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/* Copyright (C) 2022 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program 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 3 of the License, or
(at your option) any later version.
This program 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. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include <histedit.h>
#include "libknot/mm_ctx.h"
#include "contrib/qp-trie/trie.h"
/*! Lookup context. */
typedef struct {
/*! Memory pool context. */
knot_mm_t mm;
/*! Main trie storage. */
trie_t *trie;
/*! Current (iteration) data context. */
struct {
/*! Stored key. */
char *key;
/*! Corresponding key data. */
void *data;
} found;
/*! Iteration context. */
struct {
/*! Total number of possibilities. */
size_t count;
/*! The first possibility. */
char *first_key;
/*! Hat-trie iterator. */
trie_it_t *it;
} iter;
} lookup_t;
/*!
* Initializes the lookup context.
*
* \param[in] lookup Lookup context.
*
* \return Error code, KNOT_EOK if successful.
*/
int lookup_init(lookup_t *lookup);
/*!
* Deinitializes the lookup context.
*
* \param[in] lookup Lookup context.
*/
void lookup_deinit(lookup_t *lookup);
/*!
* Inserts given key and data into the lookup.
*
* \param[in] lookup Lookup context.
* \param[in] str Textual key.
* \param[in] data Key textual data.
*
* \return Error code, KNOT_EOK if successful.
*/
int lookup_insert(lookup_t *lookup, const char *str, void *data);
/*!
* Removes given key from the lookup.
*
* \param[in] lookup Lookup context.
* \param[in] str Textual key.
*
* \return Error code, KNOT_EOK if successful.
*/
int lookup_remove(lookup_t *lookup, const char *str);
/*!
* Searches the lookup container for the given key.
*
* \note If one candidate, lookup.found contains the key/data,
* if more candidates, lookup.found contains the common key prefix and
* lookup.iter.first_key is the first candidate key.
*
* \param[in] lookup Lookup context.
* \param[in] str Textual key.
* \param[in] str_len Textual key length.
*
* \return Error code, KNOT_EOK if 1 candidate, KNOT_ENOENT if no candidate,
* and KNOT_EFEWDATA if more candidates are possible.
*/
int lookup_search(lookup_t *lookup, const char *str, size_t str_len);
/*!
* Moves the lookup iterator to the next key candidate.
*
* \note lookup.found is updated.
*
* \param[in] lookup Lookup context.
*/
void lookup_list(lookup_t *lookup);
/*!
* Completes the string based on the lookup content or prints all candidates.
*
* \param[in] lookup Lookup context.
* \param[in] str Textual key.
* \param[in] str_len Textual key length.
* \param[in] el Editline context.
* \param[in] add_space Add one space after completed string flag.
*
* \return Error code, same as lookup_search().
*/
int lookup_complete(lookup_t *lookup, const char *str, size_t str_len,
EditLine *el, bool add_space);
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