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 $wgUseAjax, $wgAjaxWatch, $wgEnableAPI, $wgEnableWriteAPI;
 184
 185                 $out = $this->getOutput();
 186                 $user = $out->getUser();
 187                 $modules = array(
 188                         // modules that enhance the page content in some way
 189                         'content' => array(
 190                                 'mediawiki.page.ready',
 191                         ),
 192                         // modules that exist for legacy reasons
 193                         'legacy' => ResourceLoaderStartUpModule::getLegacyModules(),
 194                         // modules relating to search functionality
 195                         'search' => array(),
 196                         // modules relating to functionality relating to watching an article
 197                         'watch' => array(),
 198                         // modules which relate to the current users preferences
 199                         'user' => array(),
 200                 );
 201
 202                 // Add various resources if required
 203                 if ( $wgUseAjax ) {
 204                         if ( $wgEnableAPI ) {
 205                                 if ( $wgEnableWriteAPI && $wgAjaxWatch && $user->isLoggedIn()
 206                                         && $user->isAllowed( 'writeapi' )
 207                                 ) {
 208                                         $modules['watch'][] = 'mediawiki.page.watch.ajax';
 209                                 }
 210
 211                                 $modules['search'][] = 'mediawiki.searchSuggest';
 212                         }
 213                 }
 214
 215                 if ( $user->getBoolOption( 'editsectiononrightclick' ) ) {
 216                         $modules['user'][] = 'mediawiki.action.view.rightClickEdit';
 217                 }
 218
 219                 // Crazy edit-on-double-click stuff
 220                 if ( $out->isArticle() && $user->getOption( 'editondblclick' ) ) {
 221                         $modules['user'][] = 'mediawiki.action.view.dblClickEdit';
 222                 }
 223                 return $modules;
 224         }
 225
 226         /**
 227          * Preload the existence of three commonly-requested pages in a single query
 228          */
 229         function preloadExistence() {
 230                 $titles = array();
 231
 232                 $user = $this->getUser();
 233                 $title = $this->getRelevantTitle();
 234
 235                 // User/talk link
 236                 if ( $user->isLoggedIn() || $this->showIPinHeader() ) {
 237                         $titles[] = $user->getUserPage();
 238                         $titles[] = $user->getTalkPage();
 239                 }
 240
 241                 // Other tab link
 242                 if ( $title->isSpecialPage() ) {
 243                         // nothing
 244                 } elseif ( $title->isTalkPage() ) {
 245                         $titles[] = $title->getSubjectPage();
 246                 } else {
 247                         $titles[] = $title->getTalkPage();
 248                 }
 249
 250                 Hooks::run( 'SkinPreloadExistence', array( &$titles, $this ) );
 251
 252                 if ( count( $titles ) ) {
 253                         $lb = new LinkBatch( $titles );
 254                         $lb->setCaller( __METHOD__ );
 255                         $lb->execute();
 256                 }
 257         }
 258
 259         /**
 260          * Get the current revision ID
 261          *
 262          * @return int
 263          */
 264         public function getRevisionId() {
 265                 return $this->getOutput()->getRevisionId();
 266         }
 267
 268         /**
 269          * Whether the revision displayed is the latest revision of the page
 270          *
 271          * @return bool
 272          */
 273         public function isRevisionCurrent() {
 274                 $revID = $this->getRevisionId();
 275                 return $revID == 0 || $revID == $this->getTitle()->getLatestRevID();
 276         }
 277
 278         /**
 279          * Set the "relevant" title
 280          * @see self::getRelevantTitle()
 281          * @param Title $t
 282          */
 283         public function setRelevantTitle( $t ) {
 284                 $this->mRelevantTitle = $t;
 285         }
 286
 287         /**
 288          * Return the "relevant" title.
 289          * A "relevant" title is not necessarily the actual title of the page.
 290          * Special pages like Special:MovePage use set the page they are acting on
 291          * as their "relevant" title, this allows the skin system to display things
 292          * such as content tabs which belong to to that page instead of displaying
 293          * a basic special page tab which has almost no meaning.
 294          *
 295          * @return Title
 296          */
 297         public function getRelevantTitle() {
 298                 if ( isset( $this->mRelevantTitle ) ) {
 299                         return $this->mRelevantTitle;
 300                 }
 301                 return $this->getTitle();
 302         }
 303
 304         /**
 305          * Set the "relevant" user
 306          * @see self::getRelevantUser()
 307          * @param User $u
 308          */
 309         public function setRelevantUser( $u ) {
 310                 $this->mRelevantUser = $u;
 311         }
 312
 313         /**
 314          * Return the "relevant" user.
 315          * A "relevant" user is similar to a relevant title. Special pages like
 316          * Special:Contributions mark the user which they are relevant to so that
 317          * things like the toolbox can display the information they usually are only
 318          * able to display on a user's userpage and talkpage.
 319          * @return User
 320          */
 321         public function getRelevantUser() {
 322                 if ( isset( $this->mRelevantUser ) ) {
 323                         return $this->mRelevantUser;
 324                 }
 325                 $title = $this->getRelevantTitle();
 326                 if ( $title->hasSubjectNamespace( NS_USER ) ) {
 327                         $rootUser = $title->getRootText();
 328                         if ( User::isIP( $rootUser ) ) {
 329                                 $this->mRelevantUser = User::newFromName( $rootUser, false );
 330                         } else {
 331                                 $user = User::newFromName( $rootUser, false );
 332
 333                                 if ( $user ) {
 334                                         $user->load( User::READ_NORMAL );
 335
 336                                         if ( $user->isLoggedIn() ) {
 337                                                 $this->mRelevantUser = $user;
 338                                         }
 339                                 }
 340                         }
 341                         return $this->mRelevantUser;
 342                 }
 343                 return null;
 344         }
 345
 346         /**
 347          * Outputs the HTML generated by other functions.
 348          * @param OutputPage $out
 349          */
 350         abstract function outputPage( OutputPage $out = null );
 351
 352         /**
 353          * @param array $data
 354          * @return string
 355          */
 356         static function makeVariablesScript( $data ) {
 357                 if ( $data ) {
 358                         return ResourceLoader::makeInlineScript(
 359                                 ResourceLoader::makeConfigSetScript( $data )
 360                         );
 361                 } else {
 362                         return '';
 363                 }
 364         }
 365
 366         /**
 367          * Get the query to generate a dynamic stylesheet
 368          *
 369          * @return array
 370          */
 371         public static function getDynamicStylesheetQuery() {
 372                 global $wgSquidMaxage;
 373
 374                 return array(
 375                                 'action' => 'raw',
 376                                 'maxage' => $wgSquidMaxage,
 377                                 'usemsgcache' => 'yes',
 378                                 'ctype' => 'text/css',
 379                                 'smaxage' => $wgSquidMaxage,
 380                         );
 381         }
 382
 383         /**
 384          * Add skin specific stylesheets
 385          * Calling this method with an $out of anything but the same OutputPage
 386          * inside ->getOutput() is deprecated. The $out arg is kept
 387          * for compatibility purposes with skins.
 388          * @param OutputPage $out
 389          * @todo delete
 390          */
 391         abstract function setupSkinUserCss( OutputPage $out );
 392
 393         /**
 394          * TODO: document
 395          * @param Title $title
 396          * @return string
 397          */
 398         function getPageClasses( $title ) {
 399                 $numeric = 'ns-' . $title->getNamespace();
 400
 401                 if ( $title->isSpecialPage() ) {
 402                         $type = 'ns-special';
 403                         // bug 23315: provide a class based on the canonical special page name without subpages
 404                         list( $canonicalName ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 405                         if ( $canonicalName ) {
 406                                 $type .= ' ' . Sanitizer::escapeClass( "mw-special-$canonicalName" );
 407                         } else {
 408                                 $type .= ' mw-invalidspecialpage';
 409                         }
 410                 } elseif ( $title->isTalkPage() ) {
 411                         $type = 'ns-talk';
 412                 } else {
 413                         $type = 'ns-subject';
 414                 }
 415
 416                 $name = Sanitizer::escapeClass( 'page-' . $title->getPrefixedText() );
 417
 418                 return "$numeric $type $name";
 419         }
 420
 421         /**
 422          * Return values for <html> element
 423          * @return array Array of associative name-to-value elements for <html> element
 424          */
 425         public function getHtmlElementAttributes() {
 426                 $lang = $this->getLanguage();
 427                 return array(
 428                         'lang' => $lang->getHtmlCode(),
 429                         'dir' => $lang->getDir(),
 430                         'class' => 'client-nojs',
 431                 );
 432         }
 433
 434         /**
 435          * This will be called by OutputPage::headElement when it is creating the
 436          * "<body>" tag, skins can override it if they have a need to add in any
 437          * body attributes or classes of their own.
 438          * @param OutputPage $out
 439          * @param array $bodyAttrs
 440          */
 441         function addToBodyAttributes( $out, &$bodyAttrs ) {
 442                 // does nothing by default
 443         }
 444
 445         /**
 446          * URL to the logo
 447          * @return string
 448          */
 449         function getLogo() {
 450                 global $wgLogo;
 451                 return $wgLogo;
 452         }
 453
 454         /**
 455          * @return string
 456          */
 457         function getCategoryLinks() {
 458                 global $wgUseCategoryBrowser;
 459
 460                 $out = $this->getOutput();
 461                 $allCats = $out->getCategoryLinks();
 462
 463                 if ( !count( $allCats ) ) {
 464                         return '';
 465                 }
 466
 467                 $embed = "<li>";
 468                 $pop = "</li>";
 469
 470                 $s = '';
 471                 $colon = $this->msg( 'colon-separator' )->escaped();
 472
 473                 if ( !empty( $allCats['normal'] ) ) {
 474                         $t = $embed . implode( "{$pop}{$embed}", $allCats['normal'] ) . $pop;
 475
 476                         $msg = $this->msg( 'pagecategories' )->numParams( count( $allCats['normal'] ) )->escaped();
 477                         $linkPage = wfMessage( 'pagecategorieslink' )->inContentLanguage()->text();
 478                         $title = Title::newFromText( $linkPage );
 479                         $link = $title ? Linker::link( $title, $msg ) : $msg;
 480                         $s .= '<div id="mw-normal-catlinks" class="mw-normal-catlinks">' .
 481                                 $link . $colon . '<ul>' . $t . '</ul>' . '</div>';
 482                 }
 483
 484                 # Hidden categories
 485                 if ( isset( $allCats['hidden'] ) ) {
 486                         if ( $this->getUser()->getBoolOption( 'showhiddencats' ) ) {
 487                                 $class = ' mw-hidden-cats-user-shown';
 488                         } elseif ( $this->getTitle()->getNamespace() == NS_CATEGORY ) {
 489                                 $class = ' mw-hidden-cats-ns-shown';
 490                         } else {
 491                                 $class = ' mw-hidden-cats-hidden';
 492                         }
 493
 494                         $s .= "<div id=\"mw-hidden-catlinks\" class=\"mw-hidden-catlinks$class\">" .
 495                                 $this->msg( 'hidden-categories' )->numParams( count( $allCats['hidden'] ) )->escaped() .
 496                                 $colon . '<ul>' . $embed . implode( "{$pop}{$embed}", $allCats['hidden'] ) . $pop . '</ul>' .
 497                                 '</div>';
 498                 }
 499
 500                 # optional 'dmoz-like' category browser. Will be shown under the list
 501                 # of categories an article belong to
 502                 if ( $wgUseCategoryBrowser ) {
 503                         $s .= '<br /><hr />';
 504
 505                         # get a big array of the parents tree
 506                         $parenttree = $this->getTitle()->getParentCategoryTree();
 507                         # Skin object passed by reference cause it can not be
 508                         # accessed under the method subfunction drawCategoryBrowser
 509                         $tempout = explode( "\n", $this->drawCategoryBrowser( $parenttree ) );
 510                         # Clean out bogus first entry and sort them
 511                         unset( $tempout[0] );
 512                         asort( $tempout );
 513                         # Output one per line
 514                         $s .= implode( "<br />\n", $tempout );
 515                 }
 516
 517                 return $s;
 518         }
 519
 520         /**
 521          * Render the array as a series of links.
 522          * @param array $tree Categories tree returned by Title::getParentCategoryTree
 523          * @return string Separated by &gt;, terminate with "\n"
 524          */
 525         function drawCategoryBrowser( $tree ) {
 526                 $return = '';
 527
 528                 foreach ( $tree as $element => $parent ) {
 529                         if ( empty( $parent ) ) {
 530                                 # element start a new list
 531                                 $return .= "\n";
 532                         } else {
 533                                 # grab the others elements
 534                                 $return .= $this->drawCategoryBrowser( $parent ) . ' &gt; ';
 535                         }
 536
 537                         # add our current element to the list
 538                         $eltitle = Title::newFromText( $element );
 539                         $return .= Linker::link( $eltitle, htmlspecialchars( $eltitle->getText() ) );
 540                 }
 541
 542                 return $return;
 543         }
 544
 545         /**
 546          * @return string
 547          */
 548         function getCategories() {
 549                 $out = $this->getOutput();
 550
 551                 $catlinks = $this->getCategoryLinks();
 552
 553                 $classes = 'catlinks';
 554
 555                 // Check what we're showing
 556                 $allCats = $out->getCategoryLinks();
 557                 $showHidden = $this->getUser()->getBoolOption( 'showhiddencats' ) ||
 558                                                 $this->getTitle()->getNamespace() == NS_CATEGORY;
 559
 560                 if ( empty( $allCats['normal'] ) && !( !empty( $allCats['hidden'] ) && $showHidden ) ) {
 561                         $classes .= ' catlinks-allhidden';
 562                 }
 563
 564                 return "<div id='catlinks' class='$classes'>{$catlinks}</div>";
 565         }
 566
 567         /**
 568          * This runs a hook to allow extensions placing their stuff after content
 569          * and article metadata (e.g. categories).
 570          * Note: This function has nothing to do with afterContent().
 571          *
 572          * This hook is placed here in order to allow using the same hook for all
 573          * skins, both the SkinTemplate based ones and the older ones, which directly
 574          * use this class to get their data.
 575          *
 576          * The output of this function gets processed in SkinTemplate::outputPage() for
 577          * the SkinTemplate based skins, all other skins should directly echo it.
 578          *
 579          * @return string Empty by default, if not changed by any hook function.
 580          */
 581         protected function afterContentHook() {
 582                 $data = '';
 583
 584                 if ( Hooks::run( 'SkinAfterContent', array( &$data, $this ) ) ) {
 585                         // adding just some spaces shouldn't toggle the output
 586                         // of the whole <div/>, so we use trim() here
 587                         if ( trim( $data ) != '' ) {
 588                                 // Doing this here instead of in the skins to
 589                                 // ensure that the div has the same ID in all
 590                                 // skins
 591                                 $data = "<div id='mw-data-after-content'>\n" .
 592                                         "\t$data\n" .
 593                                         "</div>\n";
 594                         }
 595                 } else {
 596                         wfDebug( "Hook SkinAfterContent changed output processing.\n" );
 597                 }
 598
 599                 return $data;
 600         }
 601
 602         /**
 603          * Generate debug data HTML for displaying at the bottom of the main content
 604          * area.
 605          * @return string HTML containing debug data, if enabled (otherwise empty).
 606          */
 607         protected function generateDebugHTML() {
 608                 return MWDebug::getHTMLDebugLog();
 609         }
 610
 611         /**
 612          * This gets called shortly before the "</body>" tag.
 613          *
 614          * @return string HTML-wrapped JS code to be put before "</body>"
 615          */
 616         function bottomScripts() {
 617                 // TODO and the suckage continues. This function is really just a wrapper around
 618                 // OutputPage::getBottomScripts() which takes a Skin param. This should be cleaned
 619                 // up at some point
 620                 $bottomScriptText = $this->getOutput()->getBottomScripts();
 621                 Hooks::run( 'SkinAfterBottomScripts', array( $this, &$bottomScriptText ) );
 622
 623                 return $bottomScriptText;
 624         }
 625
 626         /**
 627          * Text with the permalink to the source page,
 628          * usually shown on the footer of a printed page
 629          *
 630          * @return string HTML text with an URL
 631          */
 632         function printSource() {
 633                 $oldid = $this->getRevisionId();
 634                 if ( $oldid ) {
 635                         $canonicalUrl = $this->getTitle()->getCanonicalURL( 'oldid=' . $oldid );
 636                         $url = htmlspecialchars( wfExpandIRI( $canonicalUrl ) );
 637                 } else {
 638                         // oldid not available for non existing pages
 639                         $url = htmlspecialchars( wfExpandIRI( $this->getTitle()->getCanonicalURL() ) );
 640                 }
 641
 642                 return $this->msg( 'retrievedfrom' )
 643                         ->rawParams( '<a dir="ltr" href="' . $url . '">' . $url . '</a>' )
 644                         ->parse();
 645         }
 646
 647         /**
 648          * @return string HTML
 649          */
 650         function getUndeleteLink() {
 651                 $action = $this->getRequest()->getVal( 'action', 'view' );
 652
 653                 if ( $this->getTitle()->userCan( 'deletedhistory', $this->getUser() ) &&
 654                         ( !$this->getTitle()->exists() || $action == 'history' ) ) {
 655                         $n = $this->getTitle()->isDeleted();
 656
 657                         if ( $n ) {
 658                                 if ( $this->getTitle()->quickUserCan( 'undelete', $this->getUser() ) ) {
 659                                         $msg = 'thisisdeleted';
 660                                 } else {
 661                                         $msg = 'viewdeleted';
 662                                 }
 663
 664                                 return $this->msg( $msg )->rawParams(
 665                                         Linker::linkKnown(
 666                                                 SpecialPage::getTitleFor( 'Undelete', $this->getTitle()->getPrefixedDBkey() ),
 667                                                 $this->msg( 'restorelink' )->numParams( $n )->escaped() )
 668                                         )->escaped();
 669                         }
 670                 }
 671
 672                 return '';
 673         }
 674
 675         /**
 676          * @return string
 677          */
 678         function subPageSubtitle() {
 679                 $out = $this->getOutput();
 680                 $subpages = '';
 681
 682                 if ( !Hooks::run( 'SkinSubPageSubtitle', array( &$subpages, $this, $out ) ) ) {
 683                         return $subpages;
 684                 }
 685
 686                 if ( $out->isArticle() && MWNamespace::hasSubpages( $out->getTitle()->getNamespace() ) ) {
 687                         $ptext = $this->getTitle()->getPrefixedText();
 688                         if ( preg_match( '/\//', $ptext ) ) {
 689                                 $links = explode( '/', $ptext );
 690                                 array_pop( $links );
 691                                 $c = 0;
 692                                 $growinglink = '';
 693                                 $display = '';
 694                                 $lang = $this->getLanguage();
 695
 696                                 foreach ( $links as $link ) {
 697                                         $growinglink .= $link;
 698                                         $display .= $link;
 699                                         $linkObj = Title::newFromText( $growinglink );
 700
 701                                         if ( is_object( $linkObj ) && $linkObj->isKnown() ) {
 702                                                 $getlink = Linker::linkKnown(
 703                                                         $linkObj,
 704                                                         htmlspecialchars( $display )
 705                                                 );
 706
 707                                                 $c++;
 708
 709                                                 if ( $c > 1 ) {
 710                                                         $subpages .= $lang->getDirMarkEntity() . $this->msg( 'pipe-separator' )->escaped();
 711                                                 } else {
 712                                                         $subpages .= '&lt; ';
 713                                                 }
 714
 715                                                 $subpages .= $getlink;
 716                                                 $display = '';
 717                                         } else {
 718                                                 $display .= '/';
 719                                         }
 720                                         $growinglink .= '/';
 721                                 }
 722                         }
 723                 }
 724
 725                 return $subpages;
 726         }
 727
 728         /**
 729          * Returns true if the IP should be shown in the header
 730          * @return bool
 731          */
 732         function showIPinHeader() {
 733                 global $wgShowIPinHeader;
 734                 return $wgShowIPinHeader && session_id() != '';
 735         }
 736
 737         /**
 738          * @return string
 739          */
 740         function getSearchLink() {
 741                 $searchPage = SpecialPage::getTitleFor( 'Search' );
 742                 return $searchPage->getLocalURL();
 743         }
 744
 745         /**
 746          * @return string
 747          */
 748         function escapeSearchLink() {
 749                 return htmlspecialchars( $this->getSearchLink() );
 750         }
 751
 752         /**
 753          * @param string $type
 754          * @return string
 755          */
 756         function getCopyright( $type = 'detect' ) {
 757                 global $wgRightsPage, $wgRightsUrl, $wgRightsText;
 758
 759                 if ( $type == 'detect' ) {
 760                         if ( !$this->isRevisionCurrent()
 761                                 && !$this->msg( 'history_copyright' )->inContentLanguage()->isDisabled()
 762                         ) {
 763                                 $type = 'history';
 764                         } else {
 765                                 $type = 'normal';
 766                         }
 767                 }
 768
 769                 if ( $type == 'history' ) {
 770                         $msg = 'history_copyright';
 771                 } else {
 772                         $msg = 'copyright';
 773                 }
 774
 775                 if ( $wgRightsPage ) {
 776                         $title = Title::newFromText( $wgRightsPage );
 777                         $link = Linker::linkKnown( $title, $wgRightsText );
 778                 } elseif ( $wgRightsUrl ) {
 779                         $link = Linker::makeExternalLink( $wgRightsUrl, $wgRightsText );
 780                 } elseif ( $wgRightsText ) {
 781                         $link = $wgRightsText;
 782                 } else {
 783                         # Give up now
 784                         return '';
 785                 }
 786
 787                 // Allow for site and per-namespace customization of copyright notice.
 788                 // @todo Remove deprecated $forContent param from hook handlers and then remove here.
 789                 $forContent = true;
 790
 791                 Hooks::run(
 792                         'SkinCopyrightFooter',
 793                         array( $this->getTitle(), $type, &$msg, &$link, &$forContent )
 794                 );
 795
 796                 return $this->msg( $msg )->rawParams( $link )->text();
 797         }
 798
 799         /**
 800          * @return null|string
 801          */
 802         function getCopyrightIcon() {
 803                 global $wgRightsUrl, $wgRightsText, $wgRightsIcon, $wgCopyrightIcon;
 804
 805                 $out = '';
 806
 807                 if ( $wgCopyrightIcon ) {
 808                         $out = $wgCopyrightIcon;
 809                 } elseif ( $wgRightsIcon ) {
 810                         $icon = htmlspecialchars( $wgRightsIcon );
 811
 812                         if ( $wgRightsUrl ) {
 813                                 $url = htmlspecialchars( $wgRightsUrl );
 814                                 $out .= '<a href="' . $url . '">';
 815                         }
 816
 817                         $text = htmlspecialchars( $wgRightsText );
 818                         $out .= "<img src=\"$icon\" alt=\"$text\" width=\"88\" height=\"31\" />";
 819
 820                         if ( $wgRightsUrl ) {
 821                                 $out .= '</a>';
 822                         }
 823                 }
 824
 825                 return $out;
 826         }
 827
 828         /**
 829          * Gets the powered by MediaWiki icon.
 830          * @return string
 831          */
 832         function getPoweredBy() {
 833                 global $wgResourceBasePath;
 834
 835                 $url1 = htmlspecialchars(
 836                         "$wgResourceBasePath/resources/assets/poweredby_mediawiki_88x31.png"
 837                 );
 838                 $url1_5 = htmlspecialchars(
 839                         "$wgResourceBasePath/resources/assets/poweredby_mediawiki_132x47.png"
 840                 );
 841                 $url2 = htmlspecialchars(
 842                         "$wgResourceBasePath/resources/assets/poweredby_mediawiki_176x62.png"
 843                 );
 844                 $text = '<a href="//www.mediawiki.org/"><img src="' . $url1
 845                         . '" srcset="' . $url1_5 . ' 1.5x, ' . $url2 . ' 2x" '
 846                         . 'height="31" width="88" alt="Powered by MediaWiki" /></a>';
 847                 Hooks::run( 'SkinGetPoweredBy', array( &$text, $this ) );
 848                 return $text;
 849         }
 850
 851         /**
 852          * Get the timestamp of the latest revision, formatted in user language
 853          *
 854          * @return string
 855          */
 856         protected function lastModified() {
 857                 $timestamp = $this->getOutput()->getRevisionTimestamp();
 858
 859                 # No cached timestamp, load it from the database
 860                 if ( $timestamp === null ) {
 861                         $timestamp = Revision::getTimestampFromId( $this->getTitle(), $this->getRevisionId() );
 862                 }
 863
 864                 if ( $timestamp ) {
 865                         $d = $this->getLanguage()->userDate( $timestamp, $this->getUser() );
 866                         $t = $this->getLanguage()->userTime( $timestamp, $this->getUser() );
 867                         $s = ' ' . $this->msg( 'lastmodifiedat', $d, $t )->parse();
 868                 } else {
 869                         $s = '';
 870                 }
 871
 872                 if ( wfGetLB()->getLaggedSlaveMode() ) {
 873                         $s .= ' <strong>' . $this->msg( 'laggedslavemode' )->parse() . '</strong>';
 874                 }
 875
 876                 return $s;
 877         }
 878
 879         /**
 880          * @param string $align
 881          * @return string
 882          */
 883         function logoText( $align = '' ) {
 884                 if ( $align != '' ) {
 885                         $a = " style='float: {$align};'";
 886                 } else {
 887                         $a = '';
 888                 }
 889
 890                 $mp = $this->msg( 'mainpage' )->escaped();
 891                 $mptitle = Title::newMainPage();
 892                 $url = ( is_object( $mptitle ) ? htmlspecialchars( $mptitle->getLocalURL() ) : '' );
 893
 894                 $logourl = $this->getLogo();
 895                 $s = "<a href='{$url}'><img{$a} src='{$logourl}' alt='[{$mp}]' /></a>";
 896
 897                 return $s;
 898         }
 899
 900         /**
 901          * Renders a $wgFooterIcons icon according to the method's arguments
 902          * @param array $icon The icon to build the html for, see $wgFooterIcons
 903          *   for the format of this array.
 904          * @param bool|string $withImage Whether to use the icon's image or output
 905          *   a text-only footericon.
 906          * @return string HTML
 907          */
 908         function makeFooterIcon( $icon, $withImage = 'withImage' ) {
 909                 if ( is_string( $icon ) ) {
 910                         $html = $icon;
 911                 } else { // Assuming array
 912                         $url = isset( $icon["url"] ) ? $icon["url"] : null;
 913                         unset( $icon["url"] );
 914                         if ( isset( $icon["src"] ) && $withImage === 'withImage' ) {
 915                                 // do this the lazy way, just pass icon data as an attribute array
 916                                 $html = Html::element( 'img', $icon );
 917                         } else {
 918                                 $html = htmlspecialchars( $icon["alt"] );
 919                         }
 920                         if ( $url ) {
 921                                 $html = Html::rawElement( 'a', array( "href" => $url ), $html );
 922                         }
 923                 }
 924                 return $html;
 925         }
 926
 927         /**
 928          * Gets the link to the wiki's main page.
 929          * @return string
 930          */
 931         function mainPageLink() {
 932                 $s = Linker::linkKnown(
 933                         Title::newMainPage(),
 934                         $this->msg( 'mainpage' )->escaped()
 935                 );
 936
 937                 return $s;
 938         }
 939
 940         /**
 941          * Returns an HTML link for use in the footer
 942          * @param string $desc The i18n message key for the link text
 943          * @param string $page The i18n message key for the page to link to
 944          * @return string HTML anchor
 945          */
 946         public function footerLink( $desc, $page ) {
 947                 // if the link description has been set to "-" in the default language,
 948                 if ( $this->msg( $desc )->inContentLanguage()->isDisabled() ) {
 949                         // then it is disabled, for all languages.
 950                         return '';
 951                 } else {
 952                         // Otherwise, we display the link for the user, described in their
 953                         // language (which may or may not be the same as the default language),
 954                         // but we make the link target be the one site-wide page.
 955                         $title = Title::newFromText( $this->msg( $page )->inContentLanguage()->text() );
 956
 957                         if ( !$title ) {
 958                                 return '';
 959                         }
 960
 961                         return Linker::linkKnown(
 962                                 $title,
 963                                 $this->msg( $desc )->escaped()
 964                         );
 965                 }
 966         }
 967
 968         /**
 969          * Gets the link to the wiki's privacy policy page.
 970          * @return string HTML
 971          */
 972         function privacyLink() {
 973                 return $this->footerLink( 'privacy', 'privacypage' );
 974         }
 975
 976         /**
 977          * Gets the link to the wiki's about page.
 978          * @return string HTML
 979          */
 980         function aboutLink() {
 981                 return $this->footerLink( 'aboutsite', 'aboutpage' );
 982         }
 983
 984         /**
 985          * Gets the link to the wiki's general disclaimers page.
 986          * @return string HTML
 987          */
 988         function disclaimerLink() {
 989                 return $this->footerLink( 'disclaimers', 'disclaimerpage' );
 990         }
 991
 992         /**
 993          * Return URL options for the 'edit page' link.
 994          * This may include an 'oldid' specifier, if the current page view is such.
 995          *
 996          * @return array
 997          * @private
 998          */
 999         function editUrlOptions() {
1000                 $options = array( 'action' => 'edit' );
1001
1002                 if ( !$this->isRevisionCurrent() ) {
1003                         $options['oldid'] = intval( $this->getRevisionId() );
1004                 }
1005
1006                 return $options;
1007         }
1008
1009         /**
1010          * @param User|int $id
1011          * @return bool
1012          */
1013         function showEmailUser( $id ) {
1014                 if ( $id instanceof User ) {
1015                         $targetUser = $id;
1016                 } else {
1017                         $targetUser = User::newFromId( $id );
1018                 }
1019
1020                 # The sending user must have a confirmed email address and the target
1021                 # user must have a confirmed email address and allow emails from users.
1022                 return $this->getUser()->canSendEmail() &&
1023                         $targetUser->canReceiveEmail();
1024         }
1025
1026         /**
1027          * This function previously returned a fully resolved style path URL to images or styles stored in
1028          * the legacy skins/common/ directory.
1029          *
1030          * That directory has been removed in 1.24 and the function always returns an empty string.
1031          *
1032          * @deprecated since 1.24
1033          * @param string $name The name or path of a skin resource file
1034          * @return string Empty string
1035          */
1036         function getCommonStylePath( $name ) {
1037                 wfDeprecated( __METHOD__, '1.24' );
1038                 return '';
1039         }
1040
1041         /**
1042          * Return a fully resolved style path url to images or styles stored in the current skins's folder.
1043          * This method returns a url resolved using the configured skin style path
1044          * and includes the style version inside of the url.
1045          *
1046          * Requires $stylename to be set, otherwise throws MWException.
1047          *
1048          * @param string $name The name or path of a skin resource file
1049          * @return string The fully resolved style path url including styleversion
1050          * @throws MWException
1051          */
1052         function getSkinStylePath( $name ) {
1053                 global $wgStylePath, $wgStyleVersion;
1054
1055                 if ( $this->stylename === null ) {
1056                         $class = get_class( $this );
1057                         throw new MWException( "$class::\$stylename must be set to use getSkinStylePath()" );
1058                 }
1059
1060                 return "$wgStylePath/{$this->stylename}/$name?$wgStyleVersion";
1061         }
1062
1063         /* these are used extensively in SkinTemplate, but also some other places */
1064
1065         /**
1066          * @param string $urlaction
1067          * @return string
1068          */
1069         static function makeMainPageUrl( $urlaction = '' ) {
1070                 $title = Title::newMainPage();
1071                 self::checkTitle( $title, '' );
1072
1073                 return $title->getLocalURL( $urlaction );
1074         }
1075
1076         /**
1077          * Make a URL for a Special Page using the given query and protocol.
1078          *
1079          * If $proto is set to null, make a local URL. Otherwise, make a full
1080          * URL with the protocol specified.
1081          *
1082          * @param string $name Name of the Special page
1083          * @param string $urlaction Query to append
1084          * @param string|null $proto Protocol to use or null for a local URL
1085          * @return string
1086          */
1087         static function makeSpecialUrl( $name, $urlaction = '', $proto = null ) {
1088                 $title = SpecialPage::getSafeTitleFor( $name );
1089                 if ( is_null( $proto ) ) {
1090                         return $title->getLocalURL( $urlaction );
1091                 } else {
1092                         return $title->getFullURL( $urlaction, false, $proto );
1093                 }
1094         }
1095
1096         /**
1097          * @param string $name
1098          * @param string $subpage
1099          * @param string $urlaction
1100          * @return string
1101          */
1102         static function makeSpecialUrlSubpage( $name, $subpage, $urlaction = '' ) {
1103                 $title = SpecialPage::getSafeTitleFor( $name, $subpage );
1104                 return $title->getLocalURL( $urlaction );
1105         }
1106
1107         /**
1108          * @param string $name
1109          * @param string $urlaction
1110          * @return string
1111          */
1112         static function makeI18nUrl( $name, $urlaction = '' ) {
1113                 $title = Title::newFromText( wfMessage( $name )->inContentLanguage()->text() );
1114                 self::checkTitle( $title, $name );
1115                 return $title->getLocalURL( $urlaction );
1116         }
1117
1118         /**
1119          * @param string $name
1120          * @param string $urlaction
1121          * @return string
1122          */
1123         static function makeUrl( $name, $urlaction = '' ) {
1124                 $title = Title::newFromText( $name );
1125                 self::checkTitle( $title, $name );
1126
1127                 return $title->getLocalURL( $urlaction );
1128         }
1129
1130         /**
1131          * If url string starts with http, consider as external URL, else
1132          * internal
1133          * @param string $name
1134          * @return string URL
1135          */
1136         static function makeInternalOrExternalUrl( $name ) {
1137                 if ( preg_match( '/^(?i:' . wfUrlProtocols() . ')/', $name ) ) {
1138                         return $name;
1139                 } else {
1140                         return self::makeUrl( $name );
1141                 }
1142         }
1143
1144         /**
1145          * this can be passed the NS number as defined in Language.php
1146          * @param string $name
1147          * @param string $urlaction
1148          * @param int $namespace
1149          * @return string
1150          */
1151         static function makeNSUrl( $name, $urlaction = '', $namespace = NS_MAIN ) {
1152                 $title = Title::makeTitleSafe( $namespace, $name );
1153                 self::checkTitle( $title, $name );
1154
1155                 return $title->getLocalURL( $urlaction );
1156         }
1157
1158         /**
1159          * these return an array with the 'href' and boolean 'exists'
1160          * @param string $name
1161          * @param string $urlaction
1162          * @return array
1163          */
1164         static function makeUrlDetails( $name, $urlaction = '' ) {
1165                 $title = Title::newFromText( $name );
1166                 self::checkTitle( $title, $name );
1167
1168                 return array(
1169                         'href' => $title->getLocalURL( $urlaction ),
1170                         'exists' => $title->isKnown(),
1171                 );
1172         }
1173
1174         /**
1175          * Make URL details where the article exists (or at least it's convenient to think so)
1176          * @param string $name Article name
1177          * @param string $urlaction
1178          * @return array
1179          */
1180         static function makeKnownUrlDetails( $name, $urlaction = '' ) {
1181                 $title = Title::newFromText( $name );
1182                 self::checkTitle( $title, $name );
1183
1184                 return array(
1185                         'href' => $title->getLocalURL( $urlaction ),
1186                         'exists' => true
1187                 );
1188         }
1189
1190         /**
1191          * make sure we have some title to operate on
1192          *
1193          * @param Title $title
1194          * @param string $name
1195          */
1196         static function checkTitle( &$title, $name ) {
1197                 if ( !is_object( $title ) ) {
1198                         $title = Title::newFromText( $name );
1199                         if ( !is_object( $title ) ) {
1200                                 $title = Title::newFromText( '--error: link target missing--' );
1201                         }
1202                 }
1203         }
1204
1205         /**
1206          * Build an array that represents the sidebar(s), the navigation bar among them.
1207          *
1208          * BaseTemplate::getSidebar can be used to simplify the format and id generation in new skins.
1209          *
1210          * The format of the returned array is array( heading => content, ... ), where:
1211          * - heading is the heading of a navigation portlet. It is either:
1212          *   - magic string to be handled by the skins ('SEARCH' / 'LANGUAGES' / 'TOOLBOX' / ...)
1213          *   - a message name (e.g. 'navigation'), the message should be HTML-escaped by the skin
1214          *   - plain text, which should be HTML-escaped by the skin
1215          * - content is the contents of the portlet. It is either:
1216          *   - HTML text (<ul><li>...</li>...</ul>)
1217          *   - array of link data in a format accepted by BaseTemplate::makeListItem()
1218          *   - (for a magic string as a key, any value)
1219          *
1220          * Note that extensions can control the sidebar contents using the SkinBuildSidebar hook
1221          * and can technically insert anything in here; skin creators are expected to handle
1222          * values described above.
1223          *
1224          * @return array
1225          */
1226         function buildSidebar() {
1227                 global $wgEnableSidebarCache, $wgSidebarCacheExpiry;
1228
1229                 $cache = ObjectCache::getMainWANInstance();
1230                 $key = wfMemcKey( 'sidebar', $this->getLanguage()->getCode() );
1231
1232                 if ( $wgEnableSidebarCache ) {
1233                         $cachedsidebar = $cache->get( $key );
1234                         if ( $cachedsidebar ) {
1235                                 Hooks::run( 'SidebarBeforeOutput', array( $this, &$cachedsidebar ) );
1236
1237                                 return $cachedsidebar;
1238                         }
1239                 }
1240
1241                 $bar = array();
1242                 $this->addToSidebar( $bar, 'sidebar' );
1243
1244                 Hooks::run( 'SkinBuildSidebar', array( $this, &$bar ) );
1245                 if ( $wgEnableSidebarCache ) {
1246                         $cache->set( $key, $bar, $wgSidebarCacheExpiry );
1247                 }
1248
1249                 Hooks::run( 'SidebarBeforeOutput', array( $this, &$bar ) );
1250
1251                 return $bar;
1252         }
1253
1254         /**
1255          * Add content from a sidebar system message
1256          * Currently only used for MediaWiki:Sidebar (but may be used by Extensions)
1257          *
1258          * This is just a wrapper around addToSidebarPlain() for backwards compatibility
1259          *
1260          * @param array $bar
1261          * @param string $message
1262          */
1263         function addToSidebar( &$bar, $message ) {
1264                 $this->addToSidebarPlain( $bar, wfMessage( $message )->inContentLanguage()->plain() );
1265         }
1266
1267         /**
1268          * Add content from plain text
1269          * @since 1.17
1270          * @param array $bar
1271          * @param string $text
1272          * @return array
1273          */
1274         function addToSidebarPlain( &$bar, $text ) {
1275                 $lines = explode( "\n", $text );
1276
1277                 $heading = '';
1278
1279                 foreach ( $lines as $line ) {
1280                         if ( strpos( $line, '*' ) !== 0 ) {
1281                                 continue;
1282                         }
1283                         $line = rtrim( $line, "\r" ); // for Windows compat
1284
1285                         if ( strpos( $line, '**' ) !== 0 ) {
1286                                 $heading = trim( $line, '* ' );
1287                                 if ( !array_key_exists( $heading, $bar ) ) {
1288                                         $bar[$heading] = array();
1289                                 }
1290                         } else {
1291                                 $line = trim( $line, '* ' );
1292
1293                                 if ( strpos( $line, '|' ) !== false ) { // sanity check
1294                                         $line = MessageCache::singleton()->transform( $line, false, null, $this->getTitle() );
1295                                         $line = array_map( 'trim', explode( '|', $line, 2 ) );
1296                                         if ( count( $line ) !== 2 ) {
1297                                                 // Second sanity check, could be hit by people doing
1298                                                 // funky stuff with parserfuncs... (bug 33321)
1299                                                 continue;
1300                                         }
1301
1302                                         $extraAttribs = array();
1303
1304                                         $msgLink = $this->msg( $line[0] )->inContentLanguage();
1305                                         if ( $msgLink->exists() ) {
1306                                                 $link = $msgLink->text();
1307                                                 if ( $link == '-' ) {
1308                                                         continue;
1309                                                 }
1310                                         } else {
1311                                                 $link = $line[0];
1312                                         }
1313                                         $msgText = $this->msg( $line[1] );
1314                                         if ( $msgText->exists() ) {
1315                                                 $text = $msgText->text();
1316                                         } else {
1317                                                 $text = $line[1];
1318                                         }
1319
1320                                         if ( preg_match( '/^(?i:' . wfUrlProtocols() . ')/', $link ) ) {
1321                                                 $href = $link;
1322
1323                                                 // Parser::getExternalLinkAttribs won't work here because of the Namespace things
1324                                                 global $wgNoFollowLinks, $wgNoFollowDomainExceptions;
1325                                                 if ( $wgNoFollowLinks && !wfMatchesDomainList( $href, $wgNoFollowDomainExceptions ) ) {
1326                                                         $extraAttribs['rel'] = 'nofollow';
1327                                                 }
1328
1329                                                 global $wgExternalLinkTarget;
1330                                                 if ( $wgExternalLinkTarget ) {
1331                                                         $extraAttribs['target'] = $wgExternalLinkTarget;
1332                                                 }
1333                                         } else {
1334                                                 $title = Title::newFromText( $link );
1335
1336                                                 if ( $title ) {
1337                                                         $title = $title->fixSpecialName();
1338                                                         $href = $title->getLinkURL();
1339                                                 } else {
1340                                                         $href = 'INVALID-TITLE';
1341                                                 }
1342                                         }
1343
1344                                         $bar[$heading][] = array_merge( array(
1345                                                 'text' => $text,
1346                                                 'href' => $href,
1347                                                 'id' => 'n-' . Sanitizer::escapeId( strtr( $line[1], ' ', '-' ), 'noninitial' ),
1348                                                 'active' => false
1349                                         ), $extraAttribs );
1350                                 } else {
1351                                         continue;
1352                                 }
1353                         }
1354                 }
1355
1356                 return $bar;
1357         }
1358
1359         /**
1360          * This function previously controlled whether the 'mediawiki.legacy.wikiprintable' module
1361          * should be loaded by OutputPage. That module no longer exists and the return value of this
1362          * method is ignored.
1363          *
1364          * If your skin doesn't provide its own print styles, the 'mediawiki.legacy.commonPrint' module
1365          * can be used instead (SkinTemplate-based skins do it automatically).
1366          *
1367          * @deprecated since 1.22
1368          * @return bool
1369          */
1370         public function commonPrintStylesheet() {
1371                 wfDeprecated( __METHOD__, '1.22' );
1372                 return false;
1373         }
1374
1375         /**
1376          * Gets new talk page messages for the current user and returns an
1377          * appropriate alert message (or an empty string if there are no messages)
1378          * @return string
1379          */
1380         function getNewtalks() {
1381
1382                 $newMessagesAlert = '';
1383                 $user = $this->getUser();
1384                 $newtalks = $user->getNewMessageLinks();
1385                 $out = $this->getOutput();
1386
1387                 // Allow extensions to disable or modify the new messages alert
1388                 if ( !Hooks::run( 'GetNewMessagesAlert', array( &$newMessagesAlert, $newtalks, $user, $out ) ) ) {
1389                         return '';
1390                 }
1391                 if ( $newMessagesAlert ) {
1392                         return $newMessagesAlert;
1393                 }
1394
1395                 if ( count( $newtalks ) == 1 && $newtalks[0]['wiki'] === wfWikiID() ) {
1396                         $uTalkTitle = $user->getTalkPage();
1397                         $lastSeenRev = isset( $newtalks[0]['rev'] ) ? $newtalks[0]['rev'] : null;
1398                         $nofAuthors = 0;
1399                         if ( $lastSeenRev !== null ) {
1400                                 $plural = true; // Default if we have a last seen revision: if unknown, use plural
1401                                 $latestRev = Revision::newFromTitle( $uTalkTitle, false, Revision::READ_NORMAL );
1402                                 if ( $latestRev !== null ) {
1403                                         // Singular if only 1 unseen revision, plural if several unseen revisions.
1404                                         $plural = $latestRev->getParentId() !== $lastSeenRev->getId();
1405                                         $nofAuthors = $uTalkTitle->countAuthorsBetween(
1406                                                 $lastSeenRev, $latestRev, 10, 'include_new' );
1407                                 }
1408                         } else {
1409                                 // Singular if no revision -> diff link will show latest change only in any case
1410                                 $plural = false;
1411                         }
1412                         $plural = $plural ? 999 : 1;
1413                         // 999 signifies "more than one revision". We don't know how many, and even if we did,
1414                         // the number of revisions or authors is not necessarily the same as the number of
1415                         // "messages".
1416                         $newMessagesLink = Linker::linkKnown(
1417                                 $uTalkTitle,
1418                                 $this->msg( 'newmessageslinkplural' )->params( $plural )->escaped(),
1419                                 array(),
1420                                 array( 'redirect' => 'no' )
1421                         );
1422
1423                         $newMessagesDiffLink = Linker::linkKnown(
1424                                 $uTalkTitle,
1425                                 $this->msg( 'newmessagesdifflinkplural' )->params( $plural )->escaped(),
1426                                 array(),
1427                                 $lastSeenRev !== null
1428                                         ? array( 'oldid' => $lastSeenRev->getId(), 'diff' => 'cur' )
1429                                         : array( 'diff' => 'cur' )
1430                         );
1431
1432                         if ( $nofAuthors >= 1 && $nofAuthors <= 10 ) {
1433                                 $newMessagesAlert = $this->msg(
1434                                         'youhavenewmessagesfromusers',
1435                                         $newMessagesLink,
1436                                         $newMessagesDiffLink
1437                                 )->numParams( $nofAuthors, $plural );
1438                         } else {
1439                                 // $nofAuthors === 11 signifies "11 or more" ("more than 10")
1440                                 $newMessagesAlert = $this->msg(
1441                                         $nofAuthors > 10 ? 'youhavenewmessagesmanyusers' : 'youhavenewmessages',
1442                                         $newMessagesLink,
1443                                         $newMessagesDiffLink
1444                                 )->numParams( $plural );
1445                         }
1446                         $newMessagesAlert = $newMessagesAlert->text();
1447                         # Disable Squid cache
1448                         $out->setSquidMaxage( 0 );
1449                 } elseif ( count( $newtalks ) ) {
1450                         $sep = $this->msg( 'newtalkseparator' )->escaped();
1451                         $msgs = array();
1452
1453                         foreach ( $newtalks as $newtalk ) {
1454                                 $msgs[] = Xml::element(
1455                                         'a',
1456                                         array( 'href' => $newtalk['link'] ), $newtalk['wiki']
1457                                 );
1458                         }
1459                         $parts = implode( $sep, $msgs );
1460                         $newMessagesAlert = $this->msg( 'youhavenewmessagesmulti' )->rawParams( $parts )->escaped();
1461                         $out->setSquidMaxage( 0 );
1462                 }
1463
1464                 return $newMessagesAlert;
1465         }
1466
1467         /**
1468          * Get a cached notice
1469          *
1470          * @param string $name Message name, or 'default' for $wgSiteNotice
1471          * @return string|bool HTML fragment, or false to indicate that the caller
1472          *   should fall back to the next notice in its sequence
1473          */
1474         private function getCachedNotice( $name ) {
1475                 global $wgRenderHashAppend, $parserMemc, $wgContLang;
1476
1477                 $needParse = false;
1478
1479                 if ( $name === 'default' ) {
1480                         // special case
1481                         global $wgSiteNotice;
1482                         $notice = $wgSiteNotice;
1483                         if ( empty( $notice ) ) {
1484                                 return false;
1485                         }
1486                 } else {
1487                         $msg = $this->msg( $name )->inContentLanguage();
1488                         if ( $msg->isBlank() ) {
1489                                 return '';
1490                         } elseif ( $msg->isDisabled() ) {
1491                                 return false;
1492                         }
1493                         $notice = $msg->plain();
1494                 }
1495
1496                 // Use the extra hash appender to let eg SSL variants separately cache.
1497                 $key = wfMemcKey( $name . $wgRenderHashAppend );
1498                 $cachedNotice = $parserMemc->get( $key );
1499                 if ( is_array( $cachedNotice ) ) {
1500                         if ( md5( $notice ) == $cachedNotice['hash'] ) {
1501                                 $notice = $cachedNotice['html'];
1502                         } else {
1503                                 $needParse = true;
1504                         }
1505                 } else {
1506                         $needParse = true;
1507                 }
1508
1509                 if ( $needParse ) {
1510                         $parsed = $this->getOutput()->parse( $notice );
1511                         $parserMemc->set( $key, array( 'html' => $parsed, 'hash' => md5( $notice ) ), 600 );
1512                         $notice = $parsed;
1513                 }
1514
1515                 $notice = Html::rawElement( 'div', array( 'id' => 'localNotice',
1516                         'lang' => $wgContLang->getHtmlCode(), 'dir' => $wgContLang->getDir() ), $notice );
1517                 return $notice;
1518         }
1519
1520         /**
1521          * Get a notice based on page's namespace
1522          *
1523          * @return string HTML fragment
1524          */
1525         function getNamespaceNotice() {
1526
1527                 $key = 'namespacenotice-' . $this->getTitle()->getNsText();
1528                 $namespaceNotice = $this->getCachedNotice( $key );
1529                 if ( $namespaceNotice && substr( $namespaceNotice, 0, 7 ) != '<p>&lt;' ) {
1530                         $namespaceNotice = '<div id="namespacebanner">' . $namespaceNotice . '</div>';
1531                 } else {
1532                         $namespaceNotice = '';
1533                 }
1534
1535                 return $namespaceNotice;
1536         }
1537
1538         /**
1539          * Get the site notice
1540          *
1541          * @return string HTML fragment
1542          */
1543         function getSiteNotice() {
1544                 $siteNotice = '';
1545
1546                 if ( Hooks::run( 'SiteNoticeBefore', array( &$siteNotice, $this ) ) ) {
1547                         if ( is_object( $this->getUser() ) && $this->getUser()->isLoggedIn() ) {
1548                                 $siteNotice = $this->getCachedNotice( 'sitenotice' );
1549                         } else {
1550                                 $anonNotice = $this->getCachedNotice( 'anonnotice' );
1551                                 if ( $anonNotice === false ) {
1552                                         $siteNotice = $this->getCachedNotice( 'sitenotice' );
1553                                 } else {
1554                                         $siteNotice = $anonNotice;
1555                                 }
1556                         }
1557                         if ( $siteNotice === false ) {
1558                                 $siteNotice = $this->getCachedNotice( 'default' );
1559                         }
1560                 }
1561
1562                 Hooks::run( 'SiteNoticeAfter', array( &$siteNotice, $this ) );
1563                 return $siteNotice;
1564         }
1565
1566         /**
1567          * Create a section edit link.  This supersedes editSectionLink() and
1568          * editSectionLinkForOther().
1569          *
1570          * @param Title $nt The title being linked to (may not be the same as
1571          *   the current page, if the section is included from a template)
1572          * @param string $section The designation of the section being pointed to,
1573          *   to be included in the link, like "&section=$section"
1574          * @param string $tooltip The tooltip to use for the link: will be escaped
1575          *   and wrapped in the 'editsectionhint' message
1576          * @param string $lang Language code
1577          * @return string HTML to use for edit link
1578          */
1579         public function doEditSectionLink( Title $nt, $section, $tooltip = null, $lang = false ) {
1580                 // HTML generated here should probably have userlangattributes
1581                 // added to it for LTR text on RTL pages
1582
1583                 $lang = wfGetLangObj( $lang );
1584
1585                 $attribs = array();
1586                 if ( !is_null( $tooltip ) ) {
1587                         # Bug 25462: undo double-escaping.
1588                         $tooltip = Sanitizer::decodeCharReferences( $tooltip );
1589                         $attribs['title'] = wfMessage( 'editsectionhint' )->rawParams( $tooltip )
1590                                 ->inLanguage( $lang )->text();
1591                 }
1592
1593                 $links = array(
1594                         'editsection' => array(
1595                                 'text' => wfMessage( 'editsection' )->inLanguage( $lang )->escaped(),
1596                                 'targetTitle' => $nt,
1597                                 'attribs' => $attribs,
1598                                 'query' => array( 'action' => 'edit', 'section' => $section ),
1599                                 'options' => array( 'noclasses', 'known' )
1600                         )
1601                 );
1602
1603                 Hooks::run( 'SkinEditSectionLinks', array( $this, $nt, $section, $tooltip, &$links, $lang ) );
1604
1605                 $result = '<span class="mw-editsection"><span class="mw-editsection-bracket">[</span>';
1606
1607                 $linksHtml = array();
1608                 foreach ( $links as $k => $linkDetails ) {
1609                         $linksHtml[] = Linker::link(
1610                                 $linkDetails['targetTitle'],
1611                                 $linkDetails['text'],
1612                                 $linkDetails['attribs'],
1613                                 $linkDetails['query'],
1614                                 $linkDetails['options']
1615                         );
1616                 }
1617
1618                 $result .= implode(
1619                         '<span class="mw-editsection-divider">'
1620                                 . wfMessage( 'pipe-separator' )->inLanguage( $lang )->text()
1621                                 . '</span>',
1622                         $linksHtml
1623                 );
1624
1625                 $result .= '<span class="mw-editsection-bracket">]</span></span>';
1626                 // Deprecated, use SkinEditSectionLinks hook instead
1627                 Hooks::run(
1628                         'DoEditSectionLink',
1629                         array( $this, $nt, $section, $tooltip, &$result, $lang ),
1630                         '1.25'
1631                 );
1632                 return $result;
1633         }
1634
1635         /**
1636          * Use PHP's magic __call handler to intercept legacy calls to the linker
1637          * for backwards compatibility.
1638          *
1639          * @param string $fname Name of called method
1640          * @param array $args Arguments to the method
1641          * @throws MWException
1642          * @return mixed
1643          */
1644         function __call( $fname, $args ) {
1645                 $realFunction = array( 'Linker', $fname );
1646                 if ( is_callable( $realFunction ) ) {
1647                         wfDeprecated( get_class( $this ) . '::' . $fname, '1.21' );
1648                         return call_user_func_array( $realFunction, $args );
1649                 } else {
1650                         $className = get_class( $this );
1651                         throw new MWException( "Call to undefined method $className::$fname" );
1652                 }
1653         }
1654
1655 }