qtextstream.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

*/
QTextStream &QTextStream::operator>>(QByteArray &array)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);

    array.clear();
    d->scan(0, 0, 0, QTextStreamPrivate::NotSpace);
    d->consumeLastToken();

    const QChar *ptr;
    int length;
    if (!d->scan(&ptr, &length, 0, QTextStreamPrivate::Space)) {
        setStatus(ReadPastEnd);
        return *this;
    }

    for (int i = 0; i < length; ++i)
        array += ptr[i].toLatin1();

    d->consumeLastToken();
    return *this;
}

/*!
    \overload

    Stores the word in \a c, terminated by a '\0' character. If no word is
    available, only the '\0' character is stored.

    Warning: Although convenient, this operator is dangerous and must
    be used with care. QTextStream assumes that \a c points to a
    buffer with enough space to hold the word. If the buffer is too
    small, your application may crash.

    If possible, use the QByteArray operator instead.
*/
QTextStream &QTextStream::operator>>(char *c)
{
    Q_D(QTextStream);
    *c = 0;
    CHECK_VALID_STREAM(*this);
    d->scan(0, 0, 0, QTextStreamPrivate::NotSpace);
    d->consumeLastToken();

    const QChar *ptr;
    int length;
    if (!d->scan(&ptr, &length, 0, QTextStreamPrivate::Space)) {
        setStatus(ReadPastEnd);
        return *this;
    }

    for (int i = 0; i < length; ++i)
        *c++ = ptr[i].toLatin1();
    *c = '\0';
    d->consumeLastToken();
    return *this;
}

/*! \internal
 */
bool QTextStreamPrivate::putNumber(qulonglong number, bool negative)
{
    QString tmp;
    if (negative)
        tmp = QLatin1Char('-');
    else if (numberFlags & QTextStream::ForceSign)
        tmp = QLatin1Char('+');

    if (numberFlags & QTextStream::ShowBase) {
        switch (integerBase) {
        case 2: tmp += QLatin1String("0b"); break;
        case 8: tmp += QLatin1String("0"); break;
        case 16: tmp += QLatin1String("0x"); break;
        default: break;
        }
    }

    tmp += QString::number(number, integerBase ? integerBase : 10);
    if (numberFlags & QTextStream::UppercaseBase)
        tmp = tmp.toUpper(); // ### in-place instead

    return putString(tmp);
}

/*!
    \internal
    \overload
*/
QTextStream &QTextStream::operator<<(QBool b)
{
    return *this << bool(b);
}

/*!
    Writes the character \a c to the stream, then returns a reference
    to the QTextStream.

    \sa setFieldWidth()
*/
QTextStream &QTextStream::operator<<(QChar c)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putString(QString(c));
    return *this;
}

/*!
    \overload

    Converts \a c from ASCII to a QChar, then writes it to the stream.
*/
QTextStream &QTextStream::operator<<(char c)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putString(QString(QChar::fromAscii(c)));
    return *this;
}

/*!
    Writes the integer number \a i to the stream, then returns a
    reference to the QTextStream. By default, the number is stored in
    decimal form, but you can also set the base by calling
    setIntegerBase().

    \sa setFieldWidth(), setNumberFlags()
*/
QTextStream &QTextStream::operator<<(signed short i)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putNumber((qulonglong)qAbs(qlonglong(i)), i < 0);
    return *this;
}

/*!
    \overload

    Writes the unsigned short \a i to the stream.
*/
QTextStream &QTextStream::operator<<(unsigned short i)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putNumber((qulonglong)i, false);
    return *this;
}

/*!
    \overload

    Writes the signed int \a i to the stream.
*/
QTextStream &QTextStream::operator<<(signed int i)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putNumber((qulonglong)qAbs(qlonglong(i)), i < 0);
    return *this;
}

/*!
    \overload

    Writes the unsigned int \a i to the stream.
*/
QTextStream &QTextStream::operator<<(unsigned int i)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putNumber((qulonglong)i, false);
    return *this;
}

/*!
    \overload

    Writes the signed long \a i to the stream.
*/
QTextStream &QTextStream::operator<<(signed long i)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putNumber((qulonglong)qAbs(qlonglong(i)), i < 0);
    return *this;
}

/*!
    \overload

    Writes the unsigned long \a i to the stream.
*/
QTextStream &QTextStream::operator<<(unsigned long i)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putNumber((qulonglong)i, false);
    return *this;
}

/*!
    \overload

    Writes the qlonglong \a i to the stream.
*/
QTextStream &QTextStream::operator<<(qlonglong i)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putNumber((qulonglong)qAbs(i), i < 0);
    return *this;
}

/*!
    \overload

    Writes the qulonglong \a i to the stream.
*/
QTextStream &QTextStream::operator<<(qulonglong i)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putNumber(i, false);
    return *this;
}

/*!
    Writes the real number \a f to the stream, then returns a
    reference to the QTextStream. By default, QTextStream stores it
    using SmartNotation, with up to 6 digits of precision. You can
    change the textual representation QTextStream will use for real
    numbers by calling setRealNumberNotation(),
    setRealNumberPrecision() and setNumberFlags().

    \sa setFieldWidth(), setRealNumberNotation(),
    setRealNumberPrecision(), setNumberFlags()
*/
QTextStream &QTextStream::operator<<(float f)
{
    return *this << double(f);
}

/*!
    \overload

    Writes the double \a f to the stream.
*/
QTextStream &QTextStream::operator<<(double f)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);

    char f_char;
    char format[16];
    if (d->realNumberNotation == FixedNotation)
        f_char = 'f';
    else if (d->realNumberNotation == ScientificNotation)
        f_char = (d->numberFlags & UppercaseBase) ? 'E' : 'e';
    else
        f_char = (d->numberFlags & UppercaseBase) ? 'G' : 'g';

    // generate format string
    register char *fs = format;

    // "%.<prec>l<f_char>"
    *fs++ = '%';
    if (d->numberFlags & QTextStream::ForcePoint)
        *fs++ = '#';
    *fs++ = '.';
    int prec = d->realNumberPrecision;
    if (prec > 99)
        prec = 99;
    if (prec >= 10) {
        *fs++ = prec / 10 + '0';
        *fs++ = prec % 10 + '0';
    } else {
        *fs++ = prec + '0';
    }
    *fs++ = 'l';
    *fs++ = f_char;
    *fs = '\0';
    QString num;
    num.sprintf(format, f);                        // convert to text

    if (f > 0.0 && (d->numberFlags & ForceSign))
        num.prepend(QLatin1Char('+'));

    d->putString(num);
    return *this;
}

/*!
    Writes the string \a string to the stream, and returns a reference
    to the QTextStream. The string is first encoded using the assigned
    codec (the default codec is QTextCodec::codecForLocale()) before
    it is written to the stream.

    \sa setFieldWidth(), setCodec()
*/
QTextStream &QTextStream::operator<<(const QString &string)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putString(string);
    return *this;
}

/*!
    \overload

    Writes \a array to the stream. The contents of \a array are
    converted with QString::fromAscii().
*/
QTextStream &QTextStream::operator<<(const QByteArray &array)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putString(QString::fromAscii(array.constData(), array.length()));
    return *this;
}

/*!
    \overload

    Writes the constant string pointed to by \a string to the stream. \a
    string is assumed to be in ISO-8859-1 encoding. This operator
    is convenient when working with constant string data. Example:

    \code
        QTextStream out(stdout);
        out << "Qt rocks!" << endl;
    \endcode

    Warning: QTextStream assumes that \a string points to a string of
    text, terminated by a '\0' character. If there is no terminating
    '\0' character, your application may crash.
*/
QTextStream &QTextStream::operator<<(const char *string)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putString(QLatin1String(string));
    return *this;
}

/*!
    \overload

    Writes \a ptr to the stream as a hexadecimal number with a base.
*/
QTextStream &QTextStream::operator<<(const void *ptr)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    int oldBase = d->integerBase;
    NumberFlags oldFlags = d->numberFlags;
    d->integerBase = 16;
    d->numberFlags |= ShowBase;
    d->putNumber(reinterpret_cast<qint64>(ptr), false);
    d->integerBase = oldBase;
    d->numberFlags = oldFlags;
    return *this;
}

/*!
    \relates QTextStream

    Calls QTextStream::setIntegerBase(2) on \a stream and returns \a
    stream.

    \sa oct(), dec(), hex(), {QTextStream manipulators}
*/
QTextStream &bin(QTextStream &stream)
{
    stream.setIntegerBase(2);
    return stream;
}

/*!
    \relates QTextStream

    Calls QTextStream::setIntegerBase(8) on \a stream and returns \a
    stream.

    \sa bin(), dec(), hex(), {QTextStream manipulators}
*/
QTextStream &oct(QTextStream &stream)
{
    stream.setIntegerBase(8);
    return stream;
}

/*!
    \relates QTextStream

    Calls QTextStream::setIntegerBase(10) on \a stream and returns \a
    stream.

    \sa bin(), oct(), hex(), {QTextStream manipulators}
*/
QTextStream &dec(QTextStream &stream)
{
    stream.setIntegerBase(10);
    return stream;
}

/*!
    \relates QTextStream

    Calls QTextStream::setIntegerBase(16) on \a stream and returns \a
    stream.

    \sa bin(), oct(), dec(), {QTextStream manipulators}
*/
QTextStream &hex(QTextStream &stream)
{
    stream.setIntegerBase(16);
    return stream;
}

/*!
    \relates QTextStream

    Calls QTextStream::setNumberFlags(QTextStream::numberFlags() |
    QTextStream::ShowBase) on \a stream and returns \a stream.

    \sa noshowbase(), forcesign(), forcepoint(), {QTextStream manipulators}
*/
QTextStream &showbase(QTextStream &stream)
{
    stream.setNumberFlags(stream.numberFlags() | QTextStream::ShowBase);
    return stream;
}

/*!
    \relates QTextStream

    Calls QTextStream::setNumberFlags(QTextStream::numberFlags() |
    QTextStream::ForceSign) on \a stream and returns \a stream.

    \sa noforcesign(), forcepoint(), showbase(), {QTextStream manipulators}
*/
QTextStream &forcesign(QTextStream &stream)
{
    stream.setNumberFlags(stream.numberFlags() | QTextStream::ForceSign);
    return stream;
}

/*!
    \relates QTextStream

    Calls QTextStream::setNumberFlags(QTextStream::numberFlags() |
    QTextStream::ForcePoint) on \a stream and returns \a stream.

    \sa noforcepoint(), forcesign(), showbase(), {QTextStream manipulators}
*/
QTextStream &forcepoint(QTextStream &stream)
{
    stream.setNumberFlags(stream.numberFlags() | QTextStream::ForcePoint);
    return stream;
}

/*!
    \relates QTextStream

    Calls QTextStream::setNumberFlags(QTextStream::numberFlags() &
    ~QTextStream::ShowBase) on \a stream and returns \a stream.

    \sa showbase(), noforcesign(), noforcepoint(), {QTextStream manipulators}
*/
QTextStream &noshowbase(QTextStream &stream)
{
    stream.setNumberFlags(stream.numberFlags() &= ~QTextStream::ShowBase);
    return stream;
}

/*!
    \relates QTextStream

    Calls QTextStream::setNumberFlags(QTextStream::numberFlags() &
    ~QTextStream::ForceSign) on \a stream and returns \a stream.

    \