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