includes/specials/SpecialDoubleRedirects.php

   1 <?php
   2 /**
   3  * Implements Special:DoubleRedirects
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * A special page listing redirects to redirecting page.
  26  * The software will automatically not follow double redirects, to prevent loops.
  27  *
  28  * @ingroup SpecialPage
  29  */
  30 class DoubleRedirectsPage extends PageQueryPage {
  31
  32         function __construct( $name = 'DoubleRedirects' ) {
  33                 parent::__construct( $name );
  34         }
  35
  36         function isExpensive() { return true; }
  37         function isSyndicated() { return false; }
  38         function sortDescending() { return false; }
  39
  40         function getPageHeader() {
  41                 return wfMsgExt( 'doubleredirectstext', array( 'parse' ) );
  42         }
  43
  44         function reallyGetQueryInfo( $namespace = null, $title = null ) {
  45                 $limitToTitle = !( $namespace === null && $title === null );
  46                 $retval = array (
  47                         'tables' => array ( 'ra' => 'redirect',
  48                                         'rb' => 'redirect', 'pa' => 'page',
  49                                         'pb' => 'page', 'pc' => 'page' ),
  50                         'fields' => array ( 'pa.page_namespace AS namespace',
  51                                         'pa.page_title AS title',
  52                                         'pb.page_namespace AS nsb',
  53                                         'pb.page_title AS tb',
  54                                         'pc.page_namespace AS nsc',
  55                                         'pc.page_title AS tc' ),
  56                         'conds' => array ( 'ra.rd_from = pa.page_id',
  57                                         'pb.page_namespace = ra.rd_namespace',
  58                                         'pb.page_title = ra.rd_title',
  59                                         'rb.rd_from = pb.page_id',
  60                                         'pc.page_namespace = rb.rd_namespace',
  61                                         'pc.page_title = rb.rd_title' )
  62                 );
  63                 if ( $limitToTitle ) {
  64                         $retval['conds']['pa.page_namespace'] = $namespace;
  65                         $retval['conds']['pa.page_title'] = $title;
  66                 }
  67                 return $retval;
  68         }
  69
  70         function getQueryInfo() {
  71                 return $this->reallyGetQueryInfo();
  72         }
  73
  74         function getOrderFields() {
  75                 return array ( 'ra.rd_namespace', 'ra.rd_title' );
  76         }
  77
  78         function formatResult( $skin, $result ) {
  79                 global $wgContLang;
  80
  81                 $titleA = Title::makeTitle( $result->namespace, $result->title );
  82
  83                 if ( $result && !isset( $result->nsb ) ) {
  84                         $dbr = wfGetDB( DB_SLAVE );
  85                         $qi = $this->reallyGetQueryInfo( $result->namespace,
  86                                         $result->title );
  87                         $res = $dbr->select($qi['tables'], $qi['fields'],
  88                                         $qi['conds'], __METHOD__ );
  89                         if ( $res ) {
  90                                 $result = $dbr->fetchObject( $res );
  91                         }
  92                 }
  93                 if ( !$result ) {
  94                         return '<del>' . $skin->link( $titleA, null, array(), array( 'redirect' => 'no' ) ) . '</del>';
  95                 }
  96
  97                 $titleB = Title::makeTitle( $result->nsb, $result->tb );
  98                 $titleC = Title::makeTitle( $result->nsc, $result->tc );
  99
 100                 $linkA = $skin->linkKnown(
 101                         $titleA,
 102                         null,
 103                         array(),
 104                         array( 'redirect' => 'no' )
 105                 );
 106                 $edit = $skin->linkKnown(
 107                         $titleA,
 108                         wfMsgExt( 'parentheses', array( 'escape' ), wfMsg( 'editlink' ) ),
 109                         array(),
 110                         array(
 111                                 'redirect' => 'no',
 112                                 'action' => 'edit'
 113                         )
 114                 );
 115                 $linkB = $skin->linkKnown(
 116                         $titleB,
 117                         null,
 118                         array(),
 119                         array( 'redirect' => 'no' )
 120                 );
 121                 $linkC = $skin->linkKnown( $titleC );
 122                 $arr = $wgContLang->getArrow() . $wgContLang->getDirMark();
 123
 124                 return( "{$linkA} {$edit} {$arr} {$linkB} {$arr} {$linkC}" );
 125         }
 126 }