5 * See docs/magicword.txt
12 * This class encapsulates "magic words" such as #redirect, __NOTOC__, etc.
14 * if (MagicWord::get( 'redirect' )->match( $text ) )
16 * Possible future improvements:
17 * * Simultaneous searching for a number of magic words
18 * * MagicWord::$mObjects in shared memory
20 * Please avoid reading the data out of one of these objects and then writing
21 * special case code. If possible, add another match()-like function here.
23 * To add magic words in an extension, use the LanguageGetMagic hook. For
24 * magic words which are also Parser variables, add a MagicWordwgVariableIDs
25 * hook. Use string keys.
33 var $mId, $mSynonyms, $mCaseSensitive, $mRegex;
34 var $mRegexStart, $mBaseRegex, $mVariableRegex;
35 var $mModified, $mFound;
37 static public $mVariableIDsInitialised = false;
38 static public $mVariableIDs = array(
42 'currentmonthnamegen',
99 'numberofactiveusers',
112 /* Array of caching hints for ParserCache */
113 static public $mCacheTTLs = array (
114 'currentmonth' => 86400,
115 'currentmonth1' => 86400,
116 'currentmonthname' => 86400,
117 'currentmonthnamegen' => 86400,
118 'currentmonthabbrev' => 86400,
119 'currentday' => 3600,
120 'currentday2' => 3600,
121 'currentdayname' => 3600,
122 'currentyear' => 86400,
123 'currenttime' => 3600,
124 'currenthour' => 3600,
125 'localmonth' => 86400,
126 'localmonth1' => 86400,
127 'localmonthname' => 86400,
128 'localmonthnamegen' => 86400,
129 'localmonthabbrev' => 86400,
132 'localdayname' => 3600,
133 'localyear' => 86400,
136 'numberofarticles' => 3600,
137 'numberoffiles' => 3600,
138 'numberofedits' => 3600,
139 'currentweek' => 3600,
140 'currentdow' => 3600,
143 'numberofusers' => 3600,
144 'numberofactiveusers' => 3600,
145 'numberofpages' => 3600,
146 'currentversion' => 86400,
147 'currenttimestamp' => 3600,
148 'localtimestamp' => 3600,
149 'pagesinnamespace' => 3600,
150 'numberofadmins' => 3600,
151 'numberofviews' => 3600,
152 'numberingroup' => 3600,
155 static public $mDoubleUnderscoreIDs = array(
171 static public $mSubstIDs = array(
176 static public $mObjects = array();
177 static public $mDoubleUnderscoreArray = null;
181 function __construct($id = 0, $syn = array(), $cs = false) {
183 $this->mSynonyms
= (array)$syn;
184 $this->mCaseSensitive
= $cs;
186 $this->mRegexStart
= '';
187 $this->mVariableRegex
= '';
188 $this->mVariableStartToEndRegex
= '';
189 $this->mModified
= false;
193 * Factory: creates an object representing an ID
197 static function &get( $id ) {
198 wfProfileIn( __METHOD__
);
199 if ( !isset( self
::$mObjects[$id] ) ) {
200 $mw = new MagicWord();
202 self
::$mObjects[$id] = $mw;
204 wfProfileOut( __METHOD__
);
205 return self
::$mObjects[$id];
209 * Get an array of parser variable IDs
211 static function getVariableIDs() {
212 if ( !self
::$mVariableIDsInitialised ) {
213 # Deprecated constant definition hook, available for extensions that need it
214 $magicWords = array();
215 wfRunHooks( 'MagicWordMagicWords', array( &$magicWords ) );
216 foreach ( $magicWords as $word ) {
217 define( $word, $word );
221 wfRunHooks( 'MagicWordwgVariableIDs', array( &self
::$mVariableIDs ) );
222 self
::$mVariableIDsInitialised = true;
224 return self
::$mVariableIDs;
228 * Get an array of parser substitution modifier IDs
230 static function getSubstIDs() {
231 return self
::$mSubstIDs;
234 /* Allow external reads of TTL array */
235 static function getCacheTTL($id) {
236 if (array_key_exists($id,self
::$mCacheTTLs)) {
237 return self
::$mCacheTTLs[$id];
243 /** Get a MagicWordArray of double-underscore entities */
244 static function getDoubleUnderscoreArray() {
245 if ( is_null( self
::$mDoubleUnderscoreArray ) ) {
246 self
::$mDoubleUnderscoreArray = new MagicWordArray( self
::$mDoubleUnderscoreIDs );
248 return self
::$mDoubleUnderscoreArray;
252 * Clear the self::$mObjects variable
253 * For use in parser tests
255 public static function clearCache() {
256 self
::$mObjects = array();
259 # Initialises this object with an ID
260 function load( $id ) {
263 $wgContLang->getMagic( $this );
264 if ( !$this->mSynonyms
) {
265 $this->mSynonyms
= array( 'dkjsagfjsgashfajsh' );
266 #throw new MWException( "Error: invalid magic word '$id'" );
267 wfDebugLog( 'exception', "Error: invalid magic word '$id'\n" );
272 * Preliminary initialisation
275 function initRegex() {
276 // Sort the synonyms by length, descending, so that the longest synonym
277 // matches in precedence to the shortest
278 $synonyms = $this->mSynonyms
;
279 usort( $synonyms, array( $this, 'compareStringLength' ) );
282 foreach ( $synonyms as $synonym )
283 // In case a magic word contains /, like that's going to happen;)
284 $escSyn[] = preg_quote( $synonym, '/' );
285 $this->mBaseRegex
= implode( '|', $escSyn );
287 $case = $this->mCaseSensitive ?
'' : 'iu';
288 $this->mRegex
= "/{$this->mBaseRegex}/{$case}";
289 $this->mRegexStart
= "/^(?:{$this->mBaseRegex})/{$case}";
290 $this->mVariableRegex
= str_replace( "\\$1", "(.*?)", $this->mRegex
);
291 $this->mVariableStartToEndRegex
= str_replace( "\\$1", "(.*?)",
292 "/^(?:{$this->mBaseRegex})$/{$case}" );
296 * A comparison function that returns -1, 0 or 1 depending on whether the
297 * first string is longer, the same length or shorter than the second
300 function compareStringLength( $s1, $s2 ) {
305 } elseif ( $l1 > $l2 ) {
313 * Gets a regex representing matching the word
315 function getRegex() {
316 if ($this->mRegex
== '' ) {
319 return $this->mRegex
;
323 * Gets the regexp case modifier to use, i.e. i or nothing, to be used if
324 * one is using MagicWord::getBaseRegex(), otherwise it'll be included in
325 * the complete expression
327 function getRegexCase() {
328 if ( $this->mRegex
=== '' )
331 return $this->mCaseSensitive ?
'' : 'iu';
335 * Gets a regex matching the word, if it is at the string start
337 function getRegexStart() {
338 if ($this->mRegex
== '' ) {
341 return $this->mRegexStart
;
345 * regex without the slashes and what not
347 function getBaseRegex() {
348 if ($this->mRegex
== '') {
351 return $this->mBaseRegex
;
355 * Returns true if the text contains the word
358 function match( $text ) {
359 return (bool)preg_match( $this->getRegex(), $text );
363 * Returns true if the text starts with the word
366 function matchStart( $text ) {
367 return (bool)preg_match( $this->getRegexStart(), $text );
371 * Returns NULL if there's no match, the value of $1 otherwise
372 * The return code is the matched string, if there's no variable
373 * part in the regex and the matched variable part ($1) if there
376 function matchVariableStartToEnd( $text ) {
378 $matchcount = preg_match( $this->getVariableStartToEndRegex(), $text, $matches );
379 if ( $matchcount == 0 ) {
382 # multiple matched parts (variable match); some will be empty because of
383 # synonyms. The variable will be the second non-empty one so remove any
384 # blank elements and re-sort the indices.
387 $matches = array_values(array_filter($matches));
389 if ( count($matches) == 1 ) { return $matches[0]; }
390 else { return $matches[1]; }
396 * Returns true if the text matches the word, and alters the
397 * input string, removing all instances of the word
399 function matchAndRemove( &$text ) {
400 $this->mFound
= false;
401 $text = preg_replace_callback( $this->getRegex(), array( &$this, 'pregRemoveAndRecord' ), $text );
402 return $this->mFound
;
405 function matchStartAndRemove( &$text ) {
406 $this->mFound
= false;
407 $text = preg_replace_callback( $this->getRegexStart(), array( &$this, 'pregRemoveAndRecord' ), $text );
408 return $this->mFound
;
412 * Used in matchAndRemove()
415 function pregRemoveAndRecord( ) {
416 $this->mFound
= true;
421 * Replaces the word with something else
423 function replace( $replacement, $subject, $limit=-1 ) {
424 $res = preg_replace( $this->getRegex(), StringUtils
::escapeRegexReplacement( $replacement ), $subject, $limit );
425 $this->mModified
= !($res === $subject);
430 * Variable handling: {{SUBST:xxx}} style words
431 * Calls back a function to determine what to replace xxx with
432 * Input word must contain $1
434 function substituteCallback( $text, $callback ) {
435 $res = preg_replace_callback( $this->getVariableRegex(), $callback, $text );
436 $this->mModified
= !($res === $text);
441 * Matches the word, where $1 is a wildcard
443 function getVariableRegex() {
444 if ( $this->mVariableRegex
== '' ) {
447 return $this->mVariableRegex
;
451 * Matches the entire string, where $1 is a wildcard
453 function getVariableStartToEndRegex() {
454 if ( $this->mVariableStartToEndRegex
== '' ) {
457 return $this->mVariableStartToEndRegex
;
461 * Accesses the synonym list directly
463 function getSynonym( $i ) {
464 return $this->mSynonyms
[$i];
467 function getSynonyms() {
468 return $this->mSynonyms
;
472 * Returns true if the last call to replace() or substituteCallback()
473 * returned a modified text, otherwise false.
475 function getWasModified(){
476 return $this->mModified
;
480 * $magicarr is an associative array of (magic word ID => replacement)
481 * This method uses the php feature to do several replacements at the same time,
482 * thereby gaining some efficiency. The result is placed in the out variable
483 * $result. The return value is true if something was replaced.
486 function replaceMultiple( $magicarr, $subject, &$result ){
489 foreach( $magicarr as $id => $replacement ){
490 $mw = MagicWord
::get( $id );
491 $search[] = $mw->getRegex();
492 $replace[] = $replacement;
495 $result = preg_replace( $search, $replace, $subject );
496 return !($result === $subject);
500 * Adds all the synonyms of this MagicWord to an array, to allow quick
501 * lookup in a list of magic words
503 function addToArray( &$array, $value ) {
505 foreach ( $this->mSynonyms
as $syn ) {
506 $array[$wgContLang->lc($syn)] = $value;
510 function isCaseSensitive() {
511 return $this->mCaseSensitive
;
520 * Class for handling an array of magic words
523 class MagicWordArray
{
524 var $names = array();
526 var $baseRegex, $regex;
529 function __construct( $names = array() ) {
530 $this->names
= $names;
534 * Add a magic word by name
536 public function add( $name ) {
537 $this->names
[] = $name;
538 $this->hash
= $this->baseRegex
= $this->regex
= null;
542 * Add a number of magic words by name
544 public function addArray( $names ) {
545 $this->names
= array_merge( $this->names
, array_values( $names ) );
546 $this->hash
= $this->baseRegex
= $this->regex
= null;
550 * Get a 2-d hashtable for this array
553 if ( is_null( $this->hash
) ) {
555 $this->hash
= array( 0 => array(), 1 => array() );
556 foreach ( $this->names
as $name ) {
557 $magic = MagicWord
::get( $name );
558 $case = intval( $magic->isCaseSensitive() );
559 foreach ( $magic->getSynonyms() as $syn ) {
561 $syn = $wgContLang->lc( $syn );
563 $this->hash
[$case][$syn] = $name;
573 function getBaseRegex() {
574 if ( is_null( $this->baseRegex
) ) {
575 $this->baseRegex
= array( 0 => '', 1 => '' );
576 foreach ( $this->names
as $name ) {
577 $magic = MagicWord
::get( $name );
578 $case = intval( $magic->isCaseSensitive() );
579 foreach ( $magic->getSynonyms() as $i => $syn ) {
580 $group = "(?P<{$i}_{$name}>" . preg_quote( $syn, '/' ) . ')';
581 if ( $this->baseRegex
[$case] === '' ) {
582 $this->baseRegex
[$case] = $group;
584 $this->baseRegex
[$case] .= '|' . $group;
589 return $this->baseRegex
;
593 * Get an unanchored regex that does not match parameters
595 function getRegex() {
596 if ( is_null( $this->regex
) ) {
597 $base = $this->getBaseRegex();
598 $this->regex
= array( '', '' );
599 if ( $this->baseRegex
[0] !== '' ) {
600 $this->regex
[0] = "/{$base[0]}/iuS";
602 if ( $this->baseRegex
[1] !== '' ) {
603 $this->regex
[1] = "/{$base[1]}/S";
610 * Get a regex for matching variables with parameters
612 function getVariableRegex() {
613 return str_replace( "\\$1", "(.*?)", $this->getRegex() );
617 * Get a regex anchored to the start of the string that does not match parameters
619 function getRegexStart() {
620 $base = $this->getBaseRegex();
621 $newRegex = array( '', '' );
622 if ( $base[0] !== '' ) {
623 $newRegex[0] = "/^(?:{$base[0]})/iuS";
625 if ( $base[1] !== '' ) {
626 $newRegex[1] = "/^(?:{$base[1]})/S";
632 * Get an anchored regex for matching variables with parameters
634 function getVariableStartToEndRegex() {
635 $base = $this->getBaseRegex();
636 $newRegex = array( '', '' );
637 if ( $base[0] !== '' ) {
638 $newRegex[0] = str_replace( "\\$1", "(.*?)", "/^(?:{$base[0]})$/iuS" );
640 if ( $base[1] !== '' ) {
641 $newRegex[1] = str_replace( "\\$1", "(.*?)", "/^(?:{$base[1]})$/S" );
647 * Parse a match array from preg_match
648 * Returns array(magic word ID, parameter value)
649 * If there is no parameter value, that element will be false.
651 function parseMatch( $m ) {
653 while ( list( $key, $value ) = each( $m ) ) {
654 if ( $key === 0 ||
$value === '' ) {
657 $parts = explode( '_', $key, 2 );
658 if ( count( $parts ) != 2 ) {
659 // This shouldn't happen
661 throw new MWException( __METHOD__
. ': bad parameter name' );
663 list( /* $synIndex */, $magicName ) = $parts;
664 $paramValue = next( $m );
665 return array( $magicName, $paramValue );
667 // This shouldn't happen either
668 throw new MWException( __METHOD__
.': parameter not found' );
672 * Match some text, with parameter capture
673 * Returns an array with the magic word name in the first element and the
674 * parameter in the second element.
675 * Both elements are false if there was no match.
677 public function matchVariableStartToEnd( $text ) {
678 $regexes = $this->getVariableStartToEndRegex();
679 foreach ( $regexes as $regex ) {
680 if ( $regex !== '' ) {
682 if ( preg_match( $regex, $text, $m ) ) {
683 return $this->parseMatch( $m );
687 return array( false, false );
691 * Match some text, without parameter capture
692 * Returns the magic word name, or false if there was no capture
694 public function matchStartToEnd( $text ) {
695 $hash = $this->getHash();
696 if ( isset( $hash[1][$text] ) ) {
697 return $hash[1][$text];
700 $lc = $wgContLang->lc( $text );
701 if ( isset( $hash[0][$lc] ) ) {
702 return $hash[0][$lc];
708 * Returns an associative array, ID => param value, for all items that match
709 * Removes the matched items from the input string (passed by reference)
711 public function matchAndRemove( &$text ) {
713 $regexes = $this->getRegex();
714 foreach ( $regexes as $regex ) {
715 if ( $regex === '' ) {
718 preg_match_all( $regex, $text, $matches, PREG_SET_ORDER
);
719 foreach ( $matches as $m ) {
720 list( $name, $param ) = $this->parseMatch( $m );
721 $found[$name] = $param;
723 $text = preg_replace( $regex, '', $text );
729 * Return the ID of the magic word at the start of $text, and remove
730 * the prefix from $text.
731 * Return false if no match found and $text is not modified.
732 * Does not match parameters.
734 public function matchStartAndRemove( &$text ) {
735 $regexes = $this->getRegexStart();
736 foreach ( $regexes as $regex ) {
737 if ( $regex === '' ) {
740 if ( preg_match( $regex, $text, $m ) ) {
741 list( $id, ) = $this->parseMatch( $m );
742 if ( strlen( $m[0] ) >= strlen( $text ) ) {
745 $text = substr( $text, strlen( $m[0] ) );