CppHighlighter.cpp

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/*
* This file is part of ArmarX.
*
* ArmarX is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* ArmarX is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @package    ArmarX::
* @author     Mirko Waechter ( mirko.waechter at kit dot edu)
* @date       2014
* @copyright  http://www.gnu.org/licenses/gpl-2.0.txt
*             GNU General Public License
*/
 
#include "CppHighlighter.h"
 
namespace armarx
{
 
 
    CppHighlighter::CppHighlighter(QTextDocument* parent)
        : QSyntaxHighlighter(parent)
    {
        HighlightingRule rule;
 
        keywordFormat.setForeground(Qt::darkBlue);
        keywordFormat.setFontWeight(QFont::Bold);
        QStringList keywordPatterns;
        keywordPatterns << "\\bfor\\b" << "\\bwhile\\b" << "\\bif\\b" << "\\bchar\\b"
                        << "\\bclass\\b" << "\\bconst\\b" << "\\breturn\\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 (const QString& pattern, keywordPatterns)
        {
            rule.pattern = QRegExp(pattern);
            rule.format = keywordFormat;
            highlightingRules.append(rule);
        }
 
        classFormat.setFontWeight(QFont::Bold);
        classFormat.setForeground(Qt::darkMagenta);
        rule.pattern = QRegExp("\\bQ[A-Za-z]+\\b");
        rule.format = classFormat;
        highlightingRules.append(rule);
 
        singleLineCommentFormat.setForeground(Qt::red);
        rule.pattern = QRegExp("//[^\n]*");
        rule.format = singleLineCommentFormat;
        highlightingRules.append(rule);
 
        multiLineCommentFormat.setForeground(Qt::red);
 
        quotationFormat.setForeground(Qt::darkGreen);
        rule.pattern = QRegExp("\".*\"");
        rule.format = quotationFormat;
        highlightingRules.append(rule);
 
        functionFormat.setFontItalic(true);
        functionFormat.setForeground(Qt::blue);
        rule.pattern = QRegExp("\\b[A-Za-z0-9_]+(?=\\()");
        rule.format = functionFormat;
        highlightingRules.append(rule);
 
        commentStartExpression = QRegExp("/\\*");
        commentEndExpression = QRegExp("\\*/");
    }
 
    void CppHighlighter::highlightBlock(const QString& text)
    {
        foreach (const HighlightingRule& rule, highlightingRules)
        {
            QRegExp expression(rule.pattern);
            int index = expression.indexIn(text);
 
            while (index >= 0)
            {
                int length = expression.matchedLength();
                setFormat(index, length, rule.format);
                index = expression.indexIn(text, index + length);
            }
        }
        setCurrentBlockState(0);
 
        int startIndex = 0;
 
        if (previousBlockState() != 1)
        {
            startIndex = commentStartExpression.indexIn(text);
        }
 
        while (startIndex >= 0)
        {
            int endIndex = commentEndExpression.indexIn(text, startIndex);
            int commentLength;
 
            if (endIndex == -1)
            {
                setCurrentBlockState(1);
                commentLength = text.length() - startIndex;
            }
            else
            {
                commentLength = endIndex - startIndex
                                + commentEndExpression.matchedLength();
            }
 
            setFormat(startIndex, commentLength, multiLineCommentFormat);
            startIndex = commentStartExpression.indexIn(text, startIndex + commentLength);
        }
    }
} // namespace armarx