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132 líneas
3.0 KiB
132 líneas
3.0 KiB
/* This file was part of the SpeedCrunch project
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Copyright (C) 2004 Ariya Hidayat <ariya@kde.org>
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And is now part of abakus.
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Copyright (c) 2005 Michael Pyne <michael.pyne@kdemail.net>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef ABAKUS_EVALUATOR_H
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#define ABAKUS_EVALUATOR_H
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#include <tqstring.h>
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#include <tqvaluevector.h>
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#include "numerictypes.h"
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class Token
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{
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public:
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typedef enum
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{
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Unknown,
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Number,
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Operator,
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Identifier
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} Type;
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typedef enum
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{
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InvalidOp = 0,
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Plus, // + (addition)
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Minus, // - (substraction, negation)
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Asterisk, // * (multiplication)
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Slash, // / (division)
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Caret, // ^ (power) or **.
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LeftPar, // (
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RightPar, // )
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Comma, // argument separator
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Percent,
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Equal // variable assignment
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} Op;
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Token( Type type = Unknown, const TQString& text = TQString(), int pos = -1 );
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Token( const Token& );
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Token& operator=( const Token& );
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Type type() const { return m_type; }
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TQString text() const { return m_text; }
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int pos() const { return m_pos; };
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bool isNumber() const { return m_type == Number; }
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bool isOperator() const { return m_type == Operator; }
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bool isIdentifier() const { return m_type == Identifier; }
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Abakus::number_t asNumber() const;
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Op asOperator() const;
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TQString description() const;
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static const Token null;
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protected:
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Type m_type;
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TQString m_text;
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int m_pos;
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};
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class Tokens: public TQValueVector<Token>
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{
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public:
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Tokens(): TQValueVector<Token>(), m_valid(true) {};
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bool valid() const { return m_valid; }
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void setValid( bool v ) { m_valid = v; }
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protected:
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bool m_valid;
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};
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class Variable
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{
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public:
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TQString name;
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Abakus::number_t value;
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};
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class Evaluator
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{
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public:
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Evaluator();
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~Evaluator();
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void setExpression( const TQString& expr );
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TQString expression() const;
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void clear();
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bool isValid() const;
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Tokens tokens() const;
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static Tokens scan( const TQString& expr );
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TQString error() const;
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// Abakus::number_t eval();
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static TQString autoFix( const TQString& expr );
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private:
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Evaluator( const Evaluator& );
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Evaluator& operator=( const Evaluator& );
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};
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#endif // EVALUATOR
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// vim: set et ts=8 sw=4:
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