includes/Export.php

   1 <?php
   2 /**
   3  * Base classes for dumps and export
   4  *
   5  * Copyright © 2003, 2005, 2006 Brion Vibber <brion@pobox.com>
   6  * http://www.mediawiki.org/
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  */
  25
  26 /**
  27  * @defgroup Dump Dump
  28  */
  29
  30 /**
  31  * @ingroup SpecialPage Dump
  32  */
  33 class WikiExporter {
  34         var $list_authors = false; # Return distinct author list (when not returning full history)
  35         var $author_list = "";
  36
  37         var $dumpUploads = false;
  38         var $dumpUploadFileContents = false;
  39
  40         const FULL = 1;
  41         const CURRENT = 2;
  42         const STABLE = 4; // extension defined
  43         const LOGS = 8;
  44         const RANGE = 16;
  45
  46         const BUFFER = 0;
  47         const STREAM = 1;
  48
  49         const TEXT = 0;
  50         const STUB = 1;
  51
  52         var $buffer;
  53
  54         var $text;
  55
  56         /**
  57          * @var DumpOutput
  58          */
  59         var $sink;
  60
  61         /**
  62          * Returns the export schema version.
  63          * @return string
  64          */
  65         public static function schemaVersion() {
  66                 return "0.8";
  67         }
  68
  69         /**
  70          * If using WikiExporter::STREAM to stream a large amount of data,
  71          * provide a database connection which is not managed by
  72          * LoadBalancer to read from: some history blob types will
  73          * make additional queries to pull source data while the
  74          * main query is still running.
  75          *
  76          * @param $db DatabaseBase
  77          * @param $history Mixed: one of WikiExporter::FULL, WikiExporter::CURRENT,
  78          *                 WikiExporter::RANGE or WikiExporter::STABLE,
  79          *                 or an associative array:
  80          *                   offset: non-inclusive offset at which to start the query
  81          *                   limit: maximum number of rows to return
  82          *                   dir: "asc" or "desc" timestamp order
  83          * @param int $buffer one of WikiExporter::BUFFER or WikiExporter::STREAM
  84          * @param int $text one of WikiExporter::TEXT or WikiExporter::STUB
  85          */
  86         function __construct( $db, $history = WikiExporter::CURRENT,
  87                         $buffer = WikiExporter::BUFFER, $text = WikiExporter::TEXT ) {
  88                 $this->db = $db;
  89                 $this->history = $history;
  90                 $this->buffer = $buffer;
  91                 $this->writer = new XmlDumpWriter();
  92                 $this->sink = new DumpOutput();
  93                 $this->text = $text;
  94         }
  95
  96         /**
  97          * Set the DumpOutput or DumpFilter object which will receive
  98          * various row objects and XML output for filtering. Filters
  99          * can be chained or used as callbacks.
 100          *
 101          * @param $sink mixed
 102          */
 103         public function setOutputSink( &$sink ) {
 104                 $this->sink =& $sink;
 105         }
 106
 107         public function openStream() {
 108                 $output = $this->writer->openStream();
 109                 $this->sink->writeOpenStream( $output );
 110         }
 111
 112         public function closeStream() {
 113                 $output = $this->writer->closeStream();
 114                 $this->sink->writeCloseStream( $output );
 115         }
 116
 117         /**
 118          * Dumps a series of page and revision records for all pages
 119          * in the database, either including complete history or only
 120          * the most recent version.
 121          */
 122         public function allPages() {
 123                 $this->dumpFrom( '' );
 124         }
 125
 126         /**
 127          * Dumps a series of page and revision records for those pages
 128          * in the database falling within the page_id range given.
 129          * @param int $start inclusive lower limit (this id is included)
 130          * @param $end   Int: Exclusive upper limit (this id is not included)
 131          *                   If 0, no upper limit.
 132          */
 133         public function pagesByRange( $start, $end ) {
 134                 $condition = 'page_id >= ' . intval( $start );
 135                 if ( $end ) {
 136                         $condition .= ' AND page_id < ' . intval( $end );
 137                 }
 138                 $this->dumpFrom( $condition );
 139         }
 140
 141         /**
 142          * Dumps a series of page and revision records for those pages
 143          * in the database with revisions falling within the rev_id range given.
 144          * @param int $start inclusive lower limit (this id is included)
 145          * @param $end   Int: Exclusive upper limit (this id is not included)
 146          *                   If 0, no upper limit.
 147          */
 148         public function revsByRange( $start, $end ) {
 149                 $condition = 'rev_id >= ' . intval( $start );
 150                 if ( $end ) {
 151                         $condition .= ' AND rev_id < ' . intval( $end );
 152                 }
 153                 $this->dumpFrom( $condition );
 154         }
 155
 156         /**
 157          * @param $title Title
 158          */
 159         public function pageByTitle( $title ) {
 160                 $this->dumpFrom(
 161                         'page_namespace=' . $title->getNamespace() .
 162                         ' AND page_title=' . $this->db->addQuotes( $title->getDBkey() ) );
 163         }
 164
 165         /**
 166          * @param $name string
 167          * @throws MWException
 168          */
 169         public function pageByName( $name ) {
 170                 $title = Title::newFromText( $name );
 171                 if ( is_null( $title ) ) {
 172                         throw new MWException( "Can't export invalid title" );
 173                 } else {
 174                         $this->pageByTitle( $title );
 175                 }
 176         }
 177
 178         /**
 179          * @param $names array
 180          */
 181         public function pagesByName( $names ) {
 182                 foreach ( $names as $name ) {
 183                         $this->pageByName( $name );
 184                 }
 185         }
 186
 187         public function allLogs() {
 188                 $this->dumpFrom( '' );
 189         }
 190
 191         /**
 192          * @param $start int
 193          * @param $end int
 194          */
 195         public function logsByRange( $start, $end ) {
 196                 $condition = 'log_id >= ' . intval( $start );
 197                 if ( $end ) {
 198                         $condition .= ' AND log_id < ' . intval( $end );
 199                 }
 200                 $this->dumpFrom( $condition );
 201         }
 202
 203         /**
 204          * Generates the distinct list of authors of an article
 205          * Not called by default (depends on $this->list_authors)
 206          * Can be set by Special:Export when not exporting whole history
 207          *
 208          * @param $cond
 209          */
 210         protected function do_list_authors( $cond ) {
 211                 wfProfileIn( __METHOD__ );
 212                 $this->author_list = "<contributors>";
 213                 // rev_deleted
 214
 215                 $res = $this->db->select(
 216                         array( 'page', 'revision' ),
 217                         array( 'DISTINCT rev_user_text', 'rev_user' ),
 218                         array(
 219                                 $this->db->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0',
 220                                 $cond,
 221                                 'page_id = rev_id',
 222                         ),
 223                         __METHOD__
 224                 );
 225
 226                 foreach ( $res as $row ) {
 227                         $this->author_list .= "<contributor>" .
 228                                 "<username>" .
 229                                 htmlentities( $row->rev_user_text ) .
 230                                 "</username>" .
 231                                 "<id>" .
 232                                 $row->rev_user .
 233                                 "</id>" .
 234                                 "</contributor>";
 235                 }
 236                 $this->author_list .= "</contributors>";
 237                 wfProfileOut( __METHOD__ );
 238         }
 239
 240         /**
 241          * @param $cond string
 242          * @throws MWException
 243          * @throws Exception
 244          */
 245         protected function dumpFrom( $cond = '' ) {
 246                 wfProfileIn( __METHOD__ );
 247                 # For logging dumps...
 248                 if ( $this->history & self::LOGS ) {
 249                         $where = array( 'user_id = log_user' );
 250                         # Hide private logs
 251                         $hideLogs = LogEventsList::getExcludeClause( $this->db );
 252                         if ( $hideLogs ) $where[] = $hideLogs;
 253                         # Add on any caller specified conditions
 254                         if ( $cond ) $where[] = $cond;
 255                         # Get logging table name for logging.* clause
 256                         $logging = $this->db->tableName( 'logging' );
 257
 258                         if ( $this->buffer == WikiExporter::STREAM ) {
 259                                 $prev = $this->db->bufferResults( false );
 260                         }
 261                         $wrapper = null; // Assuring $wrapper is not undefined, if exception occurs early
 262                         try {
 263                                 $result = $this->db->select( array( 'logging', 'user' ),
 264                                         array( "{$logging}.*", 'user_name' ), // grab the user name
 265                                         $where,
 266                                         __METHOD__,
 267                                         array( 'ORDER BY' => 'log_id', 'USE INDEX' => array( 'logging' => 'PRIMARY' ) )
 268                                 );
 269                                 $wrapper = $this->db->resultObject( $result );
 270                                 $this->outputLogStream( $wrapper );
 271                                 if ( $this->buffer == WikiExporter::STREAM ) {
 272                                         $this->db->bufferResults( $prev );
 273                                 }
 274                         } catch ( Exception $e ) {
 275                                 // Throwing the exception does not reliably free the resultset, and
 276                                 // would also leave the connection in unbuffered mode.
 277
 278                                 // Freeing result
 279                                 try {
 280                                         if ( $wrapper ) {
 281                                                 $wrapper->free();
 282                                         }
 283                                 } catch ( Exception $e2 ) {
 284                                         // Already in panic mode -> ignoring $e2 as $e has
 285                                         // higher priority
 286                                 }
 287
 288                                 // Putting database back in previous buffer mode
 289                                 try {
 290                                         if ( $this->buffer == WikiExporter::STREAM ) {
 291                                                 $this->db->bufferResults( $prev );
 292                                         }
 293                                 } catch ( Exception $e2 ) {
 294                                         // Already in panic mode -> ignoring $e2 as $e has
 295                                         // higher priority
 296                                 }
 297
 298                                 // Inform caller about problem
 299                                 throw $e;
 300                         }
 301                 # For page dumps...
 302                 } else {
 303                         $tables = array( 'page', 'revision' );
 304                         $opts = array( 'ORDER BY' => 'page_id ASC' );
 305                         $opts['USE INDEX'] = array();
 306                         $join = array();
 307                         if ( is_array( $this->history ) ) {
 308                                 # Time offset/limit for all pages/history...
 309                                 $revJoin = 'page_id=rev_page';
 310                                 # Set time order
 311                                 if ( $this->history['dir'] == 'asc' ) {
 312                                         $op = '>';
 313                                         $opts['ORDER BY'] = 'rev_timestamp ASC';
 314                                 } else {
 315                                         $op = '<';
 316                                         $opts['ORDER BY'] = 'rev_timestamp DESC';
 317                                 }
 318                                 # Set offset
 319                                 if ( !empty( $this->history['offset'] ) ) {
 320                                         $revJoin .= " AND rev_timestamp $op " .
 321                                                 $this->db->addQuotes( $this->db->timestamp( $this->history['offset'] ) );
 322                                 }
 323                                 $join['revision'] = array( 'INNER JOIN', $revJoin );
 324                                 # Set query limit
 325                                 if ( !empty( $this->history['limit'] ) ) {
 326                                         $opts['LIMIT'] = intval( $this->history['limit'] );
 327                                 }
 328                         } elseif ( $this->history & WikiExporter::FULL ) {
 329                                 # Full history dumps...
 330                                 $join['revision'] = array( 'INNER JOIN', 'page_id=rev_page' );
 331                         } elseif ( $this->history & WikiExporter::CURRENT ) {
 332                                 # Latest revision dumps...
 333                                 if ( $this->list_authors && $cond != '' ) { // List authors, if so desired
 334                                         $this->do_list_authors( $cond );
 335                                 }
 336                                 $join['revision'] = array( 'INNER JOIN', 'page_id=rev_page AND page_latest=rev_id' );
 337                         } elseif ( $this->history & WikiExporter::STABLE ) {
 338                                 # "Stable" revision dumps...
 339                                 # Default JOIN, to be overridden...
 340                                 $join['revision'] = array( 'INNER JOIN', 'page_id=rev_page AND page_latest=rev_id' );
 341                                 # One, and only one hook should set this, and return false
 342                                 if ( wfRunHooks( 'WikiExporter::dumpStableQuery', array( &$tables, &$opts, &$join ) ) ) {
 343                                         wfProfileOut( __METHOD__ );
 344                                         throw new MWException( __METHOD__ . " given invalid history dump type." );
 345                                 }
 346                         } elseif ( $this->history & WikiExporter::RANGE ) {
 347                                 # Dump of revisions within a specified range
 348                                 $join['revision'] = array( 'INNER JOIN', 'page_id=rev_page' );
 349                                 $opts['ORDER BY'] = array( 'rev_page ASC', 'rev_id ASC' );
 350                         } else {
 351                                 # Unknown history specification parameter?
 352                                 wfProfileOut( __METHOD__ );
 353                                 throw new MWException( __METHOD__ . " given invalid history dump type." );
 354                         }
 355                         # Query optimization hacks
 356                         if ( $cond == '' ) {
 357                                 $opts[] = 'STRAIGHT_JOIN';
 358                                 $opts['USE INDEX']['page'] = 'PRIMARY';
 359                         }
 360                         # Build text join options
 361                         if ( $this->text != WikiExporter::STUB ) { // 1-pass
 362                                 $tables[] = 'text';
 363                                 $join['text'] = array( 'INNER JOIN', 'rev_text_id=old_id' );
 364                         }
 365
 366                         if ( $this->buffer == WikiExporter::STREAM ) {
 367                                 $prev = $this->db->bufferResults( false );
 368                         }
 369
 370                         $wrapper = null; // Assuring $wrapper is not undefined, if exception occurs early
 371                         try {
 372                                 wfRunHooks( 'ModifyExportQuery',
 373                                                 array( $this->db, &$tables, &$cond, &$opts, &$join ) );
 374
 375                                 # Do the query!
 376                                 $result = $this->db->select( $tables, '*', $cond, __METHOD__, $opts, $join );
 377                                 $wrapper = $this->db->resultObject( $result );
 378                                 # Output dump results
 379                                 $this->outputPageStream( $wrapper );
 380
 381                                 if ( $this->buffer == WikiExporter::STREAM ) {
 382                                         $this->db->bufferResults( $prev );
 383                                 }
 384                         } catch ( Exception $e ) {
 385                                 // Throwing the exception does not reliably free the resultset, and
 386                                 // would also leave the connection in unbuffered mode.
 387
 388                                 // Freeing result
 389                                 try {
 390                                         if ( $wrapper ) {
 391                                                 $wrapper->free();
 392                                         }
 393                                 } catch ( Exception $e2 ) {
 394                                         // Already in panic mode -> ignoring $e2 as $e has
 395                                         // higher priority
 396                                 }
 397
 398                                 // Putting database back in previous buffer mode
 399                                 try {
 400                                         if ( $this->buffer == WikiExporter::STREAM ) {
 401                                                 $this->db->bufferResults( $prev );
 402                                         }
 403                                 } catch ( Exception $e2 ) {
 404                                         // Already in panic mode -> ignoring $e2 as $e has
 405                                         // higher priority
 406                                 }
 407
 408                                 // Inform caller about problem
 409                                 throw $e;
 410                         }
 411                 }
 412                 wfProfileOut( __METHOD__ );
 413         }
 414
 415         /**
 416          * Runs through a query result set dumping page and revision records.
 417          * The result set should be sorted/grouped by page to avoid duplicate
 418          * page records in the output.
 419          *
 420          * Should be safe for
 421          * streaming (non-buffered) queries, as long as it was made on a
 422          * separate database connection not managed by LoadBalancer; some
 423          * blob storage types will make queries to pull source data.
 424          *
 425          * @param $resultset ResultWrapper
 426          */
 427         protected function outputPageStream( $resultset ) {
 428                 $last = null;
 429                 foreach ( $resultset as $row ) {
 430                         if ( $last === null ||
 431                                 $last->page_namespace != $row->page_namespace ||
 432                                 $last->page_title != $row->page_title ) {
 433                                 if ( $last !== null ) {
 434                                         $output = '';
 435                                         if ( $this->dumpUploads ) {
 436                                                 $output .= $this->writer->writeUploads( $last, $this->dumpUploadFileContents );
 437                                         }
 438                                         $output .= $this->writer->closePage();
 439                                         $this->sink->writeClosePage( $output );
 440                                 }
 441                                 $output = $this->writer->openPage( $row );
 442                                 $this->sink->writeOpenPage( $row, $output );
 443                                 $last = $row;
 444                         }
 445                         $output = $this->writer->writeRevision( $row );
 446                         $this->sink->writeRevision( $row, $output );
 447                 }
 448                 if ( $last !== null ) {
 449                         $output = '';
 450                         if ( $this->dumpUploads ) {
 451                                 $output .= $this->writer->writeUploads( $last, $this->dumpUploadFileContents );
 452                         }
 453                         $output .= $this->author_list;
 454                         $output .= $this->writer->closePage();
 455                         $this->sink->writeClosePage( $output );
 456                 }
 457         }
 458
 459         /**
 460          * @param $resultset array
 461          */
 462         protected function outputLogStream( $resultset ) {
 463                 foreach ( $resultset as $row ) {
 464                         $output = $this->writer->writeLogItem( $row );
 465                         $this->sink->writeLogItem( $row, $output );
 466                 }
 467         }
 468 }
 469
 470 /**
 471  * @ingroup Dump
 472  */
 473 class XmlDumpWriter {
 474         /**
 475          * Returns the export schema version.
 476          * @deprecated in 1.20; use WikiExporter::schemaVersion() instead
 477          * @return string
 478          */
 479         function schemaVersion() {
 480                 wfDeprecated( __METHOD__, '1.20' );
 481                 return WikiExporter::schemaVersion();
 482         }
 483
 484         /**
 485          * Opens the XML output stream's root "<mediawiki>" element.
 486          * This does not include an xml directive, so is safe to include
 487          * as a subelement in a larger XML stream. Namespace and XML Schema
 488          * references are included.
 489          *
 490          * Output will be encoded in UTF-8.
 491          *
 492          * @return string
 493          */
 494         function openStream() {
 495                 global $wgLanguageCode;
 496                 $ver = WikiExporter::schemaVersion();
 497                 return Xml::element( 'mediawiki', array(
 498                         'xmlns'              => "http://www.mediawiki.org/xml/export-$ver/",
 499                         'xmlns:xsi'          => "http://www.w3.org/2001/XMLSchema-instance",
 500                         'xsi:schemaLocation' => "http://www.mediawiki.org/xml/export-$ver/ " .
 501                                                 "http://www.mediawiki.org/xml/export-$ver.xsd", #TODO: how do we get a new version up there?
 502                         'version'            => $ver,
 503                         'xml:lang'           => $wgLanguageCode ),
 504                         null ) .
 505                         "\n" .
 506                         $this->siteInfo();
 507         }
 508
 509         /**
 510          * @return string
 511          */
 512         function siteInfo() {
 513                 $info = array(
 514                         $this->sitename(),
 515                         $this->homelink(),
 516                         $this->generator(),
 517                         $this->caseSetting(),
 518                         $this->namespaces() );
 519                 return "  <siteinfo>\n    " .
 520                         implode( "\n    ", $info ) .
 521                         "\n  </siteinfo>\n";
 522         }
 523
 524         /**
 525          * @return string
 526          */
 527         function sitename() {
 528                 global $wgSitename;
 529                 return Xml::element( 'sitename', array(), $wgSitename );
 530         }
 531
 532         /**
 533          * @return string
 534          */
 535         function generator() {
 536                 global $wgVersion;
 537                 return Xml::element( 'generator', array(), "MediaWiki $wgVersion" );
 538         }
 539
 540         /**
 541          * @return string
 542          */
 543         function homelink() {
 544                 return Xml::element( 'base', array(), Title::newMainPage()->getCanonicalURL() );
 545         }
 546
 547         /**
 548          * @return string
 549          */
 550         function caseSetting() {
 551                 global $wgCapitalLinks;
 552                 // "case-insensitive" option is reserved for future
 553                 $sensitivity = $wgCapitalLinks ? 'first-letter' : 'case-sensitive';
 554                 return Xml::element( 'case', array(), $sensitivity );
 555         }
 556
 557         /**
 558          * @return string
 559          */
 560         function namespaces() {
 561                 global $wgContLang;
 562                 $spaces = "<namespaces>\n";
 563                 foreach ( $wgContLang->getFormattedNamespaces() as $ns => $title ) {
 564                         $spaces .= '      ' .
 565                                 Xml::element( 'namespace',
 566                                         array(
 567                                                 'key' => $ns,
 568                                                 'case' => MWNamespace::isCapitalized( $ns ) ? 'first-letter' : 'case-sensitive',
 569                                         ), $title ) . "\n";
 570                 }
 571                 $spaces .= "    </namespaces>";
 572                 return $spaces;
 573         }
 574
 575         /**
 576          * Closes the output stream with the closing root element.
 577          * Call when finished dumping things.
 578          *
 579          * @return string
 580          */
 581         function closeStream() {
 582                 return "</mediawiki>\n";
 583         }
 584
 585         /**
 586          * Opens a "<page>" section on the output stream, with data
 587          * from the given database row.
 588          *
 589          * @param $row object
 590          * @return string
 591          * @access private
 592          */
 593         function openPage( $row ) {
 594                 $out = "  <page>\n";
 595                 $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 596                 $out .= '    ' . Xml::elementClean( 'title', array(), self::canonicalTitle( $title ) ) . "\n";
 597                 $out .= '    ' . Xml::element( 'ns', array(), strval( $row->page_namespace) ) . "\n";
 598                 $out .= '    ' . Xml::element( 'id', array(), strval( $row->page_id ) ) . "\n";
 599                 if ( $row->page_is_redirect ) {
 600                         $page = WikiPage::factory( $title );
 601                         $redirect = $page->getRedirectTarget();
 602                         if ( $redirect instanceOf Title && $redirect->isValidRedirectTarget() ) {
 603                                 $out .= '    ' . Xml::element( 'redirect', array( 'title' => self::canonicalTitle( $redirect ) ) ) . "\n";
 604                         }
 605                 }
 606
 607                 if ( $row->page_restrictions != '' ) {
 608                         $out .= '    ' . Xml::element( 'restrictions', array(),
 609                                 strval( $row->page_restrictions ) ) . "\n";
 610                 }
 611
 612                 wfRunHooks( 'XmlDumpWriterOpenPage', array( $this, &$out, $row, $title ) );
 613
 614                 return $out;
 615         }
 616
 617         /**
 618          * Closes a "<page>" section on the output stream.
 619          *
 620          * @access private
 621          * @return string
 622          */
 623         function closePage() {
 624                 return "  </page>\n";
 625         }
 626
 627         /**
 628          * Dumps a "<revision>" section on the output stream, with
 629          * data filled in from the given database row.
 630          *
 631          * @param $row object
 632          * @return string
 633          * @access private
 634          */
 635         function writeRevision( $row ) {
 636                 wfProfileIn( __METHOD__ );
 637
 638                 $out = "    <revision>\n";
 639                 $out .= "      " . Xml::element( 'id', null, strval( $row->rev_id ) ) . "\n";
 640                 if( isset( $row->rev_parent_id ) && $row->rev_parent_id ) {
 641                         $out .= "      " . Xml::element( 'parentid', null, strval( $row->rev_parent_id ) ) . "\n";
 642                 }
 643
 644                 $out .= $this->writeTimestamp( $row->rev_timestamp );
 645
 646                 if ( isset( $row->rev_deleted ) && ( $row->rev_deleted & Revision::DELETED_USER ) ) {
 647                         $out .= "      " . Xml::element( 'contributor', array( 'deleted' => 'deleted' ) ) . "\n";
 648                 } else {
 649                         $out .= $this->writeContributor( $row->rev_user, $row->rev_user_text );
 650                 }
 651
 652                 if ( isset( $row->rev_minor_edit ) && $row->rev_minor_edit ) {
 653                         $out .= "      <minor/>\n";
 654                 }
 655                 if ( isset( $row->rev_deleted ) && ( $row->rev_deleted & Revision::DELETED_COMMENT ) ) {
 656                         $out .= "      " . Xml::element( 'comment', array( 'deleted' => 'deleted' ) ) . "\n";
 657                 } elseif ( $row->rev_comment != '' ) {
 658                         $out .= "      " . Xml::elementClean( 'comment', array(), strval( $row->rev_comment ) ) . "\n";
 659                 }
 660
 661                 $text = '';
 662                 if ( isset( $row->rev_deleted ) && ( $row->rev_deleted & Revision::DELETED_TEXT ) ) {
 663                         $out .= "      " . Xml::element( 'text', array( 'deleted' => 'deleted' ) ) . "\n";
 664                 } elseif ( isset( $row->old_text ) ) {
 665                         // Raw text from the database may have invalid chars
 666                         $text = strval( Revision::getRevisionText( $row ) );
 667                         $out .= "      " . Xml::elementClean( 'text',
 668                                 array( 'xml:space' => 'preserve', 'bytes' => intval( $row->rev_len ) ),
 669                                 strval( $text ) ) . "\n";
 670                 } else {
 671                         // Stub output
 672                         $out .= "      " . Xml::element( 'text',
 673                                 array( 'id' => $row->rev_text_id, 'bytes' => intval( $row->rev_len ) ),
 674                                 "" ) . "\n";
 675                 }
 676
 677                 if ( isset( $row->rev_sha1 ) && $row->rev_sha1 && !( $row->rev_deleted & Revision::DELETED_TEXT ) ) {
 678                         $out .= "      " . Xml::element( 'sha1', null, strval( $row->rev_sha1 ) ) . "\n";
 679                 } else {
 680                         $out .= "      <sha1/>\n";
 681                 }
 682
 683                 if ( isset( $row->rev_content_model ) && !is_null( $row->rev_content_model ) ) {
 684                         $content_model = strval( $row->rev_content_model );
 685                 } else {
 686                         // probably using $wgContentHandlerUseDB = false;
 687                         // @todo: test!
 688                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 689                         $content_model = ContentHandler::getDefaultModelFor( $title );
 690                 }
 691
 692                 $out .= "      " . Xml::element( 'model', null, strval( $content_model ) ) . "\n";
 693
 694                 if ( isset( $row->rev_content_format ) && !is_null( $row->rev_content_format ) ) {
 695                         $content_format = strval( $row->rev_content_format );
 696                 } else {
 697                         // probably using $wgContentHandlerUseDB = false;
 698                         // @todo: test!
 699                         $content_handler = ContentHandler::getForModelID( $content_model );
 700                         $content_format = $content_handler->getDefaultFormat();
 701                 }
 702
 703                 $out .= "      " . Xml::element( 'format', null, strval( $content_format ) ) . "\n";
 704
 705                 wfRunHooks( 'XmlDumpWriterWriteRevision', array( &$this, &$out, $row, $text ) );
 706
 707                 $out .= "    </revision>\n";
 708
 709                 wfProfileOut( __METHOD__ );
 710                 return $out;
 711         }
 712
 713         /**
 714          * Dumps a "<logitem>" section on the output stream, with
 715          * data filled in from the given database row.
 716          *
 717          * @param $row object
 718          * @return string
 719          * @access private
 720          */
 721         function writeLogItem( $row ) {
 722                 wfProfileIn( __METHOD__ );
 723
 724                 $out = "  <logitem>\n";
 725                 $out .= "    " . Xml::element( 'id', null, strval( $row->log_id ) ) . "\n";
 726
 727                 $out .= $this->writeTimestamp( $row->log_timestamp, "    " );
 728
 729                 if ( $row->log_deleted & LogPage::DELETED_USER ) {
 730                         $out .= "    " . Xml::element( 'contributor', array( 'deleted' => 'deleted' ) ) . "\n";
 731                 } else {
 732                         $out .= $this->writeContributor( $row->log_user, $row->user_name, "    " );
 733                 }
 734
 735                 if ( $row->log_deleted & LogPage::DELETED_COMMENT ) {
 736                         $out .= "    " . Xml::element( 'comment', array( 'deleted' => 'deleted' ) ) . "\n";
 737                 } elseif ( $row->log_comment != '' ) {
 738                         $out .= "    " . Xml::elementClean( 'comment', null, strval( $row->log_comment ) ) . "\n";
 739                 }
 740
 741                 $out .= "    " . Xml::element( 'type', null, strval( $row->log_type ) ) . "\n";
 742                 $out .= "    " . Xml::element( 'action', null, strval( $row->log_action ) ) . "\n";
 743
 744                 if ( $row->log_deleted & LogPage::DELETED_ACTION ) {
 745                         $out .= "    " . Xml::element( 'text', array( 'deleted' => 'deleted' ) ) . "\n";
 746                 } else {
 747                         $title = Title::makeTitle( $row->log_namespace, $row->log_title );
 748                         $out .= "    " . Xml::elementClean( 'logtitle', null, self::canonicalTitle( $title ) ) . "\n";
 749                         $out .= "    " . Xml::elementClean( 'params',
 750                                 array( 'xml:space' => 'preserve' ),
 751                                 strval( $row->log_params ) ) . "\n";
 752                 }
 753
 754                 $out .= "  </logitem>\n";
 755
 756                 wfProfileOut( __METHOD__ );
 757                 return $out;
 758         }
 759
 760         /**
 761          * @param $timestamp string
 762          * @param string $indent Default to six spaces
 763          * @return string
 764          */
 765         function writeTimestamp( $timestamp, $indent = "      " ) {
 766                 $ts = wfTimestamp( TS_ISO_8601, $timestamp );
 767                 return $indent . Xml::element( 'timestamp', null, $ts ) . "\n";
 768         }
 769
 770         /**
 771          * @param $id
 772          * @param $text string
 773          * @param string $indent Default to six spaces
 774          * @return string
 775          */
 776         function writeContributor( $id, $text, $indent = "      " ) {
 777                 $out = $indent . "<contributor>\n";
 778                 if ( $id || !IP::isValid( $text ) ) {
 779                         $out .= $indent . "  " . Xml::elementClean( 'username', null, strval( $text ) ) . "\n";
 780                         $out .= $indent . "  " . Xml::element( 'id', null, strval( $id ) ) . "\n";
 781                 } else {
 782                         $out .= $indent . "  " . Xml::elementClean( 'ip', null, strval( $text ) ) . "\n";
 783                 }
 784                 $out .= $indent . "</contributor>\n";
 785                 return $out;
 786         }
 787
 788         /**
 789          * Warning! This data is potentially inconsistent. :(
 790          * @param $row
 791          * @param $dumpContents bool
 792          * @return string
 793          */
 794         function writeUploads( $row, $dumpContents = false ) {
 795                 if ( $row->page_namespace == NS_FILE ) {
 796                         $img = wfLocalFile( $row->page_title );
 797                         if ( $img && $img->exists() ) {
 798                                 $out = '';
 799                                 foreach ( array_reverse( $img->getHistory() ) as $ver ) {
 800                                         $out .= $this->writeUpload( $ver, $dumpContents );
 801                                 }
 802                                 $out .= $this->writeUpload( $img, $dumpContents );
 803                                 return $out;
 804                         }
 805                 }
 806                 return '';
 807         }
 808
 809         /**
 810          * @param $file File
 811          * @param $dumpContents bool
 812          * @return string
 813          */
 814         function writeUpload( $file, $dumpContents = false ) {
 815                 if ( $file->isOld() ) {
 816                         $archiveName = "      " .
 817                                 Xml::element( 'archivename', null, $file->getArchiveName() ) . "\n";
 818                 } else {
 819                         $archiveName = '';
 820                 }
 821                 if ( $dumpContents ) {
 822                         # Dump file as base64
 823                         # Uses only XML-safe characters, so does not need escaping
 824                         $contents = '      <contents encoding="base64">' .
 825                                 chunk_split( base64_encode( file_get_contents( $file->getPath() ) ) ) .
 826                                 "      </contents>\n";
 827                 } else {
 828                         $contents = '';
 829                 }
 830                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
 831                         $comment = Xml::element( 'comment', array( 'deleted' => 'deleted' ) );
 832                 } else {
 833                         $comment = Xml::elementClean( 'comment', null, $file->getDescription() );
 834                 }
 835                 return "    <upload>\n" .
 836                         $this->writeTimestamp( $file->getTimestamp() ) .
 837                         $this->writeContributor( $file->getUser( 'id' ), $file->getUser( 'text' ) ) .
 838                         "      " . $comment . "\n" .
 839                         "      " . Xml::element( 'filename', null, $file->getName() ) . "\n" .
 840                         $archiveName .
 841                         "      " . Xml::element( 'src', null, $file->getCanonicalURL() ) . "\n" .
 842                         "      " . Xml::element( 'size', null, $file->getSize() ) . "\n" .
 843                         "      " . Xml::element( 'sha1base36', null, $file->getSha1() ) . "\n" .
 844                         "      " . Xml::element( 'rel', null, $file->getRel() ) . "\n" .
 845                         $contents .
 846                         "    </upload>\n";
 847         }
 848
 849         /**
 850          * Return prefixed text form of title, but using the content language's
 851          * canonical namespace. This skips any special-casing such as gendered
 852          * user namespaces -- which while useful, are not yet listed in the
 853          * XML "<siteinfo>" data so are unsafe in export.
 854          *
 855          * @param Title $title
 856          * @return string
 857          * @since 1.18
 858          */
 859         public static function canonicalTitle( Title $title ) {
 860                 if ( $title->getInterwiki() ) {
 861                         return $title->getPrefixedText();
 862                 }
 863
 864                 global $wgContLang;
 865                 $prefix = str_replace( '_', ' ', $wgContLang->getNsText( $title->getNamespace() ) );
 866
 867                 if ( $prefix !== '' ) {
 868                         $prefix .= ':';
 869                 }
 870
 871                 return $prefix . $title->getText();
 872         }
 873 }
 874
 875 /**
 876  * Base class for output stream; prints to stdout or buffer or wherever.
 877  * @ingroup Dump
 878  */
 879 class DumpOutput {
 880
 881         /**
 882          * @param $string string
 883          */
 884         function writeOpenStream( $string ) {
 885                 $this->write( $string );
 886         }
 887
 888         /**
 889          * @param $string string
 890          */
 891         function writeCloseStream( $string ) {
 892                 $this->write( $string );
 893         }
 894
 895         /**
 896          * @param $page
 897          * @param $string string
 898          */
 899         function writeOpenPage( $page, $string ) {
 900                 $this->write( $string );
 901         }
 902
 903         /**
 904          * @param $string string
 905          */
 906         function writeClosePage( $string ) {
 907                 $this->write( $string );
 908         }
 909
 910         /**
 911          * @param $rev
 912          * @param $string string
 913          */
 914         function writeRevision( $rev, $string ) {
 915                 $this->write( $string );
 916         }
 917
 918         /**
 919          * @param $rev
 920          * @param $string string
 921          */
 922         function writeLogItem( $rev, $string ) {
 923                 $this->write( $string );
 924         }
 925
 926         /**
 927          * Override to write to a different stream type.
 928          * @param $string string
 929          * @return bool
 930          */
 931         function write( $string ) {
 932                 print $string;
 933         }
 934
 935         /**
 936          * Close the old file, move it to a specified name,
 937          * and reopen new file with the old name. Use this
 938          * for writing out a file in multiple pieces
 939          * at specified checkpoints (e.g. every n hours).
 940          * @param $newname mixed File name. May be a string or an array with one element
 941          */
 942         function closeRenameAndReopen( $newname ) {
 943         }
 944
 945         /**
 946          * Close the old file, and move it to a specified name.
 947          * Use this for the last piece of a file written out
 948          * at specified checkpoints (e.g. every n hours).
 949          * @param $newname mixed File name. May be a string or an array with one element
 950          * @param bool $open If true, a new file with the old filename will be opened again for writing (default: false)
 951          */
 952         function closeAndRename( $newname, $open = false ) {
 953         }
 954
 955         /**
 956          * Returns the name of the file or files which are
 957          * being written to, if there are any.
 958          * @return null
 959          */
 960         function getFilenames() {
 961                 return null;
 962         }
 963 }
 964
 965 /**
 966  * Stream outputter to send data to a file.
 967  * @ingroup Dump
 968  */
 969 class DumpFileOutput extends DumpOutput {
 970         protected $handle = false, $filename;
 971
 972         /**
 973          * @param $file
 974          */
 975         function __construct( $file ) {
 976                 $this->handle = fopen( $file, "wt" );
 977                 $this->filename = $file;
 978         }
 979
 980         /**
 981          * @param $string string
 982          */
 983         function writeCloseStream( $string ) {
 984                 parent::writeCloseStream( $string );
 985                 if ( $this->handle ) {
 986                         fclose( $this->handle );
 987                         $this->handle = false;
 988                 }
 989         }
 990
 991         /**
 992          * @param $string string
 993          */
 994         function write( $string ) {
 995                 fputs( $this->handle, $string );
 996         }
 997
 998         /**
 999          * @param $newname
1000          */
1001         function closeRenameAndReopen( $newname ) {
1002                 $this->closeAndRename( $newname, true );
1003         }
1004
1005         /**
1006          * @param $newname
1007          * @throws MWException
1008          */
1009         function renameOrException( $newname ) {
1010                         if ( !rename( $this->filename, $newname ) ) {
1011                                 throw new MWException( __METHOD__ . ": rename of file {$this->filename} to $newname failed\n" );
1012                         }
1013         }
1014
1015         /**
1016          * @param $newname array
1017          * @return mixed
1018          * @throws MWException
1019          */
1020         function checkRenameArgCount( $newname ) {
1021                 if ( is_array( $newname ) ) {
1022                         if ( count( $newname ) > 1 ) {
1023                                 throw new MWException( __METHOD__ . ": passed multiple arguments for rename of single file\n" );
1024                         } else {
1025                                 $newname = $newname[0];
1026                         }
1027                 }
1028                 return $newname;
1029         }
1030
1031         /**
1032          * @param $newname mixed
1033          * @param $open bool
1034          */
1035         function closeAndRename( $newname, $open = false ) {
1036                 $newname = $this->checkRenameArgCount( $newname );
1037                 if ( $newname ) {
1038                         if ( $this->handle ) {
1039                                 fclose( $this->handle );
1040                                 $this->handle = false;
1041                         }
1042                         $this->renameOrException( $newname );
1043                         if ( $open ) {
1044                                 $this->handle = fopen( $this->filename, "wt" );
1045                         }
1046                 }
1047         }
1048
1049         /**
1050          * @return string|null
1051          */
1052         function getFilenames() {
1053                 return $this->filename;
1054         }
1055 }
1056
1057 /**
1058  * Stream outputter to send data to a file via some filter program.
1059  * Even if compression is available in a library, using a separate
1060  * program can allow us to make use of a multi-processor system.
1061  * @ingroup Dump
1062  */
1063 class DumpPipeOutput extends DumpFileOutput {
1064         protected $command, $filename;
1065         protected $procOpenResource = false;
1066
1067         /**
1068          * @param $command
1069          * @param $file null
1070          */
1071         function __construct( $command, $file = null ) {
1072                 if ( !is_null( $file ) ) {
1073                         $command .= " > " . wfEscapeShellArg( $file );
1074                 }
1075
1076                 $this->startCommand( $command );
1077                 $this->command = $command;
1078                 $this->filename = $file;
1079         }
1080
1081         /**
1082          * @param $string string
1083          */
1084         function writeCloseStream( $string ) {
1085                 parent::writeCloseStream( $string );
1086                 if ( $this->procOpenResource ) {
1087                         proc_close( $this->procOpenResource );
1088                         $this->procOpenResource = false;
1089                 }
1090         }
1091
1092         /**
1093          * @param $command
1094          */
1095         function startCommand( $command ) {
1096                 $spec = array(
1097                         0 => array( "pipe", "r" ),
1098                 );
1099                 $pipes = array();
1100                 $this->procOpenResource = proc_open( $command, $spec, $pipes );
1101                 $this->handle = $pipes[0];
1102         }
1103
1104         /**
1105          * @param mixed $newname
1106          */
1107         function closeRenameAndReopen( $newname ) {
1108                 $this->closeAndRename( $newname, true );
1109         }
1110
1111         /**
1112          * @param $newname mixed
1113          * @param $open bool
1114          */
1115         function closeAndRename( $newname, $open = false ) {
1116                 $newname = $this->checkRenameArgCount( $newname );
1117                 if ( $newname ) {
1118                         if ( $this->handle ) {
1119                                 fclose( $this->handle );
1120                                 $this->handle = false;
1121                         }
1122                         if ( $this->procOpenResource ) {
1123                                 proc_close( $this->procOpenResource );
1124                                 $this->procOpenResource = false;
1125                         }
1126                         $this->renameOrException( $newname );
1127                         if ( $open ) {
1128                                 $command = $this->command;
1129                                 $command .= " > " . wfEscapeShellArg( $this->filename );
1130                                 $this->startCommand( $command );
1131                         }
1132                 }
1133         }
1134
1135 }
1136
1137 /**
1138  * Sends dump output via the gzip compressor.
1139  * @ingroup Dump
1140  */
1141 class DumpGZipOutput extends DumpPipeOutput {
1142
1143         /**
1144          * @param $file string
1145          */
1146         function __construct( $file ) {
1147                 parent::__construct( "gzip", $file );
1148         }
1149 }
1150
1151 /**
1152  * Sends dump output via the bgzip2 compressor.
1153  * @ingroup Dump
1154  */
1155 class DumpBZip2Output extends DumpPipeOutput {
1156
1157         /**
1158          * @param $file string
1159          */
1160         function __construct( $file ) {
1161                 parent::__construct( "bzip2", $file );
1162         }
1163 }
1164
1165 /**
1166  * Sends dump output via the p7zip compressor.
1167  * @ingroup Dump
1168  */
1169 class Dump7ZipOutput extends DumpPipeOutput {
1170
1171         /**
1172          * @param $file string
1173          */
1174         function __construct( $file ) {
1175                 $command = $this->setup7zCommand( $file );
1176                 parent::__construct( $command );
1177                 $this->filename = $file;
1178         }
1179
1180         /**
1181          * @param $file string
1182          * @return string
1183          */
1184         function setup7zCommand( $file ) {
1185                 $command = "7za a -bd -si " . wfEscapeShellArg( $file );
1186                 // Suppress annoying useless crap from p7zip
1187                 // Unfortunately this could suppress real error messages too
1188                 $command .= ' >' . wfGetNull() . ' 2>&1';
1189                 return( $command );
1190         }
1191
1192         /**
1193          * @param $newname string
1194          * @param $open bool
1195          */
1196         function closeAndRename( $newname, $open = false ) {
1197                 $newname = $this->checkRenameArgCount( $newname );
1198                 if ( $newname ) {
1199                         fclose( $this->handle );
1200                         proc_close( $this->procOpenResource );
1201                         $this->renameOrException( $newname );
1202                         if ( $open ) {
1203                                 $command = $this->setup7zCommand( $this->filename );
1204                                 $this->startCommand( $command );
1205                         }
1206                 }
1207         }
1208 }
1209
1210 /**
1211  * Dump output filter class.
1212  * This just does output filtering and streaming; XML formatting is done
1213  * higher up, so be careful in what you do.
1214  * @ingroup Dump
1215  */
1216 class DumpFilter {
1217
1218         /**
1219          * @var DumpOutput
1220          * FIXME will need to be made protected whenever legacy code
1221          * is updated.
1222          */
1223         public $sink;
1224
1225         /**
1226          * @var bool
1227          */
1228         protected $sendingThisPage;
1229
1230         /**
1231          * @param $sink DumpOutput
1232          */
1233         function __construct( &$sink ) {
1234                 $this->sink =& $sink;
1235         }
1236
1237         /**
1238          * @param $string string
1239          */
1240         function writeOpenStream( $string ) {
1241                 $this->sink->writeOpenStream( $string );
1242         }
1243
1244         /**
1245          * @param $string string
1246          */
1247         function writeCloseStream( $string ) {
1248                 $this->sink->writeCloseStream( $string );
1249         }
1250
1251         /**
1252          * @param $page
1253          * @param $string string
1254          */
1255         function writeOpenPage( $page, $string ) {
1256                 $this->sendingThisPage = $this->pass( $page, $string );
1257                 if ( $this->sendingThisPage ) {
1258                         $this->sink->writeOpenPage( $page, $string );
1259                 }
1260         }
1261
1262         /**
1263          * @param $string string
1264          */
1265         function writeClosePage( $string ) {
1266                 if ( $this->sendingThisPage ) {
1267                         $this->sink->writeClosePage( $string );
1268                         $this->sendingThisPage = false;
1269                 }
1270         }
1271
1272         /**
1273          * @param $rev
1274          * @param $string string
1275          */
1276         function writeRevision( $rev, $string ) {
1277                 if ( $this->sendingThisPage ) {
1278                         $this->sink->writeRevision( $rev, $string );
1279                 }
1280         }
1281
1282         /**
1283          * @param $rev
1284          * @param $string string
1285          */
1286         function writeLogItem( $rev, $string ) {
1287                 $this->sink->writeRevision( $rev, $string );
1288         }
1289
1290         /**
1291          * @param $newname string
1292          */
1293         function closeRenameAndReopen( $newname ) {
1294                 $this->sink->closeRenameAndReopen( $newname );
1295         }
1296
1297         /**
1298          * @param $newname string
1299          * @param $open bool
1300          */
1301         function closeAndRename( $newname, $open = false ) {
1302                 $this->sink->closeAndRename( $newname, $open );
1303         }
1304
1305         /**
1306          * @return array
1307          */
1308         function getFilenames() {
1309                 return $this->sink->getFilenames();
1310         }
1311
1312         /**
1313          * Override for page-based filter types.
1314          * @param $page
1315          * @return bool
1316          */
1317         function pass( $page ) {
1318                 return true;
1319         }
1320 }
1321
1322 /**
1323  * Simple dump output filter to exclude all talk pages.
1324  * @ingroup Dump
1325  */
1326 class DumpNotalkFilter extends DumpFilter {
1327
1328         /**
1329          * @param $page
1330          * @return bool
1331          */
1332         function pass( $page ) {
1333                 return !MWNamespace::isTalk( $page->page_namespace );
1334         }
1335 }
1336
1337 /**
1338  * Dump output filter to include or exclude pages in a given set of namespaces.
1339  * @ingroup Dump
1340  */
1341 class DumpNamespaceFilter extends DumpFilter {
1342         var $invert = false;
1343         var $namespaces = array();
1344
1345         /**
1346          * @param $sink DumpOutput
1347          * @param $param
1348          * @throws MWException
1349          */
1350         function __construct( &$sink, $param ) {
1351                 parent::__construct( $sink );
1352
1353                 $constants = array(
1354                         "NS_MAIN"           => NS_MAIN,
1355                         "NS_TALK"           => NS_TALK,
1356                         "NS_USER"           => NS_USER,
1357                         "NS_USER_TALK"      => NS_USER_TALK,
1358                         "NS_PROJECT"        => NS_PROJECT,
1359                         "NS_PROJECT_TALK"   => NS_PROJECT_TALK,
1360                         "NS_FILE"           => NS_FILE,
1361                         "NS_FILE_TALK"      => NS_FILE_TALK,
1362                         "NS_IMAGE"          => NS_IMAGE, // NS_IMAGE is an alias for NS_FILE
1363                         "NS_IMAGE_TALK"     => NS_IMAGE_TALK,
1364                         "NS_MEDIAWIKI"      => NS_MEDIAWIKI,
1365                         "NS_MEDIAWIKI_TALK" => NS_MEDIAWIKI_TALK,
1366                         "NS_TEMPLATE"       => NS_TEMPLATE,
1367                         "NS_TEMPLATE_TALK"  => NS_TEMPLATE_TALK,
1368                         "NS_HELP"           => NS_HELP,
1369                         "NS_HELP_TALK"      => NS_HELP_TALK,
1370                         "NS_CATEGORY"       => NS_CATEGORY,
1371                         "NS_CATEGORY_TALK"  => NS_CATEGORY_TALK );
1372
1373                 if ( $param { 0 } == '!' ) {
1374                         $this->invert = true;
1375                         $param = substr( $param, 1 );
1376                 }
1377
1378                 foreach ( explode( ',', $param ) as $key ) {
1379                         $key = trim( $key );
1380                         if ( isset( $constants[$key] ) ) {
1381                                 $ns = $constants[$key];
1382                                 $this->namespaces[$ns] = true;
1383                         } elseif ( is_numeric( $key ) ) {
1384                                 $ns = intval( $key );
1385                                 $this->namespaces[$ns] = true;
1386                         } else {
1387                                 throw new MWException( "Unrecognized namespace key '$key'\n" );
1388                         }
1389                 }
1390         }
1391
1392         /**
1393          * @param $page
1394          * @return bool
1395          */
1396         function pass( $page ) {
1397                 $match = isset( $this->namespaces[$page->page_namespace] );
1398                 return $this->invert xor $match;
1399         }
1400 }
1401
1402 /**
1403  * Dump output filter to include only the last revision in each page sequence.
1404  * @ingroup Dump
1405  */
1406 class DumpLatestFilter extends DumpFilter {
1407         var $page, $pageString, $rev, $revString;
1408
1409         /**
1410          * @param $page
1411          * @param $string string
1412          */
1413         function writeOpenPage( $page, $string ) {
1414                 $this->page = $page;
1415                 $this->pageString = $string;
1416         }
1417
1418         /**
1419          * @param $string string
1420          */
1421         function writeClosePage( $string ) {
1422                 if ( $this->rev ) {
1423                         $this->sink->writeOpenPage( $this->page, $this->pageString );
1424                         $this->sink->writeRevision( $this->rev, $this->revString );
1425                         $this->sink->writeClosePage( $string );
1426                 }
1427                 $this->rev = null;
1428                 $this->revString = null;
1429                 $this->page = null;
1430                 $this->pageString = null;
1431         }
1432
1433         /**
1434          * @param $rev
1435          * @param $string string
1436          */
1437         function writeRevision( $rev, $string ) {
1438                 if ( $rev->rev_id == $this->page->page_latest ) {
1439                         $this->rev = $rev;
1440                         $this->revString = $string;
1441                 }
1442         }
1443 }
1444
1445 /**
1446  * Base class for output stream; prints to stdout or buffer or wherever.
1447  * @ingroup Dump
1448  */
1449 class DumpMultiWriter {
1450
1451         /**
1452          * @param $sinks
1453          */
1454         function __construct( $sinks ) {
1455                 $this->sinks = $sinks;
1456                 $this->count = count( $sinks );
1457         }
1458
1459         /**
1460          * @param $string string
1461          */
1462         function writeOpenStream( $string ) {
1463                 for ( $i = 0; $i < $this->count; $i++ ) {
1464                         $this->sinks[$i]->writeOpenStream( $string );
1465                 }
1466         }
1467
1468         /**
1469          * @param $string string
1470          */
1471         function writeCloseStream( $string ) {
1472                 for ( $i = 0; $i < $this->count; $i++ ) {
1473                         $this->sinks[$i]->writeCloseStream( $string );
1474                 }
1475         }
1476
1477         /**
1478          * @param $page
1479          * @param $string string
1480          */
1481         function writeOpenPage( $page, $string ) {
1482                 for ( $i = 0; $i < $this->count; $i++ ) {
1483                         $this->sinks[$i]->writeOpenPage( $page, $string );
1484                 }
1485         }
1486
1487         /**
1488          * @param $string
1489          */
1490         function writeClosePage( $string ) {
1491                 for ( $i = 0; $i < $this->count; $i++ ) {
1492                         $this->sinks[$i]->writeClosePage( $string );
1493                 }
1494         }
1495
1496         /**
1497          * @param $rev
1498          * @param $string
1499          */
1500         function writeRevision( $rev, $string ) {
1501                 for ( $i = 0; $i < $this->count; $i++ ) {
1502                         $this->sinks[$i]->writeRevision( $rev, $string );
1503                 }
1504         }
1505
1506         /**
1507          * @param $newnames
1508          */
1509         function closeRenameAndReopen( $newnames ) {
1510                 $this->closeAndRename( $newnames, true );
1511         }
1512
1513         /**
1514          * @param $newnames array
1515          * @param bool $open
1516          */
1517         function closeAndRename( $newnames, $open = false ) {
1518                 for ( $i = 0; $i < $this->count; $i++ ) {
1519                         $this->sinks[$i]->closeAndRename( $newnames[$i], $open );
1520                 }
1521         }
1522
1523         /**
1524          * @return array
1525          */
1526         function getFilenames() {
1527                 $filenames = array();
1528                 for ( $i = 0; $i < $this->count; $i++ ) {
1529                         $filenames[] = $this->sinks[$i]->getFilenames();
1530                 }
1531                 return $filenames;
1532         }
1533
1534 }
1535
1536 /**
1537  * @param $string string
1538  * @return string
1539  */
1540 function xmlsafe( $string ) {
1541         wfProfileIn( __FUNCTION__ );
1542
1543         /**
1544          * The page may contain old data which has not been properly normalized.
1545          * Invalid UTF-8 sequences or forbidden control characters will make our
1546          * XML output invalid, so be sure to strip them out.
1547          */
1548         $string = UtfNormal::cleanUp( $string );
1549
1550         $string = htmlspecialchars( $string );
1551         wfProfileOut( __FUNCTION__ );
1552         return $string;
1553 }