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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#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
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