source: trunk/src/script/api/qscriptvalueiterator.cpp@ 779

/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation ([email protected])
**
** This file is part of the QtScript 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 [email protected].
** $QT_END_LICENSE$
**
****************************************************************************/

#include "config.h"
#include "qscriptvalueiterator.h"

#include "qscriptstring.h"
#include "qscriptengine.h"
#include "qscriptengine_p.h"
#include "qscriptvalue_p.h"
#include "qlinkedlist.h"


#include "JSObject.h"
#include "PropertyNameArray.h"
#include "JSArray.h"
#include "JSFunction.h"

QT_BEGIN_NAMESPACE

/*!
  \since 4.3
  \class QScriptValueIterator

  \brief The QScriptValueIterator class provides a Java-style iterator for QScriptValue.

  \ingroup script


  The QScriptValueIterator constructor takes a QScriptValue as
  argument.  After construction, the iterator is located at the very
  beginning of the sequence of properties. Here's how to iterate over
  all the properties of a QScriptValue:

  \snippet doc/src/snippets/code/src_script_qscriptvalueiterator.cpp 0

  The next() advances the iterator. The name(), value() and flags()
  functions return the name, value and flags of the last item that was
  jumped over.

  If you want to remove properties as you iterate over the
  QScriptValue, use remove(). If you want to modify the value of a
  property, use setValue().

  Note that QScriptValueIterator only iterates over the QScriptValue's
  own properties; i.e. it does not follow the prototype chain. You can
  use a loop like this to follow the prototype chain:

  \snippet doc/src/snippets/code/src_script_qscriptvalueiterator.cpp 1

  Note that QScriptValueIterator will not automatically skip over
  properties that have the QScriptValue::SkipInEnumeration flag set;
  that flag only affects iteration in script code.  If you want, you
  can skip over such properties with code like the following:

  \snippet doc/src/snippets/code/src_script_qscriptvalueiterator.cpp 2

  \sa QScriptValue::property()
*/

class QScriptValueIteratorPrivate
{
public:
    QScriptValueIteratorPrivate()
        : initialized(false)
    {}
    void ensureInitialized()
    {
        if (initialized)
            return;
        QScriptEnginePrivate *eng_p = QScriptEnginePrivate::get(object.engine());
        JSC::ExecState *exec = eng_p->globalExec();
        JSC::PropertyNameArray propertyNamesArray(exec);
        propertyNamesArray.setShouldCache(false);
        JSC::asObject(QScriptValuePrivate::get(object)->jscValue)->getOwnPropertyNames(exec, propertyNamesArray, /*includeNonEnumerable=*/true);

        JSC::PropertyNameArray::const_iterator propertyNamesIt = propertyNamesArray.begin();
        for(; propertyNamesIt != propertyNamesArray.end(); ++propertyNamesIt) {
            propertyNames.append(propertyNamesIt->ustring());
        }
        it = propertyNames.begin();
        initialized = true;
    }

    QScriptValue object;