diff -r 5e1f1e916419 -r 98bbc533541c punbb/include/search_idx.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/punbb/include/search_idx.php	Sun Apr 06 00:28:50 2008 -0400
@@ -0,0 +1,231 @@
+<?php
+/***********************************************************************
+
+  Copyright (C) 2002-2008  PunBB.org
+
+  This file is part of PunBB.
+
+  PunBB 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 of the License,
+  or (at your option) any later version.
+
+  PunBB 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, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+  MA  02111-1307  USA
+
+************************************************************************/
+
+
+// The contents of this file are very much inspired by the file functions_search.php
+// from the phpBB Group forum software phpBB2 (http://www.phpbb.com). 
+
+
+// Make sure no one attempts to run this script "directly"
+if (!defined('PUN'))
+	exit;
+
+
+//
+// "Cleans up" a text string and returns an array of unique words
+// This function depends on the current locale setting
+//
+function split_words($text)
+{
+	global $pun_user;
+	static $noise_match, $noise_replace, $stopwords;
+
+	if (empty($noise_match))
+	{
+		$noise_match = 		array('[quote', '[code', '[url', '[img', '[email', '[color', '[colour', 'quote]', 'code]', 'url]', 'img]', 'email]', 'color]', 'colour]', '^', '$', '&', '(', ')', '<', '>', '`', '\'', '"', '|', ',', '@', '_', '?', '%', '~', '+', '[', ']', '{', '}', ':', '\\', '/', '=', '#', ';', '!', '*');
+		$noise_replace =	array('',       '',      '',     '',     '',       '',       '',        '',       '',      '',     '',     '',       '',       '',        ' ', ' ', ' ', ' ', ' ', ' ', ' ', '',  '',   ' ', ' ', ' ', ' ', '',  ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '' ,  ' ', ' ', ' ', ' ', ' ', ' ');
+
+		$stopwords = (array)@file(PUN_ROOT.'lang/'.$pun_user['language'].'/stopwords.txt');
+		$stopwords = array_map('trim', $stopwords);
+	}
+
+	// Clean up
+	$patterns[] = '#&[\#a-z0-9]+?;#i';
+	$patterns[] = '#\b[\w]+:\/\/[a-z0-9\.\-]+(\/[a-z0-9\?\.%_\-\+=&\/~]+)?#';
+	$patterns[] = '#\[\/?[a-z\*=\+\-]+(\:?[0-9a-z]+)?:[a-z0-9]{10,}(\:[a-z0-9]+)?=?.*?\]#';
+	$text = preg_replace($patterns, ' ', ' '.strtolower($text).' ');
+
+	// Filter out junk
+	$text = str_replace($noise_match, $noise_replace, $text);
+
+	// Strip out extra whitespace between words
+	$text = trim(preg_replace('#\s+#', ' ', $text));
+
+	// Fill an array with all the words
+	$words = explode(' ', $text);
+
+	if (!empty($words))
+	{
+		while (list($i, $word) = @each($words))
+		{
+			$words[$i] = trim($word, '.');
+			$num_chars = pun_strlen($word);
+
+			if ($num_chars < 3 || $num_chars > 20 || in_array($words[$i], $stopwords))
+				unset($words[$i]);
+		}
+	}
+
+	return array_unique($words);
+}
+
+
+//
+// Updates the search index with the contents of $post_id (and $subject)
+//
+function update_search_index($mode, $post_id, $message, $subject = null)
+{
+	global $db_type, $pun_db;
+
+	// Split old and new post/subject to obtain array of 'words'
+	$words_message = split_words($message);
+	$words_subject = ($subject) ? split_words($subject) : array();
+
+	if ($mode == 'edit')
+	{
+		$result = $pun_db->query('SELECT w.id, w.word, m.subject_match FROM '.$pun_db->prefix.'search_words AS w INNER JOIN '.$pun_db->prefix.'search_matches AS m ON w.id=m.word_id WHERE m.post_id='.$post_id, true) or error(__FILE__, __LINE__);
+
+		// Declare here to stop array_keys() and array_diff() from complaining if not set
+		$cur_words['post'] = array();
+		$cur_words['subject'] = array();
+
+		while ($row = $pun_db->fetch_row($result))
+		{
+			$match_in = ($row[2]) ? 'subject' : 'post';
+			$cur_words[$match_in][$row[1]] = $row[0];
+		}
+
+		$pun_db->free_result($result);
+
+		$words['add']['post'] = array_diff($words_message, array_keys($cur_words['post']));
+		$words['add']['subject'] = array_diff($words_subject, array_keys($cur_words['subject']));
+		$words['del']['post'] = array_diff(array_keys($cur_words['post']), $words_message);
+		$words['del']['subject'] = array_diff(array_keys($cur_words['subject']), $words_subject);
+	}
+	else
+	{
+		$words['add']['post'] = $words_message;
+		$words['add']['subject'] = $words_subject;
+		$words['del']['post'] = array();
+		$words['del']['subject'] = array();
+	}
+
+	unset($words_message);
+	unset($words_subject);
+
+	// Get unique words from the above arrays
+	$unique_words = array_unique(array_merge($words['add']['post'], $words['add']['subject']));
+
+	if (!empty($unique_words))
+	{
+		$result = $pun_db->query('SELECT id, word FROM '.$pun_db->prefix.'search_words WHERE word IN('.implode(',', preg_replace('#^(.*)$#', '\'\1\'', $unique_words)).')', true) or error(__FILE__, __LINE__);
+
+		$word_ids = array();
+		while ($row = $pun_db->fetch_row($result))
+			$word_ids[$row[1]] = $row[0];
+
+		$pun_db->free_result($result);
+
+		$new_words = array_diff($unique_words, array_keys($word_ids));
+		unset($unique_words);
+
+		if (!empty($new_words))
+		{
+			switch ($db_type)
+			{
+				case 'mysql':
+				case 'mysqli':
+					$pun_db->query('INSERT INTO '.$pun_db->prefix.'search_words (word) VALUES'.implode(',', preg_replace('#^(.*)$#', '(\'\1\')', $new_words))) or error(__FILE__, __LINE__);
+					break;
+
+				default:
+					while (list(, $word) = @each($new_words))
+						$pun_db->query('INSERT INTO '.$pun_db->prefix.'search_words (word) VALUES(\''.$word.'\')') or error(__FILE__, __LINE__);
+					break;
+			}
+		}
+
+		unset($new_words);
+	}
+
+	// Delete matches (only if editing a post)
+	while (list($match_in, $wordlist) = @each($words['del']))
+	{
+		$subject_match = ($match_in == 'subject') ? 1 : 0;
+
+		if (!empty($wordlist))
+		{
+			$sql = '';
+			while (list(, $word) = @each($wordlist))
+				$sql .= (($sql != '') ? ',' : '').$cur_words[$match_in][$word];
+
+			$pun_db->query('DELETE FROM '.$pun_db->prefix.'search_matches WHERE word_id IN('.$sql.') AND post_id='.$post_id.' AND subject_match='.$subject_match) or error(__FILE__, __LINE__);
+		}
+	}
+
+	// Add new matches
+	while (list($match_in, $wordlist) = @each($words['add']))
+	{
+		$subject_match = ($match_in == 'subject') ? 1 : 0;
+
+		if (!empty($wordlist))
+			$pun_db->query('INSERT INTO '.$pun_db->prefix.'search_matches (post_id, word_id, subject_match) SELECT '.$post_id.', id, '.$subject_match.' FROM '.$pun_db->prefix.'search_words WHERE word IN('.implode(',', preg_replace('#^(.*)$#', '\'\1\'', $wordlist)).')') or error(__FILE__, __LINE__);
+	}
+
+	unset($words);
+}
+
+
+//
+// Strip search index of indexed words in $post_ids
+//
+function strip_search_index($post_ids)
+{
+	global $db_type, $pun_db;
+
+	switch ($db_type)
+	{
+		case 'mysql':
+		case 'mysqli':
+		{
+			$result = $pun_db->query('SELECT word_id FROM '.$pun_db->prefix.'search_matches WHERE post_id IN('.$post_ids.') GROUP BY word_id') or error(__FILE__, __LINE__);
+
+			if ($pun_db->num_rows($result))
+			{
+				$word_ids = '';
+				while ($row = $pun_db->fetch_row($result))
+					$word_ids .= ($word_ids != '') ? ','.$row[0] : $row[0];
+
+				$result = $pun_db->query('SELECT word_id FROM '.$pun_db->prefix.'search_matches WHERE word_id IN('.$word_ids.') GROUP BY word_id HAVING COUNT(word_id)=1') or error(__FILE__, __LINE__);
+
+				if ($pun_db->num_rows($result))
+				{
+					$word_ids = '';
+					while ($row = $pun_db->fetch_row($result))
+						$word_ids .= ($word_ids != '') ? ','.$row[0] : $row[0];
+
+					$pun_db->query('DELETE FROM '.$pun_db->prefix.'search_words WHERE id IN('.$word_ids.')') or error(__FILE__, __LINE__);
+				}
+			}
+
+			break;
+		}
+
+		default:
+			$pun_db->query('DELETE FROM '.$pun_db->prefix.'search_words WHERE id IN(SELECT word_id FROM '.$pun_db->prefix.'search_matches WHERE word_id IN(SELECT word_id FROM '.$pun_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(__FILE__, __LINE__);
+			break;
+	}
+
+	$pun_db->query('DELETE FROM '.$pun_db->prefix.'search_matches WHERE post_id IN('.$post_ids.')') or error(__FILE__, __LINE__);
+}