XML To FastInfoset Converter Example

/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 Digia Plc and its Subsidiary(-ies) 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "xmlsyntaxhighlighter.h"

XmlSyntaxHighlighter::XmlSyntaxHighlighter(QTextDocument *parent)
    : QSyntaxHighlighter(parent)
{
    HighlightingRule rule;

    // tag format
    tagFormat.setForeground(Qt::darkBlue);
    tagFormat.setFontWeight(QFont::Bold);
    rule.pattern = QRegularExpression(QLatin1String("(<[a-zA-Z:\\-]+\\b|<\\?[a-zA-Z:\\-]+\\b|<\\![a-zA-Z:\\-]+\\b|\\?>|>|/>|</[a-zA-Z:\\-]+>)"));
    rule.format = tagFormat;
    highlightingRules.append(rule);

    // attribute format
    attributeFormat.setForeground(Qt::darkGreen);
    rule.pattern = QRegularExpression(QLatin1String("[a-zA-Z:\\-]+="));
    rule.format = attributeFormat;
    highlightingRules.append(rule);

    // attribute content format
    attributeContentFormat.setForeground(Qt::red);
    rule.pattern = QRegularExpression(QLatin1String("(\"[^\"]*\"|'[^']*')"));
    rule.format = attributeContentFormat;
    highlightingRules.append(rule);

    commentFormat.setForeground(Qt::lightGray);
    commentFormat.setFontItalic(true);

    commentStartExpression = QRegularExpression(QLatin1String("<!--"));
    commentEndExpression = QRegularExpression(QLatin1String("-->"));
}

void XmlSyntaxHighlighter::highlightBlock(const QString &text)
{
     foreach (const HighlightingRule &rule, highlightingRules) {
         QRegularExpressionMatchIterator matchIterator = rule.pattern.globalMatch(text);
         while (matchIterator.hasNext())
         {
             QRegularExpressionMatch match = matchIterator.next();
             setFormat(match.capturedStart(), match.capturedLength(), rule.format);
         }
     }
     setCurrentBlockState(0);

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

     while (startIndex >= 0)
     {
         QRegularExpressionMatch match = commentEndExpression.match(text, startIndex);
         int endIndex = match.capturedStart();
         int commentLength = 0;
         if (endIndex == -1)
         {
             setCurrentBlockState(1);
             commentLength = text.length() - startIndex;
         }
         else
         {
             commentLength = endIndex - startIndex + match.capturedLength();
         }
         setFormat(startIndex, commentLength, commentFormat);
         startIndex = text.indexOf(commentStartExpression, startIndex + commentLength);
     }
}