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<title>src/Language/Haskell/TH/FlexibleDefaults.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-- |A code-generation system for complex typeclass default-implementation</span>
<a name="line-2"></a><span class='hs-comment'>-- configurations. There are usage examples in this package's source </span>
<a name="line-3"></a><span class='hs-comment'>-- distribution[1] and in the random-source package[2].</span>
<a name="line-4"></a><span class='hs-comment'>-- </span>
<a name="line-5"></a><span class='hs-comment'>-- 1. <https://github.com/mokus0/flexible-defaults/tree/master/examples></span>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-comment'>-- 2. <https://github.com/mokus0/random-fu/blob/master/random-source/src/Data/Random/Internal/TH.hs></span>
<a name="line-8"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-9"></a><span class='hs-keyword'>module</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><span class='hs-varop'>.</span><span class='hs-conid'>FlexibleDefaults</span>
<a name="line-10"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>Defaults</span>
<a name="line-11"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>scoreBy</span>
<a name="line-12"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Function</span>
<a name="line-13"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>function</span>
<a name="line-14"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>requireFunction</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Implementation</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>implementation</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>score</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>cost</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>dependsOn</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>inline</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>noinline</span>
<a name="line-22"></a>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>withDefaults</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>implementDefaults</span>
<a name="line-25"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-26"></a>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Ord</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>M</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Set</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>S</span>
<a name="line-32"></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-33"></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><span class='hs-varop'>.</span><span class='hs-conid'>Extras</span>
<a name="line-34"></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><span class='hs-varop'>.</span><span class='hs-conid'>FlexibleDefaults</span><span class='hs-varop'>.</span><span class='hs-conid'>DSL</span>
<a name="line-35"></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><span class='hs-varop'>.</span><span class='hs-conid'>FlexibleDefaults</span><span class='hs-varop'>.</span><span class='hs-conid'>Solve</span>
<a name="line-36"></a>
<a name="line-37"></a><a name="deleteKeys"></a><span class='hs-definition'>deleteKeys</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-conid'>Set</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-varid'>k</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-varid'>k</span> <span class='hs-varid'>v</span>
<a name="line-38"></a><span class='hs-definition'>deleteKeys</span> <span class='hs-varid'>ks</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>m</span> <span class='hs-conid'>M</span><span class='hs-varop'>.\\</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-varid'>fromDistinctAscList</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>k</span><span class='hs-layout'>,</span><span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>toAscList</span> <span class='hs-varid'>ks</span><span class='hs-keyglyph'>]</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="implementDefaults"></a><span class='hs-comment'>-- |Given a partial list of function declarations, complete that list based on</span>
<a name="line-41"></a><span class='hs-comment'>-- the 'Defaults' specification given.</span>
<a name="line-42"></a><span class='hs-definition'>implementDefaults</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ord</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Defaults</span> <span class='hs-varid'>s</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Dec</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Q</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Dec</span><span class='hs-keyglyph'>]</span>
<a name="line-43"></a><span class='hs-definition'>implementDefaults</span> <span class='hs-varid'>defs</span> <span class='hs-varid'>futzedDecs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-44"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>decs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>genericalizeDecs</span> <span class='hs-varid'>futzedDecs</span>
<a name="line-45"></a> <span class='hs-varid'>prob</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toProblem</span> <span class='hs-varid'>defs</span>
<a name="line-46"></a>
<a name="line-47"></a> <span class='hs-varid'>implemented</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>nameBase</span> <span class='hs-layout'>(</span><span class='hs-varid'>concatMap</span> <span class='hs-varid'>namesBoundInDec</span> <span class='hs-varid'>decs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-48"></a> <span class='hs-varid'>unimplemented</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>deleteKeys</span> <span class='hs-varid'>implemented</span> <span class='hs-varid'>prob</span>
<a name="line-49"></a>
<a name="line-50"></a> <span class='hs-varid'>solutions</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>chooseImplementations</span> <span class='hs-varid'>unimplemented</span>
<a name="line-51"></a>
<a name="line-52"></a> <span class='hs-varid'>implementations</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>solutions</span> <span class='hs-keyword'>of</span>
<a name="line-53"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"implementDefaults: incomplete set of basis functions"</span>
<a name="line-54"></a> <span class='hs-varid'>ss</span> <span class='hs-keyglyph'>-></span>
<a name="line-55"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>best</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maximumBy</span> <span class='hs-layout'>(</span><span class='hs-varid'>comparing</span> <span class='hs-varid'>scoreSolution</span><span class='hs-layout'>)</span> <span class='hs-varid'>ss</span>
<a name="line-56"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>sequence</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>decQ</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>ImplSpec</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>decQ</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-varid'>elems</span> <span class='hs-varid'>best</span><span class='hs-keyglyph'>]</span>
<a name="line-57"></a>
<a name="line-58"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>decs</span> <span class='hs-varop'>++</span> <span class='hs-varid'>concat</span> <span class='hs-varid'>implementations</span><span class='hs-layout'>)</span>
<a name="line-59"></a>
<a name="line-60"></a><span class='hs-comment'>-- TODO: maybe make this accept multiple instance declarations, and/or pass non-instance Dec's unmodified.</span>
<a name="line-61"></a><span class='hs-comment'>-- Or even accept something like "M.Map String (exists s. Defaults s)" to support</span>
<a name="line-62"></a><span class='hs-comment'>-- many different instance decls, choosing the 'Defaults' spec by class name.</span>
<a name="line-63"></a>
<a name="line-64"></a><a name="withDefaults"></a><span class='hs-comment'>-- |Given a @Q [Dec]@ containing an instance declaration, complete that instance</span>
<a name="line-65"></a><span class='hs-comment'>-- declaration using the given 'Defaults' specification. Typical usage would be</span>
<a name="line-66"></a><span class='hs-comment'>-- along the lines of the following:</span>
<a name="line-67"></a><span class='hs-comment'>--</span>
<a name="line-68"></a><span class='hs-comment'>-- > $(withDefaults fooDefaults [d| instance Foo t where {- ... -} |])</span>
<a name="line-69"></a><span class='hs-definition'>withDefaults</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Defaults</span> <span class='hs-varid'>s</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Q</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Dec</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Q</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Dec</span><span class='hs-keyglyph'>]</span>
<a name="line-70"></a><span class='hs-definition'>withDefaults</span> <span class='hs-varid'>defs</span> <span class='hs-varid'>decQ</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-71"></a> <span class='hs-varid'>dec</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>decQ</span>
<a name="line-72"></a>
<a name="line-73"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>dec</span> <span class='hs-keyword'>of</span>
<a name="line-74"></a><span class='hs-cpp'>#if MIN_VERSION_template_haskell(2,11,0)</span>
<a name="line-75"></a> <span class='hs-keyglyph'>[</span><span class='hs-conid'>InstanceD</span> <span class='hs-varid'>ol</span> <span class='hs-varid'>clsCxt</span> <span class='hs-varid'>cls</span> <span class='hs-varid'>decs</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-76"></a> <span class='hs-varid'>impl</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>implementDefaults</span> <span class='hs-varid'>defs</span> <span class='hs-varid'>decs</span>
<a name="line-77"></a> <span class='hs-varid'>return</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>InstanceD</span> <span class='hs-varid'>ol</span> <span class='hs-varid'>clsCxt</span> <span class='hs-varid'>cls</span> <span class='hs-varid'>impl</span><span class='hs-keyglyph'>]</span>
<a name="line-78"></a><span class='hs-cpp'>#else</span>
<a name="line-79"></a> <span class='hs-keyglyph'>[</span><span class='hs-conid'>InstanceD</span> <span class='hs-varid'>clsCxt</span> <span class='hs-varid'>cls</span> <span class='hs-varid'>decs</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-80"></a> <span class='hs-varid'>impl</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>implementDefaults</span> <span class='hs-varid'>defs</span> <span class='hs-varid'>decs</span>
<a name="line-81"></a> <span class='hs-varid'>return</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>InstanceD</span> <span class='hs-varid'>clsCxt</span> <span class='hs-varid'>cls</span> <span class='hs-varid'>impl</span><span class='hs-keyglyph'>]</span>
<a name="line-82"></a><span class='hs-cpp'>#endif</span>
<a name="line-83"></a>
<a name="line-84"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"withDefaults: second parameter should be a single instance declaration"</span>
<a name="line-85"></a>
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