<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>highlighter.cpp Example File | Qt Widgets 5.9</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.9</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-richtext-syntaxhighlighter-example.html">Syntax Highlighter Example</a></td><td >highlighter.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <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: ** ** "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 ** "AS IS" 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." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include "highlighter.h"</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"><</span><span class="operator"><</span> <span class="string">"\\bchar\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bclass\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bconst\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bdouble\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\benum\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bexplicit\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bfriend\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\binline\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bint\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\blong\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bnamespace\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\boperator\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bprivate\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bprotected\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bpublic\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bshort\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bsignals\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bsigned\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bslots\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bstatic\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bstruct\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\btemplate\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\btypedef\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\btypename\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bunion\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bunsigned\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bvirtual\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bvoid\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bvolatile\\b"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"\\bbool\\b"</span>; foreach (<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</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">"\\bQ[A-Za-z]+\\b"</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">"//[^\n]*"</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">"\".*\""</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">"\\b[A-Za-z0-9_]+(?=\\()"</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">"/\\*"</span>); commentEndExpression <span class="operator">=</span> <span class="type"><a href="../qtcore/qregularexpression.html">QRegularExpression</a></span>(<span class="string">"\\*/"</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">&</span>text) { foreach (<span class="keyword">const</span> HighlightingRule <span class="operator">&</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">></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> </div> <!-- @@@richtext/syntaxhighlighter/highlighter.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>