|  | Home · All Classes · Main Classes · Grouped Classes · Modules · Functions |

# highlighter.cpp Example File
richtext/syntaxhighlighter/highlighter.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
        ** License version 2.0 as published by the Free Software Foundation
        ** and appearing in the file LICENSE.GPL included in the packaging of
        ** this file.  Please review the following information to ensure GNU
        ** General Public Licensing requirements will be met:
        ** http://www.trolltech.com/products/qt/opensource.html
        **
        ** If you are unsure which license is appropriate for your use, please
        ** review the following information:
        ** http://www.trolltech.com/products/qt/licensing.html or contact the
        ** sales department at sales@trolltech.com.
        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        **
        ****************************************************************************/

        #include <QtGui>

        #include "highlighter.h"

        Highlighter::Highlighter(QTextDocument *parent)
            : QSyntaxHighlighter(parent)
        {
            QTextCharFormat keywordFormat;
            keywordFormat.setForeground(Qt::darkBlue);
            keywordFormat.setFontWeight(QFont::Bold);
            QStringList keywordPatterns;
            keywordPatterns << "\\bchar\\b" << "\\bclass\\b" << "\\bconst\\b" << "\\bdouble\\b"
                            << "\\benum\\b" << "\\bexplicit\\b" << "\\bfriend\\b" << "\\binline\\b"
                            << "\\bint\\b" << "\\blong\\b" << "\\bnamespace\\b" << "\\boperator\\b"
                            << "\\bprivate\\b" << "\\bprotected\\b" << "\\bpublic\\b"
                            << "\\bshort\\b" << "\\bsignals\\b" << "\\bsigned\\b"
                            << "\\bslots\\b" << "\\bstatic\\b" << "\\bstruct\\b" << "\\btemplate\\b"
                            << "\\btypedef\\b" << "\\btypename\\b" << "\\bunion\\b" << "\\bunsigned\\b"
                            << "\\bvirtual\\b"<< "\\bvoid\\b" << "\\bvolatile\\b";
            foreach (QString pattern, keywordPatterns)
                mappings[pattern] = keywordFormat;

            QTextCharFormat classFormat;
            classFormat.setFontWeight(QFont::Bold);
            classFormat.setForeground(Qt::darkMagenta);
            mappings["\\bQ[A-Za-z]+\\b"] = classFormat;

            QTextCharFormat singleLineCommentFormat;
            singleLineCommentFormat.setForeground(Qt::red);
            mappings["//[^\n]*"] = singleLineCommentFormat;

            multiLineCommentFormat.setForeground(Qt::red);

            QTextCharFormat quotationFormat;
            quotationFormat.setForeground(Qt::darkGreen);
            mappings["\".*\""] = quotationFormat;

            QTextCharFormat functionFormat;
            functionFormat.setFontItalic(true);
            functionFormat.setForeground(Qt::blue);
            mappings["\\b[A-Za-z0-9_]+\\(.*\\)"] = functionFormat;
        }

        void Highlighter::highlightBlock(const QString &text)
        {
            foreach (QString pattern, mappings.keys()) {
                QRegExp expression(pattern);
                int index = text.indexOf(expression);
                while (index >= 0) {
                    int length = expression.matchedLength();
                    setFormat(index, length, mappings[pattern]);
                    index = text.indexOf(expression, index + length);
                }
            }
            setCurrentBlockState(0);

            QRegExp startExpression( "/\\*");
            QRegExp endExpression("\\*/");

            int startIndex = 0;
            if (previousBlockState() != 1)
                startIndex = text.indexOf(startExpression);

            while (startIndex >= 0) {
               int endIndex = text.indexOf(endExpression, startIndex);
               int commentLength;
               if (endIndex == -1) {
                   setCurrentBlockState(1);
                   commentLength = text.length() - startIndex;
               } else {
                   commentLength = endIndex - startIndex + endExpression.matchedLength();
               }
               setFormat(startIndex, commentLength, multiLineCommentFormat);
               startIndex = text.indexOf(startExpression, startIndex + commentLength);
            }
        }