syntaxhighlighter.cpp

/*
  Copyright (c) 2016 Sergio Martins <iamsergio@gmail.com>

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program 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, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

  As a special exception, permission is given to link this program
  with any edition of Qt, and distribute the resulting executable,
  without including the source code for Qt in the source distribution.
*/

#include "syntaxhighlighter.h"

#include <QDebug>
#include <QRegularExpression>

SyntaxHighlighter::SyntaxHighlighter(QTextDocument *parent)
    : QSyntaxHighlighter(parent)
{
}

void SyntaxHighlighter::setTokens(const QStringList &tokens)
{
    if (m_tokens != tokens) {
        m_tokens = tokens;
        rehighlight();
    }
}

void SyntaxHighlighter::highlightBlock(const QString &text)
{
    QTextCharFormat myClassFormat;
    myClassFormat.setFontWeight(QFont::Bold);
    myClassFormat.setForeground(Qt::darkBlue);
    myClassFormat.setBackground(Qt::yellow);

    for (const auto &token : m_tokens) {
        if (token.isEmpty())
            continue;

        QRegularExpression expression(token, QRegularExpression::CaseInsensitiveOption);
        QRegularExpressionMatchIterator iterator = expression.globalMatch(text);
        while (iterator.hasNext()) {
            QRegularExpressionMatch match = iterator.next();
            setFormat(match.capturedStart(), match.capturedLength(), myClassFormat);
        }
    }
}