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, $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 && $wgEnableAPI ) {
 204                         if ( $wgEnableWriteAPI && $user->isLoggedIn()
 205                                 && $user->isAllowedAll( 'writeapi', 'viewmywatchlist', 'editmywatchlist' )
 206                                 && $this->getRelevantTitle()->canExist()
 207                         ) {
 208                                 $modules['watch'][] = 'mediawiki.page.watch.ajax';
 209                         }
 210
 211                         $modules['search'][] = 'mediawiki.searchSuggest';
 212                 }
 213
 214                 if ( $user->getBoolOption( 'editsectiononrightclick' ) ) {
 215                         $modules['user'][] = 'mediawiki.action.view.rightClickEdit';
 216                 }
 217
 218                 // Crazy edit-on-double-click stuff
 219                 if ( $out->isArticle() && $user->getOption( 'editondblclick' ) ) {
 220                         $modules['user'][] = 'mediawiki.action.view.dblClickEdit';
 221                 }
 222                 return $modules;
 223         }
 224
 225         /**
 226          * Preload the existence of three commonly-requested pages in a single query
 227          */
 228         function preloadExistence() {
 229                 $titles = array();
 230
 231                 $user = $this->getUser();
 232                 $title = $this->getRelevantTitle();
 233
 234                 // User/talk link
 235                 if ( $user->isLoggedIn() ) {
 236                         $titles[] = $user->getUserPage();
 237                         $titles[] = $user->getTalkPage();
 238                 }
 239
 240                 // Check, if the page can hold some kind of content, otherwise do nothing
 241                 if ( !$title->canExist() ) {
 242                         // nothing
 243                 } elseif ( $title->isTalkPage() ) {
 244                         $titles[] = $title->getSubjectPage();
 245                 } else {
 246                         $titles[] = $title->getTalkPage();
 247                 }
 248
 249                 Hooks::run( 'SkinPreloadExistence', array( &$titles, $this ) );
 250
 251                 if ( count( $titles ) ) {
 252                         $lb = new LinkBatch( $titles );
 253                         $lb->setCaller( __METHOD__ );
 254                         $lb->execute();
 255                 }
 256         }
 257
 258         /**
 259          * Get the current revision ID
 260          *
 261          * @return int
 262          */
 263         public function getRevisionId() {
 264                 return $this->getOutput()->getRevisionId();
 265         }
 266
 267         /**
 268          * Whether the revision displayed is the latest revision of the page
 269          *
 270          * @return bool
 271          */
 272         public function isRevisionCurrent() {
 273                 $revID = $this->getRevisionId();
 274                 return $revID == 0 || $revID == $this->getTitle()->getLatestRevID();
 275         }
 276
 277         /**
 278          * Set the "relevant" title
 279          * @see self::getRelevantTitle()
 280          * @param Title $t
 281          */
 282         public function setRelevantTitle( $t ) {
 283                 $this->mRelevantTitle = $t;
 284         }
 285
 286         /**
 287          * Return the "relevant" title.
 288          * A "relevant" title is not necessarily the actual title of the page.
 289          * Special pages like Special:MovePage use set the page they are acting on
 290          * as their "relevant" title, this allows the skin system to display things
 291          * such as content tabs which belong to to that page instead of displaying
 292          * a basic special page tab which has almost no meaning.
 293          *
 294          * @return Title
 295          */
 296         public function getRelevantTitle() {
 297                 if ( isset( $this->mRelevantTitle ) ) {
 298                         return $this->mRelevantTitle;
 299                 }
 300                 return $this->getTitle();
 301         }
 302
 303         /**
 304          * Set the "relevant" user
 305          * @see self::getRelevantUser()
 306          * @param User $u
 307          */
 308         public function setRelevantUser( $u ) {
 309                 $this->mRelevantUser = $u;
 310         }
 311
 312         /**
 313          * Return the "relevant" user.
 314          * A "relevant" user is similar to a relevant title. Special pages like
 315          * Special:Contributions mark the user which they are relevant to so that
 316          * things like the toolbox can display the information they usually are only
 317          * able to display on a user's userpage and talkpage.
 318          * @return User
 319          */
 320         public function getRelevantUser() {
 321                 if ( isset( $this->mRelevantUser ) ) {
 322                         return $this->mRelevantUser;
 323                 }
 324                 $title = $this->getRelevantTitle();
 325                 if ( $title->hasSubjectNamespace( NS_USER ) ) {
 326                         $rootUser = $title->getRootText();
 327                         if ( User::isIP( $rootUser ) ) {
 328                                 $this->mRelevantUser = User::newFromName( $rootUser, false );
 329                         } else {
 330                                 $user = User::newFromName( $rootUser, false );
 331
 332                                 if ( $user ) {
 333                                         $user->load( User::READ_NORMAL );
 334
 335                                         if ( $user->isLoggedIn() ) {
 336                                                 $this->mRelevantUser = $user;
 337                                         }
 338                                 }
 339                         }
 340                         return $this->mRelevantUser;
 341                 }
 342                 return null;
 343         }
 344
 345         /**
 346          * Outputs the HTML generated by other functions.
 347          * @param OutputPage $out
 348          */
 349         abstract function outputPage( OutputPage $out = null );
 350
 351         /**
 352          * @param array $data
 353          * @return string
 354          */
 355         static function makeVariablesScript( $data ) {
 356                 if ( $data ) {
 357                         return ResourceLoader::makeInlineScript(
 358                                 ResourceLoader::makeConfigSetScript( $data )
 359                         );
 360                 } else {
 361                         return '';
 362                 }
 363         }
 364
 365         /**
 366          * Get the query to generate a dynamic stylesheet
 367          *
 368          * @return array
 369          */
 370         public static function getDynamicStylesheetQuery() {
 371                 global $wgSquidMaxage;
 372
 373                 return array(
 374                                 'action' => 'raw',
 375                                 'maxage' => $wgSquidMaxage,
 376                                 'usemsgcache' => 'yes',
 377                                 'ctype' => 'text/css',
 378                                 'smaxage' => $wgSquidMaxage,
 379                         );
 380         }
 381
 382         /**
 383          * Add skin specific stylesheets
 384          * Calling this method with an $out of anything but the same OutputPage
 385          * inside ->getOutput() is deprecated. The $out arg is kept
 386          * for compatibility purposes with skins.
 387          * @param OutputPage $out
 388          * @todo delete
 389          */
 390         abstract function setupSkinUserCss( OutputPage $out );
 391
 392         /**
 393          * TODO: document
 394          * @param Title $title
 395          * @return string
 396          */
 397         function getPageClasses( $title ) {
 398                 $numeric = 'ns-' . $title->getNamespace();
 399
 400                 if ( $title->isSpecialPage() ) {
 401                         $type = 'ns-special';
 402                         // bug 23315: provide a class based on the canonical special page name without subpages
 403                         list( $canonicalName ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 404                         if ( $canonicalName ) {
 405                                 $type .= ' ' . Sanitizer::escapeClass( "mw-special-$canonicalName" );
 406                         } else {
 407                                 $type .= ' mw-invalidspecialpage';
 408                         }
 409                 } elseif ( $title->isTalkPage() ) {
 410                         $type = 'ns-talk';
 411                 } else {
 412                         $type = 'ns-subject';
 413                 }
 414
 415                 $name = Sanitizer::escapeClass( 'page-' . $title->getPrefixedText() );
 416
 417                 return "$numeric $type $name";
 418         }
 419
 420         /**
 421          * Return values for <html> element
 422          * @return array Array of associative name-to-value elements for <html> element
 423          */
 424         public function getHtmlElementAttributes() {
 425                 $lang = $this->getLanguage();
 426                 return array(
 427                         'lang' => $lang->getHtmlCode(),
 428                         'dir' => $lang->getDir(),
 429                         'class' => 'client-nojs',
 430                 );
 431         }
 432
 433         /**
 434          * This will be called by OutputPage::headElement when it is creating the
 435          * "<body>" tag, skins can override it if they have a need to add in any
 436          * body attributes or classes of their own.
 437          * @param OutputPage $out
 438          * @param array $bodyAttrs
 439          */
 440         function addToBodyAttributes( $out, &$bodyAttrs ) {
 441                 // does nothing by default
 442         }
 443
 444         /**
 445          * URL to the logo
 446          * @return string
 447          */
 448         function getLogo() {
 449                 global $wgLogo;
 450                 return $wgLogo;
 451         }
 452
 453         /**
 454          * @return string
 455          */
 456         function getCategoryLinks() {
 457                 global $wgUseCategoryBrowser;
 458
 459                 $out = $this->getOutput();
 460                 $allCats = $out->getCategoryLinks();
 461
 462                 if ( !count( $allCats ) ) {
 463                         return '';
 464                 }
 465
 466                 $embed = "<li>";
 467                 $pop = "</li>";
 468
 469                 $s = '';
 470                 $colon = $this->msg( 'colon-separator' )->escaped();
 471
 472                 if ( !empty( $allCats['normal'] ) ) {
 473                         $t = $embed . implode( "{$pop}{$embed}", $allCats['normal'] ) . $pop;
 474
 475                         $msg = $this->msg( 'pagecategories' )->numParams( count( $allCats['normal'] ) )->escaped();
 476                         $linkPage = wfMessage( 'pagecategorieslink' )->inContentLanguage()->text();
 477                         $title = Title::newFromText( $linkPage );
 478                         $link = $title ? Linker::link( $title, $msg ) : $msg;
 479                         $s .= '<div id="mw-normal-catlinks" class="mw-normal-catlinks">' .
 480                                 $link . $colon . '<ul>' . $t . '</ul>' . '</div>';
 481                 }
 482
 483                 # Hidden categories
 484                 if ( isset( $allCats['hidden'] ) ) {
 485                         if ( $this->getUser()->getBoolOption( 'showhiddencats' ) ) {
 486                                 $class = ' mw-hidden-cats-user-shown';
 487                         } elseif ( $this->getTitle()->getNamespace() == NS_CATEGORY ) {
 488                                 $class = ' mw-hidden-cats-ns-shown';
 489                         } else {
 490                                 $class = ' mw-hidden-cats-hidden';
 491                         }
 492
 493                         $s .= "<div id=\"mw-hidden-catlinks\" class=\"mw-hidden-catlinks$class\">" .
 494                                 $this->msg( 'hidden-categories' )->numParams( count( $allCats['hidden'] ) )->escaped() .
 495                                 $colon . '<ul>' . $embed . implode( "{$pop}{$embed}", $allCats['hidden'] ) . $pop . '</ul>' .
 496                                 '</div>';
 497                 }
 498
 499                 # optional 'dmoz-like' category browser. Will be shown under the list
 500                 # of categories an article belong to
 501                 if ( $wgUseCategoryBrowser ) {
 502                         $s .= '<br /><hr />';
 503
 504                         # get a big array of the parents tree
 505                         $parenttree = $this->getTitle()->getParentCategoryTree();
 506                         # Skin object passed by reference cause it can not be
 507                         # accessed under the method subfunction drawCategoryBrowser
 508                         $tempout = explode( "\n", $this->drawCategoryBrowser( $parenttree ) );
 509                         # Clean out bogus first entry and sort them
 510                         unset( $tempout[0] );
 511                         asort( $tempout );
 512                         # Output one per line
 513                         $s .= implode( "<br />\n", $tempout );
 514                 }
 515
 516                 return $s;
 517         }
 518
 519         /**
 520          * Render the array as a series of links.
 521          * @param array $tree Categories tree returned by Title::getParentCategoryTree
 522          * @return string Separated by &gt;, terminate with "\n"
 523          */
 524         function drawCategoryBrowser( $tree ) {
 525                 $return = '';
 526
 527                 foreach ( $tree as $element => $parent ) {
 528                         if ( empty( $parent ) ) {
 529                                 # element start a new list
 530                                 $return .= "\n";
 531                         } else {
 532                                 # grab the others elements
 533                                 $return .= $this->drawCategoryBrowser( $parent ) . ' &gt; ';
 534                         }
 535
 536                         # add our current element to the list
 537                         $eltitle = Title::newFromText( $element );
 538                         $return .= Linker::link( $eltitle, htmlspecialchars( $eltitle->getText() ) );
 539                 }
 540
 541                 return $return;
 542         }
 543
 544         /**
 545          * @return string
 546          */
 547         function getCategories() {
 548                 $out = $this->getOutput();
 549
 550                 $catlinks = $this->getCategoryLinks();
 551
 552                 $classes = 'catlinks';
 553
 554                 // Check what we're showing
 555                 $allCats = $out->getCategoryLinks();
 556                 $showHidden = $this->getUser()->getBoolOption( 'showhiddencats' ) ||
 557                                                 $this->getTitle()->getNamespace() == NS_CATEGORY;
 558
 559                 if ( empty( $allCats['normal'] ) && !( !empty( $allCats['hidden'] ) && $showHidden ) ) {
 560                         $classes .= ' catlinks-allhidden';
 561                 }
 562
 563                 return "<div id='catlinks' class='$classes'>{$catlinks}</div>";
 564         }
 565
 566         /**
 567          * This runs a hook to allow extensions placing their stuff after content
 568          * and article metadata (e.g. categories).
 569          * Note: This function has nothing to do with afterContent().
 570          *
 571          * This hook is placed here in order to allow using the same hook for all
 572          * skins, both the SkinTemplate based ones and the older ones, which directly
 573          * use this class to get their data.
 574          *
 575          * The output of this function gets processed in SkinTemplate::outputPage() for
 576          * the SkinTemplate based skins, all other skins should directly echo it.
 577          *
 578          * @return string Empty by default, if not changed by any hook function.
 579          */
 580         protected function afterContentHook() {
 581                 $data = '';
 582
 583                 if ( Hooks::run( 'SkinAfterContent', array( &$data, $this ) ) ) {
 584                         // adding just some spaces shouldn't toggle the output
 585                         // of the whole <div/>, so we use trim() here
 586                         if ( trim( $data ) != '' ) {
 587                                 // Doing this here instead of in the skins to
 588                                 // ensure that the div has the same ID in all
 589                                 // skins
 590                                 $data = "<div id='mw-data-after-content'>\n" .
 591                                         "\t$data\n" .
 592                                         "</div>\n";
 593                         }
 594                 } else {
 595                         wfDebug( "Hook SkinAfterContent changed output processing.\n" );
 596                 }
 597
 598                 return $data;
 599         }
 600
 601         /**
 602          * Generate debug data HTML for displaying at the bottom of the main content
 603          * area.
 604          * @return string HTML containing debug data, if enabled (otherwise empty).
 605          */
 606         protected function generateDebugHTML() {
 607                 return MWDebug::getHTMLDebugLog();
 608         }
 609
 610         /**
 611          * This gets called shortly before the "</body>" tag.
 612          *
 613          * @return string HTML-wrapped JS code to be put before "</body>"
 614          */
 615         function bottomScripts() {
 616                 // TODO and the suckage continues. This function is really just a wrapper around
 617                 // OutputPage::getBottomScripts() which takes a Skin param. This should be cleaned
 618                 // up at some point
 619                 $bottomScriptText = $this->getOutput()->getBottomScripts();
 620                 Hooks::run( 'SkinAfterBottomScripts', array( $this, &$bottomScriptText ) );
 621
 622                 return $bottomScriptText;
 623         }
 624
 625         /**
 626          * Text with the permalink to the source page,
 627          * usually shown on the footer of a printed page
 628          *
 629          * @return string HTML text with an URL
 630          */
 631         function printSource() {
 632                 $oldid = $this->getRevisionId();
 633                 if ( $oldid ) {
 634                         $canonicalUrl = $this->getTitle()->getCanonicalURL( 'oldid=' . $oldid );
 635                         $url = htmlspecialchars( wfExpandIRI( $canonicalUrl ) );
 636                 } else {
 637                         // oldid not available for non existing pages
 638                         $url = htmlspecialchars( wfExpandIRI( $this->getTitle()->getCanonicalURL() ) );
 639                 }
 640
 641                 return $this->msg( 'retrievedfrom' )
 642                         ->rawParams( '<a dir="ltr" href="' . $url . '">' . $url . '</a>' )
 643                         ->parse();
 644         }
 645
 646         /**
 647          * @return string HTML
 648          */
 649         function getUndeleteLink() {
 650                 $action = $this->getRequest()->getVal( 'action', 'view' );
 651
 652                 if ( $this->getTitle()->userCan( 'deletedhistory', $this->getUser() ) &&
 653                         ( !$this->getTitle()->exists() || $action == 'history' ) ) {
 654                         $n = $this->getTitle()->isDeleted();
 655
 656                         if ( $n ) {
 657                                 if ( $this->getTitle()->quickUserCan( 'undelete', $this->getUser() ) ) {
 658                                         $msg = 'thisisdeleted';
 659                                 } else {
 660                                         $msg = 'viewdeleted';
 661                                 }
 662
 663                                 return $this->msg( $msg )->rawParams(
 664                                         Linker::linkKnown(
 665                                                 SpecialPage::getTitleFor( 'Undelete', $this->getTitle()->getPrefixedDBkey() ),
 666                                                 $this->msg( 'restorelink' )->numParams( $n )->escaped() )
 667                                         )->escaped();
 668                         }
 669                 }
 670
 671                 return '';
 672         }
 673
 674         /**
 675          * @return string
 676          */
 677         function subPageSubtitle() {
 678                 $out = $this->getOutput();
 679                 $subpages = '';
 680
 681                 if ( !Hooks::run( 'SkinSubPageSubtitle', array( &$subpages, $this, $out ) ) ) {
 682                         return $subpages;
 683                 }
 684
 685                 if ( $out->isArticle() && MWNamespace::hasSubpages( $out->getTitle()->getNamespace() ) ) {
 686                         $ptext = $this->getTitle()->getPrefixedText();
 687                         if ( preg_match( '/\//', $ptext ) ) {
 688                                 $links = explode( '/', $ptext );
 689                                 array_pop( $links );
 690                                 $c = 0;
 691                                 $growinglink = '';
 692                                 $display = '';
 693                                 $lang = $this->getLanguage();
 694
 695                                 foreach ( $links as $link ) {
 696                                         $growinglink .= $link;
 697                                         $display .= $link;
 698                                         $linkObj = Title::newFromText( $growinglink );
 699
 700                                         if ( is_object( $linkObj ) && $linkObj->isKnown() ) {
 701                                                 $getlink = Linker::linkKnown(
 702                                                         $linkObj,
 703                                                         htmlspecialchars( $display )
 704                                                 );
 705
 706                                                 $c++;
 707
 708                                                 if ( $c > 1 ) {
 709                                                         $subpages .= $lang->getDirMarkEntity() . $this->msg( 'pipe-separator' )->escaped();
 710                                                 } else {
 711                                                         $subpages .= '&lt; ';
 712                                                 }
 713
 714                                                 $subpages .= $getlink;
 715                                                 $display = '';
 716                                         } else {
 717                                                 $display .= '/';
 718                                         }
 719                                         $growinglink .= '/';
 720                                 }
 721                         }
 722                 }
 723
 724                 return $subpages;
 725         }
 726
 727         /**
 728          * @deprecated since 1.27, feature removed
 729          * @return bool Always false
 730          */
 731         function showIPinHeader() {
 732                 wfDeprecated( __METHOD__, '1.27' );
 733                 return false;
 734         }
 735
 736         /**
 737          * @return string
 738          */
 739         function getSearchLink() {
 740                 $searchPage = SpecialPage::getTitleFor( 'Search' );
 741                 return $searchPage->getLocalURL();
 742         }
 743
 744         /**
 745          * @return string
 746          */
 747         function escapeSearchLink() {
 748                 return htmlspecialchars( $this->getSearchLink() );
 749         }
 750
 751         /**
 752          * @param string $type
 753          * @return string
 754          */
 755         function getCopyright( $type = 'detect' ) {
 756                 global $wgRightsPage, $wgRightsUrl, $wgRightsText;
 757
 758                 if ( $type == 'detect' ) {
 759                         if ( !$this->isRevisionCurrent()
 760                                 && !$this->msg( 'history_copyright' )->inContentLanguage()->isDisabled()
 761                         ) {
 762                                 $type = 'history';
 763                         } else {
 764                                 $type = 'normal';
 765                         }
 766                 }
 767
 768                 if ( $type == 'history' ) {
 769                         $msg = 'history_copyright';
 770                 } else {
 771                         $msg = 'copyright';
 772                 }
 773
 774                 if ( $wgRightsPage ) {
 775                         $title = Title::newFromText( $wgRightsPage );
 776                         $link = Linker::linkKnown( $title, $wgRightsText );
 777                 } elseif ( $wgRightsUrl ) {
 778                         $link = Linker::makeExternalLink( $wgRightsUrl, $wgRightsText );
 779                 } elseif ( $wgRightsText ) {
 780                         $link = $wgRightsText;
 781                 } else {
 782                         # Give up now
 783                         return '';
 784                 }
 785
 786                 // Allow for site and per-namespace customization of copyright notice.
 787                 // @todo Remove deprecated $forContent param from hook handlers and then remove here.
 788                 $forContent = true;
 789
 790                 Hooks::run(
 791                         'SkinCopyrightFooter',
 792                         array( $this->getTitle(), $type, &$msg, &$link, &$forContent )
 793                 );
 794
 795                 return $this->msg( $msg )->rawParams( $link )->text();
 796         }
 797
 798         /**
 799          * @return null|string
 800          */
 801         function getCopyrightIcon() {
 802                 global $wgRightsUrl, $wgRightsText, $wgRightsIcon, $wgCopyrightIcon;
 803
 804                 $out = '';
 805
 806                 if ( $wgCopyrightIcon ) {
 807                         $out = $wgCopyrightIcon;
 808                 } elseif ( $wgRightsIcon ) {
 809                         $icon = htmlspecialchars( $wgRightsIcon );
 810
 811                         if ( $wgRightsUrl ) {
 812                                 $url = htmlspecialchars( $wgRightsUrl );
 813                                 $out .= '<a href="' . $url . '">';
 814                         }
 815
 816                         $text = htmlspecialchars( $wgRightsText );
 817                         $out .= "<img src=\"$icon\" alt=\"$text\" width=\"88\" height=\"31\" />";
 818
 819                         if ( $wgRightsUrl ) {
 820                                 $out .= '</a>';
 821                         }
 822                 }
 823
 824                 return $out;
 825         }
 826
 827         /**
 828          * Gets the powered by MediaWiki icon.
 829          * @return string
 830          */
 831         function getPoweredBy() {
 832                 global $wgResourceBasePath;
 833
 834                 $url1 = htmlspecialchars(
 835                         "$wgResourceBasePath/resources/assets/poweredby_mediawiki_88x31.png"
 836                 );
 837                 $url1_5 = htmlspecialchars(
 838                         "$wgResourceBasePath/resources/assets/poweredby_mediawiki_132x47.png"
 839                 );
 840                 $url2 = htmlspecialchars(
 841                         "$wgResourceBasePath/resources/assets/poweredby_mediawiki_176x62.png"
 842                 );
 843                 $text = '<a href="//www.mediawiki.org/"><img src="' . $url1
 844                         . '" srcset="' . $url1_5 . ' 1.5x, ' . $url2 . ' 2x" '
 845                         . 'height="31" width="88" alt="Powered by MediaWiki" /></a>';
 846                 Hooks::run( 'SkinGetPoweredBy', array( &$text, $this ) );
 847                 return $text;
 848         }
 849
 850         /**
 851          * Get the timestamp of the latest revision, formatted in user language
 852          *
 853          * @return string
 854          */
 855         protected function lastModified() {
 856                 $timestamp = $this->getOutput()->getRevisionTimestamp();
 857
 858                 # No cached timestamp, load it from the database
 859                 if ( $timestamp === null ) {
 860                         $timestamp = Revision::getTimestampFromId( $this->getTitle(), $this->getRevisionId() );
 861                 }
 862
 863                 if ( $timestamp ) {
 864                         $d = $this->getLanguage()->userDate( $timestamp, $this->getUser() );
 865                         $t = $this->getLanguage()->userTime( $timestamp, $this->getUser() );
 866                         $s = ' ' . $this->msg( 'lastmodifiedat', $d, $t )->parse();
 867                 } else {
 868                         $s = '';
 869                 }
 870
 871                 if ( wfGetLB()->getLaggedSlaveMode() ) {
 872                         $s .= ' <strong>' . $this->msg( 'laggedslavemode' )->parse() . '</strong>';
 873                 }
 874
 875                 return $s;
 876         }
 877
 878         /**
 879          * @param string $align
 880          * @return string
 881          */
 882         function logoText( $align = '' ) {
 883                 if ( $align != '' ) {
 884                         $a = " style='float: {$align};'";
 885                 } else {
 886                         $a = '';
 887                 }
 888
 889                 $mp = $this->msg( 'mainpage' )->escaped();
 890                 $mptitle = Title::newMainPage();
 891                 $url = ( is_object( $mptitle ) ? htmlspecialchars( $mptitle->getLocalURL() ) : '' );
 892
 893                 $logourl = $this->getLogo();
 894                 $s = "<a href='{$url}'><img{$a} src='{$logourl}' alt='[{$mp}]' /></a>";
 895
 896                 return $s;
 897         }
 898
 899         /**
 900          * Renders a $wgFooterIcons icon according to the method's arguments
 901          * @param array $icon The icon to build the html for, see $wgFooterIcons
 902          *   for the format of this array.
 903          * @param bool|string $withImage Whether to use the icon's image or output
 904          *   a text-only footericon.
 905          * @return string HTML
 906          */
 907         function makeFooterIcon( $icon, $withImage = 'withImage' ) {
 908                 if ( is_string( $icon ) ) {
 909                         $html = $icon;
 910                 } else { // Assuming array
 911                         $url = isset( $icon["url"] ) ? $icon["url"] : null;
 912                         unset( $icon["url"] );
 913                         if ( isset( $icon["src"] ) && $withImage === 'withImage' ) {
 914                                 // do this the lazy way, just pass icon data as an attribute array
 915                                 $html = Html::element( 'img', $icon );
 916                         } else {
 917                                 $html = htmlspecialchars( $icon["alt"] );
 918                         }
 919                         if ( $url ) {
 920                                 $html = Html::rawElement( 'a', array( "href" => $url ), $html );
 921                         }
 922                 }
 923                 return $html;
 924         }
 925
 926         /**
 927          * Gets the link to the wiki's main page.
 928          * @return string
 929          */
 930         function mainPageLink() {
 931                 $s = Linker::linkKnown(
 932                         Title::newMainPage(),
 933                         $this->msg( 'mainpage' )->escaped()
 934                 );
 935
 936                 return $s;
 937         }
 938
 939         /**
 940          * Returns an HTML link for use in the footer
 941          * @param string $desc The i18n message key for the link text
 942          * @param string $page The i18n message key for the page to link to
 943          * @return string HTML anchor
 944          */
 945         public function footerLink( $desc, $page ) {
 946                 // if the link description has been set to "-" in the default language,
 947                 if ( $this->msg( $desc )->inContentLanguage()->isDisabled() ) {
 948                         // then it is disabled, for all languages.
 949                         return '';
 950                 } else {
 951                         // Otherwise, we display the link for the user, described in their
 952                         // language (which may or may not be the same as the default language),
 953                         // but we make the link target be the one site-wide page.
 954                         $title = Title::newFromText( $this->msg( $page )->inContentLanguage()->text() );
 955
 956                         if ( !$title ) {
 957                                 return '';
 958                         }
 959
 960                         return Linker::linkKnown(
 961                                 $title,
 962                                 $this->msg( $desc )->escaped()
 963                         );
 964                 }
 965         }
 966
 967         /**
 968          * Gets the link to the wiki's privacy policy page.
 969          * @return string HTML
 970          */
 971         function privacyLink() {
 972                 return $this->footerLink( 'privacy', 'privacypage' );
 973         }
 974
 975         /**
 976          * Gets the link to the wiki's about page.
 977          * @return string HTML
 978          */
 979         function aboutLink() {
 980                 return $this->footerLink( 'aboutsite', 'aboutpage' );
 981         }
 982
 983         /**
 984          * Gets the link to the wiki's general disclaimers page.
 985          * @return string HTML
 986          */
 987         function disclaimerLink() {
 988                 return $this->footerLink( 'disclaimers', 'disclaimerpage' );
 989         }
 990
 991         /**
 992          * Return URL options for the 'edit page' link.
 993          * This may include an 'oldid' specifier, if the current page view is such.
 994          *
 995          * @return array
 996          * @private
 997          */
 998         function editUrlOptions() {
 999                 $options = array( 'action' => 'edit' );
1000
1001                 if ( !$this->isRevisionCurrent() ) {
1002                         $options['oldid'] = intval( $this->getRevisionId() );
1003                 }
1004
1005                 return $options;
1006         }
1007
1008         /**
1009          * @param User|int $id
1010          * @return bool
1011          */
1012         function showEmailUser( $id ) {
1013                 if ( $id instanceof User ) {
1014                         $targetUser = $id;
1015                 } else {
1016                         $targetUser = User::newFromId( $id );
1017                 }
1018
1019                 # The sending user must have a confirmed email address and the target
1020                 # user must have a confirmed email address and allow emails from users.
1021                 return $this->getUser()->canSendEmail() &&
1022                         $targetUser->canReceiveEmail();
1023         }
1024
1025         /**
1026          * This function previously returned a fully resolved style path URL to images or styles stored in
1027          * the legacy skins/common/ directory.
1028          *
1029          * That directory has been removed in 1.24 and the function always returns an empty string.
1030          *
1031          * @deprecated since 1.24
1032          * @param string $name The name or path of a skin resource file
1033          * @return string Empty string
1034          */
1035         function getCommonStylePath( $name ) {
1036                 wfDeprecated( __METHOD__, '1.24' );
1037                 return '';
1038         }
1039
1040         /**
1041          * Return a fully resolved style path url to images or styles stored in the current skins's folder.
1042          * This method returns a url resolved using the configured skin style path
1043          * and includes the style version inside of the url.
1044          *
1045          * Requires $stylename to be set, otherwise throws MWException.
1046          *
1047          * @param string $name The name or path of a skin resource file
1048          * @return string The fully resolved style path url including styleversion
1049          * @throws MWException
1050          */
1051         function getSkinStylePath( $name ) {
1052                 global $wgStylePath, $wgStyleVersion;
1053
1054                 if ( $this->stylename === null ) {
1055                         $class = get_class( $this );
1056                         throw new MWException( "$class::\$stylename must be set to use getSkinStylePath()" );
1057                 }
1058
1059                 return "$wgStylePath/{$this->stylename}/$name?$wgStyleVersion";
1060         }
1061
1062         /* these are used extensively in SkinTemplate, but also some other places */
1063
1064         /**
1065          * @param string $urlaction
1066          * @return string
1067          */
1068         static function makeMainPageUrl( $urlaction = '' ) {
1069                 $title = Title::newMainPage();
1070                 self::checkTitle( $title, '' );
1071
1072                 return $title->getLocalURL( $urlaction );
1073         }
1074
1075         /**
1076          * Make a URL for a Special Page using the given query and protocol.
1077          *
1078          * If $proto is set to null, make a local URL. Otherwise, make a full
1079          * URL with the protocol specified.
1080          *
1081          * @param string $name Name of the Special page
1082          * @param string $urlaction Query to append
1083          * @param string|null $proto Protocol to use or null for a local URL
1084          * @return string
1085          */
1086         static function makeSpecialUrl( $name, $urlaction = '', $proto = null ) {
1087                 $title = SpecialPage::getSafeTitleFor( $name );
1088                 if ( is_null( $proto ) ) {
1089                         return $title->getLocalURL( $urlaction );
1090                 } else {
1091                         return $title->getFullURL( $urlaction, false, $proto );
1092                 }
1093         }
1094
1095         /**
1096          * @param string $name
1097          * @param string $subpage
1098          * @param string $urlaction
1099          * @return string
1100          */
1101         static function makeSpecialUrlSubpage( $name, $subpage, $urlaction = '' ) {
1102                 $title = SpecialPage::getSafeTitleFor( $name, $subpage );
1103                 return $title->getLocalURL( $urlaction );
1104         }
1105
1106         /**
1107          * @param string $name
1108          * @param string $urlaction
1109          * @return string
1110          */
1111         static function makeI18nUrl( $name, $urlaction = '' ) {
1112                 $title = Title::newFromText( wfMessage( $name )->inContentLanguage()->text() );
1113                 self::checkTitle( $title, $name );
1114                 return $title->getLocalURL( $urlaction );
1115         }
1116
1117         /**
1118          * @param string $name
1119          * @param string $urlaction
1120          * @return string
1121          */
1122         static function makeUrl( $name, $urlaction = '' ) {
1123                 $title = Title::newFromText( $name );
1124                 self::checkTitle( $title, $name );
1125
1126                 return $title->getLocalURL( $urlaction );
1127         }
1128
1129         /**
1130          * If url string starts with http, consider as external URL, else
1131          * internal
1132          * @param string $name
1133          * @return string URL
1134          */
1135         static function makeInternalOrExternalUrl( $name ) {
1136                 if ( preg_match( '/^(?i:' . wfUrlProtocols() . ')/', $name ) ) {
1137                         return $name;
1138                 } else {
1139                         return self::makeUrl( $name );
1140                 }
1141         }
1142
1143         /**
1144          * this can be passed the NS number as defined in Language.php
1145          * @param string $name
1146          * @param string $urlaction
1147          * @param int $namespace
1148          * @return string
1149          */
1150         static function makeNSUrl( $name, $urlaction = '', $namespace = NS_MAIN ) {
1151                 $title = Title::makeTitleSafe( $namespace, $name );
1152                 self::checkTitle( $title, $name );
1153
1154                 return $title->getLocalURL( $urlaction );
1155         }
1156
1157         /**
1158          * these return an array with the 'href' and boolean 'exists'
1159          * @param string $name
1160          * @param string $urlaction
1161          * @return array
1162          */
1163         static function makeUrlDetails( $name, $urlaction = '' ) {
1164                 $title = Title::newFromText( $name );
1165                 self::checkTitle( $title, $name );
1166
1167                 return array(
1168                         'href' => $title->getLocalURL( $urlaction ),
1169                         'exists' => $title->isKnown(),
1170                 );
1171         }
1172
1173         /**
1174          * Make URL details where the article exists (or at least it's convenient to think so)
1175          * @param string $name Article name
1176          * @param string $urlaction
1177          * @return array
1178          */
1179         static function makeKnownUrlDetails( $name, $urlaction = '' ) {
1180                 $title = Title::newFromText( $name );
1181                 self::checkTitle( $title, $name );
1182
1183                 return array(
1184                         'href' => $title->getLocalURL( $urlaction ),
1185                         'exists' => true
1186                 );
1187         }
1188
1189         /**
1190          * make sure we have some title to operate on
1191          *
1192          * @param Title $title
1193          * @param string $name
1194          */
1195         static function checkTitle( &$title, $name ) {
1196                 if ( !is_object( $title ) ) {
1197                         $title = Title::newFromText( $name );
1198                         if ( !is_object( $title ) ) {
1199                                 $title = Title::newFromText( '--error: link target missing--' );
1200                         }
1201                 }
1202         }
1203
1204         /**
1205          * Build an array that represents the sidebar(s), the navigation bar among them.
1206          *
1207          * BaseTemplate::getSidebar can be used to simplify the format and id generation in new skins.
1208          *
1209          * The format of the returned array is array( heading => content, ... ), where:
1210          * - heading is the heading of a navigation portlet. It is either:
1211          *   - magic string to be handled by the skins ('SEARCH' / 'LANGUAGES' / 'TOOLBOX' / ...)
1212          *   - a message name (e.g. 'navigation'), the message should be HTML-escaped by the skin
1213          *   - plain text, which should be HTML-escaped by the skin
1214          * - content is the contents of the portlet. It is either:
1215          *   - HTML text (<ul><li>...</li>...</ul>)
1216          *   - array of link data in a format accepted by BaseTemplate::makeListItem()
1217          *   - (for a magic string as a key, any value)
1218          *
1219          * Note that extensions can control the sidebar contents using the SkinBuildSidebar hook
1220          * and can technically insert anything in here; skin creators are expected to handle
1221          * values described above.
1222          *
1223          * @return array
1224          */
1225         function buildSidebar() {
1226                 global $wgEnableSidebarCache, $wgSidebarCacheExpiry;
1227
1228                 $that = $this;
1229                 $callback = function () use ( $that ) {
1230                         $bar = array();
1231                         $that->addToSidebar( $bar, 'sidebar' );
1232                         Hooks::run( 'SkinBuildSidebar', array( $that, &$bar ) );
1233
1234                         return $bar;
1235                 };
1236
1237                 if ( $wgEnableSidebarCache ) {
1238                         $cache = ObjectCache::getMainWANInstance();
1239                         $sidebar = $cache->getWithSetCallback(
1240                                 $cache->makeKey( 'sidebar', $this->getLanguage()->getCode() ),
1241                                 $wgSidebarCacheExpiry,
1242                                 $callback,
1243                                 array( 'lockTSE' => 30 )
1244                         );
1245                 } else {
1246                         $sidebar = $callback();
1247                 }
1248
1249                 // Apply post-processing to the cached value
1250                 Hooks::run( 'SidebarBeforeOutput', array( $this, &$sidebar ) );
1251
1252                 return $sidebar;
1253         }
1254
1255         /**
1256          * Add content from a sidebar system message
1257          * Currently only used for MediaWiki:Sidebar (but may be used by Extensions)
1258          *
1259          * This is just a wrapper around addToSidebarPlain() for backwards compatibility
1260          *
1261          * @param array $bar
1262          * @param string $message
1263          */
1264         public function addToSidebar( &$bar, $message ) {
1265                 $this->addToSidebarPlain( $bar, wfMessage( $message )->inContentLanguage()->plain() );
1266         }
1267
1268         /**
1269          * Add content from plain text
1270          * @since 1.17
1271          * @param array $bar
1272          * @param string $text
1273          * @return array
1274          */
1275         function addToSidebarPlain( &$bar, $text ) {
1276                 $lines = explode( "\n", $text );
1277
1278                 $heading = '';
1279
1280                 foreach ( $lines as $line ) {
1281                         if ( strpos( $line, '*' ) !== 0 ) {
1282                                 continue;
1283                         }
1284                         $line = rtrim( $line, "\r" ); // for Windows compat
1285
1286                         if ( strpos( $line, '**' ) !== 0 ) {
1287                                 $heading = trim( $line, '* ' );
1288                                 if ( !array_key_exists( $heading, $bar ) ) {
1289                                         $bar[$heading] = array();
1290                                 }
1291                         } else {
1292                                 $line = trim( $line, '* ' );
1293
1294                                 if ( strpos( $line, '|' ) !== false ) { // sanity check
1295                                         $line = MessageCache::singleton()->transform( $line, false, null, $this->getTitle() );
1296                                         $line = array_map( 'trim', explode( '|', $line, 2 ) );
1297                                         if ( count( $line ) !== 2 ) {
1298                                                 // Second sanity check, could be hit by people doing
1299                                                 // funky stuff with parserfuncs... (bug 33321)
1300                                                 continue;
1301                                         }
1302
1303                                         $extraAttribs = array();
1304
1305                                         $msgLink = $this->msg( $line[0] )->inContentLanguage();
1306                                         if ( $msgLink->exists() ) {
1307                                                 $link = $msgLink->text();
1308                                                 if ( $link == '-' ) {
1309                                                         continue;
1310                                                 }
1311                                         } else {
1312                                                 $link = $line[0];
1313                                         }
1314                                         $msgText = $this->msg( $line[1] );
1315                                         if ( $msgText->exists() ) {
1316                                                 $text = $msgText->text();
1317                                         } else {
1318                                                 $text = $line[1];
1319                                         }
1320
1321                                         if ( preg_match( '/^(?i:' . wfUrlProtocols() . ')/', $link ) ) {
1322                                                 $href = $link;
1323
1324                                                 // Parser::getExternalLinkAttribs won't work here because of the Namespace things
1325                                                 global $wgNoFollowLinks, $wgNoFollowDomainExceptions;
1326                                                 if ( $wgNoFollowLinks && !wfMatchesDomainList( $href, $wgNoFollowDomainExceptions ) ) {
1327                                                         $extraAttribs['rel'] = 'nofollow';
1328                                                 }
1329
1330                                                 global $wgExternalLinkTarget;
1331                                                 if ( $wgExternalLinkTarget ) {
1332                                                         $extraAttribs['target'] = $wgExternalLinkTarget;
1333                                                 }
1334                                         } else {
1335                                                 $title = Title::newFromText( $link );
1336
1337                                                 if ( $title ) {
1338                                                         $title = $title->fixSpecialName();
1339                                                         $href = $title->getLinkURL();
1340                                                 } else {
1341                                                         $href = 'INVALID-TITLE';
1342                                                 }
1343                                         }
1344
1345                                         $bar[$heading][] = array_merge( array(
1346                                                 'text' => $text,
1347                                                 'href' => $href,
1348                                                 'id' => 'n-' . Sanitizer::escapeId( strtr( $line[1], ' ', '-' ), 'noninitial' ),
1349                                                 'active' => false
1350                                         ), $extraAttribs );
1351                                 } else {
1352                                         continue;
1353                                 }
1354                         }
1355                 }
1356
1357                 return $bar;
1358         }
1359
1360         /**
1361          * This function previously controlled whether the 'mediawiki.legacy.wikiprintable' module
1362          * should be loaded by OutputPage. That module no longer exists and the return value of this
1363          * method is ignored.
1364          *
1365          * If your skin doesn't provide its own print styles, the 'mediawiki.legacy.commonPrint' module
1366          * can be used instead (SkinTemplate-based skins do it automatically).
1367          *
1368          * @deprecated since 1.22
1369          * @return bool
1370          */
1371         public function commonPrintStylesheet() {
1372                 wfDeprecated( __METHOD__, '1.22' );
1373                 return false;
1374         }
1375
1376         /**
1377          * Gets new talk page messages for the current user and returns an
1378          * appropriate alert message (or an empty string if there are no messages)
1379          * @return string
1380          */
1381         function getNewtalks() {
1382
1383                 $newMessagesAlert = '';
1384                 $user = $this->getUser();
1385                 $newtalks = $user->getNewMessageLinks();
1386                 $out = $this->getOutput();
1387
1388                 // Allow extensions to disable or modify the new messages alert
1389                 if ( !Hooks::run( 'GetNewMessagesAlert', array( &$newMessagesAlert, $newtalks, $user, $out ) ) ) {
1390                         return '';
1391                 }
1392                 if ( $newMessagesAlert ) {
1393                         return $newMessagesAlert;
1394                 }
1395
1396                 if ( count( $newtalks ) == 1 && $newtalks[0]['wiki'] === wfWikiID() ) {
1397                         $uTalkTitle = $user->getTalkPage();
1398                         $lastSeenRev = isset( $newtalks[0]['rev'] ) ? $newtalks[0]['rev'] : null;
1399                         $nofAuthors = 0;
1400                         if ( $lastSeenRev !== null ) {
1401                                 $plural = true; // Default if we have a last seen revision: if unknown, use plural
1402                                 $latestRev = Revision::newFromTitle( $uTalkTitle, false, Revision::READ_NORMAL );
1403                                 if ( $latestRev !== null ) {
1404                                         // Singular if only 1 unseen revision, plural if several unseen revisions.
1405                                         $plural = $latestRev->getParentId() !== $lastSeenRev->getId();
1406                                         $nofAuthors = $uTalkTitle->countAuthorsBetween(
1407                                                 $lastSeenRev, $latestRev, 10, 'include_new' );
1408                                 }
1409                         } else {
1410                                 // Singular if no revision -> diff link will show latest change only in any case
1411                                 $plural = false;
1412                         }
1413                         $plural = $plural ? 999 : 1;
1414                         // 999 signifies "more than one revision". We don't know how many, and even if we did,
1415                         // the number of revisions or authors is not necessarily the same as the number of
1416                         // "messages".
1417                         $newMessagesLink = Linker::linkKnown(
1418                                 $uTalkTitle,
1419                                 $this->msg( 'newmessageslinkplural' )->params( $plural )->escaped(),
1420                                 array(),
1421                                 array( 'redirect' => 'no' )
1422                         );
1423
1424                         $newMessagesDiffLink = Linker::linkKnown(
1425                                 $uTalkTitle,
1426                                 $this->msg( 'newmessagesdifflinkplural' )->params( $plural )->escaped(),
1427                                 array(),
1428                                 $lastSeenRev !== null
1429                                         ? array( 'oldid' => $lastSeenRev->getId(), 'diff' => 'cur' )
1430                                         : array( 'diff' => 'cur' )
1431                         );
1432
1433                         if ( $nofAuthors >= 1 && $nofAuthors <= 10 ) {
1434                                 $newMessagesAlert = $this->msg(
1435                                         'youhavenewmessagesfromusers',
1436                                         $newMessagesLink,
1437                                         $newMessagesDiffLink
1438                                 )->numParams( $nofAuthors, $plural );
1439                         } else {
1440                                 // $nofAuthors === 11 signifies "11 or more" ("more than 10")
1441                                 $newMessagesAlert = $this->msg(
1442                                         $nofAuthors > 10 ? 'youhavenewmessagesmanyusers' : 'youhavenewmessages',
1443                                         $newMessagesLink,
1444                                         $newMessagesDiffLink
1445                                 )->numParams( $plural );
1446                         }
1447                         $newMessagesAlert = $newMessagesAlert->text();
1448                         # Disable Squid cache
1449                         $out->setSquidMaxage( 0 );
1450                 } elseif ( count( $newtalks ) ) {
1451                         $sep = $this->msg( 'newtalkseparator' )->escaped();
1452                         $msgs = array();
1453
1454                         foreach ( $newtalks as $newtalk ) {
1455                                 $msgs[] = Xml::element(
1456                                         'a',
1457                                         array( 'href' => $newtalk['link'] ), $newtalk['wiki']
1458                                 );
1459                         }
1460                         $parts = implode( $sep, $msgs );
1461                         $newMessagesAlert = $this->msg( 'youhavenewmessagesmulti' )->rawParams( $parts )->escaped();
1462                         $out->setSquidMaxage( 0 );
1463                 }
1464
1465                 return $newMessagesAlert;
1466         }
1467
1468         /**
1469          * Get a cached notice
1470          *
1471          * @param string $name Message name, or 'default' for $wgSiteNotice
1472          * @return string|bool HTML fragment, or false to indicate that the caller
1473          *   should fall back to the next notice in its sequence
1474          */
1475         private function getCachedNotice( $name ) {
1476                 global $wgRenderHashAppend, $parserMemc, $wgContLang;
1477
1478                 $needParse = false;
1479
1480                 if ( $name === 'default' ) {
1481                         // special case
1482                         global $wgSiteNotice;
1483                         $notice = $wgSiteNotice;
1484                         if ( empty( $notice ) ) {
1485                                 return false;
1486                         }
1487                 } else {
1488                         $msg = $this->msg( $name )->inContentLanguage();
1489                         if ( $msg->isBlank() ) {
1490                                 return '';
1491                         } elseif ( $msg->isDisabled() ) {
1492                                 return false;
1493                         }
1494                         $notice = $msg->plain();
1495                 }
1496
1497                 // Use the extra hash appender to let eg SSL variants separately cache.
1498                 $key = wfMemcKey( $name . $wgRenderHashAppend );
1499                 $cachedNotice = $parserMemc->get( $key );
1500                 if ( is_array( $cachedNotice ) ) {
1501                         if ( md5( $notice ) == $cachedNotice['hash'] ) {
1502                                 $notice = $cachedNotice['html'];
1503                         } else {
1504                                 $needParse = true;
1505                         }
1506                 } else {
1507                         $needParse = true;
1508                 }
1509
1510                 if ( $needParse ) {
1511                         $parsed = $this->getOutput()->parse( $notice );
1512                         $parserMemc->set( $key, array( 'html' => $parsed, 'hash' => md5( $notice ) ), 600 );
1513                         $notice = $parsed;
1514                 }
1515
1516                 $notice = Html::rawElement( 'div', array( 'id' => 'localNotice',
1517                         'lang' => $wgContLang->getHtmlCode(), 'dir' => $wgContLang->getDir() ), $notice );
1518                 return $notice;
1519         }
1520
1521         /**
1522          * Get a notice based on page's namespace
1523          *
1524          * @return string HTML fragment
1525          */
1526         function getNamespaceNotice() {
1527
1528                 $key = 'namespacenotice-' . $this->getTitle()->getNsText();
1529                 $namespaceNotice = $this->getCachedNotice( $key );
1530                 if ( $namespaceNotice && substr( $namespaceNotice, 0, 7 ) != '<p>&lt;' ) {
1531                         $namespaceNotice = '<div id="namespacebanner">' . $namespaceNotice . '</div>';
1532                 } else {
1533                         $namespaceNotice = '';
1534                 }
1535
1536                 return $namespaceNotice;
1537         }
1538
1539         /**
1540          * Get the site notice
1541          *
1542          * @return string HTML fragment
1543          */
1544         function getSiteNotice() {
1545                 $siteNotice = '';
1546
1547                 if ( Hooks::run( 'SiteNoticeBefore', array( &$siteNotice, $this ) ) ) {
1548                         if ( is_object( $this->getUser() ) && $this->getUser()->isLoggedIn() ) {
1549                                 $siteNotice = $this->getCachedNotice( 'sitenotice' );
1550                         } else {
1551                                 $anonNotice = $this->getCachedNotice( 'anonnotice' );
1552                                 if ( $anonNotice === false ) {
1553                                         $siteNotice = $this->getCachedNotice( 'sitenotice' );
1554                                 } else {
1555                                         $siteNotice = $anonNotice;
1556                                 }
1557                         }
1558                         if ( $siteNotice === false ) {
1559                                 $siteNotice = $this->getCachedNotice( 'default' );
1560                         }
1561                 }
1562
1563                 Hooks::run( 'SiteNoticeAfter', array( &$siteNotice, $this ) );
1564                 return $siteNotice;
1565         }
1566
1567         /**
1568          * Create a section edit link.  This supersedes editSectionLink() and
1569          * editSectionLinkForOther().
1570          *
1571          * @param Title $nt The title being linked to (may not be the same as
1572          *   the current page, if the section is included from a template)
1573          * @param string $section The designation of the section being pointed to,
1574          *   to be included in the link, like "&section=$section"
1575          * @param string $tooltip The tooltip to use for the link: will be escaped
1576          *   and wrapped in the 'editsectionhint' message
1577          * @param string $lang Language code
1578          * @return string HTML to use for edit link
1579          */
1580         public function doEditSectionLink( Title $nt, $section, $tooltip = null, $lang = false ) {
1581                 // HTML generated here should probably have userlangattributes
1582                 // added to it for LTR text on RTL pages
1583
1584                 $lang = wfGetLangObj( $lang );
1585
1586                 $attribs = array();
1587                 if ( !is_null( $tooltip ) ) {
1588                         # Bug 25462: undo double-escaping.
1589                         $tooltip = Sanitizer::decodeCharReferences( $tooltip );
1590                         $attribs['title'] = wfMessage( 'editsectionhint' )->rawParams( $tooltip )
1591                                 ->inLanguage( $lang )->text();
1592                 }
1593
1594                 $links = array(
1595                         'editsection' => array(
1596                                 'text' => wfMessage( 'editsection' )->inLanguage( $lang )->escaped(),
1597                                 'targetTitle' => $nt,
1598                                 'attribs' => $attribs,
1599                                 'query' => array( 'action' => 'edit', 'section' => $section ),
1600                                 'options' => array( 'noclasses', 'known' )
1601                         )
1602                 );
1603
1604                 Hooks::run( 'SkinEditSectionLinks', array( $this, $nt, $section, $tooltip, &$links, $lang ) );
1605
1606                 $result = '<span class="mw-editsection"><span class="mw-editsection-bracket">[</span>';
1607
1608                 $linksHtml = array();
1609                 foreach ( $links as $k => $linkDetails ) {
1610                         $linksHtml[] = Linker::link(
1611                                 $linkDetails['targetTitle'],
1612                                 $linkDetails['text'],
1613                                 $linkDetails['attribs'],
1614                                 $linkDetails['query'],
1615                                 $linkDetails['options']
1616                         );
1617                 }
1618
1619                 $result .= implode(
1620                         '<span class="mw-editsection-divider">'
1621                                 . wfMessage( 'pipe-separator' )->inLanguage( $lang )->text()
1622                                 . '</span>',
1623                         $linksHtml
1624                 );
1625
1626                 $result .= '<span class="mw-editsection-bracket">]</span></span>';
1627                 // Deprecated, use SkinEditSectionLinks hook instead
1628                 Hooks::run(
1629                         'DoEditSectionLink',
1630                         array( $this, $nt, $section, $tooltip, &$result, $lang ),
1631                         '1.25'
1632                 );
1633                 return $result;
1634         }
1635
1636         /**
1637          * Use PHP's magic __call handler to intercept legacy calls to the linker
1638          * for backwards compatibility.
1639          *
1640          * @param string $fname Name of called method
1641          * @param array $args Arguments to the method
1642          * @throws MWException
1643          * @return mixed
1644          */
1645         function __call( $fname, $args ) {
1646                 $realFunction = array( 'Linker', $fname );
1647                 if ( is_callable( $realFunction ) ) {
1648                         wfDeprecated( get_class( $this ) . '::' . $fname, '1.21' );
1649                         return call_user_func_array( $realFunction, $args );
1650                 } else {
1651                         $className = get_class( $this );
1652                         throw new MWException( "Call to undefined method $className::$fname" );
1653                 }
1654         }
1655
1656 }