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(page_timestamp)';
 192                 } else {
 193                         $pageindex = '';
 194                         $revindex = '';
 195                 }
 196                 if( $this->text == MW_EXPORT_STUB ) {
 197                         $sql = "SELECT * FROM
 198                                         $page $pageindex,
 199                                         $revision $revindex
 200                                         WHERE $where $join
 201                                         ORDER BY page_id";
 202                 } else {
 203                         $sql = "SELECT * 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 & 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 & 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 & 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                 parent::DumpPipeOutput( $command );
 531         }
 532 }
 533
 534
 535
 536 /**
 537  * Dump output filter class.
 538  * This just does output filtering and streaming; XML formatting is done
 539  * higher up, so be careful in what you do.
 540  */
 541 class DumpFilter {
 542         function DumpFilter( &$sink ) {
 543                 $this->sink =& $sink;
 544         }
 545
 546         function writeOpenStream( $string ) {
 547                 $this->sink->writeOpenStream( $string );
 548         }
 549
 550         function writeCloseStream( $string ) {
 551                 $this->sink->writeCloseStream( $string );
 552         }
 553
 554         function writeOpenPage( $page, $string ) {
 555                 $this->sendingThisPage = $this->pass( $page, $string );
 556                 if( $this->sendingThisPage ) {
 557                         $this->sink->writeOpenPage( $page, $string );
 558                 }
 559         }
 560
 561         function writeClosePage( $string ) {
 562                 if( $this->sendingThisPage ) {
 563                         $this->sink->writeClosePage( $string );
 564                         $this->sendingThisPage = false;
 565                 }
 566         }
 567
 568         function writeRevision( $rev, $string ) {
 569                 if( $this->sendingThisPage ) {
 570                         $this->sink->writeRevision( $rev, $string );
 571                 }
 572         }
 573
 574         /**
 575          * Override for page-based filter types.
 576          * @return bool
 577          */
 578         function pass( $page, $string ) {
 579                 return true;
 580         }
 581 }
 582
 583 /**
 584  * Simple dump output filter to exclude all talk pages.
 585  */
 586 class DumpNotalkFilter extends DumpFilter {
 587         function pass( $page ) {
 588                 return !Namespace::isTalk( $page->page_namespace );
 589         }
 590 }
 591
 592 /**
 593  * Dump output filter to include or exclude pages in a given set of namespaces.
 594  */
 595 class DumpNamespaceFilter extends DumpFilter {
 596         var $invert = false;
 597         var $namespaces = array();
 598
 599         function DumpNamespaceFilter( &$sink, $param ) {
 600                 parent::DumpFilter( $sink );
 601
 602                 $constants = array(
 603                         "NS_MAIN"           => NS_MAIN,
 604                         "NS_TALK"           => NS_TALK,
 605                         "NS_USER"           => NS_USER,
 606                         "NS_USER_TALK"      => NS_USER_TALK,
 607                         "NS_PROJECT"        => NS_PROJECT,
 608                         "NS_PROJECT_TALK"   => NS_PROJECT_TALK,
 609                         "NS_IMAGE"          => NS_IMAGE,
 610                         "NS_IMAGE_TALK"     => NS_IMAGE_TALK,
 611                         "NS_MEDIAWIKI"      => NS_MEDIAWIKI,
 612                         "NS_MEDIAWIKI_TALK" => NS_MEDIAWIKI_TALK,
 613                         "NS_TEMPLATE"       => NS_TEMPLATE,
 614                         "NS_TEMPLATE_TALK"  => NS_TEMPLATE_TALK,
 615                         "NS_HELP"           => NS_HELP,
 616                         "NS_HELP_TALK"      => NS_HELP_TALK,
 617                         "NS_CATEGORY"       => NS_CATEGORY,
 618                         "NS_CATEGORY_TALK"  => NS_CATEGORY_TALK );
 619
 620                 if( $param{0} == '!' ) {
 621                         $this->invert = true;
 622                         $param = substr( $param, 1 );
 623                 }
 624
 625                 foreach( explode( ',', $param ) as $key ) {
 626                         $key = trim( $key );
 627                         if( isset( $constants[$key] ) ) {
 628                                 $ns = $constants[$key];
 629                                 $this->namespaces[$ns] = true;
 630                         } elseif( is_numeric( $key ) ) {
 631                                 $ns = intval( $key );
 632                                 $this->namespaces[$ns] = true;
 633                         } else {
 634                                 wfDie( "Unrecognized namespace key '$key'\n" );
 635                         }
 636                 }
 637         }
 638
 639         function pass( $page ) {
 640                 $match = isset( $this->namespaces[$page->page_namespace] );
 641                 return $this->invert xor $match;
 642         }
 643 }
 644
 645
 646 /**
 647  * Dump output filter to include only the last revision in each page sequence.
 648  */
 649 class DumpLatestFilter extends DumpFilter {
 650         var $page, $pageString, $rev, $revString;
 651
 652         function writeOpenPage( $page, $string ) {
 653                 $this->page = $page;
 654                 $this->pageString = $string;
 655         }
 656
 657         function writeClosePage( $string ) {
 658                 if( $this->rev ) {
 659                         $this->sink->writeOpenPage( $this->page, $this->pageString );
 660                         $this->sink->writeRevision( $this->rev, $this->revString );
 661                         $this->sink->writeClosePage( $string );
 662                 }
 663                 $this->rev = null;
 664                 $this->revString = null;
 665                 $this->page = null;
 666                 $this->pageString = null;
 667         }
 668
 669         function writeRevision( $rev, $string ) {
 670                 if( $rev->rev_id == $this->page->page_latest ) {
 671                         $this->rev = $rev;
 672                         $this->revString = $string;
 673                 }
 674         }
 675 }
 676
 677 /**
 678  * Base class for output stream; prints to stdout or buffer or whereever.
 679  */
 680 class DumpMultiWriter {
 681         function DumpMultiWriter( $sinks ) {
 682                 $this->sinks = $sinks;
 683                 $this->count = count( $sinks );
 684         }
 685
 686         function writeOpenStream( $string ) {
 687                 for( $i = 0; $i < $this->count; $i++ ) {
 688                         $this->sinks[$i]->writeOpenStream( $string );
 689                 }
 690         }
 691
 692         function writeCloseStream( $string ) {
 693                 for( $i = 0; $i < $this->count; $i++ ) {
 694                         $this->sinks[$i]->writeCloseStream( $string );
 695                 }
 696         }
 697
 698         function writeOpenPage( $page, $string ) {
 699                 for( $i = 0; $i < $this->count; $i++ ) {
 700                         $this->sinks[$i]->writeOpenPage( $page, $string );
 701                 }
 702         }
 703
 704         function writeClosePage( $string ) {
 705                 for( $i = 0; $i < $this->count; $i++ ) {
 706                         $this->sinks[$i]->writeClosePage( $string );
 707                 }
 708         }
 709
 710         function writeRevision( $rev, $string ) {
 711                 for( $i = 0; $i < $this->count; $i++ ) {
 712                         $this->sinks[$i]->writeRevision( $rev, $string );
 713                 }
 714         }
 715 }
 716
 717 function xmlsafe( $string ) {
 718         $fname = 'xmlsafe';
 719         wfProfileIn( $fname );
 720
 721         /**
 722          * The page may contain old data which has not been properly normalized.
 723          * Invalid UTF-8 sequences or forbidden control characters will make our
 724          * XML output invalid, so be sure to strip them out.
 725          */
 726         $string = UtfNormal::cleanUp( $string );
 727
 728         $string = htmlspecialchars( $string );
 729         wfProfileOut( $fname );
 730         return $string;
 731 }
 732
 733 ?>