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<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>class Kramdown::Utils::StringScanner - RDoc Documentation</title> <script type="text/javascript"> var rdoc_rel_prefix = "../../"; var index_rel_prefix = "../../"; </script> <script src="../../js/jquery.js"></script> <script src="../../js/darkfish.js"></script> <link href="../../css/fonts.css" rel="stylesheet"> <link href="../../css/rdoc.css" rel="stylesheet"> <body id="top" role="document" class="class"> <nav role="navigation"> <div id="project-navigation"> <div id="home-section" role="region" title="Quick navigation" class="nav-section"> <h2> <a href="../../index.html" rel="home">Home</a> </h2> <div id="table-of-contents-navigation"> <a href="../../table_of_contents.html#pages">Pages</a> <a href="../../table_of_contents.html#classes">Classes</a> <a href="../../table_of_contents.html#methods">Methods</a> </div> </div> <div id="search-section" role="search" class="project-section initially-hidden"> <form action="#" method="get" accept-charset="utf-8"> <div id="search-field-wrapper"> <input id="search-field" role="combobox" aria-label="Search" aria-autocomplete="list" aria-controls="search-results" type="text" name="search" placeholder="Search" spellcheck="false" title="Type to search, Up and Down to navigate, Enter to load"> </div> <ul id="search-results" aria-label="Search Results" aria-busy="false" aria-expanded="false" aria-atomic="false" class="initially-hidden"></ul> </form> </div> </div> <div id="class-metadata"> <div id="parent-class-section" class="nav-section"> <h3>Parent</h3> <p class="link">StringScanner </div> <!-- Method Quickref --> <div id="method-list-section" class="nav-section"> <h3>Methods</h3> <ul class="link-list" role="directory"> <li class="calls-super" ><a href="#method-c-new">::new</a> <li ><a href="#method-i-current_line_number">#current_line_number</a> <li class="calls-super" ><a href="#method-i-pos-3D">#pos=</a> <li ><a href="#method-i-revert_pos">#revert_pos</a> <li ><a href="#method-i-save_pos">#save_pos</a> </ul> </div> </div> </nav> <main role="main" aria-labelledby="class-Kramdown::Utils::StringScanner"> <h1 id="class-Kramdown::Utils::StringScanner" class="class"> class Kramdown::Utils::StringScanner </h1> <section class="description"> <p>This patched <a href="StringScanner.html">StringScanner</a> adds line number information for current scan position and a <a href="StringScanner.html#attribute-i-start_line_number">#start_line_number</a> override for nested StringScanners.</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-start_line_number" class="method-detail"> <div class="method-heading attribute-method-heading"> <span class="method-name">start_line_number</span><span class="attribute-access-type">[R]</span> </div> <div class="method-description"> <p>The start line number. Used for nested StringScanners that scan a sub-string of the source document. The kramdown parser uses this, e.g., for span level parsers.</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-new" class="method-detail "> <div class="method-heading"> <span class="method-name">new</span><span class="method-args">(string, start_line_number = 1)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>Takes the start line number as optional second argument.</p> <p>Note: The original second argument is no longer used so this should be safe.</p> <div class="method-calls-super"> Calls superclass method </div> <div class="method-source-code" id="new-source"> <pre><span class="ruby-comment"># File lib/kramdown/utils/string_scanner.rb, line 26</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">string</span>, <span class="ruby-identifier">start_line_number</span> = <span class="ruby-value">1</span>) <span class="ruby-keyword">super</span>(<span class="ruby-identifier">string</span>) <span class="ruby-ivar">@start_line_number</span> = <span class="ruby-identifier">start_line_number</span> <span class="ruby-operator">||</span> <span class="ruby-value">1</span> <span class="ruby-ivar">@previous_pos</span> = <span class="ruby-value">0</span> <span class="ruby-ivar">@previous_line_number</span> = <span class="ruby-ivar">@start_line_number</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-current_line_number" class="method-detail "> <div class="method-heading"> <span class="method-name">current_line_number</span><span class="method-args">()</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>Returns the line number for current charpos.</p> <p>NOTE: Requires that all line endings are normalized to 'n'</p> <p>NOTE: Normally we'd have to add one to the count of newlines to get the correct line number. However we add the one indirectly by using a one-based start_line_number.</p> <div class="method-source-code" id="current_line_number-source"> <pre><span class="ruby-comment"># File lib/kramdown/utils/string_scanner.rb, line 67</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">current_line_number</span> <span class="ruby-comment"># Not using string[@previous_pos..best_pos].count('\n') because it is slower</span> <span class="ruby-identifier">strscan</span> = <span class="ruby-operator">::</span><span class="ruby-constant">StringScanner</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">string</span>) <span class="ruby-identifier">strscan</span>.<span class="ruby-identifier">pos</span> = <span class="ruby-ivar">@previous_pos</span> <span class="ruby-identifier">old_pos</span> = <span class="ruby-identifier">pos</span> <span class="ruby-operator">+</span> <span class="ruby-value">1</span> <span class="ruby-ivar">@previous_line_number</span> <span class="ruby-operator">+=</span> <span class="ruby-value">1</span> <span class="ruby-keyword">while</span> <span class="ruby-identifier">strscan</span>.<span class="ruby-identifier">skip_until</span>(<span class="ruby-regexp">/\n/</span>) <span class="ruby-operator">&&</span> <span class="ruby-identifier">strscan</span>.<span class="ruby-identifier">pos</span> <span class="ruby-operator"><=</span> <span class="ruby-identifier">old_pos</span> <span class="ruby-ivar">@previous_pos</span> = (<span class="ruby-identifier">eos?</span> <span class="ruby-operator">?</span> <span class="ruby-identifier">pos</span> <span class="ruby-operator">:</span> <span class="ruby-identifier">pos</span> <span class="ruby-operator">+</span> <span class="ruby-value">1</span>) <span class="ruby-ivar">@previous_line_number</span> <span class="ruby-keyword">end</span></pre> </div> </div> </div> <div id="method-i-pos-3D" class="method-detail "> <div class="method-heading"> <span class="method-name">pos=</span><span class="method-args">(pos)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>Sets the byte position of the scan pointer.</p> <p>Note: This also resets some internal variables, so always use pos= when setting the position and don't use any other method for that!</p> <div class="method-calls-super"> Calls superclass method </div> <div class="method-source-code" id="pos-3D-source"> <pre><span class="ruby-comment"># File lib/kramdown/utils/string_scanner.rb, line 37</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">pos=</span>(<span class="ruby-identifier">pos</span>) <span class="ruby-keyword">if</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier">pos</span> <span class="ruby-operator">></span> <span class="ruby-identifier">pos</span> <span class="ruby-ivar">@previous_line_number</span> = <span class="ruby-ivar">@start_line_number</span> <span class="ruby-ivar">@previous_pos</span> = <span class="ruby-value">0</span> <span class="ruby-keyword">end</span> <span class="ruby-keyword">super</span> <span class="ruby-keyword">end</span></pre> </div> </div> </div> <div id="method-i-revert_pos" class="method-detail "> <div class="method-heading"> <span class="method-name">revert_pos</span><span class="method-args">(data)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>Revert the position to one saved by <a href="StringScanner.html#method-i-save_pos">save_pos</a>.</p> <div class="method-source-code" id="revert_pos-source"> <pre><span class="ruby-comment"># File lib/kramdown/utils/string_scanner.rb, line 56</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">revert_pos</span>(<span class="ruby-identifier">data</span>) <span class="ruby-keyword">self</span>.<span class="ruby-identifier">pos</span> = <span class="ruby-identifier">data</span>[<span class="ruby-value">0</span>] <span class="ruby-ivar">@previous_pos</span>, <span class="ruby-ivar">@previous_line_number</span> = <span class="ruby-identifier">data</span>[<span class="ruby-value">1</span>], <span class="ruby-identifier">data</span>[<span class="ruby-value">2</span>] <span class="ruby-keyword">end</span></pre> </div> </div> </div> <div id="method-i-save_pos" class="method-detail "> <div class="method-heading"> <span class="method-name">save_pos</span><span class="method-args">()</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>Return information needed to revert the byte position of the string scanner in a performant way.</p> <p>The returned data can be fed to <a href="StringScanner.html#method-i-revert_pos">revert_pos</a> to revert the position to the saved one.</p> <p>Note: Just saving pos won't be enough.</p> <div class="method-source-code" id="save_pos-source"> <pre><span class="ruby-comment"># File lib/kramdown/utils/string_scanner.rb, line 51</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">save_pos</span> [<span class="ruby-identifier">pos</span>, <span class="ruby-ivar">@previous_pos</span>, <span class="ruby-ivar">@previous_line_number</span>] <span class="ruby-keyword">end</span></pre> </div> </div> </div> </section> </section> </main> <footer id="validator-badges" role="contentinfo"> <p><a href="https://validator.w3.org/check/referer">Validate</a> <p>Generated by <a href="https://ruby.github.io/rdoc/">RDoc</a> 6.0.1. <p>Based on <a href="http://deveiate.org/projects/Darkfish-RDoc/">Darkfish</a> by <a href="http://deveiate.org">Michael Granger</a>. </footer>
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