languages/LanguageConverter.php

   1 <?php
   2 /**
   3  * Contains the LanguageConverter class and ConverterRule class
   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 Language
  22  */
  23
  24 /**
  25  * Base class for language conversion.
  26  * @ingroup Language
  27  *
  28  * @author Zhengzhu Feng <zhengzhu@gmail.com>
  29  * @maintainers fdcn <fdcn64@gmail.com>, shinjiman <shinjiman@gmail.com>, PhiLiP <philip.npc@gmail.com>
  30  */
  31 class LanguageConverter {
  32         var $mMainLanguageCode;
  33         var $mVariants, $mVariantFallbacks, $mVariantNames;
  34         var $mTablesLoaded = false;
  35         var $mTables;
  36         // 'bidirectional' 'unidirectional' 'disable' for each variant
  37         var $mManualLevel;
  38
  39         /**
  40          * @var String: memcached key name
  41          */
  42         var $mCacheKey;
  43
  44         var $mLangObj;
  45         var $mFlags;
  46         var $mDescCodeSep = ':', $mDescVarSep = ';';
  47         var $mUcfirst = false;
  48         var $mConvRuleTitle = false;
  49         var $mURLVariant;
  50         var $mUserVariant;
  51         var $mHeaderVariant;
  52         var $mMaxDepth = 10;
  53         var $mVarSeparatorPattern;
  54
  55         const CACHE_VERSION_KEY = 'VERSION 6';
  56
  57         /**
  58          * Constructor
  59          *
  60          * @param $langobj Language: the Language Object
  61          * @param $maincode String: the main language code of this language
  62          * @param $variants Array: the supported variants of this language
  63          * @param $variantfallbacks Array: the fallback language of each variant
  64          * @param $flags Array: defining the custom strings that maps to the flags
  65          * @param $manualLevel Array: limit for supported variants
  66          */
  67         public function __construct( $langobj, $maincode, $variants = array(),
  68                                                                 $variantfallbacks = array(), $flags = array(),
  69                                                                 $manualLevel = array() ) {
  70                 global $wgDisabledVariants;
  71                 $this->mLangObj = $langobj;
  72                 $this->mMainLanguageCode = $maincode;
  73                 $this->mVariants = array_diff( $variants, $wgDisabledVariants );
  74                 $this->mVariantFallbacks = $variantfallbacks;
  75                 $this->mVariantNames = Language::getLanguageNames();
  76                 $this->mCacheKey = wfMemcKey( 'conversiontables', $maincode );
  77                 $defaultflags = array(
  78                         // 'S' show converted text
  79                         // '+' add rules for alltext
  80                         // 'E' the gave flags is error
  81                         // these flags above are reserved for program
  82                         'A' => 'A',       // add rule for convert code (all text convert)
  83                         'T' => 'T',       // title convert
  84                         'R' => 'R',       // raw content
  85                         'D' => 'D',       // convert description (subclass implement)
  86                         '-' => '-',       // remove convert (not implement)
  87                         'H' => 'H',       // add rule for convert code
  88                                                   // (but no display in placed code)
  89                         'N' => 'N'        // current variant name
  90                 );
  91                 $this->mFlags = array_merge( $defaultflags, $flags );
  92                 foreach ( $this->mVariants as $v ) {
  93                         if ( array_key_exists( $v, $manualLevel ) ) {
  94                                 $this->mManualLevel[$v] = $manualLevel[$v];
  95                         } else {
  96                                 $this->mManualLevel[$v] = 'bidirectional';
  97                         }
  98                         $this->mFlags[$v] = $v;
  99                 }
 100         }
 101
 102         /**
 103          * Get all valid variants.
 104          * Call this instead of using $this->mVariants directly.
 105          *
 106          * @return Array: contains all valid variants
 107          */
 108         public function getVariants() {
 109                 return $this->mVariants;
 110         }
 111
 112         /**
 113          * In case some variant is not defined in the markup, we need
 114          * to have some fallback. For example, in zh, normally people
 115          * will define zh-hans and zh-hant, but less so for zh-sg or zh-hk.
 116          * when zh-sg is preferred but not defined, we will pick zh-hans
 117          * in this case. Right now this is only used by zh.
 118          *
 119          * @param $variant String: the language code of the variant
 120          * @return String: The code of the fallback language or the
 121          *                               main code if there is no fallback
 122          */
 123         public function getVariantFallbacks( $variant ) {
 124                 if ( isset( $this->mVariantFallbacks[$variant] ) ) {
 125                         return $this->mVariantFallbacks[$variant];
 126                 }
 127                 return $this->mMainLanguageCode;
 128         }
 129
 130         /**
 131          * Get the title produced by the conversion rule.
 132          * @return String: The converted title text
 133          */
 134         public function getConvRuleTitle() {
 135                 return $this->mConvRuleTitle;
 136         }
 137
 138         /**
 139          * Get preferred language variant.
 140          * @return String: the preferred language code
 141          */
 142         public function getPreferredVariant() {
 143                 global $wgDefaultLanguageVariant, $wgUser;
 144
 145                 $req = $this->getURLVariant();
 146
 147                 if ( $wgUser->isLoggedIn() && !$req ) {
 148                         $req = $this->getUserVariant();
 149                 } elseif ( !$req ) {
 150                         $req = $this->getHeaderVariant();
 151                 }
 152
 153                 if ( $wgDefaultLanguageVariant && !$req ) {
 154                         $req = $this->validateVariant( $wgDefaultLanguageVariant );
 155                 }
 156
 157                 // This function, unlike the other get*Variant functions, is
 158                 // not memoized (i.e. there return value is not cached) since
 159                 // new information might appear during processing after this
 160                 // is first called.
 161                 if ( $req ) {
 162                         return $req;
 163                 }
 164                 return $this->mMainLanguageCode;
 165         }
 166
 167         /**
 168          * Get default variant.
 169          * This function would not be affected by user's settings or headers
 170          * @return String: the default variant code
 171          */
 172         public function getDefaultVariant() {
 173                 global $wgDefaultLanguageVariant;
 174
 175                 $req = $this->getURLVariant();
 176
 177                 if ( $wgDefaultLanguageVariant && !$req ) {
 178                         $req = $this->validateVariant( $wgDefaultLanguageVariant );
 179                 }
 180
 181                 if ( $req ) {
 182                         return $req;
 183                 }
 184                 return $this->mMainLanguageCode;
 185         }
 186
 187         /**
 188          * Validate the variant
 189          * @param $variant String: the variant to validate
 190          * @return Mixed: returns the variant if it is valid, null otherwise
 191          */
 192         protected function validateVariant( $variant = null ) {
 193                 if ( $variant !== null && in_array( $variant, $this->mVariants ) ) {
 194                         return $variant;
 195                 }
 196                 return null;
 197         }
 198
 199         /**
 200          * Get the variant specified in the URL
 201          *
 202          * @return Mixed: variant if one found, false otherwise.
 203          */
 204         public function getURLVariant() {
 205                 global $wgRequest;
 206
 207                 if ( $this->mURLVariant ) {
 208                         return $this->mURLVariant;
 209                 }
 210
 211                 // see if the preference is set in the request
 212                 $ret = $wgRequest->getText( 'variant' );
 213
 214                 if ( !$ret ) {
 215                         $ret = $wgRequest->getVal( 'uselang' );
 216                 }
 217
 218                 return $this->mURLVariant = $this->validateVariant( $ret );
 219         }
 220
 221         /**
 222          * Determine if the user has a variant set.
 223          *
 224          * @return Mixed: variant if one found, false otherwise.
 225          */
 226         protected function getUserVariant() {
 227                 global $wgUser;
 228
 229                 // memoizing this function wreaks havoc on parserTest.php
 230                 /*
 231                 if ( $this->mUserVariant ) {
 232                         return $this->mUserVariant;
 233                 }
 234                 */
 235
 236                 // Get language variant preference from logged in users
 237                 // Don't call this on stub objects because that causes infinite
 238                 // recursion during initialisation
 239                 if ( $wgUser->isLoggedIn() )  {
 240                         $ret = $wgUser->getOption( 'variant' );
 241                 } else {
 242                         // figure out user lang without constructing wgLang to avoid
 243                         // infinite recursion
 244                         $ret = $wgUser->getOption( 'language' );
 245                 }
 246
 247                 return $this->mUserVariant = $this->validateVariant( $ret );
 248         }
 249
 250         /**
 251          * Determine the language variant from the Accept-Language header.
 252          *
 253          * @return Mixed: variant if one found, false otherwise.
 254          */
 255         protected function getHeaderVariant() {
 256                 global $wgRequest;
 257
 258                 if ( $this->mHeaderVariant ) {
 259                         return $this->mHeaderVariant;
 260                 }
 261
 262                 // see if some supported language variant is set in the
 263                 // HTTP header.
 264                 $languages = array_keys( $wgRequest->getAcceptLang() );
 265                 if ( empty( $languages ) ) {
 266                         return null;
 267                 }
 268
 269                 $fallbackLanguages = array();
 270                 foreach ( $languages as $language ) {
 271                         $this->mHeaderVariant = $this->validateVariant( $language );
 272                         if ( $this->mHeaderVariant ) {
 273                                 break;
 274                         }
 275
 276                         // To see if there are fallbacks of current language.
 277                         // We record these fallback variants, and process
 278                         // them later.
 279                         $fallbacks = $this->getVariantFallbacks( $language );
 280                         if ( is_string( $fallbacks ) ) {
 281                                 $fallbackLanguages[] = $fallbacks;
 282                         } elseif ( is_array( $fallbacks ) ) {
 283                                 $fallbackLanguages =
 284                                         array_merge( $fallbackLanguages, $fallbacks );
 285                         }
 286                 }
 287
 288                 if ( !$this->mHeaderVariant ) {
 289                         // process fallback languages now
 290                         $fallback_languages = array_unique( $fallbackLanguages );
 291                         foreach ( $fallback_languages as $language ) {
 292                                 $this->mHeaderVariant = $this->validateVariant( $language );
 293                                 if ( $this->mHeaderVariant ) {
 294                                         break;
 295                                 }
 296                         }
 297                 }
 298
 299                 return $this->mHeaderVariant;
 300         }
 301
 302         /**
 303          * Dictionary-based conversion.
 304          * This function would not parse the conversion rules.
 305          * If you want to parse rules, try to use convert() or
 306          * convertTo().
 307          *
 308          * @param $text String: the text to be converted
 309          * @param $toVariant String: the target language code
 310          * @return String: the converted text
 311          */
 312         public function autoConvert( $text, $toVariant = false ) {
 313                 wfProfileIn( __METHOD__ );
 314
 315                 $this->loadTables();
 316
 317                 if ( !$toVariant ) {
 318                         $toVariant = $this->getPreferredVariant();
 319                         if ( !$toVariant ) {
 320                                 wfProfileOut( __METHOD__ );
 321                                 return $text;
 322                         }
 323                 }
 324
 325                 if( $this->guessVariant( $text, $toVariant ) ) {
 326                         return $text;
 327                 }
 328
 329                 /* we convert everything except:
 330                    1. HTML markups (anything between < and >)
 331                    2. HTML entities
 332                    3. placeholders created by the parser
 333                 */
 334                 global $wgParser;
 335                 if ( isset( $wgParser ) && $wgParser->UniqPrefix() != '' ) {
 336                         $marker = '|' . $wgParser->UniqPrefix() . '[\-a-zA-Z0-9]+';
 337                 } else {
 338                         $marker = '';
 339                 }
 340
 341                 // this one is needed when the text is inside an HTML markup
 342                 $htmlfix = '|<[^>]+$|^[^<>]*>';
 343
 344                 // disable convert to variants between <code></code> tags
 345                 $codefix = '<code>.+?<\/code>|';
 346                 // disable convertsion of <script type="text/javascript"> ... </script>
 347                 $scriptfix = '<script.*?>.*?<\/script>|';
 348                 // disable conversion of <pre xxxx> ... </pre>
 349                 $prefix = '<pre.*?>.*?<\/pre>|';
 350
 351                 $reg = '/' . $codefix . $scriptfix . $prefix .
 352                         '<[^>]+>|&[a-zA-Z#][a-z0-9]+;' . $marker . $htmlfix . '/s';
 353                 $startPos = 0;
 354                 $sourceBlob = '';
 355                 $literalBlob = '';
 356
 357                 // Guard against delimiter nulls in the input
 358                 $text = str_replace( "\000", '', $text );
 359
 360                 $markupMatches = null;
 361                 $elementMatches = null;
 362                 while ( $startPos < strlen( $text ) ) {
 363                         if ( preg_match( $reg, $text, $markupMatches, PREG_OFFSET_CAPTURE, $startPos ) ) {
 364                                 $elementPos = $markupMatches[0][1];
 365                                 $element = $markupMatches[0][0];
 366                         } else {
 367                                 $elementPos = strlen( $text );
 368                                 $element = '';
 369                         }
 370
 371                         // Queue the part before the markup for translation in a batch
 372                         $sourceBlob .= substr( $text, $startPos, $elementPos - $startPos ) . "\000";
 373
 374                         // Advance to the next position
 375                         $startPos = $elementPos + strlen( $element );
 376
 377                         // Translate any alt or title attributes inside the matched element
 378                         if ( $element !== '' && preg_match( '/^(<[^>\s]*)\s([^>]*)(.*)$/', $element,
 379                                 $elementMatches ) )
 380                         {
 381                                 $attrs = Sanitizer::decodeTagAttributes( $elementMatches[2] );
 382                                 $changed = false;
 383                                 foreach ( array( 'title', 'alt' ) as $attrName ) {
 384                                         if ( !isset( $attrs[$attrName] ) ) {
 385                                                 continue;
 386                                         }
 387                                         $attr = $attrs[$attrName];
 388                                         // Don't convert URLs
 389                                         if ( !strpos( $attr, '://' ) ) {
 390                                                 $attr = $this->translate( $attr, $toVariant );
 391                                         }
 392
 393                                         // Remove HTML tags to avoid disrupting the layout
 394                                         $attr = preg_replace( '/<[^>]+>/', '', $attr );
 395                                         if ( $attr !== $attrs[$attrName] ) {
 396                                                 $attrs[$attrName] = $attr;
 397                                                 $changed = true;
 398                                         }
 399                                 }
 400                                 if ( $changed ) {
 401                                         $element = $elementMatches[1] . Html::expandAttributes( $attrs ) .
 402                                                 $elementMatches[3];
 403                                 }
 404                         }
 405                         $literalBlob .= $element . "\000";
 406                 }
 407
 408                 // Do the main translation batch
 409                 $translatedBlob = $this->translate( $sourceBlob, $toVariant );
 410
 411                 // Put the output back together
 412                 $translatedIter = StringUtils::explode( "\000", $translatedBlob );
 413                 $literalIter = StringUtils::explode( "\000", $literalBlob );
 414                 $output = '';
 415                 while ( $translatedIter->valid() && $literalIter->valid() ) {
 416                         $output .= $translatedIter->current();
 417                         $output .= $literalIter->current();
 418                         $translatedIter->next();
 419                         $literalIter->next();
 420                 }
 421
 422                 wfProfileOut( __METHOD__ );
 423                 return $output;
 424         }
 425
 426         /**
 427          * Translate a string to a variant.
 428          * Doesn't parse rules or do any of that other stuff, for that use
 429          * convert() or convertTo().
 430          *
 431          * @param $text String: text to convert
 432          * @param $variant String: variant language code
 433          * @return String: translated text
 434          */
 435         public function translate( $text, $variant ) {
 436                 wfProfileIn( __METHOD__ );
 437                 // If $text is empty or only includes spaces, do nothing
 438                 // Otherwise translate it
 439                 if ( trim( $text ) ) {
 440                         $this->loadTables();
 441                         $text = $this->mTables[$variant]->replace( $text );
 442                 }
 443                 wfProfileOut( __METHOD__ );
 444                 return $text;
 445         }
 446
 447         /**
 448          * Call translate() to convert text to all valid variants.
 449          *
 450          * @param $text String: the text to be converted
 451          * @return Array: variant => converted text
 452          */
 453         public function autoConvertToAllVariants( $text ) {
 454                 wfProfileIn( __METHOD__ );
 455                 $this->loadTables();
 456
 457                 $ret = array();
 458                 foreach ( $this->mVariants as $variant ) {
 459                         $ret[$variant] = $this->translate( $text, $variant );
 460                 }
 461
 462                 wfProfileOut( __METHOD__ );
 463                 return $ret;
 464         }
 465
 466         /**
 467          * Convert link text to all valid variants.
 468          * In the first, this function only convert text outside the
 469          * "-{" "}-" markups. Since the "{" and "}" are not allowed in
 470          * titles, the text will get all converted always.
 471          * So I removed this feature and deprecated the function.
 472          *
 473          * @param $text String: the text to be converted
 474          * @return Array: variant => converted text
 475          * @deprecated since 1.17 Use autoConvertToAllVariants() instead
 476          */
 477         public function convertLinkToAllVariants( $text ) {
 478                 return $this->autoConvertToAllVariants( $text );
 479         }
 480
 481         /**
 482          * Apply manual conversion rules.
 483          *
 484          * @param $convRule Object: Object of ConverterRule
 485          */
 486         protected function applyManualConv( $convRule ) {
 487                 // Use syntax -{T|zh-cn:TitleCN; zh-tw:TitleTw}- to custom
 488                 // title conversion.
 489                 // Bug 24072: $mConvRuleTitle was overwritten by other manual
 490                 // rule(s) not for title, this breaks the title conversion.
 491                 $newConvRuleTitle = $convRule->getTitle();
 492                 if ( $newConvRuleTitle ) {
 493                         // So I add an empty check for getTitle()
 494                         $this->mConvRuleTitle = $newConvRuleTitle;
 495                 }
 496
 497                 // merge/remove manual conversion rules to/from global table
 498                 $convTable = $convRule->getConvTable();
 499                 $action = $convRule->getRulesAction();
 500                 foreach ( $convTable as $variant => $pair ) {
 501                         if ( !$this->validateVariant( $variant ) ) {
 502                                 continue;
 503                         }
 504
 505                         if ( $action == 'add' ) {
 506                                 foreach ( $pair as $from => $to ) {
 507                                         // to ensure that $from and $to not be left blank
 508                                         // so $this->translate() could always return a string
 509                                         if ( $from || $to ) {
 510                                                 // more efficient than array_merge(), about 2.5 times.
 511                                                 $this->mTables[$variant]->setPair( $from, $to );
 512                                         }
 513                                 }
 514                         } elseif ( $action == 'remove' ) {
 515                                 $this->mTables[$variant]->removeArray( $pair );
 516                         }
 517                 }
 518         }
 519
 520         /**
 521          * Auto convert a Title object to a readable string in the
 522          * preferred variant.
 523          *
 524          * @param $title Object: a object of Title
 525          * @return String: converted title text
 526          */
 527         public function convertTitle( $title ) {
 528                 $variant = $this->getPreferredVariant();
 529                 $index = $title->getNamespace();
 530                 if ( $index === NS_MAIN ) {
 531                         $text = '';
 532                 } else {
 533                         // first let's check if a message has given us a converted name
 534                         $nsConvKey = 'conversion-ns' . $index;
 535                         if ( !wfEmptyMsg( $nsConvKey ) ) {
 536                                 $text = wfMsgForContentNoTrans( $nsConvKey );
 537                         } else {
 538                                 // the message does not exist, try retrieve it from the current
 539                                 // variant's namespace names.
 540                                 $langObj = $this->mLangObj->factory( $variant );
 541                                 $text = $langObj->getFormattedNsText( $index );
 542                         }
 543                         $text .= ':';
 544                 }
 545                 $text .= $title->getText();
 546                 $text = $this->translate( $text, $variant );
 547                 return $text;
 548         }
 549
 550         /**
 551          * Convert text to different variants of a language. The automatic
 552          * conversion is done in autoConvert(). Here we parse the text
 553          * marked with -{}-, which specifies special conversions of the
 554          * text that can not be accomplished in autoConvert().
 555          *
 556          * Syntax of the markup:
 557          * -{code1:text1;code2:text2;...}-  or
 558          * -{flags|code1:text1;code2:text2;...}-  or
 559          * -{text}- in which case no conversion should take place for text
 560          *
 561          * @param $text String: text to be converted
 562          * @return String: converted text
 563          */
 564         public function convert( $text ) {
 565                 $variant = $this->getPreferredVariant();
 566                 return $this->convertTo( $text, $variant );
 567         }
 568
 569         /**
 570          * Same as convert() except a extra parameter to custom variant.
 571          *
 572          * @param $text String: text to be converted
 573          * @param $variant String: the target variant code
 574          * @return String: converted text
 575          */
 576         public function convertTo( $text, $variant ) {
 577                 global $wgDisableLangConversion;
 578                 if ( $wgDisableLangConversion || $this->guessVariant( $text, $variant ) ) {
 579                         return $text;
 580                 }
 581                 return $this->recursiveConvertTopLevel( $text, $variant );
 582         }
 583
 584         /**
 585          * Recursively convert text on the outside. Allow to use nested
 586          * markups to custom rules.
 587          *
 588          * @param $text String: text to be converted
 589          * @param $variant String: the target variant code
 590          * @param $depth Integer: depth of recursion
 591          * @return String: converted text
 592          */
 593         protected function recursiveConvertTopLevel( $text, $variant, $depth = 0 ) {
 594                 $startPos = 0;
 595                 $out = '';
 596                 $length = strlen( $text );
 597                 while ( $startPos < $length ) {
 598                         $pos = strpos( $text, '-{', $startPos );
 599
 600                         if ( $pos === false ) {
 601                                 // No more markup, append final segment
 602                                 $out .= $this->autoConvert( substr( $text, $startPos ), $variant );
 603                                 return $out;
 604                         }
 605
 606                         // Markup found
 607                         // Append initial segment
 608                         $out .= $this->autoConvert( substr( $text, $startPos, $pos - $startPos ), $variant );
 609
 610                         // Advance position
 611                         $startPos = $pos;
 612
 613                         // Do recursive conversion
 614                         $out .= $this->recursiveConvertRule( $text, $variant, $startPos, $depth + 1 );
 615                 }
 616
 617                 return $out;
 618         }
 619
 620         /**
 621          * Recursively convert text on the inside.
 622          *
 623          * @param $text String: text to be converted
 624          * @param $variant String: the target variant code
 625          * @param $depth Integer: depth of recursion
 626          * @return String: converted text
 627          */
 628         protected function recursiveConvertRule( $text, $variant, &$startPos, $depth = 0 ) {
 629                 // Quick sanity check (no function calls)
 630                 if ( $text[$startPos] !== '-' || $text[$startPos + 1] !== '{' ) {
 631                         throw new MWException( __METHOD__ . ': invalid input string' );
 632                 }
 633
 634                 $startPos += 2;
 635                 $inner = '';
 636                 $warningDone = false;
 637                 $length = strlen( $text );
 638
 639                 while ( $startPos < $length ) {
 640                         $m = false;
 641                         preg_match( '/-\{|\}-/', $text, $m,  PREG_OFFSET_CAPTURE, $startPos );
 642                         if ( !$m ) {
 643                                 // Unclosed rule
 644                                 break;
 645                         }
 646
 647                         $token = $m[0][0];
 648                         $pos = $m[0][1];
 649
 650                         // Markup found
 651                         // Append initial segment
 652                         $inner .= substr( $text, $startPos, $pos - $startPos );
 653
 654                         // Advance position
 655                         $startPos = $pos;
 656
 657                         switch ( $token ) {
 658                                 case '-{':
 659                                         // Check max depth
 660                                         if ( $depth >= $this->mMaxDepth ) {
 661                                                 $inner .= '-{';
 662                                                 if ( !$warningDone ) {
 663                                                         $inner .= '<span class="error">' .
 664                                                                 wfMsgForContent( 'language-converter-depth-warning',
 665                                                                         $this->mMaxDepth ) .
 666                                                                 '</span>';
 667                                                         $warningDone = true;
 668                                                 }
 669                                                 $startPos += 2;
 670                                                 continue;
 671                                         }
 672                                         // Recursively parse another rule
 673                                         $inner .= $this->recursiveConvertRule( $text, $variant, $startPos, $depth + 1 );
 674                                         break;
 675                                 case '}-':
 676                                         // Apply the rule
 677                                         $startPos += 2;
 678                                         $rule = new ConverterRule( $inner, $this );
 679                                         $rule->parse( $variant );
 680                                         $this->applyManualConv( $rule );
 681                                         return $rule->getDisplay();
 682                                 default:
 683                                         throw new MWException( __METHOD__ . ': invalid regex match' );
 684                         }
 685                 }
 686
 687                 // Unclosed rule
 688                 if ( $startPos < $length ) {
 689                         $inner .= substr( $text, $startPos );
 690                 }
 691                 $startPos = $length;
 692                 return '-{' . $this->autoConvert( $inner, $variant );
 693         }
 694
 695         /**
 696          * If a language supports multiple variants, it is possible that
 697          * non-existing link in one variant actually exists in another variant.
 698          * This function tries to find it. See e.g. LanguageZh.php
 699          *
 700          * @param $link String: the name of the link
 701          * @param $nt Mixed: the title object of the link
 702          * @param $ignoreOtherCond Boolean: to disable other conditions when
 703          *              we need to transclude a template or update a category's link
 704          * @return Null, the input parameters may be modified upon return
 705          */
 706         public function findVariantLink( &$link, &$nt, $ignoreOtherCond = false ) {
 707                 # If the article has already existed, there is no need to
 708                 # check it again, otherwise it may cause a fault.
 709                 if ( is_object( $nt ) && $nt->exists() ) {
 710                         return;
 711                 }
 712
 713                 global $wgDisableLangConversion, $wgDisableTitleConversion, $wgRequest,
 714                         $wgUser;
 715                 $isredir = $wgRequest->getText( 'redirect', 'yes' );
 716                 $action = $wgRequest->getText( 'action' );
 717                 $linkconvert = $wgRequest->getText( 'linkconvert', 'yes' );
 718                 $disableLinkConversion = $wgDisableLangConversion
 719                         || $wgDisableTitleConversion;
 720                 $linkBatch = new LinkBatch();
 721
 722                 $ns = NS_MAIN;
 723
 724                 if ( $disableLinkConversion ||
 725                          ( !$ignoreOtherCond &&
 726                            ( $isredir == 'no'
 727                                  || $action == 'edit'
 728                                  || $action == 'submit'
 729                                  || $linkconvert == 'no'
 730                                  || $wgUser->getOption( 'noconvertlink' ) == 1 ) ) ) {
 731                         return;
 732                 }
 733
 734                 if ( is_object( $nt ) ) {
 735                         $ns = $nt->getNamespace();
 736                 }
 737
 738                 $variants = $this->autoConvertToAllVariants( $link );
 739                 if ( !$variants ) { // give up
 740                         return;
 741                 }
 742
 743                 $titles = array();
 744
 745                 foreach ( $variants as $v ) {
 746                         if ( $v != $link ) {
 747                                 $varnt = Title::newFromText( $v, $ns );
 748                                 if ( !is_null( $varnt ) ) {
 749                                         $linkBatch->addObj( $varnt );
 750                                         $titles[] = $varnt;
 751                                 }
 752                         }
 753                 }
 754
 755                 // fetch all variants in single query
 756                 $linkBatch->execute();
 757
 758                 foreach ( $titles as $varnt ) {
 759                         if ( $varnt->getArticleID() > 0 ) {
 760                                 $nt = $varnt;
 761                                 $link = $varnt->getText();
 762                                 break;
 763                         }
 764                 }
 765         }
 766
 767         /**
 768          * Returns language specific hash options.
 769          */
 770         public function getExtraHashOptions() {
 771                 $variant = $this->getPreferredVariant();
 772                 return '!' . $variant;
 773         }
 774
 775         /**
 776          * Guess if a text is written in a variant. This should be implemented in subclasses.
 777          *
 778          * @param string        $text the text to be checked
 779          * @param string        $variant language code of the variant to be checked for
 780          * @return bool true if $text appears to be written in $variant, false if not
 781          *
 782          * @author Nikola Smolenski <smolensk@eunet.rs>
 783          * @since 1.18
 784          */
 785         public function guessVariant($text, $variant) {
 786                 return false;
 787         }
 788
 789         /**
 790          * Load default conversion tables.
 791          * This method must be implemented in derived class.
 792          *
 793          * @private
 794          */
 795         function loadDefaultTables() {
 796                 $name = get_class( $this );
 797                 wfDie( "Must implement loadDefaultTables() method in class $name" );
 798         }
 799
 800         /**
 801          * Load conversion tables either from the cache or the disk.
 802          * @private
 803          * @param $fromCache Boolean: load from memcached? Defaults to true.
 804          */
 805         function loadTables( $fromCache = true ) {
 806                 if ( $this->mTablesLoaded ) {
 807                         return;
 808                 }
 809                 global $wgMemc;
 810                 wfProfileIn( __METHOD__ );
 811                 $this->mTablesLoaded = true;
 812                 $this->mTables = false;
 813                 if ( $fromCache ) {
 814                         wfProfileIn( __METHOD__ . '-cache' );
 815                         $this->mTables = $wgMemc->get( $this->mCacheKey );
 816                         wfProfileOut( __METHOD__ . '-cache' );
 817                 }
 818                 if ( !$this->mTables
 819                          || !array_key_exists( self::CACHE_VERSION_KEY, $this->mTables ) ) {
 820                         wfProfileIn( __METHOD__ . '-recache' );
 821                         // not in cache, or we need a fresh reload.
 822                         // We will first load the default tables
 823                         // then update them using things in MediaWiki:Conversiontable/*
 824                         $this->loadDefaultTables();
 825                         foreach ( $this->mVariants as $var ) {
 826                                 $cached = $this->parseCachedTable( $var );
 827                                 $this->mTables[$var]->mergeArray( $cached );
 828                         }
 829
 830                         $this->postLoadTables();
 831                         $this->mTables[self::CACHE_VERSION_KEY] = true;
 832
 833                         $wgMemc->set( $this->mCacheKey, $this->mTables, 43200 );
 834                         wfProfileOut( __METHOD__ . '-recache' );
 835                 }
 836                 wfProfileOut( __METHOD__ );
 837         }
 838
 839         /**
 840          * Hook for post processing after conversion tables are loaded.
 841          */
 842         function postLoadTables() { }
 843
 844         /**
 845          * Reload the conversion tables.
 846          *
 847          * @private
 848          */
 849         function reloadTables() {
 850                 if ( $this->mTables ) {
 851                         unset( $this->mTables );
 852                 }
 853                 $this->mTablesLoaded = false;
 854                 $this->loadTables( false );
 855         }
 856
 857         /**
 858          * Parse the conversion table stored in the cache.
 859          *
 860          * The tables should be in blocks of the following form:
 861          *              -{
 862          *                      word => word ;
 863          *                      word => word ;
 864          *                      ...
 865          *              }-
 866          *
 867          * To make the tables more manageable, subpages are allowed
 868          * and will be parsed recursively if $recursive == true.
 869          *
 870          * @param $code String: language code
 871          * @param $subpage String: subpage name
 872          * @param $recursive Boolean: parse subpages recursively? Defaults to true.
 873          */
 874         function parseCachedTable( $code, $subpage = '', $recursive = true ) {
 875                 static $parsed = array();
 876
 877                 $key = 'Conversiontable/' . $code;
 878                 if ( $subpage ) {
 879                         $key .= '/' . $subpage;
 880                 }
 881                 if ( array_key_exists( $key, $parsed ) ) {
 882                         return array();
 883                 }
 884
 885                 if ( strpos( $code, '/' ) === false ) {
 886                         $txt = MessageCache::singleton()->get( 'Conversiontable', true, $code );
 887                         if ( $txt === false ) {
 888                                 # FIXME: this method doesn't seem to be expecting
 889                                 # this possible outcome...
 890                                 $txt = '&lt;Conversiontable&gt;';
 891                         }
 892                 } else {
 893                         $title = Title::makeTitleSafe(
 894                                 NS_MEDIAWIKI,
 895                                 "Conversiontable/$code"
 896                         );
 897                         if ( $title && $title->exists() ) {
 898                                 $article = new Article( $title );
 899                                 $txt = $article->getContents();
 900                         } else {
 901                                 $txt = '';
 902                         }
 903                 }
 904
 905                 // get all subpage links of the form
 906                 // [[MediaWiki:Conversiontable/zh-xx/...|...]]
 907                 $linkhead = $this->mLangObj->getNsText( NS_MEDIAWIKI ) .
 908                         ':Conversiontable';
 909                 $subs = StringUtils::explode( '[[', $txt );
 910                 $sublinks = array();
 911                 foreach ( $subs as $sub ) {
 912                         $link = explode( ']]', $sub, 2 );
 913                         if ( count( $link ) != 2 ) {
 914                                 continue;
 915                         }
 916                         $b = explode( '|', $link[0], 2 );
 917                         $b = explode( '/', trim( $b[0] ), 3 );
 918                         if ( count( $b ) == 3 ) {
 919                                 $sublink = $b[2];
 920                         } else {
 921                                 $sublink = '';
 922                         }
 923
 924                         if ( $b[0] == $linkhead && $b[1] == $code ) {
 925                                 $sublinks[] = $sublink;
 926                         }
 927                 }
 928
 929                 // parse the mappings in this page
 930                 $blocks = StringUtils::explode( '-{', $txt );
 931                 $ret = array();
 932                 $first = true;
 933                 foreach ( $blocks as $block ) {
 934                         if ( $first ) {
 935                                 // Skip the part before the first -{
 936                                 $first = false;
 937                                 continue;
 938                         }
 939                         $mappings = explode( '}-', $block, 2 );
 940                         $stripped = str_replace( array( "'", '"', '*', '#' ), '',
 941                                                                          $mappings[0] );
 942                         $table = StringUtils::explode( ';', $stripped );
 943                         foreach ( $table as $t ) {
 944                                 $m = explode( '=>', $t, 3 );
 945                                 if ( count( $m ) != 2 ) {
 946                                         continue;
 947                                 }
 948                                 // trim any trailling comments starting with '//'
 949                                 $tt = explode( '//', $m[1], 2 );
 950                                 $ret[trim( $m[0] )] = trim( $tt[0] );
 951                         }
 952                 }
 953                 $parsed[$key] = true;
 954
 955                 // recursively parse the subpages
 956                 if ( $recursive ) {
 957                         foreach ( $sublinks as $link ) {
 958                                 $s = $this->parseCachedTable( $code, $link, $recursive );
 959                                 $ret = array_merge( $ret, $s );
 960                         }
 961                 }
 962
 963                 if ( $this->mUcfirst ) {
 964                         foreach ( $ret as $k => $v ) {
 965                                 $ret[$this->mLangObj->ucfirst( $k )] = $this->mLangObj->ucfirst( $v );
 966                         }
 967                 }
 968                 return $ret;
 969         }
 970
 971         /**
 972          * Enclose a string with the "no conversion" tag. This is used by
 973          * various functions in the Parser.
 974          *
 975          * @param $text String: text to be tagged for no conversion
 976          * @param $noParse Boolean: unused
 977          * @return String: the tagged text
 978          */
 979         public function markNoConversion( $text, $noParse = false ) {
 980                 # don't mark if already marked
 981                 if ( strpos( $text, '-{' ) || strpos( $text, '}-' ) ) {
 982                         return $text;
 983                 }
 984
 985                 $ret = "-{R|$text}-";
 986                 return $ret;
 987         }
 988
 989         /**
 990          * Convert the sorting key for category links. This should make different
 991          * keys that are variants of each other map to the same key.
 992          */
 993         function convertCategoryKey( $key ) {
 994                 return $key;
 995         }
 996
 997         /**
 998          * Hook to refresh the cache of conversion tables when
 999          * MediaWiki:Conversiontable* is updated.
1000          * @private
1001          *
1002          * @param $article Object: Article object
1003          * @param $user Object: User object for the current user
1004          * @param $text String: article text (?)
1005          * @param $summary String: edit summary of the edit
1006          * @param $isMinor Boolean: was the edit marked as minor?
1007          * @param $isWatch Boolean: did the user watch this page or not?
1008          * @param $section Unused
1009          * @param $flags Bitfield
1010          * @param $revision Object: new Revision object or null
1011          * @return Boolean: true
1012          */
1013         function OnArticleSaveComplete( $article, $user, $text, $summary, $isMinor,
1014                         $isWatch, $section, $flags, $revision ) {
1015                 $titleobj = $article->getTitle();
1016                 if ( $titleobj->getNamespace() == NS_MEDIAWIKI ) {
1017                         $title = $titleobj->getDBkey();
1018                         $t = explode( '/', $title, 3 );
1019                         $c = count( $t );
1020                         if ( $c > 1 && $t[0] == 'Conversiontable' ) {
1021                                 if ( $this->validateVariant( $t[1] ) ) {
1022                                         $this->reloadTables();
1023                                 }
1024                         }
1025                 }
1026                 return true;
1027         }
1028
1029         /**
1030          * Armour rendered math against conversion.
1031          * Escape special chars in parsed math text. (in most cases are img elements)
1032          *
1033          * @param $text String: text to armour against conversion
1034          * @return String: armoured text where { and } have been converted to
1035          *                 &#123; and &#125;
1036          */
1037         public function armourMath( $text ) {
1038                 // convert '-{' and '}-' to '-&#123;' and '&#125;-' to prevent
1039                 // any unwanted markup appearing in the math image tag.
1040                 $text = strtr( $text, array( '-{' => '-&#123;', '}-' => '&#125;-' ) );
1041                 return $text;
1042         }
1043
1044         /**
1045          * Get the cached separator pattern for ConverterRule::parseRules()
1046          */
1047         function getVarSeparatorPattern() {
1048                 if ( is_null( $this->mVarSeparatorPattern ) ) {
1049                         // varsep_pattern for preg_split:
1050                         // text should be splited by ";" only if a valid variant
1051                         // name exist after the markup, for example:
1052                         //  -{zh-hans:<span style="font-size:120%;">xxx</span>;zh-hant:\
1053                         //      <span style="font-size:120%;">yyy</span>;}-
1054                         // we should split it as:
1055                         //  array(
1056                         //        [0] => 'zh-hans:<span style="font-size:120%;">xxx</span>'
1057                         //        [1] => 'zh-hant:<span style="font-size:120%;">yyy</span>'
1058                         //        [2] => ''
1059                         //       )
1060                         $pat = '/;\s*(?=';
1061                         foreach ( $this->mVariants as $variant ) {
1062                                 // zh-hans:xxx;zh-hant:yyy
1063                                 $pat .= $variant . '\s*:|';
1064                                 // xxx=>zh-hans:yyy; xxx=>zh-hant:zzz
1065                                 $pat .= '[^;]*?=>\s*' . $variant . '\s*:|';
1066                         }
1067                         $pat .= '\s*$)/';
1068                         $this->mVarSeparatorPattern = $pat;
1069                 }
1070                 return $this->mVarSeparatorPattern;
1071         }
1072 }
1073
1074 /**
1075  * Parser for rules of language conversion , parse rules in -{ }- tag.
1076  * @ingroup Language
1077  * @author fdcn <fdcn64@gmail.com>, PhiLiP <philip.npc@gmail.com>
1078  */
1079 class ConverterRule {
1080         var $mText; // original text in -{text}-
1081         var $mConverter; // LanguageConverter object
1082         var $mManualCodeError = '<strong class="error">code error!</strong>';
1083         var $mRuleDisplay = '';
1084         var $mRuleTitle = false;
1085         var $mRules = '';// string : the text of the rules
1086         var $mRulesAction = 'none';
1087         var $mFlags = array();
1088         var $mVariantFlags = array();
1089         var $mConvTable = array();
1090         var $mBidtable = array();// array of the translation in each variant
1091         var $mUnidtable = array();// array of the translation in each variant
1092
1093         /**
1094          * Constructor
1095          *
1096          * @param $text String: the text between -{ and }-
1097          * @param $converter LanguageConverter object
1098          */
1099         public function __construct( $text, $converter ) {
1100                 $this->mText = $text;
1101                 $this->mConverter = $converter;
1102         }
1103
1104         /**
1105          * Check if variants array in convert array.
1106          *
1107          * @param $variants Array or string: variant language code
1108          * @return String: translated text
1109          */
1110         public function getTextInBidtable( $variants ) {
1111                 $variants = (array)$variants;
1112                 if ( !$variants ) {
1113                         return false;
1114                 }
1115                 foreach ( $variants as $variant ) {
1116                         if ( isset( $this->mBidtable[$variant] ) ) {
1117                                 return $this->mBidtable[$variant];
1118                         }
1119                 }
1120                 return false;
1121         }
1122
1123         /**
1124          * Parse flags with syntax -{FLAG| ... }-
1125          * @private
1126          */
1127         function parseFlags() {
1128                 $text = $this->mText;
1129                 $flags = array();
1130                 $variantFlags = array();
1131
1132                 $sepPos = strpos( $text, '|' );
1133                 if ( $sepPos !== false ) {
1134                         $validFlags = $this->mConverter->mFlags;
1135                         $f = StringUtils::explode( ';', substr( $text, 0, $sepPos ) );
1136                         foreach ( $f as $ff ) {
1137                                 $ff = trim( $ff );
1138                                 if ( isset( $validFlags[$ff] ) ) {
1139                                         $flags[$validFlags[$ff]] = true;
1140                                 }
1141                         }
1142                         $text = strval( substr( $text, $sepPos + 1 ) );
1143                 }
1144
1145                 if ( !$flags ) {
1146                         $flags['S'] = true;
1147                 } elseif ( isset( $flags['R'] ) ) {
1148                         $flags = array( 'R' => true );// remove other flags
1149                 } elseif ( isset( $flags['N'] ) ) {
1150                         $flags = array( 'N' => true );// remove other flags
1151                 } elseif ( isset( $flags['-'] ) ) {
1152                         $flags = array( '-' => true );// remove other flags
1153                 } elseif ( count( $flags ) == 1 && isset( $flags['T'] ) ) {
1154                         $flags['H'] = true;
1155                 } elseif ( isset( $flags['H'] ) ) {
1156                         // replace A flag, and remove other flags except T
1157                         $temp = array( '+' => true, 'H' => true );
1158                         if ( isset( $flags['T'] ) ) {
1159                                 $temp['T'] = true;
1160                         }
1161                         if ( isset( $flags['D'] ) ) {
1162                                 $temp['D'] = true;
1163                         }
1164                         $flags = $temp;
1165                 } else {
1166                         if ( isset( $flags['A'] ) ) {
1167                                 $flags['+'] = true;
1168                                 $flags['S'] = true;
1169                         }
1170                         if ( isset( $flags['D'] ) ) {
1171                                 unset( $flags['S'] );
1172                         }
1173                         // try to find flags like "zh-hans", "zh-hant"
1174                         // allow syntaxes like "-{zh-hans;zh-hant|XXXX}-"
1175                         $variantFlags = array_intersect( array_keys( $flags ), $this->mConverter->mVariants );
1176                         if ( $variantFlags ) {
1177                                 $variantFlags = array_flip( $variantFlags );
1178                                 $flags = array();
1179                         }
1180                 }
1181                 $this->mVariantFlags = $variantFlags;
1182                 $this->mRules = $text;
1183                 $this->mFlags = $flags;
1184         }
1185
1186         /**
1187          * Generate conversion table.
1188          * @private
1189          */
1190         function parseRules() {
1191                 $rules = $this->mRules;
1192                 $bidtable = array();
1193                 $unidtable = array();
1194                 $variants = $this->mConverter->mVariants;
1195                 $varsep_pattern = $this->mConverter->getVarSeparatorPattern();
1196
1197                 $choice = preg_split( $varsep_pattern, $rules );
1198
1199                 foreach ( $choice as $c ) {
1200                         $v  = explode( ':', $c, 2 );
1201                         if ( count( $v ) != 2 ) {
1202                                 // syntax error, skip
1203                                 continue;
1204                         }
1205                         $to = trim( $v[1] );
1206                         $v  = trim( $v[0] );
1207                         $u  = explode( '=>', $v, 2 );
1208                         // if $to is empty, strtr() could return a wrong result
1209                         if ( count( $u ) == 1 && $to && in_array( $v, $variants ) ) {
1210                                 $bidtable[$v] = $to;
1211                         } elseif ( count( $u ) == 2 ) {
1212                                 $from = trim( $u[0] );
1213                                 $v      = trim( $u[1] );
1214                                 if ( array_key_exists( $v, $unidtable )
1215                                          && !is_array( $unidtable[$v] )
1216                                          && $to
1217                                          && in_array( $v, $variants ) ) {
1218                                         $unidtable[$v] = array( $from => $to );
1219                                 } elseif ( $to && in_array( $v, $variants ) ) {
1220                                         $unidtable[$v][$from] = $to;
1221                                 }
1222                         }
1223                         // syntax error, pass
1224                         if ( !isset( $this->mConverter->mVariantNames[$v] ) ) {
1225                                 $bidtable = array();
1226                                 $unidtable = array();
1227                                 break;
1228                         }
1229                 }
1230                 $this->mBidtable = $bidtable;
1231                 $this->mUnidtable = $unidtable;
1232         }
1233
1234         /**
1235          * @private
1236          */
1237         function getRulesDesc() {
1238                 $codesep = $this->mConverter->mDescCodeSep;
1239                 $varsep = $this->mConverter->mDescVarSep;
1240                 $text = '';
1241                 foreach ( $this->mBidtable as $k => $v ) {
1242                         $text .= $this->mConverter->mVariantNames[$k] . "$codesep$v$varsep";
1243                 }
1244                 foreach ( $this->mUnidtable as $k => $a ) {
1245                         foreach ( $a as $from => $to ) {
1246                                 $text .= $from . '⇒' . $this->mConverter->mVariantNames[$k] .
1247                                         "$codesep$to$varsep";
1248                         }
1249                 }
1250                 return $text;
1251         }
1252
1253         /**
1254          * Parse rules conversion.
1255          * @private
1256          */
1257         function getRuleConvertedStr( $variant ) {
1258                 $bidtable = $this->mBidtable;
1259                 $unidtable = $this->mUnidtable;
1260
1261                 if ( count( $bidtable ) + count( $unidtable ) == 0 ) {
1262                         return $this->mRules;
1263                 } else {
1264                         // display current variant in bidirectional array
1265                         $disp = $this->getTextInBidtable( $variant );
1266                         // or display current variant in fallbacks
1267                         if ( !$disp ) {
1268                                 $disp = $this->getTextInBidtable(
1269                                                 $this->mConverter->getVariantFallbacks( $variant ) );
1270                         }
1271                         // or display current variant in unidirectional array
1272                         if ( !$disp && array_key_exists( $variant, $unidtable ) ) {
1273                                 $disp = array_values( $unidtable[$variant] );
1274                                 $disp = $disp[0];
1275                         }
1276                         // or display frist text under disable manual convert
1277                         if ( !$disp
1278                                  && $this->mConverter->mManualLevel[$variant] == 'disable' ) {
1279                                 if ( count( $bidtable ) > 0 ) {
1280                                         $disp = array_values( $bidtable );
1281                                         $disp = $disp[0];
1282                                 } else {
1283                                         $disp = array_values( $unidtable );
1284                                         $disp = array_values( $disp[0] );
1285                                         $disp = $disp[0];
1286                                 }
1287                         }
1288                         return $disp;
1289                 }
1290         }
1291
1292         /**
1293          * Generate conversion table for all text.
1294          * @private
1295          */
1296         function generateConvTable() {
1297                 // Special case optimisation
1298                 if ( !$this->mBidtable && !$this->mUnidtable ) {
1299                         $this->mConvTable = array();
1300                         return;
1301                 }
1302
1303                 $bidtable = $this->mBidtable;
1304                 $unidtable = $this->mUnidtable;
1305                 $manLevel = $this->mConverter->mManualLevel;
1306
1307                 $vmarked = array();
1308                 foreach ( $this->mConverter->mVariants as $v ) {
1309                         /* for bidirectional array
1310                                 fill in the missing variants, if any,
1311                                 with fallbacks */
1312                         if ( !isset( $bidtable[$v] ) ) {
1313                                 $variantFallbacks =
1314                                         $this->mConverter->getVariantFallbacks( $v );
1315                                 $vf = $this->getTextInBidtable( $variantFallbacks );
1316                                 if ( $vf ) {
1317                                         $bidtable[$v] = $vf;
1318                                 }
1319                         }
1320
1321                         if ( isset( $bidtable[$v] ) ) {
1322                                 foreach ( $vmarked as $vo ) {
1323                                         // use syntax: -{A|zh:WordZh;zh-tw:WordTw}-
1324                                         // or -{H|zh:WordZh;zh-tw:WordTw}-
1325                                         // or -{-|zh:WordZh;zh-tw:WordTw}-
1326                                         // to introduce a custom mapping between
1327                                         // words WordZh and WordTw in the whole text
1328                                         if ( $manLevel[$v] == 'bidirectional' ) {
1329                                                 $this->mConvTable[$v][$bidtable[$vo]] = $bidtable[$v];
1330                                         }
1331                                         if ( $manLevel[$vo] == 'bidirectional' ) {
1332                                                 $this->mConvTable[$vo][$bidtable[$v]] = $bidtable[$vo];
1333                                         }
1334                                 }
1335                                 $vmarked[] = $v;
1336                         }
1337                         /* for unidirectional array fill to convert tables */
1338                         if ( ( $manLevel[$v] == 'bidirectional' || $manLevel[$v] == 'unidirectional' )
1339                                 && isset( $unidtable[$v] ) )
1340                         {
1341                                 if ( isset( $this->mConvTable[$v] ) ) {
1342                                         $this->mConvTable[$v] = array_merge( $this->mConvTable[$v], $unidtable[$v] );
1343                                 } else {
1344                                         $this->mConvTable[$v] = $unidtable[$v];
1345                                 }
1346                         }
1347                 }
1348         }
1349
1350         /**
1351          * Parse rules and flags.
1352          * @param $variant String: variant language code
1353          */
1354         public function parse( $variant = null ) {
1355                 if ( !$variant ) {
1356                         $variant = $this->mConverter->getPreferredVariant();
1357                 }
1358
1359                 $this->parseFlags();
1360                 $flags = $this->mFlags;
1361
1362                 // convert to specified variant
1363                 // syntax: -{zh-hans;zh-hant[;...]|<text to convert>}-
1364                 if ( $this->mVariantFlags ) {
1365                         // check if current variant in flags
1366                         if ( isset( $this->mVariantFlags[$variant] ) ) {
1367                                 // then convert <text to convert> to current language
1368                                 $this->mRules = $this->mConverter->autoConvert( $this->mRules,
1369                                                                                                                                 $variant );
1370                         } else { // if current variant no in flags,
1371                                    // then we check its fallback variants.
1372                                 $variantFallbacks =
1373                                         $this->mConverter->getVariantFallbacks( $variant );
1374                                 foreach ( $variantFallbacks as $variantFallback ) {
1375                                         // if current variant's fallback exist in flags
1376                                         if ( isset( $this->mVariantFlags[$variantFallback] ) ) {
1377                                                 // then convert <text to convert> to fallback language
1378                                                 $this->mRules =
1379                                                         $this->mConverter->autoConvert( $this->mRules,
1380                                                                                                                         $variantFallback );
1381                                                 break;
1382                                         }
1383                                 }
1384                         }
1385                         $this->mFlags = $flags = array( 'R' => true );
1386                 }
1387
1388                 if ( !isset( $flags['R'] ) && !isset( $flags['N'] ) ) {
1389                         // decode => HTML entities modified by Sanitizer::removeHTMLtags
1390                         $this->mRules = str_replace( '=&gt;', '=>', $this->mRules );
1391                         $this->parseRules();
1392                 }
1393                 $rules = $this->mRules;
1394
1395                 if ( !$this->mBidtable && !$this->mUnidtable ) {
1396                         if ( isset( $flags['+'] ) || isset( $flags['-'] ) ) {
1397                                 // fill all variants if text in -{A/H/-|text} without rules
1398                                 foreach ( $this->mConverter->mVariants as $v ) {
1399                                         $this->mBidtable[$v] = $rules;
1400                                 }
1401                         } elseif ( !isset( $flags['N'] ) && !isset( $flags['T'] ) ) {
1402                                 $this->mFlags = $flags = array( 'R' => true );
1403                         }
1404                 }
1405
1406                 $this->mRuleDisplay = false;
1407                 foreach ( $flags as $flag => $unused ) {
1408                         switch ( $flag ) {
1409                                 case 'R':
1410                                         // if we don't do content convert, still strip the -{}- tags
1411                                         $this->mRuleDisplay = $rules;
1412                                         break;
1413                                 case 'N':
1414                                         // process N flag: output current variant name
1415                                         $ruleVar = trim( $rules );
1416                                         if ( isset( $this->mConverter->mVariantNames[$ruleVar] ) ) {
1417                                                 $this->mRuleDisplay = $this->mConverter->mVariantNames[$ruleVar];
1418                                         } else {
1419                                                 $this->mRuleDisplay = '';
1420                                         }
1421                                         break;
1422                                 case 'D':
1423                                         // process D flag: output rules description
1424                                         $this->mRuleDisplay = $this->getRulesDesc();
1425                                         break;
1426                                 case 'H':
1427                                         // process H,- flag or T only: output nothing
1428                                         $this->mRuleDisplay = '';
1429                                         break;
1430                                 case '-':
1431                                         $this->mRulesAction = 'remove';
1432                                         $this->mRuleDisplay = '';
1433                                         break;
1434                                 case '+':
1435                                         $this->mRulesAction = 'add';
1436                                         $this->mRuleDisplay = '';
1437                                         break;
1438                                 case 'S':
1439                                         $this->mRuleDisplay = $this->getRuleConvertedStr( $variant );
1440                                         break;
1441                                 case 'T':
1442                                         $this->mRuleTitle = $this->getRuleConvertedStr( $variant );
1443                                         $this->mRuleDisplay = '';
1444                                         break;
1445                                 default:
1446                                         // ignore unknown flags (but see error case below)
1447                         }
1448                 }
1449                 if ( $this->mRuleDisplay === false ) {
1450                         $this->mRuleDisplay = $this->mManualCodeError;
1451                 }
1452
1453                 $this->generateConvTable();
1454         }
1455
1456         /**
1457          * @todo FIXME: code this function :)
1458          */
1459         public function hasRules() {
1460                 // TODO:
1461         }
1462
1463         /**
1464          * Get display text on markup -{...}-
1465          */
1466         public function getDisplay() {
1467                 return $this->mRuleDisplay;
1468         }
1469
1470         /**
1471          * Get converted title.
1472          */
1473         public function getTitle() {
1474                 return $this->mRuleTitle;
1475         }
1476
1477         /**
1478          * Return how deal with conversion rules.
1479          */
1480         public function getRulesAction() {
1481                 return $this->mRulesAction;
1482         }
1483
1484         /**
1485          * Get conversion table. (bidirectional and unidirectional
1486          * conversion table)
1487          */
1488         public function getConvTable() {
1489                 return $this->mConvTable;
1490         }
1491
1492         /**
1493          * Get conversion rules string.
1494          */
1495         public function getRules() {
1496                 return $this->mRules;
1497         }
1498
1499         /**
1500          * Get conversion flags.
1501          */
1502         public function getFlags() {
1503                 return $this->mFlags;
1504         }
1505 }