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/****************************************************************************
**
** 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Technology Preview License Agreement accompanying
** this package.
**
** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QDECLARATIVEEXPRESSION_P_H
#define QDECLARATIVEEXPRESSION_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "qdeclarativeexpression.h"
#include "private/qdeclarativeengine_p.h"
#include "private/qdeclarativeguard_p.h"
#include <QtScript/qscriptvalue.h>
QT_BEGIN_NAMESPACE
class QDeclarativeAbstractExpression
{
public:
QDeclarativeAbstractExpression();
virtual ~QDeclarativeAbstractExpression();
bool isValid() const;
QDeclarativeContextData *context() const;
void setContext(QDeclarativeContextData *);
virtual void refresh();
private:
friend class QDeclarativeContext;
friend class QDeclarativeContextData;
friend class QDeclarativeContextPrivate;
QDeclarativeContextData *m_context;
QDeclarativeAbstractExpression **m_prevExpression;
QDeclarativeAbstractExpression *m_nextExpression;
};
class QDeclarativeDelayedError
{
public:
inline QDeclarativeDelayedError() : nextError(0), prevError(0) {}
inline ~QDeclarativeDelayedError() { removeError(); }
QDeclarativeError error;
bool addError(QDeclarativeEnginePrivate *);
inline void removeError() {
if (!prevError) return;
if (nextError) nextError->prevError = prevError;
*prevError = nextError;
nextError = 0;
prevError = 0;
}
private:
QDeclarativeDelayedError *nextError;
QDeclarativeDelayedError **prevError;
};
class QDeclarativeQtScriptExpression : public QDeclarativeAbstractExpression,
public QDeclarativeDelayedError
{
public:
enum Mode { SharedContext, ExplicitContext };
QDeclarativeQtScriptExpression();
virtual ~QDeclarativeQtScriptExpression();
QDeclarativeRefCount *dataRef;
QString expression;
Mode expressionFunctionMode;
QScriptValue expressionFunction;
QScriptValue expressionContext; // Only used in ExplicitContext
QObject *scopeObject; // Only used in SharedContext
bool notifyOnValueChange() const;
void setNotifyOnValueChange(bool);
void resetNotifyOnChange();
void setNotifyObject(QObject *, int );
QScriptValue scriptValue(QObject *secondaryScope, bool *isUndefined);
class DeleteWatcher {
public:
inline DeleteWatcher(QDeclarativeQtScriptExpression *data);
inline ~DeleteWatcher();
inline bool wasDeleted() const;
private:
bool *m_wasDeleted;
bool m_wasDeletedStorage;
QDeclarativeQtScriptExpression *m_d;
};
private:
void clearGuards();
QScriptValue eval(QObject *secondaryScope, bool *isUndefined);
void updateGuards(const QPODVector<QDeclarativeEnginePrivate::CapturedProperty> &properties);
bool trackChange;
QDeclarativeNotifierEndpoint *guardList;
int guardListLength;
QObject *guardObject;
int guardObjectNotifyIndex;
bool *deleted;
};
class QDeclarativeExpression;
class QString;
class QDeclarativeExpressionPrivate : public QObjectPrivate, public QDeclarativeQtScriptExpression
{
Q_DECLARE_PUBLIC(QDeclarativeExpression)
public:
QDeclarativeExpressionPrivate();
~QDeclarativeExpressionPrivate();
void init(QDeclarativeContextData *, const QString &, QObject *);
void init(QDeclarativeContextData *, void *, QDeclarativeRefCount *, QObject *, const QString &, int);
QVariant value(QObject *secondaryScope = 0, bool *isUndefined = 0);
QScriptValue scriptValue(QObject *secondaryScope = 0, bool *isUndefined = 0);
static QDeclarativeExpressionPrivate *get(QDeclarativeExpression *expr) {
return static_cast<QDeclarativeExpressionPrivate *>(QObjectPrivate::get(expr));
}
static QDeclarativeExpression *get(QDeclarativeExpressionPrivate *expr) {
return expr->q_func();
}
void _q_notify();
virtual void emitValueChanged();
static void exceptionToError(QScriptEngine *, QDeclarativeError &);
static QScriptValue evalInObjectScope(QDeclarativeContextData *, QObject *, const QString &, const QString &,
int, QScriptValue *);
static QScriptValue evalInObjectScope(QDeclarativeContextData *, QObject *, const QScriptProgram &,
QScriptValue *);
bool expressionFunctionValid:1;
QString url; // This is a QString for a reason. QUrls are slooooooow...
int line;
};
QDeclarativeQtScriptExpression::DeleteWatcher::DeleteWatcher(QDeclarativeQtScriptExpression *data)
: m_wasDeletedStorage(false), m_d(data)
{
if (!m_d->deleted)
m_d->deleted = &m_wasDeletedStorage;
m_wasDeleted = m_d->deleted;
}
QDeclarativeQtScriptExpression::DeleteWatcher::~DeleteWatcher()
{
if (false == *m_wasDeleted && m_wasDeleted == m_d->deleted)
m_d->deleted = 0;
}
bool QDeclarativeQtScriptExpression::DeleteWatcher::wasDeleted() const
{
return *m_wasDeleted;
}
QT_END_NAMESPACE
#endif // QDECLARATIVEEXPRESSION_P_H
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