qt 6.5.1 original

tests/auto/gui/text/qtextmarkdownwriter/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## tst_qtextmarkdownwriter Test:
+#####################################################################
+
+# Collect test data
+list(APPEND test_data "data/example.md")
+list(APPEND test_data "data/blockquotes.md")
+
+qt_internal_add_test(tst_qtextmarkdownwriter
+    SOURCES
+        tst_qtextmarkdownwriter.cpp
+    LIBRARIES
+        Qt::CorePrivate
+        Qt::Gui
+        Qt::GuiPrivate
+    TESTDATA ${test_data}
+)

tests/auto/gui/text/qtextmarkdownwriter/data/blockquotes.md

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+In 1958, Mahatma Gandhi was quoted as follows:
+
+> The Earth provides enough to satisfy every man's need but not for every man's
+> greed.
+
+In [The CommonMark Specification](https://spec.commonmark.org/0.29/) John
+MacFarlane writes:
+
+> What distinguishes Markdown from many other lightweight markup syntaxes,
+> which are often easier to write, is its readability. As Gruber writes:
+
+> > The overriding design goal for Markdown's formatting syntax is to make it
+> > as readable as possible. The idea is that a Markdown-formatted document should
+> > be publishable as-is, as plain text, without looking like it's been marked up
+> > with tags or formatting instructions. ( 
+> > <http://daringfireball.net/projects/markdown/> )
+
+> The point can be illustrated by comparing a sample of AsciiDoc with an
+> equivalent sample of Markdown. Here is a sample of AsciiDoc from the AsciiDoc
+> manual:
+
+> ```AsciiDoc
+> 1. List item one.
+> +
+> List item one continued with a second paragraph followed by an
+> Indented block.
+> +
+> .................
+> $ ls *.sh
+> $ mv *.sh ~/tmp
+> .................
+> +
+> List item continued with a third paragraph.
+> 
+> 2. List item two continued with an open block.
+> ...
+> ```
+The quotation includes an embedded quotation and a code quotation and ends with
+an ellipsis due to being incomplete.
+
+Now let's have an indented code block:
+
+    #include <stdio.h>
+    
+    int main(void)
+    {
+        printf("# hello markdown\n");
+        return 0;
+    }
+
+and end with a fenced code block:
+
+~~~pseudocode
+#include <something.h>
+#include <else.h>
+
+a block {
+    a statement;
+    another statement;
+}
+~~~
+

tests/auto/gui/text/qtextmarkdownwriter/data/example.md

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+# QTextEdit
+
+The QTextEdit widget is an advanced editor that supports formatted rich text.
+It can be used to display HTML and other rich document formats. Internally,
+QTextEdit uses the QTextDocument class to describe both the high-level
+structure of each document and the low-level formatting of paragraphs.
+
+If you are viewing this document in the textedit example, you can edit this
+document to explore Qt's rich text editing features. We have included some
+comments in each of the following sections to encourage you to experiment.
+
+## Font and Paragraph Styles
+
+QTextEdit supports **bold**, *italic*, _underline_ and ~~strikethrough~~ font
+styles, and can display multicolored text. Font families such as Times New
+Roman and `Courier` can also be used directly. *If you place the cursor in a
+region of styled text, the controls in the tool bars will change to reflect the
+current style.*
+
+Paragraphs can be formatted so that the text is left-aligned, right-aligned,
+centered, or fully justified.
+
+*Try changing the alignment of some text and resize the editor to see how the
+text layout changes.*
+
+## Lists
+
+Different kinds of lists can be included in rich text documents. Standard
+bullet lists can be nested, using different symbols for each level of the list:
+
+- Disc symbols are typically used for top-level list items.
+  * Circle symbols can be used to distinguish between items in lower-level
+    lists.
+    + Square symbols provide a reasonable alternative to discs and circles.
+
+Ordered lists can be created that can be used for tables of contents. Different
+characters can be used to enumerate items, and we can use both Roman and Arabic
+numerals in the same list structure:
+
+1.  Introduction
+2.  Qt Tools
+    1)  Qt Assistant
+    2)  Qt Designer
+        1.  Form Editor
+        2.  Component Architecture
+    3)  Qt Linguist
+
+The list will automatically be renumbered if you add or remove items. *Try
+adding new sections to the above list or removing existing item to see the
+numbers change.*
+
+## Images
+
+Inline images are treated like ordinary ranges of characters in the text
+editor, so they flow with the surrounding text. Images can also be selected in
+the same way as text, making it easy to cut, copy, and paste them.
+
+![image](images/logo32.png) *Try to select this image by clicking and dragging
+over it with the mouse, or use the text cursor to select it by holding down
+Shift and using the arrow keys. You can then cut or copy it, and paste it into
+different parts of this document.*
+
+## Tables
+
+QTextEdit can arrange and format tables, supporting features such as row and
+column spans, text formatting within cells, and size constraints for columns.
+
+
+|             |Development Tools                   |Programming Techniques     |Graphical User Interfaces|
+|-------------|------------------------------------|---------------------------|-------------------------|
+|9:00 - 11:00 |Introduction to Qt                                                                      |||
+|11:00 - 13:00|Using qmake                         |Object-oriented Programming|Layouts in Qt            |
+|13:00 - 15:00|Qt Designer Tutorial                |Extreme Programming        |Writing Custom Styles    |
+|15:00 - 17:00|Qt Linguist and Internationalization|Test-Driven Development    |                         |
+
+*Try adding text to the cells in the table and experiment with the alignment of
+the paragraphs.*
+
+## Hyperlinks
+
+QTextEdit is designed to support hyperlinks between documents, and this feature
+is used extensively in 
+[Qt Assistant](http://doc.qt.io/qt-5/qtassistant-index.html). Hyperlinks are
+automatically created when an HTML file is imported into an editor. Since the
+rich text framework supports hyperlinks natively, they can also be created
+programmatically.
+
+## Undo and Redo
+
+Full support for undo and redo operations is built into QTextEdit and the
+underlying rich text framework. Operations on a document can be packaged
+together to make editing a more comfortable experience for the user.
+
+*Try making changes to this document and press `Ctrl+Z` to undo them. You can
+always recover the original contents of the document.*
+

tests/auto/gui/text/qtextmarkdownwriter/data/headingsAndLists.md

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+# heading 1
+
+- list item 1
+- list item 2
+
+## heading 2
+
+1)  list item 1
+2)  list item 2
+
+the end paragraph
+

tests/auto/gui/text/qtextmarkdownwriter/data/links.md

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+A series of links.
+
+[link](/uri)
+
+[link]()
+
+[link](/uri "title")
+
+[link](/uri "àbcdè")
+
+[link](/uri "title title \" title title")
+
+[link](/url "title \""")
+
+[link](/url "title
+title
+title title
+\"title\" title \"
+title")
+
+* [link](/url "title")
+* [link](/url)
+* [link](/url "title
+title title")
+* nonlink
+
+Qt has the <https://qt.io> site
+

tests/auto/gui/text/qtextmarkdownwriter/data/listsAndCodeBlocks.md

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+- something happens in the debugger like this:
+
+  ```
+  1   QQuickEventPoint::setGrabberItem                 qquickevents.cpp     869 0x7ffff7a963f2 
+  2   QQuickItem::grabMouse                            qquickitem.cpp      7599 0x7ffff7abea29 
+  3   QQuickWindowPrivate::deliverMatchingPointsToItem qquickwindow.cpp    2738 0x7ffff7aea34c 
+  4   QQuickWindowPrivate::deliverPressOrReleaseEvent  qquickwindow.cpp    2692 0x7ffff7ae9e57 
+  5   QQuickWindowPrivate::deliverMouseEvent           qquickwindow.cpp    1911 0x7ffff7ae561b 
+  6   QQuickWindowPrivate::deliverPointerEvent         qquickwindow.cpp    2454 0x7ffff7ae888c 
+  7   QQuickWindowPrivate::handleMouseEvent            qquickwindow.cpp    2282 0x7ffff7ae7f1a 
+  8   QQuickWindow::mousePressEvent                    qquickwindow.cpp    2249 0x7ffff7ae7bf5 
+  9   QQuickView::mousePressEvent                      qquickview.cpp       626 0x7ffff7bd6bad 
+  10  QWindow::event                                   qwindow.cpp         2258 0x7ffff70b2c54 
+  ```
+  and then I want to explain something about it.
+
+- something I tried to fix it:
+
+  ```c++
+  item->ungrab();
+  ```
+- still didn't fix it, expecting a breakthrough any day now
+- some sort of miracle
+- profit!
+- Alternatively we can have a non-indented fenced code block under a list item:
+
+```qml
+import QtQuick
+Text { text: "hello world" }
+```
+- but that means the code block is not part of the list item.

tests/auto/gui/text/qtextmarkdownwriter/data/wordWrap.md

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+[The CommonMark Specification](https://spec.commonmark.org/0.29/) is the
+conservative formal specification of the Markdown format, while 
+[GitHub Flavored Markdown](https://guides.github.com/features/mastering-markdown/#GitHub-flavored-markdown)
+adds extra features such as task lists and tables.
+
+Qt owes thanks to the authors of the [MD4C parser](https://github.com/mity/md4c)
+for making markdown import possible. The QTextMarkdownWriter class does not
+have such dependencies, and also has not yet been tested as extensively, so we
+do not yet guarantee that we are able to rewrite every Markdown document that
+you are able to read and display with Text or QTextEdit. But you are free to
+write [bugs](https://bugreports.qt.io) about any troublesome cases that you
+encounter.
+

tests/auto/gui/text/qtextmarkdownwriter/tst_qtextmarkdownwriter.cpp

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+// Copyright (C) 2019 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include <QTest>
+#include <QTextDocument>
+#include <QTextCursor>
+#include <QTextBlock>
+#include <QTextList>
+#include <QTextTable>
+#include <QBuffer>
+#include <QDebug>
+#include <QFontInfo>
+#include <QLoggingCategory>
+
+#include <private/qtextmarkdownwriter_p.h>
+
+Q_LOGGING_CATEGORY(lcTests, "qt.text.tests")
+
+// #define DEBUG_WRITE_OUTPUT
+
+class tst_QTextMarkdownWriter : public QObject
+{
+    Q_OBJECT
+public slots:
+    void init();
+    void cleanup();
+
+private slots:
+    void testWriteParagraph_data();
+    void testWriteParagraph();
+    void testWriteList();
+    void testWriteEmptyList();
+    void testWriteCheckboxListItemEndingWithCode();
+    void testWriteNestedBulletLists_data();
+    void testWriteNestedBulletLists();
+    void testWriteNestedNumericLists();
+    void testWriteTable();
+    void rewriteDocument_data();
+    void rewriteDocument();
+    void fromHtml_data();
+    void fromHtml();
+
+private:
+    bool isMainFontFixed();
+    bool isFixedFontProportional();
+    QString documentToUnixMarkdown();
+
+private:
+    QTextDocument *document;
+};
+
+void tst_QTextMarkdownWriter::init()
+{
+    document = new QTextDocument();
+}
+
+void tst_QTextMarkdownWriter::cleanup()
+{
+    delete document;
+}
+
+bool tst_QTextMarkdownWriter::isMainFontFixed()
+{
+    bool ret = QFontInfo(QGuiApplication::font()).fixedPitch();
+    if (ret) {
+        qCWarning(lcTests) << "QFontDatabase::GeneralFont is monospaced: markdown writing is likely to use too many backticks"
+                           << QFontDatabase::systemFont(QFontDatabase::GeneralFont);
+    }
+    return ret;
+}
+
+bool tst_QTextMarkdownWriter::isFixedFontProportional()
+{
+    bool ret = !QFontInfo(QFontDatabase::systemFont(QFontDatabase::FixedFont)).fixedPitch();
+    if (ret) {
+        qCWarning(lcTests) << "QFontDatabase::FixedFont is NOT monospaced: markdown writing is likely to use too few backticks"
+                           << QFontDatabase::systemFont(QFontDatabase::FixedFont);
+    }
+    return ret;
+}
+
+QString tst_QTextMarkdownWriter::documentToUnixMarkdown()
+{
+    QString ret;
+    QTextStream ts(&ret, QIODevice::WriteOnly);
+    QTextMarkdownWriter writer(ts, QTextDocument::MarkdownDialectGitHub);
+    writer.writeAll(document);
+    return ret;
+}
+
+void tst_QTextMarkdownWriter::testWriteParagraph_data()
+{
+    QTest::addColumn<QString>("input");
+    QTest::addColumn<QString>("expectedOutput");
+
+    QTest::newRow("empty") << "" <<
+        "";
+    QTest::newRow("spaces") << "foobar   word" <<
+        "foobar   word\n\n";
+    QTest::newRow("starting spaces") << "  starting spaces" <<
+        "  starting spaces\n\n";
+    QTest::newRow("trailing spaces") << "trailing spaces  " <<
+        "trailing spaces  \n\n";
+    QTest::newRow("tab") << "word\ttab x" <<
+        "word\ttab x\n\n";
+    QTest::newRow("tab2") << "word\t\ttab\tx" <<
+        "word\t\ttab\tx\n\n";
+    QTest::newRow("misc") << "foobar   word\ttab x" <<
+        "foobar   word\ttab x\n\n";
+    QTest::newRow("misc2") << "\t     \tFoo" <<
+        "\t     \tFoo\n\n";
+}
+
+void tst_QTextMarkdownWriter::testWriteParagraph()
+{
+    QFETCH(QString, input);
+    QFETCH(QString, expectedOutput);
+
+    QTextCursor cursor(document);
+    cursor.insertText(input);
+
+    const QString output = documentToUnixMarkdown();
+    if (output != expectedOutput && isMainFontFixed())
+        QEXPECT_FAIL("", "fixed-pitch main font (QTBUG-103484)", Continue);
+    QCOMPARE(output, expectedOutput);
+}
+
+void tst_QTextMarkdownWriter::testWriteList()
+{
+    QTextCursor cursor(document);
+    QTextList *list = cursor.createList(QTextListFormat::ListDisc);
+    cursor.insertText("ListItem 1");
+    list->add(cursor.block());
+    cursor.insertBlock();
+    cursor.insertText("ListItem 2");
+    list->add(cursor.block());
+
+    const QString output = documentToUnixMarkdown();
+    const QString expected = QString::fromLatin1("- ListItem 1\n- ListItem 2\n");
+    if (output != expected && isMainFontFixed())
+        QEXPECT_FAIL("", "fixed-pitch main font (QTBUG-103484)", Continue);
+    QCOMPARE(output, expected);
+}
+
+void tst_QTextMarkdownWriter::testWriteEmptyList()
+{
+    QTextCursor cursor(document);
+    cursor.createList(QTextListFormat::ListDisc);
+
+    QCOMPARE(documentToUnixMarkdown(), QString::fromLatin1("- \n"));
+}
+
+void tst_QTextMarkdownWriter::testWriteCheckboxListItemEndingWithCode()
+{
+    QTextCursor cursor(document);
+    QTextList *list = cursor.createList(QTextListFormat::ListDisc);
+    cursor.insertText("Image.originalSize property (not necessary; PdfDocument.pagePointSize() substitutes)");
+    list->add(cursor.block());
+    {
+        auto fmt = cursor.block().blockFormat();
+        fmt.setMarker(QTextBlockFormat::MarkerType::Unchecked);
+        cursor.setBlockFormat(fmt);
+    }
+    cursor.movePosition(QTextCursor::PreviousWord, QTextCursor::MoveAnchor, 2);
+    cursor.movePosition(QTextCursor::Left, QTextCursor::MoveAnchor);
+    cursor.movePosition(QTextCursor::PreviousWord, QTextCursor::KeepAnchor, 4);
+    QCOMPARE(cursor.selectedText(), QString::fromLatin1("PdfDocument.pagePointSize()"));
+    auto fmt = cursor.charFormat();
+    fmt.setFontFixedPitch(true);
+    cursor.setCharFormat(fmt);
+    cursor.movePosition(QTextCursor::PreviousWord, QTextCursor::MoveAnchor, 5);
+    cursor.movePosition(QTextCursor::Left, QTextCursor::MoveAnchor);
+    cursor.movePosition(QTextCursor::PreviousWord, QTextCursor::KeepAnchor, 4);
+    QCOMPARE(cursor.selectedText(), QString::fromLatin1("Image.originalSize"));
+    cursor.setCharFormat(fmt);
+
+    const QString output = documentToUnixMarkdown();
+    const QString expected = QString::fromLatin1(
+                "- [ ] `Image.originalSize` property (not necessary; `PdfDocument.pagePointSize()`\n  substitutes)\n");
+    if (output != expected && isMainFontFixed())
+        QEXPECT_FAIL("", "fixed-pitch main font (QTBUG-103484)", Continue);
+    QCOMPARE(output, expected);
+}
+
+void tst_QTextMarkdownWriter::testWriteNestedBulletLists_data()
+{
+    QTest::addColumn<bool>("checkbox");
+    QTest::addColumn<bool>("checked");
+    QTest::addColumn<bool>("continuationLine");
+    QTest::addColumn<bool>("continuationParagraph");
+    QTest::addColumn<QString>("expectedOutput");
+
+    QTest::newRow("plain bullets") << false << false << false << false <<
+        "- ListItem 1\n  * ListItem 2\n    + ListItem 3\n- ListItem 4\n  * ListItem 5\n";
+    QTest::newRow("bullets with continuation lines") << false << false << true << false <<
+        "- ListItem 1\n  * ListItem 2\n    + ListItem 3 with text that won't fit on one line and thus needs a\n      continuation\n- ListItem 4\n  * ListItem 5 with text that won't fit on one line and thus needs a\n    continuation\n";
+    QTest::newRow("bullets with continuation paragraphs") << false << false << false << true <<
+        "- ListItem 1\n\n  * ListItem 2\n    + ListItem 3\n\n      continuation\n\n- ListItem 4\n\n  * ListItem 5\n\n    continuation\n\n";
+    QTest::newRow("unchecked") << true << false << false << false <<
+        "- [ ] ListItem 1\n  * [ ] ListItem 2\n    + [ ] ListItem 3\n- [ ] ListItem 4\n  * [ ] ListItem 5\n";
+    QTest::newRow("checked") << true << true << false << false <<
+        "- [x] ListItem 1\n  * [x] ListItem 2\n    + [x] ListItem 3\n- [x] ListItem 4\n  * [x] ListItem 5\n";
+    QTest::newRow("checked with continuation lines") << true << true << true << false <<
+        "- [x] ListItem 1\n  * [x] ListItem 2\n    + [x] ListItem 3 with text that won't fit on one line and thus needs a\n      continuation\n- [x] ListItem 4\n  * [x] ListItem 5 with text that won't fit on one line and thus needs a\n    continuation\n";
+    QTest::newRow("checked with continuation paragraphs") << true << true << false << true <<
+        "- [x] ListItem 1\n\n  * [x] ListItem 2\n    + [x] ListItem 3\n\n      continuation\n\n- [x] ListItem 4\n\n  * [x] ListItem 5\n\n    continuation\n\n";
+}
+
+void tst_QTextMarkdownWriter::testWriteNestedBulletLists()
+{
+    QFETCH(bool, checkbox);
+    QFETCH(bool, checked);
+    QFETCH(bool, continuationParagraph);
+    QFETCH(bool, continuationLine);
+    QFETCH(QString, expectedOutput);
+
+    QTextCursor cursor(document);
+    QTextBlockFormat blockFmt = cursor.blockFormat();
+    if (checkbox) {
+        blockFmt.setMarker(checked ? QTextBlockFormat::MarkerType::Checked : QTextBlockFormat::MarkerType::Unchecked);
+        cursor.setBlockFormat(blockFmt);
+    }
+
+    QTextList *list1 = cursor.createList(QTextListFormat::ListDisc);
+    cursor.insertText("ListItem 1");
+    list1->add(cursor.block());
+
+    QTextListFormat fmt2;
+    fmt2.setStyle(QTextListFormat::ListCircle);
+    fmt2.setIndent(2);
+    QTextList *list2 = cursor.insertList(fmt2);
+    cursor.insertText("ListItem 2");
+
+    QTextListFormat fmt3;
+    fmt3.setStyle(QTextListFormat::ListSquare);
+    fmt3.setIndent(3);
+    cursor.insertList(fmt3);
+    cursor.insertText(continuationLine ?
+                          "ListItem 3 with text that won't fit on one line and thus needs a continuation" :
+                          "ListItem 3");
+    if (continuationParagraph) {
+        QTextBlockFormat blockFmt;
+        blockFmt.setIndent(2);
+        cursor.insertBlock(blockFmt);
+        cursor.insertText("continuation");
+    }
+
+    cursor.insertBlock(blockFmt);
+    cursor.insertText("ListItem 4");
+    list1->add(cursor.block());
+
+    cursor.insertBlock();
+    cursor.insertText(continuationLine ?
+                          "ListItem 5 with text that won't fit on one line and thus needs a continuation" :
+                          "ListItem 5");
+    list2->add(cursor.block());
+    if (continuationParagraph) {
+        QTextBlockFormat blockFmt;
+        blockFmt.setIndent(2);
+        cursor.insertBlock(blockFmt);
+        cursor.insertText("continuation");
+    }
+
+    const QString output = documentToUnixMarkdown();
+#ifdef DEBUG_WRITE_OUTPUT
+    {
+        QFile out("/tmp/" + QLatin1String(QTest::currentDataTag()) + ".md");
+        out.open(QFile::WriteOnly);
+        out.write(output.toUtf8());
+        out.close();
+    }
+#endif
+    if (output != expectedOutput && isMainFontFixed())
+        QEXPECT_FAIL("", "fixed-pitch main font (QTBUG-103484)", Continue);
+    QCOMPARE(output, expectedOutput);
+}
+
+void tst_QTextMarkdownWriter::testWriteNestedNumericLists()
+{
+    QTextCursor cursor(document);
+
+    QTextList *list1 = cursor.createList(QTextListFormat::ListDecimal);
+    cursor.insertText("ListItem 1");
+    list1->add(cursor.block());
+
+    QTextListFormat fmt2;
+    fmt2.setStyle(QTextListFormat::ListLowerAlpha);
+    fmt2.setNumberSuffix(QLatin1String(")"));
+    fmt2.setIndent(2);
+    QTextList *list2 = cursor.insertList(fmt2);
+    cursor.insertText("ListItem 2");
+
+    QTextListFormat fmt3;
+    fmt3.setStyle(QTextListFormat::ListDecimal);
+    fmt3.setIndent(3);
+    cursor.insertList(fmt3);
+    cursor.insertText("ListItem 3");
+
+    cursor.insertBlock();
+    cursor.insertText("ListItem 4");
+    list1->add(cursor.block());
+
+    cursor.insertBlock();
+    cursor.insertText("ListItem 5");
+    list2->add(cursor.block());
+
+    const QString output = documentToUnixMarkdown();
+    // There's no QTextList API to set the starting number so we hard-coded all lists to start at 1 (QTBUG-65384)
+    const QString expected = QString::fromLatin1(
+                "1.  ListItem 1\n    1)  ListItem 2\n        1.  ListItem 3\n2.  ListItem 4\n    2)  ListItem 5\n");
+    if (output != expected && isMainFontFixed())
+        QEXPECT_FAIL("", "fixed-pitch main font (QTBUG-103484)", Continue);
+    QCOMPARE(output, expected);
+}
+
+void tst_QTextMarkdownWriter::testWriteTable()
+{
+    QTextCursor cursor(document);
+    QTextTable * table = cursor.insertTable(4, 3);
+    cursor = table->cellAt(0, 0).firstCursorPosition();
+    // valid Markdown tables need headers, but QTextTable doesn't make that distinction
+    // so QTextMarkdownWriter assumes the first row of any table is a header
+    cursor.insertText("one");
+    cursor.movePosition(QTextCursor::NextCell);
+    cursor.insertText("two");
+    cursor.movePosition(QTextCursor::NextCell);
+    cursor.insertText("three");
+    cursor.movePosition(QTextCursor::NextCell);
+
+    cursor.insertText("alice");
+    cursor.movePosition(QTextCursor::NextCell);
+    cursor.insertText("bob");
+    cursor.movePosition(QTextCursor::NextCell);
+    cursor.insertText("carl");
+    cursor.movePosition(QTextCursor::NextCell);
+
+    cursor.insertText("dennis");
+    cursor.movePosition(QTextCursor::NextCell);
+    cursor.insertText("eric");
+    cursor.movePosition(QTextCursor::NextCell);
+    cursor.insertText("fiona");
+    cursor.movePosition(QTextCursor::NextCell);
+
+    cursor.insertText("gina");
+    /*
+        |one   |two |three|
+        |------|----|-----|
+        |alice |bob |carl |
+        |dennis|eric|fiona|
+        |gina  |    |     |
+    */
+
+    QString md = documentToUnixMarkdown();
+
+#ifdef DEBUG_WRITE_OUTPUT
+    {
+        QFile out("/tmp/table.md");
+        out.open(QFile::WriteOnly);
+        out.write(md.toUtf8());
+        out.close();
+    }
+#endif
+
+    QString expected = QString::fromLatin1(
+        "\n|one   |two |three|\n|------|----|-----|\n|alice |bob |carl |\n|dennis|eric|fiona|\n|gina  |    |     |\n\n");
+    if (md != expected && isMainFontFixed())
+        QEXPECT_FAIL("", "fixed-pitch main font (QTBUG-103484)", Continue);
+    QCOMPARE(md, expected);
+
+    // create table with merged cells
+    document->clear();
+    cursor = QTextCursor(document);
+    table = cursor.insertTable(3, 3);
+    table->mergeCells(0, 0, 1, 2);
+    table->mergeCells(1, 1, 1, 2);
+    cursor = table->cellAt(0, 0).firstCursorPosition();
+    cursor.insertText("a");
+    cursor.movePosition(QTextCursor::NextCell);
+    cursor.insertText("b");
+    cursor.movePosition(QTextCursor::NextCell);
+    cursor.insertText("c");
+    cursor.movePosition(QTextCursor::NextCell);
+    cursor.insertText("d");
+    cursor.movePosition(QTextCursor::NextCell);
+    cursor.insertText("e");
+    cursor.movePosition(QTextCursor::NextCell);
+    cursor.insertText("f");
+    /*
+      +---+-+
+      |a  |b|
+      +---+-+
+      |c|  d|
+      +-+-+-+
+      |e|f| |
+      +-+-+-+
+
+      generates
+
+      |a ||b|
+      |-|-|-|
+      |c|d ||
+      |e|f| |
+
+    */
+
+    md = documentToUnixMarkdown();
+
+#ifdef DEBUG_WRITE_OUTPUT
+    {
+        QFile out("/tmp/table-merged-cells.md");
+        out.open(QFile::WriteOnly);
+        out.write(md.toUtf8());
+        out.close();
+    }
+#endif
+
+    expected = QString::fromLatin1("\n|a ||b|\n|-|-|-|\n|c|d ||\n|e|f| |\n\n");
+    if (md != expected && isMainFontFixed())
+        QEXPECT_FAIL("", "fixed-pitch main font (QTBUG-103484)", Continue);
+    QCOMPARE(md, expected);
+}
+
+void tst_QTextMarkdownWriter::rewriteDocument_data()
+{
+    QTest::addColumn<QString>("inputFile");
+
+    QTest::newRow("block quotes") << "blockquotes.md";
+    QTest::newRow("example") << "example.md";
+    QTest::newRow("list items after headings") << "headingsAndLists.md";
+    QTest::newRow("word wrap") << "wordWrap.md";
+    QTest::newRow("links") << "links.md";
+    QTest::newRow("lists and code blocks") << "listsAndCodeBlocks.md";
+}
+
+void tst_QTextMarkdownWriter::rewriteDocument()
+{
+    QFETCH(QString, inputFile);
+    QTextDocument doc;
+    QFile f(QFINDTESTDATA("data/" + inputFile));
+    QVERIFY(f.open(QFile::ReadOnly | QIODevice::Text));
+    QString orig = QString::fromUtf8(f.readAll());
+    f.close();
+    doc.setMarkdown(orig);
+    QString md = doc.toMarkdown();
+
+#ifdef DEBUG_WRITE_OUTPUT
+    QFile out("/tmp/rewrite-" + inputFile);
+    out.open(QFile::WriteOnly);
+    out.write(md.toUtf8());
+    out.close();
+#endif
+
+    if (md != orig && isMainFontFixed())
+        QEXPECT_FAIL("", "fixed-pitch main font (QTBUG-103484)", Continue);
+    QCOMPARE(md, orig);
+}
+
+void tst_QTextMarkdownWriter::fromHtml_data()
+{
+    QTest::addColumn<QString>("input");
+    QTest::addColumn<QString>("expectedOutput");
+
+    QTest::newRow("long URL") <<
+        "<span style=\"font-style:italic;\">https://www.example.com/dir/subdir/subsubdir/subsubsubdir/subsubsubsubdir/subsubsubsubsubdir/</span>" <<
+        "*https://www.example.com/dir/subdir/subsubdir/subsubsubdir/subsubsubsubdir/subsubsubsubsubdir/*\n\n";
+    QTest::newRow("non-emphasis inline asterisk") << "3 * 4" << "3 * 4\n\n";
+    QTest::newRow("arithmetic") << "(2 * a * x + b)^2 = b^2 - 4 * a * c" << "(2 * a * x + b)^2 = b^2 - 4 * a * c\n\n";
+    QTest::newRow("escaped asterisk after newline") <<
+        "The first sentence of this paragraph holds 80 characters, then there's a star. * This is wrapped, but is <em>not</em> a bullet point." <<
+        "The first sentence of this paragraph holds 80 characters, then there's a star.\n\\* This is wrapped, but is *not* a bullet point.\n\n";
+    QTest::newRow("escaped plus after newline") <<
+        "The first sentence of this paragraph holds 80 characters, then there's a plus. + This is wrapped, but is <em>not</em> a bullet point." <<
+        "The first sentence of this paragraph holds 80 characters, then there's a plus.\n\\+ This is wrapped, but is *not* a bullet point.\n\n";
+    QTest::newRow("escaped hyphen after newline") <<
+        "The first sentence of this paragraph holds 80 characters, then there's a minus. - This is wrapped, but is <em>not</em> a bullet point." <<
+        "The first sentence of this paragraph holds 80 characters, then there's a minus.\n\\- This is wrapped, but is *not* a bullet point.\n\n";
+    QTest::newRow("list items with indented continuations") <<
+        "<ul><li>bullet<p>continuation paragraph</p></li><li>another bullet<br/>continuation line</li></ul>" <<
+        "- bullet\n\n  continuation paragraph\n\n- another bullet\n  continuation line\n";
+    QTest::newRow("nested list items with continuations") <<
+        "<ul><li>bullet<p>continuation paragraph</p></li><li>another bullet<br/>continuation line</li><ul><li>bullet<p>continuation paragraph</p></li><li>another bullet<br/>continuation line</li></ul></ul>" <<
+        "- bullet\n\n  continuation paragraph\n\n- another bullet\n  continuation line\n\n  - bullet\n\n    continuation paragraph\n\n  - another bullet\n    continuation line\n";
+    QTest::newRow("nested ordered list items with continuations") <<
+        "<ol><li>item<p>continuation paragraph</p></li><li>another item<br/>continuation line</li><ol><li>item<p>continuation paragraph</p></li><li>another item<br/>continuation line</li></ol><li>another</li><li>another</li></ol>" <<
+        "1.  item\n\n    continuation paragraph\n\n2.  another item\n    continuation line\n\n    1.  item\n\n        continuation paragraph\n\n    2.  another item\n        continuation line\n\n3.  another\n4.  another\n";
+    QTest::newRow("thematic break") <<
+        "something<hr/>something else" <<
+        "something\n\n- - -\nsomething else\n\n";
+    QTest::newRow("block quote") <<
+        "<p>In 1958, Mahatma Gandhi was quoted as follows:</p><blockquote>The Earth provides enough to satisfy every man's need but not for every man's greed.</blockquote>" <<
+        "In 1958, Mahatma Gandhi was quoted as follows:\n\n> The Earth provides enough to satisfy every man's need but not for every man's\n> greed.\n\n";
+    QTest::newRow("image") <<
+        "<img src=\"/url\" alt=\"foo\" title=\"title\"/>" <<
+        "![foo](/url \"title\")\n\n";
+    QTest::newRow("code") <<
+        "<pre class=\"language-pseudocode\">\n#include \"foo.h\"\n\nblock {\n    statement();\n}\n\n</pre>" <<
+        "```pseudocode\n#include \"foo.h\"\n\nblock {\n    statement();\n}\n\n```\n\n";
+    // TODO
+//    QTest::newRow("escaped number and paren after double newline") <<
+//        "<p>(The first sentence of this paragraph is a line, the next paragraph has a number</p>13) but that's not part of an ordered list" <<
+//        "(The first sentence of this paragraph is a line, the next paragraph has a number\n\n13\\) but that's not part of an ordered list\n\n";
+    QTest::newRow("preformats with embedded backticks") <<
+        "<pre>none `one` ``two``</pre>plain<pre>```three``` ````four````</pre>plain" <<
+        "```\nnone `one` ``two``\n\n```\nplain\n\n```\n```three``` ````four````\n\n```\nplain\n\n";
+    QTest::newRow("list items with and without checkboxes") <<
+        "<ul><li>bullet</li><li class=\"unchecked\">unchecked item</li><li class=\"checked\">checked item</li></ul>" <<
+        "- bullet\n- [ ] unchecked item\n- [x] checked item\n";
+}
+
+void tst_QTextMarkdownWriter::fromHtml()
+{
+    QFETCH(QString, input);
+    QFETCH(QString, expectedOutput);
+
+    document->setHtml(input);
+    QString output = documentToUnixMarkdown();
+
+#ifdef DEBUG_WRITE_OUTPUT
+    {
+        QFile out("/tmp/" + QLatin1String(QTest::currentDataTag()) + ".md");
+        out.open(QFile::WriteOnly);
+        out.write(output.toUtf8());
+        out.close();
+    }
+#endif
+
+    if (output != expectedOutput && (isMainFontFixed() || isFixedFontProportional()))
+        QEXPECT_FAIL("", "fixed main font or proportional fixed font (QTBUG-103484)", Continue);
+    QCOMPARE(output, expectedOutput);
+}
+
+QTEST_MAIN(tst_QTextMarkdownWriter)
+#include "tst_qtextmarkdownwriter.moc"