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<title>src/Data/Algorithm/DiffOutput.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : Data.Algorithm.DiffOutput</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) Sterling Clover 2008-2011, Kevin Charter 2011</span>
<a name="line-5"></a><span class='hs-comment'>-- License : BSD 3 Clause</span>
<a name="line-6"></a><span class='hs-comment'>-- Maintainer : s.clover@gmail.com</span>
<a name="line-7"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-8"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-9"></a><span class='hs-comment'>-- Author : Stephan Wehr (wehr@factisresearch.com) and JP Moresmau (jp@moresmau.fr)</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- Generates a string output that is similar to diff normal mode</span>
<a name="line-12"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-13"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Algorithm</span><span class='hs-varop'>.</span><span class='hs-conid'>DiffOutput</span> <span class='hs-keyword'>where</span>
<a name="line-14"></a>
<a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Algorithm</span><span class='hs-varop'>.</span><span class='hs-conid'>Diff</span>
<a name="line-16"></a>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>PrettyPrint</span>
<a name="line-18"></a>
<a name="line-19"></a><a name="ppDiff"></a><span class='hs-comment'>-- | pretty print the differences. The output is similar to the output of the diff utility</span>
<a name="line-20"></a><span class='hs-definition'>ppDiff</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Diff</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-21"></a><span class='hs-definition'>ppDiff</span> <span class='hs-varid'>gdiff</span> <span class='hs-keyglyph'>=</span>
<a name="line-22"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>diffLineRanges</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toLineRange</span> <span class='hs-num'>1</span> <span class='hs-num'>1</span> <span class='hs-varid'>gdiff</span>
<a name="line-23"></a> <span class='hs-keyword'>in</span>
<a name="line-24"></a> <span class='hs-varid'>render</span> <span class='hs-layout'>(</span><span class='hs-varid'>prettyDiffs</span> <span class='hs-varid'>diffLineRanges</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-str'>"\n"</span>
<a name="line-25"></a> <span class='hs-keyword'>where</span>
<a name="line-26"></a> <span class='hs-varid'>toLineRange</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'>Diff</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DiffOperation</span> <span class='hs-conid'>LineRange</span><span class='hs-keyglyph'>]</span>
<a name="line-27"></a> <span class='hs-varid'>toLineRange</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span><span class='hs-keyglyph'>=</span><span class='hs-conid'>[]</span>
<a name="line-28"></a> <span class='hs-varid'>toLineRange</span> <span class='hs-varid'>leftLine</span> <span class='hs-varid'>rightLine</span> <span class='hs-layout'>(</span><span class='hs-conid'>Both</span> <span class='hs-varid'>ls</span> <span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>rs</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>=</span>
<a name="line-29"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>lins</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>length</span> <span class='hs-varid'>ls</span>
<a name="line-30"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>toLineRange</span> <span class='hs-layout'>(</span><span class='hs-varid'>leftLine</span><span class='hs-varop'>+</span><span class='hs-varid'>lins</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>rightLine</span><span class='hs-varop'>+</span><span class='hs-varid'>lins</span><span class='hs-layout'>)</span> <span class='hs-varid'>rs</span>
<a name="line-31"></a> <span class='hs-varid'>toLineRange</span> <span class='hs-varid'>leftLine</span> <span class='hs-varid'>rightLine</span> <span class='hs-layout'>(</span><span class='hs-conid'>Second</span> <span class='hs-varid'>lsS</span><span class='hs-conop'>:</span><span class='hs-conid'>First</span> <span class='hs-varid'>lsF</span><span class='hs-conop'>:</span><span class='hs-varid'>rs</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>=</span>
<a name="line-32"></a> <span class='hs-varid'>toChange</span> <span class='hs-varid'>leftLine</span> <span class='hs-varid'>rightLine</span> <span class='hs-varid'>lsF</span> <span class='hs-varid'>lsS</span> <span class='hs-varid'>rs</span>
<a name="line-33"></a> <span class='hs-varid'>toLineRange</span> <span class='hs-varid'>leftLine</span> <span class='hs-varid'>rightLine</span> <span class='hs-layout'>(</span><span class='hs-conid'>First</span> <span class='hs-varid'>lsF</span><span class='hs-conop'>:</span><span class='hs-conid'>Second</span> <span class='hs-varid'>lsS</span><span class='hs-conop'>:</span><span class='hs-varid'>rs</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>=</span>
<a name="line-34"></a> <span class='hs-varid'>toChange</span> <span class='hs-varid'>leftLine</span> <span class='hs-varid'>rightLine</span> <span class='hs-varid'>lsF</span> <span class='hs-varid'>lsS</span> <span class='hs-varid'>rs</span>
<a name="line-35"></a> <span class='hs-varid'>toLineRange</span> <span class='hs-varid'>leftLine</span> <span class='hs-varid'>rightLine</span> <span class='hs-layout'>(</span><span class='hs-conid'>Second</span> <span class='hs-varid'>lsS</span><span class='hs-conop'>:</span><span class='hs-varid'>rs</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>=</span>
<a name="line-36"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>linesS</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>length</span> <span class='hs-varid'>lsS</span>
<a name="line-37"></a> <span class='hs-varid'>diff</span><span class='hs-keyglyph'>=</span><span class='hs-conid'>Addition</span> <span class='hs-layout'>(</span><span class='hs-conid'>LineRange</span> <span class='hs-layout'>(</span><span class='hs-varid'>rightLine</span><span class='hs-layout'>,</span><span class='hs-varid'>rightLine</span><span class='hs-varop'>+</span><span class='hs-varid'>linesS</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>lsS</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>leftLine</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-38"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>diff</span> <span class='hs-conop'>:</span> <span class='hs-varid'>toLineRange</span> <span class='hs-varid'>leftLine</span> <span class='hs-layout'>(</span><span class='hs-varid'>rightLine</span><span class='hs-varop'>+</span><span class='hs-varid'>linesS</span><span class='hs-layout'>)</span> <span class='hs-varid'>rs</span>
<a name="line-39"></a> <span class='hs-varid'>toLineRange</span> <span class='hs-varid'>leftLine</span> <span class='hs-varid'>rightLine</span> <span class='hs-layout'>(</span><span class='hs-conid'>First</span> <span class='hs-varid'>lsF</span><span class='hs-conop'>:</span><span class='hs-varid'>rs</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>=</span>
<a name="line-40"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>linesF</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>length</span> <span class='hs-varid'>lsF</span>
<a name="line-41"></a> <span class='hs-varid'>diff</span><span class='hs-keyglyph'>=</span><span class='hs-conid'>Deletion</span> <span class='hs-layout'>(</span><span class='hs-conid'>LineRange</span> <span class='hs-layout'>(</span><span class='hs-varid'>leftLine</span><span class='hs-layout'>,</span><span class='hs-varid'>leftLine</span><span class='hs-varop'>+</span><span class='hs-varid'>linesF</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>lsF</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>rightLine</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-42"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>diff</span><span class='hs-conop'>:</span> <span class='hs-varid'>toLineRange</span><span class='hs-layout'>(</span><span class='hs-varid'>leftLine</span><span class='hs-varop'>+</span><span class='hs-varid'>linesF</span><span class='hs-layout'>)</span> <span class='hs-varid'>rightLine</span> <span class='hs-varid'>rs</span>
<a name="line-43"></a> <span class='hs-varid'>toChange</span> <span class='hs-varid'>leftLine</span> <span class='hs-varid'>rightLine</span> <span class='hs-varid'>lsF</span> <span class='hs-varid'>lsS</span> <span class='hs-varid'>rs</span><span class='hs-keyglyph'>=</span>
<a name="line-44"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>linesS</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>length</span> <span class='hs-varid'>lsS</span>
<a name="line-45"></a> <span class='hs-varid'>linesF</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>length</span> <span class='hs-varid'>lsF</span>
<a name="line-46"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>Change</span> <span class='hs-layout'>(</span><span class='hs-conid'>LineRange</span> <span class='hs-layout'>(</span><span class='hs-varid'>leftLine</span><span class='hs-layout'>,</span><span class='hs-varid'>leftLine</span><span class='hs-varop'>+</span><span class='hs-varid'>linesF</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>lsF</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>LineRange</span> <span class='hs-layout'>(</span><span class='hs-varid'>rightLine</span><span class='hs-layout'>,</span><span class='hs-varid'>rightLine</span><span class='hs-varop'>+</span><span class='hs-varid'>linesS</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>lsS</span><span class='hs-layout'>)</span>
<a name="line-47"></a> <span class='hs-conop'>:</span> <span class='hs-varid'>toLineRange</span> <span class='hs-layout'>(</span><span class='hs-varid'>leftLine</span><span class='hs-varop'>+</span><span class='hs-varid'>linesF</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>rightLine</span><span class='hs-varop'>+</span><span class='hs-varid'>linesS</span><span class='hs-layout'>)</span> <span class='hs-varid'>rs</span>
<a name="line-48"></a>
<a name="line-49"></a><a name="prettyDiffs"></a><span class='hs-comment'>-- | pretty print of diff operations</span>
<a name="line-50"></a><span class='hs-definition'>prettyDiffs</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DiffOperation</span> <span class='hs-conid'>LineRange</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Doc</span>
<a name="line-51"></a><span class='hs-definition'>prettyDiffs</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-52"></a><span class='hs-definition'>prettyDiffs</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-conop'>:</span> <span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>prettyDiff</span> <span class='hs-varid'>d</span> <span class='hs-varop'>$$</span> <span class='hs-varid'>prettyDiffs</span> <span class='hs-varid'>rest</span>
<a name="line-53"></a> <span class='hs-keyword'>where</span>
<a name="line-54"></a> <span class='hs-varid'>prettyDiff</span> <span class='hs-layout'>(</span><span class='hs-conid'>Deletion</span> <span class='hs-varid'>inLeft</span> <span class='hs-varid'>lineNoRight</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-55"></a> <span class='hs-varid'>prettyRange</span> <span class='hs-layout'>(</span><span class='hs-varid'>lrNumbers</span> <span class='hs-varid'>inLeft</span><span class='hs-layout'>)</span> <span class='hs-varop'><></span> <span class='hs-varid'>char</span> <span class='hs-chr'>'d'</span> <span class='hs-varop'><></span> <span class='hs-varid'>int</span> <span class='hs-varid'>lineNoRight</span> <span class='hs-varop'>$$</span>
<a name="line-56"></a> <span class='hs-varid'>prettyLines</span> <span class='hs-chr'>'<'</span> <span class='hs-layout'>(</span><span class='hs-varid'>lrContents</span> <span class='hs-varid'>inLeft</span><span class='hs-layout'>)</span>
<a name="line-57"></a> <span class='hs-varid'>prettyDiff</span> <span class='hs-layout'>(</span><span class='hs-conid'>Addition</span> <span class='hs-varid'>inRight</span> <span class='hs-varid'>lineNoLeft</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-58"></a> <span class='hs-varid'>int</span> <span class='hs-varid'>lineNoLeft</span> <span class='hs-varop'><></span> <span class='hs-varid'>char</span> <span class='hs-chr'>'a'</span> <span class='hs-varop'><></span> <span class='hs-varid'>prettyRange</span> <span class='hs-layout'>(</span><span class='hs-varid'>lrNumbers</span> <span class='hs-varid'>inRight</span><span class='hs-layout'>)</span> <span class='hs-varop'>$$</span>
<a name="line-59"></a> <span class='hs-varid'>prettyLines</span> <span class='hs-chr'>'>'</span> <span class='hs-layout'>(</span><span class='hs-varid'>lrContents</span> <span class='hs-varid'>inRight</span><span class='hs-layout'>)</span>
<a name="line-60"></a> <span class='hs-varid'>prettyDiff</span> <span class='hs-layout'>(</span><span class='hs-conid'>Change</span> <span class='hs-varid'>inLeft</span> <span class='hs-varid'>inRight</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-61"></a> <span class='hs-varid'>prettyRange</span> <span class='hs-layout'>(</span><span class='hs-varid'>lrNumbers</span> <span class='hs-varid'>inLeft</span><span class='hs-layout'>)</span> <span class='hs-varop'><></span> <span class='hs-varid'>char</span> <span class='hs-chr'>'c'</span> <span class='hs-varop'><></span> <span class='hs-varid'>prettyRange</span> <span class='hs-layout'>(</span><span class='hs-varid'>lrNumbers</span> <span class='hs-varid'>inRight</span><span class='hs-layout'>)</span> <span class='hs-varop'>$$</span>
<a name="line-62"></a> <span class='hs-varid'>prettyLines</span> <span class='hs-chr'>'<'</span> <span class='hs-layout'>(</span><span class='hs-varid'>lrContents</span> <span class='hs-varid'>inLeft</span><span class='hs-layout'>)</span> <span class='hs-varop'>$$</span>
<a name="line-63"></a> <span class='hs-varid'>text</span> <span class='hs-str'>"---"</span> <span class='hs-varop'>$$</span>
<a name="line-64"></a> <span class='hs-varid'>prettyLines</span> <span class='hs-chr'>'>'</span> <span class='hs-layout'>(</span><span class='hs-varid'>lrContents</span> <span class='hs-varid'>inRight</span><span class='hs-layout'>)</span>
<a name="line-65"></a> <span class='hs-varid'>prettyRange</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span><span class='hs-layout'>,</span> <span class='hs-varid'>end</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-66"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>start</span> <span class='hs-varop'>==</span> <span class='hs-varid'>end</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>int</span> <span class='hs-varid'>start</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>int</span> <span class='hs-varid'>start</span> <span class='hs-varop'><></span> <span class='hs-varid'>comma</span> <span class='hs-varop'><></span> <span class='hs-varid'>int</span> <span class='hs-varid'>end</span>
<a name="line-67"></a> <span class='hs-varid'>prettyLines</span> <span class='hs-varid'>start</span> <span class='hs-varid'>lins</span> <span class='hs-keyglyph'>=</span>
<a name="line-68"></a> <span class='hs-varid'>vcat</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>l</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>char</span> <span class='hs-varid'>start</span> <span class='hs-varop'><+></span> <span class='hs-varid'>text</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-varid'>lins</span><span class='hs-layout'>)</span>
<a name="line-69"></a>
<a name="line-70"></a><a name="LineNo"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>LineNo</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Int</span>
<a name="line-71"></a>
<a name="line-72"></a><a name="LineRange"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>LineRange</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LineRange</span> <span class='hs-layout'>{</span> <span class='hs-varid'>lrNumbers</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>LineNo</span><span class='hs-layout'>,</span> <span class='hs-conid'>LineNo</span><span class='hs-layout'>)</span>
<a name="line-73"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>lrContents</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-74"></a> <span class='hs-layout'>}</span>
<a name="line-75"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-76"></a>
<a name="line-77"></a><a name="DiffOperation"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>DiffOperation</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Deletion</span> <span class='hs-varid'>a</span> <span class='hs-conid'>LineNo</span>
<a name="line-78"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Addition</span> <span class='hs-varid'>a</span> <span class='hs-conid'>LineNo</span>
<a name="line-79"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Change</span> <span class='hs-varid'>a</span> <span class='hs-varid'>a</span>
<a name="line-80"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
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