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Module storage: randomly choose between Function and $.globalEval
[lhc/web/wiklou.git] / resources / mediawiki / mediawiki.js
1 /**
2 * Base library for MediaWiki.
3 *
4 * @class mw
5 * @alternateClassName mediaWiki
6 * @singleton
7 */
8
9 var mw = ( function ( $, undefined ) {
10 'use strict';
11
12 /* Private Members */
13
14 var hasOwn = Object.prototype.hasOwnProperty,
15 slice = Array.prototype.slice;
16
17 /**
18 * Log a message to window.console, if possible. Useful to force logging of some
19 * errors that are otherwise hard to detect (I.e., this logs also in production mode).
20 * Gets console references in each invocation, so that delayed debugging tools work
21 * fine. No need for optimization here, which would only result in losing logs.
22 *
23 * @private
24 * @method log_
25 * @param {string} msg text for the log entry.
26 * @param {Error} [e]
27 */
28 function log( msg, e ) {
29 var console = window.console;
30 if ( console && console.log ) {
31 console.log( msg );
32 // If we have an exception object, log it through .error() to trigger
33 // proper stacktraces in browsers that support it. There are no (known)
34 // browsers that don't support .error(), that do support .log() and
35 // have useful exception handling through .log().
36 if ( e && console.error ) {
37 console.error( String( e ), e );
38 }
39 }
40 }
41
42 /* Object constructors */
43
44 /**
45 * Creates an object that can be read from or written to from prototype functions
46 * that allow both single and multiple variables at once.
47 *
48 * @example
49 *
50 * var addies, wanted, results;
51 *
52 * // Create your address book
53 * addies = new mw.Map();
54 *
55 * // This data could be coming from an external source (eg. API/AJAX)
56 * addies.set( {
57 * 'John Doe' : '10 Wall Street, New York, USA',
58 * 'Jane Jackson' : '21 Oxford St, London, UK',
59 * 'Dominique van Halen' : 'Kalverstraat 7, Amsterdam, NL'
60 * } );
61 *
62 * wanted = ['Dominique van Halen', 'George Johnson', 'Jane Jackson'];
63 *
64 * // You can detect missing keys first
65 * if ( !addies.exists( wanted ) ) {
66 * // One or more are missing (in this case: "George Johnson")
67 * mw.log( 'One or more names were not found in your address book' );
68 * }
69 *
70 * // Or just let it give you what it can
71 * results = addies.get( wanted, 'Middle of Nowhere, Alaska, US' );
72 * mw.log( results['Jane Jackson'] ); // "21 Oxford St, London, UK"
73 * mw.log( results['George Johnson'] ); // "Middle of Nowhere, Alaska, US"
74 *
75 * @class mw.Map
76 *
77 * @constructor
78 * @param {Object|boolean} [values] Value-bearing object to map, or boolean
79 * true to map over the global object. Defaults to an empty object.
80 */
81 function Map( values ) {
82 this.values = values === true ? window : ( values || {} );
83 return this;
84 }
85
86 Map.prototype = {
87 /**
88 * Get the value of one or multiple a keys.
89 *
90 * If called with no arguments, all values will be returned.
91 *
92 * @param {string|Array} selection String key or array of keys to get values for.
93 * @param {Mixed} [fallback] Value to use in case key(s) do not exist.
94 * @return mixed If selection was a string returns the value or null,
95 * If selection was an array, returns an object of key/values (value is null if not found),
96 * If selection was not passed or invalid, will return the 'values' object member (be careful as
97 * objects are always passed by reference in JavaScript!).
98 * @return {string|Object|null} Values as a string or object, null if invalid/inexistant.
99 */
100 get: function ( selection, fallback ) {
101 var results, i;
102 // If we only do this in the `return` block, it'll fail for the
103 // call to get() from the mutli-selection block.
104 fallback = arguments.length > 1 ? fallback : null;
105
106 if ( $.isArray( selection ) ) {
107 selection = slice.call( selection );
108 results = {};
109 for ( i = 0; i < selection.length; i++ ) {
110 results[selection[i]] = this.get( selection[i], fallback );
111 }
112 return results;
113 }
114
115 if ( typeof selection === 'string' ) {
116 if ( !hasOwn.call( this.values, selection ) ) {
117 return fallback;
118 }
119 return this.values[selection];
120 }
121
122 if ( selection === undefined ) {
123 return this.values;
124 }
125
126 // invalid selection key
127 return null;
128 },
129
130 /**
131 * Sets one or multiple key/value pairs.
132 *
133 * @param {string|Object} selection String key to set value for, or object mapping keys to values.
134 * @param {Mixed} [value] Value to set (optional, only in use when key is a string)
135 * @return {Boolean} This returns true on success, false on failure.
136 */
137 set: function ( selection, value ) {
138 var s;
139
140 if ( $.isPlainObject( selection ) ) {
141 for ( s in selection ) {
142 this.values[s] = selection[s];
143 }
144 return true;
145 }
146 if ( typeof selection === 'string' && arguments.length > 1 ) {
147 this.values[selection] = value;
148 return true;
149 }
150 return false;
151 },
152
153 /**
154 * Checks if one or multiple keys exist.
155 *
156 * @param {Mixed} selection String key or array of keys to check
157 * @return {boolean} Existence of key(s)
158 */
159 exists: function ( selection ) {
160 var s;
161
162 if ( $.isArray( selection ) ) {
163 for ( s = 0; s < selection.length; s++ ) {
164 if ( typeof selection[s] !== 'string' || !hasOwn.call( this.values, selection[s] ) ) {
165 return false;
166 }
167 }
168 return true;
169 }
170 return typeof selection === 'string' && hasOwn.call( this.values, selection );
171 }
172 };
173
174 /**
175 * Object constructor for messages.
176 *
177 * Similar to the Message class in MediaWiki PHP.
178 *
179 * Format defaults to 'text'.
180 *
181 * @class mw.Message
182 *
183 * @constructor
184 * @param {mw.Map} map Message storage
185 * @param {string} key
186 * @param {Array} [parameters]
187 */
188 function Message( map, key, parameters ) {
189 this.format = 'text';
190 this.map = map;
191 this.key = key;
192 this.parameters = parameters === undefined ? [] : slice.call( parameters );
193 return this;
194 }
195
196 Message.prototype = {
197 /**
198 * Simple message parser, does $N replacement and nothing else.
199 *
200 * This may be overridden to provide a more complex message parser.
201 *
202 * The primary override is in mediawiki.jqueryMsg.
203 *
204 * This function will not be called for nonexistent messages.
205 */
206 parser: function () {
207 var parameters = this.parameters;
208 return this.map.get( this.key ).replace( /\$(\d+)/g, function ( str, match ) {
209 var index = parseInt( match, 10 ) - 1;
210 return parameters[index] !== undefined ? parameters[index] : '$' + match;
211 } );
212 },
213
214 /**
215 * Appends (does not replace) parameters for replacement to the .parameters property.
216 *
217 * @param {Array} parameters
218 * @chainable
219 */
220 params: function ( parameters ) {
221 var i;
222 for ( i = 0; i < parameters.length; i += 1 ) {
223 this.parameters.push( parameters[i] );
224 }
225 return this;
226 },
227
228 /**
229 * Converts message object to its string form based on the state of format.
230 *
231 * @return {string} Message as a string in the current form or `<key>` if key does not exist.
232 */
233 toString: function () {
234 var text;
235
236 if ( !this.exists() ) {
237 // Use <key> as text if key does not exist
238 if ( this.format === 'escaped' || this.format === 'parse' ) {
239 // format 'escaped' and 'parse' need to have the brackets and key html escaped
240 return mw.html.escape( '<' + this.key + '>' );
241 }
242 return '<' + this.key + '>';
243 }
244
245 if ( this.format === 'plain' || this.format === 'text' || this.format === 'parse' ) {
246 text = this.parser();
247 }
248
249 if ( this.format === 'escaped' ) {
250 text = this.parser();
251 text = mw.html.escape( text );
252 }
253
254 return text;
255 },
256
257 /**
258 * Changes format to 'parse' and converts message to string
259 *
260 * If jqueryMsg is loaded, this parses the message text from wikitext
261 * (where supported) to HTML
262 *
263 * Otherwise, it is equivalent to plain.
264 *
265 * @return {string} String form of parsed message
266 */
267 parse: function () {
268 this.format = 'parse';
269 return this.toString();
270 },
271
272 /**
273 * Changes format to 'plain' and converts message to string
274 *
275 * This substitutes parameters, but otherwise does not change the
276 * message text.
277 *
278 * @return {string} String form of plain message
279 */
280 plain: function () {
281 this.format = 'plain';
282 return this.toString();
283 },
284
285 /**
286 * Changes format to 'text' and converts message to string
287 *
288 * If jqueryMsg is loaded, {{-transformation is done where supported
289 * (such as {{plural:}}, {{gender:}}, {{int:}}).
290 *
291 * Otherwise, it is equivalent to plain.
292 */
293 text: function () {
294 this.format = 'text';
295 return this.toString();
296 },
297
298 /**
299 * Changes the format to 'escaped' and converts message to string
300 *
301 * This is equivalent to using the 'text' format (see text method), then
302 * HTML-escaping the output.
303 *
304 * @return {string} String form of html escaped message
305 */
306 escaped: function () {
307 this.format = 'escaped';
308 return this.toString();
309 },
310
311 /**
312 * Checks if message exists
313 *
314 * @see mw.Map#exists
315 * @return {boolean}
316 */
317 exists: function () {
318 return this.map.exists( this.key );
319 }
320 };
321
322 /**
323 * @class mw
324 */
325 return {
326 /* Public Members */
327
328 /**
329 * Dummy placeholder for {@link mw.log}
330 * @method
331 */
332 log: ( function () {
333 var log = function () {};
334 log.warn = function () {};
335 log.deprecate = function ( obj, key, val ) {
336 obj[key] = val;
337 };
338 return log;
339 }() ),
340
341 // Make the Map constructor publicly available.
342 Map: Map,
343
344 // Make the Message constructor publicly available.
345 Message: Message,
346
347 /**
348 * Map of configuration values
349 *
350 * Check out [the complete list of configuration values](https://www.mediawiki.org/wiki/Manual:Interface/JavaScript#mw.config)
351 * on MediaWiki.org.
352 *
353 * If `$wgLegacyJavaScriptGlobals` is true, this Map will put its values in the
354 * global window object.
355 *
356 * @property {mw.Map} config
357 */
358 // Dummy placeholder. Re-assigned in ResourceLoaderStartupModule with an instance of `mw.Map`.
359 config: null,
360
361 /**
362 * Empty object that plugins can be installed in.
363 * @property
364 */
365 libs: {},
366
367 /**
368 * Access container for deprecated functionality that can be moved from
369 * from their legacy location and attached to this object (e.g. a global
370 * function that is deprecated and as stop-gap can be exposed through here).
371 *
372 * This was reserved for future use but never ended up being used.
373 *
374 * @deprecated since 1.22: Let deprecated identifiers keep their original name
375 * and use mw.log#deprecate to create an access container for tracking.
376 * @property
377 */
378 legacy: {},
379
380 /**
381 * Localization system
382 * @property {mw.Map}
383 */
384 messages: new Map(),
385
386 /* Public Methods */
387
388 /**
389 * Get a message object.
390 *
391 * Similar to wfMessage() in MediaWiki PHP.
392 *
393 * @param {string} key Key of message to get
394 * @param {Mixed...} parameters Parameters for the $N replacements in messages.
395 * @return {mw.Message}
396 */
397 message: function ( key ) {
398 // Variadic arguments
399 var parameters = slice.call( arguments, 1 );
400 return new Message( mw.messages, key, parameters );
401 },
402
403 /**
404 * Get a message string using 'text' format.
405 *
406 * Similar to wfMsg() in MediaWiki PHP.
407 *
408 * @see mw.Message
409 * @param {string} key Key of message to get
410 * @param {Mixed...} parameters Parameters for the $N replacements in messages.
411 * @return {string}
412 */
413 msg: function () {
414 return mw.message.apply( mw.message, arguments ).toString();
415 },
416
417 /**
418 * Client-side module loader which integrates with the MediaWiki ResourceLoader
419 * @class mw.loader
420 * @singleton
421 */
422 loader: ( function () {
423
424 /* Private Members */
425
426 /**
427 * Mapping of registered modules
428 *
429 * The jquery module is pre-registered, because it must have already
430 * been provided for this object to have been built, and in debug mode
431 * jquery would have been provided through a unique loader request,
432 * making it impossible to hold back registration of jquery until after
433 * mediawiki.
434 *
435 * For exact details on support for script, style and messages, look at
436 * mw.loader.implement.
437 *
438 * Format:
439 * {
440 * 'moduleName': {
441 * 'version': ############## (unix timestamp),
442 * 'dependencies': ['required.foo', 'bar.also', ...], (or) function () {}
443 * 'group': 'somegroup', (or) null,
444 * 'source': 'local', 'someforeignwiki', (or) null
445 * 'state': 'registered', 'loaded', 'loading', 'ready', 'error' or 'missing'
446 * 'script': ...,
447 * 'style': ...,
448 * 'messages': { 'key': 'value' },
449 * }
450 * }
451 *
452 * @property
453 * @private
454 */
455 var registry = {},
456 //
457 // Mapping of sources, keyed by source-id, values are objects.
458 // Format:
459 // {
460 // 'sourceId': {
461 // 'loadScript': 'http://foo.bar/w/load.php'
462 // }
463 // }
464 //
465 sources = {},
466 // List of modules which will be loaded as when ready
467 batch = [],
468 // List of modules to be loaded
469 queue = [],
470 // List of callback functions waiting for modules to be ready to be called
471 jobs = [],
472 // Selector cache for the marker element. Use getMarker() to get/use the marker!
473 $marker = null,
474 // Buffer for addEmbeddedCSS.
475 cssBuffer = '',
476 // Callbacks for addEmbeddedCSS.
477 cssCallbacks = $.Callbacks();
478
479 /* Private methods */
480
481 function getMarker() {
482 // Cached ?
483 if ( $marker ) {
484 return $marker;
485 }
486
487 $marker = $( 'meta[name="ResourceLoaderDynamicStyles"]' );
488 if ( $marker.length ) {
489 return $marker;
490 }
491 mw.log( 'getMarker> No <meta name="ResourceLoaderDynamicStyles"> found, inserting dynamically.' );
492 $marker = $( '<meta>' ).attr( 'name', 'ResourceLoaderDynamicStyles' ).appendTo( 'head' );
493
494 return $marker;
495 }
496
497 /**
498 * Create a new style tag and add it to the DOM.
499 *
500 * @private
501 * @param {string} text CSS text
502 * @param {HTMLElement|jQuery} [nextnode=document.head] The element where the style tag should be
503 * inserted before. Otherwise it will be appended to `<head>`.
504 * @return {HTMLElement} Reference to the created `<style>` element.
505 */
506 function newStyleTag( text, nextnode ) {
507 var s = document.createElement( 'style' );
508 // Insert into document before setting cssText (bug 33305)
509 if ( nextnode ) {
510 // Must be inserted with native insertBefore, not $.fn.before.
511 // When using jQuery to insert it, like $nextnode.before( s ),
512 // then IE6 will throw "Access is denied" when trying to append
513 // to .cssText later. Some kind of weird security measure.
514 // http://stackoverflow.com/q/12586482/319266
515 // Works: jsfiddle.net/zJzMy/1
516 // Fails: jsfiddle.net/uJTQz
517 // Works again: http://jsfiddle.net/Azr4w/ (diff: the next 3 lines)
518 if ( nextnode.jquery ) {
519 nextnode = nextnode.get( 0 );
520 }
521 nextnode.parentNode.insertBefore( s, nextnode );
522 } else {
523 document.getElementsByTagName( 'head' )[0].appendChild( s );
524 }
525 if ( s.styleSheet ) {
526 // IE
527 s.styleSheet.cssText = text;
528 } else {
529 // Other browsers.
530 // (Safari sometimes borks on non-string values,
531 // play safe by casting to a string, just in case.)
532 s.appendChild( document.createTextNode( String( text ) ) );
533 }
534 return s;
535 }
536
537 /**
538 * Checks whether it is safe to add this css to a stylesheet.
539 *
540 * @private
541 * @param {string} cssText
542 * @return {boolean} False if a new one must be created.
543 */
544 function canExpandStylesheetWith( cssText ) {
545 // Makes sure that cssText containing `@import`
546 // rules will end up in a new stylesheet (as those only work when
547 // placed at the start of a stylesheet; bug 35562).
548 return cssText.indexOf( '@import' ) === -1;
549 }
550
551 /**
552 * Add a bit of CSS text to the current browser page.
553 *
554 * The CSS will be appended to an existing ResourceLoader-created `<style>` tag
555 * or create a new one based on whether the given `cssText` is safe for extension.
556 *
557 * @param {string} [cssText=cssBuffer] If called without cssText,
558 * the internal buffer will be inserted instead.
559 * @param {Function} [callback]
560 */
561 function addEmbeddedCSS( cssText, callback ) {
562 var $style, styleEl;
563
564 if ( callback ) {
565 cssCallbacks.add( callback );
566 }
567
568 // Yield once before inserting the <style> tag. There are likely
569 // more calls coming up which we can combine this way.
570 // Appending a stylesheet and waiting for the browser to repaint
571 // is fairly expensive, this reduces it (bug 45810)
572 if ( cssText ) {
573 // Be careful not to extend the buffer with css that needs a new stylesheet
574 if ( !cssBuffer || canExpandStylesheetWith( cssText ) ) {
575 // Linebreak for somewhat distinguishable sections
576 // (the rl-cachekey comment separating each)
577 cssBuffer += '\n' + cssText;
578 // TODO: Use requestAnimationFrame in the future which will
579 // perform even better by not injecting styles while the browser
580 // is paiting.
581 setTimeout( function () {
582 // Can't pass addEmbeddedCSS to setTimeout directly because Firefox
583 // (below version 13) has the non-standard behaviour of passing a
584 // numerical "lateness" value as first argument to this callback
585 // http://benalman.com/news/2009/07/the-mysterious-firefox-settime/
586 addEmbeddedCSS();
587 } );
588 return;
589 }
590
591 // This is a delayed call and we got a buffer still
592 } else if ( cssBuffer ) {
593 cssText = cssBuffer;
594 cssBuffer = '';
595 } else {
596 // This is a delayed call, but buffer is already cleared by
597 // another delayed call.
598 return;
599 }
600
601 // By default, always create a new <style>. Appending text
602 // to a <style> tag means the contents have to be re-parsed (bug 45810).
603 // Except, of course, in IE below 9, in there we default to
604 // re-using and appending to a <style> tag due to the
605 // IE stylesheet limit (bug 31676).
606 if ( 'documentMode' in document && document.documentMode <= 9 ) {
607
608 $style = getMarker().prev();
609 // Verify that the the element before Marker actually is a
610 // <style> tag and one that came from ResourceLoader
611 // (not some other style tag or even a `<meta>` or `<script>`).
612 if ( $style.data( 'ResourceLoaderDynamicStyleTag' ) === true ) {
613 // There's already a dynamic <style> tag present and
614 // canExpandStylesheetWith() gave a green light to append more to it.
615 styleEl = $style.get( 0 );
616 if ( styleEl.styleSheet ) {
617 try {
618 styleEl.styleSheet.cssText += cssText; // IE
619 } catch ( e ) {
620 log( 'addEmbeddedCSS fail', e );
621 }
622 } else {
623 styleEl.appendChild( document.createTextNode( String( cssText ) ) );
624 }
625 cssCallbacks.fire().empty();
626 return;
627 }
628 }
629
630 $( newStyleTag( cssText, getMarker() ) ).data( 'ResourceLoaderDynamicStyleTag', true );
631
632 cssCallbacks.fire().empty();
633 }
634
635 /**
636 * Generates an ISO8601 "basic" string from a UNIX timestamp
637 * @private
638 */
639 function formatVersionNumber( timestamp ) {
640 var d = new Date();
641 function pad( a, b, c ) {
642 return [a < 10 ? '0' + a : a, b < 10 ? '0' + b : b, c < 10 ? '0' + c : c].join( '' );
643 }
644 d.setTime( timestamp * 1000 );
645 return [
646 pad( d.getUTCFullYear(), d.getUTCMonth() + 1, d.getUTCDate() ), 'T',
647 pad( d.getUTCHours(), d.getUTCMinutes(), d.getUTCSeconds() ), 'Z'
648 ].join( '' );
649 }
650
651 /**
652 * Resolves dependencies and detects circular references.
653 *
654 * @private
655 * @param {string} module Name of the top-level module whose dependencies shall be
656 * resolved and sorted.
657 * @param {Array} resolved Returns a topological sort of the given module and its
658 * dependencies, such that later modules depend on earlier modules. The array
659 * contains the module names. If the array contains already some module names,
660 * this function appends its result to the pre-existing array.
661 * @param {Object} [unresolved] Hash used to track the current dependency
662 * chain; used to report loops in the dependency graph.
663 * @throws {Error} If any unregistered module or a dependency loop is encountered
664 */
665 function sortDependencies( module, resolved, unresolved ) {
666 var n, deps, len;
667
668 if ( registry[module] === undefined ) {
669 throw new Error( 'Unknown dependency: ' + module );
670 }
671 // Resolves dynamic loader function and replaces it with its own results
672 if ( $.isFunction( registry[module].dependencies ) ) {
673 registry[module].dependencies = registry[module].dependencies();
674 // Ensures the module's dependencies are always in an array
675 if ( typeof registry[module].dependencies !== 'object' ) {
676 registry[module].dependencies = [registry[module].dependencies];
677 }
678 }
679 if ( $.inArray( module, resolved ) !== -1 ) {
680 // Module already resolved; nothing to do.
681 return;
682 }
683 // unresolved is optional, supply it if not passed in
684 if ( !unresolved ) {
685 unresolved = {};
686 }
687 // Tracks down dependencies
688 deps = registry[module].dependencies;
689 len = deps.length;
690 for ( n = 0; n < len; n += 1 ) {
691 if ( $.inArray( deps[n], resolved ) === -1 ) {
692 if ( unresolved[deps[n]] ) {
693 throw new Error(
694 'Circular reference detected: ' + module +
695 ' -> ' + deps[n]
696 );
697 }
698
699 // Add to unresolved
700 unresolved[module] = true;
701 sortDependencies( deps[n], resolved, unresolved );
702 delete unresolved[module];
703 }
704 }
705 resolved[resolved.length] = module;
706 }
707
708 /**
709 * Gets a list of module names that a module depends on in their proper dependency
710 * order.
711 *
712 * @private
713 * @param {string} module Module name or array of string module names
714 * @return {Array} list of dependencies, including 'module'.
715 * @throws {Error} If circular reference is detected
716 */
717 function resolve( module ) {
718 var m, resolved;
719
720 // Allow calling with an array of module names
721 if ( $.isArray( module ) ) {
722 resolved = [];
723 for ( m = 0; m < module.length; m += 1 ) {
724 sortDependencies( module[m], resolved );
725 }
726 return resolved;
727 }
728
729 if ( typeof module === 'string' ) {
730 resolved = [];
731 sortDependencies( module, resolved );
732 return resolved;
733 }
734
735 throw new Error( 'Invalid module argument: ' + module );
736 }
737
738 /**
739 * Narrows a list of module names down to those matching a specific
740 * state (see comment on top of this scope for a list of valid states).
741 * One can also filter for 'unregistered', which will return the
742 * modules names that don't have a registry entry.
743 *
744 * @private
745 * @param {string|string[]} states Module states to filter by
746 * @param {Array} [modules] List of module names to filter (optional, by default the entire
747 * registry is used)
748 * @return {Array} List of filtered module names
749 */
750 function filter( states, modules ) {
751 var list, module, s, m;
752
753 // Allow states to be given as a string
754 if ( typeof states === 'string' ) {
755 states = [states];
756 }
757 // If called without a list of modules, build and use a list of all modules
758 list = [];
759 if ( modules === undefined ) {
760 modules = [];
761 for ( module in registry ) {
762 modules[modules.length] = module;
763 }
764 }
765 // Build a list of modules which are in one of the specified states
766 for ( s = 0; s < states.length; s += 1 ) {
767 for ( m = 0; m < modules.length; m += 1 ) {
768 if ( registry[modules[m]] === undefined ) {
769 // Module does not exist
770 if ( states[s] === 'unregistered' ) {
771 // OK, undefined
772 list[list.length] = modules[m];
773 }
774 } else {
775 // Module exists, check state
776 if ( registry[modules[m]].state === states[s] ) {
777 // OK, correct state
778 list[list.length] = modules[m];
779 }
780 }
781 }
782 }
783 return list;
784 }
785
786 /**
787 * Determine whether all dependencies are in state 'ready', which means we may
788 * execute the module or job now.
789 *
790 * @private
791 * @param {Array} dependencies Dependencies (module names) to be checked.
792 * @return {boolean} True if all dependencies are in state 'ready', false otherwise
793 */
794 function allReady( dependencies ) {
795 return filter( 'ready', dependencies ).length === dependencies.length;
796 }
797
798 /**
799 * A module has entered state 'ready', 'error', or 'missing'. Automatically update pending jobs
800 * and modules that depend upon this module. if the given module failed, propagate the 'error'
801 * state up the dependency tree; otherwise, execute all jobs/modules that now have all their
802 * dependencies satisfied. On jobs depending on a failed module, run the error callback, if any.
803 *
804 * @private
805 * @param {string} module Name of module that entered one of the states 'ready', 'error', or 'missing'.
806 */
807 function handlePending( module ) {
808 var j, job, hasErrors, m, stateChange;
809
810 // Modules.
811 if ( $.inArray( registry[module].state, ['error', 'missing'] ) !== -1 ) {
812 // If the current module failed, mark all dependent modules also as failed.
813 // Iterate until steady-state to propagate the error state upwards in the
814 // dependency tree.
815 do {
816 stateChange = false;
817 for ( m in registry ) {
818 if ( $.inArray( registry[m].state, ['error', 'missing'] ) === -1 ) {
819 if ( filter( ['error', 'missing'], registry[m].dependencies ).length > 0 ) {
820 registry[m].state = 'error';
821 stateChange = true;
822 }
823 }
824 }
825 } while ( stateChange );
826 }
827
828 // Execute all jobs whose dependencies are either all satisfied or contain at least one failed module.
829 for ( j = 0; j < jobs.length; j += 1 ) {
830 hasErrors = filter( ['error', 'missing'], jobs[j].dependencies ).length > 0;
831 if ( hasErrors || allReady( jobs[j].dependencies ) ) {
832 // All dependencies satisfied, or some have errors
833 job = jobs[j];
834 jobs.splice( j, 1 );
835 j -= 1;
836 try {
837 if ( hasErrors ) {
838 if ( $.isFunction( job.error ) ) {
839 job.error( new Error( 'Module ' + module + ' has failed dependencies' ), [module] );
840 }
841 } else {
842 if ( $.isFunction( job.ready ) ) {
843 job.ready();
844 }
845 }
846 } catch ( e ) {
847 // A user-defined callback raised an exception.
848 // Swallow it to protect our state machine!
849 log( 'Exception thrown by job.error', e );
850 }
851 }
852 }
853
854 if ( registry[module].state === 'ready' ) {
855 // The current module became 'ready'. Set it in the module store, and recursively execute all
856 // dependent modules that are loaded and now have all dependencies satisfied.
857 mw.loader.store.set( module, registry[module] );
858 for ( m in registry ) {
859 if ( registry[m].state === 'loaded' && allReady( registry[m].dependencies ) ) {
860 execute( m );
861 }
862 }
863 }
864 }
865
866 /**
867 * Adds a script tag to the DOM, either using document.write or low-level DOM manipulation,
868 * depending on whether document-ready has occurred yet and whether we are in async mode.
869 *
870 * @private
871 * @param {string} src URL to script, will be used as the src attribute in the script tag
872 * @param {Function} [callback] Callback which will be run when the script is done
873 */
874 function addScript( src, callback, async ) {
875 /*jshint evil:true */
876 var script, head, done;
877
878 // Using isReady directly instead of storing it locally from
879 // a $.fn.ready callback (bug 31895).
880 if ( $.isReady || async ) {
881 // Can't use jQuery.getScript because that only uses <script> for cross-domain,
882 // it uses XHR and eval for same-domain scripts, which we don't want because it
883 // messes up line numbers.
884 // The below is based on jQuery ([jquery@1.8.2]/src/ajax/script.js)
885
886 // IE-safe way of getting the <head>. document.head isn't supported
887 // in old IE, and doesn't work when in the <head>.
888 done = false;
889 head = document.getElementsByTagName( 'head' )[0] || document.body;
890
891 script = document.createElement( 'script' );
892 script.async = true;
893 script.src = src;
894 if ( $.isFunction( callback ) ) {
895 script.onload = script.onreadystatechange = function () {
896 if (
897 !done
898 && (
899 !script.readyState
900 || /loaded|complete/.test( script.readyState )
901 )
902 ) {
903 done = true;
904
905 // Handle memory leak in IE
906 script.onload = script.onreadystatechange = null;
907
908 // Detach the element from the document
909 if ( script.parentNode ) {
910 script.parentNode.removeChild( script );
911 }
912
913 // Dereference the element from javascript
914 script = undefined;
915
916 callback();
917 }
918 };
919 }
920
921 if ( window.opera ) {
922 // Appending to the <head> blocks rendering completely in Opera,
923 // so append to the <body> after document ready. This means the
924 // scripts only start loading after the document has been rendered,
925 // but so be it. Opera users don't deserve faster web pages if their
926 // browser makes it impossible.
927 $( function () {
928 document.body.appendChild( script );
929 } );
930 } else {
931 head.appendChild( script );
932 }
933 } else {
934 document.write( mw.html.element( 'script', { 'src': src }, '' ) );
935 if ( $.isFunction( callback ) ) {
936 // Document.write is synchronous, so this is called when it's done
937 // FIXME: that's a lie. doc.write isn't actually synchronous
938 callback();
939 }
940 }
941 }
942
943 /**
944 * Executes a loaded module, making it ready to use
945 *
946 * @private
947 * @param {string} module Module name to execute
948 */
949 function execute( module ) {
950 var key, value, media, i, urls, cssHandle, checkCssHandles,
951 cssHandlesRegistered = false;
952
953 if ( registry[module] === undefined ) {
954 throw new Error( 'Module has not been registered yet: ' + module );
955 } else if ( registry[module].state === 'registered' ) {
956 throw new Error( 'Module has not been requested from the server yet: ' + module );
957 } else if ( registry[module].state === 'loading' ) {
958 throw new Error( 'Module has not completed loading yet: ' + module );
959 } else if ( registry[module].state === 'ready' ) {
960 throw new Error( 'Module has already been executed: ' + module );
961 }
962
963 /**
964 * Define loop-function here for efficiency
965 * and to avoid re-using badly scoped variables.
966 * @ignore
967 */
968 function addLink( media, url ) {
969 var el = document.createElement( 'link' );
970 getMarker().before( el ); // IE: Insert in dom before setting href
971 el.rel = 'stylesheet';
972 if ( media && media !== 'all' ) {
973 el.media = media;
974 }
975 el.href = url;
976 }
977
978 function runScript() {
979 var script, markModuleReady, nestedAddScript;
980 try {
981 script = registry[module].script;
982 markModuleReady = function () {
983 registry[module].state = 'ready';
984 handlePending( module );
985 };
986 nestedAddScript = function ( arr, callback, async, i ) {
987 // Recursively call addScript() in its own callback
988 // for each element of arr.
989 if ( i >= arr.length ) {
990 // We're at the end of the array
991 callback();
992 return;
993 }
994
995 addScript( arr[i], function () {
996 nestedAddScript( arr, callback, async, i + 1 );
997 }, async );
998 };
999
1000 if ( $.isArray( script ) ) {
1001 nestedAddScript( script, markModuleReady, registry[module].async, 0 );
1002 } else if ( $.isFunction( script ) ) {
1003 registry[module].state = 'ready';
1004 script( $ );
1005 handlePending( module );
1006 }
1007 } catch ( e ) {
1008 // This needs to NOT use mw.log because these errors are common in production mode
1009 // and not in debug mode, such as when a symbol that should be global isn't exported
1010 log( 'Exception thrown by ' + module, e );
1011 registry[module].state = 'error';
1012 handlePending( module );
1013 }
1014 }
1015
1016 // This used to be inside runScript, but since that is now fired asychronously
1017 // (after CSS is loaded) we need to set it here right away. It is crucial that
1018 // when execute() is called this is set synchronously, otherwise modules will get
1019 // executed multiple times as the registry will state that it isn't loading yet.
1020 registry[module].state = 'loading';
1021
1022 // Add localizations to message system
1023 if ( $.isPlainObject( registry[module].messages ) ) {
1024 mw.messages.set( registry[module].messages );
1025 }
1026
1027 if ( $.isReady || registry[module].async ) {
1028 // Make sure we don't run the scripts until all (potentially asynchronous)
1029 // stylesheet insertions have completed.
1030 ( function () {
1031 var pending = 0;
1032 checkCssHandles = function () {
1033 // cssHandlesRegistered ensures we don't take off too soon, e.g. when
1034 // one of the cssHandles is fired while we're still creating more handles.
1035 if ( cssHandlesRegistered && pending === 0 && runScript ) {
1036 runScript();
1037 runScript = undefined; // Revoke
1038 }
1039 };
1040 cssHandle = function () {
1041 var check = checkCssHandles;
1042 pending++;
1043 return function () {
1044 if (check) {
1045 pending--;
1046 check();
1047 check = undefined; // Revoke
1048 }
1049 };
1050 };
1051 }() );
1052 } else {
1053 // We are in blocking mode, and so we can't afford to wait for CSS
1054 cssHandle = function () {};
1055 // Run immediately
1056 checkCssHandles = runScript;
1057 }
1058
1059 // Process styles (see also mw.loader.implement)
1060 // * back-compat: { <media>: css }
1061 // * back-compat: { <media>: [url, ..] }
1062 // * { "css": [css, ..] }
1063 // * { "url": { <media>: [url, ..] } }
1064 if ( $.isPlainObject( registry[module].style ) ) {
1065 for ( key in registry[module].style ) {
1066 value = registry[module].style[key];
1067 media = undefined;
1068
1069 if ( key !== 'url' && key !== 'css' ) {
1070 // Backwards compatibility, key is a media-type
1071 if ( typeof value === 'string' ) {
1072 // back-compat: { <media>: css }
1073 // Ignore 'media' because it isn't supported (nor was it used).
1074 // Strings are pre-wrapped in "@media". The media-type was just ""
1075 // (because it had to be set to something).
1076 // This is one of the reasons why this format is no longer used.
1077 addEmbeddedCSS( value, cssHandle() );
1078 } else {
1079 // back-compat: { <media>: [url, ..] }
1080 media = key;
1081 key = 'bc-url';
1082 }
1083 }
1084
1085 // Array of css strings in key 'css',
1086 // or back-compat array of urls from media-type
1087 if ( $.isArray( value ) ) {
1088 for ( i = 0; i < value.length; i += 1 ) {
1089 if ( key === 'bc-url' ) {
1090 // back-compat: { <media>: [url, ..] }
1091 addLink( media, value[i] );
1092 } else if ( key === 'css' ) {
1093 // { "css": [css, ..] }
1094 addEmbeddedCSS( value[i], cssHandle() );
1095 }
1096 }
1097 // Not an array, but a regular object
1098 // Array of urls inside media-type key
1099 } else if ( typeof value === 'object' ) {
1100 // { "url": { <media>: [url, ..] } }
1101 for ( media in value ) {
1102 urls = value[media];
1103 for ( i = 0; i < urls.length; i += 1 ) {
1104 addLink( media, urls[i] );
1105 }
1106 }
1107 }
1108 }
1109 }
1110
1111 // Kick off.
1112 cssHandlesRegistered = true;
1113 checkCssHandles();
1114 }
1115
1116 /**
1117 * Adds a dependencies to the queue with optional callbacks to be run
1118 * when the dependencies are ready or fail
1119 *
1120 * @private
1121 * @param {string|string[]} dependencies Module name or array of string module names
1122 * @param {Function} [ready] Callback to execute when all dependencies are ready
1123 * @param {Function} [error] Callback to execute when any dependency fails
1124 * @param {boolean} [async] If true, load modules asynchronously even if
1125 * document ready has not yet occurred.
1126 */
1127 function request( dependencies, ready, error, async ) {
1128 var n;
1129
1130 // Allow calling by single module name
1131 if ( typeof dependencies === 'string' ) {
1132 dependencies = [dependencies];
1133 }
1134
1135 // Add ready and error callbacks if they were given
1136 if ( ready !== undefined || error !== undefined ) {
1137 jobs[jobs.length] = {
1138 'dependencies': filter(
1139 ['registered', 'loading', 'loaded'],
1140 dependencies
1141 ),
1142 'ready': ready,
1143 'error': error
1144 };
1145 }
1146
1147 // Queue up any dependencies that are registered
1148 dependencies = filter( ['registered'], dependencies );
1149 for ( n = 0; n < dependencies.length; n += 1 ) {
1150 if ( $.inArray( dependencies[n], queue ) === -1 ) {
1151 queue[queue.length] = dependencies[n];
1152 if ( async ) {
1153 // Mark this module as async in the registry
1154 registry[dependencies[n]].async = true;
1155 }
1156 }
1157 }
1158
1159 // Work the queue
1160 mw.loader.work();
1161 }
1162
1163 function sortQuery(o) {
1164 var sorted = {}, key, a = [];
1165 for ( key in o ) {
1166 if ( hasOwn.call( o, key ) ) {
1167 a.push( key );
1168 }
1169 }
1170 a.sort();
1171 for ( key = 0; key < a.length; key += 1 ) {
1172 sorted[a[key]] = o[a[key]];
1173 }
1174 return sorted;
1175 }
1176
1177 /**
1178 * Converts a module map of the form { foo: [ 'bar', 'baz' ], bar: [ 'baz, 'quux' ] }
1179 * to a query string of the form foo.bar,baz|bar.baz,quux
1180 * @private
1181 */
1182 function buildModulesString( moduleMap ) {
1183 var arr = [], p, prefix;
1184 for ( prefix in moduleMap ) {
1185 p = prefix === '' ? '' : prefix + '.';
1186 arr.push( p + moduleMap[prefix].join( ',' ) );
1187 }
1188 return arr.join( '|' );
1189 }
1190
1191 /**
1192 * Asynchronously append a script tag to the end of the body
1193 * that invokes load.php
1194 * @private
1195 * @param {Object} moduleMap Module map, see #buildModulesString
1196 * @param {Object} currReqBase Object with other parameters (other than 'modules') to use in the request
1197 * @param {string} sourceLoadScript URL of load.php
1198 * @param {boolean} async If true, use an asynchronous request even if document ready has not yet occurred
1199 */
1200 function doRequest( moduleMap, currReqBase, sourceLoadScript, async ) {
1201 var request = $.extend(
1202 { modules: buildModulesString( moduleMap ) },
1203 currReqBase
1204 );
1205 request = sortQuery( request );
1206 // Asynchronously append a script tag to the end of the body
1207 // Append &* to avoid triggering the IE6 extension check
1208 addScript( sourceLoadScript + '?' + $.param( request ) + '&*', null, async );
1209 }
1210
1211 /* Public Members */
1212 return {
1213 /**
1214 * The module registry is exposed as an aid for debugging and inspecting page
1215 * state; it is not a public interface for modifying the registry.
1216 *
1217 * @see #registry
1218 * @property
1219 * @private
1220 */
1221 moduleRegistry: registry,
1222
1223 /**
1224 * @inheritdoc #newStyleTag
1225 * @method
1226 */
1227 addStyleTag: newStyleTag,
1228
1229 /**
1230 * Batch-request queued dependencies from the server.
1231 */
1232 work: function () {
1233 var reqBase, splits, maxQueryLength, q, b, bSource, bGroup, bSourceGroup,
1234 source, concatSource, group, g, i, modules, maxVersion, sourceLoadScript,
1235 currReqBase, currReqBaseLength, moduleMap, l,
1236 lastDotIndex, prefix, suffix, bytesAdded, async;
1237
1238 // Build a list of request parameters common to all requests.
1239 reqBase = {
1240 skin: mw.config.get( 'skin' ),
1241 lang: mw.config.get( 'wgUserLanguage' ),
1242 debug: mw.config.get( 'debug' )
1243 };
1244 // Split module batch by source and by group.
1245 splits = {};
1246 maxQueryLength = mw.config.get( 'wgResourceLoaderMaxQueryLength', -1 );
1247
1248 // Appends a list of modules from the queue to the batch
1249 for ( q = 0; q < queue.length; q += 1 ) {
1250 // Only request modules which are registered
1251 if ( registry[queue[q]] !== undefined && registry[queue[q]].state === 'registered' ) {
1252 // Prevent duplicate entries
1253 if ( $.inArray( queue[q], batch ) === -1 ) {
1254 batch[batch.length] = queue[q];
1255 // Mark registered modules as loading
1256 registry[queue[q]].state = 'loading';
1257 }
1258 }
1259 }
1260
1261 mw.loader.store.init();
1262 if ( mw.loader.store.enabled ) {
1263 concatSource = [];
1264 batch = $.grep( batch, function ( module ) {
1265 var source = mw.loader.store.get( module );
1266 if ( source ) {
1267 concatSource.push( source );
1268 return false;
1269 }
1270 return true;
1271 } );
1272 if ( mw.loader.store.useFunction ) {
1273 /* jshint -W054 */
1274 new Function( concatSource.join( ';' ) )();
1275 } else {
1276 $.globalEval( concatSource.join( ';' ) );
1277 }
1278 }
1279
1280 // Early exit if there's nothing to load...
1281 if ( !batch.length ) {
1282 return;
1283 }
1284
1285 // The queue has been processed into the batch, clear up the queue.
1286 queue = [];
1287
1288 // Always order modules alphabetically to help reduce cache
1289 // misses for otherwise identical content.
1290 batch.sort();
1291
1292 // Split batch by source and by group.
1293 for ( b = 0; b < batch.length; b += 1 ) {
1294 bSource = registry[batch[b]].source;
1295 bGroup = registry[batch[b]].group;
1296 if ( splits[bSource] === undefined ) {
1297 splits[bSource] = {};
1298 }
1299 if ( splits[bSource][bGroup] === undefined ) {
1300 splits[bSource][bGroup] = [];
1301 }
1302 bSourceGroup = splits[bSource][bGroup];
1303 bSourceGroup[bSourceGroup.length] = batch[b];
1304 }
1305
1306 // Clear the batch - this MUST happen before we append any
1307 // script elements to the body or it's possible that a script
1308 // will be locally cached, instantly load, and work the batch
1309 // again, all before we've cleared it causing each request to
1310 // include modules which are already loaded.
1311 batch = [];
1312
1313 for ( source in splits ) {
1314
1315 sourceLoadScript = sources[source].loadScript;
1316
1317 for ( group in splits[source] ) {
1318
1319 // Cache access to currently selected list of
1320 // modules for this group from this source.
1321 modules = splits[source][group];
1322
1323 // Calculate the highest timestamp
1324 maxVersion = 0;
1325 for ( g = 0; g < modules.length; g += 1 ) {
1326 if ( registry[modules[g]].version > maxVersion ) {
1327 maxVersion = registry[modules[g]].version;
1328 }
1329 }
1330
1331 currReqBase = $.extend( { version: formatVersionNumber( maxVersion ) }, reqBase );
1332 // For user modules append a user name to the request.
1333 if ( group === 'user' && mw.config.get( 'wgUserName' ) !== null ) {
1334 currReqBase.user = mw.config.get( 'wgUserName' );
1335 }
1336 currReqBaseLength = $.param( currReqBase ).length;
1337 async = true;
1338 // We may need to split up the request to honor the query string length limit,
1339 // so build it piece by piece.
1340 l = currReqBaseLength + 9; // '&modules='.length == 9
1341
1342 moduleMap = {}; // { prefix: [ suffixes ] }
1343
1344 for ( i = 0; i < modules.length; i += 1 ) {
1345 // Determine how many bytes this module would add to the query string
1346 lastDotIndex = modules[i].lastIndexOf( '.' );
1347 // Note that these substr() calls work even if lastDotIndex == -1
1348 prefix = modules[i].substr( 0, lastDotIndex );
1349 suffix = modules[i].substr( lastDotIndex + 1 );
1350 bytesAdded = moduleMap[prefix] !== undefined
1351 ? suffix.length + 3 // '%2C'.length == 3
1352 : modules[i].length + 3; // '%7C'.length == 3
1353
1354 // If the request would become too long, create a new one,
1355 // but don't create empty requests
1356 if ( maxQueryLength > 0 && !$.isEmptyObject( moduleMap ) && l + bytesAdded > maxQueryLength ) {
1357 // This request would become too long, create a new one
1358 // and fire off the old one
1359 doRequest( moduleMap, currReqBase, sourceLoadScript, async );
1360 moduleMap = {};
1361 async = true;
1362 l = currReqBaseLength + 9;
1363 }
1364 if ( moduleMap[prefix] === undefined ) {
1365 moduleMap[prefix] = [];
1366 }
1367 moduleMap[prefix].push( suffix );
1368 if ( !registry[modules[i]].async ) {
1369 // If this module is blocking, make the entire request blocking
1370 // This is slightly suboptimal, but in practice mixing of blocking
1371 // and async modules will only occur in debug mode.
1372 async = false;
1373 }
1374 l += bytesAdded;
1375 }
1376 // If there's anything left in moduleMap, request that too
1377 if ( !$.isEmptyObject( moduleMap ) ) {
1378 doRequest( moduleMap, currReqBase, sourceLoadScript, async );
1379 }
1380 }
1381 }
1382 },
1383
1384 /**
1385 * Register a source.
1386 *
1387 * @param {string} id Short lowercase a-Z string representing a source, only used internally.
1388 * @param {Object} props Object containing only the loadScript property which is a url to
1389 * the load.php location of the source.
1390 * @return {boolean}
1391 */
1392 addSource: function ( id, props ) {
1393 var source;
1394 // Allow multiple additions
1395 if ( typeof id === 'object' ) {
1396 for ( source in id ) {
1397 mw.loader.addSource( source, id[source] );
1398 }
1399 return true;
1400 }
1401
1402 if ( sources[id] !== undefined ) {
1403 throw new Error( 'source already registered: ' + id );
1404 }
1405
1406 sources[id] = props;
1407
1408 return true;
1409 },
1410
1411 /**
1412 * Register a module, letting the system know about it and its
1413 * properties. Startup modules contain calls to this function.
1414 *
1415 * @param {string} module Module name
1416 * @param {number} version Module version number as a timestamp (falls backs to 0)
1417 * @param {string|Array|Function} dependencies One string or array of strings of module
1418 * names on which this module depends, or a function that returns that array.
1419 * @param {string} [group=null] Group which the module is in
1420 * @param {string} [source='local'] Name of the source
1421 */
1422 register: function ( module, version, dependencies, group, source ) {
1423 var m;
1424 // Allow multiple registration
1425 if ( typeof module === 'object' ) {
1426 for ( m = 0; m < module.length; m += 1 ) {
1427 // module is an array of module names
1428 if ( typeof module[m] === 'string' ) {
1429 mw.loader.register( module[m] );
1430 // module is an array of arrays
1431 } else if ( typeof module[m] === 'object' ) {
1432 mw.loader.register.apply( mw.loader, module[m] );
1433 }
1434 }
1435 return;
1436 }
1437 // Validate input
1438 if ( typeof module !== 'string' ) {
1439 throw new Error( 'module must be a string, not a ' + typeof module );
1440 }
1441 if ( registry[module] !== undefined ) {
1442 throw new Error( 'module already registered: ' + module );
1443 }
1444 // List the module as registered
1445 registry[module] = {
1446 version: version !== undefined ? parseInt( version, 10 ) : 0,
1447 dependencies: [],
1448 group: typeof group === 'string' ? group : null,
1449 source: typeof source === 'string' ? source: 'local',
1450 state: 'registered'
1451 };
1452 if ( typeof dependencies === 'string' ) {
1453 // Allow dependencies to be given as a single module name
1454 registry[module].dependencies = [ dependencies ];
1455 } else if ( typeof dependencies === 'object' || $.isFunction( dependencies ) ) {
1456 // Allow dependencies to be given as an array of module names
1457 // or a function which returns an array
1458 registry[module].dependencies = dependencies;
1459 }
1460 },
1461
1462 /**
1463 * Implement a module given the components that make up the module.
1464 *
1465 * When #load or #using requests one or more modules, the server
1466 * response contain calls to this function.
1467 *
1468 * All arguments are required.
1469 *
1470 * @param {string} module Name of module
1471 * @param {Function|Array} script Function with module code or Array of URLs to
1472 * be used as the src attribute of a new `<script>` tag.
1473 * @param {Object} style Should follow one of the following patterns:
1474 *
1475 * { "css": [css, ..] }
1476 * { "url": { <media>: [url, ..] } }
1477 *
1478 * And for backwards compatibility (needs to be supported forever due to caching):
1479 *
1480 * { <media>: css }
1481 * { <media>: [url, ..] }
1482 *
1483 * The reason css strings are not concatenated anymore is bug 31676. We now check
1484 * whether it's safe to extend the stylesheet (see #canExpandStylesheetWith).
1485 *
1486 * @param {Object} msgs List of key/value pairs to be added to mw#messages.
1487 */
1488 implement: function ( module, script, style, msgs ) {
1489 // Validate input
1490 if ( typeof module !== 'string' ) {
1491 throw new Error( 'module must be a string, not a ' + typeof module );
1492 }
1493 if ( !$.isFunction( script ) && !$.isArray( script ) ) {
1494 throw new Error( 'script must be a function or an array, not a ' + typeof script );
1495 }
1496 if ( !$.isPlainObject( style ) ) {
1497 throw new Error( 'style must be an object, not a ' + typeof style );
1498 }
1499 if ( !$.isPlainObject( msgs ) ) {
1500 throw new Error( 'msgs must be an object, not a ' + typeof msgs );
1501 }
1502 // Automatically register module
1503 if ( registry[module] === undefined ) {
1504 mw.loader.register( module );
1505 }
1506 // Check for duplicate implementation
1507 if ( registry[module] !== undefined && registry[module].script !== undefined ) {
1508 throw new Error( 'module already implemented: ' + module );
1509 }
1510 // Attach components
1511 registry[module].script = script;
1512 registry[module].style = style;
1513 registry[module].messages = msgs;
1514 // The module may already have been marked as erroneous
1515 if ( $.inArray( registry[module].state, ['error', 'missing'] ) === -1 ) {
1516 registry[module].state = 'loaded';
1517 if ( allReady( registry[module].dependencies ) ) {
1518 execute( module );
1519 }
1520 }
1521 },
1522
1523 /**
1524 * Execute a function as soon as one or more required modules are ready.
1525 *
1526 * @param {string|Array} dependencies Module name or array of modules names the callback
1527 * dependends on to be ready before executing
1528 * @param {Function} [ready] callback to execute when all dependencies are ready
1529 * @param {Function} [error] callback to execute when if dependencies have a errors
1530 */
1531 using: function ( dependencies, ready, error ) {
1532 var tod = typeof dependencies;
1533 // Validate input
1534 if ( tod !== 'object' && tod !== 'string' ) {
1535 throw new Error( 'dependencies must be a string or an array, not a ' + tod );
1536 }
1537 // Allow calling with a single dependency as a string
1538 if ( tod === 'string' ) {
1539 dependencies = [ dependencies ];
1540 }
1541 // Resolve entire dependency map
1542 dependencies = resolve( dependencies );
1543 if ( allReady( dependencies ) ) {
1544 // Run ready immediately
1545 if ( $.isFunction( ready ) ) {
1546 ready();
1547 }
1548 } else if ( filter( ['error', 'missing'], dependencies ).length ) {
1549 // Execute error immediately if any dependencies have errors
1550 if ( $.isFunction( error ) ) {
1551 error( new Error( 'one or more dependencies have state "error" or "missing"' ),
1552 dependencies );
1553 }
1554 } else {
1555 // Not all dependencies are ready: queue up a request
1556 request( dependencies, ready, error );
1557 }
1558 },
1559
1560 /**
1561 * Load an external script or one or more modules.
1562 *
1563 * @param {string|Array} modules Either the name of a module, array of modules,
1564 * or a URL of an external script or style
1565 * @param {string} [type='text/javascript'] mime-type to use if calling with a URL of an
1566 * external script or style; acceptable values are "text/css" and
1567 * "text/javascript"; if no type is provided, text/javascript is assumed.
1568 * @param {boolean} [async] If true, load modules asynchronously
1569 * even if document ready has not yet occurred. If false, block before
1570 * document ready and load async after. If not set, true will be
1571 * assumed if loading a URL, and false will be assumed otherwise.
1572 */
1573 load: function ( modules, type, async ) {
1574 var filtered, m, module, l;
1575
1576 // Validate input
1577 if ( typeof modules !== 'object' && typeof modules !== 'string' ) {
1578 throw new Error( 'modules must be a string or an array, not a ' + typeof modules );
1579 }
1580 // Allow calling with an external url or single dependency as a string
1581 if ( typeof modules === 'string' ) {
1582 // Support adding arbitrary external scripts
1583 if ( /^(https?:)?\/\//.test( modules ) ) {
1584 if ( async === undefined ) {
1585 // Assume async for bug 34542
1586 async = true;
1587 }
1588 if ( type === 'text/css' ) {
1589 // IE7-8 throws security warnings when inserting a <link> tag
1590 // with a protocol-relative URL set though attributes (instead of
1591 // properties) - when on HTTPS. See also bug #.
1592 l = document.createElement( 'link' );
1593 l.rel = 'stylesheet';
1594 l.href = modules;
1595 $( 'head' ).append( l );
1596 return;
1597 }
1598 if ( type === 'text/javascript' || type === undefined ) {
1599 addScript( modules, null, async );
1600 return;
1601 }
1602 // Unknown type
1603 throw new Error( 'invalid type for external url, must be text/css or text/javascript. not ' + type );
1604 }
1605 // Called with single module
1606 modules = [ modules ];
1607 }
1608
1609 // Filter out undefined modules, otherwise resolve() will throw
1610 // an exception for trying to load an undefined module.
1611 // Undefined modules are acceptable here in load(), because load() takes
1612 // an array of unrelated modules, whereas the modules passed to
1613 // using() are related and must all be loaded.
1614 for ( filtered = [], m = 0; m < modules.length; m += 1 ) {
1615 module = registry[modules[m]];
1616 if ( module !== undefined ) {
1617 if ( $.inArray( module.state, ['error', 'missing'] ) === -1 ) {
1618 filtered[filtered.length] = modules[m];
1619 }
1620 }
1621 }
1622
1623 if ( filtered.length === 0 ) {
1624 return;
1625 }
1626 // Resolve entire dependency map
1627 filtered = resolve( filtered );
1628 // If all modules are ready, nothing to be done
1629 if ( allReady( filtered ) ) {
1630 return;
1631 }
1632 // If any modules have errors: also quit.
1633 if ( filter( ['error', 'missing'], filtered ).length ) {
1634 return;
1635 }
1636 // Since some modules are not yet ready, queue up a request.
1637 request( filtered, undefined, undefined, async );
1638 },
1639
1640 /**
1641 * Change the state of one or more modules.
1642 *
1643 * @param {string|Object} module module name or object of module name/state pairs
1644 * @param {string} state state name
1645 */
1646 state: function ( module, state ) {
1647 var m;
1648
1649 if ( typeof module === 'object' ) {
1650 for ( m in module ) {
1651 mw.loader.state( m, module[m] );
1652 }
1653 return;
1654 }
1655 if ( registry[module] === undefined ) {
1656 mw.loader.register( module );
1657 }
1658 if ( $.inArray( state, ['ready', 'error', 'missing'] ) !== -1
1659 && registry[module].state !== state ) {
1660 // Make sure pending modules depending on this one get executed if their
1661 // dependencies are now fulfilled!
1662 registry[module].state = state;
1663 handlePending( module );
1664 } else {
1665 registry[module].state = state;
1666 }
1667 },
1668
1669 /**
1670 * Get the version of a module.
1671 *
1672 * @param {string} module Name of module to get version for
1673 */
1674 getVersion: function ( module ) {
1675 if ( registry[module] !== undefined && registry[module].version !== undefined ) {
1676 return formatVersionNumber( registry[module].version );
1677 }
1678 return null;
1679 },
1680
1681 /**
1682 * @inheritdoc #getVersion
1683 * @deprecated since 1.18 use #getVersion instead
1684 */
1685 version: function () {
1686 return mw.loader.getVersion.apply( mw.loader, arguments );
1687 },
1688
1689 /**
1690 * Get the state of a module.
1691 *
1692 * @param {string} module name of module to get state for
1693 */
1694 getState: function ( module ) {
1695 if ( registry[module] !== undefined && registry[module].state !== undefined ) {
1696 return registry[module].state;
1697 }
1698 return null;
1699 },
1700
1701 /**
1702 * Get names of all registered modules.
1703 *
1704 * @return {Array}
1705 */
1706 getModuleNames: function () {
1707 return $.map( registry, function ( i, key ) {
1708 return key;
1709 } );
1710 },
1711
1712 /**
1713 * Load the `mediawiki.user` module.
1714 *
1715 * For backwards-compatibility with cached pages from before 2013 where:
1716 *
1717 * - the `mediawiki.user` module didn't exist yet
1718 * - `mw.user` was still part of mediawiki.js
1719 * - `mw.loader.go` still existed and called after `mw.loader.load()`
1720 */
1721 go: function () {
1722 mw.loader.load( 'mediawiki.user' );
1723 },
1724
1725 /**
1726 * @inheritdoc mw.inspect#runReports
1727 * @method
1728 */
1729 inspect: function () {
1730 var args = slice.call( arguments );
1731 mw.loader.using( 'mediawiki.inspect', function () {
1732 mw.inspect.runReports.apply( mw.inspect, args );
1733 } );
1734 },
1735
1736 /**
1737 * On browsers that implement the localStorage API, the module store serves as a
1738 * smart complement to the browser cache. Unlike the browser cache, the module store
1739 * can slice a concatenated response from ResourceLoader into its constituent
1740 * modules and cache each of them separately, using each module's versioning scheme
1741 * to determine when the cache should be invalidated.
1742 *
1743 * @singleton
1744 * @class mw.loader.store
1745 */
1746 store: {
1747 // Whether the store is in use on this page.
1748 enabled: null,
1749
1750 // The contents of the store, mapping '[module name]@[version]' keys
1751 // to module implementations.
1752 items: {},
1753
1754 // Cache hit stats
1755 stats: { hits: 0, misses: 0, expired: 0 },
1756
1757 /**
1758 * Construct a JSON-serializable object representing the content of the store.
1759 * @return {Object} Module store contents.
1760 */
1761 toJSON: function () {
1762 return { items: mw.loader.store.items, vary: mw.loader.store.getVary() };
1763 },
1764
1765 /**
1766 * Get the localStorage key for the entire module store. The key references
1767 * $wgDBname to prevent clashes between wikis which share a common host.
1768 *
1769 * @return {string} localStorage item key
1770 */
1771 getStoreKey: function () {
1772 return 'MediaWikiModuleStore:' + mw.config.get( 'wgDBname' );
1773 },
1774
1775 /**
1776 * Get a string key on which to vary the module cache.
1777 * @return {string} String of concatenated vary conditions.
1778 */
1779 getVary: function () {
1780 return [
1781 mw.config.get( 'skin' ),
1782 mw.config.get( 'wgResourceLoaderStorageVersion' ),
1783 mw.config.get( 'wgUserLanguage' )
1784 ].join(':');
1785 },
1786
1787 /**
1788 * Get a string key for a specific module. The key format is '[name]@[version]'.
1789 *
1790 * @param {string} module Module name
1791 * @return {string|null} Module key or null if module does not exist
1792 */
1793 getModuleKey: function ( module ) {
1794 return typeof registry[module] === 'object' ?
1795 ( module + '@' + registry[module].version ) : null;
1796 },
1797
1798 /**
1799 * Initialize the store by retrieving it from localStorage and (if successfully
1800 * retrieved) decoding the stored JSON value to a plain object.
1801 *
1802 * The try / catch block is used for JSON & localStorage feature detection.
1803 * See the in-line documentation for Modernizr's localStorage feature detection
1804 * code for a full account of why we need a try / catch: <http://git.io/4NEwKg>.
1805 */
1806 init: function () {
1807 var raw, data;
1808
1809 if ( mw.loader.store.enabled !== null ) {
1810 // #init already ran.
1811 return;
1812 }
1813
1814 if ( !mw.config.get( 'wgResourceLoaderStorageEnabled' ) || mw.config.get( 'debug' ) ) {
1815 // Disabled by configuration, or because debug mode is set.
1816 mw.loader.store.enabled = false;
1817 return;
1818 }
1819
1820 try {
1821 raw = localStorage.getItem( mw.loader.store.getStoreKey() );
1822 // If we get here, localStorage is available; mark enabled.
1823 mw.loader.store.enabled = true;
1824 mw.loader.store.useFunction = !!Math.floor( Math.random() * 2 );
1825 data = JSON.parse( raw );
1826 if ( data && typeof data.items === 'object' && data.vary === mw.loader.store.getVary() ) {
1827 mw.loader.store.items = data.items;
1828 return;
1829 }
1830 } catch (e) {}
1831
1832 if ( raw === undefined ) {
1833 mw.loader.store.enabled = false; // localStorage failed; disable store.
1834 } else {
1835 mw.loader.store.update();
1836 }
1837 },
1838
1839 /**
1840 * Retrieve a module from the store and update cache hit stats.
1841 *
1842 * @param {string} module Module name
1843 * @return {string|boolean} Module implementation or false if unavailable
1844 */
1845 get: function ( module ) {
1846 var key;
1847
1848 if ( mw.loader.store.enabled !== true ) {
1849 return false;
1850 }
1851
1852 key = mw.loader.store.getModuleKey( module );
1853 if ( key in mw.loader.store.items ) {
1854 mw.loader.store.stats.hits++;
1855 return mw.loader.store.items[key];
1856 }
1857 mw.loader.store.stats.misses++;
1858 return false;
1859 },
1860
1861 /**
1862 * Stringify a module and queue it for storage.
1863 *
1864 * @param {string} module Module name
1865 * @param {Object} descriptor The module's descriptor as set in the registry
1866 */
1867 set: function ( module, descriptor ) {
1868 var args, key;
1869
1870 if ( mw.loader.store.enabled !== true ) {
1871 return false;
1872 }
1873
1874 key = mw.loader.store.getModuleKey( module );
1875
1876 if ( key in mw.loader.store.items ) {
1877 // Already set; decline to store.
1878 return false;
1879 }
1880
1881 if ( descriptor.state !== 'ready' ) {
1882 // Module failed to load; decline to store.
1883 return false;
1884 }
1885
1886 if ( !descriptor.version || $.inArray( descriptor.group, [ 'private', 'user', 'site' ] ) !== -1 ) {
1887 // Unversioned, private, or site-/user-specific; decline to store.
1888 return false;
1889 }
1890
1891 if ( $.inArray( undefined, [ descriptor.script, descriptor.style, descriptor.messages ] ) !== -1 ) {
1892 // Partial descriptor; decline to store.
1893 return false;
1894 }
1895
1896 try {
1897 args = [
1898 JSON.stringify( module ),
1899 typeof descriptor.script === 'function' ?
1900 String( descriptor.script ) : JSON.stringify( descriptor.script ),
1901 JSON.stringify( descriptor.style ),
1902 JSON.stringify( descriptor.messages )
1903 ];
1904 } catch (e) {
1905 return;
1906 }
1907 mw.loader.store.items[key] = 'mw.loader.implement(' + args.join(',') + ');';
1908 mw.loader.store.update();
1909 },
1910
1911 /**
1912 * Iterate through the module store, removing any item that does not correspond
1913 * (in name and version) to an item in the module registry.
1914 */
1915 prune: function () {
1916 var key, module;
1917
1918 if ( mw.loader.store.enabled !== true ) {
1919 return false;
1920 }
1921
1922 for ( key in mw.loader.store.items ) {
1923 module = key.substring( 0, key.indexOf( '@' ) );
1924 if ( mw.loader.store.getModuleKey( module ) !== key ) {
1925 mw.loader.store.stats.expired++;
1926 delete mw.loader.store.items[key];
1927 }
1928 }
1929 },
1930
1931 /**
1932 * Sync modules to localStorage.
1933 *
1934 * This function debounces localStorage updates. When called multiple times in
1935 * quick succession, the calls are coalesced into a single update operation.
1936 * This allows us to call #update without having to consider the module load
1937 * queue; the call to localStorage.setItem will be naturally deferred until the
1938 * page is quiescent.
1939 *
1940 * Because localStorage is shared by all pages with the same origin, if multiple
1941 * pages are loaded with different module sets, the possibility exists that
1942 * modules saved by one page will be clobbered by another. But the impact would
1943 * be minor and the problem would be corrected by subsequent page views.
1944 */
1945 update: ( function () {
1946 var timer;
1947
1948 function flush() {
1949 var data, key = mw.loader.store.getStoreKey();
1950 if ( mw.loader.store.enabled !== true ) {
1951 return false;
1952 }
1953 mw.loader.store.prune();
1954 try {
1955 // Replacing the content of the module store might fail if the new
1956 // contents would exceed the browser's localStorage size limit. To
1957 // avoid clogging the browser with stale data, always remove the old
1958 // value before attempting to set the new one.
1959 localStorage.removeItem( key );
1960 data = JSON.stringify( mw.loader.store );
1961 localStorage.setItem( key, data );
1962 } catch (e) {}
1963 }
1964
1965 return function () {
1966 clearTimeout( timer );
1967 timer = setTimeout( flush, 2000 );
1968 };
1969 }() )
1970 }
1971 };
1972 }() ),
1973
1974 /**
1975 * HTML construction helper functions
1976 *
1977 * @example
1978 *
1979 * var Html, output;
1980 *
1981 * Html = mw.html;
1982 * output = Html.element( 'div', {}, new Html.Raw(
1983 * Html.element( 'img', { src: '<' } )
1984 * ) );
1985 * mw.log( output ); // <div><img src="&lt;"/></div>
1986 *
1987 * @class mw.html
1988 * @singleton
1989 */
1990 html: ( function () {
1991 function escapeCallback( s ) {
1992 switch ( s ) {
1993 case '\'':
1994 return '&#039;';
1995 case '"':
1996 return '&quot;';
1997 case '<':
1998 return '&lt;';
1999 case '>':
2000 return '&gt;';
2001 case '&':
2002 return '&amp;';
2003 }
2004 }
2005
2006 return {
2007 /**
2008 * Escape a string for HTML. Converts special characters to HTML entities.
2009 * @param {string} s The string to escape
2010 */
2011 escape: function ( s ) {
2012 return s.replace( /['"<>&]/g, escapeCallback );
2013 },
2014
2015 /**
2016 * Create an HTML element string, with safe escaping.
2017 *
2018 * @param {string} name The tag name.
2019 * @param {Object} attrs An object with members mapping element names to values
2020 * @param {Mixed} contents The contents of the element. May be either:
2021 * - string: The string is escaped.
2022 * - null or undefined: The short closing form is used, e.g. <br/>.
2023 * - this.Raw: The value attribute is included without escaping.
2024 * - this.Cdata: The value attribute is included, and an exception is
2025 * thrown if it contains an illegal ETAGO delimiter.
2026 * See http://www.w3.org/TR/1999/REC-html401-19991224/appendix/notes.html#h-B.3.2
2027 */
2028 element: function ( name, attrs, contents ) {
2029 var v, attrName, s = '<' + name;
2030
2031 for ( attrName in attrs ) {
2032 v = attrs[attrName];
2033 // Convert name=true, to name=name
2034 if ( v === true ) {
2035 v = attrName;
2036 // Skip name=false
2037 } else if ( v === false ) {
2038 continue;
2039 }
2040 s += ' ' + attrName + '="' + this.escape( String( v ) ) + '"';
2041 }
2042 if ( contents === undefined || contents === null ) {
2043 // Self close tag
2044 s += '/>';
2045 return s;
2046 }
2047 // Regular open tag
2048 s += '>';
2049 switch ( typeof contents ) {
2050 case 'string':
2051 // Escaped
2052 s += this.escape( contents );
2053 break;
2054 case 'number':
2055 case 'boolean':
2056 // Convert to string
2057 s += String( contents );
2058 break;
2059 default:
2060 if ( contents instanceof this.Raw ) {
2061 // Raw HTML inclusion
2062 s += contents.value;
2063 } else if ( contents instanceof this.Cdata ) {
2064 // CDATA
2065 if ( /<\/[a-zA-z]/.test( contents.value ) ) {
2066 throw new Error( 'mw.html.element: Illegal end tag found in CDATA' );
2067 }
2068 s += contents.value;
2069 } else {
2070 throw new Error( 'mw.html.element: Invalid type of contents' );
2071 }
2072 }
2073 s += '</' + name + '>';
2074 return s;
2075 },
2076
2077 /**
2078 * Wrapper object for raw HTML passed to mw.html.element().
2079 * @class mw.html.Raw
2080 */
2081 Raw: function ( value ) {
2082 this.value = value;
2083 },
2084
2085 /**
2086 * Wrapper object for CDATA element contents passed to mw.html.element()
2087 * @class mw.html.Cdata
2088 */
2089 Cdata: function ( value ) {
2090 this.value = value;
2091 }
2092 };
2093 }() ),
2094
2095 // Skeleton user object. mediawiki.user.js extends this
2096 user: {
2097 options: new Map(),
2098 tokens: new Map()
2099 },
2100
2101 /**
2102 * Registry and firing of events.
2103 *
2104 * MediaWiki has various interface components that are extended, enhanced
2105 * or manipulated in some other way by extensions, gadgets and even
2106 * in core itself.
2107 *
2108 * This framework helps streamlining the timing of when these other
2109 * code paths fire their plugins (instead of using document-ready,
2110 * which can and should be limited to firing only once).
2111 *
2112 * Features like navigating to other wiki pages, previewing an edit
2113 * and editing itself – without a refresh – can then retrigger these
2114 * hooks accordingly to ensure everything still works as expected.
2115 *
2116 * Example usage:
2117 *
2118 * mw.hook( 'wikipage.content' ).add( fn ).remove( fn );
2119 * mw.hook( 'wikipage.content' ).fire( $content );
2120 *
2121 * Handlers can be added and fired for arbitrary event names at any time. The same
2122 * event can be fired multiple times. The last run of an event is memorized
2123 * (similar to `$(document).ready` and `$.Deferred().done`).
2124 * This means if an event is fired, and a handler added afterwards, the added
2125 * function will be fired right away with the last given event data.
2126 *
2127 * Like Deferreds and Promises, the mw.hook object is both detachable and chainable.
2128 * Thus allowing flexible use and optimal maintainability and authority control.
2129 * You can pass around the `add` and/or `fire` method to another piece of code
2130 * without it having to know the event name (or `mw.hook` for that matter).
2131 *
2132 * var h = mw.hook( 'bar.ready' );
2133 * new mw.Foo( .. ).fetch( { callback: h.fire } );
2134 *
2135 * Note: Events are documented with an underscore instead of a dot in the event
2136 * name due to jsduck not supporting dots in that position.
2137 *
2138 * @class mw.hook
2139 */
2140 hook: ( function () {
2141 var lists = {};
2142
2143 /**
2144 * Create an instance of mw.hook.
2145 *
2146 * @method hook
2147 * @member mw
2148 * @param {string} name Name of hook.
2149 * @return {mw.hook}
2150 */
2151 return function ( name ) {
2152 var list = lists[name] || ( lists[name] = $.Callbacks( 'memory' ) );
2153
2154 return {
2155 /**
2156 * Register a hook handler
2157 * @param {Function...} handler Function to bind.
2158 * @chainable
2159 */
2160 add: list.add,
2161
2162 /**
2163 * Unregister a hook handler
2164 * @param {Function...} handler Function to unbind.
2165 * @chainable
2166 */
2167 remove: list.remove,
2168
2169 /**
2170 * Run a hook.
2171 * @param {Mixed...} data
2172 * @chainable
2173 */
2174 fire: function () {
2175 return list.fireWith( null, slice.call( arguments ) );
2176 }
2177 };
2178 };
2179 }() )
2180 };
2181
2182 }( jQuery ) );
2183
2184 // Alias $j to jQuery for backwards compatibility
2185 window.$j = jQuery;
2186
2187 // Attach to window and globally alias
2188 window.mw = window.mediaWiki = mw;
2189
2190 // Auto-register from pre-loaded startup scripts
2191 if ( jQuery.isFunction( window.startUp ) ) {
2192 window.startUp();
2193 window.startUp = undefined;
2194 }
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