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diff --git a/lib/grammar_sandbox.c b/lib/grammar_sandbox.c
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+/*
+ * Testing shim and API examples for the new CLI backend.
+ *
+ * This unit defines a number of commands in the old engine that can
+ * be used to test and interact with the new engine.
+ * --
+ * 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 "linklist.h"
+#include "command_match.h"
+
+#define GRAMMAR_STR "CLI grammar sandbox\n"
+
+DEFINE_MTYPE_STATIC(LIB, CMD_TOKENS, "Command desc");
+
+/** headers **/
+void grammar_sandbox_init(void);
+static void pretty_print_graph(struct vty *vty, struct graph_node *, int, int,
+ struct graph_node **, size_t);
+static void init_cmdgraph(struct vty *, struct graph **);
+
+/** shim interface commands **/
+static struct graph *nodegraph = NULL, *nodegraph_free = NULL;
+
+#define check_nodegraph() \
+ do { \
+ if (!nodegraph) { \
+ vty_out(vty, "nodegraph not initialized\n"); \
+ return CMD_WARNING; \
+ } \
+ } while (0)
+
+DEFUN (grammar_test,
+ grammar_test_cmd,
+ "grammar parse LINE...",
+ GRAMMAR_STR
+ "parse a command\n"
+ "command to pass to new parser\n")
+{
+ check_nodegraph();
+
+ int idx_command = 2;
+ // make a string from tokenized command line
+ char *command = argv_concat(argv, argc, idx_command);
+
+ // create cmd_element for parser
+ struct cmd_element *cmd =
+ XCALLOC(MTYPE_CMD_TOKENS, sizeof(struct cmd_element));
+ cmd->string = command;
+ cmd->doc =
+ "0\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n";
+ cmd->func = NULL;
+
+ // parse the command and install it into the command graph
+ struct graph *graph = graph_new();
+ struct cmd_token *token =
+ cmd_token_new(START_TKN, CMD_ATTR_NORMAL, NULL, NULL);
+ graph_new_node(graph, token, (void (*)(void *)) & cmd_token_del);
+
+ cmd_graph_parse(graph, cmd);
+ cmd_graph_merge(nodegraph, graph, +1);
+
+ return CMD_SUCCESS;
+}
+
+DEFUN (grammar_test_complete,
+ grammar_test_complete_cmd,
+ "grammar complete COMMAND...",
+ GRAMMAR_STR
+ "attempt to complete input on DFA\n"
+ "command to complete\n")
+{
+ check_nodegraph();
+
+ int idx_command = 2;
+ char *cmdstr = argv_concat(argv, argc, idx_command);
+ if (!cmdstr)
+ return CMD_SUCCESS;
+
+ vector command = cmd_make_strvec(cmdstr);
+ if (!command) {
+ XFREE(MTYPE_TMP, cmdstr);
+ return CMD_SUCCESS;
+ }
+
+ // generate completions of user input
+ struct list *completions;
+ enum matcher_rv result =
+ command_complete(nodegraph, command, &completions);
+
+ // print completions or relevant error message
+ if (!MATCHER_ERROR(result)) {
+ vector comps = completions_to_vec(completions);
+ struct cmd_token *tkn;
+
+ // calculate length of longest tkn->text in completions
+ unsigned int width = 0, i = 0;
+ for (i = 0; i < vector_active(comps); i++) {
+ tkn = vector_slot(comps, i);
+ unsigned int len = strlen(tkn->text);
+ width = len > width ? len : width;
+ }
+
+ // print completions
+ for (i = 0; i < vector_active(comps); i++) {
+ tkn = vector_slot(comps, i);
+ vty_out(vty, " %-*s %s\n", width, tkn->text,
+ tkn->desc);
+ }
+
+ for (i = 0; i < vector_active(comps); i++)
+ cmd_token_del(
+ (struct cmd_token *)vector_slot(comps, i));
+ vector_free(comps);
+ } else
+ vty_out(vty, "%% No match\n");
+
+ // free resources
+ list_delete(&completions);
+ cmd_free_strvec(command);
+ XFREE(MTYPE_TMP, cmdstr);
+
+ return CMD_SUCCESS;
+}
+
+DEFUN (grammar_test_match,
+ grammar_test_match_cmd,
+ "grammar match COMMAND...",
+ GRAMMAR_STR
+ "attempt to match input on DFA\n"
+ "command to match\n")
+{
+ check_nodegraph();
+
+ int idx_command = 2;
+ if (argv[2]->arg[0] == '#')
+ return CMD_SUCCESS;
+
+ char *cmdstr = argv_concat(argv, argc, idx_command);
+ if (!cmdstr)
+ return CMD_SUCCESS;
+ vector command = cmd_make_strvec(cmdstr);
+ if (!command) {
+ XFREE(MTYPE_TMP, cmdstr);
+ return CMD_SUCCESS;
+ }
+
+ struct list *argvv = NULL;
+ const struct cmd_element *element = NULL;
+ enum matcher_rv result =
+ command_match(nodegraph, command, &argvv, &element);
+
+ // print completions or relevant error message
+ if (element) {
+ vty_out(vty, "Matched: %s\n", element->string);
+ struct listnode *ln;
+ struct cmd_token *token;
+ for (ALL_LIST_ELEMENTS_RO(argvv, ln, token))
+ vty_out(vty, "%s -- %s\n", token->text, token->arg);
+
+ vty_out(vty, "func: %p\n", element->func);
+
+ list_delete(&argvv);
+ } else {
+ assert(MATCHER_ERROR(result));
+ switch (result) {
+ case MATCHER_NO_MATCH:
+ vty_out(vty, "%% Unknown command\n");
+ break;
+ case MATCHER_INCOMPLETE:
+ vty_out(vty, "%% Incomplete command\n");
+ break;
+ case MATCHER_AMBIGUOUS:
+ vty_out(vty, "%% Ambiguous command\n");
+ break;
+ default:
+ vty_out(vty, "%% Unknown error\n");
+ break;
+ }
+ }
+
+ // free resources
+ cmd_free_strvec(command);
+ XFREE(MTYPE_TMP, cmdstr);
+
+ return CMD_SUCCESS;
+}
+
+/**
+ * Testing shim to test docstrings
+ */
+DEFUN (grammar_test_doc,
+ grammar_test_doc_cmd,
+ "grammar test docstring",
+ GRAMMAR_STR
+ "Test function for docstring\n"
+ "Command end\n")
+{
+ check_nodegraph();
+
+ // create cmd_element with docstring
+ struct cmd_element *cmd =
+ XCALLOC(MTYPE_CMD_TOKENS, sizeof(struct cmd_element));
+ cmd->string = XSTRDUP(
+ MTYPE_CMD_TOKENS,
+ "test docstring <example|selector follow> (1-255) end VARIABLE [OPTION|set lol] . VARARG");
+ cmd->doc = XSTRDUP(MTYPE_CMD_TOKENS,
+ "Test stuff\n"
+ "docstring thing\n"
+ "first example\n"
+ "second example\n"
+ "follow\n"
+ "random range\n"
+ "end thingy\n"
+ "variable\n"
+ "optional variable\n"
+ "optional set\n"
+ "optional lol\n"
+ "vararg!\n");
+ cmd->func = NULL;
+
+ // parse element
+ cmd_graph_parse(nodegraph, cmd);
+
+ return CMD_SUCCESS;
+}
+
+/**
+ * Debugging command to print command graph
+ */
+DEFUN (grammar_test_show,
+ grammar_test_show_cmd,
+ "grammar show [doc]",
+ GRAMMAR_STR
+ "print current accumulated DFA\n"
+ "include docstrings\n")
+{
+ check_nodegraph();
+
+ struct graph_node *stack[CMD_ARGC_MAX];
+ pretty_print_graph(vty, vector_slot(nodegraph->nodes, 0), 0, argc >= 3,
+ stack, 0);
+ return CMD_SUCCESS;
+}
+
+DEFUN (grammar_test_dot,
+ grammar_test_dot_cmd,
+ "grammar dotfile OUTNAME",
+ GRAMMAR_STR
+ "print current graph for dot\n"
+ ".dot filename\n")
+{
+ check_nodegraph();
+ FILE *ofd = fopen(argv[2]->arg, "w");
+
+ if (!ofd) {
+ vty_out(vty, "%s: %s\r\n", argv[2]->arg, strerror(errno));
+ return CMD_SUCCESS;
+ }
+
+ char *dot = cmd_graph_dump_dot(nodegraph);
+
+ fprintf(ofd, "%s", dot);
+ fclose(ofd);
+ XFREE(MTYPE_TMP, dot);
+
+ return CMD_SUCCESS;
+}
+
+struct cmd_permute_item {
+ char *cmd;
+ struct cmd_element *el;
+};
+
+static void cmd_permute_free(void *arg)
+{
+ struct cmd_permute_item *i = arg;
+ XFREE(MTYPE_TMP, i->cmd);
+ XFREE(MTYPE_TMP, i);
+}
+
+static int cmd_permute_cmp(void *a, void *b)
+{
+ struct cmd_permute_item *aa = a, *bb = b;
+ return strcmp(aa->cmd, bb->cmd);
+}
+
+static void cmd_graph_permute(struct list *out, struct graph_node **stack,
+ size_t stackpos, char *cmd)
+{
+ struct graph_node *gn = stack[stackpos];
+ struct cmd_token *tok = gn->data;
+ char *appendp = cmd + strlen(cmd);
+ size_t j;
+
+ if (tok->type < SPECIAL_TKN) {
+ sprintf(appendp, "%s ", tok->text);
+ appendp += strlen(appendp);
+ } else if (tok->type == END_TKN) {
+ struct cmd_permute_item *i = XMALLOC(MTYPE_TMP, sizeof(*i));
+ i->el = ((struct graph_node *)vector_slot(gn->to, 0))->data;
+ i->cmd = XSTRDUP(MTYPE_TMP, cmd);
+ i->cmd[strlen(cmd) - 1] = '\0';
+ listnode_add_sort(out, i);
+ return;
+ }
+
+ if (++stackpos == CMD_ARGC_MAX)
+ return;
+
+ for (size_t i = 0; i < vector_active(gn->to); i++) {
+ struct graph_node *gnext = vector_slot(gn->to, i);
+ for (j = 0; j < stackpos; j++)
+ if (stack[j] == gnext)
+ break;
+ if (j != stackpos)
+ continue;
+
+ stack[stackpos] = gnext;
+ *appendp = '\0';
+ cmd_graph_permute(out, stack, stackpos, cmd);
+ }
+}
+
+static struct list *cmd_graph_permutations(struct graph *graph)
+{
+ char accumulate[2048] = "";
+ struct graph_node *stack[CMD_ARGC_MAX];
+
+ struct list *rv = list_new();
+ rv->cmp = cmd_permute_cmp;
+ rv->del = cmd_permute_free;
+ stack[0] = vector_slot(graph->nodes, 0);
+ cmd_graph_permute(rv, stack, 0, accumulate);
+ return rv;
+}
+
+extern vector cmdvec;
+
+DEFUN (grammar_findambig,
+ grammar_findambig_cmd,
+ "grammar find-ambiguous [{printall|nodescan}]",
+ GRAMMAR_STR
+ "Find ambiguous commands\n"
+ "Print all permutations\n"
+ "Scan all nodes\n")
+{
+ struct list *commands;
+ struct cmd_permute_item *prev = NULL, *cur = NULL;
+ struct listnode *ln;
+ int i, printall, scan, scannode = 0;
+ int ambig = 0;
+
+ i = 0;
+ printall = argv_find(argv, argc, "printall", &i);
+ i = 0;
+ scan = argv_find(argv, argc, "nodescan", &i);
+
+ if (scan && nodegraph_free) {
+ graph_delete_graph(nodegraph_free);
+ nodegraph_free = NULL;
+ }
+
+ if (!scan && !nodegraph) {
+ vty_out(vty, "nodegraph uninitialized\r\n");
+ return CMD_WARNING_CONFIG_FAILED;
+ }
+
+ do {
+ if (scan) {
+ struct cmd_node *cnode =
+ vector_slot(cmdvec, scannode++);
+ if (!cnode)
+ continue;
+ cmd_finalize_node(cnode);
+ nodegraph = cnode->cmdgraph;
+ if (!nodegraph)
+ continue;
+ vty_out(vty, "scanning node %d (%s)\n", scannode - 1,
+ cnode->name);
+ }
+
+ commands = cmd_graph_permutations(nodegraph);
+ prev = NULL;
+ for (ALL_LIST_ELEMENTS_RO(commands, ln, cur)) {
+ int same = prev && !strcmp(prev->cmd, cur->cmd);
+ if (printall && !same)
+ vty_out(vty, "'%s' [%x]\n", cur->cmd,
+ cur->el->daemon);
+ if (same) {
+ vty_out(vty, "'%s' AMBIGUOUS:\n", cur->cmd);
+ vty_out(vty, " %s\n '%s'\n", prev->el->name,
+ prev->el->string);
+ vty_out(vty, " %s\n '%s'\n", cur->el->name,
+ cur->el->string);
+ vty_out(vty, "\n");
+ ambig++;
+ }
+ prev = cur;
+ }
+ list_delete(&commands);
+
+ vty_out(vty, "\n");
+ } while (scan && scannode < LINK_PARAMS_NODE);
+
+ vty_out(vty, "%d ambiguous commands found.\n", ambig);
+
+ if (scan)
+ nodegraph = NULL;
+ return ambig == 0 ? CMD_SUCCESS : CMD_WARNING_CONFIG_FAILED;
+}
+
+DEFUN (grammar_init_graph,
+ grammar_init_graph_cmd,
+ "grammar init",
+ GRAMMAR_STR
+ "(re)initialize graph\n")
+{
+ if (nodegraph_free)
+ graph_delete_graph(nodegraph_free);
+ nodegraph_free = NULL;
+
+ init_cmdgraph(vty, &nodegraph);
+ return CMD_SUCCESS;
+}
+
+DEFUN (grammar_access,
+ grammar_access_cmd,
+ "grammar access (0-65535)",
+ GRAMMAR_STR
+ "access node graph\n"
+ "node number\n")
+{
+ if (nodegraph_free)
+ graph_delete_graph(nodegraph_free);
+ nodegraph_free = NULL;
+
+ struct cmd_node *cnode;
+
+ cnode = vector_slot(cmdvec, atoi(argv[2]->arg));
+ if (!cnode) {
+ vty_out(vty, "%% no such node\n");
+ return CMD_WARNING_CONFIG_FAILED;
+ }
+
+ vty_out(vty, "node %d\n", (int)cnode->node);
+ cmd_finalize_node(cnode);
+ nodegraph = cnode->cmdgraph;
+ return CMD_SUCCESS;
+}
+
+/* this is called in vtysh.c to set up the testing shim */
+void grammar_sandbox_init(void)
+{
+ // install all enable elements
+ install_element(ENABLE_NODE, &grammar_test_cmd);
+ install_element(ENABLE_NODE, &grammar_test_show_cmd);
+ install_element(ENABLE_NODE, &grammar_test_dot_cmd);
+ install_element(ENABLE_NODE, &grammar_test_match_cmd);
+ install_element(ENABLE_NODE, &grammar_test_complete_cmd);
+ install_element(ENABLE_NODE, &grammar_test_doc_cmd);
+ install_element(ENABLE_NODE, &grammar_findambig_cmd);
+ install_element(ENABLE_NODE, &grammar_init_graph_cmd);
+ install_element(ENABLE_NODE, &grammar_access_cmd);
+}
+
+/**
+ * Pretty-prints a graph, assuming it is a tree.
+ *
+ * @param start the node to take as the root
+ * @param level indent level for recursive calls, always pass 0
+ */
+static void pretty_print_graph(struct vty *vty, struct graph_node *start,
+ int level, int desc, struct graph_node **stack,
+ size_t stackpos)
+{
+ // print this node
+ char tokennum[32];
+ struct cmd_token *tok = start->data;
+
+ snprintf(tokennum, sizeof(tokennum), "%d?", tok->type);
+ vty_out(vty, "%s", lookup_msg(tokennames, tok->type, NULL));
+ if (tok->text)
+ vty_out(vty, ":\"%s\"", tok->text);
+ if (tok->varname)
+ vty_out(vty, " => %s", tok->varname);
+ if (desc)
+ vty_out(vty, " ?'%s'", tok->desc);
+ vty_out(vty, " ");
+
+ if (stackpos == CMD_ARGC_MAX) {
+ vty_out(vty, " -aborting! (depth limit)\n");
+ return;
+ }
+ stack[stackpos++] = start;
+
+ int numto = desc ? 2 : vector_active(start->to);
+ if (numto) {
+ if (numto > 1)
+ vty_out(vty, "\n");
+ for (unsigned int i = 0; i < vector_active(start->to); i++) {
+ struct graph_node *adj = vector_slot(start->to, i);
+ // if we're listing multiple children, indent!
+ if (numto > 1)
+ for (int j = 0; j < level + 1; j++)
+ vty_out(vty, " ");
+ // if this node is a vararg, just print *
+ if (adj == start)
+ vty_out(vty, "*");
+ else if (((struct cmd_token *)adj->data)->type
+ == END_TKN)
+ vty_out(vty, "--END\n");
+ else {
+ size_t k;
+ for (k = 0; k < stackpos; k++)
+ if (stack[k] == adj) {
+ vty_out(vty, "<<loop@%zu \n",
+ k);
+ break;
+ }
+ if (k == stackpos)
+ pretty_print_graph(
+ vty, adj,
+ numto > 1 ? level + 1 : level,
+ desc, stack, stackpos);
+ }
+ }
+ } else
+ vty_out(vty, "\n");
+}
+
+/** stuff that should go in command.c + command.h */
+static void init_cmdgraph(struct vty *vty, struct graph **graph)
+{
+ // initialize graph, add start noe
+ *graph = graph_new();
+ nodegraph_free = *graph;
+ struct cmd_token *token = cmd_token_new(START_TKN, 0, NULL, NULL);
+ graph_new_node(*graph, token, (void (*)(void *)) & cmd_token_del);
+ if (vty)
+ vty_out(vty, "initialized graph\n");
+}
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