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 = [];
  45
  46         /**
  47          * @var string $mTitleText Title text of the chosen language variant, as HTML.
  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 = [];
  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 = [];
  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 = [];
  68
  69         /**
  70          * @var array $mImages DB keys of the images used, in the array key only
  71          */
  72         public $mImages = [];
  73
  74         /**
  75          * @var array $mFileSearchOptions DB keys of the images used mapped to sha1 and MW timestamp.
  76          */
  77         public $mFileSearchOptions = [];
  78
  79         /**
  80          * @var array $mExternalLinks External link URLs, in the key only.
  81          */
  82         public $mExternalLinks = [];
  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 = [];
  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 = [];
 109
 110         /**
 111          * @var array $mModules Modules to be loaded by ResourceLoader
 112          */
 113         public $mModules = [];
 114
 115         /**
 116          * @var array $mModuleScripts Modules of which only the JS will be loaded by ResourceLoader.
 117          */
 118         public $mModuleScripts = [];
 119
 120         /**
 121          * @var array $mModuleStyles Modules of which only the CSSS will be loaded by ResourceLoader.
 122          */
 123         public $mModuleStyles = [];
 124
 125         /**
 126          * @var array $mJsConfigVars JavaScript config variable for mw.config combined with this page.
 127          */
 128         public $mJsConfigVars = [];
 129
 130         /**
 131          * @var array $mOutputHooks Hook tags as per $wgParserOutputHooks.
 132          */
 133         public $mOutputHooks = [];
 134
 135         /**
 136          * @var array $mWarnings Warning text to be returned to the user.
 137          *  Wikitext formatted, in the key only.
 138          */
 139         public $mWarnings = [];
 140
 141         /**
 142          * @var array $mSections Table of contents
 143          */
 144         public $mSections = [];
 145
 146         /**
 147          * @var bool $mEditSectionTokens prefix/suffix markers if edit sections were output as tokens.
 148          */
 149         public $mEditSectionTokens = false;
 150
 151         /**
 152          * @var array $mProperties Name/value pairs to be cached in the DB.
 153          */
 154         public $mProperties = [];
 155
 156         /**
 157          * @var string $mTOCHTML HTML of the TOC.
 158          */
 159         public $mTOCHTML = '';
 160
 161         /**
 162          * @var string $mTimestamp Timestamp of the revision.
 163          */
 164         public $mTimestamp;
 165
 166         /**
 167          * @var bool $mTOCEnabled Whether TOC should be shown, can't override __NOTOC__.
 168          */
 169         public $mTOCEnabled = true;
 170
 171         /**
 172          * @var bool $mEnableOOUI Whether OOUI should be enabled.
 173          */
 174         public $mEnableOOUI = false;
 175
 176         /**
 177          * @var string $mIndexPolicy 'index' or 'noindex'?  Any other value will result in no change.
 178          */
 179         private $mIndexPolicy = '';
 180
 181         /**
 182          * @var array $mAccessedOptions List of ParserOptions (stored in the keys).
 183          */
 184         private $mAccessedOptions = [];
 185
 186         /**
 187          * @var array $mExtensionData extra data used by extensions.
 188          */
 189         private $mExtensionData = [];
 190
 191         /**
 192          * @var array $mLimitReportData Parser limit report data.
 193          */
 194         private $mLimitReportData = [];
 195
 196         /** @var array Parser limit report data for JSON */
 197         private $mLimitReportJSData = [];
 198
 199         /**
 200          * @var array $mParseStartTime Timestamps for getTimeSinceStart().
 201          */
 202         private $mParseStartTime = [];
 203
 204         /**
 205          * @var bool $mPreventClickjacking Whether to emit X-Frame-Options: DENY.
 206          */
 207         private $mPreventClickjacking = false;
 208
 209         /**
 210          * @var array $mFlags Generic flags.
 211          */
 212         private $mFlags = [];
 213
 214         /** @var integer|null Assumed rev ID for {{REVISIONID}} if no revision is set */
 215         private $mSpeculativeRevId;
 216
 217         /** @var integer Upper bound of expiry based on parse duration */
 218         private $mMaxAdaptiveExpiry = INF;
 219
 220         const EDITSECTION_REGEX =
 221                 '#<(?:mw:)?editsection page="(.*?)" section="(.*?)"(?:/>|>(.*?)(</(?:mw:)?editsection>))#s';
 222
 223         // finalizeAdaptiveCacheExpiry() uses TTL = MAX( m * PARSE_TIME + b, MIN_AR_TTL)
 224         // Current values imply that m=3933.333333 and b=-333.333333
 225         // See https://www.nngroup.com/articles/website-response-times/
 226         const PARSE_FAST_SEC = .100; // perceived "fast" page parse
 227         const PARSE_SLOW_SEC = 1.0; // perceived "slow" page parse
 228         const FAST_AR_TTL = 60; // adaptive TTL for "fast" pages
 229         const SLOW_AR_TTL = 3600; // adaptive TTL for "slow" pages
 230         const MIN_AR_TTL = 15; // min adaptive TTL (for sanity, pool counter, and edit stashing)
 231
 232         public function __construct( $text = '', $languageLinks = [], $categoryLinks = [],
 233                 $unused = false, $titletext = ''
 234         ) {
 235                 $this->mText = $text;
 236                 $this->mLanguageLinks = $languageLinks;
 237                 $this->mCategories = $categoryLinks;
 238                 $this->mTitleText = $titletext;
 239         }
 240
 241         /**
 242          * Get the cacheable text with <mw:editsection> markers still in it. The
 243          * return value is suitable for writing back via setText() but is not valid
 244          * for display to the user.
 245          *
 246          * @since 1.27
 247          */
 248         public function getRawText() {
 249                 return $this->mText;
 250         }
 251
 252         public function getText() {
 253                 $text = $this->mText;
 254                 if ( $this->mEditSectionTokens ) {
 255                         $text = preg_replace_callback(
 256                                 ParserOutput::EDITSECTION_REGEX,
 257                                 function ( $m ) {
 258                                         global $wgOut, $wgLang;
 259                                         $editsectionPage = Title::newFromText( htmlspecialchars_decode( $m[1] ) );
 260                                         $editsectionSection = htmlspecialchars_decode( $m[2] );
 261                                         $editsectionContent = isset( $m[4] ) ? $m[3] : null;
 262
 263                                         if ( !is_object( $editsectionPage ) ) {
 264                                                 throw new MWException( "Bad parser output text." );
 265                                         }
 266
 267                                         $skin = $wgOut->getSkin();
 268                                         return call_user_func_array(
 269                                                 [ $skin, 'doEditSectionLink' ],
 270                                                 [ $editsectionPage, $editsectionSection,
 271                                                         $editsectionContent, $wgLang->getCode() ]
 272                                         );
 273                                 },
 274                                 $text
 275                         );
 276                 } else {
 277                         $text = preg_replace( ParserOutput::EDITSECTION_REGEX, '', $text );
 278                 }
 279
 280                 // If you have an old cached version of this class - sorry, you can't disable the TOC
 281                 if ( isset( $this->mTOCEnabled ) && $this->mTOCEnabled ) {
 282                         $text = str_replace( [ Parser::TOC_START, Parser::TOC_END ], '', $text );
 283                 } else {
 284                         $text = preg_replace(
 285                                 '#' . preg_quote( Parser::TOC_START, '#' ) . '.*?' . preg_quote( Parser::TOC_END, '#' ) . '#s',
 286                                 '',
 287                                 $text
 288                         );
 289                 }
 290                 return $text;
 291         }
 292
 293         /**
 294          * @param integer $id
 295          * @since 1.28
 296          */
 297         public function setSpeculativeRevIdUsed( $id ) {
 298                 $this->mSpeculativeRevId = $id;
 299         }
 300
 301         /** @since 1.28 */
 302         public function getSpeculativeRevIdUsed() {
 303                 return $this->mSpeculativeRevId;
 304         }
 305
 306         public function &getLanguageLinks() {
 307                 return $this->mLanguageLinks;
 308         }
 309
 310         public function getInterwikiLinks() {
 311                 return $this->mInterwikiLinks;
 312         }
 313
 314         public function getCategoryLinks() {
 315                 return array_keys( $this->mCategories );
 316         }
 317
 318         public function &getCategories() {
 319                 return $this->mCategories;
 320         }
 321
 322         /**
 323          * @since 1.25
 324          */
 325         public function getIndicators() {
 326                 return $this->mIndicators;
 327         }
 328
 329         public function getTitleText() {
 330                 return $this->mTitleText;
 331         }
 332
 333         public function getSections() {
 334                 return $this->mSections;
 335         }
 336
 337         public function getEditSectionTokens() {
 338                 return $this->mEditSectionTokens;
 339         }
 340
 341         public function &getLinks() {
 342                 return $this->mLinks;
 343         }
 344
 345         public function &getTemplates() {
 346                 return $this->mTemplates;
 347         }
 348
 349         public function &getTemplateIds() {
 350                 return $this->mTemplateIds;
 351         }
 352
 353         public function &getImages() {
 354                 return $this->mImages;
 355         }
 356
 357         public function &getFileSearchOptions() {
 358                 return $this->mFileSearchOptions;
 359         }
 360
 361         public function &getExternalLinks() {
 362                 return $this->mExternalLinks;
 363         }
 364
 365         public function getNoGallery() {
 366                 return $this->mNoGallery;
 367         }
 368
 369         public function getHeadItems() {
 370                 return $this->mHeadItems;
 371         }
 372
 373         public function getModules() {
 374                 return $this->mModules;
 375         }
 376
 377         public function getModuleScripts() {
 378                 return $this->mModuleScripts;
 379         }
 380
 381         public function getModuleStyles() {
 382                 return $this->mModuleStyles;
 383         }
 384
 385         /** @since 1.23 */
 386         public function getJsConfigVars() {
 387                 return $this->mJsConfigVars;
 388         }
 389
 390         public function getOutputHooks() {
 391                 return (array)$this->mOutputHooks;
 392         }
 393
 394         public function getWarnings() {
 395                 return array_keys( $this->mWarnings );
 396         }
 397
 398         public function getIndexPolicy() {
 399                 return $this->mIndexPolicy;
 400         }
 401
 402         public function getTOCHTML() {
 403                 return $this->mTOCHTML;
 404         }
 405
 406         /**
 407          * @return string|null TS_MW timestamp of the revision content
 408          */
 409         public function getTimestamp() {
 410                 return $this->mTimestamp;
 411         }
 412
 413         public function getLimitReportData() {
 414                 return $this->mLimitReportData;
 415         }
 416
 417         public function getLimitReportJSData() {
 418                 return $this->mLimitReportJSData;
 419         }
 420
 421         public function getTOCEnabled() {
 422                 return $this->mTOCEnabled;
 423         }
 424
 425         public function getEnableOOUI() {
 426                 return $this->mEnableOOUI;
 427         }
 428
 429         public function setText( $text ) {
 430                 return wfSetVar( $this->mText, $text );
 431         }
 432
 433         public function setLanguageLinks( $ll ) {
 434                 return wfSetVar( $this->mLanguageLinks, $ll );
 435         }
 436
 437         public function setCategoryLinks( $cl ) {
 438                 return wfSetVar( $this->mCategories, $cl );
 439         }
 440
 441         public function setTitleText( $t ) {
 442                 return wfSetVar( $this->mTitleText, $t );
 443         }
 444
 445         public function setSections( $toc ) {
 446                 return wfSetVar( $this->mSections, $toc );
 447         }
 448
 449         public function setEditSectionTokens( $t ) {
 450                 return wfSetVar( $this->mEditSectionTokens, $t );
 451         }
 452
 453         public function setIndexPolicy( $policy ) {
 454                 return wfSetVar( $this->mIndexPolicy, $policy );
 455         }
 456
 457         public function setTOCHTML( $tochtml ) {
 458                 return wfSetVar( $this->mTOCHTML, $tochtml );
 459         }
 460
 461         public function setTimestamp( $timestamp ) {
 462                 return wfSetVar( $this->mTimestamp, $timestamp );
 463         }
 464
 465         public function setTOCEnabled( $flag ) {
 466                 return wfSetVar( $this->mTOCEnabled, $flag );
 467         }
 468
 469         public function addCategory( $c, $sort ) {
 470                 $this->mCategories[$c] = $sort;
 471         }
 472
 473         /**
 474          * @since 1.25
 475          */
 476         public function setIndicator( $id, $content ) {
 477                 $this->mIndicators[$id] = $content;
 478         }
 479
 480         /**
 481          * Enables OOUI, if true, in any OutputPage instance this ParserOutput
 482          * object is added to.
 483          *
 484          * @since 1.26
 485          * @param bool $enable If OOUI should be enabled or not
 486          */
 487         public function setEnableOOUI( $enable = false ) {
 488                 $this->mEnableOOUI = $enable;
 489         }
 490
 491         public function addLanguageLink( $t ) {
 492                 $this->mLanguageLinks[] = $t;
 493         }
 494
 495         public function addWarning( $s ) {
 496                 $this->mWarnings[$s] = 1;
 497         }
 498
 499         public function addOutputHook( $hook, $data = false ) {
 500                 $this->mOutputHooks[] = [ $hook, $data ];
 501         }
 502
 503         public function setNewSection( $value ) {
 504                 $this->mNewSection = (bool)$value;
 505         }
 506         public function hideNewSection( $value ) {
 507                 $this->mHideNewSection = (bool)$value;
 508         }
 509         public function getHideNewSection() {
 510                 return (bool)$this->mHideNewSection;
 511         }
 512         public function getNewSection() {
 513                 return (bool)$this->mNewSection;
 514         }
 515
 516         /**
 517          * Checks, if a url is pointing to the own server
 518          *
 519          * @param string $internal The server to check against
 520          * @param string $url The url to check
 521          * @return bool
 522          */
 523         public static function isLinkInternal( $internal, $url ) {
 524                 return (bool)preg_match( '/^' .
 525                         # If server is proto relative, check also for http/https links
 526                         ( substr( $internal, 0, 2 ) === '//' ? '(?:https?:)?' : '' ) .
 527                         preg_quote( $internal, '/' ) .
 528                         # check for query/path/anchor or end of link in each case
 529                         '(?:[\?\/\#]|$)/i',
 530                         $url
 531                 );
 532         }
 533
 534         public function addExternalLink( $url ) {
 535                 # We don't register links pointing to our own server, unless... :-)
 536                 global $wgServer, $wgRegisterInternalExternals;
 537
 538                 $registerExternalLink = true;
 539                 if ( !$wgRegisterInternalExternals ) {
 540                         $registerExternalLink = !self::isLinkInternal( $wgServer, $url );
 541                 }
 542                 if ( $registerExternalLink ) {
 543                         $this->mExternalLinks[$url] = 1;
 544                 }
 545         }
 546
 547         /**
 548          * Record a local or interwiki inline link for saving in future link tables.
 549          *
 550          * @param Title $title
 551          * @param int|null $id Optional known page_id so we can skip the lookup
 552          */
 553         public function addLink( Title $title, $id = null ) {
 554                 if ( $title->isExternal() ) {
 555                         // Don't record interwikis in pagelinks
 556                         $this->addInterwikiLink( $title );
 557                         return;
 558                 }
 559                 $ns = $title->getNamespace();
 560                 $dbk = $title->getDBkey();
 561                 if ( $ns == NS_MEDIA ) {
 562                         // Normalize this pseudo-alias if it makes it down here...
 563                         $ns = NS_FILE;
 564                 } elseif ( $ns == NS_SPECIAL ) {
 565                         // We don't record Special: links currently
 566                         // It might actually be wise to, but we'd need to do some normalization.
 567                         return;
 568                 } elseif ( $dbk === '' ) {
 569                         // Don't record self links -  [[#Foo]]
 570                         return;
 571                 }
 572                 if ( !isset( $this->mLinks[$ns] ) ) {
 573                         $this->mLinks[$ns] = [];
 574                 }
 575                 if ( is_null( $id ) ) {
 576                         $id = $title->getArticleID();
 577                 }
 578                 $this->mLinks[$ns][$dbk] = $id;
 579         }
 580
 581         /**
 582          * Register a file dependency for this output
 583          * @param string $name Title dbKey
 584          * @param string $timestamp MW timestamp of file creation (or false if non-existing)
 585          * @param string $sha1 Base 36 SHA-1 of file (or false if non-existing)
 586          * @return void
 587          */
 588         public function addImage( $name, $timestamp = null, $sha1 = null ) {
 589                 $this->mImages[$name] = 1;
 590                 if ( $timestamp !== null && $sha1 !== null ) {
 591                         $this->mFileSearchOptions[$name] = [ 'time' => $timestamp, 'sha1' => $sha1 ];
 592                 }
 593         }
 594
 595         /**
 596          * Register a template dependency for this output
 597          * @param Title $title
 598          * @param int $page_id
 599          * @param int $rev_id
 600          * @return void
 601          */
 602         public function addTemplate( $title, $page_id, $rev_id ) {
 603                 $ns = $title->getNamespace();
 604                 $dbk = $title->getDBkey();
 605                 if ( !isset( $this->mTemplates[$ns] ) ) {
 606                         $this->mTemplates[$ns] = [];
 607                 }
 608                 $this->mTemplates[$ns][$dbk] = $page_id;
 609                 if ( !isset( $this->mTemplateIds[$ns] ) ) {
 610                         $this->mTemplateIds[$ns] = [];
 611                 }
 612                 $this->mTemplateIds[$ns][$dbk] = $rev_id; // For versioning
 613         }
 614
 615         /**
 616          * @param Title $title Title object, must be an interwiki link
 617          * @throws MWException If given invalid input
 618          */
 619         public function addInterwikiLink( $title ) {
 620                 if ( !$title->isExternal() ) {
 621                         throw new MWException( 'Non-interwiki link passed, internal parser error.' );
 622                 }
 623                 $prefix = $title->getInterwiki();
 624                 if ( !isset( $this->mInterwikiLinks[$prefix] ) ) {
 625                         $this->mInterwikiLinks[$prefix] = [];
 626                 }
 627                 $this->mInterwikiLinks[$prefix][$title->getDBkey()] = 1;
 628         }
 629
 630         /**
 631          * Add some text to the "<head>".
 632          * If $tag is set, the section with that tag will only be included once
 633          * in a given page.
 634          * @param string $section
 635          * @param string|bool $tag
 636          */
 637         public function addHeadItem( $section, $tag = false ) {
 638                 if ( $tag !== false ) {
 639                         $this->mHeadItems[$tag] = $section;
 640                 } else {
 641                         $this->mHeadItems[] = $section;
 642                 }
 643         }
 644
 645         public function addModules( $modules ) {
 646                 $this->mModules = array_merge( $this->mModules, (array)$modules );
 647         }
 648
 649         public function addModuleScripts( $modules ) {
 650                 $this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );
 651         }
 652
 653         public function addModuleStyles( $modules ) {
 654                 $this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );
 655         }
 656
 657         /**
 658          * Add one or more variables to be set in mw.config in JavaScript.
 659          *
 660          * @param string|array $keys Key or array of key/value pairs.
 661          * @param mixed $value [optional] Value of the configuration variable.
 662          * @since 1.23
 663          */
 664         public function addJsConfigVars( $keys, $value = null ) {
 665                 if ( is_array( $keys ) ) {
 666                         foreach ( $keys as $key => $value ) {
 667                                 $this->mJsConfigVars[$key] = $value;
 668                         }
 669                         return;
 670                 }
 671
 672                 $this->mJsConfigVars[$keys] = $value;
 673         }
 674
 675         /**
 676          * Copy items from the OutputPage object into this one
 677          *
 678          * @param OutputPage $out
 679          */
 680         public function addOutputPageMetadata( OutputPage $out ) {
 681                 $this->addModules( $out->getModules() );
 682                 $this->addModuleScripts( $out->getModuleScripts() );
 683                 $this->addModuleStyles( $out->getModuleStyles() );
 684                 $this->addJsConfigVars( $out->getJsConfigVars() );
 685
 686                 $this->mHeadItems = array_merge( $this->mHeadItems, $out->getHeadItemsArray() );
 687                 $this->mPreventClickjacking = $this->mPreventClickjacking || $out->getPreventClickjacking();
 688         }
 689
 690         /**
 691          * Add a tracking category, getting the title from a system message,
 692          * or print a debug message if the title is invalid.
 693          *
 694          * Any message used with this function should be registered so it will
 695          * show up on Special:TrackingCategories. Core messages should be added
 696          * to SpecialTrackingCategories::$coreTrackingCategories, and extensions
 697          * should add to "TrackingCategories" in their extension.json.
 698          *
 699          * @param string $msg Message key
 700          * @param Title $title title of the page which is being tracked
 701          * @return bool Whether the addition was successful
 702          * @since 1.25
 703          */
 704         public function addTrackingCategory( $msg, $title ) {
 705                 if ( $title->getNamespace() === NS_SPECIAL ) {
 706                         wfDebug( __METHOD__ . ": Not adding tracking category $msg to special page!\n" );
 707                         return false;
 708                 }
 709
 710                 // Important to parse with correct title (bug 31469)
 711                 $cat = wfMessage( $msg )
 712                         ->title( $title )
 713                         ->inContentLanguage()
 714                         ->text();
 715
 716                 # Allow tracking categories to be disabled by setting them to "-"
 717                 if ( $cat === '-' ) {
 718                         return false;
 719                 }
 720
 721                 $containerCategory = Title::makeTitleSafe( NS_CATEGORY, $cat );
 722                 if ( $containerCategory ) {
 723                         $this->addCategory( $containerCategory->getDBkey(), $this->getProperty( 'defaultsort' ) ?: '' );
 724                         return true;
 725                 } else {
 726                         wfDebug( __METHOD__ . ": [[MediaWiki:$msg]] is not a valid title!\n" );
 727                         return false;
 728                 }
 729         }
 730
 731         /**
 732          * Override the title to be used for display
 733          *
 734          * @note this is assumed to have been validated
 735          * (check equal normalisation, etc.)
 736          *
 737          * @note this is expected to be safe HTML,
 738          * ready to be served to the client.
 739          *
 740          * @param string $text Desired title text
 741          */
 742         public function setDisplayTitle( $text ) {
 743                 $this->setTitleText( $text );
 744                 $this->setProperty( 'displaytitle', $text );
 745         }
 746
 747         /**
 748          * Get the title to be used for display.
 749          *
 750          * As per the contract of setDisplayTitle(), this is safe HTML,
 751          * ready to be served to the client.
 752          *
 753          * @return string HTML
 754          */
 755         public function getDisplayTitle() {
 756                 $t = $this->getTitleText();
 757                 if ( $t === '' ) {
 758                         return false;
 759                 }
 760                 return $t;
 761         }
 762
 763         /**
 764          * Fairly generic flag setter thingy.
 765          * @param string $flag
 766          */
 767         public function setFlag( $flag ) {
 768                 $this->mFlags[$flag] = true;
 769         }
 770
 771         public function getFlag( $flag ) {
 772                 return isset( $this->mFlags[$flag] );
 773         }
 774
 775         /**
 776          * Set a property to be stored in the page_props database table.
 777          *
 778          * page_props is a key value store indexed by the page ID. This allows
 779          * the parser to set a property on a page which can then be quickly
 780          * retrieved given the page ID or via a DB join when given the page
 781          * title.
 782          *
 783          * Since 1.23, page_props are also indexed by numeric value, to allow
 784          * for efficient "top k" queries of pages wrt a given property.
 785          *
 786          * setProperty() is thus used to propagate properties from the parsed
 787          * page to request contexts other than a page view of the currently parsed
 788          * article.
 789          *
 790          * Some applications examples:
 791          *
 792          *   * To implement hidden categories, hiding pages from category listings
 793          *     by storing a property.
 794          *
 795          *   * Overriding the displayed article title.
 796          *   @see ParserOutput::setDisplayTitle()
 797          *
 798          *   * To implement image tagging, for example displaying an icon on an
 799          *     image thumbnail to indicate that it is listed for deletion on
 800          *     Wikimedia Commons.
 801          *     This is not actually implemented, yet but would be pretty cool.
 802          *
 803          * @note Do not use setProperty() to set a property which is only used
 804          * in a context where the ParserOutput object itself is already available,
 805          * for example a normal page view. There is no need to save such a property
 806          * in the database since the text is already parsed. You can just hook
 807          * OutputPageParserOutput and get your data out of the ParserOutput object.
 808          *
 809          * If you are writing an extension where you want to set a property in the
 810          * parser which is used by an OutputPageParserOutput hook, you have to
 811          * associate the extension data directly with the ParserOutput object.
 812          * Since MediaWiki 1.21, you can use setExtensionData() to do this:
 813          *
 814          * @par Example:
 815          * @code
 816          *    $parser->getOutput()->setExtensionData( 'my_ext_foo', '...' );
 817          * @endcode
 818          *
 819          * And then later, in OutputPageParserOutput or similar:
 820          *
 821          * @par Example:
 822          * @code
 823          *    $output->getExtensionData( 'my_ext_foo' );
 824          * @endcode
 825          *
 826          * In MediaWiki 1.20 and older, you have to use a custom member variable
 827          * within the ParserOutput object:
 828          *
 829          * @par Example:
 830          * @code
 831          *    $parser->getOutput()->my_ext_foo = '...';
 832          * @endcode
 833          */
 834         public function setProperty( $name, $value ) {
 835                 $this->mProperties[$name] = $value;
 836         }
 837
 838         /**
 839          * @param string $name The property name to look up.
 840          *
 841          * @return mixed|bool The value previously set using setProperty(). False if null or no value
 842          * was set for the given property name.
 843          *
 844          * @note You need to use getProperties() to check for boolean and null properties.
 845          */
 846         public function getProperty( $name ) {
 847                 return isset( $this->mProperties[$name] ) ? $this->mProperties[$name] : false;
 848         }
 849
 850         public function unsetProperty( $name ) {
 851                 unset( $this->mProperties[$name] );
 852         }
 853
 854         public function getProperties() {
 855                 if ( !isset( $this->mProperties ) ) {
 856                         $this->mProperties = [];
 857                 }
 858                 return $this->mProperties;
 859         }
 860
 861         /**
 862          * Returns the options from its ParserOptions which have been taken
 863          * into account to produce this output or false if not available.
 864          * @return array
 865          */
 866         public function getUsedOptions() {
 867                 if ( !isset( $this->mAccessedOptions ) ) {
 868                         return [];
 869                 }
 870                 return array_keys( $this->mAccessedOptions );
 871         }
 872
 873         /**
 874          * Tags a parser option for use in the cache key for this parser output.
 875          * Registered as a watcher at ParserOptions::registerWatcher() by Parser::clearState().
 876          * The information gathered here is available via getUsedOptions(),
 877          * and is used by ParserCache::save().
 878          *
 879          * @see ParserCache::getKey
 880          * @see ParserCache::save
 881          * @see ParserOptions::addExtraKey
 882          * @see ParserOptions::optionsHash
 883          * @param string $option
 884          */
 885         public function recordOption( $option ) {
 886                 $this->mAccessedOptions[$option] = true;
 887         }
 888
 889         /**
 890          * Attaches arbitrary data to this ParserObject. This can be used to store some information in
 891          * the ParserOutput object for later use during page output. The data will be cached along with
 892          * the ParserOutput object, but unlike data set using setProperty(), it is not recorded in the
 893          * database.
 894          *
 895          * This method is provided to overcome the unsafe practice of attaching extra information to a
 896          * ParserObject by directly assigning member variables.
 897          *
 898          * To use setExtensionData() to pass extension information from a hook inside the parser to a
 899          * hook in the page output, use this in the parser hook:
 900          *
 901          * @par Example:
 902          * @code
 903          *    $parser->getOutput()->setExtensionData( 'my_ext_foo', '...' );
 904          * @endcode
 905          *
 906          * And then later, in OutputPageParserOutput or similar:
 907          *
 908          * @par Example:
 909          * @code
 910          *    $output->getExtensionData( 'my_ext_foo' );
 911          * @endcode
 912          *
 913          * In MediaWiki 1.20 and older, you have to use a custom member variable
 914          * within the ParserOutput object:
 915          *
 916          * @par Example:
 917          * @code
 918          *    $parser->getOutput()->my_ext_foo = '...';
 919          * @endcode
 920          *
 921          * @since 1.21
 922          *
 923          * @param string $key The key for accessing the data. Extensions should take care to avoid
 924          *   conflicts in naming keys. It is suggested to use the extension's name as a prefix.
 925          *
 926          * @param mixed $value The value to set. Setting a value to null is equivalent to removing
 927          *   the value.
 928          */
 929         public function setExtensionData( $key, $value ) {
 930                 if ( $value === null ) {
 931                         unset( $this->mExtensionData[$key] );
 932                 } else {
 933                         $this->mExtensionData[$key] = $value;
 934                 }
 935         }
 936
 937         /**
 938          * Gets extensions data previously attached to this ParserOutput using setExtensionData().
 939          * Typically, such data would be set while parsing the page, e.g. by a parser function.
 940          *
 941          * @since 1.21
 942          *
 943          * @param string $key The key to look up.
 944          *
 945          * @return mixed|null The value previously set for the given key using setExtensionData()
 946          *         or null if no value was set for this key.
 947          */
 948         public function getExtensionData( $key ) {
 949                 if ( isset( $this->mExtensionData[$key] ) ) {
 950                         return $this->mExtensionData[$key];
 951                 }
 952
 953                 return null;
 954         }
 955
 956         private static function getTimes( $clock = null ) {
 957                 $ret = [];
 958                 if ( !$clock || $clock === 'wall' ) {
 959                         $ret['wall'] = microtime( true );
 960                 }
 961                 if ( !$clock || $clock === 'cpu' ) {
 962                         $ru = wfGetRusage();
 963                         if ( $ru ) {
 964                                 $ret['cpu'] = $ru['ru_utime.tv_sec'] + $ru['ru_utime.tv_usec'] / 1e6;
 965                                 $ret['cpu'] += $ru['ru_stime.tv_sec'] + $ru['ru_stime.tv_usec'] / 1e6;
 966                         }
 967                 }
 968                 return $ret;
 969         }
 970
 971         /**
 972          * Resets the parse start timestamps for future calls to getTimeSinceStart()
 973          * @since 1.22
 974          */
 975         public function resetParseStartTime() {
 976                 $this->mParseStartTime = self::getTimes();
 977         }
 978
 979         /**
 980          * Returns the time since resetParseStartTime() was last called
 981          *
 982          * Clocks available are:
 983          *  - wall: Wall clock time
 984          *  - cpu: CPU time (requires getrusage)
 985          *
 986          * @since 1.22
 987          * @param string $clock
 988          * @return float|null
 989          */
 990         public function getTimeSinceStart( $clock ) {
 991                 if ( !isset( $this->mParseStartTime[$clock] ) ) {
 992                         return null;
 993                 }
 994
 995                 $end = self::getTimes( $clock );
 996                 return $end[$clock] - $this->mParseStartTime[$clock];
 997         }
 998
 999         /**
1000          * Sets parser limit report data for a key
1001          *
1002          * The key is used as the prefix for various messages used for formatting:
1003          *  - $key: The label for the field in the limit report
1004          *  - $key-value-text: Message used to format the value in the "NewPP limit
1005          *      report" HTML comment. If missing, uses $key-format.
1006          *  - $key-value-html: Message used to format the value in the preview
1007          *      limit report table. If missing, uses $key-format.
1008          *  - $key-value: Message used to format the value. If missing, uses "$1".
1009          *
1010          * Note that all values are interpreted as wikitext, and so should be
1011          * encoded with htmlspecialchars() as necessary, but should avoid complex
1012          * HTML for sanity of display in the "NewPP limit report" comment.
1013          *
1014          * @since 1.22
1015          * @param string $key Message key
1016          * @param mixed $value Appropriate for Message::params()
1017          */
1018         public function setLimitReportData( $key, $value ) {
1019                 $this->mLimitReportData[$key] = $value;
1020
1021                 if ( is_array( $value ) ) {
1022                         if ( array_keys( $value ) === [ 0, 1 ]
1023                                 && is_numeric( $value[0] )
1024                                 && is_numeric( $value[1] )
1025                         ) {
1026                                 $data = [ 'value' => $value[0], 'limit' => $value[1] ];
1027                         } else {
1028                                 $data = $value;
1029                         }
1030                 } else {
1031                         $data = $value;
1032                 }
1033
1034                 if ( strpos( $key, '-' ) ) {
1035                         list( $ns, $name ) = explode( '-', $key, 2 );
1036                         $this->mLimitReportJSData[$ns][$name] = $data;
1037                 } else {
1038                         $this->mLimitReportJSData[$key] = $data;
1039                 }
1040         }
1041
1042         /**
1043          * Check whether the cache TTL was lowered due to dynamic content
1044          *
1045          * When content is determined by more than hard state (e.g. page edits),
1046          * such as template/file transclusions based on the current timestamp or
1047          * extension tags that generate lists based on queries, this return true.
1048          *
1049          * @return bool
1050          * @since 1.25
1051          */
1052         public function hasDynamicContent() {
1053                 global $wgParserCacheExpireTime;
1054
1055                 return $this->getCacheExpiry() < $wgParserCacheExpireTime;
1056         }
1057
1058         /**
1059          * Get or set the prevent-clickjacking flag
1060          *
1061          * @since 1.24
1062          * @param bool|null $flag New flag value, or null to leave it unchanged
1063          * @return bool Old flag value
1064          */
1065         public function preventClickjacking( $flag = null ) {
1066                 return wfSetVar( $this->mPreventClickjacking, $flag );
1067         }
1068
1069         /**
1070          * Lower the runtime adaptive TTL to at most this value
1071          *
1072          * @param integer $ttl
1073          * @since 1.28
1074          */
1075         public function updateRuntimeAdaptiveExpiry( $ttl ) {
1076                 $this->mMaxAdaptiveExpiry = min( $ttl, $this->mMaxAdaptiveExpiry );
1077                 $this->updateCacheExpiry( $ttl );
1078         }
1079
1080         /**
1081          * Call this when parsing is done to lower the TTL based on low parse times
1082          *
1083          * @since 1.28
1084          */
1085         public function finalizeAdaptiveCacheExpiry() {
1086                 if ( is_infinite( $this->mMaxAdaptiveExpiry ) ) {
1087                         return; // not set
1088                 }
1089
1090                 $runtime = $this->getTimeSinceStart( 'wall' );
1091                 if ( is_float( $runtime ) ) {
1092                         $slope = ( self::SLOW_AR_TTL - self::FAST_AR_TTL )
1093                                 / ( self::PARSE_SLOW_SEC - self::PARSE_FAST_SEC );
1094                         // SLOW_AR_TTL = PARSE_SLOW_SEC * $slope + $point
1095                         $point = self::SLOW_AR_TTL - self::PARSE_SLOW_SEC * $slope;
1096
1097                         $adaptiveTTL = min(
1098                                 max( $slope * $runtime + $point, self::MIN_AR_TTL ),
1099                                 $this->mMaxAdaptiveExpiry
1100                         );
1101                         $this->updateCacheExpiry( $adaptiveTTL );
1102                 }
1103         }
1104
1105         public function __sleep() {
1106                 return array_diff(
1107                         array_keys( get_object_vars( $this ) ),
1108                         [ 'mParseStartTime' ]
1109                 );
1110         }
1111 }