expression.h

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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 EXPRESSION_H
#define EXPRESSION_H

#include <QStringList>
#include <QSharedDataPointer>

#include "analitzaexport.h"
#include "object.h"

namespace Analitza
{
class Ci;
class Container;
class Cn;

class ANALITZA_EXPORT Expression
{
    public:
        typedef void (*CustomObjectDestructor)(const QVariant&);
        Expression();
        
        Expression(const Expression& e);
        
        Expression(const Cn& e);
        
        explicit Expression(Object* o);
        
        explicit Expression(const QString& exp, bool mathml=false);
        
        ~Expression();
        
        bool setText(const QString &exp);
        
        bool setMathML(const QString &exp);
        
        QStringList error() const;
        
        void addError(const QString& error);
        
        bool isCorrect() const;
        
        bool operator==(const Expression& e) const;
        
        bool operator!=(const Expression& e) const;
        
        Expression operator=(const Expression& e);
        
        bool isLambda() const;
        
        Expression lambdaBody() const Q_REQUIRED_RESULT;
        
        bool isVector() const;
        
        bool isList() const;
        
        bool isString() const;
        
        Expression elementAt(int position) const;
        
        void setElementAt(int position, const Analitza::Expression& exp);
        
        const Object* tree() const;
        
        Object* tree();
        
        void setTree(Object* o);
        QString toString() const;
        
        QString toMathML() const;
        
        QString toHtml() const;
        
        QString toMathMLPresentation() const;
        
        QString stringValue() const;
        
        void clear();
        
        QStringList bvarList() const;
        
        Cn toReal() const;
        
        bool isReal() const;
        
        bool isCustomObject() const;
        
        QList<Ci*> parameters() const;
        
        QList<Expression> toExpressionList() const;
        
        QVariant customObjectValue() const;
        
        void renameArgument(int depth, const QString& newName);
        
        bool isEquation() const;
        
        bool isDeclaration() const;
        
        QString name() const;
        
        Expression declarationValue() const;
        
        Expression equationToFunction() const;
        
        QStringList comments() const;
        
        static enum Object::ObjectType whatType(const QString& tag);
        
        static bool isMathML(const QString& s) { return !s.isEmpty() && s[0]=='<'; }
        
        static void computeDepth(Object* o);
        
        static Expression constructList(const QList<Expression> & exps);
        
        static Expression constructCustomObject(const QVariant& custom, Analitza::Expression::CustomObjectDestructor d);
        
        static Expression constructString(const QString& str);
        
        static bool isCompleteExpression(const QString& exp, bool justempty=false);
    private:
        class ExpressionPrivate;
        QSharedDataPointer<ExpressionPrivate> d;
        QStringList m_comments;
};

}

#endif