3 * Implements Special:DoubleRedirects
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.
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.
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
21 * @ingroup SpecialPage
24 use Wikimedia\Rdbms\ResultWrapper
;
25 use Wikimedia\Rdbms\IDatabase
;
28 * A special page listing redirects to redirecting page.
29 * The software will automatically not follow double redirects, to prevent loops.
31 * @ingroup SpecialPage
33 class DoubleRedirectsPage
extends QueryPage
{
34 function __construct( $name = 'DoubleRedirects' ) {
35 parent
::__construct( $name );
38 public function isExpensive() {
42 function isSyndicated() {
46 function sortDescending() {
50 function getPageHeader() {
51 return $this->msg( 'doubleredirectstext' )->parseAsBlock();
54 function reallyGetQueryInfo( $namespace = null, $title = null ) {
55 $limitToTitle = !( $namespace === null && $title === null );
56 $dbr = wfGetDB( DB_REPLICA
);
65 'namespace' => 'pa.page_namespace',
66 'title' => 'pa.page_title',
67 'value' => 'pa.page_title',
69 'nsb' => 'pb.page_namespace',
70 'tb' => 'pb.page_title',
72 // Select fields from redirect instead of page. Because there may
73 // not actually be a page table row for this target (e.g. for interwiki redirects)
74 'nsc' => 'rb.rd_namespace',
75 'tc' => 'rb.rd_title',
76 'iwc' => 'rb.rd_interwiki',
79 'ra.rd_from = pa.page_id',
81 // Filter out redirects where the target goes interwiki (T42353).
82 // This isn't an optimization, it is required for correct results,
83 // otherwise a non-double redirect like Bar -> w:Foo will show up
84 // like "Bar -> Foo -> w:Foo".
86 // Need to check both NULL and "" for some reason,
87 // apparently either can be stored for non-iw entries.
88 'ra.rd_interwiki IS NULL OR ra.rd_interwiki = ' . $dbr->addQuotes( '' ),
90 'pb.page_namespace = ra.rd_namespace',
91 'pb.page_title = ra.rd_title',
93 'rb.rd_from = pb.page_id',
97 if ( $limitToTitle ) {
98 $retval['conds']['pa.page_namespace'] = $namespace;
99 $retval['conds']['pa.page_title'] = $title;
105 public function getQueryInfo() {
106 return $this->reallyGetQueryInfo();
109 function getOrderFields() {
110 return [ 'ra.rd_namespace', 'ra.rd_title' ];
115 * @param object $result Result row
118 function formatResult( $skin, $result ) {
119 $titleA = Title
::makeTitle( $result->namespace, $result->title
);
121 // If only titleA is in the query, it means this came from
122 // querycache (which only saves 3 columns).
123 // That does save the bulk of the query cost, but now we need to
124 // get a little more detail about each individual entry quickly
125 // using the filter of reallyGetQueryInfo.
126 if ( $result && !isset( $result->nsb
) ) {
127 $dbr = wfGetDB( DB_REPLICA
);
128 $qi = $this->reallyGetQueryInfo(
140 $result = $dbr->fetchObject( $res );
143 $linkRenderer = $this->getLinkRenderer();
145 return '<del>' . $linkRenderer->makeLink( $titleA, null, [], [ 'redirect' => 'no' ] ) . '</del>';
148 $titleB = Title
::makeTitle( $result->nsb
, $result->tb
);
149 $titleC = Title
::makeTitle( $result->nsc
, $result->tc
, '', $result->iwc
);
151 $linkA = $linkRenderer->makeKnownLink(
155 [ 'redirect' => 'no' ]
158 // if the page is editable, add an edit link
160 // check user permissions
161 $this->getUser()->isAllowed( 'edit' ) &&
162 // check, if the content model is editable through action=edit
163 ContentHandler
::getForTitle( $titleA )->supportsDirectEditing()
165 $edit = $linkRenderer->makeKnownLink(
167 $this->msg( 'parentheses', $this->msg( 'editlink' )->text() )->text(),
169 [ 'action' => 'edit' ]
175 $linkB = $linkRenderer->makeKnownLink(
179 [ 'redirect' => 'no' ]
182 $linkC = $linkRenderer->makeKnownLink( $titleC );
184 $lang = $this->getLanguage();
185 $arr = $lang->getArrow() . $lang->getDirMark();
187 return ( "{$linkA} {$edit} {$arr} {$linkB} {$arr} {$linkC}" );
191 * Cache page content model and gender distinction for performance
193 * @param IDatabase $db
194 * @param ResultWrapper $res
196 function preprocessResults( $db, $res ) {
197 if ( !$res->numRows() ) {
201 $batch = new LinkBatch
;
202 foreach ( $res as $row ) {
203 $batch->add( $row->namespace, $row->title
);
204 if ( isset( $row->nsb
) ) {
205 // lazy loaded when using cached results
206 $batch->add( $row->nsb
, $row->tb
);
208 if ( isset( $row->iwc
) && !$row->iwc
) {
209 // lazy loaded when using cached result, not added when interwiki link
210 $batch->add( $row->nsc
, $row->tc
);
215 // Back to start for display
219 protected function getGroupName() {
220 return 'maintenance';