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| |
| #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 |