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