includes/specials/DoubleRedirects.php

   1 <?php
   2 /**
   3  * @file
   4  * @ingroup 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  * @ingroup 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                 return wfMsgExt( 'doubleredirectstext', array( 'parse' ) );
  23         }
  24
  25         function getSQLText( &$dbr, $namespace = null, $title = null ) {
  26
  27                 list( $page, $redirect ) = $dbr->tableNamesN( 'page', 'redirect' );
  28
  29                 $limitToTitle = !( $namespace === null && $title === null );
  30                 $sql = $limitToTitle ? "SELECT" : "SELECT 'DoubleRedirects' as type," ;
  31                 $sql .=
  32                          " pa.page_namespace as namespace, pa.page_title as title," .
  33                          " pb.page_namespace as nsb, pb.page_title as tb," .
  34                          " pc.page_namespace as nsc, pc.page_title as tc" .
  35                    " FROM $redirect AS ra, $redirect AS rb, $page AS pa, $page AS pb, $page AS pc" .
  36                    " WHERE ra.rd_from=pa.page_id" .
  37                          " AND ra.rd_namespace=pb.page_namespace" .
  38                          " AND ra.rd_title=pb.page_title" .
  39                          " AND rb.rd_from=pb.page_id" .
  40                          " AND rb.rd_namespace=pc.page_namespace" .
  41                          " AND rb.rd_title=pc.page_title";
  42
  43                 if( $limitToTitle ) {
  44                         $encTitle = $dbr->addQuotes( $title );
  45                         $sql .= " AND pa.page_namespace=$namespace" .
  46                                         " AND pa.page_title=$encTitle";
  47                 }
  48
  49                 return $sql;
  50         }
  51
  52         function getSQL() {
  53                 $dbr = wfGetDB( DB_SLAVE );
  54                 return $this->getSQLText( $dbr );
  55         }
  56
  57         function getOrder() {
  58                 return '';
  59         }
  60
  61         function formatResult( $skin, $result ) {
  62                 global $wgContLang;
  63
  64                 $fname = 'DoubleRedirectsPage::formatResult';
  65                 $titleA = Title::makeTitle( $result->namespace, $result->title );
  66
  67                 if ( $result && !isset( $result->nsb ) ) {
  68                         $dbr = wfGetDB( DB_SLAVE );
  69                         $sql = $this->getSQLText( $dbr, $result->namespace, $result->title );
  70                         $res = $dbr->query( $sql, $fname );
  71                         if ( $res ) {
  72                                 $result = $dbr->fetchObject( $res );
  73                                 $dbr->freeResult( $res );
  74                         }
  75                 }
  76                 if ( !$result ) {
  77                         return '<s>' . $skin->makeLinkObj( $titleA, '', 'redirect=no' ) . '</s>';
  78                 }
  79
  80                 $titleB = Title::makeTitle( $result->nsb, $result->tb );
  81                 $titleC = Title::makeTitle( $result->nsc, $result->tc );
  82
  83                 $linkA = $skin->makeKnownLinkObj( $titleA, '', 'redirect=no' );
  84                 $edit = $skin->makeBrokenLinkObj( $titleA, "(".wfMsg("qbedit").")" , 'redirect=no');
  85                 $linkB = $skin->makeKnownLinkObj( $titleB, '', 'redirect=no' );
  86                 $linkC = $skin->makeKnownLinkObj( $titleC );
  87                 $arr = $wgContLang->getArrow() . $wgContLang->getDirMark();
  88
  89                 return( "{$linkA} {$edit} {$arr} {$linkB} {$arr} {$linkC}" );
  90         }
  91 }
  92
  93 /**
  94  * constructor
  95  */
  96 function wfSpecialDoubleRedirects() {
  97         list( $limit, $offset ) = wfCheckLimits();
  98
  99         $sdr = new DoubleRedirectsPage();
 100
 101         return $sdr->doQuery( $offset, $limit );
 102
 103 }