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 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                         $revindex = $pageindex = $this->db->useIndexClause("PRIMARY");
 191                         $straight = ' /*! STRAIGHT_JOIN */ ';
 192                 } else {
 193                         $pageindex = '';
 194                         $revindex = '';
 195                         $straight = '';
 196                 }
 197                 if( $this->text == MW_EXPORT_STUB ) {
 198                         $sql = "SELECT $straight * FROM
 199                                         $page $pageindex,
 200                                         $revision $revindex
 201                                         WHERE $where $join
 202                                         ORDER BY page_id";
 203                 } else {
 204                         $sql = "SELECT $straight * FROM
 205                                         $page $pageindex,
 206                                         $revision $revindex,
 207                                         $text
 208                                         WHERE $where $join AND rev_text_id=old_id
 209                                         ORDER BY page_id";
 210                 }
 211                 $result = $this->db->query( $sql, $fname );
 212                 $wrapper = $this->db->resultObject( $result );
 213                 $this->outputStream( $wrapper );
 214
 215                 if ( $this->list_authors ) {
 216                         $this->outputStream( $wrapper );
 217                 }
 218
 219                 if( $this->buffer == MW_EXPORT_STREAM ) {
 220                         $this->db->bufferResults( $prev );
 221                 }
 222
 223                 wfProfileOut( $fname );
 224         }
 225
 226         /**
 227          * Runs through a query result set dumping page and revision records.
 228          * The result set should be sorted/grouped by page to avoid duplicate
 229          * page records in the output.
 230          *
 231          * The result set will be freed once complete. Should be safe for
 232          * streaming (non-buffered) queries, as long as it was made on a
 233          * separate database connection not managed by LoadBalancer; some
 234          * blob storage types will make queries to pull source data.
 235          *
 236          * @param ResultWrapper $resultset
 237          * @access private
 238          */
 239         function outputStream( $resultset ) {
 240                 $last = null;
 241                 while( $row = $resultset->fetchObject() ) {
 242                         if( is_null( $last ) ||
 243                                 $last->page_namespace != $row->page_namespace ||
 244                                 $last->page_title     != $row->page_title ) {
 245                                 if( isset( $last ) ) {
 246                                         $output = $this->writer->closePage();
 247                                         $this->sink->writeClosePage( $output );
 248                                 }
 249                                 $output = $this->writer->openPage( $row );
 250                                 $this->sink->writeOpenPage( $row, $output );
 251                                 $last = $row;
 252                         }
 253                         $output = $this->writer->writeRevision( $row );
 254                         $this->sink->writeRevision( $row, $output );
 255                 }
 256                 if( isset( $last ) ) {
 257                         $output = $this->author_list . $this->writer->closePage();
 258                         $this->sink->writeClosePage( $output );
 259                 }
 260                 $resultset->free();
 261         }
 262 }
 263
 264 class XmlDumpWriter {
 265
 266         /**
 267          * Returns the export schema version.
 268          * @return string
 269          */
 270         function schemaVersion() {
 271                 return "0.3"; // FIXME: upgrade to 0.4 when updated XSD is ready, for the revision deletion bits
 272         }
 273
 274         /**
 275          * Opens the XML output stream's root <mediawiki> element.
 276          * This does not include an xml directive, so is safe to include
 277          * as a subelement in a larger XML stream. Namespace and XML Schema
 278          * references are included.
 279          *
 280          * Output will be encoded in UTF-8.
 281          *
 282          * @return string
 283          */
 284         function openStream() {
 285                 global $wgContLanguageCode;
 286                 $ver = $this->schemaVersion();
 287                 return wfElement( 'mediawiki', array(
 288                         'xmlns'              => "http://www.mediawiki.org/xml/export-$ver/",
 289                         'xmlns:xsi'          => "http://www.w3.org/2001/XMLSchema-instance",
 290                         'xsi:schemaLocation' => "http://www.mediawiki.org/xml/export-$ver/ " .
 291                                                 "http://www.mediawiki.org/xml/export-$ver.xsd",
 292                         'version'            => $ver,
 293                         'xml:lang'           => $wgContLanguageCode ),
 294                         null ) .
 295                         "\n" .
 296                         $this->siteInfo();
 297         }
 298
 299         function siteInfo() {
 300                 $info = array(
 301                         $this->sitename(),
 302                         $this->homelink(),
 303                         $this->generator(),
 304                         $this->caseSetting(),
 305                         $this->namespaces() );
 306                 return "  <siteinfo>\n    " .
 307                         implode( "\n    ", $info ) .
 308                         "\n  </siteinfo>\n";
 309         }
 310
 311         function sitename() {
 312                 global $wgSitename;
 313                 return wfElement( 'sitename', array(), $wgSitename );
 314         }
 315
 316         function generator() {
 317                 global $wgVersion;
 318                 return wfElement( 'generator', array(), "MediaWiki $wgVersion" );
 319         }
 320
 321         function homelink() {
 322                 $page = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 323                 return wfElement( 'base', array(), $page->getFullUrl() );
 324         }
 325
 326         function caseSetting() {
 327                 global $wgCapitalLinks;
 328                 // "case-insensitive" option is reserved for future
 329                 $sensitivity = $wgCapitalLinks ? 'first-letter' : 'case-sensitive';
 330                 return wfElement( 'case', array(), $sensitivity );
 331         }
 332
 333         function namespaces() {
 334                 global $wgContLang;
 335                 $spaces = "  <namespaces>\n";
 336                 foreach( $wgContLang->getFormattedNamespaces() as $ns => $title ) {
 337                         $spaces .= '      ' . wfElement( 'namespace', array( 'key' => $ns ), $title ) . "\n";
 338                 }
 339                 $spaces .= "    </namespaces>";
 340                 return $spaces;
 341         }
 342
 343         /**
 344          * Closes the output stream with the closing root element.
 345          * Call when finished dumping things.
 346          */
 347         function closeStream() {
 348                 return "</mediawiki>\n";
 349         }
 350
 351
 352         /**
 353          * Opens a <page> section on the output stream, with data
 354          * from the given database row.
 355          *
 356          * @param object $row
 357          * @return string
 358          * @access private
 359          */
 360         function openPage( $row ) {
 361                 $out = "  <page>\n";
 362                 $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 363                 $out .= '    ' . wfElementClean( 'title', array(), $title->getPrefixedText() ) . "\n";
 364                 $out .= '    ' . wfElement( 'id', array(), strval( $row->page_id ) ) . "\n";
 365                 if( '' != $row->page_restrictions ) {
 366                         $out .= '    ' . wfElement( 'restrictions', array(),
 367                                 strval( $row->page_restrictions ) ) . "\n";
 368                 }
 369                 return $out;
 370         }
 371
 372         /**
 373          * Closes a <page> section on the output stream.
 374          *
 375          * @access private
 376          */
 377         function closePage() {
 378                 return "  </page>\n";
 379         }
 380
 381         /**
 382          * Dumps a <revision> section on the output stream, with
 383          * data filled in from the given database row.
 384          *
 385          * @param object $row
 386          * @return string
 387          * @access private
 388          */
 389         function writeRevision( $row ) {
 390                 $fname = 'WikiExporter::dumpRev';
 391                 wfProfileIn( $fname );
 392
 393                 $out  = "    <revision>\n";
 394                 $out .= "      " . wfElement( 'id', null, strval( $row->rev_id ) ) . "\n";
 395
 396                 $ts = wfTimestamp( TS_ISO_8601, $row->rev_timestamp );
 397                 $out .= "      " . wfElement( 'timestamp', null, $ts ) . "\n";
 398
 399                 if( $row->rev_deleted & MW_REV_DELETED_USER ) {
 400                         $out .= "      " . wfElement( 'contributor', array( 'deleted' => 'deleted' ) ) . "\n";
 401                 } else {
 402                         $out .= "      <contributor>\n";
 403                         if( $row->rev_user ) {
 404                                 $out .= "        " . wfElementClean( 'username', null, strval( $row->rev_user_text ) ) . "\n";
 405                                 $out .= "        " . wfElement( 'id', null, strval( $row->rev_user ) ) . "\n";
 406                         } else {
 407                                 $out .= "        " . wfElementClean( 'ip', null, strval( $row->rev_user_text ) ) . "\n";
 408                         }
 409                         $out .= "      </contributor>\n";
 410                 }
 411
 412                 if( $row->rev_minor_edit ) {
 413                         $out .=  "      <minor/>\n";
 414                 }
 415                 if( $row->rev_deleted & MW_REV_DELETED_COMMENT ) {
 416                         $out .= "      " . wfElement( 'comment', array( 'deleted' => 'deleted' ) ) . "\n";
 417                 } elseif( $row->rev_comment != '' ) {
 418                         $out .= "      " . wfElementClean( 'comment', null, strval( $row->rev_comment ) ) . "\n";
 419                 }
 420
 421                 if( $row->rev_deleted & MW_REV_DELETED_TEXT ) {
 422                         $out .= "      " . wfElement( 'text', array( 'deleted' => 'deleted' ) ) . "\n";
 423                 } elseif( isset( $row->old_text ) ) {
 424                         // Raw text from the database may have invalid chars
 425                         $text = strval( Revision::getRevisionText( $row ) );
 426                         $out .= "      " . wfElementClean( 'text',
 427                                 array( 'xml:space' => 'preserve' ),
 428                                 strval( $text ) ) . "\n";
 429                 } else {
 430                         // Stub output
 431                         $out .= "      " . wfElement( 'text',
 432                                 array( 'id' => $row->rev_text_id ),
 433                                 "" ) . "\n";
 434                 }
 435
 436                 $out .= "    </revision>\n";
 437
 438                 wfProfileOut( $fname );
 439                 return $out;
 440         }
 441
 442 }
 443
 444
 445 /**
 446  * Base class for output stream; prints to stdout or buffer or whereever.
 447  */
 448 class DumpOutput {
 449         function writeOpenStream( $string ) {
 450                 $this->write( $string );
 451         }
 452
 453         function writeCloseStream( $string ) {
 454                 $this->write( $string );
 455         }
 456
 457         function writeOpenPage( $page, $string ) {
 458                 $this->write( $string );
 459         }
 460
 461         function writeClosePage( $string ) {
 462                 $this->write( $string );
 463         }
 464
 465         function writeRevision( $rev, $string ) {
 466                 $this->write( $string );
 467         }
 468
 469         /**
 470          * Override to write to a different stream type.
 471          * @return bool
 472          */
 473         function write( $string ) {
 474                 print $string;
 475         }
 476 }
 477
 478 /**
 479  * Stream outputter to send data to a file.
 480  */
 481 class DumpFileOutput extends DumpOutput {
 482         var $handle;
 483
 484         function DumpFileOutput( $file ) {
 485                 $this->handle = fopen( $file, "wt" );
 486         }
 487
 488         function write( $string ) {
 489                 fputs( $this->handle, $string );
 490         }
 491 }
 492
 493 /**
 494  * Stream outputter to send data to a file via some filter program.
 495  * Even if compression is available in a library, using a separate
 496  * program can allow us to make use of a multi-processor system.
 497  */
 498 class DumpPipeOutput extends DumpFileOutput {
 499         function DumpPipeOutput( $command, $file = null ) {
 500                 if( !is_null( $file ) ) {
 501                         $command .=  " > " . wfEscapeShellArg( $file );
 502                 }
 503                 $this->handle = popen( $command, "w" );
 504         }
 505 }
 506
 507 /**
 508  * Sends dump output via the gzip compressor.
 509  */
 510 class DumpGZipOutput extends DumpPipeOutput {
 511         function DumpGZipOutput( $file ) {
 512                 parent::DumpPipeOutput( "gzip", $file );
 513         }
 514 }
 515
 516 /**
 517  * Sends dump output via the bgzip2 compressor.
 518  */
 519 class DumpBZip2Output extends DumpPipeOutput {
 520         function DumpBZip2Output( $file ) {
 521                 parent::DumpPipeOutput( "bzip2", $file );
 522         }
 523 }
 524
 525 /**
 526  * Sends dump output via the p7zip compressor.
 527  */
 528 class Dump7ZipOutput extends DumpPipeOutput {
 529         function Dump7ZipOutput( $file ) {
 530                 $command = "7za a -bd -si " . wfEscapeShellArg( $file );
 531                 // Suppress annoying useless crap from p7zip
 532                 // Unfortunately this could suppress real error messages too
 533                 $command .= " >/dev/null 2>&1";
 534                 parent::DumpPipeOutput( $command );
 535         }
 536 }
 537
 538
 539
 540 /**
 541  * Dump output filter class.
 542  * This just does output filtering and streaming; XML formatting is done
 543  * higher up, so be careful in what you do.
 544  */
 545 class DumpFilter {
 546         function DumpFilter( &$sink ) {
 547                 $this->sink =& $sink;
 548         }
 549
 550         function writeOpenStream( $string ) {
 551                 $this->sink->writeOpenStream( $string );
 552         }
 553
 554         function writeCloseStream( $string ) {
 555                 $this->sink->writeCloseStream( $string );
 556         }
 557
 558         function writeOpenPage( $page, $string ) {
 559                 $this->sendingThisPage = $this->pass( $page, $string );
 560                 if( $this->sendingThisPage ) {
 561                         $this->sink->writeOpenPage( $page, $string );
 562                 }
 563         }
 564
 565         function writeClosePage( $string ) {
 566                 if( $this->sendingThisPage ) {
 567                         $this->sink->writeClosePage( $string );
 568                         $this->sendingThisPage = false;
 569                 }
 570         }
 571
 572         function writeRevision( $rev, $string ) {
 573                 if( $this->sendingThisPage ) {
 574                         $this->sink->writeRevision( $rev, $string );
 575                 }
 576         }
 577
 578         /**
 579          * Override for page-based filter types.
 580          * @return bool
 581          */
 582         function pass( $page, $string ) {
 583                 return true;
 584         }
 585 }
 586
 587 /**
 588  * Simple dump output filter to exclude all talk pages.
 589  */
 590 class DumpNotalkFilter extends DumpFilter {
 591         function pass( $page ) {
 592                 return !Namespace::isTalk( $page->page_namespace );
 593         }
 594 }
 595
 596 /**
 597  * Dump output filter to include or exclude pages in a given set of namespaces.
 598  */
 599 class DumpNamespaceFilter extends DumpFilter {
 600         var $invert = false;
 601         var $namespaces = array();
 602
 603         function DumpNamespaceFilter( &$sink, $param ) {
 604                 parent::DumpFilter( $sink );
 605
 606                 $constants = array(
 607                         "NS_MAIN"           => NS_MAIN,
 608                         "NS_TALK"           => NS_TALK,
 609                         "NS_USER"           => NS_USER,
 610                         "NS_USER_TALK"      => NS_USER_TALK,
 611                         "NS_PROJECT"        => NS_PROJECT,
 612                         "NS_PROJECT_TALK"   => NS_PROJECT_TALK,
 613                         "NS_IMAGE"          => NS_IMAGE,
 614                         "NS_IMAGE_TALK"     => NS_IMAGE_TALK,
 615                         "NS_MEDIAWIKI"      => NS_MEDIAWIKI,
 616                         "NS_MEDIAWIKI_TALK" => NS_MEDIAWIKI_TALK,
 617                         "NS_TEMPLATE"       => NS_TEMPLATE,
 618                         "NS_TEMPLATE_TALK"  => NS_TEMPLATE_TALK,
 619                         "NS_HELP"           => NS_HELP,
 620                         "NS_HELP_TALK"      => NS_HELP_TALK,
 621                         "NS_CATEGORY"       => NS_CATEGORY,
 622                         "NS_CATEGORY_TALK"  => NS_CATEGORY_TALK );
 623
 624                 if( $param{0} == '!' ) {
 625                         $this->invert = true;
 626                         $param = substr( $param, 1 );
 627                 }
 628
 629                 foreach( explode( ',', $param ) as $key ) {
 630                         $key = trim( $key );
 631                         if( isset( $constants[$key] ) ) {
 632                                 $ns = $constants[$key];
 633                                 $this->namespaces[$ns] = true;
 634                         } elseif( is_numeric( $key ) ) {
 635                                 $ns = intval( $key );
 636                                 $this->namespaces[$ns] = true;
 637                         } else {
 638                                 wfDie( "Unrecognized namespace key '$key'\n" );
 639                         }
 640                 }
 641         }
 642
 643         function pass( $page ) {
 644                 $match = isset( $this->namespaces[$page->page_namespace] );
 645                 return $this->invert xor $match;
 646         }
 647 }
 648
 649
 650 /**
 651  * Dump output filter to include only the last revision in each page sequence.
 652  */
 653 class DumpLatestFilter extends DumpFilter {
 654         var $page, $pageString, $rev, $revString;
 655
 656         function writeOpenPage( $page, $string ) {
 657                 $this->page = $page;
 658                 $this->pageString = $string;
 659         }
 660
 661         function writeClosePage( $string ) {
 662                 if( $this->rev ) {
 663                         $this->sink->writeOpenPage( $this->page, $this->pageString );
 664                         $this->sink->writeRevision( $this->rev, $this->revString );
 665                         $this->sink->writeClosePage( $string );
 666                 }
 667                 $this->rev = null;
 668                 $this->revString = null;
 669                 $this->page = null;
 670                 $this->pageString = null;
 671         }
 672
 673         function writeRevision( $rev, $string ) {
 674                 if( $rev->rev_id == $this->page->page_latest ) {
 675                         $this->rev = $rev;
 676                         $this->revString = $string;
 677                 }
 678         }
 679 }
 680
 681 /**
 682  * Base class for output stream; prints to stdout or buffer or whereever.
 683  */
 684 class DumpMultiWriter {
 685         function DumpMultiWriter( $sinks ) {
 686                 $this->sinks = $sinks;
 687                 $this->count = count( $sinks );
 688         }
 689
 690         function writeOpenStream( $string ) {
 691                 for( $i = 0; $i < $this->count; $i++ ) {
 692                         $this->sinks[$i]->writeOpenStream( $string );
 693                 }
 694         }
 695
 696         function writeCloseStream( $string ) {
 697                 for( $i = 0; $i < $this->count; $i++ ) {
 698                         $this->sinks[$i]->writeCloseStream( $string );
 699                 }
 700         }
 701
 702         function writeOpenPage( $page, $string ) {
 703                 for( $i = 0; $i < $this->count; $i++ ) {
 704                         $this->sinks[$i]->writeOpenPage( $page, $string );
 705                 }
 706         }
 707
 708         function writeClosePage( $string ) {
 709                 for( $i = 0; $i < $this->count; $i++ ) {
 710                         $this->sinks[$i]->writeClosePage( $string );
 711                 }
 712         }
 713
 714         function writeRevision( $rev, $string ) {
 715                 for( $i = 0; $i < $this->count; $i++ ) {
 716                         $this->sinks[$i]->writeRevision( $rev, $string );
 717                 }
 718         }
 719 }
 720
 721 function xmlsafe( $string ) {
 722         $fname = 'xmlsafe';
 723         wfProfileIn( $fname );
 724
 725         /**
 726          * The page may contain old data which has not been properly normalized.
 727          * Invalid UTF-8 sequences or forbidden control characters will make our
 728          * XML output invalid, so be sure to strip them out.
 729          */
 730         $string = UtfNormal::cleanUp( $string );
 731
 732         $string = htmlspecialchars( $string );
 733         wfProfileOut( $fname );
 734         return $string;
 735 }
 736
 737 ?>