path: root/src/gui/doc/snippets/code/src_gui_text_qsyntaxhighlighter.cpp

// 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 {explicitMyHighlighter(QTextDocument *document) :QSyntaxHighlighter(document) {Q_UNUSED(document); }voidhighlightBlock(const QString &text);voidwrapper(); QString text;};//! [0] QTextEdit *editor =new QTextEdit; MyHighlighter *highlighter =newMyHighlighter(editor->document());//! [0]//! [1]voidMyHighlighter::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]voidMyHighlighter::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