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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 getName() {
return 'DoubleRedirects';
}
function isExpensive( ) { return true; }
function isSyndicated() { return false; }
function getPageHeader( ) {
return wfMsgExt( 'doubleredirectstext', array( 'parse' ) );
}
function getSQLText( &$dbr, $namespace = null, $title = null ) {
list( $page, $redirect ) = $dbr->tableNamesN( 'page', 'redirect' );
$limitToTitle = !( $namespace === null && $title === null );
$sql = $limitToTitle ? "SELECT" : "SELECT 'DoubleRedirects' as type," ;
$sql .=
" 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" .
" FROM $redirect AS ra, $redirect AS rb, $page AS pa, $page AS pb, $page AS pc" .
" WHERE ra.rd_from=pa.page_id" .
" AND ra.rd_namespace=pb.page_namespace" .
" AND ra.rd_title=pb.page_title" .
" AND rb.rd_from=pb.page_id" .
" AND rb.rd_namespace=pc.page_namespace" .
" AND rb.rd_title=pc.page_title";
if( $limitToTitle ) {
$encTitle = $dbr->addQuotes( $title );
$sql .= " AND pa.page_namespace=$namespace" .
" AND pa.page_title=$encTitle";
}
return $sql;
}
function getSQL() {
$dbr = wfGetDB( DB_SLAVE );
return $this->getSQLText( $dbr );
}
function getOrder() {
return '';
}
function formatResult( $skin, $result ) {
global $wgContLang;
$fname = 'DoubleRedirectsPage::formatResult';
$titleA = Title::makeTitle( $result->namespace, $result->title );
if ( $result && !isset( $result->nsb ) ) {
$dbr = wfGetDB( DB_SLAVE );
$sql = $this->getSQLText( $dbr, $result->namespace, $result->title );
$res = $dbr->query( $sql, $fname );
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 = $wgContLang->getArrow() . $wgContLang->getDirMark();
return( "{$linkA} {$edit} {$arr} {$linkB} {$arr} {$linkC}" );
}
}
/**
* constructor
*/
function wfSpecialDoubleRedirects() {
list( $limit, $offset ) = wfCheckLimits();
$sdr = new DoubleRedirectsPage();
return $sdr->doQuery( $offset, $limit );
}
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