includes/Content.php

   1 <?php
   2
   3 /**
   4  * A content object represents page content, e.g. the text to show on a page.
   5  * Content objects have no knowledge about how they relate to Wiki pages.
   6  *
   7  * @since 1.WD
   8  */
   9 abstract class Content {
  10
  11         /**
  12          * Name of the content model this Content object represents.
  13          * Use with CONTENT_MODEL_XXX constants
  14          *
  15          * @var String $model_id
  16          */
  17         protected $model_id;
  18
  19         /**
  20          * @since WD.1
  21          *
  22          * @return String a string representing the content in a way useful for building a full text search index.
  23          *         If no useful representation exists, this method returns an empty string.
  24          */
  25         public abstract function getTextForSearchIndex( );
  26
  27         /**
  28          * @since WD.1
  29          *
  30          * @return String the wikitext to include when another page includes this  content, or false if the content is not
  31          *         includable in a wikitext page.
  32          *
  33          * @TODO: allow native handling, bypassing wikitext representation, like for includable special pages.
  34          * @TODO: use in parser, etc!
  35          */
  36         public abstract function getWikitextForTransclusion( );
  37
  38         /**
  39          * Returns a textual representation of the content suitable for use in edit summaries and log messages.
  40          *
  41          * @since WD.1
  42          *
  43          * @param int $maxlength maximum length of the summary text
  44          * @return String the summary text
  45          */
  46         public abstract function getTextForSummary( $maxlength = 250 );
  47
  48         /**
  49          * Returns native represenation of the data. Interpretation depends on the data model used,
  50          * as given by getDataModel().
  51          *
  52          * @since WD.1
  53          *
  54          * @return mixed the native representation of the content. Could be a string, a nested array
  55          *         structure, an object, a binary blob... anything, really.
  56          *
  57          * @NOTE: review all calls carefully, caller must be aware of content model!
  58          */
  59         public abstract function getNativeData( );
  60
  61         /**
  62          * returns the content's nominal size in bogo-bytes.
  63          *
  64          * @return int
  65          */
  66         public abstract function getSize( );
  67
  68         /**
  69          * @param int $model_id
  70          */
  71         public function __construct( $model_id = null ) {
  72                 $this->model_id = $model_id;
  73         }
  74
  75         /**
  76          * Returns the id of the content model used by this content objects.
  77          * Corresponds to the CONTENT_MODEL_XXX constants.
  78          *
  79          * @since WD.1
  80          *
  81          * @return int the model id
  82          */
  83         public function getModel() {
  84                 return $this->model_id;
  85         }
  86
  87         /**
  88          * Throws an MWException if $model_id is not the id of the content model
  89          * supported by this Content object.
  90          *
  91          * @param int $model_id the model to check
  92          */
  93         protected function checkModelID( $model_id ) {
  94                 if ( $model_id !== $this->model_id ) {
  95                         $model_name = ContentHandler::getContentModelName( $model_id );
  96                         $own_model_name = ContentHandler::getContentModelName( $this->model_id );
  97
  98                         throw new MWException( "Bad content model: expected {$this->model_id} ($own_model_name) but got found $model_id ($model_name)." );
  99                 }
 100         }
 101
 102         /**
 103          * Conveniance method that returns the ContentHandler singleton for handling the content
 104          * model this Content object uses.
 105          *
 106          * Shorthand for ContentHandler::getForContent( $this )
 107          *
 108          * @since WD.1
 109          *
 110          * @return ContentHandler
 111          */
 112         public function getContentHandler() {
 113                 return ContentHandler::getForContent( $this );
 114         }
 115
 116         /**
 117          * Conveniance method that returns the default serialization format for the content model
 118          * model this Content object uses.
 119          *
 120          * Shorthand for $this->getContentHandler()->getDefaultFormat()
 121          *
 122          * @since WD.1
 123          *
 124          * @return ContentHandler
 125          */
 126         public function getDefaultFormat() {
 127                 return $this->getContentHandler()->getDefaultFormat();
 128         }
 129
 130         /**
 131          * Conveniance method that returns the list of serialization formats supported
 132          * for the content model model this Content object uses.
 133          *
 134          * Shorthand for $this->getContentHandler()->getSupportedFormats()
 135          *
 136          * @since WD.1
 137          *
 138          * @return array of supported serialization formats
 139          */
 140         public function getSupportedFormats() {
 141                 return $this->getContentHandler()->getSupportedFormats();
 142         }
 143
 144         /**
 145          * Returns true if $format is a supported serialization format for this Content object,
 146          * false if it isn't.
 147          *
 148          * Note that this will always return true if $format is null, because null stands for the
 149          * default serialization.
 150          *
 151          * Shorthand for $this->getContentHandler()->isSupportedFormat( $format )
 152          *
 153          * @since WD.1
 154          *
 155          * @param String $format the format to check
 156          * @return bool whether the format is supported
 157          */
 158         public function isSupportedFormat( $format ) {
 159                 if ( !$format ) {
 160                         return true; // this means "use the default"
 161                 }
 162
 163                 return $this->getContentHandler()->isSupportedFormat( $format );
 164         }
 165
 166         /**
 167          * Throws an MWException if $this->isSupportedFormat( $format ) doesn't return true.
 168          *
 169          * @param $format
 170          * @throws MWException
 171          */
 172         protected function checkFormat( $format ) {
 173                 if ( !$this->isSupportedFormat( $format ) ) {
 174                         throw new MWException( "Format $format is not supported for content model " . $this->getModel() );
 175                 }
 176         }
 177
 178         /**
 179          * Conveniance method for serializing this Content object.
 180          *
 181          * Shorthand for $this->getContentHandler()->serializeContent( $this, $format )
 182          *
 183          * @since WD.1
 184          *
 185          * @param null|String $format the desired serialization format (or null for the default format).
 186          * @return String serialized form of this Content object
 187          */
 188         public function serialize( $format = null ) {
 189                 return $this->getContentHandler()->serializeContent( $this, $format );
 190         }
 191
 192         /**
 193          * Returns true if this Content object represents empty content.
 194          *
 195          * @since WD.1
 196          *
 197          * @return bool whether this Content object is empty
 198          */
 199         public function isEmpty() {
 200                 return $this->getSize() == 0;
 201         }
 202
 203         /**
 204          * Returns if the content is valid.
 205          * It needs to be valid before it can be saved.
 206          *
 207          * @since WD.1
 208          *
 209          * @return boolean
 210          */
 211         public function isValid() {
 212                 // TODO
 213                 return true;
 214         }
 215
 216         /**
 217          * Diff this content object with another content object..
 218          *
 219          * @since WD.diff
 220          *
 221          * @return DiffResult
 222          */
 223         public abstract function diff( Content $that );
 224
 225         /**
 226          * Returns true if this Content objects is conceptually equivalent to the given Content object.
 227          *
 228          * Will returns false if $that is null.
 229          * Will return true if $that === $this.
 230          * Will return false if $that->getModleName() != $this->getModel().
 231          * Will return false if $that->getNativeData() is not equal to $this->getNativeData(),
 232          * where the meaning of "equal" depends on the actual data model.
 233          *
 234          * Implementations should be careful to make equals() transitive and reflexive:
 235          *
 236          * * $a->equals( $b ) <=> $b->equals( $b )
 237          * * $a->equals( $b ) &&  $b->equals( $c ) ==> $a->equals( $c )
 238          *
 239          * @since WD.1
 240          *
 241          * @param Content $that the Content object to compare to
 242          * @return bool true if this Content object is euqual to $that, false otherwise.
 243          */
 244         public function equals( Content $that = null ) {
 245                 if ( is_null( $that ) ){
 246                         return false;
 247                 }
 248
 249                 if ( $that === $this ) {
 250                         return true;
 251                 }
 252
 253                 if ( $that->getModel() !== $this->getModel() ) {
 254                         return false;
 255                 }
 256
 257                 return $this->getNativeData() === $that->getNativeData();
 258         }
 259
 260         /**
 261          * Return a copy of this Content object. The following must be true for the object returned
 262          * if $copy = $original->copy()
 263          *
 264          * * get_class($original) === get_class($copy)
 265          * * $original->getModel() === $copy->getModel()
 266          * * $original->equals( $copy )
 267          *
 268          * If and only if the Content object is imutable, the copy() method can and should
 269          * return $this. That is,  $copy === $original may be true, but only for imutable content
 270          * objects.
 271          *
 272          * @since WD.1
 273          *
 274          * @return Content. A copy of this object
 275          */
 276         public abstract function copy( );
 277
 278         /**
 279          * Returns true if this content is countable as a "real" wiki page, provided
 280          * that it's also in a countable location (e.g. a current revision in the main namespace).
 281          *
 282          * @since WD.1
 283          *
 284          * @param $hasLinks Bool: if it is known whether this content contains links, provide this information here,
 285          *                        to avoid redundant parsing to find out.
 286          * @return boolean
 287          */
 288         public abstract function isCountable( $hasLinks = null ) ;
 289
 290         /**
 291          * @param Title $title
 292          * @param null $revId
 293          * @param null|ParserOptions $options
 294          * @param Boolean $generateHtml whether to generate Html (default: true). If false,
 295          *        the result of calling getText() on the ParserOutput object returned by
 296          *        this method is undefined.
 297          *
 298          * @since WD.1
 299          *
 300          * @return ParserOutput
 301          */
 302         public abstract function getParserOutput( Title $title, $revId = null, ParserOptions $options = null, $generateHtml = true );
 303
 304         /**
 305          * Returns a list of DataUpdate objects for recording information about this Content in some secondary
 306          * data store. If the optional second argument, $old, is given, the updates may model only the changes that
 307          * need to be made to replace information about the old content with infomration about the new content.
 308          *
 309          * This default implementation calls $this->getParserOutput( $title, null, null, false ), and then
 310          * calls getSecondaryDataUpdates( $title, $recursive ) on the resulting ParserOutput object.
 311          *
 312          * Subclasses may implement this to determine the necessary updates more efficiently, or make use of information
 313          * about the old content.
 314          *
 315          * @param Title $title the context for determining the necessary updates
 316          * @param Content|null $old a Content object representing the previous content, i.e. the content being
 317          *                     replaced by this Content object.
 318          * @param bool $recursive whether to include recursive updates (default: false).
 319          *
 320          * @return Array. A list of DataUpdate objects for putting information about this content object somewhere.
 321          *
 322          * @since WD.1
 323          */
 324         public function getSecondaryDataUpdates( Title $title, Content $old = null, $recursive = false ) {
 325                 $po = $this->getParserOutput( $title, null, null, false );
 326                 return $po->getSecondaryDataUpdates( $title, $recursive );
 327         }
 328
 329         /**
 330          * Construct the redirect destination from this content and return an
 331          * array of Titles, or null if this content doesn't represent a redirect.
 332          * The last element in the array is the final destination after all redirects
 333          * have been resolved (up to $wgMaxRedirects times).
 334          *
 335          * @since WD.1
 336          *
 337          * @return Array of Titles, with the destination last
 338          */
 339         public function getRedirectChain() {
 340                 return null;
 341         }
 342
 343         /**
 344          * Construct the redirect destination from this content and return an
 345          * array of Titles, or null if this content doesn't represent a redirect.
 346          * This will only return the immediate redirect target, useful for
 347          * the redirect table and other checks that don't need full recursion.
 348          *
 349          * @since WD.1
 350          *
 351          * @return Title: The corresponding Title
 352          */
 353         public function getRedirectTarget() {
 354                 return null;
 355         }
 356
 357         /**
 358          * Construct the redirect destination from this content and return the
 359          * Title, or null if this content doesn't represent a redirect.
 360          * This will recurse down $wgMaxRedirects times or until a non-redirect target is hit
 361          * in order to provide (hopefully) the Title of the final destination instead of another redirect.
 362          *
 363          * @since WD.1
 364          *
 365          * @return Title
 366          */
 367         public function getUltimateRedirectTarget() {
 368                 return null;
 369         }
 370
 371         /**
 372          * @since WD.1
 373          *
 374          * @return bool
 375          */
 376         public function isRedirect() {
 377                 return $this->getRedirectTarget() !== null;
 378         }
 379
 380         /**
 381          * Returns the section with the given id.
 382          *
 383          * The default implementation returns null.
 384          *
 385          * @since WD.1
 386          *
 387          * @param String $sectionId the section's id, given as a numeric string. The id "0" retrieves the section before
 388          *          the first heading, "1" the text between the first heading (inluded) and the second heading (excluded), etc.
 389          * @return Content|Boolean|null the section, or false if no such section exist, or null if sections are not supported
 390          */
 391         public function getSection( $sectionId ) {
 392                 return null;
 393         }
 394
 395         /**
 396          * Replaces a section of the content and returns a Content object with the section replaced.
 397          *
 398          * @since WD.1
 399          *
 400          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...), or "new"
 401          * @param $with Content: new content of the section
 402          * @param $sectionTitle String: new section's subject, only if $section is 'new'
 403          * @return string Complete article text, or null if error
 404          */
 405         public function replaceSection( $section, Content $with, $sectionTitle = ''  ) {
 406                 return null;
 407         }
 408
 409         /**
 410          * Returns a Content object with pre-save transformations applied (or this object if no transformations apply).
 411          *
 412          * @since WD.1
 413          *
 414          * @param Title $title
 415          * @param User $user
 416          * @param null|ParserOptions $popts
 417          * @return Content
 418          */
 419         public function preSaveTransform( Title $title, User $user, ParserOptions $popts ) {
 420                 return $this;
 421         }
 422
 423         /**
 424          * Returns a new WikitextContent object with the given section heading prepended, if supported.
 425          * The default implementation just returns this Content object unmodified, ignoring the section header.
 426          *
 427          * @since WD.1
 428          *
 429          * @param $header String
 430          * @return Content
 431          */
 432         public function addSectionHeader( $header ) {
 433                 return $this;
 434         }
 435
 436         /**
 437          * Returns a Content object with preload transformations applied (or this object if no transformations apply).
 438          *
 439          * @since WD.1
 440          *
 441          * @param Title $title
 442          * @param null|ParserOptions $popts
 443          * @return Content
 444          */
 445         public function preloadTransform( Title $title, ParserOptions $popts ) {
 446                 return $this;
 447         }
 448
 449         # TODO: handle ImagePage and CategoryPage
 450         # TODO: make sure we cover lucene search / wikisearch.
 451         # TODO: make sure ReplaceTemplates still works
 452         # FUTURE: nice&sane integration of GeSHi syntax highlighting
 453         #   [11:59] <vvv> Hooks are ugly; make CodeHighlighter interface and a config to set the class which handles syntax highlighting
 454         #   [12:00] <vvv> And default it to a DummyHighlighter
 455
 456         # TODO: make sure we cover the external editor interface (does anyone actually use that?!)
 457
 458         # TODO: tie into API to provide contentModel for Revisions
 459         # TODO: tie into API to provide serialized version and contentFormat for Revisions
 460         # TODO: tie into API edit interface
 461         # FUTURE: make EditForm plugin for EditPage
 462 }
 463         # FUTURE: special type for redirects?!
 464         # FUTURE: MultipartMultipart < WikipageContent (Main + Links + X)
 465         # FUTURE: LinksContent < LanguageLinksContent, CategoriesContent
 466
 467 /**
 468  * Content object implementation for representing flat text.
 469  *
 470  * TextContent instances are imutable
 471  *
 472  * @since WD.1
 473  */
 474 abstract class TextContent extends Content {
 475
 476         public function __construct( $text, $model_id = null ) {
 477                 parent::__construct( $model_id );
 478
 479                 $this->mText = $text;
 480         }
 481
 482         public function copy() {
 483                 return $this; #NOTE: this is ok since TextContent are imutable.
 484         }
 485
 486         public function getTextForSummary( $maxlength = 250 ) {
 487                 global $wgContLang;
 488
 489                 $text = $this->getNativeData();
 490
 491                 $truncatedtext = $wgContLang->truncate(
 492                         preg_replace( "/[\n\r]/", ' ', $text ),
 493                         max( 0, $maxlength ) );
 494
 495                 return $truncatedtext;
 496         }
 497
 498         /**
 499          * returns the text's size in bytes.
 500          *
 501          * @return int the size
 502          */
 503         public function getSize( ) {
 504                 $text = $this->getNativeData( );
 505                 return strlen( $text );
 506         }
 507
 508         /**
 509          * Returns true if this content is not a redirect, and $wgArticleCountMethod is "any".
 510          *
 511          * @param $hasLinks Bool: if it is known whether this content contains links, provide this information here,
 512          *                        to avoid redundant parsing to find out.
 513          *
 514          * @return bool true if the content is countable
 515          */
 516         public function isCountable( $hasLinks = null ) {
 517                 global $wgArticleCountMethod;
 518
 519                 if ( $this->isRedirect( ) ) {
 520                         return false;
 521                 }
 522
 523                 if (  $wgArticleCountMethod === 'any' ) {
 524                         return true;
 525                 }
 526
 527                 return false;
 528         }
 529
 530         /**
 531          * Returns the text represented by this Content object, as a string.
 532          *
 533          * @return String the raw text
 534          */
 535         public function getNativeData( ) {
 536                 $text = $this->mText;
 537                 return $text;
 538         }
 539
 540         /**
 541          * Returns the text represented by this Content object, as a string.
 542          *
 543          * @return String the raw text
 544          */
 545         public function getTextForSearchIndex( ) {
 546                 return $this->getNativeData();
 547         }
 548
 549         /**
 550          * Returns the text represented by this Content object, as a string.
 551          *
 552          * @return String the raw text
 553          */
 554         public function getWikitextForTransclusion( ) {
 555                 return $this->getNativeData();
 556         }
 557
 558         /**
 559          * Returns a generic ParserOutput object, wrapping the HTML returned by getHtml().
 560          *
 561          * @return ParserOutput representing the HTML form of the text
 562          */
 563         public function getParserOutput( Title $title, $revId = null, ParserOptions $options = null, $generateHtml = true ) {
 564                 # generic implementation, relying on $this->getHtml()
 565
 566                 if ( $generateHtml ) $html = $this->getHtml( $options );
 567                 else $html = '';
 568
 569                 $po = new ParserOutput( $html );
 570
 571                 return $po;
 572         }
 573
 574         protected abstract function getHtml( );
 575
 576         /**
 577          * Diff this content object with another content object..
 578          *
 579          * @since WD.diff
 580          *
 581          * @param Content $that the other content object to compare this content object to
 582          * @param Language $lang the language object to use for text segmentation. If not given, $wgContentLang is used.
 583          *
 584          * @return DiffResult a diff representing the changes that would have to be made to this content object
 585          *         to make it equal to $that.
 586          */
 587         public function diff( Content $that, Language $lang = null ) {
 588                 global $wgContLang;
 589
 590                 $this->checkModelID( $that->getModel() );
 591
 592                 #@todo: could implement this in DifferenceEngine and just delegate here?
 593
 594                 if ( !$lang ) $lang = $wgContLang;
 595
 596                 $otext = $this->getNativeData();
 597                 $ntext = $this->getNativeData();
 598
 599                 # Note: Use native PHP diff, external engines don't give us abstract output
 600                 $ota = explode( "\n", $wgContLang->segmentForDiff( $otext ) );
 601                 $nta = explode( "\n", $wgContLang->segmentForDiff( $ntext ) );
 602
 603                 $diffs = new Diff( $ota, $nta );
 604                 return $diff;
 605         }
 606
 607
 608 }
 609
 610 /**
 611  * @since WD.1
 612  */
 613 class WikitextContent extends TextContent {
 614
 615         public function __construct( $text ) {
 616                 parent::__construct($text, CONTENT_MODEL_WIKITEXT);
 617         }
 618
 619         protected function getHtml( ) {
 620                 throw new MWException( "getHtml() not implemented for wikitext. Use getParserOutput()->getText()." );
 621         }
 622
 623         /**
 624          * Returns a ParserOutput object resulting from parsing the content's text using $wgParser.
 625          *
 626          * @since WikiData1
 627          *
 628          * @param IContextSource|null $context
 629          * @param null $revId
 630          * @param null|ParserOptions $options
 631          * @param bool $generateHtml
 632          *
 633          * @return ParserOutput representing the HTML form of the text
 634          */
 635         public function getParserOutput( Title $title, $revId = null, ParserOptions $options = null, $generateHtml = true ) {
 636                 global $wgParser;
 637
 638                 if ( !$options ) {
 639                         $options = new ParserOptions();
 640                 }
 641
 642                 $po = $wgParser->parse( $this->mText, $title, $options, true, true, $revId );
 643
 644                 return $po;
 645         }
 646
 647         /**
 648          * Returns the section with the given id.
 649          *
 650          * @param String $sectionId the section's id
 651          * @return Content|false|null the section, or false if no such section exist, or null if sections are not supported
 652          */
 653         public function getSection( $section ) {
 654                 global $wgParser;
 655
 656                 $text = $this->getNativeData();
 657                 $sect = $wgParser->getSection( $text, $section, false );
 658
 659                 return  new WikitextContent( $sect );
 660         }
 661
 662         /**
 663          * Replaces a section in the wikitext
 664          *
 665          * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...), or "new"
 666          * @param $with Content: new content of the section
 667          * @param $sectionTitle String: new section's subject, only if $section is 'new'
 668          * @return Content Complete article content, or null if error
 669          */
 670         public function replaceSection( $section, Content $with, $sectionTitle = '' ) {
 671                 wfProfileIn( __METHOD__ );
 672
 673                 $myModelId = $this->getModel();
 674                 $sectionModelId = $with->getModel();
 675
 676                 if ( $sectionModelId != $myModelId  ) {
 677                         $myModelName = ContentHandler::getContentModelName( $myModelId );
 678                         $sectionModelName = ContentHandler::getContentModelName( $sectionModelId );
 679
 680                         throw new MWException( "Incompatible content model for section: document uses $myModelId ($myModelName), "
 681                                                                 . "section uses $sectionModelId ($sectionModelName)." );
 682                 }
 683
 684                 $oldtext = $this->getNativeData();
 685                 $text = $with->getNativeData();
 686
 687                 if ( $section === '' ) {
 688                         return $with; #XXX: copy first?
 689                 } if ( $section == 'new' ) {
 690                         # Inserting a new section
 691                         $subject = $sectionTitle ? wfMsgForContent( 'newsectionheaderdefaultlevel', $sectionTitle ) . "\n\n" : '';
 692                         if ( wfRunHooks( 'PlaceNewSection', array( $this, $oldtext, $subject, &$text ) ) ) {
 693                                 $text = strlen( trim( $oldtext ) ) > 0
 694                                         ? "{$oldtext}\n\n{$subject}{$text}"
 695                                         : "{$subject}{$text}";
 696                         }
 697                 } else {
 698                         # Replacing an existing section; roll out the big guns
 699                         global $wgParser;
 700
 701                         $text = $wgParser->replaceSection( $oldtext, $section, $text );
 702                 }
 703
 704                 $newContent = new WikitextContent( $text );
 705
 706                 wfProfileOut( __METHOD__ );
 707                 return $newContent;
 708         }
 709
 710         /**
 711          * Returns a new WikitextContent object with the given section heading prepended.
 712          *
 713          * @param $header String
 714          * @return Content
 715          */
 716         public function addSectionHeader( $header ) {
 717                 $text = wfMsgForContent( 'newsectionheaderdefaultlevel', $header ) . "\n\n" . $this->getNativeData();
 718
 719                 return new WikitextContent( $text );
 720         }
 721
 722         /**
 723          * Returns a Content object with pre-save transformations applied (or this object if no transformations apply).
 724          *
 725          * @param Title $title
 726          * @param User $user
 727          * @param ParserOptions $popts
 728          * @return Content
 729          */
 730         public function preSaveTransform( Title $title, User $user, ParserOptions $popts ) {
 731                 global $wgParser, $wgConteLang;
 732
 733                 $text = $this->getNativeData();
 734                 $pst = $wgParser->preSaveTransform( $text, $title, $user, $popts );
 735
 736                 return new WikitextContent( $pst );
 737         }
 738
 739         /**
 740          * Returns a Content object with preload transformations applied (or this object if no transformations apply).
 741          *
 742          * @param Title $title
 743          * @param ParserOptions $popts
 744          * @return Content
 745          */
 746         public function preloadTransform( Title $title, ParserOptions $popts ) {
 747                 global $wgParser, $wgConteLang;
 748
 749                 $text = $this->getNativeData();
 750                 $plt = $wgParser->getPreloadText( $text, $title, $popts );
 751
 752                 return new WikitextContent( $plt );
 753         }
 754
 755         public function getRedirectChain() {
 756                 $text = $this->getNativeData();
 757                 return Title::newFromRedirectArray( $text );
 758         }
 759
 760         public function getRedirectTarget() {
 761                 $text = $this->getNativeData();
 762                 return Title::newFromRedirect( $text );
 763         }
 764
 765         public function getUltimateRedirectTarget() {
 766                 $text = $this->getNativeData();
 767                 return Title::newFromRedirectRecurse( $text );
 768         }
 769
 770         /**
 771          * Returns true if this content is not a redirect, and this content's text is countable according to
 772          * the criteria defiend by $wgArticleCountMethod.
 773          *
 774          * @param Bool $hasLinks if it is known whether this content contains links, provide this information here,
 775          *                        to avoid redundant parsing to find out.
 776          * @param IContextSource $context context for parsing if necessary
 777          *
 778          * @return bool true if the content is countable
 779          */
 780         public function isCountable( $hasLinks = null, Title $title = null ) {
 781                 global $wgArticleCountMethod, $wgRequest;
 782
 783                 if ( $this->isRedirect( ) ) {
 784                         return false;
 785                 }
 786
 787                 $text = $this->getNativeData();
 788
 789                 switch ( $wgArticleCountMethod ) {
 790                         case 'any':
 791                                 return true;
 792                         case 'comma':
 793                                 return strpos( $text,  ',' ) !== false;
 794                         case 'link':
 795                                 if ( $hasLinks === null ) { # not known, find out
 796                                         if ( !$title ) {
 797                                                 $context = RequestContext::getMain();
 798                                                 $title = $context->getTitle();
 799                                         }
 800
 801                                         $po = $this->getParserOutput( $title, null, null, false );
 802                                         $links = $po->getLinks();
 803                                         $hasLinks = !empty( $links );
 804                                 }
 805
 806                                 return $hasLinks;
 807                 }
 808         }
 809
 810         public function getTextForSummary( $maxlength = 250 ) {
 811                 $truncatedtext = parent::getTextForSummary( $maxlength );
 812
 813                 #clean up unfinished links
 814                 #XXX: make this optional? wasn't there in autosummary, but required for deletion summary.
 815                 $truncatedtext = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $truncatedtext );
 816
 817                 return $truncatedtext;
 818         }
 819
 820 }
 821
 822 /**
 823  * @since WD.1
 824  */
 825 class MessageContent extends TextContent {
 826         public function __construct( $msg_key, $params = null, $options = null ) {
 827                 parent::__construct(null, CONTENT_MODEL_WIKITEXT); #XXX: messages may be wikitext, html or plain text! and maybe even something else entirely.
 828
 829                 $this->mMessageKey = $msg_key;
 830
 831                 $this->mParameters = $params;
 832
 833                 if ( is_null( $options ) ) {
 834                         $options = array();
 835                 }
 836                 elseif ( is_string( $options ) ) {
 837                         $options = array( $options );
 838                 }
 839
 840                 $this->mOptions = $options;
 841
 842                 $this->mHtmlOptions = null;
 843         }
 844
 845         /**
 846          * Returns the message as rendered HTML, using the options supplied to the constructor plus "parse".
 847          */
 848         protected function getHtml(  ) {
 849                 $opt = array_merge( $this->mOptions, array('parse') );
 850
 851                 return wfMsgExt( $this->mMessageKey, $this->mParameters, $opt );
 852         }
 853
 854
 855         /**
 856          * Returns the message as raw text, using the options supplied to the constructor minus "parse" and "parseinline".
 857          */
 858         public function getNativeData( ) {
 859                 $opt = array_diff( $this->mOptions, array('parse', 'parseinline') );
 860
 861                 return wfMsgExt( $this->mMessageKey, $this->mParameters, $opt );
 862         }
 863
 864 }
 865
 866 /**
 867  * @since WD.1
 868  */
 869 class JavaScriptContent extends TextContent {
 870         public function __construct( $text ) {
 871                 parent::__construct($text, CONTENT_MODEL_JAVASCRIPT);
 872         }
 873
 874         protected function getHtml( ) {
 875                 $html = "";
 876                 $html .= "<pre class=\"mw-code mw-js\" dir=\"ltr\">\n";
 877                 $html .= htmlspecialchars( $this->getNativeData() );
 878                 $html .= "\n</pre>\n";
 879
 880                 return $html;
 881         }
 882
 883 }
 884
 885 /**
 886  * @since WD.1
 887  */
 888 class CssContent extends TextContent {
 889         public function __construct( $text ) {
 890                 parent::__construct($text, CONTENT_MODEL_CSS);
 891         }
 892
 893         protected function getHtml( ) {
 894                 $html = "";
 895                 $html .= "<pre class=\"mw-code mw-css\" dir=\"ltr\">\n";
 896                 $html .= htmlspecialchars( $this->getNativeData() );
 897                 $html .= "\n</pre>\n";
 898
 899                 return $html;
 900         }
 901 }