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
;
27 * A special page listing redirects to redirecting page.
28 * The software will automatically not follow double redirects, to prevent loops.
30 * @ingroup SpecialPage
32 class DoubleRedirectsPage
extends QueryPage
{
33 function __construct( $name = 'DoubleRedirects' ) {
34 parent
::__construct( $name );
37 public function isExpensive() {
41 function isSyndicated() {
45 function sortDescending() {
49 function getPageHeader() {
50 return $this->msg( 'doubleredirectstext' )->parseAsBlock();
53 function reallyGetQueryInfo( $namespace = null, $title = null ) {
54 $limitToTitle = !( $namespace === null && $title === null );
55 $dbr = wfGetDB( DB_REPLICA
);
64 'namespace' => 'pa.page_namespace',
65 'title' => 'pa.page_title',
66 'value' => 'pa.page_title',
68 'nsb' => 'pb.page_namespace',
69 'tb' => 'pb.page_title',
71 // Select fields from redirect instead of page. Because there may
72 // not actually be a page table row for this target (e.g. for interwiki redirects)
73 'nsc' => 'rb.rd_namespace',
74 'tc' => 'rb.rd_title',
75 'iwc' => 'rb.rd_interwiki',
78 'ra.rd_from = pa.page_id',
80 // Filter out redirects where the target goes interwiki (T42353).
81 // This isn't an optimization, it is required for correct results,
82 // otherwise a non-double redirect like Bar -> w:Foo will show up
83 // like "Bar -> Foo -> w:Foo".
85 // Need to check both NULL and "" for some reason,
86 // apparently either can be stored for non-iw entries.
87 'ra.rd_interwiki IS NULL OR ra.rd_interwiki = ' . $dbr->addQuotes( '' ),
89 'pb.page_namespace = ra.rd_namespace',
90 'pb.page_title = ra.rd_title',
92 'rb.rd_from = pb.page_id',
96 if ( $limitToTitle ) {
97 $retval['conds']['pa.page_namespace'] = $namespace;
98 $retval['conds']['pa.page_title'] = $title;
104 public function getQueryInfo() {
105 return $this->reallyGetQueryInfo();
108 function getOrderFields() {
109 return [ 'ra.rd_namespace', 'ra.rd_title' ];
114 * @param object $result Result row
117 function formatResult( $skin, $result ) {
118 $titleA = Title
::makeTitle( $result->namespace, $result->title
);
120 // If only titleA is in the query, it means this came from
121 // querycache (which only saves 3 columns).
122 // That does save the bulk of the query cost, but now we need to
123 // get a little more detail about each individual entry quickly
124 // using the filter of reallyGetQueryInfo.
125 if ( $result && !isset( $result->nsb
) ) {
126 $dbr = wfGetDB( DB_REPLICA
);
127 $qi = $this->reallyGetQueryInfo(
139 $result = $dbr->fetchObject( $res );
142 $linkRenderer = $this->getLinkRenderer();
144 return '<del>' . $linkRenderer->makeLink( $titleA, null, [], [ 'redirect' => 'no' ] ) . '</del>';
147 $titleB = Title
::makeTitle( $result->nsb
, $result->tb
);
148 $titleC = Title
::makeTitle( $result->nsc
, $result->tc
, '', $result->iwc
);
150 $linkA = $linkRenderer->makeKnownLink(
154 [ 'redirect' => 'no' ]
157 // if the page is editable, add an edit link
159 // check user permissions
160 $this->getUser()->isAllowed( 'edit' ) &&
161 // check, if the content model is editable through action=edit
162 ContentHandler
::getForTitle( $titleA )->supportsDirectEditing()
164 $edit = $linkRenderer->makeKnownLink(
166 $this->msg( 'parentheses', $this->msg( 'editlink' )->text() )->text(),
168 [ 'action' => 'edit' ]
174 $linkB = $linkRenderer->makeKnownLink(
178 [ 'redirect' => 'no' ]
181 $linkC = $linkRenderer->makeKnownLink( $titleC );
183 $lang = $this->getLanguage();
184 $arr = $lang->getArrow() . $lang->getDirMark();
186 return ( "{$linkA} {$edit} {$arr} {$linkB} {$arr} {$linkC}" );
190 * Cache page content model and gender distinction for performance
192 * @param IDatabase $db
193 * @param ResultWrapper $res
195 function preprocessResults( $db, $res ) {
196 if ( !$res->numRows() ) {
200 $batch = new LinkBatch
;
201 foreach ( $res as $row ) {
202 $batch->add( $row->namespace, $row->title
);
203 if ( isset( $row->nsb
) ) {
204 // lazy loaded when using cached results
205 $batch->add( $row->nsb
, $row->tb
);
207 if ( isset( $row->iwc
) && !$row->iwc
) {
208 // lazy loaded when using cached result, not added when interwiki link
209 $batch->add( $row->nsc
, $row->tc
);
214 // Back to start for display
218 protected function getGroupName() {
219 return 'maintenance';