summaryrefslogtreecommitdiff
path: root/includes/MagicWord.php
blob: f7a9400db21620b4106e34f8bb18f52843f5325c (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
<?php
/**
 * File for magic words
 * @addtogroup Parser
 */

/**
 * This class encapsulates "magic words" such as #redirect, __NOTOC__, etc.
 * Usage:
 *     if (MagicWord::get( 'redirect' )->match( $text ) )
 *
 * Possible future improvements:
 *   * Simultaneous searching for a number of magic words
 *   * MagicWord::$mObjects in shared memory
 *
 * Please avoid reading the data out of one of these objects and then writing
 * special case code. If possible, add another match()-like function here.
 *
 * To add magic words in an extension, use the LanguageGetMagic hook. For 
 * magic words which are also Parser variables, add a MagicWordwgVariableIDs
 * hook. Use string keys.
 *
 */
class MagicWord {
	/**#@+
	 * @private
	 */
	var $mId, $mSynonyms, $mCaseSensitive, $mRegex;
	var $mRegexStart, $mBaseRegex, $mVariableRegex;
	var $mModified, $mFound;

	static public $mVariableIDsInitialised = false;
	static public $mVariableIDs = array(
		'currentmonth',
		'currentmonthname',
		'currentmonthnamegen',
		'currentmonthabbrev',
		'currentday',
		'currentday2',
		'currentdayname',
		'currentyear',
		'currenttime',
		'currenthour',
		'localmonth',
		'localmonthname',
		'localmonthnamegen',
		'localmonthabbrev',
		'localday',
		'localday2',
		'localdayname',
		'localyear',
		'localtime',
		'localhour',
		'numberofarticles',
		'numberoffiles',
		'numberofedits',
		'sitename',
		'server',
		'servername',
		'scriptpath',
		'pagename',
		'pagenamee',
		'fullpagename',
		'fullpagenamee',
		'namespace',
		'namespacee',
		'currentweek',
		'currentdow',
		'localweek',
		'localdow',
		'revisionid',
		'revisionday',
		'revisionday2',
		'revisionmonth',
		'revisionyear',
		'revisiontimestamp',
		'subpagename',
		'subpagenamee',
		'displaytitle',
		'talkspace',
		'talkspacee',
		'subjectspace',
		'subjectspacee',
		'talkpagename',
		'talkpagenamee',
		'subjectpagename',
		'subjectpagenamee',
		'numberofusers',
		'newsectionlink',
		'numberofpages',
		'currentversion',
		'basepagename',
		'basepagenamee',
		'urlencode',
		'currenttimestamp',
		'localtimestamp',
		'directionmark',
		'language',
		'contentlanguage',
		'pagesinnamespace',
		'numberofadmins',
		'defaultsort',
	);

	static public $mObjects = array();

	/**#@-*/

	function __construct($id = 0, $syn = '', $cs = false) {
		$this->mId = $id;
		$this->mSynonyms = (array)$syn;
		$this->mCaseSensitive = $cs;
		$this->mRegex = '';
		$this->mRegexStart = '';
		$this->mVariableRegex = '';
		$this->mVariableStartToEndRegex = '';
		$this->mModified = false;
	}

	/**
	 * Factory: creates an object representing an ID
	 * @static
	 */
	static function &get( $id ) {
		if (!array_key_exists( $id, self::$mObjects ) ) {
			$mw = new MagicWord();
			$mw->load( $id );
			self::$mObjects[$id] = $mw;
		}
		return self::$mObjects[$id];
	}

	/**
	 * Get an array of parser variable IDs
	 */
	static function getVariableIDs() {
		if ( !self::$mVariableIDsInitialised ) {
			# Deprecated constant definition hook, available for extensions that need it
			$magicWords = array();
			wfRunHooks( 'MagicWordMagicWords', array( &$magicWords ) );
			foreach ( $magicWords as $word ) {
				define( $word, $word );
			}

			# Get variable IDs
			wfRunHooks( 'MagicWordwgVariableIDs', array( &self::$mVariableIDs ) );
			self::$mVariableIDsInitialised = true;
		}
		return self::$mVariableIDs;
	}

	# Initialises this object with an ID
	function load( $id ) {
		global $wgContLang;
		$this->mId = $id;
		$wgContLang->getMagic( $this );
		if ( !$this->mSynonyms ) {
			$this->mSynonyms = array( 'dkjsagfjsgashfajsh' );
			#throw new MWException( "Error: invalid magic word '$id'" );
			wfDebugLog( 'exception', "Error: invalid magic word '$id'\n" );
		}
	}

	/**
	 * Preliminary initialisation
	 * @private
	 */
	function initRegex() {
		#$variableClass = Title::legalChars();
		# This was used for matching "$1" variables, but different uses of the feature will have
		# different restrictions, which should be checked *after* the MagicWord has been matched,
		# not here. - IMSoP
		
		$escSyn = array();
		foreach ( $this->mSynonyms as $synonym )
			// In case a magic word contains /, like that's going to happen;)
			$escSyn[] = preg_quote( $synonym, '/' );
		$this->mBaseRegex = implode( '|', $escSyn );
		
		$case = $this->mCaseSensitive ? '' : 'iu';
		$this->mRegex = "/{$this->mBaseRegex}/{$case}";
		$this->mRegexStart = "/^(?:{$this->mBaseRegex})/{$case}";
		$this->mVariableRegex = str_replace( "\\$1", "(.*?)", $this->mRegex );
		$this->mVariableStartToEndRegex = str_replace( "\\$1", "(.*?)",
			"/^(?:{$this->mBaseRegex})$/{$case}" );
	}

	/**
	 * Gets a regex representing matching the word
	 */
	function getRegex() {
		if ($this->mRegex == '' ) {
			$this->initRegex();
		}
		return $this->mRegex;
	}

	/**
	 * Gets the regexp case modifier to use, i.e. i or nothing, to be used if
	 * one is using MagicWord::getBaseRegex(), otherwise it'll be included in
	 * the complete expression
	 */
	function getRegexCase() {
		if ( $this->mRegex === '' )
			$this->initRegex();

		return $this->mCaseSensitive ? '' : 'iu';
	}

	/**
	 * Gets a regex matching the word, if it is at the string start
	 */
	function getRegexStart() {
		if ($this->mRegex == '' ) {
			$this->initRegex();
		}
		return $this->mRegexStart;
	}

	/**
	 * regex without the slashes and what not
	 */
	function getBaseRegex() {
		if ($this->mRegex == '') {
			$this->initRegex();
		}
		return $this->mBaseRegex;
	}

	/**
	 * Returns true if the text contains the word
	 * @return bool
	 */
	function match( $text ) {
		return preg_match( $this->getRegex(), $text );
	}

	/**
	 * Returns true if the text starts with the word
	 * @return bool
	 */
	function matchStart( $text ) {
		return preg_match( $this->getRegexStart(), $text );
	}

	/**
	 * Returns NULL if there's no match, the value of $1 otherwise
	 * The return code is the matched string, if there's no variable
	 * part in the regex and the matched variable part ($1) if there
	 * is one.
	 */
	function matchVariableStartToEnd( $text ) {
		$matches = array();
		$matchcount = preg_match( $this->getVariableStartToEndRegex(), $text, $matches );
		if ( $matchcount == 0 ) {
			return NULL;
		} else {
			# multiple matched parts (variable match); some will be empty because of
			# synonyms. The variable will be the second non-empty one so remove any
			# blank elements and re-sort the indices.
			# See also bug 6526

			$matches = array_values(array_filter($matches));

			if ( count($matches) == 1 ) { return $matches[0]; }
			else { return $matches[1]; }
		}
	}


	/**
	 * Returns true if the text matches the word, and alters the
	 * input string, removing all instances of the word
	 */
	function matchAndRemove( &$text ) {
		$this->mFound = false;
		$text = preg_replace_callback( $this->getRegex(), array( &$this, 'pregRemoveAndRecord' ), $text );
		return $this->mFound;
	}

	function matchStartAndRemove( &$text ) {
		$this->mFound = false;
		$text = preg_replace_callback( $this->getRegexStart(), array( &$this, 'pregRemoveAndRecord' ), $text );
		return $this->mFound;
	}

	/**
	 * Used in matchAndRemove()
	 * @private
	 **/
	function pregRemoveAndRecord( ) {
		$this->mFound = true;
		return '';
	}

	/**
	 * Replaces the word with something else
	 */
	function replace( $replacement, $subject, $limit=-1 ) {
		$res = preg_replace( $this->getRegex(), StringUtils::escapeRegexReplacement( $replacement ), $subject, $limit );
		$this->mModified = !($res === $subject);
		return $res;
	}

	/**
	 * Variable handling: {{SUBST:xxx}} style words
	 * Calls back a function to determine what to replace xxx with
	 * Input word must contain $1
	 */
	function substituteCallback( $text, $callback ) {
		$res = preg_replace_callback( $this->getVariableRegex(), $callback, $text );
		$this->mModified = !($res === $text);
		return $res;
	}

	/**
	 * Matches the word, where $1 is a wildcard
	 */
	function getVariableRegex()	{
		if ( $this->mVariableRegex == '' ) {
			$this->initRegex();
		}
		return $this->mVariableRegex;
	}

	/**
	 * Matches the entire string, where $1 is a wildcard
	 */
	function getVariableStartToEndRegex() {
		if ( $this->mVariableStartToEndRegex == '' ) {
			$this->initRegex();
		}
		return $this->mVariableStartToEndRegex;
	}

	/**
	 * Accesses the synonym list directly
	 */
	function getSynonym( $i ) {
		return $this->mSynonyms[$i];
	}

	function getSynonyms() {
		return $this->mSynonyms;
	}

	/**
	 * Returns true if the last call to replace() or substituteCallback()
	 * returned a modified text, otherwise false.
	 */
	function getWasModified(){
		return $this->mModified;
	}

	/**
	 * $magicarr is an associative array of (magic word ID => replacement)
	 * This method uses the php feature to do several replacements at the same time,
	 * thereby gaining some efficiency. The result is placed in the out variable
	 * $result. The return value is true if something was replaced.
	 * @static
	 **/
	function replaceMultiple( $magicarr, $subject, &$result ){
		$search = array();
		$replace = array();
		foreach( $magicarr as $id => $replacement ){
			$mw = MagicWord::get( $id );
			$search[] = $mw->getRegex();
			$replace[] = $replacement;
		}

		$result = preg_replace( $search, $replace, $subject );
		return !($result === $subject);
	}

	/**
	 * Adds all the synonyms of this MagicWord to an array, to allow quick
	 * lookup in a list of magic words
	 */
	function addToArray( &$array, $value ) {
		global $wgContLang;
		foreach ( $this->mSynonyms as $syn ) {
			$array[$wgContLang->lc($syn)] = $value;
		}
	}

	function isCaseSensitive() {
		return $this->mCaseSensitive;
	}

	function getId() {
		return $this->mId;
	}
}

/**
 * Class for handling an array of magic words
 */
class MagicWordArray {
	var $names = array();
	var $hash;
	var $baseRegex, $regex;

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

	/**
	 * Add a magic word by name
	 */
	public function add( $name ) {
		global $wgContLang;
		$this->names[] = $name;
		$this->hash = $this->baseRegex = $this->regex = null;
	}

	/**
	 * Add a number of magic words by name
	 */
	public function addArray( $names ) {
		$this->names = array_merge( $this->names, array_values( $names ) );
		$this->hash = $this->baseRegex = $this->regex = null;
	}

	/**
	 * Get a 2-d hashtable for this array
	 */
	function getHash() {
		if ( is_null( $this->hash ) ) {
			global $wgContLang;
			$this->hash = array( 0 => array(), 1 => array() );
			foreach ( $this->names as $name ) {
				$magic = MagicWord::get( $name );
				$case = intval( $magic->isCaseSensitive() );
				foreach ( $magic->getSynonyms() as $syn ) {
					if ( !$case ) {
						$syn = $wgContLang->lc( $syn );
					}
					$this->hash[$case][$syn] = $name;
				}
			}
		}
		return $this->hash;
	}

	/**
	 * Get the base regex
	 */
	function getBaseRegex() {
		if ( is_null( $this->baseRegex ) ) {
			$this->baseRegex = array( 0 => '', 1 => '' );
			foreach ( $this->names as $name ) {
				$magic = MagicWord::get( $name );
				$case = intval( $magic->isCaseSensitive() );
				foreach ( $magic->getSynonyms() as $i => $syn ) {
					$group = "(?P<{$i}_{$name}>" . preg_quote( $syn, '/' ) . ')';
					if ( $this->baseRegex[$case] === '' ) {
						$this->baseRegex[$case] = $group;
					} else {
						$this->baseRegex[$case] .= '|' . $group;
					}
				}
			}
		}
		return $this->baseRegex;
	}

	/**
	 * Get an unanchored regex
	 */
	function getRegex() {
		if ( is_null( $this->regex ) ) {
			$base = $this->getBaseRegex();
			$this->regex = array( '', '' );
			if ( $this->baseRegex[0] !== '' ) {
				$this->regex[0] = "/{$base[0]}/iuS";
			}
			if ( $this->baseRegex[1] !== '' ) {
				$this->regex[1] = "/{$base[1]}/S";
			}
		}
		return $this->regex;
	}

	/**
	 * Get a regex for matching variables
	 */
	function getVariableRegex() {
		return str_replace( "\\$1", "(.*?)", $this->getRegex() );
	}

	/**
	 * Get an anchored regex for matching variables
	 */
	function getVariableStartToEndRegex() {
		$base = $this->getBaseRegex();
		$newRegex = array( '', '' );
		if ( $base[0] !== '' ) {
			$newRegex[0] = str_replace( "\\$1", "(.*?)", "/^(?:{$base[0]})$/iuS" );
		}
		if ( $base[1] !== '' ) {
			$newRegex[1] = str_replace( "\\$1", "(.*?)", "/^(?:{$base[1]})$/S" );
		}
		return $newRegex;
	}

	/**
	 * Parse a match array from preg_match
	 */
	function parseMatch( $m ) {
		reset( $m );
		while ( list( $key, $value ) = each( $m ) ) {
			if ( $key === 0 || $value === '' ) {
				continue;
			}
			$parts = explode( '_', $key, 2 );
			if ( count( $parts ) != 2 ) {
				// This shouldn't happen
				// continue;
				throw new MWException( __METHOD__ . ': bad parameter name' );
			}
			list( /* $synIndex */, $magicName ) = $parts;
			$paramValue = next( $m );
			return array( $magicName, $paramValue );
		}
		// This shouldn't happen either
		throw new MWException( __METHOD__.': parameter not found' );
		return array( false, false );
	}

	/**
	 * Match some text, with parameter capture
	 * Returns an array with the magic word name in the first element and the 
	 * parameter in the second element.
	 * Both elements are false if there was no match.
	 */
	public function matchVariableStartToEnd( $text ) {
		global $wgContLang;
		$regexes = $this->getVariableStartToEndRegex();
		foreach ( $regexes as $regex ) {
			if ( $regex !== '' ) {
				$m = false;
				if ( preg_match( $regex, $text, $m ) ) {
					return $this->parseMatch( $m );
				}
			}
		}
		return array( false, false );
	}

	/**
	 * Match some text, without parameter capture
	 * Returns the magic word name, or false if there was no capture
	 */
	public function matchStartToEnd( $text ) {
		$hash = $this->getHash();
		if ( isset( $hash[1][$text] ) ) {
			return $hash[1][$text];
		}
		global $wgContLang;
		$lc = $wgContLang->lc( $text );
		if ( isset( $hash[0][$lc] ) ) {
			return $hash[0][$lc];
		}
		return false;
	}
}