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<?php
/**
* Implements Special:DoubleRedirects
*
* 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
* @ingroup SpecialPage
*/
/**
* A special page listing redirects to redirecting page.
* The software will automatically not follow double redirects, to prevent loops.
*
* @ingroup SpecialPage
*/
class DoubleRedirectsPage extends PageQueryPage {
function __construct( $name = 'DoubleRedirects' ) {
parent::__construct( $name );
}
function isExpensive() { return true; }
function isSyndicated() { return false; }
function sortDescending() { return false; }
function getPageHeader() {
return wfMsgExt( 'doubleredirectstext', array( 'parse' ) );
}
function reallyGetQueryInfo( $namespace = null, $title = null ) {
$limitToTitle = !( $namespace === null && $title === null );
$retval = array (
'tables' => array ( 'ra' => 'redirect',
'rb' => 'redirect', 'pa' => 'page',
'pb' => 'page', 'pc' => 'page' ),
'fields' => array ( 'pa.page_namespace AS namespace',
'pa.page_title AS title',
'pb.page_namespace AS nsb',
'pb.page_title AS tb',
'pc.page_namespace AS nsc',
'pc.page_title AS tc' ),
'conds' => array ( 'ra.rd_from = pa.page_id',
'pb.page_namespace = ra.rd_namespace',
'pb.page_title = ra.rd_title',
'rb.rd_from = pb.page_id',
'pc.page_namespace = rb.rd_namespace',
'pc.page_title = rb.rd_title' )
);
if ( $limitToTitle ) {
$retval['conds']['pa.page_namespace'] = $namespace;
$retval['conds']['pa.page_title'] = $title;
}
return $retval;
}
function getQueryInfo() {
return $this->reallyGetQueryInfo();
}
function getOrderFields() {
return array ( 'ra.rd_namespace', 'ra.rd_title' );
}
function formatResult( $skin, $result ) {
global $wgLang;
$titleA = Title::makeTitle( $result->namespace, $result->title );
if ( $result && !isset( $result->nsb ) ) {
$dbr = wfGetDB( DB_SLAVE );
$qi = $this->reallyGetQueryInfo( $result->namespace,
$result->title );
$res = $dbr->select($qi['tables'], $qi['fields'],
$qi['conds'], __METHOD__ );
if ( $res ) {
$result = $dbr->fetchObject( $res );
}
}
if ( !$result ) {
return '<del>' . $skin->link( $titleA, null, array(), array( 'redirect' => 'no' ) ) . '</del>';
}
$titleB = Title::makeTitle( $result->nsb, $result->tb );
$titleC = Title::makeTitle( $result->nsc, $result->tc );
$linkA = $skin->linkKnown(
$titleA,
null,
array(),
array( 'redirect' => 'no' )
);
$edit = $skin->linkKnown(
$titleA,
wfMsgExt( 'parentheses', array( 'escape' ), wfMsg( 'editlink' ) ),
array(),
array(
'redirect' => 'no',
'action' => 'edit'
)
);
$linkB = $skin->linkKnown(
$titleB,
null,
array(),
array( 'redirect' => 'no' )
);
$linkC = $skin->linkKnown( $titleC );
$arr = $wgLang->getArrow() . $wgLang->getDirMark();
return( "{$linkA} {$edit} {$arr} {$linkB} {$arr} {$linkC}" );
}
}
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