includes/specials/SpecialDisambiguations.php

   1 <?php
   2 /**
   3  * Implements Special:Disambiguations
   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 that lists pages containing links to disambiguations pages
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class DisambiguationsPage extends PageQueryPage {
  30
  31         function __construct( $name = 'Disambiguations' ) {
  32                 parent::__construct( $name );
  33         }
  34
  35         function isExpensive() { return true; }
  36         function isSyndicated() { return false; }
  37
  38         function getPageHeader() {
  39                 return $this->msg( 'disambiguations-text' )->parseAsBlock();
  40         }
  41
  42         function getQueryInfo() {
  43                 $dbr = wfGetDB( DB_SLAVE );
  44                 $dMsgText = $this->msg( 'disambiguationspage' )->inContentLanguage()->text();
  45                 $linkBatch = new LinkBatch;
  46
  47                 # If the text can be treated as a title, use it verbatim.
  48                 # Otherwise, pull the titles from the links table
  49                 $dp = Title::newFromText($dMsgText);
  50                 if( $dp ) {
  51                         if( $dp->getNamespace() != NS_TEMPLATE ) {
  52                                 # @todo FIXME: We assume the disambiguation message is a template but
  53                                 # the page can potentially be from another namespace :/
  54                                 wfDebug("Mediawiki:disambiguationspage message does not refer to a template!\n");
  55                         }
  56                         $linkBatch->addObj( $dp );
  57                 } else {
  58                                 # Get all the templates linked from the Mediawiki:Disambiguationspage
  59                                 $disPageObj = Title::makeTitleSafe( NS_MEDIAWIKI, 'disambiguationspage' );
  60                                 $res = $dbr->select(
  61                                         array('pagelinks', 'page'),
  62                                         'pl_title',
  63                                         array('page_id = pl_from',
  64                                                 'pl_namespace' => NS_TEMPLATE,
  65                                                 'page_namespace' => $disPageObj->getNamespace(),
  66                                                 'page_title' => $disPageObj->getDBkey()),
  67                                         __METHOD__ );
  68
  69                                 foreach ( $res as $row ) {
  70                                         $linkBatch->addObj( Title::makeTitle( NS_TEMPLATE, $row->pl_title ));
  71                                 }
  72                 }
  73                 $set = $linkBatch->constructSet( 'tl', $dbr );
  74                 if( $set === false ) {
  75                         # We must always return a valid SQL query, but this way
  76                         # the DB will always quickly return an empty result
  77                         $set = 'FALSE';
  78                         wfDebug("Mediawiki:disambiguationspage message does not link to any templates!\n");
  79                 }
  80
  81                 // @todo FIXME: What are pagelinks and p2 doing here?
  82                 return array (
  83                         'tables' => array( 'templatelinks', 'p1' => 'page', 'pagelinks', 'p2' => 'page' ),
  84                         'fields' => array( 'p1.page_namespace AS namespace',
  85                                         'p1.page_title AS title',
  86                                         'pl_from AS value' ),
  87                         'conds' => array( $set,
  88                                         'p1.page_id = tl_from',
  89                                         'pl_namespace = p1.page_namespace',
  90                                         'pl_title = p1.page_title',
  91                                         'p2.page_id = pl_from',
  92                                         'p2.page_namespace' => MWNamespace::getContentNamespaces() )
  93                 );
  94         }
  95
  96         function getOrderFields() {
  97                 return array( 'tl_namespace', 'tl_title', 'value' );
  98         }
  99
 100         function sortDescending() {
 101                 return false;
 102         }
 103
 104         /**
 105          * Fetch links and cache their existence
 106          *
 107          * @param $db DatabaseBase
 108          * @param $res
 109          */
 110         function preprocessResults( $db, $res ) {
 111                 if ( !$res->numRows() ) {
 112                         return;
 113                 }
 114
 115                 $batch = new LinkBatch;
 116                 foreach ( $res as $row ) {
 117                         $batch->add( $row->namespace, $row->title );
 118                 }
 119                 $batch->execute();
 120
 121                 $res->seek( 0 );
 122         }
 123
 124         function formatResult( $skin, $result ) {
 125                 $title = Title::newFromID( $result->value );
 126                 $dp = Title::makeTitle( $result->namespace, $result->title );
 127
 128                 $from = Linker::link( $title );
 129                 $edit = Linker::link( $title, $this->msg( 'parentheses', $this->msg( 'editlink' )->text() )->escaped(),
 130                         array(), array( 'redirect' => 'no', 'action' => 'edit' ) );
 131                 $arr  = $this->getLanguage()->getArrow();
 132                 $to   = Linker::link( $dp );
 133
 134                 return "$from $edit $arr $to";
 135         }
 136 }