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