/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/

#include "xmlsyntaxhighlighter.h"

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

    // tag format
    tagFormat.setForeground(Qt::darkBlue);
    tagFormat.setFontWeight(QFont::Bold);
    rule.pattern = QRegExp("(<[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 = QRegExp("[a-zA-Z:]+=");
    rule.format = attributeFormat;
    highlightingRules.append(rule);

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

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

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

void XmlSyntaxHighlighter::highlightBlock(const QString &text)
{
     foreach (const HighlightingRule &rule, highlightingRules) {
         QRegExp expression(rule.pattern);
         int index = text.indexOf(expression);
         while (index >= 0) {
             int length = expression.matchedLength();
             setFormat(index, length, rule.format);
             index = text.indexOf(expression, index + length);
         }
     }
     setCurrentBlockState(0);

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

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