qt 6.5.1 original

examples/widgets/richtext/syntaxhighlighter/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(syntaxhighlighter LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/richtext/syntaxhighlighter")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(syntaxhighlighter
+    highlighter.cpp highlighter.h
+    main.cpp
+    mainwindow.cpp mainwindow.h
+)
+
+set_target_properties(syntaxhighlighter PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(syntaxhighlighter PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+install(TARGETS syntaxhighlighter
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/widgets/richtext/syntaxhighlighter/highlighter.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "highlighter.h"
+
+//! [0]
+Highlighter::Highlighter(QTextDocument *parent)
+    : QSyntaxHighlighter(parent)
+{
+    HighlightingRule rule;
+
+    keywordFormat.setForeground(Qt::darkBlue);
+    keywordFormat.setFontWeight(QFont::Bold);
+    const QString keywordPatterns[] = {
+        QStringLiteral("\\bchar\\b"), QStringLiteral("\\bclass\\b"), QStringLiteral("\\bconst\\b"),
+        QStringLiteral("\\bdouble\\b"), QStringLiteral("\\benum\\b"), QStringLiteral("\\bexplicit\\b"),
+        QStringLiteral("\\bfriend\\b"), QStringLiteral("\\binline\\b"), QStringLiteral("\\bint\\b"),
+        QStringLiteral("\\blong\\b"), QStringLiteral("\\bnamespace\\b"), QStringLiteral("\\boperator\\b"),
+        QStringLiteral("\\bprivate\\b"), QStringLiteral("\\bprotected\\b"), QStringLiteral("\\bpublic\\b"),
+        QStringLiteral("\\bshort\\b"), QStringLiteral("\\bsignals\\b"), QStringLiteral("\\bsigned\\b"),
+        QStringLiteral("\\bslots\\b"), QStringLiteral("\\bstatic\\b"), QStringLiteral("\\bstruct\\b"),
+        QStringLiteral("\\btemplate\\b"), QStringLiteral("\\btypedef\\b"), QStringLiteral("\\btypename\\b"),
+        QStringLiteral("\\bunion\\b"), QStringLiteral("\\bunsigned\\b"), QStringLiteral("\\bvirtual\\b"),
+        QStringLiteral("\\bvoid\\b"), QStringLiteral("\\bvolatile\\b"), QStringLiteral("\\bbool\\b")
+    };
+    for (const QString &pattern : keywordPatterns) {
+        rule.pattern = QRegularExpression(pattern);
+        rule.format = keywordFormat;
+        highlightingRules.append(rule);
+//! [0] //! [1]
+    }
+//! [1]
+
+//! [2]
+    classFormat.setFontWeight(QFont::Bold);
+    classFormat.setForeground(Qt::darkMagenta);
+    rule.pattern = QRegularExpression(QStringLiteral("\\bQ[A-Za-z]+\\b"));
+    rule.format = classFormat;
+    highlightingRules.append(rule);
+//! [2]
+
+//! [3]
+    singleLineCommentFormat.setForeground(Qt::red);
+    rule.pattern = QRegularExpression(QStringLiteral("//[^\n]*"));
+    rule.format = singleLineCommentFormat;
+    highlightingRules.append(rule);
+
+    multiLineCommentFormat.setForeground(Qt::red);
+//! [3]
+
+//! [4]
+    quotationFormat.setForeground(Qt::darkGreen);
+    rule.pattern = QRegularExpression(QStringLiteral("\".*\""));
+    rule.format = quotationFormat;
+    highlightingRules.append(rule);
+//! [4]
+
+//! [5]
+    functionFormat.setFontItalic(true);
+    functionFormat.setForeground(Qt::blue);
+    rule.pattern = QRegularExpression(QStringLiteral("\\b[A-Za-z0-9_]+(?=\\()"));
+    rule.format = functionFormat;
+    highlightingRules.append(rule);
+//! [5]
+
+//! [6]
+    commentStartExpression = QRegularExpression(QStringLiteral("/\\*"));
+    commentEndExpression = QRegularExpression(QStringLiteral("\\*/"));
+}
+//! [6]
+
+//! [7]
+void Highlighter::highlightBlock(const QString &text)
+{
+    for (const HighlightingRule &rule : std::as_const(highlightingRules)) {
+        QRegularExpressionMatchIterator matchIterator = rule.pattern.globalMatch(text);
+        while (matchIterator.hasNext()) {
+            QRegularExpressionMatch match = matchIterator.next();
+            setFormat(match.capturedStart(), match.capturedLength(), rule.format);
+        }
+    }
+//! [7] //! [8]
+    setCurrentBlockState(0);
+//! [8]
+
+//! [9]
+    int startIndex = 0;
+    if (previousBlockState() != 1)
+        startIndex = text.indexOf(commentStartExpression);
+
+//! [9] //! [10]
+    while (startIndex >= 0) {
+//! [10] //! [11]
+        QRegularExpressionMatch match = commentEndExpression.match(text, startIndex);
+        int endIndex = match.capturedStart();
+        int commentLength = 0;
+        if (endIndex == -1) {
+            setCurrentBlockState(1);
+            commentLength = text.length() - startIndex;
+        } else {
+            commentLength = endIndex - startIndex
+                            + match.capturedLength();
+        }
+        setFormat(startIndex, commentLength, multiLineCommentFormat);
+        startIndex = text.indexOf(commentStartExpression, startIndex + commentLength);
+    }
+}
+//! [11]

examples/widgets/richtext/syntaxhighlighter/highlighter.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef HIGHLIGHTER_H
+#define HIGHLIGHTER_H
+
+#include <QSyntaxHighlighter>
+#include <QTextCharFormat>
+#include <QRegularExpression>
+
+QT_BEGIN_NAMESPACE
+class QTextDocument;
+QT_END_NAMESPACE
+
+//! [0]
+class Highlighter : public QSyntaxHighlighter
+{
+    Q_OBJECT
+
+public:
+    Highlighter(QTextDocument *parent = nullptr);
+
+protected:
+    void highlightBlock(const QString &text) override;
+
+private:
+    struct HighlightingRule
+    {
+        QRegularExpression pattern;
+        QTextCharFormat format;
+    };
+    QList<HighlightingRule> highlightingRules;
+
+    QRegularExpression commentStartExpression;
+    QRegularExpression commentEndExpression;
+
+    QTextCharFormat keywordFormat;
+    QTextCharFormat classFormat;
+    QTextCharFormat singleLineCommentFormat;
+    QTextCharFormat multiLineCommentFormat;
+    QTextCharFormat quotationFormat;
+    QTextCharFormat functionFormat;
+};
+//! [0]
+
+#endif // HIGHLIGHTER_H

examples/widgets/richtext/syntaxhighlighter/main.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "mainwindow.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    MainWindow window;
+    window.resize(640, 512);
+    window.show();
+    return app.exec();
+}

examples/widgets/richtext/syntaxhighlighter/mainwindow.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QtWidgets>
+
+#include "mainwindow.h"
+
+//! [0]
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent)
+{
+    setupFileMenu();
+    setupHelpMenu();
+    setupEditor();
+
+    setCentralWidget(editor);
+    setWindowTitle(tr("Syntax Highlighter"));
+}
+//! [0]
+
+void MainWindow::about()
+{
+    QMessageBox::about(this, tr("About Syntax Highlighter"),
+                tr("<p>The <b>Syntax Highlighter</b> example shows how " \
+                   "to perform simple syntax highlighting by subclassing " \
+                   "the QSyntaxHighlighter class and describing " \
+                   "highlighting rules using regular expressions.</p>"));
+}
+
+void MainWindow::newFile()
+{
+    editor->clear();
+}
+
+void MainWindow::openFile(const QString &path)
+{
+    QString fileName = path;
+
+    if (fileName.isNull())
+        fileName = QFileDialog::getOpenFileName(this, tr("Open File"), "", "C++ Files (*.cpp *.h)");
+
+    if (!fileName.isEmpty()) {
+        QFile file(fileName);
+        if (file.open(QFile::ReadOnly | QFile::Text))
+            editor->setPlainText(file.readAll());
+    }
+}
+
+//! [1]
+void MainWindow::setupEditor()
+{
+    QFont font;
+    font.setFamily("Courier");
+    font.setFixedPitch(true);
+    font.setPointSize(10);
+
+    editor = new QTextEdit;
+    editor->setFont(font);
+
+    highlighter = new Highlighter(editor->document());
+
+    QFile file("mainwindow.h");
+    if (file.open(QFile::ReadOnly | QFile::Text))
+        editor->setPlainText(file.readAll());
+}
+//! [1]
+
+void MainWindow::setupFileMenu()
+{
+    QMenu *fileMenu = new QMenu(tr("&File"), this);
+    menuBar()->addMenu(fileMenu);
+
+    fileMenu->addAction(tr("&New"), QKeySequence::New,
+                        this, &MainWindow::newFile);
+    fileMenu->addAction(tr("&Open..."), QKeySequence::Open,
+                        this, [this](){ openFile(); });
+    fileMenu->addAction(tr("E&xit"), QKeySequence::Quit,
+                        qApp, &QApplication::quit);
+}
+
+void MainWindow::setupHelpMenu()
+{
+    QMenu *helpMenu = new QMenu(tr("&Help"), this);
+    menuBar()->addMenu(helpMenu);
+
+    helpMenu->addAction(tr("&About"), this, &MainWindow::about);
+    helpMenu->addAction(tr("About &Qt"), qApp, &QApplication::aboutQt);
+}

examples/widgets/richtext/syntaxhighlighter/mainwindow.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include "highlighter.h"
+
+#include <QMainWindow>
+
+QT_BEGIN_NAMESPACE
+class QTextEdit;
+QT_END_NAMESPACE
+
+//! [0]
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow(QWidget *parent = nullptr);
+
+public slots:
+    void about();
+    void newFile();
+    void openFile(const QString &path = QString());
+
+private:
+    void setupEditor();
+    void setupFileMenu();
+    void setupHelpMenu();
+
+    QTextEdit *editor;
+    Highlighter *highlighter;
+};
+//! [0]
+
+#endif // MAINWINDOW_H

examples/widgets/richtext/syntaxhighlighter/syntaxhighlighter.pro

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+QT += widgets
+requires(qtConfig(filedialog))
+
+HEADERS         = highlighter.h \
+                  mainwindow.h
+SOURCES         = highlighter.cpp \
+                  mainwindow.cpp \
+                  main.cpp
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/richtext/syntaxhighlighter
+INSTALLS += target