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  * How to add an option in core:
  29  *  1. Add it to one of the arrays in ParserOptions::setDefaults()
  30  *  2. If necessary, add an entry to ParserOptions::$inCacheKey
  31  *  3. Add a getter and setter in the section for that.
  32  *
  33  * How to add an option in an extension:
  34  *  1. Use the 'ParserOptionsRegister' hook to register it.
  35  *  2. Where necessary, use $popt->getOption() and $popt->setOption()
  36  *     to access it.
  37  *
  38  * @ingroup Parser
  39  */
  40 class ParserOptions {
  41
  42         /**
  43          * Default values for all options that are relevant for caching.
  44          * @see self::getDefaults()
  45          * @var array|null
  46          */
  47         private static $defaults = null;
  48
  49         /**
  50          * Lazy-loaded options
  51          * @var callback[]
  52          */
  53         private static $lazyOptions = [
  54                 'dateformat' => [ __CLASS__, 'initDateFormat' ],
  55         ];
  56
  57         /**
  58          * Specify options that are included in the cache key
  59          * @var array
  60          */
  61         private static $inCacheKey = [
  62                 'dateformat' => true,
  63                 'numberheadings' => true,
  64                 'thumbsize' => true,
  65                 'stubthreshold' => true,
  66                 'printable' => true,
  67                 'userlang' => true,
  68                 'wrapclass' => true,
  69         ];
  70
  71         /**
  72          * Current values for all options that are relevant for caching.
  73          * @var array
  74          */
  75         private $options;
  76
  77         /**
  78          * Timestamp used for {{CURRENTDAY}} etc.
  79          * @var string|null
  80          * @note Caching based on parse time is handled externally
  81          */
  82         private $mTimestamp;
  83
  84         /**
  85          * The edit section flag is in ParserOptions for historical reasons, but
  86          * doesn't actually affect the parser output since Feb 2015.
  87          * @var bool
  88          */
  89         private $mEditSection = true;
  90
  91         /**
  92          * Stored user object
  93          * @var User
  94          * @todo Track this for caching somehow without fragmenting the cache insanely
  95          */
  96         private $mUser;
  97
  98         /**
  99          * Function to be called when an option is accessed.
 100          * @var callable|null
 101          * @note Used for collecting used options, does not affect caching
 102          */
 103         private $onAccessCallback = null;
 104
 105         /**
 106          * If the page being parsed is a redirect, this should hold the redirect
 107          * target.
 108          * @var Title|null
 109          * @todo Track this for caching somehow
 110          */
 111         private $redirectTarget = null;
 112
 113         /**
 114          * Appended to the options hash
 115          */
 116         private $mExtraKey = '';
 117
 118         /**
 119          * @name Option accessors
 120          * @{
 121          */
 122
 123         /**
 124          * Fetch an option, generically
 125          * @since 1.30
 126          * @param string $name Option name
 127          * @return mixed
 128          */
 129         public function getOption( $name ) {
 130                 if ( !array_key_exists( $name, $this->options ) ) {
 131                         throw new InvalidArgumentException( "Unknown parser option $name" );
 132                 }
 133
 134                 if ( isset( self::$lazyOptions[$name] ) && $this->options[$name] === null ) {
 135                         $this->options[$name] = call_user_func( self::$lazyOptions[$name], $this, $name );
 136                 }
 137                 if ( !empty( self::$inCacheKey[$name] ) ) {
 138                         $this->optionUsed( $name );
 139                 }
 140                 return $this->options[$name];
 141         }
 142
 143         /**
 144          * Set an option, generically
 145          * @since 1.30
 146          * @param string $name Option name
 147          * @param mixed $value New value. Passing null will set null, unlike many
 148          *  of the existing accessors which ignore null for historical reasons.
 149          * @return mixed Old value
 150          */
 151         public function setOption( $name, $value ) {
 152                 if ( !array_key_exists( $name, $this->options ) ) {
 153                         throw new InvalidArgumentException( "Unknown parser option $name" );
 154                 }
 155                 $old = $this->options[$name];
 156                 $this->options[$name] = $value;
 157                 return $old;
 158         }
 159
 160         /**
 161          * Legacy implementation
 162          * @since 1.30 For implementing legacy setters only. Don't use this in new code.
 163          * @deprecated since 1.30
 164          * @param string $name Option name
 165          * @param mixed $value New value. Passing null does not set the value.
 166          * @return mixed Old value
 167          */
 168         protected function setOptionLegacy( $name, $value ) {
 169                 if ( !array_key_exists( $name, $this->options ) ) {
 170                         throw new InvalidArgumentException( "Unknown parser option $name" );
 171                 }
 172                 return wfSetVar( $this->options[$name], $value );
 173         }
 174
 175         /**
 176          * Whether to extract interlanguage links
 177          *
 178          * When true, interlanguage links will be returned by
 179          * ParserOutput::getLanguageLinks() instead of generating link HTML.
 180          *
 181          * @return bool
 182          */
 183         public function getInterwikiMagic() {
 184                 return $this->getOption( 'interwikiMagic' );
 185         }
 186
 187         /**
 188          * Specify whether to extract interlanguage links
 189          * @param bool|null $x New value (null is no change)
 190          * @return bool Old value
 191          */
 192         public function setInterwikiMagic( $x ) {
 193                 return $this->setOptionLegacy( 'interwikiMagic', $x );
 194         }
 195
 196         /**
 197          * Allow all external images inline?
 198          * @return bool
 199          */
 200         public function getAllowExternalImages() {
 201                 return $this->getOption( 'allowExternalImages' );
 202         }
 203
 204         /**
 205          * Allow all external images inline?
 206          * @param bool|null $x New value (null is no change)
 207          * @return bool Old value
 208          */
 209         public function setAllowExternalImages( $x ) {
 210                 return $this->setOptionLegacy( 'allowExternalImages', $x );
 211         }
 212
 213         /**
 214          * External images to allow
 215          *
 216          * When self::getAllowExternalImages() is false
 217          *
 218          * @return string|string[] URLs to allow
 219          */
 220         public function getAllowExternalImagesFrom() {
 221                 return $this->getOption( 'allowExternalImagesFrom' );
 222         }
 223
 224         /**
 225          * External images to allow
 226          *
 227          * When self::getAllowExternalImages() is false
 228          *
 229          * @param string|string[]|null $x New value (null is no change)
 230          * @return string|string[] Old value
 231          */
 232         public function setAllowExternalImagesFrom( $x ) {
 233                 return $this->setOptionLegacy( 'allowExternalImagesFrom', $x );
 234         }
 235
 236         /**
 237          * Use the on-wiki external image whitelist?
 238          * @return bool
 239          */
 240         public function getEnableImageWhitelist() {
 241                 return $this->getOption( 'enableImageWhitelist' );
 242         }
 243
 244         /**
 245          * Use the on-wiki external image whitelist?
 246          * @param bool|null $x New value (null is no change)
 247          * @return bool Old value
 248          */
 249         public function setEnableImageWhitelist( $x ) {
 250                 return $this->setOptionLegacy( 'enableImageWhitelist', $x );
 251         }
 252
 253         /**
 254          * Automatically number headings?
 255          * @return bool
 256          */
 257         public function getNumberHeadings() {
 258                 return $this->getOption( 'numberheadings' );
 259         }
 260
 261         /**
 262          * Automatically number headings?
 263          * @param bool|null $x New value (null is no change)
 264          * @return bool Old value
 265          */
 266         public function setNumberHeadings( $x ) {
 267                 return $this->setOptionLegacy( 'numberheadings', $x );
 268         }
 269
 270         /**
 271          * Allow inclusion of special pages?
 272          * @return bool
 273          */
 274         public function getAllowSpecialInclusion() {
 275                 return $this->getOption( 'allowSpecialInclusion' );
 276         }
 277
 278         /**
 279          * Allow inclusion of special pages?
 280          * @param bool|null $x New value (null is no change)
 281          * @return bool Old value
 282          */
 283         public function setAllowSpecialInclusion( $x ) {
 284                 return $this->setOptionLegacy( 'allowSpecialInclusion', $x );
 285         }
 286
 287         /**
 288          * Use tidy to cleanup output HTML?
 289          * @return bool
 290          */
 291         public function getTidy() {
 292                 return $this->getOption( 'tidy' );
 293         }
 294
 295         /**
 296          * Use tidy to cleanup output HTML?
 297          * @param bool|null $x New value (null is no change)
 298          * @return bool Old value
 299          */
 300         public function setTidy( $x ) {
 301                 return $this->setOptionLegacy( 'tidy', $x );
 302         }
 303
 304         /**
 305          * Parsing an interface message?
 306          * @return bool
 307          */
 308         public function getInterfaceMessage() {
 309                 return $this->getOption( 'interfaceMessage' );
 310         }
 311
 312         /**
 313          * Parsing an interface message?
 314          * @param bool|null $x New value (null is no change)
 315          * @return bool Old value
 316          */
 317         public function setInterfaceMessage( $x ) {
 318                 return $this->setOptionLegacy( 'interfaceMessage', $x );
 319         }
 320
 321         /**
 322          * Target language for the parse
 323          * @return Language|null
 324          */
 325         public function getTargetLanguage() {
 326                 return $this->getOption( 'targetLanguage' );
 327         }
 328
 329         /**
 330          * Target language for the parse
 331          * @param Language|null $x New value
 332          * @return Language|null Old value
 333          */
 334         public function setTargetLanguage( $x ) {
 335                 return $this->setOption( 'targetLanguage', $x );
 336         }
 337
 338         /**
 339          * Maximum size of template expansions, in bytes
 340          * @return int
 341          */
 342         public function getMaxIncludeSize() {
 343                 return $this->getOption( 'maxIncludeSize' );
 344         }
 345
 346         /**
 347          * Maximum size of template expansions, in bytes
 348          * @param int|null $x New value (null is no change)
 349          * @return int Old value
 350          */
 351         public function setMaxIncludeSize( $x ) {
 352                 return $this->setOptionLegacy( 'maxIncludeSize', $x );
 353         }
 354
 355         /**
 356          * Maximum number of nodes touched by PPFrame::expand()
 357          * @return int
 358          */
 359         public function getMaxPPNodeCount() {
 360                 return $this->getOption( 'maxPPNodeCount' );
 361         }
 362
 363         /**
 364          * Maximum number of nodes touched by PPFrame::expand()
 365          * @param int|null $x New value (null is no change)
 366          * @return int Old value
 367          */
 368         public function setMaxPPNodeCount( $x ) {
 369                 return $this->setOptionLegacy( 'maxPPNodeCount', $x );
 370         }
 371
 372         /**
 373          * Maximum number of nodes generated by Preprocessor::preprocessToObj()
 374          * @return int
 375          */
 376         public function getMaxGeneratedPPNodeCount() {
 377                 return $this->getOption( 'maxGeneratedPPNodeCount' );
 378         }
 379
 380         /**
 381          * Maximum number of nodes generated by Preprocessor::preprocessToObj()
 382          * @param int|null $x New value (null is no change)
 383          * @return int
 384          */
 385         public function setMaxGeneratedPPNodeCount( $x ) {
 386                 return $this->setOptionLegacy( 'maxGeneratedPPNodeCount', $x );
 387         }
 388
 389         /**
 390          * Maximum recursion depth in PPFrame::expand()
 391          * @return int
 392          */
 393         public function getMaxPPExpandDepth() {
 394                 return $this->getOption( 'maxPPExpandDepth' );
 395         }
 396
 397         /**
 398          * Maximum recursion depth for templates within templates
 399          * @return int
 400          */
 401         public function getMaxTemplateDepth() {
 402                 return $this->getOption( 'maxTemplateDepth' );
 403         }
 404
 405         /**
 406          * Maximum recursion depth for templates within templates
 407          * @param int|null $x New value (null is no change)
 408          * @return int Old value
 409          */
 410         public function setMaxTemplateDepth( $x ) {
 411                 return $this->setOptionLegacy( 'maxTemplateDepth', $x );
 412         }
 413
 414         /**
 415          * Maximum number of calls per parse to expensive parser functions
 416          * @since 1.20
 417          * @return int
 418          */
 419         public function getExpensiveParserFunctionLimit() {
 420                 return $this->getOption( 'expensiveParserFunctionLimit' );
 421         }
 422
 423         /**
 424          * Maximum number of calls per parse to expensive parser functions
 425          * @since 1.20
 426          * @param int|null $x New value (null is no change)
 427          * @return int Old value
 428          */
 429         public function setExpensiveParserFunctionLimit( $x ) {
 430                 return $this->setOptionLegacy( 'expensiveParserFunctionLimit', $x );
 431         }
 432
 433         /**
 434          * Remove HTML comments
 435          * @warning Only applies to preprocess operations
 436          * @return bool
 437          */
 438         public function getRemoveComments() {
 439                 return $this->getOption( 'removeComments' );
 440         }
 441
 442         /**
 443          * Remove HTML comments
 444          * @warning Only applies to preprocess operations
 445          * @param bool|null $x New value (null is no change)
 446          * @return bool Old value
 447          */
 448         public function setRemoveComments( $x ) {
 449                 return $this->setOptionLegacy( 'removeComments', $x );
 450         }
 451
 452         /**
 453          * Enable limit report in an HTML comment on output
 454          * @return bool
 455          */
 456         public function getEnableLimitReport() {
 457                 return $this->getOption( 'enableLimitReport' );
 458         }
 459
 460         /**
 461          * Enable limit report in an HTML comment on output
 462          * @param bool|null $x New value (null is no change)
 463          * @return bool Old value
 464          */
 465         public function enableLimitReport( $x = true ) {
 466                 return $this->setOptionLegacy( 'enableLimitReport', $x );
 467         }
 468
 469         /**
 470          * Clean up signature texts?
 471          * @see Parser::cleanSig
 472          * @return bool
 473          */
 474         public function getCleanSignatures() {
 475                 return $this->getOption( 'cleanSignatures' );
 476         }
 477
 478         /**
 479          * Clean up signature texts?
 480          * @see Parser::cleanSig
 481          * @param bool|null $x New value (null is no change)
 482          * @return bool Old value
 483          */
 484         public function setCleanSignatures( $x ) {
 485                 return $this->setOptionLegacy( 'cleanSignatures', $x );
 486         }
 487
 488         /**
 489          * Target attribute for external links
 490          * @return string
 491          */
 492         public function getExternalLinkTarget() {
 493                 return $this->getOption( 'externalLinkTarget' );
 494         }
 495
 496         /**
 497          * Target attribute for external links
 498          * @param string|null $x New value (null is no change)
 499          * @return string Old value
 500          */
 501         public function setExternalLinkTarget( $x ) {
 502                 return $this->setOptionLegacy( 'externalLinkTarget', $x );
 503         }
 504
 505         /**
 506          * Whether content conversion should be disabled
 507          * @return bool
 508          */
 509         public function getDisableContentConversion() {
 510                 return $this->getOption( 'disableContentConversion' );
 511         }
 512
 513         /**
 514          * Whether content conversion should be disabled
 515          * @param bool|null $x New value (null is no change)
 516          * @return bool Old value
 517          */
 518         public function disableContentConversion( $x = true ) {
 519                 return $this->setOptionLegacy( 'disableContentConversion', $x );
 520         }
 521
 522         /**
 523          * Whether title conversion should be disabled
 524          * @return bool
 525          */
 526         public function getDisableTitleConversion() {
 527                 return $this->getOption( 'disableTitleConversion' );
 528         }
 529
 530         /**
 531          * Whether title conversion should be disabled
 532          * @param bool|null $x New value (null is no change)
 533          * @return bool Old value
 534          */
 535         public function disableTitleConversion( $x = true ) {
 536                 return $this->setOptionLegacy( 'disableTitleConversion', $x );
 537         }
 538
 539         /**
 540          * Thumb size preferred by the user.
 541          * @return int
 542          */
 543         public function getThumbSize() {
 544                 return $this->getOption( 'thumbsize' );
 545         }
 546
 547         /**
 548          * Thumb size preferred by the user.
 549          * @param int|null $x New value (null is no change)
 550          * @return int Old value
 551          */
 552         public function setThumbSize( $x ) {
 553                 return $this->setOptionLegacy( 'thumbsize', $x );
 554         }
 555
 556         /**
 557          * Thumb size preferred by the user.
 558          * @return int
 559          */
 560         public function getStubThreshold() {
 561                 return $this->getOption( 'stubthreshold' );
 562         }
 563
 564         /**
 565          * Thumb size preferred by the user.
 566          * @param int|null $x New value (null is no change)
 567          * @return int Old value
 568          */
 569         public function setStubThreshold( $x ) {
 570                 return $this->setOptionLegacy( 'stubthreshold', $x );
 571         }
 572
 573         /**
 574          * Parsing the page for a "preview" operation?
 575          * @return bool
 576          */
 577         public function getIsPreview() {
 578                 return $this->getOption( 'isPreview' );
 579         }
 580
 581         /**
 582          * Parsing the page for a "preview" operation?
 583          * @param bool|null $x New value (null is no change)
 584          * @return bool Old value
 585          */
 586         public function setIsPreview( $x ) {
 587                 return $this->setOptionLegacy( 'isPreview', $x );
 588         }
 589
 590         /**
 591          * Parsing the page for a "preview" operation on a single section?
 592          * @return bool
 593          */
 594         public function getIsSectionPreview() {
 595                 return $this->getOption( 'isSectionPreview' );
 596         }
 597
 598         /**
 599          * Parsing the page for a "preview" operation on a single section?
 600          * @param bool|null $x New value (null is no change)
 601          * @return bool Old value
 602          */
 603         public function setIsSectionPreview( $x ) {
 604                 return $this->setOptionLegacy( 'isSectionPreview', $x );
 605         }
 606
 607         /**
 608          * Parsing the printable version of the page?
 609          * @return bool
 610          */
 611         public function getIsPrintable() {
 612                 return $this->getOption( 'printable' );
 613         }
 614
 615         /**
 616          * Parsing the printable version of the page?
 617          * @param bool|null $x New value (null is no change)
 618          * @return bool Old value
 619          */
 620         public function setIsPrintable( $x ) {
 621                 return $this->setOptionLegacy( 'printable', $x );
 622         }
 623
 624         /**
 625          * Transform wiki markup when saving the page?
 626          * @return bool
 627          */
 628         public function getPreSaveTransform() {
 629                 return $this->getOption( 'preSaveTransform' );
 630         }
 631
 632         /**
 633          * Transform wiki markup when saving the page?
 634          * @param bool|null $x New value (null is no change)
 635          * @return bool Old value
 636          */
 637         public function setPreSaveTransform( $x ) {
 638                 return $this->setOptionLegacy( 'preSaveTransform', $x );
 639         }
 640
 641         /**
 642          * Date format index
 643          * @return string
 644          */
 645         public function getDateFormat() {
 646                 return $this->getOption( 'dateformat' );
 647         }
 648
 649         /**
 650          * Lazy initializer for dateFormat
 651          */
 652         private static function initDateFormat( $popt ) {
 653                 return $popt->mUser->getDatePreference();
 654         }
 655
 656         /**
 657          * Date format index
 658          * @param string|null $x New value (null is no change)
 659          * @return string Old value
 660          */
 661         public function setDateFormat( $x ) {
 662                 return $this->setOptionLegacy( 'dateformat', $x );
 663         }
 664
 665         /**
 666          * Get the user language used by the parser for this page and split the parser cache.
 667          *
 668          * @warning: Calling this causes the parser cache to be fragmented by user language!
 669          * To avoid cache fragmentation, output should not depend on the user language.
 670          * Use Parser::getFunctionLang() or Parser::getTargetLanguage() instead!
 671          *
 672          * @note This function will trigger a cache fragmentation by recording the
 673          * 'userlang' option, see optionUsed(). This is done to avoid cache pollution
 674          * when the page is rendered based on the language of the user.
 675          *
 676          * @note When saving, this will return the default language instead of the user's.
 677          * {{int: }} uses this which used to produce inconsistent link tables (T16404).
 678          *
 679          * @return Language
 680          * @since 1.19
 681          */
 682         public function getUserLangObj() {
 683                 return $this->getOption( 'userlang' );
 684         }
 685
 686         /**
 687          * Same as getUserLangObj() but returns a string instead.
 688          *
 689          * @warning: Calling this causes the parser cache to be fragmented by user language!
 690          * To avoid cache fragmentation, output should not depend on the user language.
 691          * Use Parser::getFunctionLang() or Parser::getTargetLanguage() instead!
 692          *
 693          * @see getUserLangObj()
 694          *
 695          * @return string Language code
 696          * @since 1.17
 697          */
 698         public function getUserLang() {
 699                 return $this->getUserLangObj()->getCode();
 700         }
 701
 702         /**
 703          * Set the user language used by the parser for this page and split the parser cache.
 704          * @param string|Language $x New value
 705          * @return Language Old value
 706          */
 707         public function setUserLang( $x ) {
 708                 if ( is_string( $x ) ) {
 709                         $x = Language::factory( $x );
 710                 }
 711
 712                 return $this->setOptionLegacy( 'userlang', $x );
 713         }
 714
 715         /**
 716          * Are magic ISBN links enabled?
 717          * @since 1.28
 718          * @return bool
 719          */
 720         public function getMagicISBNLinks() {
 721                 return $this->getOption( 'magicISBNLinks' );
 722         }
 723
 724         /**
 725          * Are magic PMID links enabled?
 726          * @since 1.28
 727          * @return bool
 728          */
 729         public function getMagicPMIDLinks() {
 730                 return $this->getOption( 'magicPMIDLinks' );
 731         }
 732         /**
 733          * Are magic RFC links enabled?
 734          * @since 1.28
 735          * @return bool
 736          */
 737         public function getMagicRFCLinks() {
 738                 return $this->getOption( 'magicRFCLinks' );
 739         }
 740
 741         /**
 742          * If the wiki is configured to allow raw html ($wgRawHtml = true)
 743          * is it allowed in the specific case of parsing this page.
 744          *
 745          * This is meant to disable unsafe parser tags in cases where
 746          * a malicious user may control the input to the parser.
 747          *
 748          * @note This is expected to be true for normal pages even if the
 749          *  wiki has $wgRawHtml disabled in general. The setting only
 750          *  signifies that raw html would be unsafe in the current context
 751          *  provided that raw html is allowed at all.
 752          * @since 1.29
 753          * @return bool
 754          */
 755         public function getAllowUnsafeRawHtml() {
 756                 return $this->getOption( 'allowUnsafeRawHtml' );
 757         }
 758
 759         /**
 760          * If the wiki is configured to allow raw html ($wgRawHtml = true)
 761          * is it allowed in the specific case of parsing this page.
 762          * @see self::getAllowUnsafeRawHtml()
 763          * @since 1.29
 764          * @param bool|null Value to set or null to get current value
 765          * @return bool Current value for allowUnsafeRawHtml
 766          */
 767         public function setAllowUnsafeRawHtml( $x ) {
 768                 return $this->setOptionLegacy( 'allowUnsafeRawHtml', $x );
 769         }
 770
 771         /**
 772          * Class to use to wrap output from Parser::parse()
 773          * @since 1.30
 774          * @return string|bool
 775          */
 776         public function getWrapOutputClass() {
 777                 return $this->getOption( 'wrapclass' );
 778         }
 779
 780         /**
 781          * CSS class to use to wrap output from Parser::parse()
 782          * @since 1.30
 783          * @param string|bool $className Set false to disable wrapping.
 784          * @return string|bool Current value
 785          */
 786         public function setWrapOutputClass( $className ) {
 787                 if ( $className === true ) { // DWIM, they probably want the default class name
 788                         $className = 'mw-parser-output';
 789                 }
 790                 return $this->setOption( 'wrapclass', $className );
 791         }
 792
 793         /**
 794          * Callback for current revision fetching; first argument to call_user_func().
 795          * @since 1.24
 796          * @return callable
 797          */
 798         public function getCurrentRevisionCallback() {
 799                 return $this->getOption( 'currentRevisionCallback' );
 800         }
 801
 802         /**
 803          * Callback for current revision fetching; first argument to call_user_func().
 804          * @since 1.24
 805          * @param callable|null $x New value (null is no change)
 806          * @return callable Old value
 807          */
 808         public function setCurrentRevisionCallback( $x ) {
 809                 return $this->setOptionLegacy( 'currentRevisionCallback', $x );
 810         }
 811
 812         /**
 813          * Callback for template fetching; first argument to call_user_func().
 814          * @return callable
 815          */
 816         public function getTemplateCallback() {
 817                 return $this->getOption( 'templateCallback' );
 818         }
 819
 820         /**
 821          * Callback for template fetching; first argument to call_user_func().
 822          * @param callable|null $x New value (null is no change)
 823          * @return callable Old value
 824          */
 825         public function setTemplateCallback( $x ) {
 826                 return $this->setOptionLegacy( 'templateCallback', $x );
 827         }
 828
 829         /**
 830          * Callback to generate a guess for {{REVISIONID}}
 831          * @since 1.28
 832          * @return callable|null
 833          */
 834         public function getSpeculativeRevIdCallback() {
 835                 return $this->getOption( 'speculativeRevIdCallback' );
 836         }
 837
 838         /**
 839          * Callback to generate a guess for {{REVISIONID}}
 840          * @since 1.28
 841          * @param callable|null $x New value (null is no change)
 842          * @return callable|null Old value
 843          */
 844         public function setSpeculativeRevIdCallback( $x ) {
 845                 return $this->setOptionLegacy( 'speculativeRevIdCallback', $x );
 846         }
 847
 848         /**@}*/
 849
 850         /**
 851          * Timestamp used for {{CURRENTDAY}} etc.
 852          * @return string
 853          */
 854         public function getTimestamp() {
 855                 if ( !isset( $this->mTimestamp ) ) {
 856                         $this->mTimestamp = wfTimestampNow();
 857                 }
 858                 return $this->mTimestamp;
 859         }
 860
 861         /**
 862          * Timestamp used for {{CURRENTDAY}} etc.
 863          * @param string|null $x New value (null is no change)
 864          * @return string Old value
 865          */
 866         public function setTimestamp( $x ) {
 867                 return wfSetVar( $this->mTimestamp, $x );
 868         }
 869
 870         /**
 871          * Create "edit section" links?
 872          * @return bool
 873          */
 874         public function getEditSection() {
 875                 return $this->mEditSection;
 876         }
 877
 878         /**
 879          * Create "edit section" links?
 880          * @param bool|null $x New value (null is no change)
 881          * @return bool Old value
 882          */
 883         public function setEditSection( $x ) {
 884                 return wfSetVar( $this->mEditSection, $x );
 885         }
 886
 887         /**
 888          * Set the redirect target.
 889          *
 890          * Note that setting or changing this does not *make* the page a redirect
 891          * or change its target, it merely records the information for reference
 892          * during the parse.
 893          *
 894          * @since 1.24
 895          * @param Title|null $title
 896          */
 897         function setRedirectTarget( $title ) {
 898                 $this->redirectTarget = $title;
 899         }
 900
 901         /**
 902          * Get the previously-set redirect target.
 903          *
 904          * @since 1.24
 905          * @return Title|null
 906          */
 907         function getRedirectTarget() {
 908                 return $this->redirectTarget;
 909         }
 910
 911         /**
 912          * Extra key that should be present in the parser cache key.
 913          * @warning Consider registering your additional options with the
 914          *  ParserOptionsRegister hook instead of using this method.
 915          * @param string $key
 916          */
 917         public function addExtraKey( $key ) {
 918                 $this->mExtraKey .= '!' . $key;
 919         }
 920
 921         /**
 922          * Current user
 923          * @return User
 924          */
 925         public function getUser() {
 926                 return $this->mUser;
 927         }
 928
 929         /**
 930          * @warning For interaction with the parser cache, use
 931          *  WikiPage::makeParserOptions(), ContentHandler::makeParserOptions(), or
 932          *  ParserOptions::newCanonical() instead.
 933          * @param User $user
 934          * @param Language $lang
 935          */
 936         public function __construct( $user = null, $lang = null ) {
 937                 if ( $user === null ) {
 938                         global $wgUser;
 939                         if ( $wgUser === null ) {
 940                                 $user = new User;
 941                         } else {
 942                                 $user = $wgUser;
 943                         }
 944                 }
 945                 if ( $lang === null ) {
 946                         global $wgLang;
 947                         if ( !StubObject::isRealObject( $wgLang ) ) {
 948                                 $wgLang->_unstub();
 949                         }
 950                         $lang = $wgLang;
 951                 }
 952                 $this->initialiseFromUser( $user, $lang );
 953         }
 954
 955         /**
 956          * Get a ParserOptions object for an anonymous user
 957          * @warning For interaction with the parser cache, use
 958          *  WikiPage::makeParserOptions(), ContentHandler::makeParserOptions(), or
 959          *  ParserOptions::newCanonical() instead.
 960          * @since 1.27
 961          * @return ParserOptions
 962          */
 963         public static function newFromAnon() {
 964                 global $wgContLang;
 965                 return new ParserOptions( new User, $wgContLang );
 966         }
 967
 968         /**
 969          * Get a ParserOptions object from a given user.
 970          * Language will be taken from $wgLang.
 971          *
 972          * @warning For interaction with the parser cache, use
 973          *  WikiPage::makeParserOptions(), ContentHandler::makeParserOptions(), or
 974          *  ParserOptions::newCanonical() instead.
 975          * @param User $user
 976          * @return ParserOptions
 977          */
 978         public static function newFromUser( $user ) {
 979                 return new ParserOptions( $user );
 980         }
 981
 982         /**
 983          * Get a ParserOptions object from a given user and language
 984          *
 985          * @warning For interaction with the parser cache, use
 986          *  WikiPage::makeParserOptions(), ContentHandler::makeParserOptions(), or
 987          *  ParserOptions::newCanonical() instead.
 988          * @param User $user
 989          * @param Language $lang
 990          * @return ParserOptions
 991          */
 992         public static function newFromUserAndLang( User $user, Language $lang ) {
 993                 return new ParserOptions( $user, $lang );
 994         }
 995
 996         /**
 997          * Get a ParserOptions object from a IContextSource object
 998          *
 999          * @warning For interaction with the parser cache, use
1000          *  WikiPage::makeParserOptions(), ContentHandler::makeParserOptions(), or
1001          *  ParserOptions::newCanonical() instead.
1002          * @param IContextSource $context
1003          * @return ParserOptions
1004          */
1005         public static function newFromContext( IContextSource $context ) {
1006                 return new ParserOptions( $context->getUser(), $context->getLanguage() );
1007         }
1008
1009         /**
1010          * Creates a "canonical" ParserOptions object
1011          *
1012          * For historical reasons, certain options have default values that are
1013          * different from the canonical values used for caching.
1014          *
1015          * @since 1.30
1016          * @param User|null $user
1017          * @param Language|StubObject|null $lang
1018          * @return ParserOptions
1019          */
1020         public static function newCanonical( User $user = null, $lang = null ) {
1021                 $ret = new ParserOptions( $user, $lang );
1022                 foreach ( self::getCanonicalOverrides() as $k => $v ) {
1023                         $ret->setOption( $k, $v );
1024                 }
1025                 return $ret;
1026         }
1027
1028         /**
1029          * Get default option values
1030          * @warning If you change the default for an existing option (unless it's
1031          *  being overridden by self::getCanonicalOverrides()), all existing parser
1032          *  cache entries will be invalid. To avoid bugs, you'll need to handle
1033          *  that somehow (e.g. with the RejectParserCacheValue hook) because
1034          *  MediaWiki won't do it for you.
1035          * @return array
1036          */
1037         private static function getDefaults() {
1038                 global $wgInterwikiMagic, $wgAllowExternalImages,
1039                         $wgAllowExternalImagesFrom, $wgEnableImageWhitelist, $wgAllowSpecialInclusion,
1040                         $wgMaxArticleSize, $wgMaxPPNodeCount, $wgMaxTemplateDepth, $wgMaxPPExpandDepth,
1041                         $wgCleanSignatures, $wgExternalLinkTarget, $wgExpensiveParserFunctionLimit,
1042                         $wgMaxGeneratedPPNodeCount, $wgDisableLangConversion, $wgDisableTitleConversion,
1043                         $wgEnableMagicLinks, $wgContLang;
1044
1045                 if ( self::$defaults === null ) {
1046                         // *UPDATE* ParserOptions::matches() if any of this changes as needed
1047                         self::$defaults = [
1048                                 'dateformat' => null,
1049                                 'tidy' => false,
1050                                 'interfaceMessage' => false,
1051                                 'targetLanguage' => null,
1052                                 'removeComments' => true,
1053                                 'enableLimitReport' => false,
1054                                 'preSaveTransform' => true,
1055                                 'isPreview' => false,
1056                                 'isSectionPreview' => false,
1057                                 'printable' => false,
1058                                 'allowUnsafeRawHtml' => true,
1059                                 'wrapclass' => 'mw-parser-output',
1060                                 'currentRevisionCallback' => [ 'Parser', 'statelessFetchRevision' ],
1061                                 'templateCallback' => [ 'Parser', 'statelessFetchTemplate' ],
1062                                 'speculativeRevIdCallback' => null,
1063                         ];
1064
1065                         Hooks::run( 'ParserOptionsRegister', [
1066                                 &self::$defaults,
1067                                 &self::$inCacheKey,
1068                                 &self::$lazyOptions,
1069                         ] );
1070
1071                         ksort( self::$inCacheKey );
1072                 }
1073
1074                 // Unit tests depend on being able to modify the globals at will
1075                 return self::$defaults + [
1076                         'interwikiMagic' => $wgInterwikiMagic,
1077                         'allowExternalImages' => $wgAllowExternalImages,
1078                         'allowExternalImagesFrom' => $wgAllowExternalImagesFrom,
1079                         'enableImageWhitelist' => $wgEnableImageWhitelist,
1080                         'allowSpecialInclusion' => $wgAllowSpecialInclusion,
1081                         'maxIncludeSize' => $wgMaxArticleSize * 1024,
1082                         'maxPPNodeCount' => $wgMaxPPNodeCount,
1083                         'maxGeneratedPPNodeCount' => $wgMaxGeneratedPPNodeCount,
1084                         'maxPPExpandDepth' => $wgMaxPPExpandDepth,
1085                         'maxTemplateDepth' => $wgMaxTemplateDepth,
1086                         'expensiveParserFunctionLimit' => $wgExpensiveParserFunctionLimit,
1087                         'externalLinkTarget' => $wgExternalLinkTarget,
1088                         'cleanSignatures' => $wgCleanSignatures,
1089                         'disableContentConversion' => $wgDisableLangConversion,
1090                         'disableTitleConversion' => $wgDisableLangConversion || $wgDisableTitleConversion,
1091                         'magicISBNLinks' => $wgEnableMagicLinks['ISBN'],
1092                         'magicPMIDLinks' => $wgEnableMagicLinks['PMID'],
1093                         'magicRFCLinks' => $wgEnableMagicLinks['RFC'],
1094                         'numberheadings' => User::getDefaultOption( 'numberheadings' ),
1095                         'thumbsize' => User::getDefaultOption( 'thumbsize' ),
1096                         'stubthreshold' => 0,
1097                         'userlang' => $wgContLang,
1098                 ];
1099         }
1100
1101         /**
1102          * Get "canonical" non-default option values
1103          * @see self::newCanonical
1104          * @warning If you change the override for an existing option, all existing
1105          *  parser cache entries will be invalid. To avoid bugs, you'll need to
1106          *  handle that somehow (e.g. with the RejectParserCacheValue hook) because
1107          *  MediaWiki won't do it for you.
1108          * @return array
1109          */
1110         private static function getCanonicalOverrides() {
1111                 global $wgEnableParserLimitReporting;
1112
1113                 return [
1114                         'tidy' => true,
1115                         'enableLimitReport' => $wgEnableParserLimitReporting,
1116                 ];
1117         }
1118
1119         /**
1120          * Get user options
1121          *
1122          * @param User $user
1123          * @param Language $lang
1124          */
1125         private function initialiseFromUser( $user, $lang ) {
1126                 $this->options = self::getDefaults();
1127
1128                 $this->mUser = $user;
1129                 $this->options['numberheadings'] = $user->getOption( 'numberheadings' );
1130                 $this->options['thumbsize'] = $user->getOption( 'thumbsize' );
1131                 $this->options['stubthreshold'] = $user->getStubThreshold();
1132                 $this->options['userlang'] = $lang;
1133         }
1134
1135         /**
1136          * Check if these options match that of another options set
1137          *
1138          * This ignores report limit settings that only affect HTML comments
1139          *
1140          * @param ParserOptions $other
1141          * @return bool
1142          * @since 1.25
1143          */
1144         public function matches( ParserOptions $other ) {
1145                 // Populate lazy options
1146                 foreach ( self::$lazyOptions as $name => $callback ) {
1147                         if ( $this->options[$name] === null ) {
1148                                 $this->options[$name] = call_user_func( $callback, $this, $name );
1149                         }
1150                         if ( $other->options[$name] === null ) {
1151                                 $other->options[$name] = call_user_func( $callback, $other, $name );
1152                         }
1153                 }
1154
1155                 // Compare most options
1156                 $options = array_keys( $this->options );
1157                 $options = array_diff( $options, [
1158                         'enableLimitReport', // only affects HTML comments
1159                 ] );
1160                 foreach ( $options as $option ) {
1161                         $o1 = $this->optionToString( $this->options[$option] );
1162                         $o2 = $this->optionToString( $other->options[$option] );
1163                         if ( $o1 !== $o2 ) {
1164                                 return false;
1165                         }
1166                 }
1167
1168                 // Compare most other fields
1169                 $fields = array_keys( get_class_vars( __CLASS__ ) );
1170                 $fields = array_diff( $fields, [
1171                         'defaults', // static
1172                         'lazyOptions', // static
1173                         'inCacheKey', // static
1174                         'options', // Already checked above
1175                         'onAccessCallback', // only used for ParserOutput option tracking
1176                 ] );
1177                 foreach ( $fields as $field ) {
1178                         if ( !is_object( $this->$field ) && $this->$field !== $other->$field ) {
1179                                 return false;
1180                         }
1181                 }
1182
1183                 return true;
1184         }
1185
1186         /**
1187          * Registers a callback for tracking which ParserOptions which are used.
1188          * This is a private API with the parser.
1189          * @param callable $callback
1190          */
1191         public function registerWatcher( $callback ) {
1192                 $this->onAccessCallback = $callback;
1193         }
1194
1195         /**
1196          * Called when an option is accessed.
1197          * Calls the watcher that was set using registerWatcher().
1198          * Typically, the watcher callback is ParserOutput::registerOption().
1199          * The information registered that way will be used by ParserCache::save().
1200          *
1201          * @param string $optionName Name of the option
1202          */
1203         public function optionUsed( $optionName ) {
1204                 if ( $this->onAccessCallback ) {
1205                         call_user_func( $this->onAccessCallback, $optionName );
1206                 }
1207         }
1208
1209         /**
1210          * Returns the full array of options that would have been used by
1211          * in 1.16.
1212          * Used to get the old parser cache entries when available.
1213          * @deprecated since 1.30. You probably want self::allCacheVaryingOptions() instead.
1214          * @return array
1215          */
1216         public static function legacyOptions() {
1217                 wfDeprecated( __METHOD__, '1.30' );
1218                 return [
1219                         'stubthreshold',
1220                         'numberheadings',
1221                         'userlang',
1222                         'thumbsize',
1223                         'editsection',
1224                         'printable'
1225                 ];
1226         }
1227
1228         /**
1229          * Return all option keys that vary the options hash
1230          * @since 1.30
1231          * @return string[]
1232          */
1233         public static function allCacheVaryingOptions() {
1234                 // Trigger a call to the 'ParserOptionsRegister' hook if it hasn't
1235                 // already been called.
1236                 if ( self::$defaults === null ) {
1237                         self::getDefaults();
1238                 }
1239                 return array_keys( array_filter( self::$inCacheKey ) );
1240         }
1241
1242         /**
1243          * Convert an option to a string value
1244          * @param mixed $value
1245          * @return string
1246          */
1247         private function optionToString( $value ) {
1248                 if ( $value === true ) {
1249                         return '1';
1250                 } elseif ( $value === false ) {
1251                         return '0';
1252                 } elseif ( $value === null ) {
1253                         return '';
1254                 } elseif ( $value instanceof Language ) {
1255                         return $value->getCode();
1256                 } elseif ( is_array( $value ) ) {
1257                         return '[' . join( ',', array_map( [ $this, 'optionToString' ], $value ) ) . ']';
1258                 } else {
1259                         return (string)$value;
1260                 }
1261         }
1262
1263         /**
1264          * Generate a hash string with the values set on these ParserOptions
1265          * for the keys given in the array.
1266          * This will be used as part of the hash key for the parser cache,
1267          * so users sharing the options with vary for the same page share
1268          * the same cached data safely.
1269          *
1270          * @since 1.17
1271          * @param array $forOptions
1272          * @param Title $title Used to get the content language of the page (since r97636)
1273          * @return string Page rendering hash
1274          */
1275         public function optionsHash( $forOptions, $title = null ) {
1276                 global $wgRenderHashAppend;
1277
1278                 $options = $this->options;
1279                 $defaults = self::getCanonicalOverrides() + self::getDefaults();
1280                 $inCacheKey = self::$inCacheKey;
1281
1282                 // Historical hack: 'editsection' hasn't been a true parser option since
1283                 // Feb 2015 (instead the parser outputs a constant placeholder and post-parse
1284                 // processing handles the option). But Wikibase forces it in $forOptions
1285                 // and expects the cache key to still vary on it for T85252.
1286                 // @deprecated since 1.30, Wikibase should use addExtraKey() or something instead.
1287                 if ( in_array( 'editsection', $forOptions, true ) ) {
1288                         $options['editsection'] = $this->mEditSection;
1289                         $defaults['editsection'] = true;
1290                         $inCacheKey['editsection'] = true;
1291                         ksort( $inCacheKey );
1292                 }
1293
1294                 // We only include used options with non-canonical values in the key
1295                 // so adding a new option doesn't invalidate the entire parser cache.
1296                 // The drawback to this is that changing the default value of an option
1297                 // requires manual invalidation of existing cache entries, as mentioned
1298                 // in the docs on the relevant methods and hooks.
1299                 $values = [];
1300                 foreach ( $inCacheKey as $option => $include ) {
1301                         if ( $include && in_array( $option, $forOptions, true ) ) {
1302                                 $v = $this->optionToString( $options[$option] );
1303                                 $d = $this->optionToString( $defaults[$option] );
1304                                 if ( $v !== $d ) {
1305                                         $values[] = "$option=$v";
1306                                 }
1307                         }
1308                 }
1309
1310                 $confstr = $values ? join( '!', $values ) : 'canonical';
1311
1312                 // add in language specific options, if any
1313                 // @todo FIXME: This is just a way of retrieving the url/user preferred variant
1314                 if ( !is_null( $title ) ) {
1315                         $confstr .= $title->getPageLanguage()->getExtraHashOptions();
1316                 } else {
1317                         global $wgContLang;
1318                         $confstr .= $wgContLang->getExtraHashOptions();
1319                 }
1320
1321                 $confstr .= $wgRenderHashAppend;
1322
1323                 if ( $this->mExtraKey != '' ) {
1324                         $confstr .= $this->mExtraKey;
1325                 }
1326
1327                 // Give a chance for extensions to modify the hash, if they have
1328                 // extra options or other effects on the parser cache.
1329                 Hooks::run( 'PageRenderingHash', [ &$confstr, $this->getUser(), &$forOptions ] );
1330
1331                 // Make it a valid memcached key fragment
1332                 $confstr = str_replace( ' ', '_', $confstr );
1333
1334                 return $confstr;
1335         }
1336
1337         /**
1338          * Test whether these options are safe to cache
1339          * @since 1.30
1340          * @return bool
1341          */
1342         public function isSafeToCache() {
1343                 $defaults = self::getCanonicalOverrides() + self::getDefaults();
1344                 foreach ( $this->options as $option => $value ) {
1345                         if ( empty( self::$inCacheKey[$option] ) ) {
1346                                 $v = $this->optionToString( $value );
1347                                 $d = $this->optionToString( $defaults[$option] );
1348                                 if ( $v !== $d ) {
1349                                         return false;
1350                                 }
1351                         }
1352                 }
1353                 return true;
1354         }
1355
1356         /**
1357          * Sets a hook to force that a page exists, and sets a current revision callback to return
1358          * a revision with custom content when the current revision of the page is requested.
1359          *
1360          * @since 1.25
1361          * @param Title $title
1362          * @param Content $content
1363          * @param User $user The user that the fake revision is attributed to
1364          * @return ScopedCallback to unset the hook
1365          */
1366         public function setupFakeRevision( $title, $content, $user ) {
1367                 $oldCallback = $this->setCurrentRevisionCallback(
1368                         function (
1369                                 $titleToCheck, $parser = false ) use ( $title, $content, $user, &$oldCallback
1370                         ) {
1371                                 if ( $titleToCheck->equals( $title ) ) {
1372                                         return new Revision( [
1373                                                 'page' => $title->getArticleID(),
1374                                                 'user_text' => $user->getName(),
1375                                                 'user' => $user->getId(),
1376                                                 'parent_id' => $title->getLatestRevID(),
1377                                                 'title' => $title,
1378                                                 'content' => $content
1379                                         ] );
1380                                 } else {
1381                                         return call_user_func( $oldCallback, $titleToCheck, $parser );
1382                                 }
1383                         }
1384                 );
1385
1386                 global $wgHooks;
1387                 $wgHooks['TitleExists'][] =
1388                         function ( $titleToCheck, &$exists ) use ( $title ) {
1389                                 if ( $titleToCheck->equals( $title ) ) {
1390                                         $exists = true;
1391                                 }
1392                         };
1393                 end( $wgHooks['TitleExists'] );
1394                 $key = key( $wgHooks['TitleExists'] );
1395                 LinkCache::singleton()->clearBadLink( $title->getPrefixedDBkey() );
1396                 return new ScopedCallback( function () use ( $title, $key ) {
1397                         global $wgHooks;
1398                         unset( $wgHooks['TitleExists'][$key] );
1399                         LinkCache::singleton()->clearLink( $title );
1400                 } );
1401         }
1402 }
1403
1404 /**
1405  * For really cool vim folding this needs to be at the end:
1406  * vim: foldmarker=@{,@} foldmethod=marker
1407  */