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author | tpearson <tpearson@283d02a7-25f6-0310-bc7c-ecb5cbfe19da> | 2010-01-09 06:41:55 +0000 |
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committer | tpearson <tpearson@283d02a7-25f6-0310-bc7c-ecb5cbfe19da> | 2010-01-09 06:41:55 +0000 |
commit | 8bec1dda934fa75cbb1402c58cb879b23305dc40 (patch) | |
tree | b4294963397117f1cf022e7a62452697df996de3 /src/evaluator.h | |
download | abakus-8bec1dda934fa75cbb1402c58cb879b23305dc40.tar.gz abakus-8bec1dda934fa75cbb1402c58cb879b23305dc40.zip |
Add abakus
git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/applications/abakus@1071969 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
Diffstat (limited to 'src/evaluator.h')
-rw-r--r-- | src/evaluator.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/evaluator.h b/src/evaluator.h new file mode 100644 index 0000000..2d156eb --- /dev/null +++ b/src/evaluator.h @@ -0,0 +1,131 @@ +/* This file was part of the SpeedCrunch project + Copyright (C) 2004 Ariya Hidayat <[email protected]> + + And is now part of abakus. + Copyright (c) 2005 Michael Pyne <[email protected]> + + 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 02110-1301, 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: |