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  * $wgMaxArticleSize
  67  *
  68  * @ingroup Parser
  69  */
  70 class Parser {
  71         /**
  72          * Update this version number when the ParserOutput format
  73          * changes in an incompatible way, so the parser cache
  74          * can automatically discard old data.
  75          */
  76         const VERSION = '1.6.4';
  77
  78         /**
  79          * Update this version number when the output of serialiseHalfParsedText()
  80          * changes in an incompatible way
  81          */
  82         const HALF_PARSED_VERSION = 2;
  83
  84         # Flags for Parser::setFunctionHook
  85         const SFH_NO_HASH = 1;
  86         const SFH_OBJECT_ARGS = 2;
  87
  88         # Constants needed for external link processing
  89         # Everything except bracket, space, or control characters
  90         # \p{Zs} is unicode 'separator, space' category. It covers the space 0x20
  91         # as well as U+3000 is IDEOGRAPHIC SPACE for T21052
  92         # \x{FFFD} is the Unicode replacement character, which Preprocessor_DOM
  93         # uses to replace invalid HTML characters.
  94         const EXT_LINK_URL_CLASS = '[^][<>"\\x00-\\x20\\x7F\p{Zs}\x{FFFD}]';
  95         # Simplified expression to match an IPv4 or IPv6 address, or
  96         # at least one character of a host name (embeds EXT_LINK_URL_CLASS)
  97         const EXT_LINK_ADDR = '(?:[0-9.]+|\\[(?i:[0-9a-f:.]+)\\]|[^][<>"\\x00-\\x20\\x7F\p{Zs}\x{FFFD}])';
  98         # RegExp to make image URLs (embeds IPv6 part of EXT_LINK_ADDR)
  99         // phpcs:ignore Generic.Files.LineLength
 100         const EXT_IMAGE_REGEX = '/^(http:\/\/|https:\/\/)((?:\\[(?i:[0-9a-f:.]+)\\])?[^][<>"\\x00-\\x20\\x7F\p{Zs}\x{FFFD}]+)
 101                 \\/([A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]+)\\.((?i)gif|png|jpg|jpeg)$/Sxu';
 102
 103         # Regular expression for a non-newline space
 104         const SPACE_NOT_NL = '(?:\t|&nbsp;|&\#0*160;|&\#[Xx]0*[Aa]0;|\p{Zs})';
 105
 106         # Flags for preprocessToDom
 107         const PTD_FOR_INCLUSION = 1;
 108
 109         # Allowed values for $this->mOutputType
 110         # Parameter to startExternalParse().
 111         const OT_HTML = 1; # like parse()
 112         const OT_WIKI = 2; # like preSaveTransform()
 113         const OT_PREPROCESS = 3; # like preprocess()
 114         const OT_MSG = 3;
 115         const OT_PLAIN = 4; # like extractSections() - portions of the original are returned unchanged.
 116
 117         /**
 118          * @var string Prefix and suffix for temporary replacement strings
 119          * for the multipass parser.
 120          *
 121          * \x7f should never appear in input as it's disallowed in XML.
 122          * Using it at the front also gives us a little extra robustness
 123          * since it shouldn't match when butted up against identifier-like
 124          * string constructs.
 125          *
 126          * Must not consist of all title characters, or else it will change
 127          * the behavior of <nowiki> in a link.
 128          *
 129          * Must have a character that needs escaping in attributes, otherwise
 130          * someone could put a strip marker in an attribute, to get around
 131          * escaping quote marks, and break out of the attribute. Thus we add
 132          * `'".
 133          */
 134         const MARKER_SUFFIX = "-QINU`\"'\x7f";
 135         const MARKER_PREFIX = "\x7f'\"`UNIQ-";
 136
 137         # Markers used for wrapping the table of contents
 138         const TOC_START = '<mw:toc>';
 139         const TOC_END = '</mw:toc>';
 140
 141         # Persistent:
 142         public $mTagHooks = [];
 143         public $mTransparentTagHooks = [];
 144         public $mFunctionHooks = [];
 145         public $mFunctionSynonyms = [ 0 => [], 1 => [] ];
 146         public $mFunctionTagHooks = [];
 147         public $mStripList = [];
 148         public $mDefaultStripList = [];
 149         public $mVarCache = [];
 150         public $mImageParams = [];
 151         public $mImageParamsMagicArray = [];
 152         public $mMarkerIndex = 0;
 153         public $mFirstCall = true;
 154
 155         # Initialised by initialiseVariables()
 156
 157         /**
 158          * @var MagicWordArray
 159          */
 160         public $mVariables;
 161
 162         /**
 163          * @var MagicWordArray
 164          */
 165         public $mSubstWords;
 166         # Initialised in constructor
 167         public $mConf, $mExtLinkBracketedRegex, $mUrlProtocols;
 168
 169         # Initialized in getPreprocessor()
 170         /** @var Preprocessor */
 171         public $mPreprocessor;
 172
 173         # Cleared with clearState():
 174         /**
 175          * @var ParserOutput
 176          */
 177         public $mOutput;
 178         public $mAutonumber;
 179
 180         /**
 181          * @var StripState
 182          */
 183         public $mStripState;
 184
 185         public $mIncludeCount;
 186         /**
 187          * @var LinkHolderArray
 188          */
 189         public $mLinkHolders;
 190
 191         public $mLinkID;
 192         public $mIncludeSizes, $mPPNodeCount, $mGeneratedPPNodeCount, $mHighestExpansionDepth;
 193         public $mDefaultSort;
 194         public $mTplRedirCache, $mTplDomCache, $mHeadings, $mDoubleUnderscores;
 195         public $mExpensiveFunctionCount; # number of expensive parser function calls
 196         public $mShowToc, $mForceTocPosition;
 197
 198         /**
 199          * @var User
 200          */
 201         public $mUser; # User object; only used when doing pre-save transform
 202
 203         # Temporary
 204         # These are variables reset at least once per parse regardless of $clearState
 205
 206         /**
 207          * @var ParserOptions
 208          */
 209         public $mOptions;
 210
 211         /**
 212          * @var Title
 213          */
 214         public $mTitle;        # Title context, used for self-link rendering and similar things
 215         public $mOutputType;   # Output type, one of the OT_xxx constants
 216         public $ot;            # Shortcut alias, see setOutputType()
 217         public $mRevisionObject; # The revision object of the specified revision ID
 218         public $mRevisionId;   # ID to display in {{REVISIONID}} tags
 219         public $mRevisionTimestamp; # The timestamp of the specified revision ID
 220         public $mRevisionUser; # User to display in {{REVISIONUSER}} tag
 221         public $mRevisionSize; # Size to display in {{REVISIONSIZE}} variable
 222         public $mRevIdForTs;   # The revision ID which was used to fetch the timestamp
 223         public $mInputSize = false; # For {{PAGESIZE}} on current page.
 224
 225         /**
 226          * @var string Deprecated accessor for the strip marker prefix.
 227          * @deprecated since 1.26; use Parser::MARKER_PREFIX instead.
 228          */
 229         public $mUniqPrefix = self::MARKER_PREFIX;
 230
 231         /**
 232          * @var array Array with the language name of each language link (i.e. the
 233          * interwiki prefix) in the key, value arbitrary. Used to avoid sending
 234          * duplicate language links to the ParserOutput.
 235          */
 236         public $mLangLinkLanguages;
 237
 238         /**
 239          * @var MapCacheLRU|null
 240          * @since 1.24
 241          *
 242          * A cache of the current revisions of titles. Keys are $title->getPrefixedDbKey()
 243          */
 244         public $currentRevisionCache;
 245
 246         /**
 247          * @var bool|string Recursive call protection.
 248          * This variable should be treated as if it were private.
 249          */
 250         public $mInParse = false;
 251
 252         /** @var SectionProfiler */
 253         protected $mProfiler;
 254
 255         /**
 256          * @var LinkRenderer
 257          */
 258         protected $mLinkRenderer;
 259
 260         /**
 261          * @param array $conf
 262          */
 263         public function __construct( $conf = [] ) {
 264                 $this->mConf = $conf;
 265                 $this->mUrlProtocols = wfUrlProtocols();
 266                 $this->mExtLinkBracketedRegex = '/\[(((?i)' . $this->mUrlProtocols . ')' .
 267                         self::EXT_LINK_ADDR .
 268                         self::EXT_LINK_URL_CLASS . '*)\p{Zs}*([^\]\\x00-\\x08\\x0a-\\x1F\\x{FFFD}]*?)\]/Su';
 269                 if ( isset( $conf['preprocessorClass'] ) ) {
 270                         $this->mPreprocessorClass = $conf['preprocessorClass'];
 271                 } elseif ( defined( 'HPHP_VERSION' ) ) {
 272                         # Preprocessor_Hash is much faster than Preprocessor_DOM under HipHop
 273                         $this->mPreprocessorClass = Preprocessor_Hash::class;
 274                 } elseif ( extension_loaded( 'domxml' ) ) {
 275                         # PECL extension that conflicts with the core DOM extension (T15770)
 276                         wfDebug( "Warning: you have the obsolete domxml extension for PHP. Please remove it!\n" );
 277                         $this->mPreprocessorClass = Preprocessor_Hash::class;
 278                 } elseif ( extension_loaded( 'dom' ) ) {
 279                         $this->mPreprocessorClass = Preprocessor_DOM::class;
 280                 } else {
 281                         $this->mPreprocessorClass = Preprocessor_Hash::class;
 282                 }
 283                 wfDebug( __CLASS__ . ": using preprocessor: {$this->mPreprocessorClass}\n" );
 284         }
 285
 286         /**
 287          * Reduce memory usage to reduce the impact of circular references
 288          */
 289         public function __destruct() {
 290                 if ( isset( $this->mLinkHolders ) ) {
 291                         unset( $this->mLinkHolders );
 292                 }
 293                 foreach ( $this as $name => $value ) {
 294                         unset( $this->$name );
 295                 }
 296         }
 297
 298         /**
 299          * Allow extensions to clean up when the parser is cloned
 300          */
 301         public function __clone() {
 302                 $this->mInParse = false;
 303
 304                 // T58226: When you create a reference "to" an object field, that
 305                 // makes the object field itself be a reference too (until the other
 306                 // reference goes out of scope). When cloning, any field that's a
 307                 // reference is copied as a reference in the new object. Both of these
 308                 // are defined PHP5 behaviors, as inconvenient as it is for us when old
 309                 // hooks from PHP4 days are passing fields by reference.
 310                 foreach ( [ 'mStripState', 'mVarCache' ] as $k ) {
 311                         // Make a non-reference copy of the field, then rebind the field to
 312                         // reference the new copy.
 313                         $tmp = $this->$k;
 314                         $this->$k =& $tmp;
 315                         unset( $tmp );
 316                 }
 317
 318                 Hooks::run( 'ParserCloned', [ $this ] );
 319         }
 320
 321         /**
 322          * Do various kinds of initialisation on the first call of the parser
 323          */
 324         public function firstCallInit() {
 325                 if ( !$this->mFirstCall ) {
 326                         return;
 327                 }
 328                 $this->mFirstCall = false;
 329
 330                 CoreParserFunctions::register( $this );
 331                 CoreTagHooks::register( $this );
 332                 $this->initialiseVariables();
 333
 334                 // Avoid PHP 7.1 warning from passing $this by reference
 335                 $parser = $this;
 336                 Hooks::run( 'ParserFirstCallInit', [ &$parser ] );
 337         }
 338
 339         /**
 340          * Clear Parser state
 341          *
 342          * @private
 343          */
 344         public function clearState() {
 345                 if ( $this->mFirstCall ) {
 346                         $this->firstCallInit();
 347                 }
 348                 $this->mOutput = new ParserOutput;
 349                 $this->mOptions->registerWatcher( [ $this->mOutput, 'recordOption' ] );
 350                 $this->mAutonumber = 0;
 351                 $this->mIncludeCount = [];
 352                 $this->mLinkHolders = new LinkHolderArray( $this );
 353                 $this->mLinkID = 0;
 354                 $this->mRevisionObject = $this->mRevisionTimestamp =
 355                         $this->mRevisionId = $this->mRevisionUser = $this->mRevisionSize = null;
 356                 $this->mVarCache = [];
 357                 $this->mUser = null;
 358                 $this->mLangLinkLanguages = [];
 359                 $this->currentRevisionCache = null;
 360
 361                 $this->mStripState = new StripState( $this );
 362
 363                 # Clear these on every parse, T6549
 364                 $this->mTplRedirCache = $this->mTplDomCache = [];
 365
 366                 $this->mShowToc = true;
 367                 $this->mForceTocPosition = false;
 368                 $this->mIncludeSizes = [
 369                         'post-expand' => 0,
 370                         'arg' => 0,
 371                 ];
 372                 $this->mPPNodeCount = 0;
 373                 $this->mGeneratedPPNodeCount = 0;
 374                 $this->mHighestExpansionDepth = 0;
 375                 $this->mDefaultSort = false;
 376                 $this->mHeadings = [];
 377                 $this->mDoubleUnderscores = [];
 378                 $this->mExpensiveFunctionCount = 0;
 379
 380                 # Fix cloning
 381                 if ( isset( $this->mPreprocessor ) && $this->mPreprocessor->parser !== $this ) {
 382                         $this->mPreprocessor = null;
 383                 }
 384
 385                 $this->mProfiler = new SectionProfiler();
 386
 387                 // Avoid PHP 7.1 warning from passing $this by reference
 388                 $parser = $this;
 389                 Hooks::run( 'ParserClearState', [ &$parser ] );
 390         }
 391
 392         /**
 393          * Convert wikitext to HTML
 394          * Do not call this function recursively.
 395          *
 396          * @param string $text Text we want to parse
 397          * @param Title $title
 398          * @param ParserOptions $options
 399          * @param bool $linestart
 400          * @param bool $clearState
 401          * @param int $revid Number to pass in {{REVISIONID}}
 402          * @return ParserOutput A ParserOutput
 403          */
 404         public function parse(
 405                 $text, Title $title, ParserOptions $options,
 406                 $linestart = true, $clearState = true, $revid = null
 407         ) {
 408                 if ( $clearState ) {
 409                         // We use U+007F DELETE to construct strip markers, so we have to make
 410                         // sure that this character does not occur in the input text.
 411                         $text = strtr( $text, "\x7f", "?" );
 412                         $magicScopeVariable = $this->lock();
 413                 }
 414                 // Strip U+0000 NULL (T159174)
 415                 $text = str_replace( "\000", '', $text );
 416
 417                 $this->startParse( $title, $options, self::OT_HTML, $clearState );
 418
 419                 $this->currentRevisionCache = null;
 420                 $this->mInputSize = strlen( $text );
 421                 if ( $this->mOptions->getEnableLimitReport() ) {
 422                         $this->mOutput->resetParseStartTime();
 423                 }
 424
 425                 $oldRevisionId = $this->mRevisionId;
 426                 $oldRevisionObject = $this->mRevisionObject;
 427                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 428                 $oldRevisionUser = $this->mRevisionUser;
 429                 $oldRevisionSize = $this->mRevisionSize;
 430                 if ( $revid !== null ) {
 431                         $this->mRevisionId = $revid;
 432                         $this->mRevisionObject = null;
 433                         $this->mRevisionTimestamp = null;
 434                         $this->mRevisionUser = null;
 435                         $this->mRevisionSize = null;
 436                 }
 437
 438                 // Avoid PHP 7.1 warning from passing $this by reference
 439                 $parser = $this;
 440                 Hooks::run( 'ParserBeforeStrip', [ &$parser, &$text, &$this->mStripState ] );
 441                 # No more strip!
 442                 Hooks::run( 'ParserAfterStrip', [ &$parser, &$text, &$this->mStripState ] );
 443                 $text = $this->internalParse( $text );
 444                 Hooks::run( 'ParserAfterParse', [ &$parser, &$text, &$this->mStripState ] );
 445
 446                 $text = $this->internalParseHalfParsed( $text, true, $linestart );
 447
 448                 /**
 449                  * A converted title will be provided in the output object if title and
 450                  * content conversion are enabled, the article text does not contain
 451                  * a conversion-suppressing double-underscore tag, and no
 452                  * {{DISPLAYTITLE:...}} is present. DISPLAYTITLE takes precedence over
 453                  * automatic link conversion.
 454                  */
 455                 if ( !( $options->getDisableTitleConversion()
 456                         || isset( $this->mDoubleUnderscores['nocontentconvert'] )
 457                         || isset( $this->mDoubleUnderscores['notitleconvert'] )
 458                         || $this->mOutput->getDisplayTitle() !== false )
 459                 ) {
 460                         $convruletitle = $this->getConverterLanguage()->getConvRuleTitle();
 461                         if ( $convruletitle ) {
 462                                 $this->mOutput->setTitleText( $convruletitle );
 463                         } else {
 464                                 $titleText = $this->getConverterLanguage()->convertTitle( $title );
 465                                 $this->mOutput->setTitleText( $titleText );
 466                         }
 467                 }
 468
 469                 # Compute runtime adaptive expiry if set
 470                 $this->mOutput->finalizeAdaptiveCacheExpiry();
 471
 472                 # Warn if too many heavyweight parser functions were used
 473                 if ( $this->mExpensiveFunctionCount > $this->mOptions->getExpensiveParserFunctionLimit() ) {
 474                         $this->limitationWarn( 'expensive-parserfunction',
 475                                 $this->mExpensiveFunctionCount,
 476                                 $this->mOptions->getExpensiveParserFunctionLimit()
 477                         );
 478                 }
 479
 480                 # Information on limits, for the benefit of users who try to skirt them
 481                 if ( $this->mOptions->getEnableLimitReport() ) {
 482                         $text .= $this->makeLimitReport();
 483                 }
 484
 485                 # Wrap non-interface parser output in a <div> so it can be targeted
 486                 # with CSS (T37247)
 487                 $class = $this->mOptions->getWrapOutputClass();
 488                 if ( $class !== false && !$this->mOptions->getInterfaceMessage() ) {
 489                         $text = Html::rawElement( 'div', [ 'class' => $class ], $text );
 490                 }
 491
 492                 $this->mOutput->setText( $text );
 493
 494                 $this->mRevisionId = $oldRevisionId;
 495                 $this->mRevisionObject = $oldRevisionObject;
 496                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 497                 $this->mRevisionUser = $oldRevisionUser;
 498                 $this->mRevisionSize = $oldRevisionSize;
 499                 $this->mInputSize = false;
 500                 $this->currentRevisionCache = null;
 501
 502                 return $this->mOutput;
 503         }
 504
 505         /**
 506          * Set the limit report data in the current ParserOutput, and return the
 507          * limit report HTML comment.
 508          *
 509          * @return string
 510          */
 511         protected function makeLimitReport() {
 512                 global $wgShowHostnames;
 513
 514                 $maxIncludeSize = $this->mOptions->getMaxIncludeSize();
 515
 516                 $cpuTime = $this->mOutput->getTimeSinceStart( 'cpu' );
 517                 if ( $cpuTime !== null ) {
 518                         $this->mOutput->setLimitReportData( 'limitreport-cputime',
 519                                 sprintf( "%.3f", $cpuTime )
 520                         );
 521                 }
 522
 523                 $wallTime = $this->mOutput->getTimeSinceStart( 'wall' );
 524                 $this->mOutput->setLimitReportData( 'limitreport-walltime',
 525                         sprintf( "%.3f", $wallTime )
 526                 );
 527
 528                 $this->mOutput->setLimitReportData( 'limitreport-ppvisitednodes',
 529                         [ $this->mPPNodeCount, $this->mOptions->getMaxPPNodeCount() ]
 530                 );
 531                 $this->mOutput->setLimitReportData( 'limitreport-ppgeneratednodes',
 532                         [ $this->mGeneratedPPNodeCount, $this->mOptions->getMaxGeneratedPPNodeCount() ]
 533                 );
 534                 $this->mOutput->setLimitReportData( 'limitreport-postexpandincludesize',
 535                         [ $this->mIncludeSizes['post-expand'], $maxIncludeSize ]
 536                 );
 537                 $this->mOutput->setLimitReportData( 'limitreport-templateargumentsize',
 538                         [ $this->mIncludeSizes['arg'], $maxIncludeSize ]
 539                 );
 540                 $this->mOutput->setLimitReportData( 'limitreport-expansiondepth',
 541                         [ $this->mHighestExpansionDepth, $this->mOptions->getMaxPPExpandDepth() ]
 542                 );
 543                 $this->mOutput->setLimitReportData( 'limitreport-expensivefunctioncount',
 544                         [ $this->mExpensiveFunctionCount, $this->mOptions->getExpensiveParserFunctionLimit() ]
 545                 );
 546
 547                 foreach ( $this->mStripState->getLimitReport() as list( $key, $value ) ) {
 548                         $this->mOutput->setLimitReportData( $key, $value );
 549                 }
 550
 551                 Hooks::run( 'ParserLimitReportPrepare', [ $this, $this->mOutput ] );
 552
 553                 $limitReport = "NewPP limit report\n";
 554                 if ( $wgShowHostnames ) {
 555                         $limitReport .= 'Parsed by ' . wfHostname() . "\n";
 556                 }
 557                 $limitReport .= 'Cached time: ' . $this->mOutput->getCacheTime() . "\n";
 558                 $limitReport .= 'Cache expiry: ' . $this->mOutput->getCacheExpiry() . "\n";
 559                 $limitReport .= 'Dynamic content: ' .
 560                         ( $this->mOutput->hasDynamicContent() ? 'true' : 'false' ) .
 561                         "\n";
 562
 563                 foreach ( $this->mOutput->getLimitReportData() as $key => $value ) {
 564                         if ( Hooks::run( 'ParserLimitReportFormat',
 565                                 [ $key, &$value, &$limitReport, false, false ]
 566                         ) ) {
 567                                 $keyMsg = wfMessage( $key )->inLanguage( 'en' )->useDatabase( false );
 568                                 $valueMsg = wfMessage( [ "$key-value-text", "$key-value" ] )
 569                                         ->inLanguage( 'en' )->useDatabase( false );
 570                                 if ( !$valueMsg->exists() ) {
 571                                         $valueMsg = new RawMessage( '$1' );
 572                                 }
 573                                 if ( !$keyMsg->isDisabled() && !$valueMsg->isDisabled() ) {
 574                                         $valueMsg->params( $value );
 575                                         $limitReport .= "{$keyMsg->text()}: {$valueMsg->text()}\n";
 576                                 }
 577                         }
 578                 }
 579                 // Since we're not really outputting HTML, decode the entities and
 580                 // then re-encode the things that need hiding inside HTML comments.
 581                 $limitReport = htmlspecialchars_decode( $limitReport );
 582                 // Run deprecated hook
 583                 Hooks::run( 'ParserLimitReport', [ $this, &$limitReport ], '1.22' );
 584
 585                 // Sanitize for comment. Note '‐' in the replacement is U+2010,
 586                 // which looks much like the problematic '-'.
 587                 $limitReport = str_replace( [ '-', '&' ], [ '‐', '&amp;' ], $limitReport );
 588                 $text = "\n<!-- \n$limitReport-->\n";
 589
 590                 // Add on template profiling data in human/machine readable way
 591                 $dataByFunc = $this->mProfiler->getFunctionStats();
 592                 uasort( $dataByFunc, function ( $a, $b ) {
 593                         return $a['real'] < $b['real']; // descending order
 594                 } );
 595                 $profileReport = [];
 596                 foreach ( array_slice( $dataByFunc, 0, 10 ) as $item ) {
 597                         $profileReport[] = sprintf( "%6.2f%% %8.3f %6d %s",
 598                                 $item['%real'], $item['real'], $item['calls'],
 599                                 htmlspecialchars( $item['name'] ) );
 600                 }
 601                 $text .= "<!--\nTransclusion expansion time report (%,ms,calls,template)\n";
 602                 $text .= implode( "\n", $profileReport ) . "\n-->\n";
 603
 604                 $this->mOutput->setLimitReportData( 'limitreport-timingprofile', $profileReport );
 605
 606                 // Add other cache related metadata
 607                 if ( $wgShowHostnames ) {
 608                         $this->mOutput->setLimitReportData( 'cachereport-origin', wfHostname() );
 609                 }
 610                 $this->mOutput->setLimitReportData( 'cachereport-timestamp',
 611                         $this->mOutput->getCacheTime() );
 612                 $this->mOutput->setLimitReportData( 'cachereport-ttl',
 613                         $this->mOutput->getCacheExpiry() );
 614                 $this->mOutput->setLimitReportData( 'cachereport-transientcontent',
 615                         $this->mOutput->hasDynamicContent() );
 616
 617                 if ( $this->mGeneratedPPNodeCount > $this->mOptions->getMaxGeneratedPPNodeCount() / 10 ) {
 618                         wfDebugLog( 'generated-pp-node-count', $this->mGeneratedPPNodeCount . ' ' .
 619                                 $this->mTitle->getPrefixedDBkey() );
 620                 }
 621                 return $text;
 622         }
 623
 624         /**
 625          * Half-parse wikitext to half-parsed HTML. This recursive parser entry point
 626          * can be called from an extension tag hook.
 627          *
 628          * The output of this function IS NOT SAFE PARSED HTML; it is "half-parsed"
 629          * instead, which means that lists and links have not been fully parsed yet,
 630          * and strip markers are still present.
 631          *
 632          * Use recursiveTagParseFully() to fully parse wikitext to output-safe HTML.
 633          *
 634          * Use this function if you're a parser tag hook and you want to parse
 635          * wikitext before or after applying additional transformations, and you
 636          * intend to *return the result as hook output*, which will cause it to go
 637          * through the rest of parsing process automatically.
 638          *
 639          * If $frame is not provided, then template variables (e.g., {{{1}}}) within
 640          * $text are not expanded
 641          *
 642          * @param string $text Text extension wants to have parsed
 643          * @param bool|PPFrame $frame The frame to use for expanding any template variables
 644          * @return string UNSAFE half-parsed HTML
 645          */
 646         public function recursiveTagParse( $text, $frame = false ) {
 647                 // Avoid PHP 7.1 warning from passing $this by reference
 648                 $parser = $this;
 649                 Hooks::run( 'ParserBeforeStrip', [ &$parser, &$text, &$this->mStripState ] );
 650                 Hooks::run( 'ParserAfterStrip', [ &$parser, &$text, &$this->mStripState ] );
 651                 $text = $this->internalParse( $text, false, $frame );
 652                 return $text;
 653         }
 654
 655         /**
 656          * Fully parse wikitext to fully parsed HTML. This recursive parser entry
 657          * point can be called from an extension tag hook.
 658          *
 659          * The output of this function is fully-parsed HTML that is safe for output.
 660          * If you're a parser tag hook, you might want to use recursiveTagParse()
 661          * instead.
 662          *
 663          * If $frame is not provided, then template variables (e.g., {{{1}}}) within
 664          * $text are not expanded
 665          *
 666          * @since 1.25
 667          *
 668          * @param string $text Text extension wants to have parsed
 669          * @param bool|PPFrame $frame The frame to use for expanding any template variables
 670          * @return string Fully parsed HTML
 671          */
 672         public function recursiveTagParseFully( $text, $frame = false ) {
 673                 $text = $this->recursiveTagParse( $text, $frame );
 674                 $text = $this->internalParseHalfParsed( $text, false );
 675                 return $text;
 676         }
 677
 678         /**
 679          * Expand templates and variables in the text, producing valid, static wikitext.
 680          * Also removes comments.
 681          * Do not call this function recursively.
 682          * @param string $text
 683          * @param Title $title
 684          * @param ParserOptions $options
 685          * @param int|null $revid
 686          * @param bool|PPFrame $frame
 687          * @return mixed|string
 688          */
 689         public function preprocess( $text, Title $title = null,
 690                 ParserOptions $options, $revid = null, $frame = false
 691         ) {
 692                 $magicScopeVariable = $this->lock();
 693                 $this->startParse( $title, $options, self::OT_PREPROCESS, true );
 694                 if ( $revid !== null ) {
 695                         $this->mRevisionId = $revid;
 696                 }
 697                 // Avoid PHP 7.1 warning from passing $this by reference
 698                 $parser = $this;
 699                 Hooks::run( 'ParserBeforeStrip', [ &$parser, &$text, &$this->mStripState ] );
 700                 Hooks::run( 'ParserAfterStrip', [ &$parser, &$text, &$this->mStripState ] );
 701                 $text = $this->replaceVariables( $text, $frame );
 702                 $text = $this->mStripState->unstripBoth( $text );
 703                 return $text;
 704         }
 705
 706         /**
 707          * Recursive parser entry point that can be called from an extension tag
 708          * hook.
 709          *
 710          * @param string $text Text to be expanded
 711          * @param bool|PPFrame $frame The frame to use for expanding any template variables
 712          * @return string
 713          * @since 1.19
 714          */
 715         public function recursivePreprocess( $text, $frame = false ) {
 716                 $text = $this->replaceVariables( $text, $frame );
 717                 $text = $this->mStripState->unstripBoth( $text );
 718                 return $text;
 719         }
 720
 721         /**
 722          * Process the wikitext for the "?preload=" feature. (T7210)
 723          *
 724          * "<noinclude>", "<includeonly>" etc. are parsed as for template
 725          * transclusion, comments, templates, arguments, tags hooks and parser
 726          * functions are untouched.
 727          *
 728          * @param string $text
 729          * @param Title $title
 730          * @param ParserOptions $options
 731          * @param array $params
 732          * @return string
 733          */
 734         public function getPreloadText( $text, Title $title, ParserOptions $options, $params = [] ) {
 735                 $msg = new RawMessage( $text );
 736                 $text = $msg->params( $params )->plain();
 737
 738                 # Parser (re)initialisation
 739                 $magicScopeVariable = $this->lock();
 740                 $this->startParse( $title, $options, self::OT_PLAIN, true );
 741
 742                 $flags = PPFrame::NO_ARGS | PPFrame::NO_TEMPLATES;
 743                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
 744                 $text = $this->getPreprocessor()->newFrame()->expand( $dom, $flags );
 745                 $text = $this->mStripState->unstripBoth( $text );
 746                 return $text;
 747         }
 748
 749         /**
 750          * Set the current user.
 751          * Should only be used when doing pre-save transform.
 752          *
 753          * @param User|null $user User object or null (to reset)
 754          */
 755         public function setUser( $user ) {
 756                 $this->mUser = $user;
 757         }
 758
 759         /**
 760          * Set the context title
 761          *
 762          * @param Title $t
 763          */
 764         public function setTitle( $t ) {
 765                 if ( !$t ) {
 766                         $t = Title::newFromText( 'NO TITLE' );
 767                 }
 768
 769                 if ( $t->hasFragment() ) {
 770                         # Strip the fragment to avoid various odd effects
 771                         $this->mTitle = $t->createFragmentTarget( '' );
 772                 } else {
 773                         $this->mTitle = $t;
 774                 }
 775         }
 776
 777         /**
 778          * Accessor for the Title object
 779          *
 780          * @return Title
 781          */
 782         public function getTitle() {
 783                 return $this->mTitle;
 784         }
 785
 786         /**
 787          * Accessor/mutator for the Title object
 788          *
 789          * @param Title $x Title object or null to just get the current one
 790          * @return Title
 791          */
 792         public function Title( $x = null ) {
 793                 return wfSetVar( $this->mTitle, $x );
 794         }
 795
 796         /**
 797          * Set the output type
 798          *
 799          * @param int $ot New value
 800          */
 801         public function setOutputType( $ot ) {
 802                 $this->mOutputType = $ot;
 803                 # Shortcut alias
 804                 $this->ot = [
 805                         'html' => $ot == self::OT_HTML,
 806                         'wiki' => $ot == self::OT_WIKI,
 807                         'pre' => $ot == self::OT_PREPROCESS,
 808                         'plain' => $ot == self::OT_PLAIN,
 809                 ];
 810         }
 811
 812         /**
 813          * Accessor/mutator for the output type
 814          *
 815          * @param int|null $x New value or null to just get the current one
 816          * @return int
 817          */
 818         public function OutputType( $x = null ) {
 819                 return wfSetVar( $this->mOutputType, $x );
 820         }
 821
 822         /**
 823          * Get the ParserOutput object
 824          *
 825          * @return ParserOutput
 826          */
 827         public function getOutput() {
 828                 return $this->mOutput;
 829         }
 830
 831         /**
 832          * Get the ParserOptions object
 833          *
 834          * @return ParserOptions
 835          */
 836         public function getOptions() {
 837                 return $this->mOptions;
 838         }
 839
 840         /**
 841          * Accessor/mutator for the ParserOptions object
 842          *
 843          * @param ParserOptions $x New value or null to just get the current one
 844          * @return ParserOptions Current ParserOptions object
 845          */
 846         public function Options( $x = null ) {
 847                 return wfSetVar( $this->mOptions, $x );
 848         }
 849
 850         /**
 851          * @return int
 852          */
 853         public function nextLinkID() {
 854                 return $this->mLinkID++;
 855         }
 856
 857         /**
 858          * @param int $id
 859          */
 860         public function setLinkID( $id ) {
 861                 $this->mLinkID = $id;
 862         }
 863
 864         /**
 865          * Get a language object for use in parser functions such as {{FORMATNUM:}}
 866          * @return Language
 867          */
 868         public function getFunctionLang() {
 869                 return $this->getTargetLanguage();
 870         }
 871
 872         /**
 873          * Get the target language for the content being parsed. This is usually the
 874          * language that the content is in.
 875          *
 876          * @since 1.19
 877          *
 878          * @throws MWException
 879          * @return Language
 880          */
 881         public function getTargetLanguage() {
 882                 $target = $this->mOptions->getTargetLanguage();
 883
 884                 if ( $target !== null ) {
 885                         return $target;
 886                 } elseif ( $this->mOptions->getInterfaceMessage() ) {
 887                         return $this->mOptions->getUserLangObj();
 888                 } elseif ( is_null( $this->mTitle ) ) {
 889                         throw new MWException( __METHOD__ . ': $this->mTitle is null' );
 890                 }
 891
 892                 return $this->mTitle->getPageLanguage();
 893         }
 894
 895         /**
 896          * Get the language object for language conversion
 897          * @return Language|null
 898          */
 899         public function getConverterLanguage() {
 900                 return $this->getTargetLanguage();
 901         }
 902
 903         /**
 904          * Get a User object either from $this->mUser, if set, or from the
 905          * ParserOptions object otherwise
 906          *
 907          * @return User
 908          */
 909         public function getUser() {
 910                 if ( !is_null( $this->mUser ) ) {
 911                         return $this->mUser;
 912                 }
 913                 return $this->mOptions->getUser();
 914         }
 915
 916         /**
 917          * Get a preprocessor object
 918          *
 919          * @return Preprocessor
 920          */
 921         public function getPreprocessor() {
 922                 if ( !isset( $this->mPreprocessor ) ) {
 923                         $class = $this->mPreprocessorClass;
 924                         $this->mPreprocessor = new $class( $this );
 925                 }
 926                 return $this->mPreprocessor;
 927         }
 928
 929         /**
 930          * Get a LinkRenderer instance to make links with
 931          *
 932          * @since 1.28
 933          * @return LinkRenderer
 934          */
 935         public function getLinkRenderer() {
 936                 if ( !$this->mLinkRenderer ) {
 937                         $this->mLinkRenderer = MediaWikiServices::getInstance()
 938                                 ->getLinkRendererFactory()->create();
 939                         $this->mLinkRenderer->setStubThreshold(
 940                                 $this->getOptions()->getStubThreshold()
 941                         );
 942                 }
 943
 944                 return $this->mLinkRenderer;
 945         }
 946
 947         /**
 948          * Replaces all occurrences of HTML-style comments and the given tags
 949          * in the text with a random marker and returns the next text. The output
 950          * parameter $matches will be an associative array filled with data in
 951          * the form:
 952          *
 953          * @code
 954          *   'UNIQ-xxxxx' => [
 955          *     'element',
 956          *     'tag content',
 957          *     [ 'param' => 'x' ],
 958          *     '<element param="x">tag content</element>' ]
 959          * @endcode
 960          *
 961          * @param array $elements List of element names. Comments are always extracted.
 962          * @param string $text Source text string.
 963          * @param array &$matches Out parameter, Array: extracted tags
 964          * @return string Stripped text
 965          */
 966         public static function extractTagsAndParams( $elements, $text, &$matches ) {
 967                 static $n = 1;
 968                 $stripped = '';
 969                 $matches = [];
 970
 971                 $taglist = implode( '|', $elements );
 972                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?" . ">)|<(!--)/i";
 973
 974                 while ( $text != '' ) {
 975                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 976                         $stripped .= $p[0];
 977                         if ( count( $p ) < 5 ) {
 978                                 break;
 979                         }
 980                         if ( count( $p ) > 5 ) {
 981                                 # comment
 982                                 $element = $p[4];
 983                                 $attributes = '';
 984                                 $close = '';
 985                                 $inside = $p[5];
 986                         } else {
 987                                 # tag
 988                                 $element = $p[1];
 989                                 $attributes = $p[2];
 990                                 $close = $p[3];
 991                                 $inside = $p[4];
 992                         }
 993
 994                         $marker = self::MARKER_PREFIX . "-$element-" . sprintf( '%08X', $n++ ) . self::MARKER_SUFFIX;
 995                         $stripped .= $marker;
 996
 997                         if ( $close === '/>' ) {
 998                                 # Empty element tag, <tag />
 999                                 $content = null;
1000                                 $text = $inside;
1001                                 $tail = null;
1002                         } else {
1003                                 if ( $element === '!--' ) {
1004                                         $end = '/(-->)/';
1005                                 } else {
1006                                         $end = "/(<\\/$element\\s*>)/i";
1007                                 }
1008                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
1009                                 $content = $q[0];
1010                                 if ( count( $q ) < 3 ) {
1011                                         # No end tag -- let it run out to the end of the text.
1012                                         $tail = '';
1013                                         $text = '';
1014                                 } else {
1015                                         $tail = $q[1];
1016                                         $text = $q[2];
1017                                 }
1018                         }
1019
1020                         $matches[$marker] = [ $element,
1021                                 $content,
1022                                 Sanitizer::decodeTagAttributes( $attributes ),
1023                                 "<$element$attributes$close$content$tail" ];
1024                 }
1025                 return $stripped;
1026         }
1027
1028         /**
1029          * Get a list of strippable XML-like elements
1030          *
1031          * @return array
1032          */
1033         public function getStripList() {
1034                 return $this->mStripList;
1035         }
1036
1037         /**
1038          * Add an item to the strip state
1039          * Returns the unique tag which must be inserted into the stripped text
1040          * The tag will be replaced with the original text in unstrip()
1041          *
1042          * @param string $text
1043          *
1044          * @return string
1045          */
1046         public function insertStripItem( $text ) {
1047                 $marker = self::MARKER_PREFIX . "-item-{$this->mMarkerIndex}-" . self::MARKER_SUFFIX;
1048                 $this->mMarkerIndex++;
1049                 $this->mStripState->addGeneral( $marker, $text );
1050                 return $marker;
1051         }
1052
1053         /**
1054          * parse the wiki syntax used to render tables
1055          *
1056          * @private
1057          * @param string $text
1058          * @return string
1059          */
1060         public function doTableStuff( $text ) {
1061                 $lines = StringUtils::explode( "\n", $text );
1062                 $out = '';
1063                 $td_history = []; # Is currently a td tag open?
1064                 $last_tag_history = []; # Save history of last lag activated (td, th or caption)
1065                 $tr_history = []; # Is currently a tr tag open?
1066                 $tr_attributes = []; # history of tr attributes
1067                 $has_opened_tr = []; # Did this table open a <tr> element?
1068                 $indent_level = 0; # indent level of the table
1069
1070                 foreach ( $lines as $outLine ) {
1071                         $line = trim( $outLine );
1072
1073                         if ( $line === '' ) { # empty line, go to next line
1074                                 $out .= $outLine . "\n";
1075                                 continue;
1076                         }
1077
1078                         $first_character = $line[0];
1079                         $first_two = substr( $line, 0, 2 );
1080                         $matches = [];
1081
1082                         if ( preg_match( '/^(:*)\s*\{\|(.*)$/', $line, $matches ) ) {
1083                                 # First check if we are starting a new table
1084                                 $indent_level = strlen( $matches[1] );
1085
1086                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
1087                                 $attributes = Sanitizer::fixTagAttributes( $attributes, 'table' );
1088
1089                                 $outLine = str_repeat( '<dl><dd>', $indent_level ) . "<table{$attributes}>";
1090                                 array_push( $td_history, false );
1091                                 array_push( $last_tag_history, '' );
1092                                 array_push( $tr_history, false );
1093                                 array_push( $tr_attributes, '' );
1094                                 array_push( $has_opened_tr, false );
1095                         } elseif ( count( $td_history ) == 0 ) {
1096                                 # Don't do any of the following
1097                                 $out .= $outLine . "\n";
1098                                 continue;
1099                         } elseif ( $first_two === '|}' ) {
1100                                 # We are ending a table
1101                                 $line = '</table>' . substr( $line, 2 );
1102                                 $last_tag = array_pop( $last_tag_history );
1103
1104                                 if ( !array_pop( $has_opened_tr ) ) {
1105                                         $line = "<tr><td></td></tr>{$line}";
1106                                 }
1107
1108                                 if ( array_pop( $tr_history ) ) {
1109                                         $line = "</tr>{$line}";
1110                                 }
1111
1112                                 if ( array_pop( $td_history ) ) {
1113                                         $line = "</{$last_tag}>{$line}";
1114                                 }
1115                                 array_pop( $tr_attributes );
1116                                 if ( $indent_level > 0 ) {
1117                                         $outLine = rtrim( $line ) . str_repeat( '</dd></dl>', $indent_level );
1118                                 } else {
1119                                         $outLine = $line;
1120                                 }
1121                         } elseif ( $first_two === '|-' ) {
1122                                 # Now we have a table row
1123                                 $line = preg_replace( '#^\|-+#', '', $line );
1124
1125                                 # Whats after the tag is now only attributes
1126                                 $attributes = $this->mStripState->unstripBoth( $line );
1127                                 $attributes = Sanitizer::fixTagAttributes( $attributes, 'tr' );
1128                                 array_pop( $tr_attributes );
1129                                 array_push( $tr_attributes, $attributes );
1130
1131                                 $line = '';
1132                                 $last_tag = array_pop( $last_tag_history );
1133                                 array_pop( $has_opened_tr );
1134                                 array_push( $has_opened_tr, true );
1135
1136                                 if ( array_pop( $tr_history ) ) {
1137                                         $line = '</tr>';
1138                                 }
1139
1140                                 if ( array_pop( $td_history ) ) {
1141                                         $line = "</{$last_tag}>{$line}";
1142                                 }
1143
1144                                 $outLine = $line;
1145                                 array_push( $tr_history, false );
1146                                 array_push( $td_history, false );
1147                                 array_push( $last_tag_history, '' );
1148                         } elseif ( $first_character === '|'
1149                                 || $first_character === '!'
1150                                 || $first_two === '|+'
1151                         ) {
1152                                 # This might be cell elements, td, th or captions
1153                                 if ( $first_two === '|+' ) {
1154                                         $first_character = '+';
1155                                         $line = substr( $line, 2 );
1156                                 } else {
1157                                         $line = substr( $line, 1 );
1158                                 }
1159
1160                                 // Implies both are valid for table headings.
1161                                 if ( $first_character === '!' ) {
1162                                         $line = StringUtils::replaceMarkup( '!!', '||', $line );
1163                                 }
1164
1165                                 # Split up multiple cells on the same line.
1166                                 # FIXME : This can result in improper nesting of tags processed
1167                                 # by earlier parser steps.
1168                                 $cells = explode( '||', $line );
1169
1170                                 $outLine = '';
1171
1172                                 # Loop through each table cell
1173                                 foreach ( $cells as $cell ) {
1174                                         $previous = '';
1175                                         if ( $first_character !== '+' ) {
1176                                                 $tr_after = array_pop( $tr_attributes );
1177                                                 if ( !array_pop( $tr_history ) ) {
1178                                                         $previous = "<tr{$tr_after}>\n";
1179                                                 }
1180                                                 array_push( $tr_history, true );
1181                                                 array_push( $tr_attributes, '' );
1182                                                 array_pop( $has_opened_tr );
1183                                                 array_push( $has_opened_tr, true );
1184                                         }
1185
1186                                         $last_tag = array_pop( $last_tag_history );
1187
1188                                         if ( array_pop( $td_history ) ) {
1189                                                 $previous = "</{$last_tag}>\n{$previous}";
1190                                         }
1191
1192                                         if ( $first_character === '|' ) {
1193                                                 $last_tag = 'td';
1194                                         } elseif ( $first_character === '!' ) {
1195                                                 $last_tag = 'th';
1196                                         } elseif ( $first_character === '+' ) {
1197                                                 $last_tag = 'caption';
1198                                         } else {
1199                                                 $last_tag = '';
1200                                         }
1201
1202                                         array_push( $last_tag_history, $last_tag );
1203
1204                                         # A cell could contain both parameters and data
1205                                         $cell_data = explode( '|', $cell, 2 );
1206
1207                                         # T2553: Note that a '|' inside an invalid link should not
1208                                         # be mistaken as delimiting cell parameters
1209                                         # Bug T153140: Neither should language converter markup.
1210                                         if ( preg_match( '/\[\[|-\{/', $cell_data[0] ) === 1 ) {
1211                                                 $cell = "{$previous}<{$last_tag}>" . trim( $cell );
1212                                         } elseif ( count( $cell_data ) == 1 ) {
1213                                                 // Whitespace in cells is trimmed
1214                                                 $cell = "{$previous}<{$last_tag}>" . trim( $cell_data[0] );
1215                                         } else {
1216                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
1217                                                 $attributes = Sanitizer::fixTagAttributes( $attributes, $last_tag );
1218                                                 // Whitespace in cells is trimmed
1219                                                 $cell = "{$previous}<{$last_tag}{$attributes}>" . trim( $cell_data[1] );
1220                                         }
1221
1222                                         $outLine .= $cell;
1223                                         array_push( $td_history, true );
1224                                 }
1225                         }
1226                         $out .= $outLine . "\n";
1227                 }
1228
1229                 # Closing open td, tr && table
1230                 while ( count( $td_history ) > 0 ) {
1231                         if ( array_pop( $td_history ) ) {
1232                                 $out .= "</td>\n";
1233                         }
1234                         if ( array_pop( $tr_history ) ) {
1235                                 $out .= "</tr>\n";
1236                         }
1237                         if ( !array_pop( $has_opened_tr ) ) {
1238                                 $out .= "<tr><td></td></tr>\n";
1239                         }
1240
1241                         $out .= "</table>\n";
1242                 }
1243
1244                 # Remove trailing line-ending (b/c)
1245                 if ( substr( $out, -1 ) === "\n" ) {
1246                         $out = substr( $out, 0, -1 );
1247                 }
1248
1249                 # special case: don't return empty table
1250                 if ( $out === "<table>\n<tr><td></td></tr>\n</table>" ) {
1251                         $out = '';
1252                 }
1253
1254                 return $out;
1255         }
1256
1257         /**
1258          * Helper function for parse() that transforms wiki markup into half-parsed
1259          * HTML. Only called for $mOutputType == self::OT_HTML.
1260          *
1261          * @private
1262          *
1263          * @param string $text The text to parse
1264          * @param bool $isMain Whether this is being called from the main parse() function
1265          * @param PPFrame|bool $frame A pre-processor frame
1266          *
1267          * @return string
1268          */
1269         public function internalParse( $text, $isMain = true, $frame = false ) {
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 = self::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                 $text = preg_replace_callback(
1453                         '!(?:                        # Start cases
1454                                 (<a[ \t\r\n>].*?</a>) |    # m[1]: Skip link text
1455                                 (<.*?>) |                  # m[2]: Skip stuff inside HTML elements' . "
1456                                 (\b                        # m[3]: Free external links
1457                                         (?i:$prots)
1458                                         ($addr$urlChar*)         # m[4]: Post-protocol path
1459                                 ) |
1460                                 \b(?:RFC|PMID) $spaces     # m[5]: RFC or PMID, capture number
1461                                         ([0-9]+)\b |
1462                                 \bISBN $spaces (           # m[6]: ISBN, capture number
1463                                         (?: 97[89] $spdash? )?   #  optional 13-digit ISBN prefix
1464                                         (?: [0-9]  $spdash? ){9} #  9 digits with opt. delimiters
1465                                         [0-9Xx]                  #  check digit
1466                                 )\b
1467                         )!xu", [ $this, 'magicLinkCallback' ], $text );
1468                 return $text;
1469         }
1470
1471         /**
1472          * @throws MWException
1473          * @param array $m
1474          * @return string HTML
1475          */
1476         public function magicLinkCallback( $m ) {
1477                 if ( isset( $m[1] ) && $m[1] !== '' ) {
1478                         # Skip anchor
1479                         return $m[0];
1480                 } elseif ( isset( $m[2] ) && $m[2] !== '' ) {
1481                         # Skip HTML element
1482                         return $m[0];
1483                 } elseif ( isset( $m[3] ) && $m[3] !== '' ) {
1484                         # Free external link
1485                         return $this->makeFreeExternalLink( $m[0], strlen( $m[4] ) );
1486                 } elseif ( isset( $m[5] ) && $m[5] !== '' ) {
1487                         # RFC or PMID
1488                         if ( substr( $m[0], 0, 3 ) === 'RFC' ) {
1489                                 if ( !$this->mOptions->getMagicRFCLinks() ) {
1490                                         return $m[0];
1491                                 }
1492                                 $keyword = 'RFC';
1493                                 $urlmsg = 'rfcurl';
1494                                 $cssClass = 'mw-magiclink-rfc';
1495                                 $trackingCat = 'magiclink-tracking-rfc';
1496                                 $id = $m[5];
1497                         } elseif ( substr( $m[0], 0, 4 ) === 'PMID' ) {
1498                                 if ( !$this->mOptions->getMagicPMIDLinks() ) {
1499                                         return $m[0];
1500                                 }
1501                                 $keyword = 'PMID';
1502                                 $urlmsg = 'pubmedurl';
1503                                 $cssClass = 'mw-magiclink-pmid';
1504                                 $trackingCat = 'magiclink-tracking-pmid';
1505                                 $id = $m[5];
1506                         } else {
1507                                 throw new MWException( __METHOD__ . ': unrecognised match type "' .
1508                                         substr( $m[0], 0, 20 ) . '"' );
1509                         }
1510                         $url = wfMessage( $urlmsg, $id )->inContentLanguage()->text();
1511                         $this->addTrackingCategory( $trackingCat );
1512                         return Linker::makeExternalLink( $url, "{$keyword} {$id}", true, $cssClass, [], $this->mTitle );
1513                 } elseif ( isset( $m[6] ) && $m[6] !== ''
1514                         && $this->mOptions->getMagicISBNLinks()
1515                 ) {
1516                         # ISBN
1517                         $isbn = $m[6];
1518                         $space = self::SPACE_NOT_NL; #  non-newline space
1519                         $isbn = preg_replace( "/$space/", ' ', $isbn );
1520                         $num = strtr( $isbn, [
1521                                 '-' => '',
1522                                 ' ' => '',
1523                                 'x' => 'X',
1524                         ] );
1525                         $this->addTrackingCategory( 'magiclink-tracking-isbn' );
1526                         return $this->getLinkRenderer()->makeKnownLink(
1527                                 SpecialPage::getTitleFor( 'Booksources', $num ),
1528                                 "ISBN $isbn",
1529                                 [
1530                                         'class' => 'internal mw-magiclink-isbn',
1531                                         'title' => false // suppress title attribute
1532                                 ]
1533                         );
1534                 } else {
1535                         return $m[0];
1536                 }
1537         }
1538
1539         /**
1540          * Make a free external link, given a user-supplied URL
1541          *
1542          * @param string $url
1543          * @param int $numPostProto
1544          *   The number of characters after the protocol.
1545          * @return string HTML
1546          * @private
1547          */
1548         public function makeFreeExternalLink( $url, $numPostProto ) {
1549                 $trail = '';
1550
1551                 # The characters '<' and '>' (which were escaped by
1552                 # removeHTMLtags()) should not be included in
1553                 # URLs, per RFC 2396.
1554                 # Make &nbsp; terminate a URL as well (bug T84937)
1555                 $m2 = [];
1556                 if ( preg_match(
1557                         '/&(lt|gt|nbsp|#x0*(3[CcEe]|[Aa]0)|#0*(60|62|160));/',
1558                         $url,
1559                         $m2,
1560                         PREG_OFFSET_CAPTURE
1561                 ) ) {
1562                         $trail = substr( $url, $m2[0][1] ) . $trail;
1563                         $url = substr( $url, 0, $m2[0][1] );
1564                 }
1565
1566                 # Move trailing punctuation to $trail
1567                 $sep = ',;\.:!?';
1568                 # If there is no left bracket, then consider right brackets fair game too
1569                 if ( strpos( $url, '(' ) === false ) {
1570                         $sep .= ')';
1571                 }
1572
1573                 $urlRev = strrev( $url );
1574                 $numSepChars = strspn( $urlRev, $sep );
1575                 # Don't break a trailing HTML entity by moving the ; into $trail
1576                 # This is in hot code, so use substr_compare to avoid having to
1577                 # create a new string object for the comparison
1578                 if ( $numSepChars && substr_compare( $url, ";", -$numSepChars, 1 ) === 0 ) {
1579                         # more optimization: instead of running preg_match with a $
1580                         # anchor, which can be slow, do the match on the reversed
1581                         # string starting at the desired offset.
1582                         # un-reversed regexp is: /&([a-z]+|#x[\da-f]+|#\d+)$/i
1583                         if ( preg_match( '/\G([a-z]+|[\da-f]+x#|\d+#)&/i', $urlRev, $m2, 0, $numSepChars ) ) {
1584                                 $numSepChars--;
1585                         }
1586                 }
1587                 if ( $numSepChars ) {
1588                         $trail = substr( $url, -$numSepChars ) . $trail;
1589                         $url = substr( $url, 0, -$numSepChars );
1590                 }
1591
1592                 # Verify that we still have a real URL after trail removal, and
1593                 # not just lone protocol
1594                 if ( strlen( $trail ) >= $numPostProto ) {
1595                         return $url . $trail;
1596                 }
1597
1598                 $url = Sanitizer::cleanUrl( $url );
1599
1600                 # Is this an external image?
1601                 $text = $this->maybeMakeExternalImage( $url );
1602                 if ( $text === false ) {
1603                         # Not an image, make a link
1604                         $text = Linker::makeExternalLink( $url,
1605                                 $this->getConverterLanguage()->markNoConversion( $url, true ),
1606                                 true, 'free',
1607                                 $this->getExternalLinkAttribs( $url ), $this->mTitle );
1608                         # Register it in the output object...
1609                         $this->mOutput->addExternalLink( $url );
1610                 }
1611                 return $text . $trail;
1612         }
1613
1614         /**
1615          * Parse headers and return html
1616          *
1617          * @private
1618          *
1619          * @param string $text
1620          *
1621          * @return string
1622          */
1623         public function doHeadings( $text ) {
1624                 for ( $i = 6; $i >= 1; --$i ) {
1625                         $h = str_repeat( '=', $i );
1626                         // Trim non-newline whitespace from headings
1627                         // Using \s* will break for: "==\n===\n" and parse as <h2>=</h2>
1628                         $text = preg_replace( "/^(?:$h)[ \\t]*(.+?)[ \\t]*(?:$h)\\s*$/m", "<h$i>\\1</h$i>", $text );
1629                 }
1630                 return $text;
1631         }
1632
1633         /**
1634          * Replace single quotes with HTML markup
1635          * @private
1636          *
1637          * @param string $text
1638          *
1639          * @return string The altered text
1640          */
1641         public function doAllQuotes( $text ) {
1642                 $outtext = '';
1643                 $lines = StringUtils::explode( "\n", $text );
1644                 foreach ( $lines as $line ) {
1645                         $outtext .= $this->doQuotes( $line ) . "\n";
1646                 }
1647                 $outtext = substr( $outtext, 0, -1 );
1648                 return $outtext;
1649         }
1650
1651         /**
1652          * Helper function for doAllQuotes()
1653          *
1654          * @param string $text
1655          *
1656          * @return string
1657          */
1658         public function doQuotes( $text ) {
1659                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1660                 $countarr = count( $arr );
1661                 if ( $countarr == 1 ) {
1662                         return $text;
1663                 }
1664
1665                 // First, do some preliminary work. This may shift some apostrophes from
1666                 // being mark-up to being text. It also counts the number of occurrences
1667                 // of bold and italics mark-ups.
1668                 $numbold = 0;
1669                 $numitalics = 0;
1670                 for ( $i = 1; $i < $countarr; $i += 2 ) {
1671                         $thislen = strlen( $arr[$i] );
1672                         // If there are ever four apostrophes, assume the first is supposed to
1673                         // be text, and the remaining three constitute mark-up for bold text.
1674                         // (T15227: ''''foo'''' turns into ' ''' foo ' ''')
1675                         if ( $thislen == 4 ) {
1676                                 $arr[$i - 1] .= "'";
1677                                 $arr[$i] = "'''";
1678                                 $thislen = 3;
1679                         } elseif ( $thislen > 5 ) {
1680                                 // If there are more than 5 apostrophes in a row, assume they're all
1681                                 // text except for the last 5.
1682                                 // (T15227: ''''''foo'''''' turns into ' ''''' foo ' ''''')
1683                                 $arr[$i - 1] .= str_repeat( "'", $thislen - 5 );
1684                                 $arr[$i] = "'''''";
1685                                 $thislen = 5;
1686                         }
1687                         // Count the number of occurrences of bold and italics mark-ups.
1688                         if ( $thislen == 2 ) {
1689                                 $numitalics++;
1690                         } elseif ( $thislen == 3 ) {
1691                                 $numbold++;
1692                         } elseif ( $thislen == 5 ) {
1693                                 $numitalics++;
1694                                 $numbold++;
1695                         }
1696                 }
1697
1698                 // If there is an odd number of both bold and italics, it is likely
1699                 // that one of the bold ones was meant to be an apostrophe followed
1700                 // by italics. Which one we cannot know for certain, but it is more
1701                 // likely to be one that has a single-letter word before it.
1702                 if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) ) {
1703                         $firstsingleletterword = -1;
1704                         $firstmultiletterword = -1;
1705                         $firstspace = -1;
1706                         for ( $i = 1; $i < $countarr; $i += 2 ) {
1707                                 if ( strlen( $arr[$i] ) == 3 ) {
1708                                         $x1 = substr( $arr[$i - 1], -1 );
1709                                         $x2 = substr( $arr[$i - 1], -2, 1 );
1710                                         if ( $x1 === ' ' ) {
1711                                                 if ( $firstspace == -1 ) {
1712                                                         $firstspace = $i;
1713                                                 }
1714                                         } elseif ( $x2 === ' ' ) {
1715                                                 $firstsingleletterword = $i;
1716                                                 // if $firstsingleletterword is set, we don't
1717                                                 // look at the other options, so we can bail early.
1718                                                 break;
1719                                         } else {
1720                                                 if ( $firstmultiletterword == -1 ) {
1721                                                         $firstmultiletterword = $i;
1722                                                 }
1723                                         }
1724                                 }
1725                         }
1726
1727                         // If there is a single-letter word, use it!
1728                         if ( $firstsingleletterword > -1 ) {
1729                                 $arr[$firstsingleletterword] = "''";
1730                                 $arr[$firstsingleletterword - 1] .= "'";
1731                         } elseif ( $firstmultiletterword > -1 ) {
1732                                 // If not, but there's a multi-letter word, use that one.
1733                                 $arr[$firstmultiletterword] = "''";
1734                                 $arr[$firstmultiletterword - 1] .= "'";
1735                         } elseif ( $firstspace > -1 ) {
1736                                 // ... otherwise use the first one that has neither.
1737                                 // (notice that it is possible for all three to be -1 if, for example,
1738                                 // there is only one pentuple-apostrophe in the line)
1739                                 $arr[$firstspace] = "''";
1740                                 $arr[$firstspace - 1] .= "'";
1741                         }
1742                 }
1743
1744                 // Now let's actually convert our apostrophic mush to HTML!
1745                 $output = '';
1746                 $buffer = '';
1747                 $state = '';
1748                 $i = 0;
1749                 foreach ( $arr as $r ) {
1750                         if ( ( $i % 2 ) == 0 ) {
1751                                 if ( $state === 'both' ) {
1752                                         $buffer .= $r;
1753                                 } else {
1754                                         $output .= $r;
1755                                 }
1756                         } else {
1757                                 $thislen = strlen( $r );
1758                                 if ( $thislen == 2 ) {
1759                                         if ( $state === 'i' ) {
1760                                                 $output .= '</i>';
1761                                                 $state = '';
1762                                         } elseif ( $state === 'bi' ) {
1763                                                 $output .= '</i>';
1764                                                 $state = 'b';
1765                                         } elseif ( $state === 'ib' ) {
1766                                                 $output .= '</b></i><b>';
1767                                                 $state = 'b';
1768                                         } elseif ( $state === 'both' ) {
1769                                                 $output .= '<b><i>' . $buffer . '</i>';
1770                                                 $state = 'b';
1771                                         } else { // $state can be 'b' or ''
1772                                                 $output .= '<i>';
1773                                                 $state .= 'i';
1774                                         }
1775                                 } elseif ( $thislen == 3 ) {
1776                                         if ( $state === 'b' ) {
1777                                                 $output .= '</b>';
1778                                                 $state = '';
1779                                         } elseif ( $state === 'bi' ) {
1780                                                 $output .= '</i></b><i>';
1781                                                 $state = 'i';
1782                                         } elseif ( $state === 'ib' ) {
1783                                                 $output .= '</b>';
1784                                                 $state = 'i';
1785                                         } elseif ( $state === 'both' ) {
1786                                                 $output .= '<i><b>' . $buffer . '</b>';
1787                                                 $state = 'i';
1788                                         } else { // $state can be 'i' or ''
1789                                                 $output .= '<b>';
1790                                                 $state .= 'b';
1791                                         }
1792                                 } elseif ( $thislen == 5 ) {
1793                                         if ( $state === 'b' ) {
1794                                                 $output .= '</b><i>';
1795                                                 $state = 'i';
1796                                         } elseif ( $state === 'i' ) {
1797                                                 $output .= '</i><b>';
1798                                                 $state = 'b';
1799                                         } elseif ( $state === 'bi' ) {
1800                                                 $output .= '</i></b>';
1801                                                 $state = '';
1802                                         } elseif ( $state === 'ib' ) {
1803                                                 $output .= '</b></i>';
1804                                                 $state = '';
1805                                         } elseif ( $state === 'both' ) {
1806                                                 $output .= '<i><b>' . $buffer . '</b></i>';
1807                                                 $state = '';
1808                                         } else { // ($state == '')
1809                                                 $buffer = '';
1810                                                 $state = 'both';
1811                                         }
1812                                 }
1813                         }
1814                         $i++;
1815                 }
1816                 // Now close all remaining tags.  Notice that the order is important.
1817                 if ( $state === 'b' || $state === 'ib' ) {
1818                         $output .= '</b>';
1819                 }
1820                 if ( $state === 'i' || $state === 'bi' || $state === 'ib' ) {
1821                         $output .= '</i>';
1822                 }
1823                 if ( $state === 'bi' ) {
1824                         $output .= '</b>';
1825                 }
1826                 // There might be lonely ''''', so make sure we have a buffer
1827                 if ( $state === 'both' && $buffer ) {
1828                         $output .= '<b><i>' . $buffer . '</i></b>';
1829                 }
1830                 return $output;
1831         }
1832
1833         /**
1834          * Replace external links (REL)
1835          *
1836          * Note: this is all very hackish and the order of execution matters a lot.
1837          * Make sure to run tests/parser/parserTests.php if you change this code.
1838          *
1839          * @private
1840          *
1841          * @param string $text
1842          *
1843          * @throws MWException
1844          * @return string
1845          */
1846         public function replaceExternalLinks( $text ) {
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
1880                         $linktype = '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                         $this->mOutput->addExternalLink( $url );
1907                 }
1908
1909                 return $s;
1910         }
1911
1912         /**
1913          * Get the rel attribute for a particular external link.
1914          *
1915          * @since 1.21
1916          * @param string|bool $url Optional URL, to extract the domain from for rel =>
1917          *   nofollow if appropriate
1918          * @param Title $title Optional Title, for wgNoFollowNsExceptions lookups
1919          * @return string|null Rel attribute for $url
1920          */
1921         public static function getExternalLinkRel( $url = false, $title = null ) {
1922                 global $wgNoFollowLinks, $wgNoFollowNsExceptions, $wgNoFollowDomainExceptions;
1923                 $ns = $title ? $title->getNamespace() : false;
1924                 if ( $wgNoFollowLinks && !in_array( $ns, $wgNoFollowNsExceptions )
1925                         && !wfMatchesDomainList( $url, $wgNoFollowDomainExceptions )
1926                 ) {
1927                         return 'nofollow';
1928                 }
1929                 return null;
1930         }
1931
1932         /**
1933          * Get an associative array of additional HTML attributes appropriate for a
1934          * particular external link.  This currently may include rel => nofollow
1935          * (depending on configuration, namespace, and the URL's domain) and/or a
1936          * target attribute (depending on configuration).
1937          *
1938          * @param string $url URL to extract the domain from for rel =>
1939          *   nofollow if appropriate
1940          * @return array Associative array of HTML attributes
1941          */
1942         public function getExternalLinkAttribs( $url ) {
1943                 $attribs = [];
1944                 $rel = self::getExternalLinkRel( $url, $this->mTitle );
1945
1946                 $target = $this->mOptions->getExternalLinkTarget();
1947                 if ( $target ) {
1948                         $attribs['target'] = $target;
1949                         if ( !in_array( $target, [ '_self', '_parent', '_top' ] ) ) {
1950                                 // T133507. New windows can navigate parent cross-origin.
1951                                 // Including noreferrer due to lacking browser
1952                                 // support of noopener. Eventually noreferrer should be removed.
1953                                 if ( $rel !== '' ) {
1954                                         $rel .= ' ';
1955                                 }
1956                                 $rel .= 'noreferrer noopener';
1957                         }
1958                 }
1959                 $attribs['rel'] = $rel;
1960                 return $attribs;
1961         }
1962
1963         /**
1964          * Replace unusual escape codes in a URL with their equivalent characters
1965          *
1966          * This generally follows the syntax defined in RFC 3986, with special
1967          * consideration for HTTP query strings.
1968          *
1969          * @param string $url
1970          * @return string
1971          */
1972         public static function normalizeLinkUrl( $url ) {
1973                 # First, make sure unsafe characters are encoded
1974                 $url = preg_replace_callback( '/[\x00-\x20"<>\[\\\\\]^`{|}\x7F-\xFF]/',
1975                         function ( $m ) {
1976                                 return rawurlencode( $m[0] );
1977                         },
1978                         $url
1979                 );
1980
1981                 $ret = '';
1982                 $end = strlen( $url );
1983
1984                 # Fragment part - 'fragment'
1985                 $start = strpos( $url, '#' );
1986                 if ( $start !== false && $start < $end ) {
1987                         $ret = self::normalizeUrlComponent(
1988                                 substr( $url, $start, $end - $start ), '"#%<>[\]^`{|}' ) . $ret;
1989                         $end = $start;
1990                 }
1991
1992                 # Query part - 'query' minus &=+;
1993                 $start = strpos( $url, '?' );
1994                 if ( $start !== false && $start < $end ) {
1995                         $ret = self::normalizeUrlComponent(
1996                                 substr( $url, $start, $end - $start ), '"#%<>[\]^`{|}&=+;' ) . $ret;
1997                         $end = $start;
1998                 }
1999
2000                 # Scheme and path part - 'pchar'
2001                 # (we assume no userinfo or encoded colons in the host)
2002                 $ret = self::normalizeUrlComponent(
2003                         substr( $url, 0, $end ), '"#%<>[\]^`{|}/?' ) . $ret;
2004
2005                 return $ret;
2006         }
2007
2008         private static function normalizeUrlComponent( $component, $unsafe ) {
2009                 $callback = function ( $matches ) use ( $unsafe ) {
2010                         $char = urldecode( $matches[0] );
2011                         $ord = ord( $char );
2012                         if ( $ord > 32 && $ord < 127 && strpos( $unsafe, $char ) === false ) {
2013                                 # Unescape it
2014                                 return $char;
2015                         } else {
2016                                 # Leave it escaped, but use uppercase for a-f
2017                                 return strtoupper( $matches[0] );
2018                         }
2019                 };
2020                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/', $callback, $component );
2021         }
2022
2023         /**
2024          * make an image if it's allowed, either through the global
2025          * option, through the exception, or through the on-wiki whitelist
2026          *
2027          * @param string $url
2028          *
2029          * @return string
2030          */
2031         private function maybeMakeExternalImage( $url ) {
2032                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
2033                 $imagesexception = !empty( $imagesfrom );
2034                 $text = false;
2035                 # $imagesfrom could be either a single string or an array of strings, parse out the latter
2036                 if ( $imagesexception && is_array( $imagesfrom ) ) {
2037                         $imagematch = false;
2038                         foreach ( $imagesfrom as $match ) {
2039                                 if ( strpos( $url, $match ) === 0 ) {
2040                                         $imagematch = true;
2041                                         break;
2042                                 }
2043                         }
2044                 } elseif ( $imagesexception ) {
2045                         $imagematch = ( strpos( $url, $imagesfrom ) === 0 );
2046                 } else {
2047                         $imagematch = false;
2048                 }
2049
2050                 if ( $this->mOptions->getAllowExternalImages()
2051                         || ( $imagesexception && $imagematch )
2052                 ) {
2053                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
2054                                 # Image found
2055                                 $text = Linker::makeExternalImage( $url );
2056                         }
2057                 }
2058                 if ( !$text && $this->mOptions->getEnableImageWhitelist()
2059                         && preg_match( self::EXT_IMAGE_REGEX, $url )
2060                 ) {
2061                         $whitelist = explode(
2062                                 "\n",
2063                                 wfMessage( 'external_image_whitelist' )->inContentLanguage()->text()
2064                         );
2065
2066                         foreach ( $whitelist as $entry ) {
2067                                 # Sanitize the regex fragment, make it case-insensitive, ignore blank entries/comments
2068                                 if ( strpos( $entry, '#' ) === 0 || $entry === '' ) {
2069                                         continue;
2070                                 }
2071                                 if ( preg_match( '/' . str_replace( '/', '\\/', $entry ) . '/i', $url ) ) {
2072                                         # Image matches a whitelist entry
2073                                         $text = Linker::makeExternalImage( $url );
2074                                         break;
2075                                 }
2076                         }
2077                 }
2078                 return $text;
2079         }
2080
2081         /**
2082          * Process [[ ]] wikilinks
2083          *
2084          * @param string $s
2085          *
2086          * @return string Processed text
2087          *
2088          * @private
2089          */
2090         public function replaceInternalLinks( $s ) {
2091                 $this->mLinkHolders->merge( $this->replaceInternalLinks2( $s ) );
2092                 return $s;
2093         }
2094
2095         /**
2096          * Process [[ ]] wikilinks (RIL)
2097          * @param string &$s
2098          * @throws MWException
2099          * @return LinkHolderArray
2100          *
2101          * @private
2102          */
2103         public function replaceInternalLinks2( &$s ) {
2104                 global $wgExtraInterlanguageLinkPrefixes;
2105
2106                 static $tc = false, $e1, $e1_img;
2107                 # the % is needed to support urlencoded titles as well
2108                 if ( !$tc ) {
2109                         $tc = Title::legalChars() . '#%';
2110                         # Match a link having the form [[namespace:link|alternate]]trail
2111                         $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD";
2112                         # Match cases where there is no "]]", which might still be images
2113                         $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD";
2114                 }
2115
2116                 $holders = new LinkHolderArray( $this );
2117
2118                 # split the entire text string on occurrences of [[
2119                 $a = StringUtils::explode( '[[', ' ' . $s );
2120                 # get the first element (all text up to first [[), and remove the space we added
2121                 $s = $a->current();
2122                 $a->next();
2123                 $line = $a->current(); # Workaround for broken ArrayIterator::next() that returns "void"
2124                 $s = substr( $s, 1 );
2125
2126                 $useLinkPrefixExtension = $this->getTargetLanguage()->linkPrefixExtension();
2127                 $e2 = null;
2128                 if ( $useLinkPrefixExtension ) {
2129                         # Match the end of a line for a word that's not followed by whitespace,
2130                         # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
2131                         global $wgContLang;
2132                         $charset = $wgContLang->linkPrefixCharset();
2133                         $e2 = "/^((?>.*[^$charset]|))(.+)$/sDu";
2134                 }
2135
2136                 if ( is_null( $this->mTitle ) ) {
2137                         throw new MWException( __METHOD__ . ": \$this->mTitle is null\n" );
2138                 }
2139                 $nottalk = !$this->mTitle->isTalkPage();
2140
2141                 if ( $useLinkPrefixExtension ) {
2142                         $m = [];
2143                         if ( preg_match( $e2, $s, $m ) ) {
2144                                 $first_prefix = $m[2];
2145                         } else {
2146                                 $first_prefix = false;
2147                         }
2148                 } else {
2149                         $prefix = '';
2150                 }
2151
2152                 $useSubpages = $this->areSubpagesAllowed();
2153
2154                 # Loop for each link
2155                 for ( ; $line !== false && $line !== null; $a->next(), $line = $a->current() ) {
2156                         # Check for excessive memory usage
2157                         if ( $holders->isBig() ) {
2158                                 # Too big
2159                                 # Do the existence check, replace the link holders and clear the array
2160                                 $holders->replace( $s );
2161                                 $holders->clear();
2162                         }
2163
2164                         if ( $useLinkPrefixExtension ) {
2165                                 if ( preg_match( $e2, $s, $m ) ) {
2166                                         $prefix = $m[2];
2167                                         $s = $m[1];
2168                                 } else {
2169                                         $prefix = '';
2170                                 }
2171                                 # first link
2172                                 if ( $first_prefix ) {
2173                                         $prefix = $first_prefix;
2174                                         $first_prefix = false;
2175                                 }
2176                         }
2177
2178                         $might_be_img = false;
2179
2180                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
2181                                 $text = $m[2];
2182                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
2183                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
2184                                 # the real problem is with the $e1 regex
2185                                 # See T1500.
2186                                 # Still some problems for cases where the ] is meant to be outside punctuation,
2187                                 # and no image is in sight. See T4095.
2188                                 if ( $text !== ''
2189                                         && substr( $m[3], 0, 1 ) === ']'
2190                                         && strpos( $text, '[' ) !== false
2191                                 ) {
2192                                         $text .= ']'; # so that replaceExternalLinks($text) works later
2193                                         $m[3] = substr( $m[3], 1 );
2194                                 }
2195                                 # fix up urlencoded title texts
2196                                 if ( strpos( $m[1], '%' ) !== false ) {
2197                                         # Should anchors '#' also be rejected?
2198                                         $m[1] = str_replace( [ '<', '>' ], [ '&lt;', '&gt;' ], rawurldecode( $m[1] ) );
2199                                 }
2200                                 $trail = $m[3];
2201                         } elseif ( preg_match( $e1_img, $line, $m ) ) {
2202                                 # Invalid, but might be an image with a link in its caption
2203                                 $might_be_img = true;
2204                                 $text = $m[2];
2205                                 if ( strpos( $m[1], '%' ) !== false ) {
2206                                         $m[1] = str_replace( [ '<', '>' ], [ '&lt;', '&gt;' ], rawurldecode( $m[1] ) );
2207                                 }
2208                                 $trail = "";
2209                         } else { # Invalid form; output directly
2210                                 $s .= $prefix . '[[' . $line;
2211                                 continue;
2212                         }
2213
2214                         $origLink = ltrim( $m[1], ' ' );
2215
2216                         # Don't allow internal links to pages containing
2217                         # PROTO: where PROTO is a valid URL protocol; these
2218                         # should be external links.
2219                         if ( preg_match( '/^(?i:' . $this->mUrlProtocols . ')/', $origLink ) ) {
2220                                 $s .= $prefix . '[[' . $line;
2221                                 continue;
2222                         }
2223
2224                         # Make subpage if necessary
2225                         if ( $useSubpages ) {
2226                                 $link = $this->maybeDoSubpageLink( $origLink, $text );
2227                         } else {
2228                                 $link = $origLink;
2229                         }
2230
2231                         // \x7f isn't a default legal title char, so most likely strip
2232                         // markers will force us into the "invalid form" path above.  But,
2233                         // just in case, let's assert that xmlish tags aren't valid in
2234                         // the title position.
2235                         $unstrip = $this->mStripState->killMarkers( $link );
2236                         $noMarkers = ( $unstrip === $link );
2237
2238                         $nt = $noMarkers ? Title::newFromText( $link ) : null;
2239                         if ( $nt === null ) {
2240                                 $s .= $prefix . '[[' . $line;
2241                                 continue;
2242                         }
2243
2244                         $ns = $nt->getNamespace();
2245                         $iw = $nt->getInterwiki();
2246
2247                         $noforce = ( substr( $origLink, 0, 1 ) !== ':' );
2248
2249                         if ( $might_be_img ) { # if this is actually an invalid link
2250                                 if ( $ns == NS_FILE && $noforce ) { # but might be an image
2251                                         $found = false;
2252                                         while ( true ) {
2253                                                 # look at the next 'line' to see if we can close it there
2254                                                 $a->next();
2255                                                 $next_line = $a->current();
2256                                                 if ( $next_line === false || $next_line === null ) {
2257                                                         break;
2258                                                 }
2259                                                 $m = explode( ']]', $next_line, 3 );
2260                                                 if ( count( $m ) == 3 ) {
2261                                                         # the first ]] closes the inner link, the second the image
2262                                                         $found = true;
2263                                                         $text .= "[[{$m[0]}]]{$m[1]}";
2264                                                         $trail = $m[2];
2265                                                         break;
2266                                                 } elseif ( count( $m ) == 2 ) {
2267                                                         # if there's exactly one ]] that's fine, we'll keep looking
2268                                                         $text .= "[[{$m[0]}]]{$m[1]}";
2269                                                 } else {
2270                                                         # if $next_line is invalid too, we need look no further
2271                                                         $text .= '[[' . $next_line;
2272                                                         break;
2273                                                 }
2274                                         }
2275                                         if ( !$found ) {
2276                                                 # we couldn't find the end of this imageLink, so output it raw
2277                                                 # but don't ignore what might be perfectly normal links in the text we've examined
2278                                                 $holders->merge( $this->replaceInternalLinks2( $text ) );
2279                                                 $s .= "{$prefix}[[$link|$text";
2280                                                 # note: no $trail, because without an end, there *is* no trail
2281                                                 continue;
2282                                         }
2283                                 } else { # it's not an image, so output it raw
2284                                         $s .= "{$prefix}[[$link|$text";
2285                                         # note: no $trail, because without an end, there *is* no trail
2286                                         continue;
2287                                 }
2288                         }
2289
2290                         $wasblank = ( $text == '' );
2291                         if ( $wasblank ) {
2292                                 $text = $link;
2293                                 if ( !$noforce ) {
2294                                         # Strip off leading ':'
2295                                         $text = substr( $text, 1 );
2296                                 }
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                                         /**
2321                                          * Strip the whitespace interwiki links produce, see T10897
2322                                          */
2323                                         $s = rtrim( $s . $prefix ) . $trail; # T175416
2324                                         continue;
2325                                 }
2326
2327                                 if ( $ns == NS_FILE ) {
2328                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
2329                                                 if ( $wasblank ) {
2330                                                         # if no parameters were passed, $text
2331                                                         # becomes something like "File:Foo.png",
2332                                                         # which we don't want to pass on to the
2333                                                         # image generator
2334                                                         $text = '';
2335                                                 } else {
2336                                                         # recursively parse links inside the image caption
2337                                                         # actually, this will parse them in any other parameters, too,
2338                                                         # but it might be hard to fix that, and it doesn't matter ATM
2339                                                         $text = $this->replaceExternalLinks( $text );
2340                                                         $holders->merge( $this->replaceInternalLinks2( $text ) );
2341                                                 }
2342                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
2343                                                 $s .= $prefix . $this->armorLinks(
2344                                                         $this->makeImage( $nt, $text, $holders ) ) . $trail;
2345                                                 continue;
2346                                         }
2347                                 } elseif ( $ns == NS_CATEGORY ) {
2348                                         /**
2349                                          * Strip the whitespace Category links produce, see T2087
2350                                          */
2351                                         $s = rtrim( $s . $prefix ) . $trail; # T2087, T87753
2352
2353                                         if ( $wasblank ) {
2354                                                 $sortkey = $this->getDefaultSort();
2355                                         } else {
2356                                                 $sortkey = $text;
2357                                         }
2358                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
2359                                         $sortkey = str_replace( "\n", '', $sortkey );
2360                                         $sortkey = $this->getConverterLanguage()->convertCategoryKey( $sortkey );
2361                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
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 string $index Magic variable identifier as mapped in MagicWord::$mVariableIDs
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' ), true );
2529                                 break;
2530                         case 'currentmonth1':
2531                                 $value = $pageLang->formatNum( MWTimestamp::getInstance( $ts )->format( 'n' ), true );
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' ), true );
2544                                 break;
2545                         case 'currentday2':
2546                                 $value = $pageLang->formatNum( MWTimestamp::getInstance( $ts )->format( 'd' ), true );
2547                                 break;
2548                         case 'localmonth':
2549                                 $value = $pageLang->formatNum( MWTimestamp::getLocalInstance( $ts )->format( 'm' ), true );
2550                                 break;
2551                         case 'localmonth1':
2552                                 $value = $pageLang->formatNum( MWTimestamp::getLocalInstance( $ts )->format( 'n' ), true );
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' ), true );
2565                                 break;
2566                         case 'localday2':
2567                                 $value = $pageLang->formatNum( MWTimestamp::getLocalInstance( $ts )->format( 'd' ), true );
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->canHaveTalkPage() ) {
2609                                         $talkPage = $this->mTitle->getTalkPage();
2610                                         $value = wfEscapeWikiText( $talkPage->getPrefixedText() );
2611                                 } else {
2612                                         $value = '';
2613                                 }
2614                                 break;
2615                         case 'talkpagenamee':
2616                                 if ( $this->mTitle->canHaveTalkPage() ) {
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->canHaveTalkPage()
2717                                         ? str_replace( '_', ' ', $this->mTitle->getTalkNsText() )
2718                                         : '';
2719                                 break;
2720                         case 'talkspacee':
2721                                 $value = $this->mTitle->canHaveTalkPage() ? 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                 // Flags
3026
3027                 // $text has been filled
3028                 $found = false;
3029                 // wiki markup in $text should be escaped
3030                 $nowiki = false;
3031                 // $text is HTML, armour it against wikitext transformation
3032                 $isHTML = false;
3033                 // Force interwiki transclusion to be done in raw mode not rendered
3034                 $forceRawInterwiki = false;
3035                 // $text is a DOM node needing expansion in a child frame
3036                 $isChildObj = false;
3037                 // $text is a DOM node needing expansion in the current frame
3038                 $isLocalObj = false;
3039
3040                 # Title object, where $text came from
3041                 $title = false;
3042
3043                 # $part1 is the bit before the first |, and must contain only title characters.
3044                 # Various prefixes will be stripped from it later.
3045                 $titleWithSpaces = $frame->expand( $piece['title'] );
3046                 $part1 = trim( $titleWithSpaces );
3047                 $titleText = false;
3048
3049                 # Original title text preserved for various purposes
3050                 $originalTitle = $part1;
3051
3052                 # $args is a list of argument nodes, starting from index 0, not including $part1
3053                 # @todo FIXME: If piece['parts'] is null then the call to getLength()
3054                 # below won't work b/c this $args isn't an object
3055                 $args = ( null == $piece['parts'] ) ? [] : $piece['parts'];
3056
3057                 $profileSection = null; // profile templates
3058
3059                 # SUBST
3060                 if ( !$found ) {
3061                         $substMatch = $this->mSubstWords->matchStartAndRemove( $part1 );
3062
3063                         # Possibilities for substMatch: "subst", "safesubst" or FALSE
3064                         # Decide whether to expand template or keep wikitext as-is.
3065                         if ( $this->ot['wiki'] ) {
3066                                 if ( $substMatch === false ) {
3067                                         $literal = true;  # literal when in PST with no prefix
3068                                 } else {
3069                                         $literal = false; # expand when in PST with subst: or safesubst:
3070                                 }
3071                         } else {
3072                                 if ( $substMatch == 'subst' ) {
3073                                         $literal = true;  # literal when not in PST with plain subst:
3074                                 } else {
3075                                         $literal = false; # expand when not in PST with safesubst: or no prefix
3076                                 }
3077                         }
3078                         if ( $literal ) {
3079                                 $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
3080                                 $isLocalObj = true;
3081                                 $found = true;
3082                         }
3083                 }
3084
3085                 # Variables
3086                 if ( !$found && $args->getLength() == 0 ) {
3087                         $id = $this->mVariables->matchStartToEnd( $part1 );
3088                         if ( $id !== false ) {
3089                                 $text = $this->getVariableValue( $id, $frame );
3090                                 if ( MagicWord::getCacheTTL( $id ) > -1 ) {
3091                                         $this->mOutput->updateCacheExpiry( MagicWord::getCacheTTL( $id ) );
3092                                 }
3093                                 $found = true;
3094                         }
3095                 }
3096
3097                 # MSG, MSGNW and RAW
3098                 if ( !$found ) {
3099                         # Check for MSGNW:
3100                         $mwMsgnw = MagicWord::get( 'msgnw' );
3101                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
3102                                 $nowiki = true;
3103                         } else {
3104                                 # Remove obsolete MSG:
3105                                 $mwMsg = MagicWord::get( 'msg' );
3106                                 $mwMsg->matchStartAndRemove( $part1 );
3107                         }
3108
3109                         # Check for RAW:
3110                         $mwRaw = MagicWord::get( 'raw' );
3111                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
3112                                 $forceRawInterwiki = true;
3113                         }
3114                 }
3115
3116                 # Parser functions
3117                 if ( !$found ) {
3118                         $colonPos = strpos( $part1, ':' );
3119                         if ( $colonPos !== false ) {
3120                                 $func = substr( $part1, 0, $colonPos );
3121                                 $funcArgs = [ trim( substr( $part1, $colonPos + 1 ) ) ];
3122                                 $argsLength = $args->getLength();
3123                                 for ( $i = 0; $i < $argsLength; $i++ ) {
3124                                         $funcArgs[] = $args->item( $i );
3125                                 }
3126                                 try {
3127                                         $result = $this->callParserFunction( $frame, $func, $funcArgs );
3128                                 } catch ( Exception $ex ) {
3129                                         throw $ex;
3130                                 }
3131
3132                                 // Extract any forwarded flags
3133                                 if ( isset( $result['title'] ) ) {
3134                                         $title = $result['title'];
3135                                 }
3136                                 if ( isset( $result['found'] ) ) {
3137                                         $found = $result['found'];
3138                                 }
3139                                 if ( array_key_exists( 'text', $result ) ) {
3140                                         // a string or null
3141                                         $text = $result['text'];
3142                                 }
3143                                 if ( isset( $result['nowiki'] ) ) {
3144                                         $nowiki = $result['nowiki'];
3145                                 }
3146                                 if ( isset( $result['isHTML'] ) ) {
3147                                         $isHTML = $result['isHTML'];
3148                                 }
3149                                 if ( isset( $result['forceRawInterwiki'] ) ) {
3150                                         $forceRawInterwiki = $result['forceRawInterwiki'];
3151                                 }
3152                                 if ( isset( $result['isChildObj'] ) ) {
3153                                         $isChildObj = $result['isChildObj'];
3154                                 }
3155                                 if ( isset( $result['isLocalObj'] ) ) {
3156                                         $isLocalObj = $result['isLocalObj'];
3157                                 }
3158                         }
3159                 }
3160
3161                 # Finish mangling title and then check for loops.
3162                 # Set $title to a Title object and $titleText to the PDBK
3163                 if ( !$found ) {
3164                         $ns = NS_TEMPLATE;
3165                         # Split the title into page and subpage
3166                         $subpage = '';
3167                         $relative = $this->maybeDoSubpageLink( $part1, $subpage );
3168                         if ( $part1 !== $relative ) {
3169                                 $part1 = $relative;
3170                                 $ns = $this->mTitle->getNamespace();
3171                         }
3172                         $title = Title::newFromText( $part1, $ns );
3173                         if ( $title ) {
3174                                 $titleText = $title->getPrefixedText();
3175                                 # Check for language variants if the template is not found
3176                                 if ( $this->getConverterLanguage()->hasVariants() && $title->getArticleID() == 0 ) {
3177                                         $this->getConverterLanguage()->findVariantLink( $part1, $title, true );
3178                                 }
3179                                 # Do recursion depth check
3180                                 $limit = $this->mOptions->getMaxTemplateDepth();
3181                                 if ( $frame->depth >= $limit ) {
3182                                         $found = true;
3183                                         $text = '<span class="error">'
3184                                                 . wfMessage( 'parser-template-recursion-depth-warning' )
3185                                                         ->numParams( $limit )->inContentLanguage()->text()
3186                                                 . '</span>';
3187                                 }
3188                         }
3189                 }
3190
3191                 # Load from database
3192                 if ( !$found && $title ) {
3193                         $profileSection = $this->mProfiler->scopedProfileIn( $title->getPrefixedDBkey() );
3194                         if ( !$title->isExternal() ) {
3195                                 if ( $title->isSpecialPage()
3196                                         && $this->mOptions->getAllowSpecialInclusion()
3197                                         && $this->ot['html']
3198                                 ) {
3199                                         $specialPage = SpecialPageFactory::getPage( $title->getDBkey() );
3200                                         // Pass the template arguments as URL parameters.
3201                                         // "uselang" will have no effect since the Language object
3202                                         // is forced to the one defined in ParserOptions.
3203                                         $pageArgs = [];
3204                                         $argsLength = $args->getLength();
3205                                         for ( $i = 0; $i < $argsLength; $i++ ) {
3206                                                 $bits = $args->item( $i )->splitArg();
3207                                                 if ( strval( $bits['index'] ) === '' ) {
3208                                                         $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
3209                                                         $value = trim( $frame->expand( $bits['value'] ) );
3210                                                         $pageArgs[$name] = $value;
3211                                                 }
3212                                         }
3213
3214                                         // Create a new context to execute the special page
3215                                         $context = new RequestContext;
3216                                         $context->setTitle( $title );
3217                                         $context->setRequest( new FauxRequest( $pageArgs ) );
3218                                         if ( $specialPage && $specialPage->maxIncludeCacheTime() === 0 ) {
3219                                                 $context->setUser( $this->getUser() );
3220                                         } else {
3221                                                 // If this page is cached, then we better not be per user.
3222                                                 $context->setUser( User::newFromName( '127.0.0.1', false ) );
3223                                         }
3224                                         $context->setLanguage( $this->mOptions->getUserLangObj() );
3225                                         $ret = SpecialPageFactory::capturePath(
3226                                                 $title, $context, $this->getLinkRenderer() );
3227                                         if ( $ret ) {
3228                                                 $text = $context->getOutput()->getHTML();
3229                                                 $this->mOutput->addOutputPageMetadata( $context->getOutput() );
3230                                                 $found = true;
3231                                                 $isHTML = true;
3232                                                 if ( $specialPage && $specialPage->maxIncludeCacheTime() !== false ) {
3233                                                         $this->mOutput->updateRuntimeAdaptiveExpiry(
3234                                                                 $specialPage->maxIncludeCacheTime()
3235                                                         );
3236                                                 }
3237                                         }
3238                                 } elseif ( MWNamespace::isNonincludable( $title->getNamespace() ) ) {
3239                                         $found = false; # access denied
3240                                         wfDebug( __METHOD__ . ": template inclusion denied for " .
3241                                                 $title->getPrefixedDBkey() . "\n" );
3242                                 } else {
3243                                         list( $text, $title ) = $this->getTemplateDom( $title );
3244                                         if ( $text !== false ) {
3245                                                 $found = true;
3246                                                 $isChildObj = true;
3247                                         }
3248                                 }
3249
3250                                 # If the title is valid but undisplayable, make a link to it
3251                                 if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3252                                         $text = "[[:$titleText]]";
3253                                         $found = true;
3254                                 }
3255                         } elseif ( $title->isTrans() ) {
3256                                 # Interwiki transclusion
3257                                 if ( $this->ot['html'] && !$forceRawInterwiki ) {
3258                                         $text = $this->interwikiTransclude( $title, 'render' );
3259                                         $isHTML = true;
3260                                 } else {
3261                                         $text = $this->interwikiTransclude( $title, 'raw' );
3262                                         # Preprocess it like a template
3263                                         $text = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3264                                         $isChildObj = true;
3265                                 }
3266                                 $found = true;
3267                         }
3268
3269                         # Do infinite loop check
3270                         # This has to be done after redirect resolution to avoid infinite loops via redirects
3271                         if ( !$frame->loopCheck( $title ) ) {
3272                                 $found = true;
3273                                 $text = '<span class="error">'
3274                                         . wfMessage( 'parser-template-loop-warning', $titleText )->inContentLanguage()->text()
3275                                         . '</span>';
3276                                 $this->addTrackingCategory( 'template-loop-category' );
3277                                 $this->mOutput->addWarning( wfMessage( 'template-loop-warning',
3278                                         wfEscapeWikiText( $titleText ) )->text() );
3279                                 wfDebug( __METHOD__ . ": template loop broken at '$titleText'\n" );
3280                         }
3281                 }
3282
3283                 # If we haven't found text to substitute by now, we're done
3284                 # Recover the source wikitext and return it
3285                 if ( !$found ) {
3286                         $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
3287                         if ( $profileSection ) {
3288                                 $this->mProfiler->scopedProfileOut( $profileSection );
3289                         }
3290                         return [ 'object' => $text ];
3291                 }
3292
3293                 # Expand DOM-style return values in a child frame
3294                 if ( $isChildObj ) {
3295                         # Clean up argument array
3296                         $newFrame = $frame->newChild( $args, $title );
3297
3298                         if ( $nowiki ) {
3299                                 $text = $newFrame->expand( $text, PPFrame::RECOVER_ORIG );
3300                         } elseif ( $titleText !== false && $newFrame->isEmpty() ) {
3301                                 # Expansion is eligible for the empty-frame cache
3302                                 $text = $newFrame->cachedExpand( $titleText, $text );
3303                         } else {
3304                                 # Uncached expansion
3305                                 $text = $newFrame->expand( $text );
3306                         }
3307                 }
3308                 if ( $isLocalObj && $nowiki ) {
3309                         $text = $frame->expand( $text, PPFrame::RECOVER_ORIG );
3310                         $isLocalObj = false;
3311                 }
3312
3313                 if ( $profileSection ) {
3314                         $this->mProfiler->scopedProfileOut( $profileSection );
3315                 }
3316
3317                 # Replace raw HTML by a placeholder
3318                 if ( $isHTML ) {
3319                         $text = $this->insertStripItem( $text );
3320                 } elseif ( $nowiki && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3321                         # Escape nowiki-style return values
3322                         $text = wfEscapeWikiText( $text );
3323                 } elseif ( is_string( $text )
3324                         && !$piece['lineStart']
3325                         && preg_match( '/^(?:{\\||:|;|#|\*)/', $text )
3326                 ) {
3327                         # T2529: if the template begins with a table or block-level
3328                         # element, it should be treated as beginning a new line.
3329                         # This behavior is somewhat controversial.
3330                         $text = "\n" . $text;
3331                 }
3332
3333                 if ( is_string( $text ) && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3334                         # Error, oversize inclusion
3335                         if ( $titleText !== false ) {
3336                                 # Make a working, properly escaped link if possible (T25588)
3337                                 $text = "[[:$titleText]]";
3338                         } else {
3339                                 # This will probably not be a working link, but at least it may
3340                                 # provide some hint of where the problem is
3341                                 preg_replace( '/^:/', '', $originalTitle );
3342                                 $text = "[[:$originalTitle]]";
3343                         }
3344                         $text .= $this->insertStripItem( '<!-- WARNING: template omitted, '
3345                                 . 'post-expand include size too large -->' );
3346                         $this->limitationWarn( 'post-expand-template-inclusion' );
3347                 }
3348
3349                 if ( $isLocalObj ) {
3350                         $ret = [ 'object' => $text ];
3351                 } else {
3352                         $ret = [ 'text' => $text ];
3353                 }
3354
3355                 return $ret;
3356         }
3357
3358         /**
3359          * Call a parser function and return an array with text and flags.
3360          *
3361          * The returned array will always contain a boolean 'found', indicating
3362          * whether the parser function was found or not. It may also contain the
3363          * following:
3364          *  text: string|object, resulting wikitext or PP DOM object
3365          *  isHTML: bool, $text is HTML, armour it against wikitext transformation
3366          *  isChildObj: bool, $text is a DOM node needing expansion in a child frame
3367          *  isLocalObj: bool, $text is a DOM node needing expansion in the current frame
3368          *  nowiki: bool, wiki markup in $text should be escaped
3369          *
3370          * @since 1.21
3371          * @param PPFrame $frame The current frame, contains template arguments
3372          * @param string $function Function name
3373          * @param array $args Arguments to the function
3374          * @throws MWException
3375          * @return array
3376          */
3377         public function callParserFunction( $frame, $function, array $args = [] ) {
3378                 global $wgContLang;
3379
3380                 # Case sensitive functions
3381                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
3382                         $function = $this->mFunctionSynonyms[1][$function];
3383                 } else {
3384                         # Case insensitive functions
3385                         $function = $wgContLang->lc( $function );
3386                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
3387                                 $function = $this->mFunctionSynonyms[0][$function];
3388                         } else {
3389                                 return [ 'found' => false ];
3390                         }
3391                 }
3392
3393                 list( $callback, $flags ) = $this->mFunctionHooks[$function];
3394
3395                 // Avoid PHP 7.1 warning from passing $this by reference
3396                 $parser = $this;
3397
3398                 $allArgs = [ &$parser ];
3399                 if ( $flags & self::SFH_OBJECT_ARGS ) {
3400                         # Convert arguments to PPNodes and collect for appending to $allArgs
3401                         $funcArgs = [];
3402                         foreach ( $args as $k => $v ) {
3403                                 if ( $v instanceof PPNode || $k === 0 ) {
3404                                         $funcArgs[] = $v;
3405                                 } else {
3406                                         $funcArgs[] = $this->mPreprocessor->newPartNodeArray( [ $k => $v ] )->item( 0 );
3407                                 }
3408                         }
3409
3410                         # Add a frame parameter, and pass the arguments as an array
3411                         $allArgs[] = $frame;
3412                         $allArgs[] = $funcArgs;
3413                 } else {
3414                         # Convert arguments to plain text and append to $allArgs
3415                         foreach ( $args as $k => $v ) {
3416                                 if ( $v instanceof PPNode ) {
3417                                         $allArgs[] = trim( $frame->expand( $v ) );
3418                                 } elseif ( is_int( $k ) && $k >= 0 ) {
3419                                         $allArgs[] = trim( $v );
3420                                 } else {
3421                                         $allArgs[] = trim( "$k=$v" );
3422                                 }
3423                         }
3424                 }
3425
3426                 $result = call_user_func_array( $callback, $allArgs );
3427
3428                 # The interface for function hooks allows them to return a wikitext
3429                 # string or an array containing the string and any flags. This mungs
3430                 # things around to match what this method should return.
3431                 if ( !is_array( $result ) ) {
3432                         $result = [
3433                                 'found' => true,
3434                                 'text' => $result,
3435                         ];
3436                 } else {
3437                         if ( isset( $result[0] ) && !isset( $result['text'] ) ) {
3438                                 $result['text'] = $result[0];
3439                         }
3440                         unset( $result[0] );
3441                         $result += [
3442                                 'found' => true,
3443                         ];
3444                 }
3445
3446                 $noparse = true;
3447                 $preprocessFlags = 0;
3448                 if ( isset( $result['noparse'] ) ) {
3449                         $noparse = $result['noparse'];
3450                 }
3451                 if ( isset( $result['preprocessFlags'] ) ) {
3452                         $preprocessFlags = $result['preprocessFlags'];
3453                 }
3454
3455                 if ( !$noparse ) {
3456                         $result['text'] = $this->preprocessToDom( $result['text'], $preprocessFlags );
3457                         $result['isChildObj'] = true;
3458                 }
3459
3460                 return $result;
3461         }
3462
3463         /**
3464          * Get the semi-parsed DOM representation of a template with a given title,
3465          * and its redirect destination title. Cached.
3466          *
3467          * @param Title $title
3468          *
3469          * @return array
3470          */
3471         public function getTemplateDom( $title ) {
3472                 $cacheTitle = $title;
3473                 $titleText = $title->getPrefixedDBkey();
3474
3475                 if ( isset( $this->mTplRedirCache[$titleText] ) ) {
3476                         list( $ns, $dbk ) = $this->mTplRedirCache[$titleText];
3477                         $title = Title::makeTitle( $ns, $dbk );
3478                         $titleText = $title->getPrefixedDBkey();
3479                 }
3480                 if ( isset( $this->mTplDomCache[$titleText] ) ) {
3481                         return [ $this->mTplDomCache[$titleText], $title ];
3482                 }
3483
3484                 # Cache miss, go to the database
3485                 list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
3486
3487                 if ( $text === false ) {
3488                         $this->mTplDomCache[$titleText] = false;
3489                         return [ false, $title ];
3490                 }
3491
3492                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3493                 $this->mTplDomCache[$titleText] = $dom;
3494
3495                 if ( !$title->equals( $cacheTitle ) ) {
3496                         $this->mTplRedirCache[$cacheTitle->getPrefixedDBkey()] =
3497                                 [ $title->getNamespace(), $title->getDBkey() ];
3498                 }
3499
3500                 return [ $dom, $title ];
3501         }
3502
3503         /**
3504          * Fetch the current revision of a given title. Note that the revision
3505          * (and even the title) may not exist in the database, so everything
3506          * contributing to the output of the parser should use this method
3507          * where possible, rather than getting the revisions themselves. This
3508          * method also caches its results, so using it benefits performance.
3509          *
3510          * @since 1.24
3511          * @param Title $title
3512          * @return Revision
3513          */
3514         public function fetchCurrentRevisionOfTitle( $title ) {
3515                 $cacheKey = $title->getPrefixedDBkey();
3516                 if ( !$this->currentRevisionCache ) {
3517                         $this->currentRevisionCache = new MapCacheLRU( 100 );
3518                 }
3519                 if ( !$this->currentRevisionCache->has( $cacheKey ) ) {
3520                         $this->currentRevisionCache->set( $cacheKey,
3521                                 // Defaults to Parser::statelessFetchRevision()
3522                                 call_user_func( $this->mOptions->getCurrentRevisionCallback(), $title, $this )
3523                         );
3524                 }
3525                 return $this->currentRevisionCache->get( $cacheKey );
3526         }
3527
3528         /**
3529          * Wrapper around Revision::newFromTitle to allow passing additional parameters
3530          * without passing them on to it.
3531          *
3532          * @since 1.24
3533          * @param Title $title
3534          * @param Parser|bool $parser
3535          * @return Revision|bool False if missing
3536          */
3537         public static function statelessFetchRevision( Title $title, $parser = false ) {
3538                 $rev = Revision::newKnownCurrent( wfGetDB( DB_REPLICA ), $title );
3539
3540                 return $rev;
3541         }
3542
3543         /**
3544          * Fetch the unparsed text of a template and register a reference to it.
3545          * @param Title $title
3546          * @return array ( string or false, Title )
3547          */
3548         public function fetchTemplateAndTitle( $title ) {
3549                 // Defaults to Parser::statelessFetchTemplate()
3550                 $templateCb = $this->mOptions->getTemplateCallback();
3551                 $stuff = call_user_func( $templateCb, $title, $this );
3552                 // We use U+007F DELETE to distinguish strip markers from regular text.
3553                 $text = $stuff['text'];
3554                 if ( is_string( $stuff['text'] ) ) {
3555                         $text = strtr( $text, "\x7f", "?" );
3556                 }
3557                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3558                 if ( isset( $stuff['deps'] ) ) {
3559                         foreach ( $stuff['deps'] as $dep ) {
3560                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3561                                 if ( $dep['title']->equals( $this->getTitle() ) ) {
3562                                         // If we transclude ourselves, the final result
3563                                         // will change based on the new version of the page
3564                                         $this->mOutput->setFlag( 'vary-revision' );
3565                                 }
3566                         }
3567                 }
3568                 return [ $text, $finalTitle ];
3569         }
3570
3571         /**
3572          * Fetch the unparsed text of a template and register a reference to it.
3573          * @param Title $title
3574          * @return string|bool
3575          */
3576         public function fetchTemplate( $title ) {
3577                 return $this->fetchTemplateAndTitle( $title )[0];
3578         }
3579
3580         /**
3581          * Static function to get a template
3582          * Can be overridden via ParserOptions::setTemplateCallback().
3583          *
3584          * @param Title $title
3585          * @param bool|Parser $parser
3586          *
3587          * @return array
3588          */
3589         public static function statelessFetchTemplate( $title, $parser = false ) {
3590                 $text = $skip = false;
3591                 $finalTitle = $title;
3592                 $deps = [];
3593
3594                 # Loop to fetch the article, with up to 1 redirect
3595                 // phpcs:ignore Generic.CodeAnalysis.ForLoopWithTestFunctionCall
3596                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3597                         # Give extensions a chance to select the revision instead
3598                         $id = false; # Assume current
3599                         Hooks::run( 'BeforeParserFetchTemplateAndtitle',
3600                                 [ $parser, $title, &$skip, &$id ] );
3601
3602                         if ( $skip ) {
3603                                 $text = false;
3604                                 $deps[] = [
3605                                         'title' => $title,
3606                                         'page_id' => $title->getArticleID(),
3607                                         'rev_id' => null
3608                                 ];
3609                                 break;
3610                         }
3611                         # Get the revision
3612                         if ( $id ) {
3613                                 $rev = Revision::newFromId( $id );
3614                         } elseif ( $parser ) {
3615                                 $rev = $parser->fetchCurrentRevisionOfTitle( $title );
3616                         } else {
3617                                 $rev = Revision::newFromTitle( $title );
3618                         }
3619                         $rev_id = $rev ? $rev->getId() : 0;
3620                         # If there is no current revision, there is no page
3621                         if ( $id === false && !$rev ) {
3622                                 $linkCache = LinkCache::singleton();
3623                                 $linkCache->addBadLinkObj( $title );
3624                         }
3625
3626                         $deps[] = [
3627                                 'title' => $title,
3628                                 'page_id' => $title->getArticleID(),
3629                                 'rev_id' => $rev_id ];
3630                         if ( $rev && !$title->equals( $rev->getTitle() ) ) {
3631                                 # We fetched a rev from a different title; register it too...
3632                                 $deps[] = [
3633                                         'title' => $rev->getTitle(),
3634                                         'page_id' => $rev->getPage(),
3635                                         'rev_id' => $rev_id ];
3636                         }
3637
3638                         if ( $rev ) {
3639                                 $content = $rev->getContent();
3640                                 $text = $content ? $content->getWikitextForTransclusion() : null;
3641
3642                                 Hooks::run( 'ParserFetchTemplate',
3643                                         [ $parser, $title, $rev, &$text, &$deps ] );
3644
3645                                 if ( $text === false || $text === null ) {
3646                                         $text = false;
3647                                         break;
3648                                 }
3649                         } elseif ( $title->getNamespace() == NS_MEDIAWIKI ) {
3650                                 global $wgContLang;
3651                                 $message = wfMessage( $wgContLang->lcfirst( $title->getText() ) )->inContentLanguage();
3652                                 if ( !$message->exists() ) {
3653                                         $text = false;
3654                                         break;
3655                                 }
3656                                 $content = $message->content();
3657                                 $text = $message->plain();
3658                         } else {
3659                                 break;
3660                         }
3661                         if ( !$content ) {
3662                                 break;
3663                         }
3664                         # Redirect?
3665                         $finalTitle = $title;
3666                         $title = $content->getRedirectTarget();
3667                 }
3668                 return [
3669                         'text' => $text,
3670                         'finalTitle' => $finalTitle,
3671                         'deps' => $deps ];
3672         }
3673
3674         /**
3675          * Fetch a file and its title and register a reference to it.
3676          * If 'broken' is a key in $options then the file will appear as a broken thumbnail.
3677          * @param Title $title
3678          * @param array $options Array of options to RepoGroup::findFile
3679          * @return File|bool
3680          */
3681         public function fetchFile( $title, $options = [] ) {
3682                 return $this->fetchFileAndTitle( $title, $options )[0];
3683         }
3684
3685         /**
3686          * Fetch a file and its title and register a reference to it.
3687          * If 'broken' is a key in $options then the file will appear as a broken thumbnail.
3688          * @param Title $title
3689          * @param array $options Array of options to RepoGroup::findFile
3690          * @return array ( File or false, Title of file )
3691          */
3692         public function fetchFileAndTitle( $title, $options = [] ) {
3693                 $file = $this->fetchFileNoRegister( $title, $options );
3694
3695                 $time = $file ? $file->getTimestamp() : false;
3696                 $sha1 = $file ? $file->getSha1() : false;
3697                 # Register the file as a dependency...
3698                 $this->mOutput->addImage( $title->getDBkey(), $time, $sha1 );
3699                 if ( $file && !$title->equals( $file->getTitle() ) ) {
3700                         # Update fetched file title
3701                         $title = $file->getTitle();
3702                         $this->mOutput->addImage( $title->getDBkey(), $time, $sha1 );
3703                 }
3704                 return [ $file, $title ];
3705         }
3706
3707         /**
3708          * Helper function for fetchFileAndTitle.
3709          *
3710          * Also useful if you need to fetch a file but not use it yet,
3711          * for example to get the file's handler.
3712          *
3713          * @param Title $title
3714          * @param array $options Array of options to RepoGroup::findFile
3715          * @return File|bool
3716          */
3717         protected function fetchFileNoRegister( $title, $options = [] ) {
3718                 if ( isset( $options['broken'] ) ) {
3719                         $file = false; // broken thumbnail forced by hook
3720                 } elseif ( isset( $options['sha1'] ) ) { // get by (sha1,timestamp)
3721                         $file = RepoGroup::singleton()->findFileFromKey( $options['sha1'], $options );
3722                 } else { // get by (name,timestamp)
3723                         $file = wfFindFile( $title, $options );
3724                 }
3725                 return $file;
3726         }
3727
3728         /**
3729          * Transclude an interwiki link.
3730          *
3731          * @param Title $title
3732          * @param string $action
3733          *
3734          * @return string
3735          */
3736         public function interwikiTransclude( $title, $action ) {
3737                 global $wgEnableScaryTranscluding;
3738
3739                 if ( !$wgEnableScaryTranscluding ) {
3740                         return wfMessage( 'scarytranscludedisabled' )->inContentLanguage()->text();
3741                 }
3742
3743                 $url = $title->getFullURL( [ 'action' => $action ] );
3744
3745                 if ( strlen( $url ) > 255 ) {
3746                         return wfMessage( 'scarytranscludetoolong' )->inContentLanguage()->text();
3747                 }
3748                 return $this->fetchScaryTemplateMaybeFromCache( $url );
3749         }
3750
3751         /**
3752          * @param string $url
3753          * @return mixed|string
3754          */
3755         public function fetchScaryTemplateMaybeFromCache( $url ) {
3756                 global $wgTranscludeCacheExpiry;
3757                 $dbr = wfGetDB( DB_REPLICA );
3758                 $tsCond = $dbr->timestamp( time() - $wgTranscludeCacheExpiry );
3759                 $obj = $dbr->selectRow( 'transcache', [ 'tc_time', 'tc_contents' ],
3760                                 [ 'tc_url' => $url, "tc_time >= " . $dbr->addQuotes( $tsCond ) ] );
3761                 if ( $obj ) {
3762                         return $obj->tc_contents;
3763                 }
3764
3765                 $req = MWHttpRequest::factory( $url, [], __METHOD__ );
3766                 $status = $req->execute(); // Status object
3767                 if ( $status->isOK() ) {
3768                         $text = $req->getContent();
3769                 } elseif ( $req->getStatus() != 200 ) {
3770                         // Though we failed to fetch the content, this status is useless.
3771                         return wfMessage( 'scarytranscludefailed-httpstatus' )
3772                                 ->params( $url, $req->getStatus() /* HTTP status */ )->inContentLanguage()->text();
3773                 } else {
3774                         return wfMessage( 'scarytranscludefailed', $url )->inContentLanguage()->text();
3775                 }
3776
3777                 $dbw = wfGetDB( DB_MASTER );
3778                 $dbw->replace( 'transcache', [ 'tc_url' ], [
3779                         'tc_url' => $url,
3780                         'tc_time' => $dbw->timestamp( time() ),
3781                         'tc_contents' => $text
3782                 ] );
3783                 return $text;
3784         }
3785
3786         /**
3787          * Triple brace replacement -- used for template arguments
3788          * @private
3789          *
3790          * @param array $piece
3791          * @param PPFrame $frame
3792          *
3793          * @return array
3794          */
3795         public function argSubstitution( $piece, $frame ) {
3796                 $error = false;
3797                 $parts = $piece['parts'];
3798                 $nameWithSpaces = $frame->expand( $piece['title'] );
3799                 $argName = trim( $nameWithSpaces );
3800                 $object = false;
3801                 $text = $frame->getArgument( $argName );
3802                 if ( $text === false && $parts->getLength() > 0
3803                         && ( $this->ot['html']
3804                                 || $this->ot['pre']
3805                                 || ( $this->ot['wiki'] && $frame->isTemplate() )
3806                         )
3807                 ) {
3808                         # No match in frame, use the supplied default
3809                         $object = $parts->item( 0 )->getChildren();
3810                 }
3811                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3812                         $error = '<!-- WARNING: argument omitted, expansion size too large -->';
3813                         $this->limitationWarn( 'post-expand-template-argument' );
3814                 }
3815
3816                 if ( $text === false && $object === false ) {
3817                         # No match anywhere
3818                         $object = $frame->virtualBracketedImplode( '{{{', '|', '}}}', $nameWithSpaces, $parts );
3819                 }
3820                 if ( $error !== false ) {
3821                         $text .= $error;
3822                 }
3823                 if ( $object !== false ) {
3824                         $ret = [ 'object' => $object ];
3825                 } else {
3826                         $ret = [ 'text' => $text ];
3827                 }
3828
3829                 return $ret;
3830         }
3831
3832         /**
3833          * Return the text to be used for a given extension tag.
3834          * This is the ghost of strip().
3835          *
3836          * @param array $params Associative array of parameters:
3837          *     name       PPNode for the tag name
3838          *     attr       PPNode for unparsed text where tag attributes are thought to be
3839          *     attributes Optional associative array of parsed attributes
3840          *     inner      Contents of extension element
3841          *     noClose    Original text did not have a close tag
3842          * @param PPFrame $frame
3843          *
3844          * @throws MWException
3845          * @return string
3846          */
3847         public function extensionSubstitution( $params, $frame ) {
3848                 static $errorStr = '<span class="error">';
3849                 static $errorLen = 20;
3850
3851                 $name = $frame->expand( $params['name'] );
3852                 if ( substr( $name, 0, $errorLen ) === $errorStr ) {
3853                         // Probably expansion depth or node count exceeded. Just punt the
3854                         // error up.
3855                         return $name;
3856                 }
3857
3858                 $attrText = !isset( $params['attr'] ) ? null : $frame->expand( $params['attr'] );
3859                 if ( substr( $attrText, 0, $errorLen ) === $errorStr ) {
3860                         // See above
3861                         return $attrText;
3862                 }
3863
3864                 // We can't safely check if the expansion for $content resulted in an
3865                 // error, because the content could happen to be the error string
3866                 // (T149622).
3867                 $content = !isset( $params['inner'] ) ? null : $frame->expand( $params['inner'] );
3868
3869                 $marker = self::MARKER_PREFIX . "-$name-"
3870                         . sprintf( '%08X', $this->mMarkerIndex++ ) . self::MARKER_SUFFIX;
3871
3872                 $isFunctionTag = isset( $this->mFunctionTagHooks[strtolower( $name )] ) &&
3873                         ( $this->ot['html'] || $this->ot['pre'] );
3874                 if ( $isFunctionTag ) {
3875                         $markerType = 'none';
3876                 } else {
3877                         $markerType = 'general';
3878                 }
3879                 if ( $this->ot['html'] || $isFunctionTag ) {
3880                         $name = strtolower( $name );
3881                         $attributes = Sanitizer::decodeTagAttributes( $attrText );
3882                         if ( isset( $params['attributes'] ) ) {
3883                                 $attributes = $attributes + $params['attributes'];
3884                         }
3885
3886                         if ( isset( $this->mTagHooks[$name] ) ) {
3887                                 $output = call_user_func_array( $this->mTagHooks[$name],
3888                                         [ $content, $attributes, $this, $frame ] );
3889                         } elseif ( isset( $this->mFunctionTagHooks[$name] ) ) {
3890                                 list( $callback, ) = $this->mFunctionTagHooks[$name];
3891
3892                                 // Avoid PHP 7.1 warning from passing $this by reference
3893                                 $parser = $this;
3894                                 $output = call_user_func_array( $callback, [ &$parser, $frame, $content, $attributes ] );
3895                         } else {
3896                                 $output = '<span class="error">Invalid tag extension name: ' .
3897                                         htmlspecialchars( $name ) . '</span>';
3898                         }
3899
3900                         if ( is_array( $output ) ) {
3901                                 // Extract flags
3902                                 $flags = $output;
3903                                 $output = $flags[0];
3904                                 if ( isset( $flags['markerType'] ) ) {
3905                                         $markerType = $flags['markerType'];
3906                                 }
3907                         }
3908                 } else {
3909                         if ( is_null( $attrText ) ) {
3910                                 $attrText = '';
3911                         }
3912                         if ( isset( $params['attributes'] ) ) {
3913                                 foreach ( $params['attributes'] as $attrName => $attrValue ) {
3914                                         $attrText .= ' ' . htmlspecialchars( $attrName ) . '="' .
3915                                                 htmlspecialchars( $attrValue ) . '"';
3916                                 }
3917                         }
3918                         if ( $content === null ) {
3919                                 $output = "<$name$attrText/>";
3920                         } else {
3921                                 $close = is_null( $params['close'] ) ? '' : $frame->expand( $params['close'] );
3922                                 if ( substr( $close, 0, $errorLen ) === $errorStr ) {
3923                                         // See above
3924                                         return $close;
3925                                 }
3926                                 $output = "<$name$attrText>$content$close";
3927                         }
3928                 }
3929
3930                 if ( $markerType === 'none' ) {
3931                         return $output;
3932                 } elseif ( $markerType === 'nowiki' ) {
3933                         $this->mStripState->addNoWiki( $marker, $output );
3934                 } elseif ( $markerType === 'general' ) {
3935                         $this->mStripState->addGeneral( $marker, $output );
3936                 } else {
3937                         throw new MWException( __METHOD__ . ': invalid marker type' );
3938                 }
3939                 return $marker;
3940         }
3941
3942         /**
3943          * Increment an include size counter
3944          *
3945          * @param string $type The type of expansion
3946          * @param int $size The size of the text
3947          * @return bool False if this inclusion would take it over the maximum, true otherwise
3948          */
3949         public function incrementIncludeSize( $type, $size ) {
3950                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize() ) {
3951                         return false;
3952                 } else {
3953                         $this->mIncludeSizes[$type] += $size;
3954                         return true;
3955                 }
3956         }
3957
3958         /**
3959          * Increment the expensive function count
3960          *
3961          * @return bool False if the limit has been exceeded
3962          */
3963         public function incrementExpensiveFunctionCount() {
3964                 $this->mExpensiveFunctionCount++;
3965                 return $this->mExpensiveFunctionCount <= $this->mOptions->getExpensiveParserFunctionLimit();
3966         }
3967
3968         /**
3969          * Strip double-underscore items like __NOGALLERY__ and __NOTOC__
3970          * Fills $this->mDoubleUnderscores, returns the modified text
3971          *
3972          * @param string $text
3973          *
3974          * @return string
3975          */
3976         public function doDoubleUnderscore( $text ) {
3977                 # The position of __TOC__ needs to be recorded
3978                 $mw = MagicWord::get( 'toc' );
3979                 if ( $mw->match( $text ) ) {
3980                         $this->mShowToc = true;
3981                         $this->mForceTocPosition = true;
3982
3983                         # Set a placeholder. At the end we'll fill it in with the TOC.
3984                         $text = $mw->replace( '<!--MWTOC\'"-->', $text, 1 );
3985
3986                         # Only keep the first one.
3987                         $text = $mw->replace( '', $text );
3988                 }
3989
3990                 # Now match and remove the rest of them
3991                 $mwa = MagicWord::getDoubleUnderscoreArray();
3992                 $this->mDoubleUnderscores = $mwa->matchAndRemove( $text );
3993
3994                 if ( isset( $this->mDoubleUnderscores['nogallery'] ) ) {
3995                         $this->mOutput->mNoGallery = true;
3996                 }
3997                 if ( isset( $this->mDoubleUnderscores['notoc'] ) && !$this->mForceTocPosition ) {
3998                         $this->mShowToc = false;
3999                 }
4000                 if ( isset( $this->mDoubleUnderscores['hiddencat'] )
4001                         && $this->mTitle->getNamespace() == NS_CATEGORY
4002                 ) {
4003                         $this->addTrackingCategory( 'hidden-category-category' );
4004                 }
4005                 # (T10068) Allow control over whether robots index a page.
4006                 # __INDEX__ always overrides __NOINDEX__, see T16899
4007                 if ( isset( $this->mDoubleUnderscores['noindex'] ) && $this->mTitle->canUseNoindex() ) {
4008                         $this->mOutput->setIndexPolicy( 'noindex' );
4009                         $this->addTrackingCategory( 'noindex-category' );
4010                 }
4011                 if ( isset( $this->mDoubleUnderscores['index'] ) && $this->mTitle->canUseNoindex() ) {
4012                         $this->mOutput->setIndexPolicy( 'index' );
4013                         $this->addTrackingCategory( 'index-category' );
4014                 }
4015
4016                 # Cache all double underscores in the database
4017                 foreach ( $this->mDoubleUnderscores as $key => $val ) {
4018                         $this->mOutput->setProperty( $key, '' );
4019                 }
4020
4021                 return $text;
4022         }
4023
4024         /**
4025          * @see ParserOutput::addTrackingCategory()
4026          * @param string $msg Message key
4027          * @return bool Whether the addition was successful
4028          */
4029         public function addTrackingCategory( $msg ) {
4030                 return $this->mOutput->addTrackingCategory( $msg, $this->mTitle );
4031         }
4032
4033         /**
4034          * This function accomplishes several tasks:
4035          * 1) Auto-number headings if that option is enabled
4036          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
4037          * 3) Add a Table of contents on the top for users who have enabled the option
4038          * 4) Auto-anchor headings
4039          *
4040          * It loops through all headlines, collects the necessary data, then splits up the
4041          * string and re-inserts the newly formatted headlines.
4042          *
4043          * @param string $text
4044          * @param string $origText Original, untouched wikitext
4045          * @param bool $isMain
4046          * @return mixed|string
4047          * @private
4048          */
4049         public function formatHeadings( $text, $origText, $isMain = true ) {
4050                 global $wgMaxTocLevel;
4051
4052                 # Inhibit editsection links if requested in the page
4053                 if ( isset( $this->mDoubleUnderscores['noeditsection'] ) ) {
4054                         $maybeShowEditLink = false;
4055                 } else {
4056                         $maybeShowEditLink = true; /* Actual presence will depend on post-cache transforms */
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                 # NOTE: white space in headings have been trimmed in doHeadings. They shouldn't
4062                 # be trimmed here since whitespace in HTML headings is significant.
4063                 $matches = [];
4064                 $numMatches = preg_match_all(
4065                         '/<H(?P<level>[1-6])(?P<attrib>.*?>)(?P<header>[\s\S]*?)<\/H[1-6] *>/i',
4066                         $text,
4067                         $matches
4068                 );
4069
4070                 # if there are fewer than 4 headlines in the article, do not show TOC
4071                 # unless it's been explicitly enabled.
4072                 $enoughToc = $this->mShowToc &&
4073                         ( ( $numMatches >= 4 ) || $this->mForceTocPosition );
4074
4075                 # Allow user to stipulate that a page should have a "new section"
4076                 # link added via __NEWSECTIONLINK__
4077                 if ( isset( $this->mDoubleUnderscores['newsectionlink'] ) ) {
4078                         $this->mOutput->setNewSection( true );
4079                 }
4080
4081                 # Allow user to remove the "new section"
4082                 # link via __NONEWSECTIONLINK__
4083                 if ( isset( $this->mDoubleUnderscores['nonewsectionlink'] ) ) {
4084                         $this->mOutput->hideNewSection( true );
4085                 }
4086
4087                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
4088                 # override above conditions and always show TOC above first header
4089                 if ( isset( $this->mDoubleUnderscores['forcetoc'] ) ) {
4090                         $this->mShowToc = true;
4091                         $enoughToc = true;
4092                 }
4093
4094                 # headline counter
4095                 $headlineCount = 0;
4096                 $numVisible = 0;
4097
4098                 # Ugh .. the TOC should have neat indentation levels which can be
4099                 # passed to the skin functions. These are determined here
4100                 $toc = '';
4101                 $full = '';
4102                 $head = [];
4103                 $sublevelCount = [];
4104                 $levelCount = [];
4105                 $level = 0;
4106                 $prevlevel = 0;
4107                 $toclevel = 0;
4108                 $prevtoclevel = 0;
4109                 $markerRegex = self::MARKER_PREFIX . "-h-(\d+)-" . self::MARKER_SUFFIX;
4110                 $baseTitleText = $this->mTitle->getPrefixedDBkey();
4111                 $oldType = $this->mOutputType;
4112                 $this->setOutputType( self::OT_WIKI );
4113                 $frame = $this->getPreprocessor()->newFrame();
4114                 $root = $this->preprocessToDom( $origText );
4115                 $node = $root->getFirstChild();
4116                 $byteOffset = 0;
4117                 $tocraw = [];
4118                 $refers = [];
4119
4120                 $headlines = $numMatches !== false ? $matches[3] : [];
4121
4122                 foreach ( $headlines as $headline ) {
4123                         $isTemplate = false;
4124                         $titleText = false;
4125                         $sectionIndex = false;
4126                         $numbering = '';
4127                         $markerMatches = [];
4128                         if ( preg_match( "/^$markerRegex/", $headline, $markerMatches ) ) {
4129                                 $serial = $markerMatches[1];
4130                                 list( $titleText, $sectionIndex ) = $this->mHeadings[$serial];
4131                                 $isTemplate = ( $titleText != $baseTitleText );
4132                                 $headline = preg_replace( "/^$markerRegex\\s*/", "", $headline );
4133                         }
4134
4135                         if ( $toclevel ) {
4136                                 $prevlevel = $level;
4137                         }
4138                         $level = $matches[1][$headlineCount];
4139
4140                         if ( $level > $prevlevel ) {
4141                                 # Increase TOC level
4142                                 $toclevel++;
4143                                 $sublevelCount[$toclevel] = 0;
4144                                 if ( $toclevel < $wgMaxTocLevel ) {
4145                                         $prevtoclevel = $toclevel;
4146                                         $toc .= Linker::tocIndent();
4147                                         $numVisible++;
4148                                 }
4149                         } elseif ( $level < $prevlevel && $toclevel > 1 ) {
4150                                 # Decrease TOC level, find level to jump to
4151
4152                                 for ( $i = $toclevel; $i > 0; $i-- ) {
4153                                         if ( $levelCount[$i] == $level ) {
4154                                                 # Found last matching level
4155                                                 $toclevel = $i;
4156                                                 break;
4157                                         } elseif ( $levelCount[$i] < $level ) {
4158                                                 # Found first matching level below current level
4159                                                 $toclevel = $i + 1;
4160                                                 break;
4161                                         }
4162                                 }
4163                                 if ( $i == 0 ) {
4164                                         $toclevel = 1;
4165                                 }
4166                                 if ( $toclevel < $wgMaxTocLevel ) {
4167                                         if ( $prevtoclevel < $wgMaxTocLevel ) {
4168                                                 # Unindent only if the previous toc level was shown :p
4169                                                 $toc .= Linker::tocUnindent( $prevtoclevel - $toclevel );
4170                                                 $prevtoclevel = $toclevel;
4171                                         } else {
4172                                                 $toc .= Linker::tocLineEnd();
4173                                         }
4174                                 }
4175                         } else {
4176                                 # No change in level, end TOC line
4177                                 if ( $toclevel < $wgMaxTocLevel ) {
4178                                         $toc .= Linker::tocLineEnd();
4179                                 }
4180                         }
4181
4182                         $levelCount[$toclevel] = $level;
4183
4184                         # count number of headlines for each level
4185                         $sublevelCount[$toclevel]++;
4186                         $dot = 0;
4187                         for ( $i = 1; $i <= $toclevel; $i++ ) {
4188                                 if ( !empty( $sublevelCount[$i] ) ) {
4189                                         if ( $dot ) {
4190                                                 $numbering .= '.';
4191                                         }
4192                                         $numbering .= $this->getTargetLanguage()->formatNum( $sublevelCount[$i] );
4193                                         $dot = 1;
4194                                 }
4195                         }
4196
4197                         # The safe header is a version of the header text safe to use for links
4198
4199                         # Remove link placeholders by the link text.
4200                         #     <!--LINK number-->
4201                         # turns into
4202                         #     link text with suffix
4203                         # Do this before unstrip since link text can contain strip markers
4204                         $safeHeadline = $this->replaceLinkHoldersText( $headline );
4205
4206                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
4207                         $safeHeadline = $this->mStripState->unstripBoth( $safeHeadline );
4208
4209                         # Strip out HTML (first regex removes any tag not allowed)
4210                         # Allowed tags are:
4211                         # * <sup> and <sub> (T10393)
4212                         # * <i> (T28375)
4213                         # * <b> (r105284)
4214                         # * <bdi> (T74884)
4215                         # * <span dir="rtl"> and <span dir="ltr"> (T37167)
4216                         # * <s> and <strike> (T35715)
4217                         # We strip any parameter from accepted tags (second regex), except dir="rtl|ltr" from <span>,
4218                         # to allow setting directionality in toc items.
4219                         $tocline = preg_replace(
4220                                 [
4221                                         '#<(?!/?(span|sup|sub|bdi|i|b|s|strike)(?: [^>]*)?>).*?>#',
4222                                         '#<(/?(?:span(?: dir="(?:rtl|ltr)")?|sup|sub|bdi|i|b|s|strike))(?: .*?)?>#'
4223                                 ],
4224                                 [ '', '<$1>' ],
4225                                 $safeHeadline
4226                         );
4227
4228                         # Strip '<span></span>', which is the result from the above if
4229                         # <span id="foo"></span> is used to produce an additional anchor
4230                         # for a section.
4231                         $tocline = str_replace( '<span></span>', '', $tocline );
4232
4233                         $tocline = trim( $tocline );
4234
4235                         # For the anchor, strip out HTML-y stuff period
4236                         $safeHeadline = preg_replace( '/<.*?>/', '', $safeHeadline );
4237                         $safeHeadline = Sanitizer::normalizeSectionNameWhitespace( $safeHeadline );
4238
4239                         # Save headline for section edit hint before it's escaped
4240                         $headlineHint = $safeHeadline;
4241
4242                         # Decode HTML entities
4243                         $safeHeadline = Sanitizer::decodeCharReferences( $safeHeadline );
4244
4245                         $safeHeadline = self::normalizeSectionName( $safeHeadline );
4246
4247                         $fallbackHeadline = Sanitizer::escapeIdForAttribute( $safeHeadline, Sanitizer::ID_FALLBACK );
4248                         $linkAnchor = Sanitizer::escapeIdForLink( $safeHeadline );
4249                         $safeHeadline = Sanitizer::escapeIdForAttribute( $safeHeadline, Sanitizer::ID_PRIMARY );
4250                         if ( $fallbackHeadline === $safeHeadline ) {
4251                                 # No reason to have both (in fact, we can't)
4252                                 $fallbackHeadline = false;
4253                         }
4254
4255                         # HTML IDs must be case-insensitively unique for IE compatibility (T12721).
4256                         # @todo FIXME: We may be changing them depending on the current locale.
4257                         $arrayKey = strtolower( $safeHeadline );
4258                         if ( $fallbackHeadline === false ) {
4259                                 $fallbackArrayKey = false;
4260                         } else {
4261                                 $fallbackArrayKey = strtolower( $fallbackHeadline );
4262                         }
4263
4264                         # Create the anchor for linking from the TOC to the section
4265                         $anchor = $safeHeadline;
4266                         $fallbackAnchor = $fallbackHeadline;
4267                         if ( isset( $refers[$arrayKey] ) ) {
4268                                 // phpcs:ignore Generic.CodeAnalysis.ForLoopWithTestFunctionCall,Generic.Formatting.DisallowMultipleStatements
4269                                 for ( $i = 2; isset( $refers["${arrayKey}_$i"] ); ++$i );
4270                                 $anchor .= "_$i";
4271                                 $linkAnchor .= "_$i";
4272                                 $refers["${arrayKey}_$i"] = true;
4273                         } else {
4274                                 $refers[$arrayKey] = true;
4275                         }
4276                         if ( $fallbackHeadline !== false && isset( $refers[$fallbackArrayKey] ) ) {
4277                                 // phpcs:ignore Generic.CodeAnalysis.ForLoopWithTestFunctionCall,Generic.Formatting.DisallowMultipleStatements
4278                                 for ( $i = 2; isset( $refers["${fallbackArrayKey}_$i"] ); ++$i );
4279                                 $fallbackAnchor .= "_$i";
4280                                 $refers["${fallbackArrayKey}_$i"] = true;
4281                         } else {
4282                                 $refers[$fallbackArrayKey] = true;
4283                         }
4284
4285                         # Don't number the heading if it is the only one (looks silly)
4286                         if ( count( $matches[3] ) > 1 && $this->mOptions->getNumberHeadings() ) {
4287                                 # the two are different if the line contains a link
4288                                 $headline = Html::element(
4289                                         'span',
4290                                         [ 'class' => 'mw-headline-number' ],
4291                                         $numbering
4292                                 ) . ' ' . $headline;
4293                         }
4294
4295                         if ( $enoughToc && ( !isset( $wgMaxTocLevel ) || $toclevel < $wgMaxTocLevel ) ) {
4296                                 $toc .= Linker::tocLine( $linkAnchor, $tocline,
4297                                         $numbering, $toclevel, ( $isTemplate ? false : $sectionIndex ) );
4298                         }
4299
4300                         # Add the section to the section tree
4301                         # Find the DOM node for this header
4302                         $noOffset = ( $isTemplate || $sectionIndex === false );
4303                         while ( $node && !$noOffset ) {
4304                                 if ( $node->getName() === 'h' ) {
4305                                         $bits = $node->splitHeading();
4306                                         if ( $bits['i'] == $sectionIndex ) {
4307                                                 break;
4308                                         }
4309                                 }
4310                                 $byteOffset += mb_strlen( $this->mStripState->unstripBoth(
4311                                         $frame->expand( $node, PPFrame::RECOVER_ORIG ) ) );
4312                                 $node = $node->getNextSibling();
4313                         }
4314                         $tocraw[] = [
4315                                 'toclevel' => $toclevel,
4316                                 'level' => $level,
4317                                 'line' => $tocline,
4318                                 'number' => $numbering,
4319                                 'index' => ( $isTemplate ? 'T-' : '' ) . $sectionIndex,
4320                                 'fromtitle' => $titleText,
4321                                 'byteoffset' => ( $noOffset ? null : $byteOffset ),
4322                                 'anchor' => $anchor,
4323                         ];
4324
4325                         # give headline the correct <h#> tag
4326                         if ( $maybeShowEditLink && $sectionIndex !== false ) {
4327                                 // Output edit section links as markers with styles that can be customized by skins
4328                                 if ( $isTemplate ) {
4329                                         # Put a T flag in the section identifier, to indicate to extractSections()
4330                                         # that sections inside <includeonly> should be counted.
4331                                         $editsectionPage = $titleText;
4332                                         $editsectionSection = "T-$sectionIndex";
4333                                         $editsectionContent = null;
4334                                 } else {
4335                                         $editsectionPage = $this->mTitle->getPrefixedText();
4336                                         $editsectionSection = $sectionIndex;
4337                                         $editsectionContent = $headlineHint;
4338                                 }
4339                                 // We use a bit of pesudo-xml for editsection markers. The
4340                                 // language converter is run later on. Using a UNIQ style marker
4341                                 // leads to the converter screwing up the tokens when it
4342                                 // converts stuff. And trying to insert strip tags fails too. At
4343                                 // this point all real inputted tags have already been escaped,
4344                                 // so we don't have to worry about a user trying to input one of
4345                                 // these markers directly. We use a page and section attribute
4346                                 // to stop the language converter from converting these
4347                                 // important bits of data, but put the headline hint inside a
4348                                 // content block because the language converter is supposed to
4349                                 // be able to convert that piece of data.
4350                                 // Gets replaced with html in ParserOutput::getText
4351                                 $editlink = '<mw:editsection page="' . htmlspecialchars( $editsectionPage );
4352                                 $editlink .= '" section="' . htmlspecialchars( $editsectionSection ) . '"';
4353                                 if ( $editsectionContent !== null ) {
4354                                         $editlink .= '>' . $editsectionContent . '</mw:editsection>';
4355                                 } else {
4356                                         $editlink .= '/>';
4357                                 }
4358                         } else {
4359                                 $editlink = '';
4360                         }
4361                         $head[$headlineCount] = Linker::makeHeadline( $level,
4362                                 $matches['attrib'][$headlineCount], $anchor, $headline,
4363                                 $editlink, $fallbackAnchor );
4364
4365                         $headlineCount++;
4366                 }
4367
4368                 $this->setOutputType( $oldType );
4369
4370                 # Never ever show TOC if no headers
4371                 if ( $numVisible < 1 ) {
4372                         $enoughToc = false;
4373                 }
4374
4375                 if ( $enoughToc ) {
4376                         if ( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
4377                                 $toc .= Linker::tocUnindent( $prevtoclevel - 1 );
4378                         }
4379                         $toc = Linker::tocList( $toc, $this->mOptions->getUserLangObj() );
4380                         $this->mOutput->setTOCHTML( $toc );
4381                         $toc = self::TOC_START . $toc . self::TOC_END;
4382                 }
4383
4384                 if ( $isMain ) {
4385                         $this->mOutput->setSections( $tocraw );
4386                 }
4387
4388                 # split up and insert constructed headlines
4389                 $blocks = preg_split( '/<H[1-6].*?>[\s\S]*?<\/H[1-6]>/i', $text );
4390                 $i = 0;
4391
4392                 // build an array of document sections
4393                 $sections = [];
4394                 foreach ( $blocks as $block ) {
4395                         // $head is zero-based, sections aren't.
4396                         if ( empty( $head[$i - 1] ) ) {
4397                                 $sections[$i] = $block;
4398                         } else {
4399                                 $sections[$i] = $head[$i - 1] . $block;
4400                         }
4401
4402                         /**
4403                          * Send a hook, one per section.
4404                          * The idea here is to be able to make section-level DIVs, but to do so in a
4405                          * lower-impact, more correct way than r50769
4406                          *
4407                          * $this : caller
4408                          * $section : the section number
4409                          * &$sectionContent : ref to the content of the section
4410                          * $maybeShowEditLinks : boolean describing whether this section has an edit link
4411                          */
4412                         Hooks::run( 'ParserSectionCreate', [ $this, $i, &$sections[$i], $maybeShowEditLink ] );
4413
4414                         $i++;
4415                 }
4416
4417                 if ( $enoughToc && $isMain && !$this->mForceTocPosition ) {
4418                         // append the TOC at the beginning
4419                         // Top anchor now in skin
4420                         $sections[0] = $sections[0] . $toc . "\n";
4421                 }
4422
4423                 $full .= implode( '', $sections );
4424
4425                 if ( $this->mForceTocPosition ) {
4426                         return str_replace( '<!--MWTOC\'"-->', $toc, $full );
4427                 } else {
4428                         return $full;
4429                 }
4430         }
4431
4432         /**
4433          * Transform wiki markup when saving a page by doing "\r\n" -> "\n"
4434          * conversion, substituting signatures, {{subst:}} templates, etc.
4435          *
4436          * @param string $text The text to transform
4437          * @param Title $title The Title object for the current article
4438          * @param User $user The User object describing the current user
4439          * @param ParserOptions $options Parsing options
4440          * @param bool $clearState Whether to clear the parser state first
4441          * @return string The altered wiki markup
4442          */
4443         public function preSaveTransform( $text, Title $title, User $user,
4444                 ParserOptions $options, $clearState = true
4445         ) {
4446                 if ( $clearState ) {
4447                         $magicScopeVariable = $this->lock();
4448                 }
4449                 $this->startParse( $title, $options, self::OT_WIKI, $clearState );
4450                 $this->setUser( $user );
4451
4452                 // Strip U+0000 NULL (T159174)
4453                 $text = str_replace( "\000", '', $text );
4454
4455                 // We still normalize line endings for backwards-compatibility
4456                 // with other code that just calls PST, but this should already
4457                 // be handled in TextContent subclasses
4458                 $text = TextContent::normalizeLineEndings( $text );
4459
4460                 if ( $options->getPreSaveTransform() ) {
4461                         $text = $this->pstPass2( $text, $user );
4462                 }
4463                 $text = $this->mStripState->unstripBoth( $text );
4464
4465                 $this->setUser( null ); # Reset
4466
4467                 return $text;
4468         }
4469
4470         /**
4471          * Pre-save transform helper function
4472          *
4473          * @param string $text
4474          * @param User $user
4475          *
4476          * @return string
4477          */
4478         private function pstPass2( $text, $user ) {
4479                 global $wgContLang;
4480
4481                 # Note: This is the timestamp saved as hardcoded wikitext to
4482                 # the database, we use $wgContLang here in order to give
4483                 # everyone the same signature and use the default one rather
4484                 # than the one selected in each user's preferences.
4485                 # (see also T14815)
4486                 $ts = $this->mOptions->getTimestamp();
4487                 $timestamp = MWTimestamp::getLocalInstance( $ts );
4488                 $ts = $timestamp->format( 'YmdHis' );
4489                 $tzMsg = $timestamp->getTimezoneMessage()->inContentLanguage()->text();
4490
4491                 $d = $wgContLang->timeanddate( $ts, false, false ) . " ($tzMsg)";
4492
4493                 # Variable replacement
4494                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
4495                 $text = $this->replaceVariables( $text );
4496
4497                 # This works almost by chance, as the replaceVariables are done before the getUserSig(),
4498                 # which may corrupt this parser instance via its wfMessage()->text() call-
4499
4500                 # Signatures
4501                 if ( strpos( $text, '~~~' ) !== false ) {
4502                         $sigText = $this->getUserSig( $user );
4503                         $text = strtr( $text, [
4504                                 '~~~~~' => $d,
4505                                 '~~~~' => "$sigText $d",
4506                                 '~~~' => $sigText
4507                         ] );
4508                         # The main two signature forms used above are time-sensitive
4509                         $this->mOutput->setFlag( 'user-signature' );
4510                 }
4511
4512                 # Context links ("pipe tricks"): [[|name]] and [[name (context)|]]
4513                 $tc = '[' . Title::legalChars() . ']';
4514                 $nc = '[ _0-9A-Za-z\x80-\xff-]'; # Namespaces can use non-ascii!
4515
4516                 // [[ns:page (context)|]]
4517                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( ?\\($tc+\\))\\|]]/";
4518                 // [[ns:page（context）|]] (double-width brackets, added in r40257)
4519                 $p4 = "/\[\[(:?$nc+:|:|)($tc+?)( ?（$tc+）)\\|]]/";
4520                 // [[ns:page (context), context|]] (using either single or double-width comma)
4521                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( ?\\($tc+\\)|)((?:, |，)$tc+|)\\|]]/";
4522                 // [[|page]] (reverse pipe trick: add context from page title)
4523                 $p2 = "/\[\[\\|($tc+)]]/";
4524
4525                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
4526                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
4527                 $text = preg_replace( $p4, '[[\\1\\2\\3|\\2]]', $text );
4528                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
4529
4530                 $t = $this->mTitle->getText();
4531                 $m = [];
4532                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
4533                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4534                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && "$m[1]$m[2]" != '' ) {
4535                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4536                 } else {
4537                         # if there's no context, don't bother duplicating the title
4538                         $text = preg_replace( $p2, '[[\\1]]', $text );
4539                 }
4540
4541                 return $text;
4542         }
4543
4544         /**
4545          * Fetch the user's signature text, if any, and normalize to
4546          * validated, ready-to-insert wikitext.
4547          * If you have pre-fetched the nickname or the fancySig option, you can
4548          * specify them here to save a database query.
4549          * Do not reuse this parser instance after calling getUserSig(),
4550          * as it may have changed if it's the $wgParser.
4551          *
4552          * @param User &$user
4553          * @param string|bool $nickname Nickname to use or false to use user's default nickname
4554          * @param bool|null $fancySig whether the nicknname is the complete signature
4555          *    or null to use default value
4556          * @return string
4557          */
4558         public function getUserSig( &$user, $nickname = false, $fancySig = null ) {
4559                 global $wgMaxSigChars;
4560
4561                 $username = $user->getName();
4562
4563                 # If not given, retrieve from the user object.
4564                 if ( $nickname === false ) {
4565                         $nickname = $user->getOption( 'nickname' );
4566                 }
4567
4568                 if ( is_null( $fancySig ) ) {
4569                         $fancySig = $user->getBoolOption( 'fancysig' );
4570                 }
4571
4572                 $nickname = $nickname == null ? $username : $nickname;
4573
4574                 if ( mb_strlen( $nickname ) > $wgMaxSigChars ) {
4575                         $nickname = $username;
4576                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
4577                 } elseif ( $fancySig !== false ) {
4578                         # Sig. might contain markup; validate this
4579                         if ( $this->validateSig( $nickname ) !== false ) {
4580                                 # Validated; clean up (if needed) and return it
4581                                 return $this->cleanSig( $nickname, true );
4582                         } else {
4583                                 # Failed to validate; fall back to the default
4584                                 $nickname = $username;
4585                                 wfDebug( __METHOD__ . ": $username has bad XML tags in signature.\n" );
4586                         }
4587                 }
4588
4589                 # Make sure nickname doesnt get a sig in a sig
4590                 $nickname = self::cleanSigInSig( $nickname );
4591
4592                 # If we're still here, make it a link to the user page
4593                 $userText = wfEscapeWikiText( $username );
4594                 $nickText = wfEscapeWikiText( $nickname );
4595                 $msgName = $user->isAnon() ? 'signature-anon' : 'signature';
4596
4597                 return wfMessage( $msgName, $userText, $nickText )->inContentLanguage()
4598                         ->title( $this->getTitle() )->text();
4599         }
4600
4601         /**
4602          * Check that the user's signature contains no bad XML
4603          *
4604          * @param string $text
4605          * @return string|bool An expanded string, or false if invalid.
4606          */
4607         public function validateSig( $text ) {
4608                 return Xml::isWellFormedXmlFragment( $text ) ? $text : false;
4609         }
4610
4611         /**
4612          * Clean up signature text
4613          *
4614          * 1) Strip 3, 4 or 5 tildes out of signatures @see cleanSigInSig
4615          * 2) Substitute all transclusions
4616          *
4617          * @param string $text
4618          * @param bool $parsing Whether we're cleaning (preferences save) or parsing
4619          * @return string Signature text
4620          */
4621         public function cleanSig( $text, $parsing = false ) {
4622                 if ( !$parsing ) {
4623                         global $wgTitle;
4624                         $magicScopeVariable = $this->lock();
4625                         $this->startParse( $wgTitle, new ParserOptions, self::OT_PREPROCESS, true );
4626                 }
4627
4628                 # Option to disable this feature
4629                 if ( !$this->mOptions->getCleanSignatures() ) {
4630                         return $text;
4631                 }
4632
4633                 # @todo FIXME: Regex doesn't respect extension tags or nowiki
4634                 #  => Move this logic to braceSubstitution()
4635                 $substWord = MagicWord::get( 'subst' );
4636                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
4637                 $substText = '{{' . $substWord->getSynonym( 0 );
4638
4639                 $text = preg_replace( $substRegex, $substText, $text );
4640                 $text = self::cleanSigInSig( $text );
4641                 $dom = $this->preprocessToDom( $text );
4642                 $frame = $this->getPreprocessor()->newFrame();
4643                 $text = $frame->expand( $dom );
4644
4645                 if ( !$parsing ) {
4646                         $text = $this->mStripState->unstripBoth( $text );
4647                 }
4648
4649                 return $text;
4650         }
4651
4652         /**
4653          * Strip 3, 4 or 5 tildes out of signatures.
4654          *
4655          * @param string $text
4656          * @return string Signature text with /~{3,5}/ removed
4657          */
4658         public static function cleanSigInSig( $text ) {
4659                 $text = preg_replace( '/~{3,5}/', '', $text );
4660                 return $text;
4661         }
4662
4663         /**
4664          * Set up some variables which are usually set up in parse()
4665          * so that an external function can call some class members with confidence
4666          *
4667          * @param Title|null $title
4668          * @param ParserOptions $options
4669          * @param int $outputType
4670          * @param bool $clearState
4671          */
4672         public function startExternalParse( Title $title = null, ParserOptions $options,
4673                 $outputType, $clearState = true
4674         ) {
4675                 $this->startParse( $title, $options, $outputType, $clearState );
4676         }
4677
4678         /**
4679          * @param Title|null $title
4680          * @param ParserOptions $options
4681          * @param int $outputType
4682          * @param bool $clearState
4683          */
4684         private function startParse( Title $title = null, ParserOptions $options,
4685                 $outputType, $clearState = true
4686         ) {
4687                 $this->setTitle( $title );
4688                 $this->mOptions = $options;
4689                 $this->setOutputType( $outputType );
4690                 if ( $clearState ) {
4691                         $this->clearState();
4692                 }
4693         }
4694
4695         /**
4696          * Wrapper for preprocess()
4697          *
4698          * @param string $text The text to preprocess
4699          * @param ParserOptions $options
4700          * @param Title|null $title Title object or null to use $wgTitle
4701          * @return string
4702          */
4703         public function transformMsg( $text, $options, $title = null ) {
4704                 static $executing = false;
4705
4706                 # Guard against infinite recursion
4707                 if ( $executing ) {
4708                         return $text;
4709                 }
4710                 $executing = true;
4711
4712                 if ( !$title ) {
4713                         global $wgTitle;
4714                         $title = $wgTitle;
4715                 }
4716
4717                 $text = $this->preprocess( $text, $title, $options );
4718
4719                 $executing = false;
4720                 return $text;
4721         }
4722
4723         /**
4724          * Create an HTML-style tag, e.g. "<yourtag>special text</yourtag>"
4725          * The callback should have the following form:
4726          *    function myParserHook( $text, $params, $parser, $frame ) { ... }
4727          *
4728          * Transform and return $text. Use $parser for any required context, e.g. use
4729          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
4730          *
4731          * Hooks may return extended information by returning an array, of which the
4732          * first numbered element (index 0) must be the return string, and all other
4733          * entries are extracted into local variables within an internal function
4734          * in the Parser class.
4735          *
4736          * This interface (introduced r61913) appears to be undocumented, but
4737          * 'markerType' is used by some core tag hooks to override which strip
4738          * array their results are placed in. **Use great caution if attempting
4739          * this interface, as it is not documented and injudicious use could smash
4740          * private variables.**
4741          *
4742          * @param string $tag The tag to use, e.g. 'hook' for "<hook>"
4743          * @param callable $callback The callback function (and object) to use for the tag
4744          * @throws MWException
4745          * @return callable|null The old value of the mTagHooks array associated with the hook
4746          */
4747         public function setHook( $tag, callable $callback ) {
4748                 $tag = strtolower( $tag );
4749                 if ( preg_match( '/[<>\r\n]/', $tag, $m ) ) {
4750                         throw new MWException( "Invalid character {$m[0]} in setHook('$tag', ...) call" );
4751                 }
4752                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
4753                 $this->mTagHooks[$tag] = $callback;
4754                 if ( !in_array( $tag, $this->mStripList ) ) {
4755                         $this->mStripList[] = $tag;
4756                 }
4757
4758                 return $oldVal;
4759         }
4760
4761         /**
4762          * As setHook(), but letting the contents be parsed.
4763          *
4764          * Transparent tag hooks are like regular XML-style tag hooks, except they
4765          * operate late in the transformation sequence, on HTML instead of wikitext.
4766          *
4767          * This is probably obsoleted by things dealing with parser frames?
4768          * The only extension currently using it is geoserver.
4769          *
4770          * @since 1.10
4771          * @todo better document or deprecate this
4772          *
4773          * @param string $tag The tag to use, e.g. 'hook' for "<hook>"
4774          * @param callable $callback The callback function (and object) to use for the tag
4775          * @throws MWException
4776          * @return callable|null The old value of the mTagHooks array associated with the hook
4777          */
4778         public function setTransparentTagHook( $tag, callable $callback ) {
4779                 $tag = strtolower( $tag );
4780                 if ( preg_match( '/[<>\r\n]/', $tag, $m ) ) {
4781                         throw new MWException( "Invalid character {$m[0]} in setTransparentHook('$tag', ...) call" );
4782                 }
4783                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
4784                 $this->mTransparentTagHooks[$tag] = $callback;
4785
4786                 return $oldVal;
4787         }
4788
4789         /**
4790          * Remove all tag hooks
4791          */
4792         public function clearTagHooks() {
4793                 $this->mTagHooks = [];
4794                 $this->mFunctionTagHooks = [];
4795                 $this->mStripList = $this->mDefaultStripList;
4796         }
4797
4798         /**
4799          * Create a function, e.g. {{sum:1|2|3}}
4800          * The callback function should have the form:
4801          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
4802          *
4803          * Or with Parser::SFH_OBJECT_ARGS:
4804          *    function myParserFunction( $parser, $frame, $args ) { ... }
4805          *
4806          * The callback may either return the text result of the function, or an array with the text
4807          * in element 0, and a number of flags in the other elements. The names of the flags are
4808          * specified in the keys. Valid flags are:
4809          *   found                     The text returned is valid, stop processing the template. This
4810          *                             is on by default.
4811          *   nowiki                    Wiki markup in the return value should be escaped
4812          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
4813          *
4814          * @param string $id The magic word ID
4815          * @param callable $callback The callback function (and object) to use
4816          * @param int $flags A combination of the following flags:
4817          *     Parser::SFH_NO_HASH      No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
4818          *
4819          *     Parser::SFH_OBJECT_ARGS  Pass the template arguments as PPNode objects instead of text.
4820          *     This allows for conditional expansion of the parse tree, allowing you to eliminate dead
4821          *     branches and thus speed up parsing. It is also possible to analyse the parse tree of
4822          *     the arguments, and to control the way they are expanded.
4823          *
4824          *     The $frame parameter is a PPFrame. This can be used to produce expanded text from the
4825          *     arguments, for instance:
4826          *         $text = isset( $args[0] ) ? $frame->expand( $args[0] ) : '';
4827          *
4828          *     For technical reasons, $args[0] is pre-expanded and will be a string. This may change in
4829          *     future versions. Please call $frame->expand() on it anyway so that your code keeps
4830          *     working if/when this is changed.
4831          *
4832          *     If you want whitespace to be trimmed from $args, you need to do it yourself, post-
4833          *     expansion.
4834          *
4835          *     Please read the documentation in includes/parser/Preprocessor.php for more information
4836          *     about the methods available in PPFrame and PPNode.
4837          *
4838          * @throws MWException
4839          * @return string|callable The old callback function for this name, if any
4840          */
4841         public function setFunctionHook( $id, callable $callback, $flags = 0 ) {
4842                 global $wgContLang;
4843
4844                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id][0] : null;
4845                 $this->mFunctionHooks[$id] = [ $callback, $flags ];
4846
4847                 # Add to function cache
4848                 $mw = MagicWord::get( $id );
4849                 if ( !$mw ) {
4850                         throw new MWException( __METHOD__ . '() expecting a magic word identifier.' );
4851                 }
4852
4853                 $synonyms = $mw->getSynonyms();
4854                 $sensitive = intval( $mw->isCaseSensitive() );
4855
4856                 foreach ( $synonyms as $syn ) {
4857                         # Case
4858                         if ( !$sensitive ) {
4859                                 $syn = $wgContLang->lc( $syn );
4860                         }
4861                         # Add leading hash
4862                         if ( !( $flags & self::SFH_NO_HASH ) ) {
4863                                 $syn = '#' . $syn;
4864                         }
4865                         # Remove trailing colon
4866                         if ( substr( $syn, -1, 1 ) === ':' ) {
4867                                 $syn = substr( $syn, 0, -1 );
4868                         }
4869                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
4870                 }
4871                 return $oldVal;
4872         }
4873
4874         /**
4875          * Get all registered function hook identifiers
4876          *
4877          * @return array
4878          */
4879         public function getFunctionHooks() {
4880                 return array_keys( $this->mFunctionHooks );
4881         }
4882
4883         /**
4884          * Create a tag function, e.g. "<test>some stuff</test>".
4885          * Unlike tag hooks, tag functions are parsed at preprocessor level.
4886          * Unlike parser functions, their content is not preprocessed.
4887          * @param string $tag
4888          * @param callable $callback
4889          * @param int $flags
4890          * @throws MWException
4891          * @return null
4892          */
4893         public function setFunctionTagHook( $tag, callable $callback, $flags ) {
4894                 $tag = strtolower( $tag );
4895                 if ( preg_match( '/[<>\r\n]/', $tag, $m ) ) {
4896                         throw new MWException( "Invalid character {$m[0]} in setFunctionTagHook('$tag', ...) call" );
4897                 }
4898                 $old = isset( $this->mFunctionTagHooks[$tag] ) ?
4899                         $this->mFunctionTagHooks[$tag] : null;
4900                 $this->mFunctionTagHooks[$tag] = [ $callback, $flags ];
4901
4902                 if ( !in_array( $tag, $this->mStripList ) ) {
4903                         $this->mStripList[] = $tag;
4904                 }
4905
4906                 return $old;
4907         }
4908
4909         /**
4910          * Replace "<!--LINK-->" link placeholders with actual links, in the buffer
4911          * Placeholders created in Linker::link()
4912          *
4913          * @param string &$text
4914          * @param int $options
4915          */
4916         public function replaceLinkHolders( &$text, $options = 0 ) {
4917                 $this->mLinkHolders->replace( $text );
4918         }
4919
4920         /**
4921          * Replace "<!--LINK-->" link placeholders with plain text of links
4922          * (not HTML-formatted).
4923          *
4924          * @param string $text
4925          * @return string
4926          */
4927         public function replaceLinkHoldersText( $text ) {
4928                 return $this->mLinkHolders->replaceText( $text );
4929         }
4930
4931         /**
4932          * Renders an image gallery from a text with one line per image.
4933          * text labels may be given by using |-style alternative text. E.g.
4934          *   Image:one.jpg|The number "1"
4935          *   Image:tree.jpg|A tree
4936          * given as text will return the HTML of a gallery with two images,
4937          * labeled 'The number "1"' and
4938          * 'A tree'.
4939          *
4940          * @param string $text
4941          * @param array $params
4942          * @return string HTML
4943          */
4944         public function renderImageGallery( $text, $params ) {
4945                 $mode = false;
4946                 if ( isset( $params['mode'] ) ) {
4947                         $mode = $params['mode'];
4948                 }
4949
4950                 try {
4951                         $ig = ImageGalleryBase::factory( $mode );
4952                 } catch ( Exception $e ) {
4953                         // If invalid type set, fallback to default.
4954                         $ig = ImageGalleryBase::factory( false );
4955                 }
4956
4957                 $ig->setContextTitle( $this->mTitle );
4958                 $ig->setShowBytes( false );
4959                 $ig->setShowDimensions( false );
4960                 $ig->setShowFilename( false );
4961                 $ig->setParser( $this );
4962                 $ig->setHideBadImages();
4963                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'ul' ) );
4964
4965                 if ( isset( $params['showfilename'] ) ) {
4966                         $ig->setShowFilename( true );
4967                 } else {
4968                         $ig->setShowFilename( false );
4969                 }
4970                 if ( isset( $params['caption'] ) ) {
4971                         $caption = $params['caption'];
4972                         $caption = htmlspecialchars( $caption );
4973                         $caption = $this->replaceInternalLinks( $caption );
4974                         $ig->setCaptionHtml( $caption );
4975                 }
4976                 if ( isset( $params['perrow'] ) ) {
4977                         $ig->setPerRow( $params['perrow'] );
4978                 }
4979                 if ( isset( $params['widths'] ) ) {
4980                         $ig->setWidths( $params['widths'] );
4981                 }
4982                 if ( isset( $params['heights'] ) ) {
4983                         $ig->setHeights( $params['heights'] );
4984                 }
4985                 $ig->setAdditionalOptions( $params );
4986
4987                 // Avoid PHP 7.1 warning from passing $this by reference
4988                 $parser = $this;
4989                 Hooks::run( 'BeforeParserrenderImageGallery', [ &$parser, &$ig ] );
4990
4991                 $lines = StringUtils::explode( "\n", $text );
4992                 foreach ( $lines as $line ) {
4993                         # match lines like these:
4994                         # Image:someimage.jpg|This is some image
4995                         $matches = [];
4996                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4997                         # Skip empty lines
4998                         if ( count( $matches ) == 0 ) {
4999                                 continue;
5000                         }
5001
5002                         if ( strpos( $matches[0], '%' ) !== false ) {
5003                                 $matches[1] = rawurldecode( $matches[1] );
5004                         }
5005                         $title = Title::newFromText( $matches[1], NS_FILE );
5006                         if ( is_null( $title ) ) {
5007                                 # Bogus title. Ignore these so we don't bomb out later.
5008                                 continue;
5009                         }
5010
5011                         # We need to get what handler the file uses, to figure out parameters.
5012                         # Note, a hook can overide the file name, and chose an entirely different
5013                         # file (which potentially could be of a different type and have different handler).
5014                         $options = [];
5015                         $descQuery = false;
5016                         Hooks::run( 'BeforeParserFetchFileAndTitle',
5017                                 [ $this, $title, &$options, &$descQuery ] );
5018                         # Don't register it now, as TraditionalImageGallery does that later.
5019                         $file = $this->fetchFileNoRegister( $title, $options );
5020                         $handler = $file ? $file->getHandler() : false;
5021
5022                         $paramMap = [
5023                                 'img_alt' => 'gallery-internal-alt',
5024                                 'img_link' => 'gallery-internal-link',
5025                         ];
5026                         if ( $handler ) {
5027                                 $paramMap = $paramMap + $handler->getParamMap();
5028                                 // We don't want people to specify per-image widths.
5029                                 // Additionally the width parameter would need special casing anyhow.
5030                                 unset( $paramMap['img_width'] );
5031                         }
5032
5033                         $mwArray = new MagicWordArray( array_keys( $paramMap ) );
5034
5035                         $label = '';
5036                         $alt = '';
5037                         $link = '';
5038                         $handlerOptions = [];
5039                         if ( isset( $matches[3] ) ) {
5040                                 // look for an |alt= definition while trying not to break existing
5041                                 // captions with multiple pipes (|) in it, until a more sensible grammar
5042                                 // is defined for images in galleries
5043
5044                                 // FIXME: Doing recursiveTagParse at this stage, and the trim before
5045                                 // splitting on '|' is a bit odd, and different from makeImage.
5046                                 $matches[3] = $this->recursiveTagParse( trim( $matches[3] ) );
5047                                 // Protect LanguageConverter markup
5048                                 $parameterMatches = StringUtils::delimiterExplode(
5049                                         '-{', '}-', '|', $matches[3], true /* nested */
5050                                 );
5051
5052                                 foreach ( $parameterMatches as $parameterMatch ) {
5053                                         list( $magicName, $match ) = $mwArray->matchVariableStartToEnd( $parameterMatch );
5054                                         if ( $magicName ) {
5055                                                 $paramName = $paramMap[$magicName];
5056
5057                                                 switch ( $paramName ) {
5058                                                         case 'gallery-internal-alt':
5059                                                                 $alt = $this->stripAltText( $match, false );
5060                                                                 break;
5061                                                         case 'gallery-internal-link':
5062                                                                 $linkValue = strip_tags( $this->replaceLinkHoldersText( $match ) );
5063                                                                 $chars = self::EXT_LINK_URL_CLASS;
5064                                                                 $addr = self::EXT_LINK_ADDR;
5065                                                                 $prots = $this->mUrlProtocols;
5066                                                                 // check to see if link matches an absolute url, if not then it must be a wiki link.
5067                                                                 if ( preg_match( '/^-{R|(.*)}-$/', $linkValue ) ) {
5068                                                                         // Result of LanguageConverter::markNoConversion
5069                                                                         // invoked on an external link.
5070                                                                         $linkValue = substr( $linkValue, 4, -2 );
5071                                                                 }
5072                                                                 if ( preg_match( "/^($prots)$addr$chars*$/u", $linkValue ) ) {
5073                                                                         $link = $linkValue;
5074                                                                         $this->mOutput->addExternalLink( $link );
5075                                                                 } else {
5076                                                                         $localLinkTitle = Title::newFromText( $linkValue );
5077                                                                         if ( $localLinkTitle !== null ) {
5078                                                                                 $this->mOutput->addLink( $localLinkTitle );
5079                                                                                 $link = $localLinkTitle->getLinkURL();
5080                                                                         }
5081                                                                 }
5082                                                                 break;
5083                                                         default:
5084                                                                 // Must be a handler specific parameter.
5085                                                                 if ( $handler->validateParam( $paramName, $match ) ) {
5086                                                                         $handlerOptions[$paramName] = $match;
5087                                                                 } else {
5088                                                                         // Guess not, consider it as caption.
5089                                                                         wfDebug( "$parameterMatch failed parameter validation\n" );
5090                                                                         $label = '|' . $parameterMatch;
5091                                                                 }
5092                                                 }
5093
5094                                         } else {
5095                                                 // Last pipe wins.
5096                                                 $label = '|' . $parameterMatch;
5097                                         }
5098                                 }
5099                                 // Remove the pipe.
5100                                 $label = substr( $label, 1 );
5101                         }
5102
5103                         $ig->add( $title, $label, $alt, $link, $handlerOptions );
5104                 }
5105                 $html = $ig->toHTML();
5106                 Hooks::run( 'AfterParserFetchFileAndTitle', [ $this, $ig, &$html ] );
5107                 return $html;
5108         }
5109
5110         /**
5111          * @param MediaHandler $handler
5112          * @return array
5113          */
5114         public function getImageParams( $handler ) {
5115                 if ( $handler ) {
5116                         $handlerClass = get_class( $handler );
5117                 } else {
5118                         $handlerClass = '';
5119                 }
5120                 if ( !isset( $this->mImageParams[$handlerClass] ) ) {
5121                         # Initialise static lists
5122                         static $internalParamNames = [
5123                                 'horizAlign' => [ 'left', 'right', 'center', 'none' ],
5124                                 'vertAlign' => [ 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
5125                                         'bottom', 'text-bottom' ],
5126                                 'frame' => [ 'thumbnail', 'manualthumb', 'framed', 'frameless',
5127                                         'upright', 'border', 'link', 'alt', 'class' ],
5128                         ];
5129                         static $internalParamMap;
5130                         if ( !$internalParamMap ) {
5131                                 $internalParamMap = [];
5132                                 foreach ( $internalParamNames as $type => $names ) {
5133                                         foreach ( $names as $name ) {
5134                                                 // For grep: img_left, img_right, img_center, img_none,
5135                                                 // img_baseline, img_sub, img_super, img_top, img_text_top, img_middle,
5136                                                 // img_bottom, img_text_bottom,
5137                                                 // img_thumbnail, img_manualthumb, img_framed, img_frameless, img_upright,
5138                                                 // img_border, img_link, img_alt, img_class
5139                                                 $magicName = str_replace( '-', '_', "img_$name" );
5140                                                 $internalParamMap[$magicName] = [ $type, $name ];
5141                                         }
5142                                 }
5143                         }
5144
5145                         # Add handler params
5146                         $paramMap = $internalParamMap;
5147                         if ( $handler ) {
5148                                 $handlerParamMap = $handler->getParamMap();
5149                                 foreach ( $handlerParamMap as $magic => $paramName ) {
5150                                         $paramMap[$magic] = [ 'handler', $paramName ];
5151                                 }
5152                         }
5153                         $this->mImageParams[$handlerClass] = $paramMap;
5154                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
5155                 }
5156                 return [ $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] ];
5157         }
5158
5159         /**
5160          * Parse image options text and use it to make an image
5161          *
5162          * @param Title $title
5163          * @param string $options
5164          * @param LinkHolderArray|bool $holders
5165          * @return string HTML
5166          */
5167         public function makeImage( $title, $options, $holders = false ) {
5168                 # Check if the options text is of the form "options|alt text"
5169                 # Options are:
5170                 #  * thumbnail  make a thumbnail with enlarge-icon and caption, alignment depends on lang
5171                 #  * left       no resizing, just left align. label is used for alt= only
5172                 #  * right      same, but right aligned
5173                 #  * none       same, but not aligned
5174                 #  * ___px      scale to ___ pixels width, no aligning. e.g. use in taxobox
5175                 #  * center     center the image
5176                 #  * frame      Keep original image size, no magnify-button.
5177                 #  * framed     Same as "frame"
5178                 #  * frameless  like 'thumb' but without a frame. Keeps user preferences for width
5179                 #  * upright    reduce width for upright images, rounded to full __0 px
5180                 #  * border     draw a 1px border around the image
5181                 #  * alt        Text for HTML alt attribute (defaults to empty)
5182                 #  * class      Set a class for img node
5183                 #  * link       Set the target of the image link. Can be external, interwiki, or local
5184                 # vertical-align values (no % or length right now):
5185                 #  * baseline
5186                 #  * sub
5187                 #  * super
5188                 #  * top
5189                 #  * text-top
5190                 #  * middle
5191                 #  * bottom
5192                 #  * text-bottom
5193
5194                 # Protect LanguageConverter markup when splitting into parts
5195                 $parts = StringUtils::delimiterExplode(
5196                         '-{', '}-', '|', $options, true /* allow nesting */
5197                 );
5198
5199                 # Give extensions a chance to select the file revision for us
5200                 $options = [];
5201                 $descQuery = false;
5202                 Hooks::run( 'BeforeParserFetchFileAndTitle',
5203                         [ $this, $title, &$options, &$descQuery ] );
5204                 # Fetch and register the file (file title may be different via hooks)
5205                 list( $file, $title ) = $this->fetchFileAndTitle( $title, $options );
5206
5207                 # Get parameter map
5208                 $handler = $file ? $file->getHandler() : false;
5209
5210                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
5211
5212                 if ( !$file ) {
5213                         $this->addTrackingCategory( 'broken-file-category' );
5214                 }
5215
5216                 # Process the input parameters
5217                 $caption = '';
5218                 $params = [ 'frame' => [], 'handler' => [],
5219                         'horizAlign' => [], 'vertAlign' => [] ];
5220                 $seenformat = false;
5221                 foreach ( $parts as $part ) {
5222                         $part = trim( $part );
5223                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
5224                         $validated = false;
5225                         if ( isset( $paramMap[$magicName] ) ) {
5226                                 list( $type, $paramName ) = $paramMap[$magicName];
5227
5228                                 # Special case; width and height come in one variable together
5229                                 if ( $type === 'handler' && $paramName === 'width' ) {
5230                                         $parsedWidthParam = self::parseWidthParam( $value );
5231                                         if ( isset( $parsedWidthParam['width'] ) ) {
5232                                                 $width = $parsedWidthParam['width'];
5233                                                 if ( $handler->validateParam( 'width', $width ) ) {
5234                                                         $params[$type]['width'] = $width;
5235                                                         $validated = true;
5236                                                 }
5237                                         }
5238                                         if ( isset( $parsedWidthParam['height'] ) ) {
5239                                                 $height = $parsedWidthParam['height'];
5240                                                 if ( $handler->validateParam( 'height', $height ) ) {
5241                                                         $params[$type]['height'] = $height;
5242                                                         $validated = true;
5243                                                 }
5244                                         }
5245                                         # else no validation -- T15436
5246                                 } else {
5247                                         if ( $type === 'handler' ) {
5248                                                 # Validate handler parameter
5249                                                 $validated = $handler->validateParam( $paramName, $value );
5250                                         } else {
5251                                                 # Validate internal parameters
5252                                                 switch ( $paramName ) {
5253                                                         case 'manualthumb':
5254                                                         case 'alt':
5255                                                         case 'class':
5256                                                                 # @todo FIXME: Possibly check validity here for
5257                                                                 # manualthumb? downstream behavior seems odd with
5258                                                                 # missing manual thumbs.
5259                                                                 $validated = true;
5260                                                                 $value = $this->stripAltText( $value, $holders );
5261                                                                 break;
5262                                                         case 'link':
5263                                                                 $chars = self::EXT_LINK_URL_CLASS;
5264                                                                 $addr = self::EXT_LINK_ADDR;
5265                                                                 $prots = $this->mUrlProtocols;
5266                                                                 if ( $value === '' ) {
5267                                                                         $paramName = 'no-link';
5268                                                                         $value = true;
5269                                                                         $validated = true;
5270                                                                 } elseif ( preg_match( "/^((?i)$prots)/", $value ) ) {
5271                                                                         if ( preg_match( "/^((?i)$prots)$addr$chars*$/u", $value, $m ) ) {
5272                                                                                 $paramName = 'link-url';
5273                                                                                 $this->mOutput->addExternalLink( $value );
5274                                                                                 if ( $this->mOptions->getExternalLinkTarget() ) {
5275                                                                                         $params[$type]['link-target'] = $this->mOptions->getExternalLinkTarget();
5276                                                                                 }
5277                                                                                 $validated = true;
5278                                                                         }
5279                                                                 } else {
5280                                                                         $linkTitle = Title::newFromText( $value );
5281                                                                         if ( $linkTitle ) {
5282                                                                                 $paramName = 'link-title';
5283                                                                                 $value = $linkTitle;
5284                                                                                 $this->mOutput->addLink( $linkTitle );
5285                                                                                 $validated = true;
5286                                                                         }
5287                                                                 }
5288                                                                 break;
5289                                                         case 'frameless':
5290                                                         case 'framed':
5291                                                         case 'thumbnail':
5292                                                                 // use first appearing option, discard others.
5293                                                                 $validated = !$seenformat;
5294                                                                 $seenformat = true;
5295                                                                 break;
5296                                                         default:
5297                                                                 # Most other things appear to be empty or numeric...
5298                                                                 $validated = ( $value === false || is_numeric( trim( $value ) ) );
5299                                                 }
5300                                         }
5301
5302                                         if ( $validated ) {
5303                                                 $params[$type][$paramName] = $value;
5304                                         }
5305                                 }
5306                         }
5307                         if ( !$validated ) {
5308                                 $caption = $part;
5309                         }
5310                 }
5311
5312                 # Process alignment parameters
5313                 if ( $params['horizAlign'] ) {
5314                         $params['frame']['align'] = key( $params['horizAlign'] );
5315                 }
5316                 if ( $params['vertAlign'] ) {
5317                         $params['frame']['valign'] = key( $params['vertAlign'] );
5318                 }
5319
5320                 $params['frame']['caption'] = $caption;
5321
5322                 # Will the image be presented in a frame, with the caption below?
5323                 $imageIsFramed = isset( $params['frame']['frame'] )
5324                         || isset( $params['frame']['framed'] )
5325                         || isset( $params['frame']['thumbnail'] )
5326                         || isset( $params['frame']['manualthumb'] );
5327
5328                 # In the old days, [[Image:Foo|text...]] would set alt text.  Later it
5329                 # came to also set the caption, ordinary text after the image -- which
5330                 # makes no sense, because that just repeats the text multiple times in
5331                 # screen readers.  It *also* came to set the title attribute.
5332                 # Now that we have an alt attribute, we should not set the alt text to
5333                 # equal the caption: that's worse than useless, it just repeats the
5334                 # text.  This is the framed/thumbnail case.  If there's no caption, we
5335                 # use the unnamed parameter for alt text as well, just for the time be-
5336                 # ing, if the unnamed param is set and the alt param is not.
5337                 # For the future, we need to figure out if we want to tweak this more,
5338                 # e.g., introducing a title= parameter for the title; ignoring the un-
5339                 # named parameter entirely for images without a caption; adding an ex-
5340                 # plicit caption= parameter and preserving the old magic unnamed para-
5341                 # meter for BC; ...
5342                 if ( $imageIsFramed ) { # Framed image
5343                         if ( $caption === '' && !isset( $params['frame']['alt'] ) ) {
5344                                 # No caption or alt text, add the filename as the alt text so
5345                                 # that screen readers at least get some description of the image
5346                                 $params['frame']['alt'] = $title->getText();
5347                         }
5348                         # Do not set $params['frame']['title'] because tooltips don't make sense
5349                         # for framed images
5350                 } else { # Inline image
5351                         if ( !isset( $params['frame']['alt'] ) ) {
5352                                 # No alt text, use the "caption" for the alt text
5353                                 if ( $caption !== '' ) {
5354                                         $params['frame']['alt'] = $this->stripAltText( $caption, $holders );
5355                                 } else {
5356                                         # No caption, fall back to using the filename for the
5357                                         # alt text
5358                                         $params['frame']['alt'] = $title->getText();
5359                                 }
5360                         }
5361                         # Use the "caption" for the tooltip text
5362                         $params['frame']['title'] = $this->stripAltText( $caption, $holders );
5363                 }
5364
5365                 Hooks::run( 'ParserMakeImageParams', [ $title, $file, &$params, $this ] );
5366
5367                 # Linker does the rest
5368                 $time = isset( $options['time'] ) ? $options['time'] : false;
5369                 $ret = Linker::makeImageLink( $this, $title, $file, $params['frame'], $params['handler'],
5370                         $time, $descQuery, $this->mOptions->getThumbSize() );
5371
5372                 # Give the handler a chance to modify the parser object
5373                 if ( $handler ) {
5374                         $handler->parserTransformHook( $this, $file );
5375                 }
5376
5377                 return $ret;
5378         }
5379
5380         /**
5381          * @param string $caption
5382          * @param LinkHolderArray|bool $holders
5383          * @return mixed|string
5384          */
5385         protected function stripAltText( $caption, $holders ) {
5386                 # Strip bad stuff out of the title (tooltip).  We can't just use
5387                 # replaceLinkHoldersText() here, because if this function is called
5388                 # from replaceInternalLinks2(), mLinkHolders won't be up-to-date.
5389                 if ( $holders ) {
5390                         $tooltip = $holders->replaceText( $caption );
5391                 } else {
5392                         $tooltip = $this->replaceLinkHoldersText( $caption );
5393                 }
5394
5395                 # make sure there are no placeholders in thumbnail attributes
5396                 # that are later expanded to html- so expand them now and
5397                 # remove the tags
5398                 $tooltip = $this->mStripState->unstripBoth( $tooltip );
5399                 $tooltip = Sanitizer::stripAllTags( $tooltip );
5400
5401                 return $tooltip;
5402         }
5403
5404         /**
5405          * Set a flag in the output object indicating that the content is dynamic and
5406          * shouldn't be cached.
5407          * @deprecated since 1.28; use getOutput()->updateCacheExpiry()
5408          */
5409         public function disableCache() {
5410                 wfDebug( "Parser output marked as uncacheable.\n" );
5411                 if ( !$this->mOutput ) {
5412                         throw new MWException( __METHOD__ .
5413                                 " can only be called when actually parsing something" );
5414                 }
5415                 $this->mOutput->updateCacheExpiry( 0 ); // new style, for consistency
5416         }
5417
5418         /**
5419          * Callback from the Sanitizer for expanding items found in HTML attribute
5420          * values, so they can be safely tested and escaped.
5421          *
5422          * @param string &$text
5423          * @param bool|PPFrame $frame
5424          * @return string
5425          */
5426         public function attributeStripCallback( &$text, $frame = false ) {
5427                 $text = $this->replaceVariables( $text, $frame );
5428                 $text = $this->mStripState->unstripBoth( $text );
5429                 return $text;
5430         }
5431
5432         /**
5433          * Accessor
5434          *
5435          * @return array
5436          */
5437         public function getTags() {
5438                 return array_merge(
5439                         array_keys( $this->mTransparentTagHooks ),
5440                         array_keys( $this->mTagHooks ),
5441                         array_keys( $this->mFunctionTagHooks )
5442                 );
5443         }
5444
5445         /**
5446          * Replace transparent tags in $text with the values given by the callbacks.
5447          *
5448          * Transparent tag hooks are like regular XML-style tag hooks, except they
5449          * operate late in the transformation sequence, on HTML instead of wikitext.
5450          *
5451          * @param string $text
5452          *
5453          * @return string
5454          */
5455         public function replaceTransparentTags( $text ) {
5456                 $matches = [];
5457                 $elements = array_keys( $this->mTransparentTagHooks );
5458                 $text = self::extractTagsAndParams( $elements, $text, $matches );
5459                 $replacements = [];
5460
5461                 foreach ( $matches as $marker => $data ) {
5462                         list( $element, $content, $params, $tag ) = $data;
5463                         $tagName = strtolower( $element );
5464                         if ( isset( $this->mTransparentTagHooks[$tagName] ) ) {
5465                                 $output = call_user_func_array(
5466                                         $this->mTransparentTagHooks[$tagName],
5467                                         [ $content, $params, $this ]
5468                                 );
5469                         } else {
5470                                 $output = $tag;
5471                         }
5472                         $replacements[$marker] = $output;
5473                 }
5474                 return strtr( $text, $replacements );
5475         }
5476
5477         /**
5478          * Break wikitext input into sections, and either pull or replace
5479          * some particular section's text.
5480          *
5481          * External callers should use the getSection and replaceSection methods.
5482          *
5483          * @param string $text Page wikitext
5484          * @param string|int $sectionId A section identifier string of the form:
5485          *   "<flag1> - <flag2> - ... - <section number>"
5486          *
5487          * Currently the only recognised flag is "T", which means the target section number
5488          * was derived during a template inclusion parse, in other words this is a template
5489          * section edit link. If no flags are given, it was an ordinary section edit link.
5490          * This flag is required to avoid a section numbering mismatch when a section is
5491          * enclosed by "<includeonly>" (T8563).
5492          *
5493          * The section number 0 pulls the text before the first heading; other numbers will
5494          * pull the given section along with its lower-level subsections. If the section is
5495          * not found, $mode=get will return $newtext, and $mode=replace will return $text.
5496          *
5497          * Section 0 is always considered to exist, even if it only contains the empty
5498          * string. If $text is the empty string and section 0 is replaced, $newText is
5499          * returned.
5500          *
5501          * @param string $mode One of "get" or "replace"
5502          * @param string $newText Replacement text for section data.
5503          * @return string For "get", the extracted section text.
5504          *   for "replace", the whole page with the section replaced.
5505          */
5506         private function extractSections( $text, $sectionId, $mode, $newText = '' ) {
5507                 global $wgTitle; # not generally used but removes an ugly failure mode
5508
5509                 $magicScopeVariable = $this->lock();
5510                 $this->startParse( $wgTitle, new ParserOptions, self::OT_PLAIN, true );
5511                 $outText = '';
5512                 $frame = $this->getPreprocessor()->newFrame();
5513
5514                 # Process section extraction flags
5515                 $flags = 0;
5516                 $sectionParts = explode( '-', $sectionId );
5517                 $sectionIndex = array_pop( $sectionParts );
5518                 foreach ( $sectionParts as $part ) {
5519                         if ( $part === 'T' ) {
5520                                 $flags |= self::PTD_FOR_INCLUSION;
5521                         }
5522                 }
5523
5524                 # Check for empty input
5525                 if ( strval( $text ) === '' ) {
5526                         # Only sections 0 and T-0 exist in an empty document
5527                         if ( $sectionIndex == 0 ) {
5528                                 if ( $mode === 'get' ) {
5529                                         return '';
5530                                 } else {
5531                                         return $newText;
5532                                 }
5533                         } else {
5534                                 if ( $mode === 'get' ) {
5535                                         return $newText;
5536                                 } else {
5537                                         return $text;
5538                                 }
5539                         }
5540                 }
5541
5542                 # Preprocess the text
5543                 $root = $this->preprocessToDom( $text, $flags );
5544
5545                 # <h> nodes indicate section breaks
5546                 # They can only occur at the top level, so we can find them by iterating the root's children
5547                 $node = $root->getFirstChild();
5548
5549                 # Find the target section
5550                 if ( $sectionIndex == 0 ) {
5551                         # Section zero doesn't nest, level=big
5552                         $targetLevel = 1000;
5553                 } else {
5554                         while ( $node ) {
5555                                 if ( $node->getName() === 'h' ) {
5556                                         $bits = $node->splitHeading();
5557                                         if ( $bits['i'] == $sectionIndex ) {
5558                                                 $targetLevel = $bits['level'];
5559                                                 break;
5560                                         }
5561                                 }
5562                                 if ( $mode === 'replace' ) {
5563                                         $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
5564                                 }
5565                                 $node = $node->getNextSibling();
5566                         }
5567                 }
5568
5569                 if ( !$node ) {
5570                         # Not found
5571                         if ( $mode === 'get' ) {
5572                                 return $newText;
5573                         } else {
5574                                 return $text;
5575                         }
5576                 }
5577
5578                 # Find the end of the section, including nested sections
5579                 do {
5580                         if ( $node->getName() === 'h' ) {
5581                                 $bits = $node->splitHeading();
5582                                 $curLevel = $bits['level'];
5583                                 if ( $bits['i'] != $sectionIndex && $curLevel <= $targetLevel ) {
5584                                         break;
5585                                 }
5586                         }
5587                         if ( $mode === 'get' ) {
5588                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
5589                         }
5590                         $node = $node->getNextSibling();
5591                 } while ( $node );
5592
5593                 # Write out the remainder (in replace mode only)
5594                 if ( $mode === 'replace' ) {
5595                         # Output the replacement text
5596                         # Add two newlines on -- trailing whitespace in $newText is conventionally
5597                         # stripped by the editor, so we need both newlines to restore the paragraph gap
5598                         # Only add trailing whitespace if there is newText
5599                         if ( $newText != "" ) {
5600                                 $outText .= $newText . "\n\n";
5601                         }
5602
5603                         while ( $node ) {
5604                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
5605                                 $node = $node->getNextSibling();
5606                         }
5607                 }
5608
5609                 if ( is_string( $outText ) ) {
5610                         # Re-insert stripped tags
5611                         $outText = rtrim( $this->mStripState->unstripBoth( $outText ) );
5612                 }
5613
5614                 return $outText;
5615         }
5616
5617         /**
5618          * This function returns the text of a section, specified by a number ($section).
5619          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
5620          * the first section before any such heading (section 0).
5621          *
5622          * If a section contains subsections, these are also returned.
5623          *
5624          * @param string $text Text to look in
5625          * @param string|int $sectionId Section identifier as a number or string
5626          * (e.g. 0, 1 or 'T-1').
5627          * @param string $defaultText Default to return if section is not found
5628          *
5629          * @return string Text of the requested section
5630          */
5631         public function getSection( $text, $sectionId, $defaultText = '' ) {
5632                 return $this->extractSections( $text, $sectionId, 'get', $defaultText );
5633         }
5634
5635         /**
5636          * This function returns $oldtext after the content of the section
5637          * specified by $section has been replaced with $text. If the target
5638          * section does not exist, $oldtext is returned unchanged.
5639          *
5640          * @param string $oldText Former text of the article
5641          * @param string|int $sectionId Section identifier as a number or string
5642          * (e.g. 0, 1 or 'T-1').
5643          * @param string $newText Replacing text
5644          *
5645          * @return string Modified text
5646          */
5647         public function replaceSection( $oldText, $sectionId, $newText ) {
5648                 return $this->extractSections( $oldText, $sectionId, 'replace', $newText );
5649         }
5650
5651         /**
5652          * Get the ID of the revision we are parsing
5653          *
5654          * @return int|null
5655          */
5656         public function getRevisionId() {
5657                 return $this->mRevisionId;
5658         }
5659
5660         /**
5661          * Get the revision object for $this->mRevisionId
5662          *
5663          * @return Revision|null Either a Revision object or null
5664          * @since 1.23 (public since 1.23)
5665          */
5666         public function getRevisionObject() {
5667                 if ( !is_null( $this->mRevisionObject ) ) {
5668                         return $this->mRevisionObject;
5669                 }
5670                 if ( is_null( $this->mRevisionId ) ) {
5671                         return null;
5672                 }
5673
5674                 $rev = call_user_func(
5675                         $this->mOptions->getCurrentRevisionCallback(), $this->getTitle(), $this
5676                 );
5677
5678                 # If the parse is for a new revision, then the callback should have
5679                 # already been set to force the object and should match mRevisionId.
5680                 # If not, try to fetch by mRevisionId for sanity.
5681                 if ( $rev && $rev->getId() != $this->mRevisionId ) {
5682                         $rev = Revision::newFromId( $this->mRevisionId );
5683                 }
5684
5685                 $this->mRevisionObject = $rev;
5686
5687                 return $this->mRevisionObject;
5688         }
5689
5690         /**
5691          * Get the timestamp associated with the current revision, adjusted for
5692          * the default server-local timestamp
5693          * @return string
5694          */
5695         public function getRevisionTimestamp() {
5696                 if ( is_null( $this->mRevisionTimestamp ) ) {
5697                         global $wgContLang;
5698
5699                         $revObject = $this->getRevisionObject();
5700                         $timestamp = $revObject ? $revObject->getTimestamp() : wfTimestampNow();
5701
5702                         # The cryptic '' timezone parameter tells to use the site-default
5703                         # timezone offset instead of the user settings.
5704                         # Since this value will be saved into the parser cache, served
5705                         # to other users, and potentially even used inside links and such,
5706                         # it needs to be consistent for all visitors.
5707                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
5708
5709                 }
5710                 return $this->mRevisionTimestamp;
5711         }
5712
5713         /**
5714          * Get the name of the user that edited the last revision
5715          *
5716          * @return string User name
5717          */
5718         public function getRevisionUser() {
5719                 if ( is_null( $this->mRevisionUser ) ) {
5720                         $revObject = $this->getRevisionObject();
5721
5722                         # if this template is subst: the revision id will be blank,
5723                         # so just use the current user's name
5724                         if ( $revObject ) {
5725                                 $this->mRevisionUser = $revObject->getUserText();
5726                         } elseif ( $this->ot['wiki'] || $this->mOptions->getIsPreview() ) {
5727                                 $this->mRevisionUser = $this->getUser()->getName();
5728                         }
5729                 }
5730                 return $this->mRevisionUser;
5731         }
5732
5733         /**
5734          * Get the size of the revision
5735          *
5736          * @return int|null Revision size
5737          */
5738         public function getRevisionSize() {
5739                 if ( is_null( $this->mRevisionSize ) ) {
5740                         $revObject = $this->getRevisionObject();
5741
5742                         # if this variable is subst: the revision id will be blank,
5743                         # so just use the parser input size, because the own substituation
5744                         # will change the size.
5745                         if ( $revObject ) {
5746                                 $this->mRevisionSize = $revObject->getSize();
5747                         } else {
5748                                 $this->mRevisionSize = $this->mInputSize;
5749                         }
5750                 }
5751                 return $this->mRevisionSize;
5752         }
5753
5754         /**
5755          * Mutator for $mDefaultSort
5756          *
5757          * @param string $sort New value
5758          */
5759         public function setDefaultSort( $sort ) {
5760                 $this->mDefaultSort = $sort;
5761                 $this->mOutput->setProperty( 'defaultsort', $sort );
5762         }
5763
5764         /**
5765          * Accessor for $mDefaultSort
5766          * Will use the empty string if none is set.
5767          *
5768          * This value is treated as a prefix, so the
5769          * empty string is equivalent to sorting by
5770          * page name.
5771          *
5772          * @return string
5773          */
5774         public function getDefaultSort() {
5775                 if ( $this->mDefaultSort !== false ) {
5776                         return $this->mDefaultSort;
5777                 } else {
5778                         return '';
5779                 }
5780         }
5781
5782         /**
5783          * Accessor for $mDefaultSort
5784          * Unlike getDefaultSort(), will return false if none is set
5785          *
5786          * @return string|bool
5787          */
5788         public function getCustomDefaultSort() {
5789                 return $this->mDefaultSort;
5790         }
5791
5792         private static function getSectionNameFromStrippedText( $text ) {
5793                 $text = Sanitizer::normalizeSectionNameWhitespace( $text );
5794                 $text = Sanitizer::decodeCharReferences( $text );
5795                 $text = self::normalizeSectionName( $text );
5796                 return $text;
5797         }
5798
5799         private static function makeAnchor( $sectionName ) {
5800                 return '#' . Sanitizer::escapeIdForLink( $sectionName );
5801         }
5802
5803         private static function makeLegacyAnchor( $sectionName ) {
5804                 global $wgFragmentMode;
5805                 if ( isset( $wgFragmentMode[1] ) && $wgFragmentMode[1] === 'legacy' ) {
5806                         // ForAttribute() and ForLink() are the same for legacy encoding
5807                         $id = Sanitizer::escapeIdForAttribute( $sectionName, Sanitizer::ID_FALLBACK );
5808                 } else {
5809                         $id = Sanitizer::escapeIdForLink( $sectionName );
5810                 }
5811
5812                 return "#$id";
5813         }
5814
5815         /**
5816          * Try to guess the section anchor name based on a wikitext fragment
5817          * presumably extracted from a heading, for example "Header" from
5818          * "== Header ==".
5819          *
5820          * @param string $text
5821          * @return string Anchor (starting with '#')
5822          */
5823         public function guessSectionNameFromWikiText( $text ) {
5824                 # Strip out wikitext links(they break the anchor)
5825                 $text = $this->stripSectionName( $text );
5826                 $sectionName = self::getSectionNameFromStrippedText( $text );
5827                 return self::makeAnchor( $sectionName );
5828         }
5829
5830         /**
5831          * Same as guessSectionNameFromWikiText(), but produces legacy anchors
5832          * instead, if possible. For use in redirects, since various versions
5833          * of Microsoft browsers interpret Location: headers as something other
5834          * than UTF-8, resulting in breakage.
5835          *
5836          * @param string $text The section name
5837          * @return string Anchor (starting with '#')
5838          */
5839         public function guessLegacySectionNameFromWikiText( $text ) {
5840                 # Strip out wikitext links(they break the anchor)
5841                 $text = $this->stripSectionName( $text );
5842                 $sectionName = self::getSectionNameFromStrippedText( $text );
5843                 return self::makeLegacyAnchor( $sectionName );
5844         }
5845
5846         /**
5847          * Like guessSectionNameFromWikiText(), but takes already-stripped text as input.
5848          * @param string $text Section name (plain text)
5849          * @return string Anchor (starting with '#')
5850          */
5851         public static function guessSectionNameFromStrippedText( $text ) {
5852                 $sectionName = self::getSectionNameFromStrippedText( $text );
5853                 return self::makeAnchor( $sectionName );
5854         }
5855
5856         /**
5857          * Apply the same normalization as code making links to this section would
5858          *
5859          * @param string $text
5860          * @return string
5861          */
5862         private static function normalizeSectionName( $text ) {
5863                 # T90902: ensure the same normalization is applied for IDs as to links
5864                 $titleParser = MediaWikiServices::getInstance()->getTitleParser();
5865                 try {
5866
5867                         $parts = $titleParser->splitTitleString( "#$text" );
5868                 } catch ( MalformedTitleException $ex ) {
5869                         return $text;
5870                 }
5871                 return $parts['fragment'];
5872         }
5873
5874         /**
5875          * Strips a text string of wikitext for use in a section anchor
5876          *
5877          * Accepts a text string and then removes all wikitext from the
5878          * string and leaves only the resultant text (i.e. the result of
5879          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
5880          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
5881          * to create valid section anchors by mimicing the output of the
5882          * parser when headings are parsed.
5883          *
5884          * @param string $text Text string to be stripped of wikitext
5885          * for use in a Section anchor
5886          * @return string Filtered text string
5887          */
5888         public function stripSectionName( $text ) {
5889                 # Strip internal link markup
5890                 $text = preg_replace( '/\[\[:?([^[|]+)\|([^[]+)\]\]/', '$2', $text );
5891                 $text = preg_replace( '/\[\[:?([^[]+)\|?\]\]/', '$1', $text );
5892
5893                 # Strip external link markup
5894                 # @todo FIXME: Not tolerant to blank link text
5895                 # I.E. [https://www.mediawiki.org] will render as [1] or something depending
5896                 # on how many empty links there are on the page - need to figure that out.
5897                 $text = preg_replace( '/\[(?i:' . $this->mUrlProtocols . ')([^ ]+?) ([^[]+)\]/', '$2', $text );
5898
5899                 # Parse wikitext quotes (italics & bold)
5900                 $text = $this->doQuotes( $text );
5901
5902                 # Strip HTML tags
5903                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
5904                 return $text;
5905         }
5906
5907         /**
5908          * strip/replaceVariables/unstrip for preprocessor regression testing
5909          *
5910          * @param string $text
5911          * @param Title $title
5912          * @param ParserOptions $options
5913          * @param int $outputType
5914          *
5915          * @return string
5916          */
5917         public function testSrvus( $text, Title $title, ParserOptions $options,
5918                 $outputType = self::OT_HTML
5919         ) {
5920                 $magicScopeVariable = $this->lock();
5921                 $this->startParse( $title, $options, $outputType, true );
5922
5923                 $text = $this->replaceVariables( $text );
5924                 $text = $this->mStripState->unstripBoth( $text );
5925                 $text = Sanitizer::removeHTMLtags( $text );
5926                 return $text;
5927         }
5928
5929         /**
5930          * @param string $text
5931          * @param Title $title
5932          * @param ParserOptions $options
5933          * @return string
5934          */
5935         public function testPst( $text, Title $title, ParserOptions $options ) {
5936                 return $this->preSaveTransform( $text, $title, $options->getUser(), $options );
5937         }
5938
5939         /**
5940          * @param string $text
5941          * @param Title $title
5942          * @param ParserOptions $options
5943          * @return string
5944          */
5945         public function testPreprocess( $text, Title $title, ParserOptions $options ) {
5946                 return $this->testSrvus( $text, $title, $options, self::OT_PREPROCESS );
5947         }
5948
5949         /**
5950          * Call a callback function on all regions of the given text that are not
5951          * inside strip markers, and replace those regions with the return value
5952          * of the callback. For example, with input:
5953          *
5954          *  aaa<MARKER>bbb
5955          *
5956          * This will call the callback function twice, with 'aaa' and 'bbb'. Those
5957          * two strings will be replaced with the value returned by the callback in
5958          * each case.
5959          *
5960          * @param string $s
5961          * @param callable $callback
5962          *
5963          * @return string
5964          */
5965         public function markerSkipCallback( $s, $callback ) {
5966                 $i = 0;
5967                 $out = '';
5968                 while ( $i < strlen( $s ) ) {
5969                         $markerStart = strpos( $s, self::MARKER_PREFIX, $i );
5970                         if ( $markerStart === false ) {
5971                                 $out .= call_user_func( $callback, substr( $s, $i ) );
5972                                 break;
5973                         } else {
5974                                 $out .= call_user_func( $callback, substr( $s, $i, $markerStart - $i ) );
5975                                 $markerEnd = strpos( $s, self::MARKER_SUFFIX, $markerStart );
5976                                 if ( $markerEnd === false ) {
5977                                         $out .= substr( $s, $markerStart );
5978                                         break;
5979                                 } else {
5980                                         $markerEnd += strlen( self::MARKER_SUFFIX );
5981                                         $out .= substr( $s, $markerStart, $markerEnd - $markerStart );
5982                                         $i = $markerEnd;
5983                                 }
5984                         }
5985                 }
5986                 return $out;
5987         }
5988
5989         /**
5990          * Remove any strip markers found in the given text.
5991          *
5992          * @param string $text
5993          * @return string
5994          */
5995         public function killMarkers( $text ) {
5996                 return $this->mStripState->killMarkers( $text );
5997         }
5998
5999         /**
6000          * Save the parser state required to convert the given half-parsed text to
6001          * HTML. "Half-parsed" in this context means the output of
6002          * recursiveTagParse() or internalParse(). This output has strip markers
6003          * from replaceVariables (extensionSubstitution() etc.), and link
6004          * placeholders from replaceLinkHolders().
6005          *
6006          * Returns an array which can be serialized and stored persistently. This
6007          * array can later be loaded into another parser instance with
6008          * unserializeHalfParsedText(). The text can then be safely incorporated into
6009          * the return value of a parser hook.
6010          *
6011          * @deprecated since 1.31
6012          * @param string $text
6013          *
6014          * @return array
6015          */
6016         public function serializeHalfParsedText( $text ) {
6017                 wfDeprecated( __METHOD__, '1.31' );
6018                 $data = [
6019                         'text' => $text,
6020                         'version' => self::HALF_PARSED_VERSION,
6021                         'stripState' => $this->mStripState->getSubState( $text ),
6022                         'linkHolders' => $this->mLinkHolders->getSubArray( $text )
6023                 ];
6024                 return $data;
6025         }
6026
6027         /**
6028          * Load the parser state given in the $data array, which is assumed to
6029          * have been generated by serializeHalfParsedText(). The text contents is
6030          * extracted from the array, and its markers are transformed into markers
6031          * appropriate for the current Parser instance. This transformed text is
6032          * returned, and can be safely included in the return value of a parser
6033          * hook.
6034          *
6035          * If the $data array has been stored persistently, the caller should first
6036          * check whether it is still valid, by calling isValidHalfParsedText().
6037          *
6038          * @deprecated since 1.31
6039          * @param array $data Serialized data
6040          * @throws MWException
6041          * @return string
6042          */
6043         public function unserializeHalfParsedText( $data ) {
6044                 wfDeprecated( __METHOD__, '1.31' );
6045                 if ( !isset( $data['version'] ) || $data['version'] != self::HALF_PARSED_VERSION ) {
6046                         throw new MWException( __METHOD__ . ': invalid version' );
6047                 }
6048
6049                 # First, extract the strip state.
6050                 $texts = [ $data['text'] ];
6051                 $texts = $this->mStripState->merge( $data['stripState'], $texts );
6052
6053                 # Now renumber links
6054                 $texts = $this->mLinkHolders->mergeForeign( $data['linkHolders'], $texts );
6055
6056                 # Should be good to go.
6057                 return $texts[0];
6058         }
6059
6060         /**
6061          * Returns true if the given array, presumed to be generated by
6062          * serializeHalfParsedText(), is compatible with the current version of the
6063          * parser.
6064          *
6065          * @deprecated since 1.31
6066          * @param array $data
6067          *
6068          * @return bool
6069          */
6070         public function isValidHalfParsedText( $data ) {
6071                 wfDeprecated( __METHOD__, '1.31' );
6072                 return isset( $data['version'] ) && $data['version'] == self::HALF_PARSED_VERSION;
6073         }
6074
6075         /**
6076          * Parsed a width param of imagelink like 300px or 200x300px
6077          *
6078          * @param string $value
6079          * @param bool $parseHeight
6080          *
6081          * @return array
6082          * @since 1.20
6083          */
6084         public static function parseWidthParam( $value, $parseHeight = true ) {
6085                 $parsedWidthParam = [];
6086                 if ( $value === '' ) {
6087                         return $parsedWidthParam;
6088                 }
6089                 $m = [];
6090                 # (T15500) In both cases (width/height and width only),
6091                 # permit trailing "px" for backward compatibility.
6092                 if ( $parseHeight && preg_match( '/^([0-9]*)x([0-9]*)\s*(?:px)?\s*$/', $value, $m ) ) {
6093                         $width = intval( $m[1] );
6094                         $height = intval( $m[2] );
6095                         $parsedWidthParam['width'] = $width;
6096                         $parsedWidthParam['height'] = $height;
6097                 } elseif ( preg_match( '/^[0-9]*\s*(?:px)?\s*$/', $value ) ) {
6098                         $width = intval( $value );
6099                         $parsedWidthParam['width'] = $width;
6100                 }
6101                 return $parsedWidthParam;
6102         }
6103
6104         /**
6105          * Lock the current instance of the parser.
6106          *
6107          * This is meant to stop someone from calling the parser
6108          * recursively and messing up all the strip state.
6109          *
6110          * @throws MWException If parser is in a parse
6111          * @return ScopedCallback The lock will be released once the return value goes out of scope.
6112          */
6113         protected function lock() {
6114                 if ( $this->mInParse ) {
6115                         throw new MWException( "Parser state cleared while parsing. "
6116                                 . "Did you call Parser::parse recursively? Lock is held by: " . $this->mInParse );
6117                 }
6118
6119                 // Save the backtrace when locking, so that if some code tries locking again,
6120                 // we can print the lock owner's backtrace for easier debugging
6121                 $e = new Exception;
6122                 $this->mInParse = $e->getTraceAsString();
6123
6124                 $recursiveCheck = new ScopedCallback( function () {
6125                         $this->mInParse = false;
6126                 } );
6127
6128                 return $recursiveCheck;
6129         }
6130
6131         /**
6132          * Strip outer <p></p> tag from the HTML source of a single paragraph.
6133          *
6134          * Returns original HTML if the <p/> tag has any attributes, if there's no wrapping <p/> tag,
6135          * or if there is more than one <p/> tag in the input HTML.
6136          *
6137          * @param string $html
6138          * @return string
6139          * @since 1.24
6140          */
6141         public static function stripOuterParagraph( $html ) {
6142                 $m = [];
6143                 if ( preg_match( '/^<p>(.*)\n?<\/p>\n?$/sU', $html, $m ) ) {
6144                         if ( strpos( $m[1], '</p>' ) === false ) {
6145                                 $html = $m[1];
6146                         }
6147                 }
6148
6149                 return $html;
6150         }
6151
6152         /**
6153          * Return this parser if it is not doing anything, otherwise
6154          * get a fresh parser. You can use this method by doing
6155          * $myParser = $wgParser->getFreshParser(), or more simply
6156          * $wgParser->getFreshParser()->parse( ... );
6157          * if you're unsure if $wgParser is safe to use.
6158          *
6159          * @since 1.24
6160          * @return Parser A parser object that is not parsing anything
6161          */
6162         public function getFreshParser() {
6163                 global $wgParserConf;
6164                 if ( $this->mInParse ) {
6165                         return new $wgParserConf['class']( $wgParserConf );
6166                 } else {
6167                         return $this;
6168                 }
6169         }
6170
6171         /**
6172          * Set's up the PHP implementation of OOUI for use in this request
6173          * and instructs OutputPage to enable OOUI for itself.
6174          *
6175          * @since 1.26
6176          */
6177         public function enableOOUI() {
6178                 OutputPage::setupOOUI();
6179                 $this->mOutput->setEnableOOUI( true );
6180         }
6181 }