includes/parser/ParserOptions.php

   1 <?php
   2 /**
   3  * Options for the PHP parser
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Parser
  22  */
  23 use Wikimedia\ScopedCallback;
  24
  25 /**
  26  * @brief Set options of the Parser
  27  *
  28  * All member variables are supposed to be private in theory, although in
  29  * practice this is not the case.
  30  *
  31  * @ingroup Parser
  32  */
  33 class ParserOptions {
  34
  35         /**
  36          * Interlanguage links are removed and returned in an array
  37          */
  38         private $mInterwikiMagic;
  39
  40         /**
  41          * Allow external images inline?
  42          */
  43         private $mAllowExternalImages;
  44
  45         /**
  46          * If not, any exception?
  47          */
  48         private $mAllowExternalImagesFrom;
  49
  50         /**
  51          * If not or it doesn't match, should we check an on-wiki whitelist?
  52          */
  53         private $mEnableImageWhitelist;
  54
  55         /**
  56          * Date format index
  57          */
  58         private $mDateFormat = null;
  59
  60         /**
  61          * Create "edit section" links?
  62          */
  63         private $mEditSection = true;
  64
  65         /**
  66          * Allow inclusion of special pages?
  67          */
  68         private $mAllowSpecialInclusion;
  69
  70         /**
  71          * Use tidy to cleanup output HTML?
  72          */
  73         private $mTidy = false;
  74
  75         /**
  76          * Which lang to call for PLURAL and GRAMMAR
  77          */
  78         private $mInterfaceMessage = false;
  79
  80         /**
  81          * Overrides $mInterfaceMessage with arbitrary language
  82          */
  83         private $mTargetLanguage = null;
  84
  85         /**
  86          * Maximum size of template expansions, in bytes
  87          */
  88         private $mMaxIncludeSize;
  89
  90         /**
  91          * Maximum number of nodes touched by PPFrame::expand()
  92          */
  93         private $mMaxPPNodeCount;
  94
  95         /**
  96          * Maximum number of nodes generated by Preprocessor::preprocessToObj()
  97          */
  98         private $mMaxGeneratedPPNodeCount;
  99
 100         /**
 101          * Maximum recursion depth in PPFrame::expand()
 102          */
 103         private $mMaxPPExpandDepth;
 104
 105         /**
 106          * Maximum recursion depth for templates within templates
 107          */
 108         private $mMaxTemplateDepth;
 109
 110         /**
 111          * Maximum number of calls per parse to expensive parser functions
 112          */
 113         private $mExpensiveParserFunctionLimit;
 114
 115         /**
 116          * Remove HTML comments. ONLY APPLIES TO PREPROCESS OPERATIONS
 117          */
 118         private $mRemoveComments = true;
 119
 120         /**
 121          * @var callable Callback for current revision fetching; first argument to call_user_func().
 122          */
 123         private $mCurrentRevisionCallback =
 124                 [ 'Parser', 'statelessFetchRevision' ];
 125
 126         /**
 127          * @var callable Callback for template fetching; first argument to call_user_func().
 128          */
 129         private $mTemplateCallback =
 130                 [ 'Parser', 'statelessFetchTemplate' ];
 131
 132         /**
 133          * @var callable|null Callback to generate a guess for {{REVISIONID}}
 134          */
 135         private $mSpeculativeRevIdCallback;
 136
 137         /**
 138          * Enable limit report in an HTML comment on output
 139          */
 140         private $mEnableLimitReport = false;
 141
 142         /**
 143          * Timestamp used for {{CURRENTDAY}} etc.
 144          */
 145         private $mTimestamp;
 146
 147         /**
 148          * Target attribute for external links
 149          */
 150         private $mExternalLinkTarget;
 151
 152         /**
 153          * Clean up signature texts?
 154          * @see Parser::cleanSig
 155          */
 156         private $mCleanSignatures;
 157
 158         /**
 159          * Transform wiki markup when saving the page?
 160          */
 161         private $mPreSaveTransform = true;
 162
 163         /**
 164          * Whether content conversion should be disabled
 165          */
 166         private $mDisableContentConversion;
 167
 168         /**
 169          * Whether title conversion should be disabled
 170          */
 171         private $mDisableTitleConversion;
 172
 173         /**
 174          * Automatically number headings?
 175          */
 176         private $mNumberHeadings;
 177
 178         /**
 179          * Thumb size preferred by the user.
 180          */
 181         private $mThumbSize;
 182
 183         /**
 184          * Maximum article size of an article to be marked as "stub"
 185          */
 186         private $mStubThreshold;
 187
 188         /**
 189          * Language object of the User language.
 190          */
 191         private $mUserLang;
 192
 193         /**
 194          * @var User
 195          * Stored user object
 196          */
 197         private $mUser;
 198
 199         /**
 200          * Parsing the page for a "preview" operation?
 201          */
 202         private $mIsPreview = false;
 203
 204         /**
 205          * Parsing the page for a "preview" operation on a single section?
 206          */
 207         private $mIsSectionPreview = false;
 208
 209         /**
 210          * Parsing the printable version of the page?
 211          */
 212         private $mIsPrintable = false;
 213
 214         /**
 215          * Extra key that should be present in the caching key.
 216          */
 217         private $mExtraKey = '';
 218
 219         /**
 220          * Are magic ISBN links enabled?
 221          */
 222         private $mMagicISBNLinks = true;
 223
 224         /**
 225          * Are magic PMID links enabled?
 226          */
 227         private $mMagicPMIDLinks = true;
 228
 229         /**
 230          * Are magic RFC links enabled?
 231          */
 232         private $mMagicRFCLinks = true;
 233
 234         /**
 235          * Function to be called when an option is accessed.
 236          */
 237         private $onAccessCallback = null;
 238
 239         /**
 240          * If the page being parsed is a redirect, this should hold the redirect
 241          * target.
 242          * @var Title|null
 243          */
 244         private $redirectTarget = null;
 245
 246         public function getInterwikiMagic() {
 247                 return $this->mInterwikiMagic;
 248         }
 249
 250         public function getAllowExternalImages() {
 251                 return $this->mAllowExternalImages;
 252         }
 253
 254         public function getAllowExternalImagesFrom() {
 255                 return $this->mAllowExternalImagesFrom;
 256         }
 257
 258         public function getEnableImageWhitelist() {
 259                 return $this->mEnableImageWhitelist;
 260         }
 261
 262         public function getEditSection() {
 263                 return $this->mEditSection;
 264         }
 265
 266         public function getNumberHeadings() {
 267                 $this->optionUsed( 'numberheadings' );
 268
 269                 return $this->mNumberHeadings;
 270         }
 271
 272         public function getAllowSpecialInclusion() {
 273                 return $this->mAllowSpecialInclusion;
 274         }
 275
 276         public function getTidy() {
 277                 return $this->mTidy;
 278         }
 279
 280         public function getInterfaceMessage() {
 281                 return $this->mInterfaceMessage;
 282         }
 283
 284         public function getTargetLanguage() {
 285                 return $this->mTargetLanguage;
 286         }
 287
 288         public function getMaxIncludeSize() {
 289                 return $this->mMaxIncludeSize;
 290         }
 291
 292         public function getMaxPPNodeCount() {
 293                 return $this->mMaxPPNodeCount;
 294         }
 295
 296         public function getMaxGeneratedPPNodeCount() {
 297                 return $this->mMaxGeneratedPPNodeCount;
 298         }
 299
 300         public function getMaxPPExpandDepth() {
 301                 return $this->mMaxPPExpandDepth;
 302         }
 303
 304         public function getMaxTemplateDepth() {
 305                 return $this->mMaxTemplateDepth;
 306         }
 307
 308         /* @since 1.20 */
 309         public function getExpensiveParserFunctionLimit() {
 310                 return $this->mExpensiveParserFunctionLimit;
 311         }
 312
 313         public function getRemoveComments() {
 314                 return $this->mRemoveComments;
 315         }
 316
 317         /* @since 1.24 */
 318         public function getCurrentRevisionCallback() {
 319                 return $this->mCurrentRevisionCallback;
 320         }
 321
 322         public function getTemplateCallback() {
 323                 return $this->mTemplateCallback;
 324         }
 325
 326         /** @since 1.28 */
 327         public function getSpeculativeRevIdCallback() {
 328                 return $this->mSpeculativeRevIdCallback;
 329         }
 330
 331         public function getEnableLimitReport() {
 332                 return $this->mEnableLimitReport;
 333         }
 334
 335         public function getCleanSignatures() {
 336                 return $this->mCleanSignatures;
 337         }
 338
 339         public function getExternalLinkTarget() {
 340                 return $this->mExternalLinkTarget;
 341         }
 342
 343         public function getDisableContentConversion() {
 344                 return $this->mDisableContentConversion;
 345         }
 346
 347         public function getDisableTitleConversion() {
 348                 return $this->mDisableTitleConversion;
 349         }
 350
 351         public function getThumbSize() {
 352                 $this->optionUsed( 'thumbsize' );
 353
 354                 return $this->mThumbSize;
 355         }
 356
 357         public function getStubThreshold() {
 358                 $this->optionUsed( 'stubthreshold' );
 359
 360                 return $this->mStubThreshold;
 361         }
 362
 363         public function getIsPreview() {
 364                 return $this->mIsPreview;
 365         }
 366
 367         public function getIsSectionPreview() {
 368                 return $this->mIsSectionPreview;
 369         }
 370
 371         public function getIsPrintable() {
 372                 $this->optionUsed( 'printable' );
 373
 374                 return $this->mIsPrintable;
 375         }
 376
 377         public function getUser() {
 378                 return $this->mUser;
 379         }
 380
 381         public function getPreSaveTransform() {
 382                 return $this->mPreSaveTransform;
 383         }
 384
 385         public function getDateFormat() {
 386                 $this->optionUsed( 'dateformat' );
 387                 if ( !isset( $this->mDateFormat ) ) {
 388                         $this->mDateFormat = $this->mUser->getDatePreference();
 389                 }
 390                 return $this->mDateFormat;
 391         }
 392
 393         public function getTimestamp() {
 394                 if ( !isset( $this->mTimestamp ) ) {
 395                         $this->mTimestamp = wfTimestampNow();
 396                 }
 397                 return $this->mTimestamp;
 398         }
 399
 400         /**
 401          * Get the user language used by the parser for this page and split the parser cache.
 402          *
 403          * @warning: Calling this causes the parser cache to be fragmented by user language!
 404          * To avoid cache fragmentation, output should not depend on the user language.
 405          * Use Parser::getFunctionLang() or Parser::getTargetLanguage() instead!
 406          *
 407          * @note This function will trigger a cache fragmentation by recording the
 408          * 'userlang' option, see optionUsed(). This is done to avoid cache pollution
 409          * when the page is rendered based on the language of the user.
 410          *
 411          * @note When saving, this will return the default language instead of the user's.
 412          * {{int: }} uses this which used to produce inconsistent link tables (T16404).
 413          *
 414          * @return Language
 415          * @since 1.19
 416          */
 417         public function getUserLangObj() {
 418                 $this->optionUsed( 'userlang' );
 419                 return $this->mUserLang;
 420         }
 421
 422         /**
 423          * Same as getUserLangObj() but returns a string instead.
 424          *
 425          * @warning: Calling this causes the parser cache to be fragmented by user language!
 426          * To avoid cache fragmentation, output should not depend on the user language.
 427          * Use Parser::getFunctionLang() or Parser::getTargetLanguage() instead!
 428          *
 429          * @see getUserLangObj()
 430          *
 431          * @return string Language code
 432          * @since 1.17
 433          */
 434         public function getUserLang() {
 435                 return $this->getUserLangObj()->getCode();
 436         }
 437
 438         /**
 439          * @since 1.28
 440          * @return bool
 441          */
 442         public function getMagicISBNLinks() {
 443                 return $this->mMagicISBNLinks;
 444         }
 445
 446         /**
 447          * @since 1.28
 448          * @return bool
 449          */
 450         public function getMagicPMIDLinks() {
 451                 return $this->mMagicPMIDLinks;
 452         }
 453         /**
 454          * @since 1.28
 455          * @return bool
 456          */
 457         public function getMagicRFCLinks() {
 458                 return $this->mMagicRFCLinks;
 459         }
 460         public function setInterwikiMagic( $x ) {
 461                 return wfSetVar( $this->mInterwikiMagic, $x );
 462         }
 463
 464         public function setAllowExternalImages( $x ) {
 465                 return wfSetVar( $this->mAllowExternalImages, $x );
 466         }
 467
 468         public function setAllowExternalImagesFrom( $x ) {
 469                 return wfSetVar( $this->mAllowExternalImagesFrom, $x );
 470         }
 471
 472         public function setEnableImageWhitelist( $x ) {
 473                 return wfSetVar( $this->mEnableImageWhitelist, $x );
 474         }
 475
 476         public function setDateFormat( $x ) {
 477                 return wfSetVar( $this->mDateFormat, $x );
 478         }
 479
 480         public function setEditSection( $x ) {
 481                 return wfSetVar( $this->mEditSection, $x );
 482         }
 483
 484         public function setNumberHeadings( $x ) {
 485                 return wfSetVar( $this->mNumberHeadings, $x );
 486         }
 487
 488         public function setAllowSpecialInclusion( $x ) {
 489                 return wfSetVar( $this->mAllowSpecialInclusion, $x );
 490         }
 491
 492         public function setTidy( $x ) {
 493                 return wfSetVar( $this->mTidy, $x );
 494         }
 495
 496         public function setInterfaceMessage( $x ) {
 497                 return wfSetVar( $this->mInterfaceMessage, $x );
 498         }
 499
 500         public function setTargetLanguage( $x ) {
 501                 return wfSetVar( $this->mTargetLanguage, $x, true );
 502         }
 503
 504         public function setMaxIncludeSize( $x ) {
 505                 return wfSetVar( $this->mMaxIncludeSize, $x );
 506         }
 507
 508         public function setMaxPPNodeCount( $x ) {
 509                 return wfSetVar( $this->mMaxPPNodeCount, $x );
 510         }
 511
 512         public function setMaxGeneratedPPNodeCount( $x ) {
 513                 return wfSetVar( $this->mMaxGeneratedPPNodeCount, $x );
 514         }
 515
 516         public function setMaxTemplateDepth( $x ) {
 517                 return wfSetVar( $this->mMaxTemplateDepth, $x );
 518         }
 519
 520         /* @since 1.20 */
 521         public function setExpensiveParserFunctionLimit( $x ) {
 522                 return wfSetVar( $this->mExpensiveParserFunctionLimit, $x );
 523         }
 524
 525         public function setRemoveComments( $x ) {
 526                 return wfSetVar( $this->mRemoveComments, $x );
 527         }
 528
 529         /* @since 1.24 */
 530         public function setCurrentRevisionCallback( $x ) {
 531                 return wfSetVar( $this->mCurrentRevisionCallback, $x );
 532         }
 533
 534         /** @since 1.28 */
 535         public function setSpeculativeRevIdCallback( $x ) {
 536                 return wfSetVar( $this->mSpeculativeRevIdCallback, $x );
 537         }
 538
 539         public function setTemplateCallback( $x ) {
 540                 return wfSetVar( $this->mTemplateCallback, $x );
 541         }
 542
 543         public function enableLimitReport( $x = true ) {
 544                 return wfSetVar( $this->mEnableLimitReport, $x );
 545         }
 546
 547         public function setTimestamp( $x ) {
 548                 return wfSetVar( $this->mTimestamp, $x );
 549         }
 550
 551         public function setCleanSignatures( $x ) {
 552                 return wfSetVar( $this->mCleanSignatures, $x );
 553         }
 554
 555         public function setExternalLinkTarget( $x ) {
 556                 return wfSetVar( $this->mExternalLinkTarget, $x );
 557         }
 558
 559         public function disableContentConversion( $x = true ) {
 560                 return wfSetVar( $this->mDisableContentConversion, $x );
 561         }
 562
 563         public function disableTitleConversion( $x = true ) {
 564                 return wfSetVar( $this->mDisableTitleConversion, $x );
 565         }
 566
 567         public function setUserLang( $x ) {
 568                 if ( is_string( $x ) ) {
 569                         $x = Language::factory( $x );
 570                 }
 571
 572                 return wfSetVar( $this->mUserLang, $x );
 573         }
 574
 575         public function setThumbSize( $x ) {
 576                 return wfSetVar( $this->mThumbSize, $x );
 577         }
 578
 579         public function setStubThreshold( $x ) {
 580                 return wfSetVar( $this->mStubThreshold, $x );
 581         }
 582
 583         public function setPreSaveTransform( $x ) {
 584                 return wfSetVar( $this->mPreSaveTransform, $x );
 585         }
 586
 587         public function setIsPreview( $x ) {
 588                 return wfSetVar( $this->mIsPreview, $x );
 589         }
 590
 591         public function setIsSectionPreview( $x ) {
 592                 return wfSetVar( $this->mIsSectionPreview, $x );
 593         }
 594
 595         public function setIsPrintable( $x ) {
 596                 return wfSetVar( $this->mIsPrintable, $x );
 597         }
 598
 599         /**
 600          * Set the redirect target.
 601          *
 602          * Note that setting or changing this does not *make* the page a redirect
 603          * or change its target, it merely records the information for reference
 604          * during the parse.
 605          *
 606          * @since 1.24
 607          * @param Title|null $title
 608          */
 609         function setRedirectTarget( $title ) {
 610                 $this->redirectTarget = $title;
 611         }
 612
 613         /**
 614          * Get the previously-set redirect target.
 615          *
 616          * @since 1.24
 617          * @return Title|null
 618          */
 619         function getRedirectTarget() {
 620                 return $this->redirectTarget;
 621         }
 622
 623         /**
 624          * Extra key that should be present in the parser cache key.
 625          * @param string $key
 626          */
 627         public function addExtraKey( $key ) {
 628                 $this->mExtraKey .= '!' . $key;
 629         }
 630
 631         /**
 632          * Constructor
 633          * @param User $user
 634          * @param Language $lang
 635          */
 636         public function __construct( $user = null, $lang = null ) {
 637                 if ( $user === null ) {
 638                         global $wgUser;
 639                         if ( $wgUser === null ) {
 640                                 $user = new User;
 641                         } else {
 642                                 $user = $wgUser;
 643                         }
 644                 }
 645                 if ( $lang === null ) {
 646                         global $wgLang;
 647                         if ( !StubObject::isRealObject( $wgLang ) ) {
 648                                 $wgLang->_unstub();
 649                         }
 650                         $lang = $wgLang;
 651                 }
 652                 $this->initialiseFromUser( $user, $lang );
 653         }
 654
 655         /**
 656          * Get a ParserOptions object for an anonymous user
 657          * @since 1.27
 658          * @return ParserOptions
 659          */
 660         public static function newFromAnon() {
 661                 global $wgContLang;
 662                 return new ParserOptions( new User, $wgContLang );
 663         }
 664
 665         /**
 666          * Get a ParserOptions object from a given user.
 667          * Language will be taken from $wgLang.
 668          *
 669          * @param User $user
 670          * @return ParserOptions
 671          */
 672         public static function newFromUser( $user ) {
 673                 return new ParserOptions( $user );
 674         }
 675
 676         /**
 677          * Get a ParserOptions object from a given user and language
 678          *
 679          * @param User $user
 680          * @param Language $lang
 681          * @return ParserOptions
 682          */
 683         public static function newFromUserAndLang( User $user, Language $lang ) {
 684                 return new ParserOptions( $user, $lang );
 685         }
 686
 687         /**
 688          * Get a ParserOptions object from a IContextSource object
 689          *
 690          * @param IContextSource $context
 691          * @return ParserOptions
 692          */
 693         public static function newFromContext( IContextSource $context ) {
 694                 return new ParserOptions( $context->getUser(), $context->getLanguage() );
 695         }
 696
 697         /**
 698          * Get user options
 699          *
 700          * @param User $user
 701          * @param Language $lang
 702          */
 703         private function initialiseFromUser( $user, $lang ) {
 704                 global $wgInterwikiMagic, $wgAllowExternalImages,
 705                         $wgAllowExternalImagesFrom, $wgEnableImageWhitelist, $wgAllowSpecialInclusion,
 706                         $wgMaxArticleSize, $wgMaxPPNodeCount, $wgMaxTemplateDepth, $wgMaxPPExpandDepth,
 707                         $wgCleanSignatures, $wgExternalLinkTarget, $wgExpensiveParserFunctionLimit,
 708                         $wgMaxGeneratedPPNodeCount, $wgDisableLangConversion, $wgDisableTitleConversion,
 709                         $wgEnableMagicLinks;
 710
 711                 // *UPDATE* ParserOptions::matches() if any of this changes as needed
 712                 $this->mInterwikiMagic = $wgInterwikiMagic;
 713                 $this->mAllowExternalImages = $wgAllowExternalImages;
 714                 $this->mAllowExternalImagesFrom = $wgAllowExternalImagesFrom;
 715                 $this->mEnableImageWhitelist = $wgEnableImageWhitelist;
 716                 $this->mAllowSpecialInclusion = $wgAllowSpecialInclusion;
 717                 $this->mMaxIncludeSize = $wgMaxArticleSize * 1024;
 718                 $this->mMaxPPNodeCount = $wgMaxPPNodeCount;
 719                 $this->mMaxGeneratedPPNodeCount = $wgMaxGeneratedPPNodeCount;
 720                 $this->mMaxPPExpandDepth = $wgMaxPPExpandDepth;
 721                 $this->mMaxTemplateDepth = $wgMaxTemplateDepth;
 722                 $this->mExpensiveParserFunctionLimit = $wgExpensiveParserFunctionLimit;
 723                 $this->mCleanSignatures = $wgCleanSignatures;
 724                 $this->mExternalLinkTarget = $wgExternalLinkTarget;
 725                 $this->mDisableContentConversion = $wgDisableLangConversion;
 726                 $this->mDisableTitleConversion = $wgDisableLangConversion || $wgDisableTitleConversion;
 727                 $this->mMagicISBNLinks = $wgEnableMagicLinks['ISBN'];
 728                 $this->mMagicPMIDLinks = $wgEnableMagicLinks['PMID'];
 729                 $this->mMagicRFCLinks = $wgEnableMagicLinks['RFC'];
 730
 731                 $this->mUser = $user;
 732                 $this->mNumberHeadings = $user->getOption( 'numberheadings' );
 733                 $this->mThumbSize = $user->getOption( 'thumbsize' );
 734                 $this->mStubThreshold = $user->getStubThreshold();
 735                 $this->mUserLang = $lang;
 736         }
 737
 738         /**
 739          * Check if these options match that of another options set
 740          *
 741          * This ignores report limit settings that only affect HTML comments
 742          *
 743          * @param ParserOptions $other
 744          * @return bool
 745          * @since 1.25
 746          */
 747         public function matches( ParserOptions $other ) {
 748                 $fields = array_keys( get_class_vars( __CLASS__ ) );
 749                 $fields = array_diff( $fields, [
 750                         'mEnableLimitReport', // only effects HTML comments
 751                         'onAccessCallback', // only used for ParserOutput option tracking
 752                 ] );
 753                 foreach ( $fields as $field ) {
 754                         if ( !is_object( $this->$field ) && $this->$field !== $other->$field ) {
 755                                 return false;
 756                         }
 757                 }
 758                 // Check the object and lazy-loaded options
 759                 return (
 760                         $this->mUserLang->equals( $other->mUserLang ) &&
 761                         $this->getDateFormat() === $other->getDateFormat()
 762                 );
 763         }
 764
 765         /**
 766          * Registers a callback for tracking which ParserOptions which are used.
 767          * This is a private API with the parser.
 768          * @param callable $callback
 769          */
 770         public function registerWatcher( $callback ) {
 771                 $this->onAccessCallback = $callback;
 772         }
 773
 774         /**
 775          * Called when an option is accessed.
 776          * Calls the watcher that was set using registerWatcher().
 777          * Typically, the watcher callback is ParserOutput::registerOption().
 778          * The information registered that way will be used by ParserCache::save().
 779          *
 780          * @param string $optionName Name of the option
 781          */
 782         public function optionUsed( $optionName ) {
 783                 if ( $this->onAccessCallback ) {
 784                         call_user_func( $this->onAccessCallback, $optionName );
 785                 }
 786         }
 787
 788         /**
 789          * Returns the full array of options that would have been used by
 790          * in 1.16.
 791          * Used to get the old parser cache entries when available.
 792          * @return array
 793          */
 794         public static function legacyOptions() {
 795                 return [
 796                         'stubthreshold',
 797                         'numberheadings',
 798                         'userlang',
 799                         'thumbsize',
 800                         'editsection',
 801                         'printable'
 802                 ];
 803         }
 804
 805         /**
 806          * Generate a hash string with the values set on these ParserOptions
 807          * for the keys given in the array.
 808          * This will be used as part of the hash key for the parser cache,
 809          * so users sharing the options with vary for the same page share
 810          * the same cached data safely.
 811          *
 812          * Extensions which require it should install 'PageRenderingHash' hook,
 813          * which will give them a chance to modify this key based on their own
 814          * settings.
 815          *
 816          * @since 1.17
 817          * @param array $forOptions
 818          * @param Title $title Used to get the content language of the page (since r97636)
 819          * @return string Page rendering hash
 820          */
 821         public function optionsHash( $forOptions, $title = null ) {
 822                 global $wgRenderHashAppend;
 823
 824                 // FIXME: Once the cache key is reorganized this argument
 825                 // can be dropped. It was used when the math extension was
 826                 // part of core.
 827                 $confstr = '*';
 828
 829                 // Space assigned for the stubthreshold but unused
 830                 // since it disables the parser cache, its value will always
 831                 // be 0 when this function is called by parsercache.
 832                 if ( in_array( 'stubthreshold', $forOptions ) ) {
 833                         $confstr .= '!' . $this->mStubThreshold;
 834                 } else {
 835                         $confstr .= '!*';
 836                 }
 837
 838                 if ( in_array( 'dateformat', $forOptions ) ) {
 839                         $confstr .= '!' . $this->getDateFormat();
 840                 }
 841
 842                 if ( in_array( 'numberheadings', $forOptions ) ) {
 843                         $confstr .= '!' . ( $this->mNumberHeadings ? '1' : '' );
 844                 } else {
 845                         $confstr .= '!*';
 846                 }
 847
 848                 if ( in_array( 'userlang', $forOptions ) ) {
 849                         $confstr .= '!' . $this->mUserLang->getCode();
 850                 } else {
 851                         $confstr .= '!*';
 852                 }
 853
 854                 if ( in_array( 'thumbsize', $forOptions ) ) {
 855                         $confstr .= '!' . $this->mThumbSize;
 856                 } else {
 857                         $confstr .= '!*';
 858                 }
 859
 860                 // add in language specific options, if any
 861                 // @todo FIXME: This is just a way of retrieving the url/user preferred variant
 862                 if ( !is_null( $title ) ) {
 863                         $confstr .= $title->getPageLanguage()->getExtraHashOptions();
 864                 } else {
 865                         global $wgContLang;
 866                         $confstr .= $wgContLang->getExtraHashOptions();
 867                 }
 868
 869                 $confstr .= $wgRenderHashAppend;
 870
 871                 // @note: as of Feb 2015, core never sets the editsection flag, since it uses
 872                 // <mw:editsection> tags to inject editsections on the fly. However, extensions
 873                 // may be using it by calling ParserOption::optionUsed resp. ParserOutput::registerOption
 874                 // directly. At least Wikibase does at this point in time.
 875                 if ( !in_array( 'editsection', $forOptions ) ) {
 876                         $confstr .= '!*';
 877                 } elseif ( !$this->mEditSection ) {
 878                         $confstr .= '!edit=0';
 879                 }
 880
 881                 if ( $this->mIsPrintable && in_array( 'printable', $forOptions ) ) {
 882                         $confstr .= '!printable=1';
 883                 }
 884
 885                 if ( $this->mExtraKey != '' ) {
 886                         $confstr .= $this->mExtraKey;
 887                 }
 888
 889                 // Give a chance for extensions to modify the hash, if they have
 890                 // extra options or other effects on the parser cache.
 891                 Hooks::run( 'PageRenderingHash', [ &$confstr, $this->getUser(), &$forOptions ] );
 892
 893                 // Make it a valid memcached key fragment
 894                 $confstr = str_replace( ' ', '_', $confstr );
 895
 896                 return $confstr;
 897         }
 898
 899         /**
 900          * Sets a hook to force that a page exists, and sets a current revision callback to return
 901          * a revision with custom content when the current revision of the page is requested.
 902          *
 903          * @since 1.25
 904          * @param Title $title
 905          * @param Content $content
 906          * @param User $user The user that the fake revision is attributed to
 907          * @return ScopedCallback to unset the hook
 908          */
 909         public function setupFakeRevision( $title, $content, $user ) {
 910                 $oldCallback = $this->setCurrentRevisionCallback(
 911                         function (
 912                                 $titleToCheck, $parser = false ) use ( $title, $content, $user, &$oldCallback
 913                         ) {
 914                                 if ( $titleToCheck->equals( $title ) ) {
 915                                         return new Revision( [
 916                                                 'page' => $title->getArticleID(),
 917                                                 'user_text' => $user->getName(),
 918                                                 'user' => $user->getId(),
 919                                                 'parent_id' => $title->getLatestRevID(),
 920                                                 'title' => $title,
 921                                                 'content' => $content
 922                                         ] );
 923                                 } else {
 924                                         return call_user_func( $oldCallback, $titleToCheck, $parser );
 925                                 }
 926                         }
 927                 );
 928
 929                 global $wgHooks;
 930                 $wgHooks['TitleExists'][] =
 931                         function ( $titleToCheck, &$exists ) use ( $title ) {
 932                                 if ( $titleToCheck->equals( $title ) ) {
 933                                         $exists = true;
 934                                 }
 935                         };
 936                 end( $wgHooks['TitleExists'] );
 937                 $key = key( $wgHooks['TitleExists'] );
 938                 LinkCache::singleton()->clearBadLink( $title->getPrefixedDBkey() );
 939                 return new ScopedCallback( function () use ( $title, $key ) {
 940                         global $wgHooks;
 941                         unset( $wgHooks['TitleExists'][$key] );
 942                         LinkCache::singleton()->clearLink( $title );
 943                 } );
 944         }
 945 }