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-rw-r--r--tools/permutations.c96
1 files changed, 96 insertions, 0 deletions
diff --git a/tools/permutations.c b/tools/permutations.c
new file mode 100644
index 0000000..f3883b1
--- /dev/null
+++ b/tools/permutations.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Generates all possible matching inputs for a command string.
+ * --
+ * Copyright (C) 2016 Cumulus Networks, Inc.
+ */
+
+#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 = XCALLOC(MTYPE_TMP,
+ 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;
+ bool is_neg = false;
+
+ // recursive dfs
+ listnode_add(position, start);
+
+ for (ALL_LIST_ELEMENTS_RO(position, ln, gnn)) {
+ struct cmd_token *tok = gnn->data;
+
+ if (tok->type == WORD_TKN && !strcmp(tok->text, "no")) {
+ is_neg = true;
+ break;
+ }
+ if (tok->type < SPECIAL_TKN)
+ break;
+ }
+
+ 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)
+ 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 (tok->type == NEG_ONLY_TKN && !is_neg)
+ continue;
+ 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));
+}