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 Use SkinFactory instead
 148          */
 149         static function &newFromKey( $key ) {
 150                 wfDeprecated( __METHOD__, '1.24' );
 151                 global $wgFallbackSkin;
 152
 153                 $key = Skin::normalizeKey( $key );
 154                 $factory = SkinFactory::getDefaultInstance();
 155                 try {
 156                         $skin = $factory->makeSkin( $key );
 157                 } catch ( SkinException $e ) {
 158                         $skin = $factory->makeSkin( $wgFallbackSkin );
 159                 }
 160
 161                 return $skin;
 162         }
 163
 164         /**
 165          * @return string Skin name
 166          */
 167         public function getSkinName() {
 168                 return $this->skinname;
 169         }
 170
 171         /**
 172          * @param OutputPage $out
 173          */
 174         function initPage( OutputPage $out ) {
 175                 wfProfileIn( __METHOD__ );
 176
 177                 $this->preloadExistence();
 178
 179                 wfProfileOut( __METHOD__ );
 180         }
 181
 182         /**
 183          * Defines the ResourceLoader modules that should be added to the skin
 184          * It is recommended that skins wishing to override call parent::getDefaultModules()
 185          * and substitute out any modules they wish to change by using a key to look them up
 186          * @return array Array of modules with helper keys for easy overriding
 187          */
 188         public function getDefaultModules() {
 189                 global $wgIncludeLegacyJavaScript, $wgPreloadJavaScriptMwUtil, $wgUseAjax,
 190                         $wgAjaxWatch, $wgEnableAPI, $wgEnableWriteAPI;
 191
 192                 $out = $this->getOutput();
 193                 $user = $out->getUser();
 194                 $modules = array(
 195                         // modules that enhance the page content in some way
 196                         'content' => array(
 197                                 'mediawiki.page.ready',
 198                         ),
 199                         // modules that exist for legacy reasons
 200                         'legacy' => array(),
 201                         // modules relating to search functionality
 202                         'search' => array(),
 203                         // modules relating to functionality relating to watching an article
 204                         'watch' => array(),
 205                         // modules which relate to the current users preferences
 206                         'user' => array(),
 207                 );
 208                 if ( $wgIncludeLegacyJavaScript ) {
 209                         $modules['legacy'][] = 'mediawiki.legacy.wikibits';
 210                 }
 211
 212                 if ( $wgPreloadJavaScriptMwUtil ) {
 213                         $modules['legacy'][] = 'mediawiki.util';
 214                 }
 215
 216                 // Add various resources if required
 217                 if ( $wgUseAjax ) {
 218                         $modules['legacy'][] = 'mediawiki.legacy.ajax';
 219
 220                         if ( $wgEnableAPI ) {
 221                                 if ( $wgEnableWriteAPI && $wgAjaxWatch && $user->isLoggedIn()
 222                                         && $user->isAllowed( 'writeapi' )
 223                                 ) {
 224                                         $modules['watch'][] = 'mediawiki.page.watch.ajax';
 225                                 }
 226
 227                                 $modules['search'][] = 'mediawiki.searchSuggest';
 228                         }
 229                 }
 230
 231                 if ( $user->getBoolOption( 'editsectiononrightclick' ) ) {
 232                         $modules['user'][] = 'mediawiki.action.view.rightClickEdit';
 233                 }
 234
 235                 // Crazy edit-on-double-click stuff
 236                 if ( $out->isArticle() && $user->getOption( 'editondblclick' ) ) {
 237                         $modules['user'][] = 'mediawiki.action.view.dblClickEdit';
 238                 }
 239                 return $modules;
 240         }
 241
 242         /**
 243          * Preload the existence of three commonly-requested pages in a single query
 244          */
 245         function preloadExistence() {
 246                 $user = $this->getUser();
 247
 248                 // User/talk link
 249                 $titles = array( $user->getUserPage(), $user->getTalkPage() );
 250
 251                 // Other tab link
 252                 if ( $this->getTitle()->isSpecialPage() ) {
 253                         // nothing
 254                 } elseif ( $this->getTitle()->isTalkPage() ) {
 255                         $titles[] = $this->getTitle()->getSubjectPage();
 256                 } else {
 257                         $titles[] = $this->getTitle()->getTalkPage();
 258                 }
 259
 260                 $lb = new LinkBatch( $titles );
 261                 $lb->setCaller( __METHOD__ );
 262                 $lb->execute();
 263         }
 264
 265         /**
 266          * Get the current revision ID
 267          *
 268          * @return int
 269          */
 270         public function getRevisionId() {
 271                 return $this->getOutput()->getRevisionId();
 272         }
 273
 274         /**
 275          * Whether the revision displayed is the latest revision of the page
 276          *
 277          * @return bool
 278          */
 279         public function isRevisionCurrent() {
 280                 $revID = $this->getRevisionId();
 281                 return $revID == 0 || $revID == $this->getTitle()->getLatestRevID();
 282         }
 283
 284         /**
 285          * Set the "relevant" title
 286          * @see self::getRelevantTitle()
 287          * @param Title $t
 288          */
 289         public function setRelevantTitle( $t ) {
 290                 $this->mRelevantTitle = $t;
 291         }
 292
 293         /**
 294          * Return the "relevant" title.
 295          * A "relevant" title is not necessarily the actual title of the page.
 296          * Special pages like Special:MovePage use set the page they are acting on
 297          * as their "relevant" title, this allows the skin system to display things
 298          * such as content tabs which belong to to that page instead of displaying
 299          * a basic special page tab which has almost no meaning.
 300          *
 301          * @return Title
 302          */
 303         public function getRelevantTitle() {
 304                 if ( isset( $this->mRelevantTitle ) ) {
 305                         return $this->mRelevantTitle;
 306                 }
 307                 return $this->getTitle();
 308         }
 309
 310         /**
 311          * Set the "relevant" user
 312          * @see self::getRelevantUser()
 313          * @param User $u
 314          */
 315         public function setRelevantUser( $u ) {
 316                 $this->mRelevantUser = $u;
 317         }
 318
 319         /**
 320          * Return the "relevant" user.
 321          * A "relevant" user is similar to a relevant title. Special pages like
 322          * Special:Contributions mark the user which they are relevant to so that
 323          * things like the toolbox can display the information they usually are only
 324          * able to display on a user's userpage and talkpage.
 325          * @return User
 326          */
 327         public function getRelevantUser() {
 328                 if ( isset( $this->mRelevantUser ) ) {
 329                         return $this->mRelevantUser;
 330                 }
 331                 $title = $this->getRelevantTitle();
 332                 if ( $title->hasSubjectNamespace( NS_USER ) ) {
 333                         $rootUser = $title->getRootText();
 334                         if ( User::isIP( $rootUser ) ) {
 335                                 $this->mRelevantUser = User::newFromName( $rootUser, false );
 336                         } else {
 337                                 $user = User::newFromName( $rootUser, false );
 338                                 if ( $user && $user->isLoggedIn() ) {
 339                                         $this->mRelevantUser = $user;
 340                                 }
 341                         }
 342                         return $this->mRelevantUser;
 343                 }
 344                 return null;
 345         }
 346
 347         /**
 348          * Outputs the HTML generated by other functions.
 349          * @param OutputPage $out
 350          */
 351         abstract function outputPage( OutputPage $out = null );
 352
 353         /**
 354          * @param array $data
 355          * @return string
 356          */
 357         static function makeVariablesScript( $data ) {
 358                 if ( $data ) {
 359                         return Html::inlineScript(
 360                                 ResourceLoader::makeLoaderConditionalScript( ResourceLoader::makeConfigSetScript( $data ) )
 361                         );
 362                 } else {
 363                         return '';
 364                 }
 365         }
 366
 367         /**
 368          * Get the query to generate a dynamic stylesheet
 369          *
 370          * @return array
 371          */
 372         public static function getDynamicStylesheetQuery() {
 373                 global $wgSquidMaxage;
 374
 375                 return array(
 376                                 'action' => 'raw',
 377                                 'maxage' => $wgSquidMaxage,
 378                                 'usemsgcache' => 'yes',
 379                                 'ctype' => 'text/css',
 380                                 'smaxage' => $wgSquidMaxage,
 381                         );
 382         }
 383
 384         /**
 385          * Add skin specific stylesheets
 386          * Calling this method with an $out of anything but the same OutputPage
 387          * inside ->getOutput() is deprecated. The $out arg is kept
 388          * for compatibility purposes with skins.
 389          * @param OutputPage $out
 390          * @todo delete
 391          */
 392         abstract function setupSkinUserCss( OutputPage $out );
 393
 394         /**
 395          * TODO: document
 396          * @param Title $title
 397          * @return string
 398          */
 399         function getPageClasses( $title ) {
 400                 $numeric = 'ns-' . $title->getNamespace();
 401
 402                 if ( $title->isSpecialPage() ) {
 403                         $type = 'ns-special';
 404                         // bug 23315: provide a class based on the canonical special page name without subpages
 405                         list( $canonicalName ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 406                         if ( $canonicalName ) {
 407                                 $type .= ' ' . Sanitizer::escapeClass( "mw-special-$canonicalName" );
 408                         } else {
 409                                 $type .= ' mw-invalidspecialpage';
 410                         }
 411                 } elseif ( $title->isTalkPage() ) {
 412                         $type = 'ns-talk';
 413                 } else {
 414                         $type = 'ns-subject';
 415                 }
 416
 417                 $name = Sanitizer::escapeClass( 'page-' . $title->getPrefixedText() );
 418
 419                 return "$numeric $type $name";
 420         }
 421
 422         /*
 423          * Return values for <html> element
 424          * @return array of associative name-to-value elements for <html> element
 425          */
 426         public function getHtmlElementAttributes() {
 427                 $lang = $this->getLanguage();
 428                 return array(
 429                         'lang' => $lang->getHtmlCode(),
 430                         'dir' => $lang->getDir(),
 431                         'class' => 'client-nojs',
 432                 );
 433         }
 434
 435         /**
 436          * This will be called by OutputPage::headElement when it is creating the
 437          * "<body>" tag, skins can override it if they have a need to add in any
 438          * body attributes or classes of their own.
 439          * @param OutputPage $out
 440          * @param array $bodyAttrs
 441          */
 442         function addToBodyAttributes( $out, &$bodyAttrs ) {
 443                 // does nothing by default
 444         }
 445
 446         /**
 447          * URL to the logo
 448          * @return string
 449          */
 450         function getLogo() {
 451                 global $wgLogo;
 452                 return $wgLogo;
 453         }
 454
 455         /**
 456          * @return string
 457          */
 458         function getCategoryLinks() {
 459                 global $wgUseCategoryBrowser;
 460
 461                 $out = $this->getOutput();
 462                 $allCats = $out->getCategoryLinks();
 463
 464                 if ( !count( $allCats ) ) {
 465                         return '';
 466                 }
 467
 468                 $embed = "<li>";
 469                 $pop = "</li>";
 470
 471                 $s = '';
 472                 $colon = $this->msg( 'colon-separator' )->escaped();
 473
 474                 if ( !empty( $allCats['normal'] ) ) {
 475                         $t = $embed . implode( "{$pop}{$embed}", $allCats['normal'] ) . $pop;
 476
 477                         $msg = $this->msg( 'pagecategories' )->numParams( count( $allCats['normal'] ) )->escaped();
 478                         $linkPage = wfMessage( 'pagecategorieslink' )->inContentLanguage()->text();
 479                         $s .= '<div id="mw-normal-catlinks" class="mw-normal-catlinks">' .
 480                                 Linker::link( Title::newFromText( $linkPage ), $msg )
 481                                 . $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                 $data = '';
 583
 584                 if ( wfRunHooks( 'SkinAfterContent', array( &$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                 wfRunHooks( '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', '<a dir="ltr" href="' . $url
 643                         . '">' . $url . '</a>' )->text();
 644         }
 645
 646         /**
 647          * @return string
 648          */
 649         function getUndeleteLink() {
 650                 $action = $this->getRequest()->getVal( 'action', 'view' );
 651
 652                 if ( $this->getUser()->isAllowed( 'deletedhistory' ) &&
 653                         ( $this->getTitle()->getArticleID() == 0 || $action == 'history' ) ) {
 654                         $n = $this->getTitle()->isDeleted();
 655
 656                         if ( $n ) {
 657                                 if ( $this->getUser()->isAllowed( 'undelete' ) ) {
 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                                         )->text();
 668                         }
 669                 }
 670
 671                 return '';
 672         }
 673
 674         /**
 675          * @return string
 676          */
 677         function subPageSubtitle() {
 678                 $out = $this->getOutput();
 679                 $subpages = '';
 680
 681                 if ( !wfRunHooks( 'SkinSubPageSubtitle', array( &$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          * Returns true if the IP should be shown in the header
 729          * @return bool
 730          */
 731         function showIPinHeader() {
 732                 global $wgShowIPinHeader;
 733                 return $wgShowIPinHeader && session_id() != '';
 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                 wfRunHooks(
 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 $wgStylePath;
 833
 834                 $url = htmlspecialchars( "$wgStylePath/common/images/poweredby_mediawiki_88x31.png" );
 835                 $text = '<a href="//www.mediawiki.org/"><img src="' . $url
 836                         . '" height="31" width="88" alt="Powered by MediaWiki" /></a>';
 837                 wfRunHooks( 'SkinGetPoweredBy', array( &$text, $this ) );
 838                 return $text;
 839         }
 840
 841         /**
 842          * Get the timestamp of the latest revision, formatted in user language
 843          *
 844          * @return string
 845          */
 846         protected function lastModified() {
 847                 $timestamp = $this->getOutput()->getRevisionTimestamp();
 848
 849                 # No cached timestamp, load it from the database
 850                 if ( $timestamp === null ) {
 851                         $timestamp = Revision::getTimestampFromId( $this->getTitle(), $this->getRevisionId() );
 852                 }
 853
 854                 if ( $timestamp ) {
 855                         $d = $this->getLanguage()->userDate( $timestamp, $this->getUser() );
 856                         $t = $this->getLanguage()->userTime( $timestamp, $this->getUser() );
 857                         $s = ' ' . $this->msg( 'lastmodifiedat', $d, $t )->text();
 858                 } else {
 859                         $s = '';
 860                 }
 861
 862                 if ( wfGetLB()->getLaggedSlaveMode() ) {
 863                         $s .= ' <strong>' . $this->msg( 'laggedslavemode' )->text() . '</strong>';
 864                 }
 865
 866                 return $s;
 867         }
 868
 869         /**
 870          * @param string $align
 871          * @return string
 872          */
 873         function logoText( $align = '' ) {
 874                 if ( $align != '' ) {
 875                         $a = " style='float: {$align};'";
 876                 } else {
 877                         $a = '';
 878                 }
 879
 880                 $mp = $this->msg( 'mainpage' )->escaped();
 881                 $mptitle = Title::newMainPage();
 882                 $url = ( is_object( $mptitle ) ? htmlspecialchars( $mptitle->getLocalURL() ) : '' );
 883
 884                 $logourl = $this->getLogo();
 885                 $s = "<a href='{$url}'><img{$a} src='{$logourl}' alt='[{$mp}]' /></a>";
 886
 887                 return $s;
 888         }
 889
 890         /**
 891          * Renders a $wgFooterIcons icon according to the method's arguments
 892          * @param array $icon The icon to build the html for, see $wgFooterIcons
 893          *   for the format of this array.
 894          * @param bool|string $withImage Whether to use the icon's image or output
 895          *   a text-only footericon.
 896          * @return string HTML
 897          */
 898         function makeFooterIcon( $icon, $withImage = 'withImage' ) {
 899                 if ( is_string( $icon ) ) {
 900                         $html = $icon;
 901                 } else { // Assuming array
 902                         $url = isset( $icon["url"] ) ? $icon["url"] : null;
 903                         unset( $icon["url"] );
 904                         if ( isset( $icon["src"] ) && $withImage === 'withImage' ) {
 905                                 // do this the lazy way, just pass icon data as an attribute array
 906                                 $html = Html::element( 'img', $icon );
 907                         } else {
 908                                 $html = htmlspecialchars( $icon["alt"] );
 909                         }
 910                         if ( $url ) {
 911                                 $html = Html::rawElement( 'a', array( "href" => $url ), $html );
 912                         }
 913                 }
 914                 return $html;
 915         }
 916
 917         /**
 918          * Gets the link to the wiki's main page.
 919          * @return string
 920          */
 921         function mainPageLink() {
 922                 $s = Linker::linkKnown(
 923                         Title::newMainPage(),
 924                         $this->msg( 'mainpage' )->escaped()
 925                 );
 926
 927                 return $s;
 928         }
 929
 930         /**
 931          * Returns an HTML link for use in the footer
 932          * @param string $desc The i18n message key for the link text
 933          * @param string $page The i18n message key for the page to link to
 934          * @return string HTML anchor
 935          */
 936         public function footerLink( $desc, $page ) {
 937                 // if the link description has been set to "-" in the default language,
 938                 if ( $this->msg( $desc )->inContentLanguage()->isDisabled() ) {
 939                         // then it is disabled, for all languages.
 940                         return '';
 941                 } else {
 942                         // Otherwise, we display the link for the user, described in their
 943                         // language (which may or may not be the same as the default language),
 944                         // but we make the link target be the one site-wide page.
 945                         $title = Title::newFromText( $this->msg( $page )->inContentLanguage()->text() );
 946
 947                         return Linker::linkKnown(
 948                                 $title,
 949                                 $this->msg( $desc )->escaped()
 950                         );
 951                 }
 952         }
 953
 954         /**
 955          * Gets the link to the wiki's privacy policy page.
 956          * @return string HTML
 957          */
 958         function privacyLink() {
 959                 return $this->footerLink( 'privacy', 'privacypage' );
 960         }
 961
 962         /**
 963          * Gets the link to the wiki's about page.
 964          * @return string HTML
 965          */
 966         function aboutLink() {
 967                 return $this->footerLink( 'aboutsite', 'aboutpage' );
 968         }
 969
 970         /**
 971          * Gets the link to the wiki's general disclaimers page.
 972          * @return string HTML
 973          */
 974         function disclaimerLink() {
 975                 return $this->footerLink( 'disclaimers', 'disclaimerpage' );
 976         }
 977
 978         /**
 979          * Return URL options for the 'edit page' link.
 980          * This may include an 'oldid' specifier, if the current page view is such.
 981          *
 982          * @return array
 983          * @private
 984          */
 985         function editUrlOptions() {
 986                 $options = array( 'action' => 'edit' );
 987
 988                 if ( !$this->isRevisionCurrent() ) {
 989                         $options['oldid'] = intval( $this->getRevisionId() );
 990                 }
 991
 992                 return $options;
 993         }
 994
 995         /**
 996          * @param User|int $id
 997          * @return bool
 998          */
 999         function showEmailUser( $id ) {
1000                 if ( $id instanceof User ) {
1001                         $targetUser = $id;
1002                 } else {
1003                         $targetUser = User::newFromId( $id );
1004                 }
1005
1006                 # The sending user must have a confirmed email address and the target
1007                 # user must have a confirmed email address and allow emails from users.
1008                 return $this->getUser()->canSendEmail() &&
1009                         $targetUser->canReceiveEmail();
1010         }
1011
1012         /**
1013          * Return a fully resolved style path url to images or styles stored in the common folder.
1014          * This method returns a url resolved using the configured skin style path
1015          * and includes the style version inside of the url.
1016          * @param string $name The name or path of a skin resource file
1017          * @return string The fully resolved style path url including styleversion
1018          */
1019         function getCommonStylePath( $name ) {
1020                 global $wgStylePath, $wgStyleVersion;
1021                 return "$wgStylePath/common/$name?$wgStyleVersion";
1022         }
1023
1024         /**
1025          * Return a fully resolved style path url to images or styles stored in the current skins's folder.
1026          * This method returns a url resolved using the configured skin style path
1027          * and includes the style version inside of the url.
1028          *
1029          * Requires $stylename to be set, otherwise throws MWException.
1030          *
1031          * @param string $name The name or path of a skin resource file
1032          * @return string The fully resolved style path url including styleversion
1033          */
1034         function getSkinStylePath( $name ) {
1035                 global $wgStylePath, $wgStyleVersion;
1036
1037                 if ( $this->stylename === null ) {
1038                         $class = get_class( $this );
1039                         throw new MWException( "$class::\$stylename must be set to use getSkinStylePath()" );
1040                 }
1041
1042                 return "$wgStylePath/{$this->stylename}/$name?$wgStyleVersion";
1043         }
1044
1045         /* these are used extensively in SkinTemplate, but also some other places */
1046
1047         /**
1048          * @param string $urlaction
1049          * @return string
1050          */
1051         static function makeMainPageUrl( $urlaction = '' ) {
1052                 $title = Title::newMainPage();
1053                 self::checkTitle( $title, '' );
1054
1055                 return $title->getLocalURL( $urlaction );
1056         }
1057
1058         /**
1059          * Make a URL for a Special Page using the given query and protocol.
1060          *
1061          * If $proto is set to null, make a local URL. Otherwise, make a full
1062          * URL with the protocol specified.
1063          *
1064          * @param string $name Name of the Special page
1065          * @param string $urlaction Query to append
1066          * @param string|null $proto Protocol to use or null for a local URL
1067          * @return string
1068          */
1069         static function makeSpecialUrl( $name, $urlaction = '', $proto = null ) {
1070                 $title = SpecialPage::getSafeTitleFor( $name );
1071                 if ( is_null( $proto ) ) {
1072                         return $title->getLocalURL( $urlaction );
1073                 } else {
1074                         return $title->getFullURL( $urlaction, false, $proto );
1075                 }
1076         }
1077
1078         /**
1079          * @param string $name
1080          * @param string $subpage
1081          * @param string $urlaction
1082          * @return string
1083          */
1084         static function makeSpecialUrlSubpage( $name, $subpage, $urlaction = '' ) {
1085                 $title = SpecialPage::getSafeTitleFor( $name, $subpage );
1086                 return $title->getLocalURL( $urlaction );
1087         }
1088
1089         /**
1090          * @param string $name
1091          * @param string $urlaction
1092          * @return string
1093          */
1094         static function makeI18nUrl( $name, $urlaction = '' ) {
1095                 $title = Title::newFromText( wfMessage( $name )->inContentLanguage()->text() );
1096                 self::checkTitle( $title, $name );
1097                 return $title->getLocalURL( $urlaction );
1098         }
1099
1100         /**
1101          * @param string $name
1102          * @param string $urlaction
1103          * @return string
1104          */
1105         static function makeUrl( $name, $urlaction = '' ) {
1106                 $title = Title::newFromText( $name );
1107                 self::checkTitle( $title, $name );
1108
1109                 return $title->getLocalURL( $urlaction );
1110         }
1111
1112         /**
1113          * If url string starts with http, consider as external URL, else
1114          * internal
1115          * @param string $name
1116          * @return string URL
1117          */
1118         static function makeInternalOrExternalUrl( $name ) {
1119                 if ( preg_match( '/^(?i:' . wfUrlProtocols() . ')/', $name ) ) {
1120                         return $name;
1121                 } else {
1122                         return self::makeUrl( $name );
1123                 }
1124         }
1125
1126         /**
1127          * this can be passed the NS number as defined in Language.php
1128          * @param string $name
1129          * @param string $urlaction
1130          * @param int $namespace
1131          * @return string
1132          */
1133         static function makeNSUrl( $name, $urlaction = '', $namespace = NS_MAIN ) {
1134                 $title = Title::makeTitleSafe( $namespace, $name );
1135                 self::checkTitle( $title, $name );
1136
1137                 return $title->getLocalURL( $urlaction );
1138         }
1139
1140         /**
1141          * these return an array with the 'href' and boolean 'exists'
1142          * @param string $name
1143          * @param string $urlaction
1144          * @return array
1145          */
1146         static function makeUrlDetails( $name, $urlaction = '' ) {
1147                 $title = Title::newFromText( $name );
1148                 self::checkTitle( $title, $name );
1149
1150                 return array(
1151                         'href' => $title->getLocalURL( $urlaction ),
1152                         'exists' => $title->getArticleID() != 0,
1153                 );
1154         }
1155
1156         /**
1157          * Make URL details where the article exists (or at least it's convenient to think so)
1158          * @param string $name Article name
1159          * @param string $urlaction
1160          * @return array
1161          */
1162         static function makeKnownUrlDetails( $name, $urlaction = '' ) {
1163                 $title = Title::newFromText( $name );
1164                 self::checkTitle( $title, $name );
1165
1166                 return array(
1167                         'href' => $title->getLocalURL( $urlaction ),
1168                         'exists' => true
1169                 );
1170         }
1171
1172         /**
1173          * make sure we have some title to operate on
1174          *
1175          * @param Title $title
1176          * @param string $name
1177          */
1178         static function checkTitle( &$title, $name ) {
1179                 if ( !is_object( $title ) ) {
1180                         $title = Title::newFromText( $name );
1181                         if ( !is_object( $title ) ) {
1182                                 $title = Title::newFromText( '--error: link target missing--' );
1183                         }
1184                 }
1185         }
1186
1187         /**
1188          * Build an array that represents the sidebar(s), the navigation bar among them.
1189          *
1190          * BaseTemplate::getSidebar can be used to simplify the format and id generation in new skins.
1191          *
1192          * The format of the returned array is array( heading => content, ... ), where:
1193          * - heading is the heading of a navigation portlet. It is either:
1194          *   - magic string to be handled by the skins ('SEARCH' / 'LANGUAGES' / 'TOOLBOX' / ...)
1195          *   - a message name (e.g. 'navigation'), the message should be HTML-escaped by the skin
1196          *   - plain text, which should be HTML-escaped by the skin
1197          * - content is the contents of the portlet. It is either:
1198          *   - HTML text (<ul><li>...</li>...</ul>)
1199          *   - array of link data in a format accepted by BaseTemplate::makeListItem()
1200          *   - (for a magic string as a key, any value)
1201          *
1202          * Note that extensions can control the sidebar contents using the SkinBuildSidebar hook
1203          * and can technically insert anything in here; skin creators are expected to handle
1204          * values described above.
1205          *
1206          * @return array
1207          */
1208         function buildSidebar() {
1209                 global $wgMemc, $wgEnableSidebarCache, $wgSidebarCacheExpiry;
1210                 wfProfileIn( __METHOD__ );
1211
1212                 $key = wfMemcKey( 'sidebar', $this->getLanguage()->getCode() );
1213
1214                 if ( $wgEnableSidebarCache ) {
1215                         $cachedsidebar = $wgMemc->get( $key );
1216                         if ( $cachedsidebar ) {
1217                                 wfRunHooks( 'SidebarBeforeOutput', array( $this, &$cachedsidebar ) );
1218
1219                                 wfProfileOut( __METHOD__ );
1220                                 return $cachedsidebar;
1221                         }
1222                 }
1223
1224                 $bar = array();
1225                 $this->addToSidebar( $bar, 'sidebar' );
1226
1227                 wfRunHooks( 'SkinBuildSidebar', array( $this, &$bar ) );
1228                 if ( $wgEnableSidebarCache ) {
1229                         $wgMemc->set( $key, $bar, $wgSidebarCacheExpiry );
1230                 }
1231
1232                 wfRunHooks( 'SidebarBeforeOutput', array( $this, &$bar ) );
1233
1234                 wfProfileOut( __METHOD__ );
1235                 return $bar;
1236         }
1237
1238         /**
1239          * Add content from a sidebar system message
1240          * Currently only used for MediaWiki:Sidebar (but may be used by Extensions)
1241          *
1242          * This is just a wrapper around addToSidebarPlain() for backwards compatibility
1243          *
1244          * @param array $bar
1245          * @param string $message
1246          */
1247         function addToSidebar( &$bar, $message ) {
1248                 $this->addToSidebarPlain( $bar, wfMessage( $message )->inContentLanguage()->plain() );
1249         }
1250
1251         /**
1252          * Add content from plain text
1253          * @since 1.17
1254          * @param array $bar
1255          * @param string $text
1256          * @return array
1257          */
1258         function addToSidebarPlain( &$bar, $text ) {
1259                 $lines = explode( "\n", $text );
1260
1261                 $heading = '';
1262
1263                 foreach ( $lines as $line ) {
1264                         if ( strpos( $line, '*' ) !== 0 ) {
1265                                 continue;
1266                         }
1267                         $line = rtrim( $line, "\r" ); // for Windows compat
1268
1269                         if ( strpos( $line, '**' ) !== 0 ) {
1270                                 $heading = trim( $line, '* ' );
1271                                 if ( !array_key_exists( $heading, $bar ) ) {
1272                                         $bar[$heading] = array();
1273                                 }
1274                         } else {
1275                                 $line = trim( $line, '* ' );
1276
1277                                 if ( strpos( $line, '|' ) !== false ) { // sanity check
1278                                         $line = MessageCache::singleton()->transform( $line, false, null, $this->getTitle() );
1279                                         $line = array_map( 'trim', explode( '|', $line, 2 ) );
1280                                         if ( count( $line ) !== 2 ) {
1281                                                 // Second sanity check, could be hit by people doing
1282                                                 // funky stuff with parserfuncs... (bug 33321)
1283                                                 continue;
1284                                         }
1285
1286                                         $extraAttribs = array();
1287
1288                                         $msgLink = $this->msg( $line[0] )->inContentLanguage();
1289                                         if ( $msgLink->exists() ) {
1290                                                 $link = $msgLink->text();
1291                                                 if ( $link == '-' ) {
1292                                                         continue;
1293                                                 }
1294                                         } else {
1295                                                 $link = $line[0];
1296                                         }
1297                                         $msgText = $this->msg( $line[1] );
1298                                         if ( $msgText->exists() ) {
1299                                                 $text = $msgText->text();
1300                                         } else {
1301                                                 $text = $line[1];
1302                                         }
1303
1304                                         if ( preg_match( '/^(?i:' . wfUrlProtocols() . ')/', $link ) ) {
1305                                                 $href = $link;
1306
1307                                                 // Parser::getExternalLinkAttribs won't work here because of the Namespace things
1308                                                 global $wgNoFollowLinks, $wgNoFollowDomainExceptions;
1309                                                 if ( $wgNoFollowLinks && !wfMatchesDomainList( $href, $wgNoFollowDomainExceptions ) ) {
1310                                                         $extraAttribs['rel'] = 'nofollow';
1311                                                 }
1312
1313                                                 global $wgExternalLinkTarget;
1314                                                 if ( $wgExternalLinkTarget ) {
1315                                                         $extraAttribs['target'] = $wgExternalLinkTarget;
1316                                                 }
1317                                         } else {
1318                                                 $title = Title::newFromText( $link );
1319
1320                                                 if ( $title ) {
1321                                                         $title = $title->fixSpecialName();
1322                                                         $href = $title->getLinkURL();
1323                                                 } else {
1324                                                         $href = 'INVALID-TITLE';
1325                                                 }
1326                                         }
1327
1328                                         $bar[$heading][] = array_merge( array(
1329                                                 'text' => $text,
1330                                                 'href' => $href,
1331                                                 'id' => 'n-' . Sanitizer::escapeId( strtr( $line[1], ' ', '-' ), 'noninitial' ),
1332                                                 'active' => false
1333                                         ), $extraAttribs );
1334                                 } else {
1335                                         continue;
1336                                 }
1337                         }
1338                 }
1339
1340                 return $bar;
1341         }
1342
1343         /**
1344          * This function previously controlled whether the 'mediawiki.legacy.wikiprintable' module
1345          * should be loaded by OutputPage. That module no longer exists and the return value of this
1346          * method is ignored.
1347          *
1348          * If your skin doesn't provide its own print styles, the 'mediawiki.legacy.commonPrint' module
1349          * can be used instead (SkinTemplate-based skins do it automatically).
1350          *
1351          * @deprecated since 1.22
1352          * @return bool
1353          */
1354         public function commonPrintStylesheet() {
1355                 wfDeprecated( __METHOD__, '1.22' );
1356                 return false;
1357         }
1358
1359         /**
1360          * Gets new talk page messages for the current user and returns an
1361          * appropriate alert message (or an empty string if there are no messages)
1362          * @return string
1363          */
1364         function getNewtalks() {
1365
1366                 $newMessagesAlert = '';
1367                 $user = $this->getUser();
1368                 $newtalks = $user->getNewMessageLinks();
1369                 $out = $this->getOutput();
1370
1371                 // Allow extensions to disable or modify the new messages alert
1372                 if ( !wfRunHooks( 'GetNewMessagesAlert', array( &$newMessagesAlert, $newtalks, $user, $out ) ) ) {
1373                         return '';
1374                 }
1375                 if ( $newMessagesAlert ) {
1376                         return $newMessagesAlert;
1377                 }
1378
1379                 if ( count( $newtalks ) == 1 && $newtalks[0]['wiki'] === wfWikiID() ) {
1380                         $uTalkTitle = $user->getTalkPage();
1381                         $lastSeenRev = isset( $newtalks[0]['rev'] ) ? $newtalks[0]['rev'] : null;
1382                         $nofAuthors = 0;
1383                         if ( $lastSeenRev !== null ) {
1384                                 $plural = true; // Default if we have a last seen revision: if unknown, use plural
1385                                 $latestRev = Revision::newFromTitle( $uTalkTitle, false, Revision::READ_NORMAL );
1386                                 if ( $latestRev !== null ) {
1387                                         // Singular if only 1 unseen revision, plural if several unseen revisions.
1388                                         $plural = $latestRev->getParentId() !== $lastSeenRev->getId();
1389                                         $nofAuthors = $uTalkTitle->countAuthorsBetween(
1390                                                 $lastSeenRev, $latestRev, 10, 'include_new' );
1391                                 }
1392                         } else {
1393                                 // Singular if no revision -> diff link will show latest change only in any case
1394                                 $plural = false;
1395                         }
1396                         $plural = $plural ? 999 : 1;
1397                         // 999 signifies "more than one revision". We don't know how many, and even if we did,
1398                         // the number of revisions or authors is not necessarily the same as the number of
1399                         // "messages".
1400                         $newMessagesLink = Linker::linkKnown(
1401                                 $uTalkTitle,
1402                                 $this->msg( 'newmessageslinkplural' )->params( $plural )->escaped(),
1403                                 array(),
1404                                 array( 'redirect' => 'no' )
1405                         );
1406
1407                         $newMessagesDiffLink = Linker::linkKnown(
1408                                 $uTalkTitle,
1409                                 $this->msg( 'newmessagesdifflinkplural' )->params( $plural )->escaped(),
1410                                 array(),
1411                                 $lastSeenRev !== null
1412                                         ? array( 'oldid' => $lastSeenRev->getId(), 'diff' => 'cur' )
1413                                         : array( 'diff' => 'cur' )
1414                         );
1415
1416                         if ( $nofAuthors >= 1 && $nofAuthors <= 10 ) {
1417                                 $newMessagesAlert = $this->msg(
1418                                         'youhavenewmessagesfromusers',
1419                                         $newMessagesLink,
1420                                         $newMessagesDiffLink
1421                                 )->numParams( $nofAuthors, $plural );
1422                         } else {
1423                                 // $nofAuthors === 11 signifies "11 or more" ("more than 10")
1424                                 $newMessagesAlert = $this->msg(
1425                                         $nofAuthors > 10 ? 'youhavenewmessagesmanyusers' : 'youhavenewmessages',
1426                                         $newMessagesLink,
1427                                         $newMessagesDiffLink
1428                                 )->numParams( $plural );
1429                         }
1430                         $newMessagesAlert = $newMessagesAlert->text();
1431                         # Disable Squid cache
1432                         $out->setSquidMaxage( 0 );
1433                 } elseif ( count( $newtalks ) ) {
1434                         $sep = $this->msg( 'newtalkseparator' )->escaped();
1435                         $msgs = array();
1436
1437                         foreach ( $newtalks as $newtalk ) {
1438                                 $msgs[] = Xml::element(
1439                                         'a',
1440                                         array( 'href' => $newtalk['link'] ), $newtalk['wiki']
1441                                 );
1442                         }
1443                         $parts = implode( $sep, $msgs );
1444                         $newMessagesAlert = $this->msg( 'youhavenewmessagesmulti' )->rawParams( $parts )->escaped();
1445                         $out->setSquidMaxage( 0 );
1446                 }
1447
1448                 return $newMessagesAlert;
1449         }
1450
1451         /**
1452          * Get a cached notice
1453          *
1454          * @param string $name Message name, or 'default' for $wgSiteNotice
1455          * @return string HTML fragment
1456          */
1457         private function getCachedNotice( $name ) {
1458                 global $wgRenderHashAppend, $parserMemc, $wgContLang;
1459
1460                 wfProfileIn( __METHOD__ );
1461
1462                 $needParse = false;
1463
1464                 if ( $name === 'default' ) {
1465                         // special case
1466                         global $wgSiteNotice;
1467                         $notice = $wgSiteNotice;
1468                         if ( empty( $notice ) ) {
1469                                 wfProfileOut( __METHOD__ );
1470                                 return false;
1471                         }
1472                 } else {
1473                         $msg = $this->msg( $name )->inContentLanguage();
1474                         if ( $msg->isDisabled() ) {
1475                                 wfProfileOut( __METHOD__ );
1476                                 return false;
1477                         }
1478                         $notice = $msg->plain();
1479                 }
1480
1481                 // Use the extra hash appender to let eg SSL variants separately cache.
1482                 $key = wfMemcKey( $name . $wgRenderHashAppend );
1483                 $cachedNotice = $parserMemc->get( $key );
1484                 if ( is_array( $cachedNotice ) ) {
1485                         if ( md5( $notice ) == $cachedNotice['hash'] ) {
1486                                 $notice = $cachedNotice['html'];
1487                         } else {
1488                                 $needParse = true;
1489                         }
1490                 } else {
1491                         $needParse = true;
1492                 }
1493
1494                 if ( $needParse ) {
1495                         $parsed = $this->getOutput()->parse( $notice );
1496                         $parserMemc->set( $key, array( 'html' => $parsed, 'hash' => md5( $notice ) ), 600 );
1497                         $notice = $parsed;
1498                 }
1499
1500                 $notice = Html::rawElement( 'div', array( 'id' => 'localNotice',
1501                         'lang' => $wgContLang->getHtmlCode(), 'dir' => $wgContLang->getDir() ), $notice );
1502                 wfProfileOut( __METHOD__ );
1503                 return $notice;
1504         }
1505
1506         /**
1507          * Get a notice based on page's namespace
1508          *
1509          * @return string HTML fragment
1510          */
1511         function getNamespaceNotice() {
1512                 wfProfileIn( __METHOD__ );
1513
1514                 $key = 'namespacenotice-' . $this->getTitle()->getNsText();
1515                 $namespaceNotice = $this->getCachedNotice( $key );
1516                 if ( $namespaceNotice && substr( $namespaceNotice, 0, 7 ) != '<p>&lt;' ) {
1517                         $namespaceNotice = '<div id="namespacebanner">' . $namespaceNotice . '</div>';
1518                 } else {
1519                         $namespaceNotice = '';
1520                 }
1521
1522                 wfProfileOut( __METHOD__ );
1523                 return $namespaceNotice;
1524         }
1525
1526         /**
1527          * Get the site notice
1528          *
1529          * @return string HTML fragment
1530          */
1531         function getSiteNotice() {
1532                 wfProfileIn( __METHOD__ );
1533                 $siteNotice = '';
1534
1535                 if ( wfRunHooks( 'SiteNoticeBefore', array( &$siteNotice, $this ) ) ) {
1536                         if ( is_object( $this->getUser() ) && $this->getUser()->isLoggedIn() ) {
1537                                 $siteNotice = $this->getCachedNotice( 'sitenotice' );
1538                         } else {
1539                                 $anonNotice = $this->getCachedNotice( 'anonnotice' );
1540                                 if ( !$anonNotice ) {
1541                                         $siteNotice = $this->getCachedNotice( 'sitenotice' );
1542                                 } else {
1543                                         $siteNotice = $anonNotice;
1544                                 }
1545                         }
1546                         if ( !$siteNotice ) {
1547                                 $siteNotice = $this->getCachedNotice( 'default' );
1548                         }
1549                 }
1550
1551                 wfRunHooks( 'SiteNoticeAfter', array( &$siteNotice, $this ) );
1552                 wfProfileOut( __METHOD__ );
1553                 return $siteNotice;
1554         }
1555
1556         /**
1557          * Create a section edit link.  This supersedes editSectionLink() and
1558          * editSectionLinkForOther().
1559          *
1560          * @param Title $nt The title being linked to (may not be the same as
1561          *   the current page, if the section is included from a template)
1562          * @param string $section The designation of the section being pointed to,
1563          *   to be included in the link, like "&section=$section"
1564          * @param string $tooltip The tooltip to use for the link: will be escaped
1565          *   and wrapped in the 'editsectionhint' message
1566          * @param string $lang Language code
1567          * @return string HTML to use for edit link
1568          */
1569         public function doEditSectionLink( Title $nt, $section, $tooltip = null, $lang = false ) {
1570                 // HTML generated here should probably have userlangattributes
1571                 // added to it for LTR text on RTL pages
1572
1573                 $lang = wfGetLangObj( $lang );
1574
1575                 $attribs = array();
1576                 if ( !is_null( $tooltip ) ) {
1577                         # Bug 25462: undo double-escaping.
1578                         $tooltip = Sanitizer::decodeCharReferences( $tooltip );
1579                         $attribs['title'] = wfMessage( 'editsectionhint' )->rawParams( $tooltip )
1580                                 ->inLanguage( $lang )->text();
1581                 }
1582                 $link = Linker::link( $nt, wfMessage( 'editsection' )->inLanguage( $lang )->text(),
1583                         $attribs,
1584                         array( 'action' => 'edit', 'section' => $section ),
1585                         array( 'noclasses', 'known' )
1586                 );
1587
1588                 # Add the brackets and the span and run the hook.
1589                 $result = '<span class="mw-editsection">'
1590                         . '<span class="mw-editsection-bracket">[</span>'
1591                         . $link
1592                         . '<span class="mw-editsection-bracket">]</span>'
1593                         . '</span>';
1594
1595                 wfRunHooks( 'DoEditSectionLink', array( $this, $nt, $section, $tooltip, &$result, $lang ) );
1596                 return $result;
1597         }
1598
1599         /**
1600          * Use PHP's magic __call handler to intercept legacy calls to the linker
1601          * for backwards compatibility.
1602          *
1603          * @param string $fname Name of called method
1604          * @param array $args Arguments to the method
1605          * @throws MWException
1606          * @return mixed
1607          */
1608         function __call( $fname, $args ) {
1609                 $realFunction = array( 'Linker', $fname );
1610                 if ( is_callable( $realFunction ) ) {
1611                         wfDeprecated( get_class( $this ) . '::' . $fname, '1.21' );
1612                         return call_user_func_array( $realFunction, $args );
1613                 } else {
1614                         $className = get_class( $this );
1615                         throw new MWException( "Call to undefined method $className::$fname" );
1616                 }
1617         }
1618
1619 }