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<title>System/Console/CmdArgs/Explicit/Process.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE RecordWildCards #-}</span>
<a name="line-2"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Console</span><span class='hs-varop'>.</span><span class='hs-conid'>CmdArgs</span><span class='hs-varop'>.</span><span class='hs-conid'>Explicit</span><span class='hs-varop'>.</span><span class='hs-conid'>Process</span><span class='hs-layout'>(</span><span class='hs-varid'>process</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-3"></a>
<a name="line-4"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Console</span><span class='hs-varop'>.</span><span class='hs-conid'>CmdArgs</span><span class='hs-varop'>.</span><span class='hs-conid'>Explicit</span><span class='hs-varop'>.</span><span class='hs-conid'>Type</span>
<a name="line-5"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Arrow</span>
<a name="line-6"></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-7"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span>
<a name="line-8"></a>
<a name="line-9"></a>
<a name="line-10"></a><a name="process"></a><span class='hs-comment'>-- | Process a list of flags (usually obtained from @getArgs@/@expandArgsAt@) with a mode. Returns</span>
<a name="line-11"></a><span class='hs-comment'>-- @Left@ and an error message if the command line fails to parse, or @Right@ and</span>
<a name="line-12"></a><span class='hs-comment'>-- the associated value.</span>
<a name="line-13"></a><span class='hs-definition'>process</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Mode</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-varid'>a</span>
<a name="line-14"></a><span class='hs-definition'>process</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>processMode</span>
<a name="line-15"></a>
<a name="line-16"></a>
<a name="line-17"></a><a name="processMode"></a><span class='hs-definition'>processMode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Mode</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-varid'>a</span>
<a name="line-18"></a><span class='hs-definition'>processMode</span> <span class='hs-varid'>m</span> <span class='hs-varid'>args</span> <span class='hs-keyglyph'>=</span>
<a name="line-19"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>find</span> <span class='hs-keyword'>of</span>
<a name="line-20"></a> <span class='hs-conid'>Ambiguous</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Left</span> <span class='hs-varop'>$</span> <span class='hs-varid'>ambiguous</span> <span class='hs-str'>"mode"</span> <span class='hs-varid'>a</span> <span class='hs-varid'>xs</span>
<a name="line-21"></a> <span class='hs-conid'>Found</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>processMode</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>as</span>
<a name="line-22"></a> <span class='hs-conid'>NotFound</span>
<a name="line-23"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-layout'>(</span><span class='hs-varid'>fst</span> <span class='hs-varop'>$</span> <span class='hs-varid'>modeArgs</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>isNothing</span> <span class='hs-layout'>(</span><span class='hs-varid'>snd</span> <span class='hs-varop'>$</span> <span class='hs-varid'>modeArgs</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>args</span> <span class='hs-varop'>/=</span> <span class='hs-conid'>[]</span> <span class='hs-varop'>&&</span>
<a name="line-24"></a> <span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-varid'>null</span> <span class='hs-varop'>$</span> <span class='hs-varid'>modeModes</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-str'>"-"</span> <span class='hs-varop'>`isPrefixOf`</span> <span class='hs-varid'>concat</span> <span class='hs-varid'>args</span><span class='hs-layout'>)</span>
<a name="line-25"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Left</span> <span class='hs-varop'>$</span> <span class='hs-varid'>missing</span> <span class='hs-str'>"mode"</span> <span class='hs-varop'>$</span> <span class='hs-varid'>concatMap</span> <span class='hs-varid'>modeNames</span> <span class='hs-varop'>$</span> <span class='hs-varid'>modeModes</span> <span class='hs-varid'>m</span>
<a name="line-26"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>either</span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-varid'>modeCheck</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>processFlags</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>modeValue</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>args</span>
<a name="line-27"></a> <span class='hs-keyword'>where</span>
<a name="line-28"></a> <span class='hs-layout'>(</span><span class='hs-varid'>find</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-keyword'>as</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>args</span> <span class='hs-keyword'>of</span>
<a name="line-29"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>NotFound</span><span class='hs-layout'>,</span><span class='hs-str'>""</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-30"></a> <span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>lookupName</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>modeNames</span> <span class='hs-varop'>&&&</span> <span class='hs-varid'>id</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>modeModes</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-31"></a>
<a name="line-32"></a>
<a name="line-33"></a><a name="S"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>S</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span>
<a name="line-34"></a> <span class='hs-layout'>{</span><span class='hs-varid'>val</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- The value you are accumulating</span>
<a name="line-35"></a> <span class='hs-layout'>,</span><span class='hs-varid'>args</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- The arguments you are processing through</span>
<a name="line-36"></a> <span class='hs-layout'>,</span><span class='hs-varid'>argsCount</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- The number of unnamed arguments you have seen</span>
<a name="line-37"></a> <span class='hs-layout'>,</span><span class='hs-varid'>errs</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- The errors you have seen</span>
<a name="line-38"></a> <span class='hs-layout'>}</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="stop"></a><span class='hs-definition'>stop</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Mode</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>S</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-41"></a><span class='hs-definition'>stop</span> <span class='hs-varid'>mode</span> <span class='hs-conid'>S</span><span class='hs-layout'>{</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>}</span>
<a name="line-42"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>not</span> <span class='hs-varop'>$</span> <span class='hs-varid'>null</span> <span class='hs-varid'>errs</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Left</span> <span class='hs-varop'>$</span> <span class='hs-varid'>last</span> <span class='hs-varid'>errs</span>
<a name="line-43"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>args</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>argsCount</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>mn</span> <span class='hs-keyword'>then</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>val</span> <span class='hs-keyword'>else</span>
<a name="line-44"></a> <span class='hs-conid'>Left</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Expected "</span> <span class='hs-varop'>++</span> <span class='hs-layout'>(</span><span class='hs-keyword'>if</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>mn</span> <span class='hs-varop'>==</span> <span class='hs-varid'>mx</span> <span class='hs-keyword'>then</span> <span class='hs-str'>"exactly"</span> <span class='hs-keyword'>else</span> <span class='hs-str'>"at least"</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>mn</span> <span class='hs-varop'>++</span> <span class='hs-str'>" unnamed arguments, but got only "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>argsCount</span>
<a name="line-45"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-46"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>mn</span><span class='hs-layout'>,</span> <span class='hs-varid'>mx</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>argsRange</span> <span class='hs-varid'>mode</span>
<a name="line-47"></a>
<a name="line-48"></a><a name="err"></a><span class='hs-definition'>err</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>S</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>S</span> <span class='hs-varid'>a</span>
<a name="line-49"></a><span class='hs-definition'>err</span> <span class='hs-varid'>s</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s</span><span class='hs-layout'>{</span><span class='hs-varid'>errs</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>errs</span> <span class='hs-varid'>s</span><span class='hs-layout'>}</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="upd"></a><span class='hs-definition'>upd</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>S</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>S</span> <span class='hs-varid'>a</span>
<a name="line-52"></a><span class='hs-definition'>upd</span> <span class='hs-varid'>s</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-varid'>val</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-53"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>err</span> <span class='hs-varid'>s</span> <span class='hs-varid'>x</span>
<a name="line-54"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span><span class='hs-layout'>{</span><span class='hs-varid'>val</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>x</span><span class='hs-layout'>}</span>
<a name="line-55"></a>
<a name="line-56"></a>
<a name="line-57"></a><a name="processFlags"></a><span class='hs-definition'>processFlags</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Mode</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-varid'>a</span>
<a name="line-58"></a><span class='hs-definition'>processFlags</span> <span class='hs-varid'>mode</span> <span class='hs-varid'>val_</span> <span class='hs-varid'>args_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-conid'>S</span> <span class='hs-varid'>val_</span> <span class='hs-varid'>args_</span> <span class='hs-num'>0</span> <span class='hs-conid'>[]</span>
<a name="line-59"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-varid'>processFlag</span> <span class='hs-varid'>mode</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>stop</span> <span class='hs-varid'>mode</span> <span class='hs-varid'>s</span>
<a name="line-60"></a>
<a name="line-61"></a>
<a name="line-62"></a><a name="pickFlags"></a><span class='hs-definition'>pickFlags</span> <span class='hs-varid'>long</span> <span class='hs-varid'>mode</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>filter</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-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-varid'>x</span> <span class='hs-varop'>></span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>==</span> <span class='hs-varid'>long</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flagNames</span> <span class='hs-varid'>flag</span><span class='hs-layout'>,</span><span class='hs-layout'>(</span><span class='hs-varid'>flagInfo</span> <span class='hs-varid'>flag</span><span class='hs-layout'>,</span><span class='hs-varid'>flag</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>flag</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>modeFlags</span> <span class='hs-varid'>mode</span><span class='hs-keyglyph'>]</span>
<a name="line-63"></a>
<a name="line-64"></a>
<a name="line-65"></a><a name="processFlag"></a><span class='hs-definition'>processFlag</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Mode</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>S</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>S</span> <span class='hs-varid'>a</span>
<a name="line-66"></a><span class='hs-definition'>processFlag</span> <span class='hs-varid'>mode</span> <span class='hs-varid'>s_</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>S</span><span class='hs-layout'>{</span><span class='hs-varid'>args</span><span class='hs-keyglyph'>=</span><span class='hs-layout'>(</span><span class='hs-chr'>'-'</span><span class='hs-conop'>:</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-conop'>:</span><span class='hs-varid'>ys</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>xs</span> <span class='hs-varop'>/=</span> <span class='hs-str'>""</span> <span class='hs-keyglyph'>=</span>
<a name="line-67"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>lookupName</span> <span class='hs-layout'>(</span><span class='hs-varid'>pickFlags</span> <span class='hs-conid'>True</span> <span class='hs-varid'>mode</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>of</span>
<a name="line-68"></a> <span class='hs-conid'>Ambiguous</span> <span class='hs-varid'>poss</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>err</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-varid'>ambiguous</span> <span class='hs-str'>"flag"</span> <span class='hs-layout'>(</span><span class='hs-str'>"--"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>poss</span>
<a name="line-69"></a> <span class='hs-conid'>NotFound</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>err</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Unknown flag: --"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>a</span>
<a name="line-70"></a> <span class='hs-conid'>Found</span> <span class='hs-layout'>(</span><span class='hs-varid'>arg</span><span class='hs-layout'>,</span><span class='hs-varid'>flag</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>arg</span> <span class='hs-keyword'>of</span>
<a name="line-71"></a> <span class='hs-conid'>FlagNone</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>upd</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flagValue</span> <span class='hs-varid'>flag</span> <span class='hs-str'>""</span>
<a name="line-72"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>err</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Unhandled argument to flag, none expected: --"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>xs</span>
<a name="line-73"></a> <span class='hs-conid'>FlagReq</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>b</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>null</span> <span class='hs-varid'>ys</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>err</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Flag requires argument: --"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>xs</span>
<a name="line-74"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>upd</span> <span class='hs-varid'>s</span><span class='hs-layout'>{</span><span class='hs-varid'>args</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>tail</span> <span class='hs-varid'>ys</span><span class='hs-layout'>}</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flagValue</span> <span class='hs-varid'>flag</span> <span class='hs-varop'>$</span> <span class='hs-varid'>head</span> <span class='hs-varid'>ys</span>
<a name="line-75"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>upd</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flagValue</span> <span class='hs-varid'>flag</span> <span class='hs-varop'>$</span> <span class='hs-varid'>tail</span> <span class='hs-varid'>b</span>
<a name="line-76"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>upd</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flagValue</span> <span class='hs-varid'>flag</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fromFlagOpt</span> <span class='hs-varid'>arg</span>
<a name="line-77"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>upd</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flagValue</span> <span class='hs-varid'>flag</span> <span class='hs-varop'>$</span> <span class='hs-varid'>tail</span> <span class='hs-varid'>b</span>
<a name="line-78"></a> <span class='hs-keyword'>where</span>
<a name="line-79"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s_</span><span class='hs-layout'>{</span><span class='hs-varid'>args</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>ys</span><span class='hs-layout'>}</span>
<a name="line-80"></a> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>break</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span> <span class='hs-chr'>'='</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span>
<a name="line-81"></a>
<a name="line-82"></a>
<a name="line-83"></a><span class='hs-definition'>processFlag</span> <span class='hs-varid'>mode</span> <span class='hs-varid'>s_</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>S</span><span class='hs-layout'>{</span><span class='hs-varid'>args</span><span class='hs-keyglyph'>=</span><span class='hs-layout'>(</span><span class='hs-chr'>'-'</span><span class='hs-conop'>:</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-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-varop'>/=</span> <span class='hs-chr'>'-'</span> <span class='hs-keyglyph'>=</span>
<a name="line-84"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>lookupName</span> <span class='hs-layout'>(</span><span class='hs-varid'>pickFlags</span> <span class='hs-conid'>False</span> <span class='hs-varid'>mode</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-keyword'>of</span>
<a name="line-85"></a> <span class='hs-conid'>Ambiguous</span> <span class='hs-varid'>poss</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>err</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-varid'>ambiguous</span> <span class='hs-str'>"flag"</span> <span class='hs-keyglyph'>[</span><span class='hs-chr'>'-'</span><span class='hs-layout'>,</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>poss</span>
<a name="line-86"></a> <span class='hs-conid'>NotFound</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>err</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Unknown flag: -"</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span>
<a name="line-87"></a> <span class='hs-conid'>Found</span> <span class='hs-layout'>(</span><span class='hs-varid'>arg</span><span class='hs-layout'>,</span><span class='hs-varid'>flag</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>arg</span> <span class='hs-keyword'>of</span>
<a name="line-88"></a> <span class='hs-conid'>FlagNone</span> <span class='hs-keyglyph'>|</span> <span class='hs-str'>"="</span> <span class='hs-varop'>`isPrefixOf`</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>err</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Unhandled argument to flag, none expected: -"</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span>
<a name="line-89"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>upd</span> <span class='hs-varid'>s_</span><span class='hs-layout'>{</span><span class='hs-varid'>args</span><span class='hs-keyglyph'>=</span><span class='hs-keyglyph'>[</span><span class='hs-chr'>'-'</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-keyglyph'>|</span><span class='hs-varid'>xs</span><span class='hs-varop'>/=</span><span class='hs-str'>""</span><span class='hs-keyglyph'>]</span> <span class='hs-varop'>++</span> <span class='hs-varid'>ys</span><span class='hs-layout'>}</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flagValue</span> <span class='hs-varid'>flag</span> <span class='hs-str'>""</span>
<a name="line-90"></a> <span class='hs-conid'>FlagReq</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>xs</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>null</span> <span class='hs-varid'>ys</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>err</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Flag requires argument: -"</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span>
<a name="line-91"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>upd</span> <span class='hs-varid'>s_</span><span class='hs-layout'>{</span><span class='hs-varid'>args</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>tail</span> <span class='hs-varid'>ys</span><span class='hs-layout'>}</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flagValue</span> <span class='hs-varid'>flag</span> <span class='hs-varop'>$</span> <span class='hs-varid'>head</span> <span class='hs-varid'>ys</span>
<a name="line-92"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>upd</span> <span class='hs-varid'>s_</span><span class='hs-layout'>{</span><span class='hs-varid'>args</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>ys</span><span class='hs-layout'>}</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flagValue</span> <span class='hs-varid'>flag</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>if</span> <span class='hs-str'>"="</span> <span class='hs-varop'>`isPrefixOf`</span> <span class='hs-varid'>xs</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>tail</span> <span class='hs-varid'>xs</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>xs</span>
<a name="line-93"></a> <span class='hs-conid'>FlagOpt</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>upd</span> <span class='hs-varid'>s_</span><span class='hs-layout'>{</span><span class='hs-varid'>args</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>ys</span><span class='hs-layout'>}</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flagValue</span> <span class='hs-varid'>flag</span> <span class='hs-varid'>x</span>
<a name="line-94"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>upd</span> <span class='hs-varid'>s_</span><span class='hs-layout'>{</span><span class='hs-varid'>args</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>ys</span><span class='hs-layout'>}</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flagValue</span> <span class='hs-varid'>flag</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>if</span> <span class='hs-str'>"="</span> <span class='hs-varop'>`isPrefixOf`</span> <span class='hs-varid'>xs</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>tail</span> <span class='hs-varid'>xs</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>xs</span>
<a name="line-95"></a> <span class='hs-conid'>FlagOptRare</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>|</span> <span class='hs-str'>"="</span> <span class='hs-varop'>`isPrefixOf`</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>upd</span> <span class='hs-varid'>s_</span><span class='hs-layout'>{</span><span class='hs-varid'>args</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>ys</span><span class='hs-layout'>}</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flagValue</span> <span class='hs-varid'>flag</span> <span class='hs-varop'>$</span> <span class='hs-varid'>tail</span> <span class='hs-varid'>xs</span>
<a name="line-96"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>upd</span> <span class='hs-varid'>s_</span><span class='hs-layout'>{</span><span class='hs-varid'>args</span><span class='hs-keyglyph'>=</span><span class='hs-keyglyph'>[</span><span class='hs-chr'>'-'</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-keyglyph'>|</span><span class='hs-varid'>xs</span><span class='hs-varop'>/=</span><span class='hs-str'>""</span><span class='hs-keyglyph'>]</span> <span class='hs-varop'>++</span> <span class='hs-varid'>ys</span><span class='hs-layout'>}</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flagValue</span> <span class='hs-varid'>flag</span> <span class='hs-varid'>x</span>
<a name="line-97"></a> <span class='hs-keyword'>where</span>
<a name="line-98"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s_</span><span class='hs-layout'>{</span><span class='hs-varid'>args</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>ys</span><span class='hs-layout'>}</span>
<a name="line-99"></a>
<a name="line-100"></a>
<a name="line-101"></a><span class='hs-definition'>processFlag</span> <span class='hs-varid'>mode</span> <span class='hs-varid'>s_</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>S</span><span class='hs-layout'>{</span><span class='hs-varid'>args</span><span class='hs-keyglyph'>=</span><span class='hs-str'>"--"</span><span class='hs-conop'>:</span><span class='hs-varid'>ys</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s_</span><span class='hs-layout'>{</span><span class='hs-varid'>args</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>ys</span><span class='hs-layout'>}</span>
<a name="line-102"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isJust</span> <span class='hs-varop'>$</span> <span class='hs-varid'>stop</span> <span class='hs-varid'>mode</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s</span>
<a name="line-103"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-varid'>processArg</span> <span class='hs-varid'>mode</span> <span class='hs-varid'>s</span>
<a name="line-104"></a>
<a name="line-105"></a><span class='hs-definition'>processFlag</span> <span class='hs-varid'>mode</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>processArg</span> <span class='hs-varid'>mode</span> <span class='hs-varid'>s</span>
<a name="line-106"></a>
<a name="line-107"></a><a name="processArg"></a><span class='hs-definition'>processArg</span> <span class='hs-varid'>mode</span> <span class='hs-varid'>s_</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>S</span><span class='hs-layout'>{</span><span class='hs-varid'>args</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>ys</span><span class='hs-layout'>,</span> <span class='hs-varid'>argsCount</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>count</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>argsPick</span> <span class='hs-varid'>mode</span> <span class='hs-varid'>count</span> <span class='hs-keyword'>of</span>
<a name="line-108"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>err</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Unhandled argument, "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>str</span> <span class='hs-varop'>++</span> <span class='hs-str'>" expected: "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>x</span>
<a name="line-109"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>count</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span> <span class='hs-keyword'>then</span> <span class='hs-str'>"none"</span> <span class='hs-keyword'>else</span> <span class='hs-str'>"at most "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>count</span>
<a name="line-110"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>arg</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>argValue</span> <span class='hs-varid'>arg</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-varid'>val</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-111"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>err</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Unhandled argument, "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>e</span> <span class='hs-varop'>++</span> <span class='hs-str'>": "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>x</span>
<a name="line-112"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span><span class='hs-layout'>{</span><span class='hs-varid'>val</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>v</span><span class='hs-layout'>}</span>
<a name="line-113"></a> <span class='hs-keyword'>where</span>
<a name="line-114"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s_</span><span class='hs-layout'>{</span><span class='hs-varid'>args</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>ys</span><span class='hs-layout'>,</span> <span class='hs-varid'>argsCount</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>count</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>}</span>
<a name="line-115"></a>
<a name="line-116"></a>
<a name="line-117"></a><a name="argsRange"></a><span class='hs-comment'>-- find the minimum and maximum allowed number of arguments (Nothing=infinite)</span>
<a name="line-118"></a><span class='hs-definition'>argsRange</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Mode</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-119"></a><span class='hs-definition'>argsRange</span> <span class='hs-conid'>Mode</span><span class='hs-layout'>{</span><span class='hs-varid'>modeArgs</span><span class='hs-keyglyph'>=</span><span class='hs-layout'>(</span><span class='hs-varid'>lst</span><span class='hs-layout'>,</span><span class='hs-varid'>end</span><span class='hs-layout'>)</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>mn</span><span class='hs-layout'>,</span><span class='hs-varid'>mx</span><span class='hs-layout'>)</span>
<a name="line-120"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>mn</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>length</span> <span class='hs-varop'>$</span> <span class='hs-varid'>dropWhile</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varop'>.</span> <span class='hs-varid'>argRequire</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>reverse</span> <span class='hs-varop'>$</span> <span class='hs-varid'>lst</span> <span class='hs-varop'>++</span> <span class='hs-varid'>maybeToList</span> <span class='hs-varid'>end</span>
<a name="line-121"></a> <span class='hs-varid'>mx</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>isJust</span> <span class='hs-varid'>end</span> <span class='hs-keyword'>then</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyword'>else</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>length</span> <span class='hs-varid'>lst</span>
<a name="line-122"></a>
<a name="line-123"></a>
<a name="line-124"></a><a name="argsPick"></a><span class='hs-definition'>argsPick</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Mode</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Arg</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-125"></a><span class='hs-definition'>argsPick</span> <span class='hs-conid'>Mode</span><span class='hs-layout'>{</span><span class='hs-varid'>modeArgs</span><span class='hs-keyglyph'>=</span><span class='hs-layout'>(</span><span class='hs-varid'>lst</span><span class='hs-layout'>,</span><span class='hs-varid'>end</span><span class='hs-layout'>)</span><span class='hs-layout'>}</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>i</span> <span class='hs-varop'><</span> <span class='hs-varid'>length</span> <span class='hs-varid'>lst</span> <span class='hs-keyword'>then</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>lst</span> <span class='hs-varop'>!!</span> <span class='hs-varid'>i</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>end</span>
<a name="line-126"></a>
<a name="line-127"></a>
<a name="line-128"></a><span class='hs-comment'>---------------------------------------------------------------------</span>
<a name="line-129"></a><span class='hs-comment'>-- UTILITIES</span>
<a name="line-130"></a>
<a name="line-131"></a><a name="ambiguous"></a><span class='hs-definition'>ambiguous</span> <span class='hs-varid'>typ</span> <span class='hs-varid'>got</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Ambiguous "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>typ</span> <span class='hs-varop'>++</span> <span class='hs-str'>" '"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>got</span> <span class='hs-varop'>++</span> <span class='hs-str'>"', could be any of: "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>unwords</span> <span class='hs-varid'>xs</span>
<a name="line-132"></a><a name="missing"></a><span class='hs-definition'>missing</span> <span class='hs-varid'>typ</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Missing "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>typ</span> <span class='hs-varop'>++</span> <span class='hs-str'>", wanted any of: "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>unwords</span> <span class='hs-varid'>xs</span>
<a name="line-133"></a>
<a name="line-134"></a>
<a name="line-135"></a><a name="LookupName"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>LookupName</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>NotFound</span>
<a name="line-136"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Ambiguous</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Name</span><span class='hs-keyglyph'>]</span>
<a name="line-137"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Found</span> <span class='hs-varid'>a</span>
<a name="line-138"></a>
<a name="line-139"></a><a name="lookupName"></a><span class='hs-comment'>-- different order to lookup so can potentially partially-apply it</span>
<a name="line-140"></a><span class='hs-definition'>lookupName</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>Name</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-layout'>)</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-conid'>LookupName</span> <span class='hs-varid'>a</span>
<a name="line-141"></a><span class='hs-definition'>lookupName</span> <span class='hs-varid'>names</span> <span class='hs-varid'>value</span> <span class='hs-keyglyph'>=</span>
<a name="line-142"></a> <span class='hs-keyword'>case</span> <span class='hs-layout'>(</span><span class='hs-varid'>match</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>match</span> <span class='hs-varid'>isPrefixOf</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-143"></a> <span class='hs-layout'>(</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>NotFound</span>
<a name="line-144"></a> <span class='hs-layout'>(</span><span class='hs-conid'>[]</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-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Found</span> <span class='hs-varop'>$</span> <span class='hs-varid'>snd</span> <span class='hs-varid'>x</span>
<a name="line-145"></a> <span class='hs-layout'>(</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ambiguous</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>fst</span> <span class='hs-varid'>xs</span>
<a name="line-146"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Found</span> <span class='hs-varop'>$</span> <span class='hs-varid'>snd</span> <span class='hs-varid'>x</span>
<a name="line-147"></a> <span class='hs-layout'>(</span><span class='hs-varid'>xs</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ambiguous</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>fst</span> <span class='hs-varid'>xs</span>
<a name="line-148"></a> <span class='hs-keyword'>where</span>
<a name="line-149"></a> <span class='hs-varid'>match</span> <span class='hs-varid'>op</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>head</span> <span class='hs-varid'>ys</span><span class='hs-layout'>,</span><span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>xs</span><span class='hs-layout'>,</span><span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>names</span><span class='hs-layout'>,</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>ys</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-varid'>op</span> <span class='hs-varid'>value</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span><span class='hs-layout'>,</span> <span class='hs-varid'>ys</span> <span class='hs-varop'>/=</span> <span class='hs-conid'>[]</span><span class='hs-keyglyph'>]</span>
<a name="line-150"></a>
</pre></body>
</html>
distrib
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Fedora
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17
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i386
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updates
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by-pkgid
>
a754cb499dfee5e1f453d3b6cc13d4c8
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148
