org.btrplace.btrpsl.tree.AddOperator Maven / Gradle / Ivy

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/*
 * Copyright (c) 2016 University Nice Sophia Antipolis
 *
 * This file is part of btrplace.
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 */

package org.btrplace.btrpsl.tree;

import org.antlr.runtime.Token;
import org.btrplace.btrpsl.ErrorReporter;
import org.btrplace.btrpsl.element.BtrpOperand;
import org.btrplace.btrpsl.element.IgnorableOperand;

/**
 * A parser to sum two integers or to make the union between two sets with the same type
 *
 * @author Fabien Hermenier
 */
public class AddOperator extends BtrPlaceTree {

    /**
     * Make a new parser.
     *
     * @param t    the root token
     * @param errs the errors to report
     */
    public AddOperator(Token t, ErrorReporter errs) {
        super(t, errs);
    }

    @Override
    public BtrpOperand go(BtrPlaceTree parent) {
        BtrpOperand l = getChild(0).go(this);
        if (getChildCount() == 2) {
            BtrpOperand r = getChild(1).go(this);
            if (l != IgnorableOperand.getInstance() && r != IgnorableOperand.getInstance()) {
                return l.plus(r);
            }
            return IgnorableOperand.getInstance();
        }
        return l;
    }
}