C++ QScriptValueImpl::get方法代码示例

QScriptValueImpl Object::method_propertyIsEnumerable(QScriptContextPrivate *context, QScriptEnginePrivate *eng, QScriptClassInfo *)
{
    bool result = false;

    if (context->thisObject().isObject() && (context->argumentCount() > 0)) {
        QScriptValueImpl arg = context->argument(0);

        QScriptNameIdImpl *id = 0;
        if (arg.isString())
            id = arg.stringValue();

        if (! id || ! id->unique) {
            QString str = arg.toString();
            id = eng->nameId(str);
        }

        QScript::Member member;
        QScriptValueImpl base;
        QScriptValueImpl self = context->thisObject();
        if (self.resolve(id, &member, &base, QScriptValue::ResolveLocal, QScript::Read)) {
            result = ! member.dontEnum();
            if (result) {
                QScriptValueImpl tmp;
                base.get(member, &tmp);
                result = tmp.isValid();
            }
        }
    }

    return (QScriptValueImpl(result));
}

/*!
  Returns true if there is at least one item behind the iterator
  (i.e. the iterator is \e not at the front of the property sequence);
  otherwise returns false.

  \sa previous(), hasNext()
*/
bool QScriptValueIterator::hasPrevious() const
{
    Q_D(const QScriptValueIterator);
    if ((d->nextIndex != -1) && !d->forward)
        return true;

    if (!d->object.isObject())
        return false;

    QScriptValueImpl v = QScriptValuePrivate::valueOf(d->object);
    int i = d->index;
    if ((i != -1) && d->forward)
        ++i;

    bool found = false;
    while (! found && --i >= 0) {
        QScript::Member member;
        v.member(i, &member);
        found = member.isValid();
        if (found) {
            QScriptValueImpl vv;
            v.get(member, &vv);
            found = vv.isValid();
        }
    }

    QScriptValueIteratorPrivate *that;
    that = const_cast<QScriptValueIteratorPrivate*>(d);
    if (found) {
        that->forward = false;
        that->nextIndex = i;
        return true;
    } else {
        that->nextIndex = -1;
        return false;
    }

}

/*!
  Returns true if there is at least one item ahead of the iterator
  (i.e. the iterator is \e not at the back of the property sequence);
  otherwise returns false.

  \sa next(), hasPrevious()
*/
bool QScriptValueIterator::hasNext() const
{
    Q_D(const QScriptValueIterator);
    if ((d->nextIndex != -1) && d->forward)
        return true;

    if (!d->object.isObject())
        return false;

    QScriptValueImpl v = QScriptValuePrivate::valueOf(d->object);
    int i = d->index;
    if ((i != -1) && !d->forward)
        --i;

    int count = v.memberCount();
    bool found = false;
    while (! found && ++i < count) {
        QScript::Member member;
        v.member(i, &member);
        found = member.isValid();
        if (found && (member.isObjectProperty() || v.isArray())) {
            QScriptValueImpl vv;
            v.get(member, &vv);
            found = vv.isValid();
        }
    }

    QScriptValueIteratorPrivate *that;
    that = const_cast<QScriptValueIteratorPrivate*>(d);
    if (found) {
        that->forward = true;
        that->nextIndex = i;
        return true;
    } else {
        that->nextIndex = -1;
        return false;
    }
}

void QScriptValueImpl::setProperty(QScriptNameIdImpl *nameId,
                                   const QScriptValueImpl &value,
                                   const QScriptValue::PropertyFlags &flags)
{
    if (!isObject())
        return;

    QScriptValueImpl base;
    QScript::Member member;

    QScriptValue::ResolveFlags mode = QScriptValue::ResolveLocal;
    // if we are not setting a setter or getter, look in prototype too
    if (!(flags & (QScriptValue::PropertyGetter | QScriptValue::PropertySetter)))
        mode |= QScriptValue::ResolvePrototype;

    if (resolve(nameId, &member, &base, mode, QScript::ReadWrite)) {
        // we resolved an existing property with that name
        if (flags & (QScriptValue::PropertyGetter | QScriptValue::PropertySetter)) {
            // setting the getter or setter of a property in this object
            if (member.isNativeProperty()) {
                if (value.isValid()) {
                    qWarning("QScriptValue::setProperty() failed: "
                             "cannot set getter or setter of native property `%s'",
                             qPrintable(nameId->s));
                }
                return;
            }
            if (member.isSetter()) {
                // the property we resolved is a setter
                if (!(flags & QScriptValue::PropertySetter) && !member.isGetter()) {
                    // find the getter, if not, create one
                    if (!m_object_value->findGetter(&member)) {
                        if (!value.isValid())
                            return; // don't create property for invalid value
                        createMember(nameId, &member, flags);
                    }
                }
            } else if (member.isGetter()) {
                // the property we resolved is a getter
                if (!(flags & QScriptValue::PropertyGetter)) {
                    // find the setter, if not, create one
                    if (!m_object_value->findSetter(&member)) {
                        if (!value.isValid())
                            return; // don't create property for invalid value
                        createMember(nameId, &member, flags);
                    }
                }
            } else {
                // the property is a normal property -- change the flags
                uint newFlags = flags & ~QScript::Member::InternalRange;
                newFlags |= QScript::Member::ObjectProperty;
                member.resetFlags(newFlags);
                base.m_object_value->m_members[member.id()].resetFlags(newFlags);
            }
            Q_ASSERT(member.isValid());
            if (!value.isValid()) {
                // remove the property
                removeMember(member);
                return;
            }
        } else {
            // setting the value
            if (member.isGetterOrSetter()) {
                // call the setter
                QScriptValueImpl setter;
                if (member.isObjectProperty() && !member.isSetter()) {
                    if (!base.m_object_value->findSetter(&member)) {
                        qWarning("QScriptValue::setProperty() failed: "
                                 "property '%s' has a getter but no setter",
                                 qPrintable(nameId->s));
                        return;
                    }
                }
                base.get(member, &setter);
                setter.call(*this, QScriptValueImplList() << value);
                return;
            } else {
                if (base.m_object_value != m_object_value) {
                    if (!value.isValid())
                        return; // don't create property for invalid value
                    createMember(nameId, &member, flags);
                    base = *this;
                } else {
                    if (!value.isValid()) {
                        // remove the property
                        removeMember(member);
                        return;
                    }
                }
                if (flags != QScriptValue::KeepExistingFlags) {
                    // change flags
                    if (member.isNativeProperty()) {
                        qWarning("QScriptValue::setProperty(%s): "
                                 "cannot change flags of a native property",
                                 qPrintable(nameId->s));
                    } else {
                        uint newFlags = member.flags() & QScript::Member::InternalRange;
                        newFlags |= flags & ~QScript::Member::InternalRange;
                        base.m_object_value->m_members[member.id()].resetFlags(newFlags);
                    }
//.........这里部分代码省略.........