<?php
if (!defined('VB_ENTRY')) die('Access denied.');
/*======================================================================*\
|| #################################################################### ||
|| # vBulletin 5.1.1 - Licence Number VBCUP51ZOY
|| # ---------------------------------------------------------------- # ||
|| # Copyright 2000-2014 vBulletin Solutions Inc. All Rights Reserved. ||
|| # This file may not be redistributed in whole or significant part. # ||
|| # ---------------- VBULLETIN IS NOT FREE SOFTWARE ---------------- # ||
|| # http://www.vbulletin.com | http://www.vbulletin.com/license.html # ||
|| #################################################################### ||
\*======================================================================*/
class vBSphinxSearch_Core extends vB_Search_Core
{
	const DEBUG = false;
	protected $sphinxDB;
	protected $table;
	protected $what = array('id');
	protected $where = array();
	protected $groupby = '';
	private static $field_map = array
	(
		'rank' => 'score',
		'relevance' => 'score',
		'author' => 'userid'
	);

	protected $attributes_definition = array
	(
		'contenttypeid'		=> 'rt_attr_uint',
		'lastcontentid'		=> 'rt_attr_uint',
		'parentid'			=> 'rt_attr_uint',
		'starter'			=> 'rt_attr_uint',
		'starterparent'		=> 'rt_attr_uint', //the starter's parent id - the channelid
		'starteruser'		=> 'rt_attr_uint', // the starter's user id
		'closure'			=> 'rt_attr_multi', // it's the list of all the node's parents and the node itself
		'depth'				=> 'rt_attr_json', // the depth of the node's each parent
		'userid'			=> 'rt_attr_uint',
		'authorname'		=> 'rt_attr_string',
		'setfor'			=> 'rt_attr_uint',
		'sentto'			=> 'rt_attr_multi', //populated from the sentto table
		'showpublished'		=> 'rt_attr_uint',
		'approved'			=> 'rt_attr_uint',
		'showapproved'		=> 'rt_attr_uint',
		'viewperms'			=> 'rt_attr_uint',
		'featured'			=> 'rt_attr_uint',
		'inlist'			=> 'rt_attr_uint',
		'protected'			=> 'rt_attr_uint',
		'votes'				=> 'rt_attr_uint',
		'lastcontent'		=> 'rt_attr_timestamp',
		'created'			=> 'rt_attr_timestamp',
		'publishdate'		=> 'rt_attr_timestamp',
		'unpublishdate'			=> 'rt_attr_timestamp',
		'prefixid'			=> 'rt_attr_string',
		'tagid'				=> 'rt_attr_multi', //populated from the tagnode table
		'textcount'			=> 'rt_attr_uint'
	);

	public function __construct()
	{
		$config = vB::getConfig();
		if (empty($config['Misc']['sphinx_host']) OR empty($config['Misc']['sphinx_port']))
		{
			throw new vB_Exception_Api('sphinx_not_configured');
		}
		$dbClass = 'vB_Database_' . ucfirst(strtolower($config['Database']['dbtype']));
		$this->sphinxDB = new $dbClass();
		$this->sphinxDB->connect('', $config['Misc']['sphinx_host'], $config['Misc']['sphinx_port'], '', '', false);
		$this->table = $config['Database']['dbname'];
	}
	/**************INDEXING**************************/

	public function indexText($node, $title, $text, $skip_prev_index = false)
	{
		$changes = $this->compute_changes($node);

		$assertor = vB::getDbAssertor();

		// no meaningful words, no index
		if ((empty($changes['existing']) OR !empty($changes['reindex'])) AND empty($title) AND empty($text))
		{
			// updating the CRC32 value so it would not be picked up by the indexer again
			$assertor->update('vBForum:node', array('CRC32' => 1), array('nodeid' => $node['nodeid']));
			return false;
		}

		if (empty($title) AND empty($text))
		{
			$crc = 1;
		}
		else
		{
			$crc = sprintf('%u', crc32($title . $text));
		}

		// check if the same content has already been indexed (update)
		if (!empty($changes['existing']) AND ($node['CRC32'] == $crc) AND empty($changes['changes']))
		{
			// no need to index if the content hasn't changed
			return false;
		}
		// text has changed, update the existing node with the new CRC
		if ($node['CRC32'] != $crc)
		{
			$assertor->update('vBForum:node', array('CRC32' => $crc), array('nodeid' => $node['nodeid']));
		}

		$values = array("'" . $this->sphinxEscapeString($title) . "'", "'" . $this->sphinxEscapeString($text) . "'");

		foreach ($this->attributes_definition as $key => $type)
		{
			$values[] = $this->quote_smart($key, isset($node[$key]) ? $node[$key] : '', false);
		}

		$query = (empty($changes['existing']) ? 'INSERT' : 'REPLACE') . " INTO " . $this->table . "(
				id, title, content, " . implode(', ', array_keys($this->attributes_definition)) . "
			) 
			VALUES (
				$node[nodeid], " . implode(', ', $values) . "
			)
		";

		$this->sphinxDB->query_write($query);

		$config = vB::getConfig();
		if (!empty($config['Misc']['debug_sql']) OR self::DEBUG)
		{
			echo "$query;\n";
		}

		if ($err = $this->sphinxDB->error())
		{
			throw new vB_Exception_Database($err);
		}

		return true;
	}

	public function reIndexAll($silent = false)
	{
		$config = vB::getConfig();
		$command = $config['Misc']['sphinx_path'] . '/bin/indexer --config ' . $config['Misc']['sphinx_config'] . 
			' --sighup-each --rotate ' . ($silent ? '--quiet ' : '') . ($this->table . '_disk');
		if ($silent)
		{
			$this->exec_command($command, $silent);
		}
		else
		{
			$this->exec_command_feedback($command, $silent);
		}
		// need to restart the service
		$this->restart($silent);
		$this->sphinxDB->query_write($query = "TRUNCATE RTINDEX " . $this->table);
		$this->sphinxDB->query_write("ATTACH INDEX " . ($this->table . '_disk') . " TO RTINDEX " . $this->table);
		vB::getDbAssertor()->update(
				'vBForum:node',
				array('CRC32' => 1),
				vB_dB_Query::CONDITION_ALL
		);
		return true;
	}

	public function attributeChanged($nodeid)
	{
		try
		{
			$node = vB_Library::instance('node')->getNodeBare($nodeid);
		}
		catch (Exception $e)
		{
			return;
		}

		$changes = $this->compute_changes($node);
		if (!empty($changes['reindex']))
		{
			return $this->index($nodeid, false);
		}

		$values = array();
		foreach ($changes['changes'] as $key => $value)
		{
			$values[] = "$key = " . $this->quote_smart($key, $value, false);
		}

		if (empty($values))
		{
			return false;
		}

		$query = "UPDATE " . $this->table . " SET " . implode(', ', $values) . " WHERE id = " . intval($nodeid);
		$this->sphinxDB->query_write($query);

		$config = vB::getConfig();
		if (!empty($config['Misc']['debug_sql']) OR self::DEBUG)
		{
			echo "$query;\n";
		}

	}

	/**************DELETING**************************/

	public function emptyIndex()
	{
		$config = vB::getConfig();
		parent::emptyIndex();
		$this->sphinxDB->query_write($query = "TRUNCATE RTINDEX " . $this->table);
		if (!empty($config['Misc']['debug_sql']) OR self::DEBUG)
		{
			echo "$query;\n";
		}
	}

	public function delete($nodeid, $node = false)
	{
		$nodeid = intval($nodeid);
		$config = vB::getConfig();
		$res = $this->sphinxDB->query($query = '
				SELECT id
				FROM ' . $this->table . "
				WHERE closure = $nodeid
				/**" . __FUNCTION__ . (defined('THIS_SCRIPT') ? '- ' . THIS_SCRIPT : '') . "**/");
		$children = array($nodeid);
		while($row = $this->sphinxDB->fetch_array($res))
		{
			$children[] = $row['id'];
		}

		$this->sphinxDB->query_write($query = "DELETE FROM " . $this->table . " WHERE id IN (" . implode(',',$children) . ")");
		if (!empty($config['Misc']['debug_sql']) OR self::DEBUG)
		{
			echo "$query;\n";
		}
	}


	public function deleteBulk($nodeids)
	{
		if (empty($nodeids))
		{
			return;
		}

		$config = vB::getConfig();
		$res = $this->sphinxDB->query($query = '
				SELECT id
				FROM ' . $this->table . "
				WHERE closure IN (" . implode(',', $nodeids) . ")
				/**" . __FUNCTION__ . (defined('THIS_SCRIPT') ? '- ' . THIS_SCRIPT : '') . "**/");
		while($row = $this->sphinxDB->fetch_array($res))
		{
			$nodeids[] = $row['id'];
		}

		$this->sphinxDB->query_write($query = "DELETE FROM " . $this->table . " WHERE id IN (" . implode(',',$nodeids) . ")");
		if (!empty($config['Misc']['debug_sql']) OR self::DEBUG)
		{
			echo "$query;\n";
		}

	}

	/**************SEARCHING**************************/

	public function getResults(vB_Search_Criteria $criteria)
	{
		$config = vB::getConfig();
		$vBDBSearch_Core = new vBDBSearch_Core();
		$keywords = $criteria->get_raw_keywords();
		// if there are no keywords, fall back to DB search
		if (empty($keywords))
		{
			return $vBDBSearch_Core->getResults($criteria);
		}

		$results = $this->getTwoPassResults($criteria);

		//getTwoPassResults will return an array of results or a string cache key
		if (is_array($results))
		{
			$nodeids = array();
			foreach ($results AS $nodeid => $node)
			{
				$nodeids[$nodeid] = $nodeid;
			}
			return $nodeids;
		}
		else
		{
			$cacheKey = $results;
		}

		$this->filters = array(
			'make_equals_filter'    => $criteria->get_equals_filters(),
			'make_notequals_filter' => $criteria->get_notequals_filters(),
			'make_range_filter'     => $criteria->get_range_filters(),
		);

		$this->process_sort($criteria);

		if (!empty($this->filters['make_equals_filter']['view']))
		{
			$this->process_view_filters($this->filters['make_equals_filter']['view']);
			unset($this->filters['make_equals_filter']['view']);
		}

		if (!empty($this->filters['make_equals_filter']['follow']))
		{
			$this->process_follow_filters($this->filters['make_equals_filter']['follow'], $criteria);
			unset($this->filters['make_equals_filter']['follow']);
		}

		//handle equals filters
		$this->process_filters($criteria, 'make_equals_filter', $cacheKey ? true : false);
		//handle notequals filters
		$this->process_filters($criteria, 'make_notequals_filter', $cacheKey ? true : false);
		//handle range filters
		$this->process_filters($criteria, 'make_range_filter', $cacheKey ? true : false);

		$this->setNodePermTerms($cacheKey ? true : false);

		$field = $criteria->is_title_only() ? '@title ' : '';
		array_unshift($this->where, "MATCH('" . $this->sphinxEscapeString($criteria->get_raw_keywords()) . "')");

		$query_limit = false;

		if(!$criteria->getNoLimit())
		{
			$maxresults = vB::getDatastore()->getOption('maxresults');
			$maxresults = ($maxresults > 0) ? $maxresults : 0;
			if (!empty($maxresults))
			{
				$query_limit = "LIMIT " . $maxresults;
			}
		}

		$groupby = '';
		if (!empty($this->groupby))
		{
			$groupby = '
				GROUP BY ' . $this->groupby;
		}

		$query = '
			SELECT ' . implode(', ', $this->what) . '
			FROM ' . $this->table . '
			WHERE ' . implode(' AND ', $this->where) . $groupby . '
			ORDER BY ' . implode(', ', $this->sort) . "
				$query_limit
			/**" . __FUNCTION__ . (defined('THIS_SCRIPT') ? '- ' . THIS_SCRIPT : '') . "
				" . print_r($criteria->getJSON(), true) . "**/";

		$res = $this->sphinxDB->query($query);

		if (!empty($config['Misc']['debug_sql']) OR self::DEBUG)
		{
			echo "$query;\n";
		}

		if ($cacheKey)
		{
			$this->what[] = 'starteruser';
			$this->what[] = 'starterparent';
		}

		$results = array();
		$nodeids = array();
		while($row = $this->sphinxDB->fetch_array($res))
		{
			$value = current($row);
			$nodeids[$value] = $value;
			if ($cacheKey)
			{
				$results[$value] = array(
					'nodeid'   => $value,
					'parentid' => $row['starterparent'],
					'userid'   => $row['starteruser']
				);
			}
		}
		if (empty($nodeids))
		{
			return array();
		}

		$post_processors = $criteria->get_post_processors();
		if (empty($post_processors))
		{
			if ($cacheKey)
			{
				$nodeids = array();
				$results = vB_Search_Core::saveSecondPassResults($results, $cacheKey);
				foreach ($results AS $nodeid => $node)
				{
					$nodeids[$nodeid] = $nodeid;
				}
			}
		}
		else
		{
			foreach ($post_processors as $post_processor)
			{
				$vBSphinxSearch_Core = new vBSphinxSearch_Core();
				$nodeids = $vBSphinxSearch_Core->$post_processor($nodeids, $criteria);
			}

			if (empty($nodeids))
			{
				return array();
			}
			$criteria->reset_post_processors();
		}
		return $nodeids;
	}

	/**
	 *	Handle processing for the equals / range filters
	 * @param object $criteria vB_Search_Criteria
	 * @param array $filter_method string The name of the method to call to create a
	 *		where snippet for this kind of filter (currently equals and range -- not planning
	 *		to add more).  This should be the name of a private method on this class.
	 * @param  bool $excludeUserSpecific Exclude user specific queries. Used for precaching
	 */
	private function process_filters(vB_Search_Criteria &$criteria, $filter_method, $excludeUserSpecific = false)
	{
		foreach ($this->filters[$filter_method] as $field => $value)
		{
			switch ($field)
			{
				//if this is a null filter we that forces a 0-result query
				case 'null':
					$this->where[] = "id = 0 /** " . $this->sphinxEscapeString(str_replace(array('*', '/', '\\'), ' ', $value)). " **/";
					break;
				case 'tag':
					$this->process_tag_filters($value);
					break;
				case 'channelid':
					$this->process_channel_filters($value, $criteria->getDepth(), $criteria->getIncludeStarter(), $criteria->getDepthExact(), $excludeUserSpecific);
					break;
				case 'exclude':
					$this->process_exclude_filters($value);
					break;
				case 'follow':
					$this->process_follow_filters($value, $criteria);
					break;
				case 'unpublishdate':
					$this->where[] = "(node.showpublished = 1)";
					break;
				case 'publishdate':
					// skip adding a date restriction, workaround for activity stream
					if ($value != 'all')
					{
						$this->where[] = $this->$filter_method('publishdate', $value);
					}
					break;
				case 'starter_only':
					$this->process_starter_only_filter($value);
					break;
				case 'reply_only':
					$this->process_reply_only_filter($value);
					break;
				case 'comment_only':
					$this->process_comment_only_filter($value);
					break;
				case 'include_visitor_messages':
					$this->process_visitor_message_filter($value, 'include');
					break;
				case 'visitor_messages_only':
					$this->process_visitor_message_filter($value, 'only');
					break;
				case 'sentto':
					$this->process_visitor_message_filter($value, 'for');
					break;
				case 'exclude_visitor_messages':
					$this->process_visitor_message_filter($value, 'exclude');
					break;
				case 'include_private_messages':
					$this->process_private_message_filter($value, 'include');
					break;
				case 'private_messages_only':
					$this->process_private_message_filter($value, 'only');
					break;
/** @todo OR operator is not supported by sphinx*/
 				case 'OR':
// 					foreach ($value as $fld => $val)
// 					{
// 						$fld = $this->sphinxDB->clean_identifier($fld);
// 						$qbits[] = $this->make_equals_filter($fld, $val);
// 					}
// 					$this->where[''] = "(" . implode(' OR ', $qbits) . ")";
 					break;
				case 'marked':
					$this->process_marked_filter($value);
					break;
				default:
					$dbfield = $field;
					if (isset(self::$field_map[$field]))
					{
						$dbfield = self::$field_map[$field];
					}
					$dbfield = $this->sphinxDB->clean_identifier($dbfield);
					$where = $this->$filter_method($dbfield, $value);
					$this->where[] = $where;
					break;
			}
		}
	}

	/**************PROCESSING**************************/

	/**
	 *	Process the filters for the requested tag
	 *	@param array $tagids the ids of the tags to filter on.
	 */
	protected function process_tag_filters($tagids)
	{
		if (empty($tagids))
		{
			return;
		}
		if (is_numeric($tagids))
		{
			$tagids = array($tagids);
		}
		$this->where[] = $this->make_equals_filter('tagid', $tagids);
	}

	/**
	 *	Process the exclude filter
	 *
	 *	@param array $nodeids the ids of the nodes (and it's children) to exclude
	 */
	protected function process_exclude_filters($nodeids)
	{
		if (empty($nodeids))
		{
			return;
		}

		$nodeids = vB::getCleaner()->clean($nodeids, vB_Cleaner::TYPE_ARRAY_UINT);

		$this->where[] = $this->make_notequals_filter('closure', $nodeids);
		$this->where[] = $this->make_notequals_filter('id', $nodeids);
	}

	protected function process_starter_only_filter($starter)
	{
		if ($starter)
		{
			$this->what[] = "(starter = id) as starter_id";
			$this->where[] = "starter_id > 0 AND starter > 0";
		}
	}

	protected function process_reply_only_filter($reply)
	{
		if ($reply)
		{
			$this->what[] = "(starter = parentid) as is_reply";
			$this->where[] = "is_reply > 0";
		}
	}


	protected function process_comment_only_filter($comment)
	{
		if ($comment)
		{
			$this->what[] = "(starter <> parentid AND starter <> id AND starter <> 0) as is_comment";
			$this->where[] = "is_comment > 0";
		}
	}


	protected function process_visitor_message_filter($userid, $type)
	{
		$userid = intval($userid);
		if ($type == 'include')
		{
			$this->what[] = "(userid = $userid OR setfor = $userid) as user_setfor";
			$this->where[] = "user_setfor = 1";
		}
		elseif ($type == 'only')
		{
			$this->what[] = "((userid = $userid AND  setfor <> 0) OR (setfor = $userid AND userid <> 0)) as user_setfor";
			$this->where[] = "user_setfor = 1";
		}
		elseif ($type == 'for')
		{
			$this->where[] = $this->make_equals_filter('setfor', $userid);
		}
		elseif ($type == 'exclude')
		{
			$this->where[] = $this->make_equals_filter('setfor', 0);
		}
	}

	protected function process_private_message_filter($userid, $type)
	{
		$userid = intval($userid);
		$pmcontentypeid = vB_Api::instanceInternal('contenttype')->fetchContentTypeIdFromClass('PrivateMessage');
		if ($type == 'include')
		{
			if (empty($userid))
			{
				$this->where[] = "contenttypeid <> $pmcontentypeid";
			}
			else
			{
				$this->what[] = "(contenttypeid <> $pmcontentypeid OR IN(sentto,$userid)) as user_sentto";
				$this->where[] = "user_sentto = 1";
			}
		}
		elseif ($type == 'only')
		{
			if (empty($userid))
			{
				$this->where[] = "id=0 /** login to see private messages **/";
			}
			$this->where[] = $this->make_equals_filter('sentto', $userid);
			$this->where[] = $this->make_equals_filter('contenttypeid', $pmcontentypeid);
		}
	}

	protected function process_sort(vB_Search_Criteria &$criteria)
	{
		$sort_array = $criteria->get_sort();

		$this->sort = array();

		$sort_map = array
		(
				'user' => 'authorname',
				'author' => 'authorname',
				'publishdate' => 'publishdate',
				'created' => 'created',
				'started' => 'created',
				'last_post' => 'lastcontent',
				'lastcontent' => 'lastcontent',
				'textcount' => 'textcount',
				'replies' => 'textcount',
				'displayorder' => 'displayorder',
				'rank'  => 'rank',
				'relevance' => 'rank',
				'votes' => 'votes'
		);

		foreach ($sort_array as $sort => $direction)
		{
			$direction = strtoupper($direction);
			if (!in_array($direction, array('ASC', 'DESC')))
			{
				$direction = 'ASC';
			}

			// if we don't have a sort, or we have an unrecognized sort type default to relevance descending
			if (!$sort OR (!isset($sort_map[$sort])))
			{
				$sort = 'relevance';
				$direction = 'DESC';
			}

			//look for a core sort option
			if (isset($sort_map[$sort]))
			{
				$sort_field = $sort_map[$sort];
				// process rank sortings
				if ($sort_field == 'rank')
				{
					$this->what[] = "weight() as rank";
				}
				else
				{
					$sort_field = "$sort_field";
				}

				$this->sort[] = $sort_field . ' ' . $direction;
			}
		}
	}

	protected function process_marked_filter($marked) /** two stage */
	{
		$currentUserId = vB::getCurrentSession()->get('userid');

		//this can't be made to happen in the current UI because the general 
		//search filter processing won't function without a valid non guest user.
		if (empty($currentUserId))
		{
			$this->where[] = "id=0 /** no user in session **/";
		}

		$nodeids = vB::getDbAssertor()->getColumn('noderead', 'nodeid',
				array(vB_dB_Query::CONDITIONS_KEY => array('userid' => $currentUserId)),
				false,
				'nodeid'
		);

		//there does not appear to be any way in the current system to get this
		//particular filter.  Fixing it anyway, but without a test.
		if ($marked == vB_API_Search::FILTER_MARKED_READ)
		{
			$this->where[] = $this->make_equals_filter('id', $nodeids);
		}

		if ($marked == vB_API_Search::FILTER_MARKED_UNREAD)
		{
			$this->where[] = $this->make_notequals_filter('id', $nodeids);
		}
	}

	protected function process_channel_filters($channelid, $depth = false, $include_starter = false, $depth_exact = false, $excludeUserSpecific = false)
	{
		//first let's see if this is valid.
		$userdata = vB::getUserContext()->getAllChannelAccess();

		// result set is being pre-cached so include all nodes from selfonly.
		// Nodes from selfonly will be filtered out on second pass
		if ($excludeUserSpecific AND !empty($userdata['selfonly']))
		{
			$userdata['canalwaysview'] = $userdata['canalwaysview'] + $userdata['selfonly'];
			$userdata['selfonly'] = array();
		}

		if (!empty($depth) AND ($depth == 1) AND is_numeric($channelid) AND
				(in_array($channelid, $userdata['canview']) OR in_array($channelid, $userdata['canalwaysview']) OR in_array($channelid, $userdata['canmoderate']) OR
						in_array($channelid, $userdata['selfonly'])))
		{
			$channelid = intval($channelid);
			// The user can moderate the channel.
			if (in_array($channelid, $userdata['canmoderate']))
			{
				$this->where[] = $this->make_equals_filter('parentid', $channelid);
				$this->done_permission_check = true;
				return;
			}
			$userId = vB::getUserContext()->fetchUserId();
			$gitWhere = '';

			// The user can't moderate but is a channel member.
			if (!empty($userId))
			{
				$gitInfo = vB_Api::instanceInternal('user')->getGroupInTopic($userId);

				if (is_array($gitInfo) AND array_key_exists($channelid, $gitInfo))
				{
					$this->where[] = $this->make_equals_filter('parentid', $channelid);
					if (!vB::getUserContext()->getChannelPermission('forumpermissions', 'canseedelnotice', $channelid))
					{
						$this->where[] = "showpublished > 0";
					}
					$this->where[] = "showapproved > 0";

					if (!vB::getUserContext()->getChannelPermission('forumpermissions', 'canviewthreads', $channelid))
					{
						$this->what[] = "(id = starter OR starter = 0) as is_starter";
						$this->where[] = "is_starter = 1";
					}
					$this->done_permission_check = true;
					return;
				}

				if (!empty($gitInfo))
				{
					$gitWhere = " OR id IN (" . implode(',', array_keys($gitInfo)) . ") ";
				}
			}

			//if the user can't moderate, and doesn't have canviewthread, they just get titles and for the starters
			if (!empty($userId) AND in_array($channelid, $userdata['canview']) AND !vB::getUserContext()->getChannelPermission('forumpermissions', 'canviewthreads', $channelid))
			{
				$this->where[] = $this->make_equals_filter('parentid', $channelid);
				if (!vB::getUserContext()->getChannelPermission('forumpermissions', 'canseedelnotice', $channelid))
				{
					$this->where[] = "node.showpublished > 0";
				}
				$this->where[] = "showapproved > 0";

				$this->what[] = "(viewperms > 0 $gitWhere) AS vp";
				$this->where[] = "vp = 1";

				$this->what[] = "(id = starter OR starter = 0) AS is_starter";
				$this->where[] = "is_starter = 1";

				$this->done_permission_check = true;
				return;
			}

			// The user can't moderate, is logged in, isn't a channel member, and has forum permission "can view others".
			if (!empty($userId) AND in_array($channelid, $userdata['canview']))
			{
				$this->where[] = $this->make_equals_filter('parentid', $channelid);
				if (!vB::getUserContext()->getChannelPermission('forumpermissions', 'canseedelnotice', $channelid))
				{
					$this->where[] = "showpublished > 0";
				}
				$this->where[] = "showapproved  > 0";
				$this->what[] = "(viewperms > 0 $gitWhere) as vp";
				$this->where[] = "vp = 1";
				$this->done_permission_check = true;
				return;
			}

			// The user can't moderate, isn't a channel member,  is logged in, and has forum permission "can view posts" but not"can view others".
			if (!empty($userId) AND in_array($channelid, $userdata['selfonly']))
			{
				$this->where[] = $this->make_equals_filter('parentid', $channelid);
				if (!vB::getUserContext()->getChannelPermission('forumpermissions', 'canseedelnotice', $channelid))
				{
					$this->where[] = "showpublished > 0";
				}
				$this->where[] = "showapproved  > 0";
				$this->where[] = "userid = $userId";
				$this->done_permission_check = true;
				return;
			}

			// The user can't moderate, isn't logged in, and has forum permission "can view others"
			if (empty($userId) AND in_array($channelid, $userdata['canview']))
			{
				$this->where[] = $this->make_equals_filter('parentid', $channelid);
				if (!vB::getUserContext()->getChannelPermission('forumpermissions', 'canseedelnotice', $channelid))
				{
					$this->where[] = "showpublished > 0";
				}
				$this->where[] = "showapproved > 0";
				$this->where[] = "viewperms = 2";
				$this->done_permission_check = true;
				return;
			}
		}

		$this->where[] = $this->make_equals_filter('closure', $channelid);
		// if it got here we need to do it the slow way

		if (empty($include_starter))
		{
			$this->what[] = '(id = starter) as is_starter2';
			$this->where[] = 'is_starter2 = 1';
		}

		if (!empty($depth))
		{
			$depth = intval($depth);
			$channelsIDs = (array) $channelid;
			foreach ($channelsIDs as $n)
			{
				if ($depth_exact !== false)
				{
					$this->where[] = "depth.n$n = $depth";
				}
				else
				{
					$this->where[] = "depth.n$n <= $depth";
				}
			}
		}

		$canviewthreads = true;
		if (is_array($channelid))
		{
			foreach ($channelid as $chid)
			{
				if(!vB::getUserContext()->getChannelPermission('forumpermissions', 'canviewthreads', intval($chid)))
				{
					$canviewthreads = false;
					break;
				}
			}
		}
		elseif (is_numeric($channelid) AND !vB::getUserContext()->getChannelPermission('forumpermissions', 'canviewthreads', $channelid))
		{
			$canviewthreads = false;
		}
		if (!$canviewthreads)
		{
			$this->what[] = "(id = starter OR starter = 0) as is_starter";
			$this->where[] = "is_starter = 1";
		}
	}

	protected function process_view_filters($view)
	{
		if (empty($view))
		{
			return;
		}
		switch ($view)
		{
			/**
			 * only include the latest reply or comment (or the starter itself if no replies/comments yet) per starter in all the channels.
			 * Filters out the Channel nodes from the Search API nodes results.
			 * @include replies/comments in the second phase
			 */
			case vB_Api_Search::FILTER_VIEW_ACTIVITY :
				$datecheck = false;
				// search for publishdate through filters
				foreach ($this->filters AS $type)
				{
					if (is_array($type) AND !$datecheck)
					{
						$datecheck = array_key_exists('publishdate', $type);
					}
				}

				$this->what[] = "(id = starter) as id_starter2";
				$this->where[] = "id_starter2 = 1";

 				$this->where[] = "contenttypeid <> " . vB_Api::instanceInternal('contenttype')->fetchContentTypeIdFromClass('Channel');

				$channelAccess = vb::getUserContext()->getAllChannelAccess();

				if (!empty($this->filters['make_equals_filter']['starter_only']))
				{
					array_unshift($this->what, 'starter');
				}
				else if ((!empty($channelAccess['starteronly'])))
				{
					$starterOnly = implode(',', $channelAccess['starteronly']);
					array_unshift($this->what, "IF(IN(starter, $starterOnly) OR IN(starterparent, $starterOnly), starter, lastcontentid) AS last");
					$this->groupby = 'last';
				}
				else
				{
	 				array_unshift($this->what, 'lastcontentid');
	 				$this->groupby = 'lastcontentid';
				}
				unset($channelAccess);

				if (!$datecheck)
				{
					$age = vB::getDatastore()->getOption('max_age_channel');

					if (empty($age))
					{
					$age = 60;
					}

					$this->where[] = "created > " . (vB::getRequest()->getTimeNow() - ($age * 86400));
				}
				// in activity stream we don't want deleted content even if viewed by a moderator
				$this->where[] = "showpublished > 0";
			break;

				/**
				* The Topic view should only display the starter nodes for the specified channel.
				* Filters out the Channel nodes from the Search API nodes results.
				*/
			case vB_Api_Search::FILTER_VIEW_TOPIC :
				array_unshift($this->what, 'starter');
				$this->groupby = 'starter';
				$this->where[] = "contenttypeid <> " . vB_Api::instanceInternal('contenttype')->fetchContentTypeIdFromClass('Channel');
			break;
				/**
				 * The Conversation Detail view should only display the descendant nodes of (and including) the specified starter.
				 * Filters out the Comment node from the Search API nodes results.
				 */
			case vB_Api_Search::FILTER_VIEW_CONVERSATION_THREAD :
				$this->what[] = "(id = starter OR starter = parentid) as starter_node";
				$this->where[] = "starter_node = 1";
				break;
			case vB_Api_Search::FILTER_VIEW_CONVERSATION_THREAD_SEARCH :
				array_unshift($this->what, "IF(parentid = 0 OR id = starter OR starter = parentid, id, parentid) as starter_node");
				$this->groupby = 'starter_node';
				break;
				/**
				 * The Conversation Detail view should only display the descendant nodes of (and including) the specified starter.
				 * the Comment nodes are not filtered out.
				 * This should be handled by the channel filter
				 */
			case vB_Api_Search::FILTER_VIEW_CONVERSATION_STREAM :
				break;
		}
	}

	protected function process_follow_filters($value, vB_Search_Criteria &$criteria) /** multi stage */
	{
		$type = $value['type'];
		$userid = intval($value['userid']);
		$assertor = vB::getDbAssertor();

		if (
				$type == vB_Api_Search::FILTER_FOLLOWING_BOTH OR
				$type == vB_Api_Search::FILTER_FOLLOWING_ALL OR
				$type == vB_Api_Search::FILTER_FOLLOWING_CHANNEL OR
				$type == vB_Api_Search::FILTER_FOLLOWING_CONTENT
		)
		{
			/* following nodes */
			$subscriptions = $assertor->getRows('vBForum:subscribediscussion', array(vB_dB_Query::TYPE_KEY => vB_dB_Query::QUERY_SELECT,
					vB_dB_Query::CONDITIONS_KEY => array('userid' => $userid)),
					false,
					'discussionid'
			);
			$nodes = (!$subscriptions OR !empty($subscriptions['errors'])) ? array() : $subscriptions;
			$nodeids = array_keys($nodes);
			if (empty($nodeids) AND (
					$type == vB_Api_Search::FILTER_FOLLOWING_CHANNEL OR
					$type == vB_Api_Search::FILTER_FOLLOWING_CONTENT OR
					$type == vB_Api_Search::FILTER_FOLLOWING_BOTH
			)
			)
			{
				$this->where[] = "id=0 /** no subscriptions for user $userid **/";
				return;
			}
		}
		if (($type == vB_Api_Search::FILTER_FOLLOWING_ALL) OR ($type == vB_Api_Search::FILTER_FOLLOWING_USERS))
		{
			/* following users */
			$follows = vB_Api::instanceInternal('Follow')->getUserList($userid, 'following', 'follow');
			$cache = vB_Cache::instance(vB_Cache::CACHE_FAST);
			$follows = $cache->read("vbUserlistFollowFriend_$userid");
			if (empty($follows))
			{
				$follows = $assertor->getRows('userlist', 
					array(
						vB_dB_Query::TYPE_KEY => vB_dB_Query::QUERY_SELECT,
						vB_dB_Query::CONDITIONS_KEY => array(
							'userid' => $userid, 'type' => 'follow', 'friend' => 'yes'
						)
					),
					false,
					'relationid'
				);
				$cache->write("vbUserlistFollowFriend_$userid", $follows, 'followChg_' . $userid);
			}

			$userids = empty($follows) ? array() : array_keys($follows);
			if (empty($userids) AND $type == vB_Api_Search::FILTER_FOLLOWING_USERS)
			{
				$this->where[] = "id=0 /** no following for user $userid **/";
				return;
			}
		}

		if ($type == vB_Api_Search::FILTER_FOLLOWING_ALL AND empty($nodeids) AND empty($userids))
		{
			$this->where[] = "id=0 /** no following for user $userid **/";
			return;
		}

		if ($type == vB_Api_Search::FILTER_FOLLOWING_CHANNEL)
		{
			$this->filters['make_equals_filter']['channelid'] = $nodeids;
			$channelcontentypeid = vB_Api::instanceInternal('contenttype')->fetchContentTypeIdFromClass('Channel');
			$this->where[] = $this->make_notequals_filter('contenttypeid', $channelcontentypeid);
			return;
		}

		if ($type == vB_Api_Search::FILTER_FOLLOWING_CONTENT)
		{
			$channelcontentypeid = vB_Api::instanceInternal('contenttype')->fetchContentTypeIdFromClass('Channel');

			$this->where[] = $this->make_equals_filter('id', $nodeids);
			$this->where[] = $this->make_notequals_filter('contenttypeid', $channelcontentypeid);
			return;
		}

		if ($type == vB_Api_Search::FILTER_FOLLOWING_USERS OR ($type == vB_Api_Search::FILTER_FOLLOWING_ALL AND empty($nodeids)))
		{
			$this->where[] = $this->make_equals_filter('userid', $userids);
			return;
		}

		if ($type == vB_Api_Search::FILTER_FOLLOWING_BOTH)
		{
			$nodes = $assertor->assertQuery('vBDBSearch:getNodesWithSubChannel', array('nodeids'=>$nodeids));

			$allNodeIds = array();
			foreach ($nodes as $nodeid)
			{
				$allNodeIds[] = $nodeid['nodeid'];
			}

			//I don't think we can get here because if nodeids is empty we'll bail earlier and if it 
			//isn't then we should get at least the values for nodeids back from the query.  We'll
			//leave it in as it might be useful if the data gets a little inconsistant. 
			if (empty($allNodeIds))
			{
				$this->where[] = "id=0 /** no following for user $userid **/";
				return;
			}

			$this->where[] = $this->make_equals_filter('id', $allNodeIds);
			return;
		}

		if ($type == vB_Api_Search::FILTER_FOLLOWING_ALL)
		{
			$nodes = $assertor->assertQuery('vBDBSearch:getNodesWithSubChannel', array('nodeids'=>$nodeids));
			$allNodeIds = array();
			foreach ($nodes as $nodeid)
			{
				$allNodeIds[] = $nodeid['nodeid'];
			}

			//I don't think we can get here because if nodeids is empty we'll bail earlier and if it 
			//isn't then we should get at least the values for nodeids back from the query.  We'll
			//leave it in as it might be useful if the data gets a little inconsistant. 	
			if (empty($allNodeIds))
			{
				$this->where[] = "id=0 /** no following for user $userid **/";
				return;
			}

			/** @todo OR operator is not supported by sphinx*/
			// $this->filters['make_equals_filter']['OR'] = array('nodeid' => $allNodeIds, 'userid' => $userids);
			// workarond for missiong support for OR operator
			$nodeids = $assertor->getColumn('vBForum:node', 'nodeid', array('userid' => $userids));
			$this->where[] = $this->make_equals_filter('id', $allNodeIds + $nodeids);
			return;
		}
	}

	public function PostProcessorAddComments($nodeids, vB_Search_Criteria $criteria)
	{
		$this->process_sort($criteria);

		$this->where[] = $this->make_equals_filter('parentid', $nodeids);
		$this->where[] = $this->make_notequals_filter('id', $nodeids);
		array_unshift($this->where, "MATCH('" . $this->sphinxEscapeString($criteria->get_raw_keywords()) . "')");

		$groupby = '';
		if (!empty($this->groupby))
		{
			$groupby = '
			GROUP BY ' . $this->groupby;
		}

		$res = $this->sphinxDB->query($query = '
				SELECT ' . implode(', ', $this->what) . '
				FROM ' . $this->table . '
				WHERE ' . implode(' AND ', $this->where) . $groupby . '
				ORDER BY ' . implode(', ', $this->sort) . "
				/**" . __FUNCTION__ . (defined('THIS_SCRIPT') ? '- ' . THIS_SCRIPT : '') . "
						" . print_r($criteria->getJSON(),true) . "**/");

		while($row = $this->sphinxDB->fetch_array($res))
		{
			$value = current($row);
			$nodeids[$value] = $value;
		}

		$config = vB::getConfig();

		if (!empty($config['Misc']['debug_sql']) OR self::DEBUG)
		{
			echo "$query;\n";
		}

		return $nodeids;
	}

	/**************HELPER FUNCTIONS**************************/

	private function compute_changes(&$node)
	{
		$existing = $this->sphinxDB->query_first($query = "SELECT * FROM " . $this->table . " WHERE id = " . $node['nodeid']);
		$assertor = vB::getDbAssertor();
		$node['tagid'] = $assertor->getColumn('vBForum:tagnode', 'tagid', array('nodeid' => $node['nodeid']),'tagid');
		$closure = $assertor->assertQUery('vBForum:closure', array('child' => $node['nodeid']),'child');
		$parents = array();
		$depth = array();
		foreach ($closure as $value)
		{
			$node['closure'][] = $value['parent'];
			$depth[] = '"n' . $value['parent'] . '":' . $value['depth'];
		}
		//building a json structure for the depth field that contains the depth of each parent
		$node['depth'] = '{' . implode(',', $depth) . '}';
		$nodeLib = vB_Library::instance('node');
		$node['starterparent'] = $nodeLib->getChannelId($node);
		if (!empty($node['starter']))
		{
			$starter = $nodeLib->getNodeBare($node['starter']);
			$node['starteruser'] = $starter['userid'];
		}
		else
		{
			$node['starteruser'] = 0;
		}
		//populate the sentto only when the node is a private message
		if ($node['contenttypeid'] == vB_Api::instanceInternal('ContentType')->fetchContentTypeIdFromClass('PrivateMessage'))
		{
			$node['sentto'] = $assertor->getColumn('vBForum:sentto', 'userid', array('nodeid' => $node['nodeid'], 'deleted' => 0),'userid');
		}
		$update = array();
		$need_reindex = false;
		if (!empty($existing))
		{
			unset ($existing['id']);

			foreach ($existing as $attribute => $value)
			{
				//some attributes are not defined if they are not relevant: sentto
				if (!isset($node[$attribute]))
				{
					continue;
				}

				//when both old and new values are empty we don't need to update it
				if (empty($node[$attribute]) AND empty($value))
				{
					continue;
				}

				//multi type attributes are comma separated values, we need to convert them to arrays
				if ($this->attributes_definition[$attribute] == 'rt_attr_multi')
				{
					$value = explode(',', $value);
					$existing[$attribute] = $value;
				}

				// json values need to be matched individually
				if ($this->attributes_definition[$attribute] == 'rt_attr_json')
				{
					$old_depth = @json_decode($value, true);
					$new_depth = @json_decode($node[$attribute], true);
					if (empty($new_depth))
					{
						continue;
					}

					//when both keys and values match between the old and new values, we can ignore updating this attribute
					if (!empty($new_depth) AND (count( array_intersect_assoc($old_depth, $new_depth)) == count($new_depth)))
					{
						continue;
					}
				}

				// checking array values for changes
				if (is_array($node[$attribute]) AND is_array($value) AND (count(array_intersect($node[$attribute], $value)) == count($value)))
				{
					continue;
				}

				// this is an attribute that needs to be updated
				if ($node[$attribute] != $value)
				{
					$update[$attribute] = $node[$attribute];
					//we need to update one of the string attributes. string attributes can't be updated using UPDATE, 
					//we need to use REPLACE which means re-indexing the whole node
					//JSON attributes are treated basically like strings and need to be treated the same way.
					//There are suggestions that you can update scalar values within a JSON attribute by accessing the key directly, 
					//but I couldn't get that to work and it probably doesn't help us much because typically the keys are going to change 
					//and not just the values.
					if (in_array($this->attributes_definition[$attribute], array('rt_attr_string', 'rt_attr_json')))
					{
						$need_reindex = true;
					}
				}
			}

		}
		return array('changes' => $update, 'existing' => $existing, 'reindex' => $need_reindex);
	}

	private function make_equals_filter($field, $value)
	{
		$value = $this->quote_smart($field, $value);

		if (is_array($value))
		{
			return "$field IN (" . implode(',', $value) . ")";
		}
		else
		{
			return "$field = $value";
		}
	}

	private function make_notequals_filter($field, $value)
	{
		$value = $this->quote_smart($field, $value);

		if (is_array($value))
		{
			return "$field NOT IN (" . implode(',', $value) . ")";
		}
		else
		{
			return "$field <> $value";
		}

	}

	private function make_range_filter($field, $values)
	{
		//null mean infinity in a given direction
		if (!is_null($values[0]) AND !is_null($values[1]))
		{
			$values = $this->quote_smart($field, $values);
			return "($field BETWEEN $values[0] AND $values[1])";
		}
		else if (!is_null($values[0]))
		{
			$value = $this->quote_smart($field, $values[0]);
			return "$field >= $value";
		}
		else if (!is_null($values[1]))
		{
			$value = $this->quote_smart($field, $values[1]);
			return "$field <= $value";
		}
	}

	private function quote_smart($field, $value, $is_handled = true)
	{
		if ($is_handled AND is_array($value) AND count($value) == 1)
		{
			$value = array_pop($value);
		}

		if ($this->attributes_definition[$field] == 'rt_attr_string')
		{
			if (empty($value))
			{
				return "''";
			}

			if (is_array($value))
			{
				foreach ($value as $k => $v)
				{
					$value[$k] = "'" . $this->sphinxEscapeString($v) . "'";
				}
				return $value;
			}
			else
			{
				return "'" . $this->sphinxEscapeString($value) . "'";
			}
		}

		if ($this->attributes_definition[$field] == 'rt_attr_json')
		{
			if (empty($value))
			{
				return "''";
			}
			else
			{
				return "'$value'";
			}
		}


		if ($this->attributes_definition[$field] == 'rt_attr_multi')
		{
			if (!$is_handled AND empty($value)){
				return '()';
			}

			if ($is_handled OR !is_array($value))
			{
				return $value;
			}

			return '(' . implode(',', $value) . ')';

		}

		if (empty($value))
		{
			return 0;
		}

		if (is_bool($value))
		{
			return $value ?  1 : 0;
		}

		return $value;
	}

	private function exec_command($command, $silent = false)
	{
		exec($command, $output);
		$haserror = false;
		foreach ($output as $string)
		{
			if (!$silent)
			{
				echo $string . "\n";
			}

			if ((strpos($string, 'ERROR') === 0) OR (strpos($string, 'WARNING') === 0) OR (strpos($string, 'FATAL') === 0))
			{
				$haserror = true;
			}
		}

		if ($haserror)
		{
			throw new vB_Exception_Api('sphinx_error_x', array(implode("\n", $output)), '', false, false, false, true);
		}
	}

	private function exec_command_feedback($command, $silent = false)
	{
		$output = '';
		$fp=popen($command, "r");
		stream_set_blocking($fp, 0);
		while(!feof($fp))
		{
			$buffer = fread($fp, 100);
			if (empty($buffer))
			{
				echo '.';
				flush();
				sleep(5);
			}
			else
			{
				$output .= $buffer;
			}
		}
		pclose($fp);
		if ((strpos($output, 'ERROR') === 0) OR (strpos($output, 'WARNING') === 0) OR (strpos($output, 'FATAL') === 0))
		{
				throw new vB_Exception_Api('sphinx_error_x', $output);
		}
		elseif (!$silent)
		{
			echo $output;
		}
	}

	private function restart($silent = false)
	{
		$config = vB::getConfig();
		// close the current connection before restarting the service
		$this->sphinxDB->close();

		// restart the service
		//windows
		if (stripos(@php_uname('s'), "win") !== false)
		{
			$this->exec_command('net stop SphinxSearch', $silent);
			$this->exec_command('net start SphinxSearch', $silent);
		}
		//unix
		else
		{
			$this->exec_command($config['Misc']['sphinx_path'] . '/bin/searchd --config ' . $config['Misc']['sphinx_config'] . ' --stopwait', $silent);
			$this->exec_command($config['Misc']['sphinx_path'] . '/bin/searchd --config ' . $config['Misc']['sphinx_config'], $silent);
		}
		// need to reconnect after restarting the service
		$this->sphinxDB = new vB_Database();
		$this->sphinxDB->connect('', $config['Misc']['sphinx_host'], $config['Misc']['sphinx_port'], '', '', false);
	}

	/** Composes the terms for the flags to enforce the starter-node-specific permissions.
	 *
	 * @param	$excludeUserSpecific	bool	Exclude user specific queries. Used for precaching
	 **/
	protected function setNodePermTerms($excludeUserSpecific = false)
	{
		$userContext = vB::getUserContext();

		if (empty($userContext))
		{
			$this->where[] = 'id = 0 /* no user context */';
			return;
		}
		if ($userContext->isSuperAdmin())
		{
			return;
		}

		$userid = vB::getCurrentSession()->get('userid');
		$channelAccess = $userContext->getAllChannelAccess();

		$condition = array();

		if (!empty($channelAccess['canmoderate']))
		{
			$condition[] = '(IN(starterparent,' . implode(',', $channelAccess['canmoderate']) . ') OR IN(starter,' . implode(',', $channelAccess['canmoderate']) . '))';
		}

		$starterAnd = '';

		if (!empty($channelAccess['canseedelnotice']))
		{
			$starterAnd = 'AND (IN(starterparent, ' . implode(',', $channelAccess['canseedelnotice']) . ') OR showpublished > 0)';
		}


		if (!empty($channelAccess['canview']))
		{
			$showParams = array(
					'showapproved > 0',
					$userid > 0 ? 'viewperms > 0' : 'viewperms > 1',
			);

			if (empty($channelAccess['canseedelnotice']))
			{
				$showParams[] = 'showpublished > 0';
			}

			$condition[] = '(((IN(starterparent,' . implode(',', $channelAccess['canview']) . ") $starterAnd) AND " . implode(' AND ', $showParams) . "))\n";
		}

		if (!empty($channelAccess['canalwaysview']))
		{
			$condition[] = 'IN(starterparent,' . implode(',', $channelAccess['canalwaysview']) . ')';
		}

		if (!empty($channelAccess['starteronly']))
		{
			$starterOnly = implode(',', $channelAccess['starteronly']);
			$condition[] = "(IN(id,$starterOnly) OR IN(parentid, $starterOnly))";
		}

		if (!empty($channelAccess['selfonly']))
		{
			if ($excludeUserSpecific)
			{
				$condition[] = 'IN(starterparent,' . implode(',', $channelAccess['selfonly']) . ')';
			}
			else
			{
				// Result set it not being pre-cached
				$condition[] = '(IN(starterparent,' . implode(',', $channelAccess['selfonly']) . ") AND starteruser = $userid)";
			}
		}

		/* 'owndeleted' is not currently set by ->getAllChannelAccess();
		 This code should be deleted if it serves no purpose
		if (!empty($channelAccess['owndeleted']))
		{
			$condition[] = '(IN(starterparent,' . implode(',', $channelAccess['owndeleted']) . ") AND userid = $userid)";
		}*/


		if (!empty($channelAccess['member']))
		{
			$showParams = array(
					'showapproved > 0'
			);

			if (empty($channelAccess['canseedelnotice']))
			{
				$showParams[] = 'showpublished > 0';
			}

			$condition[] = '((IN(starterparent' . implode(',', $channelAccess['member']) . ") $starterAnd) AND " . implode(' AND ', $showParams) . ")\n";
		}

		if (empty($condition))
		{
			$this->where[] = 'id = 0 /* no permissions */';
			return;
		}

		$this->what[] = '(' . implode (' OR ', $condition) . ') AS permconditions';
		$this->where[] = 'permconditions = 1';
	}


	/*
	 * The mysql_real_escape_string function does not correctly handle escaping sphinx strings.  So we do it the hard way.
	 */
	public function sphinxEscapeString($toEscape)
	{
		//handle sphinx special chars
		$from = array('\\', '(',')','|','-','!','@','~','"','&', '/', '^', '$', '=');
		$to   = array('\\\\', '\(','\)','\|','\-','\!','\@','\~','\"', '\&', '\/', '\^', '\$', '\=');

		//we need to do both sphinx and mysql escaping see advice in http://sphinxsearch.com/bugs/view.php?id=1713
		return $this->sphinxDB->escape_string(str_replace ($from, $to, $toEscape));
	}
}
