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