/*!
    If \a script is a simple enumeration expression (eg. Text.AlignLeft),
    returns the integer equivalent (eg. 1), and sets \a ok to true.

    Otherwise sets \a ok to false.

    A valid \a ok must be provided, or the function will assert.
*/
int QQmlCustomParser::evaluateEnum(const QByteArray& script, bool *ok) const
{
    Q_ASSERT_X(ok, "QQmlCustomParser::evaluateEnum", "ok must not be a null pointer");
    *ok = false;
    int dot = script.indexOf('.');
    if (dot == -1)
        return -1;


    QString scope = QString::fromUtf8(script.left(dot));
    QByteArray enumValue = script.mid(dot+1);

    if (scope != QLatin1String("Qt")) {
        if (imports.isNull())
            return -1;
        QQmlType *type = 0;

        if (imports.isT1()) {
            imports.asT1()->resolveType(scope, &type, 0, 0, 0);
        } else {
            QQmlTypeNameCache::Result result = imports.asT2()->query(scope);
            if (result.isValid())
                type = result.type;
        }

        return type ? type->enumValue(QHashedCStringRef(enumValue.constData(), enumValue.length()), ok) : -1;
    }

    const QMetaObject *mo = StaticQtMetaObject::get();
    int i = mo->enumeratorCount();
    while (i--) {
        int v = mo->enumerator(i).keyToValue(enumValue.constData(), ok);
        if (*ok)
            return v;
    }
    return -1;
}
示例#2
0
ReturnedValue QmlTypeWrapper::get(Managed *m, String *name, bool *hasProperty)
{
    Q_ASSERT(m->as<QmlTypeWrapper>());

    QV4::ExecutionEngine *v4 = static_cast<QmlTypeWrapper *>(m)->engine();
    QV4::Scope scope(v4);

    Scoped<QmlTypeWrapper> w(scope, static_cast<QmlTypeWrapper *>(m));

    if (hasProperty)
        *hasProperty = true;

    QQmlContextData *context = v4->v8Engine->callingContext();

    QObject *object = w->d()->object;

    if (w->d()->type) {
        QQmlType *type = w->d()->type;

        // singleton types are handled differently to other types.
        if (type->isSingleton()) {
            QQmlEngine *e = v4->qmlEngine();
            QQmlType::SingletonInstanceInfo *siinfo = type->singletonInstanceInfo();
            siinfo->init(e);

            QObject *qobjectSingleton = siinfo->qobjectApi(e);
            if (qobjectSingleton) {
                // check for enum value
                if (name->startsWithUpper()) {
                    if (w->d()->mode == Heap::QmlTypeWrapper::IncludeEnums) {
                        // ### Optimize
                        QByteArray enumName = name->toQString().toUtf8();
                        const QMetaObject *metaObject = qobjectSingleton->metaObject();
                        for (int ii = metaObject->enumeratorCount() - 1; ii >= 0; --ii) {
                            QMetaEnum e = metaObject->enumerator(ii);
                            bool ok;
                            int value = e.keyToValue(enumName.constData(), &ok);
                            if (ok)
                                return QV4::Primitive::fromInt32(value).asReturnedValue();
                        }
                    }
                }

                // check for property.
                return QV4::QObjectWrapper::getQmlProperty(v4, context, qobjectSingleton, name, QV4::QObjectWrapper::IgnoreRevision, hasProperty);
            } else if (!siinfo->scriptApi(e).isUndefined()) {
                // NOTE: if used in a binding, changes will not trigger re-evaluation since non-NOTIFYable.
                QV4::ScopedObject o(scope, QJSValuePrivate::convertedToValue(v4, siinfo->scriptApi(e)));
                if (!!o)
                    return o->get(name);
            }

            // Fall through to base implementation

        } else {

            if (name->startsWithUpper()) {
                bool ok = false;
                int value = type->enumValue(name, &ok);
                if (ok)
                    return QV4::Primitive::fromInt32(value).asReturnedValue();

                // Fall through to base implementation

            } else if (w->d()->object) {
                QObject *ao = qmlAttachedPropertiesObjectById(type->attachedPropertiesId(), object);
                if (ao)
                    return QV4::QObjectWrapper::getQmlProperty(v4, context, ao, name, QV4::QObjectWrapper::IgnoreRevision, hasProperty);

                // Fall through to base implementation
            }

            // Fall through to base implementation
        }

        // Fall through to base implementation

    } else if (w->d()->typeNamespace) {
        Q_ASSERT(w->d()->importNamespace);
        QQmlTypeNameCache::Result r = w->d()->typeNamespace->query(name, w->d()->importNamespace);

        if (r.isValid()) {
            if (r.type) {
                return create(scope.engine, object, r.type, w->d()->mode);
            } else if (r.scriptIndex != -1) {
                QV4::ScopedObject scripts(scope, context->importedScripts.valueRef());
                return scripts->getIndexed(r.scriptIndex);
            } else if (r.importNamespace) {
                return create(scope.engine, object, context->imports, r.importNamespace);
            }

            return QV4::Encode::undefined();

        }

        // Fall through to base implementation

    } else {
        Q_ASSERT(!"Unreachable");
    }

    if (hasProperty)
        *hasProperty = false;
    return Object::get(m, name, hasProperty);
}
v8::Handle<v8::Value> QV8ContextWrapper::Getter(v8::Local<v8::String> property, 
                                                const v8::AccessorInfo &info)
{
    QV8ContextResource *resource = v8_resource_check<QV8ContextResource>(info.This());

    // Its possible we could delay the calculation of the "actual" context (in the case
    // of sub contexts) until it is definately needed.
    QQmlContextData *context = resource->getContext();
    QQmlContextData *expressionContext = context;

    if (!context)
        return v8::Undefined();

    if (v8::Context::GetCallingQmlGlobal() != info.This())
        return v8::Handle<v8::Value>();

    // Search type (attached property/enum/imported scripts) names
    // while (context) {
    //     Search context properties
    //     Search scope object
    //     Search context object
    //     context = context->parent
    // }

    QV8Engine *engine = resource->engine;

    QObject *scopeObject = resource->getScopeObject();

    QHashedV8String propertystring(property);

    if (context->imports && QV8Engine::startsWithUpper(property)) {
        // Search for attached properties, enums and imported scripts
        QQmlTypeNameCache::Result r = context->imports->query(propertystring);
        
        if (r.isValid()) { 
            if (r.scriptIndex != -1) {
                int index = r.scriptIndex;
                if (index < context->importedScripts.count())
                    return context->importedScripts.at(index);
                else
                    return v8::Undefined();
            } else if (r.type) {
                return engine->typeWrapper()->newObject(scopeObject, r.type);
            } else if (r.importNamespace) {
                return engine->typeWrapper()->newObject(scopeObject, context->imports, r.importNamespace);
            }
            Q_ASSERT(!"Unreachable");
        }

        // Fall through
    }

    QQmlEnginePrivate *ep = QQmlEnginePrivate::get(engine->engine());
    QV8QObjectWrapper *qobjectWrapper = engine->qobjectWrapper();

    while (context) {
        // Search context properties
        if (context->propertyNames) {
            int propertyIdx = context->propertyNames->value(propertystring);

            if (propertyIdx != -1) {

                if (propertyIdx < context->idValueCount) {

                    ep->captureProperty(&context->idValues[propertyIdx].bindings);
                    return engine->newQObject(context->idValues[propertyIdx]);
                } else {

                    QQmlContextPrivate *cp = context->asQQmlContextPrivate();

                    ep->captureProperty(context->asQQmlContext(), -1,
                                        propertyIdx + cp->notifyIndex);

                    const QVariant &value = cp->propertyValues.at(propertyIdx);
                    if (value.userType() == qMetaTypeId<QList<QObject*> >()) {
                        QQmlListProperty<QObject> prop(context->asQQmlContext(), (void*) qintptr(propertyIdx),
                                                               QQmlContextPrivate::context_count,
                                                               QQmlContextPrivate::context_at);
                        return engine->listWrapper()->newList(prop, qMetaTypeId<QQmlListProperty<QObject> >());
                    } else {
                        return engine->fromVariant(cp->propertyValues.at(propertyIdx));
                    }
                }
            }
        }

        // Search scope object
        if (scopeObject) {
            v8::Handle<v8::Value> result = qobjectWrapper->getProperty(scopeObject, propertystring,
                                                                       context, QV8QObjectWrapper::CheckRevision);
            if (!result.IsEmpty()) return result;
        }
        scopeObject = 0;


        // Search context object
        if (context->contextObject) {
            v8::Handle<v8::Value> result = qobjectWrapper->getProperty(context->contextObject, propertystring,
                                                                       context, QV8QObjectWrapper::CheckRevision);
            if (!result.IsEmpty()) return result;
        }

        context = context->parent;
    }

    expressionContext->unresolvedNames = true;

    // V8 will throw a ReferenceError if appropriate ("typeof" should not throw)
    return v8::Handle<v8::Value>();
}
ReturnedValue QmlContextWrapper::get(const Managed *m, String *name, bool *hasProperty)
{
    Q_ASSERT(m->as<QmlContextWrapper>());
    const QmlContextWrapper *resource = static_cast<const QmlContextWrapper *>(m);
    QV4::ExecutionEngine *v4 = resource->engine();
    QV4::Scope scope(v4);

    // In V8 the JS global object would come _before_ the QML global object,
    // so simulate that here.
    bool hasProp;
    QV4::ScopedValue result(scope, v4->globalObject->get(name, &hasProp));
    if (hasProp) {
        if (hasProperty)
            *hasProperty = hasProp;
        return result->asReturnedValue();
    }

    if (resource->d()->isNullWrapper)
        return Object::get(m, name, hasProperty);

    if (v4->callingQmlContext() != resource->d()->context)
        return Object::get(m, name, hasProperty);

    result = Object::get(m, name, &hasProp);
    if (hasProp) {
        if (hasProperty)
            *hasProperty = hasProp;
        return result->asReturnedValue();
    }

    // Its possible we could delay the calculation of the "actual" context (in the case
    // of sub contexts) until it is definately needed.
    QQmlContextData *context = resource->getContext();
    QQmlContextData *expressionContext = context;

    if (!context) {
        if (hasProperty)
            *hasProperty = true;
        return result->asReturnedValue();
    }

    // Search type (attached property/enum/imported scripts) names
    // while (context) {
    //     Search context properties
    //     Search scope object
    //     Search context object
    //     context = context->parent
    // }

    QObject *scopeObject = resource->getScopeObject();

    if (context->imports && name->startsWithUpper()) {
        // Search for attached properties, enums and imported scripts
        QQmlTypeNameCache::Result r = context->imports->query(name);

        if (r.isValid()) {
            if (hasProperty)
                *hasProperty = true;
            if (r.scriptIndex != -1) {
                QV4::ScopedObject scripts(scope, context->importedScripts.valueRef());
                return scripts->getIndexed(r.scriptIndex);
            } else if (r.type) {
                return QmlTypeWrapper::create(v4, scopeObject, r.type);
            } else if (r.importNamespace) {
                return QmlTypeWrapper::create(v4, scopeObject, context->imports, r.importNamespace);
            }
            Q_ASSERT(!"Unreachable");
        }

        // Fall through
    }

    QQmlEnginePrivate *ep = QQmlEnginePrivate::get(v4->qmlEngine());

    while (context) {
        // Search context properties
        const QV4::IdentifierHash<int> &properties = context->propertyNames();
        if (properties.count()) {
            int propertyIdx = properties.value(name);

            if (propertyIdx != -1) {

                if (propertyIdx < context->idValueCount) {

                    if (ep->propertyCapture)
                        ep->propertyCapture->captureProperty(&context->idValues[propertyIdx].bindings);
                    if (hasProperty)
                        *hasProperty = true;
                    return QV4::QObjectWrapper::wrap(v4, context->idValues[propertyIdx]);
                } else {

                    QQmlContextPrivate *cp = context->asQQmlContextPrivate();

                    if (ep->propertyCapture)
                        ep->propertyCapture->captureProperty(context->asQQmlContext(), -1, propertyIdx + cp->notifyIndex);

                    const QVariant &value = cp->propertyValues.at(propertyIdx);
                    if (hasProperty)
                        *hasProperty = true;
                    if (value.userType() == qMetaTypeId<QList<QObject*> >()) {
                        QQmlListProperty<QObject> prop(context->asQQmlContext(), (void*) qintptr(propertyIdx),
                                                               QQmlContextPrivate::context_count,
                                                               QQmlContextPrivate::context_at);
                        return QmlListWrapper::create(v4, prop, qMetaTypeId<QQmlListProperty<QObject> >());
                    } else {
                        return scope.engine->fromVariant(cp->propertyValues.at(propertyIdx));
                    }
                }
            }
        }

        // Search scope object
        if (scopeObject) {
            bool hasProp = false;
            QV4::ScopedValue result(scope, QV4::QObjectWrapper::getQmlProperty(v4, context, scopeObject,
                                                                               name, QV4::QObjectWrapper::CheckRevision, &hasProp));
            if (hasProp) {
                if (hasProperty)
                    *hasProperty = true;
                return result->asReturnedValue();
            }
        }
        scopeObject = 0;


        // Search context object
        if (context->contextObject) {
            bool hasProp = false;
            result = QV4::QObjectWrapper::getQmlProperty(v4, context, context->contextObject, name, QV4::QObjectWrapper::CheckRevision, &hasProp);
            if (hasProp) {
                if (hasProperty)
                    *hasProperty = true;
                return result->asReturnedValue();
            }
        }

        context = context->parent;
    }

    expressionContext->unresolvedNames = true;

    return Encode::undefined();
}