| /* Et-forest data structure implementation. |
| Copyright (C) 2002-2018 Free Software Foundation, Inc. |
| |
| 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; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* This package implements ET forest data structure. Each tree in |
| the structure maintains a tree structure and offers logarithmic time |
| for tree operations (insertion and removal of nodes and edges) and |
| poly-logarithmic time for nearest common ancestor. |
| |
| ET tree stores its structure as a sequence of symbols obtained |
| by dfs(root) |
| |
| dfs (node) |
| { |
| s = node; |
| for each child c of node do |
| s = concat (s, c, node); |
| return s; |
| } |
| |
| For example for tree |
| |
| 1 |
| / | \ |
| 2 3 4 |
| / | |
| 4 5 |
| |
| the sequence is 1 2 4 2 5 3 1 3 1 4 1. |
| |
| The sequence is stored in a slightly modified splay tree. |
| In order to support various types of node values, a hashtable |
| is used to convert node values to the internal representation. */ |
| |
| #ifndef _ET_TREE_H |
| #define _ET_TREE_H |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif /* __cplusplus */ |
| |
| /* The node representing the node in an et tree. */ |
| struct et_node |
| { |
| void *data; /* The data represented by the node. */ |
| |
| int dfs_num_in, dfs_num_out; /* Number of the node in the dfs ordering. */ |
| |
| struct et_node *father; /* Father of the node. */ |
| struct et_node *son; /* The first of the sons of the node. */ |
| struct et_node *left; |
| struct et_node *right; /* The brothers of the node. */ |
| |
| struct et_occ *rightmost_occ; /* The rightmost occurrence. */ |
| struct et_occ *parent_occ; /* The occurrence of the parent node. */ |
| }; |
| |
| struct et_node *et_new_tree (void *data); |
| void et_free_tree (struct et_node *); |
| void et_free_tree_force (struct et_node *); |
| void et_free_pools (void); |
| void et_set_father (struct et_node *, struct et_node *); |
| void et_split (struct et_node *); |
| struct et_node *et_nca (struct et_node *, struct et_node *); |
| bool et_below (struct et_node *, struct et_node *); |
| struct et_node *et_root (struct et_node *); |
| |
| #ifdef __cplusplus |
| } |
| #endif /* __cplusplus */ |
| |
| #endif /* _ET_TREE_H */ |