#include "mainwindow.h"
#include <QApplication>
#include <QTextEdit>
#include <qsyntaxhighlighter.h>
#include <QSyntaxHighlighter>
#include <QRegularExpressionMatchIterator>


class highlighter: public QSyntaxHighlighter
{
public:
    highlighter(QTextDocument *parent = nullptr):QSyntaxHighlighter(parent)
    {

    }

    void highlightBlock(const QString &text)
    {
        QVector<HighlightingRule> Rules;

        QTextCharFormat numbers;
        numbers.setFontWeight(QFont::Bold);
        numbers.setForeground(Qt::darkGreen);
        QStringList numbersPattern;
        numbersPattern << "0" << "1"<< "2"<< "3"<< "4"<< "5"<< "6"<< "7"<< "8"<< "9";
        foreach (const QString &pattern, numbersPattern)
        {
                rule.pattern = QRegularExpression(pattern);
                rule.format = numbers;
                Rules.append(rule);
        }

        QTextCharFormat marks;
        marks.setFontWeight(QFont::Bold);
        marks.setForeground(Qt::red);
        QStringList marksPattern;
        marksPattern << "\\!" << "\\." << "\\," << "\\?" << "\\:" << "\\;";
        foreach (const QString &pattern, marksPattern)
        {
                rule.pattern = QRegularExpression(pattern);
                rule.format = marks;
                Rules.append(rule);
        }

        foreach (const HighlightingRule &rule, Rules)
        {
                QRegularExpressionMatchIterator matchIterator = rule.pattern.globalMatch(text);
                while (matchIterator.hasNext())
                {
                    QRegularExpressionMatch match = matchIterator.next();
                    setFormat(match.capturedStart(), match.capturedLength(), rule.format);
                }
        }
    }
private:
    struct HighlightingRule
        {
            QRegularExpression pattern;
            QTextCharFormat format;
        };
    HighlightingRule rule;
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QTextEdit text;
    text.setMinimumSize(600,480);
    text.setFontPointSize(18);
    text.setFontFamily("Helvetica");

    highlighter hl(text.document());
    text.show();

    return a.exec();
}