summaryrefslogtreecommitdiff
path: root/includes/Xml.php
blob: 37cffdefa0e42de3ae1916429119d8c2b25e8283 (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
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
<?php
/**
 * Methods to generate XML.
 *
 * 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
 *
 * @file
 */

/**
 * Module of static functions for generating XML
 */
class Xml {
	/**
	 * Format an XML element with given attributes and, optionally, text content.
	 * Element and attribute names are assumed to be ready for literal inclusion.
	 * Strings are assumed to not contain XML-illegal characters; special
	 * characters (<, >, &) are escaped but illegals are not touched.
	 *
	 * @param string $element Element name
	 * @param array $attribs Name=>value pairs. Values will be escaped.
	 * @param string $contents Null to make an open tag only; '' for a contentless closed tag (default)
	 * @param bool $allowShortTag Whether '' in $contents will result in a contentless closed tag
	 * @return string
	 */
	public static function element( $element, $attribs = null, $contents = '',
		$allowShortTag = true
	) {
		$out = '<' . $element;
		if ( !is_null( $attribs ) ) {
			$out .= self::expandAttributes( $attribs );
		}
		if ( is_null( $contents ) ) {
			$out .= '>';
		} else {
			if ( $allowShortTag && $contents === '' ) {
				$out .= ' />';
			} else {
				$out .= '>' . htmlspecialchars( $contents ) . "</$element>";
			}
		}
		return $out;
	}

	/**
	 * Given an array of ('attributename' => 'value'), it generates the code
	 * to set the XML attributes : attributename="value".
	 * The values are passed to Sanitizer::encodeAttribute.
	 * Return null if no attributes given.
	 * @param array $attribs Array of attributes for an XML element
	 * @throws MWException
	 * @return null|string
	 */
	public static function expandAttributes( $attribs ) {
		$out = '';
		if ( is_null( $attribs ) ) {
			return null;
		} elseif ( is_array( $attribs ) ) {
			foreach ( $attribs as $name => $val ) {
				$out .= " {$name}=\"" . Sanitizer::encodeAttribute( $val ) . '"';
			}
			return $out;
		} else {
			throw new MWException( 'Expected attribute array, got something else in ' . __METHOD__ );
		}
	}

	/**
	 * Format an XML element as with self::element(), but run text through the
	 * $wgContLang->normalize() validator first to ensure that no invalid UTF-8
	 * is passed.
	 *
	 * @param string $element
	 * @param array $attribs Name=>value pairs. Values will be escaped.
	 * @param string $contents Null to make an open tag only; '' for a contentless closed tag (default)
	 * @return string
	 */
	public static function elementClean( $element, $attribs = array(), $contents = '' ) {
		global $wgContLang;
		if ( $attribs ) {
			$attribs = array_map( array( 'UtfNormal', 'cleanUp' ), $attribs );
		}
		if ( $contents ) {
			$contents = $wgContLang->normalize( $contents );
		}
		return self::element( $element, $attribs, $contents );
	}

	/**
	 * This opens an XML element
	 *
	 * @param string $element Name of the element
	 * @param array $attribs Array of attributes, see Xml::expandAttributes()
	 * @return string
	 */
	public static function openElement( $element, $attribs = null ) {
		return '<' . $element . self::expandAttributes( $attribs ) . '>';
	}

	/**
	 * Shortcut to close an XML element
	 * @param string $element Element name
	 * @return string
	 */
	public static function closeElement( $element ) {
		return "</$element>";
	}

	/**
	 * Same as Xml::element(), but does not escape contents. Handy when the
	 * content you have is already valid xml.
	 *
	 * @param string $element Element name
	 * @param array $attribs Array of attributes
	 * @param string $contents Content of the element
	 * @return string
	 */
	public static function tags( $element, $attribs = null, $contents ) {
		return self::openElement( $element, $attribs ) . $contents . "</$element>";
	}

	/**
	 * Create a date selector
	 *
	 * @param string $selected The month which should be selected, default ''.
	 * @param string $allmonths Value of a special item denoting all month.
	 *   Null to not include (default).
	 * @param string $id Element identifier
	 * @return string Html string containing the month selector
	 */
	public static function monthSelector( $selected = '', $allmonths = null, $id = 'month' ) {
		global $wgLang;
		$options = array();
		$data = new XmlSelect( 'month', $id, $selected );
		if ( is_null( $selected ) ) {
			$selected = '';
		}
		if ( !is_null( $allmonths ) ) {
			$options[wfMessage( 'monthsall' )->text()] = $allmonths;
		}
		for ( $i = 1; $i < 13; $i++ ) {
			$options[$wgLang->getMonthName( $i )] = $i;
		}
		$data->addOptions( $options );
		$data->setAttribute( 'class', 'mw-month-selector' );
		return $data->getHTML();
	}

	/**
	 * @param int $year
	 * @param int $month
	 * @return string Formatted HTML
	 */
	public static function dateMenu( $year, $month ) {
		# Offset overrides year/month selection
		if ( $month && $month !== -1 ) {
			$encMonth = intval( $month );
		} else {
			$encMonth = '';
		}
		if ( $year ) {
			$encYear = intval( $year );
		} elseif ( $encMonth ) {
			$timestamp = MWTimestamp::getInstance();
			$thisMonth = intval( $timestamp->format( 'n' ) );
			$thisYear = intval( $timestamp->format( 'Y' ) );
			if ( intval( $encMonth ) > $thisMonth ) {
				$thisYear--;
			}
			$encYear = $thisYear;
		} else {
			$encYear = '';
		}
		$inputAttribs = array( 'id' => 'year', 'maxlength' => 4, 'size' => 7 );
		return self::label( wfMessage( 'year' )->text(), 'year' ) . ' ' .
			Html::input( 'year', $encYear, 'number', $inputAttribs ) . ' ' .
			self::label( wfMessage( 'month' )->text(), 'month' ) . ' ' .
			self::monthSelector( $encMonth, -1 );
	}

	/**
	 * Construct a language selector appropriate for use in a form or preferences
	 *
	 * @param string $selected The language code of the selected language
	 * @param bool $customisedOnly If true only languages which have some content are listed
	 * @param string $inLanguage The ISO code of the language to display the select list in (optional)
	 * @param array $overrideAttrs Override the attributes of the select tag (since 1.20)
	 * @param Message|null $msg Label message key (since 1.20)
	 * @return array Array containing 2 items: label HTML and select list HTML
	 */
	public static function languageSelector( $selected, $customisedOnly = true,
		$inLanguage = null, $overrideAttrs = array(), Message $msg = null
	) {
		global $wgLanguageCode;

		$include = $customisedOnly ? 'mwfile' : 'mw';
		$languages = Language::fetchLanguageNames( $inLanguage, $include );

		// Make sure the site language is in the list;
		// a custom language code might not have a defined name...
		if ( !array_key_exists( $wgLanguageCode, $languages ) ) {
			$languages[$wgLanguageCode] = $wgLanguageCode;
		}

		ksort( $languages );

		/**
		 * If a bogus value is set, default to the content language.
		 * Otherwise, no default is selected and the user ends up
		 * with Afrikaans since it's first in the list.
		 */
		$selected = isset( $languages[$selected] ) ? $selected : $wgLanguageCode;
		$options = "\n";
		foreach ( $languages as $code => $name ) {
			$options .= Xml::option( "$code - $name", $code, $code == $selected ) . "\n";
		}

		$attrs = array( 'id' => 'wpUserLanguage', 'name' => 'wpUserLanguage' );
		$attrs = array_merge( $attrs, $overrideAttrs );

		if ( $msg === null ) {
			$msg = wfMessage( 'yourlanguage' );
		}
		return array(
			Xml::label( $msg->text(), $attrs['id'] ),
			Xml::tags( 'select', $attrs, $options )
		);

	}

	/**
	 * Shortcut to make a span element
	 * @param string $text Content of the element, will be escaped
	 * @param string $class Class name of the span element
	 * @param array $attribs Other attributes
	 * @return string
	 */
	public static function span( $text, $class, $attribs = array() ) {
		return self::element( 'span', array( 'class' => $class ) + $attribs, $text );
	}

	/**
	 * Shortcut to make a specific element with a class attribute
	 * @param string $text Content of the element, will be escaped
	 * @param string $class Class name of the span element
	 * @param string $tag Element name
	 * @param array $attribs Other attributes
	 * @return string
	 */
	public static function wrapClass( $text, $class, $tag = 'span', $attribs = array() ) {
		return self::tags( $tag, array( 'class' => $class ) + $attribs, $text );
	}

	/**
	 * Convenience function to build an HTML text input field
	 * @param string $name Value of the name attribute
	 * @param int $size Value of the size attribute
	 * @param mixed $value Value of the value attribute
	 * @param array $attribs Other attributes
	 * @return string HTML
	 */
	public static function input( $name, $size = false, $value = false, $attribs = array() ) {
		$attributes = array( 'name' => $name );

		if ( $size ) {
			$attributes['size'] = $size;
		}

		if ( $value !== false ) { // maybe 0
			$attributes['value'] = $value;
		}

		return self::element( 'input',
			Html::getTextInputAttributes( $attributes + $attribs ) );
	}

	/**
	 * Convenience function to build an HTML password input field
	 * @param string $name Value of the name attribute
	 * @param int $size Value of the size attribute
	 * @param mixed $value Value of the value attribute
	 * @param array $attribs Other attributes
	 * @return string HTML
	 */
	public static function password( $name, $size = false, $value = false,
		$attribs = array()
	) {
		return self::input( $name, $size, $value,
			array_merge( $attribs, array( 'type' => 'password' ) ) );
	}

	/**
	 * Internal function for use in checkboxes and radio buttons and such.
	 *
	 * @param string $name
	 * @param bool $present
	 *
	 * @return array
	 */
	public static function attrib( $name, $present = true ) {
		return $present ? array( $name => $name ) : array();
	}

	/**
	 * Convenience function to build an HTML checkbox
	 * @param string $name Value of the name attribute
	 * @param bool $checked Whether the checkbox is checked or not
	 * @param array $attribs Array other attributes
	 * @return string HTML
	 */
	public static function check( $name, $checked = false, $attribs = array() ) {
		return self::element( 'input', array_merge(
			array(
				'name' => $name,
				'type' => 'checkbox',
				'value' => 1 ),
			self::attrib( 'checked', $checked ),
			$attribs ) );
	}

	/**
	 * Convenience function to build an HTML radio button
	 * @param string $name Value of the name attribute
	 * @param string $value Value of the value attribute
	 * @param bool $checked Whether the checkbox is checked or not
	 * @param array $attribs Other attributes
	 * @return string HTML
	 */
	public static function radio( $name, $value, $checked = false, $attribs = array() ) {
		return self::element( 'input', array(
			'name' => $name,
			'type' => 'radio',
			'value' => $value ) + self::attrib( 'checked', $checked ) + $attribs );
	}

	/**
	 * Convenience function to build an HTML form label
	 * @param string $label Text of the label
	 * @param string $id
	 * @param array $attribs An attribute array.  This will usually be
	 *     the same array as is passed to the corresponding input element,
	 *     so this function will cherry-pick appropriate attributes to
	 *     apply to the label as well; only class and title are applied.
	 * @return string HTML
	 */
	public static function label( $label, $id, $attribs = array() ) {
		$a = array( 'for' => $id );

		foreach ( array( 'class', 'title' ) as $attr ) {
			if ( isset( $attribs[$attr] ) ) {
				$a[$attr] = $attribs[$attr];
			}
		}

		return self::element( 'label', $a, $label );
	}

	/**
	 * Convenience function to build an HTML text input field with a label
	 * @param string $label Text of the label
	 * @param string $name Value of the name attribute
	 * @param string $id Id of the input
	 * @param int|bool $size Value of the size attribute
	 * @param string|bool $value Value of the value attribute
	 * @param array $attribs Other attributes
	 * @return string HTML
	 */
	public static function inputLabel( $label, $name, $id, $size = false,
		$value = false, $attribs = array()
	) {
		list( $label, $input ) = self::inputLabelSep( $label, $name, $id, $size, $value, $attribs );
		return $label . '&#160;' . $input;
	}

	/**
	 * Same as Xml::inputLabel() but return input and label in an array
	 *
	 * @param string $label
	 * @param string $name
	 * @param string $id
	 * @param int|bool $size
	 * @param string|bool $value
	 * @param array $attribs
	 *
	 * @return array
	 */
	public static function inputLabelSep( $label, $name, $id, $size = false,
		$value = false, $attribs = array()
	) {
		return array(
			Xml::label( $label, $id, $attribs ),
			self::input( $name, $size, $value, array( 'id' => $id ) + $attribs )
		);
	}

	/**
	 * Convenience function to build an HTML checkbox with a label
	 *
	 * @param string $label
	 * @param string $name
	 * @param string $id
	 * @param bool $checked
	 * @param array $attribs
	 *
	 * @return string HTML
	 */
	public static function checkLabel( $label, $name, $id, $checked = false, $attribs = array() ) {
		global $wgUseMediaWikiUIEverywhere;
		$chkLabel = self::check( $name, $checked, array( 'id' => $id ) + $attribs ) .
			'&#160;' .
			self::label( $label, $id, $attribs );

		if ( $wgUseMediaWikiUIEverywhere ) {
			$chkLabel = self::openElement( 'div', array( 'class' => 'mw-ui-checkbox' ) ) .
				$chkLabel . self::closeElement( 'div' );
		}
		return $chkLabel;
	}

	/**
	 * Convenience function to build an HTML radio button with a label
	 *
	 * @param string $label
	 * @param string $name
	 * @param string $value
	 * @param string $id
	 * @param bool $checked
	 * @param array $attribs
	 *
	 * @return string HTML
	 */
	public static function radioLabel( $label, $name, $value, $id,
		$checked = false, $attribs = array()
	) {
		return self::radio( $name, $value, $checked, array( 'id' => $id ) + $attribs ) .
			'&#160;' .
			self::label( $label, $id, $attribs );
	}

	/**
	 * Convenience function to build an HTML submit button
	 * When $wgUseMediaWikiUIEverywhere is true it will default to a constructive button
	 * @param string $value Label text for the button
	 * @param array $attribs Optional custom attributes
	 * @return string HTML
	 */
	public static function submitButton( $value, $attribs = array() ) {
		global $wgUseMediaWikiUIEverywhere;
		$baseAttrs = array(
			'type' => 'submit',
			'value' => $value,
		);
		// Done conditionally for time being as it is possible
		// some submit forms
		// might need to be mw-ui-destructive (e.g. delete a page)
		if ( $wgUseMediaWikiUIEverywhere ) {
			$baseAttrs['class'] = 'mw-ui-button mw-ui-constructive';
		}
		// Any custom attributes will take precendence of anything in baseAttrs e.g. override the class
		$attribs = $attribs + $baseAttrs;
		return Html::element( 'input', $attribs );
	}

	/**
	 * Convenience function to build an HTML drop-down list item.
	 * @param string $text Text for this item. Will be HTML escaped
	 * @param string $value Form submission value; if empty, use text
	 * @param bool $selected If true, will be the default selected item
	 * @param array $attribs Optional additional HTML attributes
	 * @return string HTML
	 */
	public static function option( $text, $value = null, $selected = false,
			$attribs = array() ) {
		if ( !is_null( $value ) ) {
			$attribs['value'] = $value;
		}
		if ( $selected ) {
			$attribs['selected'] = 'selected';
		}
		return Html::element( 'option', $attribs, $text );
	}

	/**
	 * Build a drop-down box from a textual list.
	 *
	 * @param string $name Name and id for the drop-down
	 * @param string $list Correctly formatted text (newline delimited) to be
	 *   used to generate the options.
	 * @param string $other Text for the "Other reasons" option
	 * @param string $selected Option which should be pre-selected
	 * @param string $class CSS classes for the drop-down
	 * @param int $tabindex Value of the tabindex attribute
	 * @return string
	 */
	public static function listDropDown( $name = '', $list = '', $other = '',
		$selected = '', $class = '', $tabindex = null
	) {
		$optgroup = false;

		$options = self::option( $other, 'other', $selected === 'other' );

		foreach ( explode( "\n", $list ) as $option ) {
			$value = trim( $option );
			if ( $value == '' ) {
				continue;
			} elseif ( substr( $value, 0, 1 ) == '*' && substr( $value, 1, 1 ) != '*' ) {
				// A new group is starting ...
				$value = trim( substr( $value, 1 ) );
				if ( $optgroup ) {
					$options .= self::closeElement( 'optgroup' );
				}
				$options .= self::openElement( 'optgroup', array( 'label' => $value ) );
				$optgroup = true;
			} elseif ( substr( $value, 0, 2 ) == '**' ) {
				// groupmember
				$value = trim( substr( $value, 2 ) );
				$options .= self::option( $value, $value, $selected === $value );
			} else {
				// groupless reason list
				if ( $optgroup ) {
					$options .= self::closeElement( 'optgroup' );
				}
				$options .= self::option( $value, $value, $selected === $value );
				$optgroup = false;
			}
		}

		if ( $optgroup ) {
			$options .= self::closeElement( 'optgroup' );
		}

		$attribs = array();

		if ( $name ) {
			$attribs['id'] = $name;
			$attribs['name'] = $name;
		}

		if ( $class ) {
			$attribs['class'] = $class;
		}

		if ( $tabindex ) {
			$attribs['tabindex'] = $tabindex;
		}

		return Xml::openElement( 'select', $attribs )
			. "\n"
			. $options
			. "\n"
			. Xml::closeElement( 'select' );
	}

	/**
	 * Shortcut for creating fieldsets.
	 *
	 * @param string|bool $legend Legend of the fieldset. If evaluates to false,
	 *   legend is not added.
	 * @param string $content Pre-escaped content for the fieldset. If false,
	 *   only open fieldset is returned.
	 * @param array $attribs Any attributes to fieldset-element.
	 *
	 * @return string
	 */
	public static function fieldset( $legend = false, $content = false, $attribs = array() ) {
		$s = Xml::openElement( 'fieldset', $attribs ) . "\n";

		if ( $legend ) {
			$s .= Xml::element( 'legend', null, $legend ) . "\n";
		}

		if ( $content !== false ) {
			$s .= $content . "\n";
			$s .= Xml::closeElement( 'fieldset' ) . "\n";
		}

		return $s;
	}

	/**
	 * Shortcut for creating textareas.
	 *
	 * @param string $name The 'name' for the textarea
	 * @param string $content Content for the textarea
	 * @param int $cols The number of columns for the textarea
	 * @param int $rows The number of rows for the textarea
	 * @param array $attribs Any other attributes for the textarea
	 *
	 * @return string
	 */
	public static function textarea( $name, $content, $cols = 40, $rows = 5, $attribs = array() ) {
		return self::element( 'textarea',
					Html::getTextInputAttributes(
						array(
							'name' => $name,
							'id' => $name,
							'cols' => $cols,
							'rows' => $rows
						) + $attribs
					),
					$content, false );
	}

	/**
	 * Returns an escaped string suitable for inclusion in a string literal
	 * for JavaScript source code.
	 * Illegal control characters are assumed not to be present.
	 *
	 * @deprecated since 1.21; use Xml::encodeJsVar() or Xml::encodeJsCall() instead
	 * @param string $string String to escape
	 * @return string
	 */
	public static function escapeJsString( $string ) {
		// See ECMA 262 section 7.8.4 for string literal format
		$pairs = array(
			"\\" => "\\\\",
			"\"" => "\\\"",
			'\'' => '\\\'',
			"\n" => "\\n",
			"\r" => "\\r",

			# To avoid closing the element or CDATA section
			"<" => "\\x3c",
			">" => "\\x3e",

			# To avoid any complaints about bad entity refs
			"&" => "\\x26",

			# Work around https://bugzilla.mozilla.org/show_bug.cgi?id=274152
			# Encode certain Unicode formatting chars so affected
			# versions of Gecko don't misinterpret our strings;
			# this is a common problem with Farsi text.
			"\xe2\x80\x8c" => "\\u200c", // ZERO WIDTH NON-JOINER
			"\xe2\x80\x8d" => "\\u200d", // ZERO WIDTH JOINER
		);

		return strtr( $string, $pairs );
	}

	/**
	 * Encode a variable of arbitrary type to JavaScript.
	 * If the value is an XmlJsCode object, pass through the object's value verbatim.
	 *
	 * @note Only use this function for generating JavaScript code. If generating output
	 *       for a proper JSON parser, just call FormatJson::encode() directly.
	 *
	 * @param mixed $value The value being encoded. Can be any type except a resource.
	 * @param bool $pretty If true, add non-significant whitespace to improve readability.
	 * @return string|bool String if successful; false upon failure
	 */
	public static function encodeJsVar( $value, $pretty = false ) {
		if ( $value instanceof XmlJsCode ) {
			return $value->value;
		}
		return FormatJson::encode( $value, $pretty, FormatJson::UTF8_OK );
	}

	/**
	 * Create a call to a JavaScript function. The supplied arguments will be
	 * encoded using Xml::encodeJsVar().
	 *
	 * @since 1.17
	 * @param string $name The name of the function to call, or a JavaScript expression
	 *    which evaluates to a function object which is called.
	 * @param array $args The arguments to pass to the function.
	 * @param bool $pretty If true, add non-significant whitespace to improve readability.
	 * @return string|bool String if successful; false upon failure
	 */
	public static function encodeJsCall( $name, $args, $pretty = false ) {
		foreach ( $args as &$arg ) {
			$arg = Xml::encodeJsVar( $arg, $pretty );
			if ( $arg === false ) {
				return false;
			}
		}

		return "$name(" . ( $pretty
			? ( ' ' . implode( ', ', $args ) . ' ' )
			: implode( ',', $args )
		) . ");";
	}

	/**
	 * Check if a string is well-formed XML.
	 * Must include the surrounding tag.
	 * This function is a DoS vector if an attacker can define
	 * entities in $text.
	 *
	 * @param string $text String to test.
	 * @return bool
	 *
	 * @todo Error position reporting return
	 */
	private static function isWellFormed( $text ) {
		$parser = xml_parser_create( "UTF-8" );

		# case folding violates XML standard, turn it off
		xml_parser_set_option( $parser, XML_OPTION_CASE_FOLDING, false );

		if ( !xml_parse( $parser, $text, true ) ) {
			//$err = xml_error_string( xml_get_error_code( $parser ) );
			//$position = xml_get_current_byte_index( $parser );
			//$fragment = $this->extractFragment( $html, $position );
			//$this->mXmlError = "$err at byte $position:\n$fragment";
			xml_parser_free( $parser );
			return false;
		}

		xml_parser_free( $parser );

		return true;
	}

	/**
	 * Check if a string is a well-formed XML fragment.
	 * Wraps fragment in an \<html\> bit and doctype, so it can be a fragment
	 * and can use HTML named entities.
	 *
	 * @param string $text
	 * @return bool
	 */
	public static function isWellFormedXmlFragment( $text ) {
		$html =
			Sanitizer::hackDocType() .
			'<html>' .
			$text .
			'</html>';

		return Xml::isWellFormed( $html );
	}

	/**
	 * Replace " > and < with their respective HTML entities ( &quot;,
	 * &gt;, &lt;)
	 *
	 * @param string $in Text that might contain HTML tags.
	 * @return string Escaped string
	 */
	public static function escapeTagsOnly( $in ) {
		return str_replace(
			array( '"', '>', '<' ),
			array( '&quot;', '&gt;', '&lt;' ),
			$in );
	}

	/**
	 * Generate a form (without the opening form element).
	 * Output optionally includes a submit button.
	 * @param array $fields Associative array, key is the name of a message that
	 *   contains a description for the field, value is an HTML string
	 *   containing the appropriate input.
	 * @param string $submitLabel The name of a message containing a label for
	 *   the submit button.
	 * @param array $submitAttribs The attributes to add to the submit button
	 * @return string HTML form.
	 */
	public static function buildForm( $fields, $submitLabel = null, $submitAttribs = array() ) {
		$form = '';
		$form .= "<table><tbody>";

		foreach ( $fields as $labelmsg => $input ) {
			$id = "mw-$labelmsg";
			$form .= Xml::openElement( 'tr', array( 'id' => $id ) );

			// TODO use a <label> here for accessibility purposes - will need
			// to either not use a table to build the form, or find the ID of
			// the input somehow.

			$form .= Xml::tags( 'td', array( 'class' => 'mw-label' ), wfMessage( $labelmsg )->parse() );
			$form .= Xml::openElement( 'td', array( 'class' => 'mw-input' ) )
				. $input . Xml::closeElement( 'td' );
			$form .= Xml::closeElement( 'tr' );
		}

		if ( $submitLabel ) {
			$form .= Xml::openElement( 'tr' );
			$form .= Xml::tags( 'td', array(), '' );
			$form .= Xml::openElement( 'td', array( 'class' => 'mw-submit' ) )
				. Xml::submitButton( wfMessage( $submitLabel )->text(), $submitAttribs )
				. Xml::closeElement( 'td' );
			$form .= Xml::closeElement( 'tr' );
		}

		$form .= "</tbody></table>";

		return $form;
	}

	/**
	 * Build a table of data
	 * @param array $rows An array of arrays of strings, each to be a row in a table
	 * @param array $attribs An array of attributes to apply to the table tag [optional]
	 * @param array $headers An array of strings to use as table headers [optional]
	 * @return string
	 */
	public static function buildTable( $rows, $attribs = array(), $headers = null ) {
		$s = Xml::openElement( 'table', $attribs );

		if ( is_array( $headers ) ) {
			$s .= Xml::openElement( 'thead', $attribs );

			foreach ( $headers as $id => $header ) {
				$attribs = array();

				if ( is_string( $id ) ) {
					$attribs['id'] = $id;
				}

				$s .= Xml::element( 'th', $attribs, $header );
			}
			$s .= Xml::closeElement( 'thead' );
		}

		foreach ( $rows as $id => $row ) {
			$attribs = array();

			if ( is_string( $id ) ) {
				$attribs['id'] = $id;
			}

			$s .= Xml::buildTableRow( $attribs, $row );
		}

		$s .= Xml::closeElement( 'table' );

		return $s;
	}

	/**
	 * Build a row for a table
	 * @param array $attribs An array of attributes to apply to the tr tag
	 * @param array $cells An array of strings to put in <td>
	 * @return string
	 */
	public static function buildTableRow( $attribs, $cells ) {
		$s = Xml::openElement( 'tr', $attribs );

		foreach ( $cells as $id => $cell ) {
			$attribs = array();

			if ( is_string( $id ) ) {
				$attribs['id'] = $id;
			}

			$s .= Xml::element( 'td', $attribs, $cell );
		}

		$s .= Xml::closeElement( 'tr' );

		return $s;
	}
}

/**
 * A wrapper class which causes Xml::encodeJsVar() and Xml::encodeJsCall() to
 * interpret a given string as being a JavaScript expression, instead of string
 * data.
 *
 * Example:
 *
 *    Xml::encodeJsVar( new XmlJsCode( 'a + b' ) );
 *
 * Returns "a + b".
 *
 * @note As of 1.21, XmlJsCode objects cannot be nested inside objects or arrays. The sole
 *       exception is the $args argument to Xml::encodeJsCall() because Xml::encodeJsVar() is
 *       called for each individual element in that array.
 *
 * @since 1.17
 */
class XmlJsCode {
	public $value;

	function __construct( $value ) {
		$this->value = $value;
	}
}