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deb-goldedplus/goldlib/gall/geval.cpp

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2000-02-25 10:15:17 +00:00
// This may look like C code, but it is really -*- C++ -*-
// ------------------------------------------------------------------
// The Goldware Library
// Copyright (C) 1990-1999 Odinn Sorensen
// ------------------------------------------------------------------
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library 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
// ------------------------------------------------------------------
// $Id$
// ------------------------------------------------------------------
// Expression evaluator base class.
// ------------------------------------------------------------------
#include <gdefs.h>
#include <geval.h>
// ------------------------------------------------------------------
geval::geval() {
// nothing to do
}
// ------------------------------------------------------------------
geval::~geval() {
// nothing
}
// ------------------------------------------------------------------
geval::ops geval::pop_operator() {
ops o = ostk.back();
ostk.pop_back();
return o;
}
// ------------------------------------------------------------------
int geval::pop_value() {
int v = vstk.back();
vstk.pop_back();
return v;
}
// ------------------------------------------------------------------
void geval::push_value(int v) {
vstk.push_back(v);
}
// ------------------------------------------------------------------
void geval::push_operator(geval::ops o) {
ostk.push_back(o);
}
// ------------------------------------------------------------------
int geval::evaluate_op(geval::ops o, int y, int x) {
switch(o) {
case addition: return y + x;
case subtraction: return y - x;
case multiplication: return y * x;
case division: return y / x;
case modulus: return y % x;
case negation: return -x;
case logic_not: return (not x) ? 1 : 0;
case logic_and: return (y and x) ? 1 : 0;
case logic_xor: return (y ^ x) ? 1 : 0;
case equal: return (y == x) ? 1 : 0;
case not_equal: return (y != x) ? 1 : 0;
case greater: return (y > x) ? 1 : 0;
case greater_or_equal: return (y >= x) ? 1 : 0;
case lesser: return (y < x) ? 1 : 0;
case lesser_or_equal: return (y <= x) ? 1 : 0;
default: ;
}
return 0;
}
// ------------------------------------------------------------------