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/*
* 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 GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#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 = new_cmd_token (START_TKN, cmd->attr, NULL, NULL);
graph_new_node (graph, token, NULL);
command_parse_format (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));
}
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