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<title>Control/Exception/IOChoice/THUtil.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE TemplateHaskell, CPP #-}</span>
<a name="line-2"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span><span class='hs-varop'>.</span><span class='hs-conid'>IOChoice</span><span class='hs-varop'>.</span><span class='hs-conid'>THUtil</span> <span class='hs-layout'>(</span><span class='hs-varid'>newChoice</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-3"></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-4"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-layout'>(</span><span class='hs-conid'>IOException</span><span class='hs-layout'>)</span>
<a name="line-5"></a>
<a name="line-6"></a><a name="newChoice"></a><span class='hs-definition'>newChoice</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ExpQ</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ExpQ</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'>ExpQ</span>
<a name="line-7"></a><span class='hs-definition'>newChoice</span> <span class='hs-varid'>catches</span> <span class='hs-varid'>handler</span> <span class='hs-varid'>typs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-8"></a> <span class='hs-varid'>ma</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newName</span> <span class='hs-str'>"ma"</span>
<a name="line-9"></a> <span class='hs-varid'>mb</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newName</span> <span class='hs-str'>"mb"</span>
<a name="line-10"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>hs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkHandler</span> <span class='hs-varid'>handler</span> <span class='hs-varid'>mb</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-conid'>IOException</span> <span class='hs-conop'>:</span> <span class='hs-varid'>typs</span><span class='hs-layout'>)</span>
<a name="line-11"></a> <span class='hs-varid'>lamE</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>varP</span> <span class='hs-varid'>ma</span><span class='hs-layout'>,</span> <span class='hs-varid'>varP</span> <span class='hs-varid'>mb</span><span class='hs-keyglyph'>]</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>[</span><span class='hs-keyglyph'>|</span> <span class='hs-varop'>$</span><span class='hs-varid'>catches</span> <span class='hs-varop'>$</span><span class='hs-layout'>(</span><span class='hs-varid'>varE</span> <span class='hs-varid'>ma</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span><span class='hs-layout'>(</span><span class='hs-varid'>listE</span> <span class='hs-varid'>hs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span><span class='hs-keyglyph'>]</span>
<a name="line-12"></a>
<a name="line-13"></a><a name="mkHandler"></a><span class='hs-definition'>mkHandler</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ExpQ</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'>ExpQ</span>
<a name="line-14"></a><span class='hs-definition'>mkHandler</span> <span class='hs-varid'>handler</span> <span class='hs-varid'>act</span> <span class='hs-varid'>eName</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-15"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>exc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>checkSupported</span> <span class='hs-varid'>eName</span>
<a name="line-16"></a> <span class='hs-keyglyph'>[</span><span class='hs-keyglyph'>|</span> <span class='hs-varop'>$</span><span class='hs-varid'>handler</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-sel'>_e</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>let</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-sel'>_e</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>$</span><span class='hs-varid'>exc</span> <span class='hs-keyword'>in</span> <span class='hs-varop'>$</span><span class='hs-layout'>(</span><span class='hs-varid'>varE</span> <span class='hs-varid'>act</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span><span class='hs-keyglyph'>]</span>
<a name="line-17"></a>
<a name="line-18"></a><a name="checkSupported"></a><span class='hs-definition'>checkSupported</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TypeQ</span>
<a name="line-19"></a><span class='hs-definition'>checkSupported</span> <span class='hs-varid'>exc</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-20"></a> <span class='hs-varid'>info</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>reify</span> <span class='hs-varid'>exc</span>
<a name="line-21"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>info</span> <span class='hs-keyword'>of</span>
<a name="line-22"></a> <span class='hs-conid'>TyConI</span> <span class='hs-varid'>dec</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-23"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>dec</span> <span class='hs-keyword'>of</span>
<a name="line-24"></a> <span class='hs-conid'>DataD</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>name</span> <span class='hs-conid'>[]</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>conT</span> <span class='hs-varid'>name</span>
<a name="line-25"></a> <span class='hs-conid'>NewtypeD</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>name</span> <span class='hs-conid'>[]</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>conT</span> <span class='hs-varid'>name</span>
<a name="line-26"></a> <span class='hs-conid'>TySynD</span> <span class='hs-varid'>name</span> <span class='hs-conid'>[]</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>conT</span> <span class='hs-varid'>name</span>
<a name="line-27"></a> <span class='hs-conid'>DataInstD</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>name</span> <span class='hs-varid'>args</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>foldl1</span> <span class='hs-varid'>appT</span> <span class='hs-layout'>(</span><span class='hs-varid'>conT</span> <span class='hs-varid'>name</span><span class='hs-conop'>:</span><span class='hs-varid'>map</span> <span class='hs-varid'>return</span> <span class='hs-varid'>args</span><span class='hs-layout'>)</span>
<a name="line-28"></a> <span class='hs-conid'>NewtypeInstD</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>name</span> <span class='hs-varid'>args</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>foldl1</span> <span class='hs-varid'>appT</span> <span class='hs-layout'>(</span><span class='hs-varid'>conT</span> <span class='hs-varid'>name</span><span class='hs-conop'>:</span><span class='hs-varid'>map</span> <span class='hs-varid'>return</span> <span class='hs-varid'>args</span><span class='hs-layout'>)</span>
<a name="line-29"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 707</span>
<a name="line-30"></a> <span class='hs-conid'>TySynInstD</span> <span class='hs-varid'>name</span> <span class='hs-layout'>(</span><span class='hs-conid'>TySynEqn</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>foldl1</span> <span class='hs-varid'>appT</span> <span class='hs-layout'>(</span><span class='hs-varid'>conT</span> <span class='hs-varid'>name</span><span class='hs-conop'>:</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>return</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-31"></a><span class='hs-cpp'>#else</span>
<a name="line-32"></a> <span class='hs-conid'>TySynInstD</span> <span class='hs-varid'>name</span> <span class='hs-varid'>args</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>foldl1</span> <span class='hs-varid'>appT</span> <span class='hs-layout'>(</span><span class='hs-varid'>conT</span> <span class='hs-varid'>name</span><span class='hs-conop'>:</span><span class='hs-varid'>map</span> <span class='hs-varid'>return</span> <span class='hs-varid'>args</span><span class='hs-layout'>)</span>
<a name="line-33"></a><span class='hs-cpp'>#endif</span>
<a name="line-34"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Exception type must not have any type argument: "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>exc</span>
<a name="line-35"></a> <span class='hs-conid'>PrimTyConI</span> <span class='hs-varid'>n</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>conT</span> <span class='hs-varid'>n</span>
<a name="line-36"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Type name required, but got: "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>exc</span>
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