includes/specials/SpecialEditWatchlist.php

   1 <?php
   2 /**
   3  * @defgroup Watchlist Users watchlist handling
   4  */
   5
   6 /**
   7  * Implements Special:EditWatchlist
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  * @ingroup SpecialPage
  26  * @ingroup Watchlist
  27  */
  28
  29 /**
  30  * Provides the UI through which users can perform editing
  31  * operations on their watchlist
  32  *
  33  * @ingroup SpecialPage
  34  * @ingroup Watchlist
  35  * @author Rob Church <robchur@gmail.com>
  36  */
  37 class SpecialEditWatchlist extends UnlistedSpecialPage {
  38         /**
  39          * Editing modes. EDIT_CLEAR is no longer used; the "Clear" link scared people
  40          * too much. Now it's passed on to the raw editor, from which it's very easy to clear.
  41          */
  42         const EDIT_CLEAR = 1;
  43         const EDIT_RAW = 2;
  44         const EDIT_NORMAL = 3;
  45
  46         protected $successMessage;
  47
  48         protected $toc;
  49
  50         private $badItems = array();
  51
  52         public function __construct() {
  53                 parent::__construct( 'EditWatchlist', 'editmywatchlist' );
  54         }
  55
  56         /**
  57          * Main execution point
  58          *
  59          * @param int $mode
  60          */
  61         public function execute( $mode ) {
  62                 $this->setHeaders();
  63
  64                 # Anons don't get a watchlist
  65                 $this->requireLogin( 'watchlistanontext' );
  66
  67                 $out = $this->getOutput();
  68
  69                 $this->checkPermissions();
  70                 $this->checkReadOnly();
  71
  72                 $this->outputHeader();
  73
  74                 $out->addSubtitle( $this->msg( 'watchlistfor2', $this->getUser()->getName() )
  75                         ->rawParams( SpecialEditWatchlist::buildTools( null ) ) );
  76
  77                 # B/C: $mode used to be waaay down the parameter list, and the first parameter
  78                 # was $wgUser
  79                 if ( $mode instanceof User ) {
  80                         $args = func_get_args();
  81                         if ( count( $args ) >= 4 ) {
  82                                 $mode = $args[3];
  83                         }
  84                 }
  85                 $mode = self::getMode( $this->getRequest(), $mode );
  86
  87                 switch ( $mode ) {
  88                         case self::EDIT_RAW:
  89                                 $out->setPageTitle( $this->msg( 'watchlistedit-raw-title' ) );
  90                                 $form = $this->getRawForm();
  91                                 if ( $form->show() ) {
  92                                         $out->addHTML( $this->successMessage );
  93                                         $out->addReturnTo( SpecialPage::getTitleFor( 'Watchlist' ) );
  94                                 }
  95                                 break;
  96                         case self::EDIT_CLEAR:
  97                                 $out->setPageTitle( $this->msg( 'watchlistedit-clear-title' ) );
  98                                 $form = $this->getClearForm();
  99                                 if ( $form->show() ) {
 100                                         $out->addHTML( $this->successMessage );
 101                                         $out->addReturnTo( SpecialPage::getTitleFor( 'Watchlist' ) );
 102                                 }
 103                                 break;
 104
 105                         case self::EDIT_NORMAL:
 106                         default:
 107                                 $out->setPageTitle( $this->msg( 'watchlistedit-normal-title' ) );
 108                                 $form = $this->getNormalForm();
 109                                 if ( $form->show() ) {
 110                                         $out->addHTML( $this->successMessage );
 111                                         $out->addReturnTo( SpecialPage::getTitleFor( 'Watchlist' ) );
 112                                 } elseif ( $this->toc !== false ) {
 113                                         $out->prependHTML( $this->toc );
 114                                         $out->addModules( 'mediawiki.toc' );
 115                                 }
 116                                 break;
 117                 }
 118         }
 119
 120         /**
 121          * Extract a list of titles from a blob of text, returning
 122          * (prefixed) strings; unwatchable titles are ignored
 123          *
 124          * @param string $list
 125          * @return array
 126          */
 127         private function extractTitles( $list ) {
 128                 $list = explode( "\n", trim( $list ) );
 129                 if ( !is_array( $list ) ) {
 130                         return array();
 131                 }
 132
 133                 $titles = array();
 134
 135                 foreach ( $list as $text ) {
 136                         $text = trim( $text );
 137                         if ( strlen( $text ) > 0 ) {
 138                                 $title = Title::newFromText( $text );
 139                                 if ( $title instanceof Title && $title->isWatchable() ) {
 140                                         $titles[] = $title;
 141                                 }
 142                         }
 143                 }
 144
 145                 GenderCache::singleton()->doTitlesArray( $titles );
 146
 147                 $list = array();
 148                 /** @var Title $title */
 149                 foreach ( $titles as $title ) {
 150                         $list[] = $title->getPrefixedText();
 151                 }
 152
 153                 return array_unique( $list );
 154         }
 155
 156         public function submitRaw( $data ) {
 157                 $wanted = $this->extractTitles( $data['Titles'] );
 158                 $current = $this->getWatchlist();
 159
 160                 if ( count( $wanted ) > 0 ) {
 161                         $toWatch = array_diff( $wanted, $current );
 162                         $toUnwatch = array_diff( $current, $wanted );
 163                         $this->watchTitles( $toWatch );
 164                         $this->unwatchTitles( $toUnwatch );
 165                         $this->getUser()->invalidateCache();
 166
 167                         if ( count( $toWatch ) > 0 || count( $toUnwatch ) > 0 ) {
 168                                 $this->successMessage = $this->msg( 'watchlistedit-raw-done' )->parse();
 169                         } else {
 170                                 return false;
 171                         }
 172
 173                         if ( count( $toWatch ) > 0 ) {
 174                                 $this->successMessage .= ' ' . $this->msg( 'watchlistedit-raw-added' )
 175                                         ->numParams( count( $toWatch ) )->parse();
 176                                 $this->showTitles( $toWatch, $this->successMessage );
 177                         }
 178
 179                         if ( count( $toUnwatch ) > 0 ) {
 180                                 $this->successMessage .= ' ' . $this->msg( 'watchlistedit-raw-removed' )
 181                                         ->numParams( count( $toUnwatch ) )->parse();
 182                                 $this->showTitles( $toUnwatch, $this->successMessage );
 183                         }
 184                 } else {
 185                         $this->clearWatchlist();
 186                         $this->getUser()->invalidateCache();
 187
 188                         if ( count( $current ) > 0 ) {
 189                                 $this->successMessage = $this->msg( 'watchlistedit-raw-done' )->parse();
 190                         } else {
 191                                 return false;
 192                         }
 193
 194                         $this->successMessage .= ' ' . $this->msg( 'watchlistedit-raw-removed' )
 195                                 ->numParams( count( $current ) )->parse();
 196                         $this->showTitles( $current, $this->successMessage );
 197                 }
 198
 199                 return true;
 200         }
 201
 202       public function submitClear( $data ) {
 203                 $current = $this->getWatchlist();
 204                 $this->clearWatchlist();
 205                 $this->getUser()->invalidateCache();
 206                         $this->successMessage = $this->msg( 'watchlistedit-clear-done' )->parse();
 207                 $this->successMessage .= ' ' . $this->msg( 'watchlistedit-clear-removed' )
 208                         ->numParams( count( $current ) )->parse();
 209                 $this->showTitles( $current, $this->successMessage );
 210
 211                 return true;
 212 }
 213
 214         /**
 215          * Print out a list of linked titles
 216          *
 217          * $titles can be an array of strings or Title objects; the former
 218          * is preferred, since Titles are very memory-heavy
 219          *
 220          * @param array $titles Array of strings, or Title objects
 221          * @param string $output
 222          */
 223         private function showTitles( $titles, &$output ) {
 224                 $talk = $this->msg( 'talkpagelinktext' )->escaped();
 225                 // Do a batch existence check
 226                 $batch = new LinkBatch();
 227                 if (count($titles) >= 100) {
 228                         $output = wfMessage( 'watchlistedit-too-many' )->parse();
 229                         return;
 230                 }
 231                 foreach ( $titles as $title ) {
 232                         if ( !$title instanceof Title ) {
 233                                 $title = Title::newFromText( $title );
 234                         }
 235
 236                         if ( $title instanceof Title ) {
 237                                 $batch->addObj( $title );
 238                                 $batch->addObj( $title->getTalkPage() );
 239                         }
 240                 }
 241
 242                 $batch->execute();
 243
 244                 // Print out the list
 245                 $output .= "<ul>\n";
 246
 247                 foreach ( $titles as $title ) {
 248                         if ( !$title instanceof Title ) {
 249                                 $title = Title::newFromText( $title );
 250                         }
 251
 252                         if ( $title instanceof Title ) {
 253                                 $output .= "<li>"
 254                                         . Linker::link( $title )
 255                                         . ' (' . Linker::link( $title->getTalkPage(), $talk )
 256                                         . ")</li>\n";
 257                         }
 258                 }
 259
 260                 $output .= "</ul>\n";
 261         }
 262
 263         /**
 264          * Prepare a list of titles on a user's watchlist (excluding talk pages)
 265          * and return an array of (prefixed) strings
 266          *
 267          * @return array
 268          */
 269         private function getWatchlist() {
 270                 $list = array();
 271                 $dbr = wfGetDB( DB_MASTER );
 272
 273                 $res = $dbr->select(
 274                         'watchlist',
 275                         array(
 276                                 'wl_namespace', 'wl_title'
 277                         ), array(
 278                                 'wl_user' => $this->getUser()->getId(),
 279                         ),
 280                         __METHOD__
 281                 );
 282
 283                 if ( $res->numRows() > 0 ) {
 284                         $titles = array();
 285                         foreach ( $res as $row ) {
 286                                 $title = Title::makeTitleSafe( $row->wl_namespace, $row->wl_title );
 287
 288                                 if ( $this->checkTitle( $title, $row->wl_namespace, $row->wl_title )
 289                                         && !$title->isTalkPage()
 290                                 ) {
 291                                         $titles[] = $title;
 292                                 }
 293                         }
 294                         $res->free();
 295
 296                         GenderCache::singleton()->doTitlesArray( $titles );
 297
 298                         foreach ( $titles as $title ) {
 299                                 $list[] = $title->getPrefixedText();
 300                         }
 301                 }
 302
 303                 $this->cleanupWatchlist();
 304
 305                 return $list;
 306         }
 307
 308         /**
 309          * Get a list of titles on a user's watchlist, excluding talk pages,
 310          * and return as a two-dimensional array with namespace and title.
 311          *
 312          * @return array
 313          */
 314         private function getWatchlistInfo() {
 315                 $titles = array();
 316                 $dbr = wfGetDB( DB_MASTER );
 317
 318                 $res = $dbr->select(
 319                         array( 'watchlist' ),
 320                         array( 'wl_namespace', 'wl_title' ),
 321                         array( 'wl_user' => $this->getUser()->getId() ),
 322                         __METHOD__,
 323                         array( 'ORDER BY' => array( 'wl_namespace', 'wl_title' ) )
 324                 );
 325
 326                 $lb = new LinkBatch();
 327
 328                 foreach ( $res as $row ) {
 329                         $lb->add( $row->wl_namespace, $row->wl_title );
 330                         if ( !MWNamespace::isTalk( $row->wl_namespace ) ) {
 331                                 $titles[$row->wl_namespace][$row->wl_title] = 1;
 332                         }
 333                 }
 334
 335                 $lb->execute();
 336
 337                 return $titles;
 338         }
 339
 340         /**
 341          * Validates watchlist entry
 342          *
 343          * @param Title $title
 344          * @param int $namespace
 345          * @param string $dbKey
 346          * @return bool Whether this item is valid
 347          */
 348         private function checkTitle( $title, $namespace, $dbKey ) {
 349                 if ( $title
 350                         && ( $title->isExternal()
 351                                 || $title->getNamespace() < 0
 352                         )
 353                 ) {
 354                         $title = false; // unrecoverable
 355                 }
 356
 357                 if ( !$title
 358                         || $title->getNamespace() != $namespace
 359                         || $title->getDBkey() != $dbKey
 360                 ) {
 361                         $this->badItems[] = array( $title, $namespace, $dbKey );
 362                 }
 363
 364                 return (bool)$title;
 365         }
 366
 367         /**
 368          * Attempts to clean up broken items
 369          */
 370         private function cleanupWatchlist() {
 371                 if ( !count( $this->badItems ) ) {
 372                         return; //nothing to do
 373                 }
 374
 375                 $dbw = wfGetDB( DB_MASTER );
 376                 $user = $this->getUser();
 377
 378                 foreach ( $this->badItems as $row ) {
 379                         list( $title, $namespace, $dbKey ) = $row;
 380                         $action = $title ? 'cleaning up' : 'deleting';
 381                         wfDebug( "User {$user->getName()} has broken watchlist item ns($namespace):$dbKey, $action.\n" );
 382
 383                         $dbw->delete( 'watchlist',
 384                                 array(
 385                                         'wl_user' => $user->getId(),
 386                                         'wl_namespace' => $namespace,
 387                                         'wl_title' => $dbKey,
 388                                 ),
 389                                 __METHOD__
 390                         );
 391
 392                         // Can't just do an UPDATE instead of DELETE/INSERT due to unique index
 393                         if ( $title ) {
 394                                 $user->addWatch( $title );
 395                         }
 396                 }
 397         }
 398
 399         /**
 400          * Remove all titles from a user's watchlist
 401          */
 402         private function clearWatchlist() {
 403                 $dbw = wfGetDB( DB_MASTER );
 404                 $dbw->delete(
 405                         'watchlist',
 406                         array( 'wl_user' => $this->getUser()->getId() ),
 407                         __METHOD__
 408                 );
 409         }
 410
 411         /**
 412          * Add a list of titles to a user's watchlist
 413          *
 414          * $titles can be an array of strings or Title objects; the former
 415          * is preferred, since Titles are very memory-heavy
 416          *
 417          * @param array $titles Array of strings, or Title objects
 418          */
 419         private function watchTitles( $titles ) {
 420                 $dbw = wfGetDB( DB_MASTER );
 421                 $rows = array();
 422
 423                 foreach ( $titles as $title ) {
 424                         if ( !$title instanceof Title ) {
 425                                 $title = Title::newFromText( $title );
 426                         }
 427
 428                         if ( $title instanceof Title ) {
 429                                 $rows[] = array(
 430                                         'wl_user' => $this->getUser()->getId(),
 431                                         'wl_namespace' => MWNamespace::getSubject( $title->getNamespace() ),
 432                                         'wl_title' => $title->getDBkey(),
 433                                         'wl_notificationtimestamp' => null,
 434                                 );
 435                                 $rows[] = array(
 436                                         'wl_user' => $this->getUser()->getId(),
 437                                         'wl_namespace' => MWNamespace::getTalk( $title->getNamespace() ),
 438                                         'wl_title' => $title->getDBkey(),
 439                                         'wl_notificationtimestamp' => null,
 440                                 );
 441                         }
 442                 }
 443
 444                 $dbw->insert( 'watchlist', $rows, __METHOD__, 'IGNORE' );
 445         }
 446
 447         /**
 448          * Remove a list of titles from a user's watchlist
 449          *
 450          * $titles can be an array of strings or Title objects; the former
 451          * is preferred, since Titles are very memory-heavy
 452          *
 453          * @param array $titles Array of strings, or Title objects
 454          */
 455         private function unwatchTitles( $titles ) {
 456                 $dbw = wfGetDB( DB_MASTER );
 457
 458                 foreach ( $titles as $title ) {
 459                         if ( !$title instanceof Title ) {
 460                                 $title = Title::newFromText( $title );
 461                         }
 462
 463                         if ( $title instanceof Title ) {
 464                                 $dbw->delete(
 465                                         'watchlist',
 466                                         array(
 467                                                 'wl_user' => $this->getUser()->getId(),
 468                                                 'wl_namespace' => MWNamespace::getSubject( $title->getNamespace() ),
 469                                                 'wl_title' => $title->getDBkey(),
 470                                         ),
 471                                         __METHOD__
 472                                 );
 473
 474                                 $dbw->delete(
 475                                         'watchlist',
 476                                         array(
 477                                                 'wl_user' => $this->getUser()->getId(),
 478                                                 'wl_namespace' => MWNamespace::getTalk( $title->getNamespace() ),
 479                                                 'wl_title' => $title->getDBkey(),
 480                                         ),
 481                                         __METHOD__
 482                                 );
 483
 484                                 $page = WikiPage::factory( $title );
 485                                 wfRunHooks( 'UnwatchArticleComplete', array( $this->getUser(), &$page ) );
 486                         }
 487                 }
 488         }
 489
 490         public function submitNormal( $data ) {
 491                 $removed = array();
 492
 493                 foreach ( $data as $titles ) {
 494                         $this->unwatchTitles( $titles );
 495                         $removed = array_merge( $removed, $titles );
 496                 }
 497
 498                 if ( count( $removed ) > 0 ) {
 499                         $this->successMessage = $this->msg( 'watchlistedit-normal-done'
 500                         )->numParams( count( $removed ) )->parse();
 501                         $this->showTitles( $removed, $this->successMessage );
 502
 503                         return true;
 504                 } else {
 505                         return false;
 506                 }
 507         }
 508
 509         /**
 510          * Get the standard watchlist editing form
 511          *
 512          * @return HTMLForm
 513          */
 514         protected function getNormalForm() {
 515                 global $wgContLang;
 516
 517                 $fields = array();
 518                 $count = 0;
 519
 520                 foreach ( $this->getWatchlistInfo() as $namespace => $pages ) {
 521                         if ( $namespace >= 0 ) {
 522                                 $fields['TitlesNs' . $namespace] = array(
 523                                         'class' => 'EditWatchlistCheckboxSeriesField',
 524                                         'options' => array(),
 525                                         'section' => "ns$namespace",
 526                                 );
 527                         }
 528
 529                         foreach ( array_keys( $pages ) as $dbkey ) {
 530                                 $title = Title::makeTitleSafe( $namespace, $dbkey );
 531
 532                                 if ( $this->checkTitle( $title, $namespace, $dbkey ) ) {
 533                                         $text = $this->buildRemoveLine( $title );
 534                                         $fields['TitlesNs' . $namespace]['options'][$text] = $title->getPrefixedText();
 535                                         $count++;
 536                                 }
 537                         }
 538                 }
 539                 $this->cleanupWatchlist();
 540
 541                 if ( count( $fields ) > 1 && $count > 30 ) {
 542                         $this->toc = Linker::tocIndent();
 543                         $tocLength = 0;
 544
 545                         foreach ( $fields as $data ) {
 546                                 # strip out the 'ns' prefix from the section name:
 547                                 $ns = substr( $data['section'], 2 );
 548
 549                                 $nsText = ( $ns == NS_MAIN )
 550                                         ? $this->msg( 'blanknamespace' )->escaped()
 551                                         : htmlspecialchars( $wgContLang->getFormattedNsText( $ns ) );
 552                                 $this->toc .= Linker::tocLine( "editwatchlist-{$data['section']}", $nsText,
 553                                         $this->getLanguage()->formatNum( ++$tocLength ), 1 ) . Linker::tocLineEnd();
 554                         }
 555
 556                         $this->toc = Linker::tocList( $this->toc );
 557                 } else {
 558                         $this->toc = false;
 559                 }
 560
 561                 $context = new DerivativeContext( $this->getContext() );
 562                 $context->setTitle( $this->getPageTitle() ); // Remove subpage
 563                 $form = new EditWatchlistNormalHTMLForm( $fields, $context );
 564                 $form->setSubmitTextMsg( 'watchlistedit-normal-submit' );
 565                 # Used message keys:
 566                 # 'accesskey-watchlistedit-normal-submit', 'tooltip-watchlistedit-normal-submit'
 567                 $form->setSubmitTooltip( 'watchlistedit-normal-submit' );
 568                 $form->setWrapperLegendMsg( 'watchlistedit-normal-legend' );
 569                 $form->addHeaderText( $this->msg( 'watchlistedit-normal-explain' )->parse() );
 570                 $form->setSubmitCallback( array( $this, 'submitNormal' ) );
 571
 572                 return $form;
 573         }
 574
 575         /**
 576          * Build the label for a checkbox, with a link to the title, and various additional bits
 577          *
 578          * @param Title $title
 579          * @return string
 580          */
 581         private function buildRemoveLine( $title ) {
 582                 $link = Linker::link( $title );
 583
 584                 if ( $title->isRedirect() ) {
 585                         // Linker already makes class mw-redirect, so this is redundant
 586                         $link = '<span class="watchlistredir">' . $link . '</span>';
 587                 }
 588
 589                 $tools[] = Linker::link( $title->getTalkPage(), $this->msg( 'talkpagelinktext' )->escaped() );
 590
 591                 if ( $title->exists() ) {
 592                         $tools[] = Linker::linkKnown(
 593                                 $title,
 594                                 $this->msg( 'history_short' )->escaped(),
 595                                 array(),
 596                                 array( 'action' => 'history' )
 597                         );
 598                 }
 599
 600                 if ( $title->getNamespace() == NS_USER && !$title->isSubpage() ) {
 601                         $tools[] = Linker::linkKnown(
 602                                 SpecialPage::getTitleFor( 'Contributions', $title->getText() ),
 603                                 $this->msg( 'contributions' )->escaped()
 604                         );
 605                 }
 606
 607                 wfRunHooks(
 608                         'WatchlistEditorBuildRemoveLine',
 609                         array( &$tools, $title, $title->isRedirect(), $this->getSkin() )
 610                 );
 611
 612                 return $link . " (" . $this->getLanguage()->pipeList( $tools ) . ")";
 613         }
 614
 615         /**
 616          * Get a form for editing the watchlist in "raw" mode
 617          *
 618          * @return HTMLForm
 619          */
 620         protected function getRawForm() {
 621                 $titles = implode( $this->getWatchlist(), "\n" );
 622                 $fields = array(
 623                         'Titles' => array(
 624                                 'type' => 'textarea',
 625                                 'label-message' => 'watchlistedit-raw-titles',
 626                                 'default' => $titles,
 627                         ),
 628                 );
 629                 $context = new DerivativeContext( $this->getContext() );
 630                 $context->setTitle( $this->getPageTitle( 'raw' ) ); // Reset subpage
 631                 $form = new HTMLForm( $fields, $context );
 632                 $form->setSubmitTextMsg( 'watchlistedit-raw-submit' );
 633                 # Used message keys: 'accesskey-watchlistedit-raw-submit', 'tooltip-watchlistedit-raw-submit'
 634                 $form->setSubmitTooltip( 'watchlistedit-raw-submit' );
 635                 $form->setWrapperLegendMsg( 'watchlistedit-raw-legend' );
 636                 $form->addHeaderText( $this->msg( 'watchlistedit-raw-explain' )->parse() );
 637                 $form->setSubmitCallback( array( $this, 'submitRaw' ) );
 638
 639                 return $form;
 640         }
 641
 642         /**
 643          * Get a form for clearing the watchlist
 644          *
 645          * @return HTMLForm
 646          */
 647         protected function getClearForm() {
 648                 $context = new DerivativeContext( $this->getContext() );
 649                 $context->setTitle( $this->getPageTitle( 'clear' ) ); // Reset subpage
 650                 $form = new HTMLForm( array(), $context );
 651                 $form->setSubmitTextMsg( 'watchlistedit-clear-submit' );
 652                 # Used message keys: 'accesskey-watchlistedit-clear-submit', 'tooltip-watchlistedit-clear-submit'
 653                 $form->setSubmitTooltip( 'watchlistedit-clear-submit' );
 654                 $form->setWrapperLegendMsg( 'watchlistedit-clear-legend' );
 655                 $form->addHeaderText( $this->msg( 'watchlistedit-clear-explain' )->parse() );
 656                 $form->setSubmitCallback( array( $this, 'submitClear' ) );
 657
 658                 return $form;
 659         }
 660
 661         /**
 662          * Determine whether we are editing the watchlist, and if so, what
 663          * kind of editing operation
 664          *
 665          * @param WebRequest $request
 666          * @param string $par
 667          * @return int
 668          */
 669         public static function getMode( $request, $par ) {
 670                 $mode = strtolower( $request->getVal( 'action', $par ) );
 671
 672                 switch ( $mode ) {
 673                         case 'clear':
 674                         case self::EDIT_CLEAR:
 675                                 return self::EDIT_CLEAR;
 676                         case 'raw':
 677                         case self::EDIT_RAW:
 678                                 return self::EDIT_RAW;
 679                         case 'edit':
 680                         case self::EDIT_NORMAL:
 681                                 return self::EDIT_NORMAL;
 682                         default:
 683                                 return false;
 684                 }
 685         }
 686
 687         /**
 688          * Build a set of links for convenient navigation
 689          * between watchlist viewing and editing modes
 690          *
 691          * @param null $unused
 692          * @return string
 693          */
 694         public static function buildTools( $unused ) {
 695                 global $wgLang;
 696
 697                 $tools = array();
 698                 $modes = array(
 699                         'view' => array( 'Watchlist', false ),
 700                         'edit' => array( 'EditWatchlist', false ),
 701                         'raw' => array( 'EditWatchlist', 'raw' ),
 702                         'clear' => array( 'EditWatchlist', 'clear' ),
 703                 );
 704
 705                 foreach ( $modes as $mode => $arr ) {
 706                         // can use messages 'watchlisttools-view', 'watchlisttools-edit', 'watchlisttools-raw'
 707                         $tools[] = Linker::linkKnown(
 708                                 SpecialPage::getTitleFor( $arr[0], $arr[1] ),
 709                                 wfMessage( "watchlisttools-{$mode}" )->escaped()
 710                         );
 711                 }
 712
 713                 return Html::rawElement(
 714                         'span',
 715                         array( 'class' => 'mw-watchlist-toollinks' ),
 716                         wfMessage( 'parentheses', $wgLang->pipeList( $tools ) )->text()
 717                 );
 718         }
 719 }
 720
 721 /**
 722  * Extend HTMLForm purely so we can have a more sane way of getting the section headers
 723  */
 724 class EditWatchlistNormalHTMLForm extends HTMLForm {
 725         public function getLegend( $namespace ) {
 726                 $namespace = substr( $namespace, 2 );
 727
 728                 return $namespace == NS_MAIN
 729                         ? $this->msg( 'blanknamespace' )->escaped()
 730                         : htmlspecialchars( $this->getContext()->getLanguage()->getFormattedNsText( $namespace ) );
 731         }
 732
 733         public function getBody() {
 734                 return $this->displaySection( $this->mFieldTree, '', 'editwatchlist-' );
 735         }
 736 }
 737
 738 class EditWatchlistCheckboxSeriesField extends HTMLMultiSelectField {
 739         /**
 740          * HTMLMultiSelectField throws validation errors if we get input data
 741          * that doesn't match the data set in the form setup. This causes
 742          * problems if something gets removed from the watchlist while the
 743          * form is open (bug 32126), but we know that invalid items will
 744          * be harmless so we can override it here.
 745          *
 746          * @param string $value the value the field was submitted with
 747          * @param array $alldata the data collected from the form
 748          * @return bool|string Bool true on success, or String error to display.
 749          */
 750         function validate( $value, $alldata ) {
 751                 // Need to call into grandparent to be a good citizen. :)
 752                 return HTMLFormField::validate( $value, $alldata );
 753         }
 754 }