includes/OutputPage.php

   1 <?php
   2 if ( ! defined( 'MEDIAWIKI' ) )
   3         die( 1 );
   4
   5 /**
   6  * @todo document
   7  */
   8 class OutputPage {
   9         var $mMetatags = array(), $mKeywords = array(), $mLinktags = array();
  10         var $mExtStyles = array();
  11         var $mPagetitle = '', $mBodytext = '', $mDebugtext = '';
  12         var $mHTMLtitle = '', $mIsarticle = true, $mPrintable = false;
  13         var $mSubtitle = '', $mRedirect = '', $mStatusCode;
  14         var $mLastModified = '', $mETag = false;
  15         var $mCategoryLinks = array(), $mLanguageLinks = array();
  16         var $mScripts = '', $mLinkColours, $mPageLinkTitle = '', $mHeadItems = array();
  17         var $mTemplateIds = array();
  18
  19         var $mAllowUserJs;
  20         var $mSuppressQuickbar = false;
  21         var $mOnloadHandler = '';
  22         var $mDoNothing = false;
  23         var $mContainsOldMagic = 0, $mContainsNewMagic = 0;
  24         var $mIsArticleRelated = true;
  25         protected $mParserOptions = null; // lazy initialised, use parserOptions()
  26         var $mShowFeedLinks = false;
  27         var $mFeedLinksAppendQuery = false;
  28         var $mEnableClientCache = true;
  29         var $mArticleBodyOnly = false;
  30
  31         var $mNewSectionLink = false;
  32         var $mHideNewSectionLink = false;
  33         var $mNoGallery = false;
  34         var $mPageTitleActionText = '';
  35         var $mParseWarnings = array();
  36         var $mSquidMaxage = 0;
  37         var $mRevisionId = null;
  38
  39         /**
  40          * An array of stylesheet filenames (relative from skins path), with options
  41          * for CSS media, IE conditions, and RTL/LTR direction.
  42          * For internal use; add settings in the skin via $this->addStyle()
  43          */
  44         var $styles = array();
  45
  46         private $mIndexPolicy = 'index';
  47         private $mFollowPolicy = 'follow';
  48
  49         /**
  50          * Constructor
  51          * Initialise private variables
  52          */
  53         function __construct() {
  54                 global $wgAllowUserJs;
  55                 $this->mAllowUserJs = $wgAllowUserJs;
  56         }
  57
  58         public function redirect( $url, $responsecode = '302' ) {
  59                 # Strip newlines as a paranoia check for header injection in PHP<5.1.2
  60                 $this->mRedirect = str_replace( "\n", '', $url );
  61                 $this->mRedirectCode = $responsecode;
  62         }
  63
  64         public function getRedirect() {
  65                 return $this->mRedirect;
  66         }
  67
  68         /**
  69          * Set the HTTP status code to send with the output.
  70          *
  71          * @param int $statusCode
  72          * @return nothing
  73          */
  74         function setStatusCode( $statusCode ) { $this->mStatusCode = $statusCode; }
  75
  76         /**
  77          * Add a new <meta> tag
  78          * To add an http-equiv meta tag, precede the name with "http:"
  79          *
  80          * @param $name tag name
  81          * @param $val tag value
  82          */
  83         function addMeta( $name, $val ) {
  84                 array_push( $this->mMetatags, array( $name, $val ) );
  85         }
  86
  87         function addKeyword( $text ) { array_push( $this->mKeywords, $text ); }
  88         function addScript( $script ) { $this->mScripts .= "\t\t".$script; }
  89
  90         function addExtensionStyle( $url ) {
  91                 $linkarr = array( 'rel' => 'stylesheet', 'href' => $url, 'type' => 'text/css' );
  92                 array_push( $this->mExtStyles, $linkarr );
  93         }
  94
  95         /**
  96          * Add a JavaScript file out of skins/common, or a given relative path.
  97          * @param string $file filename in skins/common or complete on-server path (/foo/bar.js)
  98          */
  99         function addScriptFile( $file ) {
 100                 global $wgStylePath, $wgStyleVersion, $wgJsMimeType;
 101                 if( substr( $file, 0, 1 ) == '/' ) {
 102                         $path = $file;
 103                 } else {
 104                         $path =  "{$wgStylePath}/common/{$file}";
 105                 }
 106                 $this->addScript( "<script type=\"{$wgJsMimeType}\" src=\"$path?$wgStyleVersion\"></script>\n" );
 107         }
 108
 109         /**
 110          * Add a self-contained script tag with the given contents
 111          * @param string $script JavaScript text, no <script> tags
 112          */
 113         function addInlineScript( $script ) {
 114                 global $wgJsMimeType;
 115                 $this->mScripts .= "<script type=\"$wgJsMimeType\">/*<![CDATA[*/\n$script\n/*]]>*/</script>";
 116         }
 117
 118         function getScript() {
 119                 return $this->mScripts . $this->getHeadItems();
 120         }
 121
 122         function getHeadItems() {
 123                 $s = '';
 124                 foreach ( $this->mHeadItems as $item ) {
 125                         $s .= $item;
 126                 }
 127                 return $s;
 128         }
 129
 130         function addHeadItem( $name, $value ) {
 131                 $this->mHeadItems[$name] = $value;
 132         }
 133
 134         function hasHeadItem( $name ) {
 135                 return isset( $this->mHeadItems[$name] );
 136         }
 137
 138         function setETag($tag) { $this->mETag = $tag; }
 139         function setArticleBodyOnly($only) { $this->mArticleBodyOnly = $only; }
 140         function getArticleBodyOnly($only) { return $this->mArticleBodyOnly; }
 141
 142         function addLink( $linkarr ) {
 143                 # $linkarr should be an associative array of attributes. We'll escape on output.
 144                 array_push( $this->mLinktags, $linkarr );
 145         }
 146
 147         # Get all links added by extensions
 148         function getExtStyle() {
 149                 return $this->mExtStyles;
 150         }
 151
 152         function addMetadataLink( $linkarr ) {
 153                 # note: buggy CC software only reads first "meta" link
 154                 static $haveMeta = false;
 155                 $linkarr['rel'] = ($haveMeta) ? 'alternate meta' : 'meta';
 156                 $this->addLink( $linkarr );
 157                 $haveMeta = true;
 158         }
 159
 160         /**
 161          * checkLastModified tells the client to use the client-cached page if
 162          * possible. If sucessful, the OutputPage is disabled so that
 163          * any future call to OutputPage->output() have no effect.
 164          *
 165          * Side effect: sets mLastModified for Last-Modified header
 166          *
 167          * @return bool True iff cache-ok headers was sent.
 168          */
 169         function checkLastModified( $timestamp ) {
 170                 global $wgCachePages, $wgCacheEpoch, $wgUser, $wgRequest;
 171
 172                 if ( !$timestamp || $timestamp == '19700101000000' ) {
 173                         wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
 174                         return false;
 175                 }
 176                 if( !$wgCachePages ) {
 177                         wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
 178                         return false;
 179                 }
 180                 if( $wgUser->getOption( 'nocache' ) ) {
 181                         wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
 182                         return false;
 183                 }
 184
 185                 $timestamp = wfTimestamp( TS_MW, $timestamp );
 186                 $modifiedTimes = array(
 187                         'page' => $timestamp,
 188                         'user' => $wgUser->getTouched(),
 189                         'epoch' => $wgCacheEpoch
 190                 );
 191                 wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
 192
 193                 $maxModified = max( $modifiedTimes );
 194                 $this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );
 195
 196                 if( empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
 197                         wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );
 198                         return false;
 199                 }
 200
 201                 # Make debug info
 202                 $info = '';
 203                 foreach ( $modifiedTimes as $name => $value ) {
 204                         if ( $info !== '' ) {
 205                                 $info .= ', ';
 206                         }
 207                         $info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );
 208                 }
 209
 210                 # IE sends sizes after the date like this:
 211                 # Wed, 20 Aug 2003 06:51:19 GMT; length=5202
 212                 # this breaks strtotime().
 213                 $clientHeader = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
 214
 215                 wfSuppressWarnings(); // E_STRICT system time bitching
 216                 $clientHeaderTime = strtotime( $clientHeader );
 217                 wfRestoreWarnings();
 218                 if ( !$clientHeaderTime ) {
 219                         wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );
 220                         return false;
 221                 }
 222                 $clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );
 223
 224                 wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .
 225                         wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );
 226                 wfDebug( __METHOD__ . ": effective Last-Modified: " .
 227                         wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );
 228                 if( $clientHeaderTime < $maxModified ) {
 229                         wfDebug( __METHOD__ . ": STALE, $info\n", false );
 230                         return false;
 231                 }
 232
 233                 # Not modified
 234                 # Give a 304 response code and disable body output
 235                 wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
 236                 ini_set('zlib.output_compression', 0);
 237                 $wgRequest->response()->header( "HTTP/1.1 304 Not Modified" );
 238                 $this->sendCacheControl();
 239                 $this->disable();
 240
 241                 // Don't output a compressed blob when using ob_gzhandler;
 242                 // it's technically against HTTP spec and seems to confuse
 243                 // Firefox when the response gets split over two packets.
 244                 wfClearOutputBuffers();
 245
 246                 return true;
 247         }
 248
 249         function setPageTitleActionText( $text ) {
 250                 $this->mPageTitleActionText = $text;
 251         }
 252
 253         function getPageTitleActionText () {
 254                 if ( isset( $this->mPageTitleActionText ) ) {
 255                         return $this->mPageTitleActionText;
 256                 }
 257         }
 258
 259         /**
 260          * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
 261          *
 262          * @param $policy string The literal string to output as the contents of
 263          *   the meta tag.  Will be parsed according to the spec and output in
 264          *   standardized form.
 265          * @return null
 266          */
 267         public function setRobotPolicy( $policy ) {
 268                 $policy = explode( ',', $policy );
 269                 $policy = array_map( 'trim', $policy );
 270
 271                 # The default policy is follow, so if nothing is said explicitly, we
 272                 # do that.
 273                 if( in_array( 'nofollow', $policy ) ) {
 274                         $this->mFollowPolicy = 'nofollow';
 275                 } else {
 276                         $this->mFollowPolicy = 'follow';
 277                 }
 278
 279                 if( in_array( 'noindex', $policy ) ) {
 280                         $this->mIndexPolicy = 'noindex';
 281                 } else {
 282                         $this->mIndexPolicy = 'index';
 283                 }
 284         }
 285
 286         /**
 287          * Set the index policy for the page, but leave the follow policy un-
 288          * touched.
 289          *
 290          * @param $policy string Either 'index' or 'noindex'.
 291          * @return null
 292          */
 293         public function setIndexPolicy( $policy ) {
 294                 $policy = trim( $policy );
 295                 if( in_array( $policy, array( 'index', 'noindex' ) ) ) {
 296                         $this->mIndexPolicy = $policy;
 297                 }
 298         }
 299
 300         /**
 301          * Set the follow policy for the page, but leave the index policy un-
 302          * touched.
 303          *
 304          * @param $policy string Either 'follow' or 'nofollow'.
 305          * @return null
 306          */
 307         public function setFollowPolicy( $policy ) {
 308                 $policy = trim( $policy );
 309                 if( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {
 310                         $this->mFollowPolicy = $policy;
 311                 }
 312         }
 313
 314         public function setHTMLTitle( $name ) { $this->mHTMLtitle = $name; }
 315         public function setPageTitle( $name ) {
 316                 global $wgContLang;
 317                 $name = $wgContLang->convert( $name, true );
 318                 $this->mPagetitle = $name;
 319
 320                 $taction =  $this->getPageTitleActionText();
 321                 if( !empty( $taction ) ) {
 322                         $name .= ' - '.$taction;
 323                 }
 324
 325                 $this->setHTMLTitle( wfMsg( 'pagetitle', $name ) );
 326         }
 327
 328         public function getHTMLTitle() { return $this->mHTMLtitle; }
 329         public function getPageTitle() { return $this->mPagetitle; }
 330         public function setSubtitle( $str ) { $this->mSubtitle = /*$this->parse(*/$str/*)*/; } // @bug 2514
 331         public function appendSubtitle( $str ) { $this->mSubtitle .= /*$this->parse(*/$str/*)*/; } // @bug 2514
 332         public function getSubtitle() { return $this->mSubtitle; }
 333         public function isArticle() { return $this->mIsarticle; }
 334         public function setPrintable() { $this->mPrintable = true; }
 335         public function isPrintable() { return $this->mPrintable; }
 336         public function setSyndicated( $show = true ) { $this->mShowFeedLinks = $show; }
 337         public function isSyndicated() { return $this->mShowFeedLinks; }
 338         public function setFeedAppendQuery( $val ) { $this->mFeedLinksAppendQuery = $val; }
 339         public function getFeedAppendQuery() { return $this->mFeedLinksAppendQuery; }
 340         public function setOnloadHandler( $js ) { $this->mOnloadHandler = $js; }
 341         public function getOnloadHandler() { return $this->mOnloadHandler; }
 342         public function disable() { $this->mDoNothing = true; }
 343         public function isDisabled() { return $this->mDoNothing; }
 344
 345         public function setArticleRelated( $v ) {
 346                 $this->mIsArticleRelated = $v;
 347                 if ( !$v ) {
 348                         $this->mIsarticle = false;
 349                 }
 350         }
 351         public function setArticleFlag( $v ) {
 352                 $this->mIsarticle = $v;
 353                 if ( $v ) {
 354                         $this->mIsArticleRelated = $v;
 355                 }
 356         }
 357
 358         public function isArticleRelated() { return $this->mIsArticleRelated; }
 359
 360         public function getLanguageLinks() { return $this->mLanguageLinks; }
 361         public function addLanguageLinks($newLinkArray) {
 362                 $this->mLanguageLinks += $newLinkArray;
 363         }
 364         public function setLanguageLinks($newLinkArray) {
 365                 $this->mLanguageLinks = $newLinkArray;
 366         }
 367
 368         public function getCategoryLinks() {
 369                 return $this->mCategoryLinks;
 370         }
 371
 372         /**
 373          * Add an array of categories, with names in the keys
 374          */
 375         public function addCategoryLinks( $categories ) {
 376                 global $wgUser, $wgContLang;
 377
 378                 if ( !is_array( $categories ) || count( $categories ) == 0 ) {
 379                         return;
 380                 }
 381
 382                 # Add the links to a LinkBatch
 383                 $arr = array( NS_CATEGORY => $categories );
 384                 $lb = new LinkBatch;
 385                 $lb->setArray( $arr );
 386
 387                 # Fetch existence plus the hiddencat property
 388                 $dbr = wfGetDB( DB_SLAVE );
 389                 $pageTable = $dbr->tableName( 'page' );
 390                 $where = $lb->constructSet( 'page', $dbr );
 391                 $propsTable = $dbr->tableName( 'page_props' );
 392                 $sql = "SELECT page_id, page_namespace, page_title, page_len, page_is_redirect, pp_value
 393                         FROM $pageTable LEFT JOIN $propsTable ON pp_propname='hiddencat' AND pp_page=page_id WHERE $where";
 394                 $res = $dbr->query( $sql, __METHOD__ );
 395
 396                 # Add the results to the link cache
 397                 $lb->addResultToCache( LinkCache::singleton(), $res );
 398
 399                 # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
 400                 $categories = array_combine( array_keys( $categories ),
 401                         array_fill( 0, count( $categories ), 'normal' ) );
 402
 403                 # Mark hidden categories
 404                 foreach ( $res as $row ) {
 405                         if ( isset( $row->pp_value ) ) {
 406                                 $categories[$row->page_title] = 'hidden';
 407                         }
 408                 }
 409
 410                 # Add the remaining categories to the skin
 411                 if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
 412                         $sk = $wgUser->getSkin();
 413                         foreach ( $categories as $category => $type ) {
 414                                 $origcategory = $category;
 415                                 $title = Title::makeTitleSafe( NS_CATEGORY, $category );
 416                                 $wgContLang->findVariantLink( $category, $title, true );
 417                                 if ( $category != $origcategory )
 418                                         if ( array_key_exists( $category, $categories ) )
 419                                                 continue;
 420                                 $text = $wgContLang->convertHtml( $title->getText() );
 421                                 $this->mCategoryLinks[$type][] = $sk->makeLinkObj( $title, $text );
 422                         }
 423                 }
 424         }
 425
 426         public function setCategoryLinks($categories) {
 427                 $this->mCategoryLinks = array();
 428                 $this->addCategoryLinks($categories);
 429         }
 430
 431         public function suppressQuickbar() { $this->mSuppressQuickbar = true; }
 432         public function isQuickbarSuppressed() { return $this->mSuppressQuickbar; }
 433
 434         public function disallowUserJs() { $this->mAllowUserJs = false; }
 435         public function isUserJsAllowed() { return $this->mAllowUserJs; }
 436
 437         public function prependHTML( $text ) { $this->mBodytext = $text . $this->mBodytext; }
 438         public function addHTML( $text ) { $this->mBodytext .= $text; }
 439         public function clearHTML() { $this->mBodytext = ''; }
 440         public function getHTML() { return $this->mBodytext; }
 441         public function debug( $text ) { $this->mDebugtext .= $text; }
 442
 443         /* @deprecated */
 444         public function setParserOptions( $options ) {
 445                 wfDeprecated( __METHOD__ );
 446                 return $this->parserOptions( $options );
 447         }
 448
 449         public function parserOptions( $options = null ) {
 450                 if ( !$this->mParserOptions ) {
 451                         $this->mParserOptions = new ParserOptions;
 452                 }
 453                 return wfSetVar( $this->mParserOptions, $options );
 454         }
 455
 456         /**
 457          * Set the revision ID which will be seen by the wiki text parser
 458          * for things such as embedded {{REVISIONID}} variable use.
 459          * @param mixed $revid an integer, or NULL
 460          * @return mixed previous value
 461          */
 462         public function setRevisionId( $revid ) {
 463                 $val = is_null( $revid ) ? null : intval( $revid );
 464                 return wfSetVar( $this->mRevisionId, $val );
 465         }
 466
 467         public function getRevisionId() {
 468                 return $this->mRevisionId;
 469         }
 470
 471         /**
 472          * Convert wikitext to HTML and add it to the buffer
 473          * Default assumes that the current page title will
 474          * be used.
 475          *
 476          * @param string $text
 477          * @param bool   $linestart
 478          */
 479         public function addWikiText( $text, $linestart = true ) {
 480                 global $wgTitle;
 481                 $this->addWikiTextTitle($text, $wgTitle, $linestart);
 482         }
 483
 484         public function addWikiTextWithTitle($text, &$title, $linestart = true) {
 485                 $this->addWikiTextTitle($text, $title, $linestart);
 486         }
 487
 488         function addWikiTextTitleTidy($text, &$title, $linestart = true) {
 489                 $this->addWikiTextTitle( $text, $title, $linestart, true );
 490         }
 491
 492         public function addWikiTextTitle($text, &$title, $linestart, $tidy = false) {
 493                 global $wgParser;
 494
 495                 wfProfileIn( __METHOD__ );
 496
 497                 wfIncrStats( 'pcache_not_possible' );
 498
 499                 $popts = $this->parserOptions();
 500                 $oldTidy = $popts->setTidy( $tidy );
 501
 502                 $parserOutput = $wgParser->parse( $text, $title, $popts,
 503                         $linestart, true, $this->mRevisionId );
 504
 505                 $popts->setTidy( $oldTidy );
 506
 507                 $this->addParserOutput( $parserOutput );
 508
 509                 wfProfileOut( __METHOD__ );
 510         }
 511
 512         /**
 513          * @todo document
 514          * @param ParserOutput object &$parserOutput
 515          */
 516         public function addParserOutputNoText( &$parserOutput ) {
 517                 global $wgTitle, $wgExemptFromUserRobotsControl, $wgContentNamespaces;
 518
 519                 $this->mLanguageLinks += $parserOutput->getLanguageLinks();
 520                 $this->addCategoryLinks( $parserOutput->getCategories() );
 521                 $this->mNewSectionLink = $parserOutput->getNewSection();
 522                 $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
 523
 524                 if( is_null( $wgExemptFromUserRobotsControl ) ) {
 525                         $bannedNamespaces = $wgContentNamespaces;
 526                 } else {
 527                         $bannedNamespaces = $wgExemptFromUserRobotsControl;
 528                 }
 529                 if( !in_array( $wgTitle->getNamespace(), $bannedNamespaces ) ) {
 530                         # FIXME (bug 14900): This overrides $wgArticleRobotPolicies, and it
 531                         # shouldn't
 532                         $this->setIndexPolicy( $parserOutput->getIndexPolicy() );
 533                 }
 534
 535                 $this->addKeywords( $parserOutput );
 536                 $this->mParseWarnings = $parserOutput->getWarnings();
 537                 if ( $parserOutput->getCacheTime() == -1 ) {
 538                         $this->enableClientCache( false );
 539                 }
 540                 $this->mNoGallery = $parserOutput->getNoGallery();
 541                 $this->mHeadItems = array_merge( $this->mHeadItems, (array)$parserOutput->mHeadItems );
 542                 // Versioning...
 543                 foreach ( (array)$parserOutput->mTemplateIds as $ns => $dbks ) {
 544                         if ( isset( $this->mTemplateIds[$ns] ) ) {
 545                                 $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
 546                         } else {
 547                                 $this->mTemplateIds[$ns] = $dbks;
 548                         }
 549                 }
 550                 // Page title
 551                 if( ( $dt = $parserOutput->getDisplayTitle() ) !== false )
 552                         $this->setPageTitle( $dt );
 553                 else if ( ( $title = $parserOutput->getTitleText() ) != '' )
 554                         $this->setPageTitle( $title );
 555
 556                 // Hooks registered in the object
 557                 global $wgParserOutputHooks;
 558                 foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {
 559                         list( $hookName, $data ) = $hookInfo;
 560                         if ( isset( $wgParserOutputHooks[$hookName] ) ) {
 561                                 call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );
 562                         }
 563                 }
 564
 565                 wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );
 566         }
 567
 568         /**
 569          * @todo document
 570          * @param ParserOutput &$parserOutput
 571          */
 572         function addParserOutput( &$parserOutput ) {
 573                 $this->addParserOutputNoText( $parserOutput );
 574                 $text = $parserOutput->getText();
 575                 wfRunHooks( 'OutputPageBeforeHTML',array( &$this, &$text ) );
 576                 $this->addHTML( $text );
 577         }
 578
 579         /**
 580          * Add wikitext to the buffer, assuming that this is the primary text for a page view
 581          * Saves the text into the parser cache if possible.
 582          *
 583          * @param string  $text
 584          * @param Article $article
 585          * @param bool    $cache
 586          * @deprecated Use Article::outputWikitext
 587          */
 588         public function addPrimaryWikiText( $text, $article, $cache = true ) {
 589                 global $wgParser, $wgUser;
 590
 591                 wfDeprecated( __METHOD__ );
 592
 593                 $popts = $this->parserOptions();
 594                 $popts->setTidy(true);
 595                 $parserOutput = $wgParser->parse( $text, $article->mTitle,
 596                         $popts, true, true, $this->mRevisionId );
 597                 $popts->setTidy(false);
 598                 if ( $cache && $article && $parserOutput->getCacheTime() != -1 ) {
 599                         $parserCache = ParserCache::singleton();
 600                         $parserCache->save( $parserOutput, $article, $popts);
 601                 }
 602
 603                 $this->addParserOutput( $parserOutput );
 604         }
 605
 606         /**
 607          * @deprecated use addWikiTextTidy()
 608          */
 609         public function addSecondaryWikiText( $text, $linestart = true ) {
 610                 global $wgTitle;
 611                 wfDeprecated( __METHOD__ );
 612                 $this->addWikiTextTitleTidy($text, $wgTitle, $linestart);
 613         }
 614
 615         /**
 616          * Add wikitext with tidy enabled
 617          */
 618         public function addWikiTextTidy(  $text, $linestart = true ) {
 619                 global $wgTitle;
 620                 $this->addWikiTextTitleTidy($text, $wgTitle, $linestart);
 621         }
 622
 623
 624         /**
 625          * Add the output of a QuickTemplate to the output buffer
 626          *
 627          * @param QuickTemplate $template
 628          */
 629         public function addTemplate( &$template ) {
 630                 ob_start();
 631                 $template->execute();
 632                 $this->addHTML( ob_get_contents() );
 633                 ob_end_clean();
 634         }
 635
 636         /**
 637          * Parse wikitext and return the HTML.
 638          *
 639          * @param string $text
 640          * @param bool   $linestart Is this the start of a line?
 641          * @param bool   $interface ??
 642          */
 643         public function parse( $text, $linestart = true, $interface = false ) {
 644                 global $wgParser, $wgTitle;
 645                 if( is_null( $wgTitle ) ) {
 646                         throw new MWException( 'Empty $wgTitle in ' . __METHOD__ );
 647                 }
 648                 $popts = $this->parserOptions();
 649                 if ( $interface) { $popts->setInterfaceMessage(true); }
 650                 $parserOutput = $wgParser->parse( $text, $wgTitle, $popts,
 651                         $linestart, true, $this->mRevisionId );
 652                 if ( $interface) { $popts->setInterfaceMessage(false); }
 653                 return $parserOutput->getText();
 654         }
 655
 656         /** Parse wikitext, strip paragraphs, and return the HTML. */
 657         public function parseInline( $text, $linestart = true, $interface = false ) {
 658                 $parsed = $this->parse( $text, $linestart, $interface );
 659
 660                 $m = array();
 661                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {
 662                         $parsed = $m[1];
 663                 }
 664
 665                 return $parsed;
 666         }
 667
 668         /**
 669          * @param Article $article
 670          * @param User    $user
 671          *
 672          * @return bool True if successful, else false.
 673          */
 674         public function tryParserCache( &$article ) {
 675                 $parserCache = ParserCache::singleton();
 676                 $parserOutput = $parserCache->get( $article, $this->parserOptions() );
 677                 if ( $parserOutput !== false ) {
 678                         $this->addParserOutput( $parserOutput );
 679                         return true;
 680                 } else {
 681                         return false;
 682                 }
 683         }
 684
 685         /**
 686          * @param int $maxage Maximum cache time on the Squid, in seconds.
 687          */
 688         public function setSquidMaxage( $maxage ) {
 689                 $this->mSquidMaxage = $maxage;
 690         }
 691
 692         /**
 693          * Use enableClientCache(false) to force it to send nocache headers
 694          * @param $state ??
 695          */
 696         public function enableClientCache( $state ) {
 697                 return wfSetVar( $this->mEnableClientCache, $state );
 698         }
 699
 700         function getCacheVaryCookies() {
 701                 global $wgCookiePrefix, $wgCacheVaryCookies;
 702                 static $cookies;
 703                 if ( $cookies === null ) {
 704                         $cookies = array_merge(
 705                                 array(
 706                                         "{$wgCookiePrefix}Token",
 707                                         "{$wgCookiePrefix}LoggedOut",
 708                                         session_name()
 709                                 ),
 710                                 $wgCacheVaryCookies
 711                         );
 712                         wfRunHooks('GetCacheVaryCookies', array( $this, &$cookies ) );
 713                 }
 714                 return $cookies;
 715         }
 716
 717         function uncacheableBecauseRequestVars() {
 718                 global $wgRequest;
 719                 return  $wgRequest->getText('useskin', false) === false
 720                         && $wgRequest->getText('uselang', false) === false;
 721         }
 722
 723         /**
 724          * Check if the request has a cache-varying cookie header
 725          * If it does, it's very important that we don't allow public caching
 726          */
 727         function haveCacheVaryCookies() {
 728                 global $wgRequest;
 729                 $cookieHeader = $wgRequest->getHeader( 'cookie' );
 730                 if ( $cookieHeader === false ) {
 731                         return false;
 732                 }
 733                 $cvCookies = $this->getCacheVaryCookies();
 734                 foreach ( $cvCookies as $cookieName ) {
 735                         # Check for a simple string match, like the way squid does it
 736                         if ( strpos( $cookieHeader, $cookieName ) ) {
 737                                 wfDebug( __METHOD__.": found $cookieName\n" );
 738                                 return true;
 739                         }
 740                 }
 741                 wfDebug( __METHOD__.": no cache-varying cookies found\n" );
 742                 return false;
 743         }
 744
 745         /** Get a complete X-Vary-Options header */
 746         public function getXVO() {
 747                 $cvCookies = $this->getCacheVaryCookies();
 748                 $xvo = 'X-Vary-Options: Accept-Encoding;list-contains=gzip,Cookie;';
 749                 $first = true;
 750                 foreach ( $cvCookies as $cookieName ) {
 751                         if ( $first ) {
 752                                 $first = false;
 753                         } else {
 754                                 $xvo .= ';';
 755                         }
 756                         $xvo .= 'string-contains=' . $cookieName;
 757                 }
 758                 return $xvo;
 759         }
 760
 761         public function sendCacheControl() {
 762                 global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgRequest;
 763
 764                 $response = $wgRequest->response();
 765                 if ($wgUseETag && $this->mETag)
 766                         $response->header("ETag: $this->mETag");
 767
 768                 # don't serve compressed data to clients who can't handle it
 769                 # maintain different caches for logged-in users and non-logged in ones
 770                 $response->header( 'Vary: Accept-Encoding, Cookie' );
 771
 772                 # Add an X-Vary-Options header for Squid with Wikimedia patches
 773                 $response->header( $this->getXVO() );
 774
 775                 if( !$this->uncacheableBecauseRequestVars() && $this->mEnableClientCache ) {
 776                         if( $wgUseSquid && session_id() == '' &&
 777                           ! $this->isPrintable() && $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies() )
 778                         {
 779                                 if ( $wgUseESI ) {
 780                                         # We'll purge the proxy cache explicitly, but require end user agents
 781                                         # to revalidate against the proxy on each visit.
 782                                         # Surrogate-Control controls our Squid, Cache-Control downstream caches
 783                                         wfDebug( __METHOD__ . ": proxy caching with ESI; {$this->mLastModified} **\n", false );
 784                                         # start with a shorter timeout for initial testing
 785                                         # header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
 786                                         $response->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
 787                                         $response->header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
 788                                 } else {
 789                                         # We'll purge the proxy cache for anons explicitly, but require end user agents
 790                                         # to revalidate against the proxy on each visit.
 791                                         # IMPORTANT! The Squid needs to replace the Cache-Control header with
 792                                         # Cache-Control: s-maxage=0, must-revalidate, max-age=0
 793                                         wfDebug( __METHOD__ . ": local proxy caching; {$this->mLastModified} **\n", false );
 794                                         # start with a shorter timeout for initial testing
 795                                         # header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
 796                                         $response->header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
 797                                 }
 798                         } else {
 799                                 # We do want clients to cache if they can, but they *must* check for updates
 800                                 # on revisiting the page.
 801                                 wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );
 802                                 $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 803                                 $response->header( "Cache-Control: private, must-revalidate, max-age=0" );
 804                         }
 805                         if($this->mLastModified) {
 806                                 $response->header( "Last-Modified: {$this->mLastModified}" );
 807                         }
 808                 } else {
 809                         wfDebug( __METHOD__ . ": no caching **\n", false );
 810
 811                         # In general, the absence of a last modified header should be enough to prevent
 812                         # the client from using its cache. We send a few other things just to make sure.
 813                         $response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
 814                         $response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
 815                         $response->header( 'Pragma: no-cache' );
 816                 }
 817         }
 818
 819         /**
 820          * Finally, all the text has been munged and accumulated into
 821          * the object, let's actually output it:
 822          */
 823         public function output() {
 824                 global $wgUser, $wgOutputEncoding, $wgRequest;
 825                 global $wgContLanguageCode, $wgDebugRedirects, $wgMimeType;
 826                 global $wgJsMimeType, $wgUseAjax, $wgAjaxWatch;
 827                 global $wgEnableMWSuggest, $wgUniversalEditButton;
 828                 global $wgArticle, $wgTitle;
 829
 830                 if( $this->mDoNothing ){
 831                         return;
 832                 }
 833
 834                 wfProfileIn( __METHOD__ );
 835
 836                 if ( '' != $this->mRedirect ) {
 837                         # Standards require redirect URLs to be absolute
 838                         $this->mRedirect = wfExpandUrl( $this->mRedirect );
 839                         if( $this->mRedirectCode == '301') {
 840                                 if( !$wgDebugRedirects ) {
 841                                         $wgRequest->response()->header("HTTP/1.1 {$this->mRedirectCode} Moved Permanently");
 842                                 }
 843                                 $this->mLastModified = wfTimestamp( TS_RFC2822 );
 844                         }
 845
 846                         $this->sendCacheControl();
 847
 848                         $wgRequest->response()->header("Content-Type: text/html; charset=utf-8");
 849                         if( $wgDebugRedirects ) {
 850                                 $url = htmlspecialchars( $this->mRedirect );
 851                                 print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
 852                                 print "<p>Location: <a href=\"$url\">$url</a></p>\n";
 853                                 print "</body>\n</html>\n";
 854                         } else {
 855                                 $wgRequest->response()->header( 'Location: '.$this->mRedirect );
 856                         }
 857                         wfProfileOut( __METHOD__ );
 858                         return;
 859                 }
 860                 elseif ( $this->mStatusCode )
 861                 {
 862                         $statusMessage = array(
 863                                 100 => 'Continue',
 864                                 101 => 'Switching Protocols',
 865                                 102 => 'Processing',
 866                                 200 => 'OK',
 867                                 201 => 'Created',
 868                                 202 => 'Accepted',
 869                                 203 => 'Non-Authoritative Information',
 870                                 204 => 'No Content',
 871                                 205 => 'Reset Content',
 872                                 206 => 'Partial Content',
 873                                 207 => 'Multi-Status',
 874                                 300 => 'Multiple Choices',
 875                                 301 => 'Moved Permanently',
 876                                 302 => 'Found',
 877                                 303 => 'See Other',
 878                                 304 => 'Not Modified',
 879                                 305 => 'Use Proxy',
 880                                 307 => 'Temporary Redirect',
 881                                 400 => 'Bad Request',
 882                                 401 => 'Unauthorized',
 883                                 402 => 'Payment Required',
 884                                 403 => 'Forbidden',
 885                                 404 => 'Not Found',
 886                                 405 => 'Method Not Allowed',
 887                                 406 => 'Not Acceptable',
 888                                 407 => 'Proxy Authentication Required',
 889                                 408 => 'Request Timeout',
 890                                 409 => 'Conflict',
 891                                 410 => 'Gone',
 892                                 411 => 'Length Required',
 893                                 412 => 'Precondition Failed',
 894                                 413 => 'Request Entity Too Large',
 895                                 414 => 'Request-URI Too Large',
 896                                 415 => 'Unsupported Media Type',
 897                                 416 => 'Request Range Not Satisfiable',
 898                                 417 => 'Expectation Failed',
 899                                 422 => 'Unprocessable Entity',
 900                                 423 => 'Locked',
 901                                 424 => 'Failed Dependency',
 902                                 500 => 'Internal Server Error',
 903                                 501 => 'Not Implemented',
 904                                 502 => 'Bad Gateway',
 905                                 503 => 'Service Unavailable',
 906                                 504 => 'Gateway Timeout',
 907                                 505 => 'HTTP Version Not Supported',
 908                                 507 => 'Insufficient Storage'
 909                         );
 910
 911                         if ( $statusMessage[$this->mStatusCode] )
 912                                 $wgRequest->response()->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $statusMessage[$this->mStatusCode] );
 913                 }
 914
 915                 $sk = $wgUser->getSkin();
 916
 917                 if ( $wgUseAjax ) {
 918                         $this->addScriptFile( 'ajax.js' );
 919
 920                         wfRunHooks( 'AjaxAddScript', array( &$this ) );
 921
 922                         if( $wgAjaxWatch && $wgUser->isLoggedIn() ) {
 923                                 $this->addScriptFile( 'ajaxwatch.js' );
 924                         }
 925
 926                         if ( $wgEnableMWSuggest && !$wgUser->getOption( 'disablesuggest', false ) ){
 927                                 $this->addScriptFile( 'mwsuggest.js' );
 928                         }
 929                 }
 930
 931                 if( $wgUser->getBoolOption( 'editsectiononrightclick' ) ) {
 932                         $this->addScriptFile( 'rightclickedit.js' );
 933                 }
 934
 935                 if( $wgUniversalEditButton ) {
 936                         if( isset( $wgArticle ) && isset( $wgTitle ) && $wgTitle->quickUserCan( 'edit' )
 937                                 && ( $wgTitle->exists() || $wgTitle->quickUserCan( 'create' ) ) ) {
 938                                 // Original UniversalEditButton
 939                                 $this->addLink( array(
 940                                         'rel' => 'alternate',
 941                                         'type' => 'application/x-wiki',
 942                                         'title' => wfMsg( 'edit' ),
 943                                         'href' => $wgTitle->getLocalURL( 'action=edit' )
 944                                 ) );
 945                                 // Alternate edit link
 946                                 $this->addLink( array(
 947                                         'rel' => 'edit',
 948                                         'title' => wfMsg( 'edit' ),
 949                                         'href' => $wgTitle->getLocalURL( 'action=edit' )
 950                                 ) );
 951                         }
 952                 }
 953
 954                 # Buffer output; final headers may depend on later processing
 955                 ob_start();
 956
 957                 $wgRequest->response()->header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
 958                 $wgRequest->response()->header( 'Content-language: '.$wgContLanguageCode );
 959
 960                 if ($this->mArticleBodyOnly) {
 961                         $this->out($this->mBodytext);
 962                 } else {
 963                         // Hook that allows last minute changes to the output page, e.g.
 964                         // adding of CSS or Javascript by extensions.
 965                         wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
 966
 967                         wfProfileIn( 'Output-skin' );
 968                         $sk->outputPage( $this );
 969                         wfProfileOut( 'Output-skin' );
 970                 }
 971
 972                 $this->sendCacheControl();
 973                 ob_end_flush();
 974                 wfProfileOut( __METHOD__ );
 975         }
 976
 977         /**
 978          * @todo document
 979          * @param string $ins
 980          */
 981         public function out( $ins ) {
 982                 global $wgInputEncoding, $wgOutputEncoding, $wgContLang;
 983                 if ( 0 == strcmp( $wgInputEncoding, $wgOutputEncoding ) ) {
 984                         $outs = $ins;
 985                 } else {
 986                         $outs = $wgContLang->iconv( $wgInputEncoding, $wgOutputEncoding, $ins );
 987                         if ( false === $outs ) { $outs = $ins; }
 988                 }
 989                 print $outs;
 990         }
 991
 992         /**
 993          * @todo document
 994          */
 995         public static function setEncodings() {
 996                 global $wgInputEncoding, $wgOutputEncoding;
 997                 global $wgUser, $wgContLang;
 998
 999                 $wgInputEncoding = strtolower( $wgInputEncoding );
1000
1001                 if ( empty( $_SERVER['HTTP_ACCEPT_CHARSET'] ) ) {
1002                         $wgOutputEncoding = strtolower( $wgOutputEncoding );
1003                         return;
1004                 }
1005                 $wgOutputEncoding = $wgInputEncoding;
1006         }
1007
1008         /**
1009          * Deprecated, use wfReportTime() instead.
1010          * @return string
1011          * @deprecated
1012          */
1013         public function reportTime() {
1014                 wfDeprecated( __METHOD__ );
1015                 $time = wfReportTime();
1016                 return $time;
1017         }
1018
1019         /**
1020          * Produce a "user is blocked" page.
1021          *
1022          * @param bool $return Whether to have a "return to $wgTitle" message or not.
1023          * @return nothing
1024          */
1025         function blockedPage( $return = true ) {
1026                 global $wgUser, $wgContLang, $wgTitle, $wgLang;
1027
1028                 $this->setPageTitle( wfMsg( 'blockedtitle' ) );
1029                 $this->setRobotPolicy( 'noindex,nofollow' );
1030                 $this->setArticleRelated( false );
1031
1032                 $name = User::whoIs( $wgUser->blockedBy() );
1033                 $reason = $wgUser->blockedFor();
1034                 if( $reason == '' ) {
1035                         $reason = wfMsg( 'blockednoreason' );
1036                 }
1037                 $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $wgUser->mBlock->mTimestamp ), true );
1038                 $ip = wfGetIP();
1039
1040                 $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1041
1042                 $blockid = $wgUser->mBlock->mId;
1043
1044                 $blockExpiry = $wgUser->mBlock->mExpiry;
1045                 if ( $blockExpiry == 'infinity' ) {
1046                         // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1047                         // Search for localization in 'ipboptions'
1048                         $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1049                         foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1050                                 if ( strpos( $option, ":" ) === false )
1051                                         continue;
1052                                 list( $show, $value ) = explode( ":", $option );
1053                                 if ( $value == 'infinite' || $value == 'indefinite' ) {
1054                                         $blockExpiry = $show;
1055                                         break;
1056                                 }
1057                         }
1058                 } else {
1059                         $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1060                 }
1061
1062                 if ( $wgUser->mBlock->mAuto ) {
1063                         $msg = 'autoblockedtext';
1064                 } else {
1065                         $msg = 'blockedtext';
1066                 }
1067
1068                 /* $ip returns who *is* being blocked, $intended contains who was meant to be blocked.
1069                  * This could be a username, an ip range, or a single ip. */
1070                 $intended = $wgUser->mBlock->mAddress;
1071
1072                 $this->addWikiMsg( $msg, $link, $reason, $ip, $name, $blockid, $blockExpiry, $intended, $blockTimestamp );
1073
1074                 # Don't auto-return to special pages
1075                 if( $return ) {
1076                         $return = $wgTitle->getNamespace() > -1 ? $wgTitle : NULL;
1077                         $this->returnToMain( null, $return );
1078                 }
1079         }
1080
1081         /**
1082          * Output a standard error page
1083          *
1084          * @param string $title Message key for page title
1085          * @param string $msg Message key for page text
1086          * @param array $params Message parameters
1087          */
1088         public function showErrorPage( $title, $msg, $params = array() ) {
1089                 global $wgTitle;
1090                 if ( isset($wgTitle) ) {
1091                         $this->mDebugtext .= 'Original title: ' . $wgTitle->getPrefixedText() . "\n";
1092                 }
1093                 $this->setPageTitle( wfMsg( $title ) );
1094                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
1095                 $this->setRobotPolicy( 'noindex,nofollow' );
1096                 $this->setArticleRelated( false );
1097                 $this->enableClientCache( false );
1098                 $this->mRedirect = '';
1099                 $this->mBodytext = '';
1100
1101                 array_unshift( $params, 'parse' );
1102                 array_unshift( $params, $msg );
1103                 $this->addHTML( call_user_func_array( 'wfMsgExt', $params ) );
1104
1105                 $this->returnToMain();
1106         }
1107
1108         /**
1109          * Output a standard permission error page
1110          *
1111          * @param array $errors Error message keys
1112          */
1113         public function showPermissionsErrorPage( $errors, $action = null )
1114         {
1115                 global $wgTitle;
1116
1117                 $this->mDebugtext .= 'Original title: ' .
1118                 $wgTitle->getPrefixedText() . "\n";
1119                 $this->setPageTitle( wfMsg( 'permissionserrors' ) );
1120                 $this->setHTMLTitle( wfMsg( 'permissionserrors' ) );
1121                 $this->setRobotPolicy( 'noindex,nofollow' );
1122                 $this->setArticleRelated( false );
1123                 $this->enableClientCache( false );
1124                 $this->mRedirect = '';
1125                 $this->mBodytext = '';
1126                 $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
1127         }
1128
1129         /** @deprecated */
1130         public function errorpage( $title, $msg ) {
1131                 wfDeprecated( __METHOD__ );
1132                 throw new ErrorPageError( $title, $msg );
1133         }
1134
1135         /**
1136          * Display an error page indicating that a given version of MediaWiki is
1137          * required to use it
1138          *
1139          * @param mixed $version The version of MediaWiki needed to use the page
1140          */
1141         public function versionRequired( $version ) {
1142                 $this->setPageTitle( wfMsg( 'versionrequired', $version ) );
1143                 $this->setHTMLTitle( wfMsg( 'versionrequired', $version ) );
1144                 $this->setRobotPolicy( 'noindex,nofollow' );
1145                 $this->setArticleRelated( false );
1146                 $this->mBodytext = '';
1147
1148                 $this->addWikiMsg( 'versionrequiredtext', $version );
1149                 $this->returnToMain();
1150         }
1151
1152         /**
1153          * Display an error page noting that a given permission bit is required.
1154          *
1155          * @param string $permission key required
1156          */
1157         public function permissionRequired( $permission ) {
1158                 global $wgUser, $wgLang;
1159
1160                 $this->setPageTitle( wfMsg( 'badaccess' ) );
1161                 $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
1162                 $this->setRobotPolicy( 'noindex,nofollow' );
1163                 $this->setArticleRelated( false );
1164                 $this->mBodytext = '';
1165
1166                 $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
1167                         User::getGroupsWithPermission( $permission ) );
1168                 if( $groups ) {
1169                         $this->addWikiMsg( 'badaccess-groups',
1170                                 $wgLang->commaList( $groups ),
1171                                 count( $groups) );
1172                 } else {
1173                         $this->addWikiMsg( 'badaccess-group0' );
1174                 }
1175                 $this->returnToMain();
1176         }
1177
1178         /**
1179          * Use permissionRequired.
1180          * @deprecated
1181          */
1182         public function sysopRequired() {
1183                 throw new MWException( "Call to deprecated OutputPage::sysopRequired() method\n" );
1184         }
1185
1186         /**
1187          * Use permissionRequired.
1188          * @deprecated
1189          */
1190         public function developerRequired() {
1191                 throw new MWException( "Call to deprecated OutputPage::developerRequired() method\n" );
1192         }
1193
1194         /**
1195          * Produce the stock "please login to use the wiki" page
1196          */
1197         public function loginToUse() {
1198                 global $wgUser, $wgTitle, $wgContLang;
1199
1200                 if( $wgUser->isLoggedIn() ) {
1201                         $this->permissionRequired( 'read' );
1202                         return;
1203                 }
1204
1205                 $skin = $wgUser->getSkin();
1206
1207                 $this->setPageTitle( wfMsg( 'loginreqtitle' ) );
1208                 $this->setHtmlTitle( wfMsg( 'errorpagetitle' ) );
1209                 $this->setRobotPolicy( 'noindex,nofollow' );
1210                 $this->setArticleFlag( false );
1211
1212                 $loginTitle = SpecialPage::getTitleFor( 'Userlogin' );
1213                 $loginLink = $skin->makeKnownLinkObj( $loginTitle, wfMsgHtml( 'loginreqlink' ), 'returnto=' . $wgTitle->getPrefixedUrl() );
1214                 $this->addHTML( wfMsgWikiHtml( 'loginreqpagetext', $loginLink ) );
1215                 $this->addHTML( "\n<!--" . $wgTitle->getPrefixedUrl() . "-->" );
1216
1217                 # Don't return to the main page if the user can't read it
1218                 # otherwise we'll end up in a pointless loop
1219                 $mainPage = Title::newMainPage();
1220                 if( $mainPage->userCanRead() )
1221                         $this->returnToMain( null, $mainPage );
1222         }
1223
1224         /** @deprecated */
1225         public function databaseError( $fname, $sql, $error, $errno ) {
1226                 throw new MWException( "OutputPage::databaseError is obsolete\n" );
1227         }
1228
1229         /**
1230          * @param array $errors An array of arrays returned by Title::getUserPermissionsErrors
1231          * @return string The wikitext error-messages, formatted into a list.
1232          */
1233         public function formatPermissionsErrorMessage( $errors, $action = null ) {
1234                 if ($action == null) {
1235                         $text = wfMsgNoTrans( 'permissionserrorstext', count($errors)). "\n\n";
1236                 } else {
1237                         global $wgLang;
1238                         $action_desc = wfMsg( "action-$action" );
1239                         $text = wfMsgNoTrans( 'permissionserrorstext-withaction', count($errors), $action_desc ) . "\n\n";
1240                 }
1241
1242                 if (count( $errors ) > 1) {
1243                         $text .= '<ul class="permissions-errors">' . "\n";
1244
1245                         foreach( $errors as $error )
1246                         {
1247                                 $text .= '<li>';
1248                                 $text .= call_user_func_array( 'wfMsgNoTrans', $error );
1249                                 $text .= "</li>\n";
1250                         }
1251                         $text .= '</ul>';
1252                 } else {
1253                         $text .= '<div class="permissions-errors">' . call_user_func_array( 'wfMsgNoTrans', reset( $errors ) ) . '</div>';
1254                 }
1255
1256                 return $text;
1257         }
1258
1259         /**
1260          * Display a page stating that the Wiki is in read-only mode,
1261          * and optionally show the source of the page that the user
1262          * was trying to edit.  Should only be called (for this
1263          * purpose) after wfReadOnly() has returned true.
1264          *
1265          * For historical reasons, this function is _also_ used to
1266          * show the error message when a user tries to edit a page
1267          * they are not allowed to edit.  (Unless it's because they're
1268          * blocked, then we show blockedPage() instead.)  In this
1269          * case, the second parameter should be set to true and a list
1270          * of reasons supplied as the third parameter.
1271          *
1272          * @todo Needs to be split into multiple functions.
1273          *
1274          * @param string $source    Source code to show (or null).
1275          * @param bool   $protected Is this a permissions error?
1276          * @param array  $reasons   List of reasons for this error, as returned by Title::getUserPermissionsErrors().
1277          */
1278         public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
1279                 global $wgUser, $wgTitle;
1280                 $skin = $wgUser->getSkin();
1281
1282                 $this->setRobotPolicy( 'noindex,nofollow' );
1283                 $this->setArticleRelated( false );
1284
1285                 // If no reason is given, just supply a default "I can't let you do
1286                 // that, Dave" message.  Should only occur if called by legacy code.
1287                 if ( $protected && empty($reasons) ) {
1288                         $reasons[] = array( 'badaccess-group0' );
1289                 }
1290
1291                 if ( !empty($reasons) ) {
1292                         // Permissions error
1293                         if( $source ) {
1294                                 $this->setPageTitle( wfMsg( 'viewsource' ) );
1295                                 $this->setSubtitle( wfMsg( 'viewsourcefor', $skin->makeKnownLinkObj( $wgTitle ) ) );
1296                         } else {
1297                                 $this->setPageTitle( wfMsg( 'badaccess' ) );
1298                         }
1299                         $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
1300                 } else {
1301                         // Wiki is read only
1302                         $this->setPageTitle( wfMsg( 'readonly' ) );
1303                         $reason = wfReadOnlyReason();
1304                         $this->wrapWikiMsg( '<div class="mw-readonly-error">$1</div>', array( 'readonlytext', $reason ) );
1305                 }
1306
1307                 // Show source, if supplied
1308                 if( is_string( $source ) ) {
1309                         $this->addWikiMsg( 'viewsourcetext' );
1310                         $text = Xml::openElement( 'textarea',
1311                                                 array( 'id'   => 'wpTextbox1',
1312                                                        'name' => 'wpTextbox1',
1313                                                        'cols' => $wgUser->getOption( 'cols' ),
1314                                                        'rows' => $wgUser->getOption( 'rows' ),
1315                                                        'readonly' => 'readonly' ) );
1316                         $text .= htmlspecialchars( $source );
1317                         $text .= Xml::closeElement( 'textarea' );
1318                         $this->addHTML( $text );
1319
1320                         // Show templates used by this article
1321                         $skin = $wgUser->getSkin();
1322                         $article = new Article( $wgTitle );
1323                         $this->addHTML( "<div class='templatesUsed'>
1324 {$skin->formatTemplates( $article->getUsedTemplates() )}
1325 </div>
1326 " );
1327                 }
1328
1329                 # If the title doesn't exist, it's fairly pointless to print a return
1330                 # link to it.  After all, you just tried editing it and couldn't, so
1331                 # what's there to do there?
1332                 if( $wgTitle->exists() ) {
1333                         $this->returnToMain( null, $wgTitle );
1334                 }
1335         }
1336
1337         /** @deprecated */
1338         public function fatalError( $message ) {
1339                 wfDeprecated( __METHOD__ );
1340                 throw new FatalError( $message );
1341         }
1342
1343         /** @deprecated */
1344         public function unexpectedValueError( $name, $val ) {
1345                 wfDeprecated( __METHOD__ );
1346                 throw new FatalError( wfMsg( 'unexpected', $name, $val ) );
1347         }
1348
1349         /** @deprecated */
1350         public function fileCopyError( $old, $new ) {
1351                 wfDeprecated( __METHOD__ );
1352                 throw new FatalError( wfMsg( 'filecopyerror', $old, $new ) );
1353         }
1354
1355         /** @deprecated */
1356         public function fileRenameError( $old, $new ) {
1357                 wfDeprecated( __METHOD__ );
1358                 throw new FatalError( wfMsg( 'filerenameerror', $old, $new ) );
1359         }
1360
1361         /** @deprecated */
1362         public function fileDeleteError( $name ) {
1363                 wfDeprecated( __METHOD__ );
1364                 throw new FatalError( wfMsg( 'filedeleteerror', $name ) );
1365         }
1366
1367         /** @deprecated */
1368         public function fileNotFoundError( $name ) {
1369                 wfDeprecated( __METHOD__ );
1370                 throw new FatalError( wfMsg( 'filenotfound', $name ) );
1371         }
1372
1373         public function showFatalError( $message ) {
1374                 $this->setPageTitle( wfMsg( "internalerror" ) );
1375                 $this->setRobotPolicy( "noindex,nofollow" );
1376                 $this->setArticleRelated( false );
1377                 $this->enableClientCache( false );
1378                 $this->mRedirect = '';
1379                 $this->mBodytext = $message;
1380         }
1381
1382         public function showUnexpectedValueError( $name, $val ) {
1383                 $this->showFatalError( wfMsg( 'unexpected', $name, $val ) );
1384         }
1385
1386         public function showFileCopyError( $old, $new ) {
1387                 $this->showFatalError( wfMsg( 'filecopyerror', $old, $new ) );
1388         }
1389
1390         public function showFileRenameError( $old, $new ) {
1391                 $this->showFatalError( wfMsg( 'filerenameerror', $old, $new ) );
1392         }
1393
1394         public function showFileDeleteError( $name ) {
1395                 $this->showFatalError( wfMsg( 'filedeleteerror', $name ) );
1396         }
1397
1398         public function showFileNotFoundError( $name ) {
1399                 $this->showFatalError( wfMsg( 'filenotfound', $name ) );
1400         }
1401
1402         /**
1403          * Add a "return to" link pointing to a specified title
1404          *
1405          * @param Title $title Title to link
1406          */
1407         public function addReturnTo( $title ) {
1408                 global $wgUser;
1409                 $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullUrl() ) );
1410                 $link = wfMsg( 'returnto', $wgUser->getSkin()->makeLinkObj( $title ) );
1411                 $this->addHTML( "<p>{$link}</p>\n" );
1412         }
1413
1414         /**
1415          * Add a "return to" link pointing to a specified title,
1416          * or the title indicated in the request, or else the main page
1417          *
1418          * @param null $unused No longer used
1419          * @param Title $returnto Title to return to
1420          */
1421         public function returnToMain( $unused = null, $returnto = NULL ) {
1422                 global $wgRequest;
1423
1424                 if ( $returnto == NULL ) {
1425                         $returnto = $wgRequest->getText( 'returnto' );
1426                 }
1427
1428                 if ( '' === $returnto ) {
1429                         $returnto = Title::newMainPage();
1430                 }
1431
1432                 if ( is_object( $returnto ) ) {
1433                         $titleObj = $returnto;
1434                 } else {
1435                         $titleObj = Title::newFromText( $returnto );
1436                 }
1437                 if ( !is_object( $titleObj ) ) {
1438                         $titleObj = Title::newMainPage();
1439                 }
1440
1441                 $this->addReturnTo( $titleObj );
1442         }
1443
1444         /**
1445          * This function takes the title (first item of mGoodLinks), categories, existing and broken links for the page
1446          * and uses the first 10 of them for META keywords
1447          *
1448          * @param ParserOutput &$parserOutput
1449          */
1450         private function addKeywords( &$parserOutput ) {
1451                 global $wgTitle;
1452                 $this->addKeyword( $wgTitle->getPrefixedText() );
1453                 $count = 1;
1454                 $links2d =& $parserOutput->getLinks();
1455                 if ( !is_array( $links2d ) ) {
1456                         return;
1457                 }
1458                 foreach ( $links2d as $dbkeys ) {
1459                         foreach( $dbkeys as $dbkey => $unused ) {
1460                                 $this->addKeyword( $dbkey );
1461                                 if ( ++$count > 10 ) {
1462                                         break 2;
1463                                 }
1464                         }
1465                 }
1466         }
1467
1468         /**
1469          * @return string The doctype, opening <html>, and head element.
1470          */
1471         public function headElement( Skin $sk ) {
1472                 global $wgDocType, $wgDTD, $wgContLanguageCode, $wgOutputEncoding, $wgMimeType;
1473                 global $wgXhtmlDefaultNamespace, $wgXhtmlNamespaces;
1474                 global $wgUser, $wgContLang, $wgUseTrackbacks, $wgTitle, $wgStyleVersion;
1475
1476                 $this->addMeta( "http:Content-type", "$wgMimeType; charset={$wgOutputEncoding}" );
1477                 $this->addStyle( 'common/wikiprintable.css', 'print' );
1478                 $sk->setupUserCss( $this );
1479
1480                 $ret = '';
1481
1482                 if( $wgMimeType == 'text/xml' || $wgMimeType == 'application/xhtml+xml' || $wgMimeType == 'application/xml' ) {
1483                         $ret .= "<?xml version=\"1.0\" encoding=\"$wgOutputEncoding\" ?" . ">\n";
1484                 }
1485
1486                 $ret .= "<!DOCTYPE html PUBLIC \"$wgDocType\"\n        \"$wgDTD\">\n";
1487
1488                 if ( '' == $this->getHTMLTitle() ) {
1489                         $this->setHTMLTitle(  wfMsg( 'pagetitle', $this->getPageTitle() ));
1490                 }
1491
1492                 $rtl = $wgContLang->isRTL() ? " dir='RTL'" : '';
1493                 $ret .= "<html xmlns=\"{$wgXhtmlDefaultNamespace}\" ";
1494                 foreach($wgXhtmlNamespaces as $tag => $ns) {
1495                         $ret .= "xmlns:{$tag}=\"{$ns}\" ";
1496                 }
1497                 $ret .= "xml:lang=\"$wgContLanguageCode\" lang=\"$wgContLanguageCode\" $rtl>\n";
1498                 $ret .= "<head>\n<title>" . htmlspecialchars( $this->getHTMLTitle() ) . "</title>\n\t\t";
1499                 $ret .= implode( "\t\t", array(
1500                         $this->getHeadLinks(),
1501                         $this->buildCssLinks(),
1502                         $sk->getHeadScripts( $this->mAllowUserJs ),
1503                         $this->mScripts,
1504                         $this->getHeadItems(),
1505                 ));
1506                 if( $sk->usercss ){
1507                         $ret .= "<style type='text/css'>{$sk->usercss}</style>";
1508                 }
1509
1510                 if ($wgUseTrackbacks && $this->isArticleRelated())
1511                         $ret .= $wgTitle->trackbackRDF();
1512
1513                 $ret .= "</head>\n";
1514                 return $ret;
1515         }
1516
1517         protected function addDefaultMeta() {
1518                 global $wgVersion;
1519                 $this->addMeta( 'http:Content-Style-Type', 'text/css' ); //bug 15835
1520                 $this->addMeta( 'generator', "MediaWiki $wgVersion" );
1521
1522                 $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
1523                 if( $p !== 'index,follow' ) {
1524                         // http://www.robotstxt.org/wc/meta-user.html
1525                         // Only show if it's different from the default robots policy
1526                         $this->addMeta( 'robots', $p );
1527                 }
1528
1529                 if ( count( $this->mKeywords ) > 0 ) {
1530                         $strip = array(
1531                                 "/<.*?" . ">/" => '',
1532                                 "/_/" => ' '
1533                         );
1534                         $this->addMeta( 'keywords', preg_replace(array_keys($strip), array_values($strip),implode( ",", $this->mKeywords ) ) );
1535                 }
1536         }
1537
1538         /**
1539          * @return string HTML tag links to be put in the header.
1540          */
1541         public function getHeadLinks() {
1542                 global $wgRequest, $wgFeed;
1543
1544                 // Ideally this should happen earlier, somewhere. :P
1545                 $this->addDefaultMeta();
1546
1547                 $tags = array();
1548
1549                 foreach ( $this->mMetatags as $tag ) {
1550                         if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
1551                                 $a = 'http-equiv';
1552                                 $tag[0] = substr( $tag[0], 5 );
1553                         } else {
1554                                 $a = 'name';
1555                         }
1556                         $tags[] = Xml::element( 'meta',
1557                                 array(
1558                                         $a => $tag[0],
1559                                         'content' => $tag[1] ) );
1560                 }
1561                 foreach ( $this->mLinktags as $tag ) {
1562                         $tags[] = Xml::element( 'link', $tag );
1563                 }
1564
1565                 if( $wgFeed ) {
1566                         global $wgTitle;
1567                         foreach( $this->getSyndicationLinks() as $format => $link ) {
1568                                 # Use the page name for the title (accessed through $wgTitle since
1569                                 # there's no other way).  In principle, this could lead to issues
1570                                 # with having the same name for different feeds corresponding to
1571                                 # the same page, but we can't avoid that at this low a level.
1572
1573                                 $tags[] = $this->feedLink(
1574                                         $format,
1575                                         $link,
1576                                         wfMsg( "page-{$format}-feed", $wgTitle->getPrefixedText() ) ); # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
1577                         }
1578
1579                         # Recent changes feed should appear on every page (except recentchanges,
1580                         # that would be redundant). Put it after the per-page feed to avoid
1581                         # changing existing behavior. It's still available, probably via a
1582                         # menu in your browser. Some sites might have a different feed they'd
1583                         # like to promote instead of the RC feed (maybe like a "Recent New Articles"
1584                         # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
1585                         # If so, use it instead.
1586
1587                         global $wgOverrideSiteFeed, $wgSitename, $wgFeedClasses;
1588                         $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
1589
1590                         if ( $wgOverrideSiteFeed ) {
1591                                 foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
1592                                         $tags[] = $this->feedLink (
1593                                                 $type,
1594                                                 htmlspecialchars( $feedUrl ),
1595                                                 wfMsg( "site-{$type}-feed", $wgSitename ) );
1596                                 }
1597                         }
1598                         else if ( $wgTitle->getPrefixedText() != $rctitle->getPrefixedText() ) {
1599                                 foreach( $wgFeedClasses as $format => $class ) {
1600                                         $tags[] = $this->feedLink(
1601                                                 $format,
1602                                                 $rctitle->getLocalURL( "feed={$format}" ),
1603                                                 wfMsg( "site-{$format}-feed", $wgSitename ) ); # For grep: 'site-rss-feed', 'site-atom-feed'.
1604                                 }
1605                         }
1606                 }
1607
1608                 return implode( "\n\t\t", $tags ) . "\n";
1609         }
1610
1611         /**
1612          * Return URLs for each supported syndication format for this page.
1613          * @return array associating format keys with URLs
1614          */
1615         public function getSyndicationLinks() {
1616                 global $wgTitle, $wgFeedClasses;
1617                 $links = array();
1618
1619                 if( $this->isSyndicated() ) {
1620                         if( is_string( $this->getFeedAppendQuery() ) ) {
1621                                 $appendQuery = "&" . $this->getFeedAppendQuery();
1622                         } else {
1623                                 $appendQuery = "";
1624                         }
1625
1626                         foreach( $wgFeedClasses as $format => $class ) {
1627                                 $links[$format] = $wgTitle->getLocalUrl( "feed=$format{$appendQuery}" );
1628                         }
1629                 }
1630                 return $links;
1631         }
1632
1633         /**
1634          * Generate a <link rel/> for an RSS feed.
1635          */
1636         private function feedLink( $type, $url, $text ) {
1637                 return Xml::element( 'link', array(
1638                         'rel' => 'alternate',
1639                         'type' => "application/$type+xml",
1640                         'title' => $text,
1641                         'href' => $url ) );
1642         }
1643
1644         /**
1645          * Add a local or specified stylesheet, with the given media options.
1646          * Meant primarily for internal use...
1647          *
1648          * @param $media -- to specify a media type, 'screen', 'printable', 'handheld' or any.
1649          * @param $conditional -- for IE conditional comments, specifying an IE version
1650          * @param $dir -- set to 'rtl' or 'ltr' for direction-specific sheets
1651          */
1652         public function addStyle( $style, $media='', $condition='', $dir='' ) {
1653                 $options = array();
1654                 if( $media )
1655                         $options['media'] = $media;
1656                 if( $condition )
1657                         $options['condition'] = $condition;
1658                 if( $dir )
1659                         $options['dir'] = $dir;
1660                 $this->styles[$style] = $options;
1661         }
1662
1663         /**
1664          * Build a set of <link>s for the stylesheets specified in the $this->styles array.
1665          * These will be applied to various media & IE conditionals.
1666          */
1667         public function buildCssLinks() {
1668                 $links = array();
1669                 foreach( $this->styles as $file => $options ) {
1670                         $link = $this->styleLink( $file, $options );
1671                         if( $link )
1672                                 $links[] = $link;
1673                 }
1674
1675                 return implode( "\n\t\t", $links );
1676         }
1677
1678         protected function styleLink( $style, $options ) {
1679                 global $wgRequest;
1680
1681                 if( isset( $options['dir'] ) ) {
1682                         global $wgContLang;
1683                         $siteDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
1684                         if( $siteDir != $options['dir'] )
1685                                 return '';
1686                 }
1687
1688                 if( isset( $options['media'] ) ) {
1689                         $media = $this->transformCssMedia( $options['media'] );
1690                         if( is_null( $media ) ) {
1691                                 return '';
1692                         }
1693                 } else {
1694                         $media = '';
1695                 }
1696
1697                 if( substr( $style, 0, 1 ) == '/' ||
1698                         substr( $style, 0, 5 ) == 'http:' ||
1699                         substr( $style, 0, 6 ) == 'https:' ) {
1700                         $url = $style;
1701                 } else {
1702                         global $wgStylePath, $wgStyleVersion;
1703                         $url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;
1704                 }
1705
1706                 $attribs = array(
1707                         'rel' => 'stylesheet',
1708                         'href' => $url,
1709                         'type' => 'text/css' );
1710                 if( $media ) {
1711                         $attribs['media'] = $media;
1712                 }
1713
1714                 $link = Xml::element( 'link', $attribs );
1715
1716                 if( isset( $options['condition'] ) ) {
1717                         $condition = htmlspecialchars( $options['condition'] );
1718                         $link = "<!--[if $condition]>$link<![endif]-->";
1719                 }
1720                 return $link;
1721         }
1722
1723         function transformCssMedia( $media ) {
1724                 global $wgRequest, $wgHandheldForIPhone;
1725
1726                 // Switch in on-screen display for media testing
1727                 $switches = array(
1728                         'printable' => 'print',
1729                         'handheld' => 'handheld',
1730                 );
1731                 foreach( $switches as $switch => $targetMedia ) {
1732                         if( $wgRequest->getBool( $switch ) ) {
1733                                 if( $media == $targetMedia ) {
1734                                         $media = '';
1735                                 } elseif( $media == 'screen' ) {
1736                                         return null;
1737                                 }
1738                         }
1739                 }
1740
1741                 // Expand longer media queries as iPhone doesn't grok 'handheld'
1742                 if( $wgHandheldForIPhone ) {
1743                         $mediaAliases = array(
1744                                 'screen' => 'screen and (min-device-width: 481px)',
1745                                 'handheld' => 'handheld, only screen and (max-device-width: 480px)',
1746                         );
1747
1748                         if( isset( $mediaAliases[$media] ) ) {
1749                                 $media = $mediaAliases[$media];
1750                         }
1751                 }
1752
1753                 return $media;
1754         }
1755
1756         /**
1757          * Turn off regular page output and return an error reponse
1758          * for when rate limiting has triggered.
1759          */
1760         public function rateLimited() {
1761                 global $wgTitle;
1762
1763                 $this->setPageTitle(wfMsg('actionthrottled'));
1764                 $this->setRobotPolicy( 'noindex,follow' );
1765                 $this->setArticleRelated( false );
1766                 $this->enableClientCache( false );
1767                 $this->mRedirect = '';
1768                 $this->clearHTML();
1769                 $this->setStatusCode(503);
1770                 $this->addWikiMsg( 'actionthrottledtext' );
1771
1772                 $this->returnToMain( null, $wgTitle );
1773         }
1774
1775         /**
1776          * Show an "add new section" link?
1777          *
1778          * @return bool
1779          */
1780         public function showNewSectionLink() {
1781                 return $this->mNewSectionLink;
1782         }
1783
1784         /**
1785         * Forcibly hide the new section link?
1786         *
1787         * @return bool
1788         */
1789         public function forceHideNewSectionLink() {
1790                 return $this->mHideNewSectionLink;
1791         }
1792
1793         /**
1794          * Show a warning about slave lag
1795          *
1796          * If the lag is higher than $wgSlaveLagCritical seconds,
1797          * then the warning is a bit more obvious. If the lag is
1798          * lower than $wgSlaveLagWarning, then no warning is shown.
1799          *
1800          * @param int $lag Slave lag
1801          */
1802         public function showLagWarning( $lag ) {
1803                 global $wgSlaveLagWarning, $wgSlaveLagCritical;
1804                 if( $lag >= $wgSlaveLagWarning ) {
1805                         $message = $lag < $wgSlaveLagCritical
1806                                 ? 'lag-warn-normal'
1807                                 : 'lag-warn-high';
1808                         $warning = wfMsgExt( $message, 'parse', $lag );
1809                         $this->addHTML( "<div class=\"mw-{$message}\">\n{$warning}\n</div>\n" );
1810                 }
1811         }
1812
1813         /**
1814          * Add a wikitext-formatted message to the output.
1815          * This is equivalent to:
1816          *
1817          *    $wgOut->addWikiText( wfMsgNoTrans( ... ) )
1818          */
1819         public function addWikiMsg( /*...*/ ) {
1820                 $args = func_get_args();
1821                 $name = array_shift( $args );
1822                 $this->addWikiMsgArray( $name, $args );
1823         }
1824
1825         /**
1826          * Add a wikitext-formatted message to the output.
1827          * Like addWikiMsg() except the parameters are taken as an array
1828          * instead of a variable argument list.
1829          *
1830          * $options is passed through to wfMsgExt(), see that function for details.
1831          */
1832         public function addWikiMsgArray( $name, $args, $options = array() ) {
1833                 $options[] = 'parse';
1834                 $text = wfMsgExt( $name, $options, $args );
1835                 $this->addHTML( $text );
1836         }
1837
1838         /**
1839          * This function takes a number of message/argument specifications, wraps them in
1840          * some overall structure, and then parses the result and adds it to the output.
1841          *
1842          * In the $wrap, $1 is replaced with the first message, $2 with the second, and so
1843          * on. The subsequent arguments may either be strings, in which case they are the
1844          * message names, or an arrays, in which case the first element is the message name,
1845          * and subsequent elements are the parameters to that message.
1846          *
1847          * The special named parameter 'options' in a message specification array is passed
1848          * through to the $options parameter of wfMsgExt().
1849          *
1850          * Don't use this for messages that are not in users interface language.
1851          *
1852          * For example:
1853          *
1854          *    $wgOut->wrapWikiMsg( '<div class="error">$1</div>', 'some-error' );
1855          *
1856          * Is equivalent to:
1857          *
1858          *    $wgOut->addWikiText( '<div class="error">' . wfMsgNoTrans( 'some-error' ) . '</div>' );
1859          */
1860         public function wrapWikiMsg( $wrap /*, ...*/ ) {
1861                 $msgSpecs = func_get_args();
1862                 array_shift( $msgSpecs );
1863                 $msgSpecs = array_values( $msgSpecs );
1864                 $s = $wrap;
1865                 foreach ( $msgSpecs as $n => $spec ) {
1866                         $options = array();
1867                         if ( is_array( $spec ) ) {
1868                                 $args = $spec;
1869                                 $name = array_shift( $args );
1870                                 if ( isset( $args['options'] ) ) {
1871                                         $options = $args['options'];
1872                                         unset( $args['options'] );
1873                                 }
1874                         }  else {
1875                                 $args = array();
1876                                 $name = $spec;
1877                         }
1878                         $s = str_replace( '$' . ( $n + 1 ), wfMsgExt( $name, $options, $args ), $s );
1879                 }
1880                 $this->addHTML( $this->parse( $s, /*linestart*/true, /*uilang*/true ) );
1881         }
1882 }