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// Copyright (C) 2019 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 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)
{
if (ch == end)
return std::numeric_limits<uint>::max();
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 (qMulOverflow(i, uint(10), &i) || qAddOverflow(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.size());
}
} // namespace QV4
QT_END_NAMESPACE
#endif // QV4STRINGTOARRAYINDEX_P_H
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