84 lines
2.7 KiB
C
84 lines
2.7 KiB
C
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/* Et-forest data structure implementation.
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Copyright (C) 2002 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* This package implements ET forest data structure. Each tree in
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the structure maintains a tree structure and offers logarithmic time
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for tree operations (insertion and removal of nodes and edges) and
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poly-logarithmic time for nearest common ancesto.
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ET tree strores its structue as a sequence of symbols obtained
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by dfs(root)
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dfs (node)
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{
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s = node;
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for each child c of node do
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s = concat (s, c, node);
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return s;
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}
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For example for tree
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1
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/ | \
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2 3 4
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/ |
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4 5
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the sequence is 1 2 4 2 5 3 1 3 1 4 1.
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The sequence is stored in a sligtly modified splay tree.
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In order to support various types of node values, a hashtable
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is used to convert node values to the internal representation. */
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#ifndef _ET_TREE_H
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#define _ET_TREE_H
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#include <ansidecl.h>
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#include <stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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typedef struct et_forest *et_forest_t;
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typedef struct et_forest_node *et_forest_node_t;
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extern et_forest_t et_forest_create PARAMS ((void));
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extern void et_forest_delete PARAMS ((et_forest_t));
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extern et_forest_node_t et_forest_add_node PARAMS ((et_forest_t, void *));
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extern int et_forest_add_edge PARAMS ((et_forest_t, et_forest_node_t,
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et_forest_node_t));
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extern void et_forest_remove_node PARAMS ((et_forest_t, et_forest_node_t));
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extern int et_forest_remove_edge PARAMS ((et_forest_t, et_forest_node_t,
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et_forest_node_t));
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extern et_forest_node_t et_forest_parent PARAMS ((et_forest_t, et_forest_node_t));
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extern et_forest_node_t et_forest_common_ancestor PARAMS ((et_forest_t,
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et_forest_node_t,
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et_forest_node_t));
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extern void * et_forest_node_value PARAMS ((et_forest_t, et_forest_node_t));
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extern int et_forest_enumerate_sons PARAMS ((et_forest_t, et_forest_node_t,
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et_forest_node_t *));
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* _ET_TREE_H */
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