summaryrefslogtreecommitdiff
path: root/extensions/ParserFunctions/ParserFunctions_body.php
blob: d68ed8b7d4d09da0a04b0819e4d5136c803f556f (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
891
<?php

class ExtParserFunctions {
	static $mExprParser;
	static $mConvertParser;
	static $mTimeCache = array();
	static $mTimeChars = 0;
	static $mMaxTimeChars = 6000; # ~10 seconds

	/**
	 * @param $parser Parser
	 * @return bool
	 */
	public static function clearState( $parser ) {
		self::$mTimeChars = 0;
		$parser->pf_ifexist_breakdown = array();
		$parser->pf_markerRegex = null;
		return true;
	}

	/**
	 * Register ParserClearState hook.
	 * We defer this until needed to avoid the loading of the code of this file
	 * when no parser function is actually called.
	 */
	public static function registerClearHook() {
		static $done = false;
		if( !$done ) {
			global $wgHooks;
			$wgHooks['ParserClearState'][] = __CLASS__ . '::clearState';
			$done = true;
		}
	}

	/**
	 * Get the marker regex. Cached.
	 * @param $parser Parser
	 * @return
	 */
	public static function getMarkerRegex( $parser ) {
		self::registerClearHook();
		if ( isset( $parser->pf_markerRegex ) ) {
			return $parser->pf_markerRegex;
		}

		wfProfileIn( __METHOD__ );

		$prefix = preg_quote( $parser->uniqPrefix(), '/' );

		$suffix = preg_quote( Parser::MARKER_SUFFIX, '/' );

		$parser->pf_markerRegex = '/' . $prefix . '(?:(?!' . $suffix . ').)*' . $suffix . '/us';

		wfProfileOut( __METHOD__ );
		return $parser->pf_markerRegex;
	}

	/**
	 * @param $parser Parser
	 * @param $text string
	 * @return string
	 */
	private static function killMarkers ( $parser, $text ) {
		return preg_replace( self::getMarkerRegex( $parser ), '' , $text );
	}

	/**
	 * @return ExprParser
	 */
	public static function &getExprParser() {
		if ( !isset( self::$mExprParser ) ) {
			self::$mExprParser = new ExprParser;
		}
		return self::$mExprParser;
	}

	/**
	 * @param $parser Parser
	 * @param $expr string
	 * @return string
	 */
	public static function expr( $parser, $expr = '' ) {
		try {
			return self::getExprParser()->doExpression( $expr );
		} catch ( ExprError $e ) {
			return $e->getMessage();
		}
	}

	/**
	 * @param $parser Parser
	 * @param $expr string
	 * @param $then string
	 * @param $else string
	 * @return string
	 */
	public static function ifexpr( $parser, $expr = '', $then = '', $else = '' ) {
		try {
			$ret = self::getExprParser()->doExpression( $expr );
			if ( is_numeric( $ret ) ) {
				$ret = floatval( $ret );
			}
			if ( $ret ) {
				return $then;
			} else {
				return $else;
			}
		} catch ( ExprError $e ) {
			return $e->getMessage();
		}
	}

	/**
	 * @param $parser Parser
	 * @param $frame PPFrame
	 * @param $args array
	 * @return string
	 */
	public static function ifexprObj( $parser, $frame, $args ) {
		$expr = isset( $args[0] ) ? trim( $frame->expand( $args[0] ) ) : '';
		$then = isset( $args[1] ) ? $args[1] : '';
		$else = isset( $args[2] ) ? $args[2] : '';
		$result = self::ifexpr( $parser, $expr, $then, $else );
		if ( is_object( $result ) ) {
			$result = trim( $frame->expand( $result ) );
		}
		return $result;
	}

	/**
	 * @param $parser Parser
	 * @param $frame PPFrame
	 * @param $args array
	 * @return string
	 */
	public static function ifObj( $parser, $frame, $args ) {
		$test = isset( $args[0] ) ? trim( $frame->expand( $args[0] ) ) : '';
		if ( $test !== '' ) {
			return isset( $args[1] ) ? trim( $frame->expand( $args[1] ) ) : '';
		} else {
			return isset( $args[2] ) ? trim( $frame->expand( $args[2] ) ) : '';
		}
	}

	/**
	 * @param $parser Parser
	 * @param $frame PPFrame
	 * @param $args array
	 * @return string
	 */
	public static function ifeqObj( $parser, $frame, $args ) {
		$left = isset( $args[0] ) ? trim( $frame->expand( $args[0] ) ) : '';
		$right = isset( $args[1] ) ? trim( $frame->expand( $args[1] ) ) : '';
		if ( $left == $right ) {
			return isset( $args[2] ) ? trim( $frame->expand( $args[2] ) ) : '';
		} else {
			return isset( $args[3] ) ? trim( $frame->expand( $args[3] ) ) : '';
		}
	}

	/**
	 * @param $parser Parser
	 * @param $test string
	 * @param $then string
	 * @param $else bool
	 * @return bool|string
	 */
	public static function iferror( $parser, $test = '', $then = '', $else = false ) {
		if ( preg_match( '/<(?:strong|span|p|div)\s(?:[^\s>]*\s+)*?class="(?:[^"\s>]*\s+)*?error(?:\s[^">]*)?"/', $test ) ) {
			return $then;
		} elseif ( $else === false ) {
			return $test;
		} else {
			return $else;
		}
	}

	/**
	 * @param $parser Parser
	 * @param $frame PPFrame
	 * @param $args array
	 * @return string
	 */
	public static function iferrorObj( $parser, $frame, $args ) {
		$test = isset( $args[0] ) ? trim( $frame->expand( $args[0] ) ) : '';
		$then = isset( $args[1] ) ? $args[1] : false;
		$else = isset( $args[2] ) ? $args[2] : false;
		$result = self::iferror( $parser, $test, $then, $else );
		if ( $result === false ) {
			return '';
		} else {
			return trim( $frame->expand( $result ) );
		}
	}

	/**
	 * @param $parser Parser
	 * @param $frame PPFrame
	 * @param $args
	 * @return string
	 */
	public static function switchObj( $parser, $frame, $args ) {
		if ( count( $args ) == 0 ) {
			return '';
		}
		$primary = trim( $frame->expand( array_shift( $args ) ) );
		$found = $defaultFound = false;
		$default = null;
		$lastItemHadNoEquals = false;
		$mwDefault =& MagicWord::get( 'default' );
		foreach ( $args as $arg ) {
			$bits = $arg->splitArg();
			$nameNode = $bits['name'];
			$index = $bits['index'];
			$valueNode = $bits['value'];

			if ( $index === '' ) {
				# Found "="
				$lastItemHadNoEquals = false;
				if ( $found ) {
					# Multiple input match
					return trim( $frame->expand( $valueNode ) );
				} else {
					$test = trim( $frame->expand( $nameNode ) );
					if ( $test == $primary ) {
						# Found a match, return now
						return trim( $frame->expand( $valueNode ) );
					} elseif ( $defaultFound || $mwDefault->matchStartAndRemove( $test ) ) {
						$default = $valueNode;
					} # else wrong case, continue
				}
			} else {
				# Multiple input, single output
				# If the value matches, set a flag and continue
				$lastItemHadNoEquals = true;
				$test = trim( $frame->expand( $valueNode ) );
				if ( $test == $primary ) {
					$found = true;
				} elseif ( $mwDefault->matchStartAndRemove( $test ) ) {
					$defaultFound = true;
				}
			}
		}
		# Default case
		# Check if the last item had no = sign, thus specifying the default case
		if ( $lastItemHadNoEquals ) {
			return $test;
		} elseif ( !is_null( $default ) ) {
			return trim( $frame->expand( $default ) );
		} else {
			return '';
		}
	}

	/**
	 * Returns the absolute path to a subpage, relative to the current article
	 * title. Treats titles as slash-separated paths.
	 *
	 * Following subpage link syntax instead of standard path syntax, an
	 * initial slash is treated as a relative path, and vice versa.
	 *
	 * @param $parser Parser
	 * @param $to string
	 * @param $from string
	 *
	 * @return string
	 */
	public static function rel2abs( $parser , $to = '' , $from = '' ) {

		$from = trim( $from );
		if ( $from == '' ) {
			$from = $parser->getTitle()->getPrefixedText();
		}

		$to = rtrim( $to , ' /' );

		// if we have an empty path, or just one containing a dot
		if ( $to == '' || $to == '.' ) {
			return $from;
		}

		// if the path isn't relative
		if ( substr( $to , 0 , 1 ) != '/' &&
		 substr( $to , 0 , 2 ) != './' &&
		 substr( $to , 0 , 3 ) != '../' &&
		 $to != '..' )
		{
			$from = '';
		}
		// Make a long path, containing both, enclose it in /.../
		$fullPath = '/' . $from . '/' .  $to . '/';

		// remove redundant current path dots
		$fullPath = preg_replace( '!/(\./)+!', '/', $fullPath );

		// remove double slashes
		$fullPath = preg_replace( '!/{2,}!', '/', $fullPath );

		// remove the enclosing slashes now
		$fullPath = trim( $fullPath , '/' );
		$exploded = explode ( '/' , $fullPath );
		$newExploded = array();

		foreach ( $exploded as $current ) {
			if ( $current == '..' ) { // removing one level
				if ( !count( $newExploded ) ) {
					// attempted to access a node above root node
					return '<strong class="error">' . wfMsgForContent( 'pfunc_rel2abs_invalid_depth', $fullPath ) . '</strong>';
				}
				// remove last level from the stack
				array_pop( $newExploded );
			} else {
				// add the current level to the stack
				$newExploded[] = $current;
			}
		}

		// we can now join it again
		return implode( '/' , $newExploded );
	}

	/**
	 * @param $parser Parser
	 * @param $frame PPFrame
	 * @return bool
	 */
	public static function incrementIfexistCount( $parser, $frame ) {
		// Don't let this be called more than a certain number of times. It tends to make the database explode.
		global $wgExpensiveParserFunctionLimit;
		self::registerClearHook();
		$parser->mExpensiveFunctionCount++;
		if ( $frame ) {
			$pdbk = $frame->getPDBK( 1 );
			if ( !isset( $parser->pf_ifexist_breakdown[$pdbk] ) ) {
				$parser->pf_ifexist_breakdown[$pdbk] = 0;
			}
			$parser->pf_ifexist_breakdown[$pdbk] ++;
		}
		return $parser->mExpensiveFunctionCount <= $wgExpensiveParserFunctionLimit;
	}

	/**
	 * @param $parser Parser
	 * @param $frame PPFrame
	 * @param $titletext string
	 * @param $then string
	 * @param $else string
	 *
	 * @return string
	 */
	public static function ifexistCommon( $parser, $frame, $titletext = '', $then = '', $else = '' ) {
		global $wgContLang;
		$title = Title::newFromText( $titletext );
		$wgContLang->findVariantLink( $titletext, $title, true );
		if ( $title ) {
			if ( $title->getNamespace() == NS_MEDIA ) {
				/* If namespace is specified as NS_MEDIA, then we want to
				 * check the physical file, not the "description" page.
				 */
				if ( !self::incrementIfexistCount( $parser, $frame ) ) {
					return $else;
				}
				$file = wfFindFile( $title );
				if ( !$file ) {
					return $else;
				}
				$parser->mOutput->addImage(
					$file->getName(), $file->getTimestamp(), $file->getSha1() );
				return $file->exists() ? $then : $else;
			} elseif ( $title->getNamespace() == NS_SPECIAL ) {
				/* Don't bother with the count for special pages,
				 * since their existence can be checked without
				 * accessing the database.
				 */
				return SpecialPage::exists( $title->getDBkey() ) ? $then : $else;
			} elseif ( $title->isExternal() ) {
				/* Can't check the existence of pages on other sites,
				 * so just return $else.  Makes a sort of sense, since
				 * they don't exist _locally_.
				 */
				return $else;
			} else {
				$pdbk = $title->getPrefixedDBkey();
				if ( !self::incrementIfexistCount( $parser, $frame ) ) {
					return $else;
				}
				$lc = LinkCache::singleton();
				$id = $lc->getGoodLinkID( $pdbk );
				if ( $id != 0 ) {
					$parser->mOutput->addLink( $title, $id );
					return $then;
				} elseif ( $lc->isBadLink( $pdbk ) ) {
					$parser->mOutput->addLink( $title, 0 );
					return $else;
				}
				$id = $title->getArticleID();
				$parser->mOutput->addLink( $title, $id );
				if ( $id ) {
					return $then;
				}
			}
		}
		return $else;
	}

	/**
	 * @param $parser Parser
	 * @param $frame PPFrame
	 * @param $args array
	 * @return string
	 */
	public static function ifexistObj( $parser, $frame, $args ) {
		$title = isset( $args[0] ) ? trim( $frame->expand( $args[0] ) ) : '';
		$then = isset( $args[1] ) ? $args[1] : null;
		$else = isset( $args[2] ) ? $args[2] : null;

		$result = self::ifexistCommon( $parser, $frame, $title, $then, $else );
		if ( $result === null ) {
			return '';
		} else {
			return trim( $frame->expand( $result ) );
		}
	}

	/**
	 * @param $parser Parser
	 * @param $format string
	 * @param $date string
	 * @param $language string
	 * @param $local string|bool
	 * @return string
	 */
	public static function time( $parser, $format = '', $date = '', $language = '', $local = false ) {
		global $wgLocaltimezone;
		self::registerClearHook();
		if ( $date === '' ) {
			$cacheKey = $parser->getOptions()->getTimestamp();
			$date = wfTimestamp( TS_ISO_8601, $cacheKey );
		} else {
			$cacheKey = $date;
		}
		if ( isset( self::$mTimeCache[$format][$cacheKey][$language][$local] ) ) {
			return self::$mTimeCache[$format][$cacheKey][$language][$local];
		}

		# compute the timestamp string $ts
		# PHP >= 5.2 can handle dates before 1970 or after 2038 using the DateTime object

		$invalidTime = false;

		# the DateTime constructor must be used because it throws exceptions
		# when errors occur, whereas date_create appears to just output a warning
		# that can't really be detected from within the code
		try {

			# Default input timezone is UTC.
			$utc = new DateTimeZone( 'UTC' );

			# Correct for DateTime interpreting 'XXXX' as XX:XX o'clock
			if ( preg_match( '/^[0-9]{4}$/', $date ) ) {
				$date = '00:00 '.$date;
			}

			# Parse date
			# UTC is a default input timezone.
			$dateObject = new DateTime( $date, $utc );

			# Set output timezone.
			if ( $local ) {
				if ( isset( $wgLocaltimezone ) ) {
					$tz = new DateTimeZone( $wgLocaltimezone );
				} else {
					$tz = new DateTimeZone( date_default_timezone_get() );
				}
				$dateObject->setTimezone( $tz );
			} else {
				$dateObject->setTimezone( $utc );
			}
			# Generate timestamp
			$ts = $dateObject->format( 'YmdHis' );

		} catch ( Exception $ex ) {
			$invalidTime = true;
		}

		# format the timestamp and return the result
		if ( $invalidTime ) {
			$result = '<strong class="error">' . wfMsgForContent( 'pfunc_time_error' ) . '</strong>';
		} else {
			self::$mTimeChars += strlen( $format );
			if ( self::$mTimeChars > self::$mMaxTimeChars ) {
				return '<strong class="error">' . wfMsgForContent( 'pfunc_time_too_long' ) . '</strong>';
			} else {
				if ( $ts < 100000000000000 ) { // Language can't deal with years after 9999
					if ( $language !== '' && Language::isValidBuiltInCode( $language ) ) {
						// use whatever language is passed as a parameter
						$langObject = Language::factory( $language );
						$result = $langObject->sprintfDate( $format, $ts );
					} else {
						// use wiki's content language
						$result = $parser->getFunctionLang()->sprintfDate( $format, $ts );
					}
				} else {
					return '<strong class="error">' . wfMsgForContent( 'pfunc_time_too_big' ) . '</strong>';
				}
			}
		}
		self::$mTimeCache[$format][$cacheKey][$language][$local] = $result;
		return $result;
	}

	/**
	 * @param $parser Parser
	 * @param $format string
	 * @param $date string
	 * @param $language string
	 * @return string
	 */
	public static function localTime( $parser, $format = '', $date = '', $language = '' ) {
		return self::time( $parser, $format, $date, $language, true );
	}

	/**
	 * Obtain a specified number of slash-separated parts of a title,
	 * e.g. {{#titleparts:Hello/World|1}} => "Hello"
	 *
	 * @param $parser Parent parser
	 * @param $title string Title to split
	 * @param $parts int Number of parts to keep
	 * @param $offset int Offset starting at 1
	 * @return string
	 */
	public static function titleparts( $parser, $title = '', $parts = 0, $offset = 0 ) {
		$parts = intval( $parts );
		$offset = intval( $offset );
		$ntitle = Title::newFromText( $title );
		if ( $ntitle instanceof Title ) {
			$bits = explode( '/', $ntitle->getPrefixedText(), 25 );
			if ( count( $bits ) <= 0 ) {
				 return $ntitle->getPrefixedText();
			} else {
				if ( $offset > 0 ) {
					--$offset;
				}
				if ( $parts == 0 ) {
					return implode( '/', array_slice( $bits, $offset ) );
				} else {
					return implode( '/', array_slice( $bits, $offset, $parts ) );
				}
			}
		} else {
			return $title;
		}
	}

	/**
	 * Get a ConvertParser object
	 * @return ConvertParser
	 */
	protected static function &getConvertParser() {
		if ( !isset( self::$mConvertParser ) ) {
			self::$mConvertParser = new ConvertParser;
		}
		return self::$mConvertParser;
	}

	/**
	 * @return string
	 */
	public static function convert( /*...*/ ) {
		try {
			$args = func_get_args();
			return self::getConvertParser()->execute( $args );
		} catch ( ConvertError $e ) {
			return $e->getMessage();
		}
	}

	/**
	 *  Verifies parameter is less than max string length.
	 * @param $text
	 * @return bool
	 */
	private static function checkLength( $text ) {
		global $wgPFStringLengthLimit;
		return ( mb_strlen( $text ) < $wgPFStringLengthLimit );
	}

	/**
	 * Generates error message.  Called when string is too long.
	 * @return string
	 */
	private static function tooLongError() {
		global $wgPFStringLengthLimit, $wgContLang;
		return '<strong class="error">' .
			wfMsgExt( 'pfunc_string_too_long',
				array( 'escape', 'parsemag', 'content' ),
				$wgContLang->formatNum( $wgPFStringLengthLimit ) ) .
			'</strong>';
	}

	/**
	 * {{#len:string}}
	 *
	 * Reports number of characters in string.
	 * @param $parser Parser
	 * @param $inStr string
	 * @return int
	 */
	public static function runLen ( $parser, $inStr = '' ) {
		wfProfileIn( __METHOD__ );

		$inStr = self::killMarkers( $parser, (string)$inStr );
		$len = mb_strlen( $inStr );

		wfProfileOut( __METHOD__ );
		return $len;
	}

	/**
	 * {{#pos: string | needle | offset}}
	 *
	 * Finds first occurrence of "needle" in "string" starting at "offset".
	 *
	 * Note: If the needle is an empty string, single space is used instead.
	 * Note: If the needle is not found, empty string is returned.
	 * @param $parser Parser
	 * @param $inStr string
	 * @param $inNeedle int
	 * @param $inOffset int
	 * @return int|string
	 */
	public static function runPos ( $parser, $inStr = '', $inNeedle = '', $inOffset = 0 ) {
		wfProfileIn( __METHOD__ );

		$inStr = self::killMarkers( $parser, (string)$inStr );
		$inNeedle = self::killMarkers( $parser, (string)$inNeedle );

		if ( !self::checkLength( $inStr ) ||
			!self::checkLength( $inNeedle ) ) {
			wfProfileOut( __METHOD__ );
			return self::tooLongError();
		}

		if ( $inNeedle == '' ) { $inNeedle = ' '; }

		$pos = mb_strpos( $inStr, $inNeedle, $inOffset );
		if ( $pos === false ) { $pos = ""; }

		wfProfileOut( __METHOD__ );
		return $pos;
	}

	/**
	 * {{#rpos: string | needle}}
	 *
	 * Finds last occurrence of "needle" in "string".
	 *
	 * Note: If the needle is an empty string, single space is used instead.
	 * Note: If the needle is not found, -1 is returned.
	 * @param $parser Parser
	 * @param $inStr string
	 * @param $inNeedle int
	 * @return int|string
	 */
	public static function runRPos ( $parser, $inStr = '', $inNeedle = '' ) {
		wfProfileIn( __METHOD__ );

		$inStr = self::killMarkers( $parser, (string)$inStr );
		$inNeedle = self::killMarkers( $parser, (string)$inNeedle );

		if ( !self::checkLength( $inStr ) ||
			!self::checkLength( $inNeedle ) ) {
			wfProfileOut( __METHOD__ );
			return self::tooLongError();
		}

		if ( $inNeedle == '' ) { $inNeedle = ' '; }

		$pos = mb_strrpos( $inStr, $inNeedle );
		if ( $pos === false ) { $pos = -1; }

		wfProfileOut( __METHOD__ );
		return $pos;
	}

	/**
	 * {{#sub: string | start | length }}
	 *
	 * Returns substring of "string" starting at "start" and having
	 * "length" characters.
	 *
	 * Note: If length is zero, the rest of the input is returned.
	 * Note: A negative value for "start" operates from the end of the
	 *   "string".
	 * Note: A negative value for "length" returns a string reduced in
	 *   length by that amount.
	 *
	 * @param $parser Parser
	 * @param $inStr string
	 * @param $inStart int
	 * @param $inLength int
	 * @return string
	 */
	public static function runSub ( $parser, $inStr = '', $inStart = 0, $inLength = 0 ) {
		wfProfileIn( __METHOD__ );

		$inStr = self::killMarkers( $parser, (string)$inStr );

		if ( !self::checkLength( $inStr ) ) {
			wfProfileOut( __METHOD__ );
			return self::tooLongError();
		}

		if ( intval( $inLength ) == 0 ) {
			$result = mb_substr( $inStr, $inStart );
		} else {
			$result = mb_substr( $inStr, intval( $inStart ), intval( $inLength ) );
		}

		wfProfileOut( __METHOD__ );
		return $result;
	}

	/**
	 * {{#count: string | substr }}
	 *
	 * Returns number of occurrences of "substr" in "string".
	 *
	 * Note: If "substr" is empty, a single space is used.
	 * @param $parser
	 * @param $inStr string
	 * @param $inSubStr string
	 * @return int|string
	 */
	public static function runCount ( $parser, $inStr = '', $inSubStr = '' ) {
		wfProfileIn( __METHOD__ );

		$inStr = self::killMarkers( $parser, (string)$inStr );
		$inSubStr = self::killMarkers( $parser, (string)$inSubStr );

		if ( !self::checkLength( $inStr ) ||
			!self::checkLength( $inSubStr ) ) {
			wfProfileOut( __METHOD__ );
			return self::tooLongError();
		}

		if ( $inSubStr == '' ) {
			$inSubStr = ' ';
		}

		$result = mb_substr_count( $inStr, $inSubStr );

		wfProfileOut( __METHOD__ );
		return $result;
	}

	/**
	 * {{#replace:string | from | to | limit }}
	 *
	 * Replaces each occurrence of "from" in "string" with "to".
	 * At most "limit" replacements are performed.
	 *
	 * Note: Armored against replacements that would generate huge strings.
	 * Note: If "from" is an empty string, single space is used instead.
	 * @param $parser Parser
	 * @param $inStr string
	 * @param $inReplaceFrom string
	 * @param $inReplaceTo string
	 * @param $inLimit int
	 * @return mixed|string
	 */
	public static function runReplace( $parser, $inStr = '',
			$inReplaceFrom = '', $inReplaceTo = '', $inLimit = -1 ) {
		global $wgPFStringLengthLimit;
		wfProfileIn( __METHOD__ );

		$inStr = self::killMarkers( $parser, (string)$inStr );
		$inReplaceFrom = self::killMarkers( $parser, (string)$inReplaceFrom );
		$inReplaceTo = self::killMarkers( $parser, (string)$inReplaceTo );

		if ( !self::checkLength( $inStr ) ||
			!self::checkLength( $inReplaceFrom ) ||
			!self::checkLength( $inReplaceTo ) ) {
			wfProfileOut( __METHOD__ );
			return self::tooLongError();
		}

		if ( $inReplaceFrom == '' ) { $inReplaceFrom = ' '; }

		// Precompute limit to avoid generating enormous string:
		$diff = mb_strlen( $inReplaceTo ) - mb_strlen( $inReplaceFrom );
		if ( $diff > 0 ) {
			$limit = ( ( $wgPFStringLengthLimit - mb_strlen( $inStr ) ) / $diff ) + 1;
		} else {
			$limit = -1;
		}

		$inLimit = intval( $inLimit );
		if ( $inLimit >= 0 ) {
			if ( $limit > $inLimit || $limit == -1 ) { $limit = $inLimit; }
		}

		// Use regex to allow limit and handle UTF-8 correctly.
		$inReplaceFrom = preg_quote( $inReplaceFrom, '/' );
		$inReplaceTo = StringUtils::escapeRegexReplacement( $inReplaceTo );

		$result = preg_replace( '/' . $inReplaceFrom . '/u',
						$inReplaceTo, $inStr, $limit );

		if ( !self::checkLength( $result ) ) {
			wfProfileOut( __METHOD__ );
			return self::tooLongError();
		}

		wfProfileOut( __METHOD__ );
		return $result;
	}


	/**
	 * {{#explode:string | delimiter | position | limit}}
	 *
	 * Breaks "string" into chunks separated by "delimiter" and returns the
	 * chunk identified by "position".
	 *
	 * Note: Negative position can be used to specify tokens from the end.
	 * Note: If the divider is an empty string, single space is used instead.
	 * Note: Empty string is returned if there are not enough exploded chunks.
	 * @param $parser Parser
	 * @param $inStr string
	 * @param $inDiv string
	 * @param $inPos int
	 * @param $inLim int|null
	 * @return string
	 */
	public static function runExplode ( $parser, $inStr = '', $inDiv = '', $inPos = 0, $inLim = null ) {
		wfProfileIn( __METHOD__ );

		$inStr = self::killMarkers( $parser, (string)$inStr );
		$inDiv = self::killMarkers( $parser, (string)$inDiv );

		if ( $inDiv == '' ) {
			$inDiv = ' ';
		}

		if ( !self::checkLength( $inStr ) ||
			!self::checkLength( $inDiv ) ) {
			wfProfileOut( __METHOD__ );
			return self::tooLongError();
		}

		$inDiv = preg_quote( $inDiv, '/' );

		$matches = preg_split( '/' . $inDiv . '/u', $inStr, $inLim );

		if ( $inPos >= 0 && isset( $matches[$inPos] ) ) {
			$result = $matches[$inPos];
		} elseif ( $inPos < 0 && isset( $matches[count( $matches ) + $inPos] ) ) {
			$result = $matches[count( $matches ) + $inPos];
		} else {
			$result = '';
		}

		wfProfileOut( __METHOD__ );
		return $result;
	}

	/**
	 * {{#urldecode:string}}
	 *
	 * Decodes URL-encoded (like%20that) strings.
	 * @param $parser Parser
	 * @param $inStr string
	 * @return string
	 */
	public static function runUrlDecode( $parser, $inStr = '' ) {
		wfProfileIn( __METHOD__ );

		$inStr = self::killMarkers( $parser, (string)$inStr );
		if ( !self::checkLength( $inStr ) ) {
			wfProfileOut( __METHOD__ );
			return self::tooLongError();
		}

		$result = urldecode( $inStr );

		wfProfileOut( __METHOD__ );
		return $result;
	}
}