languages/LanguageConverter.php

   1 <?php
   2 /**
   3   * @package MediaWiki
   4   * @subpackage Language
   5   *
   6   * @author Zhengzhu Feng <zhengzhu@gmail.com>
   7   * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License
   8   */
   9
  10 class LanguageConverter {
  11         var $mPreferredVariant='';
  12         var $mMainLanguageCode;
  13         var $mVariants, $mVariantFallbacks;
  14         var $mTablesLoaded = false;
  15         var $mTables;
  16         var $mTitleDisplay='';
  17         var $mDoTitleConvert=true, $mDoContentConvert=true;
  18         var $mTitleFromFlag = false;
  19         var $mCacheKey;
  20         var $mLangObj;
  21         var $mMarkup;
  22         var $mFlags;
  23         var $mUcfirst = false;
  24         /**
  25      * Constructor
  26          *
  27      * @param string $maincode the main language code of this language
  28      * @param array $variants the supported variants of this language
  29      * @param array $variantfallback the fallback language of each variant
  30      * @param array $markup array defining the markup used for manual conversion
  31          * @param array $flags array defining the custom strings that maps to the flags
  32      * @access public
  33      */
  34         function __construct($langobj, $maincode,
  35                                                                 $variants=array(),
  36                                                                 $variantfallbacks=array(),
  37                                                                 $markup=array(),
  38                                                                 $flags = array()) {
  39                 $this->mLangObj = $langobj;
  40                 $this->mMainLanguageCode = $maincode;
  41                 $this->mVariants = $variants;
  42                 $this->mVariantFallbacks = $variantfallbacks;
  43                 $this->mCacheKey = wfMemcKey( 'conversiontables', $maincode );
  44                 $m = array('begin'=>'-{', 'flagsep'=>'|', 'codesep'=>':',
  45                                    'varsep'=>';', 'end'=>'}-');
  46                 $this->mMarkup = array_merge($m, $markup);
  47                 $f = array('A'=>'A', 'T'=>'T', 'R' => 'R');
  48                 $this->mFlags = array_merge($f, $flags);
  49         }
  50
  51         /**
  52      * @access public
  53      */
  54         function getVariants() {
  55                 return $this->mVariants;
  56         }
  57
  58         /**
  59          * in case some variant is not defined in the markup, we need
  60          * to have some fallback. for example, in zh, normally people
  61          * will define zh-cn and zh-tw, but less so for zh-sg or zh-hk.
  62          * when zh-sg is preferred but not defined, we will pick zh-cn
  63          * in this case. right now this is only used by zh.
  64          *
  65          * @param string $v the language code of the variant
  66          * @return string the code of the fallback language or false if there is no fallback
  67      * @private
  68         */
  69         function getVariantFallback($v) {
  70                 return $this->mVariantFallbacks[$v];
  71         }
  72
  73
  74         /**
  75          * get preferred language variants.
  76          * @param boolean $fromUser Get it from $wgUser's preferences
  77      * @return string the preferred language code
  78      * @access public
  79         */
  80         function getPreferredVariant( $fromUser = true ) {
  81                 global $wgUser, $wgRequest, $wgVariantArticlePath, $wgDefaultLanguageVariant;
  82
  83                 if($this->mPreferredVariant)
  84                         return $this->mPreferredVariant;
  85
  86                 // see if the preference is set in the request
  87                 $req = $wgRequest->getText( 'variant' );
  88                 if( in_array( $req, $this->mVariants ) ) {
  89                         $this->mPreferredVariant = $req;
  90                         return $req;
  91                 }
  92
  93                 // check the syntax /code/ArticleTitle
  94                 if($wgVariantArticlePath!=false && isset($_SERVER['SCRIPT_NAME'])){
  95                         // Note: SCRIPT_NAME probably won't hold the correct value if PHP is run as CGI
  96                         // (it will hold path to php.cgi binary), and might not exist on some very old PHP installations
  97                         $scriptBase = basename( $_SERVER['SCRIPT_NAME'] );
  98                         if(in_array($scriptBase,$this->mVariants)){
  99                                 $this->mPreferredVariant = $scriptBase;
 100                                 return $this->mPreferredVariant;
 101                         }
 102                 }
 103
 104                 // get language variant preference from logged in users
 105                 // Don't call this on stub objects because that causes infinite
 106                 // recursion during initialisation
 107                 if( $fromUser && $wgUser->isLoggedIn() )  {
 108                         $this->mPreferredVariant = $wgUser->getOption('variant');
 109                         return $this->mPreferredVariant;
 110                 }
 111
 112                 // see if default variant is globaly set
 113                 if($wgDefaultLanguageVariant != false  &&  in_array( $wgDefaultLanguageVariant, $this->mVariants )){
 114                         $this->mPreferredVariant = $wgDefaultLanguageVariant;
 115                         return $this->mPreferredVariant;
 116                 }
 117
 118                 # FIXME rewrite code for parsing http header. The current code
 119                 # is written specific for detecting zh- variants
 120                 if( !$this->mPreferredVariant ) {
 121                         // see if some supported language variant is set in the
 122                         // http header, but we don't set the mPreferredVariant
 123                         // variable in case this is called before the user's
 124                         // preference is loaded
 125                         $pv=$this->mMainLanguageCode;
 126                         if(array_key_exists('HTTP_ACCEPT_LANGUAGE', $_SERVER)) {
 127                                 $header = str_replace( '_', '-', strtolower($_SERVER["HTTP_ACCEPT_LANGUAGE"]));
 128                                 $zh = strstr($header, $pv.'-');
 129                                 if($zh) {
 130                                         $pv = substr($zh,0,5);
 131                                 }
 132                         }
 133                         // don't try to return bad variant
 134                         if(in_array( $pv, $this->mVariants ))
 135                                 return $pv;
 136                 }
 137
 138                 return $this->mMainLanguageCode;
 139
 140         }
 141
 142         /**
 143      * dictionary-based conversion
 144      *
 145      * @param string $text the text to be converted
 146      * @param string $toVariant the target language code
 147      * @return string the converted text
 148      * @private
 149      */
 150         function autoConvert($text, $toVariant=false) {
 151                 $fname="LanguageConverter::autoConvert";
 152
 153                 wfProfileIn( $fname );
 154
 155                 if(!$this->mTablesLoaded)
 156                         $this->loadTables();
 157
 158                 if(!$toVariant)
 159                         $toVariant = $this->getPreferredVariant();
 160                 if(!in_array($toVariant, $this->mVariants))
 161                         return $text;
 162
 163                 /* we convert everything except:
 164                    1. html markups (anything between < and >)
 165                    2. html entities
 166                    3. place holders created by the parser
 167                 */
 168                 global $wgParser;
 169                 if (isset($wgParser))
 170                         $marker = '|' . $wgParser->UniqPrefix() . '[\-a-zA-Z0-9]+';
 171                 else
 172                         $marker = "";
 173
 174                 // this one is needed when the text is inside an html markup
 175                 $htmlfix = '|<[^>]+$|^[^<>]*>';
 176
 177                 // disable convert to variants between <code></code> tags
 178                 $codefix = '<code>.+?<\/code>|';
 179                 // disable convertsion of <script type="text/javascript"> ... </script>
 180                 $scriptfix = '<script.*?>.*?<\/script>|';
 181
 182                 $reg = '/'.$codefix . $scriptfix . '<[^>]+>|&[a-zA-Z#][a-z0-9]+;' . $marker . $htmlfix . '/s';
 183
 184                 $matches = preg_split($reg, $text, -1, PREG_SPLIT_OFFSET_CAPTURE);
 185
 186                 $m = array_shift($matches);
 187
 188                 $ret = $this->translate($m[0], $toVariant);
 189                 $mstart = $m[1]+strlen($m[0]);
 190                 foreach($matches as $m) {
 191                         $ret .= substr($text, $mstart, $m[1]-$mstart);
 192                         $ret .= $this->translate($m[0], $toVariant);
 193                         $mstart = $m[1] + strlen($m[0]);
 194                 }
 195                 wfProfileOut( $fname );
 196                 return $ret;
 197         }
 198
 199         /**
 200          * Translate a string to a variant
 201          * Doesn't process markup or do any of that other stuff, for that use convert()
 202          *
 203          * @param string $text Text to convert
 204          * @param string $variant Variant language code
 205          * @return string Translated text
 206          */
 207         function translate( $text, $variant ) {
 208                 wfProfileIn( __METHOD__ );
 209                 if( !$this->mTablesLoaded )
 210                         $this->loadTables();
 211                 $text = $this->mTables[$variant]->replace( $text );
 212                 wfProfileOut( __METHOD__ );
 213                 return $text;
 214         }
 215
 216         /**
 217      * convert text to all supported variants
 218      *
 219      * @param string $text the text to be converted
 220      * @return array of string
 221      * @public
 222      */
 223         function autoConvertToAllVariants($text) {
 224                 $fname="LanguageConverter::autoConvertToAllVariants";
 225                 wfProfileIn( $fname );
 226                 if( !$this->mTablesLoaded )
 227                         $this->loadTables();
 228
 229                 $ret = array();
 230                 foreach($this->mVariants as $variant) {
 231                         $ret[$variant] = $this->translate($text, $variant);
 232                 }
 233
 234                 wfProfileOut( $fname );
 235                 return $ret;
 236         }
 237
 238         /**
 239      * convert link text to all supported variants
 240      *
 241      * @param string $text the text to be converted
 242      * @return array of string
 243      * @public
 244      */
 245         function convertLinkToAllVariants($text) {
 246                 if( !$this->mTablesLoaded )
 247                         $this->loadTables();
 248
 249                 $ret = array();
 250                 $tarray = explode($this->mMarkup['begin'], $text);
 251                 $tfirst = array_shift($tarray);
 252
 253                 foreach($this->mVariants as $variant)
 254                         $ret[$variant] = $this->translate($tfirst,$variant);
 255
 256                 foreach($tarray as $txt) {
 257                         $marked = explode($this->mMarkup['end'], $txt, 2);
 258
 259                         foreach($this->mVariants as $variant){
 260                                 $ret[$variant] .= $this->mMarkup['begin'].$marked[0].$this->mMarkup['end'];
 261                                 if(array_key_exists(1, $marked))
 262                                         $ret[$variant] .= $this->translate($marked[1],$variant);
 263                         }
 264
 265                 }
 266
 267                 return $ret;
 268         }
 269
 270
 271         /**
 272          * Convert text using a parser object for context
 273          */
 274         function parserConvert( $text, &$parser ) {
 275                 global $wgDisableLangConversion;
 276                 /* don't do anything if this is the conversion table */
 277                 if ( $parser->getTitle()->getNamespace() == NS_MEDIAWIKI &&
 278                                  strpos($parser->mTitle->getText(), "Conversiontable") !== false )
 279                 {
 280                         return $text;
 281                 }
 282
 283                 if($wgDisableLangConversion)
 284                         return $text;
 285
 286                 $text = $this->convert( $text );
 287                 $parser->mOutput->setTitleText( $this->mTitleDisplay );
 288                 return $text;
 289         }
 290
 291         /**
 292          *  Parse flags with syntax -{FLAG| ... }-
 293          *
 294          */
 295         function parseFlags($marked){
 296                         $flags = array();
 297
 298                         // process flag only if the flag is valid
 299                         if(strlen($marked) < 2 || !(in_array($marked[0],$this->mFlags) && $marked[1]=='|' ) )
 300                                 return array($marked,array());
 301
 302                         $tt = explode($this->mMarkup['flagsep'], $marked, 2);
 303
 304                         if(sizeof($tt) == 2) {
 305                                 $f = explode($this->mMarkup['varsep'], $tt[0]);
 306                                 foreach($f as $ff) {
 307                                         $ff = trim($ff);
 308                                         if(array_key_exists($ff, $this->mFlags) &&
 309                                                 !array_key_exists($this->mFlags[$ff], $flags))
 310                                                 $flags[] = $this->mFlags[$ff];
 311                                 }
 312                                 $rules = $tt[1];
 313                         }
 314                         else
 315                                 $rules = $marked;
 316
 317                         if( !in_array('R',$flags) ){
 318                                 //FIXME: may cause trouble here...
 319                                 //strip &nbsp; since it interferes with the parsing, plus,
 320                                 //all spaces should be stripped in this tag anyway.
 321                                 $rules = str_replace('&nbsp;', '', $rules);
 322                         }
 323
 324                         return array($rules,$flags);
 325         }
 326
 327         /**
 328          * convert text to different variants of a language. the automatic
 329          * conversion is done in autoConvert(). here we parse the text
 330          * marked with -{}-, which specifies special conversions of the
 331          * text that can not be accomplished in autoConvert()
 332          *
 333          * syntax of the markup:
 334          * -{code1:text1;code2:text2;...}-  or
 335          * -{text}- in which case no conversion should take place for text
 336      *
 337      * @param string $text text to be converted
 338      * @param bool $isTitle whether this conversion is for the article title
 339      * @return string converted text
 340      * @access public
 341      */
 342         function convert( $text , $isTitle=false) {
 343                 $mw =& MagicWord::get( 'notitleconvert'   );
 344                 if( $mw->matchAndRemove( $text ) )
 345                         $this->mDoTitleConvert = false;
 346
 347                 $mw =& MagicWord::get( 'nocontentconvert'   );
 348                 if( $mw->matchAndRemove( $text ) ) {
 349                         $this->mDoContentConvert = false;
 350                 }
 351
 352                 // no conversion if redirecting
 353                 $mw =& MagicWord::get( 'redirect'   );
 354                 if( $mw->matchStart( $text ))
 355                         return $text;
 356
 357                 if( $isTitle ) {
 358
 359                         // use the title from the T flag if any
 360                         if($this->mTitleFromFlag){
 361                                 $this->mTitleFromFlag = false;
 362                                 return $this->mTitleDisplay;
 363                         }
 364
 365                         // check for __NOTC__ tag
 366                         if( !$this->mDoTitleConvert ) {
 367                                 $this->mTitleDisplay = $text;
 368                                 return $text;
 369                         }
 370
 371                         global $wgRequest;
 372                         $isredir = $wgRequest->getText( 'redirect', 'yes' );
 373                         $action = $wgRequest->getText( 'action' );
 374                         if ( $isredir == 'no' || $action == 'edit' ) {
 375                                 return $text;
 376                         }
 377                         else {
 378                                 $this->mTitleDisplay = $this->convert($text);
 379                                 return $this->mTitleDisplay;
 380                         }
 381                 }
 382
 383                 $plang = $this->getPreferredVariant();
 384                 if( isset( $this->mVariantFallbacks[$plang] ) ) {
 385                         $fallback = $this->mVariantFallbacks[$plang];
 386                 } else {
 387                         $fallback = $this->mMainLanguageCode;
 388                 }
 389
 390                 $tarray = explode($this->mMarkup['begin'], $text);
 391                 $tfirst = array_shift($tarray);
 392                 if($this->mDoContentConvert)
 393                         $text = $this->autoConvert($tfirst);
 394                 else
 395                         $text = $tfirst;
 396                 foreach($tarray as $txt) {
 397                         $marked = explode($this->mMarkup['end'], $txt, 2);
 398
 399                         // strip the flags from syntax like -{T| ... }-
 400                         list($rules,$flags) = $this->parseFlags($marked[0]);
 401
 402                         // proces R flag: output raw content of -{ ... }-
 403                         if( in_array('R',$flags) ){
 404                                 $disp = $rules;
 405                         } else if( $this->mDoContentConvert){
 406                                 // parse the contents -{ ... }-
 407                                 $carray = $this->parseManualRule($rules, $flags);
 408
 409                                 $disp = '';
 410                                 if(array_key_exists($plang, $carray)) {
 411                                         $disp = $carray[$plang];
 412                                 } else if(array_key_exists($fallback, $carray)) {
 413                                         $disp = $carray[$fallback];
 414                                 }
 415                         } else{
 416                                 // if we don't do content convert, still strip the -{}- tags
 417                                 $disp = $rules;
 418                                 $flags = array();
 419                         }
 420
 421                         if($disp) {
 422                                 // use syntax -{T|zh:TitleZh;zh-tw:TitleTw}- for custom conversion in title
 423                                 if(in_array('T',  $flags)){
 424                                         $this->mTitleFromFlag = true;
 425                                         $this->mTitleDisplay = $disp;
 426                                 }
 427                                 else
 428                                         $text .= $disp;
 429
 430                                 // use syntax -{A|zh:WordZh;zh-tw:WordTw}- to introduce a custom mapping between
 431                                 // words WordZh and WordTw in the whole text
 432                                 if(in_array('A', $flags)) {
 433
 434                                         /* fill in the missing variants, if any,
 435                                             with fallbacks */
 436                                         foreach($this->mVariants as $v) {
 437                                                 if(!array_key_exists($v, $carray)) {
 438                                                         $vf = $this->getVariantFallback($v);
 439                                                         if(array_key_exists($vf, $carray))
 440                                                                 $carray[$v] = $carray[$vf];
 441                                                 }
 442                                         }
 443
 444                                         foreach($this->mVariants as $vfrom) {
 445                                                 if(!array_key_exists($vfrom, $carray))
 446                                                         continue;
 447                                                 foreach($this->mVariants as $vto) {
 448                                                         if($vfrom == $vto)
 449                                                                 continue;
 450                                                         if(!array_key_exists($vto, $carray))
 451                                                                 continue;
 452                                                         $this->mTables[$vto]->setPair($carray[$vfrom], $carray[$vto]);
 453                                                 }
 454                                         }
 455                                 }
 456                         }
 457                         else {
 458                                 $text .= $marked[0];
 459                         }
 460                         if(array_key_exists(1, $marked)){
 461                                 if( $this->mDoContentConvert )
 462                                         $text .= $this->autoConvert($marked[1]);
 463                                 else
 464                                         $text .= $marked[1];
 465                         }
 466                 }
 467
 468                 return $text;
 469         }
 470
 471         /**
 472          * parse the manually marked conversion rule
 473          * @param string $rule the text of the rule
 474          * @return array of the translation in each variant
 475          * @private
 476          */
 477         function parseManualRule($rules, $flags=array()) {
 478
 479                 $choice = explode($this->mMarkup['varsep'], $rules);
 480                 $carray = array();
 481                 if(sizeof($choice) == 1) {
 482                         /* a single choice */
 483                         foreach($this->mVariants as $v)
 484                                 $carray[$v] = $choice[0];
 485                 }
 486                 else {
 487                         foreach($choice as $c) {
 488                                 $v = explode($this->mMarkup['codesep'], $c);
 489                                 if(sizeof($v) != 2) // syntax error, skip
 490                                         continue;
 491                                 $carray[trim($v[0])] = trim($v[1]);
 492                         }
 493                 }
 494                 return $carray;
 495         }
 496
 497         /**
 498          * if a language supports multiple variants, it is
 499          * possible that non-existing link in one variant
 500          * actually exists in another variant. this function
 501          * tries to find it. See e.g. LanguageZh.php
 502          *
 503          * @param string $link the name of the link
 504          * @param mixed $nt the title object of the link
 505          * @return null the input parameters may be modified upon return
 506      * @access public
 507          */
 508         function findVariantLink( &$link, &$nt ) {
 509                 global $wgDisableLangConversion;
 510                 $linkBatch = new LinkBatch();
 511
 512                 $ns=NS_MAIN;
 513
 514                 if(is_object($nt))
 515                         $ns = $nt->getNamespace();
 516
 517                 $variants = $this->autoConvertToAllVariants($link);
 518                 if($variants == false) //give up
 519                         return;
 520
 521                 $titles = array();
 522
 523                 foreach( $variants as $v ) {
 524                         if($v != $link){
 525                                 $varnt = Title::newFromText( $v, $ns );
 526                                 if(!is_null($varnt)){
 527                                         $linkBatch->addObj($varnt);
 528                                         $titles[]=$varnt;
 529                                 }
 530                         }
 531                 }
 532
 533                 // fetch all variants in single query
 534                 $linkBatch->execute();
 535
 536                 foreach( $titles as $varnt ) {
 537                         if( $varnt->getArticleID() > 0 ) {
 538                                 $nt = $varnt;
 539                                 if( !$wgDisableLangConversion )
 540                                         $link = $v;
 541                                 break;
 542                         }
 543                 }
 544         }
 545
 546     /**
 547      * returns language specific hash options
 548      *
 549      * @access public
 550      */
 551         function getExtraHashOptions() {
 552                 $variant = $this->getPreferredVariant();
 553                 return '!' . $variant ;
 554         }
 555
 556     /**
 557      * get title text as defined in the body of the article text
 558      *
 559      * @access public
 560      */
 561         function getParsedTitle() {
 562                 return $this->mTitleDisplay;
 563         }
 564
 565         /**
 566      * a write lock to the cache
 567      *
 568      * @private
 569      */
 570         function lockCache() {
 571                 global $wgMemc;
 572                 $success = false;
 573                 for($i=0; $i<30; $i++) {
 574                         if($success = $wgMemc->add($this->mCacheKey . "lock", 1, 10))
 575                                 break;
 576                         sleep(1);
 577                 }
 578                 return $success;
 579         }
 580
 581         /**
 582      * unlock cache
 583      *
 584      * @private
 585      */
 586         function unlockCache() {
 587                 global $wgMemc;
 588                 $wgMemc->delete($this->mCacheKey . "lock");
 589         }
 590
 591
 592         /**
 593      * Load default conversion tables
 594      * This method must be implemented in derived class
 595      *
 596      * @private
 597      */
 598         function loadDefaultTables() {
 599                 $name = get_class($this);
 600                 wfDie("Must implement loadDefaultTables() method in class $name");
 601         }
 602
 603         /**
 604      * load conversion tables either from the cache or the disk
 605      * @private
 606      */
 607         function loadTables($fromcache=true) {
 608                 global $wgMemc;
 609                 if( $this->mTablesLoaded )
 610                         return;
 611                 wfProfileIn( __METHOD__ );
 612                 $this->mTablesLoaded = true;
 613                 $this->mTables = false;
 614                 if($fromcache) {
 615                         wfProfileIn( __METHOD__.'-cache' );
 616                         $this->mTables = $wgMemc->get( $this->mCacheKey );
 617                         wfProfileOut( __METHOD__.'-cache' );
 618                 }
 619                 if ( !$this->mTables || !isset( $this->mTables['VERSION 2'] ) ) {
 620                         wfProfileIn( __METHOD__.'-recache' );
 621                         // not in cache, or we need a fresh reload.
 622                         // we will first load the default tables
 623                         // then update them using things in MediaWiki:Zhconversiontable/*
 624                         $this->loadDefaultTables();
 625                         foreach($this->mVariants as $var) {
 626                                 $cached = $this->parseCachedTable($var);
 627                                 $this->mTables[$var]->mergeArray($cached);
 628                         }
 629
 630                         $this->postLoadTables();
 631                         $this->mTables['VERSION 2'] = true;
 632
 633                         if($this->lockCache()) {
 634                                 $wgMemc->set($this->mCacheKey, $this->mTables, 43200);
 635                                 $this->unlockCache();
 636                         }
 637                         wfProfileOut( __METHOD__.'-recache' );
 638                 }
 639                 wfProfileOut( __METHOD__ );
 640         }
 641
 642     /**
 643      * Hook for post processig after conversion tables are loaded
 644      *
 645      */
 646         function postLoadTables() {}
 647
 648     /**
 649      * Reload the conversion tables
 650      *
 651      * @private
 652      */
 653         function reloadTables() {
 654                 if($this->mTables)
 655                         unset($this->mTables);
 656                 $this->mTablesLoaded = false;
 657                 $this->loadTables(false);
 658         }
 659
 660
 661         /**
 662      * parse the conversion table stored in the cache
 663      *
 664      * the tables should be in blocks of the following form:
 665
 666      *          -{
 667      *                  word => word ;
 668      *                  word => word ;
 669      *                  ...
 670      *          }-
 671      *
 672      *  to make the tables more manageable, subpages are allowed
 673      *  and will be parsed recursively if $recursive=true
 674      *
 675      * @private
 676          */
 677         function parseCachedTable($code, $subpage='', $recursive=true) {
 678                 global $wgMessageCache;
 679                 static $parsed = array();
 680
 681                 if(!is_object($wgMessageCache))
 682                         return array();
 683
 684                 $key = 'Conversiontable/'.$code;
 685                 if($subpage)
 686                         $key .= '/' . $subpage;
 687
 688                 if(array_key_exists($key, $parsed))
 689                         return array();
 690
 691
 692                 $txt = $wgMessageCache->get( $key, true, true, true );
 693
 694                 // get all subpage links of the form
 695                 // [[MediaWiki:conversiontable/zh-xx/...|...]]
 696                 $linkhead = $this->mLangObj->getNsText(NS_MEDIAWIKI) . ':Conversiontable';
 697                 $subs = explode('[[', $txt);
 698                 $sublinks = array();
 699                 foreach( $subs as $sub ) {
 700                         $link = explode(']]', $sub, 2);
 701                         if(count($link) != 2)
 702                                 continue;
 703                         $b = explode('|', $link[0]);
 704                         $b = explode('/', trim($b[0]), 3);
 705                         if(count($b)==3)
 706                                 $sublink = $b[2];
 707                         else
 708                                 $sublink = '';
 709
 710                         if($b[0] == $linkhead && $b[1] == $code) {
 711                                 $sublinks[] = $sublink;
 712                         }
 713                 }
 714
 715
 716                 // parse the mappings in this page
 717                 $blocks = explode($this->mMarkup['begin'], $txt);
 718                 array_shift($blocks);
 719                 $ret = array();
 720                 foreach($blocks as $block) {
 721                         $mappings = explode($this->mMarkup['end'], $block, 2);
 722                         $stripped = str_replace(array("'", '"', '*','#'), '', $mappings[0]);
 723                         $table = explode( ';', $stripped );
 724                         foreach( $table as $t ) {
 725                                 $m = explode( '=>', $t );
 726                                 if( count( $m ) != 2)
 727                                         continue;
 728                                 // trim any trailling comments starting with '//'
 729                                 $tt = explode('//', $m[1], 2);
 730                                 $ret[trim($m[0])] = trim($tt[0]);
 731                         }
 732                 }
 733                 $parsed[$key] = true;
 734
 735
 736                 // recursively parse the subpages
 737                 if($recursive) {
 738                         foreach($sublinks as $link) {
 739                                 $s = $this->parseCachedTable($code, $link, $recursive);
 740                                 $ret = array_merge($ret, $s);
 741                         }
 742                 }
 743
 744                 if ($this->mUcfirst) {
 745                         foreach ($ret as $k => $v) {
 746                                 $ret[Language::ucfirst($k)] = Language::ucfirst($v);
 747                         }
 748                 }
 749                 return $ret;
 750         }
 751
 752         /**
 753          * Enclose a string with the "no conversion" tag. This is used by
 754          * various functions in the Parser
 755          *
 756          * @param string $text text to be tagged for no conversion
 757          * @return string the tagged text
 758         */
 759         function markNoConversion($text, $noParse=false) {
 760                 # don't mark if already marked
 761                 if(strpos($text, $this->mMarkup['begin']) ||
 762                    strpos($text, $this->mMarkup['end']))
 763                         return $text;
 764
 765                 $ret = $this->mMarkup['begin'] . $text . $this->mMarkup['end'];
 766                 return $ret;
 767         }
 768
 769         /**
 770          * convert the sorting key for category links. this should make different
 771          * keys that are variants of each other map to the same key
 772         */
 773         function convertCategoryKey( $key ) {
 774                 return $key;
 775         }
 776         /**
 777      * hook to refresh the cache of conversion tables when
 778      * MediaWiki:conversiontable* is updated
 779      * @private
 780         */
 781         function OnArticleSaveComplete($article, $user, $text, $summary, $isminor, $iswatch, $section) {
 782                 $titleobj = $article->getTitle();
 783                 if($titleobj->getNamespace() == NS_MEDIAWIKI) {
 784             /*
 785                         global $wgContLang; // should be an LanguageZh.
 786                         if(get_class($wgContLang) != 'languagezh')
 787                                 return true;
 788             */
 789                         $title = $titleobj->getDBkey();
 790                         $t = explode('/', $title, 3);
 791                         $c = count($t);
 792                         if( $c > 1 && $t[0] == 'Conversiontable' ) {
 793                                 if(in_array($t[1], $this->mVariants)) {
 794                                         $this->reloadTables();
 795                                 }
 796                         }
 797                 }
 798                 return true;
 799         }
 800
 801         /**
 802          * Armour rendered math against conversion
 803          * Wrap math into rawoutput -{R| math }- syntax
 804          */
 805         function armourMath($text){
 806                 $ret = $this->mMarkup['begin'] . 'R|' . $text . $this->mMarkup['end'];
 807                 return $ret;
 808         }
 809
 810
 811 }
 812
 813 ?>