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+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QV4STRINGTOARRAYINDEX_P_H
+#define QV4STRINGTOARRAYINDEX_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/qnumeric_p.h>
+#include <QtCore/qstring.h>
+#include <limits>
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+
+inline uint charToUInt(const QChar *ch) { return ch->unicode(); }
+inline uint charToUInt(const char *ch) { return static_cast<unsigned char>(*ch); }
+
+template <typename T>
+uint stringToArrayIndex(const T *ch, const T *end)
+{
+    uint i = charToUInt(ch) - '0';
+    if (i > 9)
+        return std::numeric_limits<uint>::max();
+    ++ch;
+    // reject "01", "001", ...
+    if (i == 0 && ch != end)
+        return std::numeric_limits<uint>::max();
+
+    while (ch < end) {
+        uint x = charToUInt(ch) - '0';
+        if (x > 9)
+            return std::numeric_limits<uint>::max();
+        if (mul_overflow(i, uint(10), &i) || add_overflow(i, x, &i)) // i = i * 10 + x
+            return std::numeric_limits<uint>::max();
+        ++ch;
+    }
+    return i;
+}
+
+inline uint stringToArrayIndex(const QString &str)
+{
+    return stringToArrayIndex(str.constData(), str.constData() + str.length());
+}
+
+} // namespace QV4
+
+QT_END_NAMESPACE
+
+#endif // QV4STRINGTOARRAYINDEX_P_H