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+<!DOCTYPE html>
+
+<html>
+<head>
+<meta charset="UTF-8">
+
+<title>class LCS::ContextChange - diff-lcs-1.5.0 Documentation</title>
+
+<script type="text/javascript">
+ var rdoc_rel_prefix = "../";
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+ <a href="../table_of_contents.html#methods">Methods</a>
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+
+ <div id="class-metadata">
+
+
+<div id="parent-class-section" class="nav-section">
+ <h3>Parent</h3>
+
+ <p class="link">Diff::LCS::Change
+</div>
+
+
+
+
+<!-- Method Quickref -->
+<div id="method-list-section" class="nav-section">
+ <h3>Methods</h3>
+
+ <ul class="link-list" role="directory">
+ <li ><a href="#method-c-from_a">::from_a</a>
+ <li ><a href="#method-c-new">::new</a>
+ <li ><a href="#method-c-simplify">::simplify</a>
+ <li ><a href="#method-i-3C-3D-3E">#&lt;=&gt;</a>
+ <li ><a href="#method-i-3D-3D">#==</a>
+ <li ><a href="#method-i-to_a">#to_a</a>
+ <li ><a href="#method-i-to_ary">#to_ary</a>
+ </ul>
+</div>
+
+ </div>
+</nav>
+
+<main role="main" aria-labelledby="class-LCS::ContextChange">
+ <h1 id="class-LCS::ContextChange" class="class">
+ class LCS::ContextChange
+ </h1>
+
+ <section class="description">
+
+<p>Represents a contextual change. Contains the position and values of the elements in the old and the new sequenced enumerables as well as the action taken.</p>
+
+ </section>
+
+ <section id="5Buntitled-5D" class="documentation-section">
+
+
+
+ <section class="attribute-method-details" class="method-section">
+ <header>
+ <h3>Attributes</h3>
+ </header>
+
+ <div id="attribute-i-new_element" class="method-detail">
+ <div class="method-heading attribute-method-heading">
+ <span class="method-name">new_element</span><span
+ class="attribute-access-type">[R]</span>
+ </div>
+
+ <div class="method-description">
+ <p>Returns the new element being changed.</p>
+ </div>
+ </div>
+ <div id="attribute-i-new_position" class="method-detail">
+ <div class="method-heading attribute-method-heading">
+ <span class="method-name">new_position</span><span
+ class="attribute-access-type">[R]</span>
+ </div>
+
+ <div class="method-description">
+ <p>Returns the new position being changed.</p>
+ </div>
+ </div>
+ <div id="attribute-i-old_element" class="method-detail">
+ <div class="method-heading attribute-method-heading">
+ <span class="method-name">old_element</span><span
+ class="attribute-access-type">[R]</span>
+ </div>
+
+ <div class="method-description">
+ <p>Returns the old element being changed.</p>
+ </div>
+ </div>
+ <div id="attribute-i-old_position" class="method-detail">
+ <div class="method-heading attribute-method-heading">
+ <span class="method-name">old_position</span><span
+ class="attribute-access-type">[R]</span>
+ </div>
+
+ <div class="method-description">
+ <p>Returns the old position being changed.</p>
+ </div>
+ </div>
+ </section>
+
+
+ <section id="public-class-5Buntitled-5D-method-details" class="method-section">
+ <header>
+ <h3>Public Class Methods</h3>
+ </header>
+
+ <div id="method-c-from_a" class="method-detail ">
+ <div class="method-heading">
+ <span class="method-name">from_a</span><span
+ class="method-args">(arr)</span>
+ <span class="method-click-advice">click to toggle source</span>
+ </div>
+
+ <div class="method-description">
+
+
+ <div class="method-source-code" id="from_a-source">
+ <pre><span class="ruby-comment"># File lib/diff/lcs/change.rb, line 132</span>
+<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">from_a</span>(<span class="ruby-identifier">arr</span>)
+ <span class="ruby-constant">Diff</span><span class="ruby-operator">::</span><span class="ruby-constant">LCS</span><span class="ruby-operator">::</span><span class="ruby-constant">Change</span>.<span class="ruby-identifier">from_a</span>(<span class="ruby-identifier">arr</span>)
+<span class="ruby-keyword">end</span></pre>
+ </div>
+ </div>
+
+
+ </div>
+
+ <div id="method-c-new" class="method-detail ">
+ <div class="method-heading">
+ <span class="method-name">new</span><span
+ class="method-args">(*args)</span>
+ <span class="method-click-advice">click to toggle source</span>
+ </div>
+
+ <div class="method-description">
+
+
+ <div class="method-source-code" id="new-source">
+ <pre><span class="ruby-comment"># File lib/diff/lcs/change.rb, line 114</span>
+<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-operator">*</span><span class="ruby-identifier">args</span>)
+ <span class="ruby-ivar">@action</span>, <span class="ruby-ivar">@old_position</span>, <span class="ruby-ivar">@old_element</span>, <span class="ruby-ivar">@new_position</span>, <span class="ruby-ivar">@new_element</span> = <span class="ruby-operator">*</span><span class="ruby-identifier">args</span>
+
+ <span class="ruby-identifier">fail</span> <span class="ruby-node">&quot;Invalid Change Action &#39;#{@action}&#39;&quot;</span> <span class="ruby-keyword">unless</span> <span class="ruby-constant">Diff</span><span class="ruby-operator">::</span><span class="ruby-constant">LCS</span><span class="ruby-operator">::</span><span class="ruby-constant">Change</span>.<span class="ruby-identifier">valid_action?</span>(<span class="ruby-ivar">@action</span>)
+ <span class="ruby-identifier">fail</span> <span class="ruby-string">&#39;Invalid (Old) Position Type&#39;</span> <span class="ruby-keyword">unless</span> <span class="ruby-ivar">@old_position</span>.<span class="ruby-identifier">nil?</span> <span class="ruby-keyword">or</span> <span class="ruby-ivar">@old_position</span>.<span class="ruby-identifier">kind_of?</span> <span class="ruby-constant">IntClass</span>
+ <span class="ruby-identifier">fail</span> <span class="ruby-string">&#39;Invalid (New) Position Type&#39;</span> <span class="ruby-keyword">unless</span> <span class="ruby-ivar">@new_position</span>.<span class="ruby-identifier">nil?</span> <span class="ruby-keyword">or</span> <span class="ruby-ivar">@new_position</span>.<span class="ruby-identifier">kind_of?</span> <span class="ruby-constant">IntClass</span>
+<span class="ruby-keyword">end</span></pre>
+ </div>
+ </div>
+
+
+ </div>
+
+ <div id="method-c-simplify" class="method-detail ">
+ <div class="method-heading">
+ <span class="method-name">simplify</span><span
+ class="method-args">(event)</span>
+ <span class="method-click-advice">click to toggle source</span>
+ </div>
+
+ <div class="method-description">
+ <p>Simplifies a context change for use in some diff callbacks. &#39;&lt;&#39; actions are converted to &#39;-&#39; and &#39;&gt;&#39; actions are converted to &#39;+&#39;.</p>
+
+ <div class="method-source-code" id="simplify-source">
+ <pre><span class="ruby-comment"># File lib/diff/lcs/change.rb, line 138</span>
+<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">simplify</span>(<span class="ruby-identifier">event</span>)
+ <span class="ruby-identifier">ea</span> = <span class="ruby-identifier">event</span>.<span class="ruby-identifier">to_a</span>
+
+ <span class="ruby-keyword">case</span> <span class="ruby-identifier">ea</span>[<span class="ruby-value">0</span>]
+ <span class="ruby-keyword">when</span> <span class="ruby-string">&#39;-&#39;</span>
+ <span class="ruby-identifier">ea</span>[<span class="ruby-value">2</span>][<span class="ruby-value">1</span>] = <span class="ruby-keyword">nil</span>
+ <span class="ruby-keyword">when</span> <span class="ruby-string">&#39;&lt;&#39;</span>
+ <span class="ruby-identifier">ea</span>[<span class="ruby-value">0</span>] = <span class="ruby-string">&#39;-&#39;</span>
+ <span class="ruby-identifier">ea</span>[<span class="ruby-value">2</span>][<span class="ruby-value">1</span>] = <span class="ruby-keyword">nil</span>
+ <span class="ruby-keyword">when</span> <span class="ruby-string">&#39;+&#39;</span>
+ <span class="ruby-identifier">ea</span>[<span class="ruby-value">1</span>][<span class="ruby-value">1</span>] = <span class="ruby-keyword">nil</span>
+ <span class="ruby-keyword">when</span> <span class="ruby-string">&#39;&gt;&#39;</span>
+ <span class="ruby-identifier">ea</span>[<span class="ruby-value">0</span>] = <span class="ruby-string">&#39;+&#39;</span>
+ <span class="ruby-identifier">ea</span>[<span class="ruby-value">1</span>][<span class="ruby-value">1</span>] = <span class="ruby-keyword">nil</span>
+ <span class="ruby-keyword">end</span>
+
+ <span class="ruby-constant">Diff</span><span class="ruby-operator">::</span><span class="ruby-constant">LCS</span><span class="ruby-operator">::</span><span class="ruby-constant">ContextChange</span>.<span class="ruby-identifier">from_a</span>(<span class="ruby-identifier">ea</span>)
+<span class="ruby-keyword">end</span></pre>
+ </div>
+ </div>
+
+
+ </div>
+
+ </section>
+
+ <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
+ <header>
+ <h3>Public Instance Methods</h3>
+ </header>
+
+ <div id="method-i-3C-3D-3E" class="method-detail ">
+ <div class="method-heading">
+ <span class="method-name">&lt;=&gt;</span><span
+ class="method-args">(other)</span>
+ <span class="method-click-advice">click to toggle source</span>
+ </div>
+
+ <div class="method-description">
+
+
+ <div class="method-source-code" id="3C-3D-3E-source">
+ <pre><span class="ruby-comment"># File lib/diff/lcs/change.rb, line 166</span>
+<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">&lt;=&gt;</span>(<span class="ruby-identifier">other</span>)
+ <span class="ruby-identifier">r</span> = <span class="ruby-ivar">@action</span> <span class="ruby-operator">&lt;=&gt;</span> <span class="ruby-identifier">other</span>.<span class="ruby-identifier">action</span>
+ <span class="ruby-identifier">r</span> = <span class="ruby-ivar">@old_position</span> <span class="ruby-operator">&lt;=&gt;</span> <span class="ruby-identifier">other</span>.<span class="ruby-identifier">old_position</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">r</span>.<span class="ruby-identifier">zero?</span>
+ <span class="ruby-identifier">r</span> = <span class="ruby-ivar">@new_position</span> <span class="ruby-operator">&lt;=&gt;</span> <span class="ruby-identifier">other</span>.<span class="ruby-identifier">new_position</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">r</span>.<span class="ruby-identifier">zero?</span>
+ <span class="ruby-identifier">r</span> = <span class="ruby-ivar">@old_element</span> <span class="ruby-operator">&lt;=&gt;</span> <span class="ruby-identifier">other</span>.<span class="ruby-identifier">old_element</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">r</span>.<span class="ruby-identifier">zero?</span>
+ <span class="ruby-identifier">r</span> = <span class="ruby-ivar">@new_element</span> <span class="ruby-operator">&lt;=&gt;</span> <span class="ruby-identifier">other</span>.<span class="ruby-identifier">new_element</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">r</span>.<span class="ruby-identifier">zero?</span>
+ <span class="ruby-identifier">r</span>
+<span class="ruby-keyword">end</span></pre>
+ </div>
+ </div>
+
+
+ </div>
+
+ <div id="method-i-3D-3D" class="method-detail ">
+ <div class="method-heading">
+ <span class="method-name">==</span><span
+ class="method-args">(other)</span>
+ <span class="method-click-advice">click to toggle source</span>
+ </div>
+
+ <div class="method-description">
+
+
+ <div class="method-source-code" id="3D-3D-source">
+ <pre><span class="ruby-comment"># File lib/diff/lcs/change.rb, line 157</span>
+<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">==</span>(<span class="ruby-identifier">other</span>)
+ (<span class="ruby-keyword">self</span>.<span class="ruby-identifier">class</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">other</span>.<span class="ruby-identifier">class</span>) <span class="ruby-keyword">and</span>
+ (<span class="ruby-ivar">@action</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">other</span>.<span class="ruby-identifier">action</span>) <span class="ruby-keyword">and</span>
+ (<span class="ruby-ivar">@old_position</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">other</span>.<span class="ruby-identifier">old_position</span>) <span class="ruby-keyword">and</span>
+ (<span class="ruby-ivar">@new_position</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">other</span>.<span class="ruby-identifier">new_position</span>) <span class="ruby-keyword">and</span>
+ (<span class="ruby-ivar">@old_element</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">other</span>.<span class="ruby-identifier">old_element</span>) <span class="ruby-keyword">and</span>
+ (<span class="ruby-ivar">@new_element</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">other</span>.<span class="ruby-identifier">new_element</span>)
+<span class="ruby-keyword">end</span></pre>
+ </div>
+ </div>
+
+
+ </div>
+
+ <div id="method-i-to_a" class="method-detail ">
+ <div class="method-heading">
+ <span class="method-name">to_a</span><span
+ class="method-args">()</span>
+ <span class="method-click-advice">click to toggle source</span>
+ </div>
+
+ <div class="method-description">
+
+
+ <div class="method-source-code" id="to_a-source">
+ <pre><span class="ruby-comment"># File lib/diff/lcs/change.rb, line 122</span>
+<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">to_a</span>
+ [
+ <span class="ruby-ivar">@action</span>,
+ [<span class="ruby-ivar">@old_position</span>, <span class="ruby-ivar">@old_element</span>],
+ [<span class="ruby-ivar">@new_position</span>, <span class="ruby-ivar">@new_element</span>]
+ ]
+<span class="ruby-keyword">end</span></pre>
+ </div>
+ </div>
+
+ <div class="aliases">
+ Also aliased as: <a href="ContextChange.html#method-i-to_ary">to_ary</a>
+ </div>
+
+ </div>
+
+ <div id="method-i-to_ary" class="method-detail method-alias">
+ <div class="method-heading">
+ <span class="method-name">to_ary</span><span
+ class="method-args">()</span>
+ </div>
+
+ <div class="method-description">
+
+
+ </div>
+
+
+ <div class="aliases">
+ Alias for: <a href="ContextChange.html#method-i-to_a">to_a</a>
+ </div>
+ </div>
+
+ </section>
+
+ </section>
+</main>
+
+
+<footer id="validator-badges" role="contentinfo">
+ <p><a href="https://validator.w3.org/check/referer">Validate</a>
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