Import JSC-based Qt Script from Kent's tree.

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diff --git a/src/script/qscriptable.cpp b/src/script/qscriptable.cpp
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--- a/src/script/qscriptable.cpp
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-/****************************************************************************
-**
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
-** Contact: Qt Software Information (qt-info@nokia.com)
-**
-** This file is part of the QtScript module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** No Commercial Usage
-** This file contains pre-release code and may not be distributed.
-** You may use this file in accordance with the terms and conditions
-** contained in the either Technology Preview License Agreement or the
-** Beta Release License Agreement.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, 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 1.0, included in the file LGPL_EXCEPTION.txt in this
-** package.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3.0 as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL included in the
-** packaging of this file.  Please review the following information to
-** ensure the GNU General Public License version 3.0 requirements will be
-** met: http://www.gnu.org/copyleft/gpl.html.
-**
-** If you are unsure which license is appropriate for your use, please
-** contact the sales department at qt-sales@nokia.com.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QT_NO_QOBJECT
-
-#include "qscriptable.h"
-
-#ifndef QT_NO_SCRIPT
-
-#include "qscriptable_p.h"
-
-#include "qscriptengine.h"
-#include "qscriptcontext.h"
-#include "qscriptvalue.h"
-
-QT_BEGIN_NAMESPACE
-
-/*!
-  \since 4.3
-  \class QScriptable
-
-  \brief The QScriptable class provides access to the Qt Script environment from Qt C++ member functions.
-
-  \ingroup script
-  \mainclass
-
-  With QScriptEngine::newQObject(), you can expose the signals and
-  slots and properties of any QObject (or subclass) to script
-  code. QScriptable augments this functionality by giving your C++
-  members access to the Qt Script environment they are invoked in;
-  conceptually, it is similar to QObject::sender().
-
-  By subclassing QScriptable, you get the following functions in your
-  class: thisObject(), argumentCount(), argument(), context() and
-  engine(). With these functions, you have full access to the Qt
-  Script environment from the slots and property access functions of
-  your class, when they are invoked from script code.
-
-  For example, you can throw a Qt Script exception from a slot;
-  manipulate the `this' object associated with the function call;
-  inspect the arguments stored in the QScriptContext to know the
-  "real" arguments passed to the function from script code; and call
-  script functions from your slot.
-
-  A typical use case of QScriptable is to implement prototype objects
-  for custom C++ types. You define the scriptable interface of your
-  custom type in a QScriptable subclass using properties and slots;
-  then you wrap an instance of your class using
-  QScriptEngine::newQObject(), and finally pass the result to
-  QScriptEngine::setDefaultPrototype(). See the \l{Default Prototypes Example}
-  to see how this can be done.
-
-  The following is what subclassing QScriptable typically looks
-  like:
-
-  \snippet doc/src/snippets/code/src_script_qscriptable.cpp 0
-
-  The only difference from regular QObject subclassing is that you
-  also inherit from QScriptable.
-
-  In the implementation of your slots, you can then use the functions
-  inherited from QScriptable:
-
-  \snippet doc/src/snippets/code/src_script_qscriptable.cpp 1
-
-  \sa {Default Prototypes Example}, QScriptEngine::newFunction()
-*/
-
-/*!
-  \internal
-*/
-QScriptable::QScriptable()
-    : d_ptr(new QScriptablePrivate())
-{
-    d_ptr->q_ptr = this;
-}
-
-/*!
-  \internal
-*/
-QScriptable::~QScriptable()
-{
-    delete d_ptr;
-    d_ptr = 0;
-}
-
-/*!
-  Returns a pointer to the QScriptEngine associated with the current
-  Qt function call, or 0 if the Qt function was not invoked from
-  script code.
-*/
-QScriptEngine *QScriptable::engine() const
-{
-    Q_D(const QScriptable);
-    return d->engine;
-}
-
-/*!
-  Returns a pointer to the QScriptContext associated with the current
-  Qt function call, or 0 if the Qt function was not invoked from
-  script code.
-*/
-QScriptContext *QScriptable::context() const
-{
-    if (QScriptEngine *e = engine())
-        return e->currentContext();
-
-    return 0;
-}
-
-/*!
-  Returns the `this' object associated with the current Qt function
-  call, or an invalid QScriptValue if the Qt function was not invoked
-  from script code.
-*/
-
-QScriptValue QScriptable::thisObject() const
-{
-    if (QScriptContext *c = context())
-        return c->thisObject();
-
-    return QScriptValue();
-}
-
-/*!
-  Returns the number of arguments passed to the function in this
-  invocation, or -1 if the Qt function was not invoked from script
-  code.
-
-  \sa argument()
-*/
-int QScriptable::argumentCount() const
-{
-    if (QScriptContext *c = context())
-        return c->argumentCount();
-
-    return -1;
-}
-
-/*!
-  Returns the function argument at the given \a index, or an invalid
-  QScriptValue if the Qt function was not invoked from script code.
-
-  \sa argumentCount()
-*/
-QScriptValue QScriptable::argument(int index) const
-{
-    if (QScriptContext *c = context())
-        return c->argument(index);
-
-    return QScriptValue();
-}
-
-#endif // QT_NO_SCRIPT
-#endif // QT_NO_QOBJECT
-
-QT_END_NAMESPACE