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<?php
/**
* 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.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
use Wikimedia\Rdbms\Database;
use Wikimedia\Rdbms\IResultWrapper;
class ReplaceTextSearch {
/**
* @param string $search
* @param array $namespaces
* @param string $category
* @param string $prefix
* @param bool $use_regex
* @return IResultWrapper Resulting rows
*/
public static function doSearchQuery(
$search, $namespaces, $category, $prefix, $use_regex = false
) {
$dbr = wfGetDB( DB_REPLICA );
$tables = [ 'page', 'revision', 'text' ];
$vars = [ 'page_id', 'page_namespace', 'page_title', 'old_text' ];
if ( $use_regex ) {
$comparisonCond = self::regexCond( $dbr, 'old_text', $search );
} else {
$any = $dbr->anyString();
$comparisonCond = 'old_text ' . $dbr->buildLike( $any, $search, $any );
}
$conds = [
$comparisonCond,
'page_namespace' => $namespaces,
'rev_id = page_latest',
'rev_text_id = old_id'
];
self::categoryCondition( $category, $tables, $conds );
self::prefixCondition( $prefix, $conds );
$options = [
'ORDER BY' => 'page_namespace, page_title',
// 250 seems like a reasonable limit for one screen.
// @TODO - should probably be a setting.
'LIMIT' => 250
];
return $dbr->select( $tables, $vars, $conds, __METHOD__, $options );
}
/**
* @param string $category
* @param array &$tables
* @param array &$conds
*/
public static function categoryCondition( $category, &$tables, &$conds ) {
if ( strval( $category ) !== '' ) {
$category = Title::newFromText( $category )->getDbKey();
$tables[] = 'categorylinks';
$conds[] = 'page_id = cl_from';
$conds['cl_to'] = $category;
}
}
/**
* @param string $prefix
* @param array &$conds
*/
public static function prefixCondition( $prefix, &$conds ) {
if ( strval( $prefix ) === '' ) {
return;
}
$dbr = wfGetDB( DB_REPLICA );
$title = Title::newFromText( $prefix );
if ( !is_null( $title ) ) {
$prefix = $title->getDbKey();
}
$any = $dbr->anyString();
$conds[] = 'page_title ' . $dbr->buildLike( $prefix, $any );
}
/**
* @param Database $dbr
* @param string $column
* @param string $regex
* @return string query condition for regex
*/
public static function regexCond( $dbr, $column, $regex ) {
if ( $dbr->getType() == 'postgres' ) {
$op = '~';
} else {
$op = 'REGEXP';
}
return "$column $op " . $dbr->addQuotes( $regex );
}
}
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