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/* This file was part of the SpeedCrunch project
Copyright (C) 2004 Ariya Hidayat <ariya@kde.org>
And is now part of abakus.
Copyright (c) 2005 Michael Pyne <michael.pyne@kdemail.net>
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef ABAKUS_EVALUATOR_H
#define ABAKUS_EVALUATOR_H
#include <qstring.h>
#include <qvaluevector.h>
#include "numerictypes.h"
class Token
{
public:
typedef enum
{
Unknown,
Number,
Operator,
Identifier
} Type;
typedef enum
{
InvalidOp = 0,
Plus, // + (addition)
Minus, // - (substraction, negation)
Asterisk, // * (multiplication)
Slash, // / (division)
Caret, // ^ (power) or **.
LeftPar, // (
RightPar, // )
Comma, // argument separator
Percent,
Equal // variable assignment
} Op;
Token( Type type = Unknown, const QString& text = QString::null, int pos = -1 );
Token( const Token& );
Token& operator=( const Token& );
Type type() const { return m_type; }
QString text() const { return m_text; }
int pos() const { return m_pos; };
bool isNumber() const { return m_type == Number; }
bool isOperator() const { return m_type == Operator; }
bool isIdentifier() const { return m_type == Identifier; }
Abakus::number_t asNumber() const;
Op asOperator() const;
QString description() const;
static const Token null;
protected:
Type m_type;
QString m_text;
int m_pos;
};
class Tokens: public QValueVector<Token>
{
public:
Tokens(): QValueVector<Token>(), m_valid(true) {};
bool valid() const { return m_valid; }
void setValid( bool v ) { m_valid = v; }
protected:
bool m_valid;
};
class Variable
{
public:
QString name;
Abakus::number_t value;
};
class Evaluator
{
public:
Evaluator();
~Evaluator();
void setExpression( const QString& expr );
QString expression() const;
void clear();
bool isValid() const;
Tokens tokens() const;
static Tokens scan( const QString& expr );
QString error() const;
// Abakus::number_t eval();
static QString autoFix( const QString& expr );
private:
Evaluator( const Evaluator& );
Evaluator& operator=( const Evaluator& );
};
#endif // EVALUATOR
// vim: set et ts=8 sw=4:
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