src_gui_text_qsyntaxhighlighter.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QChar>
#include <QList>
#include <QRegularExpression>
#include <QSyntaxHighlighter>
#include <QTextBlockUserData>
#include <QTextEdit>
#include <QTextObject>
 
namespace src_gui_text_qsyntaxhighlighter {
struct MyHighlighter : public QSyntaxHighlighter
{
    explicit MyHighlighter(QTextDocument *document) : QSyntaxHighlighter(document) { Q_UNUSED(document); }
 
    void highlightBlock(const QString &text);
    void wrapper();
 
    QString text;
};
 
//! [0]
QTextEdit *editor = new QTextEdit;
MyHighlighter *highlighter = new MyHighlighter(editor->document());
//! [0]
 
 
//! [1]
void MyHighlighter::highlightBlock(const QString &text)
{
    QTextCharFormat myClassFormat;
    myClassFormat.setFontWeight(QFont::Bold);
    myClassFormat.setForeground(Qt::darkMagenta);
 
    QRegularExpression expression("\\bMy[A-Za-z]+\\b");
    QRegularExpressionMatchIterator i = expression.globalMatch(text);
    while (i.hasNext()) {
        QRegularExpressionMatch match = i.next();
        setFormat(match.capturedStart(), match.capturedLength(), myClassFormat);
    }
}
//! [1]
 
void MyHighlighter::wrapper() {
//! [2]
QTextCharFormat multiLineCommentFormat;
multiLineCommentFormat.setForeground(Qt::red);
 
QRegularExpression startExpression("/\\*");
QRegularExpression endExpression("\\*/");
 
setCurrentBlockState(0);
 
int startIndex = 0;
if (previousBlockState() != 1)
    startIndex = text.indexOf(startExpression);
 
while (startIndex >= 0) {
    QRegularExpressionMatch endMatch;
    int endIndex = text.indexOf(endExpression, startIndex, &endMatch);
    int commentLength;
    if (endIndex == -1) {
        setCurrentBlockState(1);
        commentLength = text.length() - startIndex;
    } else {
        commentLength = endIndex - startIndex
                        + endMatch.capturedLength();
    }
    setFormat(startIndex, commentLength, multiLineCommentFormat);
    startIndex = text.indexOf(startExpression,
                              startIndex + commentLength);
}
//! [2]
} // MyHighlighter::wrapper
 
 
//! [3]
struct ParenthesisInfo
{
    QChar character;
    int position;
};
 
struct BlockData : public QTextBlockUserData
{
    QList<ParenthesisInfo> parentheses;
};
//! [3]
 
} // src_gui_text_qsyntaxhighlighter