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      <h1 class="title">experimental/diff</h1>
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  <li>
  <a class="reference reference-toplevel" href="#6" id="56">Imports</a>
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  <details open>
    <summary><a class="reference reference-toplevel" href="#7" id="57">Types</a></summary>
    <ul class="simple simple-toc-section">
      <li><a class="reference" href="#Item" title="Item = object
  startA*: int               ## Start Line number in Data A.
  startB*: int               ## Start Line number in Data B.
  deletedA*: int             ## Number of changes in Data A.
  insertedB*: int            ## Number of changes in Data B.">Item</a></li>

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    <summary><a class="reference reference-toplevel" href="#12" id="62">Procs</a></summary>
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      <ul class="simple nested-toc-section">diffInt
  <li><a class="reference" href="#diffInt%2CopenArray%5Bint%5D%2CopenArray%5Bint%5D" title="diffInt(arrayA, arrayB: openArray[int]): seq[Item]">diffInt(arrayA, arrayB: openArray[int]): seq[Item]</a></li>

</ul>
<ul class="simple nested-toc-section">diffText
  <li><a class="reference" href="#diffText%2Cstring%2Cstring" title="diffText(textA, textB: string): seq[Item]">diffText(textA, textB: string): seq[Item]</a></li>

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  <div class="nine columns" id="content">
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/experimental/diff.nim#L1" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/experimental/diff.nim#L1" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

    <div id="tocRoot"></div>
    
    <p class="module-desc">This module implements an algorithm to compute the <span id="diff_1">diff</span> between two sequences of lines.<ul class="simple"><li>To learn more see <a class="reference external" href="https://wikipedia.org/wiki/Diff">Diff on Wikipedia.</a></li>
</ul>

<p><strong class="examples_text">Example:</strong></p>
<pre class="listing"><span class="Keyword">import</span> <span class="Identifier">experimental</span><span class="Operator">/</span><span class="Identifier">diff</span>
<span class="Identifier">assert</span> <span class="Identifier">diffInt</span><span class="Punctuation">(</span>
  <span class="Punctuation">[</span><span class="DecNumber">0</span><span class="Punctuation">,</span> <span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="DecNumber">2</span><span class="Punctuation">,</span> <span class="DecNumber">3</span><span class="Punctuation">,</span> <span class="DecNumber">4</span><span class="Punctuation">,</span> <span class="DecNumber">5</span><span class="Punctuation">,</span> <span class="DecNumber">6</span><span class="Punctuation">,</span> <span class="DecNumber">7</span><span class="Punctuation">,</span> <span class="DecNumber">8</span><span class="Punctuation">]</span><span class="Punctuation">,</span>
  <span class="Punctuation">[</span><span class="Operator">-</span><span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="DecNumber">2</span><span class="Punctuation">,</span> <span class="DecNumber">3</span><span class="Punctuation">,</span> <span class="DecNumber">4</span><span class="Punctuation">,</span> <span class="DecNumber">5</span><span class="Punctuation">,</span> <span class="DecNumber">666</span><span class="Punctuation">,</span> <span class="DecNumber">7</span><span class="Punctuation">,</span> <span class="DecNumber">42</span><span class="Punctuation">]</span><span class="Punctuation">)</span> <span class="Operator">==</span>
  <span class="Operator">@</span><span class="Punctuation">[</span><span class="Identifier">Item</span><span class="Punctuation">(</span><span class="Identifier">startA</span><span class="Punctuation">:</span> <span class="DecNumber">0</span><span class="Punctuation">,</span> <span class="Identifier">startB</span><span class="Punctuation">:</span> <span class="DecNumber">0</span><span class="Punctuation">,</span> <span class="Identifier">deletedA</span><span class="Punctuation">:</span> <span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="Identifier">insertedB</span><span class="Punctuation">:</span> <span class="DecNumber">1</span><span class="Punctuation">)</span><span class="Punctuation">,</span>
    <span class="Identifier">Item</span><span class="Punctuation">(</span><span class="Identifier">startA</span><span class="Punctuation">:</span> <span class="DecNumber">6</span><span class="Punctuation">,</span> <span class="Identifier">startB</span><span class="Punctuation">:</span> <span class="DecNumber">6</span><span class="Punctuation">,</span> <span class="Identifier">deletedA</span><span class="Punctuation">:</span> <span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="Identifier">insertedB</span><span class="Punctuation">:</span> <span class="DecNumber">1</span><span class="Punctuation">)</span><span class="Punctuation">,</span>
    <span class="Identifier">Item</span><span class="Punctuation">(</span><span class="Identifier">startA</span><span class="Punctuation">:</span> <span class="DecNumber">8</span><span class="Punctuation">,</span> <span class="Identifier">startB</span><span class="Punctuation">:</span> <span class="DecNumber">8</span><span class="Punctuation">,</span> <span class="Identifier">deletedA</span><span class="Punctuation">:</span> <span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="Identifier">insertedB</span><span class="Punctuation">:</span> <span class="DecNumber">1</span><span class="Punctuation">)</span><span class="Punctuation">]</span></pre>
<p><strong class="examples_text">Example:</strong></p>
<pre class="listing"><span class="Keyword">import</span> <span class="Identifier">experimental</span><span class="Operator">/</span><span class="Identifier">diff</span>
<span class="Comment"># 2 samples of text (from &quot;The Call of Cthulhu&quot; by Lovecraft)</span>
<span class="Keyword">let</span> <span class="Identifier">txt0</span> <span class="Operator">=</span> <span class="LongStringLit">&quot;&quot;&quot;
abc
def ghi
jkl2&quot;&quot;&quot;</span>
<span class="Keyword">let</span> <span class="Identifier">txt1</span> <span class="Operator">=</span> <span class="LongStringLit">&quot;&quot;&quot;
bacx
abc
def ghi
jkl&quot;&quot;&quot;</span>
<span class="Identifier">assert</span> <span class="Identifier">diffText</span><span class="Punctuation">(</span><span class="Identifier">txt0</span><span class="Punctuation">,</span> <span class="Identifier">txt1</span><span class="Punctuation">)</span> <span class="Operator">==</span>
  <span class="Operator">@</span><span class="Punctuation">[</span><span class="Identifier">Item</span><span class="Punctuation">(</span><span class="Identifier">startA</span><span class="Punctuation">:</span> <span class="DecNumber">0</span><span class="Punctuation">,</span> <span class="Identifier">startB</span><span class="Punctuation">:</span> <span class="DecNumber">0</span><span class="Punctuation">,</span> <span class="Identifier">deletedA</span><span class="Punctuation">:</span> <span class="DecNumber">0</span><span class="Punctuation">,</span> <span class="Identifier">insertedB</span><span class="Punctuation">:</span> <span class="DecNumber">1</span><span class="Punctuation">)</span><span class="Punctuation">,</span>
    <span class="Identifier">Item</span><span class="Punctuation">(</span><span class="Identifier">startA</span><span class="Punctuation">:</span> <span class="DecNumber">2</span><span class="Punctuation">,</span> <span class="Identifier">startB</span><span class="Punctuation">:</span> <span class="DecNumber">3</span><span class="Punctuation">,</span> <span class="Identifier">deletedA</span><span class="Punctuation">:</span> <span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="Identifier">insertedB</span><span class="Punctuation">:</span> <span class="DecNumber">1</span><span class="Punctuation">)</span><span class="Punctuation">]</span></pre></p>
    <div class="section" id="6">
  <h1><a class="toc-backref" href="#6">Imports</a></h1>
  <dl class="item">
    <a class="reference external" href="tables.html">tables</a>, <a class="reference external" href="strutils.html">strutils</a>, <a class="reference external" href="assertions.html">assertions</a>
  </dl>
</div>
<div class="section" id="7">
  <h1><a class="toc-backref" href="#7">Types</a></h1>
  <dl class="item">
    <div id="Item">
  <dt><pre><a href="diff.html#Item"><span class="Identifier">Item</span></a> <span class="Other">=</span> <span class="Keyword">object</span>
  <span class="Identifier">startA</span><span class="Operator">*</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a>               <span class="Comment">## Start Line number in Data A.</span>
  <span class="Identifier">startB</span><span class="Operator">*</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a>               <span class="Comment">## Start Line number in Data B.</span>
  <span class="Identifier">deletedA</span><span class="Operator">*</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a>             <span class="Comment">## Number of changes in Data A.</span>
  <span class="Identifier">insertedB</span><span class="Operator">*</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a>            <span class="Comment">## Number of changes in Data B.</span></pre></dt>
  <dd>
    
    An Item in the list of differences.
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/experimental/diff.nim#L52" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/experimental/diff.nim#L52" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

  </dl>
</div>
<div class="section" id="12">
  <h1><a class="toc-backref" href="#12">Procs</a></h1>
  <dl class="item">
    <div id="diffInt-procs-all">
  <div id="diffInt,openArray[int],openArray[int]">
  <dt><pre><span class="Keyword">proc</span> <a href="#diffInt%2CopenArray%5Bint%5D%2CopenArray%5Bint%5D"><span class="Identifier">diffInt</span></a><span class="Other">(</span><span class="Identifier">arrayA</span><span class="Other">,</span> <span class="Identifier">arrayB</span><span class="Other">:</span> <a href="system.html#openArray"><span class="Identifier">openArray</span></a><span class="Other">[</span><a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#seq"><span class="Identifier">seq</span></a><span class="Other">[</span><a href="diff.html#Item"><span class="Identifier">Item</span></a><span class="Other">]</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span>
    <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  <dd>
    
    <p>Find the difference in 2 arrays of integers.</p>
<p><tt class="docutils literal"><span class="pre"><span class="Identifier">arrayA</span></span></tt> A-version of the numbers (usually the old one)</p>
<p><tt class="docutils literal"><span class="pre"><span class="Identifier">arrayB</span></span></tt> B-version of the numbers (usually the new one)</p>
<p>Returns a sequence of Items that describe the differences.</p>

    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/experimental/diff.nim#L282" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/experimental/diff.nim#L282" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>
<div id="diffText-procs-all">
  <div id="diffText,string,string">
  <dt><pre><span class="Keyword">proc</span> <a href="#diffText%2Cstring%2Cstring"><span class="Identifier">diffText</span></a><span class="Other">(</span><span class="Identifier">textA</span><span class="Other">,</span> <span class="Identifier">textB</span><span class="Other">:</span> <a href="system.html#string"><span class="Identifier">string</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#seq"><span class="Identifier">seq</span></a><span class="Other">[</span><a href="diff.html#Item"><span class="Identifier">Item</span></a><span class="Other">]</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">KeyError</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span>
    <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  <dd>
    
    <p>Find the difference in 2 text documents, comparing by textlines.</p>
<p>The algorithm itself is comparing 2 arrays of numbers so when comparing 2 text documents each line is converted into a (hash) number. This hash-value is computed by storing all textlines into a common hashtable so i can find duplicates in there, and generating a new number each time a new textline is inserted.</p>
<p><tt class="docutils literal"><span class="pre"><span class="Identifier">textA</span></span></tt> A-version of the text (usually the old one)</p>
<p><tt class="docutils literal"><span class="pre"><span class="Identifier">textB</span></span></tt> B-version of the text (usually the new one)</p>
<p>Returns a seq of Items that describe the differences.</p>

    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/experimental/diff.nim#L306" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/experimental/diff.nim#L306" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
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