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 Antoine Musso
  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         /**
 156          * lazy initialised, use parserOptions()
 157          * @var ParserOptions
 158          */
 159         protected $mParserOptions = null;
 160
 161         /**
 162          * Handles the atom / rss links.
 163          * We probably only support atom in 2011.
 164          * Looks like a private variable.
 165          * @see $wgAdvertisedFeedTypes
 166          */
 167         var $mFeedLinks = array();
 168
 169         // Gwicke work on squid caching? Roughly from 2003.
 170         var $mEnableClientCache = true;
 171
 172         /**
 173          * Flag if output should only contain the body of the article.
 174          * Should be private.
 175          */
 176         var $mArticleBodyOnly = false;
 177
 178         var $mNewSectionLink = false;
 179         var $mHideNewSectionLink = false;
 180
 181         /**
 182          * Comes from the parser. This was probably made to load CSS/JS only
 183          * if we had <gallery>. Used directly in CategoryPage.php
 184          * Looks like resource loader can replace this.
 185          */
 186         var $mNoGallery = false;
 187
 188         // should be private.
 189         var $mPageTitleActionText = '';
 190         var $mParseWarnings = array();
 191
 192         // Cache stuff. Looks like mEnableClientCache
 193         var $mSquidMaxage = 0;
 194
 195         // @todo document
 196         var $mPreventClickjacking = true;
 197
 198         /// should be private. To include the variable {{REVISIONID}}
 199         var $mRevisionId = null;
 200
 201         var $mFileVersion = null;
 202
 203         /**
 204          * An array of stylesheet filenames (relative from skins path), with options
 205          * for CSS media, IE conditions, and RTL/LTR direction.
 206          * For internal use; add settings in the skin via $this->addStyle()
 207          *
 208          * Style again! This seems like a code duplication since we already have
 209          * mStyles. This is what makes OpenSource amazing.
 210          */
 211         var $styles = array();
 212
 213         /**
 214          * Whether jQuery is already handled.
 215          */
 216         protected $mJQueryDone = false;
 217
 218         private $mIndexPolicy = 'index';
 219         private $mFollowPolicy = 'follow';
 220         private $mVaryHeader = array(
 221                 'Accept-Encoding' => array( 'list-contains=gzip' ),
 222                 'Cookie' => null
 223         );
 224
 225         /**
 226          * Constructor for OutputPage. This should not be called directly.
 227          * Instead a new RequestContext should be created and it will implicitly create
 228          * a OutputPage tied to that context.
 229          */
 230         function __construct( IContextSource $context = null ) {
 231                 if ( $context === null ) {
 232                         # Extensions should use `new RequestContext` instead of `new OutputPage` now.
 233                         wfDeprecated( __METHOD__ );
 234                 } else {
 235                         $this->setContext( $context );
 236                 }
 237         }
 238
 239         /**
 240          * Redirect to $url rather than displaying the normal page
 241          *
 242          * @param $url String: URL
 243          * @param $responsecode String: HTTP status code
 244          */
 245         public function redirect( $url, $responsecode = '302' ) {
 246                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
 247                 $this->mRedirect = str_replace( "\n", '', $url );
 248                 $this->mRedirectCode = $responsecode;
 249         }
 250
 251         /**
 252          * Get the URL to redirect to, or an empty string if not redirect URL set
 253          *
 254          * @return String
 255          */
 256         public function getRedirect() {
 257                 return $this->mRedirect;
 258         }
 259
 260         /**
 261          * Set the HTTP status code to send with the output.
 262          *
 263          * @param $statusCode Integer
 264          */
 265         public function setStatusCode( $statusCode ) {
 266                 $this->mStatusCode = $statusCode;
 267         }
 268
 269         /**
 270          * Add a new <meta> tag
 271          * To add an http-equiv meta tag, precede the name with "http:"
 272          *
 273          * @param $name String tag name
 274          * @param $val String tag value
 275          */
 276         function addMeta( $name, $val ) {
 277                 array_push( $this->mMetatags, array( $name, $val ) );
 278         }
 279
 280         /**
 281          * Add a keyword or a list of keywords in the page header
 282          *
 283          * @param $text String or array of strings
 284          */
 285         function addKeyword( $text ) {
 286                 if( is_array( $text ) ) {
 287                         $this->mKeywords = array_merge( $this->mKeywords, $text );
 288                 } else {
 289                         array_push( $this->mKeywords, $text );
 290                 }
 291         }
 292
 293         /**
 294          * Add a new \<link\> tag to the page header
 295          *
 296          * @param $linkarr Array: associative array of attributes.
 297          */
 298         function addLink( $linkarr ) {
 299                 array_push( $this->mLinktags, $linkarr );
 300         }
 301
 302         /**
 303          * Add a new \<link\> with "rel" attribute set to "meta"
 304          *
 305          * @param $linkarr Array: associative array mapping attribute names to their
 306          *                 values, both keys and values will be escaped, and the
 307          *                 "rel" attribute will be automatically added
 308          */
 309         function addMetadataLink( $linkarr ) {
 310                 $linkarr['rel'] = $this->getMetadataAttribute();
 311                 $this->addLink( $linkarr );
 312         }
 313
 314         /**
 315          * Get the value of the "rel" attribute for metadata links
 316          *
 317          * @return String
 318          */
 319         public function getMetadataAttribute() {
 320                 # note: buggy CC software only reads first "meta" link
 321                 static $haveMeta = false;
 322                 if ( $haveMeta ) {
 323                         return 'alternate meta';
 324                 } else {
 325                         $haveMeta = true;
 326                         return 'meta';
 327                 }
 328         }
 329
 330         /**
 331          * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
 332          *
 333          * @param $script String: raw HTML
 334          */
 335         function addScript( $script ) {
 336                 $this->mScripts .= $script . "\n";
 337         }
 338
 339         /**
 340          * Register and add a stylesheet from an extension directory.
 341          *
 342          * @param $url String path to sheet.  Provide either a full url (beginning
 343          *             with 'http', etc) or a relative path from the document root
 344          *             (beginning with '/').  Otherwise it behaves identically to
 345          *             addStyle() and draws from the /skins folder.
 346          */
 347         public function addExtensionStyle( $url ) {
 348                 array_push( $this->mExtStyles, $url );
 349         }
 350
 351         /**
 352          * Get all styles added by extensions
 353          *
 354          * @return Array
 355          */
 356         function getExtStyle() {
 357                 return $this->mExtStyles;
 358         }
 359
 360         /**
 361          * Add a JavaScript file out of skins/common, or a given relative path.
 362          *
 363          * @param $file String: filename in skins/common or complete on-server path
 364          *              (/foo/bar.js)
 365          * @param $version String: style version of the file. Defaults to $wgStyleVersion
 366          */
 367         public function addScriptFile( $file, $version = null ) {
 368                 global $wgStylePath, $wgStyleVersion;
 369                 // See if $file parameter is an absolute URL or begins with a slash
 370                 if( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
 371                         $path = $file;
 372                 } else {
 373                         $path = "{$wgStylePath}/common/{$file}";
 374                 }
 375                 if ( is_null( $version ) )
 376                         $version = $wgStyleVersion;
 377                 $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
 378         }
 379
 380         /**
 381          * Add a self-contained script tag with the given contents
 382          *
 383          * @param $script String: JavaScript text, no <script> tags
 384          */
 385         public function addInlineScript( $script ) {
 386                 $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
 387         }
 388
 389         /**
 390          * Get all registered JS and CSS tags for the header.
 391          *
 392          * @return String
 393          */
 394         function getScript() {
 395                 return $this->mScripts . $this->getHeadItems();
 396         }
 397
 398         /**
 399          * Filter an array of modules to remove insufficiently trustworthy members, and modules
 400          * which are no longer registered (eg a page is cached before an extension is disabled)
 401          * @param $modules Array
 402          * @param $position String if not null, only return modules with this position
 403          * @param $type string
 404          * @return Array
 405          */
 406         protected function filterModules( $modules, $position = null, $type = ResourceLoaderModule::TYPE_COMBINED ){
 407                 $resourceLoader = $this->getResourceLoader();
 408                 $filteredModules = array();
 409                 foreach( $modules as $val ){
 410                         $module = $resourceLoader->getModule( $val );
 411                         if( $module instanceof ResourceLoaderModule
 412                                 && $module->getOrigin() <= $this->getAllowedModules( $type )
 413                                 && ( is_null( $position ) || $module->getPosition() == $position ) )
 414                         {
 415                                 $filteredModules[] = $val;
 416                         }
 417                 }
 418                 return $filteredModules;
 419         }
 420
 421         /**
 422          * Get the list of modules to include on this page
 423          *
 424          * @param $filter Bool whether to filter out insufficiently trustworthy modules
 425          * @param $position String if not null, only return modules with this position
 426          * @param $param string
 427          * @return Array of module names
 428          */
 429         public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
 430                 $modules = array_values( array_unique( $this->$param ) );
 431                 return $filter
 432                         ? $this->filterModules( $modules, $position )
 433                         : $modules;
 434         }
 435
 436         /**
 437          * Add one or more modules recognized by the resource loader. Modules added
 438          * through this function will be loaded by the resource loader when the
 439          * page loads.
 440          *
 441          * @param $modules Mixed: module name (string) or array of module names
 442          */
 443         public function addModules( $modules ) {
 444                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 445         }
 446
 447         /**
 448          * Get the list of module JS to include on this page
 449          *
 450          * @param $filter
 451          * @param $position
 452          *
 453          * @return array of module names
 454          */
 455         public function getModuleScripts( $filter = false, $position = null ) {
 456                 return $this->getModules( $filter, $position, 'mModuleScripts' );
 457         }
 458
 459         /**
 460          * Add only JS of one or more modules recognized by the resource loader. Module
 461          * scripts added through this function will be loaded by the resource loader when
 462          * the page loads.
 463          *
 464          * @param $modules Mixed: module name (string) or array of module names
 465          */
 466         public function addModuleScripts( $modules ) {
 467                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 468         }
 469
 470         /**
 471          * Get the list of module CSS to include on this page
 472          *
 473          * @param $filter
 474          * @param $position
 475          *
 476          * @return Array of module names
 477          */
 478         public function getModuleStyles( $filter = false, $position = null ) {
 479                 return $this->getModules( $filter,  $position, 'mModuleStyles' );
 480         }
 481
 482         /**
 483          * Add only CSS of one or more modules recognized by the resource loader. Module
 484          * styles added through this function will be loaded by the resource loader when
 485          * the page loads.
 486          *
 487          * @param $modules Mixed: module name (string) or array of module names
 488          */
 489         public function addModuleStyles( $modules ) {
 490                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 491         }
 492
 493         /**
 494          * Get the list of module messages to include on this page
 495          *
 496          * @param $filter
 497          * @param $position
 498          *
 499          * @return Array of module names
 500          */
 501         public function getModuleMessages( $filter = false, $position = null ) {
 502                 return $this->getModules( $filter, $position, 'mModuleMessages' );
 503         }
 504
 505         /**
 506          * Add only messages of one or more modules recognized by the resource loader.
 507          * Module messages added through this function will be loaded by the resource
 508          * loader when the page loads.
 509          *
 510          * @param $modules Mixed: module name (string) or array of module names
 511          */
 512         public function addModuleMessages( $modules ) {
 513                 $this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );
 514         }
 515
 516         /**
 517          * Get an array of head items
 518          *
 519          * @return Array
 520          */
 521         function getHeadItemsArray() {
 522                 return $this->mHeadItems;
 523         }
 524
 525         /**
 526          * Get all header items in a string
 527          *
 528          * @return String
 529          */
 530         function getHeadItems() {
 531                 $s = '';
 532                 foreach ( $this->mHeadItems as $item ) {
 533                         $s .= $item;
 534                 }
 535                 return $s;
 536         }
 537
 538         /**
 539          * Add or replace an header item to the output
 540          *
 541          * @param $name String: item name
 542          * @param $value String: raw HTML
 543          */
 544         public function addHeadItem( $name, $value ) {
 545                 $this->mHeadItems[$name] = $value;
 546         }
 547
 548         /**
 549          * Check if the header item $name is already set
 550          *
 551          * @param $name String: item name
 552          * @return Boolean
 553          */
 554         public function hasHeadItem( $name ) {
 555                 return isset( $this->mHeadItems[$name] );
 556         }
 557
 558         /**
 559          * Set the value of the ETag HTTP header, only used if $wgUseETag is true
 560          *
 561          * @param $tag String: value of "ETag" header
 562          */
 563         function setETag( $tag ) {
 564                 $this->mETag = $tag;
 565         }
 566
 567         /**
 568          * Set whether the output should only contain the body of the article,
 569          * without any skin, sidebar, etc.
 570          * Used e.g. when calling with "action=render".
 571          *
 572          * @param $only Boolean: whether to output only the body of the article
 573          */
 574         public function setArticleBodyOnly( $only ) {
 575                 $this->mArticleBodyOnly = $only;
 576         }
 577
 578         /**
 579          * Return whether the output will contain only the body of the article
 580          *
 581          * @return Boolean
 582          */
 583         public function getArticleBodyOnly() {
 584                 return $this->mArticleBodyOnly;
 585         }
 586
 587         /**
 588          * checkLastModified tells the client to use the client-cached page if
 589          * possible. If sucessful, the OutputPage is disabled so that
 590          * any future call to OutputPage->output() have no effect.
 591          *
 592          * Side effect: sets mLastModified for Last-Modified header
 593          *
 594          * @param $timestamp string
 595          *
 596          * @return Boolean: true iff cache-ok headers was sent.
 597          */
 598         public function checkLastModified( $timestamp ) {
 599                 global $wgCachePages, $wgCacheEpoch;
 600
 601                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 602                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 603                         return false;
 604                 }
 605                 if( !$wgCachePages ) {
 606                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 607                         return false;
 608                 }
 609                 if( $this->getUser()->getOption( 'nocache' ) ) {
 610                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 611                         return false;
 612                 }
 613
 614                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 615                 $modifiedTimes = array(
 616                         'page' => $timestamp,
 617                         'user' => $this->getUser()->getTouched(),
 618                         'epoch' => $wgCacheEpoch
 619                 );
 620                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 621
 622                 $maxModified = max( $modifiedTimes );
 623                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 624
 625                 if( empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 626                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 627                         return false;
 628                 }
 629
 630                 # Make debug info
 631                 $info = '';
 632                 foreach ( $modifiedTimes as $name => $value ) {
 633                         if ( $info !== '' ) {
 634                                 $info .= ', ';
 635                         }
 636                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 637                 }
 638
 639                 # IE sends sizes after the date like this:
 640                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 641                 # this breaks strtotime().
 642                 $clientHeader = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 643
 644                 wfSuppressWarnings(); // E_STRICT system time bitching
 645                 $clientHeaderTime = strtotime( $clientHeader );
 646                 wfRestoreWarnings();
 647                 if ( !$clientHeaderTime ) {
 648                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 649                         return false;
 650                 }
 651                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 652
 653                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 654                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
 655                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 656                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
 657                 if( $clientHeaderTime < $maxModified ) {
 658                         wfDebug( __METHOD__ . ": STALE, $info\n", false );
 659                         return false;
 660                 }
 661
 662                 # Not modified
 663                 # Give a 304 response code and disable body output
 664                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
 665                 ini_set( 'zlib.output_compression', 0 );
 666                 $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
 667                 $this->sendCacheControl();
 668                 $this->disable();
 669
 670                 // Don't output a compressed blob when using ob_gzhandler;
 671                 // it's technically against HTTP spec and seems to confuse
 672                 // Firefox when the response gets split over two packets.
 673                 wfClearOutputBuffers();
 674
 675                 return true;
 676         }
 677
 678         /**
 679          * Override the last modified timestamp
 680          *
 681          * @param $timestamp String: new timestamp, in a format readable by
 682          *        wfTimestamp()
 683          */
 684         public function setLastModified( $timestamp ) {
 685                 $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
 686         }
 687
 688         /**
 689          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 690          *
 691          * @param $policy String: the literal string to output as the contents of
 692          *   the meta tag.  Will be parsed according to the spec and output in
 693          *   standardized form.
 694          * @return null
 695          */
 696         public function setRobotPolicy( $policy ) {
 697                 $policy = Article::formatRobotPolicy( $policy );
 698
 699                 if( isset( $policy['index'] ) ) {
 700                         $this->setIndexPolicy( $policy['index'] );
 701                 }
 702                 if( isset( $policy['follow'] ) ) {
 703                         $this->setFollowPolicy( $policy['follow'] );
 704                 }
 705         }
 706
 707         /**
 708          * Set the index policy for the page, but leave the follow policy un-
 709          * touched.
 710          *
 711          * @param $policy string Either 'index' or 'noindex'.
 712          * @return null
 713          */
 714         public function setIndexPolicy( $policy ) {
 715                 $policy = trim( $policy );
 716                 if( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 717                         $this->mIndexPolicy = $policy;
 718                 }
 719         }
 720
 721         /**
 722          * Set the follow policy for the page, but leave the index policy un-
 723          * touched.
 724          *
 725          * @param $policy String: either 'follow' or 'nofollow'.
 726          * @return null
 727          */
 728         public function setFollowPolicy( $policy ) {
 729                 $policy = trim( $policy );
 730                 if( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 731                         $this->mFollowPolicy = $policy;
 732                 }
 733         }
 734
 735         /**
 736          * Set the new value of the "action text", this will be added to the
 737          * "HTML title", separated from it with " - ".
 738          *
 739          * @param $text String: new value of the "action text"
 740          */
 741         public function setPageTitleActionText( $text ) {
 742                 $this->mPageTitleActionText = $text;
 743         }
 744
 745         /**
 746          * Get the value of the "action text"
 747          *
 748          * @return String
 749          */
 750         public function getPageTitleActionText() {
 751                 if ( isset( $this->mPageTitleActionText ) ) {
 752                         return $this->mPageTitleActionText;
 753                 }
 754         }
 755
 756         /**
 757          * "HTML title" means the contents of <title>.
 758          * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
 759          *
 760          * @param $name string
 761          */
 762         public function setHTMLTitle( $name ) {
 763                 if ( $name instanceof Message ) {
 764                         $this->mHTMLtitle = $name->setContext( $this->getContext() )->text();
 765                 } else {
 766                         $this->mHTMLtitle = $name;
 767                 }
 768         }
 769
 770         /**
 771          * Return the "HTML title", i.e. the content of the <title> tag.
 772          *
 773          * @return String
 774          */
 775         public function getHTMLTitle() {
 776                 return $this->mHTMLtitle;
 777         }
 778
 779         /**
 780          * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.
 781          * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.
 782          * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.
 783          * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.
 784          *
 785          * @param $name string|Message
 786          */
 787         public function setPageTitle( $name ) {
 788                 if ( $name instanceof Message ) {
 789                         $name = $name->setContext( $this->getContext() )->text();
 790                 }
 791
 792                 # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
 793                 # but leave "<i>foobar</i>" alone
 794                 $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
 795                 $this->mPagetitle = $nameWithTags;
 796
 797                 # change "<i>foo&amp;bar</i>" to "foo&bar"
 798                 $this->setHTMLTitle( $this->msg( 'pagetitle', Sanitizer::stripAllTags( $nameWithTags ) ) );
 799         }
 800
 801         /**
 802          * Return the "page title", i.e. the content of the \<h1\> tag.
 803          *
 804          * @return String
 805          */
 806         public function getPageTitle() {
 807                 return $this->mPagetitle;
 808         }
 809
 810         /**
 811          * Set the Title object to use
 812          *
 813          * @param $t Title object
 814          */
 815         public function setTitle( Title $t ) {
 816                 $this->getContext()->setTitle( $t );
 817         }
 818
 819
 820         /**
 821          * Replace the subtile with $str
 822          *
 823          * @param $str String: new value of the subtitle
 824          */
 825         public function setSubtitle( $str ) {
 826                 $this->mSubtitle = /*$this->parse(*/ $str /*)*/; // @bug 2514
 827         }
 828
 829         /**
 830          * Add $str to the subtitle
 831          *
 832          * @param $str String to add to the subtitle
 833          */
 834         public function appendSubtitle( $str ) {
 835                 $this->mSubtitle .= /*$this->parse(*/ $str /*)*/; // @bug 2514
 836         }
 837
 838         /**
 839          * Get the subtitle
 840          *
 841          * @return String
 842          */
 843         public function getSubtitle() {
 844                 return $this->mSubtitle;
 845         }
 846
 847         /**
 848          * Set the page as printable, i.e. it'll be displayed with with all
 849          * print styles included
 850          */
 851         public function setPrintable() {
 852                 $this->mPrintable = true;
 853         }
 854
 855         /**
 856          * Return whether the page is "printable"
 857          *
 858          * @return Boolean
 859          */
 860         public function isPrintable() {
 861                 return $this->mPrintable;
 862         }
 863
 864         /**
 865          * Disable output completely, i.e. calling output() will have no effect
 866          */
 867         public function disable() {
 868                 $this->mDoNothing = true;
 869         }
 870
 871         /**
 872          * Return whether the output will be completely disabled
 873          *
 874          * @return Boolean
 875          */
 876         public function isDisabled() {
 877                 return $this->mDoNothing;
 878         }
 879
 880         /**
 881          * Show an "add new section" link?
 882          *
 883          * @return Boolean
 884          */
 885         public function showNewSectionLink() {
 886                 return $this->mNewSectionLink;
 887         }
 888
 889         /**
 890          * Forcibly hide the new section link?
 891          *
 892          * @return Boolean
 893          */
 894         public function forceHideNewSectionLink() {
 895                 return $this->mHideNewSectionLink;
 896         }
 897
 898         /**
 899          * Add or remove feed links in the page header
 900          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 901          * for the new version
 902          * @see addFeedLink()
 903          *
 904          * @param $show Boolean: true: add default feeds, false: remove all feeds
 905          */
 906         public function setSyndicated( $show = true ) {
 907                 if ( $show ) {
 908                         $this->setFeedAppendQuery( false );
 909                 } else {
 910                         $this->mFeedLinks = array();
 911                 }
 912         }
 913
 914         /**
 915          * Add default feeds to the page header
 916          * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
 917          * for the new version
 918          * @see addFeedLink()
 919          *
 920          * @param $val String: query to append to feed links or false to output
 921          *        default links
 922          */
 923         public function setFeedAppendQuery( $val ) {
 924                 global $wgAdvertisedFeedTypes;
 925
 926                 $this->mFeedLinks = array();
 927
 928                 foreach ( $wgAdvertisedFeedTypes as $type ) {
 929                         $query = "feed=$type";
 930                         if ( is_string( $val ) ) {
 931                                 $query .= '&' . $val;
 932                         }
 933                         $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
 934                 }
 935         }
 936
 937         /**
 938          * Add a feed link to the page header
 939          *
 940          * @param $format String: feed type, should be a key of $wgFeedClasses
 941          * @param $href String: URL
 942          */
 943         public function addFeedLink( $format, $href ) {
 944                 global $wgAdvertisedFeedTypes;
 945
 946                 if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
 947                         $this->mFeedLinks[$format] = $href;
 948                 }
 949         }
 950
 951         /**
 952          * Should we output feed links for this page?
 953          * @return Boolean
 954          */
 955         public function isSyndicated() {
 956                 return count( $this->mFeedLinks ) > 0;
 957         }
 958
 959         /**
 960          * Return URLs for each supported syndication format for this page.
 961          * @return array associating format keys with URLs
 962          */
 963         public function getSyndicationLinks() {
 964                 return $this->mFeedLinks;
 965         }
 966
 967         /**
 968          * Will currently always return null
 969          *
 970          * @return null
 971          */
 972         public function getFeedAppendQuery() {
 973                 return $this->mFeedLinksAppendQuery;
 974         }
 975
 976         /**
 977          * Set whether the displayed content is related to the source of the
 978          * corresponding article on the wiki
 979          * Setting true will cause the change "article related" toggle to true
 980          *
 981          * @param $v Boolean
 982          */
 983         public function setArticleFlag( $v ) {
 984                 $this->mIsarticle = $v;
 985                 if ( $v ) {
 986                         $this->mIsArticleRelated = $v;
 987                 }
 988         }
 989
 990         /**
 991          * Return whether the content displayed page is related to the source of
 992          * the corresponding article on the wiki
 993          *
 994          * @return Boolean
 995          */
 996         public function isArticle() {
 997                 return $this->mIsarticle;
 998         }
 999
1000         /**
1001          * Set whether this page is related an article on the wiki
1002          * Setting false will cause the change of "article flag" toggle to false
1003          *
1004          * @param $v Boolean
1005          */
1006         public function setArticleRelated( $v ) {
1007                 $this->mIsArticleRelated = $v;
1008                 if ( !$v ) {
1009                         $this->mIsarticle = false;
1010                 }
1011         }
1012
1013         /**
1014          * Return whether this page is related an article on the wiki
1015          *
1016          * @return Boolean
1017          */
1018         public function isArticleRelated() {
1019                 return $this->mIsArticleRelated;
1020         }
1021
1022         /**
1023          * Add new language links
1024          *
1025          * @param $newLinkArray Associative array mapping language code to the page
1026          *                      name
1027          */
1028         public function addLanguageLinks( $newLinkArray ) {
1029                 $this->mLanguageLinks += $newLinkArray;
1030         }
1031
1032         /**
1033          * Reset the language links and add new language links
1034          *
1035          * @param $newLinkArray Associative array mapping language code to the page
1036          *                      name
1037          */
1038         public function setLanguageLinks( $newLinkArray ) {
1039                 $this->mLanguageLinks = $newLinkArray;
1040         }
1041
1042         /**
1043          * Get the list of language links
1044          *
1045          * @return Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
1046          */
1047         public function getLanguageLinks() {
1048                 return $this->mLanguageLinks;
1049         }
1050
1051         /**
1052          * Add an array of categories, with names in the keys
1053          *
1054          * @param $categories Array mapping category name => sort key
1055          */
1056         public function addCategoryLinks( $categories ) {
1057                 global $wgContLang;
1058
1059                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
1060                         return;
1061                 }
1062
1063                 # Add the links to a LinkBatch
1064                 $arr = array( NS_CATEGORY => $categories );
1065                 $lb = new LinkBatch;
1066                 $lb->setArray( $arr );
1067
1068                 # Fetch existence plus the hiddencat property
1069                 $dbr = wfGetDB( DB_SLAVE );
1070                 $res = $dbr->select( array( 'page', 'page_props' ),
1071                         array( 'page_id', 'page_namespace', 'page_title', 'page_len', 'page_is_redirect', 'page_latest', 'pp_value' ),
1072                         $lb->constructSet( 'page', $dbr ),
1073                         __METHOD__,
1074                         array(),
1075                         array( 'page_props' => array( 'LEFT JOIN', array( 'pp_propname' => 'hiddencat', 'pp_page = page_id' ) ) )
1076                 );
1077
1078                 # Add the results to the link cache
1079                 $lb->addResultToCache( LinkCache::singleton(), $res );
1080
1081                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
1082                 $categories = array_combine(
1083                         array_keys( $categories ),
1084                         array_fill( 0, count( $categories ), 'normal' )
1085                 );
1086
1087                 # Mark hidden categories
1088                 foreach ( $res as $row ) {
1089                         if ( isset( $row->pp_value ) ) {
1090                                 $categories[$row->page_title] = 'hidden';
1091                         }
1092                 }
1093
1094                 # Add the remaining categories to the skin
1095                 if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
1096                         foreach ( $categories as $category => $type ) {
1097                                 $origcategory = $category;
1098                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
1099                                 $wgContLang->findVariantLink( $category, $title, true );
1100                                 if ( $category != $origcategory ) {
1101                                         if ( array_key_exists( $category, $categories ) ) {
1102                                                 continue;
1103                                         }
1104                                 }
1105                                 $text = $wgContLang->convertHtml( $title->getText() );
1106                                 $this->mCategories[] = $title->getText();
1107                                 $this->mCategoryLinks[$type][] = Linker::link( $title, $text );
1108                         }
1109                 }
1110         }
1111
1112         /**
1113          * Reset the category links (but not the category list) and add $categories
1114          *
1115          * @param $categories Array mapping category name => sort key
1116          */
1117         public function setCategoryLinks( $categories ) {
1118                 $this->mCategoryLinks = array();
1119                 $this->addCategoryLinks( $categories );
1120         }
1121
1122         /**
1123          * Get the list of category links, in a 2-D array with the following format:
1124          * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
1125          * hidden categories) and $link a HTML fragment with a link to the category
1126          * page
1127          *
1128          * @return Array
1129          */
1130         public function getCategoryLinks() {
1131                 return $this->mCategoryLinks;
1132         }
1133
1134         /**
1135          * Get the list of category names this page belongs to
1136          *
1137          * @return Array of strings
1138          */
1139         public function getCategories() {
1140                 return $this->mCategories;
1141         }
1142
1143         /**
1144          * Do not allow scripts which can be modified by wiki users to load on this page;
1145          * only allow scripts bundled with, or generated by, the software.
1146          */
1147         public function disallowUserJs() {
1148                 $this->reduceAllowedModules(
1149                         ResourceLoaderModule::TYPE_SCRIPTS,
1150                         ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
1151                 );
1152         }
1153
1154         /**
1155          * Return whether user JavaScript is allowed for this page
1156          * @deprecated since 1.18 Load modules with ResourceLoader, and origin and
1157          *     trustworthiness is identified and enforced automagically.
1158          * @return Boolean
1159          */
1160         public function isUserJsAllowed() {
1161                 return $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS ) >= ResourceLoaderModule::ORIGIN_USER_INDIVIDUAL;
1162         }
1163
1164         /**
1165          * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
1166          * @see ResourceLoaderModule::$origin
1167          * @param $type String ResourceLoaderModule TYPE_ constant
1168          * @return Int ResourceLoaderModule ORIGIN_ class constant
1169          */
1170         public function getAllowedModules( $type ){
1171                 if( $type == ResourceLoaderModule::TYPE_COMBINED ){
1172                         return min( array_values( $this->mAllowedModules ) );
1173                 } else {
1174                         return isset( $this->mAllowedModules[$type] )
1175                                 ? $this->mAllowedModules[$type]
1176                                 : ResourceLoaderModule::ORIGIN_ALL;
1177                 }
1178         }
1179
1180         /**
1181          * Set the highest level of CSS/JS untrustworthiness allowed
1182          * @param  $type String ResourceLoaderModule TYPE_ constant
1183          * @param  $level Int ResourceLoaderModule class constant
1184          */
1185         public function setAllowedModules( $type, $level ){
1186                 $this->mAllowedModules[$type] = $level;
1187         }
1188
1189         /**
1190          * As for setAllowedModules(), but don't inadvertantly make the page more accessible
1191          * @param  $type String
1192          * @param  $level Int ResourceLoaderModule class constant
1193          */
1194         public function reduceAllowedModules( $type, $level ){
1195                 $this->mAllowedModules[$type] = min( $this->getAllowedModules($type), $level );
1196         }
1197
1198         /**
1199          * Prepend $text to the body HTML
1200          *
1201          * @param $text String: HTML
1202          */
1203         public function prependHTML( $text ) {
1204                 $this->mBodytext = $text . $this->mBodytext;
1205         }
1206
1207         /**
1208          * Append $text to the body HTML
1209          *
1210          * @param $text String: HTML
1211          */
1212         public function addHTML( $text ) {
1213                 $this->mBodytext .= $text;
1214         }
1215
1216         /**
1217          * Shortcut for adding an Html::element via addHTML.
1218          *
1219          * @since 1.19
1220          *
1221          * @param $element string
1222          * @param $attribs array
1223          * @param $contents string
1224          */
1225         public function addElement( $element, $attribs = array(), $contents = '' ) {
1226                 $this->addHTML( Html::element( $element, $attribs, $contents ) );
1227         }
1228
1229         /**
1230          * Clear the body HTML
1231          */
1232         public function clearHTML() {
1233                 $this->mBodytext = '';
1234         }
1235
1236         /**
1237          * Get the body HTML
1238          *
1239          * @return String: HTML
1240          */
1241         public function getHTML() {
1242                 return $this->mBodytext;
1243         }
1244
1245         /**
1246          * Add $text to the debug output
1247          *
1248          * @param $text String: debug text
1249          */
1250         public function debug( $text ) {
1251                 $this->mDebugtext .= $text;
1252         }
1253
1254         /**
1255          * Get/set the ParserOptions object to use for wikitext parsing
1256          *
1257          * @param $options either the ParserOption to use or null to only get the
1258          *                 current ParserOption object
1259          * @return ParserOptions object
1260          */
1261         public function parserOptions( $options = null ) {
1262                 if ( !$this->mParserOptions ) {
1263                         $this->mParserOptions = ParserOptions::newFromContext( $this->getContext() );
1264                         $this->mParserOptions->setEditSection( false );
1265                 }
1266                 return wfSetVar( $this->mParserOptions, $options );
1267         }
1268
1269         /**
1270          * Set the revision ID which will be seen by the wiki text parser
1271          * for things such as embedded {{REVISIONID}} variable use.
1272          *
1273          * @param $revid Mixed: an positive integer, or null
1274          * @return Mixed: previous value
1275          */
1276         public function setRevisionId( $revid ) {
1277                 $val = is_null( $revid ) ? null : intval( $revid );
1278                 return wfSetVar( $this->mRevisionId, $val );
1279         }
1280
1281         /**
1282          * Get the displayed revision ID
1283          *
1284          * @return Integer
1285          */
1286         public function getRevisionId() {
1287                 return $this->mRevisionId;
1288         }
1289
1290         /**
1291          * Set the displayed file version
1292          *
1293          * @param $file File|false
1294          * @return Mixed: previous value
1295          */
1296         public function setFileVersion( $file ) {
1297                 $val = null;
1298                 if ( $file instanceof File && $file->exists() ) {
1299                         $val = array( 'time' => $file->getTimestamp(), 'sha1' => $file->getSha1() );
1300                 }
1301                 return wfSetVar( $this->mFileVersion, $val, true );
1302         }
1303
1304         /**
1305          * Get the displayed file version
1306          *
1307          * @return Array|null ('time' => MW timestamp, 'sha1' => sha1)
1308          */
1309         public function getFileVersion() {
1310                 return $this->mFileVersion;
1311         }
1312
1313         /**
1314          * Get the templates used on this page
1315          *
1316          * @return Array (namespace => dbKey => revId)
1317          * @since 1.18
1318          */
1319         public function getTemplateIds() {
1320                 return $this->mTemplateIds;
1321         }
1322
1323         /**
1324          * Get the files used on this page
1325          *
1326          * @return Array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
1327          * @since 1.18
1328          */
1329         public function getFileSearchOptions() {
1330                 return $this->mImageTimeKeys;
1331         }
1332
1333         /**
1334          * Convert wikitext to HTML and add it to the buffer
1335          * Default assumes that the current page title will be used.
1336          *
1337          * @param $text String
1338          * @param $linestart Boolean: is this the start of a line?
1339          * @param $interface Boolean: is this text in the user interface language?
1340          */
1341         public function addWikiText( $text, $linestart = true, $interface = true ) {
1342                 $title = $this->getTitle(); // Work arround E_STRICT
1343                 $this->addWikiTextTitle( $text, $title, $linestart, /*tidy*/false, $interface );
1344         }
1345
1346         /**
1347          * Add wikitext with a custom Title object
1348          *
1349          * @param $text String: wikitext
1350          * @param $title Title object
1351          * @param $linestart Boolean: is this the start of a line?
1352          */
1353         public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
1354                 $this->addWikiTextTitle( $text, $title, $linestart );
1355         }
1356
1357         /**
1358          * Add wikitext with a custom Title object and tidy enabled.
1359          *
1360          * @param $text String: wikitext
1361          * @param $title Title object
1362          * @param $linestart Boolean: is this the start of a line?
1363          */
1364         function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
1365                 $this->addWikiTextTitle( $text, $title, $linestart, true );
1366         }
1367
1368         /**
1369          * Add wikitext with tidy enabled
1370          *
1371          * @param $text String: wikitext
1372          * @param $linestart Boolean: is this the start of a line?
1373          */
1374         public function addWikiTextTidy( $text, $linestart = true ) {
1375                 $title = $this->getTitle();
1376                 $this->addWikiTextTitleTidy( $text, $title, $linestart );
1377         }
1378
1379         /**
1380          * Add wikitext with a custom Title object
1381          *
1382          * @param $text String: wikitext
1383          * @param $title Title object
1384          * @param $linestart Boolean: is this the start of a line?
1385          * @param $tidy Boolean: whether to use tidy
1386          * @param $interface Boolean: whether it is an interface message
1387          *                                                              (for example disables conversion)
1388          */
1389         public function addWikiTextTitle( $text, &$title, $linestart, $tidy = false, $interface = false ) {
1390                 global $wgParser;
1391
1392                 wfProfileIn( __METHOD__ );
1393
1394                 wfIncrStats( 'pcache_not_possible' );
1395
1396                 $popts = $this->parserOptions();
1397                 $oldTidy = $popts->setTidy( $tidy );
1398                 $popts->setInterfaceMessage( (bool) $interface );
1399
1400                 $parserOutput = $wgParser->parse(
1401                         $text, $title, $popts,
1402                         $linestart, true, $this->mRevisionId
1403                 );
1404
1405                 $popts->setTidy( $oldTidy );
1406
1407                 $this->addParserOutput( $parserOutput );
1408
1409                 wfProfileOut( __METHOD__ );
1410         }
1411
1412         /**
1413          * Add a ParserOutput object, but without Html
1414          *
1415          * @param $parserOutput ParserOutput object
1416          */
1417         public function addParserOutputNoText( &$parserOutput ) {
1418                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
1419                 $this->addCategoryLinks( $parserOutput->getCategories() );
1420                 $this->mNewSectionLink = $parserOutput->getNewSection();
1421                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
1422
1423                 $this->mParseWarnings = $parserOutput->getWarnings();
1424                 if ( !$parserOutput->isCacheable() ) {
1425                         $this->enableClientCache( false );
1426                 }
1427                 $this->mNoGallery = $parserOutput->getNoGallery();
1428                 $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
1429                 $this->addModules( $parserOutput->getModules() );
1430                 $this->addModuleScripts( $parserOutput->getModuleScripts() );
1431                 $this->addModuleStyles( $parserOutput->getModuleStyles() );
1432                 $this->addModuleMessages( $parserOutput->getModuleMessages() );
1433
1434                 // Template versioning...
1435                 foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
1436                         if ( isset( $this->mTemplateIds[$ns] ) ) {
1437                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
1438                         } else {
1439                                 $this->mTemplateIds[$ns] = $dbks;
1440                         }
1441                 }
1442                 // File versioning...
1443                 foreach ( (array)$parserOutput->getFileSearchOptions() as $dbk => $data ) {
1444                         $this->mImageTimeKeys[$dbk] = $data;
1445                 }
1446
1447                 // Hooks registered in the object
1448                 global $wgParserOutputHooks;
1449                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
1450                         list( $hookName, $data ) = $hookInfo;
1451                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
1452                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
1453                         }
1454                 }
1455
1456                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
1457         }
1458
1459         /**
1460          * Add a ParserOutput object
1461          *
1462          * @param $parserOutput ParserOutput
1463          */
1464         function addParserOutput( &$parserOutput ) {
1465                 $this->addParserOutputNoText( $parserOutput );
1466                 $text = $parserOutput->getText();
1467                 wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
1468                 $this->addHTML( $text );
1469         }
1470
1471
1472         /**
1473          * Add the output of a QuickTemplate to the output buffer
1474          *
1475          * @param $template QuickTemplate
1476          */
1477         public function addTemplate( &$template ) {
1478                 ob_start();
1479                 $template->execute();
1480                 $this->addHTML( ob_get_contents() );
1481                 ob_end_clean();
1482         }
1483
1484         /**
1485          * Parse wikitext and return the HTML.
1486          *
1487          * @param $text String
1488          * @param $linestart Boolean: is this the start of a line?
1489          * @param $interface Boolean: use interface language ($wgLang instead of
1490          *                   $wgContLang) while parsing language sensitive magic
1491          *                   words like GRAMMAR and PLURAL. This also disables
1492          *                                       LanguageConverter.
1493          * @param $language  Language object: target language object, will override
1494          *                   $interface
1495          * @return String: HTML
1496          */
1497         public function parse( $text, $linestart = true, $interface = false, $language = null ) {
1498                 global $wgParser;
1499
1500                 if( is_null( $this->getTitle() ) ) {
1501                         throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
1502                 }
1503
1504                 $popts = $this->parserOptions();
1505                 if ( $interface ) {
1506                         $popts->setInterfaceMessage( true );
1507                 }
1508                 if ( $language !== null ) {
1509                         $oldLang = $popts->setTargetLanguage( $language );
1510                 }
1511
1512                 $parserOutput = $wgParser->parse(
1513                         $text, $this->getTitle(), $popts,
1514                         $linestart, true, $this->mRevisionId
1515                 );
1516
1517                 if ( $interface ) {
1518                         $popts->setInterfaceMessage( false );
1519                 }
1520                 if ( $language !== null ) {
1521                         $popts->setTargetLanguage( $oldLang );
1522                 }
1523
1524                 return $parserOutput->getText();
1525         }
1526
1527         /**
1528          * Parse wikitext, strip paragraphs, and return the HTML.
1529          *
1530          * @param $text String
1531          * @param $linestart Boolean: is this the start of a line?
1532          * @param $interface Boolean: use interface language ($wgLang instead of
1533          *                   $wgContLang) while parsing language sensitive magic
1534          *                   words like GRAMMAR and PLURAL
1535          * @return String: HTML
1536          */
1537         public function parseInline( $text, $linestart = true, $interface = false ) {
1538                 $parsed = $this->parse( $text, $linestart, $interface );
1539
1540                 $m = array();
1541                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
1542                         $parsed = $m[1];
1543                 }
1544
1545                 return $parsed;
1546         }
1547
1548         /**
1549          * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
1550          *
1551          * @param $maxage Integer: maximum cache time on the Squid, in seconds.
1552          */
1553         public function setSquidMaxage( $maxage ) {
1554                 $this->mSquidMaxage = $maxage;
1555         }
1556
1557         /**
1558          * Use enableClientCache(false) to force it to send nocache headers
1559          *
1560          * @param $state bool
1561          *
1562          * @return bool
1563          */
1564         public function enableClientCache( $state ) {
1565                 return wfSetVar( $this->mEnableClientCache, $state );
1566         }
1567
1568         /**
1569          * Get the list of cookies that will influence on the cache
1570          *
1571          * @return Array
1572          */
1573         function getCacheVaryCookies() {
1574                 global $wgCookiePrefix, $wgCacheVaryCookies;
1575                 static $cookies;
1576                 if ( $cookies === null ) {
1577                         $cookies = array_merge(
1578                                 array(
1579                                         "{$wgCookiePrefix}Token",
1580                                         "{$wgCookiePrefix}LoggedOut",
1581                                         session_name()
1582                                 ),
1583                                 $wgCacheVaryCookies
1584                         );
1585                         wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
1586                 }
1587                 return $cookies;
1588         }
1589
1590         /**
1591          * Return whether this page is not cacheable because "useskin" or "uselang"
1592          * URL parameters were passed.
1593          *
1594          * @return Boolean
1595          */
1596         function uncacheableBecauseRequestVars() {
1597                 $request = $this->getRequest();
1598                 return $request->getText( 'useskin', false ) === false
1599                         && $request->getText( 'uselang', false ) === false;
1600         }
1601
1602         /**
1603          * Check if the request has a cache-varying cookie header
1604          * If it does, it's very important that we don't allow public caching
1605          *
1606          * @return Boolean
1607          */
1608         function haveCacheVaryCookies() {
1609                 $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
1610                 if ( $cookieHeader === false ) {
1611                         return false;
1612                 }
1613                 $cvCookies = $this->getCacheVaryCookies();
1614                 foreach ( $cvCookies as $cookieName ) {
1615                         # Check for a simple string match, like the way squid does it
1616                         if ( strpos( $cookieHeader, $cookieName ) !== false ) {
1617                                 wfDebug( __METHOD__ . ": found $cookieName\n" );
1618                                 return true;
1619                         }
1620                 }
1621                 wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
1622                 return false;
1623         }
1624
1625         /**
1626          * Add an HTTP header that will influence on the cache
1627          *
1628          * @param $header String: header name
1629          * @param $option Array|null
1630          * @todo FIXME: Document the $option parameter; it appears to be for
1631          *        X-Vary-Options but what format is acceptable?
1632          */
1633         public function addVaryHeader( $header, $option = null ) {
1634                 if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
1635                         $this->mVaryHeader[$header] = (array)$option;
1636                 } elseif( is_array( $option ) ) {
1637                         if( is_array( $this->mVaryHeader[$header] ) ) {
1638                                 $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
1639                         } else {
1640                                 $this->mVaryHeader[$header] = $option;
1641                         }
1642                 }
1643                 $this->mVaryHeader[$header] = array_unique( (array)$this->mVaryHeader[$header] );
1644         }
1645
1646         /**
1647          * Get a complete X-Vary-Options header
1648          *
1649          * @return String
1650          */
1651         public function getXVO() {
1652                 $cvCookies = $this->getCacheVaryCookies();
1653
1654                 $cookiesOption = array();
1655                 foreach ( $cvCookies as $cookieName ) {
1656                         $cookiesOption[] = 'string-contains=' . $cookieName;
1657                 }
1658                 $this->addVaryHeader( 'Cookie', $cookiesOption );
1659
1660                 $headers = array();
1661                 foreach( $this->mVaryHeader as $header => $option ) {
1662                         $newheader = $header;
1663                         if( is_array( $option ) ) {
1664                                 $newheader .= ';' . implode( ';', $option );
1665                         }
1666                         $headers[] = $newheader;
1667                 }
1668                 $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
1669
1670                 return $xvo;
1671         }
1672
1673         /**
1674          * bug 21672: Add Accept-Language to Vary and XVO headers
1675          * if there's no 'variant' parameter existed in GET.
1676          *
1677          * For example:
1678          *   /w/index.php?title=Main_page should always be served; but
1679          *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
1680          */
1681         function addAcceptLanguage() {
1682                 $lang = $this->getTitle()->getPageLanguage();
1683                 if( !$this->getRequest()->getCheck( 'variant' ) && $lang->hasVariants() ) {
1684                         $variants = $lang->getVariants();
1685                         $aloption = array();
1686                         foreach ( $variants as $variant ) {
1687                                 if( $variant === $lang->getCode() ) {
1688                                         continue;
1689                                 } else {
1690                                         $aloption[] = 'string-contains=' . $variant;
1691
1692                                         // IE and some other browsers use another form of language code
1693                                         // in their Accept-Language header, like "zh-CN" or "zh-TW".
1694                                         // We should handle these too.
1695                                         $ievariant = explode( '-', $variant );
1696                                         if ( count( $ievariant ) == 2 ) {
1697                                                 $ievariant[1] = strtoupper( $ievariant[1] );
1698                                                 $ievariant = implode( '-', $ievariant );
1699                                                 $aloption[] = 'string-contains=' . $ievariant;
1700                                         }
1701                                 }
1702                         }
1703                         $this->addVaryHeader( 'Accept-Language', $aloption );
1704                 }
1705         }
1706
1707         /**
1708          * Set a flag which will cause an X-Frame-Options header appropriate for
1709          * edit pages to be sent. The header value is controlled by
1710          * $wgEditPageFrameOptions.
1711          *
1712          * This is the default for special pages. If you display a CSRF-protected
1713          * form on an ordinary view page, then you need to call this function.
1714          *
1715          * @param $enable bool
1716          */
1717         public function preventClickjacking( $enable = true ) {
1718                 $this->mPreventClickjacking = $enable;
1719         }
1720
1721         /**
1722          * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
1723          * This can be called from pages which do not contain any CSRF-protected
1724          * HTML form.
1725          */
1726         public function allowClickjacking() {
1727                 $this->mPreventClickjacking = false;
1728         }
1729
1730         /**
1731          * Get the X-Frame-Options header value (without the name part), or false
1732          * if there isn't one. This is used by Skin to determine whether to enable
1733          * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
1734          *
1735          * @return string
1736          */
1737         public function getFrameOptions() {
1738                 global $wgBreakFrames, $wgEditPageFrameOptions;
1739                 if ( $wgBreakFrames ) {
1740                         return 'DENY';
1741                 } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
1742                         return $wgEditPageFrameOptions;
1743                 }
1744                 return false;
1745         }
1746
1747         /**
1748          * Send cache control HTTP headers
1749          */
1750         public function sendCacheControl() {
1751                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgUseXVO;
1752
1753                 $response = $this->getRequest()->response();
1754                 if ( $wgUseETag && $this->mETag ) {
1755                         $response->header( "ETag: $this->mETag" );
1756                 }
1757
1758                 $this->addAcceptLanguage();
1759
1760                 # don't serve compressed data to clients who can't handle it
1761                 # maintain different caches for logged-in users and non-logged in ones
1762                 $response->header( 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) ) );
1763
1764                 if ( $wgUseXVO ) {
1765                         # Add an X-Vary-Options header for Squid with Wikimedia patches
1766                         $response->header( $this->getXVO() );
1767                 }
1768
1769                 if( !$this->uncacheableBecauseRequestVars() && $this->mEnableClientCache ) {
1770                         if(
1771                                 $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
1772                                 $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
1773                         )
1774                         {
1775                                 if ( $wgUseESI ) {
1776                                         # We'll purge the proxy cache explicitly, but require end user agents
1777                                         # to revalidate against the proxy on each visit.
1778                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
1779                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
1780                                         # start with a shorter timeout for initial testing
1781                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
1782                                         $response->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
1783                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
1784                                 } else {
1785                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
1786                                         # to revalidate against the proxy on each visit.
1787                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
1788                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
1789                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
1790                                         # start with a shorter timeout for initial testing
1791                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
1792                                         $response->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
1793                                 }
1794                         } else {
1795                                 # We do want clients to cache if they can, but they *must* check for updates
1796                                 # on revisiting the page.
1797                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
1798                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1799                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
1800                         }
1801                         if($this->mLastModified) {
1802                                 $response->header( "Last-Modified: {$this->mLastModified}" );
1803                         }
1804                 } else {
1805                         wfDebug( __METHOD__ . ": no caching **\n", false );
1806
1807                         # In general, the absence of a last modified header should be enough to prevent
1808                         # the client from using its cache. We send a few other things just to make sure.
1809                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
1810                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
1811                         $response->header( 'Pragma: no-cache' );
1812                 }
1813         }
1814
1815         /**
1816          * Get the message associed with the HTTP response code $code
1817          *
1818          * @param $code Integer: status code
1819          * @return String or null: message or null if $code is not in the list of
1820          *         messages
1821          *
1822          * @deprecated since 1.18 Use HttpStatus::getMessage() instead.
1823          */
1824         public static function getStatusMessage( $code ) {
1825                 wfDeprecated( __METHOD__ );
1826                 return HttpStatus::getMessage( $code );
1827         }
1828
1829         /**
1830          * Finally, all the text has been munged and accumulated into
1831          * the object, let's actually output it:
1832          */
1833         public function output() {
1834                 global $wgLanguageCode, $wgDebugRedirects, $wgMimeType, $wgVaryOnXFP;
1835
1836                 if( $this->mDoNothing ) {
1837                         return;
1838                 }
1839
1840                 wfProfileIn( __METHOD__ );
1841
1842                 $response = $this->getRequest()->response();
1843
1844                 if ( $this->mRedirect != '' ) {
1845                         # Standards require redirect URLs to be absolute
1846                         $this->mRedirect = wfExpandUrl( $this->mRedirect, PROTO_CURRENT );
1847                         if( $this->mRedirectCode == '301' || $this->mRedirectCode == '303' ) {
1848                                 if( !$wgDebugRedirects ) {
1849                                         $message = HttpStatus::getMessage( $this->mRedirectCode );
1850                                         $response->header( "HTTP/1.1 {$this->mRedirectCode} $message" );
1851                                 }
1852                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
1853                         }
1854                         if ( $wgVaryOnXFP ) {
1855                                 $this->addVaryHeader( 'X-Forwarded-Proto' );
1856                         }
1857                         $this->sendCacheControl();
1858
1859                         $response->header( "Content-Type: text/html; charset=utf-8" );
1860                         if( $wgDebugRedirects ) {
1861                                 $url = htmlspecialchars( $this->mRedirect );
1862                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
1863                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
1864                                 print "</body>\n</html>\n";
1865                         } else {
1866                                 $response->header( 'Location: ' . $this->mRedirect );
1867                         }
1868                         wfProfileOut( __METHOD__ );
1869                         return;
1870                 } elseif ( $this->mStatusCode ) {
1871                         $message = HttpStatus::getMessage( $this->mStatusCode );
1872                         if ( $message ) {
1873                                 $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
1874                         }
1875                 }
1876
1877                 # Buffer output; final headers may depend on later processing
1878                 ob_start();
1879
1880                 $response->header( "Content-type: $wgMimeType; charset=UTF-8" );
1881                 $response->header( 'Content-language: ' . $wgLanguageCode );
1882
1883                 // Prevent framing, if requested
1884                 $frameOptions = $this->getFrameOptions();
1885                 if ( $frameOptions ) {
1886                         $response->header( "X-Frame-Options: $frameOptions" );
1887                 }
1888
1889                 if ( $this->mArticleBodyOnly ) {
1890                         $this->out( $this->mBodytext );
1891                 } else {
1892                         $this->addDefaultModules();
1893
1894                         $sk = $this->getSkin();
1895
1896                         // Hook that allows last minute changes to the output page, e.g.
1897                         // adding of CSS or Javascript by extensions.
1898                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
1899
1900                         wfProfileIn( 'Output-skin' );
1901                         $sk->outputPage();
1902                         wfProfileOut( 'Output-skin' );
1903                 }
1904
1905                 $this->sendCacheControl();
1906                 ob_end_flush();
1907                 wfProfileOut( __METHOD__ );
1908         }
1909
1910         /**
1911          * Actually output something with print().
1912          *
1913          * @param $ins String: the string to output
1914          */
1915         public function out( $ins ) {
1916                 print $ins;
1917         }
1918
1919         /**
1920          * Produce a "user is blocked" page.
1921          * @deprecated since 1.18
1922          */
1923         function blockedPage() {
1924                 throw new UserBlockedError( $this->getUser()->mBlock );
1925         }
1926
1927         /**
1928          * Prepare this object to display an error page; disable caching and
1929          * indexing, clear the current text and redirect, set the page's title
1930          * and optionally an custom HTML title (content of the <title> tag).
1931          *
1932          * @param $pageTitle String|Message will be passed directly to setPageTitle()
1933          * @param $htmlTitle String|Message will be passed directly to setHTMLTitle();
1934          *                   optional, if not passed the <title> attribute will be
1935          *                   based on $pageTitle
1936          */
1937         public function prepareErrorPage( $pageTitle, $htmlTitle = false ) {
1938                 if ( $this->getTitle() ) {
1939                         $this->mDebugtext .= 'Original title: ' . $this->getTitle()->getPrefixedText() . "\n";
1940                 }
1941
1942                 $this->setPageTitle( $pageTitle );
1943                 if ( $htmlTitle !== false ) {
1944                         $this->setHTMLTitle( $htmlTitle );
1945                 }
1946                 $this->setRobotPolicy( 'noindex,nofollow' );
1947                 $this->setArticleRelated( false );
1948                 $this->enableClientCache( false );
1949                 $this->mRedirect = '';
1950                 $this->clearHTML();
1951         }
1952
1953         /**
1954          * Output a standard error page
1955          *
1956          * showErrorPage( 'titlemsg', 'pagetextmsg', array( 'param1', 'param2' ) );
1957          * showErrorPage( 'titlemsg', $messageObject );
1958          *
1959          * @param $title String: message key for page title
1960          * @param $msg Mixed: message key (string) for page text, or a Message object
1961          * @param $params Array: message parameters; ignored if $msg is a Message object
1962          */
1963         public function showErrorPage( $title, $msg, $params = array() ) {
1964                 $this->prepareErrorPage( $this->msg( $title ), $this->msg( 'errorpagetitle' ) );
1965
1966                 if ( $msg instanceof Message ){
1967                         $this->addHTML( $msg->parse() );
1968                 } else {
1969                         $this->addWikiMsgArray( $msg, $params );
1970                 }
1971
1972                 $this->returnToMain();
1973         }
1974
1975         /**
1976          * Output a standard permission error page
1977          *
1978          * @param $errors Array: error message keys
1979          * @param $action String: action that was denied or null if unknown
1980          */
1981         public function showPermissionsErrorPage( $errors, $action = null ) {
1982                 $this->prepareErrorPage( $this->msg( 'permissionserrors' ) );
1983
1984                 $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
1985         }
1986
1987         /**
1988          * Display an error page indicating that a given version of MediaWiki is
1989          * required to use it
1990          *
1991          * @param $version Mixed: the version of MediaWiki needed to use the page
1992          */
1993         public function versionRequired( $version ) {
1994                 $this->prepareErrorPage( $this->msg( 'versionrequired', $version ) );
1995
1996                 $this->addWikiMsg( 'versionrequiredtext', $version );
1997                 $this->returnToMain();
1998         }
1999
2000         /**
2001          * Display an error page noting that a given permission bit is required.
2002          * @deprecated since 1.18, just throw the exception directly
2003          * @param $permission String: key required
2004          */
2005         public function permissionRequired( $permission ) {
2006                 throw new PermissionsError( $permission );
2007         }
2008
2009         /**
2010          * Produce the stock "please login to use the wiki" page
2011          */
2012         public function loginToUse() {
2013                 if( $this->getUser()->isLoggedIn() ) {
2014                         throw new PermissionsError( 'read' );
2015                 }
2016
2017                 $this->prepareErrorPage( $this->msg( 'loginreqtitle' ), $this->msg( 'errorpagetitle' ) );
2018
2019                 $loginLink = Linker::linkKnown(
2020                         SpecialPage::getTitleFor( 'Userlogin' ),
2021                         $this->msg( 'loginreqlink' )->escaped(),
2022                         array(),
2023                         array( 'returnto' => $this->getTitle()->getPrefixedText() )
2024                 );
2025                 $this->addHTML( $this->msg( 'loginreqpagetext' )->rawParams( $loginLink )->parse() .
2026                         "\n<!--" . $this->getTitle()->getPrefixedUrl() . '-->' );
2027
2028                 # Don't return to the main page if the user can't read it
2029                 # otherwise we'll end up in a pointless loop
2030                 $mainPage = Title::newMainPage();
2031                 if( $mainPage->userCanRead() ) {
2032                         $this->returnToMain( null, $mainPage );
2033                 }
2034         }
2035
2036         /**
2037          * Format a list of error messages
2038          *
2039          * @param $errors Array of arrays returned by Title::getUserPermissionsErrors
2040          * @param $action String: action that was denied or null if unknown
2041          * @return String: the wikitext error-messages, formatted into a list.
2042          */
2043         public function formatPermissionsErrorMessage( $errors, $action = null ) {
2044                 if ( $action == null ) {
2045                         $text = $this->msg( 'permissionserrorstext', count( $errors ) )->plain() . "\n\n";
2046                 } else {
2047                         $action_desc = $this->msg( "action-$action" )->plain();
2048                         $text = $this->msg(
2049                                 'permissionserrorstext-withaction',
2050                                 count( $errors ),
2051                                 $action_desc
2052                         )->plain() . "\n\n";
2053                 }
2054
2055                 if ( count( $errors ) > 1 ) {
2056                         $text .= '<ul class="permissions-errors">' . "\n";
2057
2058                         foreach( $errors as $error ) {
2059                                 $text .= '<li>';
2060                                 $text .= call_user_func_array( array( $this, 'msg' ), $error )->plain();
2061                                 $text .= "</li>\n";
2062                         }
2063                         $text .= '</ul>';
2064                 } else {
2065                         $text .= "<div class=\"permissions-errors\">\n" .
2066                                         call_user_func_array( array( $this, 'msg' ), reset( $errors ) )->plain() .
2067                                         "\n</div>";
2068                 }
2069
2070                 return $text;
2071         }
2072
2073         /**
2074          * Display a page stating that the Wiki is in read-only mode,
2075          * and optionally show the source of the page that the user
2076          * was trying to edit.  Should only be called (for this
2077          * purpose) after wfReadOnly() has returned true.
2078          *
2079          * For historical reasons, this function is _also_ used to
2080          * show the error message when a user tries to edit a page
2081          * they are not allowed to edit.  (Unless it's because they're
2082          * blocked, then we show blockedPage() instead.)  In this
2083          * case, the second parameter should be set to true and a list
2084          * of reasons supplied as the third parameter.
2085          *
2086          * @todo Needs to be split into multiple functions.
2087          *
2088          * @param $source    String: source code to show (or null).
2089          * @param $protected Boolean: is this a permissions error?
2090          * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().
2091          * @param $action    String: action that was denied or null if unknown
2092          */
2093         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
2094                 $this->setRobotPolicy( 'noindex,nofollow' );
2095                 $this->setArticleRelated( false );
2096
2097                 // If no reason is given, just supply a default "I can't let you do
2098                 // that, Dave" message.  Should only occur if called by legacy code.
2099                 if ( $protected && empty( $reasons ) ) {
2100                         $reasons[] = array( 'badaccess-group0' );
2101                 }
2102
2103                 if ( !empty( $reasons ) ) {
2104                         // Permissions error
2105                         if( $source ) {
2106                                 $this->setPageTitle( $this->msg( 'viewsource' ) );
2107                                 $this->setSubtitle(
2108                                         $this->msg( 'viewsourcefor', Linker::linkKnown( $this->getTitle() ) )->text()
2109                                 );
2110                         } else {
2111                                 $this->setPageTitle( $this->msg( 'badaccess' ) );
2112                         }
2113                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
2114                 } else {
2115                         // Wiki is read only
2116                         throw new ReadOnlyError;
2117                 }
2118
2119                 // Show source, if supplied
2120                 if( is_string( $source ) ) {
2121                         $this->addWikiMsg( 'viewsourcetext' );
2122
2123                         $pageLang = $this->getTitle()->getPageLanguage();
2124                         $params = array(
2125                                 'id'   => 'wpTextbox1',
2126                                 'name' => 'wpTextbox1',
2127                                 'cols' => $this->getUser()->getOption( 'cols' ),
2128                                 'rows' => $this->getUser()->getOption( 'rows' ),
2129                                 'readonly' => 'readonly',
2130                                 'lang' => $pageLang->getCode(),
2131                                 'dir' => $pageLang->getDir(),
2132                         );
2133                         $this->addHTML( Html::element( 'textarea', $params, $source ) );
2134
2135                         // Show templates used by this article
2136                         $article = new Article( $this->getTitle() );
2137                         $templates = Linker::formatTemplates( $article->getUsedTemplates() );
2138                         $this->addHTML( "<div class='templatesUsed'>
2139 $templates
2140 </div>
2141 " );
2142                 }
2143
2144                 # If the title doesn't exist, it's fairly pointless to print a return
2145                 # link to it.  After all, you just tried editing it and couldn't, so
2146                 # what's there to do there?
2147                 if( $this->getTitle()->exists() ) {
2148                         $this->returnToMain( null, $this->getTitle() );
2149                 }
2150         }
2151
2152         /**
2153          * Turn off regular page output and return an error reponse
2154          * for when rate limiting has triggered.
2155          */
2156         public function rateLimited() {
2157                 throw new ThrottledError;
2158         }
2159
2160         /**
2161          * Show a warning about slave lag
2162          *
2163          * If the lag is higher than $wgSlaveLagCritical seconds,
2164          * then the warning is a bit more obvious. If the lag is
2165          * lower than $wgSlaveLagWarning, then no warning is shown.
2166          *
2167          * @param $lag Integer: slave lag
2168          */
2169         public function showLagWarning( $lag ) {
2170                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
2171                 if( $lag >= $wgSlaveLagWarning ) {
2172                         $message = $lag < $wgSlaveLagCritical
2173                                 ? 'lag-warn-normal'
2174                                 : 'lag-warn-high';
2175                         $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
2176                         $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getLang()->formatNum( $lag ) ) );
2177                 }
2178         }
2179
2180         public function showFatalError( $message ) {
2181                 $this->prepareErrorPage( $this->msg( 'internalerror' ) );
2182
2183                 $this->addHTML( $message );
2184         }
2185
2186         public function showUnexpectedValueError( $name, $val ) {
2187                 $this->showFatalError( $this->msg( 'unexpected', $name, $val )->text() );
2188         }
2189
2190         public function showFileCopyError( $old, $new ) {
2191                 $this->showFatalError( $this->msg( 'filecopyerror', $old, $new )->text() );
2192         }
2193
2194         public function showFileRenameError( $old, $new ) {
2195                 $this->showFatalError( $this->msg( 'filerenameerror', $old, $new )->text() );
2196         }
2197
2198         public function showFileDeleteError( $name ) {
2199                 $this->showFatalError( $this->msg( 'filedeleteerror', $name )->text() );
2200         }
2201
2202         public function showFileNotFoundError( $name ) {
2203                 $this->showFatalError( $this->msg( 'filenotfound', $name )->text() );
2204         }
2205
2206         /**
2207          * Add a "return to" link pointing to a specified title
2208          *
2209          * @param $title Title to link
2210          * @param $query String query string
2211          * @param $text String text of the link (input is not escaped)
2212          */
2213         public function addReturnTo( $title, $query = array(), $text = null ) {
2214                 $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullURL() ) );
2215                 $link = $this->msg( 'returnto' )->rawParams(
2216                         Linker::link( $title, $text, array(), $query ) )->escaped();
2217                 $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
2218         }
2219
2220         /**
2221          * Add a "return to" link pointing to a specified title,
2222          * or the title indicated in the request, or else the main page
2223          *
2224          * @param $unused No longer used
2225          * @param $returnto Title or String to return to
2226          * @param $returntoquery String: query string for the return to link
2227          */
2228         public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
2229                 if ( $returnto == null ) {
2230                         $returnto = $this->getRequest()->getText( 'returnto' );
2231                 }
2232
2233                 if ( $returntoquery == null ) {
2234                         $returntoquery = $this->getRequest()->getText( 'returntoquery' );
2235                 }
2236
2237                 if ( $returnto === '' ) {
2238                         $returnto = Title::newMainPage();
2239                 }
2240
2241                 if ( is_object( $returnto ) ) {
2242                         $titleObj = $returnto;
2243                 } else {
2244                         $titleObj = Title::newFromText( $returnto );
2245                 }
2246                 if ( !is_object( $titleObj ) ) {
2247                         $titleObj = Title::newMainPage();
2248                 }
2249
2250                 $this->addReturnTo( $titleObj, $returntoquery );
2251         }
2252
2253         /**
2254          * @param $sk Skin The given Skin
2255          * @param $includeStyle Boolean: unused
2256          * @return String: The doctype, opening <html>, and head element.
2257          */
2258         public function headElement( Skin $sk, $includeStyle = true ) {
2259                 global $wgContLang, $wgUseTrackbacks;
2260                 $userdir = $this->getLang()->getDir();
2261                 $sitedir = $wgContLang->getDir();
2262
2263                 if ( $sk->commonPrintStylesheet() ) {
2264                         $this->addModuleStyles( 'mediawiki.legacy.wikiprintable' );
2265                 }
2266
2267                 $ret = Html::htmlHeader( array( 'lang' => $this->getLang()->getCode(), 'dir' => $userdir, 'class' => 'client-nojs' ) );
2268
2269                 if ( $this->getHTMLTitle() == '' ) {
2270                         $this->setHTMLTitle( $this->msg( 'pagetitle', $this->getPageTitle() ) );
2271                 }
2272
2273                 $openHead = Html::openElement( 'head' );
2274                 if ( $openHead ) {
2275                         # Don't bother with the newline if $head == ''
2276                         $ret .= "$openHead\n";
2277                 }
2278
2279                 $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
2280
2281                 $ret .= implode( "\n", array(
2282                         $this->getHeadLinks( null, true ),
2283                         $this->buildCssLinks(),
2284                         $this->getHeadScripts(),
2285                         $this->getHeadItems()
2286                 ) );
2287
2288                 if ( $wgUseTrackbacks && $this->isArticleRelated() ) {
2289                         $ret .= $this->getTitle()->trackbackRDF();
2290                 }
2291
2292                 $closeHead = Html::closeElement( 'head' );
2293                 if ( $closeHead ) {
2294                         $ret .= "$closeHead\n";
2295                 }
2296
2297                 $bodyAttrs = array();
2298
2299                 # Classes for LTR/RTL directionality support
2300                 $bodyAttrs['class'] = "mediawiki $userdir sitedir-$sitedir";
2301
2302                 if ( $this->getLang()->capitalizeAllNouns() ) {
2303                         # A <body> class is probably not the best way to do this . . .
2304                         $bodyAttrs['class'] .= ' capitalize-all-nouns';
2305                 }
2306                 $bodyAttrs['class'] .= ' ' . $sk->getPageClasses( $this->getTitle() );
2307                 $bodyAttrs['class'] .= ' skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
2308
2309                 $sk->addToBodyAttributes( $this, $bodyAttrs ); // Allow skins to add body attributes they need
2310                 wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
2311
2312                 $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
2313
2314                 return $ret;
2315         }
2316
2317         /**
2318          * Add the default ResourceLoader modules to this object
2319          */
2320         private function addDefaultModules() {
2321                 global $wgIncludeLegacyJavaScript, $wgUseAjax, $wgAjaxWatch, $wgEnableMWSuggest;
2322
2323                 // Add base resources
2324                 $this->addModules( array(
2325                         'mediawiki.user',
2326                         'mediawiki.util',
2327                         'mediawiki.page.startup',
2328                         'mediawiki.page.ready',
2329                 ) );
2330                 if ( $wgIncludeLegacyJavaScript ){
2331                         $this->addModules( 'mediawiki.legacy.wikibits' );
2332                 }
2333
2334                 // Add various resources if required
2335                 if ( $wgUseAjax ) {
2336                         $this->addModules( 'mediawiki.legacy.ajax' );
2337
2338                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
2339
2340                         if( $wgAjaxWatch && $this->getUser()->isLoggedIn() ) {
2341                                 $this->addModules( 'mediawiki.action.watch.ajax' );
2342                         }
2343
2344                         if ( $wgEnableMWSuggest && !$this->getUser()->getOption( 'disablesuggest', false ) ) {
2345                                 $this->addModules( 'mediawiki.legacy.mwsuggest' );
2346                         }
2347                 }
2348
2349                 if ( $this->getUser()->getBoolOption( 'editsectiononrightclick' ) ) {
2350                         $this->addModules( 'mediawiki.action.view.rightClickEdit' );
2351                 }
2352
2353                 # Crazy edit-on-double-click stuff
2354                 if ( $this->isArticle() && $this->getUser()->getOption( 'editondblclick' ) ) {
2355                         $this->addModules( 'mediawiki.action.view.dblClickEdit' );
2356                 }
2357         }
2358
2359         /**
2360          * Get a ResourceLoader object associated with this OutputPage
2361          *
2362          * @return ResourceLoader
2363          */
2364         public function getResourceLoader() {
2365                 if ( is_null( $this->mResourceLoader ) ) {
2366                         $this->mResourceLoader = new ResourceLoader();
2367                 }
2368                 return $this->mResourceLoader;
2369         }
2370
2371         /**
2372          * TODO: Document
2373          * @param $modules Array/string with the module name(s)
2374          * @param $only String ResourceLoaderModule TYPE_ class constant
2375          * @param $useESI boolean
2376          * @param $extraQuery Array with extra query parameters to add to each request. array( param => value )
2377          * @return string html <script> and <style> tags
2378          */
2379         protected function makeResourceLoaderLink( $modules, $only, $useESI = false, array $extraQuery = array() ) {
2380                 global $wgResourceLoaderUseESI, $wgResourceLoaderInlinePrivateModules;
2381
2382                 if ( !count( $modules ) ) {
2383                         return '';
2384                 }
2385
2386                 if ( count( $modules ) > 1 ) {
2387                         // Remove duplicate module requests
2388                         $modules = array_unique( (array) $modules );
2389                         // Sort module names so requests are more uniform
2390                         sort( $modules );
2391
2392                         if ( ResourceLoader::inDebugMode() ) {
2393                                 // Recursively call us for every item
2394                                 $links = '';
2395                                 foreach ( $modules as $name ) {
2396                                         $links .= $this->makeResourceLoaderLink( $name, $only, $useESI );
2397                                 }
2398                                 return $links;
2399                         }
2400                 }
2401
2402                 // Create keyed-by-group list of module objects from modules list
2403                 $groups = array();
2404                 $resourceLoader = $this->getResourceLoader();
2405                 foreach ( (array) $modules as $name ) {
2406                         $module = $resourceLoader->getModule( $name );
2407                         # Check that we're allowed to include this module on this page
2408                         if ( ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
2409                                         && $only == ResourceLoaderModule::TYPE_SCRIPTS )
2410                                 || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
2411                                         && $only == ResourceLoaderModule::TYPE_STYLES )
2412                                 )
2413                         {
2414                                 continue;
2415                         }
2416
2417                         $group = $module->getGroup();
2418                         if ( !isset( $groups[$group] ) ) {
2419                                 $groups[$group] = array();
2420                         }
2421                         $groups[$group][$name] = $module;
2422                 }
2423
2424                 $links = '';
2425                 foreach ( $groups as $group => $modules ) {
2426                         // Special handling for user-specific groups
2427                         $user = null;
2428                         if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
2429                                 $user = $this->getUser()->getName();
2430                         }
2431
2432                         // Create a fake request based on the one we are about to make so modules return
2433                         // correct timestamp and emptiness data
2434                         $query = ResourceLoader::makeLoaderQuery(
2435                                 array(), // modules; not determined yet
2436                                 $this->getLang()->getCode(),
2437                                 $this->getSkin()->getSkinName(),
2438                                 $user,
2439                                 null, // version; not determined yet
2440                                 ResourceLoader::inDebugMode(),
2441                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2442                                 $this->isPrintable(),
2443                                 $this->getRequest()->getBool( 'handheld' ),
2444                                 $extraQuery
2445                         );
2446                         $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
2447                         // Drop modules that know they're empty
2448                         foreach ( $modules as $key => $module ) {
2449                                 if ( $module->isKnownEmpty( $context ) ) {
2450                                         unset( $modules[$key] );
2451                                 }
2452                         }
2453                         // If there are no modules left, skip this group
2454                         if ( $modules === array() ) {
2455                                 continue;
2456                         }
2457
2458                         // Support inlining of private modules if configured as such
2459                         if ( $group === 'private' && $wgResourceLoaderInlinePrivateModules ) {
2460                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2461                                         $links .= Html::inlineStyle(
2462                                                 $resourceLoader->makeModuleResponse( $context, $modules )
2463                                         );
2464                                 } else {
2465                                         $links .= Html::inlineScript(
2466                                                 ResourceLoader::makeLoaderConditionalScript(
2467                                                         $resourceLoader->makeModuleResponse( $context, $modules )
2468                                                 )
2469                                         );
2470                                 }
2471                                 $links .= "\n";
2472                                 continue;
2473                         }
2474                         // Special handling for the user group; because users might change their stuff
2475                         // on-wiki like user pages, or user preferences; we need to find the highest
2476                         // timestamp of these user-changable modules so we can ensure cache misses on change
2477                         // This should NOT be done for the site group (bug 27564) because anons get that too
2478                         // and we shouldn't be putting timestamps in Squid-cached HTML
2479                         $version = null;
2480                         if ( $group === 'user' ) {
2481                                 // Get the maximum timestamp
2482                                 $timestamp = 1;
2483                                 foreach ( $modules as $module ) {
2484                                         $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
2485                                 }
2486                                 // Add a version parameter so cache will break when things change
2487                                 $version = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
2488                         }
2489
2490                         $url = ResourceLoader::makeLoaderURL(
2491                                 array_keys( $modules ),
2492                                 $this->getLang()->getCode(),
2493                                 $this->getSkin()->getSkinName(),
2494                                 $user,
2495                                 $version,
2496                                 ResourceLoader::inDebugMode(),
2497                                 $only === ResourceLoaderModule::TYPE_COMBINED ? null : $only,
2498                                 $this->isPrintable(),
2499                                 $this->getRequest()->getBool( 'handheld' ),
2500                                 $extraQuery
2501                         );
2502                         if ( $useESI && $wgResourceLoaderUseESI ) {
2503                                 $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
2504                                 if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
2505                                         $link = Html::inlineStyle( $esi );
2506                                 } else {
2507                                         $link = Html::inlineScript( $esi );
2508                                 }
2509                         } else {
2510                                 // Automatically select style/script elements
2511                                 if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
2512                                         $link = Html::linkedStyle( $url );
2513                                 } else {
2514                                         $link = Html::linkedScript( $url );
2515                                 }
2516                         }
2517
2518                         if( $group == 'noscript' ){
2519                                 $links .= Html::rawElement( 'noscript', array(), $link ) . "\n";
2520                         } else {
2521                                 $links .= $link . "\n";
2522                         }
2523                 }
2524                 return $links;
2525         }
2526
2527         /**
2528          * JS stuff to put in the <head>. This is the startup module, config
2529          * vars and modules marked with position 'top'
2530          *
2531          * @return String: HTML fragment
2532          */
2533         function getHeadScripts() {
2534                 // Startup - this will immediately load jquery and mediawiki modules
2535                 $scripts = $this->makeResourceLoaderLink( 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
2536
2537                 // Load config before anything else
2538                 $scripts .= Html::inlineScript(
2539                         ResourceLoader::makeLoaderConditionalScript(
2540                                 ResourceLoader::makeConfigSetScript( $this->getJSVars() )
2541                         )
2542                 );
2543
2544                 // Script and Messages "only" requests marked for top inclusion
2545                 // Messages should go first
2546                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'top' ), ResourceLoaderModule::TYPE_MESSAGES );
2547                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'top' ), ResourceLoaderModule::TYPE_SCRIPTS );
2548
2549                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2550                 // Only load modules that have marked themselves for loading at the top
2551                 $modules = $this->getModules( true, 'top' );
2552                 if ( $modules ) {
2553                         $scripts .= Html::inlineScript(
2554                                 ResourceLoader::makeLoaderConditionalScript(
2555                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2556                                 )
2557                         );
2558                 }
2559
2560                 return $scripts;
2561         }
2562
2563         /**
2564          * JS stuff to put at the bottom of the <body>: modules marked with position 'bottom',
2565          * legacy scripts ($this->mScripts), user preferences, site JS and user JS
2566          *
2567          * @return string
2568          */
2569         function getBottomScripts() {
2570                 global $wgUseSiteJs, $wgAllowUserJs;
2571
2572                 // Script and Messages "only" requests marked for bottom inclusion
2573                 // Messages should go first
2574                 $scripts = $this->makeResourceLoaderLink( $this->getModuleMessages( true, 'bottom' ), ResourceLoaderModule::TYPE_MESSAGES );
2575                 $scripts .= $this->makeResourceLoaderLink( $this->getModuleScripts( true, 'bottom' ), ResourceLoaderModule::TYPE_SCRIPTS );
2576
2577                 // Modules requests - let the client calculate dependencies and batch requests as it likes
2578                 // Only load modules that have marked themselves for loading at the bottom
2579                 $modules = $this->getModules( true, 'bottom' );
2580                 if ( $modules ) {
2581                         $scripts .= Html::inlineScript(
2582                                 ResourceLoader::makeLoaderConditionalScript(
2583                                         Xml::encodeJsCall( 'mw.loader.load', array( $modules ) )
2584                                 )
2585                         );
2586                 }
2587
2588                 // Legacy Scripts
2589                 $scripts .= "\n" . $this->mScripts;
2590
2591                 $userScripts = array( 'user.options', 'user.tokens' );
2592
2593                 // Add site JS if enabled
2594                 if ( $wgUseSiteJs ) {
2595                         $scripts .= $this->makeResourceLoaderLink( 'site', ResourceLoaderModule::TYPE_SCRIPTS );
2596                         if( $this->getUser()->isLoggedIn() ){
2597                                 $userScripts[] = 'user.groups';
2598                         }
2599                 }
2600
2601                 // Add user JS if enabled
2602                 if ( $wgAllowUserJs && $this->getUser()->isLoggedIn() ) {
2603                         if( $this->getTitle() && $this->getTitle()->isJsSubpage() && $this->userCanPreview() ) {
2604                                 # XXX: additional security check/prompt?
2605                                 // We're on a preview of a JS subpage
2606                                 // Exclude this page from the user module in case it's in there (bug 26283)
2607                                 $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS, false,
2608                                         array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
2609                                 );
2610                                 // Load the previewed JS
2611                                 $scripts .= Html::inlineScript( "\n" . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
2612                         } else {
2613                                 // Include the user module normally
2614                                 // We can't do $userScripts[] = 'user'; because the user module would end up
2615                                 // being wrapped in a closure, so load it raw like 'site'
2616                                 $scripts .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_SCRIPTS );
2617                         }
2618                 }
2619                 $scripts .= $this->makeResourceLoaderLink( $userScripts, ResourceLoaderModule::TYPE_COMBINED );
2620
2621                 return $scripts;
2622         }
2623
2624         /**
2625          * Add one or more variables to be set in mw.config in JavaScript.
2626          *
2627          * @param $key {String|Array} Key or array of key/value pars.
2628          * @param $value {Mixed} Value of the configuration variable.
2629          */
2630         public function addJsConfigVars( $keys, $value ) {
2631                 if ( is_array( $keys ) ) {
2632                         foreach ( $keys as $key => $value ) {
2633                                 $this->mJsConfigVars[$key] = $value;
2634                         }
2635                         return;
2636                 }
2637
2638                 $this->mJsConfigVars[$keys] = $value;
2639         }
2640
2641
2642         /**
2643          * Get an array containing the variables to be set in mw.config in JavaScript.
2644          *
2645          * Do not add things here which can be evaluated in ResourceLoaderStartupScript
2646          * - in other words, page-independent/site-wide variables (without state).
2647          * You will only be adding bloat to the html page and causing page caches to
2648          * have to be purged on configuration changes.
2649          */
2650         protected function getJSVars() {
2651                 global $wgUseAjax, $wgEnableMWSuggest;
2652
2653                 $title = $this->getTitle();
2654                 $ns = $title->getNamespace();
2655                 $nsname = MWNamespace::exists( $ns ) ? MWNamespace::getCanonicalName( $ns ) : $title->getNsText();
2656                 if ( $ns == NS_SPECIAL ) {
2657                         list( $canonicalName, /*...*/ ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
2658                 } else {
2659                         $canonicalName = false; # bug 21115
2660                 }
2661
2662                 $vars = array(
2663                         'wgCanonicalNamespace' => $nsname,
2664                         'wgCanonicalSpecialPageName' => $canonicalName,
2665                         'wgNamespaceNumber' => $title->getNamespace(),
2666                         'wgPageName' => $title->getPrefixedDBKey(),
2667                         'wgTitle' => $title->getText(),
2668                         'wgCurRevisionId' => $title->getLatestRevID(),
2669                         'wgArticleId' => $title->getArticleId(),
2670                         'wgIsArticle' => $this->isArticle(),
2671                         'wgAction' => $this->getRequest()->getText( 'action', 'view' ),
2672                         'wgUserName' => $this->getUser()->isAnon() ? null : $this->getUser()->getName(),
2673                         'wgUserGroups' => $this->getUser()->getEffectiveGroups(),
2674                         'wgCategories' => $this->getCategories(),
2675                         'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
2676                 );
2677                 $lang = $this->getTitle()->getPageLanguage();
2678                 if ( $lang->hasVariants() ) {
2679                         $vars['wgUserVariant'] = $lang->getPreferredVariant();
2680                 }
2681                 foreach ( $title->getRestrictionTypes() as $type ) {
2682                         $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
2683                 }
2684                 if ( $wgUseAjax && $wgEnableMWSuggest && !$this->getUser()->getOption( 'disablesuggest', false ) ) {
2685                         $vars['wgSearchNamespaces'] = SearchEngine::userNamespaces( $this->getUser() );
2686                 }
2687                 if ( $title->isMainPage() ) {
2688                         $vars['wgIsMainPage'] = true;
2689                 }
2690
2691                 // Allow extensions to add their custom variables to the mw.config map.
2692                 // Use the 'ResourceLoaderGetConfigVars' hook if the variable is not
2693                 // page-dependant but site-wide (without state).
2694                 // Alternatively, you may want to use OutputPage->addJsConfigVars() instead.
2695                 wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars, &$this ) );
2696
2697                 // Merge in variables from addJsConfigVars last
2698                 return array_merge( $vars, $this->mJsConfigVars );
2699         }
2700
2701         /**
2702          * To make it harder for someone to slip a user a fake
2703          * user-JavaScript or user-CSS preview, a random token
2704          * is associated with the login session. If it's not
2705          * passed back with the preview request, we won't render
2706          * the code.
2707          *
2708          * @return bool
2709          */
2710         public function userCanPreview() {
2711                 if ( $this->getRequest()->getVal( 'action' ) != 'submit'
2712                         || !$this->getRequest()->wasPosted()
2713                         || !$this->getUser()->matchEditToken(
2714                                 $this->getRequest()->getVal( 'wpEditToken' ) )
2715                 ) {
2716                         return false;
2717                 }
2718                 if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
2719                         return false;
2720                 }
2721
2722                 return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
2723         }
2724
2725         /**
2726          * @param $unused Unused
2727          * @param $addContentType bool
2728          *
2729          * @return string HTML tag links to be put in the header.
2730          */
2731         public function getHeadLinks( $unused = null, $addContentType = false ) {
2732                 global $wgUniversalEditButton, $wgFavicon, $wgAppleTouchIcon, $wgEnableAPI,
2733                         $wgSitename, $wgVersion, $wgHtml5, $wgMimeType,
2734                         $wgFeed, $wgOverrideSiteFeed, $wgAdvertisedFeedTypes,
2735                         $wgDisableLangConversion, $wgCanonicalLanguageLinks,
2736                         $wgRightsPage, $wgRightsUrl;
2737
2738                 $tags = array();
2739
2740                 if ( $addContentType ) {
2741                         if ( $wgHtml5 ) {
2742                                 # More succinct than <meta http-equiv=Content-Type>, has the
2743                                 # same effect
2744                                 $tags[] = Html::element( 'meta', array( 'charset' => 'UTF-8' ) );
2745                         } else {
2746                                 $tags[] = Html::element( 'meta', array(
2747                                         'http-equiv' => 'Content-Type',
2748                                         'content' => "$wgMimeType; charset=UTF-8"
2749                                 ) );
2750                                 $tags[] = Html::element( 'meta', array(  // bug 15835
2751                                         'http-equiv' => 'Content-Style-Type',
2752                                         'content' => 'text/css'
2753                                 ) );
2754                         }
2755                 }
2756
2757                 $tags[] = Html::element( 'meta', array(
2758                         'name' => 'generator',
2759                         'content' => "MediaWiki $wgVersion",
2760                 ) );
2761
2762                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
2763                 if( $p !== 'index,follow' ) {
2764                         // http://www.robotstxt.org/wc/meta-user.html
2765                         // Only show if it's different from the default robots policy
2766                         $tags[] = Html::element( 'meta', array(
2767                                 'name' => 'robots',
2768                                 'content' => $p,
2769                         ) );
2770                 }
2771
2772                 if ( count( $this->mKeywords ) > 0 ) {
2773                         $strip = array(
2774                                 "/<.*?" . ">/" => '',
2775                                 "/_/" => ' '
2776                         );
2777                         $tags[] = Html::element( 'meta', array(
2778                                 'name' => 'keywords',
2779                                 'content' =>  preg_replace(
2780                                         array_keys( $strip ),
2781                                         array_values( $strip ),
2782                                         implode( ',', $this->mKeywords )
2783                                 )
2784                         ) );
2785                 }
2786
2787                 foreach ( $this->mMetatags as $tag ) {
2788                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
2789                                 $a = 'http-equiv';
2790                                 $tag[0] = substr( $tag[0], 5 );
2791                         } else {
2792                                 $a = 'name';
2793                         }
2794                         $tags[] = Html::element( 'meta',
2795                                 array(
2796                                         $a => $tag[0],
2797                                         'content' => $tag[1]
2798                                 )
2799                         );
2800                 }
2801
2802                 foreach ( $this->mLinktags as $tag ) {
2803                         $tags[] = Html::element( 'link', $tag );
2804                 }
2805
2806                 # Universal edit button
2807                 if ( $wgUniversalEditButton ) {
2808                         if ( $this->isArticleRelated() && $this->getTitle() && $this->getTitle()->quickUserCan( 'edit' )
2809                                 && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create' ) ) ) {
2810                                 // Original UniversalEditButton
2811                                 $msg = $this->msg( 'edit' )->text();
2812                                 $tags[] = Html::element( 'link', array(
2813                                         'rel' => 'alternate',
2814                                         'type' => 'application/x-wiki',
2815                                         'title' => $msg,
2816                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
2817                                 ) );
2818                                 // Alternate edit link
2819                                 $tags[] = Html::element( 'link', array(
2820                                         'rel' => 'edit',
2821                                         'title' => $msg,
2822                                         'href' => $this->getTitle()->getLocalURL( 'action=edit' )
2823                                 ) );
2824                         }
2825                 }
2826
2827                 # Generally the order of the favicon and apple-touch-icon links
2828                 # should not matter, but Konqueror (3.5.9 at least) incorrectly
2829                 # uses whichever one appears later in the HTML source. Make sure
2830                 # apple-touch-icon is specified first to avoid this.
2831                 if ( $wgAppleTouchIcon !== false ) {
2832                         $tags[] = Html::element( 'link', array( 'rel' => 'apple-touch-icon', 'href' => $wgAppleTouchIcon ) );
2833                 }
2834
2835                 if ( $wgFavicon !== false ) {
2836                         $tags[] = Html::element( 'link', array( 'rel' => 'shortcut icon', 'href' => $wgFavicon ) );
2837                 }
2838
2839                 # OpenSearch description link
2840                 $tags[] = Html::element( 'link', array(
2841                         'rel' => 'search',
2842                         'type' => 'application/opensearchdescription+xml',
2843                         'href' => wfScript( 'opensearch_desc' ),
2844                         'title' => $this->msg( 'opensearch-desc' )->inContentLanguage()->text(),
2845                 ) );
2846
2847                 if ( $wgEnableAPI ) {
2848                         # Real Simple Discovery link, provides auto-discovery information
2849                         # for the MediaWiki API (and potentially additional custom API
2850                         # support such as WordPress or Twitter-compatible APIs for a
2851                         # blogging extension, etc)
2852                         $tags[] = Html::element( 'link', array(
2853                                 'rel' => 'EditURI',
2854                                 'type' => 'application/rsd+xml',
2855                                 // Output a protocol-relative URL here if $wgServer is protocol-relative
2856                                 // Whether RSD accepts relative or protocol-relative URLs is completely undocumented, though
2857                                 'href' => wfExpandUrl( wfAppendQuery( wfScript( 'api' ), array( 'action' => 'rsd' ) ), PROTO_RELATIVE ),
2858                         ) );
2859                 }
2860
2861                 $lang = $this->getTitle()->getPageLanguage();
2862
2863                 # Language variants
2864                 if ( !$wgDisableLangConversion && $wgCanonicalLanguageLinks
2865                         && $lang->hasVariants() ) {
2866
2867                         $urlvar = $lang->getURLVariant();
2868
2869                         if ( !$urlvar ) {
2870                                 $variants = $lang->getVariants();
2871                                 foreach ( $variants as $_v ) {
2872                                         $tags[] = Html::element( 'link', array(
2873                                                 'rel' => 'alternate',
2874                                                 'hreflang' => $_v,
2875                                                 'href' => $this->getTitle()->getLocalURL( '', $_v ) )
2876                                         );
2877                                 }
2878                         } else {
2879                                 $tags[] = Html::element( 'link', array(
2880                                         'rel' => 'canonical',
2881                                         'href' => $this->getTitle()->getCanonicalUrl()
2882                                 ) );
2883                         }
2884                 }
2885
2886                 # Copyright
2887                 $copyright = '';
2888                 if ( $wgRightsPage ) {
2889                         $copy = Title::newFromText( $wgRightsPage );
2890
2891                         if ( $copy ) {
2892                                 $copyright = $copy->getLocalURL();
2893                         }
2894                 }
2895
2896                 if ( !$copyright && $wgRightsUrl ) {
2897                         $copyright = $wgRightsUrl;
2898                 }
2899
2900                 if ( $copyright ) {
2901                         $tags[] = Html::element( 'link', array(
2902                                 'rel' => 'copyright',
2903                                 'href' => $copyright )
2904                         );
2905                 }
2906
2907                 # Feeds
2908                 if ( $wgFeed ) {
2909                         foreach( $this->getSyndicationLinks() as $format => $link ) {
2910                                 # Use the page name for the title.  In principle, this could
2911                                 # lead to issues with having the same name for different feeds
2912                                 # corresponding to the same page, but we can't avoid that at
2913                                 # this low a level.
2914
2915                                 $tags[] = $this->feedLink(
2916                                         $format,
2917                                         $link,
2918                                         # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
2919                                         $this->msg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )->text()
2920                                 );
2921                         }
2922
2923                         # Recent changes feed should appear on every page (except recentchanges,
2924                         # that would be redundant). Put it after the per-page feed to avoid
2925                         # changing existing behavior. It's still available, probably via a
2926                         # menu in your browser. Some sites might have a different feed they'd
2927                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
2928                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
2929                         # If so, use it instead.
2930
2931                         $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
2932
2933                         if ( $wgOverrideSiteFeed ) {
2934                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
2935                                         // Note, this->feedLink escapes the url.
2936                                         $tags[] = $this->feedLink(
2937                                                 $type,
2938                                                 $feedUrl,
2939                                                 $this->msg( "site-{$type}-feed", $wgSitename )->text()
2940                                         );
2941                                 }
2942                         } elseif ( $this->getTitle()->getPrefixedText() != $rctitle->getPrefixedText() ) {
2943                                 foreach ( $wgAdvertisedFeedTypes as $format ) {
2944                                         $tags[] = $this->feedLink(
2945                                                 $format,
2946                                                 $rctitle->getLocalURL( "feed={$format}" ),
2947                                                 $this->msg( "site-{$format}-feed", $wgSitename )->text() # For grep: 'site-rss-feed', 'site-atom-feed'.
2948                                         );
2949                                 }
2950                         }
2951                 }
2952                 return implode( "\n", $tags );
2953         }
2954
2955         /**
2956          * Generate a <link rel/> for a feed.
2957          *
2958          * @param $type String: feed type
2959          * @param $url String: URL to the feed
2960          * @param $text String: value of the "title" attribute
2961          * @return String: HTML fragment
2962          */
2963         private function feedLink( $type, $url, $text ) {
2964                 return Html::element( 'link', array(
2965                         'rel' => 'alternate',
2966                         'type' => "application/$type+xml",
2967                         'title' => $text,
2968                         'href' => $url )
2969                 );
2970         }
2971
2972         /**
2973          * Add a local or specified stylesheet, with the given media options.
2974          * Meant primarily for internal use...
2975          *
2976          * @param $style String: URL to the file
2977          * @param $media String: to specify a media type, 'screen', 'printable', 'handheld' or any.
2978          * @param $condition String: for IE conditional comments, specifying an IE version
2979          * @param $dir String: set to 'rtl' or 'ltr' for direction-specific sheets
2980          */
2981         public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
2982                 $options = array();
2983                 // Even though we expect the media type to be lowercase, but here we
2984                 // force it to lowercase to be safe.
2985                 if( $media ) {
2986                         $options['media'] = $media;
2987                 }
2988                 if( $condition ) {
2989                         $options['condition'] = $condition;
2990                 }
2991                 if( $dir ) {
2992                         $options['dir'] = $dir;
2993                 }
2994                 $this->styles[$style] = $options;
2995         }
2996
2997         /**
2998          * Adds inline CSS styles
2999          * @param $style_css Mixed: inline CSS
3000          * @param $flip String: Set to 'flip' to flip the CSS if needed
3001          */
3002         public function addInlineStyle( $style_css, $flip = 'noflip' ) {
3003                 if( $flip === 'flip' && $this->getLang()->isRTL() ) {
3004                         # If wanted, and the interface is right-to-left, flip the CSS
3005                         $style_css = CSSJanus::transform( $style_css, true, false );
3006                 }
3007                 $this->mInlineStyles .= Html::inlineStyle( $style_css );
3008         }
3009
3010         /**
3011          * Build a set of <link>s for the stylesheets specified in the $this->styles array.
3012          * These will be applied to various media & IE conditionals.
3013          *
3014          * @return string
3015          */
3016         public function buildCssLinks() {
3017                 global $wgUseSiteCss, $wgAllowUserCss, $wgAllowUserCssPrefs;
3018
3019                 $this->getSkin()->setupSkinUserCss( $this );
3020
3021                 // Add ResourceLoader styles
3022                 // Split the styles into four groups
3023                 $styles = array( 'other' => array(), 'user' => array(), 'site' => array(), 'private' => array(), 'noscript' => array() );
3024                 $otherTags = ''; // Tags to append after the normal <link> tags
3025                 $resourceLoader = $this->getResourceLoader();
3026
3027                 $moduleStyles = $this->getModuleStyles();
3028
3029                 // Per-site custom styles
3030                 if ( $wgUseSiteCss ) {
3031                         $moduleStyles[] = 'site';
3032                         $moduleStyles[] = 'noscript';
3033                         if( $this->getUser()->isLoggedIn() ){
3034                                 $moduleStyles[] = 'user.groups';
3035                         }
3036                 }
3037
3038                 // Per-user custom styles
3039                 if ( $wgAllowUserCss ) {
3040                         if ( $this->getTitle()->isCssSubpage() && $this->userCanPreview() ) {
3041                                 // We're on a preview of a CSS subpage
3042                                 // Exclude this page from the user module in case it's in there (bug 26283)
3043                                 $otherTags .= $this->makeResourceLoaderLink( 'user', ResourceLoaderModule::TYPE_STYLES, false,
3044                                         array( 'excludepage' => $this->getTitle()->getPrefixedDBkey() )
3045                                 );
3046                                 // Load the previewed CSS
3047                                 $otherTags .= Html::inlineStyle( $this->getRequest()->getText( 'wpTextbox1' ) );
3048                         } else {
3049                                 // Load the user styles normally
3050                                 $moduleStyles[] = 'user';
3051                         }
3052                 }
3053
3054                 // Per-user preference styles
3055                 if ( $wgAllowUserCssPrefs ) {
3056                         $moduleStyles[] = 'user.options';
3057                 }
3058
3059                 foreach ( $moduleStyles as $name ) {
3060                         $group = $resourceLoader->getModule( $name )->getGroup();
3061                         // Modules in groups named "other" or anything different than "user", "site" or "private"
3062                         // will be placed in the "other" group
3063                         $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
3064                 }
3065
3066                 // We want site, private and user styles to override dynamically added styles from modules, but we want
3067                 // dynamically added styles to override statically added styles from other modules. So the order
3068                 // has to be other, dynamic, site, private, user
3069                 // Add statically added styles for other modules
3070                 $ret = $this->makeResourceLoaderLink( $styles['other'], ResourceLoaderModule::TYPE_STYLES );
3071                 // Add normal styles added through addStyle()/addInlineStyle() here
3072                 $ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
3073                 // Add marker tag to mark the place where the client-side loader should inject dynamic styles
3074                 // We use a <meta> tag with a made-up name for this because that's valid HTML
3075                 $ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) ) . "\n";
3076
3077                 // Add site, private and user styles
3078                 // 'private' at present only contains user.options, so put that before 'user'
3079                 // Any future private modules will likely have a similar user-specific character
3080                 foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
3081                         $ret .= $this->makeResourceLoaderLink( $styles[$group],
3082                                         ResourceLoaderModule::TYPE_STYLES
3083                         );
3084                 }
3085
3086                 // Add stuff in $otherTags (previewed user CSS if applicable)
3087                 $ret .= $otherTags;
3088                 return $ret;
3089         }
3090
3091         /**
3092          * @return Array
3093          */
3094         public function buildCssLinksArray() {
3095                 $links = array();
3096
3097                 // Add any extension CSS
3098                 foreach ( $this->mExtStyles as $url ) {
3099                         $this->addStyle( $url );
3100                 }
3101                 $this->mExtStyles = array();
3102
3103                 foreach( $this->styles as $file => $options ) {
3104                         $link = $this->styleLink( $file, $options );
3105                         if( $link ) {
3106                                 $links[$file] = $link;
3107                         }
3108                 }
3109                 return $links;
3110         }
3111
3112         /**
3113          * Generate \<link\> tags for stylesheets
3114          *
3115          * @param $style String: URL to the file
3116          * @param $options Array: option, can contain 'condition', 'dir', 'media'
3117          *                 keys
3118          * @return String: HTML fragment
3119          */
3120         protected function styleLink( $style, $options ) {
3121                 if( isset( $options['dir'] ) ) {
3122                         if( $this->getLang()->getDir() != $options['dir'] ) {
3123                                 return '';
3124                         }
3125                 }
3126
3127                 if( isset( $options['media'] ) ) {
3128                         $media = self::transformCssMedia( $options['media'] );
3129                         if( is_null( $media ) ) {
3130                                 return '';
3131                         }
3132                 } else {
3133                         $media = 'all';
3134                 }
3135
3136                 if( substr( $style, 0, 1 ) == '/' ||
3137                         substr( $style, 0, 5 ) == 'http:' ||
3138                         substr( $style, 0, 6 ) == 'https:' ) {
3139                         $url = $style;
3140                 } else {
3141                         global $wgStylePath, $wgStyleVersion;
3142                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
3143                 }
3144
3145                 $link = Html::linkedStyle( $url, $media );
3146
3147                 if( isset( $options['condition'] ) ) {
3148                         $condition = htmlspecialchars( $options['condition'] );
3149                         $link = "<!--[if $condition]>$link<![endif]-->";
3150                 }
3151                 return $link;
3152         }
3153
3154         /**
3155          * Transform "media" attribute based on request parameters
3156          *
3157          * @param $media String: current value of the "media" attribute
3158          * @return String: modified value of the "media" attribute
3159          */
3160         public static function transformCssMedia( $media ) {
3161                 global $wgRequest, $wgHandheldForIPhone;
3162
3163                 // Switch in on-screen display for media testing
3164                 $switches = array(
3165                         'printable' => 'print',
3166                         'handheld' => 'handheld',
3167                 );
3168                 foreach( $switches as $switch => $targetMedia ) {
3169                         if( $wgRequest->getBool( $switch ) ) {
3170                                 if( $media == $targetMedia ) {
3171                                         $media = '';
3172                                 } elseif( $media == 'screen' ) {
3173                                         return null;
3174                                 }
3175                         }
3176                 }
3177
3178                 // Expand longer media queries as iPhone doesn't grok 'handheld'
3179                 if( $wgHandheldForIPhone ) {
3180                         $mediaAliases = array(
3181                                 'screen' => 'screen and (min-device-width: 481px)',
3182                                 'handheld' => 'handheld, only screen and (max-device-width: 480px)',
3183                         );
3184
3185                         if( isset( $mediaAliases[$media] ) ) {
3186                                 $media = $mediaAliases[$media];
3187                         }
3188                 }
3189
3190                 return $media;
3191         }
3192
3193         /**
3194          * Add a wikitext-formatted message to the output.
3195          * This is equivalent to:
3196          *
3197          *    $wgOut->addWikiText( wfMsgNoTrans( ... ) )
3198          */
3199         public function addWikiMsg( /*...*/ ) {
3200                 $args = func_get_args();
3201                 $name = array_shift( $args );
3202                 $this->addWikiMsgArray( $name, $args );
3203         }
3204
3205         /**
3206          * Add a wikitext-formatted message to the output.
3207          * Like addWikiMsg() except the parameters are taken as an array
3208          * instead of a variable argument list.
3209          *
3210          * @param $name string
3211          * @param $args array
3212          */
3213         public function addWikiMsgArray( $name, $args ) {
3214                 $this->addWikiText( $this->msg( $name, $args )->plain() );
3215         }
3216
3217         /**
3218          * This function takes a number of message/argument specifications, wraps them in
3219          * some overall structure, and then parses the result and adds it to the output.
3220          *
3221          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
3222          * on. The subsequent arguments may either be strings, in which case they are the
3223          * message names, or arrays, in which case the first element is the message name,
3224          * and subsequent elements are the parameters to that message.
3225          *
3226          * The special named parameter 'options' in a message specification array is passed
3227          * through to the $options parameter of wfMsgExt().
3228          *
3229          * Don't use this for messages that are not in users interface language.
3230          *
3231          * For example:
3232          *
3233          *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
3234          *
3235          * Is equivalent to:
3236          *
3237          *    $wgOut->addWikiText( "<div class='error'>\n" . wfMsgNoTrans( 'some-error' ) . "\n</div>" );
3238          *
3239          * The newline after opening div is needed in some wikitext. See bug 19226.
3240          *
3241          * @param $wrap string
3242          */
3243         public function wrapWikiMsg( $wrap /*, ...*/ ) {
3244                 $msgSpecs = func_get_args();
3245                 array_shift( $msgSpecs );
3246                 $msgSpecs = array_values( $msgSpecs );
3247                 $s = $wrap;
3248                 foreach ( $msgSpecs as $n => $spec ) {
3249                         $options = array();
3250                         if ( is_array( $spec ) ) {
3251                                 $args = $spec;
3252                                 $name = array_shift( $args );
3253                                 if ( isset( $args['options'] ) ) {
3254                                         $options = $args['options'];
3255                                         unset( $args['options'] );
3256                                 }
3257                         }  else {
3258                                 $args = array();
3259                                 $name = $spec;
3260                         }
3261                         $s = str_replace( '$' . ( $n + 1 ), wfMsgExt( $name, $options, $args ), $s );
3262                 }
3263                 $this->addWikiText( $s );
3264         }
3265
3266         /**
3267          * Include jQuery core. Use this to avoid loading it multiple times
3268          * before we get a usable script loader.
3269          *
3270          * @param $modules Array: list of jQuery modules which should be loaded
3271          * @return Array: the list of modules which were not loaded.
3272          * @since 1.16
3273          * @deprecated since 1.17
3274          */
3275         public function includeJQuery( $modules = array() ) {
3276                 return array();
3277         }
3278
3279 }