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