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