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