includes/SpecialDoubleRedirects.php

   1 <?php
   2 /**
   3  *
   4  * @addtogroup SpecialPage
   5  */
   6
   7 /**
   8  * A special page listing redirects to redirecting page.
   9  * The software will automatically not follow double redirects, to prevent loops.
  10  * @addtogroup SpecialPage
  11  */
  12 class DoubleRedirectsPage extends PageQueryPage {
  13
  14         function getName() {
  15                 return 'DoubleRedirects';
  16         }
  17
  18         function isExpensive( ) { return true; }
  19         function isSyndicated() { return false; }
  20
  21         function getPageHeader( ) {
  22                 #FIXME : probably need to add a backlink to the maintenance page.
  23                 return '<p>'.wfMsg("doubleredirectstext")."</p><br />\n";
  24         }
  25
  26         function getSQLText( &$dbr, $namespace = null, $title = null ) {
  27
  28                 list( $page, $redirect ) = $dbr->tableNamesN( 'page', 'redirect' );
  29
  30                 $limitToTitle = !( $namespace === null && $title === null );
  31                 $sql = $limitToTitle ? "SELECT" : "SELECT 'DoubleRedirects' as type," ;
  32                 $sql .=
  33                          " pa.page_namespace as namespace, pa.page_title as title," .
  34                          " pb.page_namespace as nsb, pb.page_title as tb," .
  35                          " pc.page_namespace as nsc, pc.page_title as tc" .
  36                    " FROM $redirect AS ra, $redirect AS rb, $page AS pa, $page AS pb, $page AS pc" .
  37                    " WHERE ra.rd_from=pa.page_id" .
  38                          " AND ra.rd_namespace=pb.page_namespace" .
  39                          " AND ra.rd_title=pb.page_title" .
  40                          " AND rb.rd_from=pb.page_id" .
  41                          " AND rb.rd_namespace=pc.page_namespace" .
  42                          " AND rb.rd_title=pc.page_title";
  43
  44                 if( $limitToTitle ) {
  45                         $encTitle = $dbr->addQuotes( $title );
  46                         $sql .= " AND pa.page_namespace=$namespace" .
  47                                         " AND pa.page_title=$encTitle";
  48                 }
  49
  50                 return $sql;
  51         }
  52
  53         function getSQL() {
  54                 $dbr = wfGetDB( DB_SLAVE );
  55                 return $this->getSQLText( $dbr );
  56         }
  57
  58         function getOrder() {
  59                 return '';
  60         }
  61
  62         function formatResult( $skin, $result ) {
  63                 global $wgContLang;
  64
  65                 $fname = 'DoubleRedirectsPage::formatResult';
  66                 $titleA = Title::makeTitle( $result->namespace, $result->title );
  67
  68                 if ( $result && !isset( $result->nsb ) ) {
  69                         $dbr = wfGetDB( DB_SLAVE );
  70                         $sql = $this->getSQLText( $dbr, $result->namespace, $result->title );
  71                         $res = $dbr->query( $sql, $fname );
  72                         if ( $res ) {
  73                                 $result = $dbr->fetchObject( $res );
  74                                 $dbr->freeResult( $res );
  75                         }
  76                 }
  77                 if ( !$result ) {
  78                         return '';
  79                 }
  80
  81                 $titleB = Title::makeTitle( $result->nsb, $result->tb );
  82                 $titleC = Title::makeTitle( $result->nsc, $result->tc );
  83
  84                 $linkA = $skin->makeKnownLinkObj( $titleA,'', 'redirect=no' );
  85                 $edit = $skin->makeBrokenLinkObj( $titleA, "(".wfMsg("qbedit").")" , 'redirect=no');
  86                 $linkB = $skin->makeKnownLinkObj( $titleB, '', 'redirect=no' );
  87                 $linkC = $skin->makeKnownLinkObj( $titleC );
  88                 $arr = $wgContLang->getArrow() . $wgContLang->getDirMark();
  89
  90                 return( "{$linkA} {$edit} {$arr} {$linkB} {$arr} {$linkC}" );
  91         }
  92 }
  93
  94 /**
  95  * constructor
  96  */
  97 function wfSpecialDoubleRedirects() {
  98         list( $limit, $offset ) = wfCheckLimits();
  99
 100         $sdr = new DoubleRedirectsPage();
 101
 102         return $sdr->doQuery( $offset, $limit );
 103
 104 }
 105 ?>