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2 * Input matching routines for CLI backend.
5 * Copyright (C) 2016 Cumulus Networks, Inc.
7 * This file is part of GNU Zebra.
9 * GNU Zebra is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2, or (at your option) any
14 * GNU Zebra is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; see the file COPYING; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 #ifndef _ZEBRA_COMMAND_MATCH_H
25 #define _ZEBRA_COMMAND_MATCH_H
35 /* These definitions exist in command.c in the current engine but should be
36 * relocated here in the new engine
38 enum cmd_filter_type
{ FILTER_RELAXED
, FILTER_STRICT
};
40 /* matcher result value */
48 /* completion match types */
50 trivial_match
, // the input is null
51 no_match
, // the input does not match
52 partly_match
, // the input matches but is incomplete
53 exact_match
// the input matches and is complete
56 /* Defines which matcher_rv values constitute an error. Should be used with
57 * matcher_rv return values to do basic error checking.
59 #define MATCHER_ERROR(matcher_rv) \
60 ((matcher_rv) == MATCHER_INCOMPLETE \
61 || (matcher_rv) == MATCHER_NO_MATCH \
62 || (matcher_rv) == MATCHER_AMBIGUOUS)
65 * Attempt to find an exact command match for a line of user input.
67 * @param[in] cmdgraph command graph to match against
68 * @param[in] vline vectorized input string
69 * @param[out] argv pointer to argument list if successful match, NULL
70 * otherwise. The elements of this list are pointers to struct cmd_token
71 * and represent the sequence of tokens matched by the inpu. The ->arg
72 * field of each token points to a copy of the input matched on it. These
73 * may be safely deleted or modified.
74 * @param[out] element pointer to matched cmd_element if successful match,
75 * or NULL when MATCHER_ERROR(rv) is true. The cmd_element may *not* be
76 * safely deleted or modified; it is the instance initialized on startup.
77 * @return matcher status
79 enum matcher_rv
command_match(struct graph
*cmdgraph
, vector vline
,
81 const struct cmd_element
**element
);
84 * Compiles possible completions for a given line of user input.
86 * @param[in] start the start node of the DFA to match against
87 * @param[in] vline vectorized input string
88 * @param[out] completions pointer to list of cmd_token representing
89 * acceptable next inputs, or NULL when MATCHER_ERROR(rv) is true.
90 * The elements of this list are pointers to struct cmd_token and take on a
91 * variety of forms depending on the passed vline. If the last element in vline
92 * is NULL, all previous elements are considered to be complete words (the case
93 * when a space is the last token of the line) and completions are generated
94 * based on what could follow that input. If the last element in vline is not
95 * NULL and each sequential element matches the corresponding tokens of one or
96 * more commands exactly (e.g. 'encapv4' and not 'en') the same result is
97 * generated. If the last element is not NULL and the best possible match is a
98 * partial match, then the result generated will be all possible continuations
99 * of that element (e.g. 'encapv4', 'encapv6', etc for input 'en').
100 * @return matcher status
102 enum matcher_rv
command_complete(struct graph
*cmdgraph
, vector vline
,
103 struct list
**completions
);
109 #endif /* _ZEBRA_COMMAND_MATCH_H */