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acddc0ed3c
Done with a combination of regex'ing and banging my head against a wall. Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Generates all possible matching inputs for a command string.
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* --
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* Copyright (C) 2016 Cumulus Networks, Inc.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "command.h"
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#include "graph.h"
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#include "vector.h"
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#define USAGE "usage: permutations <cmdstr>"
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void permute(struct graph_node *);
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void pretty_print_graph(struct graph_node *start, int level);
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int main(int argc, char *argv[])
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{
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if (argc < 2) {
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fprintf(stdout, USAGE "\n");
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exit(EXIT_SUCCESS);
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}
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struct cmd_element *cmd = XCALLOC(MTYPE_TMP,
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sizeof(struct cmd_element));
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cmd->string = strdup(argv[1]);
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struct graph *graph = graph_new();
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struct cmd_token *token =
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cmd_token_new(START_TKN, cmd->attr, NULL, NULL);
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graph_new_node(graph, token, NULL);
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cmd_graph_parse(graph, cmd);
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permute(vector_slot(graph->nodes, 0));
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}
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void permute(struct graph_node *start)
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{
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static struct list *position = NULL;
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if (!position)
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position = list_new();
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struct cmd_token *stok = start->data;
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struct graph_node *gnn;
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struct listnode *ln;
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bool is_neg = false;
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// recursive dfs
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listnode_add(position, start);
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for (ALL_LIST_ELEMENTS_RO(position, ln, gnn)) {
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struct cmd_token *tok = gnn->data;
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if (tok->type == WORD_TKN && !strcmp(tok->text, "no")) {
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is_neg = true;
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break;
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}
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if (tok->type < SPECIAL_TKN)
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break;
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}
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for (unsigned int i = 0; i < vector_active(start->to); i++) {
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struct graph_node *gn = vector_slot(start->to, i);
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struct cmd_token *tok = gn->data;
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if (tok->attr & CMD_ATTR_HIDDEN)
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continue;
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else if (tok->type == END_TKN || gn == start) {
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fprintf(stdout, " ");
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for (ALL_LIST_ELEMENTS_RO(position, ln, gnn)) {
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struct cmd_token *tt = gnn->data;
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if (tt->type < SPECIAL_TKN)
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fprintf(stdout, " %s", tt->text);
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}
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if (gn == start)
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fprintf(stdout, "...");
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fprintf(stdout, "\n");
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} else {
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bool skip = false;
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if (tok->type == NEG_ONLY_TKN && !is_neg)
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continue;
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if (stok->type == FORK_TKN && tok->type != FORK_TKN)
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for (ALL_LIST_ELEMENTS_RO(position, ln, gnn))
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if (gnn == gn) {
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skip = true;
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break;
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}
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if (!skip)
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permute(gn);
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}
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}
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list_delete_node(position, listtail(position));
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}
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