summaryrefslogtreecommitdiff
path: root/includes/Export.php
blob: 7d0a824e3240354a486734741e60a08ee80b060e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
<?php
# Copyright (C) 2003, 2005, 2006 Brion Vibber <brion@pobox.com>
# http://www.mediawiki.org/
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
# http://www.gnu.org/copyleft/gpl.html

/**
 * @defgroup Dump Dump
 */

/**
 * @ingroup SpecialPage Dump
 */
class WikiExporter {
	var $list_authors = false ; # Return distinct author list (when not returning full history)
	var $author_list = "" ;

	var $dumpUploads = false;

	const FULL = 0;
	const CURRENT = 1;

	const BUFFER = 0;
	const STREAM = 1;

	const TEXT = 0;
	const STUB = 1;

	/**
	 * If using WikiExporter::STREAM to stream a large amount of data,
	 * provide a database connection which is not managed by
	 * LoadBalancer to read from: some history blob types will
	 * make additional queries to pull source data while the
	 * main query is still running.
	 *
	 * @param $db Database
	 * @param $history Mixed: one of WikiExporter::FULL or WikiExporter::CURRENT,
	 *                 or an associative array:
	 *                   offset: non-inclusive offset at which to start the query
	 *                   limit: maximum number of rows to return
	 *                   dir: "asc" or "desc" timestamp order
	 * @param $buffer Int: one of WikiExporter::BUFFER or WikiExporter::STREAM
	 */
	function __construct( &$db, $history = WikiExporter::CURRENT,
			$buffer = WikiExporter::BUFFER, $text = WikiExporter::TEXT ) {
		$this->db =& $db;
		$this->history = $history;
		$this->buffer  = $buffer;
		$this->writer  = new XmlDumpWriter();
		$this->sink    = new DumpOutput();
		$this->text    = $text;
	}

	/**
	 * Set the DumpOutput or DumpFilter object which will receive
	 * various row objects and XML output for filtering. Filters
	 * can be chained or used as callbacks.
	 *
	 * @param $sink mixed
	 */
	function setOutputSink( &$sink ) {
		$this->sink =& $sink;
	}

	function openStream() {
		$output = $this->writer->openStream();
		$this->sink->writeOpenStream( $output );
	}

	function closeStream() {
		$output = $this->writer->closeStream();
		$this->sink->writeCloseStream( $output );
	}

	/**
	 * Dumps a series of page and revision records for all pages
	 * in the database, either including complete history or only
	 * the most recent version.
	 */
	function allPages() {
		return $this->dumpFrom( '' );
	}

	/**
	 * Dumps a series of page and revision records for those pages
	 * in the database falling within the page_id range given.
	 * @param $start Int: inclusive lower limit (this id is included)
	 * @param $end   Int: Exclusive upper limit (this id is not included)
	 *                   If 0, no upper limit.
	 */
	function pagesByRange( $start, $end ) {
		$condition = 'page_id >= ' . intval( $start );
		if( $end ) {
			$condition .= ' AND page_id < ' . intval( $end );
		}
		return $this->dumpFrom( $condition );
	}

	/**
	 * @param $title Title
	 */
	function pageByTitle( $title ) {
		return $this->dumpFrom(
			'page_namespace=' . $title->getNamespace() .
			' AND page_title=' . $this->db->addQuotes( $title->getDBkey() ) );
	}

	function pageByName( $name ) {
		$title = Title::newFromText( $name );
		if( is_null( $title ) ) {
			return new WikiError( "Can't export invalid title" );
		} else {
			return $this->pageByTitle( $title );
		}
	}

	function pagesByName( $names ) {
		foreach( $names as $name ) {
			$this->pageByName( $name );
		}
	}


	// -------------------- private implementation below --------------------

	# Generates the distinct list of authors of an article
	# Not called by default (depends on $this->list_authors)
	# Can be set by Special:Export when not exporting whole history
	function do_list_authors ( $page , $revision , $cond ) {
		$fname = "do_list_authors" ;
		wfProfileIn( $fname );
		$this->author_list = "<contributors>";
		//rev_deleted
		$nothidden = '(rev_deleted & '.Revision::DELETED_USER.') = 0';

		$sql = "SELECT DISTINCT rev_user_text,rev_user FROM {$page},{$revision} WHERE page_id=rev_page AND $nothidden AND " . $cond ;
		$result = $this->db->query( $sql, $fname );
		$resultset = $this->db->resultObject( $result );
		while( $row = $resultset->fetchObject() ) {
			$this->author_list .= "<contributor>" .
				"<username>" .
				htmlentities( $row->rev_user_text )  .
				"</username>" .
				"<id>" .
				$row->rev_user .
				"</id>" .
				"</contributor>";
		}
		wfProfileOut( $fname );
		$this->author_list .= "</contributors>";
	}

	function dumpFrom( $cond = '' ) {
		$fname = 'WikiExporter::dumpFrom';
		wfProfileIn( $fname );

		$page     = $this->db->tableName( 'page' );
		$revision = $this->db->tableName( 'revision' );
		$text     = $this->db->tableName( 'text' );

		$order = 'ORDER BY page_id';
		$limit = '';

		if( $this->history == WikiExporter::FULL ) {
			$join = 'page_id=rev_page';
		} elseif( $this->history == WikiExporter::CURRENT ) {
			if ( $this->list_authors && $cond != '' )  { // List authors, if so desired
				$this->do_list_authors ( $page , $revision , $cond );
			}
			$join = 'page_id=rev_page AND page_latest=rev_id';
		} elseif ( is_array( $this->history ) ) {
			$join = 'page_id=rev_page';
			if ( $this->history['dir'] == 'asc' ) {
				$op = '>';
				$order .= ', rev_timestamp';
			} else {
				$op = '<';
				$order .= ', rev_timestamp DESC';
			}
			if ( !empty( $this->history['offset'] ) ) {
				$join .= " AND rev_timestamp $op " . $this->db->addQuotes(
					$this->db->timestamp( $this->history['offset'] ) );
			}
			if ( !empty( $this->history['limit'] ) ) {
				$limitNum = intval( $this->history['limit'] );
				if ( $limitNum > 0 ) {
					$limit = "LIMIT $limitNum";
				}
			}
		} else {
			wfProfileOut( $fname );
			return new WikiError( "$fname given invalid history dump type." );
		}
		$where = ( $cond == '' ) ? '' : "$cond AND";

		if( $this->buffer == WikiExporter::STREAM ) {
			$prev = $this->db->bufferResults( false );
		}
		if( $cond == '' ) {
			// Optimization hack for full-database dump
			$revindex = $pageindex = $this->db->useIndexClause("PRIMARY");
			$straight = ' /*! STRAIGHT_JOIN */ ';
		} else {
			$pageindex = '';
			$revindex = '';
			$straight = '';
		}
		if( $this->text == WikiExporter::STUB ) {
			$sql = "SELECT $straight * FROM
					$page $pageindex,
					$revision $revindex
					WHERE $where $join
					$order $limit";
		} else {
			$sql = "SELECT $straight * FROM
					$page $pageindex,
					$revision $revindex,
					$text
					WHERE $where $join AND rev_text_id=old_id
					$order $limit";
		}
		$result = $this->db->query( $sql, $fname );
		$wrapper = $this->db->resultObject( $result );
		$this->outputStream( $wrapper );

		if ( $this->list_authors ) {
			$this->outputStream( $wrapper );
		}

		if( $this->buffer == WikiExporter::STREAM ) {
			$this->db->bufferResults( $prev );
		}

		wfProfileOut( $fname );
	}

	/**
	 * Runs through a query result set dumping page and revision records.
	 * The result set should be sorted/grouped by page to avoid duplicate
	 * page records in the output.
	 *
	 * The result set will be freed once complete. Should be safe for
	 * streaming (non-buffered) queries, as long as it was made on a
	 * separate database connection not managed by LoadBalancer; some
	 * blob storage types will make queries to pull source data.
	 *
	 * @param $resultset ResultWrapper
	 * @access private
	 */
	function outputStream( $resultset ) {
		$last = null;
		while( $row = $resultset->fetchObject() ) {
			if( is_null( $last ) ||
				$last->page_namespace != $row->page_namespace ||
				$last->page_title     != $row->page_title ) {
				if( isset( $last ) ) {
					$output = '';
					if( $this->dumpUploads ) {
						$output .= $this->writer->writeUploads( $last );
					}
					$output .= $this->writer->closePage();
					$this->sink->writeClosePage( $output );
				}
				$output = $this->writer->openPage( $row );
				$this->sink->writeOpenPage( $row, $output );
				$last = $row;
			}
			$output = $this->writer->writeRevision( $row );
			$this->sink->writeRevision( $row, $output );
		}
		if( isset( $last ) ) {
			$output = '';
			if( $this->dumpUploads ) {
				$output .= $this->writer->writeUploads( $last );
			}
			$output .= $this->author_list;
			$output .= $this->writer->closePage();
			$this->sink->writeClosePage( $output );
		}
		$resultset->free();
	}
}

/**
 * @ingroup Dump
 */
class XmlDumpWriter {

	/**
	 * Returns the export schema version.
	 * @return string
	 */
	function schemaVersion() {
		return "0.3"; // FIXME: upgrade to 0.4 when updated XSD is ready, for the revision deletion bits
	}

	/**
	 * Opens the XML output stream's root <mediawiki> element.
	 * This does not include an xml directive, so is safe to include
	 * as a subelement in a larger XML stream. Namespace and XML Schema
	 * references are included.
	 *
	 * Output will be encoded in UTF-8.
	 *
	 * @return string
	 */
	function openStream() {
		global $wgContLanguageCode;
		$ver = $this->schemaVersion();
		return wfElement( 'mediawiki', array(
			'xmlns'              => "http://www.mediawiki.org/xml/export-$ver/",
			'xmlns:xsi'          => "http://www.w3.org/2001/XMLSchema-instance",
			'xsi:schemaLocation' => "http://www.mediawiki.org/xml/export-$ver/ " .
			                        "http://www.mediawiki.org/xml/export-$ver.xsd",
			'version'            => $ver,
			'xml:lang'           => $wgContLanguageCode ),
			null ) .
			"\n" .
			$this->siteInfo();
	}

	function siteInfo() {
		$info = array(
			$this->sitename(),
			$this->homelink(),
			$this->generator(),
			$this->caseSetting(),
			$this->namespaces() );
		return "  <siteinfo>\n    " .
			implode( "\n    ", $info ) .
			"\n  </siteinfo>\n";
	}

	function sitename() {
		global $wgSitename;
		return wfElement( 'sitename', array(), $wgSitename );
	}

	function generator() {
		global $wgVersion;
		return wfElement( 'generator', array(), "MediaWiki $wgVersion" );
	}

	function homelink() {
		return wfElement( 'base', array(), Title::newMainPage()->getFullUrl() );
	}

	function caseSetting() {
		global $wgCapitalLinks;
		// "case-insensitive" option is reserved for future
		$sensitivity = $wgCapitalLinks ? 'first-letter' : 'case-sensitive';
		return wfElement( 'case', array(), $sensitivity );
	}

	function namespaces() {
		global $wgContLang;
		$spaces = "  <namespaces>\n";
		foreach( $wgContLang->getFormattedNamespaces() as $ns => $title ) {
			$spaces .= '      ' . wfElement( 'namespace', array( 'key' => $ns ), $title ) . "\n";
		}
		$spaces .= "    </namespaces>";
		return $spaces;
	}

	/**
	 * Closes the output stream with the closing root element.
	 * Call when finished dumping things.
	 */
	function closeStream() {
		return "</mediawiki>\n";
	}


	/**
	 * Opens a <page> section on the output stream, with data
	 * from the given database row.
	 *
	 * @param $row object
	 * @return string
	 * @access private
	 */
	function openPage( $row ) {
		$out = "  <page>\n";
		$title = Title::makeTitle( $row->page_namespace, $row->page_title );
		$out .= '    ' . wfElementClean( 'title', array(), $title->getPrefixedText() ) . "\n";
		$out .= '    ' . wfElement( 'id', array(), strval( $row->page_id ) ) . "\n";
		if( '' != $row->page_restrictions ) {
			$out .= '    ' . wfElement( 'restrictions', array(),
				strval( $row->page_restrictions ) ) . "\n";
		}
		return $out;
	}

	/**
	 * Closes a <page> section on the output stream.
	 *
	 * @access private
	 */
	function closePage() {
		return "  </page>\n";
	}

	/**
	 * Dumps a <revision> section on the output stream, with
	 * data filled in from the given database row.
	 *
	 * @param $row object
	 * @return string
	 * @access private
	 */
	function writeRevision( $row ) {
		$fname = 'WikiExporter::dumpRev';
		wfProfileIn( $fname );

		$out  = "    <revision>\n";
		$out .= "      " . wfElement( 'id', null, strval( $row->rev_id ) ) . "\n";

		$out .= $this->writeTimestamp( $row->rev_timestamp );

		if( $row->rev_deleted & Revision::DELETED_USER ) {
			$out .= "      " . wfElement( 'contributor', array( 'deleted' => 'deleted' ) ) . "\n";
		} else {
			$out .= $this->writeContributor( $row->rev_user, $row->rev_user_text );
		}

		if( $row->rev_minor_edit ) {
			$out .=  "      <minor/>\n";
		}
		if( $row->rev_deleted & Revision::DELETED_COMMENT ) {
			$out .= "      " . wfElement( 'comment', array( 'deleted' => 'deleted' ) ) . "\n";
		} elseif( $row->rev_comment != '' ) {
			$out .= "      " . wfElementClean( 'comment', null, strval( $row->rev_comment ) ) . "\n";
		}

		if( $row->rev_deleted & Revision::DELETED_TEXT ) {
			$out .= "      " . wfElement( 'text', array( 'deleted' => 'deleted' ) ) . "\n";
		} elseif( isset( $row->old_text ) ) {
			// Raw text from the database may have invalid chars
			$text = strval( Revision::getRevisionText( $row ) );
			$out .= "      " . wfElementClean( 'text',
				array( 'xml:space' => 'preserve' ),
				strval( $text ) ) . "\n";
		} else {
			// Stub output
			$out .= "      " . wfElement( 'text',
				array( 'id' => $row->rev_text_id ),
				"" ) . "\n";
		}

		$out .= "    </revision>\n";

		wfProfileOut( $fname );
		return $out;
	}

	function writeTimestamp( $timestamp ) {
		$ts = wfTimestamp( TS_ISO_8601, $timestamp );
		return "      " . wfElement( 'timestamp', null, $ts ) . "\n";
	}

	function writeContributor( $id, $text ) {
		$out = "      <contributor>\n";
		if( $id ) {
			$out .= "        " . wfElementClean( 'username', null, strval( $text ) ) . "\n";
			$out .= "        " . wfElement( 'id', null, strval( $id ) ) . "\n";
		} else {
			$out .= "        " . wfElementClean( 'ip', null, strval( $text ) ) . "\n";
		}
		$out .= "      </contributor>\n";
		return $out;
	}

	/**
	 * Warning! This data is potentially inconsistent. :(
	 */
	function writeUploads( $row ) {
		if( $row->page_namespace == NS_IMAGE ) {
			$img = wfFindFile( $row->page_title );
			if( $img ) {
				$out = '';
				foreach( array_reverse( $img->getHistory() ) as $ver ) {
					$out .= $this->writeUpload( $ver );
				}
				$out .= $this->writeUpload( $img );
				return $out;
			}
		}
		return '';
	}

	function writeUpload( $file ) {
		return "    <upload>\n" .
			$this->writeTimestamp( $file->getTimestamp() ) .
			$this->writeContributor( $file->getUser( 'id' ), $file->getUser( 'text' ) ) .
			"      " . wfElementClean( 'comment', null, $file->getDescription() ) . "\n" .
			"      " . wfElement( 'filename', null, $file->getName() ) . "\n" .
			"      " . wfElement( 'src', null, $file->getFullUrl() ) . "\n" .
			"      " . wfElement( 'size', null, $file->getSize() ) . "\n" .
			"    </upload>\n";
	}

}


/**
 * Base class for output stream; prints to stdout or buffer or whereever.
 * @ingroup Dump
 */
class DumpOutput {
	function writeOpenStream( $string ) {
		$this->write( $string );
	}

	function writeCloseStream( $string ) {
		$this->write( $string );
	}

	function writeOpenPage( $page, $string ) {
		$this->write( $string );
	}

	function writeClosePage( $string ) {
		$this->write( $string );
	}

	function writeRevision( $rev, $string ) {
		$this->write( $string );
	}

	/**
	 * Override to write to a different stream type.
	 * @return bool
	 */
	function write( $string ) {
		print $string;
	}
}

/**
 * Stream outputter to send data to a file.
 * @ingroup Dump
 */
class DumpFileOutput extends DumpOutput {
	var $handle;

	function DumpFileOutput( $file ) {
		$this->handle = fopen( $file, "wt" );
	}

	function write( $string ) {
		fputs( $this->handle, $string );
	}
}

/**
 * Stream outputter to send data to a file via some filter program.
 * Even if compression is available in a library, using a separate
 * program can allow us to make use of a multi-processor system.
 * @ingroup Dump
 */
class DumpPipeOutput extends DumpFileOutput {
	function DumpPipeOutput( $command, $file = null ) {
		if( !is_null( $file ) ) {
			$command .=  " > " . wfEscapeShellArg( $file );
		}
		$this->handle = popen( $command, "w" );
	}
}

/**
 * Sends dump output via the gzip compressor.
 * @ingroup Dump
 */
class DumpGZipOutput extends DumpPipeOutput {
	function DumpGZipOutput( $file ) {
		parent::DumpPipeOutput( "gzip", $file );
	}
}

/**
 * Sends dump output via the bgzip2 compressor.
 * @ingroup Dump
 */
class DumpBZip2Output extends DumpPipeOutput {
	function DumpBZip2Output( $file ) {
		parent::DumpPipeOutput( "bzip2", $file );
	}
}

/**
 * Sends dump output via the p7zip compressor.
 * @ingroup Dump
 */
class Dump7ZipOutput extends DumpPipeOutput {
	function Dump7ZipOutput( $file ) {
		$command = "7za a -bd -si " . wfEscapeShellArg( $file );
		// Suppress annoying useless crap from p7zip
		// Unfortunately this could suppress real error messages too
		$command .= ' >' . wfGetNull() . ' 2>&1';
		parent::DumpPipeOutput( $command );
	}
}



/**
 * Dump output filter class.
 * This just does output filtering and streaming; XML formatting is done
 * higher up, so be careful in what you do.
 * @ingroup Dump
 */
class DumpFilter {
	function DumpFilter( &$sink ) {
		$this->sink =& $sink;
	}

	function writeOpenStream( $string ) {
		$this->sink->writeOpenStream( $string );
	}

	function writeCloseStream( $string ) {
		$this->sink->writeCloseStream( $string );
	}

	function writeOpenPage( $page, $string ) {
		$this->sendingThisPage = $this->pass( $page, $string );
		if( $this->sendingThisPage ) {
			$this->sink->writeOpenPage( $page, $string );
		}
	}

	function writeClosePage( $string ) {
		if( $this->sendingThisPage ) {
			$this->sink->writeClosePage( $string );
			$this->sendingThisPage = false;
		}
	}

	function writeRevision( $rev, $string ) {
		if( $this->sendingThisPage ) {
			$this->sink->writeRevision( $rev, $string );
		}
	}

	/**
	 * Override for page-based filter types.
	 * @return bool
	 */
	function pass( $page ) {
		return true;
	}
}

/**
 * Simple dump output filter to exclude all talk pages.
 * @ingroup Dump
 */
class DumpNotalkFilter extends DumpFilter {
	function pass( $page ) {
		return !MWNamespace::isTalk( $page->page_namespace );
	}
}

/**
 * Dump output filter to include or exclude pages in a given set of namespaces.
 * @ingroup Dump
 */
class DumpNamespaceFilter extends DumpFilter {
	var $invert = false;
	var $namespaces = array();

	function DumpNamespaceFilter( &$sink, $param ) {
		parent::DumpFilter( $sink );

		$constants = array(
			"NS_MAIN"           => NS_MAIN,
			"NS_TALK"           => NS_TALK,
			"NS_USER"           => NS_USER,
			"NS_USER_TALK"      => NS_USER_TALK,
			"NS_PROJECT"        => NS_PROJECT,
			"NS_PROJECT_TALK"   => NS_PROJECT_TALK,
			"NS_IMAGE"          => NS_IMAGE,
			"NS_IMAGE_TALK"     => NS_IMAGE_TALK,
			"NS_MEDIAWIKI"      => NS_MEDIAWIKI,
			"NS_MEDIAWIKI_TALK" => NS_MEDIAWIKI_TALK,
			"NS_TEMPLATE"       => NS_TEMPLATE,
			"NS_TEMPLATE_TALK"  => NS_TEMPLATE_TALK,
			"NS_HELP"           => NS_HELP,
			"NS_HELP_TALK"      => NS_HELP_TALK,
			"NS_CATEGORY"       => NS_CATEGORY,
			"NS_CATEGORY_TALK"  => NS_CATEGORY_TALK );

		if( $param{0} == '!' ) {
			$this->invert = true;
			$param = substr( $param, 1 );
		}

		foreach( explode( ',', $param ) as $key ) {
			$key = trim( $key );
			if( isset( $constants[$key] ) ) {
				$ns = $constants[$key];
				$this->namespaces[$ns] = true;
			} elseif( is_numeric( $key ) ) {
				$ns = intval( $key );
				$this->namespaces[$ns] = true;
			} else {
				throw new MWException( "Unrecognized namespace key '$key'\n" );
			}
		}
	}

	function pass( $page ) {
		$match = isset( $this->namespaces[$page->page_namespace] );
		return $this->invert xor $match;
	}
}


/**
 * Dump output filter to include only the last revision in each page sequence.
 * @ingroup Dump
 */
class DumpLatestFilter extends DumpFilter {
	var $page, $pageString, $rev, $revString;

	function writeOpenPage( $page, $string ) {
		$this->page = $page;
		$this->pageString = $string;
	}

	function writeClosePage( $string ) {
		if( $this->rev ) {
			$this->sink->writeOpenPage( $this->page, $this->pageString );
			$this->sink->writeRevision( $this->rev, $this->revString );
			$this->sink->writeClosePage( $string );
		}
		$this->rev = null;
		$this->revString = null;
		$this->page = null;
		$this->pageString = null;
	}

	function writeRevision( $rev, $string ) {
		if( $rev->rev_id == $this->page->page_latest ) {
			$this->rev = $rev;
			$this->revString = $string;
		}
	}
}

/**
 * Base class for output stream; prints to stdout or buffer or whereever.
 * @ingroup Dump
 */
class DumpMultiWriter {
	function DumpMultiWriter( $sinks ) {
		$this->sinks = $sinks;
		$this->count = count( $sinks );
	}

	function writeOpenStream( $string ) {
		for( $i = 0; $i < $this->count; $i++ ) {
			$this->sinks[$i]->writeOpenStream( $string );
		}
	}

	function writeCloseStream( $string ) {
		for( $i = 0; $i < $this->count; $i++ ) {
			$this->sinks[$i]->writeCloseStream( $string );
		}
	}

	function writeOpenPage( $page, $string ) {
		for( $i = 0; $i < $this->count; $i++ ) {
			$this->sinks[$i]->writeOpenPage( $page, $string );
		}
	}

	function writeClosePage( $string ) {
		for( $i = 0; $i < $this->count; $i++ ) {
			$this->sinks[$i]->writeClosePage( $string );
		}
	}

	function writeRevision( $rev, $string ) {
		for( $i = 0; $i < $this->count; $i++ ) {
			$this->sinks[$i]->writeRevision( $rev, $string );
		}
	}
}

function xmlsafe( $string ) {
	$fname = 'xmlsafe';
	wfProfileIn( $fname );

	/**
	 * The page may contain old data which has not been properly normalized.
	 * Invalid UTF-8 sequences or forbidden control characters will make our
	 * XML output invalid, so be sure to strip them out.
	 */
	$string = UtfNormal::cleanUp( $string );

	$string = htmlspecialchars( $string );
	wfProfileOut( $fname );
	return $string;
}