132 lines
3.0 KiB
C++
132 lines
3.0 KiB
C++
// This may look like C code, but it is really -*- C++ -*-
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// ------------------------------------------------------------------
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// The Goldware Library
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// Copyright (C) 1990-1999 Odinn Sorensen
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// ------------------------------------------------------------------
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library 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 GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this program; if not, write to the Free
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// Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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// MA 02111-1307, USA
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// ------------------------------------------------------------------
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// $Id$
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// ------------------------------------------------------------------
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// Expression evaluator classes.
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// ------------------------------------------------------------------
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#ifndef __geval_h
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#define __geval_h
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// ------------------------------------------------------------------
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#include <vector>
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#include <gdefs.h>
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// ------------------------------------------------------------------
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// Base class
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class geval {
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public:
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enum ops {
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lowest,
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logic_or,
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logic_and,
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logic_xor,
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not_equal,
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equal,
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greater_or_equal,
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greater,
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lesser_or_equal,
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lesser,
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subtraction,
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addition,
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modulus,
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division,
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multiplication,
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negation,
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logic_not,
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parenthesis_right,
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parenthesis_left,
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highest
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};
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protected:
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std::vector<ops> ostk;
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std::vector<int> vstk;
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ops pop_operator();
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int pop_value();
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public:
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geval();
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~geval();
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void push_value(int v);
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void push_operator(ops o);
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int evaluate_op(ops o, int y, int x);
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int evaluate_ops(std::vector<ops>::iterator o, std::vector<int>::iterator y, std::vector<int>::iterator x);
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};
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// ------------------------------------------------------------------
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inline int geval::evaluate_ops(std::vector<ops>::iterator o, std::vector<int>::iterator y, std::vector<int>::iterator x) {
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return evaluate_op(*o, *y, *x);
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}
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// ------------------------------------------------------------------
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// Reverse Polish Notation expression evaluator.
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class gevalrpn : public geval {
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public:
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gevalrpn();
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~gevalrpn();
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int evaluate();
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};
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// ------------------------------------------------------------------
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// Human (left-to-right) expression evaluator.
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class gevalhum : public geval {
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public:
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gevalhum();
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~gevalhum();
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int evaluate();
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};
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// ------------------------------------------------------------------
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#endif
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// ------------------------------------------------------------------
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