walk.c

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/**
 * \file
 *
 * \author  Georg Hopp
 *
 * \copyright
 * Copyright © 2012  Georg Hopp
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include "tree.h"

void
treeWalk(Tree this, TreeAction action)
{
    Tree previous = this;
    Tree node     = this;
    int  depth    = 1;

    while (NULL != node) {
        if (previous == TREE_RIGHT(node)) {
            previous = node;
            node     = node->parent;
            depth--;
            continue;
        }

        if (NULL == TREE_LEFT(node) || previous == TREE_LEFT(node)) {
            action(node->data, depth);
            previous = node;

            if (NULL != TREE_RIGHT(node)) {
                node = TREE_RIGHT(node);
                depth++;
            } else {
                node = TREE_PARENT(node);
                depth--;
            }
        } else {
            previous = node;
            node     = TREE_LEFT(node);
            depth++;
        }
    }
}

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