includes/specials/SpecialDoubleRedirects.php

   1 <?php
   2 /**
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  17  * http://www.gnu.org/copyleft/gpl.html
  18  */
  19
  20 /**
  21  * A special page listing redirects to redirecting page.
  22  * The software will automatically not follow double redirects, to prevent loops.
  23  *
  24  * @file
  25  * @ingroup SpecialPage
  26  */
  27 class DoubleRedirectsPage extends PageQueryPage {
  28
  29         function getName() {
  30                 return 'DoubleRedirects';
  31         }
  32
  33         function isExpensive( ) { return true; }
  34         function isSyndicated() { return false; }
  35
  36         function getPageHeader( ) {
  37                 return wfMsgExt( 'doubleredirectstext', array( 'parse' ) );
  38         }
  39
  40         function getSQLText( &$dbr, $namespace = null, $title = null ) {
  41
  42                 list( $page, $redirect ) = $dbr->tableNamesN( 'page', 'redirect' );
  43
  44                 $limitToTitle = !( $namespace === null && $title === null );
  45                 $sql = $limitToTitle ? "SELECT" : "SELECT 'DoubleRedirects' as type," ;
  46                 $sql .=
  47                          " pa.page_namespace as namespace, pa.page_title as title," .
  48                          " pb.page_namespace as nsb, pb.page_title as tb," .
  49                          " pc.page_namespace as nsc, pc.page_title as tc" .
  50                    " FROM $redirect AS ra, $redirect AS rb, $page AS pa, $page AS pb, $page AS pc" .
  51                    " WHERE ra.rd_from=pa.page_id" .
  52                          " AND ra.rd_namespace=pb.page_namespace" .
  53                          " AND ra.rd_title=pb.page_title" .
  54                          " AND rb.rd_from=pb.page_id" .
  55                          " AND rb.rd_namespace=pc.page_namespace" .
  56                          " AND rb.rd_title=pc.page_title";
  57
  58                 if( $limitToTitle ) {
  59                         $encTitle = $dbr->addQuotes( $title );
  60                         $sql .= " AND pa.page_namespace=$namespace" .
  61                                         " AND pa.page_title=$encTitle";
  62                 }
  63
  64                 return $sql;
  65         }
  66
  67         function getSQL() {
  68                 $dbr = wfGetDB( DB_SLAVE );
  69                 return $this->getSQLText( $dbr );
  70         }
  71
  72         function getOrder() {
  73                 return '';
  74         }
  75
  76         function formatResult( $skin, $result ) {
  77                 global $wgContLang;
  78
  79                 $fname = 'DoubleRedirectsPage::formatResult';
  80                 $titleA = Title::makeTitle( $result->namespace, $result->title );
  81
  82                 if ( $result && !isset( $result->nsb ) ) {
  83                         $dbr = wfGetDB( DB_SLAVE );
  84                         $sql = $this->getSQLText( $dbr, $result->namespace, $result->title );
  85                         $res = $dbr->query( $sql, $fname );
  86                         if ( $res ) {
  87                                 $result = $dbr->fetchObject( $res );
  88                         }
  89                 }
  90                 if ( !$result ) {
  91                         return '<del>' . $skin->link( $titleA, null, array(), array( 'redirect' => 'no' ) ) . '</del>';
  92                 }
  93
  94                 $titleB = Title::makeTitle( $result->nsb, $result->tb );
  95                 $titleC = Title::makeTitle( $result->nsc, $result->tc );
  96
  97                 $linkA = $skin->linkKnown(
  98                         $titleA,
  99                         null,
 100                         array(),
 101                         array( 'redirect' => 'no' )
 102                 );
 103                 $edit = $skin->linkKnown(
 104                         $titleA,
 105                         wfMsgExt( 'parentheses', array( 'escape' ), wfMsg( 'editlink' ) ),
 106                         array(),
 107                         array(
 108                                 'redirect' => 'no',
 109                                 'action' => 'edit'
 110                         )
 111                 );
 112                 $linkB = $skin->linkKnown(
 113                         $titleB,
 114                         null,
 115                         array(),
 116                         array( 'redirect' => 'no' )
 117                 );
 118                 $linkC = $skin->linkKnown( $titleC );
 119                 $arr = $wgContLang->getArrow() . $wgContLang->getDirMark();
 120
 121                 return( "{$linkA} {$edit} {$arr} {$linkB} {$arr} {$linkC}" );
 122         }
 123 }
 124
 125 /**
 126  * constructor
 127  */
 128 function wfSpecialDoubleRedirects() {
 129         list( $limit, $offset ) = wfCheckLimits();
 130
 131         $sdr = new DoubleRedirectsPage();
 132
 133         return $sdr->doQuery( $offset, $limit );
 134
 135 }