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/*************************************************************************************
 *  Copyright (C) 2007 by Aleix Pol <aleixpol@kde.org>                               *
 *                                                                                   *
 *  This program is free software; you can redistribute it and/or                    *
 *  modify it under the terms of the GNU General Public License                      *
 *  as published by the Free Software Foundation; either version 2                   *
 *  of the License, or (at your option) any later version.                           *
 *                                                                                   *
 *  This program is distributed in the hope that it will be useful,                  *
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of                   *
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                    *
 *  GNU General Public License for more details.                                     *
 *                                                                                   *
 *  You should have received a copy of the GNU General Public License                *
 *  along with this program; if not, write to the Free Software                      *
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA   *
 *************************************************************************************/

#ifndef OBJECT_H
#define OBJECT_H

#include <QDebug>

#include "analitzaexport.h"

namespace Analitza
{

class AbstractExpressionVisitor;

/**
 *	\internal
 *	Abstract expression tree node
 *	@author Aleix Pol <aleixpol@kde.org>  
 */

//FIXME: Check for public -> protected on some members
class ANALITZA_EXPORT Object
{
public:
	/** ObjectType is used to describe objects. */
	enum ObjectType {
		none=0,		/**< No object type, usually means an error. */
		value,		/**< Describes an object as a value. */
		variable,	/**< Describes an object as a variable. */
		vector,		/**< Describes an object as a vector. */
		list,		/**< Describes an object as a list. */
		apply,		/**< Describes an object as an application. */
		oper,		/**< Describes an object as an operator. */
		container,	/**< Describes an object as a container. */
		matrix,		/**< Describes an object as a matrix. */
		matrixrow,	/**< Describes an object as a matrix row. */
		custom		/**< Describes a custom object */
	};
	
	/** Object destructor. Does nothing. */
	virtual ~Object() { /*qDebug() << "Destroying " << this;*/}
	
	/** Returns the object type of the object */
	enum ObjectType type() const { return m_type; }
	
	/** Returns whether it is an apply or not. */
	bool isApply() const { return m_type==apply; }
	
	/** Returns whether it is a container or not. */
	bool isContainer() const { return m_type==container; }
	
	/** Returns the string representation of the object. */
	QString toString() const;
	
	/** Returns some string depending on the visior */
	virtual QVariant accept(AbstractExpressionVisitor* exp) const = 0;
	
	virtual bool isZero() const { return false; }
	
	/** 
		@p exp is the tree that we will compare to,
		@p found is where we will pass the variables store the results.
		
		It will return whether the object follows the @p pattern structure.
	*/
	virtual bool matches(const Object* exp, QMap<QString, const Object*>* found) const=0;
	
	/** @returns a new and equal instance of the tree. */
	virtual Object* copy() const =0;
	
protected:
	/** Creates an object with a @p t type */
	Object(enum ObjectType t) : m_type(t) {}
	
	/** Specifies the Object type. */
	const ObjectType m_type;
};

}
#endif