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 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18 # http://www.gnu.org/copyleft/gpl.html
  19 /**
  20  *
  21  * @package MediaWiki
  22  * @subpackage SpecialPage
  23  */
  24
  25 /** */
  26
  27 define( 'MW_EXPORT_FULL',     0 );
  28 define( 'MW_EXPORT_CURRENT',  1 );
  29
  30 define( 'MW_EXPORT_BUFFER',   0 );
  31 define( 'MW_EXPORT_STREAM',   1 );
  32
  33 define( 'MW_EXPORT_TEXT',     0 );
  34 define( 'MW_EXPORT_STUB',     1 );
  35
  36
  37 /**
  38  * @package MediaWiki
  39  * @subpackage SpecialPage
  40  */
  41 class WikiExporter {
  42
  43         var $list_authors = false ; # Return distinct author list (when not returning full history)
  44         var $author_list = "" ;
  45
  46         /**
  47          * If using MW_EXPORT_STREAM to stream a large amount of data,
  48          * provide a database connection which is not managed by
  49          * LoadBalancer to read from: some history blob types will
  50          * make additional queries to pull source data while the
  51          * main query is still running.
  52          *
  53          * @param Database $db
  54          * @param int $history one of MW_EXPORT_FULL or MW_EXPORT_CURRENT
  55          * @param int $buffer one of MW_EXPORT_BUFFER or MW_EXPORT_STREAM
  56          */
  57         function WikiExporter( &$db, $history = MW_EXPORT_CURRENT,
  58                         $buffer = MW_EXPORT_BUFFER, $text = MW_EXPORT_TEXT ) {
  59                 $this->db =& $db;
  60                 $this->history = $history;
  61                 $this->buffer  = $buffer;
  62                 $this->writer  = new XmlDumpWriter();
  63                 $this->sink    = new DumpOutput();
  64                 $this->text    = $text;
  65         }
  66
  67         /**
  68          * Set the DumpOutput or DumpFilter object which will receive
  69          * various row objects and XML output for filtering. Filters
  70          * can be chained or used as callbacks.
  71          *
  72          * @param mixed $callback
  73          */
  74         function setOutputSink( &$sink ) {
  75                 $this->sink =& $sink;
  76         }
  77
  78         function openStream() {
  79                 $output = $this->writer->openStream();
  80                 $this->sink->writeOpenStream( $output );
  81         }
  82
  83         function closeStream() {
  84                 $output = $this->writer->closeStream();
  85                 $this->sink->writeCloseStream( $output );
  86         }
  87
  88         /**
  89          * Dumps a series of page and revision records for all pages
  90          * in the database, either including complete history or only
  91          * the most recent version.
  92          */
  93         function allPages() {
  94                 return $this->dumpFrom( '' );
  95         }
  96
  97         /**
  98          * Dumps a series of page and revision records for those pages
  99          * in the database falling within the page_id range given.
 100          * @param int $start Inclusive lower limit (this id is included)
 101          * @param int $end   Exclusive upper limit (this id is not included)
 102          *                   If 0, no upper limit.
 103          */
 104         function pagesByRange( $start, $end ) {
 105                 $condition = 'page_id >= ' . intval( $start );
 106                 if( $end ) {
 107                         $condition .= ' AND page_id < ' . intval( $end );
 108                 }
 109                 return $this->dumpFrom( $condition );
 110         }
 111
 112         /**
 113          * @param Title $title
 114          */
 115         function pageByTitle( $title ) {
 116                 return $this->dumpFrom(
 117                         'page_namespace=' . $title->getNamespace() .
 118                         ' AND page_title=' . $this->db->addQuotes( $title->getDbKey() ) );
 119         }
 120
 121         function pageByName( $name ) {
 122                 $title = Title::newFromText( $name );
 123                 if( is_null( $title ) ) {
 124                         return new WikiError( "Can't export invalid title" );
 125                 } else {
 126                         return $this->pageByTitle( $title );
 127                 }
 128         }
 129
 130         function pagesByName( $names ) {
 131                 foreach( $names as $name ) {
 132                         $this->pageByName( $name );
 133                 }
 134         }
 135
 136
 137         // -------------------- private implementation below --------------------
 138
 139         # Generates the distinct list of authors of an article
 140         # Not called by default (depends on $this->list_authors)
 141         # Can be set by Special:Export when not exporting whole history
 142         function do_list_authors ( $page , $revision , $cond ) {
 143                 $fname = "do_list_authors" ;
 144                 wfProfileIn( $fname );
 145                 $this->author_list = "<contributors>";
 146                 $sql = "SELECT DISTINCT rev_user_text,rev_user FROM {$page},{$revision} WHERE page_id=rev_page AND " . $cond ;
 147                 $result = $this->db->query( $sql, $fname );
 148                 $resultset = $this->db->resultObject( $result );
 149                 while( $row = $resultset->fetchObject() ) {
 150                         $this->author_list .= "<contributor>" .
 151                                 "<username>" .
 152                                 htmlentities( $row->rev_user_text )  .
 153                                 "</username>" .
 154                                 "<id>" .
 155                                 $row->rev_user .
 156                                 "</id>" .
 157                                 "</contributor>";
 158                 }
 159                 wfProfileOut( $fname );
 160                 $this->author_list .= "</contributors>";
 161         }
 162
 163         function dumpFrom( $cond = '' ) {
 164                 $fname = 'WikiExporter::dumpFrom';
 165                 wfProfileIn( $fname );
 166
 167                 $page     = $this->db->tableName( 'page' );
 168                 $revision = $this->db->tableName( 'revision' );
 169                 $text     = $this->db->tableName( 'text' );
 170
 171                 if( $this->history == MW_EXPORT_FULL ) {
 172                         $join = 'page_id=rev_page';
 173                 } elseif( $this->history == MW_EXPORT_CURRENT ) {
 174                         if ( $this->list_authors && $cond != '' )  { // List authors, if so desired
 175                                 $this->do_list_authors ( $page , $revision , $cond );
 176                         }
 177                         $join = 'page_id=rev_page AND page_latest=rev_id';
 178                 } else {
 179                         wfProfileOut( $fname );
 180                         return new WikiError( "$fname given invalid history dump type." );
 181                 }
 182                 $where = ( $cond == '' ) ? '' : "$cond AND";
 183
 184                 if( $this->buffer == MW_EXPORT_STREAM ) {
 185                         $prev = $this->db->bufferResults( false );
 186                 }
 187                 if( $cond == '' ) {
 188                         // Optimization hack for full-database dump
 189                         $revindex = $pageindex = $this->db->useIndexClause("PRIMARY");
 190                         $straight = ' /*! STRAIGHT_JOIN */ ';
 191                 } else {
 192                         $pageindex = '';
 193                         $revindex = '';
 194                         $straight = '';
 195                 }
 196                 if( $this->text == MW_EXPORT_STUB ) {
 197                         $sql = "SELECT $straight * FROM
 198                                         $page $pageindex,
 199                                         $revision $revindex
 200                                         WHERE $where $join
 201                                         ORDER BY page_id";
 202                 } else {
 203                         $sql = "SELECT $straight * FROM
 204                                         $page $pageindex,
 205                                         $revision $revindex,
 206                                         $text
 207                                         WHERE $where $join AND rev_text_id=old_id
 208                                         ORDER BY page_id";
 209                 }
 210                 $result = $this->db->query( $sql, $fname );
 211                 $wrapper = $this->db->resultObject( $result );
 212                 $this->outputStream( $wrapper );
 213
 214                 if ( $this->list_authors ) {
 215                         $this->outputStream( $wrapper );
 216                 }
 217
 218                 if( $this->buffer == MW_EXPORT_STREAM ) {
 219                         $this->db->bufferResults( $prev );
 220                 }
 221
 222                 wfProfileOut( $fname );
 223         }
 224
 225         /**
 226          * Runs through a query result set dumping page and revision records.
 227          * The result set should be sorted/grouped by page to avoid duplicate
 228          * page records in the output.
 229          *
 230          * The result set will be freed once complete. Should be safe for
 231          * streaming (non-buffered) queries, as long as it was made on a
 232          * separate database connection not managed by LoadBalancer; some
 233          * blob storage types will make queries to pull source data.
 234          *
 235          * @param ResultWrapper $resultset
 236          * @access private
 237          */
 238         function outputStream( $resultset ) {
 239                 $last = null;
 240                 while( $row = $resultset->fetchObject() ) {
 241                         if( is_null( $last ) ||
 242                                 $last->page_namespace != $row->page_namespace ||
 243                                 $last->page_title     != $row->page_title ) {
 244                                 if( isset( $last ) ) {
 245                                         $output = $this->writer->closePage();
 246                                         $this->sink->writeClosePage( $output );
 247                                 }
 248                                 $output = $this->writer->openPage( $row );
 249                                 $this->sink->writeOpenPage( $row, $output );
 250                                 $last = $row;
 251                         }
 252                         $output = $this->writer->writeRevision( $row );
 253                         $this->sink->writeRevision( $row, $output );
 254                 }
 255                 if( isset( $last ) ) {
 256                         $output = $this->author_list . $this->writer->closePage();
 257                         $this->sink->writeClosePage( $output );
 258                 }
 259                 $resultset->free();
 260         }
 261 }
 262
 263 class XmlDumpWriter {
 264
 265         /**
 266          * Returns the export schema version.
 267          * @return string
 268          */
 269         function schemaVersion() {
 270                 return "0.3"; // FIXME: upgrade to 0.4 when updated XSD is ready, for the revision deletion bits
 271         }
 272
 273         /**
 274          * Opens the XML output stream's root <mediawiki> element.
 275          * This does not include an xml directive, so is safe to include
 276          * as a subelement in a larger XML stream. Namespace and XML Schema
 277          * references are included.
 278          *
 279          * Output will be encoded in UTF-8.
 280          *
 281          * @return string
 282          */
 283         function openStream() {
 284                 global $wgContLanguageCode;
 285                 $ver = $this->schemaVersion();
 286                 return wfElement( 'mediawiki', array(
 287                         'xmlns'              => "http://www.mediawiki.org/xml/export-$ver/",
 288                         'xmlns:xsi'          => "http://www.w3.org/2001/XMLSchema-instance",
 289                         'xsi:schemaLocation' => "http://www.mediawiki.org/xml/export-$ver/ " .
 290                                                 "http://www.mediawiki.org/xml/export-$ver.xsd",
 291                         'version'            => $ver,
 292                         'xml:lang'           => $wgContLanguageCode ),
 293                         null ) .
 294                         "\n" .
 295                         $this->siteInfo();
 296         }
 297
 298         function siteInfo() {
 299                 $info = array(
 300                         $this->sitename(),
 301                         $this->homelink(),
 302                         $this->generator(),
 303                         $this->caseSetting(),
 304                         $this->namespaces() );
 305                 return "  <siteinfo>\n    " .
 306                         implode( "\n    ", $info ) .
 307                         "\n  </siteinfo>\n";
 308         }
 309
 310         function sitename() {
 311                 global $wgSitename;
 312                 return wfElement( 'sitename', array(), $wgSitename );
 313         }
 314
 315         function generator() {
 316                 global $wgVersion;
 317                 return wfElement( 'generator', array(), "MediaWiki $wgVersion" );
 318         }
 319
 320         function homelink() {
 321                 $page = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 322                 return wfElement( 'base', array(), $page->getFullUrl() );
 323         }
 324
 325         function caseSetting() {
 326                 global $wgCapitalLinks;
 327                 // "case-insensitive" option is reserved for future
 328                 $sensitivity = $wgCapitalLinks ? 'first-letter' : 'case-sensitive';
 329                 return wfElement( 'case', array(), $sensitivity );
 330         }
 331
 332         function namespaces() {
 333                 global $wgContLang;
 334                 $spaces = "  <namespaces>\n";
 335                 foreach( $wgContLang->getFormattedNamespaces() as $ns => $title ) {
 336                         $spaces .= '      ' . wfElement( 'namespace', array( 'key' => $ns ), $title ) . "\n";
 337                 }
 338                 $spaces .= "    </namespaces>";
 339                 return $spaces;
 340         }
 341
 342         /**
 343          * Closes the output stream with the closing root element.
 344          * Call when finished dumping things.
 345          */
 346         function closeStream() {
 347                 return "</mediawiki>\n";
 348         }
 349
 350
 351         /**
 352          * Opens a <page> section on the output stream, with data
 353          * from the given database row.
 354          *
 355          * @param object $row
 356          * @return string
 357          * @access private
 358          */
 359         function openPage( $row ) {
 360                 $out = "  <page>\n";
 361                 $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 362                 $out .= '    ' . wfElementClean( 'title', array(), $title->getPrefixedText() ) . "\n";
 363                 $out .= '    ' . wfElement( 'id', array(), strval( $row->page_id ) ) . "\n";
 364                 if( '' != $row->page_restrictions ) {
 365                         $out .= '    ' . wfElement( 'restrictions', array(),
 366                                 strval( $row->page_restrictions ) ) . "\n";
 367                 }
 368                 return $out;
 369         }
 370
 371         /**
 372          * Closes a <page> section on the output stream.
 373          *
 374          * @access private
 375          */
 376         function closePage() {
 377                 return "  </page>\n";
 378         }
 379
 380         /**
 381          * Dumps a <revision> section on the output stream, with
 382          * data filled in from the given database row.
 383          *
 384          * @param object $row
 385          * @return string
 386          * @access private
 387          */
 388         function writeRevision( $row ) {
 389                 $fname = 'WikiExporter::dumpRev';
 390                 wfProfileIn( $fname );
 391
 392                 $out  = "    <revision>\n";
 393                 $out .= "      " . wfElement( 'id', null, strval( $row->rev_id ) ) . "\n";
 394
 395                 $ts = wfTimestamp( TS_ISO_8601, $row->rev_timestamp );
 396                 $out .= "      " . wfElement( 'timestamp', null, $ts ) . "\n";
 397
 398                 if( $row->rev_deleted & Revision::MW_REV_DELETED_USER ) {
 399                         $out .= "      " . wfElement( 'contributor', array( 'deleted' => 'deleted' ) ) . "\n";
 400                 } else {
 401                         $out .= "      <contributor>\n";
 402                         if( $row->rev_user ) {
 403                                 $out .= "        " . wfElementClean( 'username', null, strval( $row->rev_user_text ) ) . "\n";
 404                                 $out .= "        " . wfElement( 'id', null, strval( $row->rev_user ) ) . "\n";
 405                         } else {
 406                                 $out .= "        " . wfElementClean( 'ip', null, strval( $row->rev_user_text ) ) . "\n";
 407                         }
 408                         $out .= "      </contributor>\n";
 409                 }
 410
 411                 if( $row->rev_minor_edit ) {
 412                         $out .=  "      <minor/>\n";
 413                 }
 414                 if( $row->rev_deleted & Revision::MW_REV_DELETED_COMMENT ) {
 415                         $out .= "      " . wfElement( 'comment', array( 'deleted' => 'deleted' ) ) . "\n";
 416                 } elseif( $row->rev_comment != '' ) {
 417                         $out .= "      " . wfElementClean( 'comment', null, strval( $row->rev_comment ) ) . "\n";
 418                 }
 419
 420                 if( $row->rev_deleted & Revision::MW_REV_DELETED_TEXT ) {
 421                         $out .= "      " . wfElement( 'text', array( 'deleted' => 'deleted' ) ) . "\n";
 422                 } elseif( isset( $row->old_text ) ) {
 423                         // Raw text from the database may have invalid chars
 424                         $text = strval( Revision::getRevisionText( $row ) );
 425                         $out .= "      " . wfElementClean( 'text',
 426                                 array( 'xml:space' => 'preserve' ),
 427                                 strval( $text ) ) . "\n";
 428                 } else {
 429                         // Stub output
 430                         $out .= "      " . wfElement( 'text',
 431                                 array( 'id' => $row->rev_text_id ),
 432                                 "" ) . "\n";
 433                 }
 434
 435                 $out .= "    </revision>\n";
 436
 437                 wfProfileOut( $fname );
 438                 return $out;
 439         }
 440
 441 }
 442
 443
 444 /**
 445  * Base class for output stream; prints to stdout or buffer or whereever.
 446  */
 447 class DumpOutput {
 448         function writeOpenStream( $string ) {
 449                 $this->write( $string );
 450         }
 451
 452         function writeCloseStream( $string ) {
 453                 $this->write( $string );
 454         }
 455
 456         function writeOpenPage( $page, $string ) {
 457                 $this->write( $string );
 458         }
 459
 460         function writeClosePage( $string ) {
 461                 $this->write( $string );
 462         }
 463
 464         function writeRevision( $rev, $string ) {
 465                 $this->write( $string );
 466         }
 467
 468         /**
 469          * Override to write to a different stream type.
 470          * @return bool
 471          */
 472         function write( $string ) {
 473                 print $string;
 474         }
 475 }
 476
 477 /**
 478  * Stream outputter to send data to a file.
 479  */
 480 class DumpFileOutput extends DumpOutput {
 481         var $handle;
 482
 483         function DumpFileOutput( $file ) {
 484                 $this->handle = fopen( $file, "wt" );
 485         }
 486
 487         function write( $string ) {
 488                 fputs( $this->handle, $string );
 489         }
 490 }
 491
 492 /**
 493  * Stream outputter to send data to a file via some filter program.
 494  * Even if compression is available in a library, using a separate
 495  * program can allow us to make use of a multi-processor system.
 496  */
 497 class DumpPipeOutput extends DumpFileOutput {
 498         function DumpPipeOutput( $command, $file = null ) {
 499                 if( !is_null( $file ) ) {
 500                         $command .=  " > " . wfEscapeShellArg( $file );
 501                 }
 502                 $this->handle = popen( $command, "w" );
 503         }
 504 }
 505
 506 /**
 507  * Sends dump output via the gzip compressor.
 508  */
 509 class DumpGZipOutput extends DumpPipeOutput {
 510         function DumpGZipOutput( $file ) {
 511                 parent::DumpPipeOutput( "gzip", $file );
 512         }
 513 }
 514
 515 /**
 516  * Sends dump output via the bgzip2 compressor.
 517  */
 518 class DumpBZip2Output extends DumpPipeOutput {
 519         function DumpBZip2Output( $file ) {
 520                 parent::DumpPipeOutput( "bzip2", $file );
 521         }
 522 }
 523
 524 /**
 525  * Sends dump output via the p7zip compressor.
 526  */
 527 class Dump7ZipOutput extends DumpPipeOutput {
 528         function Dump7ZipOutput( $file ) {
 529                 $command = "7za a -bd -si " . wfEscapeShellArg( $file );
 530                 // Suppress annoying useless crap from p7zip
 531                 // Unfortunately this could suppress real error messages too
 532                 $command .= " >/dev/null 2>&1";
 533                 parent::DumpPipeOutput( $command );
 534         }
 535 }
 536
 537
 538
 539 /**
 540  * Dump output filter class.
 541  * This just does output filtering and streaming; XML formatting is done
 542  * higher up, so be careful in what you do.
 543  */
 544 class DumpFilter {
 545         function DumpFilter( &$sink ) {
 546                 $this->sink =& $sink;
 547         }
 548
 549         function writeOpenStream( $string ) {
 550                 $this->sink->writeOpenStream( $string );
 551         }
 552
 553         function writeCloseStream( $string ) {
 554                 $this->sink->writeCloseStream( $string );
 555         }
 556
 557         function writeOpenPage( $page, $string ) {
 558                 $this->sendingThisPage = $this->pass( $page, $string );
 559                 if( $this->sendingThisPage ) {
 560                         $this->sink->writeOpenPage( $page, $string );
 561                 }
 562         }
 563
 564         function writeClosePage( $string ) {
 565                 if( $this->sendingThisPage ) {
 566                         $this->sink->writeClosePage( $string );
 567                         $this->sendingThisPage = false;
 568                 }
 569         }
 570
 571         function writeRevision( $rev, $string ) {
 572                 if( $this->sendingThisPage ) {
 573                         $this->sink->writeRevision( $rev, $string );
 574                 }
 575         }
 576
 577         /**
 578          * Override for page-based filter types.
 579          * @return bool
 580          */
 581         function pass( $page, $string ) {
 582                 return true;
 583         }
 584 }
 585
 586 /**
 587  * Simple dump output filter to exclude all talk pages.
 588  */
 589 class DumpNotalkFilter extends DumpFilter {
 590         function pass( $page ) {
 591                 return !Namespace::isTalk( $page->page_namespace );
 592         }
 593 }
 594
 595 /**
 596  * Dump output filter to include or exclude pages in a given set of namespaces.
 597  */
 598 class DumpNamespaceFilter extends DumpFilter {
 599         var $invert = false;
 600         var $namespaces = array();
 601
 602         function DumpNamespaceFilter( &$sink, $param ) {
 603                 parent::DumpFilter( $sink );
 604
 605                 $constants = array(
 606                         "NS_MAIN"           => NS_MAIN,
 607                         "NS_TALK"           => NS_TALK,
 608                         "NS_USER"           => NS_USER,
 609                         "NS_USER_TALK"      => NS_USER_TALK,
 610                         "NS_PROJECT"        => NS_PROJECT,
 611                         "NS_PROJECT_TALK"   => NS_PROJECT_TALK,
 612                         "NS_IMAGE"          => NS_IMAGE,
 613                         "NS_IMAGE_TALK"     => NS_IMAGE_TALK,
 614                         "NS_MEDIAWIKI"      => NS_MEDIAWIKI,
 615                         "NS_MEDIAWIKI_TALK" => NS_MEDIAWIKI_TALK,
 616                         "NS_TEMPLATE"       => NS_TEMPLATE,
 617                         "NS_TEMPLATE_TALK"  => NS_TEMPLATE_TALK,
 618                         "NS_HELP"           => NS_HELP,
 619                         "NS_HELP_TALK"      => NS_HELP_TALK,
 620                         "NS_CATEGORY"       => NS_CATEGORY,
 621                         "NS_CATEGORY_TALK"  => NS_CATEGORY_TALK );
 622
 623                 if( $param{0} == '!' ) {
 624                         $this->invert = true;
 625                         $param = substr( $param, 1 );
 626                 }
 627
 628                 foreach( explode( ',', $param ) as $key ) {
 629                         $key = trim( $key );
 630                         if( isset( $constants[$key] ) ) {
 631                                 $ns = $constants[$key];
 632                                 $this->namespaces[$ns] = true;
 633                         } elseif( is_numeric( $key ) ) {
 634                                 $ns = intval( $key );
 635                                 $this->namespaces[$ns] = true;
 636                         } else {
 637                                 wfDie( "Unrecognized namespace key '$key'\n" );
 638                         }
 639                 }
 640         }
 641
 642         function pass( $page ) {
 643                 $match = isset( $this->namespaces[$page->page_namespace] );
 644                 return $this->invert xor $match;
 645         }
 646 }
 647
 648
 649 /**
 650  * Dump output filter to include only the last revision in each page sequence.
 651  */
 652 class DumpLatestFilter extends DumpFilter {
 653         var $page, $pageString, $rev, $revString;
 654
 655         function writeOpenPage( $page, $string ) {
 656                 $this->page = $page;
 657                 $this->pageString = $string;
 658         }
 659
 660         function writeClosePage( $string ) {
 661                 if( $this->rev ) {
 662                         $this->sink->writeOpenPage( $this->page, $this->pageString );
 663                         $this->sink->writeRevision( $this->rev, $this->revString );
 664                         $this->sink->writeClosePage( $string );
 665                 }
 666                 $this->rev = null;
 667                 $this->revString = null;
 668                 $this->page = null;
 669                 $this->pageString = null;
 670         }
 671
 672         function writeRevision( $rev, $string ) {
 673                 if( $rev->rev_id == $this->page->page_latest ) {
 674                         $this->rev = $rev;
 675                         $this->revString = $string;
 676                 }
 677         }
 678 }
 679
 680 /**
 681  * Base class for output stream; prints to stdout or buffer or whereever.
 682  */
 683 class DumpMultiWriter {
 684         function DumpMultiWriter( $sinks ) {
 685                 $this->sinks = $sinks;
 686                 $this->count = count( $sinks );
 687         }
 688
 689         function writeOpenStream( $string ) {
 690                 for( $i = 0; $i < $this->count; $i++ ) {
 691                         $this->sinks[$i]->writeOpenStream( $string );
 692                 }
 693         }
 694
 695         function writeCloseStream( $string ) {
 696                 for( $i = 0; $i < $this->count; $i++ ) {
 697                         $this->sinks[$i]->writeCloseStream( $string );
 698                 }
 699         }
 700
 701         function writeOpenPage( $page, $string ) {
 702                 for( $i = 0; $i < $this->count; $i++ ) {
 703                         $this->sinks[$i]->writeOpenPage( $page, $string );
 704                 }
 705         }
 706
 707         function writeClosePage( $string ) {
 708                 for( $i = 0; $i < $this->count; $i++ ) {
 709                         $this->sinks[$i]->writeClosePage( $string );
 710                 }
 711         }
 712
 713         function writeRevision( $rev, $string ) {
 714                 for( $i = 0; $i < $this->count; $i++ ) {
 715                         $this->sinks[$i]->writeRevision( $rev, $string );
 716                 }
 717         }
 718 }
 719
 720 function xmlsafe( $string ) {
 721         $fname = 'xmlsafe';
 722         wfProfileIn( $fname );
 723
 724         /**
 725          * The page may contain old data which has not been properly normalized.
 726          * Invalid UTF-8 sequences or forbidden control characters will make our
 727          * XML output invalid, so be sure to strip them out.
 728          */
 729         $string = UtfNormal::cleanUp( $string );
 730
 731         $string = htmlspecialchars( $string );
 732         wfProfileOut( $fname );
 733         return $string;
 734 }
 735
 736 ?>