<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <!-- Generated by HsColour, http://www.cs.york.ac.uk/fp/darcs/hscolour/ --> <title>Hidden/RegexPRCore.hs</title> <link type='text/css' rel='stylesheet' href='hscolour.css' /> </head> <body> <pre><a name="line-1"></a><span class='hs-comment'>-- RegexPRCore.hs</span> <a name="line-2"></a><span class='hs-comment'>--</span> <a name="line-3"></a><span class='hs-comment'>-- Author: Yoshikuni Jujo <PAF01143@nifty.ne.jp></span> <a name="line-4"></a><span class='hs-comment'>--</span> <a name="line-5"></a> <a name="line-6"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Hidden</span><span class='hs-varop'>.</span><span class='hs-conid'>RegexPRCore</span> <span class='hs-layout'>(</span> <a name="line-7"></a> <span class='hs-varid'>matchRegexPRVerbose</span> <a name="line-8"></a><span class='hs-layout'>,</span> <span class='hs-varid'>multiMatchRegexPRVerbose</span> <a name="line-9"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <a name="line-10"></a> <a name="line-11"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Hidden</span><span class='hs-varop'>.</span><span class='hs-conid'>RegexPRTypes</span> <span class='hs-layout'>(</span> <span class='hs-conid'>RegexParser</span><span class='hs-layout'>,</span> <span class='hs-conid'>MatchList</span><span class='hs-layout'>,</span> <span class='hs-varid'>runRegexParser</span> <span class='hs-layout'>)</span> <a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>ParserCombinators</span><span class='hs-varop'>.</span><span class='hs-conid'>MTLParse</span> <a name="line-13"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>spot</span><span class='hs-layout'>,</span> <span class='hs-varid'>spotBack</span><span class='hs-layout'>,</span> <span class='hs-varid'>still</span><span class='hs-layout'>,</span> <span class='hs-varid'>noBacktrack</span><span class='hs-layout'>,</span> <span class='hs-varid'>parseNot</span><span class='hs-layout'>,</span> <a name="line-14"></a> <span class='hs-varid'>build</span><span class='hs-layout'>,</span> <span class='hs-varid'>tokens</span><span class='hs-layout'>,</span> <span class='hs-varid'>tokensBack</span><span class='hs-layout'>,</span> <a name="line-15"></a> <span class='hs-varid'>repeatParse</span><span class='hs-layout'>,</span> <span class='hs-varid'>greedyRepeatParse</span><span class='hs-layout'>,</span> <a name="line-16"></a> <span class='hs-varid'>beginningOfInput</span><span class='hs-layout'>,</span> <span class='hs-varid'>endOfInput</span><span class='hs-layout'>,</span> <a name="line-17"></a> <span class='hs-conid'>MonadPlus</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>>++></span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span> <a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Hidden</span><span class='hs-varop'>.</span><span class='hs-conid'>ParseRegexStr</span> <span class='hs-layout'>(</span> <span class='hs-conid'>RegexAction</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>parseRegexStr</span> <span class='hs-layout'>)</span> <a name="line-19"></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> <span class='hs-layout'>(</span> <span class='hs-conid'>StateT</span><span class='hs-layout'>,</span> <span class='hs-varid'>runStateT</span><span class='hs-layout'>,</span> <span class='hs-varid'>gets</span><span class='hs-layout'>,</span> <span class='hs-varid'>modify</span><span class='hs-layout'>,</span> <span class='hs-varid'>lift</span><span class='hs-layout'>,</span> <span class='hs-varid'>liftM</span> <span class='hs-layout'>)</span> <a name="line-20"></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'>Reader</span> <span class='hs-layout'>(</span> <span class='hs-varid'>ask</span> <span class='hs-layout'>)</span> <a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Hidden</span><span class='hs-varop'>.</span><span class='hs-conid'>Tools</span> <span class='hs-layout'>(</span> <span class='hs-varid'>guardEqual</span> <span class='hs-layout'>)</span> <a name="line-22"></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-layout'>(</span> <span class='hs-varid'>unless</span> <span class='hs-layout'>)</span> <a name="line-23"></a> <a name="line-24"></a><a name="matchRegexPRVerbose"></a><span class='hs-definition'>matchRegexPRVerbose</span> <span class='hs-keyglyph'>::</span> <a name="line-25"></a> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span> <a name="line-26"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>MatchList</span> <span class='hs-layout'>)</span> <a name="line-27"></a><span class='hs-definition'>matchRegexPRVerbose</span> <span class='hs-varid'>reg</span> <span class='hs-varid'>str</span> <a name="line-28"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-layout'>(</span><span class='hs-varid'>runRegexParserTrials</span> <span class='hs-varop'>.</span> <span class='hs-varid'>mkRegexParserTrials</span> <span class='hs-varop'>.</span> <span class='hs-varid'>parseRegexStr</span><span class='hs-layout'>)</span> <span class='hs-varid'>reg</span> <span class='hs-varid'>str</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-conid'>Nothing</span> <a name="line-30"></a> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>ret</span><span class='hs-layout'>,</span> <span class='hs-varid'>pre</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>ml</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>sp</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>pre</span><span class='hs-layout'>,</span> <span class='hs-varid'>ret</span><span class='hs-layout'>,</span> <span class='hs-varid'>sp</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>ml</span> <span class='hs-layout'>)</span> <a name="line-31"></a> <a name="line-32"></a><a name="multiMatchRegexPRVerbose"></a><span class='hs-definition'>multiMatchRegexPRVerbose</span> <span class='hs-keyglyph'>::</span> <a name="line-33"></a> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span> <a name="line-34"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>MatchList</span> <span class='hs-layout'>)</span> <span class='hs-keyglyph'>]</span> <a name="line-35"></a><span class='hs-definition'>multiMatchRegexPRVerbose</span> <span class='hs-varid'>reg</span> <span class='hs-varid'>str</span> <a name="line-36"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>ret</span><span class='hs-layout'>,</span> <span class='hs-varid'>pre</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>ml</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>sp</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>pre</span><span class='hs-layout'>,</span> <span class='hs-varid'>ret</span><span class='hs-layout'>,</span> <span class='hs-varid'>sp</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>ml</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <a name="line-37"></a> <span class='hs-layout'>(</span><span class='hs-varid'>runRegexParserTrials</span> <span class='hs-varop'>.</span> <span class='hs-varid'>mkRegexParserTrials</span> <span class='hs-varop'>.</span> <span class='hs-varid'>parseRegexStr</span><span class='hs-layout'>)</span> <span class='hs-varid'>reg</span> <span class='hs-varid'>str</span> <a name="line-38"></a> <a name="line-39"></a><a name="runRegexParserTrials"></a><span class='hs-definition'>runRegexParserTrials</span> <span class='hs-keyglyph'>::</span> <a name="line-40"></a> <span class='hs-conid'>StateT</span> <span class='hs-conid'>String</span> <span class='hs-conid'>RegexParser</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <a name="line-41"></a> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>MatchList</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <a name="line-42"></a><span class='hs-definition'>runRegexParserTrials</span> <span class='hs-varid'>p</span> <span class='hs-varid'>point</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>runRegexParser</span> <span class='hs-varid'>point</span> <span class='hs-layout'>(</span><span class='hs-varid'>runStateT</span> <span class='hs-varid'>p</span> <span class='hs-str'>""</span><span class='hs-layout'>)</span> <span class='hs-varid'>point</span> <a name="line-43"></a> <a name="line-44"></a><a name="mkRegexParserTrials"></a><span class='hs-definition'>mkRegexParserTrials</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>RegexAction</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StateT</span> <span class='hs-conid'>String</span> <span class='hs-conid'>RegexParser</span> <span class='hs-conid'>String</span> <a name="line-45"></a><span class='hs-definition'>mkRegexParserTrials</span> <span class='hs-varid'>ras</span> <a name="line-46"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkRegexParser</span> <span class='hs-conid'>False</span> <span class='hs-varid'>ras</span><span class='hs-layout'>)</span> <span class='hs-varop'>`mplus`</span> <a name="line-47"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>spot</span> <span class='hs-varop'>$</span> <span class='hs-varid'>const</span> <span class='hs-conid'>True</span> <a name="line-48"></a> <span class='hs-varid'>modify</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span> <a name="line-49"></a> <span class='hs-varid'>mkRegexParserTrials</span> <span class='hs-varid'>ras</span> <a name="line-50"></a> <a name="line-51"></a><a name="mkRegexParser"></a><span class='hs-definition'>mkRegexParser</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>RegexAction</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RegexParser</span> <span class='hs-conid'>String</span> <a name="line-52"></a><span class='hs-definition'>mkRegexParser</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-str'>""</span> <a name="line-53"></a><span class='hs-definition'>mkRegexParser</span> <span class='hs-varid'>isBack</span> <span class='hs-layout'>(</span><span class='hs-varid'>ra</span><span class='hs-conop'>:</span><span class='hs-varid'>ras</span><span class='hs-layout'>)</span> <a name="line-54"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>ra</span> <span class='hs-keyword'>of</span> <a name="line-55"></a> <span class='hs-conid'>Select</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>selectParserFB</span> <span class='hs-varid'>s</span> <a name="line-56"></a> <span class='hs-conid'>Repeat</span> <span class='hs-varid'>mn</span> <span class='hs-varid'>mx</span> <span class='hs-varid'>rb</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>liftM</span> <span class='hs-varid'>concat</span> <span class='hs-varop'>.</span> <span class='hs-varid'>greedyRepeatParse</span> <span class='hs-varid'>mn</span> <span class='hs-varid'>mx</span> <span class='hs-varop'>$</span> <a name="line-57"></a> <span class='hs-varid'>mkRegexParser</span> <span class='hs-varid'>isBack</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>rb</span><span class='hs-keyglyph'>]</span> <a name="line-58"></a> <span class='hs-conid'>RepeatNotGreedy</span> <span class='hs-varid'>mn</span> <span class='hs-varid'>mx</span> <span class='hs-varid'>rb</span> <a name="line-59"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>liftM</span> <span class='hs-varid'>concat</span> <span class='hs-varop'>.</span> <span class='hs-varid'>repeatParse</span> <span class='hs-varid'>mn</span> <span class='hs-varid'>mx</span> <span class='hs-varop'>$</span> <a name="line-60"></a> <span class='hs-varid'>mkRegexParser</span> <span class='hs-varid'>isBack</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>rb</span><span class='hs-keyglyph'>]</span> <a name="line-61"></a> <span class='hs-conid'>Note</span> <span class='hs-varid'>i</span> <span class='hs-varid'>acts</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>noteParens</span> <span class='hs-varid'>isBack</span> <span class='hs-varid'>i</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mkRegexParser</span> <span class='hs-varid'>isBack</span> <span class='hs-varid'>acts</span> <a name="line-62"></a> <span class='hs-conid'>BackReference</span> <span class='hs-varid'>ri</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>backReference</span> <span class='hs-varid'>isBack</span> <span class='hs-varid'>ri</span> <a name="line-63"></a> <span class='hs-conid'>RegexOr</span> <span class='hs-varid'>ra1</span> <span class='hs-varid'>ra2</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mkRegexParser</span> <span class='hs-varid'>isBack</span> <span class='hs-varid'>ra1</span> <span class='hs-varop'>`mplus`</span> <a name="line-64"></a> <span class='hs-varid'>mkRegexParser</span> <span class='hs-varid'>isBack</span> <span class='hs-varid'>ra2</span> <a name="line-65"></a> <span class='hs-conid'>EndOfInput</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>endOfInput</span> <span class='hs-str'>""</span> <a name="line-66"></a> <span class='hs-conid'>BeginningOfInput</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>beginningOfInput</span> <span class='hs-str'>""</span> <a name="line-67"></a> <span class='hs-conid'>Still</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Backword</span> <span class='hs-varid'>acts</span><span class='hs-keyglyph'>]</span> <a name="line-68"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>still</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkRegexParser</span> <span class='hs-conid'>True</span> <span class='hs-varid'>acts</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <a name="line-69"></a> <span class='hs-varid'>unless</span> <span class='hs-varid'>isBack</span> <span class='hs-layout'>(</span><span class='hs-varid'>modify</span> <span class='hs-varid'>reverse</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-str'>""</span> <a name="line-70"></a> <span class='hs-conid'>Still</span> <span class='hs-varid'>acts</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>still</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkRegexParser</span> <span class='hs-conid'>False</span> <span class='hs-varid'>acts</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-str'>""</span> <a name="line-71"></a> <span class='hs-conid'>Backword</span> <span class='hs-varid'>acts</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mkRegexParser</span> <span class='hs-conid'>True</span> <span class='hs-varid'>acts</span> <a name="line-72"></a> <span class='hs-conid'>RegActNot</span> <span class='hs-varid'>acts</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>parseNot</span> <span class='hs-str'>""</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mkRegexParser</span> <span class='hs-varid'>isBack</span> <span class='hs-varid'>acts</span> <a name="line-73"></a> <span class='hs-conid'>PreMatchPoint</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>guardEqual</span> <span class='hs-varid'>ask</span> <span class='hs-layout'>(</span><span class='hs-varid'>lift</span> <span class='hs-varid'>ask</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-str'>""</span> <a name="line-74"></a> <span class='hs-conid'>Parens</span> <span class='hs-varid'>acts</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mkRegexParser</span> <span class='hs-varid'>isBack</span> <span class='hs-varid'>acts</span> <a name="line-75"></a> <span class='hs-conid'>Comment</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-str'>""</span> <a name="line-76"></a> <span class='hs-conid'>NopRegex</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-str'>""</span> <a name="line-77"></a> <span class='hs-conid'>NoBacktrack</span> <span class='hs-varid'>acts</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>noBacktrack</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mkRegexParser</span> <span class='hs-varid'>isBack</span> <span class='hs-varid'>acts</span> <a name="line-78"></a> <span class='hs-varop'>>++></span> <span class='hs-varid'>mkRegexParser</span> <span class='hs-varid'>isBack</span> <span class='hs-varid'>ras</span> <a name="line-79"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>selectParserFB</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>isBack</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>selectParserBack</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>selectParser</span> <a name="line-80"></a> <a name="line-81"></a><a name="selectParser"></a><span class='hs-definition'>selectParser</span><span class='hs-layout'>,</span> <span class='hs-varid'>selectParserBack</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RegexParser</span> <span class='hs-conid'>String</span> <a name="line-82"></a><span class='hs-definition'>selectParser</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>spot</span> <span class='hs-varid'>s</span> <span class='hs-varop'>`build`</span> <span class='hs-layout'>(</span><span class='hs-conop'>:</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <a name="line-83"></a><a name="selectParserBack"></a><span class='hs-definition'>selectParserBack</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>spotBack</span> <span class='hs-varid'>s</span> <span class='hs-varop'>`build`</span> <span class='hs-layout'>(</span><span class='hs-conop'>:</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <a name="line-84"></a> <a name="line-85"></a><a name="noteParens"></a><span class='hs-definition'>noteParens</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RegexParser</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RegexParser</span> <span class='hs-conid'>String</span> <a name="line-86"></a><span class='hs-definition'>noteParens</span> <span class='hs-varid'>isBack</span> <span class='hs-varid'>i</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>p</span> <a name="line-87"></a> <span class='hs-varid'>modify</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-keyword'>if</span> <span class='hs-varid'>isBack</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>reverse</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>id</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span> <a name="line-88"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span> <a name="line-89"></a> <a name="line-90"></a><a name="backReference"></a><span class='hs-definition'>backReference</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RegexParser</span> <span class='hs-conid'>String</span> <a name="line-91"></a><span class='hs-definition'>backReference</span> <span class='hs-varid'>isBack</span> <span class='hs-varid'>i</span> <a name="line-92"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>gets</span> <span class='hs-layout'>(</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-varop'>>>=</span> <a name="line-93"></a> <span class='hs-varid'>maybe</span> <span class='hs-varid'>mzero</span> <span class='hs-layout'>(</span><span class='hs-keyword'>if</span> <span class='hs-varid'>isBack</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>tokensBack</span> <span class='hs-varop'>.</span> <span class='hs-varid'>reverse</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>tokens</span><span class='hs-layout'>)</span> </pre></body> </html>
