/src/corelib/kernel/qmetaobject.cpp

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#include "qmetaobject.h"
#include "qmetatype.h"
#include "qobject.h"

#include <qcoreapplication.h>
#include <qcoreevent.h>
#include <qdatastream.h>
#include <qstringlist.h>
#include <qthread.h>
#include <qvarlengtharray.h>
#include <qvariant.h>
#include <qhash.h>
#include <qdebug.h>
#include <qsemaphore.h>

#include "private/qobject_p.h"
#include "private/qmetaobject_p.h"

#include <ctype.h>

QT_BEGIN_NAMESPACE

/*!
    \class QMetaObject

    \brief The QMetaObject class contains meta-information about Qt
    objects.

    \ingroup objectmodel

    The Qt \l{Meta-Object System} in Qt is responsible for the
    signals and slots inter-object communication mechanism, runtime
    type information, and the Qt property system. A single
    QMetaObject instance is created for each QObject subclass that is
    used in an application, and this instance stores all the
    meta-information for the QObject subclass. This object is
    available as QObject::metaObject().

    This class is not normally required for application programming,
    but it is useful if you write meta-applications, such as scripting
    engines or GUI builders.

    The functions you are most likely to find useful are these:
    \list
    \o className() returns the name of a class.
    \o superClass() returns the superclass's meta-object.
    \o method() and methodCount() provide information
       about a class's meta-methods (signals, slots and other
       \l{Q_INVOKABLE}{invokable} member functions).
    \o enumerator() and enumeratorCount() and provide information about
       a class's enumerators.
    \o propertyCount() and property() provide information about a
       class's properties.
    \o constructor() and constructorCount() provide information
       about a class's meta-constructors.
    \endlist

    The index functions indexOfConstructor(), indexOfMethod(),
    indexOfEnumerator(), and indexOfProperty() map names of constructors,
    member functions, enumerators, or properties to indexes in the
    meta-object. For example, Qt uses indexOfMethod() internally when you
    connect a signal to a slot.

    Classes can also have a list of \e{name}--\e{value} pairs of
    additional class information, stored in QMetaClassInfo objects.
    The number of pairs is returned by classInfoCount(), single pairs
    are returned by classInfo(), and you can search for pairs with
    indexOfClassInfo().

    \sa QMetaClassInfo, QMetaEnum, QMetaMethod, QMetaProperty, QMetaType,
        {Meta-Object System}
*/

/*!
    \enum QMetaObject::Call

    \internal

    \value InvokeSlot
    \value EmitSignal
    \value ReadProperty
    \value WriteProperty
    \value ResetProperty
    \value QueryPropertyDesignable
    \value QueryPropertyScriptable
    \value QueryPropertyStored
    \value QueryPropertyEditable
    \value QueryPropertyUser
    \value CreateInstance
*/

/*!
    \enum QMetaMethod::Access

    This enum describes the access level of a method, following the conventions used in C++.

    \value Private
    \value Protected
    \value Public
*/

static inline const QMetaObjectPrivate *priv(const uint* data)
{ return reinterpret_cast<const QMetaObjectPrivate*>(data); }


/*!
    \since 4.5

    Constructs a new instance of this class. You can pass up to ten arguments
    (\a val0, \a val1, \a val2, \a val3, \a val4, \a val5, \a val6, \a val7,
    \a val8, and \a val9) to the constructor. Returns the new object, or 0 if
    no suitable constructor is available.

    Note that only constructors that are declared with the Q_INVOKABLE
    modifier are made available through the meta-object system.

    \sa Q_ARG(), constructor()
*/
QObject *QMetaObject::newInstance(QGenericArgument val0,
                                  QGenericArgument val1,
                                  QGenericArgument val2,
                                  QGenericArgument val3,
                                  QGenericArgument val4,
                                  QGenericArgument val5,
                                  QGenericArgument val6,
                                  QGenericArgument val7,
                                  QGenericArgument val8,
                                  QGenericArgument val9) const
{
    QByteArray constructorName = className();
    {
        int idx = constructorName.lastIndexOf(':');
        if (idx != -1)
            constructorName.remove(0, idx+1); // remove qualified part
    }
    QVarLengthArray<char, 512> sig;
    sig.append(constructorName.constData(), constructorName.length());
    sig.append('(');

    enum { MaximumParamCount = 10 };
    const char *typeNames[] = {val0.name(), val1.name(), val2.name(), val3.name(), val4.name(),
                               val5.name(), val6.name(), val7.name(), val8.name(), val9.name()};

    int paramCount;
    for (paramCount = 0; paramCount < MaximumParamCount; ++paramCount) {
        int len = qstrlen(typeNames[paramCount]);
        if (len <= 0)
            break;
        sig.append(typeNames[paramCount], len);
        sig.append(',');
    }
    if (paramCount == 0)
        sig.append(')'); // no parameters
    else
        sig[sig.size() - 1] = ')';
    sig.append('\0');

    int idx = indexOfConstructor(sig.constData());
    if (idx < 0) {
        QByteArray norm = QMetaObject::normalizedSignature(sig.constData());
        idx = indexOfConstructor(norm.constData());
    }
    if (idx < 0)
        return 0;

    QVariant ret(QMetaType::QObjectStar, (void*)0);
    void *param[] = {ret.data(), val0.data(), val1.data(), val2.data(), val3.data(), val4.data(),
                     val5.data(), val6.data(), val7.data(), val8.data(), val9.data()};

    if (static_metacall(CreateInstance, idx, param) >= 0)
        return 0;
    return *reinterpret_cast<QObject**>(param[0]);
}

/*!
    \internal
*/
int QMetaObject::static_metacall(Call cl, int idx, void **argv) const
{
    const QMetaObjectExtraData *extra = reinterpret_cast<const QMetaObjectExtraData *>(d.extradata);
    if (priv(d.data)->revision >= 6) {
        if (!extra || !extra->static_metacall)
            return 0;
        extra->static_metacall(0, cl, idx, argv);
        return -1;
    } else if (priv(d.data)->revision >= 2) {
        if (!extra || !extra->static_metacall)
            return 0;
        typedef int (*OldMetacall)(QMetaObject::Call, int, void **);
        OldMetacall o = reinterpret_cast<OldMetacall>(extra->static_metacall);
        return o(cl, idx, argv);
    }
    return 0;
}

/*!
    \internal
*/
int QMetaObject::metacall(QObject *object, Call cl, int idx, void **argv)
{
    if (QMetaObject *mo = object->d_ptr->metaObject)
        return static_cast<QAbstractDynamicMetaObject*>(mo)->metaCall(cl, idx, argv);
    else
        return object->qt_metacall(cl, idx, argv);
}

/*!
    \fn const char *QMetaObject::className() const

    Returns the class name.

    \sa superClass()
*/

/*!
    \fn QMetaObject *QMetaObject::superClass() const

    Returns the meta-object of the superclass, or 0 if there is no
    such object.

    \sa className()
*/

/*!
    \internal

    Returns \a obj if object \a obj inherits from this
    meta-object; otherwise returns 0.
*/
QObject *QMetaObject::cast(QObject *obj) const
{
    if (obj) {
        const QMetaObject *m = obj->metaObject();
        do {
            if (m == this)
                return obj;
        } while ((m = m->d.superdata));
    }
    return 0;
}

/*!
    \internal

    Returns \a obj if object \a obj inherits from this
    meta-object; otherwise returns 0.
*/
const QObject *QMetaObject::cast(const QObject *obj) const
{
    if (obj) {
        const QMetaObject *m = obj->metaObject();
        do {
            if (m == this)
                return obj;
        } while ((m = m->d.superdata));
    }
    return 0;
}

#ifndef QT_NO_TRANSLATION
/*!
    \internal
*/
QString QMetaObject::tr(const char *s, const char *c) const
{
    return QCoreApplication::translate(d.stringdata, s, c, QCoreApplication::CodecForTr);
}

/*!
    \internal
*/
QString QMetaObject::tr(const char *s, const char *c, int n) const
{
    return QCoreApplication::translate(d.stringdata, s, c, QCoreApplication::CodecForTr, n);
}

/*!
    \internal
*/
QString QMetaObject::trUtf8(const char *s, const char *c) const
{
    return QCoreApplication::translate(d.stringdata, s, c, QCoreApplication::UnicodeUTF8);
}

/*!
    \internal
*/
QString QMetaObject::trUtf8(const char *s, const char *c, int n) const
{
    return QCoreApplication::translate(d.stringdata, s, c, QCoreApplication::UnicodeUTF8, n);
}
#endif // QT_NO_TRANSLATION

/*!
    Returns the method offset for this class; i.e. the index position
    of this class's first member function.

    The offset is the sum of all the methods in the class's
    superclasses (which is always positive since QObject has the
    deleteLater() slot and a destroyed() signal).

    \sa method(), methodCount(), indexOfMethod()
*/
int QMetaObject::methodOffset() const
{
    int offset = 0;
    const QMetaObject *m = d.superdata;
    while (m) {
        offset += priv(m->d.data)->methodCount;
        m = m->d.superdata;
    }
    return offset;
}


/*!
    Returns the enumerator offset for this class; i.e. the index
    position of this class's first enumerator.

    If the class has no superclasses with enumerators, the offset is
    0; otherwise the offset is the sum of all the enumerators in the
    class's superclasses.

    \sa enumerator(), enumeratorCount(), indexOfEnumerator()
*/
int QMetaObject::enumeratorOffset() const
{
    int offset = 0;
    const QMetaObject *m = d.superdata;
    while (m) {
        offset += priv(m->d.data)->enumeratorCount;
        m = m->d.superdata;
    }
    return offset;
}

/*!
    Returns the property offset for this class; i.e. the index
    position of this class's first property.

    The offset is the sum of all the properties in the class's
    superclasses (which is always positive since QObject has the
    name() property).

    \sa property(), propertyCount(), indexOfProperty()
*/
int QMetaObject::propertyOffset() const
{
    int offset = 0;
    const QMetaObject *m = d.superdata;
    while (m) {
        offset += priv(m->d.data)->propertyCount;
        m = m->d.superdata;
    }
    return offset;
}

/*!
    Returns the class information offset for this class; i.e. the
    index position of this class's first class information item.

    If the class has no superclasses with class information, the
    offset is 0; otherwise the offset is the sum of all the class
    information items in the class's superclasses.

    \sa classInfo(), classInfoCount(), indexOfClassInfo()
*/
int QMetaObject::classInfoOffset() const
{
    int offset = 0;
    const QMetaObject *m = d.superdata;
    while (m) {
        offset += priv(m->d.data)->classInfoCount;
        m = m->d.superdata;
    }
    return offset;
}

/*!
    \since 4.5

    Returns the number of constructors in this class.

    \sa constructor(), indexOfConstructor()
*/
int QMetaObject::constructorCount() const
{
    if (priv(d.data)->revision < 2)
        return 0;
    return priv(d.data)->constructorCount;
}

/*!
    Returns the number of methods known to the meta-object system in this class,
    including the number of properties provided by each base class. These
    include signals and slots as well as member functions declared with the
    Q_INVOKABLE macro.

    Use code like the following to obtain a QStringList containing the methods
    specific to a given class:

    \snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp methodCount

    \sa method(), methodOffset(), indexOfMethod()
*/
int QMetaObject::methodCount() const
{
    int n = priv(d.data)->methodCount;
    const QMetaObject *m = d.superdata;
    while (m) {
        n += priv(m->d.data)->methodCount;
        m = m->d.superdata;
    }
    return n;
}

/*!
    Returns the number of enumerators in this class.

    \sa enumerator(), enumeratorOffset(), indexOfEnumerator()
*/
int QMetaObject::enumeratorCount() const
{
    int n = priv(d.data)->enumeratorCount;
    const QMetaObject *m = d.superdata;
    while (m) {
        n += priv(m->d.data)->enumeratorCount;
        m = m->d.superdata;
    }
    return n;
}

/*!
    Returns the number of properties in this class, including the number of
    properties provided by each base class.

    Use code like the following to obtain a QStringList containing the properties
    specific to a given class:

    \snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp propertyCount

    \sa property(), propertyOffset(), indexOfProperty()
*/
int QMetaObject::propertyCount() const
{
    int n = priv(d.data)->propertyCount;
    const QMetaObject *m = d.superdata;
    while (m) {
        n += priv(m->d.data)->propertyCount;
        m = m->d.superdata;
    }
    return n;
}

/*!
    Returns the number of items of class information in this class.

    \sa classInfo(), classInfoOffset(), indexOfClassInfo()
*/
int QMetaObject::classInfoCount() const
{
    int n = priv(d.data)->classInfoCount;
    const QMetaObject *m = d.superdata;
    while (m) {
        n += priv(m->d.data)->classInfoCount;
        m = m->d.superdata;
    }
    return n;
}

/** \internal
* helper function for indexOf{Method,Slot,Signal}, returns the relative index of the method within
* the baseObject
* \a MethodType might be MethodSignal or MethodSlot, or 0 to match everything.
* \a normalizeStringData set to true if we should do a second pass for old moc generated files normalizing all the symbols.
*/
template<int MethodType>
static inline int indexOfMethodRelative(const QMetaObject **baseObject,
                                        const char *method,
                                        bool normalizeStringData)
{
    for (const QMetaObject *m = *baseObject; m; m = m->d.superdata) {
        int i = (MethodType == MethodSignal && priv(m->d.data)->revision >= 4)
                ? (priv(m->d.data)->signalCount - 1) : (priv(m->d.data)->methodCount - 1);
        const int end = (MethodType == MethodSlot && priv(m->d.data)->revision >= 4)
                        ? (priv(m->d.data)->signalCount) : 0;
        if (!normalizeStringData) {
            for (; i >= end; --i) {
                const char *stringdata = m->d.stringdata + m->d.data[priv(m->d.data)->methodData + 5*i];
                if (method[0] == stringdata[0] && strcmp(method + 1, stringdata + 1) == 0) {
                    *baseObject = m;
                    return i;
                }
            }
        } else if (priv(m->d.data)->revision < 5) {
            for (; i >= end; --i) {
                const char *stringdata = (m->d.stringdata + m->d.data[priv(m->d.data)->methodData + 5 * i]);
                const QByteArray normalizedSignature = QMetaObject::normalizedSignature(stringdata);
                if (normalizedSignature == method) {
                    *baseObject = m;
                    return i;
                }
            }
        }
    }
    return -1;
}


/*!
    \since 4.5

    Finds \a constructor and returns its index; otherwise returns -1.

    Note that the \a constructor has to be in normalized form, as returned
    by normalizedSignature().

    \sa constructor(), constructorCount(), normalizedSignature()
*/
int QMetaObject::indexOfConstructor(const char *constructor) const
{
    if (priv(d.data)->revision < 2)
        return -1;
    for (int i = priv(d.data)->constructorCount-1; i >= 0; --i) {
        const char *data = d.stringdata + d.data[priv(d.data)->constructorData + 5*i];
        if (data[0] == constructor[0] && strcmp(constructor + 1, data + 1) == 0) {
            return i;
        }
    }
    return -1;
}

/*!
    Finds \a method and returns its index; otherwise returns -1.

    Note that the \a method has to be in normalized form, as returned
    by normalizedSignature().

    \sa method(), methodCount(), methodOffset(), normalizedSignature()
*/
int QMetaObject::indexOfMethod(const char *method) const
{
    const QMetaObject *m = this;
    int i = indexOfMethodRelative<0>(&m, method, false);
    if (i < 0) {
        m = this;
        i = indexOfMethodRelative<0>(&m, method, true);
    }
    if (i >= 0)
        i += m->methodOffset();
    return i;
}

/*!
    Finds \a signal and returns its index; otherwise returns -1.

    This is the same as indexOfMethod(), except that it will return
    -1 if the method exists but isn't a signal.

    Note that the \a signal has to be in normalized form, as returned
    by normalizedSignature().

    \sa indexOfMethod(), normalizedSignature(), method(), methodCount(), methodOffset()
*/
int QMetaObject::indexOfSignal(const char *signal) const
{
    const QMetaObject *m = this;
    int i = QMetaObjectPrivate::indexOfSignalRelative(&m, signal, false);
    if (i < 0) {
        m = this;
        i = QMetaObjectPrivate::indexOfSignalRelative(&m, signal, true);
    }
    if (i >= 0)
        i += m->methodOffset();
    return i;
}

/*! \internal
    Same as QMetaObject::indexOfSignal, but the result is the local offset to the base object.

    \a baseObject will be adjusted to the enclosing QMetaObject, or 0 if the signal is not found
*/
int QMetaObjectPrivate::indexOfSignalRelative(const QMetaObject **baseObject,
                                              const char *signal,
                                              bool normalizeStringData)
{
    int i = indexOfMethodRelative<MethodSignal>(baseObject, signal, normalizeStringData);
#ifndef QT_NO_DEBUG
    const QMetaObject *m = *baseObject;
    if (i >= 0 && m && m->d.superdata) {
        int conflict = m->d.superdata->indexOfMethod(signal);
        if (conflict >= 0)
            qWarning("QMetaObject::indexOfSignal: signal %s from %s redefined in %s",
                     signal, m->d.superdata->d.stringdata, m->d.stringdata);
    }
#endif
    return i;
}

/*!
    Finds \a slot and returns its index; otherwise returns -1.

    This is the same as indexOfMethod(), except that it will return
    -1 if the method exists but isn't a slot.

    \sa indexOfMethod(), method(), methodCount(), methodOffset()
*/
int QMetaObject::indexOfSlot(const char *slot) const
{
    const QMetaObject *m = this;
    int i = QMetaObjectPrivate::indexOfSlotRelative(&m, slot, false);
    if (i < 0)
        i = QMetaObjectPrivate::indexOfSlotRelative(&m, slot, true);
    if (i >= 0)
        i += m->methodOffset();
    return i;
}

// same as indexOfSignalRelative but for slots.
int QMetaObjectPrivate::indexOfSlotRelative(const QMetaObject **m,
                                    const char *slot,
                                    bool normalizeStringData)
{
    return indexOfMethodRelative<MethodSlot>(m, slot, normalizeStringData);
}

static const QMetaObject *QMetaObject_findMetaObject(const QMetaObject *self, const char *name)
{
    while (self) {
        if (strcmp(self->d.stringdata, name) == 0)
            return self;
        if (self->d.extradata) {
#ifdef Q_NO_DATA_RELOCATION
            const QMetaObjectAccessor *e;
            Q_ASSERT(priv(self->d.data)->revision >= 2);
#else
            const QMetaObject **e;
            if (priv(self->d.data)->revision < 2) {
                e = (const QMetaObject**)(self->d.extradata);
            } else
#endif
            {
                const QMetaObjectExtraData *extra = (const QMetaObjectExtraData*)(self->d.extradata);
                e = extra->objects;
            }
            if (e) {
                while (*e) {
#ifdef Q_NO_DATA_RELOCATION
                    if (const QMetaObject *m =QMetaObject_findMetaObject(&((*e)()), name))
#else
                    if (const QMetaObject *m =QMetaObject_findMetaObject((*e), name))
#endif
                        return m;
                    ++e;
                }
            }
        }
        self = self->d.superdata;
    }
    return self;
}

/*!
    Finds enumerator \a name and returns its index; otherwise returns
    -1.

    \sa enumerator(), enumeratorCount(), enumeratorOffset()
*/
int QMetaObject::indexOfEnumerator(const char *name) const
{
    const QMetaObject *m = this;
    while (m) {
        const QMetaObjectPrivate *d = priv(m->d.data);
        for (int i = d->enumeratorCount - 1; i >= 0; --i) {
            const char *prop = m->d.stringdata + m->d.data[d->enumeratorData + 4*i];
            if (name[0] == prop[0] && strcmp(name + 1, prop + 1) == 0) {
                i += m->enumeratorOffset();
                return i;
            }
        }
        m = m->d.superdata;
    }
    return -1;
}

/*!
    Finds property \a name and returns its index; otherwise returns
    -1.

    \sa property(), propertyCount(), propertyOffset()
*/
int QMetaObject::indexOfProperty(const char *name) const
{
    const QMetaObject *m = this;
    while (m) {
        const QMetaObjectPrivate *d = priv(m->d.data);
        for (int i = d->propertyCount-1; i >= 0; --i) {
            const char *prop = m->d.stringdata + m->d.data[d->propertyData + 3*i];
            if (name[0] == prop[0] && strcmp(name + 1, prop + 1) == 0) {
                i += m->propertyOffset();
                return i;
            }
        }
        m = m->d.superdata;
    }

    if (priv(this->d.data)->revision >= 3 && (priv(this->d.data)->flags & DynamicMetaObject)) {
        QAbstractDynamicMetaObject *me = 
            const_cast<QAbstractDynamicMetaObject *>(static_cast<const QAbstractDynamicMetaObject *>(this));

        return me->createProperty(name, 0);
    }

    return -1;
}

/*!
    Finds class information item \a name and returns its index;
    otherwise returns -1.

    \sa classInfo(), classInfoCount(), classInfoOffset()
*/
int QMetaObject::indexOfClassInfo(const char *name) const
{
    int i = -1;
    const QMetaObject *m = this;
    while (m && i < 0) {
        for (i = priv(m->d.data)->classInfoCount-1; i >= 0; --i)
            if (strcmp(name, m->d.stringdata
                       + m->d.data[priv(m->d.data)->classInfoData + 2*i]) == 0) {
                i += m->classInfoOffset();
                break;
            }
        m = m->d.superdata;
    }
    return i;
}

/*!
    \since 4.5

    Returns the meta-data for the constructor with the given \a index.

    \sa constructorCount(), newInstance()
*/
QMetaMethod QMetaObject::constructor(int index) const
{
    int i = index;
    QMetaMethod result;
    if (priv(d.data)->revision >= 2 && i >= 0 && i < priv(d.data)->constructorCount) {
        result.mobj = this;
        result.handle = priv(d.data)->constructorData + 5*i;
    }
    return result;
}

/*!
    Returns the meta-data for the method with the given \a index.

    \sa methodCount(), methodOffset(), indexOfMethod()
*/
QMetaMethod QMetaObject::method(int index) const
{
    int i = index;
    i -= methodOffset();
    if (i < 0 && d.superdata)
        return d.superdata->method(index);

    QMetaMethod result;
    if (i >= 0 && i < priv(d.data)->methodCount) {
        result.mobj = this;
        result.handle = priv(d.data)->methodData + 5*i;
    }
    return result;
}

/*!
    Returns the meta-data for the enumerator with the given \a index.

    \sa enumeratorCount(), enumeratorOffset(), indexOfEnumerator()
*/
QMetaEnum QMetaObject::enumerator(int index) const
{
    int i = index;
    i -= enumeratorOffset();
    if (i < 0 && d.superdata)
        return d.superdata->enumerator(index);

    QMetaEnum result;
    if (i >= 0 && i < priv(d.data)->enumeratorCount) {
        result.mobj = this;
        result.handle = priv(d.data)->enumeratorData + 4*i;
    }
    return result;
}

/*!
    Returns the meta-data for the property with the given \a index.
    If no such property exists, a null QMetaProperty is returned.

    \sa propertyCount(), propertyOffset(), indexOfProperty()
*/
QMetaProperty QMetaObject::property(int index) const
{
    int i = index;
    i -= propertyOffset();
    if (i < 0 && d.superdata)
        return d.superdata->property(index);

    QMetaProperty result;
    if (i >= 0 && i < priv(d.data)->propertyCount) {
        int handle = priv(d.data)->propertyData + 3*i;
        int flags = d.data[handle + 2];
        const char *type = d.stringdata + d.data[handle + 1];
        result.mobj = this;
        result.handle = handle;
        result.idx = i;

        if (flags & EnumOrFlag) {
            result.menum = enumerator(indexOfEnumerator(type));
            if (!result.menum.isValid()) {
                QByteArray enum_name = type;
                QByteArray scope_name = d.stringdata;
                int s = enum_name.lastIndexOf("::");
                if (s > 0) {
                    scope_name = enum_name.left(s);
                    enum_name = enum_name.mid(s + 2);
                }
                const QMetaObject *scope = 0;
                if (scope_name == "Qt")
                    scope = &QObject::staticQtMetaObject;
                else
                    scope = QMetaObject_findMetaObject(this, scope_name);
                if (scope)
                    result.menum = scope->enumerator(scope->indexOfEnumerator(enum_name));
            }
        }
    }
    return result;
}

/*!
    \since 4.2

    Returns the property that has the \c USER flag set to true.

    \sa QMetaProperty::isUser()
*/
QMetaProperty QMetaObject::userProperty() const
{
    const int propCount = propertyCount();
    for (int i = propCount - 1; i >= 0; --i) {
        const QMetaProperty prop = property(i);
        if (prop.isUser())
            return prop;
    }
    return QMetaProperty();
}

/*!
    Returns the meta-data for the item of class information with the
    given \a index.

    Example:

    \snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 0

    \sa classInfoCount(), classInfoOffset(), indexOfClassInfo()
 */
QMetaClassInfo QMetaObject::classInfo(int index) const
{
    int i = index;
    i -= classInfoOffset();
    if (i < 0 && d.superdata)
        return d.superdata->classInfo(index);

    QMetaClassInfo result;
    if (i >= 0 && i < priv(d.data)->classInfoCount) {
        result.mobj = this;
        result.handle = priv(d.data)->classInfoData + 2*i;
    }
    return result;
}

/*!
    Returns true if the \a signal and \a method arguments are
    compatible; otherwise returns false.

    Both \a signal and \a method are expected to be normalized.

    \sa normalizedSignature()
*/
bool QMetaObject::checkConnectArgs(const char *signal, const char *method)
{
    const char *s1 = signal;
    const char *s2 = method;
    while (*s1++ != '(') { }                        // scan to first '('
    while (*s2++ != '(') { }
    if (*s2 == ')' || qstrcmp(s1,s2) == 0)        // method has no args or
        return true;                                //   exact match
    int s1len = qstrlen(s1);
    int s2len = qstrlen(s2);
    if (s2len < s1len && strncmp(s1,s2,s2len-1)==0 && s1[s2len-1]==',')
        return true;                                // method has less args
    return false;
}

static void qRemoveWhitespace(const char *s, char *d)
{
    char last = 0;
    while (*s && is_space(*s))
        s++;
    while (*s) {
        while (*s && !is_space(*s))
            last = *d++ = *s++;
        while (*s && is_space(*s))
            s++;
        if (*s && ((is_ident_char(*s) && is_ident_char(last))
                   || ((*s == ':') && (last == '<')))) {
            last = *d++ = ' ';
        }
    }
    *d = '\0';
}

static char *qNormalizeType(char *d, int &templdepth, QByteArray &result)
{
    const char *t = d;
    while (*d && (templdepth
                   || (*d != ',' && *d != ')'))) {
        if (*d == '<')
            ++templdepth;
        if (*d == '>')
            --templdepth;
        ++d;
    }
    if (strncmp("void", t, d - t) != 0)
        result += normalizeTypeInternal(t, d);

    return d;
}


/*!
    \since 4.2

    Normalizes a \a type.

    See QMetaObject::normalizedSignature() for a description on how
    Qt normalizes.

    Example:

    \snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 1

    \sa normalizedSignature()
 */
QByteArray QMetaObject::normalizedType(const char *type)
{
    QByteArray result;

    if (!type || !*type)
        return result;

    QVarLengthArray<char> stackbuf(qstrlen(type) + 1);
    qRemoveWhitespace(type, stackbuf.data());
    int templdepth = 0;
    qNormalizeType(stackbuf.data(), templdepth, result);

    return result;
}

/*!
    Normalizes the signature of the given \a method.

    Qt uses normalized signatures to decide whether two given signals
    and slots are compatible. Normalization reduces whitespace to a
    minimum, moves 'const' to the front where appropriate, removes
    'const' from value types and replaces const references with
    values.

    \sa checkConnectArgs(), normalizedType()
 */
QByteArray QMetaObject::normalizedSignature(const char *method)
{
    QByteArray result;
    if (!method || !*method)
        return result;
    int len = int(strlen(method));
    QVarLengthArray<char> stackbuf(len + 1);
    char *d = stackbuf.data();
    qRemoveWhitespace(method, d);

    result.reserve(len);

    int argdepth = 0;
    int templdepth = 0;
    while (*d) {
        if (argdepth == 1) {
            d = qNormalizeType(d, templdepth, result);
            if (!*d) //most likely an invalid signature.
                break;
        }
        if (*d == '(')
            ++argdepth;
        if (*d == ')')
            --argdepth;
        result += *d++;
    }

    return result;
}

enum { MaximumParamCount = 11 }; // up to 10 arguments + 1 return value

/*!
    Invokes the \a member (a signal or a slot name) on the object \a
    obj. Returns true if the member could be invoked. Returns false
    if there is no such member or the parameters did not match.

    The invocation can be either synchronous or asynchronous,
    depending on \a type:

    \list
    \o If \a type is Qt::DirectConnection, the member will be invoked immediately.

    \o If \a type is Qt::QueuedConnection,
       a QEvent will be sent and the member is invoked as soon as the application
       enters the main event loop.

    \o If \a type is Qt::BlockingQueuedConnection, the method will be invoked in
       the same way as for Qt::QueuedConnection, except that the current thread
       will block until the event is delivered. Using this connection type to
       communicate between objects in the same thread will lead to deadlocks.

    \o If \a type is Qt::AutoConnection, the member is invoked
       synchronously if \a obj lives in the same thread as the
       caller; otherwise it will invoke the member asynchronously.
    \endlist

    The return value of the \a member function call is placed in \a
    ret. If the invocation is asynchronous, the return value cannot
    be evaluated. You can pass up to ten arguments (\a val0, \a val1,
    \a val2, \a val3, \a val4, \a val5, \a val6, \a val7, \a val8,
    and \a val9) to the \a member function.

    QGenericArgument and QGenericReturnArgument are internal
    helper classes. Because signals and slots can be dynamically
    invoked, you must enclose the arguments using the Q_ARG() and
    Q_RETURN_ARG() macros. Q_ARG() takes a type name and a
    const reference of that type; Q_RETURN_ARG() takes a type name
    and a non-const reference.

    You only need to pass the name of the signal or slot to this function,
    not the entire signature. For example, to asynchronously invoke
    the \l{QPushButton::animateClick()}{animateClick()} slot on a
    QPushButton, use the following code:

    \snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 2

    With asynchronous method invocations, the parameters must be of
    types that are known to Qt's meta-object system, because Qt needs
    to copy the arguments to store them in an event behind the
    scenes. If you try to use a queued connection and get the error
    message

    \snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 3

    call qRegisterMetaType() to register the data type before you
    call invokeMethod().

    To synchronously invoke the \c compute(QString, int, double) slot on
    some arbitrary object \c obj retrieve its return value:

    \snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 4

    If the "compute" slot does not take exactly one QString, one int
    and one double in the specified order, the call will fail.

    \sa Q_ARG(), Q_RETURN_ARG(), qRegisterMetaType(), QMetaMethod::invoke()
*/
bool QMetaObject::invokeMethod(QObject *obj,
                               const char *member,
                               Qt::ConnectionType type,
                               QGenericReturnArgument ret,
                               QGenericArgument val0,
                               QGenericArgument val1,
                               QGenericArgument val2,
                               QGenericArgument val3,
                               QGenericArgument val4,
                               QGenericArgument val5,
                               QGenericArgument val6,
                               QGenericArgument val7,
                               QGenericArgument val8,
                               QGenericArgument val9)
{
    if (!obj)
        return false;

    QVarLengthArray<char, 512> sig;
    int len = qstrlen(member);
    if (len <= 0)
        return false;
    sig.append(member, len);
    sig.append('(');

    const char *typeNames[] = {ret.name(), val0.name(), val1.name(), val2.name(), val3.name(),
                               val4.name(), val5.name(), val6.name(), val7.name(), val8.name(),
                               val9.name()};

    int paramCount;
    for (paramCount = 1; paramCount < MaximumParamCount; ++paramCount) {
        len = qstrlen(typeNames[paramCount]);
        if (len <= 0)
            break;
        sig.append(typeNames[paramCount], len);
        sig.append(',');
    }
    if (paramCount == 1)
        sig.append(')'); // no parameters
    else
        sig[sig.size() - 1] = ')';
    sig.append('\0');

    int idx = obj->metaObject()->indexOfMethod(sig.constData());
    if (idx < 0) {
        QByteArray norm = QMetaObject::normalizedSignature(sig.constData());
        idx = obj->metaObject()->indexOfMethod(norm.constData());
    }

    if (idx < 0 || idx >= obj->metaObject()->methodCount()) {
        qWarning("QMetaObject::invokeMethod: No such method %s::%s",
                 obj->metaObject()->className(), sig.constData());
        return false;
    }
    QMetaMethod method = obj->metaObject()->method(idx);
    return method.invoke(obj, type, ret,
                         val0, val1, val2, val3, val4, val5, val6, val7, val8, val9);
}

/*! \fn bool QMetaObject::invokeMethod(QObject *obj, const char *member,
                                       QGenericReturnArgument ret,
                                       QGenericArgument val0 = QGenericArgument(0),
                                       QGenericArgument val1 = QGenericArgument(),
                                       QGenericArgument val2 = QGenericArgument(),
                                       QGenericArgument val3 = QGenericArgument(),
                                       QGenericArgument val4 = QGenericArgument(),
                                       QGenericArgument val5 = QGenericArgument(),
                                       QGenericArgument val6 = QGenericArgument(),
                                       QGenericArgument val7 = QGenericArgument(),
                                       QGenericArgument val8 = QGenericArgument(),
                                       QGenericArgument val9 = QGenericArgument());
    \overload invokeMethod()

    This overload always invokes the member using the connection type Qt::AutoConnection.
*/

/*! \fn bool QMetaObject::invokeMethod(QObject *obj, const char *member,
                             Qt::ConnectionType type,
                             QGenericArgument val0 = QGenericArgument(0),
                             QGenericArgument val1 = QGenericArgument(),
                             QGenericArgument val2 = QGenericArgument(),
                             QGenericArgument val3 = QGenericArgument(),
                             QGenericArgument val4 = QGenericArgument(),
                             QGenericArgument val5 = QGenericArgument(),
                             QGenericArgument val6 = QGenericArgument(),
                             QGenericArgument val7 = QGenericArgument(),
                             QGenericArgument val8 = QGenericArgument(),
                             QGenericArgument val9 = QGenericArgument())

    \overload invokeMethod()

    This overload can be used if the return value of the member is of no interest.
*/

/*!
    \fn bool QMetaObject::invokeMethod(QObject *obj, const char *member,
                             QGenericArgument val0 = QGenericArgument(0),
                             QGenericArgument val1 = QGenericArgument(),
                             QGenericArgument val2 = QGenericArgument(),
                             QGenericArgument val3 = QGenericArgument(),
                             QGenericArgument val4 = QGenericArgument(),
                             QGenericArgument val5 = QGenericArgument(),
                             QGenericArgument val6 = QGenericArgument(),
                             QGenericArgument val7 = QGenericArgument(),
                             QGenericArgument val8 = QGenericArgument(),
                             QGenericArgument val9 = QGenericArgument())

    \overload invokeMethod()

    This overload invokes the member using the connection type Qt::AutoConnection and
    ignores return values.
*/

/*!
    \class QMetaMethod

    \brief The QMetaMethod class provides meta-data about a member
    function.

    \ingroup objectmodel

    A QMetaMethod has a methodType(), a signature(), a list of
    parameterTypes() and parameterNames(), a return typeName(), a
    tag(), and an access() specifier. You can use invoke() to invoke
    the method on an arbitrary QObject.

    A method will only be registered with the meta-object system if it
    is a slot, a signal, or declared with the Q_INVOKABLE macro.
    Constructors can also be registered with Q_INVOKABLE.

    \sa QMetaObject, QMetaEnum, QMetaProperty, {Qt's Property System}
*/

/*!
    \enum QMetaMethod::Attributes

    \internal

    \value Compatibility
    \value Cloned
    \value Scriptable
*/

/*!
    \fn const QMetaObject *QMetaMethod::enclosingMetaObject() const
    \internal
*/

/*!
    \enum QMetaMethod::MethodType

    \value Method  The function is a plain member function.
    \value Signal  The function is a signal.
    \value Slot    The function is a slot.
    \value Constructor The function is a constructor.
*/

/*!
    \fn QMetaMethod::QMetaMethod()
    \internal
*/

/*!
    Returns the signature of this method (e.g.,
    \c{setValue(double)}).

    \sa parameterTypes(), parameterNames()
*/
const char *QMetaMethod::signature() const
{
    if (!mobj)
        return 0;
    return mobj->d.stringdata + mobj->d.data[handle];
}

/*!
    Returns a list of parameter types.

    \sa parameterNames(), signature()
*/
QList<QByteArray> QMetaMethod::parameterTypes() const
{
    QList<QByteArray> list;
    if (!mobj)
        return list;
    const char *signature = mobj->d.stringdata + mobj->d.data[handle];
    while (*signature && *signature != '(')
        ++signature;
    while (*signature && *signature != ')' && *++signature != ')') {
        const char *begin = signature;
        int level = 0;
        while (*signature && (level > 0 || *signature != ',') && *signature != ')') {
            if (*signature == '<')
                ++level;
            else if (*signature == '>')
                --level;
            ++signature;
        }
        list += QByteArray(begin, signature - begin);
    }
    return list;
}

/*!
    Returns a list of parameter names.

    \sa parameterTypes(), signature()
*/
QList<QByteArray> QMetaMethod::parameterNames() const
{
    QList<QByteArray> list;
    if (!mobj)
        return list;
    const char *names =  mobj->d.stringdata + mobj->d.data[handle + 1];
    if (*names == 0) {
        // do we have one or zero arguments?
        const char *signature = mobj->d.stringdata + mobj->d.data[handle];
        while (*signature && *signature != '(')
            ++signature;
        if (*++signature != ')')
            list += QByteArray();
    } else {
        --names;
        do {
            const char *begin = ++names;
            while (*names && *names != ',')
                ++names;
            list += QByteArray(begin, names - begin);
        } while (*names);
    }
    return list;
}


/*!
    Returns the return type of this method, or an empty string if the
    return type is \e void.
*/
const char *QMetaMethod::typeName() const
{
    if (!mobj)
        return 0;
    return mobj->d.stringdata + mobj->d.data[handle + 2];
}

/*!
    Returns the tag associated with this method.

    Tags are special macros recognized by \c moc that make it
    possible to add extra information about a method. For the moment,
    \c moc doesn't support any special tags.
*/
const char *QMetaMethod::tag() const
{
    if (!mobj)
        return 0;
    return mobj->d.stringdata + mobj->d.data[handle + 3];
}


/*! \internal */
int QMetaMethod::attributes() const
{
    if (!mobj)
        return false;
    return ((mobj->d.data[handle + 4])>>4);
}

/*!
  \since 4.6

  Returns this method's index.
*/
int QMetaMethod::methodIndex() const
{
    if (!mobj)
        return -1;
    return ((handle - priv(mobj->d.data)->methodData) / 5) + mobj->methodOffset();
}

/*!
    \internal

    Returns the method revision if one was
    specified by Q_REVISION, otherwise returns 0.
 */
int QMetaMethod::revision() const
{
    if (!mobj)
        return 0;
    if ((QMetaMethod::Access)(mobj->d.data[handle + 4] & MethodRevisioned)) {
        int offset = priv(mobj->d.data)->methodData
                     + priv(mobj->d.data)->methodCount * 5
                     + (handle - priv(mobj->d.data)->methodData) / 5;
        return mobj->d.data[offset];
    }
    return 0;
}

/*!
    Returns the access specification of this method (private,
    protected, or public).

    Signals are always protected, meaning that you can only emit them
    from the class or from a subclass.

    \sa methodType()
*/
QMetaMethod::Access QMetaMethod::access() const
{
    if (!mobj)
        return Private;
    return (QMetaMethod::Access)(mobj->d.data[handle + 4] & AccessMask);
}

/*!
    Returns the type of this method (signal, slot, or method).

    \sa access()
*/
QMetaMethod::MethodType QMetaMethod::methodType() const
{
    if (!mobj)
        return QMetaMethod::Method;
    return (QMetaMethod::MethodType)((mobj->d.data[handle + 4] & MethodTypeMask)>>2);
}

/*!
    Invokes this method on the object \a object. Returns true if the member could be invoked.
    Returns false if there is no such member or the parameters did not match.

    The invocation can be either synchronous or asynchronous, depending on the
    \a connectionType:

    \list
    \o If \a connectionType is Qt::DirectConnection, the member will be invoked immediately.

    \o If \a connectionType is Qt::QueuedConnection,
       a QEvent will be posted and the member is invoked as soon as the application
       enters the main event loop.

    \o If \a connectionType is Qt::AutoConnection, the member is invoked
       synchronously if \a object lives in the same thread as the
       caller; otherwise it will invoke the member asynchronously.
    \endlist

    The return value of this method call is placed in \a
    returnValue. If the invocation is asynchronous, the return value cannot
    be evaluated. You can pass up to ten arguments (\a val0, \a val1,
    \a val2, \a val3, \a val4, \a val5, \a val6, \a val7, \a val8,
    and \a val9) to this method call.

    QGenericArgument and QGenericReturnArgument are internal
    helper classes. Because signals and slots can be dynamically
    invoked, you must enclose the arguments using the Q_ARG() and
    Q_RETURN_ARG() macros. Q_ARG() takes a type name and a
    const reference of that type; Q_RETURN_ARG() takes a type name
    and a non-const reference.

    To asynchronously invoke the
    \l{QPushButton::animateClick()}{animateClick()} slot on a
    QPushButton:

    \snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 6

    With asynchronous method invocations, the parameters must be of
    types that are known to Qt's meta-object system, because Qt needs
    to copy the arguments to store them in an event behind the
    scenes. If you try to use a queued connection and get the error
    message

    \snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 7

    call qRegisterMetaType() to register the data type before you
    call QMetaMethod::invoke().

    To synchronously invoke the \c compute(QString, int, double) slot on
    some arbitrary object \c obj retrieve its return value:

    \snippet doc/src/snippets/code/src_corelib_kernel_qmetaobject.cpp 8

    QMetaObject::normalizedSignature() is used here to ensure that the format 
    of the signature is what invoke() expects.  E.g. extra whitespace is 
    removed.

    If the "compute" slot does not take exactly one QString, one int
    and one double in the specified order, the call will fail.

    \warning this method will not test the validity of the arguments: \a object
    must be an instance of the class of the QMetaObject of which this QMetaMethod
    has been constructed with.  The arguments must have the same type as the ones
    expected by the method, else, the behaviour is undefined.

    \sa Q_ARG(), Q_RETURN_ARG(), qRegisterMetaType(), QMetaObject::invokeMethod()
*/
bool QMetaMethod::invoke(QObject *object,
                         Qt::ConnectionType connectionType,
                         QGenericReturnArgument returnValue,
                         QGenericArgument val0,
                         QGenericArgument val1,
                         QGenericArgument val2,
                         QGenericArgument val3,
                         QGenericArgument val4,
                         QGenericArgument val5,
                         QGenericArgument val6,
                         QGenericArgument val7,
                         QGenericArgument val8,
                         QGenericArgument val9) const
{
    if (!object || !mobj)
        return false;

    Q_ASSERT(mobj->cast(object));

    // check return type
    if (returnValue.data()) {
        const char *retType = typeName();
        if (qstrcmp(returnValue.name(), retType) != 0) {
            // normalize the return value as well
            // the trick here is to make a function signature out of the return type
            // so that we can call normalizedSignature() and avoid duplicating code
            QByteArray unnormalized;
            int len = qstrlen(returnValue.name());

            unnormalized.reserve(len + 3);
            unnormalized = "_(";        // the function is called "_"
            unnormalized.append(returnValue.name());
            unnormalized.append(')');

            QByteArray normalized = QMetaObject::normalizedSignature(unnormalized.constData());
            normalized.truncate(normalized.length() - 1); // drop the ending ')'

            if (qstrcmp(normalized.constData() + 2, retType) != 0)
                return false;
        }
    }

    // check argument count (we don't allow invoking a method if given too few arguments)
    const char *typeNames[] = {
        returnValue.name(),
        val0.name(),
        val1.name(),
        val2.name(),
        val3.name(),
        val4.name(),
        val5.name(),
        val6.name(),
        val7.name(),
        val8.name(),
        val9.name()
    };
    int paramCount;
    for (paramCount = 1; paramCount < MaximumParamCount; ++paramCount) {
        if (qstrlen(typeNames[paramCount]) <= 0)
            break;
    }
    int metaMethodArgumentCount = 0;
    {
        // based on QMetaObject::parameterNames()
        const char *names = mobj->d.st…