includes/skins/Skin.php

   1 <?php
   2 /**
   3  * Base class for all skins.
   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  */
  22
  23 /**
  24  * @defgroup Skins Skins
  25  */
  26
  27 /**
  28  * The main skin class which provides methods and properties for all other skins.
  29  *
  30  * See docs/skin.txt for more information.
  31  *
  32  * @ingroup Skins
  33  */
  34 abstract class Skin extends ContextSource {
  35         protected $skinname = null;
  36         protected $mRelevantTitle = null;
  37         protected $mRelevantUser = null;
  38
  39         /**
  40          * @var string Stylesheets set to use. Subdirectory in skins/ where various stylesheets are
  41          *   located. Only needs to be set if you intend to use the getSkinStylePath() method.
  42          */
  43         public $stylename = null;
  44
  45         /**
  46          * Fetch the set of available skins.
  47          * @return array Associative array of strings
  48          */
  49         static function getSkinNames() {
  50                 return SkinFactory::getDefaultInstance()->getSkinNames();
  51         }
  52
  53         /**
  54          * Fetch the skinname messages for available skins.
  55          * @return string[]
  56          */
  57         static function getSkinNameMessages() {
  58                 $messages = array();
  59                 foreach ( self::getSkinNames() as $skinKey => $skinName ) {
  60                         $messages[] = "skinname-$skinKey";
  61                 }
  62                 return $messages;
  63         }
  64
  65         /**
  66          * Fetch the list of user-selectable skins in regards to $wgSkipSkins.
  67          * Useful for Special:Preferences and other places where you
  68          * only want to show skins users _can_ use.
  69          * @return string[]
  70          * @since 1.23
  71          */
  72         public static function getAllowedSkins() {
  73                 global $wgSkipSkins;
  74
  75                 $allowedSkins = self::getSkinNames();
  76
  77                 foreach ( $wgSkipSkins as $skip ) {
  78                         unset( $allowedSkins[$skip] );
  79                 }
  80
  81                 return $allowedSkins;
  82         }
  83
  84         /**
  85          * @deprecated since 1.23, use getAllowedSkins
  86          * @return string[]
  87          */
  88         public static function getUsableSkins() {
  89                 wfDeprecated( __METHOD__, '1.23' );
  90                 return self::getAllowedSkins();
  91         }
  92
  93         /**
  94          * Normalize a skin preference value to a form that can be loaded.
  95          *
  96          * If a skin can't be found, it will fall back to the configured default ($wgDefaultSkin), or the
  97          * hardcoded default ($wgFallbackSkin) if the default skin is unavailable too.
  98          *
  99          * @param string $key 'monobook', 'vector', etc.
 100          * @return string
 101          */
 102         static function normalizeKey( $key ) {
 103                 global $wgDefaultSkin, $wgFallbackSkin;
 104
 105                 $skinNames = Skin::getSkinNames();
 106
 107                 // Make keys lowercase for case-insensitive matching.
 108                 $skinNames = array_change_key_case( $skinNames, CASE_LOWER );
 109                 $key = strtolower( $key );
 110                 $defaultSkin = strtolower( $wgDefaultSkin );
 111                 $fallbackSkin = strtolower( $wgFallbackSkin );
 112
 113                 if ( $key == '' || $key == 'default' ) {
 114                         // Don't return the default immediately;
 115                         // in a misconfiguration we need to fall back.
 116                         $key = $defaultSkin;
 117                 }
 118
 119                 if ( isset( $skinNames[$key] ) ) {
 120                         return $key;
 121                 }
 122
 123                 // Older versions of the software used a numeric setting
 124                 // in the user preferences.
 125                 $fallback = array(
 126                         0 => $defaultSkin,
 127                         2 => 'cologneblue'
 128                 );
 129
 130                 if ( isset( $fallback[$key] ) ) {
 131                         $key = $fallback[$key];
 132                 }
 133
 134                 if ( isset( $skinNames[$key] ) ) {
 135                         return $key;
 136                 } elseif ( isset( $skinNames[$defaultSkin] ) ) {
 137                         return $defaultSkin;
 138                 } else {
 139                         return $fallbackSkin;
 140                 }
 141         }
 142
 143         /**
 144          * Factory method for loading a skin of a given type
 145          * @param string $key 'monobook', 'vector', etc.
 146          * @return Skin
 147          * @deprecated since 1.24; Use SkinFactory instead
 148          */
 149         static function &newFromKey( $key ) {
 150                 wfDeprecated( __METHOD__, '1.24' );
 151
 152                 $key = Skin::normalizeKey( $key );
 153                 $factory = SkinFactory::getDefaultInstance();
 154
 155                 // normalizeKey() guarantees that a skin with this key will exist.
 156                 $skin = $factory->makeSkin( $key );
 157                 return $skin;
 158         }
 159
 160         /**
 161          * @return string Skin name
 162          */
 163         public function getSkinName() {
 164                 return $this->skinname;
 165         }
 166
 167         /**
 168          * @param OutputPage $out
 169          */
 170         function initPage( OutputPage $out ) {
 171
 172                 $this->preloadExistence();
 173
 174         }
 175
 176         /**
 177          * Defines the ResourceLoader modules that should be added to the skin
 178          * It is recommended that skins wishing to override call parent::getDefaultModules()
 179          * and substitute out any modules they wish to change by using a key to look them up
 180          * @return array Array of modules with helper keys for easy overriding
 181          */
 182         public function getDefaultModules() {
 183                 global $wgIncludeLegacyJavaScript, $wgPreloadJavaScriptMwUtil, $wgUseAjax,
 184                         $wgAjaxWatch, $wgEnableAPI, $wgEnableWriteAPI;
 185
 186                 $out = $this->getOutput();
 187                 $user = $out->getUser();
 188                 $modules = array(
 189                         // modules that enhance the page content in some way
 190                         'content' => array(
 191                                 'mediawiki.page.ready',
 192                         ),
 193                         // modules that exist for legacy reasons
 194                         'legacy' => array(),
 195                         // modules relating to search functionality
 196                         'search' => array(),
 197                         // modules relating to functionality relating to watching an article
 198                         'watch' => array(),
 199                         // modules which relate to the current users preferences
 200                         'user' => array(),
 201                 );
 202                 if ( $wgIncludeLegacyJavaScript ) {
 203                         $modules['legacy'][] = 'mediawiki.legacy.wikibits';
 204                 }
 205
 206                 if ( $wgPreloadJavaScriptMwUtil ) {
 207                         $modules['legacy'][] = 'mediawiki.util';
 208                 }
 209
 210                 // Add various resources if required
 211                 if ( $wgUseAjax ) {
 212                         $modules['legacy'][] = 'mediawiki.legacy.ajax';
 213
 214                         if ( $wgEnableAPI ) {
 215                                 if ( $wgEnableWriteAPI && $wgAjaxWatch && $user->isLoggedIn()
 216                                         && $user->isAllowed( 'writeapi' )
 217                                 ) {
 218                                         $modules['watch'][] = 'mediawiki.page.watch.ajax';
 219                                 }
 220
 221                                 $modules['search'][] = 'mediawiki.searchSuggest';
 222                         }
 223                 }
 224
 225                 if ( $user->getBoolOption( 'editsectiononrightclick' ) ) {
 226                         $modules['user'][] = 'mediawiki.action.view.rightClickEdit';
 227                 }
 228
 229                 // Crazy edit-on-double-click stuff
 230                 if ( $out->isArticle() && $user->getOption( 'editondblclick' ) ) {
 231                         $modules['user'][] = 'mediawiki.action.view.dblClickEdit';
 232                 }
 233                 return $modules;
 234         }
 235
 236         /**
 237          * Preload the existence of three commonly-requested pages in a single query
 238          */
 239         function preloadExistence() {
 240                 $titles = array();
 241
 242                 $user = $this->getUser();
 243                 $title = $this->getRelevantTitle();
 244
 245                 // User/talk link
 246                 if ( $user->isLoggedIn() || $this->showIPinHeader() ) {
 247                         $titles[] = $user->getUserPage();
 248                         $titles[] = $user->getTalkPage();
 249                 }
 250
 251                 // Other tab link
 252                 if ( $title->isSpecialPage() ) {
 253                         // nothing
 254                 } elseif ( $title->isTalkPage() ) {
 255                         $titles[] = $title->getSubjectPage();
 256                 } else {
 257                         $titles[] = $title->getTalkPage();
 258                 }
 259
 260                 Hooks::run( 'SkinPreloadExistence', array( &$titles, $this ) );
 261
 262                 if ( count( $titles ) ) {
 263                         $lb = new LinkBatch( $titles );
 264                         $lb->setCaller( __METHOD__ );
 265                         $lb->execute();
 266                 }
 267         }
 268
 269         /**
 270          * Get the current revision ID
 271          *
 272          * @return int
 273          */
 274         public function getRevisionId() {
 275                 return $this->getOutput()->getRevisionId();
 276         }
 277
 278         /**
 279          * Whether the revision displayed is the latest revision of the page
 280          *
 281          * @return bool
 282          */
 283         public function isRevisionCurrent() {
 284                 $revID = $this->getRevisionId();
 285                 return $revID == 0 || $revID == $this->getTitle()->getLatestRevID();
 286         }
 287
 288         /**
 289          * Set the "relevant" title
 290          * @see self::getRelevantTitle()
 291          * @param Title $t
 292          */
 293         public function setRelevantTitle( $t ) {
 294                 $this->mRelevantTitle = $t;
 295         }
 296
 297         /**
 298          * Return the "relevant" title.
 299          * A "relevant" title is not necessarily the actual title of the page.
 300          * Special pages like Special:MovePage use set the page they are acting on
 301          * as their "relevant" title, this allows the skin system to display things
 302          * such as content tabs which belong to to that page instead of displaying
 303          * a basic special page tab which has almost no meaning.
 304          *
 305          * @return Title
 306          */
 307         public function getRelevantTitle() {
 308                 if ( isset( $this->mRelevantTitle ) ) {
 309                         return $this->mRelevantTitle;
 310                 }
 311                 return $this->getTitle();
 312         }
 313
 314         /**
 315          * Set the "relevant" user
 316          * @see self::getRelevantUser()
 317          * @param User $u
 318          */
 319         public function setRelevantUser( $u ) {
 320                 $this->mRelevantUser = $u;
 321         }
 322
 323         /**
 324          * Return the "relevant" user.
 325          * A "relevant" user is similar to a relevant title. Special pages like
 326          * Special:Contributions mark the user which they are relevant to so that
 327          * things like the toolbox can display the information they usually are only
 328          * able to display on a user's userpage and talkpage.
 329          * @return User
 330          */
 331         public function getRelevantUser() {
 332                 if ( isset( $this->mRelevantUser ) ) {
 333                         return $this->mRelevantUser;
 334                 }
 335                 $title = $this->getRelevantTitle();
 336                 if ( $title->hasSubjectNamespace( NS_USER ) ) {
 337                         $rootUser = $title->getRootText();
 338                         if ( User::isIP( $rootUser ) ) {
 339                                 $this->mRelevantUser = User::newFromName( $rootUser, false );
 340                         } else {
 341                                 $user = User::newFromName( $rootUser, false );
 342                                 if ( $user && $user->isLoggedIn() ) {
 343                                         $this->mRelevantUser = $user;
 344                                 }
 345                         }
 346                         return $this->mRelevantUser;
 347                 }
 348                 return null;
 349         }
 350
 351         /**
 352          * Outputs the HTML generated by other functions.
 353          * @param OutputPage $out
 354          */
 355         abstract function outputPage( OutputPage $out = null );
 356
 357         /**
 358          * @param array $data
 359          * @return string
 360          */
 361         static function makeVariablesScript( $data ) {
 362                 if ( $data ) {
 363                         return Html::inlineScript(
 364                                 ResourceLoader::makeLoaderConditionalScript( ResourceLoader::makeConfigSetScript( $data ) )
 365                         );
 366                 } else {
 367                         return '';
 368                 }
 369         }
 370
 371         /**
 372          * Get the query to generate a dynamic stylesheet
 373          *
 374          * @return array
 375          */
 376         public static function getDynamicStylesheetQuery() {
 377                 global $wgSquidMaxage;
 378
 379                 return array(
 380                                 'action' => 'raw',
 381                                 'maxage' => $wgSquidMaxage,
 382                                 'usemsgcache' => 'yes',
 383                                 'ctype' => 'text/css',
 384                                 'smaxage' => $wgSquidMaxage,
 385                         );
 386         }
 387
 388         /**
 389          * Add skin specific stylesheets
 390          * Calling this method with an $out of anything but the same OutputPage
 391          * inside ->getOutput() is deprecated. The $out arg is kept
 392          * for compatibility purposes with skins.
 393          * @param OutputPage $out
 394          * @todo delete
 395          */
 396         abstract function setupSkinUserCss( OutputPage $out );
 397
 398         /**
 399          * TODO: document
 400          * @param Title $title
 401          * @return string
 402          */
 403         function getPageClasses( $title ) {
 404                 $numeric = 'ns-' . $title->getNamespace();
 405
 406                 if ( $title->isSpecialPage() ) {
 407                         $type = 'ns-special';
 408                         // bug 23315: provide a class based on the canonical special page name without subpages
 409                         list( $canonicalName ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 410                         if ( $canonicalName ) {
 411                                 $type .= ' ' . Sanitizer::escapeClass( "mw-special-$canonicalName" );
 412                         } else {
 413                                 $type .= ' mw-invalidspecialpage';
 414                         }
 415                 } elseif ( $title->isTalkPage() ) {
 416                         $type = 'ns-talk';
 417                 } else {
 418                         $type = 'ns-subject';
 419                 }
 420
 421                 $name = Sanitizer::escapeClass( 'page-' . $title->getPrefixedText() );
 422
 423                 return "$numeric $type $name";
 424         }
 425
 426         /**
 427          * Return values for <html> element
 428          * @return array Array of associative name-to-value elements for <html> element
 429          */
 430         public function getHtmlElementAttributes() {
 431                 $lang = $this->getLanguage();
 432                 return array(
 433                         'lang' => $lang->getHtmlCode(),
 434                         'dir' => $lang->getDir(),
 435                         'class' => 'client-nojs',
 436                 );
 437         }
 438
 439         /**
 440          * This will be called by OutputPage::headElement when it is creating the
 441          * "<body>" tag, skins can override it if they have a need to add in any
 442          * body attributes or classes of their own.
 443          * @param OutputPage $out
 444          * @param array $bodyAttrs
 445          */
 446         function addToBodyAttributes( $out, &$bodyAttrs ) {
 447                 // does nothing by default
 448         }
 449
 450         /**
 451          * URL to the logo
 452          * @return string
 453          */
 454         function getLogo() {
 455                 global $wgLogo;
 456                 return $wgLogo;
 457         }
 458
 459         /**
 460          * @return string
 461          */
 462         function getCategoryLinks() {
 463                 global $wgUseCategoryBrowser;
 464
 465                 $out = $this->getOutput();
 466                 $allCats = $out->getCategoryLinks();
 467
 468                 if ( !count( $allCats ) ) {
 469                         return '';
 470                 }
 471
 472                 $embed = "<li>";
 473                 $pop = "</li>";
 474
 475                 $s = '';
 476                 $colon = $this->msg( 'colon-separator' )->escaped();
 477
 478                 if ( !empty( $allCats['normal'] ) ) {
 479                         $t = $embed . implode( "{$pop}{$embed}", $allCats['normal'] ) . $pop;
 480
 481                         $msg = $this->msg( 'pagecategories' )->numParams( count( $allCats['normal'] ) )->escaped();
 482                         $linkPage = wfMessage( 'pagecategorieslink' )->inContentLanguage()->text();
 483                         $title = Title::newFromText( $linkPage );
 484                         $link = $title ? Linker::link( $title, $msg ) : $msg;
 485                         $s .= '<div id="mw-normal-catlinks" class="mw-normal-catlinks">' .
 486                                 $link . $colon . '<ul>' . $t . '</ul>' . '</div>';
 487                 }
 488
 489                 # Hidden categories
 490                 if ( isset( $allCats['hidden'] ) ) {
 491                         if ( $this->getUser()->getBoolOption( 'showhiddencats' ) ) {
 492                                 $class = ' mw-hidden-cats-user-shown';
 493                         } elseif ( $this->getTitle()->getNamespace() == NS_CATEGORY ) {
 494                                 $class = ' mw-hidden-cats-ns-shown';
 495                         } else {
 496                                 $class = ' mw-hidden-cats-hidden';
 497                         }
 498
 499                         $s .= "<div id=\"mw-hidden-catlinks\" class=\"mw-hidden-catlinks$class\">" .
 500                                 $this->msg( 'hidden-categories' )->numParams( count( $allCats['hidden'] ) )->escaped() .
 501                                 $colon . '<ul>' . $embed . implode( "{$pop}{$embed}", $allCats['hidden'] ) . $pop . '</ul>' .
 502                                 '</div>';
 503                 }
 504
 505                 # optional 'dmoz-like' category browser. Will be shown under the list
 506                 # of categories an article belong to
 507                 if ( $wgUseCategoryBrowser ) {
 508                         $s .= '<br /><hr />';
 509
 510                         # get a big array of the parents tree
 511                         $parenttree = $this->getTitle()->getParentCategoryTree();
 512                         # Skin object passed by reference cause it can not be
 513                         # accessed under the method subfunction drawCategoryBrowser
 514                         $tempout = explode( "\n", $this->drawCategoryBrowser( $parenttree ) );
 515                         # Clean out bogus first entry and sort them
 516                         unset( $tempout[0] );
 517                         asort( $tempout );
 518                         # Output one per line
 519                         $s .= implode( "<br />\n", $tempout );
 520                 }
 521
 522                 return $s;
 523         }
 524
 525         /**
 526          * Render the array as a series of links.
 527          * @param array $tree Categories tree returned by Title::getParentCategoryTree
 528          * @return string Separated by &gt;, terminate with "\n"
 529          */
 530         function drawCategoryBrowser( $tree ) {
 531                 $return = '';
 532
 533                 foreach ( $tree as $element => $parent ) {
 534                         if ( empty( $parent ) ) {
 535                                 # element start a new list
 536                                 $return .= "\n";
 537                         } else {
 538                                 # grab the others elements
 539                                 $return .= $this->drawCategoryBrowser( $parent ) . ' &gt; ';
 540                         }
 541
 542                         # add our current element to the list
 543                         $eltitle = Title::newFromText( $element );
 544                         $return .= Linker::link( $eltitle, htmlspecialchars( $eltitle->getText() ) );
 545                 }
 546
 547                 return $return;
 548         }
 549
 550         /**
 551          * @return string
 552          */
 553         function getCategories() {
 554                 $out = $this->getOutput();
 555
 556                 $catlinks = $this->getCategoryLinks();
 557
 558                 $classes = 'catlinks';
 559
 560                 // Check what we're showing
 561                 $allCats = $out->getCategoryLinks();
 562                 $showHidden = $this->getUser()->getBoolOption( 'showhiddencats' ) ||
 563                                                 $this->getTitle()->getNamespace() == NS_CATEGORY;
 564
 565                 if ( empty( $allCats['normal'] ) && !( !empty( $allCats['hidden'] ) && $showHidden ) ) {
 566                         $classes .= ' catlinks-allhidden';
 567                 }
 568
 569                 return "<div id='catlinks' class='$classes'>{$catlinks}</div>";
 570         }
 571
 572         /**
 573          * This runs a hook to allow extensions placing their stuff after content
 574          * and article metadata (e.g. categories).
 575          * Note: This function has nothing to do with afterContent().
 576          *
 577          * This hook is placed here in order to allow using the same hook for all
 578          * skins, both the SkinTemplate based ones and the older ones, which directly
 579          * use this class to get their data.
 580          *
 581          * The output of this function gets processed in SkinTemplate::outputPage() for
 582          * the SkinTemplate based skins, all other skins should directly echo it.
 583          *
 584          * @return string Empty by default, if not changed by any hook function.
 585          */
 586         protected function afterContentHook() {
 587                 $data = '';
 588
 589                 if ( Hooks::run( 'SkinAfterContent', array( &$data, $this ) ) ) {
 590                         // adding just some spaces shouldn't toggle the output
 591                         // of the whole <div/>, so we use trim() here
 592                         if ( trim( $data ) != '' ) {
 593                                 // Doing this here instead of in the skins to
 594                                 // ensure that the div has the same ID in all
 595                                 // skins
 596                                 $data = "<div id='mw-data-after-content'>\n" .
 597                                         "\t$data\n" .
 598                                         "</div>\n";
 599                         }
 600                 } else {
 601                         wfDebug( "Hook SkinAfterContent changed output processing.\n" );
 602                 }
 603
 604                 return $data;
 605         }
 606
 607         /**
 608          * Generate debug data HTML for displaying at the bottom of the main content
 609          * area.
 610          * @return string HTML containing debug data, if enabled (otherwise empty).
 611          */
 612         protected function generateDebugHTML() {
 613                 return MWDebug::getHTMLDebugLog();
 614         }
 615
 616         /**
 617          * This gets called shortly before the "</body>" tag.
 618          *
 619          * @return string HTML-wrapped JS code to be put before "</body>"
 620          */
 621         function bottomScripts() {
 622                 // TODO and the suckage continues. This function is really just a wrapper around
 623                 // OutputPage::getBottomScripts() which takes a Skin param. This should be cleaned
 624                 // up at some point
 625                 $bottomScriptText = $this->getOutput()->getBottomScripts();
 626                 Hooks::run( 'SkinAfterBottomScripts', array( $this, &$bottomScriptText ) );
 627
 628                 return $bottomScriptText;
 629         }
 630
 631         /**
 632          * Text with the permalink to the source page,
 633          * usually shown on the footer of a printed page
 634          *
 635          * @return string HTML text with an URL
 636          */
 637         function printSource() {
 638                 $oldid = $this->getRevisionId();
 639                 if ( $oldid ) {
 640                         $canonicalUrl = $this->getTitle()->getCanonicalURL( 'oldid=' . $oldid );
 641                         $url = htmlspecialchars( wfExpandIRI( $canonicalUrl ) );
 642                 } else {
 643                         // oldid not available for non existing pages
 644                         $url = htmlspecialchars( wfExpandIRI( $this->getTitle()->getCanonicalURL() ) );
 645                 }
 646
 647                 return $this->msg( 'retrievedfrom' )
 648                         ->rawParams( '<a dir="ltr" href="' . $url. '">' . $url . '</a>' )
 649                         ->escaped();
 650         }
 651
 652         /**
 653          * @return string
 654          */
 655         function getUndeleteLink() {
 656                 $action = $this->getRequest()->getVal( 'action', 'view' );
 657
 658                 if ( $this->getTitle()->userCan( 'deletedhistory', $this->getUser() ) &&
 659                         ( $this->getTitle()->getArticleID() == 0 || $action == 'history' ) ) {
 660                         $n = $this->getTitle()->isDeleted();
 661
 662                         if ( $n ) {
 663                                 if ( $this->getTitle()->quickUserCan( 'undelete', $this->getUser() ) ) {
 664                                         $msg = 'thisisdeleted';
 665                                 } else {
 666                                         $msg = 'viewdeleted';
 667                                 }
 668
 669                                 return $this->msg( $msg )->rawParams(
 670                                         Linker::linkKnown(
 671                                                 SpecialPage::getTitleFor( 'Undelete', $this->getTitle()->getPrefixedDBkey() ),
 672                                                 $this->msg( 'restorelink' )->numParams( $n )->escaped() )
 673                                         )->text();
 674                         }
 675                 }
 676
 677                 return '';
 678         }
 679
 680         /**
 681          * @return string
 682          */
 683         function subPageSubtitle() {
 684                 $out = $this->getOutput();
 685                 $subpages = '';
 686
 687                 if ( !Hooks::run( 'SkinSubPageSubtitle', array( &$subpages, $this, $out ) ) ) {
 688                         return $subpages;
 689                 }
 690
 691                 if ( $out->isArticle() && MWNamespace::hasSubpages( $out->getTitle()->getNamespace() ) ) {
 692                         $ptext = $this->getTitle()->getPrefixedText();
 693                         if ( preg_match( '/\//', $ptext ) ) {
 694                                 $links = explode( '/', $ptext );
 695                                 array_pop( $links );
 696                                 $c = 0;
 697                                 $growinglink = '';
 698                                 $display = '';
 699                                 $lang = $this->getLanguage();
 700
 701                                 foreach ( $links as $link ) {
 702                                         $growinglink .= $link;
 703                                         $display .= $link;
 704                                         $linkObj = Title::newFromText( $growinglink );
 705
 706                                         if ( is_object( $linkObj ) && $linkObj->isKnown() ) {
 707                                                 $getlink = Linker::linkKnown(
 708                                                         $linkObj,
 709                                                         htmlspecialchars( $display )
 710                                                 );
 711
 712                                                 $c++;
 713
 714                                                 if ( $c > 1 ) {
 715                                                         $subpages .= $lang->getDirMarkEntity() . $this->msg( 'pipe-separator' )->escaped();
 716                                                 } else {
 717                                                         $subpages .= '&lt; ';
 718                                                 }
 719
 720                                                 $subpages .= $getlink;
 721                                                 $display = '';
 722                                         } else {
 723                                                 $display .= '/';
 724                                         }
 725                                         $growinglink .= '/';
 726                                 }
 727                         }
 728                 }
 729
 730                 return $subpages;
 731         }
 732
 733         /**
 734          * Returns true if the IP should be shown in the header
 735          * @return bool
 736          */
 737         function showIPinHeader() {
 738                 global $wgShowIPinHeader;
 739                 return $wgShowIPinHeader && session_id() != '';
 740         }
 741
 742         /**
 743          * @return string
 744          */
 745         function getSearchLink() {
 746                 $searchPage = SpecialPage::getTitleFor( 'Search' );
 747                 return $searchPage->getLocalURL();
 748         }
 749
 750         /**
 751          * @return string
 752          */
 753         function escapeSearchLink() {
 754                 return htmlspecialchars( $this->getSearchLink() );
 755         }
 756
 757         /**
 758          * @param string $type
 759          * @return string
 760          */
 761         function getCopyright( $type = 'detect' ) {
 762                 global $wgRightsPage, $wgRightsUrl, $wgRightsText;
 763
 764                 if ( $type == 'detect' ) {
 765                         if ( !$this->isRevisionCurrent()
 766                                 && !$this->msg( 'history_copyright' )->inContentLanguage()->isDisabled()
 767                         ) {
 768                                 $type = 'history';
 769                         } else {
 770                                 $type = 'normal';
 771                         }
 772                 }
 773
 774                 if ( $type == 'history' ) {
 775                         $msg = 'history_copyright';
 776                 } else {
 777                         $msg = 'copyright';
 778                 }
 779
 780                 if ( $wgRightsPage ) {
 781                         $title = Title::newFromText( $wgRightsPage );
 782                         $link = Linker::linkKnown( $title, $wgRightsText );
 783                 } elseif ( $wgRightsUrl ) {
 784                         $link = Linker::makeExternalLink( $wgRightsUrl, $wgRightsText );
 785                 } elseif ( $wgRightsText ) {
 786                         $link = $wgRightsText;
 787                 } else {
 788                         # Give up now
 789                         return '';
 790                 }
 791
 792                 // Allow for site and per-namespace customization of copyright notice.
 793                 // @todo Remove deprecated $forContent param from hook handlers and then remove here.
 794                 $forContent = true;
 795
 796                 Hooks::run(
 797                         'SkinCopyrightFooter',
 798                         array( $this->getTitle(), $type, &$msg, &$link, &$forContent )
 799                 );
 800
 801                 return $this->msg( $msg )->rawParams( $link )->text();
 802         }
 803
 804         /**
 805          * @return null|string
 806          */
 807         function getCopyrightIcon() {
 808                 global $wgRightsUrl, $wgRightsText, $wgRightsIcon, $wgCopyrightIcon;
 809
 810                 $out = '';
 811
 812                 if ( $wgCopyrightIcon ) {
 813                         $out = $wgCopyrightIcon;
 814                 } elseif ( $wgRightsIcon ) {
 815                         $icon = htmlspecialchars( $wgRightsIcon );
 816
 817                         if ( $wgRightsUrl ) {
 818                                 $url = htmlspecialchars( $wgRightsUrl );
 819                                 $out .= '<a href="' . $url . '">';
 820                         }
 821
 822                         $text = htmlspecialchars( $wgRightsText );
 823                         $out .= "<img src=\"$icon\" alt=\"$text\" width=\"88\" height=\"31\" />";
 824
 825                         if ( $wgRightsUrl ) {
 826                                 $out .= '</a>';
 827                         }
 828                 }
 829
 830                 return $out;
 831         }
 832
 833         /**
 834          * Gets the powered by MediaWiki icon.
 835          * @return string
 836          */
 837         function getPoweredBy() {
 838                 global $wgResourceBasePath;
 839
 840                 $url = htmlspecialchars( "$wgResourceBasePath/resources/assets/poweredby_mediawiki_88x31.png" );
 841                 $text = '<a href="//www.mediawiki.org/"><img src="' . $url
 842                         . '" height="31" width="88" alt="Powered by MediaWiki" /></a>';
 843                 Hooks::run( 'SkinGetPoweredBy', array( &$text, $this ) );
 844                 return $text;
 845         }
 846
 847         /**
 848          * Get the timestamp of the latest revision, formatted in user language
 849          *
 850          * @return string
 851          */
 852         protected function lastModified() {
 853                 $timestamp = $this->getOutput()->getRevisionTimestamp();
 854
 855                 # No cached timestamp, load it from the database
 856                 if ( $timestamp === null ) {
 857                         $timestamp = Revision::getTimestampFromId( $this->getTitle(), $this->getRevisionId() );
 858                 }
 859
 860                 if ( $timestamp ) {
 861                         $d = $this->getLanguage()->userDate( $timestamp, $this->getUser() );
 862                         $t = $this->getLanguage()->userTime( $timestamp, $this->getUser() );
 863                         $s = ' ' . $this->msg( 'lastmodifiedat', $d, $t )->escaped();
 864                 } else {
 865                         $s = '';
 866                 }
 867
 868                 if ( wfGetLB()->getLaggedSlaveMode() ) {
 869                         $s .= ' <strong>' . $this->msg( 'laggedslavemode' )->parse() . '</strong>';
 870                 }
 871
 872                 return $s;
 873         }
 874
 875         /**
 876          * @param string $align
 877          * @return string
 878          */
 879         function logoText( $align = '' ) {
 880                 if ( $align != '' ) {
 881                         $a = " style='float: {$align};'";
 882                 } else {
 883                         $a = '';
 884                 }
 885
 886                 $mp = $this->msg( 'mainpage' )->escaped();
 887                 $mptitle = Title::newMainPage();
 888                 $url = ( is_object( $mptitle ) ? htmlspecialchars( $mptitle->getLocalURL() ) : '' );
 889
 890                 $logourl = $this->getLogo();
 891                 $s = "<a href='{$url}'><img{$a} src='{$logourl}' alt='[{$mp}]' /></a>";
 892
 893                 return $s;
 894         }
 895
 896         /**
 897          * Renders a $wgFooterIcons icon according to the method's arguments
 898          * @param array $icon The icon to build the html for, see $wgFooterIcons
 899          *   for the format of this array.
 900          * @param bool|string $withImage Whether to use the icon's image or output
 901          *   a text-only footericon.
 902          * @return string HTML
 903          */
 904         function makeFooterIcon( $icon, $withImage = 'withImage' ) {
 905                 if ( is_string( $icon ) ) {
 906                         $html = $icon;
 907                 } else { // Assuming array
 908                         $url = isset( $icon["url"] ) ? $icon["url"] : null;
 909                         unset( $icon["url"] );
 910                         if ( isset( $icon["src"] ) && $withImage === 'withImage' ) {
 911                                 // do this the lazy way, just pass icon data as an attribute array
 912                                 $html = Html::element( 'img', $icon );
 913                         } else {
 914                                 $html = htmlspecialchars( $icon["alt"] );
 915                         }
 916                         if ( $url ) {
 917                                 $html = Html::rawElement( 'a', array( "href" => $url ), $html );
 918                         }
 919                 }
 920                 return $html;
 921         }
 922
 923         /**
 924          * Gets the link to the wiki's main page.
 925          * @return string
 926          */
 927         function mainPageLink() {
 928                 $s = Linker::linkKnown(
 929                         Title::newMainPage(),
 930                         $this->msg( 'mainpage' )->escaped()
 931                 );
 932
 933                 return $s;
 934         }
 935
 936         /**
 937          * Returns an HTML link for use in the footer
 938          * @param string $desc The i18n message key for the link text
 939          * @param string $page The i18n message key for the page to link to
 940          * @return string HTML anchor
 941          */
 942         public function footerLink( $desc, $page ) {
 943                 // if the link description has been set to "-" in the default language,
 944                 if ( $this->msg( $desc )->inContentLanguage()->isDisabled() ) {
 945                         // then it is disabled, for all languages.
 946                         return '';
 947                 } else {
 948                         // Otherwise, we display the link for the user, described in their
 949                         // language (which may or may not be the same as the default language),
 950                         // but we make the link target be the one site-wide page.
 951                         $title = Title::newFromText( $this->msg( $page )->inContentLanguage()->text() );
 952
 953                         if ( !$title ) {
 954                                 return '';
 955                         }
 956
 957                         return Linker::linkKnown(
 958                                 $title,
 959                                 $this->msg( $desc )->escaped()
 960                         );
 961                 }
 962         }
 963
 964         /**
 965          * Gets the link to the wiki's privacy policy page.
 966          * @return string HTML
 967          */
 968         function privacyLink() {
 969                 return $this->footerLink( 'privacy', 'privacypage' );
 970         }
 971
 972         /**
 973          * Gets the link to the wiki's about page.
 974          * @return string HTML
 975          */
 976         function aboutLink() {
 977                 return $this->footerLink( 'aboutsite', 'aboutpage' );
 978         }
 979
 980         /**
 981          * Gets the link to the wiki's general disclaimers page.
 982          * @return string HTML
 983          */
 984         function disclaimerLink() {
 985                 return $this->footerLink( 'disclaimers', 'disclaimerpage' );
 986         }
 987
 988         /**
 989          * Return URL options for the 'edit page' link.
 990          * This may include an 'oldid' specifier, if the current page view is such.
 991          *
 992          * @return array
 993          * @private
 994          */
 995         function editUrlOptions() {
 996                 $options = array( 'action' => 'edit' );
 997
 998                 if ( !$this->isRevisionCurrent() ) {
 999                         $options['oldid'] = intval( $this->getRevisionId() );
1000                 }
1001
1002                 return $options;
1003         }
1004
1005         /**
1006          * @param User|int $id
1007          * @return bool
1008          */
1009         function showEmailUser( $id ) {
1010                 if ( $id instanceof User ) {
1011                         $targetUser = $id;
1012                 } else {
1013                         $targetUser = User::newFromId( $id );
1014                 }
1015
1016                 # The sending user must have a confirmed email address and the target
1017                 # user must have a confirmed email address and allow emails from users.
1018                 return $this->getUser()->canSendEmail() &&
1019                         $targetUser->canReceiveEmail();
1020         }
1021
1022         /**
1023          * This function previously returned a fully resolved style path URL to images or styles stored in
1024          * the legacy skins/common/ directory.
1025          *
1026          * That directory has been removed in 1.24 and the function always returns an empty string.
1027          *
1028          * @deprecated since 1.24
1029          * @param string $name The name or path of a skin resource file
1030          * @return string Empty string
1031          */
1032         function getCommonStylePath( $name ) {
1033                 wfDeprecated( __METHOD__, '1.24' );
1034                 return '';
1035         }
1036
1037         /**
1038          * Return a fully resolved style path url to images or styles stored in the current skins's folder.
1039          * This method returns a url resolved using the configured skin style path
1040          * and includes the style version inside of the url.
1041          *
1042          * Requires $stylename to be set, otherwise throws MWException.
1043          *
1044          * @param string $name The name or path of a skin resource file
1045          * @return string The fully resolved style path url including styleversion
1046          * @throws MWException
1047          */
1048         function getSkinStylePath( $name ) {
1049                 global $wgStylePath, $wgStyleVersion;
1050
1051                 if ( $this->stylename === null ) {
1052                         $class = get_class( $this );
1053                         throw new MWException( "$class::\$stylename must be set to use getSkinStylePath()" );
1054                 }
1055
1056                 return "$wgStylePath/{$this->stylename}/$name?$wgStyleVersion";
1057         }
1058
1059         /* these are used extensively in SkinTemplate, but also some other places */
1060
1061         /**
1062          * @param string $urlaction
1063          * @return string
1064          */
1065         static function makeMainPageUrl( $urlaction = '' ) {
1066                 $title = Title::newMainPage();
1067                 self::checkTitle( $title, '' );
1068
1069                 return $title->getLocalURL( $urlaction );
1070         }
1071
1072         /**
1073          * Make a URL for a Special Page using the given query and protocol.
1074          *
1075          * If $proto is set to null, make a local URL. Otherwise, make a full
1076          * URL with the protocol specified.
1077          *
1078          * @param string $name Name of the Special page
1079          * @param string $urlaction Query to append
1080          * @param string|null $proto Protocol to use or null for a local URL
1081          * @return string
1082          */
1083         static function makeSpecialUrl( $name, $urlaction = '', $proto = null ) {
1084                 $title = SpecialPage::getSafeTitleFor( $name );
1085                 if ( is_null( $proto ) ) {
1086                         return $title->getLocalURL( $urlaction );
1087                 } else {
1088                         return $title->getFullURL( $urlaction, false, $proto );
1089                 }
1090         }
1091
1092         /**
1093          * @param string $name
1094          * @param string $subpage
1095          * @param string $urlaction
1096          * @return string
1097          */
1098         static function makeSpecialUrlSubpage( $name, $subpage, $urlaction = '' ) {
1099                 $title = SpecialPage::getSafeTitleFor( $name, $subpage );
1100                 return $title->getLocalURL( $urlaction );
1101         }
1102
1103         /**
1104          * @param string $name
1105          * @param string $urlaction
1106          * @return string
1107          */
1108         static function makeI18nUrl( $name, $urlaction = '' ) {
1109                 $title = Title::newFromText( wfMessage( $name )->inContentLanguage()->text() );
1110                 self::checkTitle( $title, $name );
1111                 return $title->getLocalURL( $urlaction );
1112         }
1113
1114         /**
1115          * @param string $name
1116          * @param string $urlaction
1117          * @return string
1118          */
1119         static function makeUrl( $name, $urlaction = '' ) {
1120                 $title = Title::newFromText( $name );
1121                 self::checkTitle( $title, $name );
1122
1123                 return $title->getLocalURL( $urlaction );
1124         }
1125
1126         /**
1127          * If url string starts with http, consider as external URL, else
1128          * internal
1129          * @param string $name
1130          * @return string URL
1131          */
1132         static function makeInternalOrExternalUrl( $name ) {
1133                 if ( preg_match( '/^(?i:' . wfUrlProtocols() . ')/', $name ) ) {
1134                         return $name;
1135                 } else {
1136                         return self::makeUrl( $name );
1137                 }
1138         }
1139
1140         /**
1141          * this can be passed the NS number as defined in Language.php
1142          * @param string $name
1143          * @param string $urlaction
1144          * @param int $namespace
1145          * @return string
1146          */
1147         static function makeNSUrl( $name, $urlaction = '', $namespace = NS_MAIN ) {
1148                 $title = Title::makeTitleSafe( $namespace, $name );
1149                 self::checkTitle( $title, $name );
1150
1151                 return $title->getLocalURL( $urlaction );
1152         }
1153
1154         /**
1155          * these return an array with the 'href' and boolean 'exists'
1156          * @param string $name
1157          * @param string $urlaction
1158          * @return array
1159          */
1160         static function makeUrlDetails( $name, $urlaction = '' ) {
1161                 $title = Title::newFromText( $name );
1162                 self::checkTitle( $title, $name );
1163
1164                 return array(
1165                         'href' => $title->getLocalURL( $urlaction ),
1166                         'exists' => $title->getArticleID() != 0,
1167                 );
1168         }
1169
1170         /**
1171          * Make URL details where the article exists (or at least it's convenient to think so)
1172          * @param string $name Article name
1173          * @param string $urlaction
1174          * @return array
1175          */
1176         static function makeKnownUrlDetails( $name, $urlaction = '' ) {
1177                 $title = Title::newFromText( $name );
1178                 self::checkTitle( $title, $name );
1179
1180                 return array(
1181                         'href' => $title->getLocalURL( $urlaction ),
1182                         'exists' => true
1183                 );
1184         }
1185
1186         /**
1187          * make sure we have some title to operate on
1188          *
1189          * @param Title $title
1190          * @param string $name
1191          */
1192         static function checkTitle( &$title, $name ) {
1193                 if ( !is_object( $title ) ) {
1194                         $title = Title::newFromText( $name );
1195                         if ( !is_object( $title ) ) {
1196                                 $title = Title::newFromText( '--error: link target missing--' );
1197                         }
1198                 }
1199         }
1200
1201         /**
1202          * Build an array that represents the sidebar(s), the navigation bar among them.
1203          *
1204          * BaseTemplate::getSidebar can be used to simplify the format and id generation in new skins.
1205          *
1206          * The format of the returned array is array( heading => content, ... ), where:
1207          * - heading is the heading of a navigation portlet. It is either:
1208          *   - magic string to be handled by the skins ('SEARCH' / 'LANGUAGES' / 'TOOLBOX' / ...)
1209          *   - a message name (e.g. 'navigation'), the message should be HTML-escaped by the skin
1210          *   - plain text, which should be HTML-escaped by the skin
1211          * - content is the contents of the portlet. It is either:
1212          *   - HTML text (<ul><li>...</li>...</ul>)
1213          *   - array of link data in a format accepted by BaseTemplate::makeListItem()
1214          *   - (for a magic string as a key, any value)
1215          *
1216          * Note that extensions can control the sidebar contents using the SkinBuildSidebar hook
1217          * and can technically insert anything in here; skin creators are expected to handle
1218          * values described above.
1219          *
1220          * @return array
1221          */
1222         function buildSidebar() {
1223                 global $wgMemc, $wgEnableSidebarCache, $wgSidebarCacheExpiry;
1224
1225                 $key = wfMemcKey( 'sidebar', $this->getLanguage()->getCode() );
1226
1227                 if ( $wgEnableSidebarCache ) {
1228                         $cachedsidebar = $wgMemc->get( $key );
1229                         if ( $cachedsidebar ) {
1230                                 Hooks::run( 'SidebarBeforeOutput', array( $this, &$cachedsidebar ) );
1231
1232                                 return $cachedsidebar;
1233                         }
1234                 }
1235
1236                 $bar = array();
1237                 $this->addToSidebar( $bar, 'sidebar' );
1238
1239                 Hooks::run( 'SkinBuildSidebar', array( $this, &$bar ) );
1240                 if ( $wgEnableSidebarCache ) {
1241                         $wgMemc->set( $key, $bar, $wgSidebarCacheExpiry );
1242                 }
1243
1244                 Hooks::run( 'SidebarBeforeOutput', array( $this, &$bar ) );
1245
1246                 return $bar;
1247         }
1248
1249         /**
1250          * Add content from a sidebar system message
1251          * Currently only used for MediaWiki:Sidebar (but may be used by Extensions)
1252          *
1253          * This is just a wrapper around addToSidebarPlain() for backwards compatibility
1254          *
1255          * @param array $bar
1256          * @param string $message
1257          */
1258         function addToSidebar( &$bar, $message ) {
1259                 $this->addToSidebarPlain( $bar, wfMessage( $message )->inContentLanguage()->plain() );
1260         }
1261
1262         /**
1263          * Add content from plain text
1264          * @since 1.17
1265          * @param array $bar
1266          * @param string $text
1267          * @return array
1268          */
1269         function addToSidebarPlain( &$bar, $text ) {
1270                 $lines = explode( "\n", $text );
1271
1272                 $heading = '';
1273
1274                 foreach ( $lines as $line ) {
1275                         if ( strpos( $line, '*' ) !== 0 ) {
1276                                 continue;
1277                         }
1278                         $line = rtrim( $line, "\r" ); // for Windows compat
1279
1280                         if ( strpos( $line, '**' ) !== 0 ) {
1281                                 $heading = trim( $line, '* ' );
1282                                 if ( !array_key_exists( $heading, $bar ) ) {
1283                                         $bar[$heading] = array();
1284                                 }
1285                         } else {
1286                                 $line = trim( $line, '* ' );
1287
1288                                 if ( strpos( $line, '|' ) !== false ) { // sanity check
1289                                         $line = MessageCache::singleton()->transform( $line, false, null, $this->getTitle() );
1290                                         $line = array_map( 'trim', explode( '|', $line, 2 ) );
1291                                         if ( count( $line ) !== 2 ) {
1292                                                 // Second sanity check, could be hit by people doing
1293                                                 // funky stuff with parserfuncs... (bug 33321)
1294                                                 continue;
1295                                         }
1296
1297                                         $extraAttribs = array();
1298
1299                                         $msgLink = $this->msg( $line[0] )->inContentLanguage();
1300                                         if ( $msgLink->exists() ) {
1301                                                 $link = $msgLink->text();
1302                                                 if ( $link == '-' ) {
1303                                                         continue;
1304                                                 }
1305                                         } else {
1306                                                 $link = $line[0];
1307                                         }
1308                                         $msgText = $this->msg( $line[1] );
1309                                         if ( $msgText->exists() ) {
1310                                                 $text = $msgText->text();
1311                                         } else {
1312                                                 $text = $line[1];
1313                                         }
1314
1315                                         if ( preg_match( '/^(?i:' . wfUrlProtocols() . ')/', $link ) ) {
1316                                                 $href = $link;
1317
1318                                                 // Parser::getExternalLinkAttribs won't work here because of the Namespace things
1319                                                 global $wgNoFollowLinks, $wgNoFollowDomainExceptions;
1320                                                 if ( $wgNoFollowLinks && !wfMatchesDomainList( $href, $wgNoFollowDomainExceptions ) ) {
1321                                                         $extraAttribs['rel'] = 'nofollow';
1322                                                 }
1323
1324                                                 global $wgExternalLinkTarget;
1325                                                 if ( $wgExternalLinkTarget ) {
1326                                                         $extraAttribs['target'] = $wgExternalLinkTarget;
1327                                                 }
1328                                         } else {
1329                                                 $title = Title::newFromText( $link );
1330
1331                                                 if ( $title ) {
1332                                                         $title = $title->fixSpecialName();
1333                                                         $href = $title->getLinkURL();
1334                                                 } else {
1335                                                         $href = 'INVALID-TITLE';
1336                                                 }
1337                                         }
1338
1339                                         $bar[$heading][] = array_merge( array(
1340                                                 'text' => $text,
1341                                                 'href' => $href,
1342                                                 'id' => 'n-' . Sanitizer::escapeId( strtr( $line[1], ' ', '-' ), 'noninitial' ),
1343                                                 'active' => false
1344                                         ), $extraAttribs );
1345                                 } else {
1346                                         continue;
1347                                 }
1348                         }
1349                 }
1350
1351                 return $bar;
1352         }
1353
1354         /**
1355          * This function previously controlled whether the 'mediawiki.legacy.wikiprintable' module
1356          * should be loaded by OutputPage. That module no longer exists and the return value of this
1357          * method is ignored.
1358          *
1359          * If your skin doesn't provide its own print styles, the 'mediawiki.legacy.commonPrint' module
1360          * can be used instead (SkinTemplate-based skins do it automatically).
1361          *
1362          * @deprecated since 1.22
1363          * @return bool
1364          */
1365         public function commonPrintStylesheet() {
1366                 wfDeprecated( __METHOD__, '1.22' );
1367                 return false;
1368         }
1369
1370         /**
1371          * Gets new talk page messages for the current user and returns an
1372          * appropriate alert message (or an empty string if there are no messages)
1373          * @return string
1374          */
1375         function getNewtalks() {
1376
1377                 $newMessagesAlert = '';
1378                 $user = $this->getUser();
1379                 $newtalks = $user->getNewMessageLinks();
1380                 $out = $this->getOutput();
1381
1382                 // Allow extensions to disable or modify the new messages alert
1383                 if ( !Hooks::run( 'GetNewMessagesAlert', array( &$newMessagesAlert, $newtalks, $user, $out ) ) ) {
1384                         return '';
1385                 }
1386                 if ( $newMessagesAlert ) {
1387                         return $newMessagesAlert;
1388                 }
1389
1390                 if ( count( $newtalks ) == 1 && $newtalks[0]['wiki'] === wfWikiID() ) {
1391                         $uTalkTitle = $user->getTalkPage();
1392                         $lastSeenRev = isset( $newtalks[0]['rev'] ) ? $newtalks[0]['rev'] : null;
1393                         $nofAuthors = 0;
1394                         if ( $lastSeenRev !== null ) {
1395                                 $plural = true; // Default if we have a last seen revision: if unknown, use plural
1396                                 $latestRev = Revision::newFromTitle( $uTalkTitle, false, Revision::READ_NORMAL );
1397                                 if ( $latestRev !== null ) {
1398                                         // Singular if only 1 unseen revision, plural if several unseen revisions.
1399                                         $plural = $latestRev->getParentId() !== $lastSeenRev->getId();
1400                                         $nofAuthors = $uTalkTitle->countAuthorsBetween(
1401                                                 $lastSeenRev, $latestRev, 10, 'include_new' );
1402                                 }
1403                         } else {
1404                                 // Singular if no revision -> diff link will show latest change only in any case
1405                                 $plural = false;
1406                         }
1407                         $plural = $plural ? 999 : 1;
1408                         // 999 signifies "more than one revision". We don't know how many, and even if we did,
1409                         // the number of revisions or authors is not necessarily the same as the number of
1410                         // "messages".
1411                         $newMessagesLink = Linker::linkKnown(
1412                                 $uTalkTitle,
1413                                 $this->msg( 'newmessageslinkplural' )->params( $plural )->escaped(),
1414                                 array(),
1415                                 array( 'redirect' => 'no' )
1416                         );
1417
1418                         $newMessagesDiffLink = Linker::linkKnown(
1419                                 $uTalkTitle,
1420                                 $this->msg( 'newmessagesdifflinkplural' )->params( $plural )->escaped(),
1421                                 array(),
1422                                 $lastSeenRev !== null
1423                                         ? array( 'oldid' => $lastSeenRev->getId(), 'diff' => 'cur' )
1424                                         : array( 'diff' => 'cur' )
1425                         );
1426
1427                         if ( $nofAuthors >= 1 && $nofAuthors <= 10 ) {
1428                                 $newMessagesAlert = $this->msg(
1429                                         'youhavenewmessagesfromusers',
1430                                         $newMessagesLink,
1431                                         $newMessagesDiffLink
1432                                 )->numParams( $nofAuthors, $plural );
1433                         } else {
1434                                 // $nofAuthors === 11 signifies "11 or more" ("more than 10")
1435                                 $newMessagesAlert = $this->msg(
1436                                         $nofAuthors > 10 ? 'youhavenewmessagesmanyusers' : 'youhavenewmessages',
1437                                         $newMessagesLink,
1438                                         $newMessagesDiffLink
1439                                 )->numParams( $plural );
1440                         }
1441                         $newMessagesAlert = $newMessagesAlert->text();
1442                         # Disable Squid cache
1443                         $out->setSquidMaxage( 0 );
1444                 } elseif ( count( $newtalks ) ) {
1445                         $sep = $this->msg( 'newtalkseparator' )->escaped();
1446                         $msgs = array();
1447
1448                         foreach ( $newtalks as $newtalk ) {
1449                                 $msgs[] = Xml::element(
1450                                         'a',
1451                                         array( 'href' => $newtalk['link'] ), $newtalk['wiki']
1452                                 );
1453                         }
1454                         $parts = implode( $sep, $msgs );
1455                         $newMessagesAlert = $this->msg( 'youhavenewmessagesmulti' )->rawParams( $parts )->escaped();
1456                         $out->setSquidMaxage( 0 );
1457                 }
1458
1459                 return $newMessagesAlert;
1460         }
1461
1462         /**
1463          * Get a cached notice
1464          *
1465          * @param string $name Message name, or 'default' for $wgSiteNotice
1466          * @return string HTML fragment
1467          */
1468         private function getCachedNotice( $name ) {
1469                 global $wgRenderHashAppend, $parserMemc, $wgContLang;
1470
1471                 $needParse = false;
1472
1473                 if ( $name === 'default' ) {
1474                         // special case
1475                         global $wgSiteNotice;
1476                         $notice = $wgSiteNotice;
1477                         if ( empty( $notice ) ) {
1478                                 return false;
1479                         }
1480                 } else {
1481                         $msg = $this->msg( $name )->inContentLanguage();
1482                         if ( $msg->isDisabled() ) {
1483                                 return false;
1484                         }
1485                         $notice = $msg->plain();
1486                 }
1487
1488                 // Use the extra hash appender to let eg SSL variants separately cache.
1489                 $key = wfMemcKey( $name . $wgRenderHashAppend );
1490                 $cachedNotice = $parserMemc->get( $key );
1491                 if ( is_array( $cachedNotice ) ) {
1492                         if ( md5( $notice ) == $cachedNotice['hash'] ) {
1493                                 $notice = $cachedNotice['html'];
1494                         } else {
1495                                 $needParse = true;
1496                         }
1497                 } else {
1498                         $needParse = true;
1499                 }
1500
1501                 if ( $needParse ) {
1502                         $parsed = $this->getOutput()->parse( $notice );
1503                         $parserMemc->set( $key, array( 'html' => $parsed, 'hash' => md5( $notice ) ), 600 );
1504                         $notice = $parsed;
1505                 }
1506
1507                 $notice = Html::rawElement( 'div', array( 'id' => 'localNotice',
1508                         'lang' => $wgContLang->getHtmlCode(), 'dir' => $wgContLang->getDir() ), $notice );
1509                 return $notice;
1510         }
1511
1512         /**
1513          * Get a notice based on page's namespace
1514          *
1515          * @return string HTML fragment
1516          */
1517         function getNamespaceNotice() {
1518
1519                 $key = 'namespacenotice-' . $this->getTitle()->getNsText();
1520                 $namespaceNotice = $this->getCachedNotice( $key );
1521                 if ( $namespaceNotice && substr( $namespaceNotice, 0, 7 ) != '<p>&lt;' ) {
1522                         $namespaceNotice = '<div id="namespacebanner">' . $namespaceNotice . '</div>';
1523                 } else {
1524                         $namespaceNotice = '';
1525                 }
1526
1527                 return $namespaceNotice;
1528         }
1529
1530         /**
1531          * Get the site notice
1532          *
1533          * @return string HTML fragment
1534          */
1535         function getSiteNotice() {
1536                 $siteNotice = '';
1537
1538                 if ( Hooks::run( 'SiteNoticeBefore', array( &$siteNotice, $this ) ) ) {
1539                         if ( is_object( $this->getUser() ) && $this->getUser()->isLoggedIn() ) {
1540                                 $siteNotice = $this->getCachedNotice( 'sitenotice' );
1541                         } else {
1542                                 $anonNotice = $this->getCachedNotice( 'anonnotice' );
1543                                 if ( !$anonNotice ) {
1544                                         $siteNotice = $this->getCachedNotice( 'sitenotice' );
1545                                 } else {
1546                                         $siteNotice = $anonNotice;
1547                                 }
1548                         }
1549                         if ( !$siteNotice ) {
1550                                 $siteNotice = $this->getCachedNotice( 'default' );
1551                         }
1552                 }
1553
1554                 Hooks::run( 'SiteNoticeAfter', array( &$siteNotice, $this ) );
1555                 return $siteNotice;
1556         }
1557
1558         /**
1559          * Create a section edit link.  This supersedes editSectionLink() and
1560          * editSectionLinkForOther().
1561          *
1562          * @param Title $nt The title being linked to (may not be the same as
1563          *   the current page, if the section is included from a template)
1564          * @param string $section The designation of the section being pointed to,
1565          *   to be included in the link, like "&section=$section"
1566          * @param string $tooltip The tooltip to use for the link: will be escaped
1567          *   and wrapped in the 'editsectionhint' message
1568          * @param string $lang Language code
1569          * @return string HTML to use for edit link
1570          */
1571         public function doEditSectionLink( Title $nt, $section, $tooltip = null, $lang = false ) {
1572                 // HTML generated here should probably have userlangattributes
1573                 // added to it for LTR text on RTL pages
1574
1575                 $lang = wfGetLangObj( $lang );
1576
1577                 $attribs = array();
1578                 if ( !is_null( $tooltip ) ) {
1579                         # Bug 25462: undo double-escaping.
1580                         $tooltip = Sanitizer::decodeCharReferences( $tooltip );
1581                         $attribs['title'] = wfMessage( 'editsectionhint' )->rawParams( $tooltip )
1582                                 ->inLanguage( $lang )->text();
1583                 }
1584                 $link = Linker::link( $nt, wfMessage( 'editsection' )->inLanguage( $lang )->text(),
1585                         $attribs,
1586                         array( 'action' => 'edit', 'section' => $section ),
1587                         array( 'noclasses', 'known' )
1588                 );
1589
1590                 # Add the brackets and the span and run the hook.
1591                 $result = '<span class="mw-editsection">'
1592                         . '<span class="mw-editsection-bracket">[</span>'
1593                         . $link
1594                         . '<span class="mw-editsection-bracket">]</span>'
1595                         . '</span>';
1596
1597                 Hooks::run( 'DoEditSectionLink', array( $this, $nt, $section, $tooltip, &$result, $lang ) );
1598                 return $result;
1599         }
1600
1601         /**
1602          * Use PHP's magic __call handler to intercept legacy calls to the linker
1603          * for backwards compatibility.
1604          *
1605          * @param string $fname Name of called method
1606          * @param array $args Arguments to the method
1607          * @throws MWException
1608          * @return mixed
1609          */
1610         function __call( $fname, $args ) {
1611                 $realFunction = array( 'Linker', $fname );
1612                 if ( is_callable( $realFunction ) ) {
1613                         wfDeprecated( get_class( $this ) . '::' . $fname, '1.21' );
1614                         return call_user_func_array( $realFunction, $args );
1615                 } else {
1616                         $className = get_class( $this );
1617                         throw new MWException( "Call to undefined method $className::$fname" );
1618                 }
1619         }
1620
1621 }