2 * Base library for MediaWiki.
4 * Exposed globally as `mediaWiki` with `mw` as shortcut.
7 * @alternateClassName mediaWiki
10 /*jshint latedef:false */
15 hasOwn
= Object
.prototype.hasOwnProperty
,
16 slice
= Array
.prototype.slice
,
17 trackCallbacks
= $.Callbacks( 'memory' ),
22 * FNV132 hash function
24 * This function implements the 32-bit version of FNV-1.
25 * It is equivalent to hash( 'fnv132', ... ) in PHP, except
26 * its output is base 36 rather than hex.
27 * See <https://en.wikipedia.org/wiki/FNV_hash_function>
30 * @param {string} str String to hash
31 * @return {string} hash as an seven-character base 36 string
33 function fnv132( str
) {
34 /*jshint bitwise:false */
35 var hash
= 0x811C9DC5,
38 for ( i
= 0; i
< str
.length
; i
++ ) {
39 hash
+= ( hash
<< 1 ) + ( hash
<< 4 ) + ( hash
<< 7 ) + ( hash
<< 8 ) + ( hash
<< 24 );
40 hash
^= str
.charCodeAt( i
);
43 hash
= ( hash
>>> 0 ).toString( 36 );
44 while ( hash
.length
< 7 ) {
52 * Create an object that can be read from or written to from methods that allow
53 * interaction both with single and multiple properties at once.
57 * var collection, query, results;
59 * // Create your address book
60 * collection = new mw.Map();
62 * // This data could be coming from an external source (eg. API/AJAX)
64 * 'John Doe': 'john@example.org',
65 * 'Jane Doe': 'jane@example.org',
66 * 'George van Halen': 'gvanhalen@example.org'
69 * wanted = ['John Doe', 'Jane Doe', 'Daniel Jackson'];
71 * // You can detect missing keys first
72 * if ( !collection.exists( wanted ) ) {
73 * // One or more are missing (in this case: "Daniel Jackson")
74 * mw.log( 'One or more names were not found in your address book' );
77 * // Or just let it give you what it can. Optionally fill in from a default.
78 * results = collection.get( wanted, 'nobody@example.com' );
79 * mw.log( results['Jane Doe'] ); // "jane@example.org"
80 * mw.log( results['Daniel Jackson'] ); // "nobody@example.com"
85 * @param {Object|boolean} [values] The value-baring object to be mapped. Defaults to an
87 * For backwards-compatibility with mw.config, this can also be `true` in which case values
88 * are copied to the Window object as global variables (T72470). Values are copied in
89 * one direction only. Changes to globals are not reflected in the map.
91 function Map( values
) {
92 if ( values
=== true ) {
95 // Override #set to also set the global variable
96 this.set = function ( selection
, value
) {
99 if ( $.isPlainObject( selection
) ) {
100 for ( s
in selection
) {
101 setGlobalMapValue( this, s
, selection
[ s
] );
105 if ( typeof selection
=== 'string' && arguments
.length
) {
106 setGlobalMapValue( this, selection
, value
);
115 this.values
= values
|| {};
119 * Alias property to the global object.
123 * @param {mw.Map} map
124 * @param {string} key
125 * @param {Mixed} value
127 function setGlobalMapValue( map
, key
, value
) {
128 map
.values
[ key
] = value
;
133 // Deprecation notice for mw.config globals (T58550, T72470)
134 map
=== mw
.config
&& 'Use mw.config instead.'
140 * Get the value of one or more keys.
142 * If called with no arguments, all values are returned.
144 * @param {string|Array} [selection] Key or array of keys to retrieve values for.
145 * @param {Mixed} [fallback=null] Value for keys that don't exist.
146 * @return {Mixed|Object| null} If selection was a string, returns the value,
147 * If selection was an array, returns an object of key/values.
148 * If no selection is passed, the 'values' container is returned. (Beware that,
149 * as is the default in JavaScript, the object is returned by reference.)
151 get: function ( selection
, fallback
) {
153 // If we only do this in the `return` block, it'll fail for the
154 // call to get() from the mutli-selection block.
155 fallback
= arguments
.length
> 1 ? fallback
: null;
157 if ( $.isArray( selection
) ) {
158 selection
= slice
.call( selection
);
160 for ( i
= 0; i
< selection
.length
; i
++ ) {
161 results
[ selection
[ i
] ] = this.get( selection
[ i
], fallback
);
166 if ( typeof selection
=== 'string' ) {
167 if ( !hasOwn
.call( this.values
, selection
) ) {
170 return this.values
[ selection
];
173 if ( selection
=== undefined ) {
177 // Invalid selection key
182 * Set one or more key/value pairs.
184 * @param {string|Object} selection Key to set value for, or object mapping keys to values
185 * @param {Mixed} [value] Value to set (optional, only in use when key is a string)
186 * @return {boolean} True on success, false on failure
188 set: function ( selection
, value
) {
191 if ( $.isPlainObject( selection
) ) {
192 for ( s
in selection
) {
193 this.values
[ s
] = selection
[ s
];
197 if ( typeof selection
=== 'string' && arguments
.length
> 1 ) {
198 this.values
[ selection
] = value
;
205 * Check if one or more keys exist.
207 * @param {Mixed} selection Key or array of keys to check
208 * @return {boolean} True if the key(s) exist
210 exists: function ( selection
) {
213 if ( $.isArray( selection
) ) {
214 for ( s
= 0; s
< selection
.length
; s
++ ) {
215 if ( typeof selection
[ s
] !== 'string' || !hasOwn
.call( this.values
, selection
[ s
] ) ) {
221 return typeof selection
=== 'string' && hasOwn
.call( this.values
, selection
);
226 * Object constructor for messages.
228 * Similar to the Message class in MediaWiki PHP.
230 * Format defaults to 'text'.
236 * 'hello': 'Hello world',
237 * 'hello-user': 'Hello, $1!',
238 * 'welcome-user': 'Welcome back to $2, $1! Last visit by $1: $3'
241 * obj = new mw.Message( mw.messages, 'hello' );
242 * mw.log( obj.text() );
245 * obj = new mw.Message( mw.messages, 'hello-user', [ 'John Doe' ] );
246 * mw.log( obj.text() );
247 * // Hello, John Doe!
249 * obj = new mw.Message( mw.messages, 'welcome-user', [ 'John Doe', 'Wikipedia', '2 hours ago' ] );
250 * mw.log( obj.text() );
251 * // Welcome back to Wikipedia, John Doe! Last visit by John Doe: 2 hours ago
253 * // Using mw.message shortcut
254 * obj = mw.message( 'hello-user', 'John Doe' );
255 * mw.log( obj.text() );
256 * // Hello, John Doe!
258 * // Using mw.msg shortcut
259 * str = mw.msg( 'hello-user', 'John Doe' );
261 * // Hello, John Doe!
263 * // Different formats
264 * obj = new mw.Message( mw.messages, 'hello-user', [ 'John "Wiki" <3 Doe' ] );
266 * obj.format = 'text';
267 * str = obj.toString();
272 * // Hello, John "Wiki" <3 Doe!
274 * mw.log( obj.escaped() );
275 * // Hello, John "Wiki" <3 Doe!
280 * @param {mw.Map} map Message store
281 * @param {string} key
282 * @param {Array} [parameters]
284 function Message( map
, key
, parameters
) {
285 this.format
= 'text';
288 this.parameters
= parameters
=== undefined ? [] : slice
.call( parameters
);
292 Message
.prototype = {
294 * Get parsed contents of the message.
296 * The default parser does simple $N replacements and nothing else.
297 * This may be overridden to provide a more complex message parser.
298 * The primary override is in the mediawiki.jqueryMsg module.
300 * This function will not be called for nonexistent messages.
302 * @return {string} Parsed message
304 parser: function () {
305 return mw
.format
.apply( null, [ this.map
.get( this.key
) ].concat( this.parameters
) );
309 * Add (does not replace) parameters for `$N` placeholder values.
311 * @param {Array} parameters
314 params: function ( parameters
) {
316 for ( i
= 0; i
< parameters
.length
; i
++ ) {
317 this.parameters
.push( parameters
[ i
] );
323 * Convert message object to its string form based on current format.
325 * @return {string} Message as a string in the current form, or `<key>` if key
328 toString: function () {
331 if ( !this.exists() ) {
332 // Use <key> as text if key does not exist
333 if ( this.format
=== 'escaped' || this.format
=== 'parse' ) {
334 // format 'escaped' and 'parse' need to have the brackets and key html escaped
335 return mw
.html
.escape( '<' + this.key
+ '>' );
337 return '<' + this.key
+ '>';
340 if ( this.format
=== 'plain' || this.format
=== 'text' || this.format
=== 'parse' ) {
341 text
= this.parser();
344 if ( this.format
=== 'escaped' ) {
345 text
= this.parser();
346 text
= mw
.html
.escape( text
);
353 * Change format to 'parse' and convert message to string
355 * If jqueryMsg is loaded, this parses the message text from wikitext
356 * (where supported) to HTML
358 * Otherwise, it is equivalent to plain.
360 * @return {string} String form of parsed message
363 this.format
= 'parse';
364 return this.toString();
368 * Change format to 'plain' and convert message to string
370 * This substitutes parameters, but otherwise does not change the
373 * @return {string} String form of plain message
376 this.format
= 'plain';
377 return this.toString();
381 * Change format to 'text' and convert message to string
383 * If jqueryMsg is loaded, {{-transformation is done where supported
384 * (such as {{plural:}}, {{gender:}}, {{int:}}).
386 * Otherwise, it is equivalent to plain
388 * @return {string} String form of text message
391 this.format
= 'text';
392 return this.toString();
396 * Change the format to 'escaped' and convert message to string
398 * This is equivalent to using the 'text' format (see #text), then
399 * HTML-escaping the output.
401 * @return {string} String form of html escaped message
403 escaped: function () {
404 this.format
= 'escaped';
405 return this.toString();
409 * Check if a message exists
414 exists: function () {
415 return this.map
.exists( this.key
);
425 * Get the current time, measured in milliseconds since January 1, 1970 (UTC).
427 * On browsers that implement the Navigation Timing API, this function will produce floating-point
428 * values with microsecond precision that are guaranteed to be monotonic. On all other browsers,
429 * it will fall back to using `Date`.
431 * @return {number} Current time
434 var perf
= window
.performance
,
435 navStart
= perf
&& perf
.timing
&& perf
.timing
.navigationStart
;
436 return navStart
&& typeof perf
.now
=== 'function' ?
437 function () { return navStart
+ perf
.now(); } :
438 function () { return +new Date(); };
442 * Format a string. Replace $1, $2 ... $N with positional arguments.
444 * Used by Message#parser().
447 * @param {string} formatString Format string
448 * @param {...Mixed} parameters Values for $N replacements
449 * @return {string} Formatted string
451 format: function ( formatString
) {
452 var parameters
= slice
.call( arguments
, 1 );
453 return formatString
.replace( /\$(\d+)/g, function ( str
, match
) {
454 var index
= parseInt( match
, 10 ) - 1;
455 return parameters
[ index
] !== undefined ? parameters
[ index
] : '$' + match
;
460 * Track an analytic event.
462 * This method provides a generic means for MediaWiki JavaScript code to capture state
463 * information for analysis. Each logged event specifies a string topic name that describes
464 * the kind of event that it is. Topic names consist of dot-separated path components,
465 * arranged from most general to most specific. Each path component should have a clear and
466 * well-defined purpose.
468 * Data handlers are registered via `mw.trackSubscribe`, and receive the full set of
469 * events that match their subcription, including those that fired before the handler was
472 * @param {string} topic Topic name
473 * @param {Object} [data] Data describing the event, encoded as an object
475 track: function ( topic
, data
) {
476 trackQueue
.push( { topic
: topic
, timeStamp
: mw
.now(), data
: data
} );
477 trackCallbacks
.fire( trackQueue
);
481 * Register a handler for subset of analytic events, specified by topic.
483 * Handlers will be called once for each tracked event, including any events that fired before the
484 * handler was registered; 'this' is set to a plain object with a 'timeStamp' property indicating
485 * the exact time at which the event fired, a string 'topic' property naming the event, and a
486 * 'data' property which is an object of event-specific data. The event topic and event data are
487 * also passed to the callback as the first and second arguments, respectively.
489 * @param {string} topic Handle events whose name starts with this string prefix
490 * @param {Function} callback Handler to call for each matching tracked event
491 * @param {string} callback.topic
492 * @param {Object} [callback.data]
494 trackSubscribe: function ( topic
, callback
) {
496 function handler( trackQueue
) {
498 for ( ; seen
< trackQueue
.length
; seen
++ ) {
499 event
= trackQueue
[ seen
];
500 if ( event
.topic
.indexOf( topic
) === 0 ) {
501 callback
.call( event
, event
.topic
, event
.data
);
506 trackHandlers
.push( [ handler
, callback
] );
508 trackCallbacks
.add( handler
);
512 * Stop handling events for a particular handler
514 * @param {Function} callback
516 trackUnsubscribe: function ( callback
) {
517 trackHandlers
= $.grep( trackHandlers
, function ( fns
) {
518 if ( fns
[ 1 ] === callback
) {
519 trackCallbacks
.remove( fns
[ 0 ] );
520 // Ensure the tuple is removed to avoid holding on to closures
527 // Expose Map constructor
530 // Expose Message constructor
534 * Map of configuration values.
536 * Check out [the complete list of configuration values](https://www.mediawiki.org/wiki/Manual:Interface/JavaScript#mw.config)
539 * If `$wgLegacyJavaScriptGlobals` is true, this Map will add its values to the
540 * global `window` object.
542 * @property {mw.Map} config
544 // Dummy placeholder later assigned in ResourceLoaderStartUpModule
548 * Empty object for third-party libraries, for cases where you don't
549 * want to add a new global, or the global is bad and needs containment
557 * Access container for deprecated functionality that can be moved from
558 * from their legacy location and attached to this object (e.g. a global
559 * function that is deprecated and as stop-gap can be exposed through here).
561 * This was reserved for future use but never ended up being used.
563 * @deprecated since 1.22 Let deprecated identifiers keep their original name
564 * and use mw.log#deprecate to create an access container for tracking.
570 * Store for messages.
577 * Store for templates associated with a module.
581 templates
: new Map(),
584 * Get a message object.
586 * Shortcut for `new mw.Message( mw.messages, key, parameters )`.
589 * @param {string} key Key of message to get
590 * @param {...Mixed} parameters Values for $N replacements
591 * @return {mw.Message}
593 message: function ( key
) {
594 var parameters
= slice
.call( arguments
, 1 );
595 return new Message( mw
.messages
, key
, parameters
);
599 * Get a message string using the (default) 'text' format.
601 * Shortcut for `mw.message( key, parameters... ).text()`.
604 * @param {string} key Key of message to get
605 * @param {...Mixed} parameters Values for $N replacements
609 return mw
.message
.apply( mw
.message
, arguments
).toString();
613 * Dummy placeholder for {@link mw.log}
618 // Also update the restoration of methods in mediawiki.log.js
619 // when adding or removing methods here.
620 var log = function () {},
621 console
= window
.console
;
629 * Write a message to the console's warning channel.
630 * Actions not supported by the browser console are silently ignored.
632 * @param {...string} msg Messages to output to console
634 log
.warn
= console
&& console
.warn
&& Function
.prototype.bind
?
635 Function
.prototype.bind
.call( console
.warn
, console
) :
639 * Write a message to the console's error channel.
641 * Most browsers provide a stacktrace by default if the argument
642 * is a caught Error object.
645 * @param {Error|...string} msg Messages to output to console
647 log
.error
= console
&& console
.error
&& Function
.prototype.bind
?
648 Function
.prototype.bind
.call( console
.error
, console
) :
652 * Create a property in a host object that, when accessed, will produce
653 * a deprecation warning in the console with backtrace.
655 * @param {Object} obj Host object of deprecated property
656 * @param {string} key Name of property to create in `obj`
657 * @param {Mixed} val The value this property should return when accessed
658 * @param {string} [msg] Optional text to include in the deprecation message
660 log
.deprecate
= !Object
.defineProperty
? function ( obj
, key
, val
) {
662 } : function ( obj
, key
, val
, msg
) {
664 msg
= 'Use of "' + key
+ '" is deprecated.' + ( msg
? ( ' ' + msg
) : '' );
665 var logged
, loggedIsSet
, uniqueTrace
;
673 uniqueTrace = function () {
674 var trace
= new Error().stack
;
676 if ( logged
.has( trace
) ) {
682 if ( logged
.hasOwnProperty( trace
) ) {
689 Object
.defineProperty( obj
, key
, {
693 if ( uniqueTrace() ) {
694 mw
.track( 'mw.deprecate', key
);
699 set: function ( newVal
) {
700 if ( uniqueTrace() ) {
701 mw
.track( 'mw.deprecate', key
);
714 * Client for ResourceLoader server end point.
716 * This client is in charge of maintaining the module registry and state
717 * machine, initiating network (batch) requests for loading modules, as
718 * well as dependency resolution and execution of source code.
720 * For more information, refer to
721 * <https://www.mediawiki.org/wiki/ResourceLoader/Features>
726 loader
: ( function () {
729 * Fired via mw.track on various resource loading errors.
731 * @event resourceloader_exception
732 * @param {Error|Mixed} e The error that was thrown. Almost always an Error
733 * object, but in theory module code could manually throw something else, and that
734 * might also end up here.
735 * @param {string} [module] Name of the module which caused the error. Omitted if the
736 * error is not module-related or the module cannot be easily identified due to
738 * @param {string} source Source of the error. Possible values:
740 * - style: stylesheet error (only affects old IE where a special style loading method
742 * - load-callback: exception thrown by user callback
743 * - module-execute: exception thrown by module code
744 * - store-eval: could not evaluate module code cached in localStorage
745 * - store-localstorage-init: localStorage or JSON parse error in mw.loader.store.init
746 * - store-localstorage-json: JSON conversion error in mw.loader.store.set
747 * - store-localstorage-update: localStorage or JSON conversion error in mw.loader.store.update
751 * Fired via mw.track on resource loading error conditions.
753 * @event resourceloader_assert
754 * @param {string} source Source of the error. Possible values:
756 * - bug-T59567: failed to cache script due to an Opera function -> string conversion
757 * bug; see <https://phabricator.wikimedia.org/T59567> for details
761 * Mapping of registered modules.
763 * See #implement and #execute for exact details on support for script, style and messages.
769 * // From mw.loader.register()
770 * 'version': '########' (hash)
771 * 'dependencies': ['required.foo', 'bar.also', ...], (or) function () {}
772 * 'group': 'somegroup', (or) null
773 * 'source': 'local', (or) 'anotherwiki'
774 * 'skip': 'return !!window.Example', (or) null
775 * 'module': export Object
777 * // Set from execute() or mw.loader.state()
778 * 'state': 'registered', 'loaded', 'loading', 'ready', 'error', or 'missing'
780 * // Optionally added at run-time by mw.loader.implement()
782 * 'script': closure, array of urls, or string
783 * 'style': { ... } (see #execute)
784 * 'messages': { 'key': 'value', ... }
791 * The module is known to the system but not yet requested.
792 * Meta data is registered via mw.loader#register. Calls to that method are
793 * generated server-side by the startup module.
795 * The module is requested through mw.loader (either directly or as dependency of
796 * another module). The client will be fetching module contents from the server.
797 * The contents are then stashed in the registry via mw.loader#implement.
799 * The module has been requested from the server and stashed via mw.loader#implement.
800 * If the module has no more dependencies in-fight, the module will be executed
801 * right away. Otherwise execution is deferred, controlled via #handlePending.
803 * The module is being executed.
805 * The module has been successfully executed.
807 * The module (or one of its dependencies) produced an error during execution.
809 * The module was registered client-side and requested, but the server denied knowledge
810 * of the module's existence.
816 // Mapping of sources, keyed by source-id, values are strings.
821 // 'sourceId': 'http://example.org/w/load.php'
826 // List of modules which will be loaded as when ready
829 // Pending queueModuleScript() requests
830 handlingPendingRequests
= false,
831 pendingRequests
= [],
833 // List of modules to be loaded
837 * List of callback jobs waiting for modules to be ready.
839 * Jobs are created by #request() and run by #handlePending().
841 * Typically when a job is created for a module, the job's dependencies contain
842 * both the module being requested and all its recursive dependencies.
847 * 'dependencies': [ module names ],
848 * 'ready': Function callback
849 * 'error': Function callback
852 * @property {Object[]} jobs
860 // For addEmbeddedCSS()
862 cssBufferTimer
= null,
863 cssCallbacks
= $.Callbacks(),
864 isIE9
= document
.documentMode
=== 9;
866 function getMarker() {
869 marker
= document
.querySelector( 'meta[name="ResourceLoaderDynamicStyles"]' );
871 mw
.log( 'Create <meta name="ResourceLoaderDynamicStyles"> dynamically' );
872 marker
= $( '<meta>' ).attr( 'name', 'ResourceLoaderDynamicStyles' ).appendTo( 'head' )[ 0 ];
879 * Create a new style element and add it to the DOM.
882 * @param {string} text CSS text
883 * @param {Node} [nextNode] The element where the style tag
884 * should be inserted before
885 * @return {HTMLElement} Reference to the created style element
887 function newStyleTag( text
, nextNode
) {
888 var s
= document
.createElement( 'style' );
890 s
.appendChild( document
.createTextNode( text
) );
891 if ( nextNode
&& nextNode
.parentNode
) {
892 nextNode
.parentNode
.insertBefore( s
, nextNode
);
894 document
.getElementsByTagName( 'head' )[ 0 ].appendChild( s
);
901 * Add a bit of CSS text to the current browser page.
903 * The CSS will be appended to an existing ResourceLoader-created `<style>` tag
904 * or create a new one based on whether the given `cssText` is safe for extension.
906 * @param {string} [cssText=cssBuffer] If called without cssText,
907 * the internal buffer will be inserted instead.
908 * @param {Function} [callback]
910 function addEmbeddedCSS( cssText
, callback
) {
913 function fireCallbacks() {
914 var oldCallbacks
= cssCallbacks
;
915 // Reset cssCallbacks variable so it's not polluted by any calls to
916 // addEmbeddedCSS() from one of the callbacks (T105973)
917 cssCallbacks
= $.Callbacks();
918 oldCallbacks
.fire().empty();
922 cssCallbacks
.add( callback
);
925 // Yield once before creating the <style> tag. This lets multiple stylesheets
926 // accumulate into one buffer, allowing us to reduce how often new stylesheets
927 // are inserted in the browser. Appending a stylesheet and waiting for the
928 // browser to repaint is fairly expensive. (T47810)
930 // Don't extend the buffer if the item needs its own stylesheet.
931 // Keywords like `@import` are only valid at the start of a stylesheet (T37562).
932 if ( !cssBuffer
|| cssText
.slice( 0, '@import'.length
) !== '@import' ) {
933 // Linebreak for somewhat distinguishable sections
934 cssBuffer
+= '\n' + cssText
;
935 // TODO: Using requestAnimationFrame would perform better by not injecting
936 // styles while the browser is busy painting.
937 if ( !cssBufferTimer
) {
938 cssBufferTimer
= setTimeout( function () {
939 // Support: Firefox < 13
940 // Firefox 12 has non-standard behaviour of passing a number
941 // as first argument to a setTimeout callback.
942 // http://benalman.com/news/2009/07/the-mysterious-firefox-settime/
949 // This is a scheduled flush for the buffer
951 cssBufferTimer
= null;
956 // By default, always create a new <style>. Appending text to a <style> tag is
957 // is a performance anti-pattern as it requires CSS to be reparsed (T47810).
960 // Try to re-use existing <style> tags due to the IE stylesheet limit (T33676).
962 $style
= $( getMarker() ).prev();
963 // Verify that the element before the marker actually is a <style> tag created
964 // by mw.loader (not some other style tag, or e.g. a <meta> tag).
965 if ( $style
.data( 'ResourceLoaderDynamicStyleTag' ) ) {
966 styleEl
= $style
[ 0 ];
967 styleEl
.appendChild( document
.createTextNode( cssText
) );
971 // Else: No existing tag to reuse. Continue below and create the first one.
974 $style
= $( newStyleTag( cssText
, getMarker() ) );
977 $style
.data( 'ResourceLoaderDynamicStyleTag', true );
985 * @param {Array} modules List of module names
986 * @return {string} Hash of concatenated version hashes.
988 function getCombinedVersion( modules
) {
989 var hashes
= $.map( modules
, function ( module
) {
990 return registry
[ module
].version
;
992 return fnv132( hashes
.join( '' ) );
996 * Determine whether all dependencies are in state 'ready', which means we may
997 * execute the module or job now.
1000 * @param {Array} modules Names of modules to be checked
1001 * @return {boolean} True if all modules are in state 'ready', false otherwise
1003 function allReady( modules
) {
1005 for ( i
= 0; i
< modules
.length
; i
++ ) {
1006 if ( mw
.loader
.getState( modules
[ i
] ) !== 'ready' ) {
1014 * Determine whether all dependencies are in state 'ready', which means we may
1015 * execute the module or job now.
1018 * @param {Array} modules Names of modules to be checked
1019 * @return {boolean} True if no modules are in state 'error' or 'missing', false otherwise
1021 function anyFailed( modules
) {
1023 for ( i
= 0; i
< modules
.length
; i
++ ) {
1024 state
= mw
.loader
.getState( modules
[ i
] );
1025 if ( state
=== 'error' || state
=== 'missing' ) {
1033 * A module has entered state 'ready', 'error', or 'missing'. Automatically update
1034 * pending jobs and modules that depend upon this module. If the given module failed,
1035 * propagate the 'error' state up the dependency tree. Otherwise, go ahead and execute
1036 * all jobs/modules now having their dependencies satisfied.
1038 * Jobs that depend on a failed module, will have their error callback ran (if any).
1041 * @param {string} module Name of module that entered one of the states 'ready', 'error', or 'missing'.
1043 function handlePending( module
) {
1044 var j
, job
, hasErrors
, m
, stateChange
;
1046 if ( registry
[ module
].state
=== 'error' || registry
[ module
].state
=== 'missing' ) {
1047 // If the current module failed, mark all dependent modules also as failed.
1048 // Iterate until steady-state to propagate the error state upwards in the
1051 stateChange
= false;
1052 for ( m
in registry
) {
1053 if ( registry
[ m
].state
!== 'error' && registry
[ m
].state
!== 'missing' ) {
1054 if ( anyFailed( registry
[ m
].dependencies
) ) {
1055 registry
[ m
].state
= 'error';
1060 } while ( stateChange
);
1063 // Execute all jobs whose dependencies are either all satisfied or contain at least one failed module.
1064 for ( j
= 0; j
< jobs
.length
; j
++ ) {
1065 hasErrors
= anyFailed( jobs
[ j
].dependencies
);
1066 if ( hasErrors
|| allReady( jobs
[ j
].dependencies
) ) {
1067 // All dependencies satisfied, or some have errors
1069 jobs
.splice( j
, 1 );
1073 if ( $.isFunction( job
.error
) ) {
1074 job
.error( new Error( 'Module ' + module
+ ' has failed dependencies' ), [ module
] );
1077 if ( $.isFunction( job
.ready
) ) {
1082 // A user-defined callback raised an exception.
1083 // Swallow it to protect our state machine!
1084 mw
.track( 'resourceloader.exception', { exception
: e
, module
: module
, source
: 'load-callback' } );
1089 if ( registry
[ module
].state
=== 'ready' ) {
1090 // The current module became 'ready'. Set it in the module store, and recursively execute all
1091 // dependent modules that are loaded and now have all dependencies satisfied.
1092 mw
.loader
.store
.set( module
, registry
[ module
] );
1093 for ( m
in registry
) {
1094 if ( registry
[ m
].state
=== 'loaded' && allReady( registry
[ m
].dependencies
) ) {
1102 * Resolve dependencies and detect circular references.
1105 * @param {string} module Name of the top-level module whose dependencies shall be
1106 * resolved and sorted.
1107 * @param {Array} resolved Returns a topological sort of the given module and its
1108 * dependencies, such that later modules depend on earlier modules. The array
1109 * contains the module names. If the array contains already some module names,
1110 * this function appends its result to the pre-existing array.
1111 * @param {Object} [unresolved] Hash used to track the current dependency
1112 * chain; used to report loops in the dependency graph.
1113 * @throws {Error} If any unregistered module or a dependency loop is encountered
1115 function sortDependencies( module
, resolved
, unresolved
) {
1118 if ( !hasOwn
.call( registry
, module
) ) {
1119 throw new Error( 'Unknown dependency: ' + module
);
1122 if ( registry
[ module
].skip
!== null ) {
1123 /*jshint evil:true */
1124 skip
= new Function( registry
[ module
].skip
);
1125 registry
[ module
].skip
= null;
1127 registry
[ module
].skipped
= true;
1128 registry
[ module
].dependencies
= [];
1129 registry
[ module
].state
= 'ready';
1130 handlePending( module
);
1135 // Resolves dynamic loader function and replaces it with its own results
1136 if ( $.isFunction( registry
[ module
].dependencies
) ) {
1137 registry
[ module
].dependencies
= registry
[ module
].dependencies();
1138 // Ensures the module's dependencies are always in an array
1139 if ( typeof registry
[ module
].dependencies
!== 'object' ) {
1140 registry
[ module
].dependencies
= [ registry
[ module
].dependencies
];
1143 if ( $.inArray( module
, resolved
) !== -1 ) {
1144 // Module already resolved; nothing to do
1147 // Create unresolved if not passed in
1148 if ( !unresolved
) {
1151 // Tracks down dependencies
1152 deps
= registry
[ module
].dependencies
;
1153 for ( i
= 0; i
< deps
.length
; i
++ ) {
1154 if ( $.inArray( deps
[ i
], resolved
) === -1 ) {
1155 if ( unresolved
[ deps
[ i
] ] ) {
1156 throw new Error( mw
.format(
1157 'Circular reference detected: $1 -> $2',
1163 // Add to unresolved
1164 unresolved
[ module
] = true;
1165 sortDependencies( deps
[ i
], resolved
, unresolved
);
1168 resolved
.push( module
);
1172 * Get names of module that a module depends on, in their proper dependency order.
1175 * @param {string[]} modules Array of string module names
1176 * @return {Array} List of dependencies, including 'module'.
1178 function resolve( modules
) {
1180 $.each( modules
, function ( idx
, module
) {
1181 sortDependencies( module
, resolved
);
1187 * Load and execute a script.
1190 * @param {string} src URL to script, will be used as the src attribute in the script tag
1191 * @return {jQuery.Promise}
1193 function addScript( src
) {
1197 // Force jQuery behaviour to be for crossDomain. Otherwise jQuery would use
1198 // XHR for a same domain request instead of <script>, which changes the request
1199 // headers (potentially missing a cache hit), and reduces caching in general
1200 // since browsers cache XHR much less (if at all). And XHR means we retreive
1201 // text, so we'd need to $.globalEval, which then messes up line numbers.
1208 * Queue the loading and execution of a script for a particular module.
1211 * @param {string} src URL of the script
1212 * @param {string} [moduleName] Name of currently executing module
1213 * @return {jQuery.Promise}
1215 function queueModuleScript( src
, moduleName
) {
1216 var r
= $.Deferred();
1218 pendingRequests
.push( function () {
1219 if ( moduleName
&& hasOwn
.call( registry
, moduleName
) ) {
1220 window
.require
= mw
.loader
.require
;
1221 window
.module
= registry
[ moduleName
].module
;
1223 addScript( src
).always( function () {
1224 // Clear environment
1225 delete window
.require
;
1226 delete window
.module
;
1229 // Start the next one (if any)
1230 if ( pendingRequests
[ 0 ] ) {
1231 pendingRequests
.shift()();
1233 handlingPendingRequests
= false;
1237 if ( !handlingPendingRequests
&& pendingRequests
[ 0 ] ) {
1238 handlingPendingRequests
= true;
1239 pendingRequests
.shift()();
1245 * Utility function for execute()
1249 function addLink( media
, url
) {
1250 var el
= document
.createElement( 'link' );
1252 el
.rel
= 'stylesheet';
1253 if ( media
&& media
!== 'all' ) {
1256 // If you end up here from an IE exception "SCRIPT: Invalid property value.",
1257 // see #addEmbeddedCSS, bug 31676, and bug 47277 for details.
1260 $( getMarker() ).before( el
);
1264 * Executes a loaded module, making it ready to use
1267 * @param {string} module Module name to execute
1269 function execute( module
) {
1270 var key
, value
, media
, i
, urls
, cssHandle
, checkCssHandles
, runScript
,
1271 cssHandlesRegistered
= false;
1273 if ( !hasOwn
.call( registry
, module
) ) {
1274 throw new Error( 'Module has not been registered yet: ' + module
);
1276 if ( registry
[ module
].state
!== 'loaded' ) {
1277 throw new Error( 'Module in state "' + registry
[ module
].state
+ '" may not be executed: ' + module
);
1280 registry
[ module
].state
= 'executing';
1282 runScript = function () {
1283 var script
, markModuleReady
, nestedAddScript
, legacyWait
,
1284 // Expand to include dependencies since we have to exclude both legacy modules
1285 // and their dependencies from the legacyWait (to prevent a circular dependency).
1286 legacyModules
= resolve( mw
.config
.get( 'wgResourceLoaderLegacyModules', [] ) );
1288 script
= registry
[ module
].script
;
1289 markModuleReady = function () {
1290 registry
[ module
].state
= 'ready';
1291 handlePending( module
);
1293 nestedAddScript = function ( arr
, callback
, i
) {
1294 // Recursively call queueModuleScript() in its own callback
1295 // for each element of arr.
1296 if ( i
>= arr
.length
) {
1297 // We're at the end of the array
1302 queueModuleScript( arr
[ i
], module
).always( function () {
1303 nestedAddScript( arr
, callback
, i
+ 1 );
1307 legacyWait
= ( $.inArray( module
, legacyModules
) !== -1 )
1308 ? $.Deferred().resolve()
1309 : mw
.loader
.using( legacyModules
);
1311 legacyWait
.always( function () {
1312 if ( $.isArray( script
) ) {
1313 nestedAddScript( script
, markModuleReady
, 0 );
1314 } else if ( $.isFunction( script
) ) {
1315 // Pass jQuery twice so that the signature of the closure which wraps
1316 // the script can bind both '$' and 'jQuery'.
1317 script( $, $, mw
.loader
.require
, registry
[ module
].module
);
1320 } else if ( typeof script
=== 'string' ) {
1321 // Site and user modules are legacy scripts that run in the global scope.
1322 // This is transported as a string instead of a function to avoid needing
1323 // to use string manipulation to undo the function wrapper.
1324 if ( module
=== 'user' ) {
1325 // Implicit dependency on the site module. Not real dependency because
1326 // it should run after 'site' regardless of whether it succeeds or fails.
1327 mw
.loader
.using( 'site' ).always( function () {
1328 $.globalEval( script
);
1332 $.globalEval( script
);
1336 // Module without script
1341 // This needs to NOT use mw.log because these errors are common in production mode
1342 // and not in debug mode, such as when a symbol that should be global isn't exported
1343 registry
[ module
].state
= 'error';
1344 mw
.track( 'resourceloader.exception', { exception
: e
, module
: module
, source
: 'module-execute' } );
1345 handlePending( module
);
1349 // Add localizations to message system
1350 if ( registry
[ module
].messages
) {
1351 mw
.messages
.set( registry
[ module
].messages
);
1354 // Initialise templates
1355 if ( registry
[ module
].templates
) {
1356 mw
.templates
.set( module
, registry
[ module
].templates
);
1359 // Make sure we don't run the scripts until all stylesheet insertions have completed.
1362 checkCssHandles = function () {
1363 // cssHandlesRegistered ensures we don't take off too soon, e.g. when
1364 // one of the cssHandles is fired while we're still creating more handles.
1365 if ( cssHandlesRegistered
&& pending
=== 0 && runScript
) {
1367 runScript
= undefined; // Revoke
1370 cssHandle = function () {
1371 var check
= checkCssHandles
;
1373 return function () {
1377 check
= undefined; // Revoke
1383 // Process styles (see also mw.loader.implement)
1384 // * back-compat: { <media>: css }
1385 // * back-compat: { <media>: [url, ..] }
1386 // * { "css": [css, ..] }
1387 // * { "url": { <media>: [url, ..] } }
1388 if ( registry
[ module
].style
) {
1389 for ( key
in registry
[ module
].style
) {
1390 value
= registry
[ module
].style
[ key
];
1393 if ( key
!== 'url' && key
!== 'css' ) {
1394 // Backwards compatibility, key is a media-type
1395 if ( typeof value
=== 'string' ) {
1396 // back-compat: { <media>: css }
1397 // Ignore 'media' because it isn't supported (nor was it used).
1398 // Strings are pre-wrapped in "@media". The media-type was just ""
1399 // (because it had to be set to something).
1400 // This is one of the reasons why this format is no longer used.
1401 addEmbeddedCSS( value
, cssHandle() );
1403 // back-compat: { <media>: [url, ..] }
1409 // Array of css strings in key 'css',
1410 // or back-compat array of urls from media-type
1411 if ( $.isArray( value
) ) {
1412 for ( i
= 0; i
< value
.length
; i
++ ) {
1413 if ( key
=== 'bc-url' ) {
1414 // back-compat: { <media>: [url, ..] }
1415 addLink( media
, value
[ i
] );
1416 } else if ( key
=== 'css' ) {
1417 // { "css": [css, ..] }
1418 addEmbeddedCSS( value
[ i
], cssHandle() );
1421 // Not an array, but a regular object
1422 // Array of urls inside media-type key
1423 } else if ( typeof value
=== 'object' ) {
1424 // { "url": { <media>: [url, ..] } }
1425 for ( media
in value
) {
1426 urls
= value
[ media
];
1427 for ( i
= 0; i
< urls
.length
; i
++ ) {
1428 addLink( media
, urls
[ i
] );
1436 cssHandlesRegistered
= true;
1441 * Adds all dependencies to the queue with optional callbacks to be run
1442 * when the dependencies are ready or fail
1445 * @param {string|string[]} dependencies Module name or array of string module names
1446 * @param {Function} [ready] Callback to execute when all dependencies are ready
1447 * @param {Function} [error] Callback to execute when any dependency fails
1449 function request( dependencies
, ready
, error
) {
1450 // Allow calling by single module name
1451 if ( typeof dependencies
=== 'string' ) {
1452 dependencies
= [ dependencies
];
1455 // Add ready and error callbacks if they were given
1456 if ( ready
!== undefined || error
!== undefined ) {
1458 // Narrow down the list to modules that are worth waiting for
1459 dependencies
: $.grep( dependencies
, function ( module
) {
1460 var state
= mw
.loader
.getState( module
);
1461 return state
=== 'registered' || state
=== 'loaded' || state
=== 'loading' || state
=== 'executing';
1468 $.each( dependencies
, function ( idx
, module
) {
1469 var state
= mw
.loader
.getState( module
);
1470 // Only queue modules that are still in the initial 'registered' state
1471 // (not ones already loading, ready or error).
1472 if ( state
=== 'registered' && $.inArray( module
, queue
) === -1 ) {
1473 // Private modules must be embedded in the page. Don't bother queuing
1474 // these as the server will deny them anyway (T101806).
1475 if ( registry
[ module
].group
=== 'private' ) {
1476 registry
[ module
].state
= 'error';
1477 handlePending( module
);
1480 queue
.push( module
);
1487 function sortQuery( o
) {
1493 if ( hasOwn
.call( o
, key
) ) {
1498 for ( key
= 0; key
< a
.length
; key
++ ) {
1499 sorted
[ a
[ key
] ] = o
[ a
[ key
] ];
1505 * Converts a module map of the form { foo: [ 'bar', 'baz' ], bar: [ 'baz, 'quux' ] }
1506 * to a query string of the form foo.bar,baz|bar.baz,quux
1510 function buildModulesString( moduleMap
) {
1514 for ( prefix
in moduleMap
) {
1515 p
= prefix
=== '' ? '' : prefix
+ '.';
1516 arr
.push( p
+ moduleMap
[ prefix
].join( ',' ) );
1518 return arr
.join( '|' );
1522 * Load modules from load.php
1525 * @param {Object} moduleMap Module map, see #buildModulesString
1526 * @param {Object} currReqBase Object with other parameters (other than 'modules') to use in the request
1527 * @param {string} sourceLoadScript URL of load.php
1529 function doRequest( moduleMap
, currReqBase
, sourceLoadScript
) {
1530 var request
= $.extend(
1531 { modules
: buildModulesString( moduleMap
) },
1534 request
= sortQuery( request
);
1535 addScript( sourceLoadScript
+ '?' + $.param( request
) );
1539 * Resolve indexed dependencies.
1541 * ResourceLoader uses an optimization to save space which replaces module names in
1542 * dependency lists with the index of that module within the array of module
1543 * registration data if it exists. The benefit is a significant reduction in the data
1544 * size of the startup module. This function changes those dependency lists back to
1545 * arrays of strings.
1547 * @param {Array} modules Modules array
1549 function resolveIndexedDependencies( modules
) {
1550 $.each( modules
, function ( idx
, module
) {
1551 if ( module
[ 2 ] ) {
1552 module
[ 2 ] = $.map( module
[ 2 ], function ( dep
) {
1553 return typeof dep
=== 'number' ? modules
[ dep
][ 0 ] : dep
;
1559 /* Public Members */
1562 * The module registry is exposed as an aid for debugging and inspecting page
1563 * state; it is not a public interface for modifying the registry.
1569 moduleRegistry
: registry
,
1572 * @inheritdoc #newStyleTag
1575 addStyleTag
: newStyleTag
,
1578 * Batch-request queued dependencies from the server.
1581 var reqBase
, splits
, maxQueryLength
, q
, b
, bSource
, bGroup
, bSourceGroup
,
1582 source
, concatSource
, origBatch
, group
, i
, modules
, sourceLoadScript
,
1583 currReqBase
, currReqBaseLength
, moduleMap
, l
,
1584 lastDotIndex
, prefix
, suffix
, bytesAdded
;
1586 // Build a list of request parameters common to all requests.
1588 skin
: mw
.config
.get( 'skin' ),
1589 lang
: mw
.config
.get( 'wgUserLanguage' ),
1590 debug
: mw
.config
.get( 'debug' )
1592 // Split module batch by source and by group.
1594 maxQueryLength
= mw
.config
.get( 'wgResourceLoaderMaxQueryLength', 2000 );
1596 // Appends a list of modules from the queue to the batch
1597 for ( q
= 0; q
< queue
.length
; q
++ ) {
1598 // Only request modules which are registered
1599 if ( hasOwn
.call( registry
, queue
[ q
] ) && registry
[ queue
[ q
] ].state
=== 'registered' ) {
1600 // Prevent duplicate entries
1601 if ( $.inArray( queue
[ q
], batch
) === -1 ) {
1602 batch
.push( queue
[ q
] );
1603 // Mark registered modules as loading
1604 registry
[ queue
[ q
] ].state
= 'loading';
1609 mw
.loader
.store
.init();
1610 if ( mw
.loader
.store
.enabled
) {
1613 batch
= $.grep( batch
, function ( module
) {
1614 var source
= mw
.loader
.store
.get( module
);
1616 concatSource
.push( source
);
1622 $.globalEval( concatSource
.join( ';' ) );
1624 // Not good, the cached mw.loader.implement calls failed! This should
1625 // never happen, barring ResourceLoader bugs, browser bugs and PEBKACs.
1626 // Depending on how corrupt the string is, it is likely that some
1627 // modules' implement() succeeded while the ones after the error will
1628 // never run and leave their modules in the 'loading' state forever.
1630 // Since this is an error not caused by an individual module but by
1631 // something that infected the implement call itself, don't take any
1632 // risks and clear everything in this cache.
1633 mw
.loader
.store
.clear();
1634 // Re-add the ones still pending back to the batch and let the server
1635 // repopulate these modules to the cache.
1636 // This means that at most one module will be useless (the one that had
1637 // the error) instead of all of them.
1638 mw
.track( 'resourceloader.exception', { exception
: err
, source
: 'store-eval' } );
1639 origBatch
= $.grep( origBatch
, function ( module
) {
1640 return registry
[ module
].state
=== 'loading';
1642 batch
= batch
.concat( origBatch
);
1646 // Early exit if there's nothing to load...
1647 if ( !batch
.length
) {
1651 // The queue has been processed into the batch, clear up the queue.
1654 // Always order modules alphabetically to help reduce cache
1655 // misses for otherwise identical content.
1658 // Split batch by source and by group.
1659 for ( b
= 0; b
< batch
.length
; b
++ ) {
1660 bSource
= registry
[ batch
[ b
] ].source
;
1661 bGroup
= registry
[ batch
[ b
] ].group
;
1662 if ( !hasOwn
.call( splits
, bSource
) ) {
1663 splits
[ bSource
] = {};
1665 if ( !hasOwn
.call( splits
[ bSource
], bGroup
) ) {
1666 splits
[ bSource
][ bGroup
] = [];
1668 bSourceGroup
= splits
[ bSource
][ bGroup
];
1669 bSourceGroup
.push( batch
[ b
] );
1672 // Clear the batch - this MUST happen before we append any
1673 // script elements to the body or it's possible that a script
1674 // will be locally cached, instantly load, and work the batch
1675 // again, all before we've cleared it causing each request to
1676 // include modules which are already loaded.
1679 for ( source
in splits
) {
1681 sourceLoadScript
= sources
[ source
];
1683 for ( group
in splits
[ source
] ) {
1685 // Cache access to currently selected list of
1686 // modules for this group from this source.
1687 modules
= splits
[ source
][ group
];
1689 currReqBase
= $.extend( {
1690 version
: getCombinedVersion( modules
)
1692 // For user modules append a user name to the request.
1693 if ( group
=== 'user' && mw
.config
.get( 'wgUserName' ) !== null ) {
1694 currReqBase
.user
= mw
.config
.get( 'wgUserName' );
1696 currReqBaseLength
= $.param( currReqBase
).length
;
1697 // We may need to split up the request to honor the query string length limit,
1698 // so build it piece by piece.
1699 l
= currReqBaseLength
+ 9; // '&modules='.length == 9
1701 moduleMap
= {}; // { prefix: [ suffixes ] }
1703 for ( i
= 0; i
< modules
.length
; i
++ ) {
1704 // Determine how many bytes this module would add to the query string
1705 lastDotIndex
= modules
[ i
].lastIndexOf( '.' );
1707 // If lastDotIndex is -1, substr() returns an empty string
1708 prefix
= modules
[ i
].substr( 0, lastDotIndex
);
1709 suffix
= modules
[ i
].slice( lastDotIndex
+ 1 );
1711 bytesAdded
= hasOwn
.call( moduleMap
, prefix
)
1712 ? suffix
.length
+ 3 // '%2C'.length == 3
1713 : modules
[ i
].length
+ 3; // '%7C'.length == 3
1715 // If the request would become too long, create a new one,
1716 // but don't create empty requests
1717 if ( maxQueryLength
> 0 && !$.isEmptyObject( moduleMap
) && l
+ bytesAdded
> maxQueryLength
) {
1718 // This request would become too long, create a new one
1719 // and fire off the old one
1720 doRequest( moduleMap
, currReqBase
, sourceLoadScript
);
1722 l
= currReqBaseLength
+ 9;
1723 mw
.track( 'resourceloader.splitRequest', { maxQueryLength
: maxQueryLength
} );
1725 if ( !hasOwn
.call( moduleMap
, prefix
) ) {
1726 moduleMap
[ prefix
] = [];
1728 moduleMap
[ prefix
].push( suffix
);
1731 // If there's anything left in moduleMap, request that too
1732 if ( !$.isEmptyObject( moduleMap
) ) {
1733 doRequest( moduleMap
, currReqBase
, sourceLoadScript
);
1740 * Register a source.
1742 * The #work() method will use this information to split up requests by source.
1744 * mw.loader.addSource( 'mediawikiwiki', '//www.mediawiki.org/w/load.php' );
1746 * @param {string|Object} id Source ID, or object mapping ids to load urls
1747 * @param {string} loadUrl Url to a load.php end point
1748 * @throws {Error} If source id is already registered
1750 addSource: function ( id
, loadUrl
) {
1752 // Allow multiple additions
1753 if ( typeof id
=== 'object' ) {
1754 for ( source
in id
) {
1755 mw
.loader
.addSource( source
, id
[ source
] );
1760 if ( hasOwn
.call( sources
, id
) ) {
1761 throw new Error( 'source already registered: ' + id
);
1764 sources
[ id
] = loadUrl
;
1768 * Register a module, letting the system know about it and its properties.
1770 * The startup modules contain calls to this method.
1772 * When using multiple module registration by passing an array, dependencies that
1773 * are specified as references to modules within the array will be resolved before
1774 * the modules are registered.
1776 * @param {string|Array} module Module name or array of arrays, each containing
1777 * a list of arguments compatible with this method
1778 * @param {string|number} version Module version hash (falls backs to empty string)
1779 * Can also be a number (timestamp) for compatibility with MediaWiki 1.25 and earlier.
1780 * @param {string|Array|Function} dependencies One string or array of strings of module
1781 * names on which this module depends, or a function that returns that array.
1782 * @param {string} [group=null] Group which the module is in
1783 * @param {string} [source='local'] Name of the source
1784 * @param {string} [skip=null] Script body of the skip function
1786 register: function ( module
, version
, dependencies
, group
, source
, skip
) {
1788 // Allow multiple registration
1789 if ( typeof module
=== 'object' ) {
1790 resolveIndexedDependencies( module
);
1791 for ( i
= 0; i
< module
.length
; i
++ ) {
1792 // module is an array of module names
1793 if ( typeof module
[ i
] === 'string' ) {
1794 mw
.loader
.register( module
[ i
] );
1795 // module is an array of arrays
1796 } else if ( typeof module
[ i
] === 'object' ) {
1797 mw
.loader
.register
.apply( mw
.loader
, module
[ i
] );
1802 if ( hasOwn
.call( registry
, module
) ) {
1803 throw new Error( 'module already registered: ' + module
);
1805 // List the module as registered
1806 registry
[ module
] = {
1807 // Exposed to execute() for mw.loader.implement() closures.
1808 // Import happens via require().
1812 version
: version
!== undefined ? String( version
) : '',
1814 group
: typeof group
=== 'string' ? group
: null,
1815 source
: typeof source
=== 'string' ? source
: 'local',
1816 state
: 'registered',
1817 skip
: typeof skip
=== 'string' ? skip
: null
1819 if ( typeof dependencies
=== 'string' ) {
1820 // Allow dependencies to be given as a single module name
1821 registry
[ module
].dependencies
= [ dependencies
];
1822 } else if ( typeof dependencies
=== 'object' || $.isFunction( dependencies
) ) {
1823 // Allow dependencies to be given as an array of module names
1824 // or a function which returns an array
1825 registry
[ module
].dependencies
= dependencies
;
1830 * Implement a module given the components that make up the module.
1832 * When #load or #using requests one or more modules, the server
1833 * response contain calls to this function.
1835 * @param {string} module Name of module
1836 * @param {Function|Array} [script] Function with module code or Array of URLs to
1837 * be used as the src attribute of a new `<script>` tag.
1838 * @param {Object} [style] Should follow one of the following patterns:
1840 * { "css": [css, ..] }
1841 * { "url": { <media>: [url, ..] } }
1843 * And for backwards compatibility (needs to be supported forever due to caching):
1846 * { <media>: [url, ..] }
1848 * The reason css strings are not concatenated anymore is bug 31676. We now check
1849 * whether it's safe to extend the stylesheet.
1851 * @param {Object} [messages] List of key/value pairs to be added to mw#messages.
1852 * @param {Object} [templates] List of key/value pairs to be added to mw#templates.
1854 implement: function ( module
, script
, style
, messages
, templates
) {
1855 // Automatically register module
1856 if ( !hasOwn
.call( registry
, module
) ) {
1857 mw
.loader
.register( module
);
1859 // Check for duplicate implementation
1860 if ( hasOwn
.call( registry
, module
) && registry
[ module
].script
!== undefined ) {
1861 throw new Error( 'module already implemented: ' + module
);
1863 // Attach components
1864 registry
[ module
].script
= script
|| null;
1865 registry
[ module
].style
= style
|| null;
1866 registry
[ module
].messages
= messages
|| null;
1867 registry
[ module
].templates
= templates
|| null;
1868 // The module may already have been marked as erroneous
1869 if ( $.inArray( registry
[ module
].state
, [ 'error', 'missing' ] ) === -1 ) {
1870 registry
[ module
].state
= 'loaded';
1871 if ( allReady( registry
[ module
].dependencies
) ) {
1878 * Execute a function as soon as one or more required modules are ready.
1880 * Example of inline dependency on OOjs:
1882 * mw.loader.using( 'oojs', function () {
1883 * OO.compare( [ 1 ], [ 1 ] );
1886 * @param {string|Array} dependencies Module name or array of modules names the
1887 * callback depends on to be ready before executing
1888 * @param {Function} [ready] Callback to execute when all dependencies are ready
1889 * @param {Function} [error] Callback to execute if one or more dependencies failed
1890 * @return {jQuery.Promise}
1891 * @since 1.23 this returns a promise
1893 using: function ( dependencies
, ready
, error
) {
1894 var deferred
= $.Deferred();
1896 // Allow calling with a single dependency as a string
1897 if ( typeof dependencies
=== 'string' ) {
1898 dependencies
= [ dependencies
];
1902 deferred
.done( ready
);
1905 deferred
.fail( error
);
1908 // Resolve entire dependency map
1909 dependencies
= resolve( dependencies
);
1910 if ( allReady( dependencies
) ) {
1911 // Run ready immediately
1913 } else if ( anyFailed( dependencies
) ) {
1914 // Execute error immediately if any dependencies have errors
1916 new Error( 'One or more dependencies failed to load' ),
1920 // Not all dependencies are ready: queue up a request
1921 request( dependencies
, deferred
.resolve
, deferred
.reject
);
1924 return deferred
.promise();
1928 * Load an external script or one or more modules.
1930 * @param {string|Array} modules Either the name of a module, array of modules,
1931 * or a URL of an external script or style
1932 * @param {string} [type='text/javascript'] MIME type to use if calling with a URL of an
1933 * external script or style; acceptable values are "text/css" and
1934 * "text/javascript"; if no type is provided, text/javascript is assumed.
1936 load: function ( modules
, type
) {
1939 // Allow calling with a url or single dependency as a string
1940 if ( typeof modules
=== 'string' ) {
1941 // "https://example.org/x.js", "http://example.org/x.js", "//example.org/x.js", "/x.js"
1942 if ( /^(https?:)?\/?\//.test( modules
) ) {
1943 if ( type
=== 'text/css' ) {
1945 // Use properties instead of attributes as IE throws security
1946 // warnings when inserting a <link> tag with a protocol-relative
1947 // URL set though attributes - when on HTTPS. See bug 41331.
1948 l
= document
.createElement( 'link' );
1949 l
.rel
= 'stylesheet';
1951 $( 'head' ).append( l
);
1954 if ( type
=== 'text/javascript' || type
=== undefined ) {
1955 addScript( modules
);
1959 throw new Error( 'invalid type for external url, must be text/css or text/javascript. not ' + type
);
1961 // Called with single module
1962 modules
= [ modules
];
1965 // Filter out undefined modules, otherwise resolve() will throw
1966 // an exception for trying to load an undefined module.
1967 // Undefined modules are acceptable here in load(), because load() takes
1968 // an array of unrelated modules, whereas the modules passed to
1969 // using() are related and must all be loaded.
1970 filtered
= $.grep( modules
, function ( module
) {
1971 var state
= mw
.loader
.getState( module
);
1972 return state
!== null && state
!== 'error' && state
!== 'missing';
1975 if ( filtered
.length
=== 0 ) {
1978 // Resolve entire dependency map
1979 filtered
= resolve( filtered
);
1980 // If all modules are ready, or if any modules have errors, nothing to be done.
1981 if ( allReady( filtered
) || anyFailed( filtered
) ) {
1984 // Since some modules are not yet ready, queue up a request.
1985 request( filtered
, undefined, undefined );
1989 * Change the state of one or more modules.
1991 * @param {string|Object} module Module name or object of module name/state pairs
1992 * @param {string} state State name
1994 state: function ( module
, state
) {
1997 if ( typeof module
=== 'object' ) {
1998 for ( m
in module
) {
1999 mw
.loader
.state( m
, module
[ m
] );
2003 if ( !hasOwn
.call( registry
, module
) ) {
2004 mw
.loader
.register( module
);
2006 if ( $.inArray( state
, [ 'ready', 'error', 'missing' ] ) !== -1
2007 && registry
[ module
].state
!== state
) {
2008 // Make sure pending modules depending on this one get executed if their
2009 // dependencies are now fulfilled!
2010 registry
[ module
].state
= state
;
2011 handlePending( module
);
2013 registry
[ module
].state
= state
;
2018 * Get the version of a module.
2020 * @param {string} module Name of module
2021 * @return {string|null} The version, or null if the module (or its version) is not
2024 getVersion: function ( module
) {
2025 if ( !hasOwn
.call( registry
, module
) || registry
[ module
].version
=== undefined ) {
2028 return registry
[ module
].version
;
2032 * Get the state of a module.
2034 * @param {string} module Name of module
2035 * @return {string|null} The state, or null if the module (or its state) is not
2038 getState: function ( module
) {
2039 if ( !hasOwn
.call( registry
, module
) || registry
[ module
].state
=== undefined ) {
2042 return registry
[ module
].state
;
2046 * Get the names of all registered modules.
2050 getModuleNames: function () {
2051 return $.map( registry
, function ( i
, key
) {
2057 * Get the exported value of a module.
2059 * Module provide this value via their local `module.exports`.
2064 require: function ( moduleName
) {
2065 var state
= mw
.loader
.getState( moduleName
);
2067 // Only ready modules can be required
2068 if ( state
!== 'ready' ) {
2069 // Module may've forgotten to declare a dependency
2070 throw new Error( 'Module "' + moduleName
+ '" is not loaded.' );
2073 return registry
[ moduleName
].module
.exports
;
2077 * @inheritdoc mw.inspect#runReports
2080 inspect: function () {
2081 var args
= slice
.call( arguments
);
2082 mw
.loader
.using( 'mediawiki.inspect', function () {
2083 mw
.inspect
.runReports
.apply( mw
.inspect
, args
);
2088 * On browsers that implement the localStorage API, the module store serves as a
2089 * smart complement to the browser cache. Unlike the browser cache, the module store
2090 * can slice a concatenated response from ResourceLoader into its constituent
2091 * modules and cache each of them separately, using each module's versioning scheme
2092 * to determine when the cache should be invalidated.
2095 * @class mw.loader.store
2098 // Whether the store is in use on this page.
2101 MODULE_SIZE_MAX
: 100 * 1000,
2103 // The contents of the store, mapping '[module name]@[version]' keys
2104 // to module implementations.
2108 stats
: { hits
: 0, misses
: 0, expired
: 0 },
2111 * Construct a JSON-serializable object representing the content of the store.
2113 * @return {Object} Module store contents.
2115 toJSON: function () {
2116 return { items
: mw
.loader
.store
.items
, vary
: mw
.loader
.store
.getVary() };
2120 * Get the localStorage key for the entire module store. The key references
2121 * $wgDBname to prevent clashes between wikis which share a common host.
2123 * @return {string} localStorage item key
2125 getStoreKey: function () {
2126 return 'MediaWikiModuleStore:' + mw
.config
.get( 'wgDBname' );
2130 * Get a key on which to vary the module cache.
2132 * @return {string} String of concatenated vary conditions.
2134 getVary: function () {
2136 mw
.config
.get( 'skin' ),
2137 mw
.config
.get( 'wgResourceLoaderStorageVersion' ),
2138 mw
.config
.get( 'wgUserLanguage' )
2143 * Get a key for a specific module. The key format is '[name]@[version]'.
2145 * @param {string} module Module name
2146 * @return {string|null} Module key or null if module does not exist
2148 getModuleKey: function ( module
) {
2149 return hasOwn
.call( registry
, module
) ?
2150 ( module
+ '@' + registry
[ module
].version
) : null;
2154 * Initialize the store.
2156 * Retrieves store from localStorage and (if successfully retrieved) decoding
2157 * the stored JSON value to a plain object.
2159 * The try / catch block is used for JSON & localStorage feature detection.
2160 * See the in-line documentation for Modernizr's localStorage feature detection
2161 * code for a full account of why we need a try / catch:
2162 * <https://github.com/Modernizr/Modernizr/blob/v2.7.1/modernizr.js#L771-L796>.
2167 if ( mw
.loader
.store
.enabled
!== null ) {
2173 // Disabled because localStorage quotas are tight and (in Firefox's case)
2174 // shared by multiple origins.
2175 // See T66721, and <https://bugzilla.mozilla.org/show_bug.cgi?id=1064466>.
2176 /Firefox|Opera/.test( navigator
.userAgent
) ||
2178 // Disabled by configuration.
2179 !mw
.config
.get( 'wgResourceLoaderStorageEnabled' )
2181 // Clear any previous store to free up space. (T66721)
2182 mw
.loader
.store
.clear();
2183 mw
.loader
.store
.enabled
= false;
2186 if ( mw
.config
.get( 'debug' ) ) {
2187 // Disable module store in debug mode
2188 mw
.loader
.store
.enabled
= false;
2193 raw
= localStorage
.getItem( mw
.loader
.store
.getStoreKey() );
2194 // If we get here, localStorage is available; mark enabled
2195 mw
.loader
.store
.enabled
= true;
2196 data
= JSON
.parse( raw
);
2197 if ( data
&& typeof data
.items
=== 'object' && data
.vary
=== mw
.loader
.store
.getVary() ) {
2198 mw
.loader
.store
.items
= data
.items
;
2202 mw
.track( 'resourceloader.exception', { exception
: e
, source
: 'store-localstorage-init' } );
2205 if ( raw
=== undefined ) {
2206 // localStorage failed; disable store
2207 mw
.loader
.store
.enabled
= false;
2209 mw
.loader
.store
.update();
2214 * Retrieve a module from the store and update cache hit stats.
2216 * @param {string} module Module name
2217 * @return {string|boolean} Module implementation or false if unavailable
2219 get: function ( module
) {
2222 if ( !mw
.loader
.store
.enabled
) {
2226 key
= mw
.loader
.store
.getModuleKey( module
);
2227 if ( key
in mw
.loader
.store
.items
) {
2228 mw
.loader
.store
.stats
.hits
++;
2229 return mw
.loader
.store
.items
[ key
];
2231 mw
.loader
.store
.stats
.misses
++;
2236 * Stringify a module and queue it for storage.
2238 * @param {string} module Module name
2239 * @param {Object} descriptor The module's descriptor as set in the registry
2241 set: function ( module
, descriptor
) {
2244 if ( !mw
.loader
.store
.enabled
) {
2248 key
= mw
.loader
.store
.getModuleKey( module
);
2251 // Already stored a copy of this exact version
2252 key
in mw
.loader
.store
.items
||
2253 // Module failed to load
2254 descriptor
.state
!== 'ready' ||
2255 // Unversioned, private, or site-/user-specific
2256 ( !descriptor
.version
|| $.inArray( descriptor
.group
, [ 'private', 'user' ] ) !== -1 ) ||
2257 // Partial descriptor
2258 $.inArray( undefined, [ descriptor
.script
, descriptor
.style
,
2259 descriptor
.messages
, descriptor
.templates
] ) !== -1
2267 JSON
.stringify( module
),
2268 typeof descriptor
.script
=== 'function' ?
2269 String( descriptor
.script
) :
2270 JSON
.stringify( descriptor
.script
),
2271 JSON
.stringify( descriptor
.style
),
2272 JSON
.stringify( descriptor
.messages
),
2273 JSON
.stringify( descriptor
.templates
)
2275 // Attempted workaround for a possible Opera bug (bug T59567).
2276 // This regex should never match under sane conditions.
2277 if ( /^\s*\(/.test( args
[ 1 ] ) ) {
2278 args
[ 1 ] = 'function' + args
[ 1 ];
2279 mw
.track( 'resourceloader.assert', { source
: 'bug-T59567' } );
2282 mw
.track( 'resourceloader.exception', { exception
: e
, source
: 'store-localstorage-json' } );
2286 src
= 'mw.loader.implement(' + args
.join( ',' ) + ');';
2287 if ( src
.length
> mw
.loader
.store
.MODULE_SIZE_MAX
) {
2290 mw
.loader
.store
.items
[ key
] = src
;
2291 mw
.loader
.store
.update();
2295 * Iterate through the module store, removing any item that does not correspond
2296 * (in name and version) to an item in the module registry.
2298 prune: function () {
2301 if ( !mw
.loader
.store
.enabled
) {
2305 for ( key
in mw
.loader
.store
.items
) {
2306 module
= key
.slice( 0, key
.indexOf( '@' ) );
2307 if ( mw
.loader
.store
.getModuleKey( module
) !== key
) {
2308 mw
.loader
.store
.stats
.expired
++;
2309 delete mw
.loader
.store
.items
[ key
];
2310 } else if ( mw
.loader
.store
.items
[ key
].length
> mw
.loader
.store
.MODULE_SIZE_MAX
) {
2311 // This value predates the enforcement of a size limit on cached modules.
2312 delete mw
.loader
.store
.items
[ key
];
2318 * Clear the entire module store right now.
2320 clear: function () {
2321 mw
.loader
.store
.items
= {};
2323 localStorage
.removeItem( mw
.loader
.store
.getStoreKey() );
2324 } catch ( ignored
) {}
2328 * Sync in-memory store back to localStorage.
2330 * This function debounces updates. When called with a flush already pending,
2331 * the call is coalesced into the pending update. The call to
2332 * localStorage.setItem will be naturally deferred until the page is quiescent.
2334 * Because localStorage is shared by all pages from the same origin, if multiple
2335 * pages are loaded with different module sets, the possibility exists that
2336 * modules saved by one page will be clobbered by another. But the impact would
2337 * be minor and the problem would be corrected by subsequent page views.
2341 update
: ( function () {
2342 var hasPendingWrite
= false;
2344 function flushWrites() {
2346 if ( !hasPendingWrite
|| !mw
.loader
.store
.enabled
) {
2350 mw
.loader
.store
.prune();
2351 key
= mw
.loader
.store
.getStoreKey();
2353 // Replacing the content of the module store might fail if the new
2354 // contents would exceed the browser's localStorage size limit. To
2355 // avoid clogging the browser with stale data, always remove the old
2356 // value before attempting to set the new one.
2357 localStorage
.removeItem( key
);
2358 data
= JSON
.stringify( mw
.loader
.store
);
2359 localStorage
.setItem( key
, data
);
2361 mw
.track( 'resourceloader.exception', { exception
: e
, source
: 'store-localstorage-update' } );
2364 hasPendingWrite
= false;
2367 return function () {
2368 if ( !hasPendingWrite
) {
2369 hasPendingWrite
= true;
2370 mw
.requestIdleCallback( flushWrites
);
2379 * HTML construction helper functions
2386 * output = Html.element( 'div', {}, new Html.Raw(
2387 * Html.element( 'img', { src: '<' } )
2389 * mw.log( output ); // <div><img src="<"/></div>
2394 html
: ( function () {
2395 function escapeCallback( s
) {
2412 * Escape a string for HTML.
2414 * Converts special characters to HTML entities.
2416 * mw.html.escape( '< > \' & "' );
2417 * // Returns < > ' & "
2419 * @param {string} s The string to escape
2420 * @return {string} HTML
2422 escape: function ( s
) {
2423 return s
.replace( /['"<>&]/g, escapeCallback
);
2427 * Create an HTML element string, with safe escaping.
2429 * @param {string} name The tag name.
2430 * @param {Object} [attrs] An object with members mapping element names to values
2431 * @param {string|mw.html.Raw|mw.html.Cdata|null} [contents=null] The contents of the element.
2433 * - string: Text to be escaped.
2434 * - null: The element is treated as void with short closing form, e.g. `<br/>`.
2435 * - this.Raw: The raw value is directly included.
2436 * - this.Cdata: The raw value is directly included. An exception is
2437 * thrown if it contains any illegal ETAGO delimiter.
2438 * See <http://www.w3.org/TR/html401/appendix/notes.html#h-B.3.2>.
2439 * @return {string} HTML
2441 element: function ( name
, attrs
, contents
) {
2442 var v
, attrName
, s
= '<' + name
;
2445 for ( attrName
in attrs
) {
2446 v
= attrs
[ attrName
];
2447 // Convert name=true, to name=name
2451 } else if ( v
=== false ) {
2454 s
+= ' ' + attrName
+ '="' + this.escape( String( v
) ) + '"';
2457 if ( contents
=== undefined || contents
=== null ) {
2464 switch ( typeof contents
) {
2467 s
+= this.escape( contents
);
2471 // Convert to string
2472 s
+= String( contents
);
2475 if ( contents
instanceof this.Raw
) {
2476 // Raw HTML inclusion
2477 s
+= contents
.value
;
2478 } else if ( contents
instanceof this.Cdata
) {
2480 if ( /<\/[a-zA-z]/.test( contents
.value
) ) {
2481 throw new Error( 'mw.html.element: Illegal end tag found in CDATA' );
2483 s
+= contents
.value
;
2485 throw new Error( 'mw.html.element: Invalid type of contents' );
2488 s
+= '</' + name
+ '>';
2493 * Wrapper object for raw HTML passed to mw.html.element().
2495 * @class mw.html.Raw
2497 Raw: function ( value
) {
2502 * Wrapper object for CDATA element contents passed to mw.html.element()
2504 * @class mw.html.Cdata
2506 Cdata: function ( value
) {
2512 // Skeleton user object, extended by the 'mediawiki.user' module.
2519 * @property {mw.Map}
2523 * @property {mw.Map}
2528 // OOUI widgets specific to MediaWiki
2532 * Registry and firing of events.
2534 * MediaWiki has various interface components that are extended, enhanced
2535 * or manipulated in some other way by extensions, gadgets and even
2538 * This framework helps streamlining the timing of when these other
2539 * code paths fire their plugins (instead of using document-ready,
2540 * which can and should be limited to firing only once).
2542 * Features like navigating to other wiki pages, previewing an edit
2543 * and editing itself – without a refresh – can then retrigger these
2544 * hooks accordingly to ensure everything still works as expected.
2548 * mw.hook( 'wikipage.content' ).add( fn ).remove( fn );
2549 * mw.hook( 'wikipage.content' ).fire( $content );
2551 * Handlers can be added and fired for arbitrary event names at any time. The same
2552 * event can be fired multiple times. The last run of an event is memorized
2553 * (similar to `$(document).ready` and `$.Deferred().done`).
2554 * This means if an event is fired, and a handler added afterwards, the added
2555 * function will be fired right away with the last given event data.
2557 * Like Deferreds and Promises, the mw.hook object is both detachable and chainable.
2558 * Thus allowing flexible use and optimal maintainability and authority control.
2559 * You can pass around the `add` and/or `fire` method to another piece of code
2560 * without it having to know the event name (or `mw.hook` for that matter).
2562 * var h = mw.hook( 'bar.ready' );
2563 * new mw.Foo( .. ).fetch( { callback: h.fire } );
2565 * Note: Events are documented with an underscore instead of a dot in the event
2566 * name due to jsduck not supporting dots in that position.
2570 hook
: ( function () {
2574 * Create an instance of mw.hook.
2578 * @param {string} name Name of hook.
2581 return function ( name
) {
2582 var list
= hasOwn
.call( lists
, name
) ?
2584 lists
[ name
] = $.Callbacks( 'memory' );
2588 * Register a hook handler
2590 * @param {...Function} handler Function to bind.
2596 * Unregister a hook handler
2598 * @param {...Function} handler Function to unbind.
2601 remove
: list
.remove
,
2606 * @param {...Mixed} data
2610 return list
.fireWith
.call( this, null, slice
.call( arguments
) );
2617 // Alias $j to jQuery for backwards compatibility
2618 // @deprecated since 1.23 Use $ or jQuery instead
2619 mw
.log
.deprecate( window
, '$j', $, 'Use $ or jQuery instead.' );
2622 * Log a message to window.console, if possible.
2624 * Useful to force logging of some errors that are otherwise hard to detect (i.e., this logs
2625 * also in production mode). Gets console references in each invocation instead of caching the
2626 * reference, so that debugging tools loaded later are supported (e.g. Firebug Lite in IE).
2630 * @param {string} topic Stream name passed by mw.track
2631 * @param {Object} data Data passed by mw.track
2632 * @param {Error} [data.exception]
2633 * @param {string} data.source Error source
2634 * @param {string} [data.module] Name of module which caused the error
2636 function log( topic
, data
) {
2639 source
= data
.source
,
2640 module
= data
.module
,
2641 console
= window
.console
;
2643 if ( console
&& console
.log
) {
2644 msg
= ( e
? 'Exception' : 'Error' ) + ' in ' + source
;
2646 msg
+= ' in module ' + module
;
2648 msg
+= ( e
? ':' : '.' );
2651 // If we have an exception object, log it to the error channel to trigger
2652 // proper stacktraces in browsers that support it. No fallback as we have
2653 // no browsers that don't support error(), but do support log().
2654 if ( e
&& console
.error
) {
2655 console
.error( String( e
), e
);
2660 // Subscribe to error streams
2661 mw
.trackSubscribe( 'resourceloader.exception', log
);
2662 mw
.trackSubscribe( 'resourceloader.assert', log
);
2665 * Fired when all modules associated with the page have finished loading.
2667 * @event resourceloader_loadEnd
2671 var loading
= $.grep( mw
.loader
.getModuleNames(), function ( module
) {
2672 return mw
.loader
.getState( module
) === 'loading';
2674 // In order to use jQuery.when (which stops early if one of the promises got rejected)
2675 // cast any loading failures into successes. We only need a callback, not the module.
2676 loading
= $.map( loading
, function ( module
) {
2677 return mw
.loader
.using( module
).then( null, function () {
2678 return $.Deferred().resolve();
2681 $.when
.apply( $, loading
).then( function () {
2682 mwPerformance
.mark( 'mwLoadEnd' );
2683 mw
.hook( 'resourceloader.loadEnd' ).fire();
2687 // Attach to window and globally alias
2688 window
.mw
= window
.mediaWiki
= mw
;