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 getName() {
  33                 return 'DoubleRedirects';
  34         }
  35
  36         function isExpensive( ) { return true; }
  37         function isSyndicated() { return false; }
  38
  39         function getPageHeader( ) {
  40                 return wfMsgExt( 'doubleredirectstext', array( 'parse' ) );
  41         }
  42
  43         function getSQLText( &$dbr, $namespace = null, $title = null ) {
  44
  45                 list( $page, $redirect ) = $dbr->tableNamesN( 'page', 'redirect' );
  46
  47                 $limitToTitle = !( $namespace === null && $title === null );
  48                 $sql = $limitToTitle ? "SELECT" : "SELECT 'DoubleRedirects' as type," ;
  49                 $sql .=
  50                          " pa.page_namespace as namespace, pa.page_title as title," .
  51                          " pb.page_namespace as nsb, pb.page_title as tb," .
  52                          " pc.page_namespace as nsc, pc.page_title as tc" .
  53                    " FROM $redirect AS ra, $redirect AS rb, $page AS pa, $page AS pb, $page AS pc" .
  54                    " WHERE ra.rd_from=pa.page_id" .
  55                          " AND ra.rd_namespace=pb.page_namespace" .
  56                          " AND ra.rd_title=pb.page_title" .
  57                          " AND rb.rd_from=pb.page_id" .
  58                          " AND rb.rd_namespace=pc.page_namespace" .
  59                          " AND rb.rd_title=pc.page_title";
  60
  61                 if( $limitToTitle ) {
  62                         $encTitle = $dbr->addQuotes( $title );
  63                         $sql .= " AND pa.page_namespace=$namespace" .
  64                                         " AND pa.page_title=$encTitle";
  65                 }
  66
  67                 return $sql;
  68         }
  69
  70         function getSQL() {
  71                 $dbr = wfGetDB( DB_SLAVE );
  72                 return $this->getSQLText( $dbr );
  73         }
  74
  75         function getOrder() {
  76                 return '';
  77         }
  78
  79         function formatResult( $skin, $result ) {
  80                 global $wgContLang;
  81
  82                 $fname = 'DoubleRedirectsPage::formatResult';
  83                 $titleA = Title::makeTitle( $result->namespace, $result->title );
  84
  85                 if ( $result && !isset( $result->nsb ) ) {
  86                         $dbr = wfGetDB( DB_SLAVE );
  87                         $sql = $this->getSQLText( $dbr, $result->namespace, $result->title );
  88                         $res = $dbr->query( $sql, $fname );
  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 }
 127
 128 /**
 129  * constructor
 130  */
 131 function wfSpecialDoubleRedirects() {
 132         list( $limit, $offset ) = wfCheckLimits();
 133
 134         $sdr = new DoubleRedirectsPage();
 135
 136         return $sdr->doQuery( $offset, $limit );
 137
 138 }