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