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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE FlexibleContexts, FlexibleInstances, MultiParamTypeClasses #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>-- (c) 2002 by Martin Erwig [see file COPYRIGHT]</span>
<a name="line-4"></a><span class='hs-comment'>-- | Static IOArray-based Graphs</span>
<a name="line-5"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Graph</span><span class='hs-varop'>.</span><span class='hs-conid'>Inductive</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>STArray</span><span class='hs-layout'>(</span>
<a name="line-6"></a> <span class='hs-comment'>-- * Graph Representation</span>
<a name="line-7"></a> <span class='hs-conid'>SGr</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>GraphRep</span><span class='hs-layout'>,</span> <span class='hs-conid'>Context'</span><span class='hs-layout'>,</span> <span class='hs-conid'>USGr</span><span class='hs-layout'>,</span>
<a name="line-8"></a> <span class='hs-varid'>defaultGraphSize</span><span class='hs-layout'>,</span> <span class='hs-varid'>emptyN</span><span class='hs-layout'>,</span>
<a name="line-9"></a> <span class='hs-comment'>-- * Utilities</span>
<a name="line-10"></a> <span class='hs-varid'>removeDel</span><span class='hs-layout'>,</span>
<a name="line-11"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-12"></a>
<a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Graph</span><span class='hs-varop'>.</span><span class='hs-conid'>Inductive</span><span class='hs-varop'>.</span><span class='hs-conid'>Graph</span>
<a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Graph</span><span class='hs-varop'>.</span><span class='hs-conid'>Inductive</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-15"></a>
<a name="line-16"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-17"></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'>ST</span>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Array</span>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Array</span><span class='hs-varop'>.</span><span class='hs-conid'>ST</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span>
<a name="line-21"></a>
<a name="line-22"></a>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-comment'>----------------------------------------------------------------------</span>
<a name="line-25"></a><span class='hs-comment'>-- GRAPH REPRESENTATION</span>
<a name="line-26"></a><span class='hs-comment'>----------------------------------------------------------------------</span>
<a name="line-27"></a>
<a name="line-28"></a><a name="SGr"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>SGr</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SGr</span> <span class='hs-layout'>(</span><span class='hs-conid'>GraphRep</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-29"></a>
<a name="line-30"></a><a name="GraphRep"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>GraphRep</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</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'>Array</span> <span class='hs-conid'>Node</span> <span class='hs-layout'>(</span><span class='hs-conid'>Context'</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-conid'>STArray</span> <span class='hs-varid'>s</span> <span class='hs-conid'>Node</span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span>
<a name="line-31"></a><a name="Context'"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Context'</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Adj</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-conid'>Adj</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-32"></a>
<a name="line-33"></a><a name="USGr"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>USGr</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SGr</span> <span class='hs-varid'>s</span> <span class='hs-conid'>()</span> <span class='hs-conid'>()</span>
<a name="line-34"></a>
<a name="line-35"></a>
<a name="line-36"></a><span class='hs-comment'>----------------------------------------------------------------------</span>
<a name="line-37"></a><span class='hs-comment'>-- CLASS INSTANCES</span>
<a name="line-38"></a><span class='hs-comment'>----------------------------------------------------------------------</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="showGraph"></a><span class='hs-comment'>-- Show</span>
<a name="line-41"></a><span class='hs-comment'>--</span>
<a name="line-42"></a><span class='hs-definition'>showGraph</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-conid'>Show</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>GraphRep</span> <span class='hs-conid'>RealWorld</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-43"></a><span class='hs-definition'>showGraph</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concatMap</span> <span class='hs-varid'>showAdj</span> <span class='hs-layout'>(</span><span class='hs-varid'>indices</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-44"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>showAdj</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>unsafeST</span> <span class='hs-layout'>(</span><span class='hs-varid'>readArray</span> <span class='hs-varid'>m</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>""</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-keyword'>case</span> <span class='hs-varid'>a</span><span class='hs-varop'>!</span><span class='hs-varid'>v</span> <span class='hs-keyword'>of</span>
<a name="line-46"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-str'>""</span>
<a name="line-47"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-chr'>'\n'</span><span class='hs-conop'>:</span><span class='hs-varid'>show</span> <span class='hs-varid'>v</span><span class='hs-varop'>++</span><span class='hs-str'>":"</span><span class='hs-varop'>++</span><span class='hs-varid'>show</span> <span class='hs-varid'>l</span><span class='hs-varop'>++</span><span class='hs-str'>"->"</span><span class='hs-varop'>++</span><span class='hs-varid'>show</span> <span class='hs-varid'>s'</span>
<a name="line-48"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafeST</span> <span class='hs-layout'>(</span><span class='hs-varid'>removeDel</span> <span class='hs-varid'>m</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-49"></a>
<a name="line-50"></a><a name="unsafeST"></a><span class='hs-definition'>unsafeST</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ST</span> <span class='hs-conid'>RealWorld</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-51"></a><span class='hs-definition'>unsafeST</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafePerformIO</span> <span class='hs-varop'>.</span> <span class='hs-varid'>stToIO</span>
<a name="line-52"></a>
<a name="line-53"></a><a name="instance%20Show%20(SGr%20RealWorld%20a%20b)"></a><span class='hs-comment'>-- | Please not that this instance is unsafe.</span>
<a name="line-54"></a><a name="instance%20Show%20(SGr%20RealWorld%20a%20b)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-conid'>Show</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Show</span> <span class='hs-layout'>(</span><span class='hs-conid'>SGr</span> <span class='hs-conid'>RealWorld</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-55"></a> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-conid'>SGr</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showGraph</span> <span class='hs-varid'>g</span>
<a name="line-56"></a>
<a name="line-57"></a><span class='hs-comment'>{-
<a name="line-58"></a>run :: Show (IO a) => IO a -> IO ()
<a name="line-59"></a>run x = seq x (print x)
<a name="line-60"></a>-}</span>
<a name="line-61"></a>
<a name="line-62"></a><a name="instance%20GraphM%20(ST%20s)%20(SGr%20s)"></a><span class='hs-comment'>-- GraphM</span>
<a name="line-63"></a><a name="instance%20GraphM%20(ST%20s)%20(SGr%20s)"></a><span class='hs-comment'>--</span>
<a name="line-64"></a><a name="instance%20GraphM%20(ST%20s)%20(SGr%20s)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>GraphM</span> <span class='hs-layout'>(</span><span class='hs-conid'>ST</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>SGr</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-65"></a> <span class='hs-varid'>emptyM</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emptyN</span> <span class='hs-varid'>defaultGraphSize</span>
<a name="line-66"></a> <span class='hs-varid'>isEmptyM</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span><span class='hs-conid'>SGr</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>g</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-varop'>==</span><span class='hs-num'>0</span><span class='hs-layout'>)</span><span class='hs-layout'>}</span>
<a name="line-67"></a> <span class='hs-varid'>matchM</span> <span class='hs-varid'>v</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>g'</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>SGr</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>m</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>g</span>
<a name="line-68"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>a</span><span class='hs-varop'>!</span><span class='hs-varid'>v</span> <span class='hs-keyword'>of</span>
<a name="line-69"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>,</span><span class='hs-varid'>g'</span><span class='hs-layout'>)</span>
<a name="line-70"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>pr</span><span class='hs-layout'>,</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>su</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-71"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>m</span> <span class='hs-varid'>v</span>
<a name="line-72"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>,</span><span class='hs-varid'>g'</span><span class='hs-layout'>)</span> <span class='hs-keyword'>else</span>
<a name="line-73"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>removeDel</span> <span class='hs-varid'>m</span> <span class='hs-varid'>su</span>
<a name="line-74"></a> <span class='hs-varid'>p'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>removeDel</span> <span class='hs-varid'>m</span> <span class='hs-varid'>pr</span>
<a name="line-75"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>/=</span><span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-varop'>.</span><span class='hs-varid'>snd</span><span class='hs-layout'>)</span> <span class='hs-varid'>p'</span>
<a name="line-76"></a> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>m</span> <span class='hs-varid'>v</span> <span class='hs-conid'>True</span>
<a name="line-77"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-layout'>,</span><span class='hs-varid'>v</span><span class='hs-layout'>,</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-conid'>SGr</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>m</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-78"></a> <span class='hs-varid'>mkGraphM</span> <span class='hs-varid'>vs</span> <span class='hs-varid'>es</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newArray</span> <span class='hs-layout'>(</span><span class='hs-num'>1</span><span class='hs-layout'>,</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-conid'>False</span>
<a name="line-79"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>SGr</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-layout'>,</span><span class='hs-varid'>pr</span><span class='hs-layout'>,</span><span class='hs-varid'>m</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-80"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>nod</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>array</span> <span class='hs-varid'>bnds</span> <span class='hs-layout'>(</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-varid'>v</span><span class='hs-layout'>,</span><span class='hs-varid'>l</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>-></span><span class='hs-layout'>(</span><span class='hs-varid'>v</span><span class='hs-layout'>,</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>vs</span><span class='hs-layout'>)</span>
<a name="line-81"></a> <span class='hs-varid'>su</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>accum</span> <span class='hs-varid'>addSuc</span> <span class='hs-varid'>nod</span> <span class='hs-layout'>(</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-varid'>v</span><span class='hs-layout'>,</span><span class='hs-varid'>w</span><span class='hs-layout'>,</span><span class='hs-varid'>l</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>-></span><span class='hs-layout'>(</span><span class='hs-varid'>v</span><span class='hs-layout'>,</span><span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>w</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>es</span><span class='hs-layout'>)</span>
<a name="line-82"></a> <span class='hs-varid'>pr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>accum</span> <span class='hs-varid'>addPre</span> <span class='hs-varid'>su</span> <span class='hs-layout'>(</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-varid'>v</span><span class='hs-layout'>,</span><span class='hs-varid'>w</span><span class='hs-layout'>,</span><span class='hs-varid'>l</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>-></span><span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-layout'>,</span><span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>es</span><span class='hs-layout'>)</span>
<a name="line-83"></a> <span class='hs-varid'>bnds</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>minimum</span> <span class='hs-varid'>vs'</span><span class='hs-layout'>,</span><span class='hs-varid'>maximum</span> <span class='hs-varid'>vs'</span><span class='hs-layout'>)</span>
<a name="line-84"></a> <span class='hs-varid'>vs'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>fst</span> <span class='hs-varid'>vs</span>
<a name="line-85"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>length</span> <span class='hs-varid'>vs</span>
<a name="line-86"></a> <span class='hs-varid'>addSuc</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-layout'>,</span><span class='hs-varid'>l'</span><span class='hs-layout'>,</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-layout'>,</span><span class='hs-varid'>l'</span><span class='hs-layout'>,</span><span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>w</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-87"></a> <span class='hs-varid'>addSuc</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-str'>"mkGraphM (SGr): addSuc Nothing"</span>
<a name="line-88"></a> <span class='hs-varid'>addPre</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-layout'>,</span><span class='hs-varid'>l'</span><span class='hs-layout'>,</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>w</span><span class='hs-layout'>)</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'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>w</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>p</span><span class='hs-layout'>,</span><span class='hs-varid'>l'</span><span class='hs-layout'>,</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-89"></a> <span class='hs-varid'>addPre</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-str'>"mkGraphM (SGr): addPre Nothing"</span>
<a name="line-90"></a> <span class='hs-varid'>labNodesM</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-conid'>SGr</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>m</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>g</span>
<a name="line-91"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>getLNode</span> <span class='hs-varid'>vs</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varid'>vs</span>
<a name="line-92"></a> <span class='hs-varid'>getLNode</span> <span class='hs-varid'>vs</span> <span class='hs-layout'>(</span><span class='hs-varid'>v</span><span class='hs-layout'>,</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-93"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>m</span> <span class='hs-varid'>v</span>
<a name="line-94"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-keyword'>if</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>vs</span> <span class='hs-keyword'>else</span> <span class='hs-layout'>(</span><span class='hs-varid'>v</span><span class='hs-layout'>,</span><span class='hs-varid'>l</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>vs</span><span class='hs-layout'>)</span>
<a name="line-95"></a> <span class='hs-varid'>foldM</span> <span class='hs-varid'>getLNode</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-varid'>assocs</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-96"></a>
<a name="line-97"></a><a name="defaultGraphSize"></a><span class='hs-definition'>defaultGraphSize</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span>
<a name="line-98"></a><span class='hs-definition'>defaultGraphSize</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>100</span>
<a name="line-99"></a>
<a name="line-100"></a><a name="emptyN"></a><span class='hs-definition'>emptyN</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-conid'>SGr</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-101"></a><span class='hs-definition'>emptyN</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newArray</span> <span class='hs-layout'>(</span><span class='hs-num'>1</span><span class='hs-layout'>,</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-conid'>False</span>
<a name="line-102"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>SGr</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-layout'>,</span><span class='hs-varid'>array</span> <span class='hs-layout'>(</span><span class='hs-num'>1</span><span class='hs-layout'>,</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-layout'>,</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>1</span><span class='hs-keyglyph'>..</span><span class='hs-varid'>n</span><span class='hs-keyglyph'>]</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span><span class='hs-varid'>m</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-103"></a>
<a name="line-104"></a><span class='hs-comment'>----------------------------------------------------------------------</span>
<a name="line-105"></a><span class='hs-comment'>-- UTILITIES</span>
<a name="line-106"></a><span class='hs-comment'>----------------------------------------------------------------------</span>
<a name="line-107"></a>
<a name="line-108"></a>
<a name="line-109"></a>
<a name="line-110"></a><a name="removeDel"></a><span class='hs-comment'>-- | filter list (of successors\/predecessors) through a boolean ST array</span>
<a name="line-111"></a><span class='hs-comment'>-- representing deleted marks</span>
<a name="line-112"></a><span class='hs-definition'>removeDel</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>STArray</span> <span class='hs-varid'>s</span> <span class='hs-conid'>Node</span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Adj</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-conid'>Adj</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-113"></a><span class='hs-definition'>removeDel</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filterM</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-keyword'>_</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-keyword'>do</span> <span class='hs-layout'>{</span><span class='hs-varid'>b</span><span class='hs-keyglyph'><-</span><span class='hs-varid'>readArray</span> <span class='hs-varid'>m</span> <span class='hs-varid'>v</span><span class='hs-layout'>;</span><span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-layout'>}</span><span class='hs-layout'>)</span>
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