includes/parser/Parser.php

   1 <?php
   2 /**
   3  * PHP parser that converts wiki markup to HTML.
   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 MediaWiki\Linker\LinkRenderer;
  24 use MediaWiki\MediaWikiServices;
  25 use Wikimedia\ScopedCallback;
  26
  27 /**
  28  * @defgroup Parser Parser
  29  */
  30
  31 /**
  32  * PHP Parser - Processes wiki markup (which uses a more user-friendly
  33  * syntax, such as "[[link]]" for making links), and provides a one-way
  34  * transformation of that wiki markup it into (X)HTML output / markup
  35  * (which in turn the browser understands, and can display).
  36  *
  37  * There are seven main entry points into the Parser class:
  38  *
  39  * - Parser::parse()
  40  *     produces HTML output
  41  * - Parser::preSaveTransform()
  42  *     produces altered wiki markup
  43  * - Parser::preprocess()
  44  *     removes HTML comments and expands templates
  45  * - Parser::cleanSig() and Parser::cleanSigInSig()
  46  *     cleans a signature before saving it to preferences
  47  * - Parser::getSection()
  48  *     return the content of a section from an article for section editing
  49  * - Parser::replaceSection()
  50  *     replaces a section by number inside an article
  51  * - Parser::getPreloadText()
  52  *     removes <noinclude> sections and <includeonly> tags
  53  *
  54  * Globals used:
  55  *    object: $wgContLang
  56  *
  57  * @warning $wgUser or $wgTitle or $wgRequest or $wgLang. Keep them away!
  58  *
  59  * @par Settings:
  60  * $wgNamespacesWithSubpages
  61  *
  62  * @par Settings only within ParserOptions:
  63  * $wgAllowExternalImages
  64  * $wgAllowSpecialInclusion
  65  * $wgInterwikiMagic
  66  * $wgMaxArticleSize
  67  *
  68  * @ingroup Parser
  69  */
  70 class Parser {
  71         /**
  72          * Update this version number when the ParserOutput format
  73          * changes in an incompatible way, so the parser cache
  74          * can automatically discard old data.
  75          */
  76         const VERSION = '1.6.4';
  77
  78         /**
  79          * Update this version number when the output of serialiseHalfParsedText()
  80          * changes in an incompatible way
  81          */
  82         const HALF_PARSED_VERSION = 2;
  83
  84         # Flags for Parser::setFunctionHook
  85         const SFH_NO_HASH = 1;
  86         const SFH_OBJECT_ARGS = 2;
  87
  88         # Constants needed for external link processing
  89         # Everything except bracket, space, or control characters
  90         # \p{Zs} is unicode 'separator, space' category. It covers the space 0x20
  91         # as well as U+3000 is IDEOGRAPHIC SPACE for T21052
  92         const EXT_LINK_URL_CLASS = '[^][<>"\\x00-\\x20\\x7F\p{Zs}]';
  93         # Simplified expression to match an IPv4 or IPv6 address, or
  94         # at least one character of a host name (embeds EXT_LINK_URL_CLASS)
  95         const EXT_LINK_ADDR = '(?:[0-9.]+|\\[(?i:[0-9a-f:.]+)\\]|[^][<>"\\x00-\\x20\\x7F\p{Zs}])';
  96         # RegExp to make image URLs (embeds IPv6 part of EXT_LINK_ADDR)
  97         // @codingStandardsIgnoreStart Generic.Files.LineLength
  98         const EXT_IMAGE_REGEX = '/^(http:\/\/|https:\/\/)((?:\\[(?i:[0-9a-f:.]+)\\])?[^][<>"\\x00-\\x20\\x7F\p{Zs}]+)
  99                 \\/([A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]+)\\.((?i)gif|png|jpg|jpeg)$/Sxu';
 100         // @codingStandardsIgnoreEnd
 101
 102         # Regular expression for a non-newline space
 103         const SPACE_NOT_NL = '(?:\t|&nbsp;|&\#0*160;|&\#[Xx]0*[Aa]0;|\p{Zs})';
 104
 105         # Flags for preprocessToDom
 106         const PTD_FOR_INCLUSION = 1;
 107
 108         # Allowed values for $this->mOutputType
 109         # Parameter to startExternalParse().
 110         const OT_HTML = 1; # like parse()
 111         const OT_WIKI = 2; # like preSaveTransform()
 112         const OT_PREPROCESS = 3; # like preprocess()
 113         const OT_MSG = 3;
 114         const OT_PLAIN = 4; # like extractSections() - portions of the original are returned unchanged.
 115
 116         /**
 117          * @var string Prefix and suffix for temporary replacement strings
 118          * for the multipass parser.
 119          *
 120          * \x7f should never appear in input as it's disallowed in XML.
 121          * Using it at the front also gives us a little extra robustness
 122          * since it shouldn't match when butted up against identifier-like
 123          * string constructs.
 124          *
 125          * Must not consist of all title characters, or else it will change
 126          * the behavior of <nowiki> in a link.
 127          *
 128          * Must have a character that needs escaping in attributes, otherwise
 129          * someone could put a strip marker in an attribute, to get around
 130          * escaping quote marks, and break out of the attribute. Thus we add
 131          * `'".
 132          */
 133         const MARKER_SUFFIX = "-QINU`\"'\x7f";
 134         const MARKER_PREFIX = "\x7f'\"`UNIQ-";
 135
 136         # Markers used for wrapping the table of contents
 137         const TOC_START = '<mw:toc>';
 138         const TOC_END = '</mw:toc>';
 139
 140         # Persistent:
 141         public $mTagHooks = [];
 142         public $mTransparentTagHooks = [];
 143         public $mFunctionHooks = [];
 144         public $mFunctionSynonyms = [ 0 => [], 1 => [] ];
 145         public $mFunctionTagHooks = [];
 146         public $mStripList = [];
 147         public $mDefaultStripList = [];
 148         public $mVarCache = [];
 149         public $mImageParams = [];
 150         public $mImageParamsMagicArray = [];
 151         public $mMarkerIndex = 0;
 152         public $mFirstCall = true;
 153
 154         # Initialised by initialiseVariables()
 155
 156         /**
 157          * @var MagicWordArray
 158          */
 159         public $mVariables;
 160
 161         /**
 162          * @var MagicWordArray
 163          */
 164         public $mSubstWords;
 165         # Initialised in constructor
 166         public $mConf, $mExtLinkBracketedRegex, $mUrlProtocols;
 167
 168         # Initialized in getPreprocessor()
 169         /** @var Preprocessor */
 170         public $mPreprocessor;
 171
 172         # Cleared with clearState():
 173         /**
 174          * @var ParserOutput
 175          */
 176         public $mOutput;
 177         public $mAutonumber;
 178
 179         /**
 180          * @var StripState
 181          */
 182         public $mStripState;
 183
 184         public $mIncludeCount;
 185         /**
 186          * @var LinkHolderArray
 187          */
 188         public $mLinkHolders;
 189
 190         public $mLinkID;
 191         public $mIncludeSizes, $mPPNodeCount, $mGeneratedPPNodeCount, $mHighestExpansionDepth;
 192         public $mDefaultSort;
 193         public $mTplRedirCache, $mTplDomCache, $mHeadings, $mDoubleUnderscores;
 194         public $mExpensiveFunctionCount; # number of expensive parser function calls
 195         public $mShowToc, $mForceTocPosition;
 196
 197         /**
 198          * @var User
 199          */
 200         public $mUser; # User object; only used when doing pre-save transform
 201
 202         # Temporary
 203         # These are variables reset at least once per parse regardless of $clearState
 204
 205         /**
 206          * @var ParserOptions
 207          */
 208         public $mOptions;
 209
 210         /**
 211          * @var Title
 212          */
 213         public $mTitle;        # Title context, used for self-link rendering and similar things
 214         public $mOutputType;   # Output type, one of the OT_xxx constants
 215         public $ot;            # Shortcut alias, see setOutputType()
 216         public $mRevisionObject; # The revision object of the specified revision ID
 217         public $mRevisionId;   # ID to display in {{REVISIONID}} tags
 218         public $mRevisionTimestamp; # The timestamp of the specified revision ID
 219         public $mRevisionUser; # User to display in {{REVISIONUSER}} tag
 220         public $mRevisionSize; # Size to display in {{REVISIONSIZE}} variable
 221         public $mRevIdForTs;   # The revision ID which was used to fetch the timestamp
 222         public $mInputSize = false; # For {{PAGESIZE}} on current page.
 223
 224         /**
 225          * @var string Deprecated accessor for the strip marker prefix.
 226          * @deprecated since 1.26; use Parser::MARKER_PREFIX instead.
 227          */
 228         public $mUniqPrefix = Parser::MARKER_PREFIX;
 229
 230         /**
 231          * @var array Array with the language name of each language link (i.e. the
 232          * interwiki prefix) in the key, value arbitrary. Used to avoid sending
 233          * duplicate language links to the ParserOutput.
 234          */
 235         public $mLangLinkLanguages;
 236
 237         /**
 238          * @var MapCacheLRU|null
 239          * @since 1.24
 240          *
 241          * A cache of the current revisions of titles. Keys are $title->getPrefixedDbKey()
 242          */
 243         public $currentRevisionCache;
 244
 245         /**
 246          * @var bool Recursive call protection.
 247          * This variable should be treated as if it were private.
 248          */
 249         public $mInParse = false;
 250
 251         /** @var SectionProfiler */
 252         protected $mProfiler;
 253
 254         /**
 255          * @var LinkRenderer
 256          */
 257         protected $mLinkRenderer;
 258
 259         /**
 260          * @param array $conf
 261          */
 262         public function __construct( $conf = [] ) {
 263                 $this->mConf = $conf;
 264                 $this->mUrlProtocols = wfUrlProtocols();
 265                 $this->mExtLinkBracketedRegex = '/\[(((?i)' . $this->mUrlProtocols . ')' .
 266                         self::EXT_LINK_ADDR .
 267                         self::EXT_LINK_URL_CLASS . '*)\p{Zs}*([^\]\\x00-\\x08\\x0a-\\x1F]*?)\]/Su';
 268                 if ( isset( $conf['preprocessorClass'] ) ) {
 269                         $this->mPreprocessorClass = $conf['preprocessorClass'];
 270                 } elseif ( defined( 'HPHP_VERSION' ) ) {
 271                         # Preprocessor_Hash is much faster than Preprocessor_DOM under HipHop
 272                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 273                 } elseif ( extension_loaded( 'domxml' ) ) {
 274                         # PECL extension that conflicts with the core DOM extension (T15770)
 275                         wfDebug( "Warning: you have the obsolete domxml extension for PHP. Please remove it!\n" );
 276                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 277                 } elseif ( extension_loaded( 'dom' ) ) {
 278                         $this->mPreprocessorClass = 'Preprocessor_DOM';
 279                 } else {
 280                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 281                 }
 282                 wfDebug( __CLASS__ . ": using preprocessor: {$this->mPreprocessorClass}\n" );
 283         }
 284
 285         /**
 286          * Reduce memory usage to reduce the impact of circular references
 287          */
 288         public function __destruct() {
 289                 if ( isset( $this->mLinkHolders ) ) {
 290                         unset( $this->mLinkHolders );
 291                 }
 292                 foreach ( $this as $name => $value ) {
 293                         unset( $this->$name );
 294                 }
 295         }
 296
 297         /**
 298          * Allow extensions to clean up when the parser is cloned
 299          */
 300         public function __clone() {
 301                 $this->mInParse = false;
 302
 303                 // T58226: When you create a reference "to" an object field, that
 304                 // makes the object field itself be a reference too (until the other
 305                 // reference goes out of scope). When cloning, any field that's a
 306                 // reference is copied as a reference in the new object. Both of these
 307                 // are defined PHP5 behaviors, as inconvenient as it is for us when old
 308                 // hooks from PHP4 days are passing fields by reference.
 309                 foreach ( [ 'mStripState', 'mVarCache' ] as $k ) {
 310                         // Make a non-reference copy of the field, then rebind the field to
 311                         // reference the new copy.
 312                         $tmp = $this->$k;
 313                         $this->$k =& $tmp;
 314                         unset( $tmp );
 315                 }
 316
 317                 Hooks::run( 'ParserCloned', [ $this ] );
 318         }
 319
 320         /**
 321          * Do various kinds of initialisation on the first call of the parser
 322          */
 323         public function firstCallInit() {
 324                 if ( !$this->mFirstCall ) {
 325                         return;
 326                 }
 327                 $this->mFirstCall = false;
 328
 329                 CoreParserFunctions::register( $this );
 330                 CoreTagHooks::register( $this );
 331                 $this->initialiseVariables();
 332
 333                 // Avoid PHP 7.1 warning from passing $this by reference
 334                 $parser = $this;
 335                 Hooks::run( 'ParserFirstCallInit', [ &$parser ] );
 336         }
 337
 338         /**
 339          * Clear Parser state
 340          *
 341          * @private
 342          */
 343         public function clearState() {
 344                 if ( $this->mFirstCall ) {
 345                         $this->firstCallInit();
 346                 }
 347                 $this->mOutput = new ParserOutput;
 348                 $this->mOptions->registerWatcher( [ $this->mOutput, 'recordOption' ] );
 349                 $this->mAutonumber = 0;
 350                 $this->mIncludeCount = [];
 351                 $this->mLinkHolders = new LinkHolderArray( $this );
 352                 $this->mLinkID = 0;
 353                 $this->mRevisionObject = $this->mRevisionTimestamp =
 354                         $this->mRevisionId = $this->mRevisionUser = $this->mRevisionSize = null;
 355                 $this->mVarCache = [];
 356                 $this->mUser = null;
 357                 $this->mLangLinkLanguages = [];
 358                 $this->currentRevisionCache = null;
 359
 360                 $this->mStripState = new StripState;
 361
 362                 # Clear these on every parse, T6549
 363                 $this->mTplRedirCache = $this->mTplDomCache = [];
 364
 365                 $this->mShowToc = true;
 366                 $this->mForceTocPosition = false;
 367                 $this->mIncludeSizes = [
 368                         'post-expand' => 0,
 369                         'arg' => 0,
 370                 ];
 371                 $this->mPPNodeCount = 0;
 372                 $this->mGeneratedPPNodeCount = 0;
 373                 $this->mHighestExpansionDepth = 0;
 374                 $this->mDefaultSort = false;
 375                 $this->mHeadings = [];
 376                 $this->mDoubleUnderscores = [];
 377                 $this->mExpensiveFunctionCount = 0;
 378
 379                 # Fix cloning
 380                 if ( isset( $this->mPreprocessor ) && $this->mPreprocessor->parser !== $this ) {
 381                         $this->mPreprocessor = null;
 382                 }
 383
 384                 $this->mProfiler = new SectionProfiler();
 385
 386                 // Avoid PHP 7.1 warning from passing $this by reference
 387                 $parser = $this;
 388                 Hooks::run( 'ParserClearState', [ &$parser ] );
 389         }
 390
 391         /**
 392          * Convert wikitext to HTML
 393          * Do not call this function recursively.
 394          *
 395          * @param string $text Text we want to parse
 396          * @param Title $title
 397          * @param ParserOptions $options
 398          * @param bool $linestart
 399          * @param bool $clearState
 400          * @param int $revid Number to pass in {{REVISIONID}}
 401          * @return ParserOutput A ParserOutput
 402          */
 403         public function parse(
 404                 $text, Title $title, ParserOptions $options,
 405                 $linestart = true, $clearState = true, $revid = null
 406         ) {
 407                 /**
 408                  * First pass--just handle <nowiki> sections, pass the rest off
 409                  * to internalParse() which does all the real work.
 410                  */
 411
 412                 global $wgShowHostnames;
 413
 414                 if ( $clearState ) {
 415                         // We use U+007F DELETE to construct strip markers, so we have to make
 416                         // sure that this character does not occur in the input text.
 417                         $text = strtr( $text, "\x7f", "?" );
 418                         $magicScopeVariable = $this->lock();
 419                 }
 420
 421                 $this->startParse( $title, $options, self::OT_HTML, $clearState );
 422
 423                 $this->currentRevisionCache = null;
 424                 $this->mInputSize = strlen( $text );
 425                 if ( $this->mOptions->getEnableLimitReport() ) {
 426                         $this->mOutput->resetParseStartTime();
 427                 }
 428
 429                 $oldRevisionId = $this->mRevisionId;
 430                 $oldRevisionObject = $this->mRevisionObject;
 431                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 432                 $oldRevisionUser = $this->mRevisionUser;
 433                 $oldRevisionSize = $this->mRevisionSize;
 434                 if ( $revid !== null ) {
 435                         $this->mRevisionId = $revid;
 436                         $this->mRevisionObject = null;
 437                         $this->mRevisionTimestamp = null;
 438                         $this->mRevisionUser = null;
 439                         $this->mRevisionSize = null;
 440                 }
 441
 442                 // Avoid PHP 7.1 warning from passing $this by reference
 443                 $parser = $this;
 444                 Hooks::run( 'ParserBeforeStrip', [ &$parser, &$text, &$this->mStripState ] );
 445                 # No more strip!
 446                 Hooks::run( 'ParserAfterStrip', [ &$parser, &$text, &$this->mStripState ] );
 447                 $text = $this->internalParse( $text );
 448                 Hooks::run( 'ParserAfterParse', [ &$parser, &$text, &$this->mStripState ] );
 449
 450                 $text = $this->internalParseHalfParsed( $text, true, $linestart );
 451
 452                 /**
 453                  * A converted title will be provided in the output object if title and
 454                  * content conversion are enabled, the article text does not contain
 455                  * a conversion-suppressing double-underscore tag, and no
 456                  * {{DISPLAYTITLE:...}} is present. DISPLAYTITLE takes precedence over
 457                  * automatic link conversion.
 458                  */
 459                 if ( !( $options->getDisableTitleConversion()
 460                         || isset( $this->mDoubleUnderscores['nocontentconvert'] )
 461                         || isset( $this->mDoubleUnderscores['notitleconvert'] )
 462                         || $this->mOutput->getDisplayTitle() !== false )
 463                 ) {
 464                         $convruletitle = $this->getConverterLanguage()->getConvRuleTitle();
 465                         if ( $convruletitle ) {
 466                                 $this->mOutput->setTitleText( $convruletitle );
 467                         } else {
 468                                 $titleText = $this->getConverterLanguage()->convertTitle( $title );
 469                                 $this->mOutput->setTitleText( $titleText );
 470                         }
 471                 }
 472
 473                 # Done parsing! Compute runtime adaptive expiry if set
 474                 $this->mOutput->finalizeAdaptiveCacheExpiry();
 475
 476                 # Warn if too many heavyweight parser functions were used
 477                 if ( $this->mExpensiveFunctionCount > $this->mOptions->getExpensiveParserFunctionLimit() ) {
 478                         $this->limitationWarn( 'expensive-parserfunction',
 479                                 $this->mExpensiveFunctionCount,
 480                                 $this->mOptions->getExpensiveParserFunctionLimit()
 481                         );
 482                 }
 483
 484                 # Information on include size limits, for the benefit of users who try to skirt them
 485                 if ( $this->mOptions->getEnableLimitReport() ) {
 486                         $max = $this->mOptions->getMaxIncludeSize();
 487
 488                         $cpuTime = $this->mOutput->getTimeSinceStart( 'cpu' );
 489                         if ( $cpuTime !== null ) {
 490                                 $this->mOutput->setLimitReportData( 'limitreport-cputime',
 491                                         sprintf( "%.3f", $cpuTime )
 492                                 );
 493                         }
 494
 495                         $wallTime = $this->mOutput->getTimeSinceStart( 'wall' );
 496                         $this->mOutput->setLimitReportData( 'limitreport-walltime',
 497                                 sprintf( "%.3f", $wallTime )
 498                         );
 499
 500                         $this->mOutput->setLimitReportData( 'limitreport-ppvisitednodes',
 501                                 [ $this->mPPNodeCount, $this->mOptions->getMaxPPNodeCount() ]
 502                         );
 503                         $this->mOutput->setLimitReportData( 'limitreport-ppgeneratednodes',
 504                                 [ $this->mGeneratedPPNodeCount, $this->mOptions->getMaxGeneratedPPNodeCount() ]
 505                         );
 506                         $this->mOutput->setLimitReportData( 'limitreport-postexpandincludesize',
 507                                 [ $this->mIncludeSizes['post-expand'], $max ]
 508                         );
 509                         $this->mOutput->setLimitReportData( 'limitreport-templateargumentsize',
 510                                 [ $this->mIncludeSizes['arg'], $max ]
 511                         );
 512                         $this->mOutput->setLimitReportData( 'limitreport-expansiondepth',
 513                                 [ $this->mHighestExpansionDepth, $this->mOptions->getMaxPPExpandDepth() ]
 514                         );
 515                         $this->mOutput->setLimitReportData( 'limitreport-expensivefunctioncount',
 516                                 [ $this->mExpensiveFunctionCount, $this->mOptions->getExpensiveParserFunctionLimit() ]
 517                         );
 518                         Hooks::run( 'ParserLimitReportPrepare', [ $this, $this->mOutput ] );
 519
 520                         $limitReport = "NewPP limit report\n";
 521                         if ( $wgShowHostnames ) {
 522                                 $limitReport .= 'Parsed by ' . wfHostname() . "\n";
 523                         }
 524                         $limitReport .= 'Cached time: ' . $this->mOutput->getCacheTime() . "\n";
 525                         $limitReport .= 'Cache expiry: ' . $this->mOutput->getCacheExpiry() . "\n";
 526                         $limitReport .= 'Dynamic content: ' .
 527                                 ( $this->mOutput->hasDynamicContent() ? 'true' : 'false' ) .
 528                                 "\n";
 529
 530                         foreach ( $this->mOutput->getLimitReportData() as $key => $value ) {
 531                                 if ( Hooks::run( 'ParserLimitReportFormat',
 532                                         [ $key, &$value, &$limitReport, false, false ]
 533                                 ) ) {
 534                                         $keyMsg = wfMessage( $key )->inLanguage( 'en' )->useDatabase( false );
 535                                         $valueMsg = wfMessage( [ "$key-value-text", "$key-value" ] )
 536                                                 ->inLanguage( 'en' )->useDatabase( false );
 537                                         if ( !$valueMsg->exists() ) {
 538                                                 $valueMsg = new RawMessage( '$1' );
 539                                         }
 540                                         if ( !$keyMsg->isDisabled() && !$valueMsg->isDisabled() ) {
 541                                                 $valueMsg->params( $value );
 542                                                 $limitReport .= "{$keyMsg->text()}: {$valueMsg->text()}\n";
 543                                         }
 544                                 }
 545                         }
 546                         // Since we're not really outputting HTML, decode the entities and
 547                         // then re-encode the things that need hiding inside HTML comments.
 548                         $limitReport = htmlspecialchars_decode( $limitReport );
 549                         Hooks::run( 'ParserLimitReport', [ $this, &$limitReport ] );
 550
 551                         // Sanitize for comment. Note '‐' in the replacement is U+2010,
 552                         // which looks much like the problematic '-'.
 553                         $limitReport = str_replace( [ '-', '&' ], [ '‐', '&amp;' ], $limitReport );
 554                         $text .= "\n<!-- \n$limitReport-->\n";
 555
 556                         // Add on template profiling data in human/machine readable way
 557                         $dataByFunc = $this->mProfiler->getFunctionStats();
 558                         uasort( $dataByFunc, function ( $a, $b ) {
 559                                 return $a['real'] < $b['real']; // descending order
 560                         } );
 561                         $profileReport = [];
 562                         foreach ( array_slice( $dataByFunc, 0, 10 ) as $item ) {
 563                                 $profileReport[] = sprintf( "%6.2f%% %8.3f %6d %s",
 564                                         $item['%real'], $item['real'], $item['calls'],
 565                                         htmlspecialchars( $item['name'] ) );
 566                         }
 567                         $text .= "<!--\nTransclusion expansion time report (%,ms,calls,template)\n";
 568                         $text .= implode( "\n", $profileReport ) . "\n-->\n";
 569
 570                         $this->mOutput->setLimitReportData( 'limitreport-timingprofile', $profileReport );
 571
 572                         // Add other cache related metadata
 573                         if ( $wgShowHostnames ) {
 574                                 $this->mOutput->setLimitReportData( 'cachereport-origin', wfHostname() );
 575                         }
 576                         $this->mOutput->setLimitReportData( 'cachereport-timestamp',
 577                                 $this->mOutput->getCacheTime() );
 578                         $this->mOutput->setLimitReportData( 'cachereport-ttl',
 579                                 $this->mOutput->getCacheExpiry() );
 580                         $this->mOutput->setLimitReportData( 'cachereport-transientcontent',
 581                                 $this->mOutput->hasDynamicContent() );
 582
 583                         if ( $this->mGeneratedPPNodeCount > $this->mOptions->getMaxGeneratedPPNodeCount() / 10 ) {
 584                                 wfDebugLog( 'generated-pp-node-count', $this->mGeneratedPPNodeCount . ' ' .
 585                                         $this->mTitle->getPrefixedDBkey() );
 586                         }
 587                 }
 588                 $this->mOutput->setText( $text );
 589
 590                 $this->mRevisionId = $oldRevisionId;
 591                 $this->mRevisionObject = $oldRevisionObject;
 592                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 593                 $this->mRevisionUser = $oldRevisionUser;
 594                 $this->mRevisionSize = $oldRevisionSize;
 595                 $this->mInputSize = false;
 596                 $this->currentRevisionCache = null;
 597
 598                 return $this->mOutput;
 599         }
 600
 601         /**
 602          * Half-parse wikitext to half-parsed HTML. This recursive parser entry point
 603          * can be called from an extension tag hook.
 604          *
 605          * The output of this function IS NOT SAFE PARSED HTML; it is "half-parsed"
 606          * instead, which means that lists and links have not been fully parsed yet,
 607          * and strip markers are still present.
 608          *
 609          * Use recursiveTagParseFully() to fully parse wikitext to output-safe HTML.
 610          *
 611          * Use this function if you're a parser tag hook and you want to parse
 612          * wikitext before or after applying additional transformations, and you
 613          * intend to *return the result as hook output*, which will cause it to go
 614          * through the rest of parsing process automatically.
 615          *
 616          * If $frame is not provided, then template variables (e.g., {{{1}}}) within
 617          * $text are not expanded
 618          *
 619          * @param string $text Text extension wants to have parsed
 620          * @param bool|PPFrame $frame The frame to use for expanding any template variables
 621          * @return string UNSAFE half-parsed HTML
 622          */
 623         public function recursiveTagParse( $text, $frame = false ) {
 624                 // Avoid PHP 7.1 warning from passing $this by reference
 625                 $parser = $this;
 626                 Hooks::run( 'ParserBeforeStrip', [ &$parser, &$text, &$this->mStripState ] );
 627                 Hooks::run( 'ParserAfterStrip', [ &$parser, &$text, &$this->mStripState ] );
 628                 $text = $this->internalParse( $text, false, $frame );
 629                 return $text;
 630         }
 631
 632         /**
 633          * Fully parse wikitext to fully parsed HTML. This recursive parser entry
 634          * point can be called from an extension tag hook.
 635          *
 636          * The output of this function is fully-parsed HTML that is safe for output.
 637          * If you're a parser tag hook, you might want to use recursiveTagParse()
 638          * instead.
 639          *
 640          * If $frame is not provided, then template variables (e.g., {{{1}}}) within
 641          * $text are not expanded
 642          *
 643          * @since 1.25
 644          *
 645          * @param string $text Text extension wants to have parsed
 646          * @param bool|PPFrame $frame The frame to use for expanding any template variables
 647          * @return string Fully parsed HTML
 648          */
 649         public function recursiveTagParseFully( $text, $frame = false ) {
 650                 $text = $this->recursiveTagParse( $text, $frame );
 651                 $text = $this->internalParseHalfParsed( $text, false );
 652                 return $text;
 653         }
 654
 655         /**
 656          * Expand templates and variables in the text, producing valid, static wikitext.
 657          * Also removes comments.
 658          * Do not call this function recursively.
 659          * @param string $text
 660          * @param Title $title
 661          * @param ParserOptions $options
 662          * @param int|null $revid
 663          * @param bool|PPFrame $frame
 664          * @return mixed|string
 665          */
 666         public function preprocess( $text, Title $title = null,
 667                 ParserOptions $options, $revid = null, $frame = false
 668         ) {
 669                 $magicScopeVariable = $this->lock();
 670                 $this->startParse( $title, $options, self::OT_PREPROCESS, true );
 671                 if ( $revid !== null ) {
 672                         $this->mRevisionId = $revid;
 673                 }
 674                 // Avoid PHP 7.1 warning from passing $this by reference
 675                 $parser = $this;
 676                 Hooks::run( 'ParserBeforeStrip', [ &$parser, &$text, &$this->mStripState ] );
 677                 Hooks::run( 'ParserAfterStrip', [ &$parser, &$text, &$this->mStripState ] );
 678                 $text = $this->replaceVariables( $text, $frame );
 679                 $text = $this->mStripState->unstripBoth( $text );
 680                 return $text;
 681         }
 682
 683         /**
 684          * Recursive parser entry point that can be called from an extension tag
 685          * hook.
 686          *
 687          * @param string $text Text to be expanded
 688          * @param bool|PPFrame $frame The frame to use for expanding any template variables
 689          * @return string
 690          * @since 1.19
 691          */
 692         public function recursivePreprocess( $text, $frame = false ) {
 693                 $text = $this->replaceVariables( $text, $frame );
 694                 $text = $this->mStripState->unstripBoth( $text );
 695                 return $text;
 696         }
 697
 698         /**
 699          * Process the wikitext for the "?preload=" feature. (T7210)
 700          *
 701          * "<noinclude>", "<includeonly>" etc. are parsed as for template
 702          * transclusion, comments, templates, arguments, tags hooks and parser
 703          * functions are untouched.
 704          *
 705          * @param string $text
 706          * @param Title $title
 707          * @param ParserOptions $options
 708          * @param array $params
 709          * @return string
 710          */
 711         public function getPreloadText( $text, Title $title, ParserOptions $options, $params = [] ) {
 712                 $msg = new RawMessage( $text );
 713                 $text = $msg->params( $params )->plain();
 714
 715                 # Parser (re)initialisation
 716                 $magicScopeVariable = $this->lock();
 717                 $this->startParse( $title, $options, self::OT_PLAIN, true );
 718
 719                 $flags = PPFrame::NO_ARGS | PPFrame::NO_TEMPLATES;
 720                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
 721                 $text = $this->getPreprocessor()->newFrame()->expand( $dom, $flags );
 722                 $text = $this->mStripState->unstripBoth( $text );
 723                 return $text;
 724         }
 725
 726         /**
 727          * Get a random string
 728          *
 729          * @return string
 730          * @deprecated since 1.26; use wfRandomString() instead.
 731          */
 732         public static function getRandomString() {
 733                 wfDeprecated( __METHOD__, '1.26' );
 734                 return wfRandomString( 16 );
 735         }
 736
 737         /**
 738          * Set the current user.
 739          * Should only be used when doing pre-save transform.
 740          *
 741          * @param User|null $user User object or null (to reset)
 742          */
 743         public function setUser( $user ) {
 744                 $this->mUser = $user;
 745         }
 746
 747         /**
 748          * Accessor for mUniqPrefix.
 749          *
 750          * @return string
 751          * @deprecated since 1.26; use Parser::MARKER_PREFIX instead.
 752          */
 753         public function uniqPrefix() {
 754                 wfDeprecated( __METHOD__, '1.26' );
 755                 return self::MARKER_PREFIX;
 756         }
 757
 758         /**
 759          * Set the context title
 760          *
 761          * @param Title $t
 762          */
 763         public function setTitle( $t ) {
 764                 if ( !$t ) {
 765                         $t = Title::newFromText( 'NO TITLE' );
 766                 }
 767
 768                 if ( $t->hasFragment() ) {
 769                         # Strip the fragment to avoid various odd effects
 770                         $this->mTitle = $t->createFragmentTarget( '' );
 771                 } else {
 772                         $this->mTitle = $t;
 773                 }
 774         }
 775
 776         /**
 777          * Accessor for the Title object
 778          *
 779          * @return Title
 780          */
 781         public function getTitle() {
 782                 return $this->mTitle;
 783         }
 784
 785         /**
 786          * Accessor/mutator for the Title object
 787          *
 788          * @param Title $x Title object or null to just get the current one
 789          * @return Title
 790          */
 791         public function Title( $x = null ) {
 792                 return wfSetVar( $this->mTitle, $x );
 793         }
 794
 795         /**
 796          * Set the output type
 797          *
 798          * @param int $ot New value
 799          */
 800         public function setOutputType( $ot ) {
 801                 $this->mOutputType = $ot;
 802                 # Shortcut alias
 803                 $this->ot = [
 804                         'html' => $ot == self::OT_HTML,
 805                         'wiki' => $ot == self::OT_WIKI,
 806                         'pre' => $ot == self::OT_PREPROCESS,
 807                         'plain' => $ot == self::OT_PLAIN,
 808                 ];
 809         }
 810
 811         /**
 812          * Accessor/mutator for the output type
 813          *
 814          * @param int|null $x New value or null to just get the current one
 815          * @return int
 816          */
 817         public function OutputType( $x = null ) {
 818                 return wfSetVar( $this->mOutputType, $x );
 819         }
 820
 821         /**
 822          * Get the ParserOutput object
 823          *
 824          * @return ParserOutput
 825          */
 826         public function getOutput() {
 827                 return $this->mOutput;
 828         }
 829
 830         /**
 831          * Get the ParserOptions object
 832          *
 833          * @return ParserOptions
 834          */
 835         public function getOptions() {
 836                 return $this->mOptions;
 837         }
 838
 839         /**
 840          * Accessor/mutator for the ParserOptions object
 841          *
 842          * @param ParserOptions $x New value or null to just get the current one
 843          * @return ParserOptions Current ParserOptions object
 844          */
 845         public function Options( $x = null ) {
 846                 return wfSetVar( $this->mOptions, $x );
 847         }
 848
 849         /**
 850          * @return int
 851          */
 852         public function nextLinkID() {
 853                 return $this->mLinkID++;
 854         }
 855
 856         /**
 857          * @param int $id
 858          */
 859         public function setLinkID( $id ) {
 860                 $this->mLinkID = $id;
 861         }
 862
 863         /**
 864          * Get a language object for use in parser functions such as {{FORMATNUM:}}
 865          * @return Language
 866          */
 867         public function getFunctionLang() {
 868                 return $this->getTargetLanguage();
 869         }
 870
 871         /**
 872          * Get the target language for the content being parsed. This is usually the
 873          * language that the content is in.
 874          *
 875          * @since 1.19
 876          *
 877          * @throws MWException
 878          * @return Language
 879          */
 880         public function getTargetLanguage() {
 881                 $target = $this->mOptions->getTargetLanguage();
 882
 883                 if ( $target !== null ) {
 884                         return $target;
 885                 } elseif ( $this->mOptions->getInterfaceMessage() ) {
 886                         return $this->mOptions->getUserLangObj();
 887                 } elseif ( is_null( $this->mTitle ) ) {
 888                         throw new MWException( __METHOD__ . ': $this->mTitle is null' );
 889                 }
 890
 891                 return $this->mTitle->getPageLanguage();
 892         }
 893
 894         /**
 895          * Get the language object for language conversion
 896          * @return Language|null
 897          */
 898         public function getConverterLanguage() {
 899                 return $this->getTargetLanguage();
 900         }
 901
 902         /**
 903          * Get a User object either from $this->mUser, if set, or from the
 904          * ParserOptions object otherwise
 905          *
 906          * @return User
 907          */
 908         public function getUser() {
 909                 if ( !is_null( $this->mUser ) ) {
 910                         return $this->mUser;
 911                 }
 912                 return $this->mOptions->getUser();
 913         }
 914
 915         /**
 916          * Get a preprocessor object
 917          *
 918          * @return Preprocessor
 919          */
 920         public function getPreprocessor() {
 921                 if ( !isset( $this->mPreprocessor ) ) {
 922                         $class = $this->mPreprocessorClass;
 923                         $this->mPreprocessor = new $class( $this );
 924                 }
 925                 return $this->mPreprocessor;
 926         }
 927
 928         /**
 929          * Get a LinkRenderer instance to make links with
 930          *
 931          * @since 1.28
 932          * @return LinkRenderer
 933          */
 934         public function getLinkRenderer() {
 935                 if ( !$this->mLinkRenderer ) {
 936                         $this->mLinkRenderer = MediaWikiServices::getInstance()
 937                                 ->getLinkRendererFactory()->create();
 938                         $this->mLinkRenderer->setStubThreshold(
 939                                 $this->getOptions()->getStubThreshold()
 940                         );
 941                 }
 942
 943                 return $this->mLinkRenderer;
 944         }
 945
 946         /**
 947          * Replaces all occurrences of HTML-style comments and the given tags
 948          * in the text with a random marker and returns the next text. The output
 949          * parameter $matches will be an associative array filled with data in
 950          * the form:
 951          *
 952          * @code
 953          *   'UNIQ-xxxxx' => [
 954          *     'element',
 955          *     'tag content',
 956          *     [ 'param' => 'x' ],
 957          *     '<element param="x">tag content</element>' ]
 958          * @endcode
 959          *
 960          * @param array $elements List of element names. Comments are always extracted.
 961          * @param string $text Source text string.
 962          * @param array $matches Out parameter, Array: extracted tags
 963          * @param string|null $uniq_prefix
 964          * @return string Stripped text
 965          * @since 1.26 The uniq_prefix argument is deprecated.
 966          */
 967         public static function extractTagsAndParams( $elements, $text, &$matches, $uniq_prefix = null ) {
 968                 if ( $uniq_prefix !== null ) {
 969                         wfDeprecated( __METHOD__ . ' called with $prefix argument', '1.26' );
 970                 }
 971                 static $n = 1;
 972                 $stripped = '';
 973                 $matches = [];
 974
 975                 $taglist = implode( '|', $elements );
 976                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?" . ">)|<(!--)/i";
 977
 978                 while ( $text != '' ) {
 979                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 980                         $stripped .= $p[0];
 981                         if ( count( $p ) < 5 ) {
 982                                 break;
 983                         }
 984                         if ( count( $p ) > 5 ) {
 985                                 # comment
 986                                 $element = $p[4];
 987                                 $attributes = '';
 988                                 $close = '';
 989                                 $inside = $p[5];
 990                         } else {
 991                                 # tag
 992                                 $element = $p[1];
 993                                 $attributes = $p[2];
 994                                 $close = $p[3];
 995                                 $inside = $p[4];
 996                         }
 997
 998                         $marker = self::MARKER_PREFIX . "-$element-" . sprintf( '%08X', $n++ ) . self::MARKER_SUFFIX;
 999                         $stripped .= $marker;
1000
1001                         if ( $close === '/>' ) {
1002                                 # Empty element tag, <tag />
1003                                 $content = null;
1004                                 $text = $inside;
1005                                 $tail = null;
1006                         } else {
1007                                 if ( $element === '!--' ) {
1008                                         $end = '/(-->)/';
1009                                 } else {
1010                                         $end = "/(<\\/$element\\s*>)/i";
1011                                 }
1012                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
1013                                 $content = $q[0];
1014                                 if ( count( $q ) < 3 ) {
1015                                         # No end tag -- let it run out to the end of the text.
1016                                         $tail = '';
1017                                         $text = '';
1018                                 } else {
1019                                         $tail = $q[1];
1020                                         $text = $q[2];
1021                                 }
1022                         }
1023
1024                         $matches[$marker] = [ $element,
1025                                 $content,
1026                                 Sanitizer::decodeTagAttributes( $attributes ),
1027                                 "<$element$attributes$close$content$tail" ];
1028                 }
1029                 return $stripped;
1030         }
1031
1032         /**
1033          * Get a list of strippable XML-like elements
1034          *
1035          * @return array
1036          */
1037         public function getStripList() {
1038                 return $this->mStripList;
1039         }
1040
1041         /**
1042          * Add an item to the strip state
1043          * Returns the unique tag which must be inserted into the stripped text
1044          * The tag will be replaced with the original text in unstrip()
1045          *
1046          * @param string $text
1047          *
1048          * @return string
1049          */
1050         public function insertStripItem( $text ) {
1051                 $marker = self::MARKER_PREFIX . "-item-{$this->mMarkerIndex}-" . self::MARKER_SUFFIX;
1052                 $this->mMarkerIndex++;
1053                 $this->mStripState->addGeneral( $marker, $text );
1054                 return $marker;
1055         }
1056
1057         /**
1058          * parse the wiki syntax used to render tables
1059          *
1060          * @private
1061          * @param string $text
1062          * @return string
1063          */
1064         public function doTableStuff( $text ) {
1065
1066                 $lines = StringUtils::explode( "\n", $text );
1067                 $out = '';
1068                 $td_history = []; # Is currently a td tag open?
1069                 $last_tag_history = []; # Save history of last lag activated (td, th or caption)
1070                 $tr_history = []; # Is currently a tr tag open?
1071                 $tr_attributes = []; # history of tr attributes
1072                 $has_opened_tr = []; # Did this table open a <tr> element?
1073                 $indent_level = 0; # indent level of the table
1074
1075                 foreach ( $lines as $outLine ) {
1076                         $line = trim( $outLine );
1077
1078                         if ( $line === '' ) { # empty line, go to next line
1079                                 $out .= $outLine . "\n";
1080                                 continue;
1081                         }
1082
1083                         $first_character = $line[0];
1084                         $first_two = substr( $line, 0, 2 );
1085                         $matches = [];
1086
1087                         if ( preg_match( '/^(:*)\s*\{\|(.*)$/', $line, $matches ) ) {
1088                                 # First check if we are starting a new table
1089                                 $indent_level = strlen( $matches[1] );
1090
1091                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
1092                                 $attributes = Sanitizer::fixTagAttributes( $attributes, 'table' );
1093
1094                                 $outLine = str_repeat( '<dl><dd>', $indent_level ) . "<table{$attributes}>";
1095                                 array_push( $td_history, false );
1096                                 array_push( $last_tag_history, '' );
1097                                 array_push( $tr_history, false );
1098                                 array_push( $tr_attributes, '' );
1099                                 array_push( $has_opened_tr, false );
1100                         } elseif ( count( $td_history ) == 0 ) {
1101                                 # Don't do any of the following
1102                                 $out .= $outLine . "\n";
1103                                 continue;
1104                         } elseif ( $first_two === '|}' ) {
1105                                 # We are ending a table
1106                                 $line = '</table>' . substr( $line, 2 );
1107                                 $last_tag = array_pop( $last_tag_history );
1108
1109                                 if ( !array_pop( $has_opened_tr ) ) {
1110                                         $line = "<tr><td></td></tr>{$line}";
1111                                 }
1112
1113                                 if ( array_pop( $tr_history ) ) {
1114                                         $line = "</tr>{$line}";
1115                                 }
1116
1117                                 if ( array_pop( $td_history ) ) {
1118                                         $line = "</{$last_tag}>{$line}";
1119                                 }
1120                                 array_pop( $tr_attributes );
1121                                 $outLine = $line . str_repeat( '</dd></dl>', $indent_level );
1122                         } elseif ( $first_two === '|-' ) {
1123                                 # Now we have a table row
1124                                 $line = preg_replace( '#^\|-+#', '', $line );
1125
1126                                 # Whats after the tag is now only attributes
1127                                 $attributes = $this->mStripState->unstripBoth( $line );
1128                                 $attributes = Sanitizer::fixTagAttributes( $attributes, 'tr' );
1129                                 array_pop( $tr_attributes );
1130                                 array_push( $tr_attributes, $attributes );
1131
1132                                 $line = '';
1133                                 $last_tag = array_pop( $last_tag_history );
1134                                 array_pop( $has_opened_tr );
1135                                 array_push( $has_opened_tr, true );
1136
1137                                 if ( array_pop( $tr_history ) ) {
1138                                         $line = '</tr>';
1139                                 }
1140
1141                                 if ( array_pop( $td_history ) ) {
1142                                         $line = "</{$last_tag}>{$line}";
1143                                 }
1144
1145                                 $outLine = $line;
1146                                 array_push( $tr_history, false );
1147                                 array_push( $td_history, false );
1148                                 array_push( $last_tag_history, '' );
1149                         } elseif ( $first_character === '|'
1150                                 || $first_character === '!'
1151                                 || $first_two === '|+'
1152                         ) {
1153                                 # This might be cell elements, td, th or captions
1154                                 if ( $first_two === '|+' ) {
1155                                         $first_character = '+';
1156                                         $line = substr( $line, 2 );
1157                                 } else {
1158                                         $line = substr( $line, 1 );
1159                                 }
1160
1161                                 // Implies both are valid for table headings.
1162                                 if ( $first_character === '!' ) {
1163                                         $line = StringUtils::replaceMarkup( '!!', '||', $line );
1164                                 }
1165
1166                                 # Split up multiple cells on the same line.
1167                                 # FIXME : This can result in improper nesting of tags processed
1168                                 # by earlier parser steps.
1169                                 $cells = explode( '||', $line );
1170
1171                                 $outLine = '';
1172
1173                                 # Loop through each table cell
1174                                 foreach ( $cells as $cell ) {
1175                                         $previous = '';
1176                                         if ( $first_character !== '+' ) {
1177                                                 $tr_after = array_pop( $tr_attributes );
1178                                                 if ( !array_pop( $tr_history ) ) {
1179                                                         $previous = "<tr{$tr_after}>\n";
1180                                                 }
1181                                                 array_push( $tr_history, true );
1182                                                 array_push( $tr_attributes, '' );
1183                                                 array_pop( $has_opened_tr );
1184                                                 array_push( $has_opened_tr, true );
1185                                         }
1186
1187                                         $last_tag = array_pop( $last_tag_history );
1188
1189                                         if ( array_pop( $td_history ) ) {
1190                                                 $previous = "</{$last_tag}>\n{$previous}";
1191                                         }
1192
1193                                         if ( $first_character === '|' ) {
1194                                                 $last_tag = 'td';
1195                                         } elseif ( $first_character === '!' ) {
1196                                                 $last_tag = 'th';
1197                                         } elseif ( $first_character === '+' ) {
1198                                                 $last_tag = 'caption';
1199                                         } else {
1200                                                 $last_tag = '';
1201                                         }
1202
1203                                         array_push( $last_tag_history, $last_tag );
1204
1205                                         # A cell could contain both parameters and data
1206                                         $cell_data = explode( '|', $cell, 2 );
1207
1208                                         # T2553: Note that a '|' inside an invalid link should not
1209                                         # be mistaken as delimiting cell parameters
1210                                         # Bug T153140: Neither should language converter markup.
1211                                         if ( preg_match( '/\[\[|-\{/', $cell_data[0] ) === 1 ) {
1212                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
1213                                         } elseif ( count( $cell_data ) == 1 ) {
1214                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
1215                                         } else {
1216                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
1217                                                 $attributes = Sanitizer::fixTagAttributes( $attributes, $last_tag );
1218                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
1219                                         }
1220
1221                                         $outLine .= $cell;
1222                                         array_push( $td_history, true );
1223                                 }
1224                         }
1225                         $out .= $outLine . "\n";
1226                 }
1227
1228                 # Closing open td, tr && table
1229                 while ( count( $td_history ) > 0 ) {
1230                         if ( array_pop( $td_history ) ) {
1231                                 $out .= "</td>\n";
1232                         }
1233                         if ( array_pop( $tr_history ) ) {
1234                                 $out .= "</tr>\n";
1235                         }
1236                         if ( !array_pop( $has_opened_tr ) ) {
1237                                 $out .= "<tr><td></td></tr>\n";
1238                         }
1239
1240                         $out .= "</table>\n";
1241                 }
1242
1243                 # Remove trailing line-ending (b/c)
1244                 if ( substr( $out, -1 ) === "\n" ) {
1245                         $out = substr( $out, 0, -1 );
1246                 }
1247
1248                 # special case: don't return empty table
1249                 if ( $out === "<table>\n<tr><td></td></tr>\n</table>" ) {
1250                         $out = '';
1251                 }
1252
1253                 return $out;
1254         }
1255
1256         /**
1257          * Helper function for parse() that transforms wiki markup into half-parsed
1258          * HTML. Only called for $mOutputType == self::OT_HTML.
1259          *
1260          * @private
1261          *
1262          * @param string $text The text to parse
1263          * @param bool $isMain Whether this is being called from the main parse() function
1264          * @param PPFrame|bool $frame A pre-processor frame
1265          *
1266          * @return string
1267          */
1268         public function internalParse( $text, $isMain = true, $frame = false ) {
1269
1270                 $origText = $text;
1271
1272                 // Avoid PHP 7.1 warning from passing $this by reference
1273                 $parser = $this;
1274
1275                 # Hook to suspend the parser in this state
1276                 if ( !Hooks::run( 'ParserBeforeInternalParse', [ &$parser, &$text, &$this->mStripState ] ) ) {
1277                         return $text;
1278                 }
1279
1280                 # if $frame is provided, then use $frame for replacing any variables
1281                 if ( $frame ) {
1282                         # use frame depth to infer how include/noinclude tags should be handled
1283                         # depth=0 means this is the top-level document; otherwise it's an included document
1284                         if ( !$frame->depth ) {
1285                                 $flag = 0;
1286                         } else {
1287                                 $flag = Parser::PTD_FOR_INCLUSION;
1288                         }
1289                         $dom = $this->preprocessToDom( $text, $flag );
1290                         $text = $frame->expand( $dom );
1291                 } else {
1292                         # if $frame is not provided, then use old-style replaceVariables
1293                         $text = $this->replaceVariables( $text );
1294                 }
1295
1296                 Hooks::run( 'InternalParseBeforeSanitize', [ &$parser, &$text, &$this->mStripState ] );
1297                 $text = Sanitizer::removeHTMLtags(
1298                         $text,
1299                         [ $this, 'attributeStripCallback' ],
1300                         false,
1301                         array_keys( $this->mTransparentTagHooks ),
1302                         [],
1303                         [ $this, 'addTrackingCategory' ]
1304                 );
1305                 Hooks::run( 'InternalParseBeforeLinks', [ &$parser, &$text, &$this->mStripState ] );
1306
1307                 # Tables need to come after variable replacement for things to work
1308                 # properly; putting them before other transformations should keep
1309                 # exciting things like link expansions from showing up in surprising
1310                 # places.
1311                 $text = $this->doTableStuff( $text );
1312
1313                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
1314
1315                 $text = $this->doDoubleUnderscore( $text );
1316
1317                 $text = $this->doHeadings( $text );
1318                 $text = $this->replaceInternalLinks( $text );
1319                 $text = $this->doAllQuotes( $text );
1320                 $text = $this->replaceExternalLinks( $text );
1321
1322                 # replaceInternalLinks may sometimes leave behind
1323                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
1324                 $text = str_replace( self::MARKER_PREFIX . 'NOPARSE', '', $text );
1325
1326                 $text = $this->doMagicLinks( $text );
1327                 $text = $this->formatHeadings( $text, $origText, $isMain );
1328
1329                 return $text;
1330         }
1331
1332         /**
1333          * Helper function for parse() that transforms half-parsed HTML into fully
1334          * parsed HTML.
1335          *
1336          * @param string $text
1337          * @param bool $isMain
1338          * @param bool $linestart
1339          * @return string
1340          */
1341         private function internalParseHalfParsed( $text, $isMain = true, $linestart = true ) {
1342                 $text = $this->mStripState->unstripGeneral( $text );
1343
1344                 // Avoid PHP 7.1 warning from passing $this by reference
1345                 $parser = $this;
1346
1347                 if ( $isMain ) {
1348                         Hooks::run( 'ParserAfterUnstrip', [ &$parser, &$text ] );
1349                 }
1350
1351                 # Clean up special characters, only run once, next-to-last before doBlockLevels
1352                 $fixtags = [
1353                         # French spaces, last one Guillemet-left
1354                         # only if there is something before the space
1355                         '/(.) (?=\\?|:|;|!|%|\\302\\273)/' => '\\1&#160;',
1356                         # french spaces, Guillemet-right
1357                         '/(\\302\\253) /' => '\\1&#160;',
1358                         '/&#160;(!\s*important)/' => ' \\1', # Beware of CSS magic word !important, T13874.
1359                 ];
1360                 $text = preg_replace( array_keys( $fixtags ), array_values( $fixtags ), $text );
1361
1362                 $text = $this->doBlockLevels( $text, $linestart );
1363
1364                 $this->replaceLinkHolders( $text );
1365
1366                 /**
1367                  * The input doesn't get language converted if
1368                  * a) It's disabled
1369                  * b) Content isn't converted
1370                  * c) It's a conversion table
1371                  * d) it is an interface message (which is in the user language)
1372                  */
1373                 if ( !( $this->mOptions->getDisableContentConversion()
1374                         || isset( $this->mDoubleUnderscores['nocontentconvert'] ) )
1375                 ) {
1376                         if ( !$this->mOptions->getInterfaceMessage() ) {
1377                                 # The position of the convert() call should not be changed. it
1378                                 # assumes that the links are all replaced and the only thing left
1379                                 # is the <nowiki> mark.
1380                                 $text = $this->getConverterLanguage()->convert( $text );
1381                         }
1382                 }
1383
1384                 $text = $this->mStripState->unstripNoWiki( $text );
1385
1386                 if ( $isMain ) {
1387                         Hooks::run( 'ParserBeforeTidy', [ &$parser, &$text ] );
1388                 }
1389
1390                 $text = $this->replaceTransparentTags( $text );
1391                 $text = $this->mStripState->unstripGeneral( $text );
1392
1393                 $text = Sanitizer::normalizeCharReferences( $text );
1394
1395                 if ( MWTidy::isEnabled() ) {
1396                         if ( $this->mOptions->getTidy() ) {
1397                                 $text = MWTidy::tidy( $text );
1398                         }
1399                 } else {
1400                         # attempt to sanitize at least some nesting problems
1401                         # (T4702 and quite a few others)
1402                         $tidyregs = [
1403                                 # ''Something [http://www.cool.com cool''] -->
1404                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
1405                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
1406                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
1407                                 # fix up an anchor inside another anchor, only
1408                                 # at least for a single single nested link (T5695)
1409                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
1410                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
1411                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
1412                                 # contains a div, so fix it up here; replace
1413                                 # div with escaped text
1414                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
1415                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
1416                                 # remove empty italic or bold tag pairs, some
1417                                 # introduced by rules above
1418                                 '/<([bi])><\/\\1>/' => '',
1419                         ];
1420
1421                         $text = preg_replace(
1422                                 array_keys( $tidyregs ),
1423                                 array_values( $tidyregs ),
1424                                 $text );
1425                 }
1426
1427                 if ( $isMain ) {
1428                         Hooks::run( 'ParserAfterTidy', [ &$parser, &$text ] );
1429                 }
1430
1431                 return $text;
1432         }
1433
1434         /**
1435          * Replace special strings like "ISBN xxx" and "RFC xxx" with
1436          * magic external links.
1437          *
1438          * DML
1439          * @private
1440          *
1441          * @param string $text
1442          *
1443          * @return string
1444          */
1445         public function doMagicLinks( $text ) {
1446                 $prots = wfUrlProtocolsWithoutProtRel();
1447                 $urlChar = self::EXT_LINK_URL_CLASS;
1448                 $addr = self::EXT_LINK_ADDR;
1449                 $space = self::SPACE_NOT_NL; #  non-newline space
1450                 $spdash = "(?:-|$space)"; # a dash or a non-newline space
1451                 $spaces = "$space++"; # possessive match of 1 or more spaces
1452                 $text = preg_replace_callback(
1453                         '!(?:                            # Start cases
1454                                 (<a[ \t\r\n>].*?</a>) |      # m[1]: Skip link text
1455                                 (<.*?>) |                    # m[2]: Skip stuff inside
1456                                                              #       HTML elements' . "
1457                                 (\b(?i:$prots)($addr$urlChar*)) | # m[3]: Free external links
1458                                                              # m[4]: Post-protocol path
1459                                 \b(?:RFC|PMID) $spaces       # m[5]: RFC or PMID, capture number
1460                                         ([0-9]+)\b |
1461                                 \bISBN $spaces (             # m[6]: ISBN, capture number
1462                                         (?: 97[89] $spdash? )?   #  optional 13-digit ISBN prefix
1463                                         (?: [0-9]  $spdash? ){9} #  9 digits with opt. delimiters
1464                                         [0-9Xx]                  #  check digit
1465                                 )\b
1466                         )!xu", [ $this, 'magicLinkCallback' ], $text );
1467                 return $text;
1468         }
1469
1470         /**
1471          * @throws MWException
1472          * @param array $m
1473          * @return HTML|string
1474          */
1475         public function magicLinkCallback( $m ) {
1476                 if ( isset( $m[1] ) && $m[1] !== '' ) {
1477                         # Skip anchor
1478                         return $m[0];
1479                 } elseif ( isset( $m[2] ) && $m[2] !== '' ) {
1480                         # Skip HTML element
1481                         return $m[0];
1482                 } elseif ( isset( $m[3] ) && $m[3] !== '' ) {
1483                         # Free external link
1484                         return $this->makeFreeExternalLink( $m[0], strlen( $m[4] ) );
1485                 } elseif ( isset( $m[5] ) && $m[5] !== '' ) {
1486                         # RFC or PMID
1487                         if ( substr( $m[0], 0, 3 ) === 'RFC' ) {
1488                                 if ( !$this->mOptions->getMagicRFCLinks() ) {
1489                                         return $m[0];
1490                                 }
1491                                 $keyword = 'RFC';
1492                                 $urlmsg = 'rfcurl';
1493                                 $cssClass = 'mw-magiclink-rfc';
1494                                 $trackingCat = 'magiclink-tracking-rfc';
1495                                 $id = $m[5];
1496                         } elseif ( substr( $m[0], 0, 4 ) === 'PMID' ) {
1497                                 if ( !$this->mOptions->getMagicPMIDLinks() ) {
1498                                         return $m[0];
1499                                 }
1500                                 $keyword = 'PMID';
1501                                 $urlmsg = 'pubmedurl';
1502                                 $cssClass = 'mw-magiclink-pmid';
1503                                 $trackingCat = 'magiclink-tracking-pmid';
1504                                 $id = $m[5];
1505                         } else {
1506                                 throw new MWException( __METHOD__ . ': unrecognised match type "' .
1507                                         substr( $m[0], 0, 20 ) . '"' );
1508                         }
1509                         $url = wfMessage( $urlmsg, $id )->inContentLanguage()->text();
1510                         $this->addTrackingCategory( $trackingCat );
1511                         return Linker::makeExternalLink( $url, "{$keyword} {$id}", true, $cssClass, [], $this->mTitle );
1512                 } elseif ( isset( $m[6] ) && $m[6] !== ''
1513                         && $this->mOptions->getMagicISBNLinks()
1514                 ) {
1515                         # ISBN
1516                         $isbn = $m[6];
1517                         $space = self::SPACE_NOT_NL; #  non-newline space
1518                         $isbn = preg_replace( "/$space/", ' ', $isbn );
1519                         $num = strtr( $isbn, [
1520                                 '-' => '',
1521                                 ' ' => '',
1522                                 'x' => 'X',
1523                         ] );
1524                         $this->addTrackingCategory( 'magiclink-tracking-isbn' );
1525                         return $this->getLinkRenderer()->makeKnownLink(
1526                                 SpecialPage::getTitleFor( 'Booksources', $num ),
1527                                 "ISBN $isbn",
1528                                 [
1529                                         'class' => 'internal mw-magiclink-isbn',
1530                                         'title' => false // suppress title attribute
1531                                 ]
1532                         );
1533                 } else {
1534                         return $m[0];
1535                 }
1536         }
1537
1538         /**
1539          * Make a free external link, given a user-supplied URL
1540          *
1541          * @param string $url
1542          * @param int $numPostProto
1543          *   The number of characters after the protocol.
1544          * @return string HTML
1545          * @private
1546          */
1547         public function makeFreeExternalLink( $url, $numPostProto ) {
1548                 $trail = '';
1549
1550                 # The characters '<' and '>' (which were escaped by
1551                 # removeHTMLtags()) should not be included in
1552                 # URLs, per RFC 2396.
1553                 # Make &nbsp; terminate a URL as well (bug T84937)
1554                 $m2 = [];
1555                 if ( preg_match(
1556                         '/&(lt|gt|nbsp|#x0*(3[CcEe]|[Aa]0)|#0*(60|62|160));/',
1557                         $url,
1558                         $m2,
1559                         PREG_OFFSET_CAPTURE
1560                 ) ) {
1561                         $trail = substr( $url, $m2[0][1] ) . $trail;
1562                         $url = substr( $url, 0, $m2[0][1] );
1563                 }
1564
1565                 # Move trailing punctuation to $trail
1566                 $sep = ',;\.:!?';
1567                 # If there is no left bracket, then consider right brackets fair game too
1568                 if ( strpos( $url, '(' ) === false ) {
1569                         $sep .= ')';
1570                 }
1571
1572                 $urlRev = strrev( $url );
1573                 $numSepChars = strspn( $urlRev, $sep );
1574                 # Don't break a trailing HTML entity by moving the ; into $trail
1575                 # This is in hot code, so use substr_compare to avoid having to
1576                 # create a new string object for the comparison
1577                 if ( $numSepChars && substr_compare( $url, ";", -$numSepChars, 1 ) === 0 ) {
1578                         # more optimization: instead of running preg_match with a $
1579                         # anchor, which can be slow, do the match on the reversed
1580                         # string starting at the desired offset.
1581                         # un-reversed regexp is: /&([a-z]+|#x[\da-f]+|#\d+)$/i
1582                         if ( preg_match( '/\G([a-z]+|[\da-f]+x#|\d+#)&/i', $urlRev, $m2, 0, $numSepChars ) ) {
1583                                 $numSepChars--;
1584                         }
1585                 }
1586                 if ( $numSepChars ) {
1587                         $trail = substr( $url, -$numSepChars ) . $trail;
1588                         $url = substr( $url, 0, -$numSepChars );
1589                 }
1590
1591                 # Verify that we still have a real URL after trail removal, and
1592                 # not just lone protocol
1593                 if ( strlen( $trail ) >= $numPostProto ) {
1594                         return $url . $trail;
1595                 }
1596
1597                 $url = Sanitizer::cleanUrl( $url );
1598
1599                 # Is this an external image?
1600                 $text = $this->maybeMakeExternalImage( $url );
1601                 if ( $text === false ) {
1602                         # Not an image, make a link
1603                         $text = Linker::makeExternalLink( $url,
1604                                 $this->getConverterLanguage()->markNoConversion( $url, true ),
1605                                 true, 'free',
1606                                 $this->getExternalLinkAttribs( $url ), $this->mTitle );
1607                         # Register it in the output object...
1608                         # Replace unnecessary URL escape codes with their equivalent characters
1609                         $pasteurized = self::normalizeLinkUrl( $url );
1610                         $this->mOutput->addExternalLink( $pasteurized );
1611                 }
1612                 return $text . $trail;
1613         }
1614
1615         /**
1616          * Parse headers and return html
1617          *
1618          * @private
1619          *
1620          * @param string $text
1621          *
1622          * @return string
1623          */
1624         public function doHeadings( $text ) {
1625                 for ( $i = 6; $i >= 1; --$i ) {
1626                         $h = str_repeat( '=', $i );
1627                         $text = preg_replace( "/^$h(.+)$h\\s*$/m", "<h$i>\\1</h$i>", $text );
1628                 }
1629                 return $text;
1630         }
1631
1632         /**
1633          * Replace single quotes with HTML markup
1634          * @private
1635          *
1636          * @param string $text
1637          *
1638          * @return string The altered text
1639          */
1640         public function doAllQuotes( $text ) {
1641                 $outtext = '';
1642                 $lines = StringUtils::explode( "\n", $text );
1643                 foreach ( $lines as $line ) {
1644                         $outtext .= $this->doQuotes( $line ) . "\n";
1645                 }
1646                 $outtext = substr( $outtext, 0, -1 );
1647                 return $outtext;
1648         }
1649
1650         /**
1651          * Helper function for doAllQuotes()
1652          *
1653          * @param string $text
1654          *
1655          * @return string
1656          */
1657         public function doQuotes( $text ) {
1658                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1659                 $countarr = count( $arr );
1660                 if ( $countarr == 1 ) {
1661                         return $text;
1662                 }
1663
1664                 // First, do some preliminary work. This may shift some apostrophes from
1665                 // being mark-up to being text. It also counts the number of occurrences
1666                 // of bold and italics mark-ups.
1667                 $numbold = 0;
1668                 $numitalics = 0;
1669                 for ( $i = 1; $i < $countarr; $i += 2 ) {
1670                         $thislen = strlen( $arr[$i] );
1671                         // If there are ever four apostrophes, assume the first is supposed to
1672                         // be text, and the remaining three constitute mark-up for bold text.
1673                         // (T15227: ''''foo'''' turns into ' ''' foo ' ''')
1674                         if ( $thislen == 4 ) {
1675                                 $arr[$i - 1] .= "'";
1676                                 $arr[$i] = "'''";
1677                                 $thislen = 3;
1678                         } elseif ( $thislen > 5 ) {
1679                                 // If there are more than 5 apostrophes in a row, assume they're all
1680                                 // text except for the last 5.
1681                                 // (T15227: ''''''foo'''''' turns into ' ''''' foo ' ''''')
1682                                 $arr[$i - 1] .= str_repeat( "'", $thislen - 5 );
1683                                 $arr[$i] = "'''''";
1684                                 $thislen = 5;
1685                         }
1686                         // Count the number of occurrences of bold and italics mark-ups.
1687                         if ( $thislen == 2 ) {
1688                                 $numitalics++;
1689                         } elseif ( $thislen == 3 ) {
1690                                 $numbold++;
1691                         } elseif ( $thislen == 5 ) {
1692                                 $numitalics++;
1693                                 $numbold++;
1694                         }
1695                 }
1696
1697                 // If there is an odd number of both bold and italics, it is likely
1698                 // that one of the bold ones was meant to be an apostrophe followed
1699                 // by italics. Which one we cannot know for certain, but it is more
1700                 // likely to be one that has a single-letter word before it.
1701                 if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) ) {
1702                         $firstsingleletterword = -1;
1703                         $firstmultiletterword = -1;
1704                         $firstspace = -1;
1705                         for ( $i = 1; $i < $countarr; $i += 2 ) {
1706                                 if ( strlen( $arr[$i] ) == 3 ) {
1707                                         $x1 = substr( $arr[$i - 1], -1 );
1708                                         $x2 = substr( $arr[$i - 1], -2, 1 );
1709                                         if ( $x1 === ' ' ) {
1710                                                 if ( $firstspace == -1 ) {
1711                                                         $firstspace = $i;
1712                                                 }
1713                                         } elseif ( $x2 === ' ' ) {
1714                                                 $firstsingleletterword = $i;
1715                                                 // if $firstsingleletterword is set, we don't
1716                                                 // look at the other options, so we can bail early.
1717                                                 break;
1718                                         } else {
1719                                                 if ( $firstmultiletterword == -1 ) {
1720                                                         $firstmultiletterword = $i;
1721                                                 }
1722                                         }
1723                                 }
1724                         }
1725
1726                         // If there is a single-letter word, use it!
1727                         if ( $firstsingleletterword > -1 ) {
1728                                 $arr[$firstsingleletterword] = "''";
1729                                 $arr[$firstsingleletterword - 1] .= "'";
1730                         } elseif ( $firstmultiletterword > -1 ) {
1731                                 // If not, but there's a multi-letter word, use that one.
1732                                 $arr[$firstmultiletterword] = "''";
1733                                 $arr[$firstmultiletterword - 1] .= "'";
1734                         } elseif ( $firstspace > -1 ) {
1735                                 // ... otherwise use the first one that has neither.
1736                                 // (notice that it is possible for all three to be -1 if, for example,
1737                                 // there is only one pentuple-apostrophe in the line)
1738                                 $arr[$firstspace] = "''";
1739                                 $arr[$firstspace - 1] .= "'";
1740                         }
1741                 }
1742
1743                 // Now let's actually convert our apostrophic mush to HTML!
1744                 $output = '';
1745                 $buffer = '';
1746                 $state = '';
1747                 $i = 0;
1748                 foreach ( $arr as $r ) {
1749                         if ( ( $i % 2 ) == 0 ) {
1750                                 if ( $state === 'both' ) {
1751                                         $buffer .= $r;
1752                                 } else {
1753                                         $output .= $r;
1754                                 }
1755                         } else {
1756                                 $thislen = strlen( $r );
1757                                 if ( $thislen == 2 ) {
1758                                         if ( $state === 'i' ) {
1759                                                 $output .= '</i>';
1760                                                 $state = '';
1761                                         } elseif ( $state === 'bi' ) {
1762                                                 $output .= '</i>';
1763                                                 $state = 'b';
1764                                         } elseif ( $state === 'ib' ) {
1765                                                 $output .= '</b></i><b>';
1766                                                 $state = 'b';
1767                                         } elseif ( $state === 'both' ) {
1768                                                 $output .= '<b><i>' . $buffer . '</i>';
1769                                                 $state = 'b';
1770                                         } else { // $state can be 'b' or ''
1771                                                 $output .= '<i>';
1772                                                 $state .= 'i';
1773                                         }
1774                                 } elseif ( $thislen == 3 ) {
1775                                         if ( $state === 'b' ) {
1776                                                 $output .= '</b>';
1777                                                 $state = '';
1778                                         } elseif ( $state === 'bi' ) {
1779                                                 $output .= '</i></b><i>';
1780                                                 $state = 'i';
1781                                         } elseif ( $state === 'ib' ) {
1782                                                 $output .= '</b>';
1783                                                 $state = 'i';
1784                                         } elseif ( $state === 'both' ) {
1785                                                 $output .= '<i><b>' . $buffer . '</b>';
1786                                                 $state = 'i';
1787                                         } else { // $state can be 'i' or ''
1788                                                 $output .= '<b>';
1789                                                 $state .= 'b';
1790                                         }
1791                                 } elseif ( $thislen == 5 ) {
1792                                         if ( $state === 'b' ) {
1793                                                 $output .= '</b><i>';
1794                                                 $state = 'i';
1795                                         } elseif ( $state === 'i' ) {
1796                                                 $output .= '</i><b>';
1797                                                 $state = 'b';
1798                                         } elseif ( $state === 'bi' ) {
1799                                                 $output .= '</i></b>';
1800                                                 $state = '';
1801                                         } elseif ( $state === 'ib' ) {
1802                                                 $output .= '</b></i>';
1803                                                 $state = '';
1804                                         } elseif ( $state === 'both' ) {
1805                                                 $output .= '<i><b>' . $buffer . '</b></i>';
1806                                                 $state = '';
1807                                         } else { // ($state == '')
1808                                                 $buffer = '';
1809                                                 $state = 'both';
1810                                         }
1811                                 }
1812                         }
1813                         $i++;
1814                 }
1815                 // Now close all remaining tags.  Notice that the order is important.
1816                 if ( $state === 'b' || $state === 'ib' ) {
1817                         $output .= '</b>';
1818                 }
1819                 if ( $state === 'i' || $state === 'bi' || $state === 'ib' ) {
1820                         $output .= '</i>';
1821                 }
1822                 if ( $state === 'bi' ) {
1823                         $output .= '</b>';
1824                 }
1825                 // There might be lonely ''''', so make sure we have a buffer
1826                 if ( $state === 'both' && $buffer ) {
1827                         $output .= '<b><i>' . $buffer . '</i></b>';
1828                 }
1829                 return $output;
1830         }
1831
1832         /**
1833          * Replace external links (REL)
1834          *
1835          * Note: this is all very hackish and the order of execution matters a lot.
1836          * Make sure to run tests/parser/parserTests.php if you change this code.
1837          *
1838          * @private
1839          *
1840          * @param string $text
1841          *
1842          * @throws MWException
1843          * @return string
1844          */
1845         public function replaceExternalLinks( $text ) {
1846
1847                 $bits = preg_split( $this->mExtLinkBracketedRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1848                 if ( $bits === false ) {
1849                         throw new MWException( "PCRE needs to be compiled with "
1850                                 . "--enable-unicode-properties in order for MediaWiki to function" );
1851                 }
1852                 $s = array_shift( $bits );
1853
1854                 $i = 0;
1855                 while ( $i < count( $bits ) ) {
1856                         $url = $bits[$i++];
1857                         $i++; // protocol
1858                         $text = $bits[$i++];
1859                         $trail = $bits[$i++];
1860
1861                         # The characters '<' and '>' (which were escaped by
1862                         # removeHTMLtags()) should not be included in
1863                         # URLs, per RFC 2396.
1864                         $m2 = [];
1865                         if ( preg_match( '/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE ) ) {
1866                                 $text = substr( $url, $m2[0][1] ) . ' ' . $text;
1867                                 $url = substr( $url, 0, $m2[0][1] );
1868                         }
1869
1870                         # If the link text is an image URL, replace it with an <img> tag
1871                         # This happened by accident in the original parser, but some people used it extensively
1872                         $img = $this->maybeMakeExternalImage( $text );
1873                         if ( $img !== false ) {
1874                                 $text = $img;
1875                         }
1876
1877                         $dtrail = '';
1878
1879                         # Set linktype for CSS - if URL==text, link is essentially free
1880                         $linktype = ( $text === $url ) ? 'free' : 'text';
1881
1882                         # No link text, e.g. [http://domain.tld/some.link]
1883                         if ( $text == '' ) {
1884                                 # Autonumber
1885                                 $langObj = $this->getTargetLanguage();
1886                                 $text = '[' . $langObj->formatNum( ++$this->mAutonumber ) . ']';
1887                                 $linktype = 'autonumber';
1888                         } else {
1889                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1890                                 # Check for trail
1891                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1892                         }
1893
1894                         $text = $this->getConverterLanguage()->markNoConversion( $text );
1895
1896                         $url = Sanitizer::cleanUrl( $url );
1897
1898                         # Use the encoded URL
1899                         # This means that users can paste URLs directly into the text
1900                         # Funny characters like ö aren't valid in URLs anyway
1901                         # This was changed in August 2004
1902                         $s .= Linker::makeExternalLink( $url, $text, false, $linktype,
1903                                 $this->getExternalLinkAttribs( $url ), $this->mTitle ) . $dtrail . $trail;
1904
1905                         # Register link in the output object.
1906                         # Replace unnecessary URL escape codes with the referenced character
1907                         # This prevents spammers from hiding links from the filters
1908                         $pasteurized = self::normalizeLinkUrl( $url );
1909                         $this->mOutput->addExternalLink( $pasteurized );
1910                 }
1911
1912                 return $s;
1913         }
1914
1915         /**
1916          * Get the rel attribute for a particular external link.
1917          *
1918          * @since 1.21
1919          * @param string|bool $url Optional URL, to extract the domain from for rel =>
1920          *   nofollow if appropriate
1921          * @param Title $title Optional Title, for wgNoFollowNsExceptions lookups
1922          * @return string|null Rel attribute for $url
1923          */
1924         public static function getExternalLinkRel( $url = false, $title = null ) {
1925                 global $wgNoFollowLinks, $wgNoFollowNsExceptions, $wgNoFollowDomainExceptions;
1926                 $ns = $title ? $title->getNamespace() : false;
1927                 if ( $wgNoFollowLinks && !in_array( $ns, $wgNoFollowNsExceptions )
1928                         && !wfMatchesDomainList( $url, $wgNoFollowDomainExceptions )
1929                 ) {
1930                         return 'nofollow';
1931                 }
1932                 return null;
1933         }
1934
1935         /**
1936          * Get an associative array of additional HTML attributes appropriate for a
1937          * particular external link.  This currently may include rel => nofollow
1938          * (depending on configuration, namespace, and the URL's domain) and/or a
1939          * target attribute (depending on configuration).
1940          *
1941          * @param string $url URL to extract the domain from for rel =>
1942          *   nofollow if appropriate
1943          * @return array Associative array of HTML attributes
1944          */
1945         public function getExternalLinkAttribs( $url ) {
1946                 $attribs = [];
1947                 $rel = self::getExternalLinkRel( $url, $this->mTitle );
1948
1949                 $target = $this->mOptions->getExternalLinkTarget();
1950                 if ( $target ) {
1951                         $attribs['target'] = $target;
1952                         if ( !in_array( $target, [ '_self', '_parent', '_top' ] ) ) {
1953                                 // T133507. New windows can navigate parent cross-origin.
1954                                 // Including noreferrer due to lacking browser
1955                                 // support of noopener. Eventually noreferrer should be removed.
1956                                 if ( $rel !== '' ) {
1957                                         $rel .= ' ';
1958                                 }
1959                                 $rel .= 'noreferrer noopener';
1960                         }
1961                 }
1962                 $attribs['rel'] = $rel;
1963                 return $attribs;
1964         }
1965
1966         /**
1967          * Replace unusual escape codes in a URL with their equivalent characters
1968          *
1969          * This generally follows the syntax defined in RFC 3986, with special
1970          * consideration for HTTP query strings.
1971          *
1972          * @param string $url
1973          * @return string
1974          */
1975         public static function normalizeLinkUrl( $url ) {
1976                 # First, make sure unsafe characters are encoded
1977                 $url = preg_replace_callback( '/[\x00-\x20"<>\[\\\\\]^`{|}\x7F-\xFF]/',
1978                         function ( $m ) {
1979                                 return rawurlencode( $m[0] );
1980                         },
1981                         $url
1982                 );
1983
1984                 $ret = '';
1985                 $end = strlen( $url );
1986
1987                 # Fragment part - 'fragment'
1988                 $start = strpos( $url, '#' );
1989                 if ( $start !== false && $start < $end ) {
1990                         $ret = self::normalizeUrlComponent(
1991                                 substr( $url, $start, $end - $start ), '"#%<>[\]^`{|}' ) . $ret;
1992                         $end = $start;
1993                 }
1994
1995                 # Query part - 'query' minus &=+;
1996                 $start = strpos( $url, '?' );
1997                 if ( $start !== false && $start < $end ) {
1998                         $ret = self::normalizeUrlComponent(
1999                                 substr( $url, $start, $end - $start ), '"#%<>[\]^`{|}&=+;' ) . $ret;
2000                         $end = $start;
2001                 }
2002
2003                 # Scheme and path part - 'pchar'
2004                 # (we assume no userinfo or encoded colons in the host)
2005                 $ret = self::normalizeUrlComponent(
2006                         substr( $url, 0, $end ), '"#%<>[\]^`{|}/?' ) . $ret;
2007
2008                 return $ret;
2009         }
2010
2011         private static function normalizeUrlComponent( $component, $unsafe ) {
2012                 $callback = function ( $matches ) use ( $unsafe ) {
2013                         $char = urldecode( $matches[0] );
2014                         $ord = ord( $char );
2015                         if ( $ord > 32 && $ord < 127 && strpos( $unsafe, $char ) === false ) {
2016                                 # Unescape it
2017                                 return $char;
2018                         } else {
2019                                 # Leave it escaped, but use uppercase for a-f
2020                                 return strtoupper( $matches[0] );
2021                         }
2022                 };
2023                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/', $callback, $component );
2024         }
2025
2026         /**
2027          * make an image if it's allowed, either through the global
2028          * option, through the exception, or through the on-wiki whitelist
2029          *
2030          * @param string $url
2031          *
2032          * @return string
2033          */
2034         private function maybeMakeExternalImage( $url ) {
2035                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
2036                 $imagesexception = !empty( $imagesfrom );
2037                 $text = false;
2038                 # $imagesfrom could be either a single string or an array of strings, parse out the latter
2039                 if ( $imagesexception && is_array( $imagesfrom ) ) {
2040                         $imagematch = false;
2041                         foreach ( $imagesfrom as $match ) {
2042                                 if ( strpos( $url, $match ) === 0 ) {
2043                                         $imagematch = true;
2044                                         break;
2045                                 }
2046                         }
2047                 } elseif ( $imagesexception ) {
2048                         $imagematch = ( strpos( $url, $imagesfrom ) === 0 );
2049                 } else {
2050                         $imagematch = false;
2051                 }
2052
2053                 if ( $this->mOptions->getAllowExternalImages()
2054                         || ( $imagesexception && $imagematch )
2055                 ) {
2056                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
2057                                 # Image found
2058                                 $text = Linker::makeExternalImage( $url );
2059                         }
2060                 }
2061                 if ( !$text && $this->mOptions->getEnableImageWhitelist()
2062                         && preg_match( self::EXT_IMAGE_REGEX, $url )
2063                 ) {
2064                         $whitelist = explode(
2065                                 "\n",
2066                                 wfMessage( 'external_image_whitelist' )->inContentLanguage()->text()
2067                         );
2068
2069                         foreach ( $whitelist as $entry ) {
2070                                 # Sanitize the regex fragment, make it case-insensitive, ignore blank entries/comments
2071                                 if ( strpos( $entry, '#' ) === 0 || $entry === '' ) {
2072                                         continue;
2073                                 }
2074                                 if ( preg_match( '/' . str_replace( '/', '\\/', $entry ) . '/i', $url ) ) {
2075                                         # Image matches a whitelist entry
2076                                         $text = Linker::makeExternalImage( $url );
2077                                         break;
2078                                 }
2079                         }
2080                 }
2081                 return $text;
2082         }
2083
2084         /**
2085          * Process [[ ]] wikilinks
2086          *
2087          * @param string $s
2088          *
2089          * @return string Processed text
2090          *
2091          * @private
2092          */
2093         public function replaceInternalLinks( $s ) {
2094                 $this->mLinkHolders->merge( $this->replaceInternalLinks2( $s ) );
2095                 return $s;
2096         }
2097
2098         /**
2099          * Process [[ ]] wikilinks (RIL)
2100          * @param string $s
2101          * @throws MWException
2102          * @return LinkHolderArray
2103          *
2104          * @private
2105          */
2106         public function replaceInternalLinks2( &$s ) {
2107                 global $wgExtraInterlanguageLinkPrefixes;
2108
2109                 static $tc = false, $e1, $e1_img;
2110                 # the % is needed to support urlencoded titles as well
2111                 if ( !$tc ) {
2112                         $tc = Title::legalChars() . '#%';
2113                         # Match a link having the form [[namespace:link|alternate]]trail
2114                         $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD";
2115                         # Match cases where there is no "]]", which might still be images
2116                         $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD";
2117                 }
2118
2119                 $holders = new LinkHolderArray( $this );
2120
2121                 # split the entire text string on occurrences of [[
2122                 $a = StringUtils::explode( '[[', ' ' . $s );
2123                 # get the first element (all text up to first [[), and remove the space we added
2124                 $s = $a->current();
2125                 $a->next();
2126                 $line = $a->current(); # Workaround for broken ArrayIterator::next() that returns "void"
2127                 $s = substr( $s, 1 );
2128
2129                 $useLinkPrefixExtension = $this->getTargetLanguage()->linkPrefixExtension();
2130                 $e2 = null;
2131                 if ( $useLinkPrefixExtension ) {
2132                         # Match the end of a line for a word that's not followed by whitespace,
2133                         # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
2134                         global $wgContLang;
2135                         $charset = $wgContLang->linkPrefixCharset();
2136                         $e2 = "/^((?>.*[^$charset]|))(.+)$/sDu";
2137                 }
2138
2139                 if ( is_null( $this->mTitle ) ) {
2140                         throw new MWException( __METHOD__ . ": \$this->mTitle is null\n" );
2141                 }
2142                 $nottalk = !$this->mTitle->isTalkPage();
2143
2144                 if ( $useLinkPrefixExtension ) {
2145                         $m = [];
2146                         if ( preg_match( $e2, $s, $m ) ) {
2147                                 $first_prefix = $m[2];
2148                         } else {
2149                                 $first_prefix = false;
2150                         }
2151                 } else {
2152                         $prefix = '';
2153                 }
2154
2155                 $useSubpages = $this->areSubpagesAllowed();
2156
2157                 // @codingStandardsIgnoreStart Squiz.WhiteSpace.SemicolonSpacing.Incorrect
2158                 # Loop for each link
2159                 for ( ; $line !== false && $line !== null; $a->next(), $line = $a->current() ) {
2160                         // @codingStandardsIgnoreEnd
2161
2162                         # Check for excessive memory usage
2163                         if ( $holders->isBig() ) {
2164                                 # Too big
2165                                 # Do the existence check, replace the link holders and clear the array
2166                                 $holders->replace( $s );
2167                                 $holders->clear();
2168                         }
2169
2170                         if ( $useLinkPrefixExtension ) {
2171                                 if ( preg_match( $e2, $s, $m ) ) {
2172                                         $prefix = $m[2];
2173                                         $s = $m[1];
2174                                 } else {
2175                                         $prefix = '';
2176                                 }
2177                                 # first link
2178                                 if ( $first_prefix ) {
2179                                         $prefix = $first_prefix;
2180                                         $first_prefix = false;
2181                                 }
2182                         }
2183
2184                         $might_be_img = false;
2185
2186                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
2187                                 $text = $m[2];
2188                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
2189                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
2190                                 # the real problem is with the $e1 regex
2191                                 # See T1500.
2192                                 # Still some problems for cases where the ] is meant to be outside punctuation,
2193                                 # and no image is in sight. See T4095.
2194                                 if ( $text !== ''
2195                                         && substr( $m[3], 0, 1 ) === ']'
2196                                         && strpos( $text, '[' ) !== false
2197                                 ) {
2198                                         $text .= ']'; # so that replaceExternalLinks($text) works later
2199                                         $m[3] = substr( $m[3], 1 );
2200                                 }
2201                                 # fix up urlencoded title texts
2202                                 if ( strpos( $m[1], '%' ) !== false ) {
2203                                         # Should anchors '#' also be rejected?
2204                                         $m[1] = str_replace( [ '<', '>' ], [ '&lt;', '&gt;' ], rawurldecode( $m[1] ) );
2205                                 }
2206                                 $trail = $m[3];
2207                         } elseif ( preg_match( $e1_img, $line, $m ) ) {
2208                                 # Invalid, but might be an image with a link in its caption
2209                                 $might_be_img = true;
2210                                 $text = $m[2];
2211                                 if ( strpos( $m[1], '%' ) !== false ) {
2212                                         $m[1] = str_replace( [ '<', '>' ], [ '&lt;', '&gt;' ], rawurldecode( $m[1] ) );
2213                                 }
2214                                 $trail = "";
2215                         } else { # Invalid form; output directly
2216                                 $s .= $prefix . '[[' . $line;
2217                                 continue;
2218                         }
2219
2220                         $origLink = ltrim( $m[1], ' ' );
2221
2222                         # Don't allow internal links to pages containing
2223                         # PROTO: where PROTO is a valid URL protocol; these
2224                         # should be external links.
2225                         if ( preg_match( '/^(?i:' . $this->mUrlProtocols . ')/', $origLink ) ) {
2226                                 $s .= $prefix . '[[' . $line;
2227                                 continue;
2228                         }
2229
2230                         # Make subpage if necessary
2231                         if ( $useSubpages ) {
2232                                 $link = $this->maybeDoSubpageLink( $origLink, $text );
2233                         } else {
2234                                 $link = $origLink;
2235                         }
2236
2237                         $noforce = ( substr( $origLink, 0, 1 ) !== ':' );
2238                         if ( !$noforce ) {
2239                                 # Strip off leading ':'
2240                                 $link = substr( $link, 1 );
2241                         }
2242
2243                         $unstrip = $this->mStripState->unstripNoWiki( $link );
2244                         $nt = is_string( $unstrip ) ? Title::newFromText( $unstrip ) : null;
2245                         if ( $nt === null ) {
2246                                 $s .= $prefix . '[[' . $line;
2247                                 continue;
2248                         }
2249
2250                         $ns = $nt->getNamespace();
2251                         $iw = $nt->getInterwiki();
2252
2253                         if ( $might_be_img ) { # if this is actually an invalid link
2254                                 if ( $ns == NS_FILE && $noforce ) { # but might be an image
2255                                         $found = false;
2256                                         while ( true ) {
2257                                                 # look at the next 'line' to see if we can close it there
2258                                                 $a->next();
2259                                                 $next_line = $a->current();
2260                                                 if ( $next_line === false || $next_line === null ) {
2261                                                         break;
2262                                                 }
2263                                                 $m = explode( ']]', $next_line, 3 );
2264                                                 if ( count( $m ) == 3 ) {
2265                                                         # the first ]] closes the inner link, the second the image
2266                                                         $found = true;
2267                                                         $text .= "[[{$m[0]}]]{$m[1]}";
2268                                                         $trail = $m[2];
2269                                                         break;
2270                                                 } elseif ( count( $m ) == 2 ) {
2271                                                         # if there's exactly one ]] that's fine, we'll keep looking
2272                                                         $text .= "[[{$m[0]}]]{$m[1]}";
2273                                                 } else {
2274                                                         # if $next_line is invalid too, we need look no further
2275                                                         $text .= '[[' . $next_line;
2276                                                         break;
2277                                                 }
2278                                         }
2279                                         if ( !$found ) {
2280                                                 # we couldn't find the end of this imageLink, so output it raw
2281                                                 # but don't ignore what might be perfectly normal links in the text we've examined
2282                                                 $holders->merge( $this->replaceInternalLinks2( $text ) );
2283                                                 $s .= "{$prefix}[[$link|$text";
2284                                                 # note: no $trail, because without an end, there *is* no trail
2285                                                 continue;
2286                                         }
2287                                 } else { # it's not an image, so output it raw
2288                                         $s .= "{$prefix}[[$link|$text";
2289                                         # note: no $trail, because without an end, there *is* no trail
2290                                         continue;
2291                                 }
2292                         }
2293
2294                         $wasblank = ( $text == '' );
2295                         if ( $wasblank ) {
2296                                 $text = $link;
2297                         } else {
2298                                 # T6598 madness. Handle the quotes only if they come from the alternate part
2299                                 # [[Lista d''e paise d''o munno]] -> <a href="...">Lista d''e paise d''o munno</a>
2300                                 # [[Criticism of Harry Potter|Criticism of ''Harry Potter'']]
2301                                 #    -> <a href="Criticism of Harry Potter">Criticism of <i>Harry Potter</i></a>
2302                                 $text = $this->doQuotes( $text );
2303                         }
2304
2305                         # Link not escaped by : , create the various objects
2306                         if ( $noforce && !$nt->wasLocalInterwiki() ) {
2307                                 # Interwikis
2308                                 if (
2309                                         $iw && $this->mOptions->getInterwikiMagic() && $nottalk && (
2310                                                 Language::fetchLanguageName( $iw, null, 'mw' ) ||
2311                                                 in_array( $iw, $wgExtraInterlanguageLinkPrefixes )
2312                                         )
2313                                 ) {
2314                                         # T26502: filter duplicates
2315                                         if ( !isset( $this->mLangLinkLanguages[$iw] ) ) {
2316                                                 $this->mLangLinkLanguages[$iw] = true;
2317                                                 $this->mOutput->addLanguageLink( $nt->getFullText() );
2318                                         }
2319
2320                                         $s = rtrim( $s . $prefix );
2321                                         $s .= trim( $trail, "\n" ) == '' ? '': $prefix . $trail;
2322                                         continue;
2323                                 }
2324
2325                                 if ( $ns == NS_FILE ) {
2326                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
2327                                                 if ( $wasblank ) {
2328                                                         # if no parameters were passed, $text
2329                                                         # becomes something like "File:Foo.png",
2330                                                         # which we don't want to pass on to the
2331                                                         # image generator
2332                                                         $text = '';
2333                                                 } else {
2334                                                         # recursively parse links inside the image caption
2335                                                         # actually, this will parse them in any other parameters, too,
2336                                                         # but it might be hard to fix that, and it doesn't matter ATM
2337                                                         $text = $this->replaceExternalLinks( $text );
2338                                                         $holders->merge( $this->replaceInternalLinks2( $text ) );
2339                                                 }
2340                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
2341                                                 $s .= $prefix . $this->armorLinks(
2342                                                         $this->makeImage( $nt, $text, $holders ) ) . $trail;
2343                                                 continue;
2344                                         }
2345                                 } elseif ( $ns == NS_CATEGORY ) {
2346                                         $s = rtrim( $s . "\n" ); # T2087
2347
2348                                         if ( $wasblank ) {
2349                                                 $sortkey = $this->getDefaultSort();
2350                                         } else {
2351                                                 $sortkey = $text;
2352                                         }
2353                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
2354                                         $sortkey = str_replace( "\n", '', $sortkey );
2355                                         $sortkey = $this->getConverterLanguage()->convertCategoryKey( $sortkey );
2356                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
2357
2358                                         /**
2359                                          * Strip the whitespace Category links produce, see T2087
2360                                          */
2361                                         $s .= trim( $prefix . $trail, "\n" ) == '' ? '' : $prefix . $trail;
2362
2363                                         continue;
2364                                 }
2365                         }
2366
2367                         # Self-link checking. For some languages, variants of the title are checked in
2368                         # LinkHolderArray::doVariants() to allow batching the existence checks necessary
2369                         # for linking to a different variant.
2370                         if ( $ns != NS_SPECIAL && $nt->equals( $this->mTitle ) && !$nt->hasFragment() ) {
2371                                 $s .= $prefix . Linker::makeSelfLinkObj( $nt, $text, '', $trail );
2372                                 continue;
2373                         }
2374
2375                         # NS_MEDIA is a pseudo-namespace for linking directly to a file
2376                         # @todo FIXME: Should do batch file existence checks, see comment below
2377                         if ( $ns == NS_MEDIA ) {
2378                                 # Give extensions a chance to select the file revision for us
2379                                 $options = [];
2380                                 $descQuery = false;
2381                                 Hooks::run( 'BeforeParserFetchFileAndTitle',
2382                                         [ $this, $nt, &$options, &$descQuery ] );
2383                                 # Fetch and register the file (file title may be different via hooks)
2384                                 list( $file, $nt ) = $this->fetchFileAndTitle( $nt, $options );
2385                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
2386                                 $s .= $prefix . $this->armorLinks(
2387                                         Linker::makeMediaLinkFile( $nt, $file, $text ) ) . $trail;
2388                                 continue;
2389                         }
2390
2391                         # Some titles, such as valid special pages or files in foreign repos, should
2392                         # be shown as bluelinks even though they're not included in the page table
2393                         # @todo FIXME: isAlwaysKnown() can be expensive for file links; we should really do
2394                         # batch file existence checks for NS_FILE and NS_MEDIA
2395                         if ( $iw == '' && $nt->isAlwaysKnown() ) {
2396                                 $this->mOutput->addLink( $nt );
2397                                 $s .= $this->makeKnownLinkHolder( $nt, $text, $trail, $prefix );
2398                         } else {
2399                                 # Links will be added to the output link list after checking
2400                                 $s .= $holders->makeHolder( $nt, $text, [], $trail, $prefix );
2401                         }
2402                 }
2403                 return $holders;
2404         }
2405
2406         /**
2407          * Render a forced-blue link inline; protect against double expansion of
2408          * URLs if we're in a mode that prepends full URL prefixes to internal links.
2409          * Since this little disaster has to split off the trail text to avoid
2410          * breaking URLs in the following text without breaking trails on the
2411          * wiki links, it's been made into a horrible function.
2412          *
2413          * @param Title $nt
2414          * @param string $text
2415          * @param string $trail
2416          * @param string $prefix
2417          * @return string HTML-wikitext mix oh yuck
2418          */
2419         protected function makeKnownLinkHolder( $nt, $text = '', $trail = '', $prefix = '' ) {
2420                 list( $inside, $trail ) = Linker::splitTrail( $trail );
2421
2422                 if ( $text == '' ) {
2423                         $text = htmlspecialchars( $nt->getPrefixedText() );
2424                 }
2425
2426                 $link = $this->getLinkRenderer()->makeKnownLink(
2427                         $nt, new HtmlArmor( "$prefix$text$inside" )
2428                 );
2429
2430                 return $this->armorLinks( $link ) . $trail;
2431         }
2432
2433         /**
2434          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
2435          * going to go through further parsing steps before inline URL expansion.
2436          *
2437          * Not needed quite as much as it used to be since free links are a bit
2438          * more sensible these days. But bracketed links are still an issue.
2439          *
2440          * @param string $text More-or-less HTML
2441          * @return string Less-or-more HTML with NOPARSE bits
2442          */
2443         public function armorLinks( $text ) {
2444                 return preg_replace( '/\b((?i)' . $this->mUrlProtocols . ')/',
2445                         self::MARKER_PREFIX . "NOPARSE$1", $text );
2446         }
2447
2448         /**
2449          * Return true if subpage links should be expanded on this page.
2450          * @return bool
2451          */
2452         public function areSubpagesAllowed() {
2453                 # Some namespaces don't allow subpages
2454                 return MWNamespace::hasSubpages( $this->mTitle->getNamespace() );
2455         }
2456
2457         /**
2458          * Handle link to subpage if necessary
2459          *
2460          * @param string $target The source of the link
2461          * @param string &$text The link text, modified as necessary
2462          * @return string The full name of the link
2463          * @private
2464          */
2465         public function maybeDoSubpageLink( $target, &$text ) {
2466                 return Linker::normalizeSubpageLink( $this->mTitle, $target, $text );
2467         }
2468
2469         /**
2470          * Make lists from lines starting with ':', '*', '#', etc. (DBL)
2471          *
2472          * @param string $text
2473          * @param bool $linestart Whether or not this is at the start of a line.
2474          * @private
2475          * @return string The lists rendered as HTML
2476          */
2477         public function doBlockLevels( $text, $linestart ) {
2478                 return BlockLevelPass::doBlockLevels( $text, $linestart );
2479         }
2480
2481         /**
2482          * Return value of a magic variable (like PAGENAME)
2483          *
2484          * @private
2485          *
2486          * @param int $index
2487          * @param bool|PPFrame $frame
2488          *
2489          * @throws MWException
2490          * @return string
2491          */
2492         public function getVariableValue( $index, $frame = false ) {
2493                 global $wgContLang, $wgSitename, $wgServer, $wgServerName;
2494                 global $wgArticlePath, $wgScriptPath, $wgStylePath;
2495
2496                 if ( is_null( $this->mTitle ) ) {
2497                         // If no title set, bad things are going to happen
2498                         // later. Title should always be set since this
2499                         // should only be called in the middle of a parse
2500                         // operation (but the unit-tests do funky stuff)
2501                         throw new MWException( __METHOD__ . ' Should only be '
2502                                 . ' called while parsing (no title set)' );
2503                 }
2504
2505                 // Avoid PHP 7.1 warning from passing $this by reference
2506                 $parser = $this;
2507
2508                 /**
2509                  * Some of these require message or data lookups and can be
2510                  * expensive to check many times.
2511                  */
2512                 if ( Hooks::run( 'ParserGetVariableValueVarCache', [ &$parser, &$this->mVarCache ] ) ) {
2513                         if ( isset( $this->mVarCache[$index] ) ) {
2514                                 return $this->mVarCache[$index];
2515                         }
2516                 }
2517
2518                 $ts = wfTimestamp( TS_UNIX, $this->mOptions->getTimestamp() );
2519                 Hooks::run( 'ParserGetVariableValueTs', [ &$parser, &$ts ] );
2520
2521                 $pageLang = $this->getFunctionLang();
2522
2523                 switch ( $index ) {
2524                         case '!':
2525                                 $value = '|';
2526                                 break;
2527                         case 'currentmonth':
2528                                 $value = $pageLang->formatNum( MWTimestamp::getInstance( $ts )->format( 'm' ) );
2529                                 break;
2530                         case 'currentmonth1':
2531                                 $value = $pageLang->formatNum( MWTimestamp::getInstance( $ts )->format( 'n' ) );
2532                                 break;
2533                         case 'currentmonthname':
2534                                 $value = $pageLang->getMonthName( MWTimestamp::getInstance( $ts )->format( 'n' ) );
2535                                 break;
2536                         case 'currentmonthnamegen':
2537                                 $value = $pageLang->getMonthNameGen( MWTimestamp::getInstance( $ts )->format( 'n' ) );
2538                                 break;
2539                         case 'currentmonthabbrev':
2540                                 $value = $pageLang->getMonthAbbreviation( MWTimestamp::getInstance( $ts )->format( 'n' ) );
2541                                 break;
2542                         case 'currentday':
2543                                 $value = $pageLang->formatNum( MWTimestamp::getInstance( $ts )->format( 'j' ) );
2544                                 break;
2545                         case 'currentday2':
2546                                 $value = $pageLang->formatNum( MWTimestamp::getInstance( $ts )->format( 'd' ) );
2547                                 break;
2548                         case 'localmonth':
2549                                 $value = $pageLang->formatNum( MWTimestamp::getLocalInstance( $ts )->format( 'm' ) );
2550                                 break;
2551                         case 'localmonth1':
2552                                 $value = $pageLang->formatNum( MWTimestamp::getLocalInstance( $ts )->format( 'n' ) );
2553                                 break;
2554                         case 'localmonthname':
2555                                 $value = $pageLang->getMonthName( MWTimestamp::getLocalInstance( $ts )->format( 'n' ) );
2556                                 break;
2557                         case 'localmonthnamegen':
2558                                 $value = $pageLang->getMonthNameGen( MWTimestamp::getLocalInstance( $ts )->format( 'n' ) );
2559                                 break;
2560                         case 'localmonthabbrev':
2561                                 $value = $pageLang->getMonthAbbreviation( MWTimestamp::getLocalInstance( $ts )->format( 'n' ) );
2562                                 break;
2563                         case 'localday':
2564                                 $value = $pageLang->formatNum( MWTimestamp::getLocalInstance( $ts )->format( 'j' ) );
2565                                 break;
2566                         case 'localday2':
2567                                 $value = $pageLang->formatNum( MWTimestamp::getLocalInstance( $ts )->format( 'd' ) );
2568                                 break;
2569                         case 'pagename':
2570                                 $value = wfEscapeWikiText( $this->mTitle->getText() );
2571                                 break;
2572                         case 'pagenamee':
2573                                 $value = wfEscapeWikiText( $this->mTitle->getPartialURL() );
2574                                 break;
2575                         case 'fullpagename':
2576                                 $value = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2577                                 break;
2578                         case 'fullpagenamee':
2579                                 $value = wfEscapeWikiText( $this->mTitle->getPrefixedURL() );
2580                                 break;
2581                         case 'subpagename':
2582                                 $value = wfEscapeWikiText( $this->mTitle->getSubpageText() );
2583                                 break;
2584                         case 'subpagenamee':
2585                                 $value = wfEscapeWikiText( $this->mTitle->getSubpageUrlForm() );
2586                                 break;
2587                         case 'rootpagename':
2588                                 $value = wfEscapeWikiText( $this->mTitle->getRootText() );
2589                                 break;
2590                         case 'rootpagenamee':
2591                                 $value = wfEscapeWikiText( wfUrlencode( str_replace(
2592                                         ' ',
2593                                         '_',
2594                                         $this->mTitle->getRootText()
2595                                 ) ) );
2596                                 break;
2597                         case 'basepagename':
2598                                 $value = wfEscapeWikiText( $this->mTitle->getBaseText() );
2599                                 break;
2600                         case 'basepagenamee':
2601                                 $value = wfEscapeWikiText( wfUrlencode( str_replace(
2602                                         ' ',
2603                                         '_',
2604                                         $this->mTitle->getBaseText()
2605                                 ) ) );
2606                                 break;
2607                         case 'talkpagename':
2608                                 if ( $this->mTitle->canTalk() ) {
2609                                         $talkPage = $this->mTitle->getTalkPage();
2610                                         $value = wfEscapeWikiText( $talkPage->getPrefixedText() );
2611                                 } else {
2612                                         $value = '';
2613                                 }
2614                                 break;
2615                         case 'talkpagenamee':
2616                                 if ( $this->mTitle->canTalk() ) {
2617                                         $talkPage = $this->mTitle->getTalkPage();
2618                                         $value = wfEscapeWikiText( $talkPage->getPrefixedURL() );
2619                                 } else {
2620                                         $value = '';
2621                                 }
2622                                 break;
2623                         case 'subjectpagename':
2624                                 $subjPage = $this->mTitle->getSubjectPage();
2625                                 $value = wfEscapeWikiText( $subjPage->getPrefixedText() );
2626                                 break;
2627                         case 'subjectpagenamee':
2628                                 $subjPage = $this->mTitle->getSubjectPage();
2629                                 $value = wfEscapeWikiText( $subjPage->getPrefixedURL() );
2630                                 break;
2631                         case 'pageid': // requested in T25427
2632                                 $pageid = $this->getTitle()->getArticleID();
2633                                 if ( $pageid == 0 ) {
2634                                         # 0 means the page doesn't exist in the database,
2635                                         # which means the user is previewing a new page.
2636                                         # The vary-revision flag must be set, because the magic word
2637                                         # will have a different value once the page is saved.
2638                                         $this->mOutput->setFlag( 'vary-revision' );
2639                                         wfDebug( __METHOD__ . ": {{PAGEID}} used in a new page, setting vary-revision...\n" );
2640                                 }
2641                                 $value = $pageid ? $pageid : null;
2642                                 break;
2643                         case 'revisionid':
2644                                 # Let the edit saving system know we should parse the page
2645                                 # *after* a revision ID has been assigned.
2646                                 $this->mOutput->setFlag( 'vary-revision-id' );
2647                                 wfDebug( __METHOD__ . ": {{REVISIONID}} used, setting vary-revision-id...\n" );
2648                                 $value = $this->mRevisionId;
2649                                 if ( !$value && $this->mOptions->getSpeculativeRevIdCallback() ) {
2650                                         $value = call_user_func( $this->mOptions->getSpeculativeRevIdCallback() );
2651                                         $this->mOutput->setSpeculativeRevIdUsed( $value );
2652                                 }
2653                                 break;
2654                         case 'revisionday':
2655                                 # Let the edit saving system know we should parse the page
2656                                 # *after* a revision ID has been assigned. This is for null edits.
2657                                 $this->mOutput->setFlag( 'vary-revision' );
2658                                 wfDebug( __METHOD__ . ": {{REVISIONDAY}} used, setting vary-revision...\n" );
2659                                 $value = intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2660                                 break;
2661                         case 'revisionday2':
2662                                 # Let the edit saving system know we should parse the page
2663                                 # *after* a revision ID has been assigned. This is for null edits.
2664                                 $this->mOutput->setFlag( 'vary-revision' );
2665                                 wfDebug( __METHOD__ . ": {{REVISIONDAY2}} used, setting vary-revision...\n" );
2666                                 $value = substr( $this->getRevisionTimestamp(), 6, 2 );
2667                                 break;
2668                         case 'revisionmonth':
2669                                 # Let the edit saving system know we should parse the page
2670                                 # *after* a revision ID has been assigned. This is for null edits.
2671                                 $this->mOutput->setFlag( 'vary-revision' );
2672                                 wfDebug( __METHOD__ . ": {{REVISIONMONTH}} used, setting vary-revision...\n" );
2673                                 $value = substr( $this->getRevisionTimestamp(), 4, 2 );
2674                                 break;
2675                         case 'revisionmonth1':
2676                                 # Let the edit saving system know we should parse the page
2677                                 # *after* a revision ID has been assigned. This is for null edits.
2678                                 $this->mOutput->setFlag( 'vary-revision' );
2679                                 wfDebug( __METHOD__ . ": {{REVISIONMONTH1}} used, setting vary-revision...\n" );
2680                                 $value = intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2681                                 break;
2682                         case 'revisionyear':
2683                                 # Let the edit saving system know we should parse the page
2684                                 # *after* a revision ID has been assigned. This is for null edits.
2685                                 $this->mOutput->setFlag( 'vary-revision' );
2686                                 wfDebug( __METHOD__ . ": {{REVISIONYEAR}} used, setting vary-revision...\n" );
2687                                 $value = substr( $this->getRevisionTimestamp(), 0, 4 );
2688                                 break;
2689                         case 'revisiontimestamp':
2690                                 # Let the edit saving system know we should parse the page
2691                                 # *after* a revision ID has been assigned. This is for null edits.
2692                                 $this->mOutput->setFlag( 'vary-revision' );
2693                                 wfDebug( __METHOD__ . ": {{REVISIONTIMESTAMP}} used, setting vary-revision...\n" );
2694                                 $value = $this->getRevisionTimestamp();
2695                                 break;
2696                         case 'revisionuser':
2697                                 # Let the edit saving system know we should parse the page
2698                                 # *after* a revision ID has been assigned for null edits.
2699                                 $this->mOutput->setFlag( 'vary-user' );
2700                                 wfDebug( __METHOD__ . ": {{REVISIONUSER}} used, setting vary-user...\n" );
2701                                 $value = $this->getRevisionUser();
2702                                 break;
2703                         case 'revisionsize':
2704                                 $value = $this->getRevisionSize();
2705                                 break;
2706                         case 'namespace':
2707                                 $value = str_replace( '_', ' ', $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2708                                 break;
2709                         case 'namespacee':
2710                                 $value = wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2711                                 break;
2712                         case 'namespacenumber':
2713                                 $value = $this->mTitle->getNamespace();
2714                                 break;
2715                         case 'talkspace':
2716                                 $value = $this->mTitle->canTalk()
2717                                         ? str_replace( '_', ' ', $this->mTitle->getTalkNsText() )
2718                                         : '';
2719                                 break;
2720                         case 'talkspacee':
2721                                 $value = $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2722                                 break;
2723                         case 'subjectspace':
2724                                 $value = str_replace( '_', ' ', $this->mTitle->getSubjectNsText() );
2725                                 break;
2726                         case 'subjectspacee':
2727                                 $value = ( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2728                                 break;
2729                         case 'currentdayname':
2730                                 $value = $pageLang->getWeekdayName( (int)MWTimestamp::getInstance( $ts )->format( 'w' ) + 1 );
2731                                 break;
2732                         case 'currentyear':
2733                                 $value = $pageLang->formatNum( MWTimestamp::getInstance( $ts )->format( 'Y' ), true );
2734                                 break;
2735                         case 'currenttime':
2736                                 $value = $pageLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2737                                 break;
2738                         case 'currenthour':
2739                                 $value = $pageLang->formatNum( MWTimestamp::getInstance( $ts )->format( 'H' ), true );
2740                                 break;
2741                         case 'currentweek':
2742                                 # @bug T6594 PHP5 has it zero padded, PHP4 does not, cast to
2743                                 # int to remove the padding
2744                                 $value = $pageLang->formatNum( (int)MWTimestamp::getInstance( $ts )->format( 'W' ) );
2745                                 break;
2746                         case 'currentdow':
2747                                 $value = $pageLang->formatNum( MWTimestamp::getInstance( $ts )->format( 'w' ) );
2748                                 break;
2749                         case 'localdayname':
2750                                 $value = $pageLang->getWeekdayName(
2751                                         (int)MWTimestamp::getLocalInstance( $ts )->format( 'w' ) + 1
2752                                 );
2753                                 break;
2754                         case 'localyear':
2755                                 $value = $pageLang->formatNum( MWTimestamp::getLocalInstance( $ts )->format( 'Y' ), true );
2756                                 break;
2757                         case 'localtime':
2758                                 $value = $pageLang->time(
2759                                         MWTimestamp::getLocalInstance( $ts )->format( 'YmdHis' ),
2760                                         false,
2761                                         false
2762                                 );
2763                                 break;
2764                         case 'localhour':
2765                                 $value = $pageLang->formatNum( MWTimestamp::getLocalInstance( $ts )->format( 'H' ), true );
2766                                 break;
2767                         case 'localweek':
2768                                 # @bug T6594 PHP5 has it zero padded, PHP4 does not, cast to
2769                                 # int to remove the padding
2770                                 $value = $pageLang->formatNum( (int)MWTimestamp::getLocalInstance( $ts )->format( 'W' ) );
2771                                 break;
2772                         case 'localdow':
2773                                 $value = $pageLang->formatNum( MWTimestamp::getLocalInstance( $ts )->format( 'w' ) );
2774                                 break;
2775                         case 'numberofarticles':
2776                                 $value = $pageLang->formatNum( SiteStats::articles() );
2777                                 break;
2778                         case 'numberoffiles':
2779                                 $value = $pageLang->formatNum( SiteStats::images() );
2780                                 break;
2781                         case 'numberofusers':
2782                                 $value = $pageLang->formatNum( SiteStats::users() );
2783                                 break;
2784                         case 'numberofactiveusers':
2785                                 $value = $pageLang->formatNum( SiteStats::activeUsers() );
2786                                 break;
2787                         case 'numberofpages':
2788                                 $value = $pageLang->formatNum( SiteStats::pages() );
2789                                 break;
2790                         case 'numberofadmins':
2791                                 $value = $pageLang->formatNum( SiteStats::numberingroup( 'sysop' ) );
2792                                 break;
2793                         case 'numberofedits':
2794                                 $value = $pageLang->formatNum( SiteStats::edits() );
2795                                 break;
2796                         case 'currenttimestamp':
2797                                 $value = wfTimestamp( TS_MW, $ts );
2798                                 break;
2799                         case 'localtimestamp':
2800                                 $value = MWTimestamp::getLocalInstance( $ts )->format( 'YmdHis' );
2801                                 break;
2802                         case 'currentversion':
2803                                 $value = SpecialVersion::getVersion();
2804                                 break;
2805                         case 'articlepath':
2806                                 return $wgArticlePath;
2807                         case 'sitename':
2808                                 return $wgSitename;
2809                         case 'server':
2810                                 return $wgServer;
2811                         case 'servername':
2812                                 return $wgServerName;
2813                         case 'scriptpath':
2814                                 return $wgScriptPath;
2815                         case 'stylepath':
2816                                 return $wgStylePath;
2817                         case 'directionmark':
2818                                 return $pageLang->getDirMark();
2819                         case 'contentlanguage':
2820                                 global $wgLanguageCode;
2821                                 return $wgLanguageCode;
2822                         case 'pagelanguage':
2823                                 $value = $pageLang->getCode();
2824                                 break;
2825                         case 'cascadingsources':
2826                                 $value = CoreParserFunctions::cascadingsources( $this );
2827                                 break;
2828                         default:
2829                                 $ret = null;
2830                                 Hooks::run(
2831                                         'ParserGetVariableValueSwitch',
2832                                         [ &$parser, &$this->mVarCache, &$index, &$ret, &$frame ]
2833                                 );
2834
2835                                 return $ret;
2836                 }
2837
2838                 if ( $index ) {
2839                         $this->mVarCache[$index] = $value;
2840                 }
2841
2842                 return $value;
2843         }
2844
2845         /**
2846          * initialise the magic variables (like CURRENTMONTHNAME) and substitution modifiers
2847          *
2848          * @private
2849          */
2850         public function initialiseVariables() {
2851                 $variableIDs = MagicWord::getVariableIDs();
2852                 $substIDs = MagicWord::getSubstIDs();
2853
2854                 $this->mVariables = new MagicWordArray( $variableIDs );
2855                 $this->mSubstWords = new MagicWordArray( $substIDs );
2856         }
2857
2858         /**
2859          * Preprocess some wikitext and return the document tree.
2860          * This is the ghost of replace_variables().
2861          *
2862          * @param string $text The text to parse
2863          * @param int $flags Bitwise combination of:
2864          *   - self::PTD_FOR_INCLUSION: Handle "<noinclude>" and "<includeonly>" as if the text is being
2865          *     included. Default is to assume a direct page view.
2866          *
2867          * The generated DOM tree must depend only on the input text and the flags.
2868          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of T6899.
2869          *
2870          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
2871          * change in the DOM tree for a given text, must be passed through the section identifier
2872          * in the section edit link and thus back to extractSections().
2873          *
2874          * The output of this function is currently only cached in process memory, but a persistent
2875          * cache may be implemented at a later date which takes further advantage of these strict
2876          * dependency requirements.
2877          *
2878          * @return PPNode
2879          */
2880         public function preprocessToDom( $text, $flags = 0 ) {
2881                 $dom = $this->getPreprocessor()->preprocessToObj( $text, $flags );
2882                 return $dom;
2883         }
2884
2885         /**
2886          * Return a three-element array: leading whitespace, string contents, trailing whitespace
2887          *
2888          * @param string $s
2889          *
2890          * @return array
2891          */
2892         public static function splitWhitespace( $s ) {
2893                 $ltrimmed = ltrim( $s );
2894                 $w1 = substr( $s, 0, strlen( $s ) - strlen( $ltrimmed ) );
2895                 $trimmed = rtrim( $ltrimmed );
2896                 $diff = strlen( $ltrimmed ) - strlen( $trimmed );
2897                 if ( $diff > 0 ) {
2898                         $w2 = substr( $ltrimmed, -$diff );
2899                 } else {
2900                         $w2 = '';
2901                 }
2902                 return [ $w1, $trimmed, $w2 ];
2903         }
2904
2905         /**
2906          * Replace magic variables, templates, and template arguments
2907          * with the appropriate text. Templates are substituted recursively,
2908          * taking care to avoid infinite loops.
2909          *
2910          * Note that the substitution depends on value of $mOutputType:
2911          *  self::OT_WIKI: only {{subst:}} templates
2912          *  self::OT_PREPROCESS: templates but not extension tags
2913          *  self::OT_HTML: all templates and extension tags
2914          *
2915          * @param string $text The text to transform
2916          * @param bool|PPFrame $frame Object describing the arguments passed to the
2917          *   template. Arguments may also be provided as an associative array, as
2918          *   was the usual case before MW1.12. Providing arguments this way may be
2919          *   useful for extensions wishing to perform variable replacement
2920          *   explicitly.
2921          * @param bool $argsOnly Only do argument (triple-brace) expansion, not
2922          *   double-brace expansion.
2923          * @return string
2924          */
2925         public function replaceVariables( $text, $frame = false, $argsOnly = false ) {
2926                 # Is there any text? Also, Prevent too big inclusions!
2927                 $textSize = strlen( $text );
2928                 if ( $textSize < 1 || $textSize > $this->mOptions->getMaxIncludeSize() ) {
2929                         return $text;
2930                 }
2931
2932                 if ( $frame === false ) {
2933                         $frame = $this->getPreprocessor()->newFrame();
2934                 } elseif ( !( $frame instanceof PPFrame ) ) {
2935                         wfDebug( __METHOD__ . " called using plain parameters instead of "
2936                                 . "a PPFrame instance. Creating custom frame.\n" );
2937                         $frame = $this->getPreprocessor()->newCustomFrame( $frame );
2938                 }
2939
2940                 $dom = $this->preprocessToDom( $text );
2941                 $flags = $argsOnly ? PPFrame::NO_TEMPLATES : 0;
2942                 $text = $frame->expand( $dom, $flags );
2943
2944                 return $text;
2945         }
2946
2947         /**
2948          * Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2949          *
2950          * @param array $args
2951          *
2952          * @return array
2953          */
2954         public static function createAssocArgs( $args ) {
2955                 $assocArgs = [];
2956                 $index = 1;
2957                 foreach ( $args as $arg ) {
2958                         $eqpos = strpos( $arg, '=' );
2959                         if ( $eqpos === false ) {
2960                                 $assocArgs[$index++] = $arg;
2961                         } else {
2962                                 $name = trim( substr( $arg, 0, $eqpos ) );
2963                                 $value = trim( substr( $arg, $eqpos + 1 ) );
2964                                 if ( $value === false ) {
2965                                         $value = '';
2966                                 }
2967                                 if ( $name !== false ) {
2968                                         $assocArgs[$name] = $value;
2969                                 }
2970                         }
2971                 }
2972
2973                 return $assocArgs;
2974         }
2975
2976         /**
2977          * Warn the user when a parser limitation is reached
2978          * Will warn at most once the user per limitation type
2979          *
2980          * The results are shown during preview and run through the Parser (See EditPage.php)
2981          *
2982          * @param string $limitationType Should be one of:
2983          *   'expensive-parserfunction' (corresponding messages:
2984          *       'expensive-parserfunction-warning',
2985          *       'expensive-parserfunction-category')
2986          *   'post-expand-template-argument' (corresponding messages:
2987          *       'post-expand-template-argument-warning',
2988          *       'post-expand-template-argument-category')
2989          *   'post-expand-template-inclusion' (corresponding messages:
2990          *       'post-expand-template-inclusion-warning',
2991          *       'post-expand-template-inclusion-category')
2992          *   'node-count-exceeded' (corresponding messages:
2993          *       'node-count-exceeded-warning',
2994          *       'node-count-exceeded-category')
2995          *   'expansion-depth-exceeded' (corresponding messages:
2996          *       'expansion-depth-exceeded-warning',
2997          *       'expansion-depth-exceeded-category')
2998          * @param string|int|null $current Current value
2999          * @param string|int|null $max Maximum allowed, when an explicit limit has been
3000          *       exceeded, provide the values (optional)
3001          */
3002         public function limitationWarn( $limitationType, $current = '', $max = '' ) {
3003                 # does no harm if $current and $max are present but are unnecessary for the message
3004                 # Not doing ->inLanguage( $this->mOptions->getUserLangObj() ), since this is shown
3005                 # only during preview, and that would split the parser cache unnecessarily.
3006                 $warning = wfMessage( "$limitationType-warning" )->numParams( $current, $max )
3007                         ->text();
3008                 $this->mOutput->addWarning( $warning );
3009                 $this->addTrackingCategory( "$limitationType-category" );
3010         }
3011
3012         /**
3013          * Return the text of a template, after recursively
3014          * replacing any variables or templates within the template.
3015          *
3016          * @param array $piece The parts of the template
3017          *   $piece['title']: the title, i.e. the part before the |
3018          *   $piece['parts']: the parameter array
3019          *   $piece['lineStart']: whether the brace was at the start of a line
3020          * @param PPFrame $frame The current frame, contains template arguments
3021          * @throws Exception
3022          * @return string The text of the template
3023          */
3024         public function braceSubstitution( $piece, $frame ) {
3025
3026                 // Flags
3027
3028                 // $text has been filled
3029                 $found = false;
3030                 // wiki markup in $text should be escaped
3031                 $nowiki = false;
3032                 // $text is HTML, armour it against wikitext transformation
3033                 $isHTML = false;
3034                 // Force interwiki transclusion to be done in raw mode not rendered
3035                 $forceRawInterwiki = false;
3036                 // $text is a DOM node needing expansion in a child frame
3037                 $isChildObj = false;
3038                 // $text is a DOM node needing expansion in the current frame
3039                 $isLocalObj = false;
3040
3041                 # Title object, where $text came from
3042                 $title = false;
3043
3044                 # $part1 is the bit before the first |, and must contain only title characters.
3045                 # Various prefixes will be stripped from it later.
3046                 $titleWithSpaces = $frame->expand( $piece['title'] );
3047                 $part1 = trim( $titleWithSpaces );
3048                 $titleText = false;
3049
3050                 # Original title text preserved for various purposes
3051                 $originalTitle = $part1;
3052
3053                 # $args is a list of argument nodes, starting from index 0, not including $part1
3054                 # @todo FIXME: If piece['parts'] is null then the call to getLength()
3055                 # below won't work b/c this $args isn't an object
3056                 $args = ( null == $piece['parts'] ) ? [] : $piece['parts'];
3057
3058                 $profileSection = null; // profile templates
3059
3060                 # SUBST
3061                 if ( !$found ) {
3062                         $substMatch = $this->mSubstWords->matchStartAndRemove( $part1 );
3063
3064                         # Possibilities for substMatch: "subst", "safesubst" or FALSE
3065                         # Decide whether to expand template or keep wikitext as-is.
3066                         if ( $this->ot['wiki'] ) {
3067                                 if ( $substMatch === false ) {
3068                                         $literal = true;  # literal when in PST with no prefix
3069                                 } else {
3070                                         $literal = false; # expand when in PST with subst: or safesubst:
3071                                 }
3072                         } else {
3073                                 if ( $substMatch == 'subst' ) {
3074                                         $literal = true;  # literal when not in PST with plain subst:
3075                                 } else {
3076                                         $literal = false; # expand when not in PST with safesubst: or no prefix
3077                                 }
3078                         }
3079                         if ( $literal ) {
3080                                 $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
3081                                 $isLocalObj = true;
3082                                 $found = true;
3083                         }
3084                 }
3085
3086                 # Variables
3087                 if ( !$found && $args->getLength() == 0 ) {
3088                         $id = $this->mVariables->matchStartToEnd( $part1 );
3089                         if ( $id !== false ) {
3090                                 $text = $this->getVariableValue( $id, $frame );
3091                                 if ( MagicWord::getCacheTTL( $id ) > -1 ) {
3092                                         $this->mOutput->updateCacheExpiry( MagicWord::getCacheTTL( $id ) );
3093                                 }
3094                                 $found = true;
3095                         }
3096                 }
3097
3098                 # MSG, MSGNW and RAW
3099                 if ( !$found ) {
3100                         # Check for MSGNW:
3101                         $mwMsgnw = MagicWord::get( 'msgnw' );
3102                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
3103                                 $nowiki = true;
3104                         } else {
3105                                 # Remove obsolete MSG:
3106                                 $mwMsg = MagicWord::get( 'msg' );
3107                                 $mwMsg->matchStartAndRemove( $part1 );
3108                         }
3109
3110                         # Check for RAW:
3111                         $mwRaw = MagicWord::get( 'raw' );
3112                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
3113                                 $forceRawInterwiki = true;
3114                         }
3115                 }
3116
3117                 # Parser functions
3118                 if ( !$found ) {
3119                         $colonPos = strpos( $part1, ':' );
3120                         if ( $colonPos !== false ) {
3121                                 $func = substr( $part1, 0, $colonPos );
3122                                 $funcArgs = [ trim( substr( $part1, $colonPos + 1 ) ) ];
3123                                 $argsLength = $args->getLength();
3124                                 for ( $i = 0; $i < $argsLength; $i++ ) {
3125                                         $funcArgs[] = $args->item( $i );
3126                                 }
3127                                 try {
3128                                         $result = $this->callParserFunction( $frame, $func, $funcArgs );
3129                                 } catch ( Exception $ex ) {
3130                                         throw $ex;
3131                                 }
3132
3133                                 # The interface for parser functions allows for extracting
3134                                 # flags into the local scope. Extract any forwarded flags
3135                                 # here.
3136                                 extract( $result );
3137                         }
3138                 }
3139
3140                 # Finish mangling title and then check for loops.
3141                 # Set $title to a Title object and $titleText to the PDBK
3142                 if ( !$found ) {
3143                         $ns = NS_TEMPLATE;
3144                         # Split the title into page and subpage
3145                         $subpage = '';
3146                         $relative = $this->maybeDoSubpageLink( $part1, $subpage );
3147                         if ( $part1 !== $relative ) {
3148                                 $part1 = $relative;
3149                                 $ns = $this->mTitle->getNamespace();
3150                         }
3151                         $title = Title::newFromText( $part1, $ns );
3152                         if ( $title ) {
3153                                 $titleText = $title->getPrefixedText();
3154                                 # Check for language variants if the template is not found
3155                                 if ( $this->getConverterLanguage()->hasVariants() && $title->getArticleID() == 0 ) {
3156                                         $this->getConverterLanguage()->findVariantLink( $part1, $title, true );
3157                                 }
3158                                 # Do recursion depth check
3159                                 $limit = $this->mOptions->getMaxTemplateDepth();
3160                                 if ( $frame->depth >= $limit ) {
3161                                         $found = true;
3162                                         $text = '<span class="error">'
3163                                                 . wfMessage( 'parser-template-recursion-depth-warning' )
3164                                                         ->numParams( $limit )->inContentLanguage()->text()
3165                                                 . '</span>';
3166                                 }
3167                         }
3168                 }
3169
3170                 # Load from database
3171                 if ( !$found && $title ) {
3172                         $profileSection = $this->mProfiler->scopedProfileIn( $title->getPrefixedDBkey() );
3173                         if ( !$title->isExternal() ) {
3174                                 if ( $title->isSpecialPage()
3175                                         && $this->mOptions->getAllowSpecialInclusion()
3176                                         && $this->ot['html']
3177                                 ) {
3178                                         $specialPage = SpecialPageFactory::getPage( $title->getDBkey() );
3179                                         // Pass the template arguments as URL parameters.
3180                                         // "uselang" will have no effect since the Language object
3181                                         // is forced to the one defined in ParserOptions.
3182                                         $pageArgs = [];
3183                                         $argsLength = $args->getLength();
3184                                         for ( $i = 0; $i < $argsLength; $i++ ) {
3185                                                 $bits = $args->item( $i )->splitArg();
3186                                                 if ( strval( $bits['index'] ) === '' ) {
3187                                                         $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
3188                                                         $value = trim( $frame->expand( $bits['value'] ) );
3189                                                         $pageArgs[$name] = $value;
3190                                                 }
3191                                         }
3192
3193                                         // Create a new context to execute the special page
3194                                         $context = new RequestContext;
3195                                         $context->setTitle( $title );
3196                                         $context->setRequest( new FauxRequest( $pageArgs ) );
3197                                         if ( $specialPage && $specialPage->maxIncludeCacheTime() === 0 ) {
3198                                                 $context->setUser( $this->getUser() );
3199                                         } else {
3200                                                 // If this page is cached, then we better not be per user.
3201                                                 $context->setUser( User::newFromName( '127.0.0.1', false ) );
3202                                         }
3203                                         $context->setLanguage( $this->mOptions->getUserLangObj() );
3204                                         $ret = SpecialPageFactory::capturePath(
3205                                                 $title, $context, $this->getLinkRenderer() );
3206                                         if ( $ret ) {
3207                                                 $text = $context->getOutput()->getHTML();
3208                                                 $this->mOutput->addOutputPageMetadata( $context->getOutput() );
3209                                                 $found = true;
3210                                                 $isHTML = true;
3211                                                 if ( $specialPage && $specialPage->maxIncludeCacheTime() !== false ) {
3212                                                         $this->mOutput->updateRuntimeAdaptiveExpiry(
3213                                                                 $specialPage->maxIncludeCacheTime()
3214                                                         );
3215                                                 }
3216                                         }
3217                                 } elseif ( MWNamespace::isNonincludable( $title->getNamespace() ) ) {
3218                                         $found = false; # access denied
3219                                         wfDebug( __METHOD__ . ": template inclusion denied for " .
3220                                                 $title->getPrefixedDBkey() . "\n" );
3221                                 } else {
3222                                         list( $text, $title ) = $this->getTemplateDom( $title );
3223                                         if ( $text !== false ) {
3224                                                 $found = true;
3225                                                 $isChildObj = true;
3226                                         }
3227                                 }
3228
3229                                 # If the title is valid but undisplayable, make a link to it
3230                                 if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3231                                         $text = "[[:$titleText]]";
3232                                         $found = true;
3233                                 }
3234                         } elseif ( $title->isTrans() ) {
3235                                 # Interwiki transclusion
3236                                 if ( $this->ot['html'] && !$forceRawInterwiki ) {
3237                                         $text = $this->interwikiTransclude( $title, 'render' );
3238                                         $isHTML = true;
3239                                 } else {
3240                                         $text = $this->interwikiTransclude( $title, 'raw' );
3241                                         # Preprocess it like a template
3242                                         $text = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3243                                         $isChildObj = true;
3244                                 }
3245                                 $found = true;
3246                         }
3247
3248                         # Do infinite loop check
3249                         # This has to be done after redirect resolution to avoid infinite loops via redirects
3250                         if ( !$frame->loopCheck( $title ) ) {
3251                                 $found = true;
3252                                 $text = '<span class="error">'
3253                                         . wfMessage( 'parser-template-loop-warning', $titleText )->inContentLanguage()->text()
3254                                         . '</span>';
3255                                 wfDebug( __METHOD__ . ": template loop broken at '$titleText'\n" );
3256                         }
3257                 }
3258
3259                 # If we haven't found text to substitute by now, we're done
3260                 # Recover the source wikitext and return it
3261                 if ( !$found ) {
3262                         $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
3263                         if ( $profileSection ) {
3264                                 $this->mProfiler->scopedProfileOut( $profileSection );
3265                         }
3266                         return [ 'object' => $text ];
3267                 }
3268
3269                 # Expand DOM-style return values in a child frame
3270                 if ( $isChildObj ) {
3271                         # Clean up argument array
3272                         $newFrame = $frame->newChild( $args, $title );
3273
3274                         if ( $nowiki ) {
3275                                 $text = $newFrame->expand( $text, PPFrame::RECOVER_ORIG );
3276                         } elseif ( $titleText !== false && $newFrame->isEmpty() ) {
3277                                 # Expansion is eligible for the empty-frame cache
3278                                 $text = $newFrame->cachedExpand( $titleText, $text );
3279                         } else {
3280                                 # Uncached expansion
3281                                 $text = $newFrame->expand( $text );
3282                         }
3283                 }
3284                 if ( $isLocalObj && $nowiki ) {
3285                         $text = $frame->expand( $text, PPFrame::RECOVER_ORIG );
3286                         $isLocalObj = false;
3287                 }
3288
3289                 if ( $profileSection ) {
3290                         $this->mProfiler->scopedProfileOut( $profileSection );
3291                 }
3292
3293                 # Replace raw HTML by a placeholder
3294                 if ( $isHTML ) {
3295                         $text = $this->insertStripItem( $text );
3296                 } elseif ( $nowiki && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3297                         # Escape nowiki-style return values
3298                         $text = wfEscapeWikiText( $text );
3299                 } elseif ( is_string( $text )
3300                         && !$piece['lineStart']
3301                         && preg_match( '/^(?:{\\||:|;|#|\*)/', $text )
3302                 ) {
3303                         # T2529: if the template begins with a table or block-level
3304                         # element, it should be treated as beginning a new line.
3305                         # This behavior is somewhat controversial.
3306                         $text = "\n" . $text;
3307                 }
3308
3309                 if ( is_string( $text ) && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3310                         # Error, oversize inclusion
3311                         if ( $titleText !== false ) {
3312                                 # Make a working, properly escaped link if possible (T25588)
3313                                 $text = "[[:$titleText]]";
3314                         } else {
3315                                 # This will probably not be a working link, but at least it may
3316                                 # provide some hint of where the problem is
3317                                 preg_replace( '/^:/', '', $originalTitle );
3318                                 $text = "[[:$originalTitle]]";
3319                         }
3320                         $text .= $this->insertStripItem( '<!-- WARNING: template omitted, '
3321                                 . 'post-expand include size too large -->' );
3322                         $this->limitationWarn( 'post-expand-template-inclusion' );
3323                 }
3324
3325                 if ( $isLocalObj ) {
3326                         $ret = [ 'object' => $text ];
3327                 } else {
3328                         $ret = [ 'text' => $text ];
3329                 }
3330
3331                 return $ret;
3332         }
3333
3334         /**
3335          * Call a parser function and return an array with text and flags.
3336          *
3337          * The returned array will always contain a boolean 'found', indicating
3338          * whether the parser function was found or not. It may also contain the
3339          * following:
3340          *  text: string|object, resulting wikitext or PP DOM object
3341          *  isHTML: bool, $text is HTML, armour it against wikitext transformation
3342          *  isChildObj: bool, $text is a DOM node needing expansion in a child frame
3343          *  isLocalObj: bool, $text is a DOM node needing expansion in the current frame
3344          *  nowiki: bool, wiki markup in $text should be escaped
3345          *
3346          * @since 1.21
3347          * @param PPFrame $frame The current frame, contains template arguments
3348          * @param string $function Function name
3349          * @param array $args Arguments to the function
3350          * @throws MWException
3351          * @return array
3352          */
3353         public function callParserFunction( $frame, $function, array $args = [] ) {
3354                 global $wgContLang;
3355
3356                 # Case sensitive functions
3357                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
3358                         $function = $this->mFunctionSynonyms[1][$function];
3359                 } else {
3360                         # Case insensitive functions
3361                         $function = $wgContLang->lc( $function );
3362                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
3363                                 $function = $this->mFunctionSynonyms[0][$function];
3364                         } else {
3365                                 return [ 'found' => false ];
3366                         }
3367                 }
3368
3369                 list( $callback, $flags ) = $this->mFunctionHooks[$function];
3370
3371                 # Workaround for PHP bug 35229 and similar
3372                 if ( !is_callable( $callback ) ) {
3373                         throw new MWException( "Tag hook for $function is not callable\n" );
3374                 }
3375
3376                 // Avoid PHP 7.1 warning from passing $this by reference
3377                 $parser = $this;
3378
3379                 $allArgs = [ &$parser ];
3380                 if ( $flags & self::SFH_OBJECT_ARGS ) {
3381                         # Convert arguments to PPNodes and collect for appending to $allArgs
3382                         $funcArgs = [];
3383                         foreach ( $args as $k => $v ) {
3384                                 if ( $v instanceof PPNode || $k === 0 ) {
3385                                         $funcArgs[] = $v;
3386                                 } else {
3387                                         $funcArgs[] = $this->mPreprocessor->newPartNodeArray( [ $k => $v ] )->item( 0 );
3388                                 }
3389                         }
3390
3391                         # Add a frame parameter, and pass the arguments as an array
3392                         $allArgs[] = $frame;
3393                         $allArgs[] = $funcArgs;
3394                 } else {
3395                         # Convert arguments to plain text and append to $allArgs
3396                         foreach ( $args as $k => $v ) {
3397                                 if ( $v instanceof PPNode ) {
3398                                         $allArgs[] = trim( $frame->expand( $v ) );
3399                                 } elseif ( is_int( $k ) && $k >= 0 ) {
3400                                         $allArgs[] = trim( $v );
3401                                 } else {
3402                                         $allArgs[] = trim( "$k=$v" );
3403                                 }
3404                         }
3405                 }
3406
3407                 $result = call_user_func_array( $callback, $allArgs );
3408
3409                 # The interface for function hooks allows them to return a wikitext
3410                 # string or an array containing the string and any flags. This mungs
3411                 # things around to match what this method should return.
3412                 if ( !is_array( $result ) ) {
3413                         $result =[
3414                                 'found' => true,
3415                                 'text' => $result,
3416                         ];
3417                 } else {
3418                         if ( isset( $result[0] ) && !isset( $result['text'] ) ) {
3419                                 $result['text'] = $result[0];
3420                         }
3421                         unset( $result[0] );
3422                         $result += [
3423                                 'found' => true,
3424                         ];
3425                 }
3426
3427                 $noparse = true;
3428                 $preprocessFlags = 0;
3429                 if ( isset( $result['noparse'] ) ) {
3430                         $noparse = $result['noparse'];
3431                 }
3432                 if ( isset( $result['preprocessFlags'] ) ) {
3433                         $preprocessFlags = $result['preprocessFlags'];
3434                 }
3435
3436                 if ( !$noparse ) {
3437                         $result['text'] = $this->preprocessToDom( $result['text'], $preprocessFlags );
3438                         $result['isChildObj'] = true;
3439                 }
3440
3441                 return $result;
3442         }
3443
3444         /**
3445          * Get the semi-parsed DOM representation of a template with a given title,
3446          * and its redirect destination title. Cached.
3447          *
3448          * @param Title $title
3449          *
3450          * @return array
3451          */
3452         public function getTemplateDom( $title ) {
3453                 $cacheTitle = $title;
3454                 $titleText = $title->getPrefixedDBkey();
3455
3456                 if ( isset( $this->mTplRedirCache[$titleText] ) ) {
3457                         list( $ns, $dbk ) = $this->mTplRedirCache[$titleText];
3458                         $title = Title::makeTitle( $ns, $dbk );
3459                         $titleText = $title->getPrefixedDBkey();
3460                 }
3461                 if ( isset( $this->mTplDomCache[$titleText] ) ) {
3462                         return [ $this->mTplDomCache[$titleText], $title ];
3463                 }
3464
3465                 # Cache miss, go to the database
3466                 list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
3467
3468                 if ( $text === false ) {
3469                         $this->mTplDomCache[$titleText] = false;
3470                         return [ false, $title ];
3471                 }
3472
3473                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3474                 $this->mTplDomCache[$titleText] = $dom;
3475
3476                 if ( !$title->equals( $cacheTitle ) ) {
3477                         $this->mTplRedirCache[$cacheTitle->getPrefixedDBkey()] =
3478                                 [ $title->getNamespace(), $cdb = $title->getDBkey() ];
3479                 }
3480
3481                 return [ $dom, $title ];
3482         }
3483
3484         /**
3485          * Fetch the current revision of a given title. Note that the revision
3486          * (and even the title) may not exist in the database, so everything
3487          * contributing to the output of the parser should use this method
3488          * where possible, rather than getting the revisions themselves. This
3489          * method also caches its results, so using it benefits performance.
3490          *
3491          * @since 1.24
3492          * @param Title $title
3493          * @return Revision
3494          */
3495         public function fetchCurrentRevisionOfTitle( $title ) {
3496                 $cacheKey = $title->getPrefixedDBkey();
3497                 if ( !$this->currentRevisionCache ) {
3498                         $this->currentRevisionCache = new MapCacheLRU( 100 );
3499                 }
3500                 if ( !$this->currentRevisionCache->has( $cacheKey ) ) {
3501                         $this->currentRevisionCache->set( $cacheKey,
3502                                 // Defaults to Parser::statelessFetchRevision()
3503                                 call_user_func( $this->mOptions->getCurrentRevisionCallback(), $title, $this )
3504                         );
3505                 }
3506                 return $this->currentRevisionCache->get( $cacheKey );
3507         }
3508
3509         /**
3510          * Wrapper around Revision::newFromTitle to allow passing additional parameters
3511          * without passing them on to it.
3512          *
3513          * @since 1.24
3514          * @param Title $title
3515          * @param Parser|bool $parser
3516          * @return Revision|bool False if missing
3517          */
3518         public static function statelessFetchRevision( Title $title, $parser = false ) {
3519                 $pageId = $title->getArticleID();
3520                 $revId = $title->getLatestRevID();
3521
3522                 $rev = Revision::newKnownCurrent( wfGetDB( DB_REPLICA ), $pageId, $revId );
3523                 if ( $rev ) {
3524                         $rev->setTitle( $title );
3525                 }
3526
3527                 return $rev;
3528         }
3529
3530         /**
3531          * Fetch the unparsed text of a template and register a reference to it.
3532          * @param Title $title
3533          * @return array ( string or false, Title )
3534          */
3535         public function fetchTemplateAndTitle( $title ) {
3536                 // Defaults to Parser::statelessFetchTemplate()
3537                 $templateCb = $this->mOptions->getTemplateCallback();
3538                 $stuff = call_user_func( $templateCb, $title, $this );
3539                 // We use U+007F DELETE to distinguish strip markers from regular text.
3540                 $text = $stuff['text'];
3541                 if ( is_string( $stuff['text'] ) ) {
3542                         $text = strtr( $text, "\x7f", "?" );
3543                 }
3544                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3545                 if ( isset( $stuff['deps'] ) ) {
3546                         foreach ( $stuff['deps'] as $dep ) {
3547                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3548                                 if ( $dep['title']->equals( $this->getTitle() ) ) {
3549                                         // If we transclude ourselves, the final result
3550                                         // will change based on the new version of the page
3551                                         $this->mOutput->setFlag( 'vary-revision' );
3552                                 }
3553                         }
3554                 }
3555                 return [ $text, $finalTitle ];
3556         }
3557
3558         /**
3559          * Fetch the unparsed text of a template and register a reference to it.
3560          * @param Title $title
3561          * @return string|bool
3562          */
3563         public function fetchTemplate( $title ) {
3564                 return $this->fetchTemplateAndTitle( $title )[0];
3565         }
3566
3567         /**
3568          * Static function to get a template
3569          * Can be overridden via ParserOptions::setTemplateCallback().
3570          *
3571          * @param Title $title
3572          * @param bool|Parser $parser
3573          *
3574          * @return array
3575          */
3576         public static function statelessFetchTemplate( $title, $parser = false ) {
3577                 $text = $skip = false;
3578                 $finalTitle = $title;
3579                 $deps = [];
3580
3581                 # Loop to fetch the article, with up to 1 redirect
3582                 // @codingStandardsIgnoreStart Generic.CodeAnalysis.ForLoopWithTestFunctionCall.NotAllowed
3583                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3584                         // @codingStandardsIgnoreEnd
3585                         # Give extensions a chance to select the revision instead
3586                         $id = false; # Assume current
3587                         Hooks::run( 'BeforeParserFetchTemplateAndtitle',
3588                                 [ $parser, $title, &$skip, &$id ] );
3589
3590                         if ( $skip ) {
3591                                 $text = false;
3592                                 $deps[] = [
3593                                         'title' => $title,
3594                                         'page_id' => $title->getArticleID(),
3595                                         'rev_id' => null
3596                                 ];
3597                                 break;
3598                         }
3599                         # Get the revision
3600                         if ( $id ) {
3601                                 $rev = Revision::newFromId( $id );
3602                         } elseif ( $parser ) {
3603                                 $rev = $parser->fetchCurrentRevisionOfTitle( $title );
3604                         } else {
3605                                 $rev = Revision::newFromTitle( $title );
3606                         }
3607                         $rev_id = $rev ? $rev->getId() : 0;
3608                         # If there is no current revision, there is no page
3609                         if ( $id === false && !$rev ) {
3610                                 $linkCache = LinkCache::singleton();
3611                                 $linkCache->addBadLinkObj( $title );
3612                         }
3613
3614                         $deps[] = [
3615                                 'title' => $title,
3616                                 'page_id' => $title->getArticleID(),
3617                                 'rev_id' => $rev_id ];
3618                         if ( $rev && !$title->equals( $rev->getTitle() ) ) {
3619                                 # We fetched a rev from a different title; register it too...
3620                                 $deps[] = [
3621                                         'title' => $rev->getTitle(),
3622                                         'page_id' => $rev->getPage(),
3623                                         'rev_id' => $rev_id ];
3624                         }
3625
3626                         if ( $rev ) {
3627                                 $content = $rev->getContent();
3628                                 $text = $content ? $content->getWikitextForTransclusion() : null;
3629
3630                                 Hooks::run( 'ParserFetchTemplate',
3631                                         [ $parser, $title, $rev, &$text, &$deps ] );
3632
3633                                 if ( $text === false || $text === null ) {
3634                                         $text = false;
3635                                         break;
3636                                 }
3637                         } elseif ( $title->getNamespace() == NS_MEDIAWIKI ) {
3638                                 global $wgContLang;
3639                                 $message = wfMessage( $wgContLang->lcfirst( $title->getText() ) )->inContentLanguage();
3640                                 if ( !$message->exists() ) {
3641                                         $text = false;
3642                                         break;
3643                                 }
3644                                 $content = $message->content();
3645                                 $text = $message->plain();
3646                         } else {
3647                                 break;
3648                         }
3649                         if ( !$content ) {
3650                                 break;
3651                         }
3652                         # Redirect?
3653                         $finalTitle = $title;
3654                         $title = $content->getRedirectTarget();
3655                 }
3656                 return [
3657                         'text' => $text,
3658                         'finalTitle' => $finalTitle,
3659                         'deps' => $deps ];
3660         }
3661
3662         /**
3663          * Fetch a file and its title and register a reference to it.
3664          * If 'broken' is a key in $options then the file will appear as a broken thumbnail.
3665          * @param Title $title
3666          * @param array $options Array of options to RepoGroup::findFile
3667          * @return File|bool
3668          */
3669         public function fetchFile( $title, $options = [] ) {
3670                 return $this->fetchFileAndTitle( $title, $options )[0];
3671         }
3672
3673         /**
3674          * Fetch a file and its title and register a reference to it.
3675          * If 'broken' is a key in $options then the file will appear as a broken thumbnail.
3676          * @param Title $title
3677          * @param array $options Array of options to RepoGroup::findFile
3678          * @return array ( File or false, Title of file )
3679          */
3680         public function fetchFileAndTitle( $title, $options = [] ) {
3681                 $file = $this->fetchFileNoRegister( $title, $options );
3682
3683                 $time = $file ? $file->getTimestamp() : false;
3684                 $sha1 = $file ? $file->getSha1() : false;
3685                 # Register the file as a dependency...
3686                 $this->mOutput->addImage( $title->getDBkey(), $time, $sha1 );
3687                 if ( $file && !$title->equals( $file->getTitle() ) ) {
3688                         # Update fetched file title
3689                         $title = $file->getTitle();
3690                         $this->mOutput->addImage( $title->getDBkey(), $time, $sha1 );
3691                 }
3692                 return [ $file, $title ];
3693         }
3694
3695         /**
3696          * Helper function for fetchFileAndTitle.
3697          *
3698          * Also useful if you need to fetch a file but not use it yet,
3699          * for example to get the file's handler.
3700          *
3701          * @param Title $title
3702          * @param array $options Array of options to RepoGroup::findFile
3703          * @return File|bool
3704          */
3705         protected function fetchFileNoRegister( $title, $options = [] ) {
3706                 if ( isset( $options['broken'] ) ) {
3707                         $file = false; // broken thumbnail forced by hook
3708                 } elseif ( isset( $options['sha1'] ) ) { // get by (sha1,timestamp)
3709                         $file = RepoGroup::singleton()->findFileFromKey( $options['sha1'], $options );
3710                 } else { // get by (name,timestamp)
3711                         $file = wfFindFile( $title, $options );
3712                 }
3713                 return $file;
3714         }
3715
3716         /**
3717          * Transclude an interwiki link.
3718          *
3719          * @param Title $title
3720          * @param string $action
3721          *
3722          * @return string
3723          */
3724         public function interwikiTransclude( $title, $action ) {
3725                 global $wgEnableScaryTranscluding;
3726
3727                 if ( !$wgEnableScaryTranscluding ) {
3728                         return wfMessage( 'scarytranscludedisabled' )->inContentLanguage()->text();
3729                 }
3730
3731                 $url = $title->getFullURL( [ 'action' => $action ] );
3732
3733                 if ( strlen( $url ) > 255 ) {
3734                         return wfMessage( 'scarytranscludetoolong' )->inContentLanguage()->text();
3735                 }
3736                 return $this->fetchScaryTemplateMaybeFromCache( $url );
3737         }
3738
3739         /**
3740          * @param string $url
3741          * @return mixed|string
3742          */
3743         public function fetchScaryTemplateMaybeFromCache( $url ) {
3744                 global $wgTranscludeCacheExpiry;
3745                 $dbr = wfGetDB( DB_REPLICA );
3746                 $tsCond = $dbr->timestamp( time() - $wgTranscludeCacheExpiry );
3747                 $obj = $dbr->selectRow( 'transcache', [ 'tc_time', 'tc_contents' ],
3748                                 [ 'tc_url' => $url, "tc_time >= " . $dbr->addQuotes( $tsCond ) ] );
3749                 if ( $obj ) {
3750                         return $obj->tc_contents;
3751                 }
3752
3753                 $req = MWHttpRequest::factory( $url, [], __METHOD__ );
3754                 $status = $req->execute(); // Status object
3755                 if ( $status->isOK() ) {
3756                         $text = $req->getContent();
3757                 } elseif ( $req->getStatus() != 200 ) {
3758                         // Though we failed to fetch the content, this status is useless.
3759                         return wfMessage( 'scarytranscludefailed-httpstatus' )
3760                                 ->params( $url, $req->getStatus() /* HTTP status */ )->inContentLanguage()->text();
3761                 } else {
3762                         return wfMessage( 'scarytranscludefailed', $url )->inContentLanguage()->text();
3763                 }
3764
3765                 $dbw = wfGetDB( DB_MASTER );
3766                 $dbw->replace( 'transcache', [ 'tc_url' ], [
3767                         'tc_url' => $url,
3768                         'tc_time' => $dbw->timestamp( time() ),
3769                         'tc_contents' => $text
3770                 ] );
3771                 return $text;
3772         }
3773
3774         /**
3775          * Triple brace replacement -- used for template arguments
3776          * @private
3777          *
3778          * @param array $piece
3779          * @param PPFrame $frame
3780          *
3781          * @return array
3782          */
3783         public function argSubstitution( $piece, $frame ) {
3784
3785                 $error = false;
3786                 $parts = $piece['parts'];
3787                 $nameWithSpaces = $frame->expand( $piece['title'] );
3788                 $argName = trim( $nameWithSpaces );
3789                 $object = false;
3790                 $text = $frame->getArgument( $argName );
3791                 if ( $text === false && $parts->getLength() > 0
3792                         && ( $this->ot['html']
3793                                 || $this->ot['pre']
3794                                 || ( $this->ot['wiki'] && $frame->isTemplate() )
3795                         )
3796                 ) {
3797                         # No match in frame, use the supplied default
3798                         $object = $parts->item( 0 )->getChildren();
3799                 }
3800                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3801                         $error = '<!-- WARNING: argument omitted, expansion size too large -->';
3802                         $this->limitationWarn( 'post-expand-template-argument' );
3803                 }
3804
3805                 if ( $text === false && $object === false ) {
3806                         # No match anywhere
3807                         $object = $frame->virtualBracketedImplode( '{{{', '|', '}}}', $nameWithSpaces, $parts );
3808                 }
3809                 if ( $error !== false ) {
3810                         $text .= $error;
3811                 }
3812                 if ( $object !== false ) {
3813                         $ret = [ 'object' => $object ];
3814                 } else {
3815                         $ret = [ 'text' => $text ];
3816                 }
3817
3818                 return $ret;
3819         }
3820
3821         /**
3822          * Return the text to be used for a given extension tag.
3823          * This is the ghost of strip().
3824          *
3825          * @param array $params Associative array of parameters:
3826          *     name       PPNode for the tag name
3827          *     attr       PPNode for unparsed text where tag attributes are thought to be
3828          *     attributes Optional associative array of parsed attributes
3829          *     inner      Contents of extension element
3830          *     noClose    Original text did not have a close tag
3831          * @param PPFrame $frame
3832          *
3833          * @throws MWException
3834          * @return string
3835          */
3836         public function extensionSubstitution( $params, $frame ) {
3837                 static $errorStr = '<span class="error">';
3838                 static $errorLen = 20;
3839
3840                 $name = $frame->expand( $params['name'] );
3841                 if ( substr( $name, 0, $errorLen ) === $errorStr ) {
3842                         // Probably expansion depth or node count exceeded. Just punt the
3843                         // error up.
3844                         return $name;
3845                 }
3846
3847                 $attrText = !isset( $params['attr'] ) ? null : $frame->expand( $params['attr'] );
3848                 if ( substr( $attrText, 0, $errorLen ) === $errorStr ) {
3849                         // See above
3850                         return $attrText;
3851                 }
3852
3853                 // We can't safely check if the expansion for $content resulted in an
3854                 // error, because the content could happen to be the error string
3855                 // (T149622).
3856                 $content = !isset( $params['inner'] ) ? null : $frame->expand( $params['inner'] );
3857
3858                 $marker = self::MARKER_PREFIX . "-$name-"
3859                         . sprintf( '%08X', $this->mMarkerIndex++ ) . self::MARKER_SUFFIX;
3860
3861                 $isFunctionTag = isset( $this->mFunctionTagHooks[strtolower( $name )] ) &&
3862                         ( $this->ot['html'] || $this->ot['pre'] );
3863                 if ( $isFunctionTag ) {
3864                         $markerType = 'none';
3865                 } else {
3866                         $markerType = 'general';
3867                 }
3868                 if ( $this->ot['html'] || $isFunctionTag ) {
3869                         $name = strtolower( $name );
3870                         $attributes = Sanitizer::decodeTagAttributes( $attrText );
3871                         if ( isset( $params['attributes'] ) ) {
3872                                 $attributes = $attributes + $params['attributes'];
3873                         }
3874
3875                         if ( isset( $this->mTagHooks[$name] ) ) {
3876                                 # Workaround for PHP bug 35229 and similar
3877                                 if ( !is_callable( $this->mTagHooks[$name] ) ) {
3878                                         throw new MWException( "Tag hook for $name is not callable\n" );
3879                                 }
3880                                 $output = call_user_func_array( $this->mTagHooks[$name],
3881                                         [ $content, $attributes, $this, $frame ] );
3882                         } elseif ( isset( $this->mFunctionTagHooks[$name] ) ) {
3883                                 list( $callback, ) = $this->mFunctionTagHooks[$name];
3884                                 if ( !is_callable( $callback ) ) {
3885                                         throw new MWException( "Tag hook for $name is not callable\n" );
3886                                 }
3887
3888                                 // Avoid PHP 7.1 warning from passing $this by reference
3889                                 $parser = $this;
3890                                 $output = call_user_func_array( $callback, [ &$parser, $frame, $content, $attributes ] );
3891                         } else {
3892                                 $output = '<span class="error">Invalid tag extension name: ' .
3893                                         htmlspecialchars( $name ) . '</span>';
3894                         }
3895
3896                         if ( is_array( $output ) ) {
3897                                 # Extract flags to local scope (to override $markerType)
3898                                 $flags = $output;
3899                                 $output = $flags[0];
3900                                 unset( $flags[0] );
3901                                 extract( $flags );
3902                         }
3903                 } else {
3904                         if ( is_null( $attrText ) ) {
3905                                 $attrText = '';
3906                         }
3907                         if ( isset( $params['attributes'] ) ) {
3908                                 foreach ( $params['attributes'] as $attrName => $attrValue ) {
3909                                         $attrText .= ' ' . htmlspecialchars( $attrName ) . '="' .
3910                                                 htmlspecialchars( $attrValue ) . '"';
3911                                 }
3912                         }
3913                         if ( $content === null ) {
3914                                 $output = "<$name$attrText/>";
3915                         } else {
3916                                 $close = is_null( $params['close'] ) ? '' : $frame->expand( $params['close'] );
3917                                 if ( substr( $close, 0, $errorLen ) === $errorStr ) {
3918                                         // See above
3919                                         return $close;
3920                                 }
3921                                 $output = "<$name$attrText>$content$close";
3922                         }
3923                 }
3924
3925                 if ( $markerType === 'none' ) {
3926                         return $output;
3927                 } elseif ( $markerType === 'nowiki' ) {
3928                         $this->mStripState->addNoWiki( $marker, $output );
3929                 } elseif ( $markerType === 'general' ) {
3930                         $this->mStripState->addGeneral( $marker, $output );
3931                 } else {
3932                         throw new MWException( __METHOD__ . ': invalid marker type' );
3933                 }
3934                 return $marker;
3935         }
3936
3937         /**
3938          * Increment an include size counter
3939          *
3940          * @param string $type The type of expansion
3941          * @param int $size The size of the text
3942          * @return bool False if this inclusion would take it over the maximum, true otherwise
3943          */
3944         public function incrementIncludeSize( $type, $size ) {
3945                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize() ) {
3946                         return false;
3947                 } else {
3948                         $this->mIncludeSizes[$type] += $size;
3949                         return true;
3950                 }
3951         }
3952
3953         /**
3954          * Increment the expensive function count
3955          *
3956          * @return bool False if the limit has been exceeded
3957          */
3958         public function incrementExpensiveFunctionCount() {
3959                 $this->mExpensiveFunctionCount++;
3960                 return $this->mExpensiveFunctionCount <= $this->mOptions->getExpensiveParserFunctionLimit();
3961         }
3962
3963         /**
3964          * Strip double-underscore items like __NOGALLERY__ and __NOTOC__
3965          * Fills $this->mDoubleUnderscores, returns the modified text
3966          *
3967          * @param string $text
3968          *
3969          * @return string
3970          */
3971         public function doDoubleUnderscore( $text ) {
3972
3973                 # The position of __TOC__ needs to be recorded
3974                 $mw = MagicWord::get( 'toc' );
3975                 if ( $mw->match( $text ) ) {
3976                         $this->mShowToc = true;
3977                         $this->mForceTocPosition = true;
3978
3979                         # Set a placeholder. At the end we'll fill it in with the TOC.
3980                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3981
3982                         # Only keep the first one.
3983                         $text = $mw->replace( '', $text );
3984                 }
3985
3986                 # Now match and remove the rest of them
3987                 $mwa = MagicWord::getDoubleUnderscoreArray();
3988                 $this->mDoubleUnderscores = $mwa->matchAndRemove( $text );
3989
3990                 if ( isset( $this->mDoubleUnderscores['nogallery'] ) ) {
3991                         $this->mOutput->mNoGallery = true;
3992                 }
3993                 if ( isset( $this->mDoubleUnderscores['notoc'] ) && !$this->mForceTocPosition ) {
3994                         $this->mShowToc = false;
3995                 }
3996                 if ( isset( $this->mDoubleUnderscores['hiddencat'] )
3997                         && $this->mTitle->getNamespace() == NS_CATEGORY
3998                 ) {
3999                         $this->addTrackingCategory( 'hidden-category-category' );
4000                 }
4001                 # (T10068) Allow control over whether robots index a page.
4002                 # __INDEX__ always overrides __NOINDEX__, see T16899
4003                 if ( isset( $this->mDoubleUnderscores['noindex'] ) && $this->mTitle->canUseNoindex() ) {
4004                         $this->mOutput->setIndexPolicy( 'noindex' );
4005                         $this->addTrackingCategory( 'noindex-category' );
4006                 }
4007                 if ( isset( $this->mDoubleUnderscores['index'] ) && $this->mTitle->canUseNoindex() ) {
4008                         $this->mOutput->setIndexPolicy( 'index' );
4009                         $this->addTrackingCategory( 'index-category' );
4010                 }
4011
4012                 # Cache all double underscores in the database
4013                 foreach ( $this->mDoubleUnderscores as $key => $val ) {
4014                         $this->mOutput->setProperty( $key, '' );
4015                 }
4016
4017                 return $text;
4018         }
4019
4020         /**
4021          * @see ParserOutput::addTrackingCategory()
4022          * @param string $msg Message key
4023          * @return bool Whether the addition was successful
4024          */
4025         public function addTrackingCategory( $msg ) {
4026                 return $this->mOutput->addTrackingCategory( $msg, $this->mTitle );
4027         }
4028
4029         /**
4030          * This function accomplishes several tasks:
4031          * 1) Auto-number headings if that option is enabled
4032          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
4033          * 3) Add a Table of contents on the top for users who have enabled the option
4034          * 4) Auto-anchor headings
4035          *
4036          * It loops through all headlines, collects the necessary data, then splits up the
4037          * string and re-inserts the newly formatted headlines.
4038          *
4039          * @param string $text
4040          * @param string $origText Original, untouched wikitext
4041          * @param bool $isMain
4042          * @return mixed|string
4043          * @private
4044          */
4045         public function formatHeadings( $text, $origText, $isMain = true ) {
4046                 global $wgMaxTocLevel, $wgExperimentalHtmlIds;
4047
4048                 # Inhibit editsection links if requested in the page
4049                 if ( isset( $this->mDoubleUnderscores['noeditsection'] ) ) {
4050                         $maybeShowEditLink = $showEditLink = false;
4051                 } else {
4052                         $maybeShowEditLink = true; /* Actual presence will depend on ParserOptions option */
4053                         $showEditLink = $this->mOptions->getEditSection();
4054                 }
4055                 if ( $showEditLink ) {
4056                         $this->mOutput->setEditSectionTokens( true );
4057                 }
4058
4059                 # Get all headlines for numbering them and adding funky stuff like [edit]
4060                 # links - this is for later, but we need the number of headlines right now
4061                 $matches = [];
4062                 $numMatches = preg_match_all(
4063                         '/<H(?P<level>[1-6])(?P<attrib>.*?>)\s*(?P<header>[\s\S]*?)\s*<\/H[1-6] *>/i',
4064                         $text,
4065                         $matches
4066                 );
4067
4068                 # if there are fewer than 4 headlines in the article, do not show TOC
4069                 # unless it's been explicitly enabled.
4070                 $enoughToc = $this->mShowToc &&
4071                         ( ( $numMatches >= 4 ) || $this->mForceTocPosition );
4072
4073                 # Allow user to stipulate that a page should have a "new section"
4074                 # link added via __NEWSECTIONLINK__
4075                 if ( isset( $this->mDoubleUnderscores['newsectionlink'] ) ) {
4076                         $this->mOutput->setNewSection( true );
4077                 }
4078
4079                 # Allow user to remove the "new section"
4080                 # link via __NONEWSECTIONLINK__
4081                 if ( isset( $this->mDoubleUnderscores['nonewsectionlink'] ) ) {
4082                         $this->mOutput->hideNewSection( true );
4083                 }
4084
4085                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
4086                 # override above conditions and always show TOC above first header
4087                 if ( isset( $this->mDoubleUnderscores['forcetoc'] ) ) {
4088                         $this->mShowToc = true;
4089                         $enoughToc = true;
4090                 }
4091
4092                 # headline counter
4093                 $headlineCount = 0;
4094                 $numVisible = 0;
4095
4096                 # Ugh .. the TOC should have neat indentation levels which can be
4097                 # passed to the skin functions. These are determined here
4098                 $toc = '';
4099                 $full = '';
4100                 $head = [];
4101                 $sublevelCount = [];
4102                 $levelCount = [];
4103                 $level = 0;
4104                 $prevlevel = 0;
4105                 $toclevel = 0;
4106                 $prevtoclevel = 0;
4107                 $markerRegex = self::MARKER_PREFIX . "-h-(\d+)-" . self::MARKER_SUFFIX;
4108                 $baseTitleText = $this->mTitle->getPrefixedDBkey();
4109                 $oldType = $this->mOutputType;
4110                 $this->setOutputType( self::OT_WIKI );
4111                 $frame = $this->getPreprocessor()->newFrame();
4112                 $root = $this->preprocessToDom( $origText );
4113                 $node = $root->getFirstChild();
4114                 $byteOffset = 0;
4115                 $tocraw = [];
4116                 $refers = [];
4117
4118                 $headlines = $numMatches !== false ? $matches[3] : [];
4119
4120                 foreach ( $headlines as $headline ) {
4121                         $isTemplate = false;
4122                         $titleText = false;
4123                         $sectionIndex = false;
4124                         $numbering = '';
4125                         $markerMatches = [];
4126                         if ( preg_match( "/^$markerRegex/", $headline, $markerMatches ) ) {
4127                                 $serial = $markerMatches[1];
4128                                 list( $titleText, $sectionIndex ) = $this->mHeadings[$serial];
4129                                 $isTemplate = ( $titleText != $baseTitleText );
4130                                 $headline = preg_replace( "/^$markerRegex\\s*/", "", $headline );
4131                         }
4132
4133                         if ( $toclevel ) {
4134                                 $prevlevel = $level;
4135                         }
4136                         $level = $matches[1][$headlineCount];
4137
4138                         if ( $level > $prevlevel ) {
4139                                 # Increase TOC level
4140                                 $toclevel++;
4141                                 $sublevelCount[$toclevel] = 0;
4142                                 if ( $toclevel < $wgMaxTocLevel ) {
4143                                         $prevtoclevel = $toclevel;
4144                                         $toc .= Linker::tocIndent();
4145                                         $numVisible++;
4146                                 }
4147                         } elseif ( $level < $prevlevel && $toclevel > 1 ) {
4148                                 # Decrease TOC level, find level to jump to
4149
4150                                 for ( $i = $toclevel; $i > 0; $i-- ) {
4151                                         if ( $levelCount[$i] == $level ) {
4152                                                 # Found last matching level
4153                                                 $toclevel = $i;
4154                                                 break;
4155                                         } elseif ( $levelCount[$i] < $level ) {
4156                                                 # Found first matching level below current level
4157                                                 $toclevel = $i + 1;
4158                                                 break;
4159                                         }
4160                                 }
4161                                 if ( $i == 0 ) {
4162                                         $toclevel = 1;
4163                                 }
4164                                 if ( $toclevel < $wgMaxTocLevel ) {
4165                                         if ( $prevtoclevel < $wgMaxTocLevel ) {
4166                                                 # Unindent only if the previous toc level was shown :p
4167                                                 $toc .= Linker::tocUnindent( $prevtoclevel - $toclevel );
4168                                                 $prevtoclevel = $toclevel;
4169                                         } else {
4170                                                 $toc .= Linker::tocLineEnd();
4171                                         }
4172                                 }
4173                         } else {
4174                                 # No change in level, end TOC line
4175                                 if ( $toclevel < $wgMaxTocLevel ) {
4176                                         $toc .= Linker::tocLineEnd();
4177                                 }
4178                         }
4179
4180                         $levelCount[$toclevel] = $level;
4181
4182                         # count number of headlines for each level
4183                         $sublevelCount[$toclevel]++;
4184                         $dot = 0;
4185                         for ( $i = 1; $i <= $toclevel; $i++ ) {
4186                                 if ( !empty( $sublevelCount[$i] ) ) {
4187                                         if ( $dot ) {
4188                                                 $numbering .= '.';
4189                                         }
4190                                         $numbering .= $this->getTargetLanguage()->formatNum( $sublevelCount[$i] );
4191                                         $dot = 1;
4192                                 }
4193                         }
4194
4195                         # The safe header is a version of the header text safe to use for links
4196
4197                         # Remove link placeholders by the link text.
4198                         #     <!--LINK number-->
4199                         # turns into
4200                         #     link text with suffix
4201                         # Do this before unstrip since link text can contain strip markers
4202                         $safeHeadline = $this->replaceLinkHoldersText( $headline );
4203
4204                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
4205                         $safeHeadline = $this->mStripState->unstripBoth( $safeHeadline );
4206
4207                         # Strip out HTML (first regex removes any tag not allowed)
4208                         # Allowed tags are:
4209                         # * <sup> and <sub> (T10393)
4210                         # * <i> (T28375)
4211                         # * <b> (r105284)
4212                         # * <bdi> (T74884)
4213                         # * <span dir="rtl"> and <span dir="ltr"> (T37167)
4214                         # * <s> and <strike> (T35715)
4215                         # We strip any parameter from accepted tags (second regex), except dir="rtl|ltr" from <span>,
4216                         # to allow setting directionality in toc items.
4217                         $tocline = preg_replace(
4218                                 [
4219                                         '#<(?!/?(span|sup|sub|bdi|i|b|s|strike)(?: [^>]*)?>).*?>#',
4220                                         '#<(/?(?:span(?: dir="(?:rtl|ltr)")?|sup|sub|bdi|i|b|s|strike))(?: .*?)?>#'
4221                                 ],
4222                                 [ '', '<$1>' ],
4223                                 $safeHeadline
4224                         );
4225
4226                         # Strip '<span></span>', which is the result from the above if
4227                         # <span id="foo"></span> is used to produce an additional anchor
4228                         # for a section.
4229                         $tocline = str_replace( '<span></span>', '', $tocline );
4230
4231                         $tocline = trim( $tocline );
4232
4233                         # For the anchor, strip out HTML-y stuff period
4234                         $safeHeadline = preg_replace( '/<.*?>/', '', $safeHeadline );
4235                         $safeHeadline = Sanitizer::normalizeSectionNameWhitespace( $safeHeadline );
4236
4237                         # Save headline for section edit hint before it's escaped
4238                         $headlineHint = $safeHeadline;
4239
4240                         if ( $wgExperimentalHtmlIds ) {
4241                                 # For reverse compatibility, provide an id that's
4242                                 # HTML4-compatible, like we used to.
4243                                 # It may be worth noting, academically, that it's possible for
4244                                 # the legacy anchor to conflict with a non-legacy headline
4245                                 # anchor on the page.  In this case likely the "correct" thing
4246                                 # would be to either drop the legacy anchors or make sure
4247                                 # they're numbered first.  However, this would require people
4248                                 # to type in section names like "abc_.D7.93.D7.90.D7.A4"
4249                                 # manually, so let's not bother worrying about it.
4250                                 $legacyHeadline = Sanitizer::escapeId( $safeHeadline,
4251                                         [ 'noninitial', 'legacy' ] );
4252                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline );
4253
4254                                 if ( $legacyHeadline == $safeHeadline ) {
4255                                         # No reason to have both (in fact, we can't)
4256                                         $legacyHeadline = false;
4257                                 }
4258                         } else {
4259                                 $legacyHeadline = false;
4260                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline,
4261                                         'noninitial' );
4262                         }
4263
4264                         # HTML names must be case-insensitively unique (T12721).
4265                         # This does not apply to Unicode characters per
4266                         # https://www.w3.org/TR/html5/infrastructure.html#case-sensitivity-and-string-comparison
4267                         # @todo FIXME: We may be changing them depending on the current locale.
4268                         $arrayKey = strtolower( $safeHeadline );
4269                         if ( $legacyHeadline === false ) {
4270                                 $legacyArrayKey = false;
4271                         } else {
4272                                 $legacyArrayKey = strtolower( $legacyHeadline );
4273                         }
4274
4275                         # Create the anchor for linking from the TOC to the section
4276                         $anchor = $safeHeadline;
4277                         $legacyAnchor = $legacyHeadline;
4278                         if ( isset( $refers[$arrayKey] ) ) {
4279                                 // @codingStandardsIgnoreStart
4280                                 for ( $i = 2; isset( $refers["${arrayKey}_$i"] ); ++$i );
4281                                 // @codingStandardsIgnoreEnd
4282                                 $anchor .= "_$i";
4283                                 $refers["${arrayKey}_$i"] = true;
4284                         } else {
4285                                 $refers[$arrayKey] = true;
4286                         }
4287                         if ( $legacyHeadline !== false && isset( $refers[$legacyArrayKey] ) ) {
4288                                 // @codingStandardsIgnoreStart
4289                                 for ( $i = 2; isset( $refers["${legacyArrayKey}_$i"] ); ++$i );
4290                                 // @codingStandardsIgnoreEnd
4291                                 $legacyAnchor .= "_$i";
4292                                 $refers["${legacyArrayKey}_$i"] = true;
4293                         } else {
4294                                 $refers[$legacyArrayKey] = true;
4295                         }
4296
4297                         # Don't number the heading if it is the only one (looks silly)
4298                         if ( count( $matches[3] ) > 1 && $this->mOptions->getNumberHeadings() ) {
4299                                 # the two are different if the line contains a link
4300                                 $headline = Html::element(
4301                                         'span',
4302                                         [ 'class' => 'mw-headline-number' ],
4303                                         $numbering
4304                                 ) . ' ' . $headline;
4305                         }
4306
4307                         if ( $enoughToc && ( !isset( $wgMaxTocLevel ) || $toclevel < $wgMaxTocLevel ) ) {
4308                                 $toc .= Linker::tocLine( $anchor, $tocline,
4309                                         $numbering, $toclevel, ( $isTemplate ? false : $sectionIndex ) );
4310                         }
4311
4312                         # Add the section to the section tree
4313                         # Find the DOM node for this header
4314                         $noOffset = ( $isTemplate || $sectionIndex === false );
4315                         while ( $node && !$noOffset ) {
4316                                 if ( $node->getName() === 'h' ) {
4317                                         $bits = $node->splitHeading();
4318                                         if ( $bits['i'] == $sectionIndex ) {
4319                                                 break;
4320                                         }
4321                                 }
4322                                 $byteOffset += mb_strlen( $this->mStripState->unstripBoth(
4323                                         $frame->expand( $node, PPFrame::RECOVER_ORIG ) ) );
4324                                 $node = $node->getNextSibling();
4325                         }
4326                         $tocraw[] = [
4327                                 'toclevel' => $toclevel,
4328                                 'level' => $level,
4329                                 'line' => $tocline,
4330                                 'number' => $numbering,
4331                                 'index' => ( $isTemplate ? 'T-' : '' ) . $sectionIndex,
4332                                 'fromtitle' => $titleText,
4333                                 'byteoffset' => ( $noOffset ? null : $byteOffset ),
4334                                 'anchor' => $anchor,
4335                         ];
4336
4337                         # give headline the correct <h#> tag
4338                         if ( $maybeShowEditLink && $sectionIndex !== false ) {
4339                                 // Output edit section links as markers with styles that can be customized by skins
4340                                 if ( $isTemplate ) {
4341                                         # Put a T flag in the section identifier, to indicate to extractSections()
4342                                         # that sections inside <includeonly> should be counted.
4343                                         $editsectionPage = $titleText;
4344                                         $editsectionSection = "T-$sectionIndex";
4345                                         $editsectionContent = null;
4346                                 } else {
4347                                         $editsectionPage = $this->mTitle->getPrefixedText();
4348                                         $editsectionSection = $sectionIndex;
4349                                         $editsectionContent = $headlineHint;
4350                                 }
4351                                 // We use a bit of pesudo-xml for editsection markers. The
4352                                 // language converter is run later on. Using a UNIQ style marker
4353                                 // leads to the converter screwing up the tokens when it
4354                                 // converts stuff. And trying to insert strip tags fails too. At
4355                                 // this point all real inputted tags have already been escaped,
4356                                 // so we don't have to worry about a user trying to input one of
4357                                 // these markers directly. We use a page and section attribute
4358                                 // to stop the language converter from converting these
4359                                 // important bits of data, but put the headline hint inside a
4360                                 // content block because the language converter is supposed to
4361                                 // be able to convert that piece of data.
4362                                 // Gets replaced with html in ParserOutput::getText
4363                                 $editlink = '<mw:editsection page="' . htmlspecialchars( $editsectionPage );
4364                                 $editlink .= '" section="' . htmlspecialchars( $editsectionSection ) . '"';
4365                                 if ( $editsectionContent !== null ) {
4366                                         $editlink .= '>' . $editsectionContent . '</mw:editsection>';
4367                                 } else {
4368                                         $editlink .= '/>';
4369                                 }
4370                         } else {
4371                                 $editlink = '';
4372                         }
4373                         $head[$headlineCount] = Linker::makeHeadline( $level,
4374                                 $matches['attrib'][$headlineCount], $anchor, $headline,
4375                                 $editlink, $legacyAnchor );
4376
4377                         $headlineCount++;
4378                 }
4379
4380                 $this->setOutputType( $oldType );
4381
4382                 # Never ever show TOC if no headers
4383                 if ( $numVisible < 1 ) {
4384                         $enoughToc = false;
4385                 }
4386
4387                 if ( $enoughToc ) {
4388                         if ( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
4389                                 $toc .= Linker::tocUnindent( $prevtoclevel - 1 );
4390                         }
4391                         $toc = Linker::tocList( $toc, $this->mOptions->getUserLangObj() );
4392                         $this->mOutput->setTOCHTML( $toc );
4393                         $toc = self::TOC_START . $toc . self::TOC_END;
4394                         $this->mOutput->addModules( 'mediawiki.toc' );
4395                 }
4396
4397                 if ( $isMain ) {
4398                         $this->mOutput->setSections( $tocraw );
4399                 }
4400
4401                 # split up and insert constructed headlines
4402                 $blocks = preg_split( '/<H[1-6].*?>[\s\S]*?<\/H[1-6]>/i', $text );
4403                 $i = 0;
4404
4405                 // build an array of document sections
4406                 $sections = [];
4407                 foreach ( $blocks as $block ) {
4408                         // $head is zero-based, sections aren't.
4409                         if ( empty( $head[$i - 1] ) ) {
4410                                 $sections[$i] = $block;
4411                         } else {
4412                                 $sections[$i] = $head[$i - 1] . $block;
4413                         }
4414
4415                         /**
4416                          * Send a hook, one per section.
4417                          * The idea here is to be able to make section-level DIVs, but to do so in a
4418                          * lower-impact, more correct way than r50769
4419                          *
4420                          * $this : caller
4421                          * $section : the section number
4422                          * &$sectionContent : ref to the content of the section
4423                          * $showEditLinks : boolean describing whether this section has an edit link
4424                          */
4425                         Hooks::run( 'ParserSectionCreate', [ $this, $i, &$sections[$i], $showEditLink ] );
4426
4427                         $i++;
4428                 }
4429
4430                 if ( $enoughToc && $isMain && !$this->mForceTocPosition ) {
4431                         // append the TOC at the beginning
4432                         // Top anchor now in skin
4433                         $sections[0] = $sections[0] . $toc . "\n";
4434                 }
4435
4436                 $full .= implode( '', $sections );
4437
4438                 if ( $this->mForceTocPosition ) {
4439                         return str_replace( '<!--MWTOC-->', $toc, $full );
4440                 } else {
4441                         return $full;
4442                 }
4443         }
4444
4445         /**
4446          * Transform wiki markup when saving a page by doing "\r\n" -> "\n"
4447          * conversion, substituting signatures, {{subst:}} templates, etc.
4448          *
4449          * @param string $text The text to transform
4450          * @param Title $title The Title object for the current article
4451          * @param User $user The User object describing the current user
4452          * @param ParserOptions $options Parsing options
4453          * @param bool $clearState Whether to clear the parser state first
4454          * @return string The altered wiki markup
4455          */
4456         public function preSaveTransform( $text, Title $title, User $user,
4457                 ParserOptions $options, $clearState = true
4458         ) {
4459                 if ( $clearState ) {
4460                         $magicScopeVariable = $this->lock();
4461                 }
4462                 $this->startParse( $title, $options, self::OT_WIKI, $clearState );
4463                 $this->setUser( $user );
4464
4465                 // We still normalize line endings for backwards-compatibility
4466                 // with other code that just calls PST, but this should already
4467                 // be handled in TextContent subclasses
4468                 $text = TextContent::normalizeLineEndings( $text );
4469
4470                 if ( $options->getPreSaveTransform() ) {
4471                         $text = $this->pstPass2( $text, $user );
4472                 }
4473                 $text = $this->mStripState->unstripBoth( $text );
4474
4475                 $this->setUser( null ); # Reset
4476
4477                 return $text;
4478         }
4479
4480         /**
4481          * Pre-save transform helper function
4482          *
4483          * @param string $text
4484          * @param User $user
4485          *
4486          * @return string
4487          */
4488         private function pstPass2( $text, $user ) {
4489                 global $wgContLang;
4490
4491                 # Note: This is the timestamp saved as hardcoded wikitext to
4492                 # the database, we use $wgContLang here in order to give
4493                 # everyone the same signature and use the default one rather
4494                 # than the one selected in each user's preferences.
4495                 # (see also T14815)
4496                 $ts = $this->mOptions->getTimestamp();
4497                 $timestamp = MWTimestamp::getLocalInstance( $ts );
4498                 $ts = $timestamp->format( 'YmdHis' );
4499                 $tzMsg = $timestamp->getTimezoneMessage()->inContentLanguage()->text();
4500
4501                 $d = $wgContLang->timeanddate( $ts, false, false ) . " ($tzMsg)";
4502
4503                 # Variable replacement
4504                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
4505                 $text = $this->replaceVariables( $text );
4506
4507                 # This works almost by chance, as the replaceVariables are done before the getUserSig(),
4508                 # which may corrupt this parser instance via its wfMessage()->text() call-
4509
4510                 # Signatures
4511                 $sigText = $this->getUserSig( $user );
4512                 $text = strtr( $text, [
4513                         '~~~~~' => $d,
4514                         '~~~~' => "$sigText $d",
4515                         '~~~' => $sigText
4516                 ] );
4517
4518                 # Context links ("pipe tricks"): [[|name]] and [[name (context)|]]
4519                 $tc = '[' . Title::legalChars() . ']';
4520                 $nc = '[ _0-9A-Za-z\x80-\xff-]'; # Namespaces can use non-ascii!
4521
4522                 // [[ns:page (context)|]]
4523                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( ?\\($tc+\\))\\|]]/";
4524                 // [[ns:page（context）|]] (double-width brackets, added in r40257)
4525                 $p4 = "/\[\[(:?$nc+:|:|)($tc+?)( ?（$tc+）)\\|]]/";
4526                 // [[ns:page (context), context|]] (using either single or double-width comma)
4527                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( ?\\($tc+\\)|)((?:, |，)$tc+|)\\|]]/";
4528                 // [[|page]] (reverse pipe trick: add context from page title)
4529                 $p2 = "/\[\[\\|($tc+)]]/";
4530
4531                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
4532                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
4533                 $text = preg_replace( $p4, '[[\\1\\2\\3|\\2]]', $text );
4534                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
4535
4536                 $t = $this->mTitle->getText();
4537                 $m = [];
4538                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
4539                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4540                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && "$m[1]$m[2]" != '' ) {
4541                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4542                 } else {
4543                         # if there's no context, don't bother duplicating the title
4544                         $text = preg_replace( $p2, '[[\\1]]', $text );
4545                 }
4546
4547                 return $text;
4548         }
4549
4550         /**
4551          * Fetch the user's signature text, if any, and normalize to
4552          * validated, ready-to-insert wikitext.
4553          * If you have pre-fetched the nickname or the fancySig option, you can
4554          * specify them here to save a database query.
4555          * Do not reuse this parser instance after calling getUserSig(),
4556          * as it may have changed if it's the $wgParser.
4557          *
4558          * @param User $user
4559          * @param string|bool $nickname Nickname to use or false to use user's default nickname
4560          * @param bool|null $fancySig whether the nicknname is the complete signature
4561          *    or null to use default value
4562          * @return string
4563          */
4564         public function getUserSig( &$user, $nickname = false, $fancySig = null ) {
4565                 global $wgMaxSigChars;
4566
4567                 $username = $user->getName();
4568
4569                 # If not given, retrieve from the user object.
4570                 if ( $nickname === false ) {
4571                         $nickname = $user->getOption( 'nickname' );
4572                 }
4573
4574                 if ( is_null( $fancySig ) ) {
4575                         $fancySig = $user->getBoolOption( 'fancysig' );
4576                 }
4577
4578                 $nickname = $nickname == null ? $username : $nickname;
4579
4580                 if ( mb_strlen( $nickname ) > $wgMaxSigChars ) {
4581                         $nickname = $username;
4582                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
4583                 } elseif ( $fancySig !== false ) {
4584                         # Sig. might contain markup; validate this
4585                         if ( $this->validateSig( $nickname ) !== false ) {
4586                                 # Validated; clean up (if needed) and return it
4587                                 return $this->cleanSig( $nickname, true );
4588                         } else {
4589                                 # Failed to validate; fall back to the default
4590                                 $nickname = $username;
4591                                 wfDebug( __METHOD__ . ": $username has bad XML tags in signature.\n" );
4592                         }
4593                 }
4594
4595                 # Make sure nickname doesnt get a sig in a sig
4596                 $nickname = self::cleanSigInSig( $nickname );
4597
4598                 # If we're still here, make it a link to the user page
4599                 $userText = wfEscapeWikiText( $username );
4600                 $nickText = wfEscapeWikiText( $nickname );
4601                 $msgName = $user->isAnon() ? 'signature-anon' : 'signature';
4602
4603                 return wfMessage( $msgName, $userText, $nickText )->inContentLanguage()
4604                         ->title( $this->getTitle() )->text();
4605         }
4606
4607         /**
4608          * Check that the user's signature contains no bad XML
4609          *
4610          * @param string $text
4611          * @return string|bool An expanded string, or false if invalid.
4612          */
4613         public function validateSig( $text ) {
4614                 return Xml::isWellFormedXmlFragment( $text ) ? $text : false;
4615         }
4616
4617         /**
4618          * Clean up signature text
4619          *
4620          * 1) Strip 3, 4 or 5 tildes out of signatures @see cleanSigInSig
4621          * 2) Substitute all transclusions
4622          *
4623          * @param string $text
4624          * @param bool $parsing Whether we're cleaning (preferences save) or parsing
4625          * @return string Signature text
4626          */
4627         public function cleanSig( $text, $parsing = false ) {
4628                 if ( !$parsing ) {
4629                         global $wgTitle;
4630                         $magicScopeVariable = $this->lock();
4631                         $this->startParse( $wgTitle, new ParserOptions, self::OT_PREPROCESS, true );
4632                 }
4633
4634                 # Option to disable this feature
4635                 if ( !$this->mOptions->getCleanSignatures() ) {
4636                         return $text;
4637                 }
4638
4639                 # @todo FIXME: Regex doesn't respect extension tags or nowiki
4640                 #  => Move this logic to braceSubstitution()
4641                 $substWord = MagicWord::get( 'subst' );
4642                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
4643                 $substText = '{{' . $substWord->getSynonym( 0 );
4644
4645                 $text = preg_replace( $substRegex, $substText, $text );
4646                 $text = self::cleanSigInSig( $text );
4647                 $dom = $this->preprocessToDom( $text );
4648                 $frame = $this->getPreprocessor()->newFrame();
4649                 $text = $frame->expand( $dom );
4650
4651                 if ( !$parsing ) {
4652                         $text = $this->mStripState->unstripBoth( $text );
4653                 }
4654
4655                 return $text;
4656         }
4657
4658         /**
4659          * Strip 3, 4 or 5 tildes out of signatures.
4660          *
4661          * @param string $text
4662          * @return string Signature text with /~{3,5}/ removed
4663          */
4664         public static function cleanSigInSig( $text ) {
4665                 $text = preg_replace( '/~{3,5}/', '', $text );
4666                 return $text;
4667         }
4668
4669         /**
4670          * Set up some variables which are usually set up in parse()
4671          * so that an external function can call some class members with confidence
4672          *
4673          * @param Title|null $title
4674          * @param ParserOptions $options
4675          * @param int $outputType
4676          * @param bool $clearState
4677          */
4678         public function startExternalParse( Title $title = null, ParserOptions $options,
4679                 $outputType, $clearState = true
4680         ) {
4681                 $this->startParse( $title, $options, $outputType, $clearState );
4682         }
4683
4684         /**
4685          * @param Title|null $title
4686          * @param ParserOptions $options
4687          * @param int $outputType
4688          * @param bool $clearState
4689          */
4690         private function startParse( Title $title = null, ParserOptions $options,
4691                 $outputType, $clearState = true
4692         ) {
4693                 $this->setTitle( $title );
4694                 $this->mOptions = $options;
4695                 $this->setOutputType( $outputType );
4696                 if ( $clearState ) {
4697                         $this->clearState();
4698                 }
4699         }
4700
4701         /**
4702          * Wrapper for preprocess()
4703          *
4704          * @param string $text The text to preprocess
4705          * @param ParserOptions $options Options
4706          * @param Title|null $title Title object or null to use $wgTitle
4707          * @return string
4708          */
4709         public function transformMsg( $text, $options, $title = null ) {
4710                 static $executing = false;
4711
4712                 # Guard against infinite recursion
4713                 if ( $executing ) {
4714                         return $text;
4715                 }
4716                 $executing = true;
4717
4718                 if ( !$title ) {
4719                         global $wgTitle;
4720                         $title = $wgTitle;
4721                 }
4722
4723                 $text = $this->preprocess( $text, $title, $options );
4724
4725                 $executing = false;
4726                 return $text;
4727         }
4728
4729         /**
4730          * Create an HTML-style tag, e.g. "<yourtag>special text</yourtag>"
4731          * The callback should have the following form:
4732          *    function myParserHook( $text, $params, $parser, $frame ) { ... }
4733          *
4734          * Transform and return $text. Use $parser for any required context, e.g. use
4735          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
4736          *
4737          * Hooks may return extended information by returning an array, of which the
4738          * first numbered element (index 0) must be the return string, and all other
4739          * entries are extracted into local variables within an internal function
4740          * in the Parser class.
4741          *
4742          * This interface (introduced r61913) appears to be undocumented, but
4743          * 'markerType' is used by some core tag hooks to override which strip
4744          * array their results are placed in. **Use great caution if attempting
4745          * this interface, as it is not documented and injudicious use could smash
4746          * private variables.**
4747          *
4748          * @param string $tag The tag to use, e.g. 'hook' for "<hook>"
4749          * @param callable $callback The callback function (and object) to use for the tag
4750          * @throws MWException
4751          * @return callable|null The old value of the mTagHooks array associated with the hook
4752          */
4753         public function setHook( $tag, $callback ) {
4754                 $tag = strtolower( $tag );
4755                 if ( preg_match( '/[<>\r\n]/', $tag, $m ) ) {
4756                         throw new MWException( "Invalid character {$m[0]} in setHook('$tag', ...) call" );
4757                 }
4758                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
4759                 $this->mTagHooks[$tag] = $callback;
4760                 if ( !in_array( $tag, $this->mStripList ) ) {
4761                         $this->mStripList[] = $tag;
4762                 }
4763
4764                 return $oldVal;
4765         }
4766
4767         /**
4768          * As setHook(), but letting the contents be parsed.
4769          *
4770          * Transparent tag hooks are like regular XML-style tag hooks, except they
4771          * operate late in the transformation sequence, on HTML instead of wikitext.
4772          *
4773          * This is probably obsoleted by things dealing with parser frames?
4774          * The only extension currently using it is geoserver.
4775          *
4776          * @since 1.10
4777          * @todo better document or deprecate this
4778          *
4779          * @param string $tag The tag to use, e.g. 'hook' for "<hook>"
4780          * @param callable $callback The callback function (and object) to use for the tag
4781          * @throws MWException
4782          * @return callable|null The old value of the mTagHooks array associated with the hook
4783          */
4784         public function setTransparentTagHook( $tag, $callback ) {
4785                 $tag = strtolower( $tag );
4786                 if ( preg_match( '/[<>\r\n]/', $tag, $m ) ) {
4787                         throw new MWException( "Invalid character {$m[0]} in setTransparentHook('$tag', ...) call" );
4788                 }
4789                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
4790                 $this->mTransparentTagHooks[$tag] = $callback;
4791
4792                 return $oldVal;
4793         }
4794
4795         /**
4796          * Remove all tag hooks
4797          */
4798         public function clearTagHooks() {
4799                 $this->mTagHooks = [];
4800                 $this->mFunctionTagHooks = [];
4801                 $this->mStripList = $this->mDefaultStripList;
4802         }
4803
4804         /**
4805          * Create a function, e.g. {{sum:1|2|3}}
4806          * The callback function should have the form:
4807          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
4808          *
4809          * Or with Parser::SFH_OBJECT_ARGS:
4810          *    function myParserFunction( $parser, $frame, $args ) { ... }
4811          *
4812          * The callback may either return the text result of the function, or an array with the text
4813          * in element 0, and a number of flags in the other elements. The names of the flags are
4814          * specified in the keys. Valid flags are:
4815          *   found                     The text returned is valid, stop processing the template. This
4816          *                             is on by default.
4817          *   nowiki                    Wiki markup in the return value should be escaped
4818          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
4819          *
4820          * @param string $id The magic word ID
4821          * @param callable $callback The callback function (and object) to use
4822          * @param int $flags A combination of the following flags:
4823          *     Parser::SFH_NO_HASH      No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
4824          *
4825          *     Parser::SFH_OBJECT_ARGS  Pass the template arguments as PPNode objects instead of text.
4826          *     This allows for conditional expansion of the parse tree, allowing you to eliminate dead
4827          *     branches and thus speed up parsing. It is also possible to analyse the parse tree of
4828          *     the arguments, and to control the way they are expanded.
4829          *
4830          *     The $frame parameter is a PPFrame. This can be used to produce expanded text from the
4831          *     arguments, for instance:
4832          *         $text = isset( $args[0] ) ? $frame->expand( $args[0] ) : '';
4833          *
4834          *     For technical reasons, $args[0] is pre-expanded and will be a string. This may change in
4835          *     future versions. Please call $frame->expand() on it anyway so that your code keeps
4836          *     working if/when this is changed.
4837          *
4838          *     If you want whitespace to be trimmed from $args, you need to do it yourself, post-
4839          *     expansion.
4840          *
4841          *     Please read the documentation in includes/parser/Preprocessor.php for more information
4842          *     about the methods available in PPFrame and PPNode.
4843          *
4844          * @throws MWException
4845          * @return string|callable The old callback function for this name, if any
4846          */
4847         public function setFunctionHook( $id, $callback, $flags = 0 ) {
4848                 global $wgContLang;
4849
4850                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id][0] : null;
4851                 $this->mFunctionHooks[$id] = [ $callback, $flags ];
4852
4853                 # Add to function cache
4854                 $mw = MagicWord::get( $id );
4855                 if ( !$mw ) {
4856                         throw new MWException( __METHOD__ . '() expecting a magic word identifier.' );
4857                 }
4858
4859                 $synonyms = $mw->getSynonyms();
4860                 $sensitive = intval( $mw->isCaseSensitive() );
4861
4862                 foreach ( $synonyms as $syn ) {
4863                         # Case
4864                         if ( !$sensitive ) {
4865                                 $syn = $wgContLang->lc( $syn );
4866                         }
4867                         # Add leading hash
4868                         if ( !( $flags & self::SFH_NO_HASH ) ) {
4869                                 $syn = '#' . $syn;
4870                         }
4871                         # Remove trailing colon
4872                         if ( substr( $syn, -1, 1 ) === ':' ) {
4873                                 $syn = substr( $syn, 0, -1 );
4874                         }
4875                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
4876                 }
4877                 return $oldVal;
4878         }
4879
4880         /**
4881          * Get all registered function hook identifiers
4882          *
4883          * @return array
4884          */
4885         public function getFunctionHooks() {
4886                 return array_keys( $this->mFunctionHooks );
4887         }
4888
4889         /**
4890          * Create a tag function, e.g. "<test>some stuff</test>".
4891          * Unlike tag hooks, tag functions are parsed at preprocessor level.
4892          * Unlike parser functions, their content is not preprocessed.
4893          * @param string $tag
4894          * @param callable $callback
4895          * @param int $flags
4896          * @throws MWException
4897          * @return null
4898          */
4899         public function setFunctionTagHook( $tag, $callback, $flags ) {
4900                 $tag = strtolower( $tag );
4901                 if ( preg_match( '/[<>\r\n]/', $tag, $m ) ) {
4902                         throw new MWException( "Invalid character {$m[0]} in setFunctionTagHook('$tag', ...) call" );
4903                 }
4904                 $old = isset( $this->mFunctionTagHooks[$tag] ) ?
4905                         $this->mFunctionTagHooks[$tag] : null;
4906                 $this->mFunctionTagHooks[$tag] = [ $callback, $flags ];
4907
4908                 if ( !in_array( $tag, $this->mStripList ) ) {
4909                         $this->mStripList[] = $tag;
4910                 }
4911
4912                 return $old;
4913         }
4914
4915         /**
4916          * Replace "<!--LINK-->" link placeholders with actual links, in the buffer
4917          * Placeholders created in Linker::link()
4918          *
4919          * @param string $text
4920          * @param int $options
4921          */
4922         public function replaceLinkHolders( &$text, $options = 0 ) {
4923                 $this->mLinkHolders->replace( $text );
4924         }
4925
4926         /**
4927          * Replace "<!--LINK-->" link placeholders with plain text of links
4928          * (not HTML-formatted).
4929          *
4930          * @param string $text
4931          * @return string
4932          */
4933         public function replaceLinkHoldersText( $text ) {
4934                 return $this->mLinkHolders->replaceText( $text );
4935         }
4936
4937         /**
4938          * Renders an image gallery from a text with one line per image.
4939          * text labels may be given by using |-style alternative text. E.g.
4940          *   Image:one.jpg|The number "1"
4941          *   Image:tree.jpg|A tree
4942          * given as text will return the HTML of a gallery with two images,
4943          * labeled 'The number "1"' and
4944          * 'A tree'.
4945          *
4946          * @param string $text
4947          * @param array $params
4948          * @return string HTML
4949          */
4950         public function renderImageGallery( $text, $params ) {
4951
4952                 $mode = false;
4953                 if ( isset( $params['mode'] ) ) {
4954                         $mode = $params['mode'];
4955                 }
4956
4957                 try {
4958                         $ig = ImageGalleryBase::factory( $mode );
4959                 } catch ( Exception $e ) {
4960                         // If invalid type set, fallback to default.
4961                         $ig = ImageGalleryBase::factory( false );
4962                 }
4963
4964                 $ig->setContextTitle( $this->mTitle );
4965                 $ig->setShowBytes( false );
4966                 $ig->setShowFilename( false );
4967                 $ig->setParser( $this );
4968                 $ig->setHideBadImages();
4969                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4970
4971                 if ( isset( $params['showfilename'] ) ) {
4972                         $ig->setShowFilename( true );
4973                 } else {
4974                         $ig->setShowFilename( false );
4975                 }
4976                 if ( isset( $params['caption'] ) ) {
4977                         $caption = $params['caption'];
4978                         $caption = htmlspecialchars( $caption );
4979                         $caption = $this->replaceInternalLinks( $caption );
4980                         $ig->setCaptionHtml( $caption );
4981                 }
4982                 if ( isset( $params['perrow'] ) ) {
4983                         $ig->setPerRow( $params['perrow'] );
4984                 }
4985                 if ( isset( $params['widths'] ) ) {
4986                         $ig->setWidths( $params['widths'] );
4987                 }
4988                 if ( isset( $params['heights'] ) ) {
4989                         $ig->setHeights( $params['heights'] );
4990                 }
4991                 $ig->setAdditionalOptions( $params );
4992
4993                 // Avoid PHP 7.1 warning from passing $this by reference
4994                 $parser = $this;
4995                 Hooks::run( 'BeforeParserrenderImageGallery', [ &$parser, &$ig ] );
4996
4997                 $lines = StringUtils::explode( "\n", $text );
4998                 foreach ( $lines as $line ) {
4999                         # match lines like these:
5000                         # Image:someimage.jpg|This is some image
5001                         $matches = [];
5002                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
5003                         # Skip empty lines
5004                         if ( count( $matches ) == 0 ) {
5005                                 continue;
5006                         }
5007
5008                         if ( strpos( $matches[0], '%' ) !== false ) {
5009                                 $matches[1] = rawurldecode( $matches[1] );
5010                         }
5011                         $title = Title::newFromText( $matches[1], NS_FILE );
5012                         if ( is_null( $title ) ) {
5013                                 # Bogus title. Ignore these so we don't bomb out later.
5014                                 continue;
5015                         }
5016
5017                         # We need to get what handler the file uses, to figure out parameters.
5018                         # Note, a hook can overide the file name, and chose an entirely different
5019                         # file (which potentially could be of a different type and have different handler).
5020                         $options = [];
5021                         $descQuery = false;
5022                         Hooks::run( 'BeforeParserFetchFileAndTitle',
5023                                 [ $this, $title, &$options, &$descQuery ] );
5024                         # Don't register it now, as TraditionalImageGallery does that later.
5025                         $file = $this->fetchFileNoRegister( $title, $options );
5026                         $handler = $file ? $file->getHandler() : false;
5027
5028                         $paramMap = [
5029                                 'img_alt' => 'gallery-internal-alt',
5030                                 'img_link' => 'gallery-internal-link',
5031                         ];
5032                         if ( $handler ) {
5033                                 $paramMap = $paramMap + $handler->getParamMap();
5034                                 // We don't want people to specify per-image widths.
5035                                 // Additionally the width parameter would need special casing anyhow.
5036                                 unset( $paramMap['img_width'] );
5037                         }
5038
5039                         $mwArray = new MagicWordArray( array_keys( $paramMap ) );
5040
5041                         $label = '';
5042                         $alt = '';
5043                         $link = '';
5044                         $handlerOptions = [];
5045                         if ( isset( $matches[3] ) ) {
5046                                 // look for an |alt= definition while trying not to break existing
5047                                 // captions with multiple pipes (|) in it, until a more sensible grammar
5048                                 // is defined for images in galleries
5049
5050                                 // FIXME: Doing recursiveTagParse at this stage, and the trim before
5051                                 // splitting on '|' is a bit odd, and different from makeImage.
5052                                 $matches[3] = $this->recursiveTagParse( trim( $matches[3] ) );
5053                                 // Protect LanguageConverter markup
5054                                 $parameterMatches = StringUtils::delimiterExplode(
5055                                         '-{', '}-', '|', $matches[3], true /* nested */
5056                                 );
5057
5058                                 foreach ( $parameterMatches as $parameterMatch ) {
5059                                         list( $magicName, $match ) = $mwArray->matchVariableStartToEnd( $parameterMatch );
5060                                         if ( $magicName ) {
5061                                                 $paramName = $paramMap[$magicName];
5062
5063                                                 switch ( $paramName ) {
5064                                                 case 'gallery-internal-alt':
5065                                                         $alt = $this->stripAltText( $match, false );
5066                                                         break;
5067                                                 case 'gallery-internal-link':
5068                                                         $linkValue = strip_tags( $this->replaceLinkHoldersText( $match ) );
5069                                                         $chars = self::EXT_LINK_URL_CLASS;
5070                                                         $addr = self::EXT_LINK_ADDR;
5071                                                         $prots = $this->mUrlProtocols;
5072                                                         // check to see if link matches an absolute url, if not then it must be a wiki link.
5073                                                         if ( preg_match( '/^-{R|(.*)}-$/', $linkValue ) ) {
5074                                                                 // Result of LanguageConverter::markNoConversion
5075                                                                 // invoked on an external link.
5076                                                                 $linkValue = substr( $linkValue, 4, -2 );
5077                                                         }
5078                                                         if ( preg_match( "/^($prots)$addr$chars*$/u", $linkValue ) ) {
5079                                                                 $link = $linkValue;
5080                                                         } else {
5081                                                                 $localLinkTitle = Title::newFromText( $linkValue );
5082                                                                 if ( $localLinkTitle !== null ) {
5083                                                                         $link = $localLinkTitle->getLinkURL();
5084                                                                 }
5085                                                         }
5086                                                         break;
5087                                                 default:
5088                                                         // Must be a handler specific parameter.
5089                                                         if ( $handler->validateParam( $paramName, $match ) ) {
5090                                                                 $handlerOptions[$paramName] = $match;
5091                                                         } else {
5092                                                                 // Guess not, consider it as caption.
5093                                                                 wfDebug( "$parameterMatch failed parameter validation\n" );
5094                                                                 $label = '|' . $parameterMatch;
5095                                                         }
5096                                                 }
5097
5098                                         } else {
5099                                                 // Last pipe wins.
5100                                                 $label = '|' . $parameterMatch;
5101                                         }
5102                                 }
5103                                 // Remove the pipe.
5104                                 $label = substr( $label, 1 );
5105                         }
5106
5107                         $ig->add( $title, $label, $alt, $link, $handlerOptions );
5108                 }
5109                 $html = $ig->toHTML();
5110                 Hooks::run( 'AfterParserFetchFileAndTitle', [ $this, $ig, &$html ] );
5111                 return $html;
5112         }
5113
5114         /**
5115          * @param MediaHandler $handler
5116          * @return array
5117          */
5118         public function getImageParams( $handler ) {
5119                 if ( $handler ) {
5120                         $handlerClass = get_class( $handler );
5121                 } else {
5122                         $handlerClass = '';
5123                 }
5124                 if ( !isset( $this->mImageParams[$handlerClass] ) ) {
5125                         # Initialise static lists
5126                         static $internalParamNames = [
5127                                 'horizAlign' => [ 'left', 'right', 'center', 'none' ],
5128                                 'vertAlign' => [ 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
5129                                         'bottom', 'text-bottom' ],
5130                                 'frame' => [ 'thumbnail', 'manualthumb', 'framed', 'frameless',
5131                                         'upright', 'border', 'link', 'alt', 'class' ],
5132                         ];
5133                         static $internalParamMap;
5134                         if ( !$internalParamMap ) {
5135                                 $internalParamMap = [];
5136                                 foreach ( $internalParamNames as $type => $names ) {
5137                                         foreach ( $names as $name ) {
5138                                                 $magicName = str_replace( '-', '_', "img_$name" );
5139                                                 $internalParamMap[$magicName] = [ $type, $name ];
5140                                         }
5141                                 }
5142                         }
5143
5144                         # Add handler params
5145                         $paramMap = $internalParamMap;
5146                         if ( $handler ) {
5147                                 $handlerParamMap = $handler->getParamMap();
5148                                 foreach ( $handlerParamMap as $magic => $paramName ) {
5149                                         $paramMap[$magic] = [ 'handler', $paramName ];
5150                                 }
5151                         }
5152                         $this->mImageParams[$handlerClass] = $paramMap;
5153                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
5154                 }
5155                 return [ $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] ];
5156         }
5157
5158         /**
5159          * Parse image options text and use it to make an image
5160          *
5161          * @param Title $title
5162          * @param string $options
5163          * @param LinkHolderArray|bool $holders
5164          * @return string HTML
5165          */
5166         public function makeImage( $title, $options, $holders = false ) {
5167                 # Check if the options text is of the form "options|alt text"
5168                 # Options are:
5169                 #  * thumbnail  make a thumbnail with enlarge-icon and caption, alignment depends on lang
5170                 #  * left       no resizing, just left align. label is used for alt= only
5171                 #  * right      same, but right aligned
5172                 #  * none       same, but not aligned
5173                 #  * ___px      scale to ___ pixels width, no aligning. e.g. use in taxobox
5174                 #  * center     center the image
5175                 #  * frame      Keep original image size, no magnify-button.
5176                 #  * framed     Same as "frame"
5177                 #  * frameless  like 'thumb' but without a frame. Keeps user preferences for width
5178                 #  * upright    reduce width for upright images, rounded to full __0 px
5179                 #  * border     draw a 1px border around the image
5180                 #  * alt        Text for HTML alt attribute (defaults to empty)
5181                 #  * class      Set a class for img node
5182                 #  * link       Set the target of the image link. Can be external, interwiki, or local
5183                 # vertical-align values (no % or length right now):
5184                 #  * baseline
5185                 #  * sub
5186                 #  * super
5187                 #  * top
5188                 #  * text-top
5189                 #  * middle
5190                 #  * bottom
5191                 #  * text-bottom
5192
5193                 # Protect LanguageConverter markup when splitting into parts
5194                 $parts = StringUtils::delimiterExplode(
5195                         '-{', '}-', '|', $options, true /* allow nesting */
5196                 );
5197
5198                 # Give extensions a chance to select the file revision for us
5199                 $options = [];
5200                 $descQuery = false;
5201                 Hooks::run( 'BeforeParserFetchFileAndTitle',
5202                         [ $this, $title, &$options, &$descQuery ] );
5203                 # Fetch and register the file (file title may be different via hooks)
5204                 list( $file, $title ) = $this->fetchFileAndTitle( $title, $options );
5205
5206                 # Get parameter map
5207                 $handler = $file ? $file->getHandler() : false;
5208
5209                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
5210
5211                 if ( !$file ) {
5212                         $this->addTrackingCategory( 'broken-file-category' );
5213                 }
5214
5215                 # Process the input parameters
5216                 $caption = '';
5217                 $params = [ 'frame' => [], 'handler' => [],
5218                         'horizAlign' => [], 'vertAlign' => [] ];
5219                 $seenformat = false;
5220                 foreach ( $parts as $part ) {
5221                         $part = trim( $part );
5222                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
5223                         $validated = false;
5224                         if ( isset( $paramMap[$magicName] ) ) {
5225                                 list( $type, $paramName ) = $paramMap[$magicName];
5226
5227                                 # Special case; width and height come in one variable together
5228                                 if ( $type === 'handler' && $paramName === 'width' ) {
5229                                         $parsedWidthParam = $this->parseWidthParam( $value );
5230                                         if ( isset( $parsedWidthParam['width'] ) ) {
5231                                                 $width = $parsedWidthParam['width'];
5232                                                 if ( $handler->validateParam( 'width', $width ) ) {
5233                                                         $params[$type]['width'] = $width;
5234                                                         $validated = true;
5235                                                 }
5236                                         }
5237                                         if ( isset( $parsedWidthParam['height'] ) ) {
5238                                                 $height = $parsedWidthParam['height'];
5239                                                 if ( $handler->validateParam( 'height', $height ) ) {
5240                                                         $params[$type]['height'] = $height;
5241                                                         $validated = true;
5242                                                 }
5243                                         }
5244                                         # else no validation -- T15436
5245                                 } else {
5246                                         if ( $type === 'handler' ) {
5247                                                 # Validate handler parameter
5248                                                 $validated = $handler->validateParam( $paramName, $value );
5249                                         } else {
5250                                                 # Validate internal parameters
5251                                                 switch ( $paramName ) {
5252                                                 case 'manualthumb':
5253                                                 case 'alt':
5254                                                 case 'class':
5255                                                         # @todo FIXME: Possibly check validity here for
5256                                                         # manualthumb? downstream behavior seems odd with
5257                                                         # missing manual thumbs.
5258                                                         $validated = true;
5259                                                         $value = $this->stripAltText( $value, $holders );
5260                                                         break;
5261                                                 case 'link':
5262                                                         $chars = self::EXT_LINK_URL_CLASS;
5263                                                         $addr = self::EXT_LINK_ADDR;
5264                                                         $prots = $this->mUrlProtocols;
5265                                                         if ( $value === '' ) {
5266                                                                 $paramName = 'no-link';
5267                                                                 $value = true;
5268                                                                 $validated = true;
5269                                                         } elseif ( preg_match( "/^((?i)$prots)/", $value ) ) {
5270                                                                 if ( preg_match( "/^((?i)$prots)$addr$chars*$/u", $value, $m ) ) {
5271                                                                         $paramName = 'link-url';
5272                                                                         $this->mOutput->addExternalLink( $value );
5273                                                                         if ( $this->mOptions->getExternalLinkTarget() ) {
5274                                                                                 $params[$type]['link-target'] = $this->mOptions->getExternalLinkTarget();
5275                                                                         }
5276                                                                         $validated = true;
5277                                                                 }
5278                                                         } else {
5279                                                                 $linkTitle = Title::newFromText( $value );
5280                                                                 if ( $linkTitle ) {
5281                                                                         $paramName = 'link-title';
5282                                                                         $value = $linkTitle;
5283                                                                         $this->mOutput->addLink( $linkTitle );
5284                                                                         $validated = true;
5285                                                                 }
5286                                                         }
5287                                                         break;
5288                                                 case 'frameless':
5289                                                 case 'framed':
5290                                                 case 'thumbnail':
5291                                                         // use first appearing option, discard others.
5292                                                         $validated = !$seenformat;
5293                                                         $seenformat = true;
5294                                                         break;
5295                                                 default:
5296                                                         # Most other things appear to be empty or numeric...
5297                                                         $validated = ( $value === false || is_numeric( trim( $value ) ) );
5298                                                 }
5299                                         }
5300
5301                                         if ( $validated ) {
5302                                                 $params[$type][$paramName] = $value;
5303                                         }
5304                                 }
5305                         }
5306                         if ( !$validated ) {
5307                                 $caption = $part;
5308                         }
5309                 }
5310
5311                 # Process alignment parameters
5312                 if ( $params['horizAlign'] ) {
5313                         $params['frame']['align'] = key( $params['horizAlign'] );
5314                 }
5315                 if ( $params['vertAlign'] ) {
5316                         $params['frame']['valign'] = key( $params['vertAlign'] );
5317                 }
5318
5319                 $params['frame']['caption'] = $caption;
5320
5321                 # Will the image be presented in a frame, with the caption below?
5322                 $imageIsFramed = isset( $params['frame']['frame'] )
5323                         || isset( $params['frame']['framed'] )
5324                         || isset( $params['frame']['thumbnail'] )
5325                         || isset( $params['frame']['manualthumb'] );
5326
5327                 # In the old days, [[Image:Foo|text...]] would set alt text.  Later it
5328                 # came to also set the caption, ordinary text after the image -- which
5329                 # makes no sense, because that just repeats the text multiple times in
5330                 # screen readers.  It *also* came to set the title attribute.
5331                 # Now that we have an alt attribute, we should not set the alt text to
5332                 # equal the caption: that's worse than useless, it just repeats the
5333                 # text.  This is the framed/thumbnail case.  If there's no caption, we
5334                 # use the unnamed parameter for alt text as well, just for the time be-
5335                 # ing, if the unnamed param is set and the alt param is not.
5336                 # For the future, we need to figure out if we want to tweak this more,
5337                 # e.g., introducing a title= parameter for the title; ignoring the un-
5338                 # named parameter entirely for images without a caption; adding an ex-
5339                 # plicit caption= parameter and preserving the old magic unnamed para-
5340                 # meter for BC; ...
5341                 if ( $imageIsFramed ) { # Framed image
5342                         if ( $caption === '' && !isset( $params['frame']['alt'] ) ) {
5343                                 # No caption or alt text, add the filename as the alt text so
5344                                 # that screen readers at least get some description of the image
5345                                 $params['frame']['alt'] = $title->getText();
5346                         }
5347                         # Do not set $params['frame']['title'] because tooltips don't make sense
5348                         # for framed images
5349                 } else { # Inline image
5350                         if ( !isset( $params['frame']['alt'] ) ) {
5351                                 # No alt text, use the "caption" for the alt text
5352                                 if ( $caption !== '' ) {
5353                                         $params['frame']['alt'] = $this->stripAltText( $caption, $holders );
5354                                 } else {
5355                                         # No caption, fall back to using the filename for the
5356                                         # alt text
5357                                         $params['frame']['alt'] = $title->getText();
5358                                 }
5359                         }
5360                         # Use the "caption" for the tooltip text
5361                         $params['frame']['title'] = $this->stripAltText( $caption, $holders );
5362                 }
5363
5364                 Hooks::run( 'ParserMakeImageParams', [ $title, $file, &$params, $this ] );
5365
5366                 # Linker does the rest
5367                 $time = isset( $options['time'] ) ? $options['time'] : false;
5368                 $ret = Linker::makeImageLink( $this, $title, $file, $params['frame'], $params['handler'],
5369                         $time, $descQuery, $this->mOptions->getThumbSize() );
5370
5371                 # Give the handler a chance to modify the parser object
5372                 if ( $handler ) {
5373                         $handler->parserTransformHook( $this, $file );
5374                 }
5375
5376                 return $ret;
5377         }
5378
5379         /**
5380          * @param string $caption
5381          * @param LinkHolderArray|bool $holders
5382          * @return mixed|string
5383          */
5384         protected function stripAltText( $caption, $holders ) {
5385                 # Strip bad stuff out of the title (tooltip).  We can't just use
5386                 # replaceLinkHoldersText() here, because if this function is called
5387                 # from replaceInternalLinks2(), mLinkHolders won't be up-to-date.
5388                 if ( $holders ) {
5389                         $tooltip = $holders->replaceText( $caption );
5390                 } else {
5391                         $tooltip = $this->replaceLinkHoldersText( $caption );
5392                 }
5393
5394                 # make sure there are no placeholders in thumbnail attributes
5395                 # that are later expanded to html- so expand them now and
5396                 # remove the tags
5397                 $tooltip = $this->mStripState->unstripBoth( $tooltip );
5398                 $tooltip = Sanitizer::stripAllTags( $tooltip );
5399
5400                 return $tooltip;
5401         }
5402
5403         /**
5404          * Set a flag in the output object indicating that the content is dynamic and
5405          * shouldn't be cached.
5406          * @deprecated since 1.28; use getOutput()->updateCacheExpiry()
5407          */
5408         public function disableCache() {
5409                 wfDebug( "Parser output marked as uncacheable.\n" );
5410                 if ( !$this->mOutput ) {
5411                         throw new MWException( __METHOD__ .
5412                                 " can only be called when actually parsing something" );
5413                 }
5414                 $this->mOutput->updateCacheExpiry( 0 ); // new style, for consistency
5415         }
5416
5417         /**
5418          * Callback from the Sanitizer for expanding items found in HTML attribute
5419          * values, so they can be safely tested and escaped.
5420          *
5421          * @param string $text
5422          * @param bool|PPFrame $frame
5423          * @return string
5424          */
5425         public function attributeStripCallback( &$text, $frame = false ) {
5426                 $text = $this->replaceVariables( $text, $frame );
5427                 $text = $this->mStripState->unstripBoth( $text );
5428                 return $text;
5429         }
5430
5431         /**
5432          * Accessor
5433          *
5434          * @return array
5435          */
5436         public function getTags() {
5437                 return array_merge(
5438                         array_keys( $this->mTransparentTagHooks ),
5439                         array_keys( $this->mTagHooks ),
5440                         array_keys( $this->mFunctionTagHooks )
5441                 );
5442         }
5443
5444         /**
5445          * Replace transparent tags in $text with the values given by the callbacks.
5446          *
5447          * Transparent tag hooks are like regular XML-style tag hooks, except they
5448          * operate late in the transformation sequence, on HTML instead of wikitext.
5449          *
5450          * @param string $text
5451          *
5452          * @return string
5453          */
5454         public function replaceTransparentTags( $text ) {
5455                 $matches = [];
5456                 $elements = array_keys( $this->mTransparentTagHooks );
5457                 $text = self::extractTagsAndParams( $elements, $text, $matches );
5458                 $replacements = [];
5459
5460                 foreach ( $matches as $marker => $data ) {
5461                         list( $element, $content, $params, $tag ) = $data;
5462                         $tagName = strtolower( $element );
5463                         if ( isset( $this->mTransparentTagHooks[$tagName] ) ) {
5464                                 $output = call_user_func_array(
5465                                         $this->mTransparentTagHooks[$tagName],
5466                                         [ $content, $params, $this ]
5467                                 );
5468                         } else {
5469                                 $output = $tag;
5470                         }
5471                         $replacements[$marker] = $output;
5472                 }
5473                 return strtr( $text, $replacements );
5474         }
5475
5476         /**
5477          * Break wikitext input into sections, and either pull or replace
5478          * some particular section's text.
5479          *
5480          * External callers should use the getSection and replaceSection methods.
5481          *
5482          * @param string $text Page wikitext
5483          * @param string|int $sectionId A section identifier string of the form:
5484          *   "<flag1> - <flag2> - ... - <section number>"
5485          *
5486          * Currently the only recognised flag is "T", which means the target section number
5487          * was derived during a template inclusion parse, in other words this is a template
5488          * section edit link. If no flags are given, it was an ordinary section edit link.
5489          * This flag is required to avoid a section numbering mismatch when a section is
5490          * enclosed by "<includeonly>" (T8563).
5491          *
5492          * The section number 0 pulls the text before the first heading; other numbers will
5493          * pull the given section along with its lower-level subsections. If the section is
5494          * not found, $mode=get will return $newtext, and $mode=replace will return $text.
5495          *
5496          * Section 0 is always considered to exist, even if it only contains the empty
5497          * string. If $text is the empty string and section 0 is replaced, $newText is
5498          * returned.
5499          *
5500          * @param string $mode One of "get" or "replace"
5501          * @param string $newText Replacement text for section data.
5502          * @return string For "get", the extracted section text.
5503          *   for "replace", the whole page with the section replaced.
5504          */
5505         private function extractSections( $text, $sectionId, $mode, $newText = '' ) {
5506                 global $wgTitle; # not generally used but removes an ugly failure mode
5507
5508                 $magicScopeVariable = $this->lock();
5509                 $this->startParse( $wgTitle, new ParserOptions, self::OT_PLAIN, true );
5510                 $outText = '';
5511                 $frame = $this->getPreprocessor()->newFrame();
5512
5513                 # Process section extraction flags
5514                 $flags = 0;
5515                 $sectionParts = explode( '-', $sectionId );
5516                 $sectionIndex = array_pop( $sectionParts );
5517                 foreach ( $sectionParts as $part ) {
5518                         if ( $part === 'T' ) {
5519                                 $flags |= self::PTD_FOR_INCLUSION;
5520                         }
5521                 }
5522
5523                 # Check for empty input
5524                 if ( strval( $text ) === '' ) {
5525                         # Only sections 0 and T-0 exist in an empty document
5526                         if ( $sectionIndex == 0 ) {
5527                                 if ( $mode === 'get' ) {
5528                                         return '';
5529                                 } else {
5530                                         return $newText;
5531                                 }
5532                         } else {
5533                                 if ( $mode === 'get' ) {
5534                                         return $newText;
5535                                 } else {
5536                                         return $text;
5537                                 }
5538                         }
5539                 }
5540
5541                 # Preprocess the text
5542                 $root = $this->preprocessToDom( $text, $flags );
5543
5544                 # <h> nodes indicate section breaks
5545                 # They can only occur at the top level, so we can find them by iterating the root's children
5546                 $node = $root->getFirstChild();
5547
5548                 # Find the target section
5549                 if ( $sectionIndex == 0 ) {
5550                         # Section zero doesn't nest, level=big
5551                         $targetLevel = 1000;
5552                 } else {
5553                         while ( $node ) {
5554                                 if ( $node->getName() === 'h' ) {
5555                                         $bits = $node->splitHeading();
5556                                         if ( $bits['i'] == $sectionIndex ) {
5557                                                 $targetLevel = $bits['level'];
5558                                                 break;
5559                                         }
5560                                 }
5561                                 if ( $mode === 'replace' ) {
5562                                         $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
5563                                 }
5564                                 $node = $node->getNextSibling();
5565                         }
5566                 }
5567
5568                 if ( !$node ) {
5569                         # Not found
5570                         if ( $mode === 'get' ) {
5571                                 return $newText;
5572                         } else {
5573                                 return $text;
5574                         }
5575                 }
5576
5577                 # Find the end of the section, including nested sections
5578                 do {
5579                         if ( $node->getName() === 'h' ) {
5580                                 $bits = $node->splitHeading();
5581                                 $curLevel = $bits['level'];
5582                                 if ( $bits['i'] != $sectionIndex && $curLevel <= $targetLevel ) {
5583                                         break;
5584                                 }
5585                         }
5586                         if ( $mode === 'get' ) {
5587                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
5588                         }
5589                         $node = $node->getNextSibling();
5590                 } while ( $node );
5591
5592                 # Write out the remainder (in replace mode only)
5593                 if ( $mode === 'replace' ) {
5594                         # Output the replacement text
5595                         # Add two newlines on -- trailing whitespace in $newText is conventionally
5596                         # stripped by the editor, so we need both newlines to restore the paragraph gap
5597                         # Only add trailing whitespace if there is newText
5598                         if ( $newText != "" ) {
5599                                 $outText .= $newText . "\n\n";
5600                         }
5601
5602                         while ( $node ) {
5603                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
5604                                 $node = $node->getNextSibling();
5605                         }
5606                 }
5607
5608                 if ( is_string( $outText ) ) {
5609                         # Re-insert stripped tags
5610                         $outText = rtrim( $this->mStripState->unstripBoth( $outText ) );
5611                 }
5612
5613                 return $outText;
5614         }
5615
5616         /**
5617          * This function returns the text of a section, specified by a number ($section).
5618          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
5619          * the first section before any such heading (section 0).
5620          *
5621          * If a section contains subsections, these are also returned.
5622          *
5623          * @param string $text Text to look in
5624          * @param string|int $sectionId Section identifier as a number or string
5625          * (e.g. 0, 1 or 'T-1').
5626          * @param string $defaultText Default to return if section is not found
5627          *
5628          * @return string Text of the requested section
5629          */
5630         public function getSection( $text, $sectionId, $defaultText = '' ) {
5631                 return $this->extractSections( $text, $sectionId, 'get', $defaultText );
5632         }
5633
5634         /**
5635          * This function returns $oldtext after the content of the section
5636          * specified by $section has been replaced with $text. If the target
5637          * section does not exist, $oldtext is returned unchanged.
5638          *
5639          * @param string $oldText Former text of the article
5640          * @param string|int $sectionId Section identifier as a number or string
5641          * (e.g. 0, 1 or 'T-1').
5642          * @param string $newText Replacing text
5643          *
5644          * @return string Modified text
5645          */
5646         public function replaceSection( $oldText, $sectionId, $newText ) {
5647                 return $this->extractSections( $oldText, $sectionId, 'replace', $newText );
5648         }
5649
5650         /**
5651          * Get the ID of the revision we are parsing
5652          *
5653          * @return int|null
5654          */
5655         public function getRevisionId() {
5656                 return $this->mRevisionId;
5657         }
5658
5659         /**
5660          * Get the revision object for $this->mRevisionId
5661          *
5662          * @return Revision|null Either a Revision object or null
5663          * @since 1.23 (public since 1.23)
5664          */
5665         public function getRevisionObject() {
5666                 if ( !is_null( $this->mRevisionObject ) ) {
5667                         return $this->mRevisionObject;
5668                 }
5669                 if ( is_null( $this->mRevisionId ) ) {
5670                         return null;
5671                 }
5672
5673                 $rev = call_user_func(
5674                         $this->mOptions->getCurrentRevisionCallback(), $this->getTitle(), $this
5675                 );
5676
5677                 # If the parse is for a new revision, then the callback should have
5678                 # already been set to force the object and should match mRevisionId.
5679                 # If not, try to fetch by mRevisionId for sanity.
5680                 if ( $rev && $rev->getId() != $this->mRevisionId ) {
5681                         $rev = Revision::newFromId( $this->mRevisionId );
5682                 }
5683
5684                 $this->mRevisionObject = $rev;
5685
5686                 return $this->mRevisionObject;
5687         }
5688
5689         /**
5690          * Get the timestamp associated with the current revision, adjusted for
5691          * the default server-local timestamp
5692          * @return string
5693          */
5694         public function getRevisionTimestamp() {
5695                 if ( is_null( $this->mRevisionTimestamp ) ) {
5696                         global $wgContLang;
5697
5698                         $revObject = $this->getRevisionObject();
5699                         $timestamp = $revObject ? $revObject->getTimestamp() : wfTimestampNow();
5700
5701                         # The cryptic '' timezone parameter tells to use the site-default
5702                         # timezone offset instead of the user settings.
5703                         # Since this value will be saved into the parser cache, served
5704                         # to other users, and potentially even used inside links and such,
5705                         # it needs to be consistent for all visitors.
5706                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
5707
5708                 }
5709                 return $this->mRevisionTimestamp;
5710         }
5711
5712         /**
5713          * Get the name of the user that edited the last revision
5714          *
5715          * @return string User name
5716          */
5717         public function getRevisionUser() {
5718                 if ( is_null( $this->mRevisionUser ) ) {
5719                         $revObject = $this->getRevisionObject();
5720
5721                         # if this template is subst: the revision id will be blank,
5722                         # so just use the current user's name
5723                         if ( $revObject ) {
5724                                 $this->mRevisionUser = $revObject->getUserText();
5725                         } elseif ( $this->ot['wiki'] || $this->mOptions->getIsPreview() ) {
5726                                 $this->mRevisionUser = $this->getUser()->getName();
5727                         }
5728                 }
5729                 return $this->mRevisionUser;
5730         }
5731
5732         /**
5733          * Get the size of the revision
5734          *
5735          * @return int|null Revision size
5736          */
5737         public function getRevisionSize() {
5738                 if ( is_null( $this->mRevisionSize ) ) {
5739                         $revObject = $this->getRevisionObject();
5740
5741                         # if this variable is subst: the revision id will be blank,
5742                         # so just use the parser input size, because the own substituation
5743                         # will change the size.
5744                         if ( $revObject ) {
5745                                 $this->mRevisionSize = $revObject->getSize();
5746                         } else {
5747                                 $this->mRevisionSize = $this->mInputSize;
5748                         }
5749                 }
5750                 return $this->mRevisionSize;
5751         }
5752
5753         /**
5754          * Mutator for $mDefaultSort
5755          *
5756          * @param string $sort New value
5757          */
5758         public function setDefaultSort( $sort ) {
5759                 $this->mDefaultSort = $sort;
5760                 $this->mOutput->setProperty( 'defaultsort', $sort );
5761         }
5762
5763         /**
5764          * Accessor for $mDefaultSort
5765          * Will use the empty string if none is set.
5766          *
5767          * This value is treated as a prefix, so the
5768          * empty string is equivalent to sorting by
5769          * page name.
5770          *
5771          * @return string
5772          */
5773         public function getDefaultSort() {
5774                 if ( $this->mDefaultSort !== false ) {
5775                         return $this->mDefaultSort;
5776                 } else {
5777                         return '';
5778                 }
5779         }
5780
5781         /**
5782          * Accessor for $mDefaultSort
5783          * Unlike getDefaultSort(), will return false if none is set
5784          *
5785          * @return string|bool
5786          */
5787         public function getCustomDefaultSort() {
5788                 return $this->mDefaultSort;
5789         }
5790
5791         /**
5792          * Try to guess the section anchor name based on a wikitext fragment
5793          * presumably extracted from a heading, for example "Header" from
5794          * "== Header ==".
5795          *
5796          * @param string $text
5797          *
5798          * @return string
5799          */
5800         public function guessSectionNameFromWikiText( $text ) {
5801                 # Strip out wikitext links(they break the anchor)
5802                 $text = $this->stripSectionName( $text );
5803                 $text = Sanitizer::normalizeSectionNameWhitespace( $text );
5804                 return '#' . Sanitizer::escapeId( $text, 'noninitial' );
5805         }
5806
5807         /**
5808          * Same as guessSectionNameFromWikiText(), but produces legacy anchors
5809          * instead.  For use in redirects, since IE6 interprets Redirect: headers
5810          * as something other than UTF-8 (apparently?), resulting in breakage.
5811          *
5812          * @param string $text The section name
5813          * @return string An anchor
5814          */
5815         public function guessLegacySectionNameFromWikiText( $text ) {
5816                 # Strip out wikitext links(they break the anchor)
5817                 $text = $this->stripSectionName( $text );
5818                 $text = Sanitizer::normalizeSectionNameWhitespace( $text );
5819                 return '#' . Sanitizer::escapeId( $text, [ 'noninitial', 'legacy' ] );
5820         }
5821
5822         /**
5823          * Strips a text string of wikitext for use in a section anchor
5824          *
5825          * Accepts a text string and then removes all wikitext from the
5826          * string and leaves only the resultant text (i.e. the result of
5827          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
5828          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
5829          * to create valid section anchors by mimicing the output of the
5830          * parser when headings are parsed.
5831          *
5832          * @param string $text Text string to be stripped of wikitext
5833          * for use in a Section anchor
5834          * @return string Filtered text string
5835          */
5836         public function stripSectionName( $text ) {
5837                 # Strip internal link markup
5838                 $text = preg_replace( '/\[\[:?([^[|]+)\|([^[]+)\]\]/', '$2', $text );
5839                 $text = preg_replace( '/\[\[:?([^[]+)\|?\]\]/', '$1', $text );
5840
5841                 # Strip external link markup
5842                 # @todo FIXME: Not tolerant to blank link text
5843                 # I.E. [https://www.mediawiki.org] will render as [1] or something depending
5844                 # on how many empty links there are on the page - need to figure that out.
5845                 $text = preg_replace( '/\[(?i:' . $this->mUrlProtocols . ')([^ ]+?) ([^[]+)\]/', '$2', $text );
5846
5847                 # Parse wikitext quotes (italics & bold)
5848                 $text = $this->doQuotes( $text );
5849
5850                 # Strip HTML tags
5851                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
5852                 return $text;
5853         }
5854
5855         /**
5856          * strip/replaceVariables/unstrip for preprocessor regression testing
5857          *
5858          * @param string $text
5859          * @param Title $title
5860          * @param ParserOptions $options
5861          * @param int $outputType
5862          *
5863          * @return string
5864          */
5865         public function testSrvus( $text, Title $title, ParserOptions $options,
5866                 $outputType = self::OT_HTML
5867         ) {
5868                 $magicScopeVariable = $this->lock();
5869                 $this->startParse( $title, $options, $outputType, true );
5870
5871                 $text = $this->replaceVariables( $text );
5872                 $text = $this->mStripState->unstripBoth( $text );
5873                 $text = Sanitizer::removeHTMLtags( $text );
5874                 return $text;
5875         }
5876
5877         /**
5878          * @param string $text
5879          * @param Title $title
5880          * @param ParserOptions $options
5881          * @return string
5882          */
5883         public function testPst( $text, Title $title, ParserOptions $options ) {
5884                 return $this->preSaveTransform( $text, $title, $options->getUser(), $options );
5885         }
5886
5887         /**
5888          * @param string $text
5889          * @param Title $title
5890          * @param ParserOptions $options
5891          * @return string
5892          */
5893         public function testPreprocess( $text, Title $title, ParserOptions $options ) {
5894                 return $this->testSrvus( $text, $title, $options, self::OT_PREPROCESS );
5895         }
5896
5897         /**
5898          * Call a callback function on all regions of the given text that are not
5899          * inside strip markers, and replace those regions with the return value
5900          * of the callback. For example, with input:
5901          *
5902          *  aaa<MARKER>bbb
5903          *
5904          * This will call the callback function twice, with 'aaa' and 'bbb'. Those
5905          * two strings will be replaced with the value returned by the callback in
5906          * each case.
5907          *
5908          * @param string $s
5909          * @param callable $callback
5910          *
5911          * @return string
5912          */
5913         public function markerSkipCallback( $s, $callback ) {
5914                 $i = 0;
5915                 $out = '';
5916                 while ( $i < strlen( $s ) ) {
5917                         $markerStart = strpos( $s, self::MARKER_PREFIX, $i );
5918                         if ( $markerStart === false ) {
5919                                 $out .= call_user_func( $callback, substr( $s, $i ) );
5920                                 break;
5921                         } else {
5922                                 $out .= call_user_func( $callback, substr( $s, $i, $markerStart - $i ) );
5923                                 $markerEnd = strpos( $s, self::MARKER_SUFFIX, $markerStart );
5924                                 if ( $markerEnd === false ) {
5925                                         $out .= substr( $s, $markerStart );
5926                                         break;
5927                                 } else {
5928                                         $markerEnd += strlen( self::MARKER_SUFFIX );
5929                                         $out .= substr( $s, $markerStart, $markerEnd - $markerStart );
5930                                         $i = $markerEnd;
5931                                 }
5932                         }
5933                 }
5934                 return $out;
5935         }
5936
5937         /**
5938          * Remove any strip markers found in the given text.
5939          *
5940          * @param string $text Input string
5941          * @return string
5942          */
5943         public function killMarkers( $text ) {
5944                 return $this->mStripState->killMarkers( $text );
5945         }
5946
5947         /**
5948          * Save the parser state required to convert the given half-parsed text to
5949          * HTML. "Half-parsed" in this context means the output of
5950          * recursiveTagParse() or internalParse(). This output has strip markers
5951          * from replaceVariables (extensionSubstitution() etc.), and link
5952          * placeholders from replaceLinkHolders().
5953          *
5954          * Returns an array which can be serialized and stored persistently. This
5955          * array can later be loaded into another parser instance with
5956          * unserializeHalfParsedText(). The text can then be safely incorporated into
5957          * the return value of a parser hook.
5958          *
5959          * @param string $text
5960          *
5961          * @return array
5962          */
5963         public function serializeHalfParsedText( $text ) {
5964                 $data = [
5965                         'text' => $text,
5966                         'version' => self::HALF_PARSED_VERSION,
5967                         'stripState' => $this->mStripState->getSubState( $text ),
5968                         'linkHolders' => $this->mLinkHolders->getSubArray( $text )
5969                 ];
5970                 return $data;
5971         }
5972
5973         /**
5974          * Load the parser state given in the $data array, which is assumed to
5975          * have been generated by serializeHalfParsedText(). The text contents is
5976          * extracted from the array, and its markers are transformed into markers
5977          * appropriate for the current Parser instance. This transformed text is
5978          * returned, and can be safely included in the return value of a parser
5979          * hook.
5980          *
5981          * If the $data array has been stored persistently, the caller should first
5982          * check whether it is still valid, by calling isValidHalfParsedText().
5983          *
5984          * @param array $data Serialized data
5985          * @throws MWException
5986          * @return string
5987          */
5988         public function unserializeHalfParsedText( $data ) {
5989                 if ( !isset( $data['version'] ) || $data['version'] != self::HALF_PARSED_VERSION ) {
5990                         throw new MWException( __METHOD__ . ': invalid version' );
5991                 }
5992
5993                 # First, extract the strip state.
5994                 $texts = [ $data['text'] ];
5995                 $texts = $this->mStripState->merge( $data['stripState'], $texts );
5996
5997                 # Now renumber links
5998                 $texts = $this->mLinkHolders->mergeForeign( $data['linkHolders'], $texts );
5999
6000                 # Should be good to go.
6001                 return $texts[0];
6002         }
6003
6004         /**
6005          * Returns true if the given array, presumed to be generated by
6006          * serializeHalfParsedText(), is compatible with the current version of the
6007          * parser.
6008          *
6009          * @param array $data
6010          *
6011          * @return bool
6012          */
6013         public function isValidHalfParsedText( $data ) {
6014                 return isset( $data['version'] ) && $data['version'] == self::HALF_PARSED_VERSION;
6015         }
6016
6017         /**
6018          * Parsed a width param of imagelink like 300px or 200x300px
6019          *
6020          * @param string $value
6021          *
6022          * @return array
6023          * @since 1.20
6024          */
6025         public function parseWidthParam( $value ) {
6026                 $parsedWidthParam = [];
6027                 if ( $value === '' ) {
6028                         return $parsedWidthParam;
6029                 }
6030                 $m = [];
6031                 # (T15500) In both cases (width/height and width only),
6032                 # permit trailing "px" for backward compatibility.
6033                 if ( preg_match( '/^([0-9]*)x([0-9]*)\s*(?:px)?\s*$/', $value, $m ) ) {
6034                         $width = intval( $m[1] );
6035                         $height = intval( $m[2] );
6036                         $parsedWidthParam['width'] = $width;
6037                         $parsedWidthParam['height'] = $height;
6038                 } elseif ( preg_match( '/^[0-9]*\s*(?:px)?\s*$/', $value ) ) {
6039                         $width = intval( $value );
6040                         $parsedWidthParam['width'] = $width;
6041                 }
6042                 return $parsedWidthParam;
6043         }
6044
6045         /**
6046          * Lock the current instance of the parser.
6047          *
6048          * This is meant to stop someone from calling the parser
6049          * recursively and messing up all the strip state.
6050          *
6051          * @throws MWException If parser is in a parse
6052          * @return ScopedCallback The lock will be released once the return value goes out of scope.
6053          */
6054         protected function lock() {
6055                 if ( $this->mInParse ) {
6056                         throw new MWException( "Parser state cleared while parsing. "
6057                                 . "Did you call Parser::parse recursively?" );
6058                 }
6059                 $this->mInParse = true;
6060
6061                 $recursiveCheck = new ScopedCallback( function() {
6062                         $this->mInParse = false;
6063                 } );
6064
6065                 return $recursiveCheck;
6066         }
6067
6068         /**
6069          * Strip outer <p></p> tag from the HTML source of a single paragraph.
6070          *
6071          * Returns original HTML if the <p/> tag has any attributes, if there's no wrapping <p/> tag,
6072          * or if there is more than one <p/> tag in the input HTML.
6073          *
6074          * @param string $html
6075          * @return string
6076          * @since 1.24
6077          */
6078         public static function stripOuterParagraph( $html ) {
6079                 $m = [];
6080                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?$/sU', $html, $m ) ) {
6081                         if ( strpos( $m[1], '</p>' ) === false ) {
6082                                 $html = $m[1];
6083                         }
6084                 }
6085
6086                 return $html;
6087         }
6088
6089         /**
6090          * Return this parser if it is not doing anything, otherwise
6091          * get a fresh parser. You can use this method by doing
6092          * $myParser = $wgParser->getFreshParser(), or more simply
6093          * $wgParser->getFreshParser()->parse( ... );
6094          * if you're unsure if $wgParser is safe to use.
6095          *
6096          * @since 1.24
6097          * @return Parser A parser object that is not parsing anything
6098          */
6099         public function getFreshParser() {
6100                 global $wgParserConf;
6101                 if ( $this->mInParse ) {
6102                         return new $wgParserConf['class']( $wgParserConf );
6103                 } else {
6104                         return $this;
6105                 }
6106         }
6107
6108         /**
6109          * Set's up the PHP implementation of OOUI for use in this request
6110          * and instructs OutputPage to enable OOUI for itself.
6111          *
6112          * @since 1.26
6113          */
6114         public function enableOOUI() {
6115                 OutputPage::setupOOUI();
6116                 $this->mOutput->setEnableOOUI( true );
6117         }
6118 }