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[lhc/web/wiklou.git] / resources / src / mediawiki / mediawiki.js
1 /**
2 * Base library for MediaWiki.
3 *
4 * Exposed as globally as `mediaWiki` with `mw` as shortcut.
5 *
6 * @class mw
7 * @alternateClassName mediaWiki
8 * @singleton
9 */
10 ( function ( $ ) {
11 'use strict';
12
13 /* Private Members */
14
15 var mw,
16 hasOwn = Object.prototype.hasOwnProperty,
17 slice = Array.prototype.slice,
18 trackCallbacks = $.Callbacks( 'memory' ),
19 trackQueue = [];
20
21 /**
22 * Log a message to window.console, if possible. Useful to force logging of some
23 * errors that are otherwise hard to detect (I.e., this logs also in production mode).
24 * Gets console references in each invocation, so that delayed debugging tools work
25 * fine. No need for optimization here, which would only result in losing logs.
26 *
27 * @private
28 * @method log_
29 * @param {string} msg text for the log entry.
30 * @param {Error} [e]
31 */
32 function log( msg, e ) {
33 var console = window.console;
34 if ( console && console.log ) {
35 console.log( msg );
36 // If we have an exception object, log it through .error() to trigger
37 // proper stacktraces in browsers that support it. There are no (known)
38 // browsers that don't support .error(), that do support .log() and
39 // have useful exception handling through .log().
40 if ( e && console.error ) {
41 console.error( String( e ), e );
42 }
43 }
44 }
45
46 /* Object constructors */
47
48 /**
49 * Creates an object that can be read from or written to from prototype functions
50 * that allow both single and multiple variables at once.
51 *
52 * @example
53 *
54 * var addies, wanted, results;
55 *
56 * // Create your address book
57 * addies = new mw.Map();
58 *
59 * // This data could be coming from an external source (eg. API/AJAX)
60 * addies.set( {
61 * 'John Doe' : '10 Wall Street, New York, USA',
62 * 'Jane Jackson' : '21 Oxford St, London, UK',
63 * 'Dominique van Halen' : 'Kalverstraat 7, Amsterdam, NL'
64 * } );
65 *
66 * wanted = ['Dominique van Halen', 'George Johnson', 'Jane Jackson'];
67 *
68 * // You can detect missing keys first
69 * if ( !addies.exists( wanted ) ) {
70 * // One or more are missing (in this case: "George Johnson")
71 * mw.log( 'One or more names were not found in your address book' );
72 * }
73 *
74 * // Or just let it give you what it can
75 * results = addies.get( wanted, 'Middle of Nowhere, Alaska, US' );
76 * mw.log( results['Jane Jackson'] ); // "21 Oxford St, London, UK"
77 * mw.log( results['George Johnson'] ); // "Middle of Nowhere, Alaska, US"
78 *
79 * @class mw.Map
80 *
81 * @constructor
82 * @param {Object|boolean} [values] Value-bearing object to map, or boolean
83 * true to map over the global object. Defaults to an empty object.
84 */
85 function Map( values ) {
86 this.values = values === true ? window : ( values || {} );
87 return this;
88 }
89
90 Map.prototype = {
91 /**
92 * Get the value of one or multiple a keys.
93 *
94 * If called with no arguments, all values will be returned.
95 *
96 * @param {string|Array} selection String key or array of keys to get values for.
97 * @param {Mixed} [fallback] Value to use in case key(s) do not exist.
98 * @return mixed If selection was a string returns the value or null,
99 * If selection was an array, returns an object of key/values (value is null if not found),
100 * If selection was not passed or invalid, will return the 'values' object member (be careful as
101 * objects are always passed by reference in JavaScript!).
102 * @return {string|Object|null} Values as a string or object, null if invalid/inexistant.
103 */
104 get: function ( selection, fallback ) {
105 var results, i;
106 // If we only do this in the `return` block, it'll fail for the
107 // call to get() from the mutli-selection block.
108 fallback = arguments.length > 1 ? fallback : null;
109
110 if ( $.isArray( selection ) ) {
111 selection = slice.call( selection );
112 results = {};
113 for ( i = 0; i < selection.length; i++ ) {
114 results[selection[i]] = this.get( selection[i], fallback );
115 }
116 return results;
117 }
118
119 if ( typeof selection === 'string' ) {
120 if ( !hasOwn.call( this.values, selection ) ) {
121 return fallback;
122 }
123 return this.values[selection];
124 }
125
126 if ( selection === undefined ) {
127 return this.values;
128 }
129
130 // invalid selection key
131 return null;
132 },
133
134 /**
135 * Sets one or multiple key/value pairs.
136 *
137 * @param {string|Object} selection String key to set value for, or object mapping keys to values.
138 * @param {Mixed} [value] Value to set (optional, only in use when key is a string)
139 * @return {Boolean} This returns true on success, false on failure.
140 */
141 set: function ( selection, value ) {
142 var s;
143
144 if ( $.isPlainObject( selection ) ) {
145 for ( s in selection ) {
146 this.values[s] = selection[s];
147 }
148 return true;
149 }
150 if ( typeof selection === 'string' && arguments.length > 1 ) {
151 this.values[selection] = value;
152 return true;
153 }
154 return false;
155 },
156
157 /**
158 * Checks if one or multiple keys exist.
159 *
160 * @param {Mixed} selection String key or array of keys to check
161 * @return {boolean} Existence of key(s)
162 */
163 exists: function ( selection ) {
164 var s;
165
166 if ( $.isArray( selection ) ) {
167 for ( s = 0; s < selection.length; s++ ) {
168 if ( typeof selection[s] !== 'string' || !hasOwn.call( this.values, selection[s] ) ) {
169 return false;
170 }
171 }
172 return true;
173 }
174 return typeof selection === 'string' && hasOwn.call( this.values, selection );
175 }
176 };
177
178 /**
179 * Object constructor for messages.
180 *
181 * Similar to the Message class in MediaWiki PHP.
182 *
183 * Format defaults to 'text'.
184 *
185 * @example
186 *
187 * var obj, str;
188 * mw.messages.set( {
189 * 'hello': 'Hello world',
190 * 'hello-user': 'Hello, $1!',
191 * 'welcome-user': 'Welcome back to $2, $1! Last visit by $1: $3'
192 * } );
193 *
194 * obj = new mw.Message( mw.messages, 'hello' );
195 * mw.log( obj.text() );
196 * // Hello world
197 *
198 * obj = new mw.Message( mw.messages, 'hello-user', [ 'John Doe' ] );
199 * mw.log( obj.text() );
200 * // Hello, John Doe!
201 *
202 * obj = new mw.Message( mw.messages, 'welcome-user', [ 'John Doe', 'Wikipedia', '2 hours ago' ] );
203 * mw.log( obj.text() );
204 * // Welcome back to Wikipedia, John Doe! Last visit by John Doe: 2 hours ago
205 *
206 * // Using mw.message shortcut
207 * obj = mw.message( 'hello-user', 'John Doe' );
208 * mw.log( obj.text() );
209 * // Hello, John Doe!
210 *
211 * // Using mw.msg shortcut
212 * str = mw.msg( 'hello-user', 'John Doe' );
213 * mw.log( str );
214 * // Hello, John Doe!
215 *
216 * // Different formats
217 * obj = new mw.Message( mw.messages, 'hello-user', [ 'John "Wiki" <3 Doe' ] );
218 *
219 * obj.format = 'text';
220 * str = obj.toString();
221 * // Same as:
222 * str = obj.text();
223 *
224 * mw.log( str );
225 * // Hello, John "Wiki" <3 Doe!
226 *
227 * mw.log( obj.escaped() );
228 * // Hello, John &quot;Wiki&quot; &lt;3 Doe!
229 *
230 * @class mw.Message
231 *
232 * @constructor
233 * @param {mw.Map} map Message storage
234 * @param {string} key
235 * @param {Array} [parameters]
236 */
237 function Message( map, key, parameters ) {
238 this.format = 'text';
239 this.map = map;
240 this.key = key;
241 this.parameters = parameters === undefined ? [] : slice.call( parameters );
242 return this;
243 }
244
245 Message.prototype = {
246 /**
247 * Simple message parser, does $N replacement and nothing else.
248 *
249 * This may be overridden to provide a more complex message parser.
250 *
251 * The primary override is in mediawiki.jqueryMsg.
252 *
253 * This function will not be called for nonexistent messages.
254 */
255 parser: function () {
256 var parameters = this.parameters;
257 return this.map.get( this.key ).replace( /\$(\d+)/g, function ( str, match ) {
258 var index = parseInt( match, 10 ) - 1;
259 return parameters[index] !== undefined ? parameters[index] : '$' + match;
260 } );
261 },
262
263 /**
264 * Appends (does not replace) parameters for replacement to the .parameters property.
265 *
266 * @param {Array} parameters
267 * @chainable
268 */
269 params: function ( parameters ) {
270 var i;
271 for ( i = 0; i < parameters.length; i += 1 ) {
272 this.parameters.push( parameters[i] );
273 }
274 return this;
275 },
276
277 /**
278 * Converts message object to its string form based on the state of format.
279 *
280 * @return {string} Message as a string in the current form or `<key>` if key does not exist.
281 */
282 toString: function () {
283 var text;
284
285 if ( !this.exists() ) {
286 // Use <key> as text if key does not exist
287 if ( this.format === 'escaped' || this.format === 'parse' ) {
288 // format 'escaped' and 'parse' need to have the brackets and key html escaped
289 return mw.html.escape( '<' + this.key + '>' );
290 }
291 return '<' + this.key + '>';
292 }
293
294 if ( this.format === 'plain' || this.format === 'text' || this.format === 'parse' ) {
295 text = this.parser();
296 }
297
298 if ( this.format === 'escaped' ) {
299 text = this.parser();
300 text = mw.html.escape( text );
301 }
302
303 return text;
304 },
305
306 /**
307 * Changes format to 'parse' and converts message to string
308 *
309 * If jqueryMsg is loaded, this parses the message text from wikitext
310 * (where supported) to HTML
311 *
312 * Otherwise, it is equivalent to plain.
313 *
314 * @return {string} String form of parsed message
315 */
316 parse: function () {
317 this.format = 'parse';
318 return this.toString();
319 },
320
321 /**
322 * Changes format to 'plain' and converts message to string
323 *
324 * This substitutes parameters, but otherwise does not change the
325 * message text.
326 *
327 * @return {string} String form of plain message
328 */
329 plain: function () {
330 this.format = 'plain';
331 return this.toString();
332 },
333
334 /**
335 * Changes format to 'text' and converts message to string
336 *
337 * If jqueryMsg is loaded, {{-transformation is done where supported
338 * (such as {{plural:}}, {{gender:}}, {{int:}}).
339 *
340 * Otherwise, it is equivalent to plain.
341 */
342 text: function () {
343 this.format = 'text';
344 return this.toString();
345 },
346
347 /**
348 * Changes the format to 'escaped' and converts message to string
349 *
350 * This is equivalent to using the 'text' format (see text method), then
351 * HTML-escaping the output.
352 *
353 * @return {string} String form of html escaped message
354 */
355 escaped: function () {
356 this.format = 'escaped';
357 return this.toString();
358 },
359
360 /**
361 * Checks if message exists
362 *
363 * @see mw.Map#exists
364 * @return {boolean}
365 */
366 exists: function () {
367 return this.map.exists( this.key );
368 }
369 };
370
371 /**
372 * @class mw
373 */
374 mw = {
375 /* Public Members */
376
377 /**
378 * Get the current time, measured in milliseconds since January 1, 1970 (UTC).
379 *
380 * On browsers that implement the Navigation Timing API, this function will produce floating-point
381 * values with microsecond precision that are guaranteed to be monotonic. On all other browsers,
382 * it will fall back to using `Date`.
383 *
384 * @return {number} Current time
385 */
386 now: ( function () {
387 var perf = window.performance,
388 navStart = perf && perf.timing && perf.timing.navigationStart;
389 return navStart && typeof perf.now === 'function' ?
390 function () { return navStart + perf.now(); } :
391 function () { return +new Date(); };
392 }() ),
393
394 /**
395 * Track an analytic event.
396 *
397 * This method provides a generic means for MediaWiki JavaScript code to capture state
398 * information for analysis. Each logged event specifies a string topic name that describes
399 * the kind of event that it is. Topic names consist of dot-separated path components,
400 * arranged from most general to most specific. Each path component should have a clear and
401 * well-defined purpose.
402 *
403 * Data handlers are registered via `mw.trackSubscribe`, and receive the full set of
404 * events that match their subcription, including those that fired before the handler was
405 * bound.
406 *
407 * @param {string} topic Topic name
408 * @param {Object} [data] Data describing the event, encoded as an object
409 */
410 track: function ( topic, data ) {
411 trackQueue.push( { topic: topic, timeStamp: mw.now(), data: data } );
412 trackCallbacks.fire( trackQueue );
413 },
414
415 /**
416 * Register a handler for subset of analytic events, specified by topic
417 *
418 * Handlers will be called once for each tracked event, including any events that fired before the
419 * handler was registered; 'this' is set to a plain object with a 'timeStamp' property indicating
420 * the exact time at which the event fired, a string 'topic' property naming the event, and a
421 * 'data' property which is an object of event-specific data. The event topic and event data are
422 * also passed to the callback as the first and second arguments, respectively.
423 *
424 * @param {string} topic Handle events whose name starts with this string prefix
425 * @param {Function} callback Handler to call for each matching tracked event
426 */
427 trackSubscribe: function ( topic, callback ) {
428 var seen = 0;
429
430 trackCallbacks.add( function ( trackQueue ) {
431 var event;
432 for ( ; seen < trackQueue.length; seen++ ) {
433 event = trackQueue[ seen ];
434 if ( event.topic.indexOf( topic ) === 0 ) {
435 callback.call( event, event.topic, event.data );
436 }
437 }
438 } );
439 },
440
441 // Make the Map constructor publicly available.
442 Map: Map,
443
444 // Make the Message constructor publicly available.
445 Message: Message,
446
447 /**
448 * Map of configuration values
449 *
450 * Check out [the complete list of configuration values](https://www.mediawiki.org/wiki/Manual:Interface/JavaScript#mw.config)
451 * on mediawiki.org.
452 *
453 * If `$wgLegacyJavaScriptGlobals` is true, this Map will add its values to the
454 * global `window` object.
455 *
456 * @property {mw.Map} config
457 */
458 // Dummy placeholder. Re-assigned in ResourceLoaderStartupModule to an instance of `mw.Map`.
459 config: null,
460
461 /**
462 * Empty object that plugins can be installed in.
463 * @property
464 */
465 libs: {},
466
467 /**
468 * Access container for deprecated functionality that can be moved from
469 * from their legacy location and attached to this object (e.g. a global
470 * function that is deprecated and as stop-gap can be exposed through here).
471 *
472 * This was reserved for future use but never ended up being used.
473 *
474 * @deprecated since 1.22 Let deprecated identifiers keep their original name
475 * and use mw.log#deprecate to create an access container for tracking.
476 * @property
477 */
478 legacy: {},
479
480 /**
481 * Localization system
482 * @property {mw.Map}
483 */
484 messages: new Map(),
485
486 /* Public Methods */
487
488 /**
489 * Get a message object.
490 *
491 * Shorcut for `new mw.Message( mw.messages, key, parameters )`.
492 *
493 * @see mw.Message
494 * @param {string} key Key of message to get
495 * @param {Mixed...} parameters Parameters for the $N replacements in messages.
496 * @return {mw.Message}
497 */
498 message: function ( key ) {
499 // Variadic arguments
500 var parameters = slice.call( arguments, 1 );
501 return new Message( mw.messages, key, parameters );
502 },
503
504 /**
505 * Get a message string using the (default) 'text' format.
506 *
507 * Shortcut for `mw.message( key, parameters... ).text()`.
508 *
509 * @see mw.Message
510 * @param {string} key Key of message to get
511 * @param {Mixed...} parameters Parameters for the $N replacements in messages.
512 * @return {string}
513 */
514 msg: function () {
515 return mw.message.apply( mw.message, arguments ).toString();
516 },
517
518 /**
519 * Dummy placeholder for {@link mw.log}
520 * @method
521 */
522 log: ( function () {
523 // Also update the restoration of methods in mediawiki.log.js
524 // when adding or removing methods here.
525 var log = function () {};
526
527 /**
528 * @class mw.log
529 * @singleton
530 */
531
532 /**
533 * Write a message the console's warning channel.
534 * Also logs a stacktrace for easier debugging.
535 * Each action is silently ignored if the browser doesn't support it.
536 *
537 * @param {string...} msg Messages to output to console
538 */
539 log.warn = function () {
540 var console = window.console;
541 if ( console && console.warn && console.warn.apply ) {
542 console.warn.apply( console, arguments );
543 if ( console.trace ) {
544 console.trace();
545 }
546 }
547 };
548
549 /**
550 * Create a property in a host object that, when accessed, will produce
551 * a deprecation warning in the console with backtrace.
552 *
553 * @param {Object} obj Host object of deprecated property
554 * @param {string} key Name of property to create in `obj`
555 * @param {Mixed} val The value this property should return when accessed
556 * @param {string} [msg] Optional text to include in the deprecation message.
557 */
558 log.deprecate = !Object.defineProperty ? function ( obj, key, val ) {
559 obj[key] = val;
560 } : function ( obj, key, val, msg ) {
561 msg = 'Use of "' + key + '" is deprecated.' + ( msg ? ( ' ' + msg ) : '' );
562 try {
563 Object.defineProperty( obj, key, {
564 configurable: true,
565 enumerable: true,
566 get: function () {
567 mw.track( 'mw.deprecate', key );
568 mw.log.warn( msg );
569 return val;
570 },
571 set: function ( newVal ) {
572 mw.track( 'mw.deprecate', key );
573 mw.log.warn( msg );
574 val = newVal;
575 }
576 } );
577 } catch ( err ) {
578 // IE8 can throw on Object.defineProperty
579 obj[key] = val;
580 }
581 };
582
583 return log;
584 }() ),
585
586 /**
587 * Client-side module loader which integrates with the MediaWiki ResourceLoader
588 * @class mw.loader
589 * @singleton
590 */
591 loader: ( function () {
592
593 /* Private Members */
594
595 /**
596 * Mapping of registered modules
597 *
598 * The jquery module is pre-registered, because it must have already
599 * been provided for this object to have been built, and in debug mode
600 * jquery would have been provided through a unique loader request,
601 * making it impossible to hold back registration of jquery until after
602 * mediawiki.
603 *
604 * For exact details on support for script, style and messages, look at
605 * mw.loader.implement.
606 *
607 * Format:
608 * {
609 * 'moduleName': {
610 * 'version': ############## (unix timestamp),
611 * 'dependencies': ['required.foo', 'bar.also', ...], (or) function () {}
612 * 'group': 'somegroup', (or) null,
613 * 'source': 'local', 'someforeignwiki', (or) null
614 * 'state': 'registered', 'loaded', 'loading', 'ready', 'error' or 'missing'
615 * 'script': ...,
616 * 'style': ...,
617 * 'messages': { 'key': 'value' },
618 * }
619 * }
620 *
621 * @property
622 * @private
623 */
624 var registry = {},
625 //
626 // Mapping of sources, keyed by source-id, values are objects.
627 // Format:
628 // {
629 // 'sourceId': {
630 // 'loadScript': 'http://foo.bar/w/load.php'
631 // }
632 // }
633 //
634 sources = {},
635 // List of modules which will be loaded as when ready
636 batch = [],
637 // List of modules to be loaded
638 queue = [],
639 // List of callback functions waiting for modules to be ready to be called
640 jobs = [],
641 // Selector cache for the marker element. Use getMarker() to get/use the marker!
642 $marker = null,
643 // Buffer for addEmbeddedCSS.
644 cssBuffer = '',
645 // Callbacks for addEmbeddedCSS.
646 cssCallbacks = $.Callbacks();
647
648 /* Private methods */
649
650 function getMarker() {
651 // Cached ?
652 if ( $marker ) {
653 return $marker;
654 }
655
656 $marker = $( 'meta[name="ResourceLoaderDynamicStyles"]' );
657 if ( $marker.length ) {
658 return $marker;
659 }
660 mw.log( 'getMarker> No <meta name="ResourceLoaderDynamicStyles"> found, inserting dynamically.' );
661 $marker = $( '<meta>' ).attr( 'name', 'ResourceLoaderDynamicStyles' ).appendTo( 'head' );
662
663 return $marker;
664 }
665
666 /**
667 * Create a new style tag and add it to the DOM.
668 *
669 * @private
670 * @param {string} text CSS text
671 * @param {HTMLElement|jQuery} [nextnode=document.head] The element where the style tag should be
672 * inserted before. Otherwise it will be appended to `<head>`.
673 * @return {HTMLElement} Reference to the created `<style>` element.
674 */
675 function newStyleTag( text, nextnode ) {
676 var s = document.createElement( 'style' );
677 // Insert into document before setting cssText (bug 33305)
678 if ( nextnode ) {
679 // Must be inserted with native insertBefore, not $.fn.before.
680 // When using jQuery to insert it, like $nextnode.before( s ),
681 // then IE6 will throw "Access is denied" when trying to append
682 // to .cssText later. Some kind of weird security measure.
683 // http://stackoverflow.com/q/12586482/319266
684 // Works: jsfiddle.net/zJzMy/1
685 // Fails: jsfiddle.net/uJTQz
686 // Works again: http://jsfiddle.net/Azr4w/ (diff: the next 3 lines)
687 if ( nextnode.jquery ) {
688 nextnode = nextnode.get( 0 );
689 }
690 nextnode.parentNode.insertBefore( s, nextnode );
691 } else {
692 document.getElementsByTagName( 'head' )[0].appendChild( s );
693 }
694 if ( s.styleSheet ) {
695 // IE
696 s.styleSheet.cssText = text;
697 } else {
698 // Other browsers.
699 // (Safari sometimes borks on non-string values,
700 // play safe by casting to a string, just in case.)
701 s.appendChild( document.createTextNode( String( text ) ) );
702 }
703 return s;
704 }
705
706 /**
707 * Checks whether it is safe to add this css to a stylesheet.
708 *
709 * @private
710 * @param {string} cssText
711 * @return {boolean} False if a new one must be created.
712 */
713 function canExpandStylesheetWith( cssText ) {
714 // Makes sure that cssText containing `@import`
715 // rules will end up in a new stylesheet (as those only work when
716 // placed at the start of a stylesheet; bug 35562).
717 return cssText.indexOf( '@import' ) === -1;
718 }
719
720 /**
721 * Add a bit of CSS text to the current browser page.
722 *
723 * The CSS will be appended to an existing ResourceLoader-created `<style>` tag
724 * or create a new one based on whether the given `cssText` is safe for extension.
725 *
726 * @param {string} [cssText=cssBuffer] If called without cssText,
727 * the internal buffer will be inserted instead.
728 * @param {Function} [callback]
729 */
730 function addEmbeddedCSS( cssText, callback ) {
731 var $style, styleEl;
732
733 if ( callback ) {
734 cssCallbacks.add( callback );
735 }
736
737 // Yield once before inserting the <style> tag. There are likely
738 // more calls coming up which we can combine this way.
739 // Appending a stylesheet and waiting for the browser to repaint
740 // is fairly expensive, this reduces it (bug 45810)
741 if ( cssText ) {
742 // Be careful not to extend the buffer with css that needs a new stylesheet
743 if ( !cssBuffer || canExpandStylesheetWith( cssText ) ) {
744 // Linebreak for somewhat distinguishable sections
745 // (the rl-cachekey comment separating each)
746 cssBuffer += '\n' + cssText;
747 // TODO: Use requestAnimationFrame in the future which will
748 // perform even better by not injecting styles while the browser
749 // is paiting.
750 setTimeout( function () {
751 // Can't pass addEmbeddedCSS to setTimeout directly because Firefox
752 // (below version 13) has the non-standard behaviour of passing a
753 // numerical "lateness" value as first argument to this callback
754 // http://benalman.com/news/2009/07/the-mysterious-firefox-settime/
755 addEmbeddedCSS();
756 } );
757 return;
758 }
759
760 // This is a delayed call and we got a buffer still
761 } else if ( cssBuffer ) {
762 cssText = cssBuffer;
763 cssBuffer = '';
764 } else {
765 // This is a delayed call, but buffer is already cleared by
766 // another delayed call.
767 return;
768 }
769
770 // By default, always create a new <style>. Appending text to a <style>
771 // tag is bad as it means the contents have to be re-parsed (bug 45810).
772 //
773 // Except, of course, in IE 9 and below. In there we default to re-using and
774 // appending to a <style> tag due to the IE stylesheet limit (bug 31676).
775 if ( 'documentMode' in document && document.documentMode <= 9 ) {
776
777 $style = getMarker().prev();
778 // Verify that the the element before Marker actually is a
779 // <style> tag and one that came from ResourceLoader
780 // (not some other style tag or even a `<meta>` or `<script>`).
781 if ( $style.data( 'ResourceLoaderDynamicStyleTag' ) === true ) {
782 // There's already a dynamic <style> tag present and
783 // canExpandStylesheetWith() gave a green light to append more to it.
784 styleEl = $style.get( 0 );
785 if ( styleEl.styleSheet ) {
786 try {
787 styleEl.styleSheet.cssText += cssText; // IE
788 } catch ( e ) {
789 log( 'Stylesheet error', e );
790 }
791 } else {
792 styleEl.appendChild( document.createTextNode( String( cssText ) ) );
793 }
794 cssCallbacks.fire().empty();
795 return;
796 }
797 }
798
799 $( newStyleTag( cssText, getMarker() ) ).data( 'ResourceLoaderDynamicStyleTag', true );
800
801 cssCallbacks.fire().empty();
802 }
803
804 /**
805 * Generates an ISO8601 "basic" string from a UNIX timestamp
806 * @private
807 */
808 function formatVersionNumber( timestamp ) {
809 var d = new Date();
810 function pad( a, b, c ) {
811 return [a < 10 ? '0' + a : a, b < 10 ? '0' + b : b, c < 10 ? '0' + c : c].join( '' );
812 }
813 d.setTime( timestamp * 1000 );
814 return [
815 pad( d.getUTCFullYear(), d.getUTCMonth() + 1, d.getUTCDate() ), 'T',
816 pad( d.getUTCHours(), d.getUTCMinutes(), d.getUTCSeconds() ), 'Z'
817 ].join( '' );
818 }
819
820 /**
821 * Resolves dependencies and detects circular references.
822 *
823 * @private
824 * @param {string} module Name of the top-level module whose dependencies shall be
825 * resolved and sorted.
826 * @param {Array} resolved Returns a topological sort of the given module and its
827 * dependencies, such that later modules depend on earlier modules. The array
828 * contains the module names. If the array contains already some module names,
829 * this function appends its result to the pre-existing array.
830 * @param {Object} [unresolved] Hash used to track the current dependency
831 * chain; used to report loops in the dependency graph.
832 * @throws {Error} If any unregistered module or a dependency loop is encountered
833 */
834 function sortDependencies( module, resolved, unresolved ) {
835 var n, deps, len, skip;
836
837 if ( registry[module] === undefined ) {
838 throw new Error( 'Unknown dependency: ' + module );
839 }
840
841 if ( registry[module].skip !== null ) {
842 /*jshint evil:true */
843 skip = new Function( registry[module].skip );
844 registry[module].skip = null;
845 if ( skip() ) {
846 registry[module].dependencies = [];
847 registry[module].state = 'ready';
848 handlePending( module );
849 return;
850 }
851 }
852
853 // Resolves dynamic loader function and replaces it with its own results
854 if ( $.isFunction( registry[module].dependencies ) ) {
855 registry[module].dependencies = registry[module].dependencies();
856 // Ensures the module's dependencies are always in an array
857 if ( typeof registry[module].dependencies !== 'object' ) {
858 registry[module].dependencies = [registry[module].dependencies];
859 }
860 }
861 if ( $.inArray( module, resolved ) !== -1 ) {
862 // Module already resolved; nothing to do.
863 return;
864 }
865 // unresolved is optional, supply it if not passed in
866 if ( !unresolved ) {
867 unresolved = {};
868 }
869 // Tracks down dependencies
870 deps = registry[module].dependencies;
871 len = deps.length;
872 for ( n = 0; n < len; n += 1 ) {
873 if ( $.inArray( deps[n], resolved ) === -1 ) {
874 if ( unresolved[deps[n]] ) {
875 throw new Error(
876 'Circular reference detected: ' + module +
877 ' -> ' + deps[n]
878 );
879 }
880
881 // Add to unresolved
882 unresolved[module] = true;
883 sortDependencies( deps[n], resolved, unresolved );
884 delete unresolved[module];
885 }
886 }
887 resolved[resolved.length] = module;
888 }
889
890 /**
891 * Gets a list of module names that a module depends on in their proper dependency
892 * order.
893 *
894 * @private
895 * @param {string} module Module name or array of string module names
896 * @return {Array} list of dependencies, including 'module'.
897 * @throws {Error} If circular reference is detected
898 */
899 function resolve( module ) {
900 var m, resolved;
901
902 // Allow calling with an array of module names
903 if ( $.isArray( module ) ) {
904 resolved = [];
905 for ( m = 0; m < module.length; m += 1 ) {
906 sortDependencies( module[m], resolved );
907 }
908 return resolved;
909 }
910
911 if ( typeof module === 'string' ) {
912 resolved = [];
913 sortDependencies( module, resolved );
914 return resolved;
915 }
916
917 throw new Error( 'Invalid module argument: ' + module );
918 }
919
920 /**
921 * Narrows a list of module names down to those matching a specific
922 * state (see comment on top of this scope for a list of valid states).
923 * One can also filter for 'unregistered', which will return the
924 * modules names that don't have a registry entry.
925 *
926 * @private
927 * @param {string|string[]} states Module states to filter by
928 * @param {Array} [modules] List of module names to filter (optional, by default the entire
929 * registry is used)
930 * @return {Array} List of filtered module names
931 */
932 function filter( states, modules ) {
933 var list, module, s, m;
934
935 // Allow states to be given as a string
936 if ( typeof states === 'string' ) {
937 states = [states];
938 }
939 // If called without a list of modules, build and use a list of all modules
940 list = [];
941 if ( modules === undefined ) {
942 modules = [];
943 for ( module in registry ) {
944 modules[modules.length] = module;
945 }
946 }
947 // Build a list of modules which are in one of the specified states
948 for ( s = 0; s < states.length; s += 1 ) {
949 for ( m = 0; m < modules.length; m += 1 ) {
950 if ( registry[modules[m]] === undefined ) {
951 // Module does not exist
952 if ( states[s] === 'unregistered' ) {
953 // OK, undefined
954 list[list.length] = modules[m];
955 }
956 } else {
957 // Module exists, check state
958 if ( registry[modules[m]].state === states[s] ) {
959 // OK, correct state
960 list[list.length] = modules[m];
961 }
962 }
963 }
964 }
965 return list;
966 }
967
968 /**
969 * Determine whether all dependencies are in state 'ready', which means we may
970 * execute the module or job now.
971 *
972 * @private
973 * @param {Array} dependencies Dependencies (module names) to be checked.
974 * @return {boolean} True if all dependencies are in state 'ready', false otherwise
975 */
976 function allReady( dependencies ) {
977 return filter( 'ready', dependencies ).length === dependencies.length;
978 }
979
980 /**
981 * A module has entered state 'ready', 'error', or 'missing'. Automatically update pending jobs
982 * and modules that depend upon this module. if the given module failed, propagate the 'error'
983 * state up the dependency tree; otherwise, execute all jobs/modules that now have all their
984 * dependencies satisfied. On jobs depending on a failed module, run the error callback, if any.
985 *
986 * @private
987 * @param {string} module Name of module that entered one of the states 'ready', 'error', or 'missing'.
988 */
989 function handlePending( module ) {
990 var j, job, hasErrors, m, stateChange;
991
992 // Modules.
993 if ( $.inArray( registry[module].state, ['error', 'missing'] ) !== -1 ) {
994 // If the current module failed, mark all dependent modules also as failed.
995 // Iterate until steady-state to propagate the error state upwards in the
996 // dependency tree.
997 do {
998 stateChange = false;
999 for ( m in registry ) {
1000 if ( $.inArray( registry[m].state, ['error', 'missing'] ) === -1 ) {
1001 if ( filter( ['error', 'missing'], registry[m].dependencies ).length > 0 ) {
1002 registry[m].state = 'error';
1003 stateChange = true;
1004 }
1005 }
1006 }
1007 } while ( stateChange );
1008 }
1009
1010 // Execute all jobs whose dependencies are either all satisfied or contain at least one failed module.
1011 for ( j = 0; j < jobs.length; j += 1 ) {
1012 hasErrors = filter( ['error', 'missing'], jobs[j].dependencies ).length > 0;
1013 if ( hasErrors || allReady( jobs[j].dependencies ) ) {
1014 // All dependencies satisfied, or some have errors
1015 job = jobs[j];
1016 jobs.splice( j, 1 );
1017 j -= 1;
1018 try {
1019 if ( hasErrors ) {
1020 if ( $.isFunction( job.error ) ) {
1021 job.error( new Error( 'Module ' + module + ' has failed dependencies' ), [module] );
1022 }
1023 } else {
1024 if ( $.isFunction( job.ready ) ) {
1025 job.ready();
1026 }
1027 }
1028 } catch ( e ) {
1029 // A user-defined callback raised an exception.
1030 // Swallow it to protect our state machine!
1031 log( 'Exception thrown by user callback', e );
1032 }
1033 }
1034 }
1035
1036 if ( registry[module].state === 'ready' ) {
1037 // The current module became 'ready'. Set it in the module store, and recursively execute all
1038 // dependent modules that are loaded and now have all dependencies satisfied.
1039 mw.loader.store.set( module, registry[module] );
1040 for ( m in registry ) {
1041 if ( registry[m].state === 'loaded' && allReady( registry[m].dependencies ) ) {
1042 execute( m );
1043 }
1044 }
1045 }
1046 }
1047
1048 /**
1049 * Adds a script tag to the DOM, either using document.write or low-level DOM manipulation,
1050 * depending on whether document-ready has occurred yet and whether we are in async mode.
1051 *
1052 * @private
1053 * @param {string} src URL to script, will be used as the src attribute in the script tag
1054 * @param {Function} [callback] Callback which will be run when the script is done
1055 * @param {boolean} [async=false] Whether to load modules asynchronously.
1056 * Ignored (and defaulted to `true`) if the document-ready event has already occurred.
1057 */
1058 function addScript( src, callback, async ) {
1059 // Using isReady directly instead of storing it locally from a $().ready callback (bug 31895)
1060 if ( $.isReady || async ) {
1061 $.ajax( {
1062 url: src,
1063 dataType: 'script',
1064 // Force jQuery behaviour to be for crossDomain. Otherwise jQuery would use
1065 // XHR for a same domain request instead of <script>, which changes the request
1066 // headers (potentially missing a cache hit), and reduces caching in general
1067 // since browsers cache XHR much less (if at all). And XHR means we retreive
1068 // text, so we'd need to $.globalEval, which then messes up line numbers.
1069 crossDomain: true,
1070 cache: true,
1071 async: true
1072 } ).always( function () {
1073 if ( callback ) {
1074 callback();
1075 }
1076 } );
1077 } else {
1078 /*jshint evil:true */
1079 document.write( mw.html.element( 'script', { 'src': src }, '' ) );
1080 if ( callback ) {
1081 // Document.write is synchronous, so this is called when it's done.
1082 // FIXME: That's a lie. doc.write isn't actually synchronous.
1083 callback();
1084 }
1085 }
1086 }
1087
1088 /**
1089 * Executes a loaded module, making it ready to use
1090 *
1091 * @private
1092 * @param {string} module Module name to execute
1093 */
1094 function execute( module ) {
1095 var key, value, media, i, urls, cssHandle, checkCssHandles,
1096 cssHandlesRegistered = false;
1097
1098 if ( registry[module] === undefined ) {
1099 throw new Error( 'Module has not been registered yet: ' + module );
1100 } else if ( registry[module].state === 'registered' ) {
1101 throw new Error( 'Module has not been requested from the server yet: ' + module );
1102 } else if ( registry[module].state === 'loading' ) {
1103 throw new Error( 'Module has not completed loading yet: ' + module );
1104 } else if ( registry[module].state === 'ready' ) {
1105 throw new Error( 'Module has already been executed: ' + module );
1106 }
1107
1108 /**
1109 * Define loop-function here for efficiency
1110 * and to avoid re-using badly scoped variables.
1111 * @ignore
1112 */
1113 function addLink( media, url ) {
1114 var el = document.createElement( 'link' );
1115 // For IE: Insert in document *before* setting href
1116 getMarker().before( el );
1117 el.rel = 'stylesheet';
1118 if ( media && media !== 'all' ) {
1119 el.media = media;
1120 }
1121 // If you end up here from an IE exception "SCRIPT: Invalid property value.",
1122 // see #addEmbeddedCSS, bug 31676, and bug 47277 for details.
1123 el.href = url;
1124 }
1125
1126 function runScript() {
1127 var script, markModuleReady, nestedAddScript;
1128 try {
1129 script = registry[module].script;
1130 markModuleReady = function () {
1131 registry[module].state = 'ready';
1132 handlePending( module );
1133 };
1134 nestedAddScript = function ( arr, callback, async, i ) {
1135 // Recursively call addScript() in its own callback
1136 // for each element of arr.
1137 if ( i >= arr.length ) {
1138 // We're at the end of the array
1139 callback();
1140 return;
1141 }
1142
1143 addScript( arr[i], function () {
1144 nestedAddScript( arr, callback, async, i + 1 );
1145 }, async );
1146 };
1147
1148 if ( $.isArray( script ) ) {
1149 nestedAddScript( script, markModuleReady, registry[module].async, 0 );
1150 } else if ( $.isFunction( script ) ) {
1151 registry[module].state = 'ready';
1152 // Pass jQuery twice so that the signature of the closure which wraps
1153 // the script can bind both '$' and 'jQuery'.
1154 script( $, $ );
1155 handlePending( module );
1156 }
1157 } catch ( e ) {
1158 // This needs to NOT use mw.log because these errors are common in production mode
1159 // and not in debug mode, such as when a symbol that should be global isn't exported
1160 log( 'Exception thrown by ' + module, e );
1161 registry[module].state = 'error';
1162 handlePending( module );
1163 }
1164 }
1165
1166 // This used to be inside runScript, but since that is now fired asychronously
1167 // (after CSS is loaded) we need to set it here right away. It is crucial that
1168 // when execute() is called this is set synchronously, otherwise modules will get
1169 // executed multiple times as the registry will state that it isn't loading yet.
1170 registry[module].state = 'loading';
1171
1172 // Add localizations to message system
1173 if ( $.isPlainObject( registry[module].messages ) ) {
1174 mw.messages.set( registry[module].messages );
1175 }
1176
1177 if ( $.isReady || registry[module].async ) {
1178 // Make sure we don't run the scripts until all (potentially asynchronous)
1179 // stylesheet insertions have completed.
1180 ( function () {
1181 var pending = 0;
1182 checkCssHandles = function () {
1183 // cssHandlesRegistered ensures we don't take off too soon, e.g. when
1184 // one of the cssHandles is fired while we're still creating more handles.
1185 if ( cssHandlesRegistered && pending === 0 && runScript ) {
1186 runScript();
1187 runScript = undefined; // Revoke
1188 }
1189 };
1190 cssHandle = function () {
1191 var check = checkCssHandles;
1192 pending++;
1193 return function () {
1194 if (check) {
1195 pending--;
1196 check();
1197 check = undefined; // Revoke
1198 }
1199 };
1200 };
1201 }() );
1202 } else {
1203 // We are in blocking mode, and so we can't afford to wait for CSS
1204 cssHandle = function () {};
1205 // Run immediately
1206 checkCssHandles = runScript;
1207 }
1208
1209 // Process styles (see also mw.loader.implement)
1210 // * back-compat: { <media>: css }
1211 // * back-compat: { <media>: [url, ..] }
1212 // * { "css": [css, ..] }
1213 // * { "url": { <media>: [url, ..] } }
1214 if ( $.isPlainObject( registry[module].style ) ) {
1215 for ( key in registry[module].style ) {
1216 value = registry[module].style[key];
1217 media = undefined;
1218
1219 if ( key !== 'url' && key !== 'css' ) {
1220 // Backwards compatibility, key is a media-type
1221 if ( typeof value === 'string' ) {
1222 // back-compat: { <media>: css }
1223 // Ignore 'media' because it isn't supported (nor was it used).
1224 // Strings are pre-wrapped in "@media". The media-type was just ""
1225 // (because it had to be set to something).
1226 // This is one of the reasons why this format is no longer used.
1227 addEmbeddedCSS( value, cssHandle() );
1228 } else {
1229 // back-compat: { <media>: [url, ..] }
1230 media = key;
1231 key = 'bc-url';
1232 }
1233 }
1234
1235 // Array of css strings in key 'css',
1236 // or back-compat array of urls from media-type
1237 if ( $.isArray( value ) ) {
1238 for ( i = 0; i < value.length; i += 1 ) {
1239 if ( key === 'bc-url' ) {
1240 // back-compat: { <media>: [url, ..] }
1241 addLink( media, value[i] );
1242 } else if ( key === 'css' ) {
1243 // { "css": [css, ..] }
1244 addEmbeddedCSS( value[i], cssHandle() );
1245 }
1246 }
1247 // Not an array, but a regular object
1248 // Array of urls inside media-type key
1249 } else if ( typeof value === 'object' ) {
1250 // { "url": { <media>: [url, ..] } }
1251 for ( media in value ) {
1252 urls = value[media];
1253 for ( i = 0; i < urls.length; i += 1 ) {
1254 addLink( media, urls[i] );
1255 }
1256 }
1257 }
1258 }
1259 }
1260
1261 // Kick off.
1262 cssHandlesRegistered = true;
1263 checkCssHandles();
1264 }
1265
1266 /**
1267 * Adds a dependencies to the queue with optional callbacks to be run
1268 * when the dependencies are ready or fail
1269 *
1270 * @private
1271 * @param {string|string[]} dependencies Module name or array of string module names
1272 * @param {Function} [ready] Callback to execute when all dependencies are ready
1273 * @param {Function} [error] Callback to execute when any dependency fails
1274 * @param {boolean} [async=false] Whether to load modules asynchronously.
1275 * Ignored (and defaulted to `true`) if the document-ready event has already occurred.
1276 */
1277 function request( dependencies, ready, error, async ) {
1278 var n;
1279
1280 // Allow calling by single module name
1281 if ( typeof dependencies === 'string' ) {
1282 dependencies = [dependencies];
1283 }
1284
1285 // Add ready and error callbacks if they were given
1286 if ( ready !== undefined || error !== undefined ) {
1287 jobs[jobs.length] = {
1288 'dependencies': filter(
1289 ['registered', 'loading', 'loaded'],
1290 dependencies
1291 ),
1292 'ready': ready,
1293 'error': error
1294 };
1295 }
1296
1297 // Queue up any dependencies that are registered
1298 dependencies = filter( ['registered'], dependencies );
1299 for ( n = 0; n < dependencies.length; n += 1 ) {
1300 if ( $.inArray( dependencies[n], queue ) === -1 ) {
1301 queue[queue.length] = dependencies[n];
1302 if ( async ) {
1303 // Mark this module as async in the registry
1304 registry[dependencies[n]].async = true;
1305 }
1306 }
1307 }
1308
1309 // Work the queue
1310 mw.loader.work();
1311 }
1312
1313 function sortQuery( o ) {
1314 var sorted = {}, key, a = [];
1315 for ( key in o ) {
1316 if ( hasOwn.call( o, key ) ) {
1317 a.push( key );
1318 }
1319 }
1320 a.sort();
1321 for ( key = 0; key < a.length; key += 1 ) {
1322 sorted[a[key]] = o[a[key]];
1323 }
1324 return sorted;
1325 }
1326
1327 /**
1328 * Converts a module map of the form { foo: [ 'bar', 'baz' ], bar: [ 'baz, 'quux' ] }
1329 * to a query string of the form foo.bar,baz|bar.baz,quux
1330 * @private
1331 */
1332 function buildModulesString( moduleMap ) {
1333 var arr = [], p, prefix;
1334 for ( prefix in moduleMap ) {
1335 p = prefix === '' ? '' : prefix + '.';
1336 arr.push( p + moduleMap[prefix].join( ',' ) );
1337 }
1338 return arr.join( '|' );
1339 }
1340
1341 /**
1342 * Asynchronously append a script tag to the end of the body
1343 * that invokes load.php
1344 * @private
1345 * @param {Object} moduleMap Module map, see #buildModulesString
1346 * @param {Object} currReqBase Object with other parameters (other than 'modules') to use in the request
1347 * @param {string} sourceLoadScript URL of load.php
1348 * @param {boolean} async Whether to load modules asynchronously.
1349 * Ignored (and defaulted to `true`) if the document-ready event has already occurred.
1350 */
1351 function doRequest( moduleMap, currReqBase, sourceLoadScript, async ) {
1352 var request = $.extend(
1353 { modules: buildModulesString( moduleMap ) },
1354 currReqBase
1355 );
1356 request = sortQuery( request );
1357 // Append &* to avoid triggering the IE6 extension check
1358 addScript( sourceLoadScript + '?' + $.param( request ) + '&*', null, async );
1359 }
1360
1361 /* Public Members */
1362 return {
1363 /**
1364 * The module registry is exposed as an aid for debugging and inspecting page
1365 * state; it is not a public interface for modifying the registry.
1366 *
1367 * @see #registry
1368 * @property
1369 * @private
1370 */
1371 moduleRegistry: registry,
1372
1373 /**
1374 * @inheritdoc #newStyleTag
1375 * @method
1376 */
1377 addStyleTag: newStyleTag,
1378
1379 /**
1380 * Batch-request queued dependencies from the server.
1381 */
1382 work: function () {
1383 var reqBase, splits, maxQueryLength, q, b, bSource, bGroup, bSourceGroup,
1384 source, concatSource, origBatch, group, g, i, modules, maxVersion, sourceLoadScript,
1385 currReqBase, currReqBaseLength, moduleMap, l,
1386 lastDotIndex, prefix, suffix, bytesAdded, async;
1387
1388 // Build a list of request parameters common to all requests.
1389 reqBase = {
1390 skin: mw.config.get( 'skin' ),
1391 lang: mw.config.get( 'wgUserLanguage' ),
1392 debug: mw.config.get( 'debug' )
1393 };
1394 // Split module batch by source and by group.
1395 splits = {};
1396 maxQueryLength = mw.config.get( 'wgResourceLoaderMaxQueryLength', -1 );
1397
1398 // Appends a list of modules from the queue to the batch
1399 for ( q = 0; q < queue.length; q += 1 ) {
1400 // Only request modules which are registered
1401 if ( registry[queue[q]] !== undefined && registry[queue[q]].state === 'registered' ) {
1402 // Prevent duplicate entries
1403 if ( $.inArray( queue[q], batch ) === -1 ) {
1404 batch[batch.length] = queue[q];
1405 // Mark registered modules as loading
1406 registry[queue[q]].state = 'loading';
1407 }
1408 }
1409 }
1410
1411 mw.loader.store.init();
1412 if ( mw.loader.store.enabled ) {
1413 concatSource = [];
1414 origBatch = batch;
1415 batch = $.grep( batch, function ( module ) {
1416 var source = mw.loader.store.get( module );
1417 if ( source ) {
1418 concatSource.push( source );
1419 return false;
1420 }
1421 return true;
1422 } );
1423 try {
1424 $.globalEval( concatSource.join( ';' ) );
1425 } catch ( err ) {
1426 // Not good, the cached mw.loader.implement calls failed! This should
1427 // never happen, barring ResourceLoader bugs, browser bugs and PEBKACs.
1428 // Depending on how corrupt the string is, it is likely that some
1429 // modules' implement() succeeded while the ones after the error will
1430 // never run and leave their modules in the 'loading' state forever.
1431
1432 // Since this is an error not caused by an individual module but by
1433 // something that infected the implement call itself, don't take any
1434 // risks and clear everything in this cache.
1435 mw.loader.store.clear();
1436 // Re-add the ones still pending back to the batch and let the server
1437 // repopulate these modules to the cache.
1438 // This means that at most one module will be useless (the one that had
1439 // the error) instead of all of them.
1440 log( 'Error while evaluating data from mw.loader.store', err );
1441 origBatch = $.grep( origBatch, function ( module ) {
1442 return registry[module].state === 'loading';
1443 } );
1444 batch = batch.concat( origBatch );
1445 }
1446 }
1447
1448 // Early exit if there's nothing to load...
1449 if ( !batch.length ) {
1450 return;
1451 }
1452
1453 // The queue has been processed into the batch, clear up the queue.
1454 queue = [];
1455
1456 // Always order modules alphabetically to help reduce cache
1457 // misses for otherwise identical content.
1458 batch.sort();
1459
1460 // Split batch by source and by group.
1461 for ( b = 0; b < batch.length; b += 1 ) {
1462 bSource = registry[batch[b]].source;
1463 bGroup = registry[batch[b]].group;
1464 if ( splits[bSource] === undefined ) {
1465 splits[bSource] = {};
1466 }
1467 if ( splits[bSource][bGroup] === undefined ) {
1468 splits[bSource][bGroup] = [];
1469 }
1470 bSourceGroup = splits[bSource][bGroup];
1471 bSourceGroup[bSourceGroup.length] = batch[b];
1472 }
1473
1474 // Clear the batch - this MUST happen before we append any
1475 // script elements to the body or it's possible that a script
1476 // will be locally cached, instantly load, and work the batch
1477 // again, all before we've cleared it causing each request to
1478 // include modules which are already loaded.
1479 batch = [];
1480
1481 for ( source in splits ) {
1482
1483 sourceLoadScript = sources[source].loadScript;
1484
1485 for ( group in splits[source] ) {
1486
1487 // Cache access to currently selected list of
1488 // modules for this group from this source.
1489 modules = splits[source][group];
1490
1491 // Calculate the highest timestamp
1492 maxVersion = 0;
1493 for ( g = 0; g < modules.length; g += 1 ) {
1494 if ( registry[modules[g]].version > maxVersion ) {
1495 maxVersion = registry[modules[g]].version;
1496 }
1497 }
1498
1499 currReqBase = $.extend( { version: formatVersionNumber( maxVersion ) }, reqBase );
1500 // For user modules append a user name to the request.
1501 if ( group === 'user' && mw.config.get( 'wgUserName' ) !== null ) {
1502 currReqBase.user = mw.config.get( 'wgUserName' );
1503 }
1504 currReqBaseLength = $.param( currReqBase ).length;
1505 async = true;
1506 // We may need to split up the request to honor the query string length limit,
1507 // so build it piece by piece.
1508 l = currReqBaseLength + 9; // '&modules='.length == 9
1509
1510 moduleMap = {}; // { prefix: [ suffixes ] }
1511
1512 for ( i = 0; i < modules.length; i += 1 ) {
1513 // Determine how many bytes this module would add to the query string
1514 lastDotIndex = modules[i].lastIndexOf( '.' );
1515 // Note that these substr() calls work even if lastDotIndex == -1
1516 prefix = modules[i].substr( 0, lastDotIndex );
1517 suffix = modules[i].substr( lastDotIndex + 1 );
1518 bytesAdded = moduleMap[prefix] !== undefined
1519 ? suffix.length + 3 // '%2C'.length == 3
1520 : modules[i].length + 3; // '%7C'.length == 3
1521
1522 // If the request would become too long, create a new one,
1523 // but don't create empty requests
1524 if ( maxQueryLength > 0 && !$.isEmptyObject( moduleMap ) && l + bytesAdded > maxQueryLength ) {
1525 // This request would become too long, create a new one
1526 // and fire off the old one
1527 doRequest( moduleMap, currReqBase, sourceLoadScript, async );
1528 moduleMap = {};
1529 async = true;
1530 l = currReqBaseLength + 9;
1531 }
1532 if ( moduleMap[prefix] === undefined ) {
1533 moduleMap[prefix] = [];
1534 }
1535 moduleMap[prefix].push( suffix );
1536 if ( !registry[modules[i]].async ) {
1537 // If this module is blocking, make the entire request blocking
1538 // This is slightly suboptimal, but in practice mixing of blocking
1539 // and async modules will only occur in debug mode.
1540 async = false;
1541 }
1542 l += bytesAdded;
1543 }
1544 // If there's anything left in moduleMap, request that too
1545 if ( !$.isEmptyObject( moduleMap ) ) {
1546 doRequest( moduleMap, currReqBase, sourceLoadScript, async );
1547 }
1548 }
1549 }
1550 },
1551
1552 /**
1553 * Register a source.
1554 *
1555 * The #work method will use this information to split up requests by source.
1556 *
1557 * mw.loader.addSource( 'mediawikiwiki', { loadScript: '//www.mediawiki.org/w/load.php' } );
1558 *
1559 * @param {string} id Short string representing a source wiki, used internally for
1560 * registered modules to indicate where they should be loaded from (usually lowercase a-z).
1561 * @param {Object} props
1562 * @param {string} props.loadScript Url to the load.php entry point of the source wiki.
1563 * @return {boolean}
1564 */
1565 addSource: function ( id, props ) {
1566 var source;
1567 // Allow multiple additions
1568 if ( typeof id === 'object' ) {
1569 for ( source in id ) {
1570 mw.loader.addSource( source, id[source] );
1571 }
1572 return true;
1573 }
1574
1575 if ( sources[id] !== undefined ) {
1576 throw new Error( 'source already registered: ' + id );
1577 }
1578
1579 sources[id] = props;
1580
1581 return true;
1582 },
1583
1584 /**
1585 * Register a module, letting the system know about it and its
1586 * properties. Startup modules contain calls to this function.
1587 *
1588 * @param {string} module Module name
1589 * @param {number} version Module version number as a timestamp (falls backs to 0)
1590 * @param {string|Array|Function} dependencies One string or array of strings of module
1591 * names on which this module depends, or a function that returns that array.
1592 * @param {string} [group=null] Group which the module is in
1593 * @param {string} [source='local'] Name of the source
1594 * @param {string} [skip=null] Script body of the skip function
1595 */
1596 register: function ( module, version, dependencies, group, source, skip ) {
1597 var m;
1598 // Allow multiple registration
1599 if ( typeof module === 'object' ) {
1600 for ( m = 0; m < module.length; m += 1 ) {
1601 // module is an array of module names
1602 if ( typeof module[m] === 'string' ) {
1603 mw.loader.register( module[m] );
1604 // module is an array of arrays
1605 } else if ( typeof module[m] === 'object' ) {
1606 mw.loader.register.apply( mw.loader, module[m] );
1607 }
1608 }
1609 return;
1610 }
1611 // Validate input
1612 if ( typeof module !== 'string' ) {
1613 throw new Error( 'module must be a string, not a ' + typeof module );
1614 }
1615 if ( registry[module] !== undefined ) {
1616 throw new Error( 'module already registered: ' + module );
1617 }
1618 // List the module as registered
1619 registry[module] = {
1620 version: version !== undefined ? parseInt( version, 10 ) : 0,
1621 dependencies: [],
1622 group: typeof group === 'string' ? group : null,
1623 source: typeof source === 'string' ? source : 'local',
1624 state: 'registered',
1625 skip: typeof skip === 'string' ? skip : null
1626 };
1627 if ( typeof dependencies === 'string' ) {
1628 // Allow dependencies to be given as a single module name
1629 registry[module].dependencies = [ dependencies ];
1630 } else if ( typeof dependencies === 'object' || $.isFunction( dependencies ) ) {
1631 // Allow dependencies to be given as an array of module names
1632 // or a function which returns an array
1633 registry[module].dependencies = dependencies;
1634 }
1635 },
1636
1637 /**
1638 * Implement a module given the components that make up the module.
1639 *
1640 * When #load or #using requests one or more modules, the server
1641 * response contain calls to this function.
1642 *
1643 * All arguments are required.
1644 *
1645 * @param {string} module Name of module
1646 * @param {Function|Array} script Function with module code or Array of URLs to
1647 * be used as the src attribute of a new `<script>` tag.
1648 * @param {Object} style Should follow one of the following patterns:
1649 *
1650 * { "css": [css, ..] }
1651 * { "url": { <media>: [url, ..] } }
1652 *
1653 * And for backwards compatibility (needs to be supported forever due to caching):
1654 *
1655 * { <media>: css }
1656 * { <media>: [url, ..] }
1657 *
1658 * The reason css strings are not concatenated anymore is bug 31676. We now check
1659 * whether it's safe to extend the stylesheet (see #canExpandStylesheetWith).
1660 *
1661 * @param {Object} msgs List of key/value pairs to be added to mw#messages.
1662 */
1663 implement: function ( module, script, style, msgs ) {
1664 // Validate input
1665 if ( typeof module !== 'string' ) {
1666 throw new Error( 'module must be a string, not a ' + typeof module );
1667 }
1668 if ( !$.isFunction( script ) && !$.isArray( script ) ) {
1669 throw new Error( 'script must be a function or an array, not a ' + typeof script );
1670 }
1671 if ( !$.isPlainObject( style ) ) {
1672 throw new Error( 'style must be an object, not a ' + typeof style );
1673 }
1674 if ( !$.isPlainObject( msgs ) ) {
1675 throw new Error( 'msgs must be an object, not a ' + typeof msgs );
1676 }
1677 // Automatically register module
1678 if ( registry[module] === undefined ) {
1679 mw.loader.register( module );
1680 }
1681 // Check for duplicate implementation
1682 if ( registry[module] !== undefined && registry[module].script !== undefined ) {
1683 throw new Error( 'module already implemented: ' + module );
1684 }
1685 // Attach components
1686 registry[module].script = script;
1687 registry[module].style = style;
1688 registry[module].messages = msgs;
1689 // The module may already have been marked as erroneous
1690 if ( $.inArray( registry[module].state, ['error', 'missing'] ) === -1 ) {
1691 registry[module].state = 'loaded';
1692 if ( allReady( registry[module].dependencies ) ) {
1693 execute( module );
1694 }
1695 }
1696 },
1697
1698 /**
1699 * Execute a function as soon as one or more required modules are ready.
1700 *
1701 * If the required modules are already loaded, the function will be
1702 * executed immediately and the modules will not be reloaded.
1703 *
1704 * Example of inline dependency on OOjs:
1705 *
1706 * mw.loader.using( 'oojs', function () {
1707 * OO.compare( [ 1 ], [ 1 ] );
1708 * } );
1709 *
1710 * @param {string|Array} dependencies Module name or array of modules names the callback
1711 * dependends on to be ready before executing
1712 * @param {Function} [ready] Callback to execute when all dependencies are ready
1713 * @param {Function} [error] Callback to execute if one or more dependencies failed
1714 * @return {jQuery.Promise}
1715 */
1716 using: function ( dependencies, ready, error ) {
1717 var deferred = $.Deferred();
1718
1719 // Allow calling with a single dependency as a string
1720 if ( typeof dependencies === 'string' ) {
1721 dependencies = [ dependencies ];
1722 } else if ( !$.isArray( dependencies ) ) {
1723 // Invalid input
1724 throw new Error( 'Dependencies must be a string or an array' );
1725 }
1726
1727 if ( ready ) {
1728 deferred.done( ready );
1729 }
1730 if ( error ) {
1731 deferred.fail( error );
1732 }
1733
1734 // Resolve entire dependency map
1735 dependencies = resolve( dependencies );
1736 if ( allReady( dependencies ) ) {
1737 // Run ready immediately
1738 deferred.resolve();
1739 } else if ( filter( ['error', 'missing'], dependencies ).length ) {
1740 // Execute error immediately if any dependencies have errors
1741 deferred.reject(
1742 new Error( 'One or more dependencies failed to load' ),
1743 dependencies
1744 );
1745 } else {
1746 // Not all dependencies are ready: queue up a request
1747 request( dependencies, deferred.resolve, deferred.reject );
1748 }
1749
1750 return deferred.promise();
1751 },
1752
1753 /**
1754 * Load an external script or one or more modules.
1755 *
1756 * @param {string|Array} modules Either the name of a module, array of modules,
1757 * or a URL of an external script or style
1758 * @param {string} [type='text/javascript'] mime-type to use if calling with a URL of an
1759 * external script or style; acceptable values are "text/css" and
1760 * "text/javascript"; if no type is provided, text/javascript is assumed.
1761 * @param {boolean} [async] Whether to load modules asynchronously.
1762 * Ignored (and defaulted to `true`) if the document-ready event has already occurred.
1763 * Defaults to `true` if loading a URL, `false` otherwise.
1764 */
1765 load: function ( modules, type, async ) {
1766 var filtered, m, module, l;
1767
1768 // Validate input
1769 if ( typeof modules !== 'object' && typeof modules !== 'string' ) {
1770 throw new Error( 'modules must be a string or an array, not a ' + typeof modules );
1771 }
1772 // Allow calling with an external url or single dependency as a string
1773 if ( typeof modules === 'string' ) {
1774 // Support adding arbitrary external scripts
1775 if ( /^(https?:)?\/\//.test( modules ) ) {
1776 if ( async === undefined ) {
1777 // Assume async for bug 34542
1778 async = true;
1779 }
1780 if ( type === 'text/css' ) {
1781 // IE7-8 throws security warnings when inserting a <link> tag
1782 // with a protocol-relative URL set though attributes (instead of
1783 // properties) - when on HTTPS. See also bug 41331.
1784 l = document.createElement( 'link' );
1785 l.rel = 'stylesheet';
1786 l.href = modules;
1787 $( 'head' ).append( l );
1788 return;
1789 }
1790 if ( type === 'text/javascript' || type === undefined ) {
1791 addScript( modules, null, async );
1792 return;
1793 }
1794 // Unknown type
1795 throw new Error( 'invalid type for external url, must be text/css or text/javascript. not ' + type );
1796 }
1797 // Called with single module
1798 modules = [ modules ];
1799 }
1800
1801 // Filter out undefined modules, otherwise resolve() will throw
1802 // an exception for trying to load an undefined module.
1803 // Undefined modules are acceptable here in load(), because load() takes
1804 // an array of unrelated modules, whereas the modules passed to
1805 // using() are related and must all be loaded.
1806 for ( filtered = [], m = 0; m < modules.length; m += 1 ) {
1807 module = registry[modules[m]];
1808 if ( module !== undefined ) {
1809 if ( $.inArray( module.state, ['error', 'missing'] ) === -1 ) {
1810 filtered[filtered.length] = modules[m];
1811 }
1812 }
1813 }
1814
1815 if ( filtered.length === 0 ) {
1816 return;
1817 }
1818 // Resolve entire dependency map
1819 filtered = resolve( filtered );
1820 // If all modules are ready, nothing to be done
1821 if ( allReady( filtered ) ) {
1822 return;
1823 }
1824 // If any modules have errors: also quit.
1825 if ( filter( ['error', 'missing'], filtered ).length ) {
1826 return;
1827 }
1828 // Since some modules are not yet ready, queue up a request.
1829 request( filtered, undefined, undefined, async );
1830 },
1831
1832 /**
1833 * Change the state of one or more modules.
1834 *
1835 * @param {string|Object} module Module name or object of module name/state pairs
1836 * @param {string} state State name
1837 */
1838 state: function ( module, state ) {
1839 var m;
1840
1841 if ( typeof module === 'object' ) {
1842 for ( m in module ) {
1843 mw.loader.state( m, module[m] );
1844 }
1845 return;
1846 }
1847 if ( registry[module] === undefined ) {
1848 mw.loader.register( module );
1849 }
1850 if ( $.inArray( state, ['ready', 'error', 'missing'] ) !== -1
1851 && registry[module].state !== state ) {
1852 // Make sure pending modules depending on this one get executed if their
1853 // dependencies are now fulfilled!
1854 registry[module].state = state;
1855 handlePending( module );
1856 } else {
1857 registry[module].state = state;
1858 }
1859 },
1860
1861 /**
1862 * Get the version of a module.
1863 *
1864 * @param {string} module Name of module to get version for
1865 * @return {string|null} The version, or null if the module (or its version) is not
1866 * in the registry.
1867 */
1868 getVersion: function ( module ) {
1869 if ( registry[module] !== undefined && registry[module].version !== undefined ) {
1870 return formatVersionNumber( registry[module].version );
1871 }
1872 return null;
1873 },
1874
1875 /**
1876 * Get the state of a module.
1877 *
1878 * @param {string} module Name of module to get state for
1879 */
1880 getState: function ( module ) {
1881 if ( registry[module] !== undefined && registry[module].state !== undefined ) {
1882 return registry[module].state;
1883 }
1884 return null;
1885 },
1886
1887 /**
1888 * Get the names of all registered modules.
1889 *
1890 * @return {Array}
1891 */
1892 getModuleNames: function () {
1893 return $.map( registry, function ( i, key ) {
1894 return key;
1895 } );
1896 },
1897
1898 /**
1899 * @inheritdoc mw.inspect#runReports
1900 * @method
1901 */
1902 inspect: function () {
1903 var args = slice.call( arguments );
1904 mw.loader.using( 'mediawiki.inspect', function () {
1905 mw.inspect.runReports.apply( mw.inspect, args );
1906 } );
1907 },
1908
1909 /**
1910 * On browsers that implement the localStorage API, the module store serves as a
1911 * smart complement to the browser cache. Unlike the browser cache, the module store
1912 * can slice a concatenated response from ResourceLoader into its constituent
1913 * modules and cache each of them separately, using each module's versioning scheme
1914 * to determine when the cache should be invalidated.
1915 *
1916 * @singleton
1917 * @class mw.loader.store
1918 */
1919 store: {
1920 // Whether the store is in use on this page.
1921 enabled: null,
1922
1923 // The contents of the store, mapping '[module name]@[version]' keys
1924 // to module implementations.
1925 items: {},
1926
1927 // Cache hit stats
1928 stats: { hits: 0, misses: 0, expired: 0 },
1929
1930 /**
1931 * Construct a JSON-serializable object representing the content of the store.
1932 * @return {Object} Module store contents.
1933 */
1934 toJSON: function () {
1935 return { items: mw.loader.store.items, vary: mw.loader.store.getVary() };
1936 },
1937
1938 /**
1939 * Get the localStorage key for the entire module store. The key references
1940 * $wgDBname to prevent clashes between wikis which share a common host.
1941 *
1942 * @return {string} localStorage item key
1943 */
1944 getStoreKey: function () {
1945 return 'MediaWikiModuleStore:' + mw.config.get( 'wgDBname' );
1946 },
1947
1948 /**
1949 * Get a string key on which to vary the module cache.
1950 * @return {string} String of concatenated vary conditions.
1951 */
1952 getVary: function () {
1953 return [
1954 mw.config.get( 'skin' ),
1955 mw.config.get( 'wgResourceLoaderStorageVersion' ),
1956 mw.config.get( 'wgUserLanguage' )
1957 ].join( ':' );
1958 },
1959
1960 /**
1961 * Get a string key for a specific module. The key format is '[name]@[version]'.
1962 *
1963 * @param {string} module Module name
1964 * @return {string|null} Module key or null if module does not exist
1965 */
1966 getModuleKey: function ( module ) {
1967 return typeof registry[module] === 'object' ?
1968 ( module + '@' + registry[module].version ) : null;
1969 },
1970
1971 /**
1972 * Initialize the store.
1973 *
1974 * Retrieves store from localStorage and (if successfully retrieved) decoding
1975 * the stored JSON value to a plain object.
1976 *
1977 * The try / catch block is used for JSON & localStorage feature detection.
1978 * See the in-line documentation for Modernizr's localStorage feature detection
1979 * code for a full account of why we need a try / catch:
1980 * <https://github.com/Modernizr/Modernizr/blob/v2.7.1/modernizr.js#L771-L796>.
1981 */
1982 init: function () {
1983 var raw, data;
1984
1985 if ( mw.loader.store.enabled !== null ) {
1986 // Init already ran
1987 return;
1988 }
1989
1990 if ( !mw.config.get( 'wgResourceLoaderStorageEnabled' ) || mw.config.get( 'debug' ) ) {
1991 // Disabled by configuration, or because debug mode is set
1992 mw.loader.store.enabled = false;
1993 return;
1994 }
1995
1996 try {
1997 raw = localStorage.getItem( mw.loader.store.getStoreKey() );
1998 // If we get here, localStorage is available; mark enabled
1999 mw.loader.store.enabled = true;
2000 data = JSON.parse( raw );
2001 if ( data && typeof data.items === 'object' && data.vary === mw.loader.store.getVary() ) {
2002 mw.loader.store.items = data.items;
2003 return;
2004 }
2005 } catch ( e ) {
2006 log( 'Storage error', e );
2007 }
2008
2009 if ( raw === undefined ) {
2010 // localStorage failed; disable store
2011 mw.loader.store.enabled = false;
2012 } else {
2013 mw.loader.store.update();
2014 }
2015 },
2016
2017 /**
2018 * Retrieve a module from the store and update cache hit stats.
2019 *
2020 * @param {string} module Module name
2021 * @return {string|boolean} Module implementation or false if unavailable
2022 */
2023 get: function ( module ) {
2024 var key;
2025
2026 if ( !mw.loader.store.enabled ) {
2027 return false;
2028 }
2029
2030 key = mw.loader.store.getModuleKey( module );
2031 if ( key in mw.loader.store.items ) {
2032 mw.loader.store.stats.hits++;
2033 return mw.loader.store.items[key];
2034 }
2035 mw.loader.store.stats.misses++;
2036 return false;
2037 },
2038
2039 /**
2040 * Stringify a module and queue it for storage.
2041 *
2042 * @param {string} module Module name
2043 * @param {Object} descriptor The module's descriptor as set in the registry
2044 */
2045 set: function ( module, descriptor ) {
2046 var args, key;
2047
2048 if ( !mw.loader.store.enabled ) {
2049 return false;
2050 }
2051
2052 key = mw.loader.store.getModuleKey( module );
2053
2054 if (
2055 // Already stored a copy of this exact version
2056 key in mw.loader.store.items ||
2057 // Module failed to load
2058 descriptor.state !== 'ready' ||
2059 // Unversioned, private, or site-/user-specific
2060 ( !descriptor.version || $.inArray( descriptor.group, [ 'private', 'user', 'site' ] ) !== -1 ) ||
2061 // Partial descriptor
2062 $.inArray( undefined, [ descriptor.script, descriptor.style, descriptor.messages ] ) !== -1
2063 ) {
2064 // Decline to store
2065 return false;
2066 }
2067
2068 try {
2069 args = [
2070 JSON.stringify( module ),
2071 typeof descriptor.script === 'function' ?
2072 String( descriptor.script ) :
2073 JSON.stringify( descriptor.script ),
2074 JSON.stringify( descriptor.style ),
2075 JSON.stringify( descriptor.messages )
2076 ];
2077 // Attempted workaround for a possible Opera bug (bug 57567).
2078 // This regex should never match under sane conditions.
2079 if ( /^\s*\(/.test( args[1] ) ) {
2080 args[1] = 'function' + args[1];
2081 log( 'Detected malformed function stringification (bug 57567)' );
2082 }
2083 } catch ( e ) {
2084 log( 'Storage error', e );
2085 return;
2086 }
2087
2088 mw.loader.store.items[key] = 'mw.loader.implement(' + args.join( ',' ) + ');';
2089 mw.loader.store.update();
2090 },
2091
2092 /**
2093 * Iterate through the module store, removing any item that does not correspond
2094 * (in name and version) to an item in the module registry.
2095 */
2096 prune: function () {
2097 var key, module;
2098
2099 if ( !mw.loader.store.enabled ) {
2100 return false;
2101 }
2102
2103 for ( key in mw.loader.store.items ) {
2104 module = key.substring( 0, key.indexOf( '@' ) );
2105 if ( mw.loader.store.getModuleKey( module ) !== key ) {
2106 mw.loader.store.stats.expired++;
2107 delete mw.loader.store.items[key];
2108 }
2109 }
2110 },
2111
2112 /**
2113 * Clear the entire module store right now.
2114 */
2115 clear: function () {
2116 mw.loader.store.items = {};
2117 localStorage.removeItem( mw.loader.store.getStoreKey() );
2118 },
2119
2120 /**
2121 * Sync modules to localStorage.
2122 *
2123 * This function debounces localStorage updates. When called multiple times in
2124 * quick succession, the calls are coalesced into a single update operation.
2125 * This allows us to call #update without having to consider the module load
2126 * queue; the call to localStorage.setItem will be naturally deferred until the
2127 * page is quiescent.
2128 *
2129 * Because localStorage is shared by all pages with the same origin, if multiple
2130 * pages are loaded with different module sets, the possibility exists that
2131 * modules saved by one page will be clobbered by another. But the impact would
2132 * be minor and the problem would be corrected by subsequent page views.
2133 *
2134 * @method
2135 */
2136 update: ( function () {
2137 var timer;
2138
2139 function flush() {
2140 var data,
2141 key = mw.loader.store.getStoreKey();
2142
2143 if ( !mw.loader.store.enabled ) {
2144 return false;
2145 }
2146 mw.loader.store.prune();
2147 try {
2148 // Replacing the content of the module store might fail if the new
2149 // contents would exceed the browser's localStorage size limit. To
2150 // avoid clogging the browser with stale data, always remove the old
2151 // value before attempting to set the new one.
2152 localStorage.removeItem( key );
2153 data = JSON.stringify( mw.loader.store );
2154 localStorage.setItem( key, data );
2155 } catch ( e ) {
2156 log( 'Storage error', e );
2157 }
2158 }
2159
2160 return function () {
2161 clearTimeout( timer );
2162 timer = setTimeout( flush, 2000 );
2163 };
2164 }() )
2165 }
2166 };
2167 }() ),
2168
2169 /**
2170 * HTML construction helper functions
2171 *
2172 * @example
2173 *
2174 * var Html, output;
2175 *
2176 * Html = mw.html;
2177 * output = Html.element( 'div', {}, new Html.Raw(
2178 * Html.element( 'img', { src: '<' } )
2179 * ) );
2180 * mw.log( output ); // <div><img src="&lt;"/></div>
2181 *
2182 * @class mw.html
2183 * @singleton
2184 */
2185 html: ( function () {
2186 function escapeCallback( s ) {
2187 switch ( s ) {
2188 case '\'':
2189 return '&#039;';
2190 case '"':
2191 return '&quot;';
2192 case '<':
2193 return '&lt;';
2194 case '>':
2195 return '&gt;';
2196 case '&':
2197 return '&amp;';
2198 }
2199 }
2200
2201 return {
2202 /**
2203 * Escape a string for HTML.
2204 *
2205 * Converts special characters to HTML entities.
2206 *
2207 * mw.html.escape( '< > \' & "' );
2208 * // Returns &lt; &gt; &#039; &amp; &quot;
2209 *
2210 * @param {string} s The string to escape
2211 * @return {string} HTML
2212 */
2213 escape: function ( s ) {
2214 return s.replace( /['"<>&]/g, escapeCallback );
2215 },
2216
2217 /**
2218 * Create an HTML element string, with safe escaping.
2219 *
2220 * @param {string} name The tag name.
2221 * @param {Object} attrs An object with members mapping element names to values
2222 * @param {Mixed} contents The contents of the element. May be either:
2223 *
2224 * - string: The string is escaped.
2225 * - null or undefined: The short closing form is used, e.g. `<br/>`.
2226 * - this.Raw: The value attribute is included without escaping.
2227 * - this.Cdata: The value attribute is included, and an exception is
2228 * thrown if it contains an illegal ETAGO delimiter.
2229 * See <http://www.w3.org/TR/1999/REC-html401-19991224/appendix/notes.html#h-B.3.2>.
2230 * @return {string} HTML
2231 */
2232 element: function ( name, attrs, contents ) {
2233 var v, attrName, s = '<' + name;
2234
2235 for ( attrName in attrs ) {
2236 v = attrs[attrName];
2237 // Convert name=true, to name=name
2238 if ( v === true ) {
2239 v = attrName;
2240 // Skip name=false
2241 } else if ( v === false ) {
2242 continue;
2243 }
2244 s += ' ' + attrName + '="' + this.escape( String( v ) ) + '"';
2245 }
2246 if ( contents === undefined || contents === null ) {
2247 // Self close tag
2248 s += '/>';
2249 return s;
2250 }
2251 // Regular open tag
2252 s += '>';
2253 switch ( typeof contents ) {
2254 case 'string':
2255 // Escaped
2256 s += this.escape( contents );
2257 break;
2258 case 'number':
2259 case 'boolean':
2260 // Convert to string
2261 s += String( contents );
2262 break;
2263 default:
2264 if ( contents instanceof this.Raw ) {
2265 // Raw HTML inclusion
2266 s += contents.value;
2267 } else if ( contents instanceof this.Cdata ) {
2268 // CDATA
2269 if ( /<\/[a-zA-z]/.test( contents.value ) ) {
2270 throw new Error( 'mw.html.element: Illegal end tag found in CDATA' );
2271 }
2272 s += contents.value;
2273 } else {
2274 throw new Error( 'mw.html.element: Invalid type of contents' );
2275 }
2276 }
2277 s += '</' + name + '>';
2278 return s;
2279 },
2280
2281 /**
2282 * Wrapper object for raw HTML passed to mw.html.element().
2283 * @class mw.html.Raw
2284 */
2285 Raw: function ( value ) {
2286 this.value = value;
2287 },
2288
2289 /**
2290 * Wrapper object for CDATA element contents passed to mw.html.element()
2291 * @class mw.html.Cdata
2292 */
2293 Cdata: function ( value ) {
2294 this.value = value;
2295 }
2296 };
2297 }() ),
2298
2299 // Skeleton user object. mediawiki.user.js extends this
2300 user: {
2301 options: new Map(),
2302 tokens: new Map()
2303 },
2304
2305 /**
2306 * Registry and firing of events.
2307 *
2308 * MediaWiki has various interface components that are extended, enhanced
2309 * or manipulated in some other way by extensions, gadgets and even
2310 * in core itself.
2311 *
2312 * This framework helps streamlining the timing of when these other
2313 * code paths fire their plugins (instead of using document-ready,
2314 * which can and should be limited to firing only once).
2315 *
2316 * Features like navigating to other wiki pages, previewing an edit
2317 * and editing itself – without a refresh – can then retrigger these
2318 * hooks accordingly to ensure everything still works as expected.
2319 *
2320 * Example usage:
2321 *
2322 * mw.hook( 'wikipage.content' ).add( fn ).remove( fn );
2323 * mw.hook( 'wikipage.content' ).fire( $content );
2324 *
2325 * Handlers can be added and fired for arbitrary event names at any time. The same
2326 * event can be fired multiple times. The last run of an event is memorized
2327 * (similar to `$(document).ready` and `$.Deferred().done`).
2328 * This means if an event is fired, and a handler added afterwards, the added
2329 * function will be fired right away with the last given event data.
2330 *
2331 * Like Deferreds and Promises, the mw.hook object is both detachable and chainable.
2332 * Thus allowing flexible use and optimal maintainability and authority control.
2333 * You can pass around the `add` and/or `fire` method to another piece of code
2334 * without it having to know the event name (or `mw.hook` for that matter).
2335 *
2336 * var h = mw.hook( 'bar.ready' );
2337 * new mw.Foo( .. ).fetch( { callback: h.fire } );
2338 *
2339 * Note: Events are documented with an underscore instead of a dot in the event
2340 * name due to jsduck not supporting dots in that position.
2341 *
2342 * @class mw.hook
2343 */
2344 hook: ( function () {
2345 var lists = {};
2346
2347 /**
2348 * Create an instance of mw.hook.
2349 *
2350 * @method hook
2351 * @member mw
2352 * @param {string} name Name of hook.
2353 * @return {mw.hook}
2354 */
2355 return function ( name ) {
2356 var list = hasOwn.call( lists, name ) ?
2357 lists[name] :
2358 lists[name] = $.Callbacks( 'memory' );
2359
2360 return {
2361 /**
2362 * Register a hook handler
2363 * @param {Function...} handler Function to bind.
2364 * @chainable
2365 */
2366 add: list.add,
2367
2368 /**
2369 * Unregister a hook handler
2370 * @param {Function...} handler Function to unbind.
2371 * @chainable
2372 */
2373 remove: list.remove,
2374
2375 /**
2376 * Run a hook.
2377 * @param {Mixed...} data
2378 * @chainable
2379 */
2380 fire: function () {
2381 return list.fireWith.call( this, null, slice.call( arguments ) );
2382 }
2383 };
2384 };
2385 }() )
2386 };
2387
2388 // Alias $j to jQuery for backwards compatibility
2389 // @deprecated since 1.23 Use $ or jQuery instead
2390 mw.log.deprecate( window, '$j', $, 'Use $ or jQuery instead.' );
2391
2392 // Attach to window and globally alias
2393 window.mw = window.mediaWiki = mw;
2394
2395 // Auto-register from pre-loaded startup scripts
2396 if ( $.isFunction( window.startUp ) ) {
2397 window.startUp();
2398 window.startUp = undefined;
2399 }
2400
2401 }( jQuery ) );
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