-varid'>mDev</span> <span class='hs-keyword'>of</span>
<a name="line-97"></a>           <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>[]</span>
<a name="line-98"></a>           <span class='hs-conid'>Just</span> <span class='hs-varid'>dev</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyglyph'>[</span><span class='hs-str'>"set_global_assignment -name DEVICE "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>dev</span><span class='hs-keyglyph'>]</span>
<a name="line-99"></a>       <span class='hs-varid'>mkAssig</span> <span class='hs-layout'>(</span><span class='hs-varid'>vhdlPin</span><span class='hs-layout'>,</span> <span class='hs-varid'>fpgaPin</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"set_location_assignment "</span> <span class='hs-varop'>++</span> 
<a name="line-100"></a>                                      <span class='hs-varid'>fpgaPin</span>  <span class='hs-varop'>++</span> <span class='hs-str'>" -to "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>vhdlPin</span>
<a name="line-101"></a>       <span class='hs-varid'>packages</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-str'>"load_package project"</span><span class='hs-layout'>,</span> <span class='hs-str'>"load_package flow"</span><span class='hs-keyglyph'>]</span>
<a name="line-102"></a>       <span class='hs-varid'>includeVHDLFile</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FilePath</span>      <span class='hs-comment'>-- ^ system name</span>
<a name="line-103"></a>                       <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>String</span>  <span class='hs-comment'>-- ^ what library to include the </span>
<a name="line-104"></a>                                        <span class='hs-comment'>-- file in</span>
<a name="line-105"></a>                       <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span>
<a name="line-106"></a>       <span class='hs-varid'>includeVHDLFile</span> <span class='hs-varid'>file</span> <span class='hs-varid'>mLib</span> <span class='hs-keyglyph'>=</span> 
<a name="line-107"></a>            <span class='hs-str'>"set_global_assignment -name VHDL_FILE "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>file</span> <span class='hs-varop'>++</span>
<a name="line-108"></a>            <span class='hs-varid'>maybe</span> <span class='hs-str'>""</span> <span class='hs-layout'>(</span><span class='hs-str'>" -library "</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>  <span class='hs-varid'>mLib</span>
<a name="line-109"></a>       <span class='hs-varid'>topLevelEntity</span> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> 
<a name="line-110"></a>         <span class='hs-str'>"set_global_assignment -name TOP_LEVEL_ENTITY "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>name</span>
<a name="line-111"></a>       <span class='hs-varid'>projectNew</span> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"project_new "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>name</span> <span class='hs-varop'>++</span> <span class='hs-str'>" -overwrite"</span>   
<a name="line-112"></a>       <span class='hs-varid'>changeSlashes</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-113"></a>       <span class='hs-varid'>changeSlashes</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\\'</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-chr'>'/'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>changeSlashes</span> <span class='hs-varid'>xs</span>
<a name="line-114"></a>       <span class='hs-varid'>changeSlashes</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'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>changeSlashes</span> <span class='hs-varid'>xs</span>         
<a name="line-115"></a> 
</pre></body>
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