includes/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  * This base class is also the "Standard" skin.
  30  *
  31  * See docs/skin.txt for more information.
  32  *
  33  * @ingroup Skins
  34  */
  35 abstract class Skin extends ContextSource {
  36         protected $skinname = 'standard';
  37         protected $mRelevantTitle = null;
  38         protected $mRelevantUser = null;
  39
  40         /**
  41          * Fetch the set of available skins.
  42          * @return array associative array of strings
  43          */
  44         static function getSkinNames() {
  45                 global $wgValidSkinNames;
  46                 static $skinsInitialised = false;
  47
  48                 if ( !$skinsInitialised || !count( $wgValidSkinNames ) ) {
  49                         # Get a list of available skins
  50                         # Build using the regular expression '^(.*).php$'
  51                         # Array keys are all lower case, array value keep the case used by filename
  52                         #
  53                         wfProfileIn( __METHOD__ . '-init' );
  54
  55                         global $wgStyleDirectory;
  56
  57                         $skinDir = dir( $wgStyleDirectory );
  58
  59                         if ( $skinDir !== false && $skinDir !== null ) {
  60                                 # while code from www.php.net
  61                                 while ( false !== ( $file = $skinDir->read() ) ) {
  62                                         // Skip non-PHP files, hidden files, and '.dep' includes
  63                                         $matches = array();
  64
  65                                         if ( preg_match( '/^([^.]*)\.php$/', $file, $matches ) ) {
  66                                                 $aSkin = $matches[1];
  67                                                 $wgValidSkinNames[strtolower( $aSkin )] = $aSkin;
  68                                         }
  69                                 }
  70                                 $skinDir->close();
  71                         }
  72                         $skinsInitialised = true;
  73                         wfProfileOut( __METHOD__ . '-init' );
  74                 }
  75                 return $wgValidSkinNames;
  76         }
  77
  78         /**
  79          * Fetch the skinname messages for available skins.
  80          * @return array of strings
  81          */
  82         static function getSkinNameMessages() {
  83                 $messages = array();
  84                 foreach ( self::getSkinNames() as $skinKey => $skinName ) {
  85                         // Messages: skinname-cologneblue, skinname-monobook, skinname-modern, skinname-vector
  86                         $messages[] = "skinname-$skinKey";
  87                 }
  88                 return $messages;
  89         }
  90
  91         /**
  92          * Fetch the list of user-selectable skins in regards to $wgSkipSkins.
  93          * Useful for Special:Preferences and other places where you
  94          * only want to show skins users _can_ use.
  95          * @return array of strings
  96          */
  97         public static function getUsableSkins() {
  98                 global $wgSkipSkins;
  99
 100                 $allowedSkins = self::getSkinNames();
 101
 102                 foreach ( $wgSkipSkins as $skip ) {
 103                         unset( $allowedSkins[$skip] );
 104                 }
 105
 106                 return $allowedSkins;
 107         }
 108
 109         /**
 110          * Normalize a skin preference value to a form that can be loaded.
 111          * If a skin can't be found, it will fall back to the configured
 112          * default (or the old 'Classic' skin if that's broken).
 113          * @param string $key 'monobook', 'standard', etc.
 114          * @return string
 115          */
 116         static function normalizeKey( $key ) {
 117                 global $wgDefaultSkin;
 118
 119                 $skinNames = Skin::getSkinNames();
 120
 121                 if ( $key == '' || $key == 'default' ) {
 122                         // Don't return the default immediately;
 123                         // in a misconfiguration we need to fall back.
 124                         $key = $wgDefaultSkin;
 125                 }
 126
 127                 if ( isset( $skinNames[$key] ) ) {
 128                         return $key;
 129                 }
 130
 131                 // Older versions of the software used a numeric setting
 132                 // in the user preferences.
 133                 $fallback = array(
 134                         0 => $wgDefaultSkin,
 135                         2 => 'cologneblue'
 136                 );
 137
 138                 if ( isset( $fallback[$key] ) ) {
 139                         $key = $fallback[$key];
 140                 }
 141
 142                 if ( isset( $skinNames[$key] ) ) {
 143                         return $key;
 144                 } elseif ( isset( $skinNames[$wgDefaultSkin] ) ) {
 145                         return $wgDefaultSkin;
 146                 } else {
 147                         return 'vector';
 148                 }
 149         }
 150
 151         /**
 152          * Factory method for loading a skin of a given type
 153          * @param string $key 'monobook', 'standard', etc.
 154          * @return Skin
 155          */
 156         static function &newFromKey( $key ) {
 157                 global $wgStyleDirectory;
 158
 159                 $key = Skin::normalizeKey( $key );
 160
 161                 $skinNames = Skin::getSkinNames();
 162                 $skinName = $skinNames[$key];
 163                 $className = "Skin{$skinName}";
 164
 165                 # Grab the skin class and initialise it.
 166                 if ( !class_exists( $className ) ) {
 167
 168                         require_once "{$wgStyleDirectory}/{$skinName}.php";
 169
 170                         # Check if we got if not fallback to default skin
 171                         if ( !class_exists( $className ) ) {
 172                                 # DO NOT die if the class isn't found. This breaks maintenance
 173                                 # scripts and can cause a user account to be unrecoverable
 174                                 # except by SQL manipulation if a previously valid skin name
 175                                 # is no longer valid.
 176                                 wfDebug( "Skin class does not exist: $className\n" );
 177                                 $className = 'SkinVector';
 178                                 require_once "{$wgStyleDirectory}/Vector.php";
 179                         }
 180                 }
 181                 $skin = new $className( $key );
 182                 return $skin;
 183         }
 184
 185         /**
 186          * @return string skin name
 187          */
 188         public function getSkinName() {
 189                 return $this->skinname;
 190         }
 191
 192         /**
 193          * @param $out OutputPage
 194          */
 195         function initPage( OutputPage $out ) {
 196                 wfProfileIn( __METHOD__ );
 197
 198                 $this->preloadExistence();
 199
 200                 wfProfileOut( __METHOD__ );
 201         }
 202
 203         /**
 204          * Defines the ResourceLoader modules that should be added to the skin
 205          * It is recommended that skins wishing to override call parent::getDefaultModules()
 206          * and substitute out any modules they wish to change by using a key to look them up
 207          * @return Array of modules with helper keys for easy overriding
 208          */
 209         public function getDefaultModules() {
 210                 global $wgIncludeLegacyJavaScript, $wgPreloadJavaScriptMwUtil, $wgUseAjax,
 211                         $wgAjaxWatch, $wgEnableAPI, $wgEnableWriteAPI;
 212
 213                 $out = $this->getOutput();
 214                 $user = $out->getUser();
 215                 $modules = array(
 216                         // modules that enhance the page content in some way
 217                         'content' => array(
 218                                 'mediawiki.page.ready',
 219                         ),
 220                         // modules that exist for legacy reasons
 221                         'legacy' => array(),
 222                         // modules relating to search functionality
 223                         'search' => array(),
 224                         // modules relating to functionality relating to watching an article
 225                         'watch' => array(),
 226                         // modules which relate to the current users preferences
 227                         'user' => array(),
 228                 );
 229                 if ( $wgIncludeLegacyJavaScript ) {
 230                         $modules['legacy'][] = 'mediawiki.legacy.wikibits';
 231                 }
 232
 233                 if ( $wgPreloadJavaScriptMwUtil ) {
 234                         $modules['legacy'][] = 'mediawiki.util';
 235                 }
 236
 237                 // Add various resources if required
 238                 if ( $wgUseAjax ) {
 239                         $modules['legacy'][] = 'mediawiki.legacy.ajax';
 240
 241                         if ( $wgEnableAPI ) {
 242                                 if ( $wgEnableWriteAPI && $wgAjaxWatch && $user->isLoggedIn()
 243                                         && $user->isAllowed( 'writeapi' )
 244                                 ) {
 245                                         $modules['watch'][] = 'mediawiki.page.watch.ajax';
 246                                 }
 247
 248                                 $modules['search'][] = 'mediawiki.searchSuggest';
 249                         }
 250                 }
 251
 252                 if ( $user->getBoolOption( 'editsectiononrightclick' ) ) {
 253                         $modules['user'][] = 'mediawiki.action.view.rightClickEdit';
 254                 }
 255
 256                 // Crazy edit-on-double-click stuff
 257                 if ( $out->isArticle() && $user->getOption( 'editondblclick' ) ) {
 258                         $modules['user'][] = 'mediawiki.action.view.dblClickEdit';
 259                 }
 260                 return $modules;
 261         }
 262
 263         /**
 264          * Preload the existence of three commonly-requested pages in a single query
 265          */
 266         function preloadExistence() {
 267                 $user = $this->getUser();
 268
 269                 // User/talk link
 270                 $titles = array( $user->getUserPage(), $user->getTalkPage() );
 271
 272                 // Other tab link
 273                 if ( $this->getTitle()->isSpecialPage() ) {
 274                         // nothing
 275                 } elseif ( $this->getTitle()->isTalkPage() ) {
 276                         $titles[] = $this->getTitle()->getSubjectPage();
 277                 } else {
 278                         $titles[] = $this->getTitle()->getTalkPage();
 279                 }
 280
 281                 $lb = new LinkBatch( $titles );
 282                 $lb->setCaller( __METHOD__ );
 283                 $lb->execute();
 284         }
 285
 286         /**
 287          * Get the current revision ID
 288          *
 289          * @return Integer
 290          */
 291         public function getRevisionId() {
 292                 return $this->getOutput()->getRevisionId();
 293         }
 294
 295         /**
 296          * Whether the revision displayed is the latest revision of the page
 297          *
 298          * @return Boolean
 299          */
 300         public function isRevisionCurrent() {
 301                 $revID = $this->getRevisionId();
 302                 return $revID == 0 || $revID == $this->getTitle()->getLatestRevID();
 303         }
 304
 305         /**
 306          * Set the "relevant" title
 307          * @see self::getRelevantTitle()
 308          * @param $t Title object to use
 309          */
 310         public function setRelevantTitle( $t ) {
 311                 $this->mRelevantTitle = $t;
 312         }
 313
 314         /**
 315          * Return the "relevant" title.
 316          * A "relevant" title is not necessarily the actual title of the page.
 317          * Special pages like Special:MovePage use set the page they are acting on
 318          * as their "relevant" title, this allows the skin system to display things
 319          * such as content tabs which belong to to that page instead of displaying
 320          * a basic special page tab which has almost no meaning.
 321          *
 322          * @return Title
 323          */
 324         public function getRelevantTitle() {
 325                 if ( isset( $this->mRelevantTitle ) ) {
 326                         return $this->mRelevantTitle;
 327                 }
 328                 return $this->getTitle();
 329         }
 330
 331         /**
 332          * Set the "relevant" user
 333          * @see self::getRelevantUser()
 334          * @param $u User object to use
 335          */
 336         public function setRelevantUser( $u ) {
 337                 $this->mRelevantUser = $u;
 338         }
 339
 340         /**
 341          * Return the "relevant" user.
 342          * A "relevant" user is similar to a relevant title. Special pages like
 343          * Special:Contributions mark the user which they are relevant to so that
 344          * things like the toolbox can display the information they usually are only
 345          * able to display on a user's userpage and talkpage.
 346          * @return User
 347          */
 348         public function getRelevantUser() {
 349                 if ( isset( $this->mRelevantUser ) ) {
 350                         return $this->mRelevantUser;
 351                 }
 352                 $title = $this->getRelevantTitle();
 353                 if ( $title->hasSubjectNamespace( NS_USER ) ) {
 354                         $rootUser = $title->getRootText();
 355                         if ( User::isIP( $rootUser ) ) {
 356                                 $this->mRelevantUser = User::newFromName( $rootUser, false );
 357                         } else {
 358                                 $user = User::newFromName( $rootUser, false );
 359                                 if ( $user && $user->isLoggedIn() ) {
 360                                         $this->mRelevantUser = $user;
 361                                 }
 362                         }
 363                         return $this->mRelevantUser;
 364                 }
 365                 return null;
 366         }
 367
 368         /**
 369          * Outputs the HTML generated by other functions.
 370          * @param $out OutputPage
 371          */
 372         abstract function outputPage( OutputPage $out = null );
 373
 374         /**
 375          * @param $data array
 376          * @return string
 377          */
 378         static function makeVariablesScript( $data ) {
 379                 if ( $data ) {
 380                         return Html::inlineScript(
 381                                 ResourceLoader::makeLoaderConditionalScript( ResourceLoader::makeConfigSetScript( $data ) )
 382                         );
 383                 } else {
 384                         return '';
 385                 }
 386         }
 387
 388         /**
 389          * Make a "<script>" tag containing global variables
 390          *
 391          * @deprecated in 1.19
 392          * @param $unused
 393          * @return string HTML fragment
 394          */
 395         public static function makeGlobalVariablesScript( $unused ) {
 396                 global $wgOut;
 397
 398                 wfDeprecated( __METHOD__, '1.19' );
 399
 400                 return self::makeVariablesScript( $wgOut->getJSVars() );
 401         }
 402
 403         /**
 404          * Get the query to generate a dynamic stylesheet
 405          *
 406          * @return array
 407          */
 408         public static function getDynamicStylesheetQuery() {
 409                 global $wgSquidMaxage;
 410
 411                 return array(
 412                                 'action' => 'raw',
 413                                 'maxage' => $wgSquidMaxage,
 414                                 'usemsgcache' => 'yes',
 415                                 'ctype' => 'text/css',
 416                                 'smaxage' => $wgSquidMaxage,
 417                         );
 418         }
 419
 420         /**
 421          * Add skin specific stylesheets
 422          * Calling this method with an $out of anything but the same OutputPage
 423          * inside ->getOutput() is deprecated. The $out arg is kept
 424          * for compatibility purposes with skins.
 425          * @param $out OutputPage
 426          * @todo delete
 427          */
 428         abstract function setupSkinUserCss( OutputPage $out );
 429
 430         /**
 431          * TODO: document
 432          * @param $title Title
 433          * @return String
 434          */
 435         function getPageClasses( $title ) {
 436                 $numeric = 'ns-' . $title->getNamespace();
 437
 438                 if ( $title->isSpecialPage() ) {
 439                         $type = 'ns-special';
 440                         // bug 23315: provide a class based on the canonical special page name without subpages
 441                         list( $canonicalName ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 442                         if ( $canonicalName ) {
 443                                 $type .= ' ' . Sanitizer::escapeClass( "mw-special-$canonicalName" );
 444                         } else {
 445                                 $type .= ' mw-invalidspecialpage';
 446                         }
 447                 } elseif ( $title->isTalkPage() ) {
 448                         $type = 'ns-talk';
 449                 } else {
 450                         $type = 'ns-subject';
 451                 }
 452
 453                 $name = Sanitizer::escapeClass( 'page-' . $title->getPrefixedText() );
 454
 455                 return "$numeric $type $name";
 456         }
 457
 458         /*
 459          * Return values for <html> element
 460          * @return array of associative name-to-value elements for <html> element
 461          */
 462         public function getHtmlElementAttributes() {
 463                 $lang = $this->getLanguage();
 464                 return array(
 465                         'lang' => $lang->getHtmlCode(),
 466                         'dir' => $lang->getDir(),
 467                         'class' => 'client-nojs',
 468                 );
 469         }
 470
 471         /**
 472          * This will be called by OutputPage::headElement when it is creating the
 473          * "<body>" tag, skins can override it if they have a need to add in any
 474          * body attributes or classes of their own.
 475          * @param $out OutputPage
 476          * @param $bodyAttrs Array
 477          */
 478         function addToBodyAttributes( $out, &$bodyAttrs ) {
 479                 // does nothing by default
 480         }
 481
 482         /**
 483          * URL to the logo
 484          * @return String
 485          */
 486         function getLogo() {
 487                 global $wgLogo;
 488                 return $wgLogo;
 489         }
 490
 491         /**
 492          * @return string
 493          */
 494         function getCategoryLinks() {
 495                 global $wgUseCategoryBrowser;
 496
 497                 $out = $this->getOutput();
 498                 $allCats = $out->getCategoryLinks();
 499
 500                 if ( !count( $allCats ) ) {
 501                         return '';
 502                 }
 503
 504                 $embed = "<li>";
 505                 $pop = "</li>";
 506
 507                 $s = '';
 508                 $colon = $this->msg( 'colon-separator' )->escaped();
 509
 510                 if ( !empty( $allCats['normal'] ) ) {
 511                         $t = $embed . implode( "{$pop}{$embed}", $allCats['normal'] ) . $pop;
 512
 513                         $msg = $this->msg( 'pagecategories' )->numParams( count( $allCats['normal'] ) )->escaped();
 514                         $linkPage = wfMessage( 'pagecategorieslink' )->inContentLanguage()->text();
 515                         $s .= '<div id="mw-normal-catlinks" class="mw-normal-catlinks">' .
 516                                 Linker::link( Title::newFromText( $linkPage ), $msg )
 517                                 . $colon . '<ul>' . $t . '</ul>' . '</div>';
 518                 }
 519
 520                 # Hidden categories
 521                 if ( isset( $allCats['hidden'] ) ) {
 522                         if ( $this->getUser()->getBoolOption( 'showhiddencats' ) ) {
 523                                 $class = ' mw-hidden-cats-user-shown';
 524                         } elseif ( $this->getTitle()->getNamespace() == NS_CATEGORY ) {
 525                                 $class = ' mw-hidden-cats-ns-shown';
 526                         } else {
 527                                 $class = ' mw-hidden-cats-hidden';
 528                         }
 529
 530                         $s .= "<div id=\"mw-hidden-catlinks\" class=\"mw-hidden-catlinks$class\">" .
 531                                 $this->msg( 'hidden-categories' )->numParams( count( $allCats['hidden'] ) )->escaped() .
 532                                 $colon . '<ul>' . $embed . implode( "{$pop}{$embed}", $allCats['hidden'] ) . $pop . '</ul>' .
 533                                 '</div>';
 534                 }
 535
 536                 # optional 'dmoz-like' category browser. Will be shown under the list
 537                 # of categories an article belong to
 538                 if ( $wgUseCategoryBrowser ) {
 539                         $s .= '<br /><hr />';
 540
 541                         # get a big array of the parents tree
 542                         $parenttree = $this->getTitle()->getParentCategoryTree();
 543                         # Skin object passed by reference cause it can not be
 544                         # accessed under the method subfunction drawCategoryBrowser
 545                         $tempout = explode( "\n", $this->drawCategoryBrowser( $parenttree ) );
 546                         # Clean out bogus first entry and sort them
 547                         unset( $tempout[0] );
 548                         asort( $tempout );
 549                         # Output one per line
 550                         $s .= implode( "<br />\n", $tempout );
 551                 }
 552
 553                 return $s;
 554         }
 555
 556         /**
 557          * Render the array as a series of links.
 558          * @param array $tree categories tree returned by Title::getParentCategoryTree
 559          * @return String separated by &gt;, terminate with "\n"
 560          */
 561         function drawCategoryBrowser( $tree ) {
 562                 $return = '';
 563
 564                 foreach ( $tree as $element => $parent ) {
 565                         if ( empty( $parent ) ) {
 566                                 # element start a new list
 567                                 $return .= "\n";
 568                         } else {
 569                                 # grab the others elements
 570                                 $return .= $this->drawCategoryBrowser( $parent ) . ' &gt; ';
 571                         }
 572
 573                         # add our current element to the list
 574                         $eltitle = Title::newFromText( $element );
 575                         $return .= Linker::link( $eltitle, htmlspecialchars( $eltitle->getText() ) );
 576                 }
 577
 578                 return $return;
 579         }
 580
 581         /**
 582          * @return string
 583          */
 584         function getCategories() {
 585                 $out = $this->getOutput();
 586
 587                 $catlinks = $this->getCategoryLinks();
 588
 589                 $classes = 'catlinks';
 590
 591                 // Check what we're showing
 592                 $allCats = $out->getCategoryLinks();
 593                 $showHidden = $this->getUser()->getBoolOption( 'showhiddencats' ) ||
 594                                                 $this->getTitle()->getNamespace() == NS_CATEGORY;
 595
 596                 if ( empty( $allCats['normal'] ) && !( !empty( $allCats['hidden'] ) && $showHidden ) ) {
 597                         $classes .= ' catlinks-allhidden';
 598                 }
 599
 600                 return "<div id='catlinks' class='$classes'>{$catlinks}</div>";
 601         }
 602
 603         /**
 604          * This runs a hook to allow extensions placing their stuff after content
 605          * and article metadata (e.g. categories).
 606          * Note: This function has nothing to do with afterContent().
 607          *
 608          * This hook is placed here in order to allow using the same hook for all
 609          * skins, both the SkinTemplate based ones and the older ones, which directly
 610          * use this class to get their data.
 611          *
 612          * The output of this function gets processed in SkinTemplate::outputPage() for
 613          * the SkinTemplate based skins, all other skins should directly echo it.
 614          *
 615          * @return String, empty by default, if not changed by any hook function.
 616          */
 617         protected function afterContentHook() {
 618                 $data = '';
 619
 620                 if ( wfRunHooks( 'SkinAfterContent', array( &$data, $this ) ) ) {
 621                         // adding just some spaces shouldn't toggle the output
 622                         // of the whole <div/>, so we use trim() here
 623                         if ( trim( $data ) != '' ) {
 624                                 // Doing this here instead of in the skins to
 625                                 // ensure that the div has the same ID in all
 626                                 // skins
 627                                 $data = "<div id='mw-data-after-content'>\n" .
 628                                         "\t$data\n" .
 629                                         "</div>\n";
 630                         }
 631                 } else {
 632                         wfDebug( "Hook SkinAfterContent changed output processing.\n" );
 633                 }
 634
 635                 return $data;
 636         }
 637
 638         /**
 639          * Generate debug data HTML for displaying at the bottom of the main content
 640          * area.
 641          * @return String HTML containing debug data, if enabled (otherwise empty).
 642          */
 643         protected function generateDebugHTML() {
 644                 return MWDebug::getHTMLDebugLog();
 645         }
 646
 647         /**
 648          * This gets called shortly before the "</body>" tag.
 649          *
 650          * @return String HTML-wrapped JS code to be put before "</body>"
 651          */
 652         function bottomScripts() {
 653                 // TODO and the suckage continues. This function is really just a wrapper around
 654                 // OutputPage::getBottomScripts() which takes a Skin param. This should be cleaned
 655                 // up at some point
 656                 $bottomScriptText = $this->getOutput()->getBottomScripts();
 657                 wfRunHooks( 'SkinAfterBottomScripts', array( $this, &$bottomScriptText ) );
 658
 659                 return $bottomScriptText;
 660         }
 661
 662         /**
 663          * Text with the permalink to the source page,
 664          * usually shown on the footer of a printed page
 665          *
 666          * @return string HTML text with an URL
 667          */
 668         function printSource() {
 669                 $oldid = $this->getRevisionId();
 670                 if ( $oldid ) {
 671                         $url = htmlspecialchars( wfExpandIRI( $this->getTitle()->getCanonicalURL( 'oldid=' . $oldid ) ) );
 672                 } else {
 673                         // oldid not available for non existing pages
 674                         $url = htmlspecialchars( wfExpandIRI( $this->getTitle()->getCanonicalURL() ) );
 675                 }
 676                 return $this->msg( 'retrievedfrom', '<a href="' . $url . '">' . $url . '</a>' )->text();
 677         }
 678
 679         /**
 680          * @return String
 681          */
 682         function getUndeleteLink() {
 683                 $action = $this->getRequest()->getVal( 'action', 'view' );
 684
 685                 if ( $this->getUser()->isAllowed( 'deletedhistory' ) &&
 686                         ( $this->getTitle()->getArticleID() == 0 || $action == 'history' ) ) {
 687                         $n = $this->getTitle()->isDeleted();
 688
 689                         if ( $n ) {
 690                                 if ( $this->getUser()->isAllowed( 'undelete' ) ) {
 691                                         $msg = 'thisisdeleted';
 692                                 } else {
 693                                         $msg = 'viewdeleted';
 694                                 }
 695
 696                                 return $this->msg( $msg )->rawParams(
 697                                         Linker::linkKnown(
 698                                                 SpecialPage::getTitleFor( 'Undelete', $this->getTitle()->getPrefixedDBkey() ),
 699                                                 $this->msg( 'restorelink' )->numParams( $n )->escaped() )
 700                                         )->text();
 701                         }
 702                 }
 703
 704                 return '';
 705         }
 706
 707         /**
 708          * @return string
 709          */
 710         function subPageSubtitle() {
 711                 global $wgLang;
 712                 $out = $this->getOutput();
 713                 $subpages = '';
 714
 715                 if ( !wfRunHooks( 'SkinSubPageSubtitle', array( &$subpages, $this, $out ) ) ) {
 716                         return $subpages;
 717                 }
 718
 719                 if ( $out->isArticle() && MWNamespace::hasSubpages( $out->getTitle()->getNamespace() ) ) {
 720                         $ptext = $this->getTitle()->getPrefixedText();
 721                         if ( preg_match( '/\//', $ptext ) ) {
 722                                 $links = explode( '/', $ptext );
 723                                 array_pop( $links );
 724                                 $c = 0;
 725                                 $growinglink = '';
 726                                 $display = '';
 727
 728                                 foreach ( $links as $link ) {
 729                                         $growinglink .= $link;
 730                                         $display .= $link;
 731                                         $linkObj = Title::newFromText( $growinglink );
 732
 733                                         if ( is_object( $linkObj ) && $linkObj->isKnown() ) {
 734                                                 $getlink = Linker::linkKnown(
 735                                                         $linkObj,
 736                                                         htmlspecialchars( $display )
 737                                                 );
 738
 739                                                 $c++;
 740
 741                                                 if ( $c > 1 ) {
 742                                                         $subpages .= $wgLang->getDirMarkEntity() . $this->msg( 'pipe-separator' )->escaped();
 743                                                 } else {
 744                                                         $subpages .= '&lt; ';
 745                                                 }
 746
 747                                                 $subpages .= $getlink;
 748                                                 $display = '';
 749                                         } else {
 750                                                 $display .= '/';
 751                                         }
 752                                         $growinglink .= '/';
 753                                 }
 754                         }
 755                 }
 756
 757                 return $subpages;
 758         }
 759
 760         /**
 761          * Returns true if the IP should be shown in the header
 762          * @return Bool
 763          */
 764         function showIPinHeader() {
 765                 global $wgShowIPinHeader;
 766                 return $wgShowIPinHeader && session_id() != '';
 767         }
 768
 769         /**
 770          * @return String
 771          */
 772         function getSearchLink() {
 773                 $searchPage = SpecialPage::getTitleFor( 'Search' );
 774                 return $searchPage->getLocalURL();
 775         }
 776
 777         /**
 778          * @return string
 779          */
 780         function escapeSearchLink() {
 781                 return htmlspecialchars( $this->getSearchLink() );
 782         }
 783
 784         /**
 785          * @param $type string
 786          * @return string
 787          */
 788         function getCopyright( $type = 'detect' ) {
 789                 global $wgRightsPage, $wgRightsUrl, $wgRightsText, $wgContLang;
 790
 791                 if ( $type == 'detect' ) {
 792                         if ( !$this->isRevisionCurrent() && !$this->msg( 'history_copyright' )->inContentLanguage()->isDisabled() ) {
 793                                 $type = 'history';
 794                         } else {
 795                                 $type = 'normal';
 796                         }
 797                 }
 798
 799                 if ( $type == 'history' ) {
 800                         $msg = 'history_copyright';
 801                 } else {
 802                         $msg = 'copyright';
 803                 }
 804
 805                 if ( $wgRightsPage ) {
 806                         $title = Title::newFromText( $wgRightsPage );
 807                         $link = Linker::linkKnown( $title, $wgRightsText );
 808                 } elseif ( $wgRightsUrl ) {
 809                         $link = Linker::makeExternalLink( $wgRightsUrl, $wgRightsText );
 810                 } elseif ( $wgRightsText ) {
 811                         $link = $wgRightsText;
 812                 } else {
 813                         # Give up now
 814                         return '';
 815                 }
 816
 817                 // Allow for site and per-namespace customization of copyright notice.
 818                 $forContent = true;
 819
 820                 wfRunHooks( 'SkinCopyrightFooter', array( $this->getTitle(), $type, &$msg, &$link, &$forContent ) );
 821
 822                 $msgObj = $this->msg( $msg )->rawParams( $link );
 823                 if ( $forContent ) {
 824                         $msg = $msgObj->inContentLanguage()->text();
 825                         if ( $this->getLanguage()->getCode() !== $wgContLang->getCode() ) {
 826                                 $msg = Html::rawElement( 'span', array( 'lang' => $wgContLang->getHtmlCode(), 'dir' => $wgContLang->getDir() ), $msg );
 827                         }
 828                         return $msg;
 829                 } else {
 830                         return $msgObj->text();
 831                 }
 832         }
 833
 834         /**
 835          * @return null|string
 836          */
 837         function getCopyrightIcon() {
 838                 global $wgRightsUrl, $wgRightsText, $wgRightsIcon, $wgCopyrightIcon;
 839
 840                 $out = '';
 841
 842                 if ( isset( $wgCopyrightIcon ) && $wgCopyrightIcon ) {
 843                         $out = $wgCopyrightIcon;
 844                 } elseif ( $wgRightsIcon ) {
 845                         $icon = htmlspecialchars( $wgRightsIcon );
 846
 847                         if ( $wgRightsUrl ) {
 848                                 $url = htmlspecialchars( $wgRightsUrl );
 849                                 $out .= '<a href="' . $url . '">';
 850                         }
 851
 852                         $text = htmlspecialchars( $wgRightsText );
 853                         $out .= "<img src=\"$icon\" alt=\"$text\" width=\"88\" height=\"31\" />";
 854
 855                         if ( $wgRightsUrl ) {
 856                                 $out .= '</a>';
 857                         }
 858                 }
 859
 860                 return $out;
 861         }
 862
 863         /**
 864          * Gets the powered by MediaWiki icon.
 865          * @return string
 866          */
 867         function getPoweredBy() {
 868                 global $wgStylePath;
 869
 870                 $url = htmlspecialchars( "$wgStylePath/common/images/poweredby_mediawiki_88x31.png" );
 871                 $text = '<a href="//www.mediawiki.org/"><img src="' . $url . '" height="31" width="88" alt="Powered by MediaWiki" /></a>';
 872                 wfRunHooks( 'SkinGetPoweredBy', array( &$text, $this ) );
 873                 return $text;
 874         }
 875
 876         /**
 877          * Get the timestamp of the latest revision, formatted in user language
 878          *
 879          * @return String
 880          */
 881         protected function lastModified() {
 882                 $timestamp = $this->getOutput()->getRevisionTimestamp();
 883
 884                 # No cached timestamp, load it from the database
 885                 if ( $timestamp === null ) {
 886                         $timestamp = Revision::getTimestampFromId( $this->getTitle(), $this->getRevisionId() );
 887                 }
 888
 889                 if ( $timestamp ) {
 890                         $d = $this->getLanguage()->userDate( $timestamp, $this->getUser() );
 891                         $t = $this->getLanguage()->userTime( $timestamp, $this->getUser() );
 892                         $s = ' ' . $this->msg( 'lastmodifiedat', $d, $t )->text();
 893                 } else {
 894                         $s = '';
 895                 }
 896
 897                 if ( wfGetLB()->getLaggedSlaveMode() ) {
 898                         $s .= ' <strong>' . $this->msg( 'laggedslavemode' )->text() . '</strong>';
 899                 }
 900
 901                 return $s;
 902         }
 903
 904         /**
 905          * @param $align string
 906          * @return string
 907          */
 908         function logoText( $align = '' ) {
 909                 if ( $align != '' ) {
 910                         $a = " style='float: {$align};'";
 911                 } else {
 912                         $a = '';
 913                 }
 914
 915                 $mp = $this->msg( 'mainpage' )->escaped();
 916                 $mptitle = Title::newMainPage();
 917                 $url = ( is_object( $mptitle ) ? htmlspecialchars( $mptitle->getLocalURL() ) : '' );
 918
 919                 $logourl = $this->getLogo();
 920                 $s = "<a href='{$url}'><img{$a} src='{$logourl}' alt='[{$mp}]' /></a>";
 921
 922                 return $s;
 923         }
 924
 925         /**
 926          * Renders a $wgFooterIcons icon according to the method's arguments
 927          * @param array $icon The icon to build the html for, see $wgFooterIcons for the format of this array
 928          * @param bool|String $withImage Whether to use the icon's image or output a text-only footericon
 929          * @return String HTML
 930          */
 931         function makeFooterIcon( $icon, $withImage = 'withImage' ) {
 932                 if ( is_string( $icon ) ) {
 933                         $html = $icon;
 934                 } else { // Assuming array
 935                         $url = isset( $icon["url"] ) ? $icon["url"] : null;
 936                         unset( $icon["url"] );
 937                         if ( isset( $icon["src"] ) && $withImage === 'withImage' ) {
 938                                 $html = Html::element( 'img', $icon ); // do this the lazy way, just pass icon data as an attribute array
 939                         } else {
 940                                 $html = htmlspecialchars( $icon["alt"] );
 941                         }
 942                         if ( $url ) {
 943                                 $html = Html::rawElement( 'a', array( "href" => $url ), $html );
 944                         }
 945                 }
 946                 return $html;
 947         }
 948
 949         /**
 950          * Gets the link to the wiki's main page.
 951          * @return string
 952          */
 953         function mainPageLink() {
 954                 $s = Linker::linkKnown(
 955                         Title::newMainPage(),
 956                         $this->msg( 'mainpage' )->escaped()
 957                 );
 958
 959                 return $s;
 960         }
 961
 962         /**
 963          * Returns an HTML link for use in the footer
 964          * @param string $desc i18n message key for the link text
 965          * @param string $page i18n message key for the page to link to
 966          * @return string HTML anchor
 967          */
 968         public function footerLink( $desc, $page ) {
 969                 // if the link description has been set to "-" in the default language,
 970                 if ( $this->msg( $desc )->inContentLanguage()->isDisabled() ) {
 971                         // then it is disabled, for all languages.
 972                         return '';
 973                 } else {
 974                         // Otherwise, we display the link for the user, described in their
 975                         // language (which may or may not be the same as the default language),
 976                         // but we make the link target be the one site-wide page.
 977                         $title = Title::newFromText( $this->msg( $page )->inContentLanguage()->text() );
 978
 979                         return Linker::linkKnown(
 980                                 $title,
 981                                 $this->msg( $desc )->escaped()
 982                         );
 983                 }
 984         }
 985
 986         /**
 987          * Gets the link to the wiki's privacy policy page.
 988          * @return String HTML
 989          */
 990         function privacyLink() {
 991                 return $this->footerLink( 'privacy', 'privacypage' );
 992         }
 993
 994         /**
 995          * Gets the link to the wiki's about page.
 996          * @return String HTML
 997          */
 998         function aboutLink() {
 999                 return $this->footerLink( 'aboutsite', 'aboutpage' );
1000         }
1001
1002         /**
1003          * Gets the link to the wiki's general disclaimers page.
1004          * @return String HTML
1005          */
1006         function disclaimerLink() {
1007                 return $this->footerLink( 'disclaimers', 'disclaimerpage' );
1008         }
1009
1010         /**
1011          * Return URL options for the 'edit page' link.
1012          * This may include an 'oldid' specifier, if the current page view is such.
1013          *
1014          * @return array
1015          * @private
1016          */
1017         function editUrlOptions() {
1018                 $options = array( 'action' => 'edit' );
1019
1020                 if ( !$this->isRevisionCurrent() ) {
1021                         $options['oldid'] = intval( $this->getRevisionId() );
1022                 }
1023
1024                 return $options;
1025         }
1026
1027         /**
1028          * @param $id User|int
1029          * @return bool
1030          */
1031         function showEmailUser( $id ) {
1032                 if ( $id instanceof User ) {
1033                         $targetUser = $id;
1034                 } else {
1035                         $targetUser = User::newFromId( $id );
1036                 }
1037                 return $this->getUser()->canSendEmail() && # the sending user must have a confirmed email address
1038                         $targetUser->canReceiveEmail(); # the target user must have a confirmed email address and allow emails from users
1039         }
1040
1041         /**
1042          * Return a fully resolved style path url to images or styles stored in the common folder.
1043          * This method returns a url resolved using the configured skin style path
1044          * and includes the style version inside of the url.
1045          * @param string $name The name or path of a skin resource file
1046          * @return String The fully resolved style path url including styleversion
1047          */
1048         function getCommonStylePath( $name ) {
1049                 global $wgStylePath, $wgStyleVersion;
1050                 return "$wgStylePath/common/$name?$wgStyleVersion";
1051         }
1052
1053         /**
1054          * Return a fully resolved style path url to images or styles stored in the current skins's folder.
1055          * This method returns a url resolved using the configured skin style path
1056          * and includes the style version inside of the url.
1057          * @param string $name The name or path of a skin resource file
1058          * @return String The fully resolved style path url including styleversion
1059          */
1060         function getSkinStylePath( $name ) {
1061                 global $wgStylePath, $wgStyleVersion;
1062                 return "$wgStylePath/{$this->stylename}/$name?$wgStyleVersion";
1063         }
1064
1065         /* these are used extensively in SkinTemplate, but also some other places */
1066
1067         /**
1068          * @param $urlaction string
1069          * @return String
1070          */
1071         static function makeMainPageUrl( $urlaction = '' ) {
1072                 $title = Title::newMainPage();
1073                 self::checkTitle( $title, '' );
1074
1075                 return $title->getLocalURL( $urlaction );
1076         }
1077
1078         /**
1079          * Make a URL for a Special Page using the given query and protocol.
1080          *
1081          * If $proto is set to null, make a local URL. Otherwise, make a full
1082          * URL with the protocol specified.
1083          *
1084          * @param string $name Name of the Special page
1085          * @param string $urlaction Query to append
1086          * @param $proto Protocol to use or null for a local URL
1087          * @return String
1088          */
1089         static function makeSpecialUrl( $name, $urlaction = '', $proto = null ) {
1090                 $title = SpecialPage::getSafeTitleFor( $name );
1091                 if ( is_null( $proto ) ) {
1092                         return $title->getLocalURL( $urlaction );
1093                 } else {
1094                         return $title->getFullURL( $urlaction, false, $proto );
1095                 }
1096         }
1097
1098         /**
1099          * @param $name string
1100          * @param $subpage string
1101          * @param $urlaction string
1102          * @return String
1103          */
1104         static function makeSpecialUrlSubpage( $name, $subpage, $urlaction = '' ) {
1105                 $title = SpecialPage::getSafeTitleFor( $name, $subpage );
1106                 return $title->getLocalURL( $urlaction );
1107         }
1108
1109         /**
1110          * @param $name string
1111          * @param $urlaction string
1112          * @return String
1113          */
1114         static function makeI18nUrl( $name, $urlaction = '' ) {
1115                 $title = Title::newFromText( wfMessage( $name )->inContentLanguage()->text() );
1116                 self::checkTitle( $title, $name );
1117                 return $title->getLocalURL( $urlaction );
1118         }
1119
1120         /**
1121          * @param $name string
1122          * @param $urlaction string
1123          * @return String
1124          */
1125         static function makeUrl( $name, $urlaction = '' ) {
1126                 $title = Title::newFromText( $name );
1127                 self::checkTitle( $title, $name );
1128
1129                 return $title->getLocalURL( $urlaction );
1130         }
1131
1132         /**
1133          * If url string starts with http, consider as external URL, else
1134          * internal
1135          * @param $name String
1136          * @return String URL
1137          */
1138         static function makeInternalOrExternalUrl( $name ) {
1139                 if ( preg_match( '/^(?i:' . wfUrlProtocols() . ')/', $name ) ) {
1140                         return $name;
1141                 } else {
1142                         return self::makeUrl( $name );
1143                 }
1144         }
1145
1146         /**
1147          * this can be passed the NS number as defined in Language.php
1148          * @param $name
1149          * @param $urlaction string
1150          * @param $namespace int
1151          * @return String
1152          */
1153         static function makeNSUrl( $name, $urlaction = '', $namespace = NS_MAIN ) {
1154                 $title = Title::makeTitleSafe( $namespace, $name );
1155                 self::checkTitle( $title, $name );
1156
1157                 return $title->getLocalURL( $urlaction );
1158         }
1159
1160         /**
1161          * these return an array with the 'href' and boolean 'exists'
1162          * @param $name
1163          * @param $urlaction string
1164          * @return array
1165          */
1166         static function makeUrlDetails( $name, $urlaction = '' ) {
1167                 $title = Title::newFromText( $name );
1168                 self::checkTitle( $title, $name );
1169
1170                 return array(
1171                         'href' => $title->getLocalURL( $urlaction ),
1172                         'exists' => $title->getArticleID() != 0,
1173                 );
1174         }
1175
1176         /**
1177          * Make URL details where the article exists (or at least it's convenient to think so)
1178          * @param string $name Article name
1179          * @param $urlaction String
1180          * @return Array
1181          */
1182         static function makeKnownUrlDetails( $name, $urlaction = '' ) {
1183                 $title = Title::newFromText( $name );
1184                 self::checkTitle( $title, $name );
1185
1186                 return array(
1187                         'href' => $title->getLocalURL( $urlaction ),
1188                         'exists' => true
1189                 );
1190         }
1191
1192         /**
1193          * make sure we have some title to operate on
1194          *
1195          * @param $title Title
1196          * @param $name string
1197          */
1198         static function checkTitle( &$title, $name ) {
1199                 if ( !is_object( $title ) ) {
1200                         $title = Title::newFromText( $name );
1201                         if ( !is_object( $title ) ) {
1202                                 $title = Title::newFromText( '--error: link target missing--' );
1203                         }
1204                 }
1205         }
1206
1207         /**
1208          * Build an array that represents the sidebar(s), the navigation bar among them.
1209          *
1210          * BaseTemplate::getSidebar can be used to simplify the format and id generation in new skins.
1211          *
1212          * The format of the returned array is array( heading => content, ... ), where:
1213          * - heading is the heading of a navigation portlet. It is either:
1214          *   - magic string to be handled by the skins ('SEARCH' / 'LANGUAGES' / 'TOOLBOX' / ...)
1215          *   - a message name (e.g. 'navigation'), the message should be HTML-escaped by the skin
1216          *   - plain text, which should be HTML-escaped by the skin
1217          * - content is the contents of the portlet. It is either:
1218          *   - HTML text (<ul><li>...</li>...</ul>)
1219          *   - array of link data in a format accepted by BaseTemplate::makeListItem()
1220          *   - (for a magic string as a key, any value)
1221          *
1222          * Note that extensions can control the sidebar contents using the SkinBuildSidebar hook
1223          * and can technically insert anything in here; skin creators are expected to handle
1224          * values described above.
1225          *
1226          * @return array
1227          */
1228         function buildSidebar() {
1229                 global $wgMemc, $wgEnableSidebarCache, $wgSidebarCacheExpiry;
1230                 wfProfileIn( __METHOD__ );
1231
1232                 $key = wfMemcKey( 'sidebar', $this->getLanguage()->getCode() );
1233
1234                 if ( $wgEnableSidebarCache ) {
1235                         $cachedsidebar = $wgMemc->get( $key );
1236                         if ( $cachedsidebar ) {
1237                                 wfProfileOut( __METHOD__ );
1238                                 return $cachedsidebar;
1239                         }
1240                 }
1241
1242                 $bar = array();
1243                 $this->addToSidebar( $bar, 'sidebar' );
1244
1245                 wfRunHooks( 'SkinBuildSidebar', array( $this, &$bar ) );
1246                 if ( $wgEnableSidebarCache ) {
1247                         $wgMemc->set( $key, $bar, $wgSidebarCacheExpiry );
1248                 }
1249
1250                 wfProfileOut( __METHOD__ );
1251                 return $bar;
1252         }
1253
1254         /**
1255          * Add content from a sidebar system message
1256          * Currently only used for MediaWiki:Sidebar (but may be used by Extensions)
1257          *
1258          * This is just a wrapper around addToSidebarPlain() for backwards compatibility
1259          *
1260          * @param $bar array
1261          * @param $message String
1262          */
1263         function addToSidebar( &$bar, $message ) {
1264                 $this->addToSidebarPlain( $bar, wfMessage( $message )->inContentLanguage()->plain() );
1265         }
1266
1267         /**
1268          * Add content from plain text
1269          * @since 1.17
1270          * @param $bar array
1271          * @param $text string
1272          * @return Array
1273          */
1274         function addToSidebarPlain( &$bar, $text ) {
1275                 $lines = explode( "\n", $text );
1276
1277                 $heading = '';
1278
1279                 foreach ( $lines as $line ) {
1280                         if ( strpos( $line, '*' ) !== 0 ) {
1281                                 continue;
1282                         }
1283                         $line = rtrim( $line, "\r" ); // for Windows compat
1284
1285                         if ( strpos( $line, '**' ) !== 0 ) {
1286                                 $heading = trim( $line, '* ' );
1287                                 if ( !array_key_exists( $heading, $bar ) ) {
1288                                         $bar[$heading] = array();
1289                                 }
1290                         } else {
1291                                 $line = trim( $line, '* ' );
1292
1293                                 if ( strpos( $line, '|' ) !== false ) { // sanity check
1294                                         $line = MessageCache::singleton()->transform( $line, false, null, $this->getTitle() );
1295                                         $line = array_map( 'trim', explode( '|', $line, 2 ) );
1296                                         if ( count( $line ) !== 2 ) {
1297                                                 // Second sanity check, could be hit by people doing
1298                                                 // funky stuff with parserfuncs... (bug 33321)
1299                                                 continue;
1300                                         }
1301
1302                                         $extraAttribs = array();
1303
1304                                         $msgLink = $this->msg( $line[0] )->inContentLanguage();
1305                                         if ( $msgLink->exists() ) {
1306                                                 $link = $msgLink->text();
1307                                                 if ( $link == '-' ) {
1308                                                         continue;
1309                                                 }
1310                                         } else {
1311                                                 $link = $line[0];
1312                                         }
1313                                         $msgText = $this->msg( $line[1] );
1314                                         if ( $msgText->exists() ) {
1315                                                 $text = $msgText->text();
1316                                         } else {
1317                                                 $text = $line[1];
1318                                         }
1319
1320                                         if ( preg_match( '/^(?i:' . wfUrlProtocols() . ')/', $link ) ) {
1321                                                 $href = $link;
1322
1323                                                 // Parser::getExternalLinkAttribs won't work here because of the Namespace things
1324                                                 global $wgNoFollowLinks, $wgNoFollowDomainExceptions;
1325                                                 if ( $wgNoFollowLinks && !wfMatchesDomainList( $href, $wgNoFollowDomainExceptions ) ) {
1326                                                         $extraAttribs['rel'] = 'nofollow';
1327                                                 }
1328
1329                                                 global $wgExternalLinkTarget;
1330                                                 if ( $wgExternalLinkTarget ) {
1331                                                         $extraAttribs['target'] = $wgExternalLinkTarget;
1332                                                 }
1333                                         } else {
1334                                                 $title = Title::newFromText( $link );
1335
1336                                                 if ( $title ) {
1337                                                         $title = $title->fixSpecialName();
1338                                                         $href = $title->getLinkURL();
1339                                                 } else {
1340                                                         $href = 'INVALID-TITLE';
1341                                                 }
1342                                         }
1343
1344                                         $bar[$heading][] = array_merge( array(
1345                                                 'text' => $text,
1346                                                 'href' => $href,
1347                                                 'id' => 'n-' . Sanitizer::escapeId( strtr( $line[1], ' ', '-' ), 'noninitial' ),
1348                                                 'active' => false
1349                                         ), $extraAttribs );
1350                                 } else {
1351                                         continue;
1352                                 }
1353                         }
1354                 }
1355
1356                 return $bar;
1357         }
1358
1359         /**
1360          * This function previously controlled whether the 'mediawiki.legacy.wikiprintable' module
1361          * should be loaded by OutputPage. That module no longer exists and the return value of this
1362          * method is ignored.
1363          *
1364          * If your skin doesn't provide its own print styles, the 'mediawiki.legacy.commonPrint' module
1365          * can be used instead (SkinTemplate-based skins do it automatically).
1366          *
1367          * @deprecated since 1.22
1368          * @return bool
1369          */
1370         public function commonPrintStylesheet() {
1371                 wfDeprecated( __METHOD__, '1.22' );
1372                 return false;
1373         }
1374
1375         /**
1376          * Gets new talk page messages for the current user and returns an
1377          * appropriate alert message (or an empty string if there are no messages)
1378          * @return String
1379          */
1380         function getNewtalks() {
1381
1382                 $newMessagesAlert = '';
1383                 $user = $this->getUser();
1384                 $newtalks = $user->getNewMessageLinks();
1385                 $out = $this->getOutput();
1386
1387                 // Allow extensions to disable or modify the new messages alert
1388                 if ( !wfRunHooks( 'GetNewMessagesAlert', array( &$newMessagesAlert, $newtalks, $user, $out ) ) ) {
1389                         return '';
1390                 }
1391                 if ( $newMessagesAlert ) {
1392                         return $newMessagesAlert;
1393                 }
1394
1395                 if ( count( $newtalks ) == 1 && $newtalks[0]['wiki'] === wfWikiID() ) {
1396                         $uTalkTitle = $user->getTalkPage();
1397                         $lastSeenRev = isset( $newtalks[0]['rev'] ) ? $newtalks[0]['rev'] : null;
1398                         $nofAuthors = 0;
1399                         if ( $lastSeenRev !== null ) {
1400                                 $plural = true; // Default if we have a last seen revision: if unknown, use plural
1401                                 $latestRev = Revision::newFromTitle( $uTalkTitle, false, Revision::READ_NORMAL );
1402                                 if ( $latestRev !== null ) {
1403                                         // Singular if only 1 unseen revision, plural if several unseen revisions.
1404                                         $plural = $latestRev->getParentId() !== $lastSeenRev->getId();
1405                                         $nofAuthors = $uTalkTitle->countAuthorsBetween(
1406                                                 $lastSeenRev, $latestRev, 10, 'include_new' );
1407                                 }
1408                         } else {
1409                                 // Singular if no revision -> diff link will show latest change only in any case
1410                                 $plural = false;
1411                         }
1412                         $plural = $plural ? 999 : 1;
1413                         // 999 signifies "more than one revision". We don't know how many, and even if we did,
1414                         // the number of revisions or authors is not necessarily the same as the number of
1415                         // "messages".
1416                         $newMessagesLink = Linker::linkKnown(
1417                                 $uTalkTitle,
1418                                 $this->msg( 'newmessageslinkplural' )->params( $plural )->escaped(),
1419                                 array(),
1420                                 array( 'redirect' => 'no' )
1421                         );
1422
1423                         $newMessagesDiffLink = Linker::linkKnown(
1424                                 $uTalkTitle,
1425                                 $this->msg( 'newmessagesdifflinkplural' )->params( $plural )->escaped(),
1426                                 array(),
1427                                 $lastSeenRev !== null
1428                                         ? array( 'oldid' => $lastSeenRev->getId(), 'diff' => 'cur' )
1429                                         : array( 'diff' => 'cur' )
1430                         );
1431
1432                         if ( $nofAuthors >= 1 && $nofAuthors <= 10 ) {
1433                                 $newMessagesAlert = $this->msg(
1434                                         'youhavenewmessagesfromusers',
1435                                         $newMessagesLink,
1436                                         $newMessagesDiffLink
1437                                 )->numParams( $nofAuthors, $plural );
1438                         } else {
1439                                 // $nofAuthors === 11 signifies "11 or more" ("more than 10")
1440                                 $newMessagesAlert = $this->msg(
1441                                         $nofAuthors > 10 ? 'youhavenewmessagesmanyusers' : 'youhavenewmessages',
1442                                         $newMessagesLink,
1443                                         $newMessagesDiffLink
1444                                 )->numParams( $plural );
1445                         }
1446                         $newMessagesAlert = $newMessagesAlert->text();
1447                         # Disable Squid cache
1448                         $out->setSquidMaxage( 0 );
1449                 } elseif ( count( $newtalks ) ) {
1450                         $sep = $this->msg( 'newtalkseparator' )->escaped();
1451                         $msgs = array();
1452
1453                         foreach ( $newtalks as $newtalk ) {
1454                                 $msgs[] = Xml::element(
1455                                         'a',
1456                                         array( 'href' => $newtalk['link'] ), $newtalk['wiki']
1457                                 );
1458                         }
1459                         $parts = implode( $sep, $msgs );
1460                         $newMessagesAlert = $this->msg( 'youhavenewmessagesmulti' )->rawParams( $parts )->escaped();
1461                         $out->setSquidMaxage( 0 );
1462                 }
1463
1464                 return $newMessagesAlert;
1465         }
1466
1467         /**
1468          * Get a cached notice
1469          *
1470          * @param string $name message name, or 'default' for $wgSiteNotice
1471          * @return String: HTML fragment
1472          */
1473         private function getCachedNotice( $name ) {
1474                 global $wgRenderHashAppend, $parserMemc, $wgContLang;
1475
1476                 wfProfileIn( __METHOD__ );
1477
1478                 $needParse = false;
1479
1480                 if ( $name === 'default' ) {
1481                         // special case
1482                         global $wgSiteNotice;
1483                         $notice = $wgSiteNotice;
1484                         if ( empty( $notice ) ) {
1485                                 wfProfileOut( __METHOD__ );
1486                                 return false;
1487                         }
1488                 } else {
1489                         $msg = $this->msg( $name )->inContentLanguage();
1490                         if ( $msg->isDisabled() ) {
1491                                 wfProfileOut( __METHOD__ );
1492                                 return false;
1493                         }
1494                         $notice = $msg->plain();
1495                 }
1496
1497                 // Use the extra hash appender to let eg SSL variants separately cache.
1498                 $key = wfMemcKey( $name . $wgRenderHashAppend );
1499                 $cachedNotice = $parserMemc->get( $key );
1500                 if ( is_array( $cachedNotice ) ) {
1501                         if ( md5( $notice ) == $cachedNotice['hash'] ) {
1502                                 $notice = $cachedNotice['html'];
1503                         } else {
1504                                 $needParse = true;
1505                         }
1506                 } else {
1507                         $needParse = true;
1508                 }
1509
1510                 if ( $needParse ) {
1511                         $parsed = $this->getOutput()->parse( $notice );
1512                         $parserMemc->set( $key, array( 'html' => $parsed, 'hash' => md5( $notice ) ), 600 );
1513                         $notice = $parsed;
1514                 }
1515
1516                 $notice = Html::rawElement( 'div', array( 'id' => 'localNotice',
1517                         'lang' => $wgContLang->getHtmlCode(), 'dir' => $wgContLang->getDir() ), $notice );
1518                 wfProfileOut( __METHOD__ );
1519                 return $notice;
1520         }
1521
1522         /**
1523          * Get a notice based on page's namespace
1524          *
1525          * @return String: HTML fragment
1526          */
1527         function getNamespaceNotice() {
1528                 wfProfileIn( __METHOD__ );
1529
1530                 $key = 'namespacenotice-' . $this->getTitle()->getNsText();
1531                 $namespaceNotice = $this->getCachedNotice( $key );
1532                 if ( $namespaceNotice && substr( $namespaceNotice, 0, 7 ) != '<p>&lt;' ) {
1533                         $namespaceNotice = '<div id="namespacebanner">' . $namespaceNotice . '</div>';
1534                 } else {
1535                         $namespaceNotice = '';
1536                 }
1537
1538                 wfProfileOut( __METHOD__ );
1539                 return $namespaceNotice;
1540         }
1541
1542         /**
1543          * Get the site notice
1544          *
1545          * @return String: HTML fragment
1546          */
1547         function getSiteNotice() {
1548                 wfProfileIn( __METHOD__ );
1549                 $siteNotice = '';
1550
1551                 if ( wfRunHooks( 'SiteNoticeBefore', array( &$siteNotice, $this ) ) ) {
1552                         if ( is_object( $this->getUser() ) && $this->getUser()->isLoggedIn() ) {
1553                                 $siteNotice = $this->getCachedNotice( 'sitenotice' );
1554                         } else {
1555                                 $anonNotice = $this->getCachedNotice( 'anonnotice' );
1556                                 if ( !$anonNotice ) {
1557                                         $siteNotice = $this->getCachedNotice( 'sitenotice' );
1558                                 } else {
1559                                         $siteNotice = $anonNotice;
1560                                 }
1561                         }
1562                         if ( !$siteNotice ) {
1563                                 $siteNotice = $this->getCachedNotice( 'default' );
1564                         }
1565                 }
1566
1567                 wfRunHooks( 'SiteNoticeAfter', array( &$siteNotice, $this ) );
1568                 wfProfileOut( __METHOD__ );
1569                 return $siteNotice;
1570         }
1571
1572         /**
1573          * Create a section edit link.  This supersedes editSectionLink() and
1574          * editSectionLinkForOther().
1575          *
1576          * @param $nt Title  The title being linked to (may not be the same as
1577          *   the current page, if the section is included from a template)
1578          * @param string $section The designation of the section being pointed to,
1579          *   to be included in the link, like "&section=$section"
1580          * @param string $tooltip The tooltip to use for the link: will be escaped
1581          *   and wrapped in the 'editsectionhint' message
1582          * @param $lang string Language code
1583          * @return string HTML to use for edit link
1584          */
1585         public function doEditSectionLink( Title $nt, $section, $tooltip = null, $lang = false ) {
1586                 // HTML generated here should probably have userlangattributes
1587                 // added to it for LTR text on RTL pages
1588
1589                 $lang = wfGetLangObj( $lang );
1590
1591                 $attribs = array();
1592                 if ( !is_null( $tooltip ) ) {
1593                         # Bug 25462: undo double-escaping.
1594                         $tooltip = Sanitizer::decodeCharReferences( $tooltip );
1595                         $attribs['title'] = wfMessage( 'editsectionhint' )->rawParams( $tooltip )
1596                                 ->inLanguage( $lang )->text();
1597                 }
1598                 $link = Linker::link( $nt, wfMessage( 'editsection' )->inLanguage( $lang )->text(),
1599                         $attribs,
1600                         array( 'action' => 'edit', 'section' => $section ),
1601                         array( 'noclasses', 'known' )
1602                 );
1603
1604                 # Add the brackets and the span and run the hook.
1605                 $result = '<span class="mw-editsection">'
1606                         . '<span class="mw-editsection-bracket">[</span>'
1607                         . $link
1608                         . '<span class="mw-editsection-bracket">]</span>'
1609                         . '</span>';
1610
1611                 wfRunHooks( 'DoEditSectionLink', array( $this, $nt, $section, $tooltip, &$result, $lang ) );
1612                 return $result;
1613         }
1614
1615         /**
1616          * Use PHP's magic __call handler to intercept legacy calls to the linker
1617          * for backwards compatibility.
1618          *
1619          * @param string $fname Name of called method
1620          * @param array $args Arguments to the method
1621          * @throws MWException
1622          * @return mixed
1623          */
1624         function __call( $fname, $args ) {
1625                 $realFunction = array( 'Linker', $fname );
1626                 if ( is_callable( $realFunction ) ) {
1627                         wfDeprecated( get_class( $this ) . '::' . $fname, '1.21' );
1628                         return call_user_func_array( $realFunction, $args );
1629                 } else {
1630                         $className = get_class( $this );
1631                         throw new MWException( "Call to undefined method $className::$fname" );
1632                 }
1633         }
1634
1635 }