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<pre><a name="line-1"></a><span class='hs-comment'>-- ------------------------------------------------------------</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>{- |
<a name="line-4"></a> Module : Data.Set.CharSet
<a name="line-5"></a> Copyright : Copyright (C) 2010 - Uwe Schmidt
<a name="line-6"></a> License : MIT
<a name="line-7"></a>
<a name="line-8"></a> Maintainer : Uwe Schmidt (uwe@fh-wedel.de)
<a name="line-9"></a> Stability : stable
<a name="line-10"></a> Portability: portable
<a name="line-11"></a>
<a name="line-12"></a> Char sets implemeted as non overlapping sorted lists of intervalls
<a name="line-13"></a>
<a name="line-14"></a>-}</span>
<a name="line-15"></a>
<a name="line-16"></a><span class='hs-comment'>-- ------------------------------------------------------------</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Set</span><span class='hs-varop'>.</span><span class='hs-conid'>CharSet</span>
<a name="line-19"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>CharSet</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>emptyCS</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>allCS</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>singleCS</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stringCS</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>rangeCS</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>nullCS</span>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>fullCS</span>
<a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unionCS</span>
<a name="line-28"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>diffCS</span>
<a name="line-29"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>intersectCS</span>
<a name="line-30"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>exorCS</span>
<a name="line-31"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>compCS</span>
<a name="line-32"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>elemCS</span>
<a name="line-33"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toListCS</span>
<a name="line-34"></a> <span class='hs-layout'>)</span>
<a name="line-35"></a><span class='hs-keyword'>where</span>
<a name="line-36"></a>
<a name="line-37"></a><span class='hs-comment'>-- ------------------------------------------------------------</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="CharSet"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>CharSet</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Char</span><span class='hs-layout'>,</span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-40"></a>
<a name="line-41"></a><a name="emptyCS"></a><span class='hs-definition'>emptyCS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharSet</span>
<a name="line-42"></a><span class='hs-definition'>emptyCS</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-43"></a><span class='hs-comment'>{-# INLINE emptyCS #-}</span>
<a name="line-44"></a>
<a name="line-45"></a><a name="allCS"></a><span class='hs-definition'>allCS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharSet</span>
<a name="line-46"></a><span class='hs-definition'>allCS</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>minBound</span><span class='hs-layout'>,</span> <span class='hs-varid'>maxBound</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-47"></a><span class='hs-comment'>{-# INLINE allCS #-}</span>
<a name="line-48"></a>
<a name="line-49"></a><a name="singleCS"></a><span class='hs-definition'>singleCS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharSet</span>
<a name="line-50"></a><span class='hs-definition'>singleCS</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-51"></a><span class='hs-comment'>{-# INLINE singleCS #-}</span>
<a name="line-52"></a>
<a name="line-53"></a><a name="stringCS"></a><span class='hs-definition'>stringCS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharSet</span>
<a name="line-54"></a><span class='hs-definition'>stringCS</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-varid'>unionCS</span> <span class='hs-varop'>.</span> <span class='hs-varid'>singleCS</span><span class='hs-layout'>)</span> <span class='hs-varid'>emptyCS</span>
<a name="line-55"></a><span class='hs-comment'>{-# INLINE stringCS #-}</span>
<a name="line-56"></a>
<a name="line-57"></a><a name="rangeCS"></a><span class='hs-definition'>rangeCS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharSet</span>
<a name="line-58"></a><span class='hs-definition'>rangeCS</span> <span class='hs-varid'>l</span> <span class='hs-varid'>u</span>
<a name="line-59"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>l</span> <span class='hs-varop'><=</span> <span class='hs-varid'>u</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>u</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-60"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emptyCS</span>
<a name="line-61"></a><span class='hs-comment'>{-# INLINE rangeCS #-}</span>
<a name="line-62"></a>
<a name="line-63"></a><a name="nullCS"></a><span class='hs-definition'>nullCS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-64"></a><span class='hs-definition'>nullCS</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>null</span>
<a name="line-65"></a><span class='hs-comment'>{-# INLINE nullCS #-}</span>
<a name="line-66"></a>
<a name="line-67"></a><a name="fullCS"></a><span class='hs-definition'>fullCS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-68"></a><span class='hs-definition'>fullCS</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>lb</span><span class='hs-layout'>,</span> <span class='hs-varid'>ub</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-69"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lb</span> <span class='hs-varop'>==</span> <span class='hs-varid'>minBound</span>
<a name="line-70"></a> <span class='hs-varop'>&&</span>
<a name="line-71"></a> <span class='hs-varid'>ub</span> <span class='hs-varop'>==</span> <span class='hs-varid'>maxBound</span>
<a name="line-72"></a><span class='hs-definition'>fullCS</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-73"></a>
<a name="line-74"></a><a name="elemCS"></a><span class='hs-definition'>elemCS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-75"></a><span class='hs-definition'>elemCS</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-varid'>lb</span><span class='hs-layout'>,</span> <span class='hs-varid'>ub</span><span class='hs-layout'>)</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>i</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>lb</span> <span class='hs-varop'>&&</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span> <span class='hs-varop'><=</span> <span class='hs-varid'>ub</span> <span class='hs-varop'>||</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-conid'>False</span>
<a name="line-76"></a><span class='hs-comment'>{-# INLINE elemCS #-}</span>
<a name="line-77"></a>
<a name="line-78"></a><a name="toListCS"></a><span class='hs-definition'>toListCS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span>
<a name="line-79"></a><span class='hs-definition'>toListCS</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concatMap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-varid'>lb</span><span class='hs-layout'>,</span> <span class='hs-varid'>ub</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>lb</span><span class='hs-keyglyph'>..</span><span class='hs-varid'>ub</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-80"></a>
<a name="line-81"></a><a name="unionCS"></a><span class='hs-definition'>unionCS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharSet</span>
<a name="line-82"></a>
<a name="line-83"></a><span class='hs-definition'>unionCS</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>s2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s2</span>
<a name="line-84"></a><span class='hs-definition'>unionCS</span> <span class='hs-varid'>s1</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s1</span>
<a name="line-85"></a>
<a name="line-86"></a><span class='hs-definition'>unionCS</span> <span class='hs-varid'>s1</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>l1</span><span class='hs-layout'>,</span><span class='hs-varid'>u1</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>s1'</span><span class='hs-layout'>)</span> <span class='hs-varid'>s2</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>l2</span><span class='hs-layout'>,</span><span class='hs-varid'>u2</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>s2'</span><span class='hs-layout'>)</span>
<a name="line-87"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>l1</span> <span class='hs-varop'><</span> <span class='hs-varid'>l2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>union</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>u1</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unionCS</span> <span class='hs-varid'>s1'</span> <span class='hs-varid'>s2</span>
<a name="line-88"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>l1</span> <span class='hs-varop'>==</span> <span class='hs-varid'>l2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>union</span> <span class='hs-varid'>l1</span> <span class='hs-layout'>(</span><span class='hs-varid'>u1</span> <span class='hs-varop'>`max`</span> <span class='hs-varid'>u2</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unionCS</span> <span class='hs-varid'>s1'</span> <span class='hs-varid'>s2'</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'>union</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>u2</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unionCS</span> <span class='hs-varid'>s1</span> <span class='hs-varid'>s2'</span>
<a name="line-90"></a> <span class='hs-comment'>-- l1 > l2</span>
<a name="line-91"></a> <span class='hs-keyword'>where</span>
<a name="line-92"></a> <span class='hs-varid'>union</span> <span class='hs-varid'>l</span> <span class='hs-varid'>u</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>u</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-93"></a> <span class='hs-varid'>union</span> <span class='hs-varid'>l</span> <span class='hs-varid'>u</span> <span class='hs-varid'>s</span><span class='hs-keyglyph'>@</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'>u'</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-94"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>u</span> <span class='hs-varop'><</span> <span class='hs-varid'>pred</span> <span class='hs-varid'>l'</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>u</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-varid'>s</span>
<a name="line-95"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>union</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-varid'>u</span> <span class='hs-varop'>`max`</span> <span class='hs-varid'>u'</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
<a name="line-96"></a>
<a name="line-97"></a><a name="diffCS"></a><span class='hs-definition'>diffCS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharSet</span>
<a name="line-98"></a>
<a name="line-99"></a><span class='hs-definition'>diffCS</span> <span class='hs-conid'>[]</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-100"></a><span class='hs-definition'>diffCS</span> <span class='hs-varid'>s</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s</span>
<a name="line-101"></a>
<a name="line-102"></a><span class='hs-definition'>diffCS</span> <span class='hs-varid'>s1</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>l1</span><span class='hs-layout'>,</span><span class='hs-varid'>u1</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>s1'</span><span class='hs-layout'>)</span> <span class='hs-varid'>s2</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>l2</span><span class='hs-layout'>,</span><span class='hs-varid'>u2</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>s2'</span><span class='hs-layout'>)</span>
<a name="line-103"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>u1</span> <span class='hs-varop'><</span> <span class='hs-varid'>l2</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>l1</span><span class='hs-layout'>,</span><span class='hs-varid'>u1</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-varid'>diffCS</span> <span class='hs-varid'>s1'</span> <span class='hs-varid'>s2</span> <span class='hs-comment'>-- whole intervall remains in set</span>
<a name="line-104"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>u2</span> <span class='hs-varop'><</span> <span class='hs-varid'>l1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>diffCS</span> <span class='hs-varid'>s1</span> <span class='hs-varid'>s2'</span> <span class='hs-comment'>-- no elements to remove</span>
<a name="line-105"></a> <span class='hs-comment'>-- intervalls overlap</span>
<a name="line-106"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>p</span> <span class='hs-varop'>++</span> <span class='hs-varid'>diffCS</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span> <span class='hs-varop'>++</span> <span class='hs-varid'>s1'</span><span class='hs-layout'>)</span> <span class='hs-varid'>s2</span>
<a name="line-107"></a> <span class='hs-keyword'>where</span>
<a name="line-108"></a> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>l1</span> <span class='hs-varop'><</span> <span class='hs-varid'>l2</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>l1</span><span class='hs-layout'>,</span> <span class='hs-varid'>pred</span> <span class='hs-varid'>l2</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- = rangeCS l1 (pred l2), but prevent underflow</span>
<a name="line-109"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-110"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>u2</span> <span class='hs-varop'><</span> <span class='hs-varid'>u1</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>succ</span> <span class='hs-varid'>u2</span><span class='hs-layout'>,</span> <span class='hs-varid'>u1</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- = rangeCS (succ u2) u1, but prevent overflow</span>
<a name="line-111"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-112"></a>
<a name="line-113"></a><a name="compCS"></a><span class='hs-definition'>compCS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharSet</span>
<a name="line-114"></a><span class='hs-definition'>compCS</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>allCS</span> <span class='hs-varop'>`diffCS`</span><span class='hs-layout'>)</span>
<a name="line-115"></a>
<a name="line-116"></a><a name="intersectCS"></a><span class='hs-definition'>intersectCS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharSet</span>
<a name="line-117"></a>
<a name="line-118"></a><span class='hs-definition'>intersectCS</span> <span class='hs-conid'>[]</span> <span class='hs-sel'>_s2</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-119"></a><span class='hs-definition'>intersectCS</span> <span class='hs-sel'>_s1</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-120"></a>
<a name="line-121"></a><span class='hs-definition'>intersectCS</span> <span class='hs-varid'>s1</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>l1</span><span class='hs-layout'>,</span><span class='hs-varid'>u1</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>s1'</span><span class='hs-layout'>)</span> <span class='hs-varid'>s2</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>l2</span><span class='hs-layout'>,</span><span class='hs-varid'>u2</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>s2'</span><span class='hs-layout'>)</span>
<a name="line-122"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>u1</span> <span class='hs-varop'><</span> <span class='hs-varid'>l2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>intersectCS</span> <span class='hs-varid'>s1'</span> <span class='hs-varid'>s2</span>
<a name="line-123"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>u2</span> <span class='hs-varop'><</span> <span class='hs-varid'>l1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>intersectCS</span> <span class='hs-varid'>s1</span> <span class='hs-varid'>s2'</span>
<a name="line-124"></a> <span class='hs-comment'>-- intervalls overlap</span>
<a name="line-125"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i</span> <span class='hs-conop'>:</span> <span class='hs-varid'>isect</span>
<a name="line-126"></a> <span class='hs-keyword'>where</span>
<a name="line-127"></a> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>l1</span> <span class='hs-varop'>`max`</span> <span class='hs-varid'>l2</span><span class='hs-layout'>,</span> <span class='hs-varid'>u1</span> <span class='hs-varop'>`min`</span> <span class='hs-varid'>u2</span><span class='hs-layout'>)</span>
<a name="line-128"></a> <span class='hs-varid'>isect</span>
<a name="line-129"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>u1</span> <span class='hs-varop'><</span> <span class='hs-varid'>u2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>intersectCS</span> <span class='hs-varid'>s1'</span> <span class='hs-varid'>s2</span>
<a name="line-130"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>intersectCS</span> <span class='hs-varid'>s1</span> <span class='hs-varid'>s2'</span>
<a name="line-131"></a>
<a name="line-132"></a><a name="exorCS"></a><span class='hs-definition'>exorCS</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharSet</span>
<a name="line-133"></a>
<a name="line-134"></a><span class='hs-definition'>exorCS</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>s2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s2</span>
<a name="line-135"></a><span class='hs-definition'>exorCS</span> <span class='hs-varid'>s1</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s1</span>
<a name="line-136"></a>
<a name="line-137"></a><span class='hs-definition'>exorCS</span> <span class='hs-varid'>s1</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-varid'>i1</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-varid'>l1</span><span class='hs-layout'>,</span><span class='hs-varid'>u1</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>s1'</span><span class='hs-layout'>)</span> <span class='hs-varid'>s2</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-varid'>i2</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-varid'>l2</span><span class='hs-layout'>,</span><span class='hs-varid'>u2</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>s2'</span><span class='hs-layout'>)</span>
<a name="line-138"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>u1</span> <span class='hs-varop'><</span> <span class='hs-varid'>l2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i1</span> <span class='hs-conop'>:</span> <span class='hs-varid'>exorCS</span> <span class='hs-varid'>s1'</span> <span class='hs-varid'>s2</span>
<a name="line-139"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>u2</span> <span class='hs-varop'><</span> <span class='hs-varid'>l1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i2</span> <span class='hs-conop'>:</span> <span class='hs-varid'>exorCS</span> <span class='hs-varid'>s1</span> <span class='hs-varid'>s2'</span>
<a name="line-140"></a> <span class='hs-comment'>-- intervalls overlap</span>
<a name="line-141"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i</span> <span class='hs-varop'>++</span> <span class='hs-varid'>exor'</span>
<a name="line-142"></a> <span class='hs-keyword'>where</span>
<a name="line-143"></a> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>l1</span> <span class='hs-varop'><</span> <span class='hs-varid'>l2</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>l1</span><span class='hs-layout'>,</span> <span class='hs-varid'>pred</span> <span class='hs-varid'>l2</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-144"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>l2</span> <span class='hs-varop'><</span> <span class='hs-varid'>l1</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>l2</span><span class='hs-layout'>,</span> <span class='hs-varid'>pred</span> <span class='hs-varid'>l1</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-145"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-146"></a> <span class='hs-varid'>exor'</span>
<a name="line-147"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>u1</span> <span class='hs-varop'><</span> <span class='hs-varid'>u2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>exorCS</span> <span class='hs-varid'>s1'</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>succ</span> <span class='hs-varid'>u1</span><span class='hs-layout'>,</span> <span class='hs-varid'>u2</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-varid'>s2'</span><span class='hs-layout'>)</span>
<a name="line-148"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>u2</span> <span class='hs-varop'><</span> <span class='hs-varid'>u1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>exorCS</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>succ</span> <span class='hs-varid'>u2</span><span class='hs-layout'>,</span> <span class='hs-varid'>u1</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-varid'>s1'</span><span class='hs-layout'>)</span> <span class='hs-varid'>s2'</span>
<a name="line-149"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>exorCS</span> <span class='hs-varid'>s1'</span> <span class='hs-varid'>s2'</span>
<a name="line-150"></a>
<a name="line-151"></a><span class='hs-comment'>-- ------------------------------------------------------------</span>
</pre></body>
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