includes/specials/SpecialWhatlinkshere.php

   1 <?php
   2 /**
   3  * Implements Special:Whatlinkshere
   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  * @todo Use some variant of Pager or something; the pagination here is lousy.
  22  */
  23
  24 /**
  25  * Implements Special:Whatlinkshere
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class SpecialWhatLinksHere extends SpecialPage {
  30
  31         /**
  32          * @var FormOptions
  33          */
  34         protected $opts;
  35
  36         protected $selfTitle;
  37
  38         /**
  39          * @var Title
  40          */
  41         protected $target;
  42
  43         protected $limits = array( 20, 50, 100, 250, 500 );
  44
  45         public function __construct() {
  46                 parent::__construct( 'Whatlinkshere' );
  47         }
  48
  49         function execute( $par ) {
  50                 global $wgQueryPageDefaultLimit;
  51                 $out = $this->getOutput();
  52
  53                 $this->setHeaders();
  54                 $this->outputHeader();
  55
  56                 $opts = new FormOptions();
  57
  58                 $opts->add( 'target', '' );
  59                 $opts->add( 'namespace', '', FormOptions::INTNULL );
  60                 $opts->add( 'limit', $wgQueryPageDefaultLimit );
  61                 $opts->add( 'from', 0 );
  62                 $opts->add( 'back', 0 );
  63                 $opts->add( 'hideredirs', false );
  64                 $opts->add( 'hidetrans', false );
  65                 $opts->add( 'hidelinks', false );
  66                 $opts->add( 'hideimages', false );
  67
  68                 $opts->fetchValuesFromRequest( $this->getRequest() );
  69                 $opts->validateIntBounds( 'limit', 0, 5000 );
  70
  71                 // Give precedence to subpage syntax
  72                 if ( isset( $par ) ) {
  73                         $opts->setValue( 'target', $par );
  74                 }
  75
  76                 // Bind to member variable
  77                 $this->opts = $opts;
  78
  79                 $this->target = Title::newFromURL( $opts->getValue( 'target' ) );
  80                 if ( !$this->target ) {
  81                         $out->addHTML( $this->whatlinkshereForm() );
  82                         return;
  83                 }
  84
  85                 $this->getSkin()->setRelevantTitle( $this->target );
  86
  87                 $this->selfTitle = $this->getTitle( $this->target->getPrefixedDBkey() );
  88
  89                 $out->setPageTitle( $this->msg( 'whatlinkshere-title', $this->target->getPrefixedText() ) );
  90                 $out->addBacklinkSubtitle( $this->target );
  91
  92                 $this->showIndirectLinks( 0, $this->target, $opts->getValue( 'limit' ),
  93                         $opts->getValue( 'from' ), $opts->getValue( 'back' ) );
  94         }
  95
  96         /**
  97          * @param int $level Recursion level
  98          * @param Title $target Target title
  99          * @param int $limit Number of entries to display
 100          * @param int $from Display from this article ID (default: 0)
 101          * @param int $back Display from this article ID at backwards scrolling (default: 0)
 102          */
 103         function showIndirectLinks( $level, $target, $limit, $from = 0, $back = 0 ) {
 104                 global $wgMaxRedirectLinksRetrieved;
 105                 $out = $this->getOutput();
 106                 $dbr = wfGetDB( DB_SLAVE );
 107                 $options = array();
 108
 109                 $hidelinks = $this->opts->getValue( 'hidelinks' );
 110                 $hideredirs = $this->opts->getValue( 'hideredirs' );
 111                 $hidetrans = $this->opts->getValue( 'hidetrans' );
 112                 $hideimages = $target->getNamespace() != NS_FILE || $this->opts->getValue( 'hideimages' );
 113
 114                 $fetchlinks = ( !$hidelinks || !$hideredirs );
 115
 116                 // Make the query
 117                 $plConds = array(
 118                         'page_id=pl_from',
 119                         'pl_namespace' => $target->getNamespace(),
 120                         'pl_title' => $target->getDBkey(),
 121                 );
 122                 if ( $hideredirs ) {
 123                         $plConds['rd_from'] = null;
 124                 } elseif ( $hidelinks ) {
 125                         $plConds[] = 'rd_from is NOT NULL';
 126                 }
 127
 128                 $tlConds = array(
 129                         'page_id=tl_from',
 130                         'tl_namespace' => $target->getNamespace(),
 131                         'tl_title' => $target->getDBkey(),
 132                 );
 133
 134                 $ilConds = array(
 135                         'page_id=il_from',
 136                         'il_to' => $target->getDBkey(),
 137                 );
 138
 139                 $namespace = $this->opts->getValue( 'namespace' );
 140                 if ( is_int( $namespace ) ) {
 141                         $plConds['page_namespace'] = $namespace;
 142                         $tlConds['page_namespace'] = $namespace;
 143                         $ilConds['page_namespace'] = $namespace;
 144                 }
 145
 146                 if ( $from ) {
 147                         $tlConds[] = "tl_from >= $from";
 148                         $plConds[] = "pl_from >= $from";
 149                         $ilConds[] = "il_from >= $from";
 150                 }
 151
 152                 // Read an extra row as an at-end check
 153                 $queryLimit = $limit + 1;
 154
 155                 // Enforce join order, sometimes namespace selector may
 156                 // trigger filesorts which are far less efficient than scanning many entries
 157                 $options[] = 'STRAIGHT_JOIN';
 158
 159                 $options['LIMIT'] = $queryLimit;
 160                 $fields = array( 'page_id', 'page_namespace', 'page_title', 'rd_from' );
 161
 162                 $joinConds = array( 'redirect' => array( 'LEFT JOIN', array(
 163                         'rd_from = page_id',
 164                         'rd_namespace' => $target->getNamespace(),
 165                         'rd_title' => $target->getDBkey(),
 166                         'rd_interwiki = ' . $dbr->addQuotes( '' ) . ' OR rd_interwiki IS NULL'
 167                 )));
 168
 169                 if ( $fetchlinks ) {
 170                         $options['ORDER BY'] = 'pl_from';
 171                         $plRes = $dbr->select( array( 'pagelinks', 'page', 'redirect' ), $fields,
 172                                 $plConds, __METHOD__, $options,
 173                                 $joinConds
 174                         );
 175                 }
 176
 177                 if ( !$hidetrans ) {
 178                         $options['ORDER BY'] = 'tl_from';
 179                         $tlRes = $dbr->select( array( 'templatelinks', 'page', 'redirect' ), $fields,
 180                                 $tlConds, __METHOD__, $options,
 181                                 $joinConds
 182                         );
 183                 }
 184
 185                 if ( !$hideimages ) {
 186                         $options['ORDER BY'] = 'il_from';
 187                         $ilRes = $dbr->select( array( 'imagelinks', 'page', 'redirect' ), $fields,
 188                                 $ilConds, __METHOD__, $options,
 189                                 $joinConds
 190                         );
 191                 }
 192
 193                 if ( ( !$fetchlinks || !$plRes->numRows() ) && ( $hidetrans || !$tlRes->numRows() ) && ( $hideimages || !$ilRes->numRows() ) ) {
 194                         if ( 0 == $level ) {
 195                                 $out->addHTML( $this->whatlinkshereForm() );
 196
 197                                 // Show filters only if there are links
 198                                 if ( $hidelinks || $hidetrans || $hideredirs || $hideimages ) {
 199                                         $out->addHTML( $this->getFilterPanel() );
 200                                 }
 201
 202                                 $errMsg = is_int( $namespace ) ? 'nolinkshere-ns' : 'nolinkshere';
 203                                 $out->addWikiMsg( $errMsg, $this->target->getPrefixedText() );
 204                         }
 205                         return;
 206                 }
 207
 208                 // Read the rows into an array and remove duplicates
 209                 // templatelinks comes second so that the templatelinks row overwrites the
 210                 // pagelinks row, so we get (inclusion) rather than nothing
 211                 if ( $fetchlinks ) {
 212                         foreach ( $plRes as $row ) {
 213                                 $row->is_template = 0;
 214                                 $row->is_image = 0;
 215                                 $rows[$row->page_id] = $row;
 216                         }
 217                 }
 218                 if ( !$hidetrans ) {
 219                         foreach ( $tlRes as $row ) {
 220                                 $row->is_template = 1;
 221                                 $row->is_image = 0;
 222                                 $rows[$row->page_id] = $row;
 223                         }
 224                 }
 225                 if ( !$hideimages ) {
 226                         foreach ( $ilRes as $row ) {
 227                                 $row->is_template = 0;
 228                                 $row->is_image = 1;
 229                                 $rows[$row->page_id] = $row;
 230                         }
 231                 }
 232
 233                 // Sort by key and then change the keys to 0-based indices
 234                 ksort( $rows );
 235                 $rows = array_values( $rows );
 236
 237                 $numRows = count( $rows );
 238
 239                 // Work out the start and end IDs, for prev/next links
 240                 if ( $numRows > $limit ) {
 241                         // More rows available after these ones
 242                         // Get the ID from the last row in the result set
 243                         $nextId = $rows[$limit]->page_id;
 244                         // Remove undisplayed rows
 245                         $rows = array_slice( $rows, 0, $limit );
 246                 } else {
 247                         // No more rows after
 248                         $nextId = false;
 249                 }
 250                 $prevId = $from;
 251
 252                 if ( $level == 0 ) {
 253                         $out->addHTML( $this->whatlinkshereForm() );
 254                         $out->addHTML( $this->getFilterPanel() );
 255                         $out->addWikiMsg( 'linkshere', $this->target->getPrefixedText() );
 256
 257                         $prevnext = $this->getPrevNext( $prevId, $nextId );
 258                         $out->addHTML( $prevnext );
 259                 }
 260
 261                 $out->addHTML( $this->listStart( $level ) );
 262                 foreach ( $rows as $row ) {
 263                         $nt = Title::makeTitle( $row->page_namespace, $row->page_title );
 264
 265                         if ( $row->rd_from && $level < 2 ) {
 266                                 $out->addHTML( $this->listItem( $row, $nt, true ) );
 267                                 $this->showIndirectLinks( $level + 1, $nt, $wgMaxRedirectLinksRetrieved );
 268                                 $out->addHTML( Xml::closeElement( 'li' ) );
 269                         } else {
 270                                 $out->addHTML( $this->listItem( $row, $nt ) );
 271                         }
 272                 }
 273
 274                 $out->addHTML( $this->listEnd() );
 275
 276                 if ( $level == 0 ) {
 277                         $out->addHTML( $prevnext );
 278                 }
 279         }
 280
 281         protected function listStart( $level ) {
 282                 return Xml::openElement( 'ul', ( $level ? array() : array( 'id' => 'mw-whatlinkshere-list' ) ) );
 283         }
 284
 285         protected function listItem( $row, $nt, $notClose = false ) {
 286                 $dirmark = $this->getLanguage()->getDirMark();
 287
 288                 # local message cache
 289                 static $msgcache = null;
 290                 if ( $msgcache === null ) {
 291                         static $msgs = array( 'isredirect', 'istemplate', 'semicolon-separator',
 292                                 'whatlinkshere-links', 'isimage' );
 293                         $msgcache = array();
 294                         foreach ( $msgs as $msg ) {
 295                                 $msgcache[$msg] = $this->msg( $msg )->escaped();
 296                         }
 297                 }
 298
 299                 if ( $row->rd_from ) {
 300                         $query = array( 'redirect' => 'no' );
 301                 } else {
 302                         $query = array();
 303                 }
 304
 305                 $link = Linker::linkKnown(
 306                         $nt,
 307                         null,
 308                         array(),
 309                         $query
 310                 );
 311
 312                 // Display properties (redirect or template)
 313                 $propsText = '';
 314                 $props = array();
 315                 if ( $row->rd_from ) {
 316                         $props[] = $msgcache['isredirect'];
 317                 }
 318                 if ( $row->is_template ) {
 319                         $props[] = $msgcache['istemplate'];
 320                 }
 321                 if ( $row->is_image ) {
 322                         $props[] = $msgcache['isimage'];
 323                 }
 324
 325                 if ( count( $props ) ) {
 326                         $propsText = $this->msg( 'parentheses' )->rawParams( implode( $msgcache['semicolon-separator'], $props ) )->escaped();
 327                 }
 328
 329                 # Space for utilities links, with a what-links-here link provided
 330                 $wlhLink = $this->wlhLink( $nt, $msgcache['whatlinkshere-links'] );
 331                 $wlh = Xml::wrapClass( $this->msg( 'parentheses' )->rawParams( $wlhLink )->escaped(), 'mw-whatlinkshere-tools' );
 332
 333                 return $notClose ?
 334                         Xml::openElement( 'li' ) . "$link $propsText $dirmark $wlh\n" :
 335                         Xml::tags( 'li', null, "$link $propsText $dirmark $wlh" ) . "\n";
 336         }
 337
 338         protected function listEnd() {
 339                 return Xml::closeElement( 'ul' );
 340         }
 341
 342         protected function wlhLink( Title $target, $text ) {
 343                 static $title = null;
 344                 if ( $title === null ) {
 345                         $title = $this->getTitle();
 346                 }
 347
 348                 return Linker::linkKnown(
 349                         $title,
 350                         $text,
 351                         array(),
 352                         array( 'target' => $target->getPrefixedText() )
 353                 );
 354         }
 355
 356         function makeSelfLink( $text, $query ) {
 357                 return Linker::linkKnown(
 358                         $this->selfTitle,
 359                         $text,
 360                         array(),
 361                         $query
 362                 );
 363         }
 364
 365         function getPrevNext( $prevId, $nextId ) {
 366                 $currentLimit = $this->opts->getValue( 'limit' );
 367                 $prev = $this->msg( 'whatlinkshere-prev' )->numParams( $currentLimit )->escaped();
 368                 $next = $this->msg( 'whatlinkshere-next' )->numParams( $currentLimit )->escaped();
 369
 370                 $changed = $this->opts->getChangedValues();
 371                 unset( $changed['target'] ); // Already in the request title
 372
 373                 if ( 0 != $prevId ) {
 374                         $overrides = array( 'from' => $this->opts->getValue( 'back' ) );
 375                         $prev = $this->makeSelfLink( $prev, array_merge( $changed, $overrides ) );
 376                 }
 377                 if ( 0 != $nextId ) {
 378                         $overrides = array( 'from' => $nextId, 'back' => $prevId );
 379                         $next = $this->makeSelfLink( $next, array_merge( $changed, $overrides ) );
 380                 }
 381
 382                 $limitLinks = array();
 383                 $lang = $this->getLanguage();
 384                 foreach ( $this->limits as $limit ) {
 385                         $prettyLimit = htmlspecialchars( $lang->formatNum( $limit ) );
 386                         $overrides = array( 'limit' => $limit );
 387                         $limitLinks[] = $this->makeSelfLink( $prettyLimit, array_merge( $changed, $overrides ) );
 388                 }
 389
 390                 $nums = $lang->pipeList( $limitLinks );
 391
 392                 return $this->msg( 'viewprevnext' )->rawParams( $prev, $next, $nums )->escaped();
 393         }
 394
 395         function whatlinkshereForm() {
 396                 global $wgScript;
 397
 398                 // We get nicer value from the title object
 399                 $this->opts->consumeValue( 'target' );
 400                 // Reset these for new requests
 401                 $this->opts->consumeValues( array( 'back', 'from' ) );
 402
 403                 $target = $this->target ? $this->target->getPrefixedText() : '';
 404                 $namespace = $this->opts->consumeValue( 'namespace' );
 405
 406                 # Build up the form
 407                 $f = Xml::openElement( 'form', array( 'action' => $wgScript ) );
 408
 409                 # Values that should not be forgotten
 410                 $f .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() );
 411                 foreach ( $this->opts->getUnconsumedValues() as $name => $value ) {
 412                         $f .= Html::hidden( $name, $value );
 413                 }
 414
 415                 $f .= Xml::fieldset( $this->msg( 'whatlinkshere' )->text() );
 416
 417                 # Target input
 418                 $f .= Xml::inputLabel( $this->msg( 'whatlinkshere-page' )->text(), 'target',
 419                                 'mw-whatlinkshere-target', 40, $target );
 420
 421                 $f .= ' ';
 422
 423                 # Namespace selector
 424                 $f .= Html::namespaceSelector(
 425                         array(
 426                                 'selected' => $namespace,
 427                                 'all' => '',
 428                                 'label' => $this->msg( 'namespace' )->text()
 429                         ), array(
 430                                 'name' => 'namespace',
 431                                 'id' => 'namespace',
 432                                 'class' => 'namespaceselector',
 433                         )
 434                 );
 435
 436                 $f .= ' ';
 437
 438                 # Submit
 439                 $f .= Xml::submitButton( $this->msg( 'allpagessubmit' )->text() );
 440
 441                 # Close
 442                 $f .= Xml::closeElement( 'fieldset' ) . Xml::closeElement( 'form' ) . "\n";
 443
 444                 return $f;
 445         }
 446
 447         /**
 448          * Create filter panel
 449          *
 450          * @return string HTML fieldset and filter panel with the show/hide links
 451          */
 452         function getFilterPanel() {
 453                 $show = $this->msg( 'show' )->escaped();
 454                 $hide = $this->msg( 'hide' )->escaped();
 455
 456                 $changed = $this->opts->getChangedValues();
 457                 unset( $changed['target'] ); // Already in the request title
 458
 459                 $links = array();
 460                 $types = array( 'hidetrans', 'hidelinks', 'hideredirs' );
 461                 if ( $this->target->getNamespace() == NS_FILE ) {
 462                         $types[] = 'hideimages';
 463                 }
 464
 465                 // Combined message keys: 'whatlinkshere-hideredirs', 'whatlinkshere-hidetrans', 'whatlinkshere-hidelinks', 'whatlinkshere-hideimages'
 466                 // To be sure they will be found by grep
 467                 foreach ( $types as $type ) {
 468                         $chosen = $this->opts->getValue( $type );
 469                         $msg = $chosen ? $show : $hide;
 470                         $overrides = array( $type => !$chosen );
 471                         $links[] = $this->msg( "whatlinkshere-{$type}" )->rawParams(
 472                                 $this->makeSelfLink( $msg, array_merge( $changed, $overrides ) ) )->escaped();
 473                 }
 474                 return Xml::fieldset( $this->msg( 'whatlinkshere-filters' )->text(), $this->getLanguage()->pipeList( $links ) );
 475         }
 476
 477         protected function getGroupName() {
 478                 return 'pagetools';
 479         }
 480 }