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<?php
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/***********************************************************************
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Copyright (C) 2002-2005 Rickard Andersson (rickard@punbb.org)
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This file is part of PunBB.
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PunBB is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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PunBB is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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MA 02111-1307 USA
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************************************************************************/
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// The contents of this file are very much inspired by the file functions_search.php
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// from the phpBB Group forum software phpBB2 (http://www.phpbb.com).
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// Make sure no one attempts to run this script "directly"
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if (!defined('PUN'))
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exit;
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//
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// "Cleans up" a text string and returns an array of unique words
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// This function depends on the current locale setting
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//
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function split_words($text)
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{
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global $pun_user;
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static $noise_match, $noise_replace, $stopwords;
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if (empty($noise_match))
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{
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$noise_match = array('[quote', '[code', '[url', '[img', '[email', '[color', '[colour', 'quote]', 'code]', 'url]', 'img]', 'email]', 'color]', 'colour]', '^', '$', '&', '(', ')', '<', '>', '`', '\'', '"', '|', ',', '@', '_', '?', '%', '~', '+', '[', ']', '{', '}', ':', '\\', '/', '=', '#', ';', '!', '*');
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$noise_replace = array('', '', '', '', '', '', '', '', '', '', '', '', '', '', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '', '', ' ', ' ', ' ', ' ', '', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '' , ' ', ' ', ' ', ' ', ' ', ' ');
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$stopwords = (array)@file(PUN_ROOT.'lang/'.$pun_user['language'].'/stopwords.txt');
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$stopwords = array_map('trim', $stopwords);
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}
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// Clean up
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$patterns[] = '#&[\#a-z0-9]+?;#i';
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$patterns[] = '#\b[\w]+:\/\/[a-z0-9\.\-]+(\/[a-z0-9\?\.%_\-\+=&\/~]+)?#';
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$patterns[] = '#\[\/?[a-z\*=\+\-]+(\:?[0-9a-z]+)?:[a-z0-9]{10,}(\:[a-z0-9]+)?=?.*?\]#';
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$text = preg_replace($patterns, ' ', ' '.strtolower($text).' ');
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// Filter out junk
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$text = str_replace($noise_match, $noise_replace, $text);
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// Strip out extra whitespace between words
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$text = trim(preg_replace('#\s+#', ' ', $text));
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// Fill an array with all the words
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$words = explode(' ', $text);
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if (!empty($words))
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{
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while (list($i, $word) = @each($words))
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{
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$words[$i] = trim($word, '.');
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$num_chars = pun_strlen($word);
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if ($num_chars < 3 || $num_chars > 20 || in_array($word, $stopwords))
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unset($words[$i]);
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}
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}
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return array_unique($words);
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}
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//
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// Updates the search index with the contents of $post_id (and $subject)
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//
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function update_search_index($mode, $post_id, $message, $subject = null)
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{
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global $db_type, $db;
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// Split old and new post/subject to obtain array of 'words'
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$words_message = split_words($message);
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$words_subject = ($subject) ? split_words($subject) : array();
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if ($mode == 'edit')
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{
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$result = $db->query('SELECT w.id, w.word, m.subject_match FROM '.$db->prefix.'search_words AS w INNER JOIN '.$db->prefix.'search_matches AS m ON w.id=m.word_id WHERE m.post_id='.$post_id, true) or error('Unable to fetch search index words', __FILE__, __LINE__, $db->error());
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// Declare here to stop array_keys() and array_diff() from complaining if not set
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$cur_words['post'] = array();
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$cur_words['subject'] = array();
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while ($row = $db->fetch_row($result))
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{
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$match_in = ($row[2]) ? 'subject' : 'post';
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$cur_words[$match_in][$row[1]] = $row[0];
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}
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$db->free_result($result);
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$words['add']['post'] = array_diff($words_message, array_keys($cur_words['post']));
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$words['add']['subject'] = array_diff($words_subject, array_keys($cur_words['subject']));
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$words['del']['post'] = array_diff(array_keys($cur_words['post']), $words_message);
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$words['del']['subject'] = array_diff(array_keys($cur_words['subject']), $words_subject);
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}
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else
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{
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$words['add']['post'] = $words_message;
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$words['add']['subject'] = $words_subject;
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$words['del']['post'] = array();
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$words['del']['subject'] = array();
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}
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unset($words_message);
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unset($words_subject);
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// Get unique words from the above arrays
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$unique_words = array_unique(array_merge($words['add']['post'], $words['add']['subject']));
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if (!empty($unique_words))
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{
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$result = $db->query('SELECT id, word FROM '.$db->prefix.'search_words WHERE word IN('.implode(',', preg_replace('#^(.*)$#', '\'\1\'', $unique_words)).')', true) or error('Unable to fetch search index words', __FILE__, __LINE__, $db->error());
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$word_ids = array();
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while ($row = $db->fetch_row($result))
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$word_ids[$row[1]] = $row[0];
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$db->free_result($result);
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$new_words = array_diff($unique_words, array_keys($word_ids));
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unset($unique_words);
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if (!empty($new_words))
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{
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switch ($db_type)
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{
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case 'mysql':
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case 'mysqli':
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$db->query('INSERT INTO '.$db->prefix.'search_words (word) VALUES'.implode(',', preg_replace('#^(.*)$#', '(\'\1\')', $new_words))) or error('Unable to insert search index words', __FILE__, __LINE__, $db->error());
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break;
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default:
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while (list(, $word) = @each($new_words))
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$db->query('INSERT INTO '.$db->prefix.'search_words (word) VALUES(\''.$word.'\')') or error('Unable to insert search index words', __FILE__, __LINE__, $db->error());
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break;
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}
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}
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unset($new_words);
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}
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// Delete matches (only if editing a post)
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while (list($match_in, $wordlist) = @each($words['del']))
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{
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$subject_match = ($match_in == 'subject') ? 1 : 0;
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if (!empty($wordlist))
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{
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$sql = '';
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while (list(, $word) = @each($wordlist))
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$sql .= (($sql != '') ? ',' : '').$cur_words[$match_in][$word];
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$db->query('DELETE FROM '.$db->prefix.'search_matches WHERE word_id IN('.$sql.') AND post_id='.$post_id.' AND subject_match='.$subject_match) or error('Unable to delete search index word matches', __FILE__, __LINE__, $db->error());
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}
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}
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// Add new matches
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while (list($match_in, $wordlist) = @each($words['add']))
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{
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$subject_match = ($match_in == 'subject') ? 1 : 0;
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if (!empty($wordlist))
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$db->query('INSERT INTO '.$db->prefix.'search_matches (post_id, word_id, subject_match) SELECT '.$post_id.', id, '.$subject_match.' FROM '.$db->prefix.'search_words WHERE word IN('.implode(',', preg_replace('#^(.*)$#', '\'\1\'', $wordlist)).')') or error('Unable to insert search index word matches', __FILE__, __LINE__, $db->error());
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}
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unset($words);
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}
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//
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// Strip search index of indexed words in $post_ids
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//
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function strip_search_index($post_ids)
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{
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global $db_type, $db;
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switch ($db_type)
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{
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case 'mysql':
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case 'mysqli':
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{
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$result = $db->query('SELECT word_id FROM '.$db->prefix.'search_matches WHERE post_id IN('.$post_ids.') GROUP BY word_id') or error('Unable to fetch search index word match', __FILE__, __LINE__, $db->error());
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if ($db->num_rows($result))
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{
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$word_ids = '';
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while ($row = $db->fetch_row($result))
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$word_ids .= ($word_ids != '') ? ','.$row[0] : $row[0];
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$result = $db->query('SELECT word_id FROM '.$db->prefix.'search_matches WHERE word_id IN('.$word_ids.') GROUP BY word_id HAVING COUNT(word_id)=1') or error('Unable to fetch search index word match', __FILE__, __LINE__, $db->error());
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if ($db->num_rows($result))
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{
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$word_ids = '';
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while ($row = $db->fetch_row($result))
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$word_ids .= ($word_ids != '') ? ','.$row[0] : $row[0];
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$db->query('DELETE FROM '.$db->prefix.'search_words WHERE id IN('.$word_ids.')') or error('Unable to delete search index word', __FILE__, __LINE__, $db->error());
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}
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}
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break;
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}
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default:
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$db->query('DELETE FROM '.$db->prefix.'search_words WHERE id IN(SELECT word_id FROM '.$db->prefix.'search_matches WHERE word_id IN(SELECT word_id FROM '.$db->prefix.'search_matches WHERE post_id IN('.$post_ids.') GROUP BY word_id) GROUP BY word_id HAVING COUNT(word_id)=1)') or error('Unable to delete from search index', __FILE__, __LINE__, $db->error());
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break;
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}
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$db->query('DELETE FROM '.$db->prefix.'search_matches WHERE post_id IN('.$post_ids.')') or error('Unable to delete search index word match', __FILE__, __LINE__, $db->error());
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}
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