Utils: add Position::fromCursor with tests

Change-Id: I1cd989eaf7e75bc04f171989f9f9fe932402abef
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

src/libs/utils/textutils.cpp

@@ -59,6 +59,11 @@ Position Position::fromPositionInDocument(const QTextDocument *document, int pos
     return {};
 }
 
+Position Position::fromCursor(const QTextCursor &c)
+{
+    return c.isNull() ? Position{} : Position{c.blockNumber() + 1, c.positionInBlock()};
+}
+
 int Range::length(const QString &text) const
 {
     if (end.line < begin.line)

src/libs/utils/textutils.h

@@ -32,6 +32,7 @@ public:
 
     static Position fromFileName(QStringView fileName, int &postfixPos);
     static Position fromPositionInDocument(const QTextDocument *document, int pos);
+    static Position fromCursor(const QTextCursor &cursor);
 };
 
 class QTCREATOR_UTILS_EXPORT Range

tests/auto/utils/text/tst_text.cpp

@@ -3,6 +3,7 @@
 
 #include <utils/textutils.h>
 
+#include <QTextCursor>
 #include <QTextDocument>
 #include <QtTest>
 
@@ -19,6 +20,9 @@ private slots:
     void testPositionFromPositionInDocument_data();
     void testPositionFromPositionInDocument();
 
+    void testPositionFromCursor_data();
+    void testPositionFromCursor();
+
     void testRangeLength_data();
     void testRangeLength();
 };
@@ -135,6 +139,36 @@ void tst_Text::testPositionFromPositionInDocument()
     QCOMPARE(Position::fromPositionInDocument(&doc, documentPosition), position);
 }
 
+void tst_Text::testPositionFromCursor_data()
+{
+    QTest::addColumn<QString>("text");
+    QTest::addColumn<int>("documentPosition");
+    QTest::addColumn<Position>("position");
+
+    QTest::newRow("0") << QString() << 0 << Position{1, 0};
+    QTest::newRow("-1") << QString() << -1 << Position{};
+    QTest::newRow("mid line") << QString("foo\n") << 1 << Position{1, 1};
+    QTest::newRow("second line") << QString("foo\n") << 4 << Position{2, 0};
+    QTest::newRow("second mid line") << QString("foo\nbar") << 5 << Position{2, 1};
+    QTest::newRow("behind content") << QString("foo\nbar") << 8 << Position{1, 0};
+}
+
+void tst_Text::testPositionFromCursor()
+{
+    QFETCH(QString, text);
+    QFETCH(int, documentPosition);
+    QFETCH(Position, position);
+
+    if (documentPosition < 0) {// test invalid Cursor {
+        QCOMPARE(Position::fromCursor(QTextCursor()), position);
+    } else {
+        QTextDocument doc(text);
+        QTextCursor cursor(&doc);
+        cursor.setPosition(documentPosition);
+        QCOMPARE(Position::fromCursor(cursor), position);
+    }
+}
+
 void tst_Text::testRangeLength_data()
 {
     QTest::addColumn<QString>("text");