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<?php defined("SYSPATH") or die("No direct script access.");
/**
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2013 Bharat Mediratta
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
*/
class search_Core {
/**
* Add more terms to the query by wildcarding the stem value of the first
* few terms in the query.
*/
static function add_query_terms($q) {
$MAX_TERMS = 5;
$terms = explode(" ", $q, $MAX_TERMS);
for ($i = 0; $i < min(count($terms), $MAX_TERMS - 1); $i++) {
// Don't wildcard quoted or already wildcarded terms
if ((substr($terms[$i], 0, 1) != '"') && (substr($terms[$i], -1, 1) != "*")) {
$terms[] = rtrim($terms[$i], "s") . "*";
}
}
return implode(" ", $terms);
}
static function search($q, $limit, $offset) {
return search::search_within_album($q, item::root(), $limit, $offset);
}
static function search_within_album($q, $album, $limit, $offset) {
$db = Database::instance();
$query = self::_build_query_base($q, $album) .
"ORDER BY `score` DESC " .
"LIMIT $limit OFFSET " . (int)$offset;
$data = $db->query($query);
$count = $db->query("SELECT FOUND_ROWS() as c")->current()->c;
return array($count, new ORM_Iterator(ORM::factory("item"), $data));
}
private static function _build_query_base($q, $album, $where=array()) {
$db = Database::instance();
$q = $db->escape($q);
if (!identity::active_user()->admin) {
foreach (identity::group_ids_for_active_user() as $id) {
$fields[] = "`view_$id` = TRUE"; // access::ALLOW
}
$access_sql = " AND (" . join(" OR ", $fields) . ")";
} else {
$access_sql = "";
}
if ($album->id == item::root()->id) {
$album_sql = "";
} else {
$album_sql =
" AND {items}.left_ptr > " .$db->escape($album->left_ptr) .
" AND {items}.right_ptr <= " . $db->escape($album->right_ptr);
}
return
"SELECT SQL_CALC_FOUND_ROWS {items}.*, " .
" MATCH({search_records}.`data`) AGAINST ('$q') AS `score` " .
"FROM {items} JOIN {search_records} ON ({items}.`id` = {search_records}.`item_id`) " .
"WHERE MATCH({search_records}.`data`) AGAINST ('$q' IN BOOLEAN MODE) " .
$album_sql .
(empty($where) ? "" : " AND " . join(" AND ", $where)) .
$access_sql .
" ";
}
/**
* @return string An error message suitable for inclusion in the task log
*/
static function check_index() {
list ($remaining) = search::stats();
if ($remaining) {
site_status::warning(
t('Your search index needs to be updated. <a href="%url" class="g-dialog-link">Fix this now</a>',
array("url" => html::mark_clean(url::site("admin/maintenance/start/search_task::update_index?csrf=__CSRF__")))),
"search_index_out_of_date");
}
}
static function update($item) {
$data = new ArrayObject();
$record = ORM::factory("search_record")->where("item_id", "=", $item->id)->find();
if (!$record->loaded()) {
$record->item_id = $item->id;
}
$item = $record->item();
module::event("item_index_data", $item, $data);
$record->data = join(" ", (array)$data);
$record->dirty = 0;
$record->save();
}
static function stats() {
$remaining = db::build()
->from("items")
->join("search_records", "items.id", "search_records.item_id", "left")
->and_open()
->where("search_records.item_id", "IS", null)
->or_where("search_records.dirty", "=", 1)
->close()
->count_records();
$total = ORM::factory("item")->count_all();
$percent = round(100 * ($total - $remaining) / $total);
return array($remaining, $total, $percent);
}
static function get_position($item, $q) {
return search::get_position_within_album($item, $q, item::root());
}
static function get_position_within_album($item, $q, $album) {
$page_size = module::get_var("gallery", "page_size", 9);
$query = self::_build_query_base($q, $album, array("{items}.id = " . $item->id));
$db = Database::instance();
// Truncate the score by two decimal places as this resolves the issues
// that arise due to in exact numeric conversions.
$current = $db->query($query)->current();
if (!$current) {
// We can't find this result in our result set - perhaps we've fallen out of context? Clear
// the context and try again.
item::clear_display_context_callback();
url::redirect(url::current());
}
$score = $current->score;
if (strlen($score) > 7) {
$score = substr($score, 0, strlen($score) - 2);
}
$data = $db->query(self::_build_query_base($q, $album) . " HAVING `score` >= " . $score);
$data->seek($data->count() - 1);
while ($data->get("id") != $item->id && $data->prev()->valid()) {
}
return $data->key() + 1;
}
}
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