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SearchAPI-Fulltext.class.php
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SearchAPI-Fulltext.class.php
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<?php
/**
* @name ElkArte Forum
* @copyright ElkArte Forum contributors
* @license BSD http://opensource.org/licenses/BSD-3-Clause
*
* This software is a derived product, based on:
*
* Simple Machines Forum (SMF)
* copyright: 2011 Simple Machines (http://www.simplemachines.org)
* license: BSD, See included LICENSE.TXT for terms and conditions.
*
* @version 1.0 Alpha
*
*/
if (!defined('ELK'))
die('No access...');
/**
* SearchAPI-Fulltext.class.php, Fulltext API, used when an SQL fulltext index is used
*/
class Fulltext_Search
{
/**
* This is the last version of ElkArte that this was tested on, to protect against API changes.
* @var string
*/
public $version_compatible = 'ElkArte 1.0 Alpha';
/**
* This won't work with versions of ElkArte less than this.
* @var string
*/
public $min_elk_version = 'ElkArte 1.0 Alpha';
/**
* Is it supported?
*
* @var boolean
*/
public $is_supported = true;
/**
* What words are banned?
* @var array
*/
protected $bannedWords = array();
/**
* What is the minimum word length?
* @var int
*/
protected $min_word_length = 4;
/**
* What databases support the fulltext index?
* @var array
*/
protected $supported_databases = array('mysql');
/**
* Fulltext_Search::__construct()
*
*/
public function __construct()
{
global $modSettings, $db_type;
// Is this database supported?
if (!in_array($db_type, $this->supported_databases))
{
$this->is_supported = false;
return;
}
$this->bannedWords = empty($modSettings['search_banned_words']) ? array() : explode(',', $modSettings['search_banned_words']);
$this->min_word_length = $this->_getMinWordLength();
}
/**
* Fulltext_Search::supportsMethod()
*
* Check whether the method can be performed by this API.
*
* @param mixed $methodName
* @param mixed $query_params
* @return
*/
public function supportsMethod($methodName, $query_params = null)
{
switch ($methodName)
{
case 'searchSort':
case 'prepareIndexes':
case 'indexedWordQuery':
return true;
break;
// All other methods, too bad dunno you.
default:
return false;
break;
}
}
/**
* Fulltext_Search::_getMinWordLength()
*
* What is the minimum word length full text supports?
*
* @return
*/
protected function _getMinWordLength()
{
$db = database();
// need some search specific database tricks
$db_search = db_search();
// Try to determine the minimum number of letters for a fulltext search.
$request = $db_search->search_query('max_fulltext_length', '
SHOW VARIABLES
LIKE {string:fulltext_minimum_word_length}',
array(
'fulltext_minimum_word_length' => 'ft_min_word_len',
)
);
if ($request !== false && $db->num_rows($request) == 1)
{
list (, $min_word_length) = $db->fetch_row($request);
$db->free_result($request);
}
// 4 is the MySQL default...
else
$min_word_length = 4;
return $min_word_length;
}
/**
* callback function for usort used to sort the fulltext results.
* the order of sorting is: large words, small words, large words that
* are excluded from the search, small words that are excluded.
*
* @param string $a Word A
* @param string $b Word B
* @return int
*/
public function searchSort($a, $b)
{
global $excludedWords;
$x = Util::strlen($a) - (in_array($a, $excludedWords) ? 1000 : 0);
$y = Util::strlen($b) - (in_array($b, $excludedWords) ? 1000 : 0);
return $x < $y ? 1 : ($x > $y ? -1 : 0);
}
/**
* Fulltext_Search::prepareIndexes()
*
* Do we have to do some work with the words we are searching for to prepare them?
*
* @param mixed $word
* @param mixed $wordsSearch
* @param mixed $wordsExclude
* @param mixed $isExcluded
* @return
*/
public function prepareIndexes($word, &$wordsSearch, &$wordsExclude, $isExcluded)
{
global $modSettings;
$subwords = text2words($word, null, false);
if (empty($modSettings['search_force_index']))
{
// A boolean capable search engine and not forced to only use an index, we may use a non indexed search
// this is harder on the server so we are restrictive here
if (count($subwords) > 1 && preg_match('~[.:@$]~', $word))
{
// using special characters that a full index would ignore and the remaining words are short which would also be ignored
if ((Util::strlen(current($subwords)) < $this->min_word_length) && (Util::strlen(next($subwords)) < $this->min_word_length))
{
$wordsSearch['words'][] = trim($word, "/*- ");
$wordsSearch['complex_words'][] = count($subwords) === 1 ? $word : '"' . $word . '"';
}
}
elseif (Util::strlen(trim($word, "/*- ")) < $this->min_word_length)
{
// short words have feelings too
$wordsSearch['words'][] = trim($word, "/*- ");
$wordsSearch['complex_words'][] = count($subwords) === 1 ? $word : '"' . $word . '"';
}
}
$fulltextWord = count($subwords) === 1 ? $word : '"' . $word . '"';
$wordsSearch['indexed_words'][] = $fulltextWord;
if ($isExcluded)
$wordsExclude[] = $fulltextWord;
}
/**
* Fulltext_Search::indexedWordQuery()
*
* Search for indexed words.
*
* @param mixed $words
* @param mixed $search_data
* @return
*/
public function indexedWordQuery($words, $search_data)
{
global $modSettings;
$db = database();
$db_search = db_search();
$query_select = array(
'id_msg' => 'm.id_msg',
);
$query_where = array();
$query_params = $search_data['params'];
if ($query_params['id_search'])
$query_select['id_search'] = '{int:id_search}';
$count = 0;
if (empty($modSettings['search_simple_fulltext']))
foreach ($words['words'] as $regularWord)
{
$query_where[] = 'm.body' . (in_array($regularWord, $query_params['excluded_words']) ? ' NOT' : '') . (empty($modSettings['search_match_words']) || $search_data['no_regexp'] ? ' LIKE ' : 'RLIKE') . '{string:complex_body_' . $count . '}';
$query_params['complex_body_' . $count++] = empty($modSettings['search_match_words']) || $search_data['no_regexp'] ? '%' . strtr($regularWord, array('_' => '\\_', '%' => '\\%')) . '%' : '[[:<:]]' . addcslashes(preg_replace(array('/([\[\]$.+*?|{}()])/'), array('[$1]'), $regularWord), '\\\'') . '[[:>:]]';
}
if ($query_params['user_query'])
$query_where[] = '{raw:user_query}';
if ($query_params['board_query'])
$query_where[] = 'm.id_board {raw:board_query}';
if ($query_params['topic'])
$query_where[] = 'm.id_topic = {int:topic}';
if ($query_params['min_msg_id'])
$query_where[] = 'm.id_msg >= {int:min_msg_id}';
if ($query_params['max_msg_id'])
$query_where[] = 'm.id_msg <= {int:max_msg_id}';
$count = 0;
if (!empty($query_params['excluded_phrases']) && empty($modSettings['search_force_index']))
foreach ($query_params['excluded_phrases'] as $phrase)
{
$query_where[] = 'subject NOT ' . (empty($modSettings['search_match_words']) || $search_data['no_regexp'] ? ' LIKE ' : 'RLIKE') . '{string:exclude_subject_phrase_' . $count . '}';
$query_params['exclude_subject_phrase_' . $count++] = empty($modSettings['search_match_words']) || $search_data['no_regexp'] ? '%' . strtr($phrase, array('_' => '\\_', '%' => '\\%')) . '%' : '[[:<:]]' . addcslashes(preg_replace(array('/([\[\]$.+*?|{}()])/'), array('[$1]'), $phrase), '\\\'') . '[[:>:]]';
}
$count = 0;
if (!empty($query_params['excluded_subject_words']) && empty($modSettings['search_force_index']))
foreach ($query_params['excluded_subject_words'] as $excludedWord)
{
$query_where[] = 'subject NOT ' . (empty($modSettings['search_match_words']) || $search_data['no_regexp'] ? ' LIKE ' : 'RLIKE') . '{string:exclude_subject_words_' . $count . '}';
$query_params['exclude_subject_words_' . $count++] = empty($modSettings['search_match_words']) || $search_data['no_regexp'] ? '%' . strtr($excludedWord, array('_' => '\\_', '%' => '\\%')) . '%' : '[[:<:]]' . addcslashes(preg_replace(array('/([\[\]$.+*?|{}()])/'), array('[$1]'), $excludedWord), '\\\'') . '[[:>:]]';
}
if (!empty($modSettings['search_simple_fulltext']))
{
$query_where[] = 'MATCH (body) AGAINST ({string:body_match})';
$query_params['body_match'] = implode(' ', array_diff($words['indexed_words'], $query_params['excluded_index_words']));
}
else
{
$query_params['boolean_match'] = '';
// remove any indexed words that are used in the complex body search terms
$words['indexed_words'] = array_diff($words['indexed_words'], $words['complex_words']);
foreach ($words['indexed_words'] as $fulltextWord)
$query_params['boolean_match'] .= (in_array($fulltextWord, $query_params['excluded_index_words']) ? '-' : '+') . $fulltextWord . ' ';
$query_params['boolean_match'] = substr($query_params['boolean_match'], 0, -1);
// if we have bool terms to search, add them in
if ($query_params['boolean_match'])
$query_where[] = 'MATCH (body) AGAINST ({string:boolean_match} IN BOOLEAN MODE)';
}
$ignoreRequest = $db_search->search_query('insert_into_log_messages_fulltext', ($db->support_ignore() ? ( '
INSERT IGNORE INTO {db_prefix}' . $search_data['insert_into'] . '
(' . implode(', ', array_keys($query_select)) . ')') : '') . '
SELECT ' . implode(', ', $query_select) . '
FROM {db_prefix}messages AS m
WHERE ' . implode('
AND ', $query_where) . (empty($search_data['max_results']) ? '' : '
LIMIT ' . ($search_data['max_results'] - $search_data['indexed_results'])),
$query_params
);
return $ignoreRequest;
}
}