1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/*
* Generates all possible matching inputs for a command string.
* --
* Copyright (C) 2016 Cumulus Networks, Inc.
*
* This file is part of GNU Zebra.
*
* GNU Zebra 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 2, or (at your option) any
* later version.
*
* GNU Zebra 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 COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "command.h"
#include "graph.h"
#include "vector.h"
#define USAGE "usage: permutations <cmdstr>"
void permute(struct graph_node *);
void pretty_print_graph(struct graph_node *start, int level);
int main(int argc, char *argv[])
{
if (argc < 2) {
fprintf(stdout, USAGE "\n");
exit(EXIT_SUCCESS);
}
struct cmd_element *cmd = calloc(1, sizeof(struct cmd_element));
cmd->string = strdup(argv[1]);
struct graph *graph = graph_new();
struct cmd_token *token =
cmd_token_new(START_TKN, cmd->attr, NULL, NULL);
graph_new_node(graph, token, NULL);
cmd_graph_parse(graph, cmd);
permute(vector_slot(graph->nodes, 0));
}
void permute(struct graph_node *start)
{
static struct list *position = NULL;
if (!position)
position = list_new();
struct cmd_token *stok = start->data;
struct graph_node *gnn;
struct listnode *ln;
// recursive dfs
listnode_add(position, start);
for (unsigned int i = 0; i < vector_active(start->to); i++) {
struct graph_node *gn = vector_slot(start->to, i);
struct cmd_token *tok = gn->data;
if (tok->attr == CMD_ATTR_HIDDEN
|| tok->attr == CMD_ATTR_DEPRECATED)
continue;
else if (tok->type == END_TKN || gn == start) {
fprintf(stdout, " ");
for (ALL_LIST_ELEMENTS_RO(position, ln, gnn)) {
struct cmd_token *tt = gnn->data;
if (tt->type < SPECIAL_TKN)
fprintf(stdout, " %s", tt->text);
}
if (gn == start)
fprintf(stdout, "...");
fprintf(stdout, "\n");
} else {
bool skip = false;
if (stok->type == FORK_TKN && tok->type != FORK_TKN)
for (ALL_LIST_ELEMENTS_RO(position, ln, gnn))
if (gnn == gn) {
skip = true;
break;
}
if (!skip)
permute(gn);
}
}
list_delete_node(position, listtail(position));
}
|
