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authortpearson <tpearson@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2010-01-09 06:41:55 +0000
committertpearson <tpearson@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2010-01-09 06:41:55 +0000
commit8bec1dda934fa75cbb1402c58cb879b23305dc40 (patch)
treeb4294963397117f1cf022e7a62452697df996de3 /src/evaluator.h
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Add abakus
git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/applications/abakus@1071969 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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+/* 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: