includes/parser/ParserOutput.php

   1 <?php
   2
   3 /**
   4  * Output of the PHP parser.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19  * http://www.gnu.org/copyleft/gpl.html
  20  *
  21  * @file
  22  * @ingroup Parser
  23  */
  24 class ParserOutput extends CacheTime {
  25         /**
  26          * @var string $mText The output text
  27          */
  28         public $mText;
  29
  30         /**
  31          * @var array $mLanguageLinks List of the full text of language links,
  32          *  in the order they appear.
  33          */
  34         public $mLanguageLinks;
  35
  36         /**
  37          * @var array $mCategoriesMap of category names to sort keys
  38          */
  39         public $mCategories;
  40
  41         /**
  42          * @var array $mIndicators Page status indicators, usually displayed in top-right corner.
  43          */
  44         public $mIndicators = array();
  45
  46         /**
  47          * @var string $mTitleText Title text of the chosen language variant
  48          */
  49         public $mTitleText;
  50
  51         /**
  52          * @var array $mLinks 2-D map of NS/DBK to ID for the links in the document.
  53          *  ID=zero for broken.
  54          */
  55         public $mLinks = array();
  56
  57         /**
  58          * @var array $mTemplates 2-D map of NS/DBK to ID for the template references.
  59          *  ID=zero for broken.
  60          */
  61         public $mTemplates = array();
  62
  63         /**
  64          * @var array $mTemplateIds 2-D map of NS/DBK to rev ID for the template references.
  65          *  ID=zero for broken.
  66          */
  67         public $mTemplateIds = array();
  68
  69         /**
  70          * @var array $mImages DB keys of the images used, in the array key only
  71          */
  72         public $mImages = array();
  73
  74         /**
  75          * @var array $mFileSearchOptions DB keys of the images used mapped to sha1 and MW timestamp.
  76          */
  77         public $mFileSearchOptions = array();
  78
  79         /**
  80          * @var array $mExternalLinks External link URLs, in the key only.
  81          */
  82         public $mExternalLinks = array();
  83
  84         /**
  85          * @var array $mInterwikiLinks 2-D map of prefix/DBK (in keys only)
  86          *  for the inline interwiki links in the document.
  87          */
  88         public $mInterwikiLinks = array();
  89
  90         /**
  91          * @var bool $mNewSection Show a new section link?
  92          */
  93         public $mNewSection = false;
  94
  95         /**
  96          * @var bool $mHideNewSection Hide the new section link?
  97          */
  98         public $mHideNewSection = false;
  99
 100         /**
 101          * @var bool $mNoGallery No gallery on category page? (__NOGALLERY__).
 102          */
 103         public $mNoGallery = false;
 104
 105         /**
 106          * @var array $mHeadItems Items to put in the <head> section
 107          */
 108         public $mHeadItems = array();
 109
 110         /**
 111          * @var array $mModules Modules to be loaded by the resource loader
 112          */
 113         public $mModules = array();
 114
 115         /**
 116          * @var array $mModuleScripts Modules of which only the JS will be loaded by
 117          *  the resource loader.
 118          */
 119         public $mModuleScripts = array();
 120
 121         /**
 122          * @var array $mModuleStyles Modules of which only the CSSS will be loaded by
 123          *  the resource loader.
 124          */
 125         public $mModuleStyles = array();
 126
 127         /**
 128          * @var array $mJsConfigVars JavaScript config variable for mw.config combined with this page.
 129          */
 130         public $mJsConfigVars = array();
 131
 132         /**
 133          * @var array $mOutputHooks Hook tags as per $wgParserOutputHooks.
 134          */
 135         public $mOutputHooks = array();
 136
 137         /**
 138          * @var array $mWarnings Warning text to be returned to the user.
 139          *  Wikitext formatted, in the key only.
 140          */
 141         public $mWarnings = array();
 142
 143         /**
 144          * @var array $mSections Table of contents
 145          */
 146         public $mSections = array();
 147
 148         /**
 149          * @var bool $mEditSectionTokens prefix/suffix markers if edit sections were output as tokens.
 150          */
 151         public $mEditSectionTokens = false;
 152
 153         /**
 154          * @var array $mProperties Name/value pairs to be cached in the DB.
 155          */
 156         public $mProperties = array();
 157
 158         /**
 159          * @var string $mTOCHTML HTML of the TOC.
 160          */
 161         public $mTOCHTML = '';
 162
 163         /**
 164          * @var string $mTimestamp Timestamp of the revision.
 165          */
 166         public $mTimestamp;
 167
 168         /**
 169          * @var bool $mTOCEnabled Whether TOC should be shown, can't override __NOTOC__.
 170          */
 171         public $mTOCEnabled = true;
 172
 173         /**
 174          * @var bool $mEnableOOUI Whether OOUI should be enabled.
 175          */
 176         public $mEnableOOUI = false;
 177
 178         /**
 179          * @var string $mIndexPolicy 'index' or 'noindex'?  Any other value will result in no change.
 180          */
 181         private $mIndexPolicy = '';
 182
 183         /**
 184          * @var array $mAccessedOptions List of ParserOptions (stored in the keys).
 185          */
 186         private $mAccessedOptions = array();
 187
 188         /**
 189          * @var array $mExtensionData extra data used by extensions.
 190          */
 191         private $mExtensionData = array();
 192
 193         /**
 194          * @var array $mLimitReportData Parser limit report data.
 195          */
 196         private $mLimitReportData = array();
 197
 198         /**
 199          * @var array $mParseStartTime Timestamps for getTimeSinceStart().
 200          */
 201         private $mParseStartTime = array();
 202
 203         /**
 204          * @var bool $mPreventClickjacking Whether to emit X-Frame-Options: DENY.
 205          */
 206         private $mPreventClickjacking = false;
 207
 208         /**
 209          * @var array $mFlags Generic flags.
 210          */
 211         private $mFlags = array();
 212
 213         const EDITSECTION_REGEX =
 214                 '#<(?:mw:)?editsection page="(.*?)" section="(.*?)"(?:/>|>(.*?)(</(?:mw:)?editsection>))#';
 215
 216         public function __construct( $text = '', $languageLinks = array(), $categoryLinks = array(),
 217                 $unused = false, $titletext = ''
 218         ) {
 219                 $this->mText = $text;
 220                 $this->mLanguageLinks = $languageLinks;
 221                 $this->mCategories = $categoryLinks;
 222                 $this->mTitleText = $titletext;
 223         }
 224
 225         public function getText() {
 226                 $text = $this->mText;
 227                 if ( $this->mEditSectionTokens ) {
 228                         $text = preg_replace_callback(
 229                                 ParserOutput::EDITSECTION_REGEX,
 230                                 function ( $m ) {
 231                                         global $wgOut, $wgLang;
 232                                         $editsectionPage = Title::newFromText( htmlspecialchars_decode( $m[1] ) );
 233                                         $editsectionSection = htmlspecialchars_decode( $m[2] );
 234                                         $editsectionContent = isset( $m[4] ) ? $m[3] : null;
 235
 236                                         if ( !is_object( $editsectionPage ) ) {
 237                                                 throw new MWException( "Bad parser output text." );
 238                                         }
 239
 240                                         $skin = $wgOut->getSkin();
 241                                         return call_user_func_array(
 242                                                 array( $skin, 'doEditSectionLink' ),
 243                                                 array( $editsectionPage, $editsectionSection,
 244                                                         $editsectionContent, $wgLang->getCode() )
 245                                         );
 246                                 },
 247                                 $text
 248                         );
 249                 } else {
 250                         $text = preg_replace( ParserOutput::EDITSECTION_REGEX, '', $text );
 251                 }
 252
 253                 // If you have an old cached version of this class - sorry, you can't disable the TOC
 254                 if ( isset( $this->mTOCEnabled ) && $this->mTOCEnabled ) {
 255                         $text = str_replace( array( Parser::TOC_START, Parser::TOC_END ), '', $text );
 256                 } else {
 257                         $text = preg_replace(
 258                                 '#' . preg_quote( Parser::TOC_START, '#' ) . '.*?' . preg_quote( Parser::TOC_END, '#' ) . '#s',
 259                                 '',
 260                                 $text
 261                         );
 262                 }
 263                 return $text;
 264         }
 265
 266         public function &getLanguageLinks() {
 267                 return $this->mLanguageLinks;
 268         }
 269
 270         public function getInterwikiLinks() {
 271                 return $this->mInterwikiLinks;
 272         }
 273
 274         public function getCategoryLinks() {
 275                 return array_keys( $this->mCategories );
 276         }
 277
 278         public function &getCategories() {
 279                 return $this->mCategories;
 280         }
 281
 282         /**
 283          * @since 1.25
 284          */
 285         public function getIndicators() {
 286                 return $this->mIndicators;
 287         }
 288
 289         public function getTitleText() {
 290                 return $this->mTitleText;
 291         }
 292
 293         public function getSections() {
 294                 return $this->mSections;
 295         }
 296
 297         public function getEditSectionTokens() {
 298                 return $this->mEditSectionTokens;
 299         }
 300
 301         public function &getLinks() {
 302                 return $this->mLinks;
 303         }
 304
 305         public function &getTemplates() {
 306                 return $this->mTemplates;
 307         }
 308
 309         public function &getTemplateIds() {
 310                 return $this->mTemplateIds;
 311         }
 312
 313         public function &getImages() {
 314                 return $this->mImages;
 315         }
 316
 317         public function &getFileSearchOptions() {
 318                 return $this->mFileSearchOptions;
 319         }
 320
 321         public function &getExternalLinks() {
 322                 return $this->mExternalLinks;
 323         }
 324
 325         public function getNoGallery() {
 326                 return $this->mNoGallery;
 327         }
 328
 329         public function getHeadItems() {
 330                 return $this->mHeadItems;
 331         }
 332
 333         public function getModules() {
 334                 return $this->mModules;
 335         }
 336
 337         public function getModuleScripts() {
 338                 return $this->mModuleScripts;
 339         }
 340
 341         public function getModuleStyles() {
 342                 return $this->mModuleStyles;
 343         }
 344
 345         /**
 346          * @deprecated since 1.26 Obsolete
 347          * @return array
 348          */
 349         public function getModuleMessages() {
 350                 wfDeprecated( __METHOD__, '1.26' );
 351                 return array();
 352         }
 353
 354         /** @since 1.23 */
 355         public function getJsConfigVars() {
 356                 return $this->mJsConfigVars;
 357         }
 358
 359         public function getOutputHooks() {
 360                 return (array)$this->mOutputHooks;
 361         }
 362
 363         public function getWarnings() {
 364                 return array_keys( $this->mWarnings );
 365         }
 366
 367         public function getIndexPolicy() {
 368                 return $this->mIndexPolicy;
 369         }
 370
 371         public function getTOCHTML() {
 372                 return $this->mTOCHTML;
 373         }
 374
 375         public function getTimestamp() {
 376                 return $this->mTimestamp;
 377         }
 378
 379         public function getLimitReportData() {
 380                 return $this->mLimitReportData;
 381         }
 382
 383         public function getTOCEnabled() {
 384                 return $this->mTOCEnabled;
 385         }
 386
 387         public function getEnableOOUI() {
 388                 return $this->mEnableOOUI;
 389         }
 390
 391         public function setText( $text ) {
 392                 return wfSetVar( $this->mText, $text );
 393         }
 394
 395         public function setLanguageLinks( $ll ) {
 396                 return wfSetVar( $this->mLanguageLinks, $ll );
 397         }
 398
 399         public function setCategoryLinks( $cl ) {
 400                 return wfSetVar( $this->mCategories, $cl );
 401         }
 402
 403         public function setTitleText( $t ) {
 404                 return wfSetVar( $this->mTitleText, $t );
 405         }
 406
 407         public function setSections( $toc ) {
 408                 return wfSetVar( $this->mSections, $toc );
 409         }
 410
 411         public function setEditSectionTokens( $t ) {
 412                 return wfSetVar( $this->mEditSectionTokens, $t );
 413         }
 414
 415         public function setIndexPolicy( $policy ) {
 416                 return wfSetVar( $this->mIndexPolicy, $policy );
 417         }
 418
 419         public function setTOCHTML( $tochtml ) {
 420                 return wfSetVar( $this->mTOCHTML, $tochtml );
 421         }
 422
 423         public function setTimestamp( $timestamp ) {
 424                 return wfSetVar( $this->mTimestamp, $timestamp );
 425         }
 426
 427         public function setTOCEnabled( $flag ) {
 428                 return wfSetVar( $this->mTOCEnabled, $flag );
 429         }
 430
 431         public function addCategory( $c, $sort ) {
 432                 $this->mCategories[$c] = $sort;
 433         }
 434
 435         /**
 436          * @since 1.25
 437          */
 438         public function setIndicator( $id, $content ) {
 439                 $this->mIndicators[$id] = $content;
 440         }
 441
 442         /**
 443          * Enables OOUI, if true, in any OutputPage instance this ParserOutput
 444          * object is added to.
 445          *
 446          * @since 1.26
 447          * @param bool $enable If OOUI should be enabled or not
 448          */
 449         public function setEnableOOUI( $enable = false ) {
 450                 $this->mEnableOOUI = $enable;
 451         }
 452
 453         public function addLanguageLink( $t ) {
 454                 $this->mLanguageLinks[] = $t;
 455         }
 456
 457         public function addWarning( $s ) {
 458                 $this->mWarnings[$s] = 1;
 459         }
 460
 461         public function addOutputHook( $hook, $data = false ) {
 462                 $this->mOutputHooks[] = array( $hook, $data );
 463         }
 464
 465         public function setNewSection( $value ) {
 466                 $this->mNewSection = (bool)$value;
 467         }
 468         public function hideNewSection( $value ) {
 469                 $this->mHideNewSection = (bool)$value;
 470         }
 471         public function getHideNewSection() {
 472                 return (bool)$this->mHideNewSection;
 473         }
 474         public function getNewSection() {
 475                 return (bool)$this->mNewSection;
 476         }
 477
 478         /**
 479          * Checks, if a url is pointing to the own server
 480          *
 481          * @param string $internal The server to check against
 482          * @param string $url The url to check
 483          * @return bool
 484          */
 485         public static function isLinkInternal( $internal, $url ) {
 486                 return (bool)preg_match( '/^' .
 487                         # If server is proto relative, check also for http/https links
 488                         ( substr( $internal, 0, 2 ) === '//' ? '(?:https?:)?' : '' ) .
 489                         preg_quote( $internal, '/' ) .
 490                         # check for query/path/anchor or end of link in each case
 491                         '(?:[\?\/\#]|$)/i',
 492                         $url
 493                 );
 494         }
 495
 496         public function addExternalLink( $url ) {
 497                 # We don't register links pointing to our own server, unless... :-)
 498                 global $wgServer, $wgRegisterInternalExternals;
 499
 500                 $registerExternalLink = true;
 501                 if ( !$wgRegisterInternalExternals ) {
 502                         $registerExternalLink = !self::isLinkInternal( $wgServer, $url );
 503                 }
 504                 if ( $registerExternalLink ) {
 505                         $this->mExternalLinks[$url] = 1;
 506                 }
 507         }
 508
 509         /**
 510          * Record a local or interwiki inline link for saving in future link tables.
 511          *
 512          * @param Title $title
 513          * @param int|null $id Optional known page_id so we can skip the lookup
 514          */
 515         public function addLink( Title $title, $id = null ) {
 516                 if ( $title->isExternal() ) {
 517                         // Don't record interwikis in pagelinks
 518                         $this->addInterwikiLink( $title );
 519                         return;
 520                 }
 521                 $ns = $title->getNamespace();
 522                 $dbk = $title->getDBkey();
 523                 if ( $ns == NS_MEDIA ) {
 524                         // Normalize this pseudo-alias if it makes it down here...
 525                         $ns = NS_FILE;
 526                 } elseif ( $ns == NS_SPECIAL ) {
 527                         // We don't record Special: links currently
 528                         // It might actually be wise to, but we'd need to do some normalization.
 529                         return;
 530                 } elseif ( $dbk === '' ) {
 531                         // Don't record self links -  [[#Foo]]
 532                         return;
 533                 }
 534                 if ( !isset( $this->mLinks[$ns] ) ) {
 535                         $this->mLinks[$ns] = array();
 536                 }
 537                 if ( is_null( $id ) ) {
 538                         $id = $title->getArticleID();
 539                 }
 540                 $this->mLinks[$ns][$dbk] = $id;
 541         }
 542
 543         /**
 544          * Register a file dependency for this output
 545          * @param string $name Title dbKey
 546          * @param string $timestamp MW timestamp of file creation (or false if non-existing)
 547          * @param string $sha1 Base 36 SHA-1 of file (or false if non-existing)
 548          * @return void
 549          */
 550         public function addImage( $name, $timestamp = null, $sha1 = null ) {
 551                 $this->mImages[$name] = 1;
 552                 if ( $timestamp !== null && $sha1 !== null ) {
 553                         $this->mFileSearchOptions[$name] = array( 'time' => $timestamp, 'sha1' => $sha1 );
 554                 }
 555         }
 556
 557         /**
 558          * Register a template dependency for this output
 559          * @param Title $title
 560          * @param int $page_id
 561          * @param int $rev_id
 562          * @return void
 563          */
 564         public function addTemplate( $title, $page_id, $rev_id ) {
 565                 $ns = $title->getNamespace();
 566                 $dbk = $title->getDBkey();
 567                 if ( !isset( $this->mTemplates[$ns] ) ) {
 568                         $this->mTemplates[$ns] = array();
 569                 }
 570                 $this->mTemplates[$ns][$dbk] = $page_id;
 571                 if ( !isset( $this->mTemplateIds[$ns] ) ) {
 572                         $this->mTemplateIds[$ns] = array();
 573                 }
 574                 $this->mTemplateIds[$ns][$dbk] = $rev_id; // For versioning
 575         }
 576
 577         /**
 578          * @param Title $title Title object, must be an interwiki link
 579          * @throws MWException If given invalid input
 580          */
 581         public function addInterwikiLink( $title ) {
 582                 if ( !$title->isExternal() ) {
 583                         throw new MWException( 'Non-interwiki link passed, internal parser error.' );
 584                 }
 585                 $prefix = $title->getInterwiki();
 586                 if ( !isset( $this->mInterwikiLinks[$prefix] ) ) {
 587                         $this->mInterwikiLinks[$prefix] = array();
 588                 }
 589                 $this->mInterwikiLinks[$prefix][$title->getDBkey()] = 1;
 590         }
 591
 592         /**
 593          * Add some text to the "<head>".
 594          * If $tag is set, the section with that tag will only be included once
 595          * in a given page.
 596          * @param string $section
 597          * @param string|bool $tag
 598          */
 599         public function addHeadItem( $section, $tag = false ) {
 600                 if ( $tag !== false ) {
 601                         $this->mHeadItems[$tag] = $section;
 602                 } else {
 603                         $this->mHeadItems[] = $section;
 604                 }
 605         }
 606
 607         public function addModules( $modules ) {
 608                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 609         }
 610
 611         public function addModuleScripts( $modules ) {
 612                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 613         }
 614
 615         public function addModuleStyles( $modules ) {
 616                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 617         }
 618
 619         /**
 620          * @deprecated since 1.26 Use addModules() instead
 621          * @param string|array $modules
 622          */
 623         public function addModuleMessages( $modules ) {
 624                 wfDeprecated( __METHOD__, '1.26' );
 625         }
 626
 627         /**
 628          * Add one or more variables to be set in mw.config in JavaScript.
 629          *
 630          * @param string|array $keys Key or array of key/value pairs.
 631          * @param mixed $value [optional] Value of the configuration variable.
 632          * @since 1.23
 633          */
 634         public function addJsConfigVars( $keys, $value = null ) {
 635                 if ( is_array( $keys ) ) {
 636                         foreach ( $keys as $key => $value ) {
 637                                 $this->mJsConfigVars[$key] = $value;
 638                         }
 639                         return;
 640                 }
 641
 642                 $this->mJsConfigVars[$keys] = $value;
 643         }
 644
 645         /**
 646          * Copy items from the OutputPage object into this one
 647          *
 648          * @param OutputPage $out
 649          */
 650         public function addOutputPageMetadata( OutputPage $out ) {
 651                 $this->addModules( $out->getModules() );
 652                 $this->addModuleScripts( $out->getModuleScripts() );
 653                 $this->addModuleStyles( $out->getModuleStyles() );
 654                 $this->addJsConfigVars( $out->getJsConfigVars() );
 655
 656                 $this->mHeadItems = array_merge( $this->mHeadItems, $out->getHeadItemsArray() );
 657                 $this->mPreventClickjacking = $this->mPreventClickjacking || $out->getPreventClickjacking();
 658         }
 659
 660         /**
 661          * Add a tracking category, getting the title from a system message,
 662          * or print a debug message if the title is invalid.
 663          *
 664          * Any message used with this function should be registered so it will
 665          * show up on Special:TrackingCategories. Core messages should be added
 666          * to SpecialTrackingCategories::$coreTrackingCategories, and extensions
 667          * should add to "TrackingCategories" in their extension.json.
 668          *
 669          * @param string $msg Message key
 670          * @param Title $title title of the page which is being tracked
 671          * @return bool Whether the addition was successful
 672          * @since 1.25
 673          */
 674         public function addTrackingCategory( $msg, $title ) {
 675                 if ( $title->getNamespace() === NS_SPECIAL ) {
 676                         wfDebug( __METHOD__ . ": Not adding tracking category $msg to special page!\n" );
 677                         return false;
 678                 }
 679
 680                 // Important to parse with correct title (bug 31469)
 681                 $cat = wfMessage( $msg )
 682                         ->title( $title )
 683                         ->inContentLanguage()
 684                         ->text();
 685
 686                 # Allow tracking categories to be disabled by setting them to "-"
 687                 if ( $cat === '-' ) {
 688                         return false;
 689                 }
 690
 691                 $containerCategory = Title::makeTitleSafe( NS_CATEGORY, $cat );
 692                 if ( $containerCategory ) {
 693                         $this->addCategory( $containerCategory->getDBkey(), $this->getProperty( 'defaultsort' ) ?: '' );
 694                         return true;
 695                 } else {
 696                         wfDebug( __METHOD__ . ": [[MediaWiki:$msg]] is not a valid title!\n" );
 697                         return false;
 698                 }
 699         }
 700
 701         /**
 702          * Override the title to be used for display
 703          * -- this is assumed to have been validated
 704          * (check equal normalisation, etc.)
 705          *
 706          * @param string $text Desired title text
 707          */
 708         public function setDisplayTitle( $text ) {
 709                 $this->setTitleText( $text );
 710                 $this->setProperty( 'displaytitle', $text );
 711         }
 712
 713         /**
 714          * Get the title to be used for display
 715          *
 716          * @return string
 717          */
 718         public function getDisplayTitle() {
 719                 $t = $this->getTitleText();
 720                 if ( $t === '' ) {
 721                         return false;
 722                 }
 723                 return $t;
 724         }
 725
 726         /**
 727          * Fairly generic flag setter thingy.
 728          * @param string $flag
 729          */
 730         public function setFlag( $flag ) {
 731                 $this->mFlags[$flag] = true;
 732         }
 733
 734         public function getFlag( $flag ) {
 735                 return isset( $this->mFlags[$flag] );
 736         }
 737
 738         /**
 739          * Set a property to be stored in the page_props database table.
 740          *
 741          * page_props is a key value store indexed by the page ID. This allows
 742          * the parser to set a property on a page which can then be quickly
 743          * retrieved given the page ID or via a DB join when given the page
 744          * title.
 745          *
 746          * Since 1.23, page_props are also indexed by numeric value, to allow
 747          * for efficient "top k" queries of pages wrt a given property.
 748          *
 749          * setProperty() is thus used to propagate properties from the parsed
 750          * page to request contexts other than a page view of the currently parsed
 751          * article.
 752          *
 753          * Some applications examples:
 754          *
 755          *   * To implement hidden categories, hiding pages from category listings
 756          *     by storing a property.
 757          *
 758          *   * Overriding the displayed article title.
 759          *   @see ParserOutput::setDisplayTitle()
 760          *
 761          *   * To implement image tagging, for example displaying an icon on an
 762          *     image thumbnail to indicate that it is listed for deletion on
 763          *     Wikimedia Commons.
 764          *     This is not actually implemented, yet but would be pretty cool.
 765          *
 766          * @note Do not use setProperty() to set a property which is only used
 767          * in a context where the ParserOutput object itself is already available,
 768          * for example a normal page view. There is no need to save such a property
 769          * in the database since the text is already parsed. You can just hook
 770          * OutputPageParserOutput and get your data out of the ParserOutput object.
 771          *
 772          * If you are writing an extension where you want to set a property in the
 773          * parser which is used by an OutputPageParserOutput hook, you have to
 774          * associate the extension data directly with the ParserOutput object.
 775          * Since MediaWiki 1.21, you can use setExtensionData() to do this:
 776          *
 777          * @par Example:
 778          * @code
 779          *    $parser->getOutput()->setExtensionData( 'my_ext_foo', '...' );
 780          * @endcode
 781          *
 782          * And then later, in OutputPageParserOutput or similar:
 783          *
 784          * @par Example:
 785          * @code
 786          *    $output->getExtensionData( 'my_ext_foo' );
 787          * @endcode
 788          *
 789          * In MediaWiki 1.20 and older, you have to use a custom member variable
 790          * within the ParserOutput object:
 791          *
 792          * @par Example:
 793          * @code
 794          *    $parser->getOutput()->my_ext_foo = '...';
 795          * @endcode
 796          *
 797          */
 798         public function setProperty( $name, $value ) {
 799                 $this->mProperties[$name] = $value;
 800         }
 801
 802         /**
 803          * @param string $name The property name to look up.
 804          *
 805          * @return mixed|bool The value previously set using setProperty(). False if null or no value
 806          * was set for the given property name.
 807          *
 808          * @note You need to use getProperties() to check for boolean and null properties.
 809          */
 810         public function getProperty( $name ) {
 811                 return isset( $this->mProperties[$name] ) ? $this->mProperties[$name] : false;
 812         }
 813
 814         public function unsetProperty( $name ) {
 815                 unset( $this->mProperties[$name] );
 816         }
 817
 818         public function getProperties() {
 819                 if ( !isset( $this->mProperties ) ) {
 820                         $this->mProperties = array();
 821                 }
 822                 return $this->mProperties;
 823         }
 824
 825         /**
 826          * Returns the options from its ParserOptions which have been taken
 827          * into account to produce this output or false if not available.
 828          * @return array
 829          */
 830         public function getUsedOptions() {
 831                 if ( !isset( $this->mAccessedOptions ) ) {
 832                         return array();
 833                 }
 834                 return array_keys( $this->mAccessedOptions );
 835         }
 836
 837         /**
 838          * Tags a parser option for use in the cache key for this parser output.
 839          * Registered as a watcher at ParserOptions::registerWatcher() by Parser::clearState().
 840          * The information gathered here is available via getUsedOptions(),
 841          * and is used by ParserCache::save().
 842          *
 843          * @see ParserCache::getKey
 844          * @see ParserCache::save
 845          * @see ParserOptions::addExtraKey
 846          * @see ParserOptions::optionsHash
 847          * @param string $option
 848          */
 849         public function recordOption( $option ) {
 850                 $this->mAccessedOptions[$option] = true;
 851         }
 852
 853         /**
 854          * @deprecated since 1.25. Instead, store any relevant data using setExtensionData,
 855          *    and implement Content::getSecondaryDataUpdates() if possible, or use the
 856          *    'SecondaryDataUpdates' hook to construct the necessary update objects.
 857          *
 858          * @note Hard deprecation and removal without long deprecation period, since there are no
 859          *       known users, but known conceptual issues.
 860          *
 861          * @todo remove in 1.26
 862          *
 863          * @param DataUpdate $update
 864          *
 865          * @throws MWException
 866          */
 867         public function addSecondaryDataUpdate( DataUpdate $update ) {
 868                 wfDeprecated( __METHOD__, '1.25' );
 869                 throw new MWException(
 870                         'ParserOutput::addSecondaryDataUpdate() is no longer supported. ' .
 871                                 'Override Content::getSecondaryDataUpdates() ' .
 872                                 'or use the SecondaryDataUpdates hook instead.'
 873                 );
 874         }
 875
 876         /**
 877          * @deprecated since 1.25.
 878          *
 879          * @note Hard deprecation and removal without long deprecation period, since there are no
 880          *       known users, but known conceptual issues.
 881          *
 882          * @todo remove in 1.26
 883          *
 884          * @return bool false (since 1.25)
 885          */
 886         public function hasCustomDataUpdates() {
 887                 wfDeprecated( __METHOD__, '1.25' );
 888                 return false;
 889         }
 890
 891         /**
 892          * @deprecated since 1.25. Instead, store any relevant data using setExtensionData,
 893          *    and implement Content::getSecondaryDataUpdates() if possible, or use the
 894          *    'SecondaryDataUpdates' hook to construct the necessary update objects.
 895          *
 896          * @note Hard deprecation and removal without long deprecation period, since there are no
 897          *       known users, but known conceptual issues.
 898          *
 899          * @todo remove in 1.26
 900          *
 901          * @param Title $title
 902          * @param bool $recursive
 903          *
 904          * @return array An array of instances of DataUpdate
 905          */
 906         public function getSecondaryDataUpdates( Title $title = null, $recursive = true ) {
 907                 wfDeprecated( __METHOD__, '1.25' );
 908                 return array();
 909         }
 910
 911         /**
 912          * Attaches arbitrary data to this ParserObject. This can be used to store some information in
 913          * the ParserOutput object for later use during page output. The data will be cached along with
 914          * the ParserOutput object, but unlike data set using setProperty(), it is not recorded in the
 915          * database.
 916          *
 917          * This method is provided to overcome the unsafe practice of attaching extra information to a
 918          * ParserObject by directly assigning member variables.
 919          *
 920          * To use setExtensionData() to pass extension information from a hook inside the parser to a
 921          * hook in the page output, use this in the parser hook:
 922          *
 923          * @par Example:
 924          * @code
 925          *    $parser->getOutput()->setExtensionData( 'my_ext_foo', '...' );
 926          * @endcode
 927          *
 928          * And then later, in OutputPageParserOutput or similar:
 929          *
 930          * @par Example:
 931          * @code
 932          *    $output->getExtensionData( 'my_ext_foo' );
 933          * @endcode
 934          *
 935          * In MediaWiki 1.20 and older, you have to use a custom member variable
 936          * within the ParserOutput object:
 937          *
 938          * @par Example:
 939          * @code
 940          *    $parser->getOutput()->my_ext_foo = '...';
 941          * @endcode
 942          *
 943          * @since 1.21
 944          *
 945          * @param string $key The key for accessing the data. Extensions should take care to avoid
 946          *   conflicts in naming keys. It is suggested to use the extension's name as a prefix.
 947          *
 948          * @param mixed $value The value to set. Setting a value to null is equivalent to removing
 949          *   the value.
 950          */
 951         public function setExtensionData( $key, $value ) {
 952                 if ( $value === null ) {
 953                         unset( $this->mExtensionData[$key] );
 954                 } else {
 955                         $this->mExtensionData[$key] = $value;
 956                 }
 957         }
 958
 959         /**
 960          * Gets extensions data previously attached to this ParserOutput using setExtensionData().
 961          * Typically, such data would be set while parsing the page, e.g. by a parser function.
 962          *
 963          * @since 1.21
 964          *
 965          * @param string $key The key to look up.
 966          *
 967          * @return mixed|null The value previously set for the given key using setExtensionData()
 968          *         or null if no value was set for this key.
 969          */
 970         public function getExtensionData( $key ) {
 971                 if ( isset( $this->mExtensionData[$key] ) ) {
 972                         return $this->mExtensionData[$key];
 973                 }
 974
 975                 return null;
 976         }
 977
 978         private static function getTimes( $clock = null ) {
 979                 $ret = array();
 980                 if ( !$clock || $clock === 'wall' ) {
 981                         $ret['wall'] = microtime( true );
 982                 }
 983                 if ( !$clock || $clock === 'cpu' ) {
 984                         $ru = wfGetRusage();
 985                         if ( $ru ) {
 986                                 $ret['cpu'] = $ru['ru_utime.tv_sec'] + $ru['ru_utime.tv_usec'] / 1e6;
 987                                 $ret['cpu'] += $ru['ru_stime.tv_sec'] + $ru['ru_stime.tv_usec'] / 1e6;
 988                         }
 989                 }
 990                 return $ret;
 991         }
 992
 993         /**
 994          * Resets the parse start timestamps for future calls to getTimeSinceStart()
 995          * @since 1.22
 996          */
 997         public function resetParseStartTime() {
 998                 $this->mParseStartTime = self::getTimes();
 999         }
1000
1001         /**
1002          * Returns the time since resetParseStartTime() was last called
1003          *
1004          * Clocks available are:
1005          *  - wall: Wall clock time
1006          *  - cpu: CPU time (requires getrusage)
1007          *
1008          * @since 1.22
1009          * @param string $clock
1010          * @return float|null
1011          */
1012         public function getTimeSinceStart( $clock ) {
1013                 if ( !isset( $this->mParseStartTime[$clock] ) ) {
1014                         return null;
1015                 }
1016
1017                 $end = self::getTimes( $clock );
1018                 return $end[$clock] - $this->mParseStartTime[$clock];
1019         }
1020
1021         /**
1022          * Sets parser limit report data for a key
1023          *
1024          * The key is used as the prefix for various messages used for formatting:
1025          *  - $key: The label for the field in the limit report
1026          *  - $key-value-text: Message used to format the value in the "NewPP limit
1027          *      report" HTML comment. If missing, uses $key-format.
1028          *  - $key-value-html: Message used to format the value in the preview
1029          *      limit report table. If missing, uses $key-format.
1030          *  - $key-value: Message used to format the value. If missing, uses "$1".
1031          *
1032          * Note that all values are interpreted as wikitext, and so should be
1033          * encoded with htmlspecialchars() as necessary, but should avoid complex
1034          * HTML for sanity of display in the "NewPP limit report" comment.
1035          *
1036          * @since 1.22
1037          * @param string $key Message key
1038          * @param mixed $value Appropriate for Message::params()
1039          */
1040         public function setLimitReportData( $key, $value ) {
1041                 $this->mLimitReportData[$key] = $value;
1042         }
1043
1044         /**
1045          * Check whether the cache TTL was lowered due to dynamic content
1046          *
1047          * When content is determined by more than hard state (e.g. page edits),
1048          * such as template/file transclusions based on the current timestamp or
1049          * extension tags that generate lists based on queries, this return true.
1050          *
1051          * @return bool
1052          * @since 1.25
1053          */
1054         public function hasDynamicContent() {
1055                 global $wgParserCacheExpireTime;
1056
1057                 return $this->getCacheExpiry() < $wgParserCacheExpireTime;
1058         }
1059
1060         /**
1061          * Get or set the prevent-clickjacking flag
1062          *
1063          * @since 1.24
1064          * @param bool|null $flag New flag value, or null to leave it unchanged
1065          * @return bool Old flag value
1066          */
1067         public function preventClickjacking( $flag = null ) {
1068                 return wfSetVar( $this->mPreventClickjacking, $flag );
1069         }
1070
1071         /**
1072          * Save space for serialization by removing useless values
1073          * @return array
1074          */
1075         public function __sleep() {
1076                 return array_diff(
1077                         array_keys( get_object_vars( $this ) ),
1078                         array( 'mParseStartTime' )
1079                 );
1080         }
1081 }