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 $texts Array 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 $query Array [optional]
 214          * @param $trail String [optional]
 215          * @param $prefix String [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 $retVal;
 251         }
 252
 253         /**
 254          * @todo FIXME: Update documentation. makeLinkObj() is deprecated.
 255          * Replace <!--LINK--> link placeholders with actual links, in the buffer
 256          * Placeholders created in Skin::makeLinkObj()
 257          * Returns an array of link CSS classes, indexed by PDBK.
 258          */
 259         function replace( &$text ) {
 260                 wfProfileIn( __METHOD__ );
 261
 262                 $colours = $this->replaceInternal( $text );
 263                 $this->replaceInterwiki( $text );
 264
 265                 wfProfileOut( __METHOD__ );
 266                 return $colours;
 267         }
 268
 269         /**
 270          * Replace internal links
 271          */
 272         protected function replaceInternal( &$text ) {
 273                 if ( !$this->internals ) {
 274                         return;
 275                 }
 276
 277                 wfProfileIn( __METHOD__ );
 278                 global $wgContLang;
 279
 280                 $colours = array();
 281                 $linkCache = LinkCache::singleton();
 282                 $output = $this->parent->getOutput();
 283
 284                 wfProfileIn( __METHOD__.'-check' );
 285                 $dbr = wfGetDB( DB_SLAVE );
 286                 $threshold = $this->parent->getOptions()->getStubThreshold();
 287
 288                 # Sort by namespace
 289                 ksort( $this->internals );
 290
 291                 $linkcolour_ids = array();
 292
 293                 # Generate query
 294                 $queries = array();
 295                 foreach ( $this->internals as $ns => $entries ) {
 296                         foreach ( $entries as $entry ) {
 297                                 $title = $entry['title'];
 298                                 $pdbk = $entry['pdbk'];
 299
 300                                 # Skip invalid entries.
 301                                 # Result will be ugly, but prevents crash.
 302                                 if ( is_null( $title ) ) {
 303                                         continue;
 304                                 }
 305
 306                                 # Check if it's a static known link, e.g. interwiki
 307                                 if ( $title->isAlwaysKnown() ) {
 308                                         $colours[$pdbk] = '';
 309                                 } elseif ( $ns == NS_SPECIAL ) {
 310                                         $colours[$pdbk] = 'new';
 311                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
 312                                         $colours[$pdbk] = Linker::getLinkColour( $title, $threshold );
 313                                         $output->addLink( $title, $id );
 314                                         $linkcolour_ids[$id] = $pdbk;
 315                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
 316                                         $colours[$pdbk] = 'new';
 317                                 } else {
 318                                         # Not in the link cache, add it to the query
 319                                         $queries[$ns][] = $title->getDBkey();
 320                                 }
 321                         }
 322                 }
 323                 if ( $queries ) {
 324                         $where = array();
 325                         foreach( $queries as $ns => $pages ){
 326                                 $where[] = $dbr->makeList(
 327                                         array(
 328                                                 'page_namespace' => $ns,
 329                                                 'page_title' => $pages,
 330                                         ),
 331                                         LIST_AND
 332                                 );
 333                         }
 334
 335                         $res = $dbr->select(
 336                                 'page',
 337                                 array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect', 'page_len', 'page_latest' ),
 338                                 $dbr->makeList( $where, LIST_OR ),
 339                                 __METHOD__
 340                         );
 341
 342                         # Fetch data and form into an associative array
 343                         # non-existent = broken
 344                         foreach ( $res as $s ) {
 345                                 $title = Title::makeTitle( $s->page_namespace, $s->page_title );
 346                                 $pdbk = $title->getPrefixedDBkey();
 347                                 $linkCache->addGoodLinkObjFromRow( $title, $s );
 348                                 $output->addLink( $title, $s->page_id );
 349                                 # @todo FIXME: Convoluted data flow
 350                                 # The redirect status and length is passed to getLinkColour via the LinkCache
 351                                 # Use formal parameters instead
 352                                 $colours[$pdbk] = Linker::getLinkColour( $title, $threshold );
 353                                 //add id to the extension todolist
 354                                 $linkcolour_ids[$s->page_id] = $pdbk;
 355                         }
 356                         unset( $res );
 357                 }
 358                 if ( count($linkcolour_ids) ) {
 359                         //pass an array of page_ids to an extension
 360                         wfRunHooks( 'GetLinkColours', array( $linkcolour_ids, &$colours ) );
 361                 }
 362                 wfProfileOut( __METHOD__.'-check' );
 363
 364                 # Do a second query for different language variants of links and categories
 365                 if($wgContLang->hasVariants()) {
 366                         $this->doVariants( $colours );
 367                 }
 368
 369                 # Construct search and replace arrays
 370                 wfProfileIn( __METHOD__.'-construct' );
 371                 $replacePairs = array();
 372                 foreach ( $this->internals as $ns => $entries ) {
 373                         foreach ( $entries as $index => $entry ) {
 374                                 $pdbk = $entry['pdbk'];
 375                                 $title = $entry['title'];
 376                                 $query = isset( $entry['query'] ) ? $entry['query'] : array();
 377                                 $key = "$ns:$index";
 378                                 $searchkey = "<!--LINK $key-->";
 379                                 $displayText = $entry['text'];
 380                                 if ( $displayText === '' ) {
 381                                         $displayText = null;
 382                                 }
 383                                 if ( !isset( $colours[$pdbk] ) ) {
 384                                         $colours[$pdbk] = 'new';
 385                                 }
 386                                 $attribs = array();
 387                                 if ( $colours[$pdbk] == 'new' ) {
 388                                         $linkCache->addBadLinkObj( $title );
 389                                         $output->addLink( $title, 0 );
 390                                         $type = array( 'broken' );
 391                                 } else {
 392                                         if ( $colours[$pdbk] != '' ) {
 393                                                 $attribs['class'] = $colours[$pdbk];
 394                                         }
 395                                         $type = array( 'known', 'noclasses' );
 396                                 }
 397                                 $replacePairs[$searchkey] = Linker::link( $title, $displayText,
 398                                                 $attribs, $query, $type );
 399                         }
 400                 }
 401                 $replacer = new HashtableReplacer( $replacePairs, 1 );
 402                 wfProfileOut( __METHOD__.'-construct' );
 403
 404                 # Do the thing
 405                 wfProfileIn( __METHOD__.'-replace' );
 406                 $text = preg_replace_callback(
 407                         '/(<!--LINK .*?-->)/',
 408                         $replacer->cb(),
 409                         $text);
 410
 411                 wfProfileOut( __METHOD__.'-replace' );
 412                 wfProfileOut( __METHOD__ );
 413         }
 414
 415         /**
 416          * Replace interwiki links
 417          */
 418         protected function replaceInterwiki( &$text ) {
 419                 if ( empty( $this->interwikis ) ) {
 420                         return;
 421                 }
 422
 423                 wfProfileIn( __METHOD__ );
 424                 # Make interwiki link HTML
 425                 $output = $this->parent->getOutput();
 426                 $replacePairs = array();
 427                 foreach( $this->interwikis as $key => $link ) {
 428                         $replacePairs[$key] = Linker::link( $link['title'], $link['text'] );
 429                         $output->addInterwikiLink( $link['title'] );
 430                 }
 431                 $replacer = new HashtableReplacer( $replacePairs, 1 );
 432
 433                 $text = preg_replace_callback(
 434                         '/<!--IWLINK (.*?)-->/',
 435                         $replacer->cb(),
 436                         $text );
 437                 wfProfileOut( __METHOD__ );
 438         }
 439
 440         /**
 441          * Modify $this->internals and $colours according to language variant linking rules
 442          */
 443         protected function doVariants( &$colours ) {
 444                 global $wgContLang;
 445                 $linkBatch = new LinkBatch();
 446                 $variantMap = array(); // maps $pdbkey_Variant => $keys (of link holders)
 447                 $output = $this->parent->getOutput();
 448                 $linkCache = LinkCache::singleton();
 449                 $threshold = $this->parent->getOptions()->getStubThreshold();
 450                 $titlesToBeConverted = '';
 451                 $titlesAttrs = array();
 452
 453                 // Concatenate titles to a single string, thus we only need auto convert the
 454                 // single string to all variants. This would improve parser's performance
 455                 // significantly.
 456                 foreach ( $this->internals as $ns => $entries ) {
 457                         foreach ( $entries as $index => $entry ) {
 458                                 $pdbk = $entry['pdbk'];
 459                                 // we only deal with new links (in its first query)
 460                                 if ( !isset( $colours[$pdbk] ) || $colours[$pdbk] === 'new' ) {
 461                                         $title = $entry['title'];
 462                                         $titleText = $title->getText();
 463                                         $titlesAttrs[] = array(
 464                                                 'ns' => $ns,
 465                                                 'key' => "$ns:$index",
 466                                                 'titleText' => $titleText,
 467                                         );
 468                                         // separate titles with \0 because it would never appears
 469                                         // in a valid title
 470                                         $titlesToBeConverted .= $titleText . "\0";
 471                                 }
 472                         }
 473                 }
 474
 475                 // Now do the conversion and explode string to text of titles
 476                 $titlesAllVariants = $wgContLang->autoConvertToAllVariants( rtrim( $titlesToBeConverted, "\0" ) );
 477                 $allVariantsName = array_keys( $titlesAllVariants );
 478                 foreach ( $titlesAllVariants as &$titlesVariant ) {
 479                         $titlesVariant = explode( "\0", $titlesVariant );
 480                 }
 481                 $l = count( $titlesAttrs );
 482                 // Then add variants of links to link batch
 483                 for ( $i = 0; $i < $l; $i ++ ) {
 484                         foreach ( $allVariantsName as $variantName ) {
 485                                 $textVariant = $titlesAllVariants[$variantName][$i];
 486                                 if ( $textVariant != $titlesAttrs[$i]['titleText'] ) {
 487                                         $variantTitle = Title::makeTitle( $titlesAttrs[$i]['ns'], $textVariant );
 488                                         if( is_null( $variantTitle ) ) {
 489                                                 continue;
 490                                         }
 491                                         $linkBatch->addObj( $variantTitle );
 492                                         $variantMap[$variantTitle->getPrefixedDBkey()][] = $titlesAttrs[$i]['key'];
 493                                 }
 494                         }
 495                 }
 496
 497                 // process categories, check if a category exists in some variant
 498                 $categoryMap = array(); // maps $category_variant => $category (dbkeys)
 499                 $varCategories = array(); // category replacements oldDBkey => newDBkey
 500                 foreach( $output->getCategoryLinks() as $category ){
 501                         $variants = $wgContLang->autoConvertToAllVariants( $category );
 502                         foreach($variants as $variant){
 503                                 if($variant != $category){
 504                                         $variantTitle = Title::newFromDBkey( Title::makeName(NS_CATEGORY,$variant) );
 505                                         if(is_null($variantTitle)) continue;
 506                                         $linkBatch->addObj( $variantTitle );
 507                                         $categoryMap[$variant] = $category;
 508                                 }
 509                         }
 510                 }
 511
 512
 513                 if(!$linkBatch->isEmpty()){
 514                         // construct query
 515                         $dbr = wfGetDB( DB_SLAVE );
 516                         $varRes = $dbr->select( 'page',
 517                                 array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect', 'page_len', 'page_latest' ),
 518                                 $linkBatch->constructSet( 'page', $dbr ),
 519                                 __METHOD__
 520                         );
 521
 522                         $linkcolour_ids = array();
 523
 524                         // for each found variants, figure out link holders and replace
 525                         foreach ( $varRes as $s ) {
 526
 527                                 $variantTitle = Title::makeTitle( $s->page_namespace, $s->page_title );
 528                                 $varPdbk = $variantTitle->getPrefixedDBkey();
 529                                 $vardbk = $variantTitle->getDBkey();
 530
 531                                 $holderKeys = array();
 532                                 if( isset( $variantMap[$varPdbk] ) ) {
 533                                         $holderKeys = $variantMap[$varPdbk];
 534                                         $linkCache->addGoodLinkObjFromRow( $variantTitle, $s );
 535                                         $output->addLink( $variantTitle, $s->page_id );
 536                                 }
 537
 538                                 // loop over link holders
 539                                 foreach( $holderKeys as $key ) {
 540                                         list( $ns, $index ) = explode( ':', $key, 2 );
 541                                         $entry =& $this->internals[$ns][$index];
 542                                         $pdbk = $entry['pdbk'];
 543
 544                                         if ( !isset( $colours[$pdbk] ) || $colours[$pdbk] === 'new' ) {
 545                                                 // found link in some of the variants, replace the link holder data
 546                                                 $entry['title'] = $variantTitle;
 547                                                 $entry['pdbk'] = $varPdbk;
 548
 549                                                 // set pdbk and colour
 550                                                 # @todo FIXME: Convoluted data flow
 551                                                 # The redirect status and length is passed to getLinkColour via the LinkCache
 552                                                 # Use formal parameters instead
 553                                                 $colours[$varPdbk] = Linker::getLinkColour( $variantTitle, $threshold );
 554                                                 $linkcolour_ids[$s->page_id] = $pdbk;
 555                                         }
 556                                 }
 557
 558                                 // check if the object is a variant of a category
 559                                 if(isset($categoryMap[$vardbk])){
 560                                         $oldkey = $categoryMap[$vardbk];
 561                                         if($oldkey != $vardbk)
 562                                                 $varCategories[$oldkey]=$vardbk;
 563                                 }
 564                         }
 565                         wfRunHooks( 'GetLinkColours', array( $linkcolour_ids, &$colours ) );
 566
 567                         // rebuild the categories in original order (if there are replacements)
 568                         if(count($varCategories)>0){
 569                                 $newCats = array();
 570                                 $originalCats = $output->getCategories();
 571                                 foreach($originalCats as $cat => $sortkey){
 572                                         // make the replacement
 573                                         if( array_key_exists($cat,$varCategories) )
 574                                                 $newCats[$varCategories[$cat]] = $sortkey;
 575                                         else $newCats[$cat] = $sortkey;
 576                                 }
 577                                 $output->setCategoryLinks($newCats);
 578                         }
 579                 }
 580         }
 581
 582         /**
 583          * Replace <!--LINK--> link placeholders with plain text of links
 584          * (not HTML-formatted).
 585          *
 586          * @param $text String
 587          * @return String
 588          */
 589         function replaceText( $text ) {
 590                 wfProfileIn( __METHOD__ );
 591
 592                 $text = preg_replace_callback(
 593                         '/<!--(LINK|IWLINK) (.*?)-->/',
 594                         array( &$this, 'replaceTextCallback' ),
 595                         $text );
 596
 597                 wfProfileOut( __METHOD__ );
 598                 return $text;
 599         }
 600
 601         /**
 602          * Callback for replaceText()
 603          *
 604          * @param $matches Array
 605          * @return string
 606          * @private
 607          */
 608         function replaceTextCallback( $matches ) {
 609                 $type = $matches[1];
 610                 $key  = $matches[2];
 611                 if( $type == 'LINK' ) {
 612                         list( $ns, $index ) = explode( ':', $key, 2 );
 613                         if( isset( $this->internals[$ns][$index]['text'] ) ) {
 614                                 return $this->internals[$ns][$index]['text'];
 615                         }
 616                 } elseif( $type == 'IWLINK' ) {
 617                         if( isset( $this->interwikis[$key]['text'] ) ) {
 618                                 return $this->interwikis[$key]['text'];
 619                         }
 620                 }
 621                 return $matches[0];
 622         }
 623 }