qt-everywhere-src-5.14.1/qtscript/src/script/bridge/qscriptdeclarativeobject.cpp

/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL-ONLY$
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** 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
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#include "config.h"
#include "qscriptdeclarativeobject_p.h"

#include "../api/qscriptengine.h"
#include "../api/qscriptengine_p.h"
#include "../api/qscriptcontext.h"
#include "../api/qscriptcontext_p.h"
#include "../api/qscriptclass.h"
#include "../api/qscriptclasspropertyiterator.h"

#include "Error.h"
#include "PropertyNameArray.h"

#include <QtCore/qstringlist.h>

Q_DECLARE_METATYPE(QScriptContext*)
Q_DECLARE_METATYPE(QScriptValue)
Q_DECLARE_METATYPE(QScriptValueList)

QT_BEGIN_NAMESPACE

namespace QScript
{

DeclarativeObjectDelegate::DeclarativeObjectDelegate(QScriptDeclarativeClass *c, 
                                                     QScriptDeclarativeClass::Object *o)
: m_class(c), m_object(o)
{
}

DeclarativeObjectDelegate::~DeclarativeObjectDelegate()
{
    delete m_object;
}

QScriptObjectDelegate::Type DeclarativeObjectDelegate::type() const
{
    return DeclarativeClassObject;
}

bool DeclarativeObjectDelegate::getOwnPropertySlot(QScriptObject* object,
                                                   JSC::ExecState *exec,
                                                   const JSC::Identifier &propertyName,
                                                   JSC::PropertySlot &slot)
{
    QScriptDeclarativeClass::Identifier identifier = (void *)propertyName.ustring().rep();

    QScriptDeclarativeClassPrivate *p = QScriptDeclarativeClassPrivate::get(m_class);
    p->context = reinterpret_cast<QScriptContext *>(exec);
    QScriptClass::QueryFlags flags = 
        m_class->queryProperty(m_object, identifier, QScriptClass::HandlesReadAccess);
    if (flags & QScriptClass::HandlesReadAccess) {
        QScriptDeclarativeClass::Value val = m_class->property(m_object, identifier);
        p->context = 0;
        slot.setValue((const JSC::JSValue &)val);
        return true;
    }
    p->context = 0;

    return QScriptObjectDelegate::getOwnPropertySlot(object, exec, propertyName, slot);
}

void DeclarativeObjectDelegate::put(QScriptObject* object, JSC::ExecState *exec,
                                    const JSC::Identifier &propertyName,
                                    JSC::JSValue value, JSC::PutPropertySlot &slot)
{
    QScriptEnginePrivate *engine = scriptEngineFromExec(exec);
    QScript::SaveFrameHelper saveFrame(engine, exec);
    QScriptDeclarativeClass::Identifier identifier = (void *)propertyName.ustring().rep();

    QScriptDeclarativeClassPrivate *p = QScriptDeclarativeClassPrivate::get(m_class);
    p->context = reinterpret_cast<QScriptContext *>(exec);
    QScriptClass::QueryFlags flags = 
        m_class->queryProperty(m_object, identifier, QScriptClass::HandlesWriteAccess);
    if (flags & QScriptClass::HandlesWriteAccess) {
        m_class->setProperty(m_object, identifier, engine->scriptValueFromJSCValue(value));
        p->context = 0;
        return;
    }
    p->context = 0;

    QScriptObjectDelegate::put(object, exec, propertyName, value, slot);
}

bool DeclarativeObjectDelegate::deleteProperty(QScriptObject* object, JSC::ExecState *exec,
                                               const JSC::Identifier &propertyName)
{
    return QScriptObjectDelegate::deleteProperty(object, exec, propertyName);
}

void DeclarativeObjectDelegate::getOwnPropertyNames(QScriptObject* object, JSC::ExecState *exec,
                                                    JSC::PropertyNameArray &propertyNames,
                                                    JSC::EnumerationMode mode)
{
    QStringList properties = m_class->propertyNames(m_object);
    for (int ii = 0; ii < properties.count(); ++ii) {
        const QString &name = properties.at(ii);
        propertyNames.add(JSC::Identifier(exec, name));
    }

    QScriptObjectDelegate::getOwnPropertyNames(object, exec, propertyNames, mode);
}

JSC::CallType DeclarativeObjectDelegate::getCallData(QScriptObject *object, JSC::CallData &callData)
{
    if (!QScriptDeclarativeClassPrivate::get(m_class)->supportsCall) 
        return JSC::CallTypeNone;
    callData.native.function = call;
    return JSC::CallTypeHost;
}

JSC::JSValue DeclarativeObjectDelegate::call(JSC::ExecState *exec, JSC::JSObject *callee,
                                             JSC::JSValue thisValue, const JSC::ArgList &args)
{
    if (!callee->inherits(&QScriptObject::info))
        return JSC::throwError(exec, JSC::TypeError, "callee is not a DeclarativeObject object");
    QScriptObject *obj = static_cast<QScriptObject*>(callee);
    QScriptObjectDelegate *delegate = obj->delegate();
    if (!delegate || (delegate->type() != QScriptObjectDelegate::DeclarativeClassObject))
        return JSC::throwError(exec, JSC::TypeError, "callee is not a DeclarativeObject object");

    QScriptDeclarativeClass *scriptClass = static_cast<DeclarativeObjectDelegate*>(delegate)->m_class;
    QScriptEnginePrivate *eng_p = scriptEngineFromExec(exec);

    QScript::SaveFrameHelper saveFrame(eng_p, exec);
    eng_p->pushContext(exec, thisValue, args, callee);
    QScriptContext *ctxt = eng_p->contextForFrame(eng_p->currentFrame);

    QScriptValue scriptObject = eng_p->scriptValueFromJSCValue(obj);
    QScriptDeclarativeClass::Value result = 
        scriptClass->call(static_cast<DeclarativeObjectDelegate*>(delegate)->m_object, ctxt);

    eng_p->popContext();
    return (JSC::JSValue &)(result);
}

JSC::ConstructType DeclarativeObjectDelegate::getConstructData(QScriptObject* object, JSC::ConstructData &constructData)
{
    return QScriptObjectDelegate::getConstructData(object, constructData);
}

bool DeclarativeObjectDelegate::hasInstance(QScriptObject* object, JSC::ExecState *exec,
                                            JSC::JSValue value, JSC::JSValue proto)
{
    return QScriptObjectDelegate::hasInstance(object, exec, value, proto);
}

bool DeclarativeObjectDelegate::compareToObject(QScriptObject *o, JSC::ExecState *exec, JSC::JSObject *o2)
{
    if (!o2->inherits(&QScriptObject::info))
        return false;
    
    QScriptObject *scriptObject = static_cast<QScriptObject*>(o2);
    QScriptObjectDelegate *delegate = scriptObject->delegate();
    if (!delegate || (delegate->type() != QScriptObjectDelegate::DeclarativeClassObject))
        return false;

    DeclarativeObjectDelegate *other = static_cast<DeclarativeObjectDelegate*>(delegate);
    if (m_class != other->m_class)
        return false;
    else
        return m_class->compare(m_object, other->m_object);
}

} // namespace QScript

QT_END_NAMESPACE