111 lines
3.0 KiB
C++
111 lines
3.0 KiB
C++
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// 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 base class.
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// ------------------------------------------------------------------
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#include <gdefs.h>
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#include <geval.h>
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// ------------------------------------------------------------------
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geval::geval() {
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// nothing to do
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}
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// ------------------------------------------------------------------
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geval::~geval() {
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// nothing
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}
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// ------------------------------------------------------------------
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geval::ops geval::pop_operator() {
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ops o = ostk.back();
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ostk.pop_back();
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return o;
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}
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// ------------------------------------------------------------------
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int geval::pop_value() {
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int v = vstk.back();
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vstk.pop_back();
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return v;
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}
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// ------------------------------------------------------------------
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void geval::push_value(int v) {
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vstk.push_back(v);
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}
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// ------------------------------------------------------------------
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void geval::push_operator(geval::ops o) {
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ostk.push_back(o);
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}
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// ------------------------------------------------------------------
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int geval::evaluate_op(geval::ops o, int y, int x) {
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switch(o) {
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case addition: return y + x;
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case subtraction: return y - x;
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case multiplication: return y * x;
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case division: return y / x;
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case modulus: return y % x;
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case negation: return -x;
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case logic_not: return (not x) ? 1 : 0;
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case logic_and: return (y and x) ? 1 : 0;
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case logic_xor: return (y ^ x) ? 1 : 0;
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case equal: return (y == x) ? 1 : 0;
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case not_equal: return (y != x) ? 1 : 0;
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case greater: return (y > x) ? 1 : 0;
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case greater_or_equal: return (y >= x) ? 1 : 0;
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case lesser: return (y < x) ? 1 : 0;
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case lesser_or_equal: return (y <= x) ? 1 : 0;
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default: ;
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}
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return 0;
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}
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// ------------------------------------------------------------------
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