includes/Export.php

   1 <?php
   2 # Copyright (C) 2003, 2005, 2006 Brion Vibber <brion@pobox.com>
   3 # http://www.mediawiki.org/
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 2 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License along
  16 # with this program; if not, write to the Free Software Foundation, Inc.,
  17 # 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18 # http://www.gnu.org/copyleft/gpl.html
  19 /**
  20  *
  21  * @package MediaWiki
  22  * @subpackage SpecialPage
  23  */
  24
  25 /** */
  26 require_once( 'Revision.php' );
  27
  28 define( 'MW_EXPORT_FULL',     0 );
  29 define( 'MW_EXPORT_CURRENT',  1 );
  30
  31 define( 'MW_EXPORT_BUFFER',   0 );
  32 define( 'MW_EXPORT_STREAM',   1 );
  33
  34 define( 'MW_EXPORT_TEXT',     0 );
  35 define( 'MW_EXPORT_STUB',     1 );
  36
  37
  38 /**
  39  * @package MediaWiki
  40  * @subpackage SpecialPage
  41  */
  42 class WikiExporter {
  43
  44         var $list_authors = false ; # Return distinct author list (when not returning full history)
  45         var $author_list = "" ;
  46
  47         /**
  48          * If using MW_EXPORT_STREAM to stream a large amount of data,
  49          * provide a database connection which is not managed by
  50          * LoadBalancer to read from: some history blob types will
  51          * make additional queries to pull source data while the
  52          * main query is still running.
  53          *
  54          * @param Database $db
  55          * @param int $history one of MW_EXPORT_FULL or MW_EXPORT_CURRENT
  56          * @param int $buffer one of MW_EXPORT_BUFFER or MW_EXPORT_STREAM
  57          */
  58         function WikiExporter( &$db, $history = MW_EXPORT_CURRENT,
  59                         $buffer = MW_EXPORT_BUFFER, $text = MW_EXPORT_TEXT ) {
  60                 $this->db =& $db;
  61                 $this->history = $history;
  62                 $this->buffer  = $buffer;
  63                 $this->writer  = new XmlDumpWriter();
  64                 $this->sink    = new DumpOutput();
  65                 $this->text    = $text;
  66         }
  67
  68         /**
  69          * Set the DumpOutput or DumpFilter object which will receive
  70          * various row objects and XML output for filtering. Filters
  71          * can be chained or used as callbacks.
  72          *
  73          * @param mixed $callback
  74          */
  75         function setOutputSink( &$sink ) {
  76                 $this->sink =& $sink;
  77         }
  78
  79         function openStream() {
  80                 $output = $this->writer->openStream();
  81                 $this->sink->writeOpenStream( $output );
  82         }
  83
  84         function closeStream() {
  85                 $output = $this->writer->closeStream();
  86                 $this->sink->writeCloseStream( $output );
  87         }
  88
  89         /**
  90          * Dumps a series of page and revision records for all pages
  91          * in the database, either including complete history or only
  92          * the most recent version.
  93          */
  94         function allPages() {
  95                 return $this->dumpFrom( '' );
  96         }
  97
  98         /**
  99          * Dumps a series of page and revision records for those pages
 100          * in the database falling within the page_id range given.
 101          * @param int $start Inclusive lower limit (this id is included)
 102          * @param int $end   Exclusive upper limit (this id is not included)
 103          *                   If 0, no upper limit.
 104          */
 105         function pagesByRange( $start, $end ) {
 106                 $condition = 'page_id >= ' . intval( $start );
 107                 if( $end ) {
 108                         $condition .= ' AND page_id < ' . intval( $end );
 109                 }
 110                 return $this->dumpFrom( $condition );
 111         }
 112
 113         /**
 114          * @param Title $title
 115          */
 116         function pageByTitle( $title ) {
 117                 return $this->dumpFrom(
 118                         'page_namespace=' . $title->getNamespace() .
 119                         ' AND page_title=' . $this->db->addQuotes( $title->getDbKey() ) );
 120         }
 121
 122         function pageByName( $name ) {
 123                 $title = Title::newFromText( $name );
 124                 if( is_null( $title ) ) {
 125                         return new WikiError( "Can't export invalid title" );
 126                 } else {
 127                         return $this->pageByTitle( $title );
 128                 }
 129         }
 130
 131         function pagesByName( $names ) {
 132                 foreach( $names as $name ) {
 133                         $this->pageByName( $name );
 134                 }
 135         }
 136
 137
 138         // -------------------- private implementation below --------------------
 139
 140         # Generates the distinct list of authors of an article
 141         # Not called by default (depends on $this->list_authors)
 142         # Can be set by Special:Export when not exporting whole history
 143         function do_list_authors ( $page , $revision , $cond ) {
 144                 $fname = "do_list_authors" ;
 145                 wfProfileIn( $fname );
 146                 $this->author_list = "<contributors>";
 147                 $sql = "SELECT DISTINCT rev_user_text,rev_user FROM {$page},{$revision} WHERE page_id=rev_page AND " . $cond ;
 148                 $result = $this->db->query( $sql, $fname );
 149                 $resultset = $this->db->resultObject( $result );
 150                 while( $row = $resultset->fetchObject() ) {
 151                         $this->author_list .= "<contributor>" .
 152                                 "<username>" .
 153                                 htmlentities( $row->rev_user_text )  .
 154                                 "</username>" .
 155                                 "<id>" .
 156                                 $row->rev_user .
 157                                 "</id>" .
 158                                 "</contributor>";
 159                 }
 160                 wfProfileOut( $fname );
 161                 $this->author_list .= "</contributors>";
 162         }
 163
 164         function dumpFrom( $cond = '' ) {
 165                 $fname = 'WikiExporter::dumpFrom';
 166                 wfProfileIn( $fname );
 167
 168                 $page     = $this->db->tableName( 'page' );
 169                 $revision = $this->db->tableName( 'revision' );
 170                 $text     = $this->db->tableName( 'text' );
 171
 172                 if( $this->history == MW_EXPORT_FULL ) {
 173                         $join = 'page_id=rev_page';
 174                 } elseif( $this->history == MW_EXPORT_CURRENT ) {
 175                         if ( $this->list_authors && $cond != '' )  { // List authors, if so desired
 176                                 $this->do_list_authors ( $page , $revision , $cond );
 177                         }
 178                         $join = 'page_id=rev_page AND page_latest=rev_id';
 179                 } else {
 180                         wfProfileOut( $fname );
 181                         return new WikiError( "$fname given invalid history dump type." );
 182                 }
 183                 $where = ( $cond == '' ) ? '' : "$cond AND";
 184
 185                 if( $this->buffer == MW_EXPORT_STREAM ) {
 186                         $prev = $this->db->bufferResults( false );
 187                 }
 188                 if( $cond == '' ) {
 189                         // Optimization hack for full-database dump
 190                         $pageindex = 'FORCE INDEX (PRIMARY)';
 191                         $revindex = 'FORCE INDEX (PRIMARY)';
 192                         $straight = ' /*! STRAIGHT_JOIN */ ';
 193                 } else {
 194                         $pageindex = '';
 195                         $revindex = '';
 196                         $straight = '';
 197                 }
 198                 if( $this->text == MW_EXPORT_STUB ) {
 199                         $sql = "SELECT $straight * FROM
 200                                         $page $pageindex,
 201                                         $revision $revindex
 202                                         WHERE $where $join
 203                                         ORDER BY page_id";
 204                 } else {
 205                         $sql = "SELECT $straight * FROM
 206                                         $page $pageindex,
 207                                         $revision $revindex,
 208                                         $text
 209                                         WHERE $where $join AND rev_text_id=old_id
 210                                         ORDER BY page_id";
 211                 }
 212                 $result = $this->db->query( $sql, $fname );
 213                 $wrapper = $this->db->resultObject( $result );
 214                 $this->outputStream( $wrapper );
 215
 216                 if ( $this->list_authors ) {
 217                         $this->outputStream( $wrapper );
 218                 }
 219
 220                 if( $this->buffer == MW_EXPORT_STREAM ) {
 221                         $this->db->bufferResults( $prev );
 222                 }
 223
 224                 wfProfileOut( $fname );
 225         }
 226
 227         /**
 228          * Runs through a query result set dumping page and revision records.
 229          * The result set should be sorted/grouped by page to avoid duplicate
 230          * page records in the output.
 231          *
 232          * The result set will be freed once complete. Should be safe for
 233          * streaming (non-buffered) queries, as long as it was made on a
 234          * separate database connection not managed by LoadBalancer; some
 235          * blob storage types will make queries to pull source data.
 236          *
 237          * @param ResultWrapper $resultset
 238          * @access private
 239          */
 240         function outputStream( $resultset ) {
 241                 $last = null;
 242                 while( $row = $resultset->fetchObject() ) {
 243                         if( is_null( $last ) ||
 244                                 $last->page_namespace != $row->page_namespace ||
 245                                 $last->page_title     != $row->page_title ) {
 246                                 if( isset( $last ) ) {
 247                                         $output = $this->writer->closePage();
 248                                         $this->sink->writeClosePage( $output );
 249                                 }
 250                                 $output = $this->writer->openPage( $row );
 251                                 $this->sink->writeOpenPage( $row, $output );
 252                                 $last = $row;
 253                         }
 254                         $output = $this->writer->writeRevision( $row );
 255                         $this->sink->writeRevision( $row, $output );
 256                 }
 257                 if( isset( $last ) ) {
 258                         $output = $this->author_list . $this->writer->closePage();
 259                         $this->sink->writeClosePage( $output );
 260                 }
 261                 $resultset->free();
 262         }
 263 }
 264
 265 class XmlDumpWriter {
 266
 267         /**
 268          * Returns the export schema version.
 269          * @return string
 270          */
 271         function schemaVersion() {
 272                 return "0.3"; // FIXME: upgrade to 0.4 when updated XSD is ready, for the revision deletion bits
 273         }
 274
 275         /**
 276          * Opens the XML output stream's root <mediawiki> element.
 277          * This does not include an xml directive, so is safe to include
 278          * as a subelement in a larger XML stream. Namespace and XML Schema
 279          * references are included.
 280          *
 281          * Output will be encoded in UTF-8.
 282          *
 283          * @return string
 284          */
 285         function openStream() {
 286                 global $wgContLanguageCode;
 287                 $ver = $this->schemaVersion();
 288                 return wfElement( 'mediawiki', array(
 289                         'xmlns'              => "http://www.mediawiki.org/xml/export-$ver/",
 290                         'xmlns:xsi'          => "http://www.w3.org/2001/XMLSchema-instance",
 291                         'xsi:schemaLocation' => "http://www.mediawiki.org/xml/export-$ver/ " .
 292                                                 "http://www.mediawiki.org/xml/export-$ver.xsd",
 293                         'version'            => $ver,
 294                         'xml:lang'           => $wgContLanguageCode ),
 295                         null ) .
 296                         "\n" .
 297                         $this->siteInfo();
 298         }
 299
 300         function siteInfo() {
 301                 $info = array(
 302                         $this->sitename(),
 303                         $this->homelink(),
 304                         $this->generator(),
 305                         $this->caseSetting(),
 306                         $this->namespaces() );
 307                 return "  <siteinfo>\n    " .
 308                         implode( "\n    ", $info ) .
 309                         "\n  </siteinfo>\n";
 310         }
 311
 312         function sitename() {
 313                 global $wgSitename;
 314                 return wfElement( 'sitename', array(), $wgSitename );
 315         }
 316
 317         function generator() {
 318                 global $wgVersion;
 319                 return wfElement( 'generator', array(), "MediaWiki $wgVersion" );
 320         }
 321
 322         function homelink() {
 323                 $page = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 324                 return wfElement( 'base', array(), $page->getFullUrl() );
 325         }
 326
 327         function caseSetting() {
 328                 global $wgCapitalLinks;
 329                 // "case-insensitive" option is reserved for future
 330                 $sensitivity = $wgCapitalLinks ? 'first-letter' : 'case-sensitive';
 331                 return wfElement( 'case', array(), $sensitivity );
 332         }
 333
 334         function namespaces() {
 335                 global $wgContLang;
 336                 $spaces = "  <namespaces>\n";
 337                 foreach( $wgContLang->getFormattedNamespaces() as $ns => $title ) {
 338                         $spaces .= '      ' . wfElement( 'namespace', array( 'key' => $ns ), $title ) . "\n";
 339                 }
 340                 $spaces .= "    </namespaces>";
 341                 return $spaces;
 342         }
 343
 344         /**
 345          * Closes the output stream with the closing root element.
 346          * Call when finished dumping things.
 347          */
 348         function closeStream() {
 349                 return "</mediawiki>\n";
 350         }
 351
 352
 353         /**
 354          * Opens a <page> section on the output stream, with data
 355          * from the given database row.
 356          *
 357          * @param object $row
 358          * @return string
 359          * @access private
 360          */
 361         function openPage( $row ) {
 362                 $out = "  <page>\n";
 363                 $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 364                 $out .= '    ' . wfElementClean( 'title', array(), $title->getPrefixedText() ) . "\n";
 365                 $out .= '    ' . wfElement( 'id', array(), strval( $row->page_id ) ) . "\n";
 366                 if( '' != $row->page_restrictions ) {
 367                         $out .= '    ' . wfElement( 'restrictions', array(),
 368                                 strval( $row->page_restrictions ) ) . "\n";
 369                 }
 370                 return $out;
 371         }
 372
 373         /**
 374          * Closes a <page> section on the output stream.
 375          *
 376          * @access private
 377          */
 378         function closePage() {
 379                 return "  </page>\n";
 380         }
 381
 382         /**
 383          * Dumps a <revision> section on the output stream, with
 384          * data filled in from the given database row.
 385          *
 386          * @param object $row
 387          * @return string
 388          * @access private
 389          */
 390         function writeRevision( $row ) {
 391                 $fname = 'WikiExporter::dumpRev';
 392                 wfProfileIn( $fname );
 393
 394                 $out  = "    <revision>\n";
 395                 $out .= "      " . wfElement( 'id', null, strval( $row->rev_id ) ) . "\n";
 396
 397                 $ts = wfTimestamp( TS_ISO_8601, $row->rev_timestamp );
 398                 $out .= "      " . wfElement( 'timestamp', null, $ts ) . "\n";
 399
 400                 if( $row->rev_deleted & MW_REV_DELETED_USER ) {
 401                         $out .= "      " . wfElement( 'contributor', array( 'deleted' => 'deleted' ) ) . "\n";
 402                 } else {
 403                         $out .= "      <contributor>\n";
 404                         if( $row->rev_user ) {
 405                                 $out .= "        " . wfElementClean( 'username', null, strval( $row->rev_user_text ) ) . "\n";
 406                                 $out .= "        " . wfElement( 'id', null, strval( $row->rev_user ) ) . "\n";
 407                         } else {
 408                                 $out .= "        " . wfElementClean( 'ip', null, strval( $row->rev_user_text ) ) . "\n";
 409                         }
 410                         $out .= "      </contributor>\n";
 411                 }
 412
 413                 if( $row->rev_minor_edit ) {
 414                         $out .=  "      <minor/>\n";
 415                 }
 416                 if( $row->rev_deleted & MW_REV_DELETED_COMMENT ) {
 417                         $out .= "      " . wfElement( 'comment', array( 'deleted' => 'deleted' ) ) . "\n";
 418                 } elseif( $row->rev_comment != '' ) {
 419                         $out .= "      " . wfElementClean( 'comment', null, strval( $row->rev_comment ) ) . "\n";
 420                 }
 421
 422                 if( $row->rev_deleted & MW_REV_DELETED_TEXT ) {
 423                         $out .= "      " . wfElement( 'text', array( 'deleted' => 'deleted' ) ) . "\n";
 424                 } elseif( isset( $row->old_text ) ) {
 425                         // Raw text from the database may have invalid chars
 426                         $text = strval( Revision::getRevisionText( $row ) );
 427                         $out .= "      " . wfElementClean( 'text',
 428                                 array( 'xml:space' => 'preserve' ),
 429                                 strval( $text ) ) . "\n";
 430                 } else {
 431                         // Stub output
 432                         $out .= "      " . wfElement( 'text',
 433                                 array( 'id' => $row->rev_text_id ),
 434                                 "" ) . "\n";
 435                 }
 436
 437                 $out .= "    </revision>\n";
 438
 439                 wfProfileOut( $fname );
 440                 return $out;
 441         }
 442
 443 }
 444
 445
 446 /**
 447  * Base class for output stream; prints to stdout or buffer or whereever.
 448  */
 449 class DumpOutput {
 450         function writeOpenStream( $string ) {
 451                 $this->write( $string );
 452         }
 453
 454         function writeCloseStream( $string ) {
 455                 $this->write( $string );
 456         }
 457
 458         function writeOpenPage( $page, $string ) {
 459                 $this->write( $string );
 460         }
 461
 462         function writeClosePage( $string ) {
 463                 $this->write( $string );
 464         }
 465
 466         function writeRevision( $rev, $string ) {
 467                 $this->write( $string );
 468         }
 469
 470         /**
 471          * Override to write to a different stream type.
 472          * @return bool
 473          */
 474         function write( $string ) {
 475                 print $string;
 476         }
 477 }
 478
 479 /**
 480  * Stream outputter to send data to a file.
 481  */
 482 class DumpFileOutput extends DumpOutput {
 483         var $handle;
 484
 485         function DumpFileOutput( $file ) {
 486                 $this->handle = fopen( $file, "wt" );
 487         }
 488
 489         function write( $string ) {
 490                 fputs( $this->handle, $string );
 491         }
 492 }
 493
 494 /**
 495  * Stream outputter to send data to a file via some filter program.
 496  * Even if compression is available in a library, using a separate
 497  * program can allow us to make use of a multi-processor system.
 498  */
 499 class DumpPipeOutput extends DumpFileOutput {
 500         function DumpPipeOutput( $command, $file = null ) {
 501                 if( !is_null( $file ) ) {
 502                         $command .=  " > " . wfEscapeShellArg( $file );
 503                 }
 504                 $this->handle = popen( $command, "w" );
 505         }
 506 }
 507
 508 /**
 509  * Sends dump output via the gzip compressor.
 510  */
 511 class DumpGZipOutput extends DumpPipeOutput {
 512         function DumpGZipOutput( $file ) {
 513                 parent::DumpPipeOutput( "gzip", $file );
 514         }
 515 }
 516
 517 /**
 518  * Sends dump output via the bgzip2 compressor.
 519  */
 520 class DumpBZip2Output extends DumpPipeOutput {
 521         function DumpBZip2Output( $file ) {
 522                 parent::DumpPipeOutput( "bzip2", $file );
 523         }
 524 }
 525
 526 /**
 527  * Sends dump output via the p7zip compressor.
 528  */
 529 class Dump7ZipOutput extends DumpPipeOutput {
 530         function Dump7ZipOutput( $file ) {
 531                 $command = "7za a -bd -si " . wfEscapeShellArg( $file );
 532                 parent::DumpPipeOutput( $command );
 533         }
 534 }
 535
 536
 537
 538 /**
 539  * Dump output filter class.
 540  * This just does output filtering and streaming; XML formatting is done
 541  * higher up, so be careful in what you do.
 542  */
 543 class DumpFilter {
 544         function DumpFilter( &$sink ) {
 545                 $this->sink =& $sink;
 546         }
 547
 548         function writeOpenStream( $string ) {
 549                 $this->sink->writeOpenStream( $string );
 550         }
 551
 552         function writeCloseStream( $string ) {
 553                 $this->sink->writeCloseStream( $string );
 554         }
 555
 556         function writeOpenPage( $page, $string ) {
 557                 $this->sendingThisPage = $this->pass( $page, $string );
 558                 if( $this->sendingThisPage ) {
 559                         $this->sink->writeOpenPage( $page, $string );
 560                 }
 561         }
 562
 563         function writeClosePage( $string ) {
 564                 if( $this->sendingThisPage ) {
 565                         $this->sink->writeClosePage( $string );
 566                         $this->sendingThisPage = false;
 567                 }
 568         }
 569
 570         function writeRevision( $rev, $string ) {
 571                 if( $this->sendingThisPage ) {
 572                         $this->sink->writeRevision( $rev, $string );
 573                 }
 574         }
 575
 576         /**
 577          * Override for page-based filter types.
 578          * @return bool
 579          */
 580         function pass( $page, $string ) {
 581                 return true;
 582         }
 583 }
 584
 585 /**
 586  * Simple dump output filter to exclude all talk pages.
 587  */
 588 class DumpNotalkFilter extends DumpFilter {
 589         function pass( $page ) {
 590                 return !Namespace::isTalk( $page->page_namespace );
 591         }
 592 }
 593
 594 /**
 595  * Dump output filter to include or exclude pages in a given set of namespaces.
 596  */
 597 class DumpNamespaceFilter extends DumpFilter {
 598         var $invert = false;
 599         var $namespaces = array();
 600
 601         function DumpNamespaceFilter( &$sink, $param ) {
 602                 parent::DumpFilter( $sink );
 603
 604                 $constants = array(
 605                         "NS_MAIN"           => NS_MAIN,
 606                         "NS_TALK"           => NS_TALK,
 607                         "NS_USER"           => NS_USER,
 608                         "NS_USER_TALK"      => NS_USER_TALK,
 609                         "NS_PROJECT"        => NS_PROJECT,
 610                         "NS_PROJECT_TALK"   => NS_PROJECT_TALK,
 611                         "NS_IMAGE"          => NS_IMAGE,
 612                         "NS_IMAGE_TALK"     => NS_IMAGE_TALK,
 613                         "NS_MEDIAWIKI"      => NS_MEDIAWIKI,
 614                         "NS_MEDIAWIKI_TALK" => NS_MEDIAWIKI_TALK,
 615                         "NS_TEMPLATE"       => NS_TEMPLATE,
 616                         "NS_TEMPLATE_TALK"  => NS_TEMPLATE_TALK,
 617                         "NS_HELP"           => NS_HELP,
 618                         "NS_HELP_TALK"      => NS_HELP_TALK,
 619                         "NS_CATEGORY"       => NS_CATEGORY,
 620                         "NS_CATEGORY_TALK"  => NS_CATEGORY_TALK );
 621
 622                 if( $param{0} == '!' ) {
 623                         $this->invert = true;
 624                         $param = substr( $param, 1 );
 625                 }
 626
 627                 foreach( explode( ',', $param ) as $key ) {
 628                         $key = trim( $key );
 629                         if( isset( $constants[$key] ) ) {
 630                                 $ns = $constants[$key];
 631                                 $this->namespaces[$ns] = true;
 632                         } elseif( is_numeric( $key ) ) {
 633                                 $ns = intval( $key );
 634                                 $this->namespaces[$ns] = true;
 635                         } else {
 636                                 wfDie( "Unrecognized namespace key '$key'\n" );
 637                         }
 638                 }
 639         }
 640
 641         function pass( $page ) {
 642                 $match = isset( $this->namespaces[$page->page_namespace] );
 643                 return $this->invert xor $match;
 644         }
 645 }
 646
 647
 648 /**
 649  * Dump output filter to include only the last revision in each page sequence.
 650  */
 651 class DumpLatestFilter extends DumpFilter {
 652         var $page, $pageString, $rev, $revString;
 653
 654         function writeOpenPage( $page, $string ) {
 655                 $this->page = $page;
 656                 $this->pageString = $string;
 657         }
 658
 659         function writeClosePage( $string ) {
 660                 if( $this->rev ) {
 661                         $this->sink->writeOpenPage( $this->page, $this->pageString );
 662                         $this->sink->writeRevision( $this->rev, $this->revString );
 663                         $this->sink->writeClosePage( $string );
 664                 }
 665                 $this->rev = null;
 666                 $this->revString = null;
 667                 $this->page = null;
 668                 $this->pageString = null;
 669         }
 670
 671         function writeRevision( $rev, $string ) {
 672                 if( $rev->rev_id == $this->page->page_latest ) {
 673                         $this->rev = $rev;
 674                         $this->revString = $string;
 675                 }
 676         }
 677 }
 678
 679 /**
 680  * Base class for output stream; prints to stdout or buffer or whereever.
 681  */
 682 class DumpMultiWriter {
 683         function DumpMultiWriter( $sinks ) {
 684                 $this->sinks = $sinks;
 685                 $this->count = count( $sinks );
 686         }
 687
 688         function writeOpenStream( $string ) {
 689                 for( $i = 0; $i < $this->count; $i++ ) {
 690                         $this->sinks[$i]->writeOpenStream( $string );
 691                 }
 692         }
 693
 694         function writeCloseStream( $string ) {
 695                 for( $i = 0; $i < $this->count; $i++ ) {
 696                         $this->sinks[$i]->writeCloseStream( $string );
 697                 }
 698         }
 699
 700         function writeOpenPage( $page, $string ) {
 701                 for( $i = 0; $i < $this->count; $i++ ) {
 702                         $this->sinks[$i]->writeOpenPage( $page, $string );
 703                 }
 704         }
 705
 706         function writeClosePage( $string ) {
 707                 for( $i = 0; $i < $this->count; $i++ ) {
 708                         $this->sinks[$i]->writeClosePage( $string );
 709                 }
 710         }
 711
 712         function writeRevision( $rev, $string ) {
 713                 for( $i = 0; $i < $this->count; $i++ ) {
 714                         $this->sinks[$i]->writeRevision( $rev, $string );
 715                 }
 716         }
 717 }
 718
 719 function xmlsafe( $string ) {
 720         $fname = 'xmlsafe';
 721         wfProfileIn( $fname );
 722
 723         /**
 724          * The page may contain old data which has not been properly normalized.
 725          * Invalid UTF-8 sequences or forbidden control characters will make our
 726          * XML output invalid, so be sure to strip them out.
 727          */
 728         $string = UtfNormal::cleanUp( $string );
 729
 730         $string = htmlspecialchars( $string );
 731         wfProfileOut( $fname );
 732         return $string;
 733 }
 734
 735 ?>