main.cpp

#include <QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

mainwindow.cpp

#include "mainwindow.h"
#include "scadlexer.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    qsci = new QsciScintilla;
    setCentralWidget(qsci);
    ScadLexer * lexer = new ScadLexer(this);
    qsci->setLexer(lexer);
    lexer->setFont( QFont("Courier New") );

    qsci->setCaretLineVisible(true);
    qsci->setCaretLineBackgroundColor(QColor("gainsboro"));

    qsci->setAutoIndent(true);
    qsci->setIndentationWidth(4);

    qsci->setMarginsBackgroundColor(QColor("gainsboro"));
    qsci->setMarginLineNumbers(1, true);
    qsci->setMarginWidth(1, 50);

    qsci->setBraceMatching(QsciScintilla::SloppyBraceMatch);
    qsci->setMatchedBraceBackgroundColor(Qt::yellow);
    qsci->setUnmatchedBraceForegroundColor(Qt::blue);
}

MainWindow::~MainWindow()
{
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <Qsci/qsciscintilla.h>

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    QsciScintilla *qsci;
};

#endif
~             

scadLexer-demo-pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = scadlexer-demo
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp \
    scadlexer.cpp

HEADERS  += mainwindow.h \
    scadlexer.h

LIBS += -lqscintilla2

scadlexer.cpp

#include "scadlexer.h"
#include <Qsci/qsciscintilla.h>

ScadLexer::ScadLexer(QObject *parent) :
    QsciLexerCustom(parent)
{
    keywordsList << "if" << "else"  << "cirlce" << "sphere" <<
                    "function"  << "module"  << "use" << "cylinder"  <<
                    "include";
}

ScadLexer::~ScadLexer()
{;
}


void ScadLexer::styleText(int start, int end)
{
    if(!editor())
        return;


    char * data = new char[end - start + 1];

    editor()->SendScintilla(QsciScintilla::SCI_GETTEXTRANGE, start, end, data);
    QString source(data);
    delete [] data;
    if(source.isEmpty())
        return;


    highlightKeywords(source, start);
}

void ScadLexer::highlightKeywords(const QString &source, int start)
{
    foreach(QString word, keywordsList) {
        if(source.contains(word)) {
 int p = source.count(word);
            int index = 0;
            while(p != 0) {
                int begin = source.indexOf(word, index);
                index = begin+1;

                startStyling(start + begin);
                setStyling(word.length(), Keyword);
                startStyling(start + begin);

                p--;
            }
        }
    }
}

QColor ScadLexer::defaultColor(int style) const
{
    switch(style) {
        case Keyword:
            return Qt::blue;
    }
    return Qt::black;
}

QString ScadLexer::description(int style) const
{
    switch(style) {
        case Default:
            return "Default";
        case Keyword:
            return "Keyword";
    }
    return QString(style);
}

const char * ScadLexer::language() const
{
    return "SCAD";
}

scadlexer.h

#ifndef QSCILEXERASM_H
#define QSCILEXERASM_H
#include<Qsci/qscilexercustom.h>

class ScadLexer : public QsciLexerCustom
{
    Q_OBJECT
public:
    explicit ScadLexer(QObject *parent = 0);
    ~ScadLexer();

    void styleText(int start, int end);

    void highlightKeywords(const QString &source, int start);

    const char * language() const;

    QColor defaultColor(int style) const;

    QString description(int style) const;


    enum {
        Default = 0,
        Comment = 1,
        Keyword = 2
    };
private:
    ScadLexer(const ScadLexer &);
    ScadLexer &operator=(const ScadLexer &);
    QStringList keywordsList;

};

#endif