qmljsinterpreter.cpp

/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (info@qt.nokia.com)
**
**
** GNU Lesser General Public License Usage
**
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** Other Usage
**
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
** If you have questions regarding the use of this file, please contact
** Nokia at info@qt.nokia.com.
**
**************************************************************************/

#include "qmljsinterpreter.h"
#include "qmljsevaluate.h"
#include "qmljslink.h"
#include "qmljsbind.h"
#include "qmljsscopebuilder.h"
#include "qmljstypedescriptionreader.h"
#include "qmljsscopeastpath.h"
#include "parser/qmljsast_p.h"

#include <languageutils/fakemetaobject.h>

#include <QtCore/QFile>
#include <QtCore/QDir>
#include <QtCore/QString>
#include <QtCore/QStringList>
#include <QtCore/QMetaObject>
#include <QtCore/QMetaProperty>
#include <QtCore/QXmlStreamReader>
#include <QtCore/QProcess>
#include <QtCore/QDebug>

using namespace LanguageUtils;
using namespace QmlJS::Interpreter;
using namespace QmlJS::AST;

namespace {

class LookupMember: public MemberProcessor
{
    QString _name;
    const Value *_value;

    bool process(const QString &name, const Value *value)
    {
        if (_value)
            return false;

        if (name == _name) {
            _value = value;
            return false;
        }

        return true;
    }

public:
    LookupMember(const QString &name)
        : _name(name), _value(0) {}

    const Value *value() const { return _value; }

    virtual bool processProperty(const QString &name, const Value *value)
    {
        return process(name, value);
    }

    virtual bool processEnumerator(const QString &name, const Value *value)
    {
        return process(name, value);
    }

    virtual bool processSignal(const QString &name, const Value *value)
    {
        return process(name, value);
    }

    virtual bool processSlot(const QString &name, const Value *value)
    {
        return process(name, value);
    }

    virtual bool processGeneratedSlot(const QString &name, const Value *value)
    {
        return process(name, value);
    }
};

class MetaFunction: public FunctionValue
{
    FakeMetaMethod _method;

public:
    MetaFunction(const FakeMetaMethod &method, Engine *engine)
        : FunctionValue(engine), _method(method)
    {
    }

    virtual const Value *returnValue() const
    {
        return engine()->undefinedValue();
    }

    virtual int argumentCount() const
    {
        return _method.parameterNames().size();
    }

    virtual const Value *argument(int) const
    {
        return engine()->undefinedValue();
    }

    virtual QString argumentName(int index) const
    {
        if (index < _method.parameterNames().size())
            return _method.parameterNames().at(index);

        return FunctionValue::argumentName(index);
    }

    virtual bool isVariadic() const
    {
        return false;
    }

    virtual const Value *invoke(const Activation *) const
    {
        return engine()->undefinedValue();
    }
};

} // end of anonymous namespace

QmlObjectValue::QmlObjectValue(FakeMetaObject::ConstPtr metaObject, const QString &className,
                               const QString &packageName, const ComponentVersion version, Engine *engine)
    : ObjectValue(engine),
      _attachedType(0),
      _metaObject(metaObject),
      _packageName(packageName),
      _componentVersion(version)
{
    setClassName(className);
}

QmlObjectValue::~QmlObjectValue()
{}

const Value *QmlObjectValue::findOrCreateSignature(int index, const FakeMetaMethod &method, QString *methodName) const
{
    *methodName = method.methodName();
    const Value *value = _metaSignature.value(index);
    if (! value) {
        value = new MetaFunction(method, engine());
        _metaSignature.insert(index, value);
    }
    return value;
}

void QmlObjectValue::processMembers(MemberProcessor *processor) const
{
    // process the meta enums
    for (int index = _metaObject->enumeratorOffset(); index < _metaObject->enumeratorCount(); ++index) {
        FakeMetaEnum e = _metaObject->enumerator(index);

        for (int i = 0; i < e.keyCount(); ++i) {
            processor->processEnumerator(e.key(i), engine()->numberValue());
        }
    }

    // all explicitly defined signal names
    QSet<QString> explicitSignals;

    // process the meta methods
    for (int index = 0; index < _metaObject->methodCount(); ++index) {
        FakeMetaMethod method = _metaObject->method(index);
        QString methodName;
        const Value *signature = findOrCreateSignature(index, method, &methodName);

        if (method.methodType() == FakeMetaMethod::Slot && method.access() == FakeMetaMethod::Public) {
            processor->processSlot(methodName, signature);

        } else if (method.methodType() == FakeMetaMethod::Signal && method.access() != FakeMetaMethod::Private) {
            // process the signal
            processor->processSignal(methodName, signature);
            explicitSignals.insert(methodName);

            QString slotName = QLatin1String("on");
            slotName += methodName.at(0).toUpper();
            slotName += methodName.midRef(1);

            // process the generated slot
            processor->processGeneratedSlot(slotName, signature);
        }
    }

    // process the meta properties
    for (int index = 0; index < _metaObject->propertyCount(); ++index) {
        FakeMetaProperty prop = _metaObject->property(index);

        const QString propertyName = prop.name();
        processor->processProperty(propertyName, propertyValue(prop));

        // every property always has a onXyzChanged slot, even if the NOTIFY
        // signal has a different name
        QString signalName = propertyName;
        signalName += QLatin1String("Changed");
        if (!explicitSignals.contains(signalName)) {
            QString slotName = QLatin1String("on");
            slotName += signalName.at(0).toUpper();
            slotName += signalName.midRef(1);

            // process the generated slot
            processor->processGeneratedSlot(slotName, engine()->undefinedValue());
        }
    }

    if (_attachedType)
        _attachedType->processMembers(processor);

    ObjectValue::processMembers(processor);
}

const Value *QmlObjectValue::propertyValue(const FakeMetaProperty &prop) const
{
    QString typeName = prop.typeName();

    // ### Verify type resolving.
    QmlObjectValue *objectValue = engine()->cppQmlTypes().typeByCppName(typeName);
    if (objectValue) {
        FakeMetaObject::Export exp = objectValue->metaObject()->exportInPackage(packageName());
        if (exp.isValid())
            objectValue = engine()->cppQmlTypes().typeByQualifiedName(exp.packageNameVersion);
        return objectValue;
    }

    const Value *value = engine()->undefinedValue();
    if (typeName == QLatin1String("QByteArray")
            || typeName == QLatin1String("string")
            || typeName == QLatin1String("QString")) {
        value = engine()->stringValue();
    } else if (typeName == QLatin1String("QUrl")) {
        value = engine()->urlValue();
    } else if (typeName == QLatin1String("bool")) {
        value = engine()->booleanValue();
    } else if (typeName == QLatin1String("int")
               || typeName == QLatin1String("long")) {
        value = engine()->intValue();
    }  else if (typeName == QLatin1String("float")
                || typeName == QLatin1String("double")
                || typeName == QLatin1String("qreal")) {
        // ### Review: more types here?
        value = engine()->realValue();
    } else if (typeName == QLatin1String("QFont")) {
        value = engine()->qmlFontObject();
    } else if (typeName == QLatin1String("QPoint")
            || typeName == QLatin1String("QPointF")
            || typeName == QLatin1String("QVector2D")) {
        value = engine()->qmlPointObject();
    } else if (typeName == QLatin1String("QSize")
            || typeName == QLatin1String("QSizeF")) {
        value = engine()->qmlSizeObject();
    } else if (typeName == QLatin1String("QRect")
            || typeName == QLatin1String("QRectF")) {
        value = engine()->qmlRectObject();
    } else if (typeName == QLatin1String("QVector3D")) {
        value = engine()->qmlVector3DObject();
    } else if (typeName == QLatin1String("QColor")) {
        value = engine()->colorValue();
    } else if (typeName == QLatin1String("QDeclarativeAnchorLine")) {
        value = engine()->anchorLineValue();
    }

    // might be an enum
    const QmlObjectValue *base = this;
    const QStringList components = typeName.split(QLatin1String("::"));
    if (components.size() == 2) {
        base = engine()->cppQmlTypes().typeByCppName(components.first());
        typeName = components.last();
    }
    if (base) {
        const FakeMetaEnum &metaEnum = base->getEnum(typeName);
        if (metaEnum.isValid())
            value = new QmlEnumValue(metaEnum, engine());
    }

    return value;
}

const QmlObjectValue *QmlObjectValue::prototype() const
{
    Q_ASSERT(!_prototype || dynamic_cast<const QmlObjectValue *>(_prototype));
    return static_cast<const QmlObjectValue *>(_prototype);
}

const QmlObjectValue *QmlObjectValue::attachedType() const
{
    return _attachedType;
}

void QmlObjectValue::setAttachedType(QmlObjectValue *value)
{
    _attachedType = value;
}

FakeMetaObject::ConstPtr QmlObjectValue::metaObject() const
{
    return _metaObject;
}

QString QmlObjectValue::packageName() const
{ return _packageName; }

ComponentVersion QmlObjectValue::version() const
{ return _componentVersion; }

QString QmlObjectValue::defaultPropertyName() const
{ return _metaObject->defaultPropertyName(); }

QString QmlObjectValue::propertyType(const QString &propertyName) const
{
    for (const QmlObjectValue *it = this; it; it = it->prototype()) {
        FakeMetaObject::ConstPtr iter = it->_metaObject;
        int propIdx = iter->propertyIndex(propertyName);
        if (propIdx != -1) {
            return iter->property(propIdx).typeName();
        }
    }
    return QString();
}

bool QmlObjectValue::isListProperty(const QString &propertyName) const
{
    for (const QmlObjectValue *it = this; it; it = it->prototype()) {
        FakeMetaObject::ConstPtr iter = it->_metaObject;
        int propIdx = iter->propertyIndex(propertyName);
        if (propIdx != -1) {
            return iter->property(propIdx).isList();
        }
    }
    return false;
}

bool QmlObjectValue::isEnum(const QString &typeName) const
{
    return _metaObject->enumeratorIndex(typeName) != -1;
}

FakeMetaEnum QmlObjectValue::getEnum(const QString &typeName) const
{
    const int index = _metaObject->enumeratorIndex(typeName);
    if (index == -1)
        return FakeMetaEnum();

    return _metaObject->enumerator(index);
}

bool QmlObjectValue::isWritable(const QString &propertyName) const
{
    for (const QmlObjectValue *it = this; it; it = it->prototype()) {
        FakeMetaObject::ConstPtr iter = it->_metaObject;
        int propIdx = iter->propertyIndex(propertyName);
        if (propIdx != -1) {
            return iter->property(propIdx).isWritable();
        }
    }
    return false;
}

bool QmlObjectValue::isPointer(const QString &propertyName) const
{
    for (const QmlObjectValue *it = this; it; it = it->prototype()) {
        FakeMetaObject::ConstPtr iter = it->_metaObject;
        int propIdx = iter->propertyIndex(propertyName);
        if (propIdx != -1) {
            return iter->property(propIdx).isPointer();
        }
    }
    return false;
}

bool QmlObjectValue::hasLocalProperty(const QString &typeName) const
{
    int idx = _metaObject->propertyIndex(typeName);
    if (idx == -1)
        return false;
    return true;
}

bool QmlObjectValue::hasProperty(const QString &propertyName) const
{
    for (const QmlObjectValue *it = this; it; it = it->prototype()) {
        FakeMetaObject::ConstPtr iter = it->_metaObject;
        int propIdx = iter->propertyIndex(propertyName);
        if (propIdx != -1) {
            return true;
        }
    }
    return false;
}

bool QmlObjectValue::enumContainsKey(const QString &enumName, const QString &enumKeyName) const
{
    int idx = _metaObject->enumeratorIndex(enumName);
    if (idx == -1)
        return false;
    const FakeMetaEnum &fme = _metaObject->enumerator(idx);
    for (int i = 0; i < fme.keyCount(); ++i) {
        if (fme.key(i) == enumKeyName)
            return true;
    }
    return false;
}

QStringList QmlObjectValue::keysForEnum(const QString &enumName) const
{
    int idx = _metaObject->enumeratorIndex(enumName);
    if (idx == -1)
        return QStringList();
    const FakeMetaEnum &fme = _metaObject->enumerator(idx);
    return fme.keys();
}

// Returns true if this object is in a package or if there is an object that
// has this one in its prototype chain and is itself in a package.
bool QmlObjectValue::hasChildInPackage() const
{
    if (!packageName().isEmpty())
        return true;
    QHashIterator<QString, QmlObjectValue *> it(engine()->cppQmlTypes().types());
    while (it.hasNext()) {
        it.next();
        FakeMetaObject::ConstPtr other = it.value()->_metaObject;
        // if it has only the default no-package export, it is not really exported
        if (other->exports().size() <= 1)
            continue;
        for (const QmlObjectValue *it = this; it; it = it->prototype()) {
            FakeMetaObject::ConstPtr iter = it->_metaObject;
            if (iter == _metaObject) // this object is a parent of other
                return true;
        }
    }
    return false;
}

bool QmlObjectValue::isDerivedFrom(FakeMetaObject::ConstPtr base) const
{
    for (const QmlObjectValue *it = this; it; it = it->prototype()) {
        FakeMetaObject::ConstPtr iter = it->_metaObject;
        if (iter == base)
            return true;
    }
    return false;
}

QmlEnumValue::QmlEnumValue(const FakeMetaEnum &metaEnum, Engine *engine)
    : NumberValue(),
      _metaEnum(new FakeMetaEnum(metaEnum))
{
    engine->registerValue(this);
}

QmlEnumValue::~QmlEnumValue()
{
    delete _metaEnum;
}

QString QmlEnumValue::name() const
{
    return _metaEnum->name();
}

QStringList QmlEnumValue::keys() const
{
    return _metaEnum->keys();
}

namespace {

////////////////////////////////////////////////////////////////////////////////
// constructors
////////////////////////////////////////////////////////////////////////////////
class ObjectCtor: public Function
{
public:
    ObjectCtor(Engine *engine);

    virtual const Value *invoke(const Activation *activation) const;
};

class FunctionCtor: public Function
{
public:
    FunctionCtor(Engine *engine);

    virtual const Value *invoke(const Activation *activation) const;
};

class ArrayCtor: public Function
{
public:
    ArrayCtor(Engine *engine);

    virtual const Value *invoke(const Activation *activation) const;
};

class StringCtor: public Function
{
public:
    StringCtor(Engine *engine);

    virtual const Value *invoke(const Activation *activation) const;
};

class BooleanCtor: public Function
{
public:
    BooleanCtor(Engine *engine);

    virtual const Value *invoke(const Activation *activation) const;
};

class NumberCtor: public Function
{
public:
    NumberCtor(Engine *engine);

    virtual const Value *invoke(const Activation *activation) const;
};

class DateCtor: public Function
{
public:
    DateCtor(Engine *engine);

    virtual const Value *invoke(const Activation *activation) const;
};

class RegExpCtor: public Function
{
public:
    RegExpCtor(Engine *engine);

    virtual const Value *invoke(const Activation *activation) const;
};

ObjectCtor::ObjectCtor(Engine *engine)
    : Function(engine)
{
}

FunctionCtor::FunctionCtor(Engine *engine)
    : Function(engine)
{
}

ArrayCtor::ArrayCtor(Engine *engine)
    : Function(engine)
{
}

StringCtor::StringCtor(Engine *engine)
    : Function(engine)
{
}

BooleanCtor::BooleanCtor(Engine *engine)
    : Function(engine)
{
}

NumberCtor::NumberCtor(Engine *engine)
    : Function(engine)
{
}

DateCtor::DateCtor(Engine *engine)
    : Function(engine)
{
}

RegExpCtor::RegExpCtor(Engine *engine)
    : Function(engine)
{
}

const Value *ObjectCtor::invoke(const Activation *activation) const
{
    ObjectValue *thisObject = activation->thisObject();
    if (activation->calledAsFunction())
        thisObject = engine()->newObject();

    thisObject->setClassName("Object");
    thisObject->setPrototype(engine()->objectPrototype());
    thisObject->setMember("length", engine()->numberValue());
    return thisObject;
}

const Value *FunctionCtor::invoke(const Activation *activation) const
{
    ObjectValue *thisObject = activation->thisObject();
    if (activation->calledAsFunction())
        thisObject = engine()->newObject();

    thisObject->setClassName("Function");
    thisObject->setPrototype(engine()->functionPrototype());
    thisObject->setMember("length", engine()->numberValue());
    return thisObject;
}

const Value *ArrayCtor::invoke(const Activation *activation) const
{
    ObjectValue *thisObject = activation->thisObject();
    if (activation->calledAsFunction())
        thisObject = engine()->newObject();

    thisObject->setClassName("Array");
    thisObject->setPrototype(engine()->arrayPrototype());
    thisObject->setMember("length", engine()->numberValue());
    return thisObject;
}

const Value *StringCtor::invoke(const Activation *activation) const
{
    if (activation->calledAsFunction())
        return engine()->convertToString(activation->thisObject());

    ObjectValue *thisObject = activation->thisObject();
    thisObject->setClassName("String");
    thisObject->setPrototype(engine()->stringPrototype());
    thisObject->setMember("length", engine()->numberValue());
    return thisObject;
}

const Value *BooleanCtor::invoke(const Activation *activation) const
{
    if (activation->calledAsFunction())
        return engine()->convertToBoolean(activation->thisObject());

    ObjectValue *thisObject = activation->thisObject();
    thisObject->setClassName("Boolean");
    thisObject->setPrototype(engine()->booleanPrototype());
    return thisObject;
}

const Value *NumberCtor::invoke(const Activation *activation) const
{
    if (activation->calledAsFunction())
        return engine()->convertToNumber(activation->thisObject());

    ObjectValue *thisObject = activation->thisObject();
    thisObject->setClassName("Number");
    thisObject->setPrototype(engine()->numberPrototype());
    return thisObject;
}

const Value *DateCtor::invoke(const Activation *activation) const
{
    if (activation->calledAsFunction())
        return engine()->stringValue();

    ObjectValue *thisObject = activation->thisObject();
    thisObject->setClassName("Date");
    thisObject->setPrototype(engine()->datePrototype());
    return thisObject;
}

const Value *RegExpCtor::invoke(const Activation *activation) const
{
    ObjectValue *thisObject = activation->thisObject();
    if (activation->calledAsFunction())
        thisObject = engine()->newObject();

    thisObject->setClassName("RegExp");
    thisObject->setPrototype(engine()->regexpPrototype());
    thisObject->setMember("source", engine()->stringValue());
    thisObject->setMember("global", engine()->booleanValue());
    thisObject->setMember("ignoreCase", engine()->booleanValue());
    thisObject->setMember("multiline", engine()->booleanValue());
    thisObject->setMember("lastIndex", engine()->numberValue());
    return thisObject;
}

} // end of anonymous namespace

////////////////////////////////////////////////////////////////////////////////
// ValueVisitor
////////////////////////////////////////////////////////////////////////////////
ValueVisitor::ValueVisitor()
{
}

ValueVisitor::~ValueVisitor()
{
}

void ValueVisitor::visit(const NullValue *)
{
}

void ValueVisitor::visit(const UndefinedValue *)
{
}

void ValueVisitor::visit(const NumberValue *)
{
}

void ValueVisitor::visit(const BooleanValue *)
{
}

void ValueVisitor::visit(const StringValue *)
{
}

void ValueVisitor::visit(const ObjectValue *)
{
}

void ValueVisitor::visit(const FunctionValue *)
{
}

void ValueVisitor::visit(const Reference *)
{
}

void ValueVisitor::visit(const ColorValue *)
{
}

void ValueVisitor::visit(const AnchorLineValue *)
{
}

////////////////////////////////////////////////////////////////////////////////
// Value
////////////////////////////////////////////////////////////////////////////////
Value::Value()
{
}

Value::~Value()
{
}

bool Value::getSourceLocation(QString *, int *, int *) const
{
    return false;
}

const NullValue *Value::asNullValue() const
{
    return 0;
}

const UndefinedValue *Value::asUndefinedValue() const
{
    return 0;
}

const NumberValue *Value::asNumberValue() const
{
    return 0;
}

const IntValue *Value::asIntValue() const
{
    return 0;
}

const RealValue *Value::asRealValue() const
{
    return 0;
}

const BooleanValue *Value::asBooleanValue() const
{
    return 0;
}

const StringValue *Value::asStringValue() const
{
    return 0;
}

const UrlValue *Value::asUrlValue() const
{
    return 0;
}

const ObjectValue *Value::asObjectValue() const
{
    return 0;
}

const FunctionValue *Value::asFunctionValue() const
{
    return 0;
}

const Reference *Value::asReference() const
{
    return 0;
}

const ColorValue *Value::asColorValue() const
{
    return 0;
}

const AnchorLineValue *Value::asAnchorLineValue() const
{
    return 0;
}

////////////////////////////////////////////////////////////////////////////////
// Values
////////////////////////////////////////////////////////////////////////////////
const NullValue *NullValue::asNullValue() const
{
    return this;
}

void NullValue::accept(ValueVisitor *visitor) const
{
    visitor->visit(this);
}

const UndefinedValue *UndefinedValue::asUndefinedValue() const
{
    return this;
}

void UndefinedValue::accept(ValueVisitor *visitor) const
{
    visitor->visit(this);
}

const NumberValue *NumberValue::asNumberValue() const
{
    return this;
}

const RealValue *RealValue::asRealValue() const
{
    return this;
}

const IntValue *IntValue::asIntValue() const
{
    return this;
}

void NumberValue::accept(ValueVisitor *visitor) const
{
    visitor->visit(this);
}

const BooleanValue *BooleanValue::asBooleanValue() const
{
    return this;
}

void BooleanValue::accept(ValueVisitor *visitor) const
{
    visitor->visit(this);
}

const StringValue *StringValue::asStringValue() const
{
    return this;
}

const UrlValue *UrlValue::asUrlValue() const
{
    return this;
}

void StringValue::accept(ValueVisitor *visitor) const
{
    visitor->visit(this);
}


ScopeChain::ScopeChain()
    : globalScope(0)
    , qmlTypes(0)
    , jsImports(0)
{
}

ScopeChain::QmlComponentChain::QmlComponentChain()
{
}

ScopeChain::QmlComponentChain::~QmlComponentChain()
{
    qDeleteAll(instantiatingComponents);
}

void ScopeChain::QmlComponentChain::clear()
{
    qDeleteAll(instantiatingComponents);
    instantiatingComponents.clear();
    document = Document::Ptr(0);
}

void ScopeChain::QmlComponentChain::collect(QList<const ObjectValue *> *list) const
{
    foreach (const QmlComponentChain *parent, instantiatingComponents)
        parent->collect(list);

    if (!document)
        return;

    if (ObjectValue *root = document->bind()->rootObjectValue())
        list->append(root);
    if (ObjectValue *ids = document->bind()->idEnvironment())
        list->append(ids);
}

void ScopeChain::update()
{
    _all.clear();

    _all += globalScope;

    // the root scope in js files doesn't see instantiating components
    if (jsScopes.count() != 1 || !qmlScopeObjects.isEmpty()) {
        if (qmlComponentScope) {
            foreach (const QmlComponentChain *parent, qmlComponentScope->instantiatingComponents)
                parent->collect(&_all);
        }
    }

    ObjectValue *root = 0;
    ObjectValue *ids = 0;
    if (qmlComponentScope && qmlComponentScope->document) {
        root = qmlComponentScope->document->bind()->rootObjectValue();
        ids = qmlComponentScope->document->bind()->idEnvironment();
    }

    if (root && !qmlScopeObjects.contains(root))
        _all += root;
    _all += qmlScopeObjects;
    if (ids)
        _all += ids;
    if (qmlTypes)
        _all += qmlTypes;
    if (jsImports)
        _all += jsImports;
    _all += jsScopes;
}

QList<const ObjectValue *> ScopeChain::all() const
{
    return _all;
}


Context::Context(const QmlJS::Snapshot &snapshot)
    : _snapshot(snapshot),
      _engine(new Engine),
      _qmlScopeObjectIndex(-1),
      _qmlScopeObjectSet(false)
{
}

Context::~Context()
{
}

// the engine is only guaranteed to live as long as the context
Engine *Context::engine() const
{
    return _engine.data();
}

QmlJS::Snapshot Context::snapshot() const
{
    return _snapshot;
}

const ScopeChain &Context::scopeChain() const
{
    return _scopeChain;
}

ScopeChain &Context::scopeChain()
{
    return _scopeChain;
}

const Imports *Context::imports(const QmlJS::Document *doc) const
{
    if (!doc)
        return 0;
    return _imports.value(doc).data();
}

void Context::setImports(const QmlJS::Document *doc, const Imports *imports)
{
    if (!doc)
        return;
    _imports[doc] = QSharedPointer<const Imports>(imports);
}

const Value *Context::lookup(const QString &name, const ObjectValue **foundInScope) const
{
    QList<const ObjectValue *> scopes = _scopeChain.all();
    for (int index = scopes.size() - 1; index != -1; --index) {
        const ObjectValue *scope = scopes.at(index);

        if (const Value *member = scope->lookupMember(name, this)) {
            if (foundInScope)
                *foundInScope = scope;
            return member;
        }
    }

    if (foundInScope)
        *foundInScope = 0;
    return _engine->undefinedValue();
}

const ObjectValue *Context::lookupType(const QmlJS::Document *doc, UiQualifiedId *qmlTypeName,
                                       UiQualifiedId *qmlTypeNameEnd) const
{
    const Imports *importsObj = imports(doc);
    if (!importsObj)
        return 0;
    const ObjectValue *objectValue = importsObj->typeScope();
    if (!objectValue)
        return 0;

    for (UiQualifiedId *iter = qmlTypeName; objectValue && iter && iter != qmlTypeNameEnd;
         iter = iter->next) {
        if (! iter->name)
            return 0;

        const Value *value = objectValue->lookupMember(iter->name->asString(), this);
        if (!value)
            return 0;

        objectValue = value->asObjectValue();
    }

    return objectValue;
}

const ObjectValue *Context::lookupType(const QmlJS::Document *doc, const QStringList &qmlTypeName) const
{
    const Imports *importsObj = imports(doc);
    if (!importsObj)
        return 0;
    const ObjectValue *objectValue = importsObj->typeScope();
    if (!objectValue)
        return 0;

    foreach (const QString &name, qmlTypeName) {
        if (!objectValue)
            return 0;

        const Value *value = objectValue->lookupMember(name, this);
        if (!value)
            return 0;

        objectValue = value->asObjectValue();
    }

    return objectValue;
}

const Value *Context::lookupReference(const Value *value) const
{
    const Reference *reference = value_cast<const Reference *>(value);
    if (!reference)
        return value;

    if (_referenceStack.contains(reference))
        return 0;

    _referenceStack.append(reference);
    const Value *v = reference->value(this);
    _referenceStack.removeLast();

    return v;
}

const Value *Context::property(const ObjectValue *object, const QString &name) const
{
    const Properties properties = _properties.value(object);
    return properties.value(name, engine()->undefinedValue());
}

void Context::setProperty(const ObjectValue *object, const QString &name, const Value *value)
{
    _properties[object].insert(name, value);
}

QString Context::defaultPropertyName(const ObjectValue *object) const
{
    PrototypeIterator iter(object, this);
    while (iter.hasNext()) {
        const ObjectValue *o = iter.next();
        if (const ASTObjectValue *astObjValue = dynamic_cast<const ASTObjectValue *>(o)) {
            QString defaultProperty = astObjValue->defaultPropertyName();
            if (!defaultProperty.isEmpty())
                return defaultProperty;
        } else if (const QmlObjectValue *qmlValue = dynamic_cast<const QmlObjectValue *>(o)) {
            return qmlValue->defaultPropertyName();
        }
    }
    return QString();
}

Reference::Reference(Engine *engine)
    : _engine(engine)
{
    _engine->registerValue(this);
}

Reference::~Reference()
{
}

Engine *Reference::engine() const
{
    return _engine;
}

const Reference *Reference::asReference() const
{
    return this;
}

void Reference::accept(ValueVisitor *visitor) const
{
    visitor->visit(this);
}

const Value *Reference::value(const Context *) const
{
    return _engine->undefinedValue();
}

void ColorValue::accept(ValueVisitor *visitor) const
{
    visitor->visit(this);
}

const ColorValue *ColorValue::asColorValue() const
{
    return this;
}

void AnchorLineValue::accept(ValueVisitor *visitor) const
{
    visitor->visit(this);
}

const AnchorLineValue *AnchorLineValue::asAnchorLineValue() const
{
    return this;
}

MemberProcessor::MemberProcessor()
{
}

MemberProcessor::~MemberProcessor()
{
}

bool MemberProcessor::processProperty(const QString &, const Value *)
{
    return true;
}

bool MemberProcessor::processEnumerator(const QString &, const Value *)
{
    return true;
}

bool MemberProcessor::processSignal(const QString &, const Value *)
{
    return true;
}

bool MemberProcessor::processSlot(const QString &,<