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**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Build Suite.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** use the contact form at http://qt.digia.com/contact-us.
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** 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
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****************************************************************************/
#ifndef QBS_RULESEVALUATIONCONTEXT_H
#define QBS_RULESEVALUATIONCONTEXT_H

#include <language/forward_decls.h>

#include <QHash>
#include <QScriptProgram>
#include <QScriptValue>
#include <QString>

namespace qbs {
namespace Internal {
class Logger;
class ProgressObserver;
class ScriptEngine;

class RulesEvaluationContext
{
public:
    RulesEvaluationContext(const Logger &logger);
    ~RulesEvaluationContext();

    class Scope
    {
    public:
        Scope(RulesEvaluationContext *evalContext);
        ~Scope();

    private:
        RulesEvaluationContext * const m_evalContext;
    };

    ScriptEngine *engine() const { return m_engine; }
    QScriptValue scope() const { return m_scope; }

    void setObserver(ProgressObserver *observer) { m_observer = observer; }
    ProgressObserver *observer() const { return m_observer; }
    void initializeObserver(const QString &description, int maximumProgress);
    void incrementProgressValue();
    void checkForCancelation();

private:
    friend class Scope;

    void initScope();
    void cleanupScope();

    ScriptEngine * const m_engine;
    ProgressObserver *m_observer;
    unsigned int m_initScopeCalls;
    QScriptValue m_scope;
    QScriptValue m_prepareScriptScope;
};

} // namespace Internal
} // namespace qbs

#endif // QBS_RULESEVALUATIONCONTEXT_H