/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtDeclarative module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL-ONLY$

** 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.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

** $QT_END_LICENSE$

**

****************************************************************************/

#include "qscriptdeclarativeclass_p.h"

#include "qscriptdeclarativeobject_p.h"

#include "qscriptobject_p.h"

#include <QtScript/qscriptstring.h>

#include <QtScript/qscriptengine.h>

#include <QtScript/qscriptengineagent.h>

#include <private/qscriptengine_p.h>

#include <private/qscriptvalue_p.h>

#include <private/qscriptqobject_p.h>

#include <private/qscriptactivationobject_p.h>

#include <QtCore/qstringlist.h>

QT_BEGIN_NAMESPACE

QScriptDeclarativeClass::PersistentIdentifier::PersistentIdentifier()

{

    new (&d) JSC::Identifier();

}

QScriptDeclarativeClass::PersistentIdentifier::~PersistentIdentifier()

{

    ((JSC::Identifier &)d).JSC::Identifier::~Identifier();

}

QScriptDeclarativeClass::PersistentIdentifier::PersistentIdentifier(const PersistentIdentifier &other)

{

    identifier = other.identifier;

    new (&d) JSC::Identifier((JSC::Identifier &)(other.d));

}

QScriptDeclarativeClass::PersistentIdentifier &

QScriptDeclarativeClass::PersistentIdentifier::operator=(const PersistentIdentifier &other)

{

    identifier = other.identifier;

    ((JSC::Identifier &)d) = (JSC::Identifier &)(other.d);

    return *this;

}

QScriptDeclarativeClass::QScriptDeclarativeClass(QScriptEngine *engine)

: d_ptr(new QScriptDeclarativeClassPrivate)

{

    Q_ASSERT(sizeof(void*) == sizeof(JSC::Identifier));

    d_ptr->q_ptr = this;

    d_ptr->engine = engine;

}

QScriptValue QScriptDeclarativeClass::newObject(QScriptEngine *engine, 

                                                QScriptDeclarativeClass *scriptClass, 

                                                Object *object)

{

    Q_ASSERT(engine);

    Q_ASSERT(scriptClass);

    QScriptEnginePrivate *p = static_cast<QScriptEnginePrivate *>(QObjectPrivate::get(engine)); 

    JSC::ExecState* exec = p->currentFrame;

    QScriptObject *result = new (exec) QScriptObject(p->scriptObjectStructure);

    result->setDelegate(new QScript::DeclarativeObjectDelegate(scriptClass, object));

    return p->scriptValueFromJSCValue(result);

}

QScriptDeclarativeClass *QScriptDeclarativeClass::scriptClass(const QScriptValue &v)

{

    QScriptValuePrivate *d = QScriptValuePrivate::get(v);

    if (!d || !d->isJSC() || !d->jscValue.inherits(&QScriptObject::info))

        return 0;

    QScriptObject *scriptObject = static_cast<QScriptObject*>(JSC::asObject(d->jscValue));

    QScriptObjectDelegate *delegate = scriptObject->delegate();

    if (!delegate || (delegate->type() != QScriptObjectDelegate::DeclarativeClassObject))

        return 0;

    return static_cast<QScript::DeclarativeObjectDelegate*>(delegate)->scriptClass();

}

QScriptDeclarativeClass::Object *QScriptDeclarativeClass::object(const QScriptValue &v)

{

    QScriptValuePrivate *d = QScriptValuePrivate::get(v);

    if (!d || !d->isJSC() || !d->jscValue.inherits(&QScriptObject::info))

        return 0;

    QScriptObject *scriptObject = static_cast<QScriptObject*>(JSC::asObject(d->jscValue));

    QScriptObjectDelegate *delegate = scriptObject->delegate();

    if (!delegate || (delegate->type() != QScriptObjectDelegate::DeclarativeClassObject))

        return 0;

    return static_cast<QScript::DeclarativeObjectDelegate*>(delegate)->object();

}

QScriptValue QScriptDeclarativeClass::function(const QScriptValue &v, const Identifier &name)

{

    QScriptValuePrivate *d = QScriptValuePrivate::get(v);

    if (!d->isObject())

        return QScriptValue();

    JSC::ExecState *exec = d->engine->currentFrame;

    JSC::JSObject *object = d->jscValue.getObject();

    JSC::PropertySlot slot(const_cast<JSC::JSObject*>(object));

    JSC::JSValue result;

    JSC::Identifier id(exec, (JSC::UString::Rep *)name);

    if (const_cast<JSC::JSObject*>(object)->getOwnPropertySlot(exec, id, slot)) {

        result = slot.getValue(exec, id);

        if (QScript::isFunction(result))

            return d->engine->scriptValueFromJSCValue(result);

    }

    return QScriptValue();

}

QScriptValue QScriptDeclarativeClass::property(const QScriptValue &v, const Identifier &name)

{

    QScriptValuePrivate *d = QScriptValuePrivate::get(v);

    if (!d->isObject())

        return QScriptValue();

    JSC::ExecState *exec = d->engine->currentFrame;

    JSC::JSObject *object = d->jscValue.getObject();

    JSC::PropertySlot slot(const_cast<JSC::JSObject*>(object));

    JSC::JSValue result;

    JSC::Identifier id(exec, (JSC::UString::Rep *)name);

    if (const_cast<JSC::JSObject*>(object)->getOwnPropertySlot(exec, id, slot)) {

        result = slot.getValue(exec, id);

        return d->engine->scriptValueFromJSCValue(result);

    }

    return QScriptValue();

}

/*

Returns the scope chain entry at \a index.  If index is less than 0, returns

entries starting at the end.  For example, scopeChainValue(context, -1) will return

the value last in the scope chain.

*/

QScriptValue QScriptDeclarativeClass::scopeChainValue(QScriptContext *context, int index)

{

    context->activationObject(); //ensure the creation of the normal scope for native context

    const JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(context);

    QScriptEnginePrivate *engine = QScript::scriptEngineFromExec(frame);

    JSC::ScopeChainNode *node = frame->scopeChain();

    JSC::ScopeChainIterator it(node);

    if (index < 0) {

        int count = 0;

        for (it = node->begin(); it != node->end(); ++it) 

            ++count;

        index = qAbs(index);

        if (index > count)

            return QScriptValue();

        else

            index = count - index;

    }

    for (it = node->begin(); it != node->end(); ++it) {

        if (index == 0) {

            JSC::JSObject *object = *it;

            if (!object) return QScriptValue();

            if (object->inherits(&QScript::QScriptActivationObject::info)

                    && (static_cast<QScript::QScriptActivationObject*>(object)->delegate() != 0)) {

                // Return the object that property access is being delegated to

                object = static_cast<QScript::QScriptActivationObject*>(object)->delegate();

            }

            return engine->scriptValueFromJSCValue(object);

        } else {

            --index;

        }

    }

    return QScriptValue();

}

/*!

  Enters a new execution context and returns the associated

  QScriptContext object.

  Once you are done with the context, you should call popContext() to

  restore the old context.

  By default, the `this' object of the new context is the Global Object.

  The context's \l{QScriptContext::callee()}{callee}() will be invalid.

  Unlike pushContext(), the default scope chain is reset to include

  only the global object and the QScriptContext's activation object.

  \sa QScriptEngine::popContext()

*/

QScriptContext * QScriptDeclarativeClass::pushCleanContext(QScriptEngine *engine)

{

    if (!engine)

        return 0;

    QScriptEnginePrivate *d = QScriptEnginePrivate::get(engine);

    JSC::CallFrame* newFrame = d->pushContext(d->currentFrame, 

                                              d->currentFrame->globalData().dynamicGlobalObject,

                                              JSC::ArgList(), /*callee = */0, false, true);

    if (engine->agent())

        engine->agent()->contextPush();

    return d->contextForFrame(newFrame);

}

QScriptDeclarativeClass::~QScriptDeclarativeClass()

{

}

QScriptEngine *QScriptDeclarativeClass::engine() const

{

    return d_ptr->engine;

}

QScriptDeclarativeClass::PersistentIdentifier 

QScriptDeclarativeClass::createPersistentIdentifier(const QString &str)

{

    QScriptEnginePrivate *p = 

        static_cast<QScriptEnginePrivate *>(QObjectPrivate::get(d_ptr->engine)); 

    JSC::ExecState* exec = p->currentFrame;

    PersistentIdentifier rv(true);

    new (&rv.d) JSC::Identifier(exec, (UChar *)str.constData(), str.size());

    rv.identifier = (void *)((JSC::Identifier &)rv.d).ustring().rep();

    return rv;

}

QScriptDeclarativeClass::PersistentIdentifier 

QScriptDeclarativeClass::createPersistentIdentifier(const Identifier &id)

{

    QScriptEnginePrivate *p = 

        static_cast<QScriptEnginePrivate *>(QObjectPrivate::get(d_ptr->engine)); 

    JSC::ExecState* exec = p->currentFrame;

    PersistentIdentifier rv(true);

    new (&rv.d) JSC::Identifier(exec, (JSC::UString::Rep *)id);

    rv.identifier = (void *)((JSC::Identifier &)rv.d).ustring().rep();

    return rv;

}

QString QScriptDeclarativeClass::toString(const Identifier &identifier)

{

    JSC::UString::Rep *r = (JSC::UString::Rep *)identifier;

    return QString((QChar *)r->data(), r->size());

}

quint32 QScriptDeclarativeClass::toArrayIndex(const Identifier &identifier, bool *ok)

{

    JSC::UString::Rep *r = (JSC::UString::Rep *)identifier;

    JSC::UString s(r);

    return s.toArrayIndex(ok);

}

QScriptClass::QueryFlags 

QScriptDeclarativeClass::queryProperty(Object *object, const Identifier &name, 

                                       QScriptClass::QueryFlags flags)

{

    Q_UNUSED(object);

    Q_UNUSED(name);

    Q_UNUSED(flags);

    return 0;

}

QScriptValue QScriptDeclarativeClass::property(Object *object, const Identifier &name)

{

    Q_UNUSED(object);

    Q_UNUSED(name);

    return QScriptValue();

}

void QScriptDeclarativeClass::setProperty(Object *object, const Identifier &name, 

                                          const QScriptValue &value)

{

    Q_UNUSED(object);

    Q_UNUSED(name);

    Q_UNUSED(value);

}

QScriptValue::PropertyFlags 

QScriptDeclarativeClass::propertyFlags(Object *object, const Identifier &name)

{

    Q_UNUSED(object);

    Q_UNUSED(name);

    return 0;

}

QStringList QScriptDeclarativeClass::propertyNames(Object *object)

{

    Q_UNUSED(object);

    return QStringList();

}

bool QScriptDeclarativeClass::isQObject() const

{

    return false;

}

QObject *QScriptDeclarativeClass::toQObject(Object *, bool *ok)

{

    if (ok) *ok = false;

    return 0;

}

QVariant QScriptDeclarativeClass::toVariant(Object *, bool *ok)

{

    if (ok) *ok = false;

    return QVariant();

}

QScriptContext *QScriptDeclarativeClass::context() const

{

    return d_ptr->context;

}

QT_END_NAMESPACE