1 files changed, 59 insertions, 0 deletions
diff --git a/src/qml/qml/qqmlsourcecoordinate_p.h b/src/qml/qml/qqmlsourcecoordinate_p.h
new file mode 100644
index 0000000000..f7474f4d9b
--- /dev/null
+++ b/src/qml/qml/qqmlsourcecoordinate_p.h
@@ -0,0 +1,59 @@
+// Copyright (C) 2018 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QQMLSOURCECOORDINATE_P_H
+#define QQMLSOURCECOORDINATE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/private/qglobal_p.h>
+
+#include <limits>
+
+QT_BEGIN_NAMESPACE
+
+// These methods are needed because in some public methods we historically interpret -1 as the
+// invalid line or column, even though all the lines and columns are 1-based. Also, the different
+// integer ranges may turn certain large values into invalid ones on conversion.
+
+template<typename From, typename To>
+To qmlConvertSourceCoordinate(From n);
+
+template<>
+inline quint16 qmlConvertSourceCoordinate<int, quint16>(int n)
+{
+    return (n > 0 && n <= int(std::numeric_limits<quint16>::max())) ? quint16(n) : 0;
+}
+
+template<>
+inline quint32 qmlConvertSourceCoordinate<int, quint32>(int n)
+{
+    return n > 0 ? quint32(n) : 0u;
+}
+
+// TODO: In Qt6, change behavior and make the invalid coordinate 0 for the following two methods.
+
+template<>
+inline int qmlConvertSourceCoordinate<quint16, int>(quint16 n)
+{
+    return (n == 0u) ? -1 : int(n);
+}
+
+template<>
+inline int qmlConvertSourceCoordinate<quint32, int>(quint32 n)
+{
+    return (n == 0u || n > quint32(std::numeric_limits<int>::max())) ? -1 : int(n);
+}
+
+QT_END_NAMESPACE
+
+#endif // QQMLSOURCECOORDINATE_P_H