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<pre><a name="line-1"></a><span class='hs-comment'>-- Copyright (C) 2002 David Roundy</span>
<a name="line-2"></a><span class='hs-comment'>-- Copyright (C) 2005 Benedikt Schmidt</span>
<a name="line-3"></a><span class='hs-comment'>--</span>
<a name="line-4"></a><span class='hs-comment'>-- This program is free software; you can redistribute it and/or modify</span>
<a name="line-5"></a><span class='hs-comment'>-- it under the terms of the GNU General Public License as published by</span>
<a name="line-6"></a><span class='hs-comment'>-- the Free Software Foundation; either version 2, or (at your option)</span>
<a name="line-7"></a><span class='hs-comment'>-- any later version.</span>
<a name="line-8"></a><span class='hs-comment'>--</span>
<a name="line-9"></a><span class='hs-comment'>-- This program is distributed in the hope that it will be useful,</span>
<a name="line-10"></a><span class='hs-comment'>-- but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="line-11"></a><span class='hs-comment'>-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="line-12"></a><span class='hs-comment'>-- GNU General Public License for more details.</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-- You should have received a copy of the GNU General Public License</span>
<a name="line-15"></a><span class='hs-comment'>-- along with this program; see the file COPYING. If not, write to</span>
<a name="line-16"></a><span class='hs-comment'>-- the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,</span>
<a name="line-17"></a><span class='hs-comment'>-- Boston, MA 02110-1301, USA.</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-comment'>{-# OPTIONS_GHC -cpp #-}</span>
<a name="line-20"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-21"></a>
<a name="line-22"></a><span class='hs-comment'>-- | LCS stands for Longest Common Subsequence, and it is a relatively</span>
<a name="line-23"></a><span class='hs-comment'>-- challenging problem to find an LCS efficiently. This module implements</span>
<a name="line-24"></a><span class='hs-comment'>-- the algorithm described in:</span>
<a name="line-25"></a><span class='hs-comment'>--</span>
<a name="line-26"></a><span class='hs-comment'>-- "An O(ND) Difference Algorithm and its Variations", Eugene Myers,</span>
<a name="line-27"></a><span class='hs-comment'>-- Algorithmica Vol. 1 No. 2, 1986, pp. 251-266;</span>
<a name="line-28"></a><span class='hs-comment'>-- especially the variation described in section 4.2 and most refinements</span>
<a name="line-29"></a><span class='hs-comment'>-- implemented in GNU diff (D is the edit-distance).</span>
<a name="line-30"></a><span class='hs-comment'>--</span>
<a name="line-31"></a><span class='hs-comment'>-- There is currently no heuristic to reduce the running time and produce</span>
<a name="line-32"></a><span class='hs-comment'>-- suboptimal output for large inputs with many differences. It behaves like</span>
<a name="line-33"></a><span class='hs-comment'>-- GNU diff with the -d option in this regard.</span>
<a name="line-34"></a><span class='hs-comment'>--</span>
<a name="line-35"></a><span class='hs-comment'>-- In the first step, a hash value for every line is calculated and collisions</span>
<a name="line-36"></a><span class='hs-comment'>-- are marked with a special value. This reduces a string comparison to an</span>
<a name="line-37"></a><span class='hs-comment'>-- int comparison for line tuples where at least one of the hash values is</span>
<a name="line-38"></a><span class='hs-comment'>-- not equal to the special value. After that, lines which only exists in one</span>
<a name="line-39"></a><span class='hs-comment'>-- of the files are removed and marked as changed which reduces the running</span>
<a name="line-40"></a><span class='hs-comment'>-- time of the following difference algorithm. GNU diff additionally removes</span>
<a name="line-41"></a><span class='hs-comment'>-- lines that appear very often in the other file in some cases.</span>
<a name="line-42"></a><span class='hs-comment'>-- The last step tries to create longer changed regions and line up deletions</span>
<a name="line-43"></a><span class='hs-comment'>-- in the first file to insertions in the second by shifting changed lines</span>
<a name="line-44"></a><span class='hs-comment'>-- forward and backward.</span>
<a name="line-45"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Lcs</span> <span class='hs-layout'>(</span> <span class='hs-varid'>getChanges</span><span class='hs-layout'>,</span> <span class='hs-varid'>aLen</span><span class='hs-layout'>,</span>
<a name="line-46"></a> <span class='hs-conid'>BArray</span><span class='hs-layout'>,</span> <span class='hs-conid'>PArray</span><span class='hs-layout'>,</span> <span class='hs-conid'>BSTArray</span><span class='hs-layout'>,</span>
<a name="line-47"></a> <span class='hs-varid'>shiftBoundaries</span> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-48"></a>
<a name="line-49"></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-50"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Int</span>
<a name="line-51"></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-52"></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-53"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>ByteStringUtils</span> <span class='hs-layout'>(</span><span class='hs-varid'>hashPS</span><span class='hs-layout'>)</span>
<a name="line-54"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>B</span> <span class='hs-layout'>(</span><span class='hs-varid'>empty</span><span class='hs-layout'>,</span> <span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span>
<a name="line-55"></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'>Base</span>
<a name="line-56"></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'>Unboxed</span>
<a name="line-57"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Map</span> <span class='hs-layout'>(</span> <span class='hs-varid'>lookup</span><span class='hs-layout'>,</span> <span class='hs-varid'>empty</span><span class='hs-layout'>,</span> <span class='hs-varid'>insertWith</span> <span class='hs-layout'>)</span>
<a name="line-58"></a><span class='hs-cpp'>#include "impossible.h"</span>
<a name="line-59"></a>
<a name="line-60"></a><a name="getChanges"></a><span class='hs-comment'>-- | create a list of changes between a and b, each change has the form</span>
<a name="line-61"></a><span class='hs-comment'>-- (starta, lima, startb, limb) which means that a[starta, lima)</span>
<a name="line-62"></a><span class='hs-comment'>-- has to be replaced by b[startb, limb)</span>
<a name="line-63"></a><span class='hs-definition'>getChanges</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span>
<a name="line-64"></a> <span class='hs-keyglyph'>-></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-keyglyph'>[</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-65"></a><span class='hs-definition'>getChanges</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dropStart</span> <span class='hs-layout'>(</span><span class='hs-varid'>initP</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>initP</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-num'>1</span>
<a name="line-66"></a>
<a name="line-67"></a><a name="dropStart"></a><span class='hs-definition'>dropStart</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-68"></a> <span class='hs-keyglyph'>-></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-keyglyph'>[</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-69"></a><span class='hs-definition'>dropStart</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>off</span>
<a name="line-70"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>off</span> <span class='hs-varop'>></span> <span class='hs-layout'>(</span><span class='hs-varid'>aLen</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-layout'>(</span><span class='hs-varid'>off</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-conid'>[]</span><span class='hs-layout'>,</span> <span class='hs-varid'>getSlice</span> <span class='hs-varid'>b</span> <span class='hs-varid'>off</span> <span class='hs-layout'>(</span><span class='hs-varid'>aLen</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-71"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>off</span> <span class='hs-varop'>></span> <span class='hs-layout'>(</span><span class='hs-varid'>aLen</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>off</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>getSlice</span> <span class='hs-varid'>a</span> <span class='hs-varid'>off</span> <span class='hs-layout'>(</span><span class='hs-varid'>aLen</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-72"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>a</span><span class='hs-varop'>!</span><span class='hs-varid'>off</span> <span class='hs-varop'>==</span> <span class='hs-varid'>b</span><span class='hs-varop'>!</span><span class='hs-varid'>off</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dropStart</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-73"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dropEnd</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>off</span> <span class='hs-num'>0</span>
<a name="line-74"></a>
<a name="line-75"></a><a name="dropEnd"></a><span class='hs-definition'>dropEnd</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-76"></a> <span class='hs-keyglyph'>-></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-keyglyph'>[</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-77"></a><span class='hs-definition'>dropEnd</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>off</span> <span class='hs-varid'>end</span>
<a name="line-78"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>off</span> <span class='hs-varop'>></span> <span class='hs-varid'>alast</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>off</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-conid'>[]</span><span class='hs-layout'>,</span> <span class='hs-varid'>getSlice</span> <span class='hs-varid'>b</span> <span class='hs-varid'>off</span> <span class='hs-varid'>blast</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-79"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>off</span> <span class='hs-varop'>></span> <span class='hs-varid'>blast</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>off</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>getSlice</span> <span class='hs-varid'>a</span> <span class='hs-varid'>off</span> <span class='hs-varid'>alast</span><span class='hs-layout'>,</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-80"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>a</span><span class='hs-varop'>!</span><span class='hs-varid'>alast</span> <span class='hs-varop'>==</span> <span class='hs-varid'>b</span><span class='hs-varop'>!</span><span class='hs-varid'>blast</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dropEnd</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>off</span> <span class='hs-layout'>(</span><span class='hs-varid'>end</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-81"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getChanges'</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-layout'>,</span> <span class='hs-varid'>alast</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-layout'>,</span> <span class='hs-varid'>blast</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-82"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>alast</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>aLen</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-</span> <span class='hs-varid'>end</span>
<a name="line-83"></a> <span class='hs-varid'>blast</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>aLen</span> <span class='hs-varid'>b</span> <span class='hs-comment'>-</span> <span class='hs-varid'>end</span>
<a name="line-84"></a>
<a name="line-85"></a><a name="getSlice"></a><span class='hs-definition'>getSlice</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span>
<a name="line-86"></a><span class='hs-definition'>getSlice</span> <span class='hs-varid'>a</span> <span class='hs-varid'>from</span> <span class='hs-varid'>to</span>
<a name="line-87"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>from</span> <span class='hs-varop'>></span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-88"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-varid'>from</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-layout'>(</span><span class='hs-varid'>getSlice</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-varid'>from</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>to</span><span class='hs-layout'>)</span>
<a name="line-89"></a>
<a name="line-90"></a><a name="getChanges'"></a><span class='hs-definition'>getChanges'</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>PArray</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>PArray</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-91"></a> <span class='hs-keyglyph'>-></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-keyglyph'>[</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-92"></a><span class='hs-definition'>getChanges'</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>abounds</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>bbounds</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-93"></a> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>convertPatch</span> <span class='hs-num'>0</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>createPatch</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>c_b</span>
<a name="line-94"></a> <span class='hs-keyword'>where</span>
<a name="line-95"></a> <span class='hs-comment'>-- If the last few characters of two lines are the same, the lines are</span>
<a name="line-96"></a> <span class='hs-comment'>-- probably the same. The choice of 20 is plucked out of the air.</span>
<a name="line-97"></a> <span class='hs-varid'>toHash</span> <span class='hs-varid'>x</span> <span class='hs-varid'>bnds</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>listArray</span> <span class='hs-varid'>bnds</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>hashPS</span> <span class='hs-varop'>$</span> <span class='hs-varid'>x</span><span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>range</span> <span class='hs-varid'>bnds</span><span class='hs-keyglyph'>]</span>
<a name="line-98"></a> <span class='hs-varid'>ah</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toHash</span> <span class='hs-varid'>a</span> <span class='hs-varid'>abounds</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HArray</span>
<a name="line-99"></a> <span class='hs-varid'>mkAMap</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-conop'>:</span><span class='hs-varid'>is</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-100"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>ins</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-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-varid'>new</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>collision</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-varid'>old</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-101"></a> <span class='hs-layout'>(</span><span class='hs-varid'>collision</span> <span class='hs-varop'>||</span> <span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-varid'>new</span> <span class='hs-varop'>==</span> <span class='hs-varid'>old</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>True</span><span class='hs-layout'>,</span> <span class='hs-conid'>False</span><span class='hs-layout'>,</span> <span class='hs-varid'>old</span><span class='hs-layout'>)</span>
<a name="line-102"></a> <span class='hs-varid'>m'</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>insertWith</span> <span class='hs-varid'>ins</span> <span class='hs-layout'>(</span><span class='hs-varid'>ah</span><span class='hs-varop'>!</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>False</span><span class='hs-layout'>,</span> <span class='hs-conid'>True</span><span class='hs-layout'>,</span> <span class='hs-conid'>False</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-varop'>!</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span>
<a name="line-103"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>mkAMap</span> <span class='hs-varid'>m'</span> <span class='hs-varid'>is</span>
<a name="line-104"></a> <span class='hs-varid'>mkAMap</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>m</span>
<a name="line-105"></a> <span class='hs-varid'>hm_a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkAMap</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span> <span class='hs-layout'>(</span><span class='hs-varid'>range</span> <span class='hs-varid'>abounds</span><span class='hs-layout'>)</span>
<a name="line-106"></a> <span class='hs-comment'>--</span>
<a name="line-107"></a> <span class='hs-varid'>bh</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toHash</span> <span class='hs-varid'>b</span> <span class='hs-varid'>bbounds</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HArray</span>
<a name="line-108"></a> <span class='hs-varid'>mkBMap</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-conop'>:</span><span class='hs-varid'>is</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-109"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>ins</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-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-varid'>new</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>collision</span><span class='hs-layout'>,</span><span class='hs-varid'>in_a</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-varid'>old</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-110"></a> <span class='hs-layout'>(</span><span class='hs-varid'>collision</span> <span class='hs-varop'>||</span> <span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-varid'>new</span> <span class='hs-varop'>==</span> <span class='hs-varid'>old</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>in_a</span><span class='hs-layout'>,</span> <span class='hs-conid'>True</span><span class='hs-layout'>,</span> <span class='hs-varid'>old</span><span class='hs-layout'>)</span>
<a name="line-111"></a> <span class='hs-varid'>m'</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>insertWith</span> <span class='hs-varid'>ins</span> <span class='hs-layout'>(</span><span class='hs-varid'>bh</span><span class='hs-varop'>!</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>False</span><span class='hs-layout'>,</span> <span class='hs-conid'>False</span><span class='hs-layout'>,</span> <span class='hs-conid'>True</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-varop'>!</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span>
<a name="line-112"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>mkBMap</span> <span class='hs-varid'>m'</span> <span class='hs-varid'>is</span>
<a name="line-113"></a> <span class='hs-varid'>mkBMap</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>m</span>
<a name="line-114"></a> <span class='hs-varid'>hm</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkBMap</span> <span class='hs-varid'>hm_a</span> <span class='hs-layout'>(</span><span class='hs-varid'>range</span> <span class='hs-varid'>bbounds</span><span class='hs-layout'>)</span>
<a name="line-115"></a> <span class='hs-comment'>-- take care of collisions, if there are different lines with the</span>
<a name="line-116"></a> <span class='hs-comment'>-- same hash in both files, then set the hash to markColl,</span>
<a name="line-117"></a> <span class='hs-comment'>-- PackedStrings are compared for two lines with the hash markColl</span>
<a name="line-118"></a> <span class='hs-varid'>get</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-layout'>,</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>h</span> <span class='hs-varid'>hm</span> <span class='hs-keyword'>of</span>
<a name="line-119"></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-conid'>False</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-conid'>Nothing</span>
<a name="line-120"></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-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-conid'>False</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'>Nothing</span>
<a name="line-121"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>False</span><span class='hs-layout'>,</span><span class='hs-conid'>True</span><span class='hs-layout'>,</span><span class='hs-conid'>True</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'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-layout'>,</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span>
<a name="line-122"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>True</span><span class='hs-layout'>,</span><span class='hs-conid'>True</span><span class='hs-layout'>,</span><span class='hs-conid'>True</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'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-layout'>,</span> <span class='hs-varid'>markColl</span><span class='hs-layout'>)</span>
<a name="line-123"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>impossible</span>
<a name="line-124"></a>
<a name="line-125"></a> <span class='hs-varid'>a'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>catMaybes</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>get</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-layout'>,</span> <span class='hs-varid'>ah</span><span class='hs-varop'>!</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>range</span> <span class='hs-layout'>(</span><span class='hs-varid'>bounds</span> <span class='hs-varid'>ah</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-126"></a> <span class='hs-varid'>b'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>catMaybes</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>get</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-varid'>bh</span><span class='hs-varop'>!</span><span class='hs-varid'>i</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-varid'>range</span> <span class='hs-layout'>(</span><span class='hs-varid'>bounds</span> <span class='hs-varid'>bh</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-127"></a>
<a name="line-128"></a> <span class='hs-layout'>(</span><span class='hs-varid'>c_a</span><span class='hs-layout'>,</span> <span class='hs-varid'>c_b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>diffArr</span> <span class='hs-varid'>a'</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-varid'>abounds</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>bbounds</span><span class='hs-layout'>)</span>
<a name="line-129"></a>
<a name="line-130"></a><a name="markColl"></a><span class='hs-comment'>-- | mark hash value where collision occured</span>
<a name="line-131"></a><span class='hs-definition'>markColl</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int32</span>
<a name="line-132"></a><span class='hs-definition'>markColl</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>2345677</span>
<a name="line-133"></a>
<a name="line-134"></a><a name="diffArr"></a><span class='hs-comment'>-- | return arrays with changes in a and b (1 indexed), offsets start with 0</span>
<a name="line-135"></a><span class='hs-definition'>diffArr</span> <span class='hs-keyglyph'>::</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'>Int32</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></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'>Int32</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-136"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>PArray</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>PArray</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-137"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>BArray</span><span class='hs-layout'>,</span> <span class='hs-conid'>BArray</span><span class='hs-layout'>)</span>
<a name="line-138"></a><span class='hs-definition'>diffArr</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-varid'>p_a</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>off_a</span><span class='hs-layout'>,</span> <span class='hs-varid'>l_a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>p_b</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>off_b</span><span class='hs-layout'>,</span> <span class='hs-varid'>l_b</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>runST</span> <span class='hs-layout'>(</span>
<a name="line-139"></a> <span class='hs-keyword'>do</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>h_a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>initH</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>snd</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-140"></a> <span class='hs-varid'>h_b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>initH</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>snd</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-141"></a> <span class='hs-varid'>m_a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>initM</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>fst</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-142"></a> <span class='hs-varid'>m_b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>initM</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>fst</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-143"></a> <span class='hs-varid'>end_a</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>aLen</span> <span class='hs-varid'>p_a</span><span class='hs-layout'>)</span>
<a name="line-144"></a> <span class='hs-varid'>end_b</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>aLen</span> <span class='hs-varid'>p_b</span><span class='hs-layout'>)</span>
<a name="line-145"></a> <span class='hs-varid'>c_a</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>initVChanged</span> <span class='hs-varid'>end_a</span>
<a name="line-146"></a> <span class='hs-varid'>c_b</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>initVChanged</span> <span class='hs-varid'>end_b</span>
<a name="line-147"></a> <span class='hs-varid'>mapM_</span> <span class='hs-layout'>(</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-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>l</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>a</span>
<a name="line-148"></a> <span class='hs-varid'>mapM_</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>c_b</span> <span class='hs-varid'>l</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>b</span>
<a name="line-149"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>cmpseq</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>c_b</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-layout'>(</span><span class='hs-varid'>aLen</span> <span class='hs-varid'>h_a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>aLen</span> <span class='hs-varid'>h_b</span><span class='hs-layout'>)</span>
<a name="line-150"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>unchanged</span> <span class='hs-varid'>ar</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span><span class='hs-varid'>xs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getElems</span> <span class='hs-varid'>ar</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-varop'>$</span> <span class='hs-varid'>filter</span> <span class='hs-varid'>not</span> <span class='hs-varop'>$</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>}</span>
<a name="line-151"></a> <span class='hs-varid'>err</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>liftM2</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>unchanged</span> <span class='hs-varid'>c_a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>unchanged</span> <span class='hs-varid'>c_b</span><span class='hs-layout'>)</span>
<a name="line-152"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>err</span><span class='hs-layout'>)</span> <span class='hs-varid'>impossible</span>
<a name="line-153"></a> <span class='hs-comment'>-- Mark common lines at beginning and end</span>
<a name="line-154"></a> <span class='hs-varid'>mapM_</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>i</span> <span class='hs-conid'>False</span> <span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>1</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>(</span><span class='hs-varid'>off_a</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-155"></a> <span class='hs-varid'>mapM_</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-varid'>writeArray</span> <span class='hs-varid'>c_b</span> <span class='hs-varid'>i</span> <span class='hs-conid'>False</span> <span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>1</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>(</span><span class='hs-varid'>off_b</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-156"></a> <span class='hs-varid'>mapM_</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>i</span> <span class='hs-conid'>False</span> <span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>l_a</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>..</span> <span class='hs-layout'>(</span><span class='hs-varid'>end_a</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-157"></a> <span class='hs-varid'>mapM_</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-varid'>writeArray</span> <span class='hs-varid'>c_b</span> <span class='hs-varid'>i</span> <span class='hs-conid'>False</span> <span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>l_b</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>..</span> <span class='hs-layout'>(</span><span class='hs-varid'>end_b</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-158"></a> <span class='hs-varid'>shiftBoundaries</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>c_b</span> <span class='hs-varid'>p_a</span> <span class='hs-num'>1</span> <span class='hs-num'>1</span>
<a name="line-159"></a> <span class='hs-varid'>shiftBoundaries</span> <span class='hs-varid'>c_b</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>p_b</span> <span class='hs-num'>1</span> <span class='hs-num'>1</span>
<a name="line-160"></a> <span class='hs-varid'>err1</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>liftM2</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'>unchanged</span> <span class='hs-varid'>c_a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>unchanged</span> <span class='hs-varid'>c_b</span><span class='hs-layout'>)</span>
<a name="line-161"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>err1</span><span class='hs-layout'>)</span> <span class='hs-varid'>impossible</span>
<a name="line-162"></a> <span class='hs-varid'>c_a'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unsafeFreeze</span> <span class='hs-varid'>c_a</span>
<a name="line-163"></a> <span class='hs-varid'>c_b'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unsafeFreeze</span> <span class='hs-varid'>c_b</span>
<a name="line-164"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>c_a'</span><span class='hs-layout'>,</span> <span class='hs-varid'>c_b'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-165"></a>
<a name="line-166"></a><a name="cmpseq"></a><span class='hs-comment'>-- | set changes array for a and b and return number of changed lines</span>
<a name="line-167"></a><span class='hs-definition'>cmpseq</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MapArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MapArray</span>
<a name="line-168"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>BSTArray</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>BSTArray</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</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-conid'>Int</span>
<a name="line-169"></a><span class='hs-definition'>cmpseq</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>return</span> <span class='hs-num'>0</span>
<a name="line-170"></a><span class='hs-definition'>cmpseq</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>c_b</span> <span class='hs-varid'>off_a</span> <span class='hs-varid'>off_b</span> <span class='hs-varid'>l_a</span> <span class='hs-varid'>l_b</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-171"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>lim_a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>off_a</span><span class='hs-varop'>+</span><span class='hs-varid'>l_a</span>
<a name="line-172"></a> <span class='hs-varid'>lim_b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>off_b</span><span class='hs-varop'>+</span><span class='hs-varid'>l_b</span>
<a name="line-173"></a> <span class='hs-varid'>off_a'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>findSnake</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-varid'>off_a</span> <span class='hs-varid'>off_b</span> <span class='hs-varid'>l_a</span> <span class='hs-varid'>l_b</span> <span class='hs-varid'>off_a</span> <span class='hs-varid'>off_b</span>
<a name="line-174"></a> <span class='hs-varid'>off_b'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>off_b</span><span class='hs-varop'>+</span><span class='hs-varid'>off_a'</span><span class='hs-comment'>-</span><span class='hs-varid'>off_a</span>
<a name="line-175"></a> <span class='hs-varid'>lim_a'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>findSnakeRev</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-varid'>lim_a</span> <span class='hs-varid'>lim_b</span> <span class='hs-varid'>off_a'</span> <span class='hs-varid'>off_b'</span>
<a name="line-176"></a> <span class='hs-varid'>lim_b'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lim_b</span><span class='hs-varop'>+</span><span class='hs-varid'>lim_a'</span><span class='hs-comment'>-</span><span class='hs-varid'>lim_a</span>
<a name="line-177"></a> <span class='hs-varid'>l_a'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lim_a'</span><span class='hs-comment'>-</span><span class='hs-varid'>off_a'</span>
<a name="line-178"></a> <span class='hs-varid'>l_b'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lim_b'</span><span class='hs-comment'>-</span><span class='hs-varid'>off_b'</span>
<a name="line-179"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>l_a'</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span> <span class='hs-varop'>||</span> <span class='hs-varid'>l_b'</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span>
<a name="line-180"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>l_a'</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span>
<a name="line-181"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>l_b'</span> <span class='hs-varop'>></span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-182"></a> <span class='hs-varid'>mapM_</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-varid'>writeArray</span> <span class='hs-varid'>c_b</span> <span class='hs-layout'>(</span><span class='hs-varid'>m_b</span><span class='hs-varop'>!</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-conid'>True</span><span class='hs-layout'>)</span>
<a name="line-183"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>off_b'</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>..</span> <span class='hs-varid'>lim_b'</span><span class='hs-keyglyph'>]</span>
<a name="line-184"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>l_b'</span>
<a name="line-185"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>l_a'</span> <span class='hs-varop'>></span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-186"></a> <span class='hs-varid'>mapM_</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>i</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>c_a</span> <span class='hs-layout'>(</span><span class='hs-varid'>m_a</span><span class='hs-varop'>!</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-conid'>True</span><span class='hs-layout'>)</span>
<a name="line-187"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>off_a'</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>..</span> <span class='hs-varid'>lim_a'</span><span class='hs-keyglyph'>]</span>
<a name="line-188"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>l_a'</span>
<a name="line-189"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l_a'</span> <span class='hs-varop'>+</span> <span class='hs-varid'>l_b'</span>
<a name="line-190"></a> <span class='hs-varid'>del</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l_a'</span> <span class='hs-comment'>-</span> <span class='hs-varid'>l_b'</span>
<a name="line-191"></a> <span class='hs-varid'>dodd</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>odd</span> <span class='hs-varop'>$</span> <span class='hs-varid'>del</span>
<a name="line-192"></a> <span class='hs-varid'>v</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>initV</span> <span class='hs-varid'>m</span>
<a name="line-193"></a> <span class='hs-varid'>vrev</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>initVRev</span> <span class='hs-varid'>m</span> <span class='hs-varid'>l_a'</span>
<a name="line-194"></a> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>vrev</span> <span class='hs-num'>0</span> <span class='hs-varid'>l_a'</span>
<a name="line-195"></a> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>v</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span>
<a name="line-196"></a> <span class='hs-layout'>(</span><span class='hs-varid'>xmid</span><span class='hs-layout'>,</span> <span class='hs-varid'>ymid</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'>findDiag</span> <span class='hs-num'>1</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-varid'>v</span> <span class='hs-varid'>vrev</span>
<a name="line-197"></a> <span class='hs-varid'>off_a'</span> <span class='hs-varid'>off_b'</span> <span class='hs-varid'>l_a'</span> <span class='hs-varid'>l_b'</span> <span class='hs-varid'>del</span> <span class='hs-varid'>dodd</span>
<a name="line-198"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>xmid</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>ymid</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-varop'>||</span> <span class='hs-layout'>(</span><span class='hs-varid'>xmid</span> <span class='hs-varop'>==</span> <span class='hs-varid'>l_a'</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>ymid</span> <span class='hs-varop'>==</span> <span class='hs-varid'>l_b'</span><span class='hs-layout'>)</span>
<a name="line-199"></a> <span class='hs-varop'>||</span> <span class='hs-layout'>(</span><span class='hs-varid'>xmid</span> <span class='hs-varop'><</span> <span class='hs-num'>0</span> <span class='hs-varop'>||</span> <span class='hs-varid'>ymid</span> <span class='hs-varop'><</span> <span class='hs-num'>0</span> <span class='hs-varop'>||</span> <span class='hs-varid'>xmid</span> <span class='hs-varop'>></span> <span class='hs-varid'>l_a'</span> <span class='hs-varop'>||</span> <span class='hs-varid'>ymid</span> <span class='hs-varop'>></span> <span class='hs-varid'>l_b'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-200"></a> <span class='hs-varid'>impossible</span>
<a name="line-201"></a> <span class='hs-varid'>c1</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>cmpseq</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>c_b</span>
<a name="line-202"></a> <span class='hs-varid'>off_a'</span> <span class='hs-varid'>off_b'</span> <span class='hs-varid'>xmid</span> <span class='hs-varid'>ymid</span>
<a name="line-203"></a> <span class='hs-varid'>c2</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>cmpseq</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>c_b</span>
<a name="line-204"></a> <span class='hs-layout'>(</span><span class='hs-varid'>off_a'</span> <span class='hs-varop'>+</span> <span class='hs-varid'>xmid</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>off_b'</span> <span class='hs-varop'>+</span> <span class='hs-varid'>ymid</span><span class='hs-layout'>)</span>
<a name="line-205"></a> <span class='hs-layout'>(</span><span class='hs-varid'>l_a'</span> <span class='hs-comment'>-</span> <span class='hs-varid'>xmid</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>l_b'</span> <span class='hs-comment'>-</span> <span class='hs-varid'>ymid</span><span class='hs-layout'>)</span>
<a name="line-206"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>c1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>c2</span>
<a name="line-207"></a>
<a name="line-208"></a><a name="findDiag"></a><span class='hs-comment'>-- | return (xmid, ymid, cost) for the two substrings</span>
<a name="line-209"></a><span class='hs-comment'>-- a[off_a+1..off_a+1+l_a] and b</span>
<a name="line-210"></a><span class='hs-definition'>findDiag</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MapArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MapArray</span>
<a name="line-211"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>VSTArray</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>VSTArray</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-212"></a> <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'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-213"></a><span class='hs-definition'>findDiag</span> <span class='hs-varid'>c</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-varid'>v</span> <span class='hs-varid'>vrev</span> <span class='hs-varid'>off_a</span> <span class='hs-varid'>off_b</span> <span class='hs-varid'>l_a</span> <span class='hs-varid'>l_b</span> <span class='hs-varid'>del</span> <span class='hs-varid'>dodd</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-214"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>c</span> <span class='hs-varop'>></span> <span class='hs-varid'>l_a</span> <span class='hs-varop'>+</span> <span class='hs-varid'>l_b</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>error</span> <span class='hs-str'>"findDiag failed"</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-215"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>findF</span>
<a name="line-216"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-217"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>xmid</span><span class='hs-layout'>,</span> <span class='hs-varid'>ymid</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>xmid</span><span class='hs-layout'>,</span> <span class='hs-varid'>ymid</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-varop'>*</span><span class='hs-num'>2</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-218"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span>
<a name="line-219"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>r'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>findR</span>
<a name="line-220"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>r'</span> <span class='hs-keyword'>of</span>
<a name="line-221"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>xmid</span><span class='hs-layout'>,</span> <span class='hs-varid'>ymid</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>xmid</span><span class='hs-layout'>,</span> <span class='hs-varid'>ymid</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-varop'>*</span><span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-222"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>findDiag</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-varid'>v</span> <span class='hs-varid'>vrev</span>
<a name="line-223"></a> <span class='hs-varid'>off_a</span> <span class='hs-varid'>off_b</span> <span class='hs-varid'>l_a</span> <span class='hs-varid'>l_b</span> <span class='hs-varid'>del</span> <span class='hs-varid'>dodd</span>
<a name="line-224"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>fdmax</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>c</span> <span class='hs-varop'><=</span> <span class='hs-varid'>l_a</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>l_a</span> <span class='hs-comment'>-</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>l_a</span> <span class='hs-varop'>+</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varop'>`mod`</span> <span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-225"></a> <span class='hs-varid'>rdmax</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>c</span> <span class='hs-varop'><=</span> <span class='hs-varid'>l_b</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>l_b</span> <span class='hs-comment'>-</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>l_b</span> <span class='hs-varop'>+</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varop'>`mod`</span> <span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-226"></a> <span class='hs-varid'>lastrdmax</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'><=</span> <span class='hs-varid'>l_b</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>c</span><span class='hs-comment'>-</span><span class='hs-num'>1</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>l_b</span><span class='hs-comment'>-</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>l_b</span> <span class='hs-varop'>+</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>`mod`</span> <span class='hs-num'>2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-227"></a> <span class='hs-varid'>lastrdmin</span> <span class='hs-keyglyph'>=</span> <span class='hs-comment'>-</span><span class='hs-layout'>(</span><span class='hs-keyword'>if</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'><=</span> <span class='hs-varid'>l_a</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>c</span><span class='hs-comment'>-</span><span class='hs-num'>1</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>l_a</span><span class='hs-comment'>-</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>l_a</span> <span class='hs-varop'>+</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>`mod`</span> <span class='hs-num'>2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-228"></a> <span class='hs-varid'>fdmin</span> <span class='hs-keyglyph'>=</span> <span class='hs-comment'>-</span><span class='hs-varid'>rdmax</span>
<a name="line-229"></a> <span class='hs-varid'>rdmin</span> <span class='hs-keyglyph'>=</span> <span class='hs-comment'>-</span><span class='hs-varid'>fdmax</span>
<a name="line-230"></a> <span class='hs-varid'>findF</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>findF'</span> <span class='hs-varid'>fdmax</span>
<a name="line-231"></a> <span class='hs-varid'>findR</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>findR'</span> <span class='hs-varid'>rdmax</span>
<a name="line-232"></a> <span class='hs-varid'>findF'</span> <span class='hs-varid'>d</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'>findOne</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-varid'>v</span> <span class='hs-varid'>d</span> <span class='hs-varid'>off_a</span> <span class='hs-varid'>off_b</span> <span class='hs-varid'>l_a</span> <span class='hs-varid'>l_b</span>
<a name="line-233"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>dodd</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>d</span> <span class='hs-comment'>-</span> <span class='hs-varid'>del</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>lastrdmin</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>d</span> <span class='hs-comment'>-</span> <span class='hs-varid'>del</span> <span class='hs-varop'><=</span> <span class='hs-varid'>lastrdmax</span>
<a name="line-234"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>xr</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>vrev</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-comment'>-</span> <span class='hs-varid'>del</span><span class='hs-layout'>)</span>
<a name="line-235"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>xr</span> <span class='hs-varop'><=</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</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-comment'>-</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-236"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>d</span> <span class='hs-varop'><=</span> <span class='hs-varid'>fdmin</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-237"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>findF'</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-comment'>-</span><span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-238"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>d</span> <span class='hs-varop'><=</span> <span class='hs-varid'>fdmin</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>findF'</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-comment'>-</span><span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-239"></a> <span class='hs-varid'>findR'</span> <span class='hs-varid'>d</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'>findOneRev</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-varid'>vrev</span> <span class='hs-varid'>d</span> <span class='hs-varid'>del</span> <span class='hs-varid'>off_a</span> <span class='hs-varid'>off_b</span>
<a name="line-240"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>not</span> <span class='hs-varid'>dodd</span> <span class='hs-varop'>&&</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-varop'>+</span> <span class='hs-varid'>del</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>fdmin</span><span class='hs-layout'>)</span> <span class='hs-varop'>&&</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-varop'>+</span> <span class='hs-varid'>del</span> <span class='hs-varop'><=</span> <span class='hs-varid'>fdmax</span><span class='hs-layout'>)</span>
<a name="line-241"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>xf</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>v</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-varop'>+</span> <span class='hs-varid'>del</span><span class='hs-layout'>)</span>
<a name="line-242"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>x</span> <span class='hs-varop'><=</span> <span class='hs-varid'>xf</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</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-comment'>-</span><span class='hs-varid'>del</span><span class='hs-comment'>-</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-243"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>d</span> <span class='hs-varop'><=</span> <span class='hs-varid'>rdmin</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-244"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>findR'</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-comment'>-</span><span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-245"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>d</span> <span class='hs-varop'><=</span> <span class='hs-varid'>rdmin</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>findR'</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-comment'>-</span><span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-246"></a>
<a name="line-247"></a><a name="findOne"></a><span class='hs-comment'>-- | find position on diag d with one more insert/delete going forward</span>
<a name="line-248"></a><span class='hs-definition'>findOne</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MapArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MapArray</span>
<a name="line-249"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>VSTArray</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</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-conid'>Int</span>
<a name="line-250"></a><span class='hs-definition'>findOne</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-varid'>v</span> <span class='hs-varid'>d</span> <span class='hs-varid'>off_a</span> <span class='hs-varid'>off_b</span> <span class='hs-varid'>l_a</span> <span class='hs-varid'>l_b</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-251"></a> <span class='hs-varid'>x0</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>xbelow</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>v</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-252"></a> <span class='hs-varid'>xover</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>v</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-253"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>xover</span> <span class='hs-varop'>></span> <span class='hs-varid'>xbelow</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>xover</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>xbelow</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span>
<a name="line-254"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>y0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x0</span> <span class='hs-comment'>-</span> <span class='hs-varid'>d</span>
<a name="line-255"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>findSnake</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-layout'>(</span><span class='hs-varid'>x0</span><span class='hs-varop'>+</span><span class='hs-varid'>off_a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>y0</span><span class='hs-varop'>+</span><span class='hs-varid'>off_b</span><span class='hs-layout'>)</span>
<a name="line-256"></a> <span class='hs-varid'>l_a</span> <span class='hs-varid'>l_b</span> <span class='hs-varid'>off_a</span> <span class='hs-varid'>off_b</span>
<a name="line-257"></a> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>v</span> <span class='hs-varid'>d</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-comment'>-</span> <span class='hs-varid'>off_a</span><span class='hs-layout'>)</span>
<a name="line-258"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-comment'>-</span><span class='hs-varid'>off_a</span><span class='hs-layout'>)</span>
<a name="line-259"></a>
<a name="line-260"></a><a name="findSnake"></a><span class='hs-comment'>-- | follow snake from northwest to southeast, x and y are absolute positions</span>
<a name="line-261"></a><span class='hs-definition'>findSnake</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MapArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MapArray</span>
<a name="line-262"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-263"></a><span class='hs-definition'>findSnake</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>l_a</span> <span class='hs-varid'>l_b</span> <span class='hs-varid'>off_a</span> <span class='hs-varid'>off_b</span> <span class='hs-keyglyph'>=</span>
<a name="line-264"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>x</span> <span class='hs-varop'><</span> <span class='hs-varid'>l_a</span> <span class='hs-varop'>+</span> <span class='hs-varid'>off_a</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>y</span> <span class='hs-varop'><</span> <span class='hs-varid'>l_b</span> <span class='hs-varop'>+</span> <span class='hs-varid'>off_b</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>h_a</span><span class='hs-varop'>!</span><span class='hs-layout'>(</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'>h_b</span><span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-265"></a> <span class='hs-varop'>&&</span> <span class='hs-layout'>(</span><span class='hs-varid'>h_a</span><span class='hs-varop'>!</span><span class='hs-layout'>(</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'>markColl</span> <span class='hs-varop'>||</span> <span class='hs-varid'>p_a</span><span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-varid'>m_a</span><span class='hs-varop'>!</span><span class='hs-layout'>(</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-layout'>)</span> <span class='hs-varop'>==</span> <span class='hs-varid'>p_b</span><span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-varid'>m_b</span><span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-266"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>findSnake</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-layout'>(</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-layout'>(</span><span class='hs-varid'>y</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>l_a</span> <span class='hs-varid'>l_b</span> <span class='hs-varid'>off_a</span> <span class='hs-varid'>off_b</span>
<a name="line-267"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>x</span>
<a name="line-268"></a>
<a name="line-269"></a><a name="findOneRev"></a><span class='hs-comment'>-- | find position on diag d with one more insert/delete going backward</span>
<a name="line-270"></a><span class='hs-definition'>findOneRev</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MapArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MapArray</span>
<a name="line-271"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>VSTArray</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</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-conid'>Int</span>
<a name="line-272"></a><span class='hs-definition'>findOneRev</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-varid'>v</span> <span class='hs-varid'>d</span> <span class='hs-varid'>del</span> <span class='hs-varid'>off_a</span> <span class='hs-varid'>off_b</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-273"></a> <span class='hs-varid'>x0</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>xbelow</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>v</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-274"></a> <span class='hs-varid'>xover</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>v</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-275"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>xbelow</span> <span class='hs-varop'><</span> <span class='hs-varid'>xover</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>xbelow</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>xover</span><span class='hs-comment'>-</span><span class='hs-num'>1</span>
<a name="line-276"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>y0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x0</span> <span class='hs-comment'>-</span> <span class='hs-varid'>del</span> <span class='hs-comment'>-</span> <span class='hs-varid'>d</span>
<a name="line-277"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>findSnakeRev</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-layout'>(</span><span class='hs-varid'>x0</span><span class='hs-varop'>+</span><span class='hs-varid'>off_a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>y0</span><span class='hs-varop'>+</span><span class='hs-varid'>off_b</span><span class='hs-layout'>)</span>
<a name="line-278"></a> <span class='hs-varid'>off_a</span> <span class='hs-varid'>off_b</span>
<a name="line-279"></a> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>v</span> <span class='hs-varid'>d</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-comment'>-</span><span class='hs-varid'>off_a</span><span class='hs-layout'>)</span>
<a name="line-280"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-comment'>-</span><span class='hs-varid'>off_a</span><span class='hs-layout'>)</span>
<a name="line-281"></a>
<a name="line-282"></a><a name="findSnakeRev"></a><span class='hs-comment'>-- | follow snake from southeast to northwest, x and y are absolute positions</span>
<a name="line-283"></a><span class='hs-definition'>findSnakeRev</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MapArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MapArray</span>
<a name="line-284"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-285"></a><span class='hs-definition'>findSnakeRev</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>off_a</span> <span class='hs-varid'>off_b</span> <span class='hs-keyglyph'>=</span>
<a name="line-286"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>x</span> <span class='hs-varop'>></span> <span class='hs-varid'>off_a</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>y</span> <span class='hs-varop'>></span> <span class='hs-varid'>off_b</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>h_a</span><span class='hs-varop'>!</span><span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>h_b</span><span class='hs-varop'>!</span><span class='hs-varid'>y</span>
<a name="line-287"></a> <span class='hs-varop'>&&</span> <span class='hs-layout'>(</span><span class='hs-varid'>h_a</span><span class='hs-varop'>!</span><span class='hs-varid'>x</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>markColl</span> <span class='hs-varop'>||</span> <span class='hs-varid'>p_a</span><span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-varid'>m_a</span><span class='hs-varop'>!</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varop'>==</span> <span class='hs-varid'>p_b</span><span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-varid'>m_b</span><span class='hs-varop'>!</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-288"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>findSnakeRev</span> <span class='hs-varid'>h_a</span> <span class='hs-varid'>h_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>p_b</span> <span class='hs-varid'>m_a</span> <span class='hs-varid'>m_b</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>y</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>off_a</span> <span class='hs-varid'>off_b</span>
<a name="line-289"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>x</span>
<a name="line-290"></a>
<a name="line-291"></a><a name="shiftBoundaries"></a><span class='hs-comment'>-- | try to create nicer diffs by shifting around regions of changed lines</span>
<a name="line-292"></a><span class='hs-definition'>shiftBoundaries</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BSTArray</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>BSTArray</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</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-conid'>()</span>
<a name="line-293"></a><span class='hs-definition'>shiftBoundaries</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>c_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>i_</span> <span class='hs-varid'>j_</span> <span class='hs-keyglyph'>=</span>
<a name="line-294"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>nextChanged</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>i_</span>
<a name="line-295"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-296"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>start</span> <span class='hs-keyglyph'>-></span>
<a name="line-297"></a> <span class='hs-keyword'>do</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>skipped</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>start</span> <span class='hs-comment'>-</span> <span class='hs-varid'>i_</span>
<a name="line-298"></a> <span class='hs-varid'>j1</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>nextUnchangedN</span> <span class='hs-varid'>c_b</span> <span class='hs-varid'>skipped</span> <span class='hs-varid'>j_</span>
<a name="line-299"></a> <span class='hs-varid'>end</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>nextUnchanged</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>start</span>
<a name="line-300"></a> <span class='hs-varid'>j2</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>nextUnchanged</span> <span class='hs-varid'>c_b</span> <span class='hs-varid'>j1</span>
<a name="line-301"></a> <span class='hs-layout'>(</span><span class='hs-varid'>i3</span><span class='hs-layout'>,</span><span class='hs-varid'>j3</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>expand</span> <span class='hs-varid'>start</span> <span class='hs-varid'>end</span> <span class='hs-varid'>j2</span>
<a name="line-302"></a> <span class='hs-varid'>shiftBoundaries</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>c_b</span> <span class='hs-varid'>p_a</span> <span class='hs-varid'>i3</span> <span class='hs-varid'>j3</span>
<a name="line-303"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span> <span class='hs-comment'>-- no change up to end of file</span>
<a name="line-304"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>noline</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>aLen</span> <span class='hs-varid'>p_a</span><span class='hs-layout'>)</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span>
<a name="line-305"></a> <span class='hs-varid'>expand</span> <span class='hs-varid'>start</span> <span class='hs-varid'>i</span> <span class='hs-varid'>j</span> <span class='hs-keyglyph'>=</span>
<a name="line-306"></a> <span class='hs-keyword'>do</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i</span> <span class='hs-comment'>-</span> <span class='hs-varid'>start</span>
<a name="line-307"></a> <span class='hs-layout'>(</span><span class='hs-varid'>start0</span><span class='hs-layout'>,</span><span class='hs-varid'>i0</span><span class='hs-layout'>,</span><span class='hs-varid'>j0</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>shiftBackward</span> <span class='hs-varid'>start</span> <span class='hs-varid'>i</span> <span class='hs-varid'>j</span>
<a name="line-308"></a> <span class='hs-varid'>b</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>j0</span> <span class='hs-varop'>></span> <span class='hs-num'>1</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>c_b</span> <span class='hs-layout'>(</span><span class='hs-varid'>j0</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span>
<a name="line-309"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>corr</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>i0</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>noline</span>
<a name="line-310"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>blank</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>p_a</span><span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-varid'>i0</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>==</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>i0</span>
<a name="line-311"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>noline</span>
<a name="line-312"></a> <span class='hs-layout'>(</span><span class='hs-varid'>start1</span><span class='hs-layout'>,</span><span class='hs-varid'>i1</span><span class='hs-layout'>,</span><span class='hs-varid'>j1</span><span class='hs-layout'>,</span><span class='hs-varid'>corr1</span><span class='hs-layout'>,</span><span class='hs-varid'>blank1</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>shiftForward</span> <span class='hs-varid'>start0</span> <span class='hs-varid'>i0</span> <span class='hs-varid'>j0</span> <span class='hs-varid'>corr</span> <span class='hs-varid'>blank</span>
<a name="line-313"></a> <span class='hs-comment'>-- prefer corresponding to ending with blank line</span>
<a name="line-314"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>newi</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>corr1</span> <span class='hs-varop'>==</span> <span class='hs-varid'>noline</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>blank1</span>
<a name="line-315"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>corr1</span>
<a name="line-316"></a> <span class='hs-layout'>(</span><span class='hs-varid'>start2</span><span class='hs-layout'>,</span><span class='hs-varid'>i2</span><span class='hs-layout'>,</span><span class='hs-varid'>j2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>moveCorr</span> <span class='hs-varid'>start1</span> <span class='hs-varid'>i1</span> <span class='hs-varid'>j1</span> <span class='hs-varid'>newi</span>
<a name="line-317"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>len</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>i2</span> <span class='hs-comment'>-</span> <span class='hs-varid'>start2</span>
<a name="line-318"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>expand</span> <span class='hs-varid'>start2</span> <span class='hs-varid'>i2</span> <span class='hs-varid'>j2</span>
<a name="line-319"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>i2</span><span class='hs-layout'>,</span> <span class='hs-varid'>j2</span><span class='hs-layout'>)</span>
<a name="line-320"></a> <span class='hs-varid'>shiftBackward</span> <span class='hs-varid'>start</span> <span class='hs-varid'>i</span> <span class='hs-varid'>j</span> <span class='hs-keyglyph'>=</span>
<a name="line-321"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>start</span> <span class='hs-varop'>></span> <span class='hs-num'>1</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>p_a</span><span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>==</span> <span class='hs-varid'>p_a</span><span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-322"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span> <span class='hs-varop'>==</span> <span class='hs-varid'>start</span><span class='hs-layout'>)</span> <span class='hs-varid'>impossible</span>
<a name="line-323"></a> <span class='hs-varid'>b1</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>c_a</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-324"></a> <span class='hs-varid'>b2</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>c_a</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-325"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varid'>b1</span><span class='hs-layout'>)</span> <span class='hs-varop'>||</span> <span class='hs-varid'>b2</span><span class='hs-layout'>)</span> <span class='hs-varid'>impossible</span>
<a name="line-326"></a> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>c_a</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-conid'>False</span>
<a name="line-327"></a> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>c_a</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-conid'>True</span>
<a name="line-328"></a> <span class='hs-varid'>b</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>start</span> <span class='hs-varop'>></span> <span class='hs-num'>2</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>c_a</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-comment'>-</span><span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-329"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span>
<a name="line-330"></a> <span class='hs-varid'>start'</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>liftM</span> <span class='hs-layout'>(</span><span class='hs-num'>1</span><span class='hs-varop'>+</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>prevUnchanged</span> <span class='hs-varid'>c_a</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-comment'>-</span><span class='hs-num'>2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-331"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-332"></a> <span class='hs-varid'>j'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>prevUnchanged</span> <span class='hs-varid'>c_b</span> <span class='hs-layout'>(</span><span class='hs-varid'>j</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-333"></a> <span class='hs-varid'>shiftBackward</span> <span class='hs-varid'>start'</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>j'</span>
<a name="line-334"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-layout'>,</span><span class='hs-varid'>i</span><span class='hs-layout'>,</span><span class='hs-varid'>j</span><span class='hs-layout'>)</span>
<a name="line-335"></a> <span class='hs-varid'>shiftForward</span> <span class='hs-varid'>start</span> <span class='hs-varid'>i</span> <span class='hs-varid'>j</span> <span class='hs-varid'>corr</span> <span class='hs-varid'>blank</span> <span class='hs-keyglyph'>=</span>
<a name="line-336"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>i</span> <span class='hs-varop'><=</span> <span class='hs-varid'>aLen</span> <span class='hs-varid'>p_a</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>p_a</span><span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-varop'>==</span> <span class='hs-varid'>p_a</span><span class='hs-varop'>!</span><span class='hs-varid'>start</span> <span class='hs-varop'>&&</span>
<a name="line-337"></a> <span class='hs-comment'>-- B.empty at the end of file marks empty line after final newline</span>
<a name="line-338"></a> <span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>i</span> <span class='hs-varop'>==</span> <span class='hs-varid'>aLen</span> <span class='hs-varid'>p_a</span><span class='hs-layout'>)</span> <span class='hs-varop'>&&</span> <span class='hs-layout'>(</span><span class='hs-varid'>p_a</span><span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-varop'>==</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-339"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span> <span class='hs-varop'>==</span> <span class='hs-varid'>start</span><span class='hs-layout'>)</span> <span class='hs-varid'>impossible</span>
<a name="line-340"></a> <span class='hs-varid'>b1</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>i</span>
<a name="line-341"></a> <span class='hs-varid'>b2</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>start</span>
<a name="line-342"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varid'>b2</span><span class='hs-layout'>)</span> <span class='hs-varop'>||</span> <span class='hs-varid'>b1</span><span class='hs-layout'>)</span> <span class='hs-varid'>impossible</span>
<a name="line-343"></a> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>i</span> <span class='hs-conid'>True</span>
<a name="line-344"></a> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>start</span> <span class='hs-conid'>False</span>
<a name="line-345"></a> <span class='hs-varid'>i0</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>nextUnchanged</span> <span class='hs-varid'>c_a</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-346"></a> <span class='hs-varid'>j0</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>nextUnchanged</span> <span class='hs-varid'>c_b</span> <span class='hs-layout'>(</span><span class='hs-varid'>j</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-347"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>corr0</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>i0</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-num'>1</span><span class='hs-layout'>)</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>noline</span>
<a name="line-348"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>j0</span><span class='hs-comment'>-</span><span class='hs-varid'>j</span> <span class='hs-varop'>></span> <span class='hs-num'>2</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>i0</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>corr</span>
<a name="line-349"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>blank0</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>i0</span> <span class='hs-varop'>></span> <span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>1</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>noline</span>
<a name="line-350"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>p_a</span><span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-varid'>i0</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>==</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>i0</span>
<a name="line-351"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>blank</span>
<a name="line-352"></a> <span class='hs-varid'>shiftForward</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>i0</span> <span class='hs-varid'>j0</span> <span class='hs-varid'>corr0</span> <span class='hs-varid'>blank0</span>
<a name="line-353"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-layout'>,</span><span class='hs-varid'>i</span><span class='hs-layout'>,</span><span class='hs-varid'>j</span><span class='hs-layout'>,</span><span class='hs-varid'>corr</span><span class='hs-layout'>,</span><span class='hs-varid'>blank</span><span class='hs-layout'>)</span>
<a name="line-354"></a> <span class='hs-varid'>moveCorr</span> <span class='hs-varid'>start</span> <span class='hs-varid'>i</span> <span class='hs-varid'>j</span> <span class='hs-varid'>corr</span> <span class='hs-keyglyph'>=</span>
<a name="line-355"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>corr</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>i</span>
<a name="line-356"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-layout'>,</span><span class='hs-varid'>i</span><span class='hs-layout'>,</span><span class='hs-varid'>j</span><span class='hs-layout'>)</span>
<a name="line-357"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>b1</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>c_a</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-358"></a> <span class='hs-varid'>b2</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>c_a</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-359"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varid'>b1</span><span class='hs-layout'>)</span> <span class='hs-varop'>||</span> <span class='hs-varid'>b2</span><span class='hs-layout'>)</span> <span class='hs-varid'>impossible</span>
<a name="line-360"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>p_a</span><span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>p_a</span><span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>impossible</span>
<a name="line-361"></a> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>c_a</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-conid'>False</span>
<a name="line-362"></a> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>c_a</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-conid'>True</span>
<a name="line-363"></a> <span class='hs-varid'>j'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>prevUnchanged</span> <span class='hs-varid'>c_b</span> <span class='hs-layout'>(</span><span class='hs-varid'>j</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-364"></a> <span class='hs-varid'>moveCorr</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>j'</span> <span class='hs-varid'>corr</span>
<a name="line-365"></a>
<a name="line-366"></a><a name="nextUnchanged"></a><span class='hs-comment'>-- | goto next unchanged line, return the given line if unchanged</span>
<a name="line-367"></a><span class='hs-definition'>nextUnchanged</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BSTArray</span> <span class='hs-varid'>s</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-conid'>Int</span>
<a name="line-368"></a><span class='hs-definition'>nextUnchanged</span> <span class='hs-varid'>c</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-369"></a> <span class='hs-varid'>len</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>aLenM</span> <span class='hs-varid'>c</span>
<a name="line-370"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>i</span> <span class='hs-varop'>==</span> <span class='hs-varid'>len</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-varid'>i</span>
<a name="line-371"></a> <span class='hs-keyword'>else</span> <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'>c</span> <span class='hs-varid'>i</span>
<a name="line-372"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>nextUnchanged</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-373"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-varid'>i</span>
<a name="line-374"></a>
<a name="line-375"></a><a name="skipOneUnChanged"></a><span class='hs-comment'>-- | skip at least one unchanged line, if there is none advance</span>
<a name="line-376"></a><span class='hs-comment'>-- behind the last line</span>
<a name="line-377"></a><span class='hs-definition'>skipOneUnChanged</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BSTArray</span> <span class='hs-varid'>s</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-conid'>Int</span>
<a name="line-378"></a><span class='hs-definition'>skipOneUnChanged</span> <span class='hs-varid'>c</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-379"></a> <span class='hs-varid'>len</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>aLenM</span> <span class='hs-varid'>c</span>
<a name="line-380"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>i</span> <span class='hs-varop'>==</span> <span class='hs-varid'>len</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span>
<a name="line-381"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-varid'>i</span>
<a name="line-382"></a> <span class='hs-keyword'>else</span> <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'>c</span> <span class='hs-varid'>i</span>
<a name="line-383"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>not</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-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-384"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>skipOneUnChanged</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-385"></a>
<a name="line-386"></a><a name="nextUnchangedN"></a><span class='hs-comment'>-- | goto n-th next unchanged line</span>
<a name="line-387"></a><span class='hs-definition'>nextUnchangedN</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BSTArray</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</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-conid'>Int</span>
<a name="line-388"></a><span class='hs-definition'>nextUnchangedN</span> <span class='hs-varid'>c</span> <span class='hs-varid'>n</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-389"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>n</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-varid'>i</span>
<a name="line-390"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>i'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>skipOneUnChanged</span> <span class='hs-varid'>c</span> <span class='hs-varid'>i</span>
<a name="line-391"></a> <span class='hs-varid'>nextUnchangedN</span> <span class='hs-varid'>c</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'>i'</span>
<a name="line-392"></a>
<a name="line-393"></a><a name="nextChanged"></a><span class='hs-comment'>-- | goto next changed line, return the given line if changed</span>
<a name="line-394"></a><span class='hs-definition'>nextChanged</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BSTArray</span> <span class='hs-varid'>s</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'>Maybe</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-395"></a><span class='hs-definition'>nextChanged</span> <span class='hs-varid'>c</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-396"></a> <span class='hs-varid'>len</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>aLenM</span> <span class='hs-varid'>c</span>
<a name="line-397"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>i</span> <span class='hs-varop'><=</span> <span class='hs-varid'>len</span>
<a name="line-398"></a> <span class='hs-keyword'>then</span> <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'>c</span> <span class='hs-varid'>i</span>
<a name="line-399"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>not</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>nextChanged</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-400"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>i</span>
<a name="line-401"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-402"></a>
<a name="line-403"></a><a name="prevUnchanged"></a><span class='hs-comment'>-- | goto previous unchanged line, return the given line if unchanged</span>
<a name="line-404"></a><span class='hs-definition'>prevUnchanged</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BSTArray</span> <span class='hs-varid'>s</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-conid'>Int</span>
<a name="line-405"></a><span class='hs-definition'>prevUnchanged</span> <span class='hs-varid'>c</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-406"></a> <span class='hs-varid'>b</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readArray</span> <span class='hs-varid'>c</span> <span class='hs-varid'>i</span>
<a name="line-407"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>prevUnchanged</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-408"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-varid'>i</span>
<a name="line-409"></a>
<a name="line-410"></a><a name="HArray"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>HArray</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>UArray</span> <span class='hs-conid'>Int</span> <span class='hs-conid'>Int32</span>
<a name="line-411"></a><a name="BArray"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>BArray</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>UArray</span> <span class='hs-conid'>Int</span> <span class='hs-conid'>Bool</span>
<a name="line-412"></a><a name="PArray"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Array</span> <span class='hs-conid'>Int</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span>
<a name="line-413"></a><a name="MapArray"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>MapArray</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>UArray</span> <span class='hs-conid'>Int</span> <span class='hs-conid'>Int</span>
<a name="line-414"></a><a name="VSTArray"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>VSTArray</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>STUArray</span> <span class='hs-varid'>s</span> <span class='hs-conid'>Int</span> <span class='hs-conid'>Int</span>
<a name="line-415"></a><a name="BSTArray"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>BSTArray</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>STUArray</span> <span class='hs-varid'>s</span> <span class='hs-conid'>Int</span> <span class='hs-conid'>Bool</span>
<a name="line-416"></a>
<a name="line-417"></a><a name="initV"></a><span class='hs-definition'>initV</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'>VSTArray</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-418"></a><span class='hs-definition'>initV</span> <span class='hs-varid'>dmax</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-419"></a> <span class='hs-varid'>newArray</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-layout'>(</span><span class='hs-varid'>dmax</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>dmax</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-420"></a>
<a name="line-421"></a><a name="initVRev"></a><span class='hs-definition'>initVRev</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</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'>VSTArray</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-422"></a><span class='hs-definition'>initVRev</span> <span class='hs-varid'>dmax</span> <span class='hs-varid'>xmax</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-423"></a> <span class='hs-varid'>newArray</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-layout'>(</span><span class='hs-varid'>dmax</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>dmax</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>xmax</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-424"></a>
<a name="line-425"></a><a name="initVChanged"></a><span class='hs-comment'>-- 1 indexed, v[0] is used as a guard element</span>
<a name="line-426"></a><span class='hs-definition'>initVChanged</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'>BSTArray</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-427"></a><span class='hs-definition'>initVChanged</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-428"></a> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newArray</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-conid'>True</span>
<a name="line-429"></a> <span class='hs-varid'>writeArray</span> <span class='hs-varid'>a</span> <span class='hs-num'>0</span> <span class='hs-conid'>False</span>
<a name="line-430"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>a</span>
<a name="line-431"></a> <span class='hs-comment'>-- set to false for all lines which have a mapping later</span>
<a name="line-432"></a> <span class='hs-comment'>-- other lines are only present in one of the files</span>
<a name="line-433"></a>
<a name="line-434"></a><a name="initH"></a><span class='hs-definition'>initH</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int32</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HArray</span>
<a name="line-435"></a><span class='hs-definition'>initH</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>listArray</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-varid'>length</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-conop'>:</span><span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-436"></a>
<a name="line-437"></a><a name="initM"></a><span class='hs-definition'>initM</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MapArray</span>
<a name="line-438"></a><span class='hs-definition'>initM</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>listArray</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-varid'>length</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-conop'>:</span><span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-439"></a>
<a name="line-440"></a><a name="initP"></a><span class='hs-definition'>initP</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span>
<a name="line-441"></a><span class='hs-definition'>initP</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>listArray</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-varid'>length</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span><span class='hs-conop'>:</span><span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-442"></a>
<a name="line-443"></a><a name="aLen"></a><span class='hs-definition'>aLen</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>IArray</span> <span class='hs-varid'>a</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-conid'>Int</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-444"></a><span class='hs-definition'>aLen</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>snd</span> <span class='hs-varop'>$</span> <span class='hs-varid'>bounds</span> <span class='hs-varid'>a</span>
<a name="line-445"></a><a name="aLenM"></a><span class='hs-definition'>aLenM</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MArray</span> <span class='hs-varid'>a</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-conid'>Int</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>Int</span>
<a name="line-446"></a><span class='hs-definition'>aLenM</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getBounds</span> <span class='hs-varid'>a</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-varid'>snd</span>
<a name="line-447"></a>
<a name="line-448"></a><a name="convertPatch"></a><span class='hs-definition'>convertPatch</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PArray</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'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-449"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Int</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-450"></a><span class='hs-definition'>convertPatch</span> <span class='hs-varid'>off</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-varid'>a0</span><span class='hs-layout'>,</span><span class='hs-varid'>a1</span><span class='hs-layout'>,</span><span class='hs-varid'>b0</span><span class='hs-layout'>,</span><span class='hs-varid'>b1</span><span class='hs-layout'>)</span>
<a name="line-451"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>b0</span> <span class='hs-varop'>==</span> <span class='hs-varid'>b1</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>b0</span><span class='hs-varop'>+</span><span class='hs-varid'>off</span><span class='hs-layout'>,</span><span class='hs-varid'>getDelete</span> <span class='hs-varid'>a</span> <span class='hs-varid'>a0</span> <span class='hs-varid'>a1</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-452"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>a0</span> <span class='hs-varop'>==</span> <span class='hs-varid'>a1</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>b0</span><span class='hs-varop'>+</span><span class='hs-varid'>off</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-varid'>getInsert</span> <span class='hs-varid'>b</span> <span class='hs-varid'>b0</span> <span class='hs-varid'>b1</span><span class='hs-layout'>)</span>
<a name="line-453"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>b0</span><span class='hs-varop'>+</span><span class='hs-varid'>off</span><span class='hs-layout'>,</span><span class='hs-varid'>getDelete</span> <span class='hs-varid'>a</span> <span class='hs-varid'>a0</span> <span class='hs-varid'>a1</span><span class='hs-layout'>,</span><span class='hs-varid'>getInsert</span> <span class='hs-varid'>b</span> <span class='hs-varid'>b0</span> <span class='hs-varid'>b1</span><span class='hs-layout'>)</span>
<a name="line-454"></a>
<a name="line-455"></a><a name="getInsert"></a><span class='hs-definition'>getInsert</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span>
<a name="line-456"></a><span class='hs-definition'>getInsert</span> <span class='hs-varid'>b</span> <span class='hs-varid'>from</span> <span class='hs-varid'>to</span>
<a name="line-457"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>from</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-458"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span><span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-varid'>from</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-layout'>(</span><span class='hs-varid'>getInsert</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-varid'>from</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>to</span><span class='hs-layout'>)</span>
<a name="line-459"></a><a name="getDelete"></a><span class='hs-definition'>getDelete</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span>
<a name="line-460"></a><span class='hs-definition'>getDelete</span> <span class='hs-varid'>a</span> <span class='hs-varid'>from</span> <span class='hs-varid'>to</span>
<a name="line-461"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>from</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>to</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-462"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-varid'>from</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-layout'>(</span><span class='hs-varid'>getDelete</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-varid'>from</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>to</span><span class='hs-layout'>)</span>
<a name="line-463"></a>
<a name="line-464"></a><a name="createPatch"></a><span class='hs-definition'>createPatch</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>BArray</span> <span class='hs-keyglyph'>-></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'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-465"></a><span class='hs-definition'>createPatch</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>c_b</span> <span class='hs-keyglyph'>=</span>
<a name="line-466"></a> <span class='hs-varid'>reverse</span> <span class='hs-varop'>$</span> <span class='hs-varid'>createP</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>c_b</span> <span class='hs-layout'>(</span><span class='hs-varid'>aLen</span> <span class='hs-varid'>c_a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>aLen</span> <span class='hs-varid'>c_b</span><span class='hs-layout'>)</span>
<a name="line-467"></a>
<a name="line-468"></a><a name="createP"></a><span class='hs-definition'>createP</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>BArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></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'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-469"></a><span class='hs-definition'>createP</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-470"></a><span class='hs-definition'>createP</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>c_b</span> <span class='hs-varid'>ia</span> <span class='hs-varid'>ib</span> <span class='hs-keyglyph'>=</span>
<a name="line-471"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>c_a</span><span class='hs-varop'>!</span><span class='hs-varid'>ia</span> <span class='hs-varop'>||</span> <span class='hs-varid'>c_b</span><span class='hs-varop'>!</span><span class='hs-varid'>ib</span>
<a name="line-472"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>ia'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>skipChangedRev</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>ia</span>
<a name="line-473"></a> <span class='hs-varid'>ib'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>skipChangedRev</span> <span class='hs-varid'>c_b</span> <span class='hs-varid'>ib</span>
<a name="line-474"></a> <span class='hs-keyword'>in</span> <span class='hs-layout'>(</span><span class='hs-varid'>ia'</span><span class='hs-layout'>,</span><span class='hs-varid'>ia</span><span class='hs-layout'>,</span><span class='hs-varid'>ib'</span><span class='hs-layout'>,</span><span class='hs-varid'>ib</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-layout'>(</span><span class='hs-varid'>createP</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>c_b</span> <span class='hs-varid'>ia'</span> <span class='hs-varid'>ib'</span><span class='hs-layout'>)</span>
<a name="line-475"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>createP</span> <span class='hs-varid'>c_a</span> <span class='hs-varid'>c_b</span> <span class='hs-layout'>(</span><span class='hs-varid'>ia</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>ib</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-476"></a>
<a name="line-477"></a><a name="skipChangedRev"></a><span class='hs-definition'>skipChangedRev</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BArray</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-478"></a><span class='hs-definition'>skipChangedRev</span> <span class='hs-varid'>c</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-num'>0</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>c</span><span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>skipChangedRev</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>i</span>
</pre></body>
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