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<h1 class="title">highlighter.cpp Example File</h1>
<span class="subtitle">richtext/syntaxhighlighter/highlighter.cpp</span>
<!-- $$$richtext/syntaxhighlighter/highlighter.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &quot;highlighter.h&quot;</span>

  Highlighter<span class="operator">::</span>Highlighter(<span class="type"><a href="../qtgui/qtextdocument.html">QTextDocument</a></span> <span class="operator">*</span>parent)
      : <span class="type"><a href="../qtgui/qsyntaxhighlighter.html">QSyntaxHighlighter</a></span>(parent)
  {
      HighlightingRule rule;

      keywordFormat<span class="operator">.</span>setForeground(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>darkBlue);
      keywordFormat<span class="operator">.</span>setFontWeight(<span class="type"><a href="../qtgui/qfont.html">QFont</a></span><span class="operator">::</span>Bold);
      <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> keywordPatterns;
      keywordPatterns <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bchar\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bclass\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bconst\\b&quot;</span>
                      <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bdouble\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\benum\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bexplicit\\b&quot;</span>
                      <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bfriend\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\binline\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bint\\b&quot;</span>
                      <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\blong\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bnamespace\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\boperator\\b&quot;</span>
                      <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bprivate\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bprotected\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bpublic\\b&quot;</span>
                      <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bshort\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bsignals\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bsigned\\b&quot;</span>
                      <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bslots\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bstatic\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bstruct\\b&quot;</span>
                      <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\btemplate\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\btypedef\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\btypename\\b&quot;</span>
                      <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bunion\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bunsigned\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bvirtual\\b&quot;</span>
                      <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bvoid\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bvolatile\\b&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\\bbool\\b&quot;</span>;
      foreach (<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>pattern<span class="operator">,</span> keywordPatterns) {
          rule<span class="operator">.</span>pattern <span class="operator">=</span> <span class="type"><a href="../qtcore/qregularexpression.html">QRegularExpression</a></span>(pattern);
          rule<span class="operator">.</span>format <span class="operator">=</span> keywordFormat;
          highlightingRules<span class="operator">.</span>append(rule);
      }

      classFormat<span class="operator">.</span>setFontWeight(<span class="type"><a href="../qtgui/qfont.html">QFont</a></span><span class="operator">::</span>Bold);
      classFormat<span class="operator">.</span>setForeground(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>darkMagenta);
      rule<span class="operator">.</span>pattern <span class="operator">=</span> <span class="type"><a href="../qtcore/qregularexpression.html">QRegularExpression</a></span>(<span class="string">&quot;\\bQ[A-Za-z]+\\b&quot;</span>);
      rule<span class="operator">.</span>format <span class="operator">=</span> classFormat;
      highlightingRules<span class="operator">.</span>append(rule);

      singleLineCommentFormat<span class="operator">.</span>setForeground(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>red);
      rule<span class="operator">.</span>pattern <span class="operator">=</span> <span class="type"><a href="../qtcore/qregularexpression.html">QRegularExpression</a></span>(<span class="string">&quot;//[^\n]*&quot;</span>);
      rule<span class="operator">.</span>format <span class="operator">=</span> singleLineCommentFormat;
      highlightingRules<span class="operator">.</span>append(rule);

      multiLineCommentFormat<span class="operator">.</span>setForeground(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>red);

      quotationFormat<span class="operator">.</span>setForeground(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>darkGreen);
      rule<span class="operator">.</span>pattern <span class="operator">=</span> <span class="type"><a href="../qtcore/qregularexpression.html">QRegularExpression</a></span>(<span class="string">&quot;\&quot;.*\&quot;&quot;</span>);
      rule<span class="operator">.</span>format <span class="operator">=</span> quotationFormat;
      highlightingRules<span class="operator">.</span>append(rule);

      functionFormat<span class="operator">.</span>setFontItalic(<span class="keyword">true</span>);
      functionFormat<span class="operator">.</span>setForeground(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>blue);
      rule<span class="operator">.</span>pattern <span class="operator">=</span> <span class="type"><a href="../qtcore/qregularexpression.html">QRegularExpression</a></span>(<span class="string">&quot;\\b[A-Za-z0-9_]+(?=\\()&quot;</span>);
      rule<span class="operator">.</span>format <span class="operator">=</span> functionFormat;
      highlightingRules<span class="operator">.</span>append(rule);

      commentStartExpression <span class="operator">=</span> <span class="type"><a href="../qtcore/qregularexpression.html">QRegularExpression</a></span>(<span class="string">&quot;/\\*&quot;</span>);
      commentEndExpression <span class="operator">=</span> <span class="type"><a href="../qtcore/qregularexpression.html">QRegularExpression</a></span>(<span class="string">&quot;\\*/&quot;</span>);
  }

  <span class="type">void</span> Highlighter<span class="operator">::</span>highlightBlock(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>text)
  {
      foreach (<span class="keyword">const</span> HighlightingRule <span class="operator">&amp;</span>rule<span class="operator">,</span> highlightingRules) {
          <span class="type"><a href="../qtcore/qregularexpressionmatchiterator.html">QRegularExpressionMatchIterator</a></span> matchIterator <span class="operator">=</span> rule<span class="operator">.</span>pattern<span class="operator">.</span>globalMatch(text);
          <span class="keyword">while</span> (matchIterator<span class="operator">.</span>hasNext()) {
              <span class="type"><a href="../qtcore/qregularexpressionmatch.html">QRegularExpressionMatch</a></span> match <span class="operator">=</span> matchIterator<span class="operator">.</span>next();
              setFormat(match<span class="operator">.</span>capturedStart()<span class="operator">,</span> match<span class="operator">.</span>capturedLength()<span class="operator">,</span> rule<span class="operator">.</span>format);
          }
      }
      setCurrentBlockState(<span class="number">0</span>);

      <span class="type">int</span> startIndex <span class="operator">=</span> <span class="number">0</span>;
      <span class="keyword">if</span> (previousBlockState() <span class="operator">!</span><span class="operator">=</span> <span class="number">1</span>)
          startIndex <span class="operator">=</span> text<span class="operator">.</span>indexOf(commentStartExpression);

      <span class="keyword">while</span> (startIndex <span class="operator">&gt;</span><span class="operator">=</span> <span class="number">0</span>) {
          <span class="type"><a href="../qtcore/qregularexpressionmatch.html">QRegularExpressionMatch</a></span> match <span class="operator">=</span> commentEndExpression<span class="operator">.</span>match(text<span class="operator">,</span> startIndex);
          <span class="type">int</span> endIndex <span class="operator">=</span> match<span class="operator">.</span>capturedStart();
          <span class="type">int</span> commentLength <span class="operator">=</span> <span class="number">0</span>;
          <span class="keyword">if</span> (endIndex <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) {
              setCurrentBlockState(<span class="number">1</span>);
              commentLength <span class="operator">=</span> text<span class="operator">.</span>length() <span class="operator">-</span> startIndex;
          } <span class="keyword">else</span> {
              commentLength <span class="operator">=</span> endIndex <span class="operator">-</span> startIndex
                              <span class="operator">+</span> match<span class="operator">.</span>capturedLength();
          }
          setFormat(startIndex<span class="operator">,</span> commentLength<span class="operator">,</span> multiLineCommentFormat);
          startIndex <span class="operator">=</span> text<span class="operator">.</span>indexOf(commentStartExpression<span class="operator">,</span> startIndex <span class="operator">+</span> commentLength);
      }
  }

</pre>
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<!-- @@@richtext/syntaxhighlighter/highlighter.cpp -->
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