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<title>src/Database/PostgreSQL/Simple/TypeInfo/Macro.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE TemplateHaskell #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-4"></a><span class='hs-comment'>-- |</span>
<a name="line-5"></a><span class='hs-comment'>-- Module: Database.PostgreSQL.Simple.TypeInfo.Macro</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright: (c) 2013 Leon P Smith</span>
<a name="line-7"></a><span class='hs-comment'>-- License: BSD3</span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer: Leon P Smith <leon@melding-monads.com></span>
<a name="line-9"></a><span class='hs-comment'>-- Stability: experimental</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- A Template Haskell macro for efficiently checking membership in</span>
<a name="line-12"></a><span class='hs-comment'>-- a set of type oids.</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-15"></a>
<a name="line-16"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Database</span><span class='hs-varop'>.</span><span class='hs-conid'>PostgreSQL</span><span class='hs-varop'>.</span><span class='hs-conid'>Simple</span><span class='hs-varop'>.</span><span class='hs-conid'>TypeInfo</span><span class='hs-varop'>.</span><span class='hs-conid'>Macro</span>
<a name="line-17"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>mkCompats</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>inlineTypoid</span>
<a name="line-19"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-20"></a>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Database</span><span class='hs-varop'>.</span><span class='hs-conid'>PostgreSQL</span><span class='hs-varop'>.</span><span class='hs-conid'>Simple</span><span class='hs-varop'>.</span><span class='hs-conid'>TypeInfo</span><span class='hs-varop'>.</span><span class='hs-conid'>Static</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Database</span><span class='hs-varop'>.</span><span class='hs-conid'>PostgreSQL</span><span class='hs-varop'>.</span><span class='hs-conid'>Simple</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span> <span class='hs-layout'>(</span><span class='hs-conid'>Oid</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-23"></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-24"></a>
<a name="line-25"></a>
<a name="line-26"></a><a name="mkCompats"></a><span class='hs-comment'>-- | Returns an expression that has type @'Oid' -> 'Bool'@, true if the</span>
<a name="line-27"></a><span class='hs-comment'>-- oid is equal to any one of the 'typoid's of the given 'TypeInfo's.</span>
<a name="line-28"></a><span class='hs-definition'>mkCompats</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>TypeInfo</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ExpQ</span>
<a name="line-29"></a><span class='hs-definition'>mkCompats</span> <span class='hs-varid'>tys</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-keyglyph'>|</span> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-conid'>Oid</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varop'>$</span><span class='hs-layout'>(</span><span class='hs-varid'>caseE</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-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>alt</span> <span class='hs-varid'>tys</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>catchAll</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-30"></a> <span class='hs-keyword'>where</span>
<a name="line-31"></a> <span class='hs-varid'>alt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TypeInfo</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MatchQ</span>
<a name="line-32"></a> <span class='hs-varid'>alt</span> <span class='hs-varid'>ty</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>match</span> <span class='hs-layout'>(</span><span class='hs-varid'>inlineTypoidP</span> <span class='hs-varid'>ty</span><span class='hs-layout'>)</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-conid'>True</span> <span class='hs-keyglyph'>|</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span>
<a name="line-33"></a>
<a name="line-34"></a> <span class='hs-varid'>catchAll</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MatchQ</span>
<a name="line-35"></a> <span class='hs-varid'>catchAll</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>match</span> <span class='hs-varid'>wildP</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-conid'>False</span> <span class='hs-keyglyph'>|</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span>
<a name="line-36"></a>
<a name="line-37"></a><a name="inlineTypoid"></a><span class='hs-comment'>-- | Literally substitute the 'typoid' of a 'TypeInfo' expression.</span>
<a name="line-38"></a><span class='hs-comment'>-- Returns an expression of type 'Oid'. Useful because GHC tends</span>
<a name="line-39"></a><span class='hs-comment'>-- not to fold constants.</span>
<a name="line-40"></a><span class='hs-definition'>inlineTypoid</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TypeInfo</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ExpQ</span>
<a name="line-41"></a><span class='hs-definition'>inlineTypoid</span> <span class='hs-varid'>ty</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-keyglyph'>|</span> <span class='hs-conid'>Oid</span> <span class='hs-varop'>$</span><span class='hs-layout'>(</span><span class='hs-varid'>litE</span> <span class='hs-layout'>(</span><span class='hs-varid'>getTypoid</span> <span class='hs-varid'>ty</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span><span class='hs-keyglyph'>]</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="inlineTypoidP"></a><span class='hs-definition'>inlineTypoidP</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TypeInfo</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PatQ</span>
<a name="line-44"></a><span class='hs-definition'>inlineTypoidP</span> <span class='hs-varid'>ty</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>litP</span> <span class='hs-layout'>(</span><span class='hs-varid'>getTypoid</span> <span class='hs-varid'>ty</span><span class='hs-layout'>)</span>
<a name="line-45"></a>
<a name="line-46"></a><a name="getTypoid"></a><span class='hs-definition'>getTypoid</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TypeInfo</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Lit</span>
<a name="line-47"></a><span class='hs-definition'>getTypoid</span> <span class='hs-varid'>ty</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-conid'>Oid</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>typoid</span> <span class='hs-varid'>ty</span> <span class='hs-keyword'>in</span> <span class='hs-varid'>integerL</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
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