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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
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