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   1  <?php
   2  /**
   3   * Holder of replacement pairs for wiki links
   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  
  24  /**
  25   * @ingroup Parser
  26   */
  27  class LinkHolderArray {
  28      public $internals = array();
  29      public $interwikis = array();
  30      public $size = 0;
  31  
  32      /**
  33       * @var Parser
  34       */
  35      public $parent;
  36      protected $tempIdOffset;
  37  
  38      /**
  39       * @param Parser $parent
  40       */
  41  	public function __construct( $parent ) {
  42          $this->parent = $parent;
  43      }
  44  
  45      /**
  46       * Reduce memory usage to reduce the impact of circular references
  47       */
  48  	public function __destruct() {
  49          foreach ( $this as $name => $value ) {
  50              unset( $this->$name );
  51          }
  52      }
  53  
  54      /**
  55       * Don't serialize the parent object, it is big, and not needed when it is
  56       * a parameter to mergeForeign(), which is the only application of
  57       * serializing at present.
  58       *
  59       * Compact the titles, only serialize the text form.
  60       * @return array
  61       */
  62  	public function __sleep() {
  63          foreach ( $this->internals as &$nsLinks ) {
  64              foreach ( $nsLinks as &$entry ) {
  65                  unset( $entry['title'] );
  66              }
  67          }
  68          unset( $nsLinks );
  69          unset( $entry );
  70  
  71          foreach ( $this->interwikis as &$entry ) {
  72              unset( $entry['title'] );
  73          }
  74          unset( $entry );
  75  
  76          return array( 'internals', 'interwikis', 'size' );
  77      }
  78  
  79      /**
  80       * Recreate the Title objects
  81       */
  82  	public function __wakeup() {
  83          foreach ( $this->internals as &$nsLinks ) {
  84              foreach ( $nsLinks as &$entry ) {
  85                  $entry['title'] = Title::newFromText( $entry['pdbk'] );
  86              }
  87          }
  88          unset( $nsLinks );
  89          unset( $entry );
  90  
  91          foreach ( $this->interwikis as &$entry ) {
  92              $entry['title'] = Title::newFromText( $entry['pdbk'] );
  93          }
  94          unset( $entry );
  95      }
  96  
  97      /**
  98       * Merge another LinkHolderArray into this one
  99       * @param LinkHolderArray $other
 100       */
 101  	public function merge( $other ) {
 102          foreach ( $other->internals as $ns => $entries ) {
 103              $this->size += count( $entries );
 104              if ( !isset( $this->internals[$ns] ) ) {
 105                  $this->internals[$ns] = $entries;
 106              } else {
 107                  $this->internals[$ns] += $entries;
 108              }
 109          }
 110          $this->interwikis += $other->interwikis;
 111      }
 112  
 113      /**
 114       * Merge a LinkHolderArray from another parser instance into this one. The
 115       * keys will not be preserved. Any text which went with the old
 116       * LinkHolderArray and needs to work with the new one should be passed in
 117       * the $texts array. The strings in this array will have their link holders
 118       * converted for use in the destination link holder. The resulting array of
 119       * strings will be returned.
 120       *
 121       * @param LinkHolderArray $other
 122       * @param array $texts Array of strings
 123       * @return array
 124       */
 125  	public function mergeForeign( $other, $texts ) {
 126          $this->tempIdOffset = $idOffset = $this->parent->nextLinkID();
 127          $maxId = 0;
 128  
 129          # Renumber internal links
 130          foreach ( $other->internals as $ns => $nsLinks ) {
 131              foreach ( $nsLinks as $key => $entry ) {
 132                  $newKey = $idOffset + $key;
 133                  $this->internals[$ns][$newKey] = $entry;
 134                  $maxId = $newKey > $maxId ? $newKey : $maxId;
 135              }
 136          }
 137          $texts = preg_replace_callback( '/(<!--LINK \d+:)(\d+)(-->)/',
 138              array( $this, 'mergeForeignCallback' ), $texts );
 139  
 140          # Renumber interwiki links
 141          foreach ( $other->interwikis as $key => $entry ) {
 142              $newKey = $idOffset + $key;
 143              $this->interwikis[$newKey] = $entry;
 144              $maxId = $newKey > $maxId ? $newKey : $maxId;
 145          }
 146          $texts = preg_replace_callback( '/(<!--IWLINK )(\d+)(-->)/',
 147              array( $this, 'mergeForeignCallback' ), $texts );
 148  
 149          # Set the parent link ID to be beyond the highest used ID
 150          $this->parent->setLinkID( $maxId + 1 );
 151          $this->tempIdOffset = null;
 152          return $texts;
 153      }
 154  
 155      /**
 156       * @param array $m
 157       * @return string
 158       */
 159  	protected function mergeForeignCallback( $m ) {
 160          return $m[1] . ( $m[2] + $this->tempIdOffset ) . $m[3];
 161      }
 162  
 163      /**
 164       * Get a subset of the current LinkHolderArray which is sufficient to
 165       * interpret the given text.
 166       * @param string $text
 167       * @return LinkHolderArray
 168       */
 169  	public function getSubArray( $text ) {
 170          $sub = new LinkHolderArray( $this->parent );
 171  
 172          # Internal links
 173          $pos = 0;
 174          while ( $pos < strlen( $text ) ) {
 175              if ( !preg_match( '/<!--LINK (\d+):(\d+)-->/',
 176                  $text, $m, PREG_OFFSET_CAPTURE, $pos )
 177              ) {
 178                  break;
 179              }
 180              $ns = $m[1][0];
 181              $key = $m[2][0];
 182              $sub->internals[$ns][$key] = $this->internals[$ns][$key];
 183              $pos = $m[0][1] + strlen( $m[0][0] );
 184          }
 185  
 186          # Interwiki links
 187          $pos = 0;
 188          while ( $pos < strlen( $text ) ) {
 189              if ( !preg_match( '/<!--IWLINK (\d+)-->/', $text, $m, PREG_OFFSET_CAPTURE, $pos ) ) {
 190                  break;
 191              }
 192              $key = $m[1][0];
 193              $sub->interwikis[$key] = $this->interwikis[$key];
 194              $pos = $m[0][1] + strlen( $m[0][0] );
 195          }
 196          return $sub;
 197      }
 198  
 199      /**
 200       * Returns true if the memory requirements of this object are getting large
 201       * @return bool
 202       */
 203  	public function isBig() {
 204          global $wgLinkHolderBatchSize;
 205          return $this->size > $wgLinkHolderBatchSize;
 206      }
 207  
 208      /**
 209       * Clear all stored link holders.
 210       * Make sure you don't have any text left using these link holders, before you call this
 211       */
 212  	public function clear() {
 213          $this->internals = array();
 214          $this->interwikis = array();
 215          $this->size = 0;
 216      }
 217  
 218      /**
 219       * Make a link placeholder. The text returned can be later resolved to a real link with
 220       * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
 221       * parsing of interwiki links, and secondly to allow all existence checks and
 222       * article length checks (for stub links) to be bundled into a single query.
 223       *
 224       * @param Title $nt
 225       * @param string $text
 226       * @param array $query [optional]
 227       * @param string $trail [optional]
 228       * @param string $prefix [optional]
 229       * @return string
 230       */
 231  	public function makeHolder( $nt, $text = '', $query = array(), $trail = '', $prefix = '' ) {
 232          wfProfileIn( __METHOD__ );
 233          if ( !is_object( $nt ) ) {
 234              # Fail gracefully
 235              $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
 236          } else {
 237              # Separate the link trail from the rest of the link
 238              list( $inside, $trail ) = Linker::splitTrail( $trail );
 239  
 240              $entry = array(
 241                  'title' => $nt,
 242                  'text' => $prefix . $text . $inside,
 243                  'pdbk' => $nt->getPrefixedDBkey(),
 244              );
 245              if ( $query !== array() ) {
 246                  $entry['query'] = $query;
 247              }
 248  
 249              if ( $nt->isExternal() ) {
 250                  // Use a globally unique ID to keep the objects mergable
 251                  $key = $this->parent->nextLinkID();
 252                  $this->interwikis[$key] = $entry;
 253                  $retVal = "<!--IWLINK $key-->{$trail}";
 254              } else {
 255                  $key = $this->parent->nextLinkID();
 256                  $ns = $nt->getNamespace();
 257                  $this->internals[$ns][$key] = $entry;
 258                  $retVal = "<!--LINK $ns:$key-->{$trail}";
 259              }
 260              $this->size++;
 261          }
 262          wfProfileOut( __METHOD__ );
 263          return $retVal;
 264      }
 265  
 266      /**
 267       * Replace <!--LINK--> link placeholders with actual links, in the buffer
 268       *
 269       * @param string $text
 270       * @return array Array of link CSS classes, indexed by PDBK.
 271       */
 272  	public function replace( &$text ) {
 273          wfProfileIn( __METHOD__ );
 274  
 275          /** @todo FIXME: replaceInternal doesn't return a value */
 276          $colours = $this->replaceInternal( $text );
 277          $this->replaceInterwiki( $text );
 278  
 279          wfProfileOut( __METHOD__ );
 280          return $colours;
 281      }
 282  
 283      /**
 284       * Replace internal links
 285       * @param string $text
 286       */
 287  	protected function replaceInternal( &$text ) {
 288          if ( !$this->internals ) {
 289              return;
 290          }
 291  
 292          wfProfileIn( __METHOD__ );
 293          global $wgContLang, $wgContentHandlerUseDB;
 294  
 295          $colours = array();
 296          $linkCache = LinkCache::singleton();
 297          $output = $this->parent->getOutput();
 298  
 299          wfProfileIn( __METHOD__ . '-check' );
 300          $dbr = wfGetDB( DB_SLAVE );
 301          $threshold = $this->parent->getOptions()->getStubThreshold();
 302  
 303          # Sort by namespace
 304          ksort( $this->internals );
 305  
 306          $linkcolour_ids = array();
 307  
 308          # Generate query
 309          $queries = array();
 310          foreach ( $this->internals as $ns => $entries ) {
 311              foreach ( $entries as $entry ) {
 312                  /** @var Title $title */
 313                  $title = $entry['title'];
 314                  $pdbk = $entry['pdbk'];
 315  
 316                  # Skip invalid entries.
 317                  # Result will be ugly, but prevents crash.
 318                  if ( is_null( $title ) ) {
 319                      continue;
 320                  }
 321  
 322                  # Check if it's a static known link, e.g. interwiki
 323                  if ( $title->isAlwaysKnown() ) {
 324                      $colours[$pdbk] = '';
 325                  } elseif ( $ns == NS_SPECIAL ) {
 326                      $colours[$pdbk] = 'new';
 327                  } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
 328                      $colours[$pdbk] = Linker::getLinkColour( $title, $threshold );
 329                      $output->addLink( $title, $id );
 330                      $linkcolour_ids[$id] = $pdbk;
 331                  } elseif ( $linkCache->isBadLink( $pdbk ) ) {
 332                      $colours[$pdbk] = 'new';
 333                  } else {
 334                      # Not in the link cache, add it to the query
 335                      $queries[$ns][] = $title->getDBkey();
 336                  }
 337              }
 338          }
 339          if ( $queries ) {
 340              $where = array();
 341              foreach ( $queries as $ns => $pages ) {
 342                  $where[] = $dbr->makeList(
 343                      array(
 344                          'page_namespace' => $ns,
 345                          'page_title' => array_unique( $pages ),
 346                      ),
 347                      LIST_AND
 348                  );
 349              }
 350  
 351              $fields = array( 'page_id', 'page_namespace', 'page_title',
 352                  'page_is_redirect', 'page_len', 'page_latest' );
 353  
 354              if ( $wgContentHandlerUseDB ) {
 355                  $fields[] = 'page_content_model';
 356              }
 357  
 358              $res = $dbr->select(
 359                  'page',
 360                  $fields,
 361                  $dbr->makeList( $where, LIST_OR ),
 362                  __METHOD__
 363              );
 364  
 365              # Fetch data and form into an associative array
 366              # non-existent = broken
 367              foreach ( $res as $s ) {
 368                  $title = Title::makeTitle( $s->page_namespace, $s->page_title );
 369                  $pdbk = $title->getPrefixedDBkey();
 370                  $linkCache->addGoodLinkObjFromRow( $title, $s );
 371                  $output->addLink( $title, $s->page_id );
 372                  # @todo FIXME: Convoluted data flow
 373                  # The redirect status and length is passed to getLinkColour via the LinkCache
 374                  # Use formal parameters instead
 375                  $colours[$pdbk] = Linker::getLinkColour( $title, $threshold );
 376                  //add id to the extension todolist
 377                  $linkcolour_ids[$s->page_id] = $pdbk;
 378              }
 379              unset( $res );
 380          }
 381          if ( count( $linkcolour_ids ) ) {
 382              //pass an array of page_ids to an extension
 383              wfRunHooks( 'GetLinkColours', array( $linkcolour_ids, &$colours ) );
 384          }
 385          wfProfileOut( __METHOD__ . '-check' );
 386  
 387          # Do a second query for different language variants of links and categories
 388          if ( $wgContLang->hasVariants() ) {
 389              $this->doVariants( $colours );
 390          }
 391  
 392          # Construct search and replace arrays
 393          wfProfileIn( __METHOD__ . '-construct' );
 394          $replacePairs = array();
 395          foreach ( $this->internals as $ns => $entries ) {
 396              foreach ( $entries as $index => $entry ) {
 397                  $pdbk = $entry['pdbk'];
 398                  $title = $entry['title'];
 399                  $query = isset( $entry['query'] ) ? $entry['query'] : array();
 400                  $key = "$ns:$index";
 401                  $searchkey = "<!--LINK $key-->";
 402                  $displayText = $entry['text'];
 403                  if ( isset( $entry['selflink'] ) ) {
 404                      $replacePairs[$searchkey] = Linker::makeSelfLinkObj( $title, $displayText, $query );
 405                      continue;
 406                  }
 407                  if ( $displayText === '' ) {
 408                      $displayText = null;
 409                  }
 410                  if ( !isset( $colours[$pdbk] ) ) {
 411                      $colours[$pdbk] = 'new';
 412                  }
 413                  $attribs = array();
 414                  if ( $colours[$pdbk] == 'new' ) {
 415                      $linkCache->addBadLinkObj( $title );
 416                      $output->addLink( $title, 0 );
 417                      $type = array( 'broken' );
 418                  } else {
 419                      if ( $colours[$pdbk] != '' ) {
 420                          $attribs['class'] = $colours[$pdbk];
 421                      }
 422                      $type = array( 'known', 'noclasses' );
 423                  }
 424                  $replacePairs[$searchkey] = Linker::link( $title, $displayText,
 425                          $attribs, $query, $type );
 426              }
 427          }
 428          $replacer = new HashtableReplacer( $replacePairs, 1 );
 429          wfProfileOut( __METHOD__ . '-construct' );
 430  
 431          # Do the thing
 432          wfProfileIn( __METHOD__ . '-replace' );
 433          $text = preg_replace_callback(
 434              '/(<!--LINK .*?-->)/',
 435              $replacer->cb(),
 436              $text
 437          );
 438  
 439          wfProfileOut( __METHOD__ . '-replace' );
 440          wfProfileOut( __METHOD__ );
 441      }
 442  
 443      /**
 444       * Replace interwiki links
 445       * @param string $text
 446       */
 447  	protected function replaceInterwiki( &$text ) {
 448          if ( empty( $this->interwikis ) ) {
 449              return;
 450          }
 451  
 452          wfProfileIn( __METHOD__ );
 453          # Make interwiki link HTML
 454          $output = $this->parent->getOutput();
 455          $replacePairs = array();
 456          foreach ( $this->interwikis as $key => $link ) {
 457              $replacePairs[$key] = Linker::link( $link['title'], $link['text'] );
 458              $output->addInterwikiLink( $link['title'] );
 459          }
 460          $replacer = new HashtableReplacer( $replacePairs, 1 );
 461  
 462          $text = preg_replace_callback(
 463              '/<!--IWLINK (.*?)-->/',
 464              $replacer->cb(),
 465              $text );
 466          wfProfileOut( __METHOD__ );
 467      }
 468  
 469      /**
 470       * Modify $this->internals and $colours according to language variant linking rules
 471       * @param array $colours
 472       */
 473  	protected function doVariants( &$colours ) {
 474          global $wgContLang, $wgContentHandlerUseDB;
 475          $linkBatch = new LinkBatch();
 476          $variantMap = array(); // maps $pdbkey_Variant => $keys (of link holders)
 477          $output = $this->parent->getOutput();
 478          $linkCache = LinkCache::singleton();
 479          $threshold = $this->parent->getOptions()->getStubThreshold();
 480          $titlesToBeConverted = '';
 481          $titlesAttrs = array();
 482  
 483          // Concatenate titles to a single string, thus we only need auto convert the
 484          // single string to all variants. This would improve parser's performance
 485          // significantly.
 486          foreach ( $this->internals as $ns => $entries ) {
 487              if ( $ns == NS_SPECIAL ) {
 488                  continue;
 489              }
 490              foreach ( $entries as $index => $entry ) {
 491                  $pdbk = $entry['pdbk'];
 492                  // we only deal with new links (in its first query)
 493                  if ( !isset( $colours[$pdbk] ) || $colours[$pdbk] === 'new' ) {
 494                      $titlesAttrs[] = array( $index, $entry['title'] );
 495                      // separate titles with \0 because it would never appears
 496                      // in a valid title
 497                      $titlesToBeConverted .= $entry['title']->getText() . "\0";
 498                  }
 499              }
 500          }
 501  
 502          // Now do the conversion and explode string to text of titles
 503          $titlesAllVariants = $wgContLang->autoConvertToAllVariants( rtrim( $titlesToBeConverted, "\0" ) );
 504          $allVariantsName = array_keys( $titlesAllVariants );
 505          foreach ( $titlesAllVariants as &$titlesVariant ) {
 506              $titlesVariant = explode( "\0", $titlesVariant );
 507          }
 508  
 509          // Then add variants of links to link batch
 510          $parentTitle = $this->parent->getTitle();
 511          foreach ( $titlesAttrs as $i => $attrs ) {
 512              /** @var Title $title */
 513              list( $index, $title ) = $attrs;
 514              $ns = $title->getNamespace();
 515              $text = $title->getText();
 516  
 517              foreach ( $allVariantsName as $variantName ) {
 518                  $textVariant = $titlesAllVariants[$variantName][$i];
 519                  if ( $textVariant === $text ) {
 520                      continue;
 521                  }
 522  
 523                  $variantTitle = Title::makeTitle( $ns, $textVariant );
 524                  if ( is_null( $variantTitle ) ) {
 525                      continue;
 526                  }
 527  
 528                  // Self-link checking for mixed/different variant titles. At this point, we
 529                  // already know the exact title does not exist, so the link cannot be to a
 530                  // variant of the current title that exists as a separate page.
 531                  if ( $variantTitle->equals( $parentTitle ) && !$title->hasFragment() ) {
 532                      $this->internals[$ns][$index]['selflink'] = true;
 533                      continue 2;
 534                  }
 535  
 536                  $linkBatch->addObj( $variantTitle );
 537                  $variantMap[$variantTitle->getPrefixedDBkey()][] = "$ns:$index";
 538              }
 539          }
 540  
 541          // process categories, check if a category exists in some variant
 542          $categoryMap = array(); // maps $category_variant => $category (dbkeys)
 543          $varCategories = array(); // category replacements oldDBkey => newDBkey
 544          foreach ( $output->getCategoryLinks() as $category ) {
 545              $categoryTitle = Title::makeTitleSafe( NS_CATEGORY, $category );
 546              $linkBatch->addObj( $categoryTitle );
 547              $variants = $wgContLang->autoConvertToAllVariants( $category );
 548              foreach ( $variants as $variant ) {
 549                  if ( $variant !== $category ) {
 550                      $variantTitle = Title::makeTitleSafe( NS_CATEGORY, $variant );
 551                      if ( is_null( $variantTitle ) ) {
 552                          continue;
 553                      }
 554                      $linkBatch->addObj( $variantTitle );
 555                      $categoryMap[$variant] = array( $category, $categoryTitle );
 556                  }
 557              }
 558          }
 559  
 560          if ( !$linkBatch->isEmpty() ) {
 561              // construct query
 562              $dbr = wfGetDB( DB_SLAVE );
 563              $fields = array( 'page_id', 'page_namespace', 'page_title',
 564                  'page_is_redirect', 'page_len', 'page_latest' );
 565  
 566              if ( $wgContentHandlerUseDB ) {
 567                  $fields[] = 'page_content_model';
 568              }
 569  
 570              $varRes = $dbr->select( 'page',
 571                  $fields,
 572                  $linkBatch->constructSet( 'page', $dbr ),
 573                  __METHOD__
 574              );
 575  
 576              $linkcolour_ids = array();
 577  
 578              // for each found variants, figure out link holders and replace
 579              foreach ( $varRes as $s ) {
 580  
 581                  $variantTitle = Title::makeTitle( $s->page_namespace, $s->page_title );
 582                  $varPdbk = $variantTitle->getPrefixedDBkey();
 583                  $vardbk = $variantTitle->getDBkey();
 584  
 585                  $holderKeys = array();
 586                  if ( isset( $variantMap[$varPdbk] ) ) {
 587                      $holderKeys = $variantMap[$varPdbk];
 588                      $linkCache->addGoodLinkObjFromRow( $variantTitle, $s );
 589                      $output->addLink( $variantTitle, $s->page_id );
 590                  }
 591  
 592                  // loop over link holders
 593                  foreach ( $holderKeys as $key ) {
 594                      list( $ns, $index ) = explode( ':', $key, 2 );
 595                      $entry =& $this->internals[$ns][$index];
 596                      $pdbk = $entry['pdbk'];
 597  
 598                      if ( !isset( $colours[$pdbk] ) || $colours[$pdbk] === 'new' ) {
 599                          // found link in some of the variants, replace the link holder data
 600                          $entry['title'] = $variantTitle;
 601                          $entry['pdbk'] = $varPdbk;
 602  
 603                          // set pdbk and colour
 604                          # @todo FIXME: Convoluted data flow
 605                          # The redirect status and length is passed to getLinkColour via the LinkCache
 606                          # Use formal parameters instead
 607                          $colours[$varPdbk] = Linker::getLinkColour( $variantTitle, $threshold );
 608                          $linkcolour_ids[$s->page_id] = $pdbk;
 609                      }
 610                  }
 611  
 612                  // check if the object is a variant of a category
 613                  if ( isset( $categoryMap[$vardbk] ) ) {
 614                      list( $oldkey, $oldtitle ) = $categoryMap[$vardbk];
 615                      if ( !isset( $varCategories[$oldkey] ) && !$oldtitle->exists() ) {
 616                          $varCategories[$oldkey] = $vardbk;
 617                      }
 618                  }
 619              }
 620              wfRunHooks( 'GetLinkColours', array( $linkcolour_ids, &$colours ) );
 621  
 622              // rebuild the categories in original order (if there are replacements)
 623              if ( count( $varCategories ) > 0 ) {
 624                  $newCats = array();
 625                  $originalCats = $output->getCategories();
 626                  foreach ( $originalCats as $cat => $sortkey ) {
 627                      // make the replacement
 628                      if ( array_key_exists( $cat, $varCategories ) ) {
 629                          $newCats[$varCategories[$cat]] = $sortkey;
 630                      } else {
 631                          $newCats[$cat] = $sortkey;
 632                      }
 633                  }
 634                  $output->setCategoryLinks( $newCats );
 635              }
 636          }
 637      }
 638  
 639      /**
 640       * Replace <!--LINK--> link placeholders with plain text of links
 641       * (not HTML-formatted).
 642       *
 643       * @param string $text
 644       * @return string
 645       */
 646  	public function replaceText( $text ) {
 647          wfProfileIn( __METHOD__ );
 648  
 649          $text = preg_replace_callback(
 650              '/<!--(LINK|IWLINK) (.*?)-->/',
 651              array( &$this, 'replaceTextCallback' ),
 652              $text );
 653  
 654          wfProfileOut( __METHOD__ );
 655          return $text;
 656      }
 657  
 658      /**
 659       * Callback for replaceText()
 660       *
 661       * @param array $matches
 662       * @return string
 663       * @private
 664       */
 665  	public function replaceTextCallback( $matches ) {
 666          $type = $matches[1];
 667          $key = $matches[2];
 668          if ( $type == 'LINK' ) {
 669              list( $ns, $index ) = explode( ':', $key, 2 );
 670              if ( isset( $this->internals[$ns][$index]['text'] ) ) {
 671                  return $this->internals[$ns][$index]['text'];
 672              }
 673          } elseif ( $type == 'IWLINK' ) {
 674              if ( isset( $this->interwikis[$key]['text'] ) ) {
 675                  return $this->interwikis[$key]['text'];
 676              }
 677          }
 678          return $matches[0];
 679      }
 680  }