qvariant.cpp

奇趣公司比较新的qt/emd版本

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** This file is part of the QtCore module of the Qt Toolkit.
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#include "qvariant.h"
#include "qbitarray.h"
#include "qbytearray.h"
#include "qdatastream.h"
#include "qdebug.h"
#include "qmap.h"
#include "qdatetime.h"
#include "qlist.h"
#include "qstring.h"
#include "qstringlist.h"
#include "qurl.h"
#include "qlocale.h"
#include "private/qvariant_p.h"

#ifndef QT_NO_GEOM_VARIANT
#include "qsize.h"
#include "qpoint.h"
#include "qrect.h"
#include "qline.h"
#endif

#include <float.h>

#ifndef DBL_DIG
#  define DBL_DIG 10
#endif
#ifndef FLT_DIG
#  define FLT_DIG 6
#endif


static const void *constData(const QVariant::Private &d)
{
    switch (d.type) {
    case QVariant::Int:
        return &d.data.i;
    case QVariant::UInt:
        return &d.data.u;
    case QVariant::Bool:
        return &d.data.b;
    case QVariant::LongLong:
        return &d.data.ll;
    case QVariant::ULongLong:
        return &d.data.ull;
    case QVariant::Double:
        return &d.data.d;
    default:
        return d.is_shared ? d.data.shared->ptr : reinterpret_cast<const void *>(&d.data.ptr);
    }
}

static void construct(QVariant::Private *x, const void *copy)
{
    x->is_shared = false;

    switch (x->type) {
    case QVariant::String:
        v_construct<QString>(x, copy);
        break;
    case QVariant::Char:
        v_construct<QChar>(x, copy);
        break;
    case QVariant::StringList:
        v_construct<QStringList>(x, copy);
        break;
    case QVariant::Map:
        v_construct<QVariantMap>(x, copy);
        break;
    case QVariant::List:
        v_construct<QVariantList>(x, copy);
        break;
    case QVariant::Date:
        v_construct<QDate>(x, copy);
        break;
    case QVariant::Time:
        v_construct<QTime>(x, copy);
        break;
    case QVariant::DateTime:
        v_construct<QDateTime>(x, copy);
        break;
    case QVariant::ByteArray:
        v_construct<QByteArray>(x, copy);
        break;
    case QVariant::BitArray:
        v_construct<QBitArray>(x, copy);
        break;
#ifndef QT_NO_GEOM_VARIANT
    case QVariant::Size:
        v_construct<QSize>(x, copy);
        break;
    case QVariant::SizeF:
        v_construct<QSizeF>(x, copy);
        break;
    case QVariant::Rect:
        v_construct<QRect>(x, copy);
        break;
    case QVariant::LineF:
        v_construct<QLineF>(x, copy);
        break;
    case QVariant::Line:
        v_construct<QLine>(x, copy);
        break;
    case QVariant::RectF:
        v_construct<QRectF>(x, copy);
        break;
    case QVariant::Point:
        v_construct<QPoint>(x, copy);
        break;
    case QVariant::PointF:
        v_construct<QPointF>(x, copy);
        break;
#endif
    case QVariant::Url:
        v_construct<QUrl>(x, copy);
        break;
    case QVariant::Locale:
        v_construct<QLocale>(x, copy);
        break;
#ifndef QT_NO_REGEXP
    case QVariant::RegExp:
        v_construct<QRegExp>(x, copy);
        break;
#endif
    case QVariant::Int:
        x->data.i = copy ? *static_cast<const int *>(copy) : 0;
        break;
    case QVariant::UInt:
        x->data.u = copy ? *static_cast<const uint *>(copy) : 0u;
        break;
    case QVariant::Bool:
        x->data.b = copy ? *static_cast<const bool *>(copy) : false;
        break;
    case QVariant::Double:
        x->data.d = copy ? *static_cast<const double*>(copy) : 0.0;
        break;
    case QVariant::LongLong:
        x->data.ll = copy ? *static_cast<const qlonglong *>(copy) : Q_INT64_C(0);
        break;
    case QVariant::ULongLong:
        x->data.ull = copy ? *static_cast<const qulonglong *>(copy) : Q_UINT64_C(0);
        break;
    case QVariant::Invalid:
    case QVariant::UserType:
        break;
    default:
        x->is_shared = true;
        x->data.shared = new QVariant::PrivateShared(QMetaType::construct(x->type, copy));
        if (!x->data.shared->ptr)
             Q_ASSERT_X(x->type > 62, "QVariant::construct()", "Unknown datatype");
        break;
    }
    x->is_null = !copy;
}

static void clear(QVariant::Private *d)
{
    switch (d->type) {
    case QVariant::String:
        v_clear<QString>(d);
        break;
    case QVariant::Char:
        v_clear<QChar>(d);
        break;
    case QVariant::StringList:
        v_clear<QStringList>(d);
        break;
    case QVariant::Map:
        v_clear<QVariantMap>(d);
        break;
    case QVariant::List:
        v_clear<QVariantList>(d);
        break;
    case QVariant::Date:
        v_clear<QDate>(d);
        break;
    case QVariant::Time:
        v_clear<QTime>(d);
        break;
    case QVariant::DateTime:
        v_clear<QDateTime>(d);
        break;
    case QVariant::ByteArray:
        v_clear<QByteArray>(d);
        break;
    case QVariant::BitArray:
        v_clear<QBitArray>(d);
        break;
#ifndef QT_NO_GEOM_VARIANT
    case QVariant::Point:
        v_clear<QPoint>(d);
        break;
    case QVariant::PointF:
        v_clear<QPointF>(d);
        break;
    case QVariant::Size:
        v_clear<QSize>(d);
        break;
    case QVariant::SizeF:
        v_clear<QSizeF>(d);
        break;
    case QVariant::Rect:
        v_clear<QRect>(d);
        break;
    case QVariant::LineF:
        v_clear<QLineF>(d);
        break;
    case QVariant::Line:
        v_clear<QLine>(d);
        break;
    case QVariant::RectF:
        v_clear<QRectF>(d);
        break;
#endif
    case QVariant::Url:
        v_clear<QUrl>(d);
        break;
    case QVariant::Locale:
        v_clear<QLocale>(d);
        break;
#ifndef QT_NO_REGEXP
    case QVariant::RegExp:
        v_clear<QRegExp>(d);
        break;
#endif
    case QVariant::LongLong:
    case QVariant::ULongLong:
    case QVariant::Double:
        break;
    case QVariant::Invalid:
    case QVariant::UserType:
    case QVariant::Int:
    case QVariant::UInt:
    case QVariant::Bool:
        break;
    default:
        QMetaType::destroy(d->type, d->data.shared->ptr);
        delete d->data.shared;
        break;
    }

    d->type = QVariant::Invalid;
    d->is_null = true;
    d->is_shared = false;
}

static bool isNull(const QVariant::Private *d)
{
    switch(d->type) {
    case QVariant::String:
        return v_cast<QString>(d)->isNull();
    case QVariant::Char:
        return v_cast<QChar>(d)->isNull();
    case QVariant::Date:
        return v_cast<QDate>(d)->isNull();
    case QVariant::Time:
        return v_cast<QTime>(d)->isNull();
    case QVariant::DateTime:
        return v_cast<QDateTime>(d)->isNull();
    case QVariant::ByteArray:
        return v_cast<QByteArray>(d)->isNull();
    case QVariant::BitArray:
        return v_cast<QBitArray>(d)->isNull();
#ifndef QT_NO_GEOM_VARIANT
    case QVariant::Size:
        return v_cast<QSize>(d)->isNull();
    case QVariant::SizeF:
        return v_cast<QSizeF>(d)->isNull();
    case QVariant::Rect:
        return v_cast<QRect>(d)->isNull();
    case QVariant::Line:
        return v_cast<QLine>(d)->isNull();
    case QVariant::LineF:
        return v_cast<QLineF>(d)->isNull();
    case QVariant::RectF:
        return v_cast<QRectF>(d)->isNull();
    case QVariant::Point:
        return v_cast<QPoint>(d)->isNull();
    case QVariant::PointF:
        return v_cast<QPointF>(d)->isNull();
#endif
    case QVariant::Url:
    case QVariant::Locale:
    case QVariant::RegExp:
    case QVariant::StringList:
    case QVariant::Map:
    case QVariant::List:
    case QVariant::Invalid:
    case QVariant::UserType:
    case QVariant::Int:
    case QVariant::UInt:
    case QVariant::LongLong:
    case QVariant::ULongLong:
    case QVariant::Bool:
    case QVariant::Double:
        break;
    }
    return d->is_null;
}

static bool compare(const QVariant::Private *a, const QVariant::Private *b)
{
    switch(a->type) {
    case QVariant::List:
        return *v_cast<QVariantList>(a) == *v_cast<QVariantList>(b);
    case QVariant::Map: {
        const QVariantMap *m1 = v_cast<QVariantMap>(a);
        const QVariantMap *m2 = v_cast<QVariantMap>(b);
        if (m1->count() != m2->count())
            return false;
        QVariantMap::ConstIterator it = m1->constBegin();
        QVariantMap::ConstIterator it2 = m2->constBegin();
        while (it != m1->constEnd()) {
            if (*it != *it2)
                return false;
            ++it;
            ++it2;
        }
        return true;
    }
    case QVariant::String:
        return *v_cast<QString>(a) == *v_cast<QString>(b);
    case QVariant::Char:
        return *v_cast<QChar>(a) == *v_cast<QChar>(b);
    case QVariant::StringList:
        return *v_cast<QStringList>(a) == *v_cast<QStringList>(b);
#ifndef QT_NO_GEOM_VARIANT
    case QVariant::Size:
        return *v_cast<QSize>(a) == *v_cast<QSize>(b);
    case QVariant::SizeF:
        return *v_cast<QSizeF>(a) == *v_cast<QSizeF>(b);
    case QVariant::Rect:
        return *v_cast<QRect>(a) == *v_cast<QRect>(b);
    case QVariant::Line:
        return *v_cast<QLine>(a) == *v_cast<QLine>(b);
    case QVariant::LineF:
        return *v_cast<QLineF>(a) == *v_cast<QLineF>(b);
    case QVariant::RectF:
        return *v_cast<QRectF>(a) == *v_cast<QRectF>(b);
    case QVariant::Point:
        return *v_cast<QPoint>(a) == *v_cast<QPoint>(b);
    case QVariant::PointF:
        return *v_cast<QPointF>(a) == *v_cast<QPointF>(b);
#endif
    case QVariant::Url:
        return *v_cast<QUrl>(a) == *v_cast<QUrl>(b);
    case QVariant::Locale:
        return *v_cast<QLocale>(a) == *v_cast<QLocale>(b);
#ifndef QT_NO_REGEXP
    case QVariant::RegExp:
        return *v_cast<QRegExp>(a) == *v_cast<QRegExp>(b);
#endif
    case QVariant::Int:
        return a->data.i == b->data.i;
    case QVariant::UInt:
        return a->data.u == b->data.u;
    case QVariant::LongLong:
        return a->data.ll == b->data.ll;
    case QVariant::ULongLong:
        return a->data.ull == b->data.ull;
    case QVariant::Bool:
        return a->data.b == b->data.b;
    case QVariant::Double:
        return a->data.d == b->data.d;
    case QVariant::Date:
        return *v_cast<QDate>(a) == *v_cast<QDate>(b);
    case QVariant::Time:
        return *v_cast<QTime>(a) == *v_cast<QTime>(b);
    case QVariant::DateTime:
        return *v_cast<QDateTime>(a) == *v_cast<QDateTime>(b);
    case QVariant::ByteArray:
        return *v_cast<QByteArray>(a) == *v_cast<QByteArray>(b);
    case QVariant::BitArray:
        return *v_cast<QBitArray>(a) == *v_cast<QBitArray>(b);
    case QVariant::Invalid:
        return true;
    default:
        break;
    }
    if (!QMetaType::isRegistered(a->type))
        qFatal("QVariant::compare: type %d unknown to QVariant.", a->type);

    /* The reason we cannot place this test in a case branch above for the types
     * QMetaType::VoidStar, QMetaType::QObjectStar and so forth, is that it wouldn't include
     * user defined pointer types. */
    const char *const typeName = QMetaType::typeName(a->type);
    if (typeName[qstrlen(typeName) - 1] == '*')
        return *static_cast<void **>(a->data.shared->ptr) ==
               *static_cast<void **>(b->data.shared->ptr);

    return a->data.shared->ptr == b->data.shared->ptr;
}

/*!
  \internal
 */
static qlonglong qMetaTypeNumber(const QVariant::Private *d)
{
    switch (d->type) {
    case QMetaType::Int:
        return d->data.i;
    case QMetaType::LongLong:
        return d->data.ll;
    case QMetaType::Char:
        return qlonglong(*static_cast<signed char *>(d->data.shared->ptr));
    case QMetaType::Short:
        return qlonglong(*static_cast<short *>(d->data.shared->ptr));
    case QMetaType::Long:
        return qlonglong(*static_cast<long *>(d->data.shared->ptr));
    case QMetaType::Float:
        return qRound64(*static_cast<float *>(d->data.shared->ptr));
    case QVariant::Double:
        return qRound64(d->data.d);
    }
    Q_ASSERT(false);
    return 0;
}

static qulonglong qMetaTypeUNumber(const QVariant::Private *d)
{
    switch (d->type) {
    case QVariant::UInt:
        return d->data.u;
    case QVariant::ULongLong:
        return d->data.ull;
    case QMetaType::UChar:
        return qulonglong(*static_cast<unsigned char *>(d->data.shared->ptr));
    case QMetaType::UShort:
        return qulonglong(*static_cast<ushort *>(d->data.shared->ptr));
    case QMetaType::ULong:
        return qulonglong(*static_cast<ulong *>(d->data.shared->ptr));
    }
    Q_ASSERT(false);
    return 0;
}

static qlonglong qConvertToNumber(const QVariant::Private *d, bool *ok)
{