includes/OutputPage.php

   1 <?php
   2 if ( !defined( 'MEDIAWIKI' ) ) {
   3         die( 1 );
   4 }
   5
   6 /**
   7  * This class should be covered by a general architecture document which does
   8  * not exist as of January 2011.  This is one of the Core classes and should
   9  * be read at least once by any new developers.
  10  *
  11  * This class is used to prepare the final rendering. A skin is then
  12  * applied to the output parameters (links, javascript, html, categories ...).
  13  *
  14  * @todo FIXME: Another class handles sending the whole page to the client.
  15  *
  16  * Some comments comes from a pairing session between Zak Greant and Ashar Voultoiz
  17  * in November 2010.
  18  *
  19  * @todo document
  20  */
  21 class OutputPage extends ContextSource {
  22         /// Should be private. Used with addMeta() which adds <meta>
  23         var $mMetatags = array();
  24
  25         /// <meta keyworkds="stuff"> most of the time the first 10 links to an article
  26         var $mKeywords = array();
  27
  28         var $mLinktags = array();
  29
  30         /// Additional stylesheets. Looks like this is for extensions. Might be replaced by resource loader.
  31         var $mExtStyles = array();
  32
  33         /// Should be private - has getter and setter. Contains the HTML title
  34         var $mPagetitle = '';
  35
  36         /// Contains all of the <body> content. Should be private we got set/get accessors and the append() method.
  37         var $mBodytext = '';
  38
  39         /**
  40          * Holds the debug lines that will be output as comments in page source if
  41          * $wgDebugComments is enabled. See also $wgShowDebug.
  42          * TODO: make a getter method for this
  43          */
  44         public $mDebugtext = ''; // TODO: we might want to replace it by wfDebug() wfDebugLog()
  45
  46         /// Should be private. Stores contents of <title> tag
  47         var $mHTMLtitle = '';
  48
  49         /// Should be private. Is the displayed content related to the source of the corresponding wiki article.
  50         var $mIsarticle = false;
  51
  52         /**
  53          * Should be private. Has get/set methods properly documented.
  54          * Stores "article flag" toggle.
  55          */
  56         var $mIsArticleRelated = true;
  57
  58         /**
  59          * Should be private. We have to set isPrintable(). Some pages should
  60          * never be printed (ex: redirections).
  61          */
  62         var $mPrintable = false;
  63
  64         /**
  65          * Should be private. We have set/get/append methods.
  66          *
  67          * Contains the page subtitle. Special pages usually have some links here.
  68          * Don't confuse with site subtitle added by skins.
  69          */
  70         var $mSubtitle = '';
  71
  72         var $mRedirect = '';
  73         var $mStatusCode;
  74
  75         /**
  76          * mLastModified and mEtag are used for sending cache control.
  77          * The whole caching system should probably be moved into its own class.
  78          */
  79         var $mLastModified = '';
  80
  81         /**
  82          * Should be private. No getter but used in sendCacheControl();
  83          * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
  84          * as a unique identifier for the content. It is later used by the client
  85          * to compare its cached version with the server version. Client sends
  86          * headers If-Match and If-None-Match containing its locally cached ETAG value.
  87          *
  88          * To get more information, you will have to look at HTTP/1.1 protocol which
  89          * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
  90          */
  91         var $mETag = false;
  92
  93         var $mCategoryLinks = array();
  94         var $mCategories = array();
  95
  96         /// Should be private. Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
  97         var $mLanguageLinks = array();
  98
  99         /**
 100          * Should be private. Used for JavaScript (pre resource loader)
 101          * We should split js / css.
 102          * mScripts content is inserted as is in <head> by Skin. This might contains
 103          * either a link to a stylesheet or inline css.
 104          */
 105         var $mScripts = '';
 106
 107         /**
 108          * Inline CSS styles. Use addInlineStyle() sparsingly
 109          */
 110         var $mInlineStyles = '';
 111
 112         //
 113         var $mLinkColours;
 114
 115         /**
 116          * Used by skin template.
 117          * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
 118          */
 119         var $mPageLinkTitle = '';
 120
 121         /// Array of elements in <head>. Parser might add its own headers!
 122         var $mHeadItems = array();
 123
 124         // @todo FIXME: Next variables probably comes from the resource loader
 125         var $mModules = array(), $mModuleScripts = array(), $mModuleStyles = array(), $mModuleMessages = array();
 126         var $mResourceLoader;
 127         var $mJsConfigVars = array();
 128
 129         /** @todo FIXME: Is this still used ?*/
 130         var $mInlineMsg = array();
 131
 132         var $mTemplateIds = array();
 133         var $mImageTimeKeys = array();
 134
 135         var $mRedirectCode = '';
 136
 137         var $mFeedLinksAppendQuery = null;
 138
 139         # What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
 140         # @see ResourceLoaderModule::$origin
 141         # ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
 142         protected $mAllowedModules = array(
 143                 ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
 144         );
 145
 146         /**
 147          * @EasterEgg I just love the name for this self documenting variable.
 148          * @todo document
 149          */
 150         var $mDoNothing = false;
 151
 152         // Parser related.
 153         var $mContainsOldMagic = 0, $mContainsNewMagic = 0;
 154
 155         /// lazy initialised, use parserOptions()
 156         protected $mParserOptions = null;
 157
 158         /**
 159          * Handles the atom / rss links.
 160          * We probably only support atom in 2011.
 161          * Looks like a private variable.
 162          * @see $wgAdvertisedFeedTypes
 163          */
 164         var $mFeedLinks = array();
 165
 166         // Gwicke work on squid caching? Roughly from 2003.
 167         var $mEnableClientCache = true;
 168
 169         /**
 170          * Flag if output should only contain the body of the article.
 171          * Should be private.
 172          */
 173         var $mArticleBodyOnly = false;
 174
 175         var $mNewSectionLink = false;
 176         var $mHideNewSectionLink = false;
 177
 178         /**
 179          * Comes from the parser. This was probably made to load CSS/JS only
 180          * if we had <gallery>. Used directly in CategoryPage.php
 181          * Looks like resource loader can replace this.
 182          */
 183         var $mNoGallery = false;
 184
 185         // should be private.
 186         var $mPageTitleActionText = '';
 187         var $mParseWarnings = array();
 188
 189         // Cache stuff. Looks like mEnableClientCache
 190         var $mSquidMaxage = 0;
 191
 192         // @todo document
 193         var $mPreventClickjacking = true;
 194
 195         /// should be private. To include the variable {{REVISIONID}}
 196         var $mRevisionId = null;
 197
 198         var $mFileVersion = null;
 199
 200         /**
 201          * An array of stylesheet filenames (relative from skins path), with options
 202          * for CSS media, IE conditions, and RTL/LTR direction.
 203          * For internal use; add settings in the skin via $this->addStyle()
 204          *
 205          * Style again! This seems like a code duplication since we already have
 206          * mStyles. This is what makes OpenSource amazing.
 207          */
 208         var $styles = array();
 209
 210         /**
 211          * Whether jQuery is already handled.
 212          */
 213         protected $mJQueryDone = false;
 214
 215         private $mIndexPolicy = 'index';
 216         private $mFollowPolicy = 'follow';
 217         private $mVaryHeader = array(
 218                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 219                 'Cookie' => null
 220         );
 221
 222         /**
 223          * Constructor for OutputPage. This should not be called directly.
 224          * Instead a new RequestContext should be created and it will implicitly create
 225          * a OutputPage tied to that context.
 226          */
 227         function __construct( IContextSource $context = null ) {
 228                 if ( $context === null ) {
 229                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 230                         wfDeprecated( __METHOD__ );
 231                 } else {
 232                         $this->setContext( $context );
 233                 }
 234         }
 235
 236         /**
 237          * Redirect to $url rather than displaying the normal page
 238          *
 239          * @param $url String: URL
 240          * @param $responsecode String: HTTP status code
 241          */
 242         public function redirect( $url, $responsecode = '302' ) {
 243                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 244                 $this->mRedirect = str_replace( "\n", '', $url );
 245                 $this->mRedirectCode = $responsecode;
 246         }
 247
 248         /**
 249          * Get the URL to redirect to, or an empty string if not redirect URL set
 250          *
 251          * @return String
 252          */
 253         public function getRedirect() {
 254                 return $this->mRedirect;
 255         }
 256
 257         /**
 258          * Set the HTTP status code to send with the output.
 259          *
 260          * @param $statusCode Integer
 261          */
 262         public function setStatusCode( $statusCode ) {
 263                 $this->mStatusCode = $statusCode;
 264         }
 265
 266         /**
 267          * Add a new <meta> tag
 268          * To add an http-equiv meta tag, precede the name with "http:"
 269          *
 270          * @param $name String tag name
 271          * @param $val String tag value
 272          */
 273         function addMeta( $name, $val ) {
 274                 array_push( $this->mMetatags, array( $name, $val ) );
 275         }
 276
 277         /**
 278          * Add a keyword or a list of keywords in the page header
 279          *
 280          * @param $text String or array of strings
 281          */
 282         function addKeyword( $text ) {
 283                 if( is_array( $text ) ) {
 284                         $this->mKeywords = array_merge( $this->mKeywords, $text );
 285                 } else {
 286                         array_push( $this->mKeywords, $text );
 287                 }
 288         }
 289
 290         /**
 291          * Add a new \<link\> tag to the page header
 292          *
 293          * @param $linkarr Array: associative array of attributes.
 294          */
 295         function addLink( $linkarr ) {
 296                 array_push( $this->mLinktags, $linkarr );
 297         }
 298
 299         /**
 300          * Add a new \<link\> with "rel" attribute set to "meta"
 301          *
 302          * @param $linkarr Array: associative array mapping attribute names to their
 303          *                 values, both keys and values will be escaped, and the
 304          *                 "rel" attribute will be automatically added
 305          */
 306         function addMetadataLink( $linkarr ) {
 307                 $linkarr['rel'] = $this->getMetadataAttribute();
 308                 $this->addLink( $linkarr );
 309         }
 310
 311         /**
 312          * Get the value of the "rel" attribute for metadata links
 313          *
 314          * @return String
 315          */
 316         public function getMetadataAttribute() {
 317                 # note: buggy CC software only reads first "meta" link
 318                 static $haveMeta = false;
 319                 if ( $haveMeta ) {
 320                         return 'alternate meta';
 321                 } else {
 322                         $haveMeta = true;
 323                         return 'meta';
 324                 }
 325         }
 326
 327         /**
 328          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 329          *
 330          * @param $script String: raw HTML
 331          */
 332         function addScript( $script ) {
 333                 $this->mScripts .= $script . "\n";
 334         }
 335
 336         /**
 337          * Register and add a stylesheet from an extension directory.
 338          *
 339          * @param $url String path to sheet.  Provide either a full url (beginning
 340          *             with 'http', etc) or a relative path from the document root
 341          *             (beginning with '/').  Otherwise it behaves identically to
 342          *             addStyle() and draws from the /skins folder.
 343          */
 344         public function addExtensionStyle( $url ) {
 345                 array_push( $this->mExtStyles, $url );
 346         }
 347
 348         /**
 349          * Get all styles added by extensions
 350          *
 351          * @return Array
 352          */
 353         function getExtStyle() {
 354                 return $this->mExtStyles;
 355         }
 356
 357         /**
 358          * Add a JavaScript file out of skins/common, or a given relative path.
 359          *
 360          * @param $file String: filename in skins/common or complete on-server path
 361          *              (/foo/bar.js)
 362          * @param $version String: style version of the file. Defaults to $wgStyleVersion
 363          */
 364         public function addScriptFile( $file, $version = null ) {
 365                 global $wgStylePath, $wgStyleVersion;
 366                 // See if $file parameter is an absolute URL or begins with a slash
 367                 if( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 368                         $path = $file;
 369                 } else {
 370                         $path = "{$wgStylePath}/common/{$file}";
 371                 }
 372                 if ( is_null( $version ) )
 373                         $version = $wgStyleVersion;
 374                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 375         }
 376
 377         /**
 378          * Add a self-contained script tag with the given contents
 379          *
 380          * @param $script String: JavaScript text, no <script> tags
 381          */
 382         public function addInlineScript( $script ) {
 383                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 384         }
 385
 386         /**
 387          * Get all registered JS and CSS tags for the header.
 388          *
 389          * @return String
 390          */
 391         function getScript() {
 392                 return $this->mScripts . $this->getHeadItems();
 393         }
 394
 395         /**
 396          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 397          * which are no longer registered (eg a page is cached before an extension is disabled)
 398          * @param $modules Array
 399          * @param $position String if not null, only return modules with this position
 400          * @param $type string
 401          * @return Array
 402          */
 403         protected function filterModules( $modules, $position = null, $type = ResourceLoaderModule::TYPE_COMBINED ){
 404                 $resourceLoader = $this->getResourceLoader();
 405                 $filteredModules = array();
 406                 foreach( $modules as $val ){
 407                         $module = $resourceLoader->getModule( $val );
 408                         if( $module instanceof ResourceLoaderModule
 409                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 410                                 && ( is_null( $position ) || $module->getPosition() == $position ) )
 411                         {
 412                                 $filteredModules[] = $val;
 413                         }
 414                 }
 415                 return $filteredModules;
 416         }
 417
 418         /**
 419          * Get the list of modules to include on this page
 420          *
 421          * @param $filter Bool whether to filter out insufficiently trustworthy modules
 422          * @param $position String if not null, only return modules with this position
 423          * @param $param string
 424          * @return Array of module names
 425          */
 426         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 427                 $modules = array_values( array_unique( $this->$param ) );
 428                 return $filter
 429                         ? $this->filterModules( $modules, $position )
 430                         : $modules;
 431         }
 432
 433         /**
 434          * Add one or more modules recognized by the resource loader. Modules added
 435          * through this function will be loaded by the resource loader when the
 436          * page loads.
 437          *
 438          * @param $modules Mixed: module name (string) or array of module names
 439          */
 440         public function addModules( $modules ) {
 441                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 442         }
 443
 444         /**
 445          * Get the list of module JS to include on this page
 446          *
 447          * @param $filter
 448          * @param $position
 449          *
 450          * @return array of module names
 451          */
 452         public function getModuleScripts( $filter = false, $position = null ) {
 453                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 454         }
 455
 456         /**
 457          * Add only JS of one or more modules recognized by the resource loader. Module
 458          * scripts added through this function will be loaded by the resource loader when
 459          * the page loads.
 460          *
 461          * @param $modules Mixed: module name (string) or array of module names
 462          */
 463         public function addModuleScripts( $modules ) {
 464                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 465         }
 466
 467         /**
 468          * Get the list of module CSS to include on this page
 469          *
 470          * @param $filter
 471          * @param $position
 472          *
 473          * @return Array of module names
 474          */
 475         public function getModuleStyles( $filter = false, $position = null ) {
 476                 return $this->getModules( $filter,  $position, 'mModuleStyles' );
 477         }
 478
 479         /**
 480          * Add only CSS of one or more modules recognized by the resource loader. Module
 481          * styles added through this function will be loaded by the resource loader when
 482          * the page loads.
 483          *
 484          * @param $modules Mixed: module name (string) or array of module names
 485          */
 486         public function addModuleStyles( $modules ) {
 487                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 488         }
 489
 490         /**
 491          * Get the list of module messages to include on this page
 492          *
 493          * @param $filter
 494          * @param $position
 495          *
 496          * @return Array of module names
 497          */
 498         public function getModuleMessages( $filter = false, $position = null ) {
 499                 return $this->getModules( $filter, $position, 'mModuleMessages' );
 500         }
 501
 502         /**
 503          * Add only messages of one or more modules recognized by the resource loader.
 504          * Module messages added through this function will be loaded by the resource
 505          * loader when the page loads.
 506          *
 507          * @param $modules Mixed: module name (string) or array of module names
 508          */
 509         public function addModuleMessages( $modules ) {
 510                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 511         }
 512
 513         /**
 514          * Get an array of head items
 515          *
 516          * @return Array
 517          */
 518         function getHeadItemsArray() {
 519                 return $this->mHeadItems;
 520         }
 521
 522         /**
 523          * Get all header items in a string
 524          *
 525          * @return String
 526          */
 527         function getHeadItems() {
 528                 $s = '';
 529                 foreach ( $this->mHeadItems as $item ) {
 530                         $s .= $item;
 531                 }
 532                 return $s;
 533         }
 534
 535         /**
 536          * Add or replace an header item to the output
 537          *
 538          * @param $name String: item name
 539          * @param $value String: raw HTML
 540          */
 541         public function addHeadItem( $name, $value ) {
 542                 $this->mHeadItems[$name] = $value;
 543         }
 544
 545         /**
 546          * Check if the header item $name is already set
 547          *
 548          * @param $name String: item name
 549          * @return Boolean
 550          */
 551         public function hasHeadItem( $name ) {
 552                 return isset( $this->mHeadItems[$name] );
 553         }
 554
 555         /**
 556          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 557          *
 558          * @param $tag String: value of "ETag" header
 559          */
 560         function setETag( $tag ) {
 561                 $this->mETag = $tag;
 562         }
 563
 564         /**
 565          * Set whether the output should only contain the body of the article,
 566          * without any skin, sidebar, etc.
 567          * Used e.g. when calling with "action=render".
 568          *
 569          * @param $only Boolean: whether to output only the body of the article
 570          */
 571         public function setArticleBodyOnly( $only ) {
 572                 $this->mArticleBodyOnly = $only;
 573         }
 574
 575         /**
 576          * Return whether the output will contain only the body of the article
 577          *
 578          * @return Boolean
 579          */
 580         public function getArticleBodyOnly() {
 581                 return $this->mArticleBodyOnly;
 582         }
 583
 584         /**
 585          * checkLastModified tells the client to use the client-cached page if
 586          * possible. If sucessful, the OutputPage is disabled so that
 587          * any future call to OutputPage->output() have no effect.
 588          *
 589          * Side effect: sets mLastModified for Last-Modified header
 590          *
 591          * @param $timestamp string
 592          *
 593          * @return Boolean: true iff cache-ok headers was sent.
 594          */
 595         public function checkLastModified( $timestamp ) {
 596                 global $wgCachePages, $wgCacheEpoch;
 597
 598                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 599                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 600                         return false;
 601                 }
 602                 if( !$wgCachePages ) {
 603                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 604                         return false;
 605                 }
 606                 if( $this->getUser()->getOption( 'nocache' ) ) {
 607                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 608                         return false;
 609                 }
 610
 611                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 612                 $modifiedTimes = array(
 613                         'page' => $timestamp,
 614                         'user' => $this->getUser()->getTouched(),
 615                         'epoch' => $wgCacheEpoch
 616                 );
 617                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 618
 619                 $maxModified = max( $modifiedTimes );
 620                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 621
 622                 if( empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 623                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 624                         return false;
 625                 }
 626
 627                 # Make debug info
 628                 $info = '';
 629                 foreach ( $modifiedTimes as $name => $value ) {
 630                         if ( $info !== '' ) {
 631                                 $info .= ', ';
 632                         }
 633                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 634                 }
 635
 636                 # IE sends sizes after the date like this:
 637                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 638                 # this breaks strtotime().
 639                 $clientHeader = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 640
 641                 wfSuppressWarnings(); // E_STRICT system time bitching
 642                 $clientHeaderTime = strtotime( $clientHeader );
 643                 wfRestoreWarnings();
 644                 if ( !$clientHeaderTime ) {
 645                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 646                         return false;
 647                 }
 648                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 649
 650                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 651                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
 652                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 653                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
 654                 if( $clientHeaderTime < $maxModified ) {
 655                         wfDebug( __METHOD__ . ": STALE, $info\n", false );
 656                         return false;
 657                 }
 658
 659                 # Not modified
 660                 # Give a 304 response code and disable body output
 661                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
 662                 ini_set( 'zlib.output_compression', 0 );
 663                 $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
 664                 $this->sendCacheControl();
 665                 $this->disable();
 666
 667                 // Don't output a compressed blob when using ob_gzhandler;
 668                 // it's technically against HTTP spec and seems to confuse
 669                 // Firefox when the response gets split over two packets.
 670                 wfClearOutputBuffers();
 671
 672                 return true;
 673         }
 674
 675         /**
 676          * Override the last modified timestamp
 677          *
 678          * @param $timestamp String: new timestamp, in a format readable by
 679          *        wfTimestamp()
 680          */
 681         public function setLastModified( $timestamp ) {
 682                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 683         }
 684
 685         /**
 686          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 687          *
 688          * @param $policy String: the literal string to output as the contents of
 689          *   the meta tag.  Will be parsed according to the spec and output in
 690          *   standardized form.
 691          * @return null
 692          */
 693         public function setRobotPolicy( $policy ) {
 694                 $policy = Article::formatRobotPolicy( $policy );
 695
 696                 if( isset( $policy['index'] ) ) {
 697                         $this->setIndexPolicy( $policy['index'] );
 698                 }
 699                 if( isset( $policy['follow'] ) ) {
 700                         $this->setFollowPolicy( $policy['follow'] );
 701                 }
 702         }
 703
 704         /**
 705          * Set the index policy for the page, but leave the follow policy un-
 706          * touched.
 707          *
 708          * @param $policy string Either 'index' or 'noindex'.
 709          * @return null
 710          */
 711         public function setIndexPolicy( $policy ) {
 712                 $policy = trim( $policy );
 713                 if( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 714                         $this->mIndexPolicy = $policy;
 715                 }
 716         }
 717
 718         /**
 719          * Set the follow policy for the page, but leave the index policy un-
 720          * touched.
 721          *
 722          * @param $policy String: either 'follow' or 'nofollow'.
 723          * @return null
 724          */
 725         public function setFollowPolicy( $policy ) {
 726                 $policy = trim( $policy );
 727                 if( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 728                         $this->mFollowPolicy = $policy;
 729                 }
 730         }
 731
 732         /**
 733          * Set the new value of the "action text", this will be added to the
 734          * "HTML title", separated from it with " - ".
 735          *
 736          * @param $text String: new value of the "action text"
 737          */
 738         public function setPageTitleActionText( $text ) {
 739                 $this->mPageTitleActionText = $text;
 740         }
 741
 742         /**
 743          * Get the value of the "action text"
 744          *
 745          * @return String
 746          */
 747         public function getPageTitleActionText() {
 748                 if ( isset( $this->mPageTitleActionText ) ) {
 749                         return $this->mPageTitleActionText;
 750                 }
 751         }
 752
 753         /**
 754          * "HTML title" means the contents of <title>.
 755          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 756          *
 757          * @param $name string
 758          */
 759         public function setHTMLTitle( $name ) {
 760                 $this->mHTMLtitle = $name;
 761         }
 762
 763         /**
 764          * Return the "HTML title", i.e. the content of the <title> tag.
 765          *
 766          * @return String
 767          */
 768         public function getHTMLTitle() {
 769                 return $this->mHTMLtitle;
 770         }
 771
 772         /**
 773          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.
 774          * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.
 775          * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.
 776          * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.
 777          *
 778          * @param $name string
 779          */
 780         public function setPageTitle( $name ) {
 781                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 782                 # but leave "<i>foobar</i>" alone
 783                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 784                 $this->mPagetitle = $nameWithTags;
 785
 786                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 787                 $this->setHTMLTitle( wfMsg( 'pagetitle', Sanitizer::stripAllTags( $nameWithTags ) ) );
 788         }
 789
 790         /**
 791          * Return the "page title", i.e. the content of the \<h1\> tag.
 792          *
 793          * @return String
 794          */
 795         public function getPageTitle() {
 796                 return $this->mPagetitle;
 797         }
 798
 799         /**
 800          * Set the Title object to use
 801          *
 802          * @param $t Title object
 803          */
 804         public function setTitle( Title $t ) {
 805                 $this->getContext()->setTitle( $t );
 806         }
 807
 808
 809         /**
 810          * Replace the subtile with $str
 811          *
 812          * @param $str String: new value of the subtitle
 813          */
 814         public function setSubtitle( $str ) {
 815                 $this->mSubtitle = /*$this->parse(*/ $str /*)*/; // @bug 2514
 816         }
 817
 818         /**
 819          * Add $str to the subtitle
 820          *
 821          * @param $str String to add to the subtitle
 822          */
 823         public function appendSubtitle( $str ) {
 824                 $this->mSubtitle .= /*$this->parse(*/ $str /*)*/; // @bug 2514
 825         }
 826
 827         /**
 828          * Get the subtitle
 829          *
 830          * @return String
 831          */
 832         public function getSubtitle() {
 833                 return $this->mSubtitle;
 834         }
 835
 836         /**
 837          * Set the page as printable, i.e. it'll be displayed with with all
 838          * print styles included
 839          */
 840         public function setPrintable() {
 841                 $this->mPrintable = true;
 842         }
 843
 844         /**
 845          * Return whether the page is "printable"
 846          *
 847          * @return Boolean
 848          */
 849         public function isPrintable() {
 850                 return $this->mPrintable;
 851         }
 852
 853         /**
 854          * Disable output completely, i.e. calling output() will have no effect
 855          */
 856         public function disable() {
 857                 $this->mDoNothing = true;
 858         }
 859
 860         /**
 861          * Return whether the output will be completely disabled
 862          *
 863          * @return Boolean
 864          */
 865         public function isDisabled() {
 866                 return $this->mDoNothing;
 867         }
 868
 869         /**
 870          * Show an "add new section" link?
 871          *
 872          * @return Boolean
 873          */
 874         public function showNewSectionLink() {
 875                 return $this->mNewSectionLink;
 876         }
 877
 878         /**
 879          * Forcibly hide the new section link?
 880          *
 881          * @return Boolean
 882          */
 883         public function forceHideNewSectionLink() {
 884                 return $this->mHideNewSectionLink;
 885         }
 886
 887         /**
 888          * Add or remove feed links in the page header
 889          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 890          * for the new version
 891          * @see addFeedLink()
 892          *
 893          * @param $show Boolean: true: add default feeds, false: remove all feeds
 894          */
 895         public function setSyndicated( $show = true ) {
 896                 if ( $show ) {
 897                         $this->setFeedAppendQuery( false );
 898                 } else {
 899                         $this->mFeedLinks = array();
 900                 }
 901         }
 902
 903         /**
 904          * Add default feeds to the page header
 905          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 906          * for the new version
 907          * @see addFeedLink()
 908          *
 909          * @param $val String: query to append to feed links or false to output
 910          *        default links
 911          */
 912         public function setFeedAppendQuery( $val ) {
 913                 global $wgAdvertisedFeedTypes;
 914
 915                 $this->mFeedLinks = array();
 916
 917                 foreach ( $wgAdvertisedFeedTypes as $type ) {
 918                         $query = "feed=$type";
 919                         if ( is_string( $val ) ) {
 920                                 $query .= '&' . $val;
 921                         }
 922                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
 923                 }
 924         }
 925
 926         /**
 927          * Add a feed link to the page header
 928          *
 929          * @param $format String: feed type, should be a key of $wgFeedClasses
 930          * @param $href String: URL
 931          */
 932         public function addFeedLink( $format, $href ) {
 933                 global $wgAdvertisedFeedTypes;
 934
 935                 if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
 936                         $this->mFeedLinks[$format] = $href;
 937                 }
 938         }
 939
 940         /**
 941          * Should we output feed links for this page?
 942          * @return Boolean
 943          */
 944         public function isSyndicated() {
 945                 return count( $this->mFeedLinks ) > 0;
 946         }
 947
 948         /**
 949          * Return URLs for each supported syndication format for this page.
 950          * @return array associating format keys with URLs
 951          */
 952         public function getSyndicationLinks() {
 953                 return $this->mFeedLinks;
 954         }
 955
 956         /**
 957          * Will currently always return null
 958          *
 959          * @return null
 960          */
 961         public function getFeedAppendQuery() {
 962                 return $this->mFeedLinksAppendQuery;
 963         }
 964
 965         /**
 966          * Set whether the displayed content is related to the source of the
 967          * corresponding article on the wiki
 968          * Setting true will cause the change "article related" toggle to true
 969          *
 970          * @param $v Boolean
 971          */
 972         public function setArticleFlag( $v ) {
 973                 $this->mIsarticle = $v;
 974                 if ( $v ) {
 975                         $this->mIsArticleRelated = $v;
 976                 }
 977         }
 978
 979         /**
 980          * Return whether the content displayed page is related to the source of
 981          * the corresponding article on the wiki
 982          *
 983          * @return Boolean
 984          */
 985         public function isArticle() {
 986                 return $this->mIsarticle;
 987         }
 988
 989         /**
 990          * Set whether this page is related an article on the wiki
 991          * Setting false will cause the change of "article flag" toggle to false
 992          *
 993          * @param $v Boolean
 994          */
 995         public function setArticleRelated( $v ) {
 996                 $this->mIsArticleRelated = $v;
 997                 if ( !$v ) {
 998                         $this->mIsarticle = false;
 999                 }
1000         }
1001
1002         /**
1003          * Return whether this page is related an article on the wiki
1004          *
1005          * @return Boolean
1006          */
1007         public function isArticleRelated() {
1008                 return $this->mIsArticleRelated;
1009         }
1010
1011         /**
1012          * Add new language links
1013          *
1014          * @param $newLinkArray Associative array mapping language code to the page
1015          *                      name
1016          */
1017         public function addLanguageLinks( $newLinkArray ) {
1018                 $this->mLanguageLinks += $newLinkArray;
1019         }
1020
1021         /**
1022          * Reset the language links and add new language links
1023          *
1024          * @param $newLinkArray Associative array mapping language code to the page
1025          *                      name
1026          */
1027         public function setLanguageLinks( $newLinkArray ) {
1028                 $this->mLanguageLinks = $newLinkArray;
1029         }
1030
1031         /**
1032          * Get the list of language links
1033          *
1034          * @return Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1035          */
1036         public function getLanguageLinks() {
1037                 return $this->mLanguageLinks;
1038         }
1039
1040         /**
1041          * Add an array of categories, with names in the keys
1042          *
1043          * @param $categories Array mapping category name => sort key
1044          */
1045         public function addCategoryLinks( $categories ) {
1046                 global $wgContLang;
1047
1048                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1049                         return;
1050                 }
1051
1052                 # Add the links to a LinkBatch
1053                 $arr = array( NS_CATEGORY => $categories );
1054                 $lb = new LinkBatch;
1055                 $lb->setArray( $arr );
1056
1057                 # Fetch existence plus the hiddencat property
1058                 $dbr = wfGetDB( DB_SLAVE );
1059                 $res = $dbr->select( array( 'page', 'page_props' ),
1060                         array( 'page_id', 'page_namespace', 'page_title', 'page_len', 'page_is_redirect', 'page_latest', 'pp_value' ),
1061                         $lb->constructSet( 'page', $dbr ),
1062                         __METHOD__,
1063                         array(),
1064                         array( 'page_props' => array( 'LEFT JOIN', array( 'pp_propname' => 'hiddencat', 'pp_page = page_id' ) ) )
1065                 );
1066
1067                 # Add the results to the link cache
1068                 $lb->addResultToCache( LinkCache::singleton(), $res );
1069
1070                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
1071                 $categories = array_combine(
1072                         array_keys( $categories ),
1073                         array_fill( 0, count( $categories ), 'normal' )
1074                 );
1075
1076                 # Mark hidden categories
1077                 foreach ( $res as $row ) {
1078                         if ( isset( $row->pp_value ) ) {
1079                                 $categories[$row->page_title] = 'hidden';
1080                         }
1081                 }
1082
1083                 # Add the remaining categories to the skin
1084                 if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
1085                         foreach ( $categories as $category => $type ) {
1086                                 $origcategory = $category;
1087                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1088                                 $wgContLang->findVariantLink( $category, $title, true );
1089                                 if ( $category != $origcategory ) {
1090                                         if ( array_key_exists( $category, $categories ) ) {
1091                                                 continue;
1092                                         }
1093                                 }
1094                                 $text = $wgContLang->convertHtml( $title->getText() );
1095                                 $this->mCategories[] = $title->getText();
1096                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1097                         }
1098                 }
1099         }
1100
1101         /**
1102          * Reset the category links (but not the category list) and add $categories
1103          *
1104          * @param $categories Array mapping category name => sort key
1105          */
1106         public function setCategoryLinks( $categories ) {
1107                 $this->mCategoryLinks = array();
1108                 $this->addCategoryLinks( $categories );
1109         }
1110
1111         /**
1112          * Get the list of category links, in a 2-D array with the following format:
1113          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1114          * hidden categories) and $link a HTML fragment with a link to the category
1115          * page
1116          *
1117          * @return Array
1118          */
1119         public function getCategoryLinks() {
1120                 return $this->mCategoryLinks;
1121         }
1122
1123         /**
1124          * Get the list of category names this page belongs to
1125          *
1126          * @return Array of strings
1127          */
1128         public function getCategories() {
1129                 return $this->mCategories;
1130         }
1131
1132         /**
1133          * Do not allow scripts which can be modified by wiki users to load on this page;
1134          * only allow scripts bundled with, or generated by, the software.
1135          */
1136         public function disallowUserJs() {
1137                 $this->reduceAllowedModules(
1138                         ResourceLoaderModule::TYPE_SCRIPTS,
1139                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1140                 );
1141         }
1142
1143         /**
1144          * Return whether user JavaScript is allowed for this page
1145          * @deprecated since 1.18 Load modules with ResourceLoader, and origin and
1146          *     trustworthiness is identified and enforced automagically.
1147          * @return Boolean
1148          */
1149         public function isUserJsAllowed() {
1150                 return $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS ) >= ResourceLoaderModule::ORIGIN_USER_INDIVIDUAL;
1151         }
1152
1153         /**
1154          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1155          * @see ResourceLoaderModule::$origin
1156          * @param $type String ResourceLoaderModule TYPE_ constant
1157          * @return Int ResourceLoaderModule ORIGIN_ class constant
1158          */
1159         public function getAllowedModules( $type ){
1160                 if( $type == ResourceLoaderModule::TYPE_COMBINED ){
1161                         return min( array_values( $this->mAllowedModules ) );
1162                 } else {
1163                         return isset( $this->mAllowedModules[$type] )
1164                                 ? $this->mAllowedModules[$type]
1165                                 : ResourceLoaderModule::ORIGIN_ALL;
1166                 }
1167         }
1168
1169         /**
1170          * Set the highest level of CSS/JS untrustworthiness allowed
1171          * @param  $type String ResourceLoaderModule TYPE_ constant
1172          * @param  $level Int ResourceLoaderModule class constant
1173          */
1174         public function setAllowedModules( $type, $level ){
1175                 $this->mAllowedModules[$type] = $level;
1176         }
1177
1178         /**
1179          * As for setAllowedModules(), but don't inadvertantly make the page more accessible
1180          * @param  $type String
1181          * @param  $level Int ResourceLoaderModule class constant
1182          */
1183         public function reduceAllowedModules( $type, $level ){
1184                 $this->mAllowedModules[$type] = min( $this->getAllowedModules($type), $level );
1185         }
1186
1187         /**
1188          * Prepend $text to the body HTML
1189          *
1190          * @param $text String: HTML
1191          */
1192         public function prependHTML( $text ) {
1193                 $this->mBodytext = $text . $this->mBodytext;
1194         }
1195
1196         /**
1197          * Append $text to the body HTML
1198          *
1199          * @param $text String: HTML
1200          */
1201         public function addHTML( $text ) {
1202                 $this->mBodytext .= $text;
1203         }
1204
1205         /**
1206          * Clear the body HTML
1207          */
1208         public function clearHTML() {
1209                 $this->mBodytext = '';
1210         }
1211
1212         /**
1213          * Get the body HTML
1214          *
1215          * @return String: HTML
1216          */
1217         public function getHTML() {
1218                 return $this->mBodytext;
1219         }
1220
1221         /**
1222          * Add $text to the debug output
1223          *
1224          * @param $text String: debug text
1225          */
1226         public function debug( $text ) {
1227                 $this->mDebugtext .= $text;
1228         }
1229
1230         /**
1231          * Get/set the ParserOptions object to use for wikitext parsing
1232          *
1233          * @param $options either the ParserOption to use or null to only get the
1234          *                 current ParserOption object
1235          * @return ParserOptions object
1236          */
1237         public function parserOptions( $options = null ) {
1238                 if ( !$this->mParserOptions ) {
1239                         $this->mParserOptions = new ParserOptions;
1240                         $this->mParserOptions->setEditSection( false );
1241                 }
1242                 return wfSetVar( $this->mParserOptions, $options );
1243         }
1244
1245         /**
1246          * Set the revision ID which will be seen by the wiki text parser
1247          * for things such as embedded {{REVISIONID}} variable use.
1248          *
1249          * @param $revid Mixed: an positive integer, or null
1250          * @return Mixed: previous value
1251          */
1252         public function setRevisionId( $revid ) {
1253                 $val = is_null( $revid ) ? null : intval( $revid );
1254                 return wfSetVar( $this->mRevisionId, $val );
1255         }
1256
1257         /**
1258          * Get the displayed revision ID
1259          *
1260          * @return Integer
1261          */
1262         public function getRevisionId() {
1263                 return $this->mRevisionId;
1264         }
1265
1266         /**
1267          * Set the displayed file version
1268          *
1269          * @param $file File|false
1270          * @return Mixed: previous value
1271          */
1272         public function setFileVersion( $file ) {
1273                 $val = null;
1274                 if ( $file instanceof File && $file->exists() ) {
1275                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1276                 }
1277                 return wfSetVar( $this->mFileVersion, $val, true );
1278         }
1279
1280         /**
1281          * Get the displayed file version
1282          *
1283          * @return Array|null ('time' => MW timestamp, 'sha1' => sha1)
1284          */
1285         public function getFileVersion() {
1286                 return $this->mFileVersion;
1287         }
1288
1289         /**
1290          * Get the templates used on this page
1291          *
1292          * @return Array (namespace => dbKey => revId)
1293          * @since 1.18
1294          */
1295         public function getTemplateIds() {
1296                 return $this->mTemplateIds;
1297         }
1298
1299         /**
1300          * Get the files used on this page
1301          *
1302          * @return Array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1303          * @since 1.18
1304          */
1305         public function getFileSearchOptions() {
1306                 return $this->mImageTimeKeys;
1307         }
1308
1309         /**
1310          * Convert wikitext to HTML and add it to the buffer
1311          * Default assumes that the current page title will be used.
1312          *
1313          * @param $text String
1314          * @param $linestart Boolean: is this the start of a line?
1315          * @param $interface Boolean: is this text in the user interface language?
1316          */
1317         public function addWikiText( $text, $linestart = true, $interface = true ) {
1318                 $title = $this->getTitle(); // Work arround E_STRICT
1319                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1320         }
1321
1322         /**
1323          * Add wikitext with a custom Title object
1324          *
1325          * @param $text String: wikitext
1326          * @param $title Title object
1327          * @param $linestart Boolean: is this the start of a line?
1328          */
1329         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1330                 $this->addWikiTextTitle( $text, $title, $linestart );
1331         }
1332
1333         /**
1334          * Add wikitext with a custom Title object and tidy enabled.
1335          *
1336          * @param $text String: wikitext
1337          * @param $title Title object
1338          * @param $linestart Boolean: is this the start of a line?
1339          */
1340         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1341                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1342         }
1343
1344         /**
1345          * Add wikitext with tidy enabled
1346          *
1347          * @param $text String: wikitext
1348          * @param $linestart Boolean: is this the start of a line?
1349          */
1350         public function addWikiTextTidy( $text, $linestart = true ) {
1351                 $title = $this->getTitle();
1352                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1353         }
1354
1355         /**
1356          * Add wikitext with a custom Title object
1357          *
1358          * @param $text String: wikitext
1359          * @param $title Title object
1360          * @param $linestart Boolean: is this the start of a line?
1361          * @param $tidy Boolean: whether to use tidy
1362          * @param $interface Boolean: whether it is an interface message
1363          *                                                              (for example disables conversion)
1364          */
1365         public function addWikiTextTitle( $text, &$title, $linestart, $tidy = false, $interface = false ) {
1366                 global $wgParser;
1367
1368                 wfProfileIn( __METHOD__ );
1369
1370                 wfIncrStats( 'pcache_not_possible' );
1371
1372                 $popts = $this->parserOptions();
1373                 $oldTidy = $popts->setTidy( $tidy );
1374                 $popts->setInterfaceMessage( (bool) $interface );
1375
1376                 $parserOutput = $wgParser->parse(
1377                         $text, $title, $popts,
1378                         $linestart, true, $this->mRevisionId
1379                 );
1380
1381                 $popts->setTidy( $oldTidy );
1382
1383                 $this->addParserOutput( $parserOutput );
1384
1385                 wfProfileOut( __METHOD__ );
1386         }
1387
1388         /**
1389          * Add a ParserOutput object, but without Html
1390          *
1391          * @param $parserOutput ParserOutput object
1392          */
1393         public function addParserOutputNoText( &$parserOutput ) {
1394                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1395                 $this->addCategoryLinks( $parserOutput->getCategories() );
1396                 $this->mNewSectionLink = $parserOutput->getNewSection();
1397                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1398
1399                 $this->mParseWarnings = $parserOutput->getWarnings();
1400                 if ( !$parserOutput->isCacheable() ) {
1401                         $this->enableClientCache( false );
1402                 }
1403                 $this->mNoGallery = $parserOutput->getNoGallery();
1404                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1405                 $this->addModules( $parserOutput->getModules() );
1406                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1407                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1408                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1409
1410                 // Template versioning...
1411                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1412                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1413                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1414                         } else {
1415                                 $this->mTemplateIds[$ns] = $dbks;
1416                         }
1417                 }
1418                 // File versioning...
1419                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1420                         $this->mImageTimeKeys[$dbk] = $data;
1421                 }
1422
1423                 // Hooks registered in the object
1424                 global $wgParserOutputHooks;
1425                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1426                         list( $hookName, $data ) = $hookInfo;
1427                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1428                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1429                         }
1430                 }
1431
1432                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1433         }
1434
1435         /**
1436          * Add a ParserOutput object
1437          *
1438          * @param $parserOutput ParserOutput
1439          */
1440         function addParserOutput( &$parserOutput ) {
1441                 $this->addParserOutputNoText( $parserOutput );
1442                 $text = $parserOutput->getText();
1443                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1444                 $this->addHTML( $text );
1445         }
1446
1447
1448         /**
1449          * Add the output of a QuickTemplate to the output buffer
1450          *
1451          * @param $template QuickTemplate
1452          */
1453         public function addTemplate( &$template ) {
1454                 ob_start();
1455                 $template->execute();
1456                 $this->addHTML( ob_get_contents() );
1457                 ob_end_clean();
1458         }
1459
1460         /**
1461          * Parse wikitext and return the HTML.
1462          *
1463          * @param $text String
1464          * @param $linestart Boolean: is this the start of a line?
1465          * @param $interface Boolean: use interface language ($wgLang instead of
1466          *                   $wgContLang) while parsing language sensitive magic
1467          *                   words like GRAMMAR and PLURAL. This also disables
1468          *                                       LanguageConverter.
1469          * @param $language  Language object: target language object, will override
1470          *                   $interface
1471          * @return String: HTML
1472          */
1473         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1474                 global $wgParser;
1475
1476                 if( is_null( $this->getTitle() ) ) {
1477                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1478                 }
1479
1480                 $popts = $this->parserOptions();
1481                 if ( $interface ) {
1482                         $popts->setInterfaceMessage( true );
1483                 }
1484                 if ( $language !== null ) {
1485                         $oldLang = $popts->setTargetLanguage( $language );
1486                 }
1487
1488                 $parserOutput = $wgParser->parse(
1489                         $text, $this->getTitle(), $popts,
1490                         $linestart, true, $this->mRevisionId
1491                 );
1492
1493                 if ( $interface ) {
1494                         $popts->setInterfaceMessage( false );
1495                 }
1496                 if ( $language !== null ) {
1497                         $popts->setTargetLanguage( $oldLang );
1498                 }
1499
1500                 return $parserOutput->getText();
1501         }
1502
1503         /**
1504          * Parse wikitext, strip paragraphs, and return the HTML.
1505          *
1506          * @param $text String
1507          * @param $linestart Boolean: is this the start of a line?
1508          * @param $interface Boolean: use interface language ($wgLang instead of
1509          *                   $wgContLang) while parsing language sensitive magic
1510          *                   words like GRAMMAR and PLURAL
1511          * @return String: HTML
1512          */
1513         public function parseInline( $text, $linestart = true, $interface = false ) {
1514                 $parsed = $this->parse( $text, $linestart, $interface );
1515
1516                 $m = array();
1517                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
1518                         $parsed = $m[1];
1519                 }
1520
1521                 return $parsed;
1522         }
1523
1524         /**
1525          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1526          *
1527          * @param $maxage Integer: maximum cache time on the Squid, in seconds.
1528          */
1529         public function setSquidMaxage( $maxage ) {
1530                 $this->mSquidMaxage = $maxage;
1531         }
1532
1533         /**
1534          * Use enableClientCache(false) to force it to send nocache headers
1535          *
1536          * @param $state bool
1537          *
1538          * @return bool
1539          */
1540         public function enableClientCache( $state ) {
1541                 return wfSetVar( $this->mEnableClientCache, $state );
1542         }
1543
1544         /**
1545          * Get the list of cookies that will influence on the cache
1546          *
1547          * @return Array
1548          */
1549         function getCacheVaryCookies() {
1550                 global $wgCookiePrefix, $wgCacheVaryCookies;
1551                 static $cookies;
1552                 if ( $cookies === null ) {
1553                         $cookies = array_merge(
1554                                 array(
1555                                         "{$wgCookiePrefix}Token",
1556                                         "{$wgCookiePrefix}LoggedOut",
1557                                         session_name()
1558                                 ),
1559                                 $wgCacheVaryCookies
1560                         );
1561                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1562                 }
1563                 return $cookies;
1564         }
1565
1566         /**
1567          * Return whether this page is not cacheable because "useskin" or "uselang"
1568          * URL parameters were passed.
1569          *
1570          * @return Boolean
1571          */
1572         function uncacheableBecauseRequestVars() {
1573                 $request = $this->getRequest();
1574                 return $request->getText( 'useskin', false ) === false
1575                         && $request->getText( 'uselang', false ) === false;
1576         }
1577
1578         /**
1579          * Check if the request has a cache-varying cookie header
1580          * If it does, it's very important that we don't allow public caching
1581          *
1582          * @return Boolean
1583          */
1584         function haveCacheVaryCookies() {
1585                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1586                 if ( $cookieHeader === false ) {
1587                         return false;
1588                 }
1589                 $cvCookies = $this->getCacheVaryCookies();
1590                 foreach ( $cvCookies as $cookieName ) {
1591                         # Check for a simple string match, like the way squid does it
1592                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1593                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1594                                 return true;
1595                         }
1596                 }
1597                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1598                 return false;
1599         }
1600
1601         /**
1602          * Add an HTTP header that will influence on the cache
1603          *
1604          * @param $header String: header name
1605          * @param $option Array|null
1606          * @todo FIXME: Document the $option parameter; it appears to be for
1607          *        X-Vary-Options but what format is acceptable?
1608          */
1609         public function addVaryHeader( $header, $option = null ) {
1610                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1611                         $this->mVaryHeader[$header] = (array)$option;
1612                 } elseif( is_array( $option ) ) {
1613                         if( is_array( $this->mVaryHeader[$header] ) ) {
1614                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1615                         } else {
1616                                 $this->mVaryHeader[$header] = $option;
1617                         }
1618                 }
1619                 $this->mVaryHeader[$header] = array_unique( $this->mVaryHeader[$header] );
1620         }
1621
1622         /**
1623          * Get a complete X-Vary-Options header
1624          *
1625          * @return String
1626          */
1627         public function getXVO() {
1628                 $cvCookies = $this->getCacheVaryCookies();
1629
1630                 $cookiesOption = array();
1631                 foreach ( $cvCookies as $cookieName ) {
1632                         $cookiesOption[] = 'string-contains=' . $cookieName;
1633                 }
1634                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1635
1636                 $headers = array();
1637                 foreach( $this->mVaryHeader as $header => $option ) {
1638                         $newheader = $header;
1639                         if( is_array( $option ) ) {
1640                                 $newheader .= ';' . implode( ';', $option );
1641                         }
1642                         $headers[] = $newheader;
1643                 }
1644                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1645
1646                 return $xvo;
1647         }
1648
1649         /**
1650          * bug 21672: Add Accept-Language to Vary and XVO headers
1651          * if there's no 'variant' parameter existed in GET.
1652          *
1653          * For example:
1654          *   /w/index.php?title=Main_page should always be served; but
1655          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1656          */
1657         function addAcceptLanguage() {
1658                 $lang = $this->getTitle()->getPageLanguage();
1659                 if( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
1660                         $variants = $lang->getVariants();
1661                         $aloption = array();
1662                         foreach ( $variants as $variant ) {
1663                                 if( $variant === $lang->getCode() ) {
1664                                         continue;
1665                                 } else {
1666                                         $aloption[] = 'string-contains=' . $variant;
1667
1668                                         // IE and some other browsers use another form of language code
1669                                         // in their Accept-Language header, like "zh-CN" or "zh-TW".
1670                                         // We should handle these too.
1671                                         $ievariant = explode( '-', $variant );
1672                                         if ( count( $ievariant ) == 2 ) {
1673                                                 $ievariant[1] = strtoupper( $ievariant[1] );
1674                                                 $ievariant = implode( '-', $ievariant );
1675                                                 $aloption[] = 'string-contains=' . $ievariant;
1676                                         }
1677                                 }
1678                         }
1679                         $this->addVaryHeader( 'Accept-Language', $aloption );
1680                 }
1681         }
1682
1683         /**
1684          * Set a flag which will cause an X-Frame-Options header appropriate for
1685          * edit pages to be sent. The header value is controlled by
1686          * $wgEditPageFrameOptions.
1687          *
1688          * This is the default for special pages. If you display a CSRF-protected
1689          * form on an ordinary view page, then you need to call this function.
1690          *
1691          * @param $enable bool
1692          */
1693         public function preventClickjacking( $enable = true ) {
1694                 $this->mPreventClickjacking = $enable;
1695         }
1696
1697         /**
1698          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1699          * This can be called from pages which do not contain any CSRF-protected
1700          * HTML form.
1701          */
1702         public function allowClickjacking() {
1703                 $this->mPreventClickjacking = false;
1704         }
1705
1706         /**
1707          * Get the X-Frame-Options header value (without the name part), or false
1708          * if there isn't one. This is used by Skin to determine whether to enable
1709          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
1710          *
1711          * @return string
1712          */
1713         public function getFrameOptions() {
1714                 global $wgBreakFrames, $wgEditPageFrameOptions;
1715                 if ( $wgBreakFrames ) {
1716                         return 'DENY';
1717                 } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
1718                         return $wgEditPageFrameOptions;
1719                 }
1720         }
1721
1722         /**
1723          * Send cache control HTTP headers
1724          */
1725         public function sendCacheControl() {
1726                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgUseXVO;
1727
1728                 $response = $this->getRequest()->response();
1729                 if ( $wgUseETag && $this->mETag ) {
1730                         $response->header( "ETag: $this->mETag" );
1731                 }
1732
1733                 $this->addAcceptLanguage();
1734
1735                 # don't serve compressed data to clients who can't handle it
1736                 # maintain different caches for logged-in users and non-logged in ones
1737                 $response->header( 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) ) );
1738
1739                 if ( $wgUseXVO ) {
1740                         # Add an X-Vary-Options header for Squid with Wikimedia patches
1741                         $response->header( $this->getXVO() );
1742                 }
1743
1744                 if( !$this->uncacheableBecauseRequestVars() && $this->mEnableClientCache ) {
1745                         if(
1746                                 $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
1747                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
1748                         )
1749                         {
1750                                 if ( $wgUseESI ) {
1751                                         # We'll purge the proxy cache explicitly, but require end user agents
1752                                         # to revalidate against the proxy on each visit.
1753                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
1754                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
1755                                         # start with a shorter timeout for initial testing
1756                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
1757                                         $response->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
1758                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
1759                                 } else {
1760                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
1761                                         # to revalidate against the proxy on each visit.
1762                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
1763                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
1764                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
1765                                         # start with a shorter timeout for initial testing
1766                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
1767                                         $response->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
1768                                 }
1769                         } else {
1770                                 # We do want clients to cache if they can, but they *must* check for updates
1771                                 # on revisiting the page.
1772                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
1773                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1774                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
1775                         }
1776                         if($this->mLastModified) {
1777                                 $response->header( "Last-Modified: {$this->mLastModified}" );
1778                         }
1779                 } else {
1780                         wfDebug( __METHOD__ . ": no caching **\n", false );
1781
1782                         # In general, the absence of a last modified header should be enough to prevent
1783                         # the client from using its cache. We send a few other things just to make sure.
1784                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1785                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1786                         $response->header( 'Pragma: no-cache' );
1787                 }
1788         }
1789
1790         /**
1791          * Get the message associed with the HTTP response code $code
1792          *
1793          * @param $code Integer: status code
1794          * @return String or null: message or null if $code is not in the list of
1795          *         messages
1796          *
1797          * @deprecated since 1.18 Use HttpStatus::getMessage() instead.
1798          */
1799         public static function getStatusMessage( $code ) {
1800                 wfDeprecated( __METHOD__ );
1801                 return HttpStatus::getMessage( $code );
1802         }
1803
1804         /**
1805          * Finally, all the text has been munged and accumulated into
1806          * the object, let's actually output it:
1807          */
1808         public function output() {
1809                 global $wgLanguageCode, $wgDebugRedirects, $wgMimeType, $wgVaryOnXFP;
1810
1811                 if( $this->mDoNothing ) {
1812                         return;
1813                 }
1814
1815                 wfProfileIn( __METHOD__ );
1816
1817                 $response = $this->getRequest()->response();
1818
1819                 if ( $this->mRedirect != '' ) {
1820                         # Standards require redirect URLs to be absolute
1821                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
1822                         if( $this->mRedirectCode == '301' || $this->mRedirectCode == '303' ) {
1823                                 if( !$wgDebugRedirects ) {
1824                                         $message = HttpStatus::getMessage( $this->mRedirectCode );
1825                                         $response->header( "HTTP/1.1 {$this->mRedirectCode} $message" );
1826                                 }
1827                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
1828                         }
1829                         if ( $wgVaryOnXFP ) {
1830                                 $this->addVaryHeader( 'X-Forwarded-Proto' );
1831                         }
1832                         $this->sendCacheControl();
1833
1834                         $response->header( "Content-Type: text/html; charset=utf-8" );
1835                         if( $wgDebugRedirects ) {
1836                                 $url = htmlspecialchars( $this->mRedirect );
1837                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
1838                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
1839                                 print "</body>\n</html>\n";
1840                         } else {
1841                                 $response->header( 'Location: ' . $this->mRedirect );
1842                         }
1843                         wfProfileOut( __METHOD__ );
1844                         return;
1845                 } elseif ( $this->mStatusCode ) {
1846                         $message = HttpStatus::getMessage( $this->mStatusCode );
1847                         if ( $message ) {
1848                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
1849                         }
1850                 }
1851
1852                 # Buffer output; final headers may depend on later processing
1853                 ob_start();
1854
1855                 $response->header( "Content-type: $wgMimeType; charset=UTF-8" );
1856                 $response->header( 'Content-language: ' . $wgLanguageCode );
1857
1858                 // Prevent framing, if requested
1859                 $frameOptions = $this->getFrameOptions();
1860                 if ( $frameOptions ) {
1861                         $response->header( "X-Frame-Options: $frameOptions" );
1862                 }
1863
1864                 if ( $this->mArticleBodyOnly ) {
1865                         $this->out( $this->mBodytext );
1866                 } else {
1867                         $this->addDefaultModules();
1868
1869                         $sk = $this->getSkin();
1870
1871                         // Hook that allows last minute changes to the output page, e.g.
1872                         // adding of CSS or Javascript by extensions.
1873                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
1874
1875                         wfProfileIn( 'Output-skin' );
1876                         $sk->outputPage();
1877                         wfProfileOut( 'Output-skin' );
1878                 }
1879
1880                 $this->sendCacheControl();
1881                 ob_end_flush();
1882                 wfProfileOut( __METHOD__ );
1883         }
1884
1885         /**
1886          * Actually output something with print().
1887          *
1888          * @param $ins String: the string to output
1889          */
1890         public function out( $ins ) {
1891                 print $ins;
1892         }
1893
1894         /**
1895          * Produce a "user is blocked" page.
1896          * @deprecated since 1.18
1897          */
1898         function blockedPage() {
1899                 throw new UserBlockedError( $this->getUser()->mBlock );
1900         }
1901
1902         /**
1903          * Output a standard error page
1904          *
1905          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
1906          * showErrorPage( 'titlemsg', $messageObject );
1907          *
1908          * @param $title String: message key for page title
1909          * @param $msg Mixed: message key (string) for page text, or a Message object
1910          * @param $params Array: message parameters; ignored if $msg is a Message object
1911          */
1912         public function showErrorPage( $title, $msg, $params = array() ) {
1913                 if ( $this->getTitle() ) {
1914                         $this->mDebugtext .= 'Original title: ' . $this->getTitle()->getPrefixedText() . "\n";
1915                 }
1916                 $this->setPageTitle( wfMsg( $title ) );
1917                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
1918                 $this->setRobotPolicy( 'noindex,nofollow' );
1919                 $this->setArticleRelated( false );
1920                 $this->enableClientCache( false );
1921                 $this->mRedirect = '';
1922                 $this->mBodytext = '';
1923
1924                 if ( $msg instanceof Message ){
1925                         $this->addHTML( $msg->parse() );
1926                 } else {
1927                         $this->addWikiMsgArray( $msg, $params );
1928                 }
1929
1930                 $this->returnToMain();
1931         }
1932
1933         /**
1934          * Output a standard permission error page
1935          *
1936          * @param $errors Array: error message keys
1937          * @param $action String: action that was denied or null if unknown
1938          */
1939         public function showPermissionsErrorPage( $errors, $action = null ) {
1940                 $this->mDebugtext .= 'Original title: ' .
1941                 $this->getTitle()->getPrefixedText() . "\n";
1942                 $this->setPageTitle( wfMsg( 'permissionserrors' ) );
1943                 $this->setHTMLTitle( wfMsg( 'permissionserrors' ) );
1944                 $this->setRobotPolicy( 'noindex,nofollow' );
1945                 $this->setArticleRelated( false );
1946                 $this->enableClientCache( false );
1947                 $this->mRedirect = '';
1948                 $this->mBodytext = '';
1949                 $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
1950         }
1951
1952         /**
1953          * Display an error page indicating that a given version of MediaWiki is
1954          * required to use it
1955          *
1956          * @param $version Mixed: the version of MediaWiki needed to use the page
1957          */
1958         public function versionRequired( $version ) {
1959                 $this->setPageTitle( wfMsg( 'versionrequired', $version ) );
1960                 $this->setHTMLTitle( wfMsg( 'versionrequired', $version ) );
1961                 $this->setRobotPolicy( 'noindex,nofollow' );
1962                 $this->setArticleRelated( false );
1963                 $this->mBodytext = '';
1964
1965                 $this->addWikiMsg( 'versionrequiredtext', $version );
1966                 $this->returnToMain();
1967         }
1968
1969         /**
1970          * Display an error page noting that a given permission bit is required.
1971          * @deprecated since 1.18, just throw the exception directly
1972          * @param $permission String: key required
1973          */
1974         public function permissionRequired( $permission ) {
1975                 throw new PermissionsError( $permission );
1976         }
1977
1978         /**
1979          * Produce the stock "please login to use the wiki" page
1980          */
1981         public function loginToUse() {
1982                 if( $this->getUser()->isLoggedIn() ) {
1983                         throw new PermissionsError( 'read' );
1984                 }
1985
1986                 $this->setPageTitle( wfMsg( 'loginreqtitle' ) );
1987                 $this->setHtmlTitle( wfMsg( 'errorpagetitle' ) );
1988                 $this->setRobotPolicy( 'noindex,nofollow' );
1989                 $this->setArticleRelated( false );
1990
1991                 $loginTitle = SpecialPage::getTitleFor( 'Userlogin' );
1992                 $loginLink = Linker::linkKnown(
1993                         $loginTitle,
1994                         wfMsgHtml( 'loginreqlink' ),
1995                         array(),
1996                         array( 'returnto' => $this->getTitle()->getPrefixedText() )
1997                 );
1998                 $this->addHTML( wfMessage( 'loginreqpagetext' )->rawParams( $loginLink )->parse() .
1999                         "\n<!--" . $this->getTitle()->getPrefixedUrl() . '-->' );
2000
2001                 # Don't return to the main page if the user can't read it
2002                 # otherwise we'll end up in a pointless loop
2003                 $mainPage = Title::newMainPage();
2004                 if( $mainPage->userCanRead() ) {
2005                         $this->returnToMain( null, $mainPage );
2006                 }
2007         }
2008
2009         /**
2010          * Format a list of error messages
2011          *
2012          * @param $errors Array of arrays returned by Title::getUserPermissionsErrors
2013          * @param $action String: action that was denied or null if unknown
2014          * @return String: the wikitext error-messages, formatted into a list.
2015          */
2016         public function formatPermissionsErrorMessage( $errors, $action = null ) {
2017                 if ( $action == null ) {
2018                         $text = wfMsgNoTrans( 'permissionserrorstext', count( $errors ) ) . "\n\n";
2019                 } else {
2020                         $action_desc = wfMsgNoTrans( "action-$action" );
2021                         $text = wfMsgNoTrans(
2022                                 'permissionserrorstext-withaction',
2023                                 count( $errors ),
2024                                 $action_desc
2025                         ) . "\n\n";
2026                 }
2027
2028                 if ( count( $errors ) > 1 ) {
2029                         $text .= '<ul class="permissions-errors">' . "\n";
2030
2031                         foreach( $errors as $error ) {
2032                                 $text .= '<li>';
2033                                 $text .= call_user_func_array( 'wfMsgNoTrans', $error );
2034                                 $text .= "</li>\n";
2035                         }
2036                         $text .= '</ul>';
2037                 } else {
2038                         $text .= "<div class=\"permissions-errors\">\n" .
2039                                         call_user_func_array( 'wfMsgNoTrans', reset( $errors ) ) .
2040                                         "\n</div>";
2041                 }
2042
2043                 return $text;
2044         }
2045
2046         /**
2047          * Display a page stating that the Wiki is in read-only mode,
2048          * and optionally show the source of the page that the user
2049          * was trying to edit.  Should only be called (for this
2050          * purpose) after wfReadOnly() has returned true.
2051          *
2052          * For historical reasons, this function is _also_ used to
2053          * show the error message when a user tries to edit a page
2054          * they are not allowed to edit.  (Unless it's because they're
2055          * blocked, then we show blockedPage() instead.)  In this
2056          * case, the second parameter should be set to true and a list
2057          * of reasons supplied as the third parameter.
2058          *
2059          * @todo Needs to be split into multiple functions.
2060          *
2061          * @param $source    String: source code to show (or null).
2062          * @param $protected Boolean: is this a permissions error?
2063          * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().
2064          * @param $action    String: action that was denied or null if unknown
2065          */
2066         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
2067                 $this->setRobotPolicy( 'noindex,nofollow' );
2068                 $this->setArticleRelated( false );
2069
2070                 // If no reason is given, just supply a default "I can't let you do
2071                 // that, Dave" message.  Should only occur if called by legacy code.
2072                 if ( $protected && empty( $reasons ) ) {
2073                         $reasons[] = array( 'badaccess-group0' );
2074                 }
2075
2076                 if ( !empty( $reasons ) ) {
2077                         // Permissions error
2078                         if( $source ) {
2079                                 $this->setPageTitle( wfMsg( 'viewsource' ) );
2080                                 $this->setSubtitle(
2081                                         wfMsg( 'viewsourcefor', Linker::linkKnown( $this->getTitle() ) )
2082                                 );
2083                         } else {
2084                                 $this->setPageTitle( wfMsg( 'badaccess' ) );
2085                         }
2086                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2087                 } else {
2088                         // Wiki is read only
2089                         throw new ReadOnlyError;
2090                 }
2091
2092                 // Show source, if supplied
2093                 if( is_string( $source ) ) {
2094                         $this->addWikiMsg( 'viewsourcetext' );
2095
2096                         $pageLang = $this->getTitle()->getPageLanguage();
2097                         $params = array(
2098                                 'id'   => 'wpTextbox1',
2099                                 'name' => 'wpTextbox1',
2100                                 'cols' => $this->getUser()->getOption( 'cols' ),
2101                                 'rows' => $this->getUser()->getOption( 'rows' ),
2102                                 'readonly' => 'readonly',
2103                                 'lang' => $pageLang->getCode(),
2104                                 'dir' => $pageLang->getDir(),
2105                         );
2106                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2107
2108                         // Show templates used by this article
2109                         $article = new Article( $this->getTitle() );
2110                         $templates = Linker::formatTemplates( $article->getUsedTemplates() );
2111                         $this->addHTML( "<div class='templatesUsed'>
2112 $templates
2113 </div>
2114 " );
2115                 }
2116
2117                 # If the title doesn't exist, it's fairly pointless to print a return
2118                 # link to it.  After all, you just tried editing it and couldn't, so
2119                 # what's there to do there?
2120                 if( $this->getTitle()->exists() ) {
2121                         $this->returnToMain( null, $this->getTitle() );
2122                 }
2123         }
2124
2125         /**
2126          * Turn off regular page output and return an error reponse
2127          * for when rate limiting has triggered.
2128          */
2129         public function rateLimited() {
2130                 throw new ThrottledError;
2131         }
2132
2133         /**
2134          * Show a warning about slave lag
2135          *
2136          * If the lag is higher than $wgSlaveLagCritical seconds,
2137          * then the warning is a bit more obvious. If the lag is
2138          * lower than $wgSlaveLagWarning, then no warning is shown.
2139          *
2140          * @param $lag Integer: slave lag
2141          */
2142         public function showLagWarning( $lag ) {
2143                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
2144                 if( $lag >= $wgSlaveLagWarning ) {
2145                         $message = $lag < $wgSlaveLagCritical
2146                                 ? 'lag-warn-normal'
2147                                 : 'lag-warn-high';
2148                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2149                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getContext()->getLang()->formatNum( $lag ) ) );
2150                 }
2151         }
2152
2153         public function showFatalError( $message ) {
2154                 $this->setPageTitle( wfMsg( 'internalerror' ) );
2155                 $this->setRobotPolicy( 'noindex,nofollow' );
2156                 $this->setArticleRelated( false );
2157                 $this->enableClientCache( false );
2158                 $this->mRedirect = '';
2159                 $this->mBodytext = $message;
2160         }
2161
2162         public function showUnexpectedValueError( $name, $val ) {
2163                 $this->showFatalError( wfMsg( 'unexpected', $name, $val ) );
2164         }
2165
2166         public function showFileCopyError( $old, $new ) {
2167                 $this->showFatalError( wfMsg( 'filecopyerror', $old, $new ) );
2168         }
2169
2170         public function showFileRenameError( $old, $new ) {
2171                 $this->showFatalError( wfMsg( 'filerenameerror', $old, $new ) );
2172         }
2173
2174         public function showFileDeleteError( $name ) {
2175                 $this->showFatalError( wfMsg( 'filedeleteerror', $name ) );
2176         }
2177
2178         public function showFileNotFoundError( $name ) {
2179                 $this->showFatalError( wfMsg( 'filenotfound', $name ) );
2180         }
2181
2182         /**
2183          * Add a "return to" link pointing to a specified title
2184          *
2185          * @param $title Title to link
2186          * @param $query String query string
2187          * @param $text String text of the link (input is not escaped)
2188          */
2189         public function addReturnTo( $title, $query = array(), $text = null ) {
2190                 $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullURL() ) );
2191                 $link = wfMsgHtml(
2192                         'returnto',
2193                         Linker::link( $title, $text, array(), $query )
2194                 );
2195                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2196         }
2197
2198         /**
2199          * Add a "return to" link pointing to a specified title,
2200          * or the title indicated in the request, or else the main page
2201          *
2202          * @param $unused No longer used
2203          * @param $returnto Title or String to return to
2204          * @param $returntoquery String: query string for the return to link
2205          */
2206         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2207                 if ( $returnto == null ) {
2208                         $returnto = $this->getRequest()->getText( 'returnto' );
2209                 }
2210
2211                 if ( $returntoquery == null ) {
2212                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2213                 }
2214
2215                 if ( $returnto === '' ) {
2216                         $returnto = Title::newMainPage();
2217                 }
2218
2219                 if ( is_object( $returnto ) ) {
2220                         $titleObj = $returnto;
2221                 } else {
2222                         $titleObj = Title::newFromText( $returnto );
2223                 }
2224                 if ( !is_object( $titleObj ) ) {
2225                         $titleObj = Title::newMainPage();
2226                 }
2227
2228                 $this->addReturnTo( $titleObj, $returntoquery );
2229         }
2230
2231         /**
2232          * @param $sk Skin The given Skin
2233          * @param $includeStyle Boolean: unused
2234          * @return String: The doctype, opening <html>, and head element.
2235          */
2236         public function headElement( Skin $sk, $includeStyle = true ) {
2237                 global $wgContLang, $wgUseTrackbacks;
2238                 $userdir = $this->getLang()->getDir();
2239                 $sitedir = $wgContLang->getDir();
2240
2241                 if ( $sk->commonPrintStylesheet() ) {
2242                         $this->addModuleStyles( 'mediawiki.legacy.wikiprintable' );
2243                 }
2244
2245                 $ret = Html::htmlHeader( array( 'lang' => $this->getLang()->getCode(), 'dir' => $userdir, 'class' => 'client-nojs' ) );
2246
2247                 if ( $this->getHTMLTitle() == '' ) {
2248                         $this->setHTMLTitle( wfMsg( 'pagetitle', $this->getPageTitle() ) );
2249                 }
2250
2251                 $openHead = Html::openElement( 'head' );
2252                 if ( $openHead ) {
2253                         # Don't bother with the newline if $head == ''
2254                         $ret .= "$openHead\n";
2255                 }
2256
2257                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2258
2259                 $ret .= implode( "\n", array(
2260                         $this->getHeadLinks( null, true ),
2261                         $this->buildCssLinks(),
2262                         $this->getHeadScripts(),
2263                         $this->getHeadItems()
2264                 ) );
2265
2266                 if ( $wgUseTrackbacks && $this->isArticleRelated() ) {
2267                         $ret .= $this->getTitle()->trackbackRDF();
2268                 }
2269
2270                 $closeHead = Html::closeElement( 'head' );
2271                 if ( $closeHead ) {
2272                         $ret .= "$closeHead\n";
2273                 }
2274
2275                 $bodyAttrs = array();
2276
2277                 # Classes for LTR/RTL directionality support
2278                 $bodyAttrs['class'] = "mediawiki $userdir sitedir-$sitedir";
2279
2280                 if ( $this->getContext()->getLang()->capitalizeAllNouns() ) {
2281                         # A <body> class is probably not the best way to do this . . .
2282                         $bodyAttrs['class'] .= ' capitalize-all-nouns';
2283                 }
2284                 $bodyAttrs['class'] .= ' ' . $sk->getPageClasses( $this->getTitle() );
2285                 $bodyAttrs['class'] .= ' skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2286
2287                 $sk->addToBodyAttributes( $this, $bodyAttrs ); // Allow skins to add body attributes they need
2288                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2289
2290                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2291
2292                 return $ret;
2293         }
2294
2295         /**
2296          * Add the default ResourceLoader modules to this object
2297          */
2298         private function addDefaultModules() {
2299                 global $wgIncludeLegacyJavaScript, $wgUseAjax, $wgAjaxWatch, $wgEnableMWSuggest;
2300
2301                 // Add base resources
2302                 $this->addModules( array(
2303                         'mediawiki.user',
2304                         'mediawiki.util',
2305                         'mediawiki.page.startup',
2306                         'mediawiki.page.ready',
2307                 ) );
2308                 if ( $wgIncludeLegacyJavaScript ){
2309                         $this->addModules( 'mediawiki.legacy.wikibits' );
2310                 }
2311
2312                 // Add various resources if required
2313                 if ( $wgUseAjax ) {
2314                         $this->addModules( 'mediawiki.legacy.ajax' );
2315
2316                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
2317
2318                         if( $wgAjaxWatch && $this->getUser()->isLoggedIn() ) {
2319                                 $this->addModules( 'mediawiki.action.watch.ajax' );
2320                         }
2321
2322                         if ( $wgEnableMWSuggest && !$this->getUser()->getOption( 'disablesuggest', false ) ) {
2323                                 $this->addModules( 'mediawiki.legacy.mwsuggest' );
2324                         }
2325                 }
2326
2327                 if ( $this->getUser()->getBoolOption( 'editsectiononrightclick' ) ) {
2328                         $this->addModules( 'mediawiki.action.view.rightClickEdit' );
2329                 }
2330
2331                 # Crazy edit-on-double-click stuff
2332                 if ( $this->isArticle() && $this->getUser()->getOption( 'editondblclick' ) ) {
2333                         $this->addModules( 'mediawiki.action.view.dblClickEdit' );
2334                 }
2335         }
2336
2337         /**
2338          * Get a ResourceLoader object associated with this OutputPage
2339          *
2340          * @return ResourceLoader
2341          */
2342         public function getResourceLoader() {
2343                 if ( is_null( $this->mResourceLoader ) ) {
2344                         $this->mResourceLoader = new ResourceLoader();
2345                 }
2346                 return $this->mResourceLoader;
2347         }
2348
2349         /**
2350          * TODO: Document
2351          * @param $modules Array/string with the module name(s)
2352          * @param $only String ResourceLoaderModule TYPE_ class constant
2353          * @param $useESI boolean
2354          * @param $extraQuery Array with extra query parameters to add to each request. array( param => value )
2355          * @return string html <script> and <style> tags
2356          */
2357         protected function makeResourceLoaderLink( $modules, $only, $useESI = false, array $extraQuery = array() ) {
2358                 global $wgLoadScript, $wgResourceLoaderUseESI,
2359                         $wgResourceLoaderInlinePrivateModules;
2360
2361                 if ( !count( $modules ) ) {
2362                         return '';
2363                 }
2364
2365                 if ( count( $modules ) > 1 ) {
2366                         // Remove duplicate module requests
2367                         $modules = array_unique( (array) $modules );
2368                         // Sort module names so requests are more uniform
2369                         sort( $modules );
2370
2371                         if ( ResourceLoader::inDebugMode() ) {
2372                                 // Recursively call us for every item
2373                                 $links = '';
2374                                 foreach ( $modules as $name ) {
2375                                         $links .= $this->makeResourceLoaderLink( $name, $only, $useESI );
2376                                 }
2377                                 return $links;
2378                         }
2379                 }
2380
2381                 // Create keyed-by-group list of module objects from modules list
2382                 $groups = array();
2383                 $resourceLoader = $this->getResourceLoader();
2384                 foreach ( (array) $modules as $name ) {
2385                         $module = $resourceLoader->getModule( $name );
2386                         # Check that we're allowed to include this module on this page
2387                         if ( ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2388                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2389                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2390                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2391                                 )
2392                         {
2393                                 continue;
2394                         }
2395
2396                         $group = $module->getGroup();
2397                         if ( !isset( $groups[$group] ) ) {
2398                                 $groups[$group] = array();
2399                         }
2400                         $groups[$group][$name] = $module;
2401                 }
2402
2403                 $links = '';
2404                 foreach ( $groups as $group => $modules ) {
2405                         // Special handling for user-specific groups
2406                         $user = null;
2407                         if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2408                                 $user = $this->getUser()->getName();
2409                         }
2410
2411                         // Create a fake request based on the one we are about to make so modules return
2412                         // correct timestamp and emptiness data
2413                         $query = ResourceLoader::makeLoaderQuery(
2414                                 array(), // modules; not determined yet
2415                                 $this->getContext()->getLang()->getCode(),
2416                                 $this->getSkin()->getSkinName(),
2417                                 $user,
2418                                 null, // version; not determined yet
2419                                 ResourceLoader::inDebugMode(),
2420                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2421                                 $this->isPrintable(),
2422                                 $this->getRequest()->getBool( 'handheld' ),
2423                                 $extraQuery
2424                         );
2425                         $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2426                         // Drop modules that know they're empty
2427                         foreach ( $modules as $key => $module ) {
2428                                 if ( $module->isKnownEmpty( $context ) ) {
2429                                         unset( $modules[$key] );
2430                                 }
2431                         }
2432                         // If there are no modules left, skip this group
2433                         if ( $modules === array() ) {
2434                                 continue;
2435                         }
2436
2437                         // Support inlining of private modules if configured as such
2438                         if ( $group === 'private' && $wgResourceLoaderInlinePrivateModules ) {
2439                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2440                                         $links .= Html::inlineStyle(
2441                                                 $resourceLoader->makeModuleResponse( $context, $modules )
2442                                         );
2443                                 } else {
2444                                         $links .= Html::inlineScript(
2445                                                 ResourceLoader::makeLoaderConditionalScript(
2446                                                         $resourceLoader->makeModuleResponse( $context, $modules )
2447                                                 )
2448                                         );
2449                                 }
2450                                 $links .= "\n";
2451                                 continue;
2452                         }
2453                         // Special handling for the user group; because users might change their stuff
2454                         // on-wiki like user pages, or user preferences; we need to find the highest
2455                         // timestamp of these user-changable modules so we can ensure cache misses on change
2456                         // This should NOT be done for the site group (bug 27564) because anons get that too
2457                         // and we shouldn't be putting timestamps in Squid-cached HTML
2458                         $version = null;
2459                         if ( $group === 'user' ) {
2460                                 // Get the maximum timestamp
2461                                 $timestamp = 1;
2462                                 foreach ( $modules as $module ) {
2463                                         $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2464                                 }
2465                                 // Add a version parameter so cache will break when things change
2466                                 $version = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2467                         }
2468
2469                         $url = ResourceLoader::makeLoaderURL(
2470                                 array_keys( $modules ),
2471                                 $this->getContext()->getLang()->getCode(),
2472                                 $this->getSkin()->getSkinName(),
2473                                 $user,
2474                                 $version,
2475                                 ResourceLoader::inDebugMode(),
2476                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2477                                 $this->isPrintable(),
2478                                 $this->getRequest()->getBool( 'handheld' ),
2479                                 $extraQuery
2480                         );
2481                         if ( $useESI && $wgResourceLoaderUseESI ) {
2482                                 $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2483                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2484                                         $link = Html::inlineStyle( $esi );
2485                                 } else {
2486                                         $link = Html::inlineScript( $esi );
2487                                 }
2488                         } else {
2489                                 // Automatically select style/script elements
2490                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2491                                         $link = Html::linkedStyle( $url );
2492                                 } else {
2493                                         $link = Html::linkedScript( $url );
2494                                 }
2495                         }
2496
2497                         if( $group == 'noscript' ){
2498                                 $links .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2499                         } else {
2500                                 $links .= $link . "\n";
2501                         }
2502                 }
2503                 return $links;
2504         }
2505
2506         /**
2507          * JS stuff to put in the <head>. This is the startup module, config
2508          * vars and modules marked with position 'top'
2509          *
2510          * @return String: HTML fragment
2511          */
2512         function getHeadScripts() {
2513                 // Startup - this will immediately load jquery and mediawiki modules
2514                 $scripts = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2515
2516                 // Load config before anything else
2517                 $scripts .= Html::inlineScript(
2518                         ResourceLoader::makeLoaderConditionalScript(
2519                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2520                         )
2521                 );
2522
2523                 // Script and Messages "only" requests marked for top inclusion
2524                 // Messages should go first
2525                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'top' ), ResourceLoaderModule::TYPE_MESSAGES );
2526                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'top' ), ResourceLoaderModule::TYPE_SCRIPTS );
2527
2528                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2529                 // Only load modules that have marked themselves for loading at the top
2530                 $modules = $this->getModules( true, 'top' );
2531                 if ( $modules ) {
2532                         $scripts .= Html::inlineScript(
2533                                 ResourceLoader::makeLoaderConditionalScript(
2534                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2535                                 )
2536                         );
2537                 }
2538
2539                 return $scripts;
2540         }
2541
2542         /**
2543          * JS stuff to put at the bottom of the <body>: modules marked with position 'bottom',
2544          * legacy scripts ($this->mScripts), user preferences, site JS and user JS
2545          *
2546          * @return string
2547          */
2548         function getBottomScripts() {
2549                 global $wgUseSiteJs, $wgAllowUserJs;
2550
2551                 // Script and Messages "only" requests marked for bottom inclusion
2552                 // Messages should go first
2553                 $scripts = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ), ResourceLoaderModule::TYPE_MESSAGES );
2554                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ), ResourceLoaderModule::TYPE_SCRIPTS );
2555
2556                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2557                 // Only load modules that have marked themselves for loading at the bottom
2558                 $modules = $this->getModules( true, 'bottom' );
2559                 if ( $modules ) {
2560                         $scripts .= Html::inlineScript(
2561                                 ResourceLoader::makeLoaderConditionalScript(
2562                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2563                                 )
2564                         );
2565                 }
2566
2567                 // Legacy Scripts
2568                 $scripts .= "\n" . $this->mScripts;
2569
2570                 $userScripts = array( 'user.options', 'user.tokens' );
2571
2572                 // Add site JS if enabled
2573                 if ( $wgUseSiteJs ) {
2574                         $scripts .= $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS );
2575                         if( $this->getUser()->isLoggedIn() ){
2576                                 $userScripts[] = 'user.groups';
2577                         }
2578                 }
2579
2580                 // Add user JS if enabled
2581                 if ( $wgAllowUserJs && $this->getUser()->isLoggedIn() ) {
2582                         if( $this->getTitle() && $this->getTitle()->isJsSubpage() && $this->userCanPreview() ) {
2583                                 # XXX: additional security check/prompt?
2584                                 // We're on a preview of a JS subpage
2585                                 // Exclude this page from the user module in case it's in there (bug 26283)
2586                                 $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS, false,
2587                                         array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
2588                                 );
2589                                 // Load the previewed JS
2590                                 $scripts .= Html::inlineScript( "\n" . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
2591                         } else {
2592                                 // Include the user module normally
2593                                 // We can't do $userScripts[] = 'user'; because the user module would end up
2594                                 // being wrapped in a closure, so load it raw like 'site'
2595                                 $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS );
2596                         }
2597                 }
2598                 $scripts .= $this->makeResourceLoaderLink( $userScripts, ResourceLoaderModule::TYPE_COMBINED );
2599
2600                 return $scripts;
2601         }
2602
2603         /**
2604          * Add one or more variables to be set in mw.config in JavaScript.
2605          *
2606          * @param $key {String|Array} Key or array of key/value pars.
2607          * @param $value {Mixed} Value of the configuration variable.
2608          */
2609         public function addJsConfigVars( $keys, $value ) {
2610                 if ( is_array( $keys ) ) {
2611                         foreach ( $keys as $key => $value ) {
2612                                 $this->mJsConfigVars[$key] = $value;
2613                         }
2614                         return;
2615                 }
2616
2617                 $this->mJsConfigVars[$keys] = $value;
2618         }
2619
2620
2621         /**
2622          * Get an array containing the variables to be set in mw.config in JavaScript.
2623          *
2624          * Do not add things here which can be evaluated in ResourceLoaderStartupScript
2625          * - in other words, page-independent/site-wide variables (without state).
2626          * You will only be adding bloat to the html page and causing page caches to
2627          * have to be purged on configuration changes.
2628          */
2629         protected function getJSVars() {
2630                 global $wgUseAjax, $wgEnableMWSuggest;
2631
2632                 $title = $this->getTitle();
2633                 $ns = $title->getNamespace();
2634                 $nsname = MWNamespace::exists( $ns ) ? MWNamespace::getCanonicalName( $ns ) : $title->getNsText();
2635                 if ( $ns == NS_SPECIAL ) {
2636                         list( $canonicalName, /*...*/ ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
2637                 } else {
2638                         $canonicalName = false; # bug 21115
2639                 }
2640
2641                 $vars = array(
2642                         'wgCanonicalNamespace' => $nsname,
2643                         'wgCanonicalSpecialPageName' => $canonicalName,
2644                         'wgNamespaceNumber' => $title->getNamespace(),
2645                         'wgPageName' => $title->getPrefixedDBKey(),
2646                         'wgTitle' => $title->getText(),
2647                         'wgCurRevisionId' => $title->getLatestRevID(),
2648                         'wgArticleId' => $title->getArticleId(),
2649                         'wgIsArticle' => $this->isArticle(),
2650                         'wgAction' => $this->getRequest()->getText( 'action', 'view' ),
2651                         'wgUserName' => $this->getUser()->isAnon() ? null : $this->getUser()->getName(),
2652                         'wgUserGroups' => $this->getUser()->getEffectiveGroups(),
2653                         'wgCategories' => $this->getCategories(),
2654                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
2655                 );
2656                 $lang = $this->getTitle()->getPageLanguage();
2657                 if ( $lang->hasVariants() ) {
2658                         $vars['wgUserVariant'] = $lang->getPreferredVariant();
2659                 }
2660                 foreach ( $title->getRestrictionTypes() as $type ) {
2661                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
2662                 }
2663                 if ( $wgUseAjax && $wgEnableMWSuggest && !$this->getUser()->getOption( 'disablesuggest', false ) ) {
2664                         $vars['wgSearchNamespaces'] = SearchEngine::userNamespaces( $this->getUser() );
2665                 }
2666                 if ( $title->isMainPage() ) {
2667                         $vars['wgIsMainPage'] = true;
2668                 }
2669
2670                 // Allow extensions to add their custom variables to the mw.config map.
2671                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
2672                 // page-dependant but site-wide (without state).
2673                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
2674                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars, &$this ) );
2675
2676                 // Merge in variables from addJsConfigVars last
2677                 return array_merge( $vars, $this->mJsConfigVars );
2678         }
2679
2680         /**
2681          * To make it harder for someone to slip a user a fake
2682          * user-JavaScript or user-CSS preview, a random token
2683          * is associated with the login session. If it's not
2684          * passed back with the preview request, we won't render
2685          * the code.
2686          *
2687          * @return bool
2688          */
2689         public function userCanPreview() {
2690                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
2691                         || !$this->getRequest()->wasPosted()
2692                         || !$this->getUser()->matchEditToken(
2693                                 $this->getRequest()->getVal( 'wpEditToken' ) )
2694                 ) {
2695                         return false;
2696                 }
2697                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
2698                         return false;
2699                 }
2700
2701                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
2702         }
2703
2704         /**
2705          * @param $unused Unused
2706          * @param $addContentType bool
2707          *
2708          * @return string HTML tag links to be put in the header.
2709          */
2710         public function getHeadLinks( $unused = null, $addContentType = false ) {
2711                 global $wgUniversalEditButton, $wgFavicon, $wgAppleTouchIcon, $wgEnableAPI,
2712                         $wgSitename, $wgVersion, $wgHtml5, $wgMimeType,
2713                         $wgFeed, $wgOverrideSiteFeed, $wgAdvertisedFeedTypes,
2714                         $wgDisableLangConversion, $wgCanonicalLanguageLinks,
2715                         $wgRightsPage, $wgRightsUrl;
2716
2717                 $tags = array();
2718
2719                 if ( $addContentType ) {
2720                         if ( $wgHtml5 ) {
2721                                 # More succinct than <meta http-equiv=Content-Type>, has the
2722                                 # same effect
2723                                 $tags[] = Html::element( 'meta', array( 'charset' => 'UTF-8' ) );
2724                         } else {
2725                                 $tags[] = Html::element( 'meta', array(
2726                                         'http-equiv' => 'Content-Type',
2727                                         'content' => "$wgMimeType; charset=UTF-8"
2728                                 ) );
2729                                 $tags[] = Html::element( 'meta', array(  // bug 15835
2730                                         'http-equiv' => 'Content-Style-Type',
2731                                         'content' => 'text/css'
2732                                 ) );
2733                         }
2734                 }
2735
2736                 $tags[] = Html::element( 'meta', array(
2737                         'name' => 'generator',
2738                         'content' => "MediaWiki $wgVersion",
2739                 ) );
2740
2741                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
2742                 if( $p !== 'index,follow' ) {
2743                         // http://www.robotstxt.org/wc/meta-user.html
2744                         // Only show if it's different from the default robots policy
2745                         $tags[] = Html::element( 'meta', array(
2746                                 'name' => 'robots',
2747                                 'content' => $p,
2748                         ) );
2749                 }
2750
2751                 if ( count( $this->mKeywords ) > 0 ) {
2752                         $strip = array(
2753                                 "/<.*?" . ">/" => '',
2754                                 "/_/" => ' '
2755                         );
2756                         $tags[] = Html::element( 'meta', array(
2757                                 'name' => 'keywords',
2758                                 'content' =>  preg_replace(
2759                                         array_keys( $strip ),
2760                                         array_values( $strip ),
2761                                         implode( ',', $this->mKeywords )
2762                                 )
2763                         ) );
2764                 }
2765
2766                 foreach ( $this->mMetatags as $tag ) {
2767                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
2768                                 $a = 'http-equiv';
2769                                 $tag[0] = substr( $tag[0], 5 );
2770                         } else {
2771                                 $a = 'name';
2772                         }
2773                         $tags[] = Html::element( 'meta',
2774                                 array(
2775                                         $a => $tag[0],
2776                                         'content' => $tag[1]
2777                                 )
2778                         );
2779                 }
2780
2781                 foreach ( $this->mLinktags as $tag ) {
2782                         $tags[] = Html::element( 'link', $tag );
2783                 }
2784
2785                 # Universal edit button
2786                 if ( $wgUniversalEditButton ) {
2787                         if ( $this->isArticleRelated() && $this->getTitle() && $this->getTitle()->quickUserCan( 'edit' )
2788                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create' ) ) ) {
2789                                 // Original UniversalEditButton
2790                                 $msg = wfMsg( 'edit' );
2791                                 $tags[] = Html::element( 'link', array(
2792                                         'rel' => 'alternate',
2793                                         'type' => 'application/x-wiki',
2794                                         'title' => $msg,
2795                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
2796                                 ) );
2797                                 // Alternate edit link
2798                                 $tags[] = Html::element( 'link', array(
2799                                         'rel' => 'edit',
2800                                         'title' => $msg,
2801                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
2802                                 ) );
2803                         }
2804                 }
2805
2806                 # Generally the order of the favicon and apple-touch-icon links
2807                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
2808                 # uses whichever one appears later in the HTML source. Make sure
2809                 # apple-touch-icon is specified first to avoid this.
2810                 if ( $wgAppleTouchIcon !== false ) {
2811                         $tags[] = Html::element( 'link', array( 'rel' => 'apple-touch-icon', 'href' => $wgAppleTouchIcon ) );
2812                 }
2813
2814                 if ( $wgFavicon !== false ) {
2815                         $tags[] = Html::element( 'link', array( 'rel' => 'shortcut icon', 'href' => $wgFavicon ) );
2816                 }
2817
2818                 # OpenSearch description link
2819                 $tags[] = Html::element( 'link', array(
2820                         'rel' => 'search',
2821                         'type' => 'application/opensearchdescription+xml',
2822                         'href' => wfScript( 'opensearch_desc' ),
2823                         'title' => wfMsgForContent( 'opensearch-desc' ),
2824                 ) );
2825
2826                 if ( $wgEnableAPI ) {
2827                         # Real Simple Discovery link, provides auto-discovery information
2828                         # for the MediaWiki API (and potentially additional custom API
2829                         # support such as WordPress or Twitter-compatible APIs for a
2830                         # blogging extension, etc)
2831                         $tags[] = Html::element( 'link', array(
2832                                 'rel' => 'EditURI',
2833                                 'type' => 'application/rsd+xml',
2834                                 // Output a protocol-relative URL here if $wgServer is protocol-relative
2835                                 // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
2836                                 'href' => wfExpandUrl( wfAppendQuery( wfScript( 'api' ), array( 'action' => 'rsd' ) ), PROTO_RELATIVE ),
2837                         ) );
2838                 }
2839
2840                 $lang = $this->getTitle()->getPageLanguage();
2841
2842                 # Language variants
2843                 if ( !$wgDisableLangConversion && $wgCanonicalLanguageLinks
2844                         && $lang->hasVariants() ) {
2845
2846                         $urlvar = $lang->getURLVariant();
2847
2848                         if ( !$urlvar ) {
2849                                 $variants = $lang->getVariants();
2850                                 foreach ( $variants as $_v ) {
2851                                         $tags[] = Html::element( 'link', array(
2852                                                 'rel' => 'alternate',
2853                                                 'hreflang' => $_v,
2854                                                 'href' => $this->getTitle()->getLocalURL( '', $_v ) )
2855                                         );
2856                                 }
2857                         } else {
2858                                 $tags[] = Html::element( 'link', array(
2859                                         'rel' => 'canonical',
2860                                         'href' => $this->getTitle()->getCanonicalUrl()
2861                                 ) );
2862                         }
2863                 }
2864
2865                 # Copyright
2866                 $copyright = '';
2867                 if ( $wgRightsPage ) {
2868                         $copy = Title::newFromText( $wgRightsPage );
2869
2870                         if ( $copy ) {
2871                                 $copyright = $copy->getLocalURL();
2872                         }
2873                 }
2874
2875                 if ( !$copyright && $wgRightsUrl ) {
2876                         $copyright = $wgRightsUrl;
2877                 }
2878
2879                 if ( $copyright ) {
2880                         $tags[] = Html::element( 'link', array(
2881                                 'rel' => 'copyright',
2882                                 'href' => $copyright )
2883                         );
2884                 }
2885
2886                 # Feeds
2887                 if ( $wgFeed ) {
2888                         foreach( $this->getSyndicationLinks() as $format => $link ) {
2889                                 # Use the page name for the title.  In principle, this could
2890                                 # lead to issues with having the same name for different feeds
2891                                 # corresponding to the same page, but we can't avoid that at
2892                                 # this low a level.
2893
2894                                 $tags[] = $this->feedLink(
2895                                         $format,
2896                                         $link,
2897                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
2898                                         wfMsg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )
2899                                 );
2900                         }
2901
2902                         # Recent changes feed should appear on every page (except recentchanges,
2903                         # that would be redundant). Put it after the per-page feed to avoid
2904                         # changing existing behavior. It's still available, probably via a
2905                         # menu in your browser. Some sites might have a different feed they'd
2906                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
2907                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
2908                         # If so, use it instead.
2909
2910                         $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
2911
2912                         if ( $wgOverrideSiteFeed ) {
2913                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
2914                                         // Note, this->feedLink escapes the url.
2915                                         $tags[] = $this->feedLink(
2916                                                 $type,
2917                                                 $feedUrl,
2918                                                 wfMsg( "site-{$type}-feed", $wgSitename )
2919                                         );
2920                                 }
2921                         } elseif ( $this->getTitle()->getPrefixedText() != $rctitle->getPrefixedText() ) {
2922                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
2923                                         $tags[] = $this->feedLink(
2924                                                 $format,
2925                                                 $rctitle->getLocalURL( "feed={$format}" ),
2926                                                 wfMsg( "site-{$format}-feed", $wgSitename ) # For grep: 'site-rss-feed', 'site-atom-feed'.
2927                                         );
2928                                 }
2929                         }
2930                 }
2931                 return implode( "\n", $tags );
2932         }
2933
2934         /**
2935          * Generate a <link rel/> for a feed.
2936          *
2937          * @param $type String: feed type
2938          * @param $url String: URL to the feed
2939          * @param $text String: value of the "title" attribute
2940          * @return String: HTML fragment
2941          */
2942         private function feedLink( $type, $url, $text ) {
2943                 return Html::element( 'link', array(
2944                         'rel' => 'alternate',
2945                         'type' => "application/$type+xml",
2946                         'title' => $text,
2947                         'href' => $url )
2948                 );
2949         }
2950
2951         /**
2952          * Add a local or specified stylesheet, with the given media options.
2953          * Meant primarily for internal use...
2954          *
2955          * @param $style String: URL to the file
2956          * @param $media String: to specify a media type, 'screen', 'printable', 'handheld' or any.
2957          * @param $condition String: for IE conditional comments, specifying an IE version
2958          * @param $dir String: set to 'rtl' or 'ltr' for direction-specific sheets
2959          */
2960         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
2961                 $options = array();
2962                 // Even though we expect the media type to be lowercase, but here we
2963                 // force it to lowercase to be safe.
2964                 if( $media ) {
2965                         $options['media'] = $media;
2966                 }
2967                 if( $condition ) {
2968                         $options['condition'] = $condition;
2969                 }
2970                 if( $dir ) {
2971                         $options['dir'] = $dir;
2972                 }
2973                 $this->styles[$style] = $options;
2974         }
2975
2976         /**
2977          * Adds inline CSS styles
2978          * @param $style_css Mixed: inline CSS
2979          * @param $flip String: Set to 'flip' to flip the CSS if needed
2980          */
2981         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
2982                 if( $flip === 'flip' && $this->getLang()->isRTL() ) {
2983                         # If wanted, and the interface is right-to-left, flip the CSS
2984                         $style_css = CSSJanus::transform( $style_css, true, false );
2985                 }
2986                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
2987         }
2988
2989         /**
2990          * Build a set of <link>s for the stylesheets specified in the $this->styles array.
2991          * These will be applied to various media & IE conditionals.
2992          *
2993          * @return string
2994          */
2995         public function buildCssLinks() {
2996                 global $wgUseSiteCss, $wgAllowUserCss, $wgAllowUserCssPrefs;
2997
2998                 $this->getSkin()->setupSkinUserCss( $this );
2999
3000                 // Add ResourceLoader styles
3001                 // Split the styles into four groups
3002                 $styles = array( 'other' => array(), 'user' => array(), 'site' => array(), 'private' => array(), 'noscript' => array() );
3003                 $otherTags = ''; // Tags to append after the normal <link> tags
3004                 $resourceLoader = $this->getResourceLoader();
3005
3006                 $moduleStyles = $this->getModuleStyles();
3007
3008                 // Per-site custom styles
3009                 if ( $wgUseSiteCss ) {
3010                         $moduleStyles[] = 'site';
3011                         $moduleStyles[] = 'noscript';
3012                         if( $this->getUser()->isLoggedIn() ){
3013                                 $moduleStyles[] = 'user.groups';
3014                         }
3015                 }
3016
3017                 // Per-user custom styles
3018                 if ( $wgAllowUserCss ) {
3019                         if ( $this->getTitle()->isCssSubpage() && $this->userCanPreview() ) {
3020                                 // We're on a preview of a CSS subpage
3021                                 // Exclude this page from the user module in case it's in there (bug 26283)
3022                                 $otherTags .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES, false,
3023                                         array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3024                                 );
3025                                 // Load the previewed CSS
3026                                 $otherTags .= Html::inlineStyle( $this->getRequest()->getText( 'wpTextbox1' ) );
3027                         } else {
3028                                 // Load the user styles normally
3029                                 $moduleStyles[] = 'user';
3030                         }
3031                 }
3032
3033                 // Per-user preference styles
3034                 if ( $wgAllowUserCssPrefs ) {
3035                         $moduleStyles[] = 'user.options';
3036                 }
3037
3038                 foreach ( $moduleStyles as $name ) {
3039                         $group = $resourceLoader->getModule( $name )->getGroup();
3040                         // Modules in groups named "other" or anything different than "user", "site" or "private"
3041                         // will be placed in the "other" group
3042                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3043                 }
3044
3045                 // We want site, private and user styles to override dynamically added styles from modules, but we want
3046                 // dynamically added styles to override statically added styles from other modules. So the order
3047                 // has to be other, dynamic, site, private, user
3048                 // Add statically added styles for other modules
3049                 $ret = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3050                 // Add normal styles added through addStyle()/addInlineStyle() here
3051                 $ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3052                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3053                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3054                 $ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) ) . "\n";
3055
3056                 // Add site, private and user styles
3057                 // 'private' at present only contains user.options, so put that before 'user'
3058                 // Any future private modules will likely have a similar user-specific character
3059                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3060                         $ret .= $this->makeResourceLoaderLink( $styles[$group],
3061                                         ResourceLoaderModule::TYPE_STYLES
3062                         );
3063                 }
3064
3065                 // Add stuff in $otherTags (previewed user CSS if applicable)
3066                 $ret .= $otherTags;
3067                 return $ret;
3068         }
3069
3070         /**
3071          * @return Array
3072          */
3073         public function buildCssLinksArray() {
3074                 $links = array();
3075
3076                 // Add any extension CSS
3077                 foreach ( $this->mExtStyles as $url ) {
3078                         $this->addStyle( $url );
3079                 }
3080                 $this->mExtStyles = array();
3081
3082                 foreach( $this->styles as $file => $options ) {
3083                         $link = $this->styleLink( $file, $options );
3084                         if( $link ) {
3085                                 $links[$file] = $link;
3086                         }
3087                 }
3088                 return $links;
3089         }
3090
3091         /**
3092          * Generate \<link\> tags for stylesheets
3093          *
3094          * @param $style String: URL to the file
3095          * @param $options Array: option, can contain 'condition', 'dir', 'media'
3096          *                 keys
3097          * @return String: HTML fragment
3098          */
3099         protected function styleLink( $style, $options ) {
3100                 if( isset( $options['dir'] ) ) {
3101                         if( $this->getLang()->getDir() != $options['dir'] ) {
3102                                 return '';
3103                         }
3104                 }
3105
3106                 if( isset( $options['media'] ) ) {
3107                         $media = self::transformCssMedia( $options['media'] );
3108                         if( is_null( $media ) ) {
3109                                 return '';
3110                         }
3111                 } else {
3112                         $media = 'all';
3113                 }
3114
3115                 if( substr( $style, 0, 1 ) == '/' ||
3116                         substr( $style, 0, 5 ) == 'http:' ||
3117                         substr( $style, 0, 6 ) == 'https:' ) {
3118                         $url = $style;
3119                 } else {
3120                         global $wgStylePath, $wgStyleVersion;
3121                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
3122                 }
3123
3124                 $link = Html::linkedStyle( $url, $media );
3125
3126                 if( isset( $options['condition'] ) ) {
3127                         $condition = htmlspecialchars( $options['condition'] );
3128                         $link = "<!--[if $condition]>$link<![endif]-->";
3129                 }
3130                 return $link;
3131         }
3132
3133         /**
3134          * Transform "media" attribute based on request parameters
3135          *
3136          * @param $media String: current value of the "media" attribute
3137          * @return String: modified value of the "media" attribute
3138          */
3139         public static function transformCssMedia( $media ) {
3140                 global $wgRequest, $wgHandheldForIPhone;
3141
3142                 // Switch in on-screen display for media testing
3143                 $switches = array(
3144                         'printable' => 'print',
3145                         'handheld' => 'handheld',
3146                 );
3147                 foreach( $switches as $switch => $targetMedia ) {
3148                         if( $wgRequest->getBool( $switch ) ) {
3149                                 if( $media == $targetMedia ) {
3150                                         $media = '';
3151                                 } elseif( $media == 'screen' ) {
3152                                         return null;
3153                                 }
3154                         }
3155                 }
3156
3157                 // Expand longer media queries as iPhone doesn't grok 'handheld'
3158                 if( $wgHandheldForIPhone ) {
3159                         $mediaAliases = array(
3160                                 'screen' => 'screen and (min-device-width: 481px)',
3161                                 'handheld' => 'handheld, only screen and (max-device-width: 480px)',
3162                         );
3163
3164                         if( isset( $mediaAliases[$media] ) ) {
3165                                 $media = $mediaAliases[$media];
3166                         }
3167                 }
3168
3169                 return $media;
3170         }
3171
3172         /**
3173          * Add a wikitext-formatted message to the output.
3174          * This is equivalent to:
3175          *
3176          *    $wgOut->addWikiText( wfMsgNoTrans( ... ) )
3177          */
3178         public function addWikiMsg( /*...*/ ) {
3179                 $args = func_get_args();
3180                 $name = array_shift( $args );
3181                 $this->addWikiMsgArray( $name, $args );
3182         }
3183
3184         /**
3185          * Add a wikitext-formatted message to the output.
3186          * Like addWikiMsg() except the parameters are taken as an array
3187          * instead of a variable argument list.
3188          *
3189          * $options is passed through to wfMsgExt(), see that function for details.
3190          *
3191          * @param $name string
3192          * @param $args array
3193          * @param $options array
3194          */
3195         public function addWikiMsgArray( $name, $args, $options = array() ) {
3196                 $options[] = 'parse';
3197                 $text = wfMsgExt( $name, $options, $args );
3198                 $this->addHTML( $text );
3199         }
3200
3201         /**
3202          * This function takes a number of message/argument specifications, wraps them in
3203          * some overall structure, and then parses the result and adds it to the output.
3204          *
3205          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3206          * on. The subsequent arguments may either be strings, in which case they are the
3207          * message names, or arrays, in which case the first element is the message name,
3208          * and subsequent elements are the parameters to that message.
3209          *
3210          * The special named parameter 'options' in a message specification array is passed
3211          * through to the $options parameter of wfMsgExt().
3212          *
3213          * Don't use this for messages that are not in users interface language.
3214          *
3215          * For example:
3216          *
3217          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3218          *
3219          * Is equivalent to:
3220          *
3221          *    $wgOut->addWikiText( "<div class='error'>\n" . wfMsgNoTrans( 'some-error' ) . "\n</div>" );
3222          *
3223          * The newline after opening div is needed in some wikitext. See bug 19226.
3224          *
3225          * @param $wrap string
3226          */
3227         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3228                 $msgSpecs = func_get_args();
3229                 array_shift( $msgSpecs );
3230                 $msgSpecs = array_values( $msgSpecs );
3231                 $s = $wrap;
3232                 foreach ( $msgSpecs as $n => $spec ) {
3233                         $options = array();
3234                         if ( is_array( $spec ) ) {
3235                                 $args = $spec;
3236                                 $name = array_shift( $args );
3237                                 if ( isset( $args['options'] ) ) {
3238                                         $options = $args['options'];
3239                                         unset( $args['options'] );
3240                                 }
3241                         }  else {
3242                                 $args = array();
3243                                 $name = $spec;
3244                         }
3245                         $s = str_replace( '$' . ( $n + 1 ), wfMsgExt( $name, $options, $args ), $s );
3246                 }
3247                 $this->addWikiText( $s );
3248         }
3249
3250         /**
3251          * Include jQuery core. Use this to avoid loading it multiple times
3252          * before we get a usable script loader.
3253          *
3254          * @param $modules Array: list of jQuery modules which should be loaded
3255          * @return Array: the list of modules which were not loaded.
3256          * @since 1.16
3257          * @deprecated since 1.17
3258          */
3259         public function includeJQuery( $modules = array() ) {
3260                 return array();
3261         }
3262
3263 }