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