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
  33         /**
  34          * languages supporting variants
  35          * @since 1.20
  36          * @var array
  37          */
  38         static public $languagesWithVariants = array(
  39                 'gan',
  40                 'iu',
  41                 'kk',
  42                 'ku',
  43                 'shi',
  44                 'sr',
  45                 'tg',
  46                 'uz',
  47                 'zh',
  48         );
  49
  50         public $mMainLanguageCode;
  51         public $mVariants, $mVariantFallbacks, $mVariantNames;
  52         public $mTablesLoaded = false;
  53         public $mTables;
  54         // 'bidirectional' 'unidirectional' 'disable' for each variant
  55         public $mManualLevel;
  56
  57         /**
  58          * @var String: memcached key name
  59          */
  60         public $mCacheKey;
  61
  62         public $mLangObj;
  63         public $mFlags;
  64         public $mDescCodeSep = ':', $mDescVarSep = ';';
  65         public $mUcfirst = false;
  66         public $mConvRuleTitle = false;
  67         public $mURLVariant;
  68         public $mUserVariant;
  69         public $mHeaderVariant;
  70         public $mMaxDepth = 10;
  71         public $mVarSeparatorPattern;
  72
  73         const CACHE_VERSION_KEY = 'VERSION 6';
  74
  75         /**
  76          * Constructor
  77          *
  78          * @param $langobj Language: the Language Object
  79          * @param $maincode String: the main language code of this language
  80          * @param $variants Array: the supported variants of this language
  81          * @param $variantfallbacks Array: the fallback language of each variant
  82          * @param $flags Array: defining the custom strings that maps to the flags
  83          * @param $manualLevel Array: limit for supported variants
  84          */
  85         public function __construct( $langobj, $maincode, $variants = array(),
  86                                                                 $variantfallbacks = array(), $flags = array(),
  87                                                                 $manualLevel = array() ) {
  88                 global $wgDisabledVariants;
  89                 $this->mLangObj = $langobj;
  90                 $this->mMainLanguageCode = $maincode;
  91                 $this->mVariants = array_diff( $variants, $wgDisabledVariants );
  92                 $this->mVariantFallbacks = $variantfallbacks;
  93                 $this->mVariantNames = Language::fetchLanguageNames();
  94                 $this->mCacheKey = wfMemcKey( 'conversiontables', $maincode );
  95                 $defaultflags = array(
  96                         // 'S' show converted text
  97                         // '+' add rules for alltext
  98                         // 'E' the gave flags is error
  99                         // these flags above are reserved for program
 100                         'A' => 'A',       // add rule for convert code (all text convert)
 101                         'T' => 'T',       // title convert
 102                         'R' => 'R',       // raw content
 103                         'D' => 'D',       // convert description (subclass implement)
 104                         '-' => '-',       // remove convert (not implement)
 105                         'H' => 'H',       // add rule for convert code
 106                                                   // (but no display in placed code)
 107                         'N' => 'N'        // current variant name
 108                 );
 109                 $this->mFlags = array_merge( $defaultflags, $flags );
 110                 foreach ( $this->mVariants as $v ) {
 111                         if ( array_key_exists( $v, $manualLevel ) ) {
 112                                 $this->mManualLevel[$v] = $manualLevel[$v];
 113                         } else {
 114                                 $this->mManualLevel[$v] = 'bidirectional';
 115                         }
 116                         $this->mFlags[$v] = $v;
 117                 }
 118         }
 119
 120         /**
 121          * Get all valid variants.
 122          * Call this instead of using $this->mVariants directly.
 123          *
 124          * @return Array: contains all valid variants
 125          */
 126         public function getVariants() {
 127                 return $this->mVariants;
 128         }
 129
 130         /**
 131          * In case some variant is not defined in the markup, we need
 132          * to have some fallback. For example, in zh, normally people
 133          * will define zh-hans and zh-hant, but less so for zh-sg or zh-hk.
 134          * when zh-sg is preferred but not defined, we will pick zh-hans
 135          * in this case. Right now this is only used by zh.
 136          *
 137          * @param $variant String: the language code of the variant
 138          * @return String|array: The code of the fallback language or the
 139          *                               main code if there is no fallback
 140          */
 141         public function getVariantFallbacks( $variant ) {
 142                 if ( isset( $this->mVariantFallbacks[$variant] ) ) {
 143                         return $this->mVariantFallbacks[$variant];
 144                 }
 145                 return $this->mMainLanguageCode;
 146         }
 147
 148         /**
 149          * Get the title produced by the conversion rule.
 150          * @return String: The converted title text
 151          */
 152         public function getConvRuleTitle() {
 153                 return $this->mConvRuleTitle;
 154         }
 155
 156         /**
 157          * Get preferred language variant.
 158          * @return String: the preferred language code
 159          */
 160         public function getPreferredVariant() {
 161                 global $wgDefaultLanguageVariant, $wgUser;
 162
 163                 $req = $this->getURLVariant();
 164
 165                 if ( $wgUser->isLoggedIn() && !$req ) {
 166                         $req = $this->getUserVariant();
 167                 } elseif ( !$req ) {
 168                         $req = $this->getHeaderVariant();
 169                 }
 170
 171                 if ( $wgDefaultLanguageVariant && !$req ) {
 172                         $req = $this->validateVariant( $wgDefaultLanguageVariant );
 173                 }
 174
 175                 // This function, unlike the other get*Variant functions, is
 176                 // not memoized (i.e. there return value is not cached) since
 177                 // new information might appear during processing after this
 178                 // is first called.
 179                 if ( $this->validateVariant( $req ) ) {
 180                         return $req;
 181                 }
 182                 return $this->mMainLanguageCode;
 183         }
 184
 185         /**
 186          * Get default variant.
 187          * This function would not be affected by user's settings
 188          * @return String: the default variant code
 189          */
 190         public function getDefaultVariant() {
 191                 global $wgDefaultLanguageVariant;
 192
 193                 $req = $this->getURLVariant();
 194
 195                 if ( !$req ) {
 196                         $req = $this->getHeaderVariant();
 197                 }
 198
 199                 if ( $wgDefaultLanguageVariant && !$req ) {
 200                         $req = $this->validateVariant( $wgDefaultLanguageVariant );
 201                 }
 202
 203                 if ( $req ) {
 204                         return $req;
 205                 }
 206                 return $this->mMainLanguageCode;
 207         }
 208
 209         /**
 210          * Validate the variant
 211          * @param $variant String: the variant to validate
 212          * @return Mixed: returns the variant if it is valid, null otherwise
 213          */
 214         public function validateVariant( $variant = null ) {
 215                 if ( $variant !== null && in_array( $variant, $this->mVariants ) ) {
 216                         return $variant;
 217                 }
 218                 return null;
 219         }
 220
 221         /**
 222          * Get the variant specified in the URL
 223          *
 224          * @return Mixed: variant if one found, false otherwise.
 225          */
 226         public function getURLVariant() {
 227                 global $wgRequest;
 228
 229                 if ( $this->mURLVariant ) {
 230                         return $this->mURLVariant;
 231                 }
 232
 233                 // see if the preference is set in the request
 234                 $ret = $wgRequest->getText( 'variant' );
 235
 236                 if ( !$ret ) {
 237                         $ret = $wgRequest->getVal( 'uselang' );
 238                 }
 239
 240                 return $this->mURLVariant = $this->validateVariant( $ret );
 241         }
 242
 243         /**
 244          * Determine if the user has a variant set.
 245          *
 246          * @return Mixed: variant if one found, false otherwise.
 247          */
 248         protected function getUserVariant() {
 249                 global $wgUser;
 250
 251                 // memoizing this function wreaks havoc on parserTest.php
 252                 /*
 253                 if ( $this->mUserVariant ) {
 254                         return $this->mUserVariant;
 255                 }
 256                 */
 257
 258                 // Get language variant preference from logged in users
 259                 // Don't call this on stub objects because that causes infinite
 260                 // recursion during initialisation
 261                 if ( $wgUser->isLoggedIn() )  {
 262                         $ret = $wgUser->getOption( 'variant' );
 263                 } else {
 264                         // figure out user lang without constructing wgLang to avoid
 265                         // infinite recursion
 266                         $ret = $wgUser->getOption( 'language' );
 267                 }
 268
 269                 return $this->mUserVariant = $this->validateVariant( $ret );
 270         }
 271
 272         /**
 273          * Determine the language variant from the Accept-Language header.
 274          *
 275          * @return Mixed: variant if one found, false otherwise.
 276          */
 277         protected function getHeaderVariant() {
 278                 global $wgRequest;
 279
 280                 if ( $this->mHeaderVariant ) {
 281                         return $this->mHeaderVariant;
 282                 }
 283
 284                 // see if some supported language variant is set in the
 285                 // HTTP header.
 286                 $languages = array_keys( $wgRequest->getAcceptLang() );
 287                 if ( empty( $languages ) ) {
 288                         return null;
 289                 }
 290
 291                 $fallbackLanguages = array();
 292                 foreach ( $languages as $language ) {
 293                         $this->mHeaderVariant = $this->validateVariant( $language );
 294                         if ( $this->mHeaderVariant ) {
 295                                 break;
 296                         }
 297
 298                         // To see if there are fallbacks of current language.
 299                         // We record these fallback variants, and process
 300                         // them later.
 301                         $fallbacks = $this->getVariantFallbacks( $language );
 302                         if ( is_string( $fallbacks ) && $fallbacks !== $this->mMainLanguageCode ) {
 303                                 $fallbackLanguages[] = $fallbacks;
 304                         } elseif ( is_array( $fallbacks ) ) {
 305                                 $fallbackLanguages =
 306                                         array_merge( $fallbackLanguages, $fallbacks );
 307                         }
 308                 }
 309
 310                 if ( !$this->mHeaderVariant ) {
 311                         // process fallback languages now
 312                         $fallback_languages = array_unique( $fallbackLanguages );
 313                         foreach ( $fallback_languages as $language ) {
 314                                 $this->mHeaderVariant = $this->validateVariant( $language );
 315                                 if ( $this->mHeaderVariant ) {
 316                                         break;
 317                                 }
 318                         }
 319                 }
 320
 321                 return $this->mHeaderVariant;
 322         }
 323
 324         /**
 325          * Dictionary-based conversion.
 326          * This function would not parse the conversion rules.
 327          * If you want to parse rules, try to use convert() or
 328          * convertTo().
 329          *
 330          * @param $text String the text to be converted
 331          * @param $toVariant bool|string the target language code
 332          * @return String the converted text
 333          */
 334         public function autoConvert( $text, $toVariant = false ) {
 335                 wfProfileIn( __METHOD__ );
 336
 337                 $this->loadTables();
 338
 339                 if ( !$toVariant ) {
 340                         $toVariant = $this->getPreferredVariant();
 341                         if ( !$toVariant ) {
 342                                 wfProfileOut( __METHOD__ );
 343                                 return $text;
 344                         }
 345                 }
 346
 347                 if( $this->guessVariant( $text, $toVariant ) ) {
 348                         wfProfileOut( __METHOD__ );
 349                         return $text;
 350                 }
 351
 352                 /* we convert everything except:
 353                    1. HTML markups (anything between < and >)
 354                    2. HTML entities
 355                    3. placeholders created by the parser
 356                 */
 357                 global $wgParser;
 358                 if ( isset( $wgParser ) && $wgParser->UniqPrefix() != '' ) {
 359                         $marker = '|' . $wgParser->UniqPrefix() . '[\-a-zA-Z0-9]+';
 360                 } else {
 361                         $marker = '';
 362                 }
 363
 364                 // this one is needed when the text is inside an HTML markup
 365                 $htmlfix = '|<[^>]+$|^[^<>]*>';
 366
 367                 // disable convert to variants between <code></code> tags
 368                 $codefix = '<code>.+?<\/code>|';
 369                 // disable convertsion of <script type="text/javascript"> ... </script>
 370                 $scriptfix = '<script.*?>.*?<\/script>|';
 371                 // disable conversion of <pre xxxx> ... </pre>
 372                 $prefix = '<pre.*?>.*?<\/pre>|';
 373
 374                 $reg = '/' . $codefix . $scriptfix . $prefix .
 375                         '<[^>]+>|&[a-zA-Z#][a-z0-9]+;' . $marker . $htmlfix . '/s';
 376                 $startPos = 0;
 377                 $sourceBlob = '';
 378                 $literalBlob = '';
 379
 380                 // Guard against delimiter nulls in the input
 381                 $text = str_replace( "\000", '', $text );
 382
 383                 $markupMatches = null;
 384                 $elementMatches = null;
 385                 while ( $startPos < strlen( $text ) ) {
 386                         if ( preg_match( $reg, $text, $markupMatches, PREG_OFFSET_CAPTURE, $startPos ) ) {
 387                                 $elementPos = $markupMatches[0][1];
 388                                 $element = $markupMatches[0][0];
 389                         } else {
 390                                 $elementPos = strlen( $text );
 391                                 $element = '';
 392                         }
 393
 394                         // Queue the part before the markup for translation in a batch
 395                         $sourceBlob .= substr( $text, $startPos, $elementPos - $startPos ) . "\000";
 396
 397                         // Advance to the next position
 398                         $startPos = $elementPos + strlen( $element );
 399
 400                         // Translate any alt or title attributes inside the matched element
 401                         if ( $element !== '' && preg_match( '/^(<[^>\s]*)\s([^>]*)(.*)$/', $element,
 402                                 $elementMatches ) )
 403                         {
 404                                 $attrs = Sanitizer::decodeTagAttributes( $elementMatches[2] );
 405                                 $changed = false;
 406                                 foreach ( array( 'title', 'alt' ) as $attrName ) {
 407                                         if ( !isset( $attrs[$attrName] ) ) {
 408                                                 continue;
 409                                         }
 410                                         $attr = $attrs[$attrName];
 411                                         // Don't convert URLs
 412                                         if ( !strpos( $attr, '://' ) ) {
 413                                                 $attr = $this->translate( $attr, $toVariant );
 414                                         }
 415
 416                                         // Remove HTML tags to avoid disrupting the layout
 417                                         $attr = preg_replace( '/<[^>]+>/', '', $attr );
 418                                         if ( $attr !== $attrs[$attrName] ) {
 419                                                 $attrs[$attrName] = $attr;
 420                                                 $changed = true;
 421                                         }
 422                                 }
 423                                 if ( $changed ) {
 424                                         $element = $elementMatches[1] . Html::expandAttributes( $attrs ) .
 425                                                 $elementMatches[3];
 426                                 }
 427                         }
 428                         $literalBlob .= $element . "\000";
 429                 }
 430
 431                 // Do the main translation batch
 432                 $translatedBlob = $this->translate( $sourceBlob, $toVariant );
 433
 434                 // Put the output back together
 435                 $translatedIter = StringUtils::explode( "\000", $translatedBlob );
 436                 $literalIter = StringUtils::explode( "\000", $literalBlob );
 437                 $output = '';
 438                 while ( $translatedIter->valid() && $literalIter->valid() ) {
 439                         $output .= $translatedIter->current();
 440                         $output .= $literalIter->current();
 441                         $translatedIter->next();
 442                         $literalIter->next();
 443                 }
 444
 445                 wfProfileOut( __METHOD__ );
 446                 return $output;
 447         }
 448
 449         /**
 450          * Translate a string to a variant.
 451          * Doesn't parse rules or do any of that other stuff, for that use
 452          * convert() or convertTo().
 453          *
 454          * @param $text String: text to convert
 455          * @param $variant String: variant language code
 456          * @return String: translated text
 457          */
 458         public function translate( $text, $variant ) {
 459                 wfProfileIn( __METHOD__ );
 460                 // If $text is empty or only includes spaces, do nothing
 461                 // Otherwise translate it
 462                 if ( trim( $text ) ) {
 463                         $this->loadTables();
 464                         $text = $this->mTables[$variant]->replace( $text );
 465                 }
 466                 wfProfileOut( __METHOD__ );
 467                 return $text;
 468         }
 469
 470         /**
 471          * Call translate() to convert text to all valid variants.
 472          *
 473          * @param $text String: the text to be converted
 474          * @return Array: variant => converted text
 475          */
 476         public function autoConvertToAllVariants( $text ) {
 477                 wfProfileIn( __METHOD__ );
 478                 $this->loadTables();
 479
 480                 $ret = array();
 481                 foreach ( $this->mVariants as $variant ) {
 482                         $ret[$variant] = $this->translate( $text, $variant );
 483                 }
 484
 485                 wfProfileOut( __METHOD__ );
 486                 return $ret;
 487         }
 488
 489         /**
 490          * Convert link text to all valid variants.
 491          * In the first, this function only convert text outside the
 492          * "-{" "}-" markups. Since the "{" and "}" are not allowed in
 493          * titles, the text will get all converted always.
 494          * So I removed this feature and deprecated the function.
 495          *
 496          * @param $text String: the text to be converted
 497          * @return Array: variant => converted text
 498          * @deprecated since 1.17 Use autoConvertToAllVariants() instead
 499          */
 500         public function convertLinkToAllVariants( $text ) {
 501                 return $this->autoConvertToAllVariants( $text );
 502         }
 503
 504         /**
 505          * Apply manual conversion rules.
 506          *
 507          * @param $convRule ConverterRule Object of ConverterRule
 508          */
 509         protected function applyManualConv( $convRule ) {
 510                 // Use syntax -{T|zh-cn:TitleCN; zh-tw:TitleTw}- to custom
 511                 // title conversion.
 512                 // Bug 24072: $mConvRuleTitle was overwritten by other manual
 513                 // rule(s) not for title, this breaks the title conversion.
 514                 $newConvRuleTitle = $convRule->getTitle();
 515                 if ( $newConvRuleTitle ) {
 516                         // So I add an empty check for getTitle()
 517                         $this->mConvRuleTitle = $newConvRuleTitle;
 518                 }
 519
 520                 // merge/remove manual conversion rules to/from global table
 521                 $convTable = $convRule->getConvTable();
 522                 $action = $convRule->getRulesAction();
 523                 foreach ( $convTable as $variant => $pair ) {
 524                         if ( !$this->validateVariant( $variant ) ) {
 525                                 continue;
 526                         }
 527
 528                         if ( $action == 'add' ) {
 529                                 foreach ( $pair as $from => $to ) {
 530                                         // to ensure that $from and $to not be left blank
 531                                         // so $this->translate() could always return a string
 532                                         if ( $from || $to ) {
 533                                                 // more efficient than array_merge(), about 2.5 times.
 534                                                 $this->mTables[$variant]->setPair( $from, $to );
 535                                         }
 536                                 }
 537                         } elseif ( $action == 'remove' ) {
 538                                 $this->mTables[$variant]->removeArray( $pair );
 539                         }
 540                 }
 541         }
 542
 543         /**
 544          * Auto convert a Title object to a readable string in the
 545          * preferred variant.
 546          *
 547          * @param $title Title a object of Title
 548          * @return String: converted title text
 549          */
 550         public function convertTitle( $title ) {
 551                 $variant = $this->getPreferredVariant();
 552                 $index = $title->getNamespace();
 553                 if ( $index === NS_MAIN ) {
 554                         $text = '';
 555                 } else {
 556                         // first let's check if a message has given us a converted name
 557                         $nsConvMsg = wfMessage( 'conversion-ns' . $index )->inContentLanguage();
 558                         if ( $nsConvMsg->exists() ) {
 559                                 $text = $nsConvMsg->plain();
 560                         } else {
 561                                 // the message does not exist, try retrieve it from the current
 562                                 // variant's namespace names.
 563                                 $langObj = $this->mLangObj->factory( $variant );
 564                                 $text = $langObj->getFormattedNsText( $index );
 565                         }
 566                         $text .= ':';
 567                 }
 568                 $text .= $title->getText();
 569                 $text = $this->translate( $text, $variant );
 570                 return $text;
 571         }
 572
 573         /**
 574          * Convert text to different variants of a language. The automatic
 575          * conversion is done in autoConvert(). Here we parse the text
 576          * marked with -{}-, which specifies special conversions of the
 577          * text that can not be accomplished in autoConvert().
 578          *
 579          * Syntax of the markup:
 580          * -{code1:text1;code2:text2;...}-  or
 581          * -{flags|code1:text1;code2:text2;...}-  or
 582          * -{text}- in which case no conversion should take place for text
 583          *
 584          * @param $text String: text to be converted
 585          * @return String: converted text
 586          */
 587         public function convert( $text ) {
 588                 $variant = $this->getPreferredVariant();
 589                 return $this->convertTo( $text, $variant );
 590         }
 591
 592         /**
 593          * Same as convert() except a extra parameter to custom variant.
 594          *
 595          * @param $text String: text to be converted
 596          * @param $variant String: the target variant code
 597          * @return String: converted text
 598          */
 599         public function convertTo( $text, $variant ) {
 600                 global $wgDisableLangConversion;
 601                 if ( $wgDisableLangConversion ) {
 602                         return $text;
 603                 }
 604                 return $this->recursiveConvertTopLevel( $text, $variant );
 605         }
 606
 607         /**
 608          * Recursively convert text on the outside. Allow to use nested
 609          * markups to custom rules.
 610          *
 611          * @param $text String: text to be converted
 612          * @param $variant String: the target variant code
 613          * @param $depth Integer: depth of recursion
 614          * @return String: converted text
 615          */
 616         protected function recursiveConvertTopLevel( $text, $variant, $depth = 0 ) {
 617                 $startPos = 0;
 618                 $out = '';
 619                 $length = strlen( $text );
 620                 $shouldConvert = !$this->guessVariant( $text, $variant );
 621
 622                 while ( $startPos < $length ) {
 623                         $pos = strpos( $text, '-{', $startPos );
 624
 625                         if ( $pos === false ) {
 626                                 // No more markup, append final segment
 627                                 $fragment = substr( $text, $startPos );
 628                                 $out .= $shouldConvert? $this->autoConvert( $fragment, $variant ): $fragment;
 629                                 return $out;
 630                         }
 631
 632                         // Markup found
 633                         // Append initial segment
 634                         $fragment = substr( $text, $startPos, $pos - $startPos );
 635                         $out .= $shouldConvert? $this->autoConvert( $fragment, $variant ): $fragment;
 636
 637                         // Advance position
 638                         $startPos = $pos;
 639
 640                         // Do recursive conversion
 641                         $out .= $this->recursiveConvertRule( $text, $variant, $startPos, $depth + 1 );
 642                 }
 643
 644                 return $out;
 645         }
 646
 647         /**
 648          * Recursively convert text on the inside.
 649          *
 650          * @param $text String: text to be converted
 651          * @param $variant String: the target variant code
 652          * @param $startPos int
 653          * @param $depth Integer: depth of recursion
 654          *
 655          * @throws MWException
 656          * @return String: converted text
 657          */
 658         protected function recursiveConvertRule( $text, $variant, &$startPos, $depth = 0 ) {
 659                 // Quick sanity check (no function calls)
 660                 if ( $text[$startPos] !== '-' || $text[$startPos + 1] !== '{' ) {
 661                         throw new MWException( __METHOD__ . ': invalid input string' );
 662                 }
 663
 664                 $startPos += 2;
 665                 $inner = '';
 666                 $warningDone = false;
 667                 $length = strlen( $text );
 668
 669                 while ( $startPos < $length ) {
 670                         $m = false;
 671                         preg_match( '/-\{|\}-/', $text, $m,  PREG_OFFSET_CAPTURE, $startPos );
 672                         if ( !$m ) {
 673                                 // Unclosed rule
 674                                 break;
 675                         }
 676
 677                         $token = $m[0][0];
 678                         $pos = $m[0][1];
 679
 680                         // Markup found
 681                         // Append initial segment
 682                         $inner .= substr( $text, $startPos, $pos - $startPos );
 683
 684                         // Advance position
 685                         $startPos = $pos;
 686
 687                         switch ( $token ) {
 688                                 case '-{':
 689                                         // Check max depth
 690                                         if ( $depth >= $this->mMaxDepth ) {
 691                                                 $inner .= '-{';
 692                                                 if ( !$warningDone ) {
 693                                                         $inner .= '<span class="error">' .
 694                                                                 wfMessage( 'language-converter-depth-warning' )
 695                                                                         ->numParams( $this->mMaxDepth )->inContentLanguage()->text() .
 696                                                                 '</span>';
 697                                                         $warningDone = true;
 698                                                 }
 699                                                 $startPos += 2;
 700                                                 continue;
 701                                         }
 702                                         // Recursively parse another rule
 703                                         $inner .= $this->recursiveConvertRule( $text, $variant, $startPos, $depth + 1 );
 704                                         break;
 705                                 case '}-':
 706                                         // Apply the rule
 707                                         $startPos += 2;
 708                                         $rule = new ConverterRule( $inner, $this );
 709                                         $rule->parse( $variant );
 710                                         $this->applyManualConv( $rule );
 711                                         return $rule->getDisplay();
 712                                 default:
 713                                         throw new MWException( __METHOD__ . ': invalid regex match' );
 714                         }
 715                 }
 716
 717                 // Unclosed rule
 718                 if ( $startPos < $length ) {
 719                         $inner .= substr( $text, $startPos );
 720                 }
 721                 $startPos = $length;
 722                 return '-{' . $this->autoConvert( $inner, $variant );
 723         }
 724
 725         /**
 726          * If a language supports multiple variants, it is possible that
 727          * non-existing link in one variant actually exists in another variant.
 728          * This function tries to find it. See e.g. LanguageZh.php
 729          *
 730          * @param $link String: the name of the link
 731          * @param $nt Mixed: the title object of the link
 732          * @param $ignoreOtherCond Boolean: to disable other conditions when
 733          *              we need to transclude a template or update a category's link
 734          * @return Null, the input parameters may be modified upon return
 735          */
 736         public function findVariantLink( &$link, &$nt, $ignoreOtherCond = false ) {
 737                 # If the article has already existed, there is no need to
 738                 # check it again, otherwise it may cause a fault.
 739                 if ( is_object( $nt ) && $nt->exists() ) {
 740                         return;
 741                 }
 742
 743                 global $wgDisableLangConversion, $wgDisableTitleConversion, $wgRequest,
 744                         $wgUser;
 745                 $isredir = $wgRequest->getText( 'redirect', 'yes' );
 746                 $action = $wgRequest->getText( 'action' );
 747                 $linkconvert = $wgRequest->getText( 'linkconvert', 'yes' );
 748                 $disableLinkConversion = $wgDisableLangConversion
 749                         || $wgDisableTitleConversion;
 750                 $linkBatch = new LinkBatch();
 751
 752                 $ns = NS_MAIN;
 753
 754                 if ( $disableLinkConversion ||
 755                          ( !$ignoreOtherCond &&
 756                            ( $isredir == 'no'
 757                                  || $action == 'edit'
 758                                  || $action == 'submit'
 759                                  || $linkconvert == 'no'
 760                                  || $wgUser->getOption( 'noconvertlink' ) == 1 ) ) ) {
 761                         return;
 762                 }
 763
 764                 if ( is_object( $nt ) ) {
 765                         $ns = $nt->getNamespace();
 766                 }
 767
 768                 $variants = $this->autoConvertToAllVariants( $link );
 769                 if ( !$variants ) { // give up
 770                         return;
 771                 }
 772
 773                 $titles = array();
 774
 775                 foreach ( $variants as $v ) {
 776                         if ( $v != $link ) {
 777                                 $varnt = Title::newFromText( $v, $ns );
 778                                 if ( !is_null( $varnt ) ) {
 779                                         $linkBatch->addObj( $varnt );
 780                                         $titles[] = $varnt;
 781                                 }
 782                         }
 783                 }
 784
 785                 // fetch all variants in single query
 786                 $linkBatch->execute();
 787
 788                 foreach ( $titles as $varnt ) {
 789                         if ( $varnt->getArticleID() > 0 ) {
 790                                 $nt = $varnt;
 791                                 $link = $varnt->getText();
 792                                 break;
 793                         }
 794                 }
 795         }
 796
 797         /**
 798          * Returns language specific hash options.
 799          *
 800          * @return string
 801          */
 802         public function getExtraHashOptions() {
 803                 $variant = $this->getPreferredVariant();
 804                 return '!' . $variant;
 805         }
 806
 807         /**
 808          * Guess if a text is written in a variant. This should be implemented in subclasses.
 809          *
 810          * @param string        $text the text to be checked
 811          * @param string        $variant language code of the variant to be checked for
 812          * @return bool true if $text appears to be written in $variant, false if not
 813          *
 814          * @author Nikola Smolenski <smolensk@eunet.rs>
 815          * @since 1.19
 816          */
 817         public function guessVariant($text, $variant) {
 818                 return false;
 819         }
 820
 821         /**
 822          * Load default conversion tables.
 823          * This method must be implemented in derived class.
 824          *
 825          * @private
 826          * @throws MWException
 827          */
 828         function loadDefaultTables() {
 829                 $name = get_class( $this );
 830                 throw new MWException( "Must implement loadDefaultTables() method in class $name" );
 831         }
 832
 833         /**
 834          * Load conversion tables either from the cache or the disk.
 835          * @private
 836          * @param $fromCache Boolean: load from memcached? Defaults to true.
 837          */
 838         function loadTables( $fromCache = true ) {
 839                 global $wgLangConvMemc;
 840
 841                 if ( $this->mTablesLoaded ) {
 842                         return;
 843                 }
 844
 845                 wfProfileIn( __METHOD__ );
 846                 $this->mTablesLoaded = true;
 847                 $this->mTables = false;
 848                 if ( $fromCache ) {
 849                         wfProfileIn( __METHOD__ . '-cache' );
 850                         $this->mTables = $wgLangConvMemc->get( $this->mCacheKey );
 851                         wfProfileOut( __METHOD__ . '-cache' );
 852                 }
 853                 if ( !$this->mTables
 854                          || !array_key_exists( self::CACHE_VERSION_KEY, $this->mTables ) ) {
 855                         wfProfileIn( __METHOD__ . '-recache' );
 856                         // not in cache, or we need a fresh reload.
 857                         // We will first load the default tables
 858                         // then update them using things in MediaWiki:Conversiontable/*
 859                         $this->loadDefaultTables();
 860                         foreach ( $this->mVariants as $var ) {
 861                                 $cached = $this->parseCachedTable( $var );
 862                                 $this->mTables[$var]->mergeArray( $cached );
 863                         }
 864
 865                         $this->postLoadTables();
 866                         $this->mTables[self::CACHE_VERSION_KEY] = true;
 867
 868                         $wgLangConvMemc->set( $this->mCacheKey, $this->mTables, 43200 );
 869                         wfProfileOut( __METHOD__ . '-recache' );
 870                 }
 871                 wfProfileOut( __METHOD__ );
 872         }
 873
 874         /**
 875          * Hook for post processing after conversion tables are loaded.
 876          */
 877         function postLoadTables() { }
 878
 879         /**
 880          * Reload the conversion tables.
 881          *
 882          * @private
 883          */
 884         function reloadTables() {
 885                 if ( $this->mTables ) {
 886                         unset( $this->mTables );
 887                 }
 888                 $this->mTablesLoaded = false;
 889                 $this->loadTables( false );
 890         }
 891
 892         /**
 893          * Parse the conversion table stored in the cache.
 894          *
 895          * The tables should be in blocks of the following form:
 896          *              -{
 897          *                      word => word ;
 898          *                      word => word ;
 899          *                      ...
 900          *              }-
 901          *
 902          * To make the tables more manageable, subpages are allowed
 903          * and will be parsed recursively if $recursive == true.
 904          *
 905          * @param $code String: language code
 906          * @param $subpage String: subpage name
 907          * @param $recursive Boolean: parse subpages recursively? Defaults to true.
 908          *
 909          * @return array
 910          */
 911         function parseCachedTable( $code, $subpage = '', $recursive = true ) {
 912                 static $parsed = array();
 913
 914                 $key = 'Conversiontable/' . $code;
 915                 if ( $subpage ) {
 916                         $key .= '/' . $subpage;
 917                 }
 918                 if ( array_key_exists( $key, $parsed ) ) {
 919                         return array();
 920                 }
 921
 922                 $parsed[$key] = true;
 923
 924                 if ( $subpage === '' ) {
 925                         $txt = MessageCache::singleton()->get( 'conversiontable', true, $code );
 926                 } else {
 927                         $txt = false;
 928                         $title = Title::makeTitleSafe( NS_MEDIAWIKI, $key );
 929                         if ( $title && $title->exists() ) {
 930                                 $revision = Revision::newFromTitle( $title );
 931                                 if ( $revision ) {
 932                                         if ( $revision->getContentModel() == CONTENT_MODEL_WIKITEXT ) {
 933                                                 $txt = $revision->getContent( Revision::RAW )->getNativeData();
 934                                         }
 935
 936                                         //@todo: in the future, use a specialized content model, perhaps based on json!
 937                                 }
 938                         }
 939                 }
 940
 941                 # Nothing to parse if there's no text
 942                 if ( $txt === false || $txt === null || $txt === '' ) {
 943                         return array();
 944                 }
 945
 946                 // get all subpage links of the form
 947                 // [[MediaWiki:Conversiontable/zh-xx/...|...]]
 948                 $linkhead = $this->mLangObj->getNsText( NS_MEDIAWIKI ) .
 949                         ':Conversiontable';
 950                 $subs = StringUtils::explode( '[[', $txt );
 951                 $sublinks = array();
 952                 foreach ( $subs as $sub ) {
 953                         $link = explode( ']]', $sub, 2 );
 954                         if ( count( $link ) != 2 ) {
 955                                 continue;
 956                         }
 957                         $b = explode( '|', $link[0], 2 );
 958                         $b = explode( '/', trim( $b[0] ), 3 );
 959                         if ( count( $b ) == 3 ) {
 960                                 $sublink = $b[2];
 961                         } else {
 962                                 $sublink = '';
 963                         }
 964
 965                         if ( $b[0] == $linkhead && $b[1] == $code ) {
 966                                 $sublinks[] = $sublink;
 967                         }
 968                 }
 969
 970                 // parse the mappings in this page
 971                 $blocks = StringUtils::explode( '-{', $txt );
 972                 $ret = array();
 973                 $first = true;
 974                 foreach ( $blocks as $block ) {
 975                         if ( $first ) {
 976                                 // Skip the part before the first -{
 977                                 $first = false;
 978                                 continue;
 979                         }
 980                         $mappings = explode( '}-', $block, 2 );
 981                         $stripped = str_replace( array( "'", '"', '*', '#' ), '',
 982                                                                          $mappings[0] );
 983                         $table = StringUtils::explode( ';', $stripped );
 984                         foreach ( $table as $t ) {
 985                                 $m = explode( '=>', $t, 3 );
 986                                 if ( count( $m ) != 2 ) {
 987                                         continue;
 988                                 }
 989                                 // trim any trailling comments starting with '//'
 990                                 $tt = explode( '//', $m[1], 2 );
 991                                 $ret[trim( $m[0] )] = trim( $tt[0] );
 992                         }
 993                 }
 994
 995                 // recursively parse the subpages
 996                 if ( $recursive ) {
 997                         foreach ( $sublinks as $link ) {
 998                                 $s = $this->parseCachedTable( $code, $link, $recursive );
 999                                 $ret = array_merge( $ret, $s );
1000                         }
1001                 }
1002
1003                 if ( $this->mUcfirst ) {
1004                         foreach ( $ret as $k => $v ) {
1005                                 $ret[$this->mLangObj->ucfirst( $k )] = $this->mLangObj->ucfirst( $v );
1006                         }
1007                 }
1008                 return $ret;
1009         }
1010
1011         /**
1012          * Enclose a string with the "no conversion" tag. This is used by
1013          * various functions in the Parser.
1014          *
1015          * @param $text String: text to be tagged for no conversion
1016          * @param $noParse Boolean: unused
1017          * @return String: the tagged text
1018          */
1019         public function markNoConversion( $text, $noParse = false ) {
1020                 # don't mark if already marked
1021                 if ( strpos( $text, '-{' ) || strpos( $text, '}-' ) ) {
1022                         return $text;
1023                 }
1024
1025                 $ret = "-{R|$text}-";
1026                 return $ret;
1027         }
1028
1029         /**
1030          * Convert the sorting key for category links. This should make different
1031          * keys that are variants of each other map to the same key.
1032          *
1033          * @param $key string
1034          *
1035          * @return string
1036          */
1037         function convertCategoryKey( $key ) {
1038                 return $key;
1039         }
1040
1041         /**
1042          * Hook to refresh the cache of conversion tables when
1043          * MediaWiki:Conversiontable* is updated.
1044          * @private
1045          *
1046          * @param $page WikiPage object
1047          * @param $user Object: User object for the current user
1048          * @param $content Content: new page content
1049          * @param $summary String: edit summary of the edit
1050          * @param $isMinor Boolean: was the edit marked as minor?
1051          * @param $isWatch Boolean: did the user watch this page or not?
1052          * @param $section
1053          * @param $flags int Bitfield
1054          * @param $revision Object: new Revision object or null
1055          * @return Boolean: true
1056          */
1057         function OnArticleContentSaveComplete( $page, $user, $content, $summary, $isMinor,
1058                         $isWatch, $section, $flags, $revision ) {
1059                 $titleobj = $page->getTitle();
1060                 if ( $titleobj->getNamespace() == NS_MEDIAWIKI ) {
1061                         $title = $titleobj->getDBkey();
1062                         $t = explode( '/', $title, 3 );
1063                         $c = count( $t );
1064                         if ( $c > 1 && $t[0] == 'Conversiontable' ) {
1065                                 if ( $this->validateVariant( $t[1] ) ) {
1066                                         $this->reloadTables();
1067                                 }
1068                         }
1069                 }
1070                 return true;
1071         }
1072
1073         /**
1074          * Armour rendered math against conversion.
1075          * Escape special chars in parsed math text. (in most cases are img elements)
1076          *
1077          * @param $text String: text to armour against conversion
1078          * @return String: armoured text where { and } have been converted to
1079          *                 &#123; and &#125;
1080          */
1081         public function armourMath( $text ) {
1082                 // convert '-{' and '}-' to '-&#123;' and '&#125;-' to prevent
1083                 // any unwanted markup appearing in the math image tag.
1084                 $text = strtr( $text, array( '-{' => '-&#123;', '}-' => '&#125;-' ) );
1085                 return $text;
1086         }
1087
1088         /**
1089          * Get the cached separator pattern for ConverterRule::parseRules()
1090          */
1091         function getVarSeparatorPattern() {
1092                 if ( is_null( $this->mVarSeparatorPattern ) ) {
1093                         // varsep_pattern for preg_split:
1094                         // text should be splited by ";" only if a valid variant
1095                         // name exist after the markup, for example:
1096                         //  -{zh-hans:<span style="font-size:120%;">xxx</span>;zh-hant:\
1097                         //      <span style="font-size:120%;">yyy</span>;}-
1098                         // we should split it as:
1099                         //  array(
1100                         //        [0] => 'zh-hans:<span style="font-size:120%;">xxx</span>'
1101                         //        [1] => 'zh-hant:<span style="font-size:120%;">yyy</span>'
1102                         //        [2] => ''
1103                         //       )
1104                         $pat = '/;\s*(?=';
1105                         foreach ( $this->mVariants as $variant ) {
1106                                 // zh-hans:xxx;zh-hant:yyy
1107                                 $pat .= $variant . '\s*:|';
1108                                 // xxx=>zh-hans:yyy; xxx=>zh-hant:zzz
1109                                 $pat .= '[^;]*?=>\s*' . $variant . '\s*:|';
1110                         }
1111                         $pat .= '\s*$)/';
1112                         $this->mVarSeparatorPattern = $pat;
1113                 }
1114                 return $this->mVarSeparatorPattern;
1115         }
1116 }
1117
1118 /**
1119  * Parser for rules of language conversion , parse rules in -{ }- tag.
1120  * @ingroup Language
1121  * @author fdcn <fdcn64@gmail.com>, PhiLiP <philip.npc@gmail.com>
1122  */
1123 class ConverterRule {
1124         public $mText; // original text in -{text}-
1125         public $mConverter; // LanguageConverter object
1126         public $mRuleDisplay = '';
1127         public $mRuleTitle = false;
1128         public $mRules = '';// string : the text of the rules
1129         public $mRulesAction = 'none';
1130         public $mFlags = array();
1131         public $mVariantFlags = array();
1132         public $mConvTable = array();
1133         public $mBidtable = array();// array of the translation in each variant
1134         public $mUnidtable = array();// array of the translation in each variant
1135
1136         /**
1137          * Constructor
1138          *
1139          * @param $text String: the text between -{ and }-
1140          * @param $converter LanguageConverter object
1141          */
1142         public function __construct( $text, $converter ) {
1143                 $this->mText = $text;
1144                 $this->mConverter = $converter;
1145         }
1146
1147         /**
1148          * Check if variants array in convert array.
1149          *
1150          * @param $variants Array or string: variant language code
1151          * @return String: translated text
1152          */
1153         public function getTextInBidtable( $variants ) {
1154                 $variants = (array)$variants;
1155                 if ( !$variants ) {
1156                         return false;
1157                 }
1158                 foreach ( $variants as $variant ) {
1159                         if ( isset( $this->mBidtable[$variant] ) ) {
1160                                 return $this->mBidtable[$variant];
1161                         }
1162                 }
1163                 return false;
1164         }
1165
1166         /**
1167          * Parse flags with syntax -{FLAG| ... }-
1168          * @private
1169          */
1170         function parseFlags() {
1171                 $text = $this->mText;
1172                 $flags = array();
1173                 $variantFlags = array();
1174
1175                 $sepPos = strpos( $text, '|' );
1176                 if ( $sepPos !== false ) {
1177                         $validFlags = $this->mConverter->mFlags;
1178                         $f = StringUtils::explode( ';', substr( $text, 0, $sepPos ) );
1179                         foreach ( $f as $ff ) {
1180                                 $ff = trim( $ff );
1181                                 if ( isset( $validFlags[$ff] ) ) {
1182                                         $flags[$validFlags[$ff]] = true;
1183                                 }
1184                         }
1185                         $text = strval( substr( $text, $sepPos + 1 ) );
1186                 }
1187
1188                 if ( !$flags ) {
1189                         $flags['S'] = true;
1190                 } elseif ( isset( $flags['R'] ) ) {
1191                         $flags = array( 'R' => true );// remove other flags
1192                 } elseif ( isset( $flags['N'] ) ) {
1193                         $flags = array( 'N' => true );// remove other flags
1194                 } elseif ( isset( $flags['-'] ) ) {
1195                         $flags = array( '-' => true );// remove other flags
1196                 } elseif ( count( $flags ) == 1 && isset( $flags['T'] ) ) {
1197                         $flags['H'] = true;
1198                 } elseif ( isset( $flags['H'] ) ) {
1199                         // replace A flag, and remove other flags except T
1200                         $temp = array( '+' => true, 'H' => true );
1201                         if ( isset( $flags['T'] ) ) {
1202                                 $temp['T'] = true;
1203                         }
1204                         if ( isset( $flags['D'] ) ) {
1205                                 $temp['D'] = true;
1206                         }
1207                         $flags = $temp;
1208                 } else {
1209                         if ( isset( $flags['A'] ) ) {
1210                                 $flags['+'] = true;
1211                                 $flags['S'] = true;
1212                         }
1213                         if ( isset( $flags['D'] ) ) {
1214                                 unset( $flags['S'] );
1215                         }
1216                         // try to find flags like "zh-hans", "zh-hant"
1217                         // allow syntaxes like "-{zh-hans;zh-hant|XXXX}-"
1218                         $variantFlags = array_intersect( array_keys( $flags ), $this->mConverter->mVariants );
1219                         if ( $variantFlags ) {
1220                                 $variantFlags = array_flip( $variantFlags );
1221                                 $flags = array();
1222                         }
1223                 }
1224                 $this->mVariantFlags = $variantFlags;
1225                 $this->mRules = $text;
1226                 $this->mFlags = $flags;
1227         }
1228
1229         /**
1230          * Generate conversion table.
1231          * @private
1232          */
1233         function parseRules() {
1234                 $rules = $this->mRules;
1235                 $bidtable = array();
1236                 $unidtable = array();
1237                 $variants = $this->mConverter->mVariants;
1238                 $varsep_pattern = $this->mConverter->getVarSeparatorPattern();
1239
1240                 $choice = preg_split( $varsep_pattern, $rules );
1241
1242                 foreach ( $choice as $c ) {
1243                         $v  = explode( ':', $c, 2 );
1244                         if ( count( $v ) != 2 ) {
1245                                 // syntax error, skip
1246                                 continue;
1247                         }
1248                         $to = trim( $v[1] );
1249                         $v  = trim( $v[0] );
1250                         $u  = explode( '=>', $v, 2 );
1251                         // if $to is empty, strtr() could return a wrong result
1252                         if ( count( $u ) == 1 && $to && in_array( $v, $variants ) ) {
1253                                 $bidtable[$v] = $to;
1254                         } elseif ( count( $u ) == 2 ) {
1255                                 $from = trim( $u[0] );
1256                                 $v      = trim( $u[1] );
1257                                 if ( array_key_exists( $v, $unidtable )
1258                                          && !is_array( $unidtable[$v] )
1259                                          && $to
1260                                          && in_array( $v, $variants ) ) {
1261                                         $unidtable[$v] = array( $from => $to );
1262                                 } elseif ( $to && in_array( $v, $variants ) ) {
1263                                         $unidtable[$v][$from] = $to;
1264                                 }
1265                         }
1266                         // syntax error, pass
1267                         if ( !isset( $this->mConverter->mVariantNames[$v] ) ) {
1268                                 $bidtable = array();
1269                                 $unidtable = array();
1270                                 break;
1271                         }
1272                 }
1273                 $this->mBidtable = $bidtable;
1274                 $this->mUnidtable = $unidtable;
1275         }
1276
1277         /**
1278          * @private
1279          *
1280          * @return string
1281          */
1282         function getRulesDesc() {
1283                 $codesep = $this->mConverter->mDescCodeSep;
1284                 $varsep = $this->mConverter->mDescVarSep;
1285                 $text = '';
1286                 foreach ( $this->mBidtable as $k => $v ) {
1287                         $text .= $this->mConverter->mVariantNames[$k] . "$codesep$v$varsep";
1288                 }
1289                 foreach ( $this->mUnidtable as $k => $a ) {
1290                         foreach ( $a as $from => $to ) {
1291                                 $text .= $from . '⇒' . $this->mConverter->mVariantNames[$k] .
1292                                         "$codesep$to$varsep";
1293                         }
1294                 }
1295                 return $text;
1296         }
1297
1298         /**
1299          * Parse rules conversion.
1300          * @private
1301          *
1302          * @param $variant
1303          *
1304          * @return string
1305          */
1306         function getRuleConvertedStr( $variant ) {
1307                 $bidtable = $this->mBidtable;
1308                 $unidtable = $this->mUnidtable;
1309
1310                 if ( count( $bidtable ) + count( $unidtable ) == 0 ) {
1311                         return $this->mRules;
1312                 } else {
1313                         // display current variant in bidirectional array
1314                         $disp = $this->getTextInBidtable( $variant );
1315                         // or display current variant in fallbacks
1316                         if ( !$disp ) {
1317                                 $disp = $this->getTextInBidtable(
1318                                                 $this->mConverter->getVariantFallbacks( $variant ) );
1319                         }
1320                         // or display current variant in unidirectional array
1321                         if ( !$disp && array_key_exists( $variant, $unidtable ) ) {
1322                                 $disp = array_values( $unidtable[$variant] );
1323                                 $disp = $disp[0];
1324                         }
1325                         // or display frist text under disable manual convert
1326                         if ( !$disp
1327                                  && $this->mConverter->mManualLevel[$variant] == 'disable' ) {
1328                                 if ( count( $bidtable ) > 0 ) {
1329                                         $disp = array_values( $bidtable );
1330                                         $disp = $disp[0];
1331                                 } else {
1332                                         $disp = array_values( $unidtable );
1333                                         $disp = array_values( $disp[0] );
1334                                         $disp = $disp[0];
1335                                 }
1336                         }
1337                         return $disp;
1338                 }
1339         }
1340
1341         /**
1342          * Generate conversion table for all text.
1343          * @private
1344          */
1345         function generateConvTable() {
1346                 // Special case optimisation
1347                 if ( !$this->mBidtable && !$this->mUnidtable ) {
1348                         $this->mConvTable = array();
1349                         return;
1350                 }
1351
1352                 $bidtable = $this->mBidtable;
1353                 $unidtable = $this->mUnidtable;
1354                 $manLevel = $this->mConverter->mManualLevel;
1355
1356                 $vmarked = array();
1357                 foreach ( $this->mConverter->mVariants as $v ) {
1358                         /* for bidirectional array
1359                                 fill in the missing variants, if any,
1360                                 with fallbacks */
1361                         if ( !isset( $bidtable[$v] ) ) {
1362                                 $variantFallbacks =
1363                                         $this->mConverter->getVariantFallbacks( $v );
1364                                 $vf = $this->getTextInBidtable( $variantFallbacks );
1365                                 if ( $vf ) {
1366                                         $bidtable[$v] = $vf;
1367                                 }
1368                         }
1369
1370                         if ( isset( $bidtable[$v] ) ) {
1371                                 foreach ( $vmarked as $vo ) {
1372                                         // use syntax: -{A|zh:WordZh;zh-tw:WordTw}-
1373                                         // or -{H|zh:WordZh;zh-tw:WordTw}-
1374                                         // or -{-|zh:WordZh;zh-tw:WordTw}-
1375                                         // to introduce a custom mapping between
1376                                         // words WordZh and WordTw in the whole text
1377                                         if ( $manLevel[$v] == 'bidirectional' ) {
1378                                                 $this->mConvTable[$v][$bidtable[$vo]] = $bidtable[$v];
1379                                         }
1380                                         if ( $manLevel[$vo] == 'bidirectional' ) {
1381                                                 $this->mConvTable[$vo][$bidtable[$v]] = $bidtable[$vo];
1382                                         }
1383                                 }
1384                                 $vmarked[] = $v;
1385                         }
1386                         /* for unidirectional array fill to convert tables */
1387                         if ( ( $manLevel[$v] == 'bidirectional' || $manLevel[$v] == 'unidirectional' )
1388                                 && isset( $unidtable[$v] ) )
1389                         {
1390                                 if ( isset( $this->mConvTable[$v] ) ) {
1391                                         $this->mConvTable[$v] = array_merge( $this->mConvTable[$v], $unidtable[$v] );
1392                                 } else {
1393                                         $this->mConvTable[$v] = $unidtable[$v];
1394                                 }
1395                         }
1396                 }
1397         }
1398
1399         /**
1400          * Parse rules and flags.
1401          * @param $variant String: variant language code
1402          */
1403         public function parse( $variant = null ) {
1404                 if ( !$variant ) {
1405                         $variant = $this->mConverter->getPreferredVariant();
1406                 }
1407
1408                 $this->parseFlags();
1409                 $flags = $this->mFlags;
1410
1411                 // convert to specified variant
1412                 // syntax: -{zh-hans;zh-hant[;...]|<text to convert>}-
1413                 if ( $this->mVariantFlags ) {
1414                         // check if current variant in flags
1415                         if ( isset( $this->mVariantFlags[$variant] ) ) {
1416                                 // then convert <text to convert> to current language
1417                                 $this->mRules = $this->mConverter->autoConvert( $this->mRules,
1418                                         $variant );
1419                         } else { // if current variant no in flags,
1420                                    // then we check its fallback variants.
1421                                 $variantFallbacks =
1422                                         $this->mConverter->getVariantFallbacks( $variant );
1423                                 if( is_array( $variantFallbacks ) ) {
1424                                         foreach ( $variantFallbacks as $variantFallback ) {
1425                                                 // if current variant's fallback exist in flags
1426                                                 if ( isset( $this->mVariantFlags[$variantFallback] ) ) {
1427                                                         // then convert <text to convert> to fallback language
1428                                                         $this->mRules =
1429                                                                 $this->mConverter->autoConvert( $this->mRules,
1430                                                                         $variantFallback );
1431                                                         break;
1432                                                 }
1433                                         }
1434                                 }
1435                         }
1436                         $this->mFlags = $flags = array( 'R' => true );
1437                 }
1438
1439                 if ( !isset( $flags['R'] ) && !isset( $flags['N'] ) ) {
1440                         // decode => HTML entities modified by Sanitizer::removeHTMLtags
1441                         $this->mRules = str_replace( '=&gt;', '=>', $this->mRules );
1442                         $this->parseRules();
1443                 }
1444                 $rules = $this->mRules;
1445
1446                 if ( !$this->mBidtable && !$this->mUnidtable ) {
1447                         if ( isset( $flags['+'] ) || isset( $flags['-'] ) ) {
1448                                 // fill all variants if text in -{A/H/-|text} without rules
1449                                 foreach ( $this->mConverter->mVariants as $v ) {
1450                                         $this->mBidtable[$v] = $rules;
1451                                 }
1452                         } elseif ( !isset( $flags['N'] ) && !isset( $flags['T'] ) ) {
1453                                 $this->mFlags = $flags = array( 'R' => true );
1454                         }
1455                 }
1456
1457                 $this->mRuleDisplay = false;
1458                 foreach ( $flags as $flag => $unused ) {
1459                         switch ( $flag ) {
1460                                 case 'R':
1461                                         // if we don't do content convert, still strip the -{}- tags
1462                                         $this->mRuleDisplay = $rules;
1463                                         break;
1464                                 case 'N':
1465                                         // process N flag: output current variant name
1466                                         $ruleVar = trim( $rules );
1467                                         if ( isset( $this->mConverter->mVariantNames[$ruleVar] ) ) {
1468                                                 $this->mRuleDisplay = $this->mConverter->mVariantNames[$ruleVar];
1469                                         } else {
1470                                                 $this->mRuleDisplay = '';
1471                                         }
1472                                         break;
1473                                 case 'D':
1474                                         // process D flag: output rules description
1475                                         $this->mRuleDisplay = $this->getRulesDesc();
1476                                         break;
1477                                 case 'H':
1478                                         // process H,- flag or T only: output nothing
1479                                         $this->mRuleDisplay = '';
1480                                         break;
1481                                 case '-':
1482                                         $this->mRulesAction = 'remove';
1483                                         $this->mRuleDisplay = '';
1484                                         break;
1485                                 case '+':
1486                                         $this->mRulesAction = 'add';
1487                                         $this->mRuleDisplay = '';
1488                                         break;
1489                                 case 'S':
1490                                         $this->mRuleDisplay = $this->getRuleConvertedStr( $variant );
1491                                         break;
1492                                 case 'T':
1493                                         $this->mRuleTitle = $this->getRuleConvertedStr( $variant );
1494                                         $this->mRuleDisplay = '';
1495                                         break;
1496                                 default:
1497                                         // ignore unknown flags (but see error case below)
1498                         }
1499                 }
1500                 if ( $this->mRuleDisplay === false ) {
1501                         $this->mRuleDisplay = '<span class="error">'
1502                                 . wfMessage( 'converter-manual-rule-error' )->inContentLanguage()->escaped()
1503                                 . '</span>';
1504                 }
1505
1506                 $this->generateConvTable();
1507         }
1508
1509         /**
1510          * @todo FIXME: code this function :)
1511          */
1512         public function hasRules() {
1513                 // TODO:
1514         }
1515
1516         /**
1517          * Get display text on markup -{...}-
1518          * @return string
1519          */
1520         public function getDisplay() {
1521                 return $this->mRuleDisplay;
1522         }
1523
1524         /**
1525          * Get converted title.
1526          * @return string
1527          */
1528         public function getTitle() {
1529                 return $this->mRuleTitle;
1530         }
1531
1532         /**
1533          * Return how deal with conversion rules.
1534          * @return string
1535          */
1536         public function getRulesAction() {
1537                 return $this->mRulesAction;
1538         }
1539
1540         /**
1541          * Get conversion table. (bidirectional and unidirectional
1542          * conversion table)
1543          * @return array
1544          */
1545         public function getConvTable() {
1546                 return $this->mConvTable;
1547         }
1548
1549         /**
1550          * Get conversion rules string.
1551          * @return string
1552          */
1553         public function getRules() {
1554                 return $this->mRules;
1555         }
1556
1557         /**
1558          * Get conversion flags.
1559          * @return array
1560          */
1561         public function getFlags() {
1562                 return $this->mFlags;
1563         }
1564 }