includes/parser/LinkHolderArray.php

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