2 * Base library for MediaWiki.
4 * Exposed globally as `mw`, with `mediaWiki` as alias.
7 * @alternateClassName mediaWiki
10 /* global $VARS, $CODE */
15 var mw
, StringSet
, log
,
19 * FNV132 hash function
21 * This function implements the 32-bit version of FNV-1.
22 * It is equivalent to hash( 'fnv132', ... ) in PHP, except
23 * its output is base 36 rather than hex.
24 * See <https://en.wikipedia.org/wiki/FNV_hash_function>
27 * @param {string} str String to hash
28 * @return {string} hash as an seven-character base 36 string
30 function fnv132( str
) {
31 /* eslint-disable no-bitwise */
32 var hash
= 0x811C9DC5,
35 for ( i
= 0; i
< str
.length
; i
++ ) {
36 hash
+= ( hash
<< 1 ) + ( hash
<< 4 ) + ( hash
<< 7 ) + ( hash
<< 8 ) + ( hash
<< 24 );
37 hash
^= str
.charCodeAt( i
);
40 hash
= ( hash
>>> 0 ).toString( 36 );
41 while ( hash
.length
< 7 ) {
46 /* eslint-enable no-bitwise */
49 function defineFallbacks() {
50 // <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set>
51 StringSet
= window
.Set
|| ( function () {
56 function StringSet() {
57 this.set = Object
.create( null );
59 StringSet
.prototype.add = function ( value
) {
60 this.set[ value
] = true;
62 StringSet
.prototype.has = function ( value
) {
63 return value
in this.set;
70 * Alias property to the global object.
77 * @param {Mixed} value
79 function setGlobalMapValue( map
, key
, value
) {
80 map
.values
[ key
] = value
;
85 // Deprecation notice for mw.config globals (T58550, T72470)
86 map
=== mw
.config
&& 'Use mw.config instead.'
91 * Log a message to window.console, if possible.
93 * Useful to force logging of some errors that are otherwise hard to detect (i.e., this logs
94 * also in production mode). Gets console references in each invocation instead of caching the
95 * reference, so that debugging tools loaded later are supported (e.g. Firebug Lite in IE).
98 * @param {string} topic Stream name passed by mw.track
99 * @param {Object} data Data passed by mw.track
100 * @param {Error} [data.exception]
101 * @param {string} data.source Error source
102 * @param {string} [data.module] Name of module which caused the error
104 function logError( topic
, data
) {
105 /* eslint-disable no-console */
108 source
= data
.source
,
109 module
= data
.module
,
110 console
= window
.console
;
112 if ( console
&& console
.log
) {
113 msg
= ( e
? 'Exception' : 'Error' ) + ' in ' + source
;
115 msg
+= ' in module ' + module
;
117 msg
+= ( e
? ':' : '.' );
120 // If we have an exception object, log it to the warning channel to trigger
121 // proper stacktraces in browsers that support it.
122 if ( e
&& console
.warn
) {
126 /* eslint-enable no-console */
130 * Create an object that can be read from or written to via methods that allow
131 * interaction both with single and multiple properties at once.
137 * @param {boolean} [global=false] Whether to synchronise =values to the global
138 * window object (for backwards-compatibility with mw.config; T72470). Values are
139 * copied in one direction only. Changes to globals do not reflect in the map.
141 function Map( global
) {
142 this.values
= Object
.create( null );
143 if ( global
=== true ) {
144 // Override #set to also set the global variable
145 this.set = function ( selection
, value
) {
147 if ( arguments
.length
> 1 ) {
148 if ( typeof selection
!== 'string' ) {
151 setGlobalMapValue( this, selection
, value
);
154 if ( typeof selection
=== 'object' ) {
155 for ( s
in selection
) {
156 setGlobalMapValue( this, s
, selection
[ s
] );
169 * Get the value of one or more keys.
171 * If called with no arguments, all values are returned.
173 * @param {string|Array} [selection] Key or array of keys to retrieve values for.
174 * @param {Mixed} [fallback=null] Value for keys that don't exist.
175 * @return {Mixed|Object|null} If selection was a string, returns the value,
176 * If selection was an array, returns an object of key/values.
177 * If no selection is passed, a new object with all key/values is returned.
179 get: function ( selection
, fallback
) {
181 fallback
= arguments
.length
> 1 ? fallback
: null;
183 if ( Array
.isArray( selection
) ) {
185 for ( i
= 0; i
< selection
.length
; i
++ ) {
186 if ( typeof selection
[ i
] === 'string' ) {
187 results
[ selection
[ i
] ] = selection
[ i
] in this.values
?
188 this.values
[ selection
[ i
] ] :
195 if ( typeof selection
=== 'string' ) {
196 return selection
in this.values
?
197 this.values
[ selection
] :
201 if ( selection
=== undefined ) {
203 for ( i
in this.values
) {
204 results
[ i
] = this.values
[ i
];
209 // Invalid selection key
214 * Set one or more key/value pairs.
216 * @param {string|Object} selection Key to set value for, or object mapping keys to values
217 * @param {Mixed} [value] Value to set (optional, only in use when key is a string)
218 * @return {boolean} True on success, false on failure
220 set: function ( selection
, value
) {
222 // Use `arguments.length` because `undefined` is also a valid value.
223 if ( arguments
.length
> 1 ) {
224 if ( typeof selection
!== 'string' ) {
227 this.values
[ selection
] = value
;
230 if ( typeof selection
=== 'object' ) {
231 for ( s
in selection
) {
232 this.values
[ s
] = selection
[ s
];
240 * Check if one or more keys exist.
242 * @param {Mixed} selection Key or array of keys to check
243 * @return {boolean} True if the key(s) exist
245 exists: function ( selection
) {
247 if ( Array
.isArray( selection
) ) {
248 for ( i
= 0; i
< selection
.length
; i
++ ) {
249 if ( typeof selection
[ i
] !== 'string' || !( selection
[ i
] in this.values
) ) {
255 return typeof selection
=== 'string' && selection
in this.values
;
261 /* eslint-disable no-console */
262 log
= ( function () {
264 * Write a verbose message to the browser's console in debug mode.
266 * This method is mainly intended for verbose logging. It is a no-op in production mode.
267 * In ResourceLoader debug mode, it will use the browser's console if available, with
268 * fallback to creating a console interface in the DOM and logging messages there.
270 * See {@link mw.log} for other logging methods.
273 * @param {...string} msg Messages to output to console.
275 var log = function () {},
276 console
= window
.console
;
278 // Note: Keep list of methods in sync with restoration in mediawiki.log.js
279 // when adding or removing mw.log methods below!
282 * Collection of methods to help log messages to the console.
289 * Write a message to the browser console's warning channel.
291 * This method is a no-op in browsers that don't implement the Console API.
293 * @param {...string} msg Messages to output to console
295 log
.warn
= console
&& console
.warn
&& Function
.prototype.bind
?
296 Function
.prototype.bind
.call( console
.warn
, console
) :
300 * Write a message to the browser console's error channel.
302 * Most browsers also print a stacktrace when calling this method if the
303 * argument is an Error object.
305 * This method is a no-op in browsers that don't implement the Console API.
308 * @param {...Mixed} msg Messages to output to console
310 log
.error
= console
&& console
.error
&& Function
.prototype.bind
?
311 Function
.prototype.bind
.call( console
.error
, console
) :
315 * Create a property on a host object that, when accessed, will produce
316 * a deprecation warning in the console.
318 * @param {Object} obj Host object of deprecated property
319 * @param {string} key Name of property to create in `obj`
320 * @param {Mixed} val The value this property should return when accessed
321 * @param {string} [msg] Optional text to include in the deprecation message
322 * @param {string} [logName=key] Optional custom name for the feature.
323 * This is used instead of `key` in the message and `mw.deprecate` tracking.
325 log
.deprecate
= !Object
.defineProperty
? function ( obj
, key
, val
) {
327 } : function ( obj
, key
, val
, msg
, logName
) {
329 function maybeLog() {
331 trace
= new Error().stack
;
333 stacks
= new StringSet();
335 if ( !stacks
.has( trace
) ) {
337 name
= logName
|| key
;
338 mw
.track( 'mw.deprecate', name
);
340 'Use of "' + name
+ '" is deprecated.' + ( msg
? ( ' ' + msg
) : '' )
344 // Support: Safari 5.0
345 // Throws "not supported on DOM Objects" for Node or Element objects (incl. document)
346 // Safari 4.0 doesn't have this method, and it was fixed in Safari 5.1.
348 Object
.defineProperty( obj
, key
, {
355 set: function ( newVal
) {
367 /* eslint-enable no-console */
373 redefineFallbacksForTest: function () {
374 if ( !window
.QUnit
) {
375 throw new Error( 'Reset not allowed outside unit tests' );
381 * Get the current time, measured in milliseconds since January 1, 1970 (UTC).
383 * On browsers that implement the Navigation Timing API, this function will produce
384 * floating-point values with microsecond precision that are guaranteed to be monotonic.
385 * On all other browsers, it will fall back to using `Date`.
387 * @return {number} Current time
390 // Optimisation: Define the shortcut on first call, not at module definition.
391 var perf
= window
.performance
,
392 navStart
= perf
&& perf
.timing
&& perf
.timing
.navigationStart
;
394 // Define the relevant shortcut
395 mw
.now
= navStart
&& typeof perf
.now
=== 'function' ?
396 function () { return navStart
+ perf
.now(); } :
403 * List of all analytic events emitted so far.
408 trackQueue
: trackQueue
,
410 track: function ( topic
, data
) {
411 trackQueue
.push( { topic
: topic
, timeStamp
: mw
.now(), data
: data
} );
412 // The base module extends this method to fire events here
416 * Track an early error event via mw.track and send it to the window console.
419 * @param {string} topic Topic name
420 * @param {Object} data Data describing the event, encoded as an object; see mw#logError
422 trackError: function ( topic
, data
) {
423 mw
.track( topic
, data
);
424 logError( topic
, data
);
427 // Expose Map constructor
431 * Map of configuration values.
433 * Check out [the complete list of configuration values](https://www.mediawiki.org/wiki/Manual:Interface/JavaScript#mw.config)
436 * If `$wgLegacyJavaScriptGlobals` is true, this Map will add its values to the
437 * global `window` object.
439 * @property {mw.Map} config
441 // Dummy placeholder later assigned in ResourceLoaderStartUpModule
445 * Empty object for third-party libraries, for cases where you don't
446 * want to add a new global, or the global is bad and needs containment
454 * Access container for deprecated functionality that can be moved from
455 * from their legacy location and attached to this object (e.g. a global
456 * function that is deprecated and as stop-gap can be exposed through here).
458 * This was reserved for future use but never ended up being used.
460 * @deprecated since 1.22 Let deprecated identifiers keep their original name
461 * and use mw.log#deprecate to create an access container for tracking.
467 * Store for messages.
474 * Store for templates associated with a module.
478 templates
: new Map(),
484 * Client for ResourceLoader server end point.
486 * This client is in charge of maintaining the module registry and state
487 * machine, initiating network (batch) requests for loading modules, as
488 * well as dependency resolution and execution of source code.
490 * For more information, refer to
491 * <https://www.mediawiki.org/wiki/ResourceLoader/Features>
496 loader
: ( function () {
499 * Fired via mw.track on various resource loading errors.
501 * @event resourceloader_exception
502 * @param {Error|Mixed} e The error that was thrown. Almost always an Error
503 * object, but in theory module code could manually throw something else, and that
504 * might also end up here.
505 * @param {string} [module] Name of the module which caused the error. Omitted if the
506 * error is not module-related or the module cannot be easily identified due to
508 * @param {string} source Source of the error. Possible values:
510 * - style: stylesheet error (only affects old IE where a special style loading method
512 * - load-callback: exception thrown by user callback
513 * - module-execute: exception thrown by module code
514 * - resolve: failed to sort dependencies for a module in mw.loader.load
515 * - store-eval: could not evaluate module code cached in localStorage
516 * - store-localstorage-init: localStorage or JSON parse error in mw.loader.store.init
517 * - store-localstorage-json: JSON conversion error in mw.loader.store
518 * - store-localstorage-update: localStorage conversion error in mw.loader.store.
522 * Fired via mw.track on resource loading error conditions.
524 * @event resourceloader_assert
525 * @param {string} source Source of the error. Possible values:
527 * - bug-T59567: failed to cache script due to an Opera function -> string conversion
528 * bug; see <https://phabricator.wikimedia.org/T59567> for details
532 * Mapping of registered modules.
534 * See #implement and #execute for exact details on support for script, style and messages.
540 * // From mw.loader.register()
541 * 'version': '########' (hash)
542 * 'dependencies': ['required.foo', 'bar.also', ...]
543 * 'group': 'somegroup', (or) null
544 * 'source': 'local', (or) 'anotherwiki'
545 * 'skip': 'return !!window.Example', (or) null
546 * 'module': export Object
548 * // Set from execute() or mw.loader.state()
549 * 'state': 'registered', 'loaded', 'loading', 'ready', 'error', or 'missing'
551 * // Optionally added at run-time by mw.loader.implement()
553 * 'script': closure, array of urls, or string
554 * 'style': { ... } (see #execute)
555 * 'messages': { 'key': 'value', ... }
562 * The module is known to the system but not yet required.
563 * Meta data is registered via mw.loader#register. Calls to that method are
564 * generated server-side by the startup module.
566 * The module was required through mw.loader (either directly or as dependency of
567 * another module). The client will fetch module contents from the server.
568 * The contents are then stashed in the registry via mw.loader#implement.
570 * The module has been loaded from the server and stashed via mw.loader#implement.
571 * Once the module has no more dependencies in-flight, the module will be executed,
572 * controlled via #requestPropagation and #doPropagation.
574 * The module is being executed.
576 * The module has been successfully executed.
578 * The module (or one of its dependencies) produced an error during execution.
580 * The module was registered client-side and requested, but the server denied knowledge
581 * of the module's existence.
586 var registry
= Object
.create( null ),
587 // Mapping of sources, keyed by source-id, values are strings.
592 // 'sourceId': 'http://example.org/w/load.php'
595 sources
= Object
.create( null ),
597 // For queueModuleScript()
598 handlingPendingRequests
= false,
599 pendingRequests
= [],
601 // List of modules to be loaded
605 * List of callback jobs waiting for modules to be ready.
607 * Jobs are created by #enqueue() and run by #doPropagation().
608 * Typically when a job is created for a module, the job's dependencies contain
609 * both the required module and all its recursive dependencies.
614 * 'dependencies': [ module names ],
615 * 'ready': Function callback
616 * 'error': Function callback
619 * @property {Object[]} jobs
624 // For #requestPropagation() and #doPropagation()
625 willPropagate
= false,
630 * @property {Array} baseModules
632 baseModules
= $VARS
.baseModules
,
635 * For #addEmbeddedCSS() and #addLink()
638 * @property {HTMLElement|null} marker
640 marker
= document
.querySelector( 'meta[name="ResourceLoaderDynamicStyles"]' ),
642 // For #addEmbeddedCSS()
644 rAF
= window
.requestAnimationFrame
|| setTimeout
;
647 * Create a new style element and add it to the DOM.
650 * @param {string} text CSS text
651 * @param {Node|null} [nextNode] The element where the style tag
652 * should be inserted before
653 * @return {HTMLElement} Reference to the created style element
655 function newStyleTag( text
, nextNode
) {
656 var el
= document
.createElement( 'style' );
657 el
.appendChild( document
.createTextNode( text
) );
658 if ( nextNode
&& nextNode
.parentNode
) {
659 nextNode
.parentNode
.insertBefore( el
, nextNode
);
661 document
.head
.appendChild( el
);
668 * @param {Object} cssBuffer
670 function flushCssBuffer( cssBuffer
) {
672 // Mark this object as inactive now so that further calls to addEmbeddedCSS() from
673 // the callbacks go to a new buffer instead of this one (T105973)
674 cssBuffer
.active
= false;
675 newStyleTag( cssBuffer
.cssText
, marker
);
676 for ( i
= 0; i
< cssBuffer
.callbacks
.length
; i
++ ) {
677 cssBuffer
.callbacks
[ i
]();
682 * Add a bit of CSS text to the current browser page.
684 * The creation and insertion of the `<style>` element is debounced for two reasons:
686 * - Performing the insertion before the next paint round via requestAnimationFrame
687 * avoids forced or wasted style recomputations, which are expensive in browsers.
688 * - Reduce how often new stylesheets are inserted by letting additional calls to this
689 * function accumulate into a buffer for at least one JavaScript tick. Modules are
690 * received from the server in batches, which means there is likely going to be many
691 * calls to this function in a row within the same tick / the same call stack.
695 * @param {string} cssText CSS text to be added in a `<style>` tag.
696 * @param {Function} callback Called after the insertion has occurred
698 function addEmbeddedCSS( cssText
, callback
) {
699 // Create a buffer if:
700 // - We don't have one yet.
701 // - The previous one is closed.
702 // - The next CSS chunk syntactically needs to be at the start of a stylesheet (T37562).
703 if ( !nextCssBuffer
|| nextCssBuffer
.active
=== false || cssText
.slice( 0, '@import'.length
) === '@import' ) {
711 // Linebreak for somewhat distinguishable sections
712 nextCssBuffer
.cssText
+= '\n' + cssText
;
713 nextCssBuffer
.callbacks
.push( callback
);
715 if ( nextCssBuffer
.active
=== null ) {
716 nextCssBuffer
.active
= true;
717 // The flushCssBuffer callback has its parameter bound by reference, which means
718 // 1) We can still extend the buffer from our object reference after this point.
719 // 2) We can safely re-assign the variable (not the object) to start a new buffer.
720 rAF( flushCssBuffer
.bind( null, nextCssBuffer
) );
726 * @param {Array} modules List of module names
727 * @return {string} Hash of concatenated version hashes.
729 function getCombinedVersion( modules
) {
730 var hashes
= modules
.reduce( function ( result
, module
) {
731 return result
+ registry
[ module
].version
;
733 return fnv132( hashes
);
737 * Determine whether all dependencies are in state 'ready', which means we may
738 * execute the module or job now.
741 * @param {Array} modules Names of modules to be checked
742 * @return {boolean} True if all modules are in state 'ready', false otherwise
744 function allReady( modules
) {
746 for ( i
= 0; i
< modules
.length
; i
++ ) {
747 if ( mw
.loader
.getState( modules
[ i
] ) !== 'ready' ) {
755 * Determine whether all direct and base dependencies are in state 'ready'
758 * @param {string} module Name of the module to be checked
759 * @return {boolean} True if all direct/base dependencies are in state 'ready'; false otherwise
761 function allWithImplicitReady( module
) {
762 return allReady( registry
[ module
].dependencies
) &&
763 ( baseModules
.indexOf( module
) !== -1 || allReady( baseModules
) );
767 * Determine whether all dependencies are in state 'ready', which means we may
768 * execute the module or job now.
771 * @param {Array} modules Names of modules to be checked
772 * @return {boolean} True if no modules are in state 'error' or 'missing', false otherwise
774 function anyFailed( modules
) {
776 for ( i
= 0; i
< modules
.length
; i
++ ) {
777 state
= mw
.loader
.getState( modules
[ i
] );
778 if ( state
=== 'error' || state
=== 'missing' ) {
786 * Handle propagation of module state changes and reactions to them.
788 * - When a module reaches a failure state, this should be propagated to
789 * modules that depend on the failed module.
790 * - When a module reaches a final state, pending job callbacks for the
791 * module from mw.loader.using() should be called.
792 * - When a module reaches the 'ready' state from #execute(), consider
793 * executing dependant modules now having their dependencies satisfied.
794 * - When a module reaches the 'loaded' state from mw.loader.implement,
795 * consider executing it, if it has no unsatisfied dependencies.
799 function doPropagation() {
800 var errorModule
, baseModuleError
, module
, i
, failed
, job
,
803 // Keep going until the last iteration performed no actions.
805 didPropagate
= false;
807 // Stage 1: Propagate failures
808 while ( errorModules
.length
) {
809 errorModule
= errorModules
.shift();
810 baseModuleError
= baseModules
.indexOf( errorModule
) !== -1;
811 for ( module
in registry
) {
812 if ( registry
[ module
].state
!== 'error' && registry
[ module
].state
!== 'missing' ) {
813 if ( baseModuleError
&& baseModules
.indexOf( module
) === -1 ) {
814 // Propate error from base module to all regular (non-base) modules
815 registry
[ module
].state
= 'error';
817 } else if ( registry
[ module
].dependencies
.indexOf( errorModule
) !== -1 ) {
818 // Propagate error from dependency to depending module
819 registry
[ module
].state
= 'error';
820 // .. and propagate it further
821 errorModules
.push( module
);
828 // Stage 2: Execute 'loaded' modules with no unsatisfied dependencies
829 for ( module
in registry
) {
830 if ( registry
[ module
].state
=== 'loaded' && allWithImplicitReady( module
) ) {
831 // Recursively execute all dependent modules that were already loaded
832 // (waiting for execution) and no longer have unsatisfied dependencies.
833 // Base modules may have dependencies amongst eachother to ensure correct
834 // execution order. Regular modules wait for all base modules.
835 // eslint-disable-next-line no-use-before-define
841 // Stage 3: Invoke job callbacks that are no longer blocked
842 for ( i
= 0; i
< jobs
.length
; i
++ ) {
844 failed
= anyFailed( job
.dependencies
);
845 if ( failed
|| allReady( job
.dependencies
) ) {
849 if ( failed
&& job
.error
) {
850 job
.error( new Error( 'Module has failed dependencies' ), job
.dependencies
);
851 } else if ( !failed
&& job
.ready
) {
855 // A user-defined callback raised an exception.
856 // Swallow it to protect our state machine!
857 mw
.trackError( 'resourceloader.exception', {
859 source
: 'load-callback'
865 } while ( didPropagate
);
867 willPropagate
= false;
871 * Request a (debounced) call to doPropagation().
875 function requestPropagation() {
876 if ( willPropagate
) {
877 // Already scheduled, or, we're already in a doPropagation stack.
880 willPropagate
= true;
881 // Yield for two reasons:
882 // * Allow successive calls to mw.loader.implement() from the same
883 // load.php response, or from the same asyncEval() to be in the
884 // propagation batch.
885 // * Allow the browser to breathe between the reception of
886 // module source code and the execution of it.
888 // Use a high priority because the user may be waiting for interactions
889 // to start being possible. But, first provide a moment (up to 'timeout')
890 // for native input event handling (e.g. scrolling/typing/clicking).
891 mw
.requestIdleCallback( doPropagation
, { timeout
: 1 } );
895 * Update a module's state in the registry and make sure any neccesary
896 * propagation will occur. See #doPropagation for more about propagation.
897 * See #registry for more about how states are used.
900 * @param {string} module
901 * @param {string} state
903 function setAndPropagate( module
, state
) {
904 registry
[ module
].state
= state
;
905 if ( state
=== 'loaded' || state
=== 'ready' || state
=== 'error' || state
=== 'missing' ) {
906 if ( state
=== 'ready' ) {
907 // Queue to later be synced to the local module store.
908 mw
.loader
.store
.add( module
);
909 } else if ( state
=== 'error' || state
=== 'missing' ) {
910 errorModules
.push( module
);
912 requestPropagation();
917 * Resolve dependencies and detect circular references.
920 * @param {string} module Name of the top-level module whose dependencies shall be
921 * resolved and sorted.
922 * @param {Array} resolved Returns a topological sort of the given module and its
923 * dependencies, such that later modules depend on earlier modules. The array
924 * contains the module names. If the array contains already some module names,
925 * this function appends its result to the pre-existing array.
926 * @param {StringSet} [unresolved] Used to track the current dependency
927 * chain, and to report loops in the dependency graph.
928 * @throws {Error} If any unregistered module or a dependency loop is encountered
930 function sortDependencies( module
, resolved
, unresolved
) {
933 if ( !( module
in registry
) ) {
934 throw new Error( 'Unknown dependency: ' + module
);
937 if ( registry
[ module
].skip
!== null ) {
938 // eslint-disable-next-line no-new-func
939 skip
= new Function( registry
[ module
].skip
);
940 registry
[ module
].skip
= null;
942 registry
[ module
].skipped
= true;
943 registry
[ module
].dependencies
= [];
944 setAndPropagate( module
, 'ready' );
949 if ( resolved
.indexOf( module
) !== -1 ) {
950 // Module already resolved; nothing to do
953 // Create unresolved if not passed in
955 unresolved
= new StringSet();
959 if ( baseModules
.indexOf( module
) === -1 ) {
960 baseModules
.forEach( function ( baseModule
) {
961 if ( resolved
.indexOf( baseModule
) === -1 ) {
962 resolved
.push( baseModule
);
967 // Tracks down dependencies
968 deps
= registry
[ module
].dependencies
;
969 unresolved
.add( module
);
970 for ( i
= 0; i
< deps
.length
; i
++ ) {
971 if ( resolved
.indexOf( deps
[ i
] ) === -1 ) {
972 if ( unresolved
.has( deps
[ i
] ) ) {
974 'Circular reference detected: ' + module
+ ' -> ' + deps
[ i
]
978 sortDependencies( deps
[ i
], resolved
, unresolved
);
981 resolved
.push( module
);
985 * Get names of module that a module depends on, in their proper dependency order.
988 * @param {string[]} modules Array of string module names
989 * @return {Array} List of dependencies, including 'module'.
990 * @throws {Error} If an unregistered module or a dependency loop is encountered
992 function resolve( modules
) {
993 var i
, resolved
= [];
994 for ( i
= 0; i
< modules
.length
; i
++ ) {
995 sortDependencies( modules
[ i
], resolved
);
1001 * Like #resolve(), except it will silently ignore modules that
1002 * are missing or have missing dependencies.
1005 * @param {string[]} modules Array of string module names
1006 * @return {Array} List of dependencies.
1008 function resolveStubbornly( modules
) {
1009 var i
, saved
, resolved
= [];
1010 for ( i
= 0; i
< modules
.length
; i
++ ) {
1011 saved
= resolved
.slice();
1013 sortDependencies( modules
[ i
], resolved
);
1015 // This module is unknown or has unknown dependencies.
1016 // Undo any incomplete resolutions made and keep going.
1018 mw
.trackError( 'resourceloader.exception', {
1028 * Load and execute a script.
1031 * @param {string} src URL to script, will be used as the src attribute in the script tag
1032 * @param {Function} [callback] Callback to run after request resolution
1034 function addScript( src
, callback
) {
1035 var script
= document
.createElement( 'script' );
1037 script
.onload
= script
.onerror = function () {
1038 if ( script
.parentNode
) {
1039 script
.parentNode
.removeChild( script
);
1047 document
.head
.appendChild( script
);
1051 * Queue the loading and execution of a script for a particular module.
1053 * This does for debug mode what runScript() does for production.
1056 * @param {string} src URL of the script
1057 * @param {string} moduleName Name of currently executing module
1058 * @param {Function} callback Callback to run after addScript() resolution
1060 function queueModuleScript( src
, moduleName
, callback
) {
1061 pendingRequests
.push( function () {
1062 // Keep in sync with execute()/runScript().
1063 if ( moduleName
!== 'jquery' ) {
1064 window
.require
= mw
.loader
.require
;
1065 window
.module
= registry
[ moduleName
].module
;
1067 addScript( src
, function () {
1068 // 'module.exports' should not persist after the file is executed to
1069 // avoid leakage to unrelated code. 'require' should be kept, however,
1070 // as asynchronous access to 'require' is allowed and expected. (T144879)
1071 delete window
.module
;
1073 // Start the next one (if any)
1074 if ( pendingRequests
[ 0 ] ) {
1075 pendingRequests
.shift()();
1077 handlingPendingRequests
= false;
1081 if ( !handlingPendingRequests
&& pendingRequests
[ 0 ] ) {
1082 handlingPendingRequests
= true;
1083 pendingRequests
.shift()();
1088 * Utility function for execute()
1091 * @param {string} [media] Media attribute
1092 * @param {string} url URL
1094 function addLink( media
, url
) {
1095 var el
= document
.createElement( 'link' );
1097 el
.rel
= 'stylesheet';
1098 if ( media
&& media
!== 'all' ) {
1101 // If you end up here from an IE exception "SCRIPT: Invalid property value.",
1102 // see #addEmbeddedCSS, T33676, T43331, and T49277 for details.
1105 if ( marker
&& marker
.parentNode
) {
1106 marker
.parentNode
.insertBefore( el
, marker
);
1108 document
.head
.appendChild( el
);
1114 * @param {string} code JavaScript code
1116 function domEval( code
) {
1117 var script
= document
.createElement( 'script' );
1118 if ( mw
.config
.get( 'wgCSPNonce' ) !== false ) {
1119 script
.nonce
= mw
.config
.get( 'wgCSPNonce' );
1122 document
.head
.appendChild( script
);
1123 script
.parentNode
.removeChild( script
);
1127 * Add one or more modules to the module load queue.
1132 * @param {string[]} dependencies Array of module names in the registry
1133 * @param {Function} [ready] Callback to execute when all dependencies are ready
1134 * @param {Function} [error] Callback to execute when any dependency fails
1136 function enqueue( dependencies
, ready
, error
) {
1137 if ( allReady( dependencies
) ) {
1138 // Run ready immediately
1139 if ( ready
!== undefined ) {
1145 if ( anyFailed( dependencies
) ) {
1146 if ( error
!== undefined ) {
1147 // Execute error immediately if any dependencies have errors
1149 new Error( 'One or more dependencies failed to load' ),
1156 // Not all dependencies are ready, add to the load queue...
1158 // Add ready and error callbacks if they were given
1159 if ( ready
!== undefined || error
!== undefined ) {
1161 // Narrow down the list to modules that are worth waiting for
1162 dependencies
: dependencies
.filter( function ( module
) {
1163 var state
= registry
[ module
].state
;
1164 return state
=== 'registered' || state
=== 'loaded' || state
=== 'loading' || state
=== 'executing';
1171 dependencies
.forEach( function ( module
) {
1172 // Only queue modules that are still in the initial 'registered' state
1173 // (not ones already loading, ready or error).
1174 if ( registry
[ module
].state
=== 'registered' && queue
.indexOf( module
) === -1 ) {
1175 // Private modules must be embedded in the page. Don't bother queuing
1176 // these as the server will deny them anyway (T101806).
1177 if ( registry
[ module
].group
=== 'private' ) {
1178 setAndPropagate( module
, 'error' );
1181 queue
.push( module
);
1189 * Executes a loaded module, making it ready to use
1192 * @param {string} module Module name to execute
1194 function execute( module
) {
1195 var key
, value
, media
, i
, urls
, cssHandle
, siteDeps
, siteDepErr
, runScript
,
1198 if ( registry
[ module
].state
!== 'loaded' ) {
1199 throw new Error( 'Module in state "' + registry
[ module
].state
+ '" may not be executed: ' + module
);
1202 registry
[ module
].state
= 'executing';
1203 $CODE
.profileExecuteStart();
1205 runScript = function () {
1206 var script
, markModuleReady
, nestedAddScript
;
1208 $CODE
.profileScriptStart();
1209 script
= registry
[ module
].script
;
1210 markModuleReady = function () {
1211 $CODE
.profileScriptEnd();
1212 setAndPropagate( module
, 'ready' );
1214 nestedAddScript = function ( arr
, callback
, i
) {
1215 // Recursively call queueModuleScript() in its own callback
1216 // for each element of arr.
1217 if ( i
>= arr
.length
) {
1218 // We're at the end of the array
1223 queueModuleScript( arr
[ i
], module
, function () {
1224 nestedAddScript( arr
, callback
, i
+ 1 );
1229 if ( Array
.isArray( script
) ) {
1230 nestedAddScript( script
, markModuleReady
, 0 );
1231 } else if ( typeof script
=== 'function' ) {
1232 // Keep in sync with queueModuleScript() for debug mode
1233 if ( module
=== 'jquery' ) {
1234 // This is a special case for when 'jquery' itself is being loaded.
1235 // - The standard jquery.js distribution does not set `window.jQuery`
1236 // in CommonJS-compatible environments (Node.js, AMD, RequireJS, etc.).
1237 // - MediaWiki's 'jquery' module also bundles jquery.migrate.js, which
1238 // in a CommonJS-compatible environment, will use require('jquery'),
1239 // but that can't work when we're still inside that module.
1242 // Pass jQuery twice so that the signature of the closure which wraps
1243 // the script can bind both '$' and 'jQuery'.
1244 script( window
.$, window
.$, mw
.loader
.require
, registry
[ module
].module
);
1248 } else if ( typeof script
=== 'string' ) {
1249 // Site and user modules are legacy scripts that run in the global scope.
1250 // This is transported as a string instead of a function to avoid needing
1251 // to use string manipulation to undo the function wrapper.
1256 // Module without script
1260 // Use mw.track instead of mw.log because these errors are common in production mode
1261 // (e.g. undefined variable), and mw.log is only enabled in debug mode.
1262 setAndPropagate( module
, 'error' );
1263 $CODE
.profileScriptEnd();
1264 mw
.trackError( 'resourceloader.exception', {
1267 source
: 'module-execute'
1272 // Add localizations to message system
1273 if ( registry
[ module
].messages
) {
1274 mw
.messages
.set( registry
[ module
].messages
);
1277 // Initialise templates
1278 if ( registry
[ module
].templates
) {
1279 mw
.templates
.set( module
, registry
[ module
].templates
);
1282 // Adding of stylesheets is asynchronous via addEmbeddedCSS().
1283 // The below function uses a counting semaphore to make sure we don't call
1284 // runScript() until after this module's stylesheets have been inserted
1286 cssHandle = function () {
1287 // Increase semaphore, when creating a callback for addEmbeddedCSS.
1289 return function () {
1291 // Decrease semaphore, when said callback is invoked.
1293 if ( cssPending
=== 0 ) {
1295 // This callback is exposed to addEmbeddedCSS, which is outside the execute()
1296 // function and is not concerned with state-machine integrity. In turn,
1297 // addEmbeddedCSS() actually exposes stuff further into the browser (rAF).
1298 // If increment and decrement callbacks happen in the wrong order, or start
1299 // again afterwards, then this branch could be reached multiple times.
1300 // To protect the integrity of the state-machine, prevent that from happening
1301 // by making runScript() cannot be called more than once. We store a private
1302 // reference when we first reach this branch, then deference the original, and
1303 // call our reference to it.
1304 runScriptCopy
= runScript
;
1305 runScript
= undefined;
1311 // Process styles (see also mw.loader.implement)
1312 // * back-compat: { <media>: css }
1313 // * back-compat: { <media>: [url, ..] }
1314 // * { "css": [css, ..] }
1315 // * { "url": { <media>: [url, ..] } }
1316 if ( registry
[ module
].style
) {
1317 for ( key
in registry
[ module
].style
) {
1318 value
= registry
[ module
].style
[ key
];
1321 if ( key
!== 'url' && key
!== 'css' ) {
1322 // Backwards compatibility, key is a media-type
1323 if ( typeof value
=== 'string' ) {
1324 // back-compat: { <media>: css }
1325 // Ignore 'media' because it isn't supported (nor was it used).
1326 // Strings are pre-wrapped in "@media". The media-type was just ""
1327 // (because it had to be set to something).
1328 // This is one of the reasons why this format is no longer used.
1329 addEmbeddedCSS( value
, cssHandle() );
1331 // back-compat: { <media>: [url, ..] }
1337 // Array of css strings in key 'css',
1338 // or back-compat array of urls from media-type
1339 if ( Array
.isArray( value
) ) {
1340 for ( i
= 0; i
< value
.length
; i
++ ) {
1341 if ( key
=== 'bc-url' ) {
1342 // back-compat: { <media>: [url, ..] }
1343 addLink( media
, value
[ i
] );
1344 } else if ( key
=== 'css' ) {
1345 // { "css": [css, ..] }
1346 addEmbeddedCSS( value
[ i
], cssHandle() );
1349 // Not an array, but a regular object
1350 // Array of urls inside media-type key
1351 } else if ( typeof value
=== 'object' ) {
1352 // { "url": { <media>: [url, ..] } }
1353 for ( media
in value
) {
1354 urls
= value
[ media
];
1355 for ( i
= 0; i
< urls
.length
; i
++ ) {
1356 addLink( media
, urls
[ i
] );
1363 // End profiling of execute()-self before we call runScript(),
1364 // which we want to measure separately without overlap.
1365 $CODE
.profileExecuteEnd();
1367 if ( module
=== 'user' ) {
1368 // Implicit dependency on the site module. Not a real dependency because it should
1369 // run after 'site' regardless of whether it succeeds or fails.
1370 // Note: This is a simplified version of mw.loader.using(), inlined here because
1371 // mw.loader.using() is part of mediawiki.base (depends on jQuery; T192623).
1373 siteDeps
= resolve( [ 'site' ] );
1378 if ( siteDepErr
=== undefined ) {
1379 enqueue( siteDeps
, runScript
, runScript
);
1381 } else if ( cssPending
=== 0 ) {
1382 // Regular module without styles
1385 // else: runScript will get called via cssHandle()
1388 function sortQuery( o
) {
1397 for ( key
= 0; key
< a
.length
; key
++ ) {
1398 sorted
[ a
[ key
] ] = o
[ a
[ key
] ];
1404 * Converts a module map of the form `{ foo: [ 'bar', 'baz' ], bar: [ 'baz, 'quux' ] }`
1405 * to a query string of the form `foo.bar,baz|bar.baz,quux`.
1407 * See `ResourceLoader::makePackedModulesString()` in PHP, of which this is a port.
1408 * On the server, unpacking is done by `ResourceLoaderContext::expandModuleNames()`.
1410 * Note: This is only half of the logic, the other half has to be in #batchRequest(),
1411 * because its implementation needs to keep track of potential string size in order
1412 * to decide when to split the requests due to url size.
1415 * @param {Object} moduleMap Module map
1417 * @return {string} return.str Module query string
1418 * @return {Array} return.list List of module names in matching order
1420 function buildModulesString( moduleMap
) {
1425 function restore( suffix
) {
1429 for ( prefix
in moduleMap
) {
1430 p
= prefix
=== '' ? '' : prefix
+ '.';
1431 str
.push( p
+ moduleMap
[ prefix
].join( ',' ) );
1432 list
.push
.apply( list
, moduleMap
[ prefix
].map( restore
) );
1435 str
: str
.join( '|' ),
1441 * Resolve indexed dependencies.
1443 * ResourceLoader uses an optimisation to save space which replaces module names in
1444 * dependency lists with the index of that module within the array of module
1445 * registration data if it exists. The benefit is a significant reduction in the data
1446 * size of the startup module. This function changes those dependency lists back to
1447 * arrays of strings.
1450 * @param {Array} modules Modules array
1452 function resolveIndexedDependencies( modules
) {
1454 function resolveIndex( dep
) {
1455 return typeof dep
=== 'number' ? modules
[ dep
][ 0 ] : dep
;
1457 for ( i
= 0; i
< modules
.length
; i
++ ) {
1458 deps
= modules
[ i
][ 2 ];
1460 for ( j
= 0; j
< deps
.length
; j
++ ) {
1461 deps
[ j
] = resolveIndex( deps
[ j
] );
1469 * @param {Object} params Map of parameter names to values
1472 function makeQueryString( params
) {
1473 return Object
.keys( params
).map( function ( key
) {
1474 return encodeURIComponent( key
) + '=' + encodeURIComponent( params
[ key
] );
1479 * Create network requests for a batch of modules.
1481 * This is an internal method for #work(). This must not be called directly
1482 * unless the modules are already registered, and no request is in progress,
1483 * and the module state has already been set to `loading`.
1486 * @param {string[]} batch
1488 function batchRequest( batch
) {
1489 var reqBase
, splits
, maxQueryLength
, b
, bSource
, bGroup
,
1490 source
, group
, i
, modules
, sourceLoadScript
,
1491 currReqBase
, currReqBaseLength
, moduleMap
, currReqModules
, l
,
1492 lastDotIndex
, prefix
, suffix
, bytesAdded
;
1495 * Start the currently drafted request to the server.
1499 function doRequest() {
1500 // Optimisation: Inherit (Object.create), not copy ($.extend)
1501 var query
= Object
.create( currReqBase
),
1502 packed
= buildModulesString( moduleMap
);
1503 query
.modules
= packed
.str
;
1504 // The packing logic can change the effective order, even if the input was
1505 // sorted. As such, the call to getCombinedVersion() must use this
1506 // effective order, instead of currReqModules, as otherwise the combined
1507 // version will not match the hash expected by the server based on
1508 // combining versions from the module query string in-order. (T188076)
1509 query
.version
= getCombinedVersion( packed
.list
);
1510 query
= sortQuery( query
);
1511 addScript( sourceLoadScript
+ '?' + makeQueryString( query
) );
1514 if ( !batch
.length
) {
1518 // Always order modules alphabetically to help reduce cache
1519 // misses for otherwise identical content.
1522 // Query parameters common to all requests
1524 skin
: mw
.config
.get( 'skin' ),
1525 lang
: mw
.config
.get( 'wgUserLanguage' ),
1526 debug
: mw
.config
.get( 'debug' )
1528 maxQueryLength
= mw
.config
.get( 'wgResourceLoaderMaxQueryLength', 2000 );
1530 // Split module list by source and by group.
1531 splits
= Object
.create( null );
1532 for ( b
= 0; b
< batch
.length
; b
++ ) {
1533 bSource
= registry
[ batch
[ b
] ].source
;
1534 bGroup
= registry
[ batch
[ b
] ].group
;
1535 if ( !splits
[ bSource
] ) {
1536 splits
[ bSource
] = Object
.create( null );
1538 if ( !splits
[ bSource
][ bGroup
] ) {
1539 splits
[ bSource
][ bGroup
] = [];
1541 splits
[ bSource
][ bGroup
].push( batch
[ b
] );
1544 for ( source
in splits
) {
1545 sourceLoadScript
= sources
[ source
];
1547 for ( group
in splits
[ source
] ) {
1549 // Cache access to currently selected list of
1550 // modules for this group from this source.
1551 modules
= splits
[ source
][ group
];
1553 // Query parameters common to requests for this module group
1554 // Optimisation: Inherit (Object.create), not copy ($.extend)
1555 currReqBase
= Object
.create( reqBase
);
1556 // User modules require a user name in the query string.
1557 if ( group
=== 'user' && mw
.config
.get( 'wgUserName' ) !== null ) {
1558 currReqBase
.user
= mw
.config
.get( 'wgUserName' );
1561 // In addition to currReqBase, doRequest() will also add 'modules' and 'version'.
1562 // > '&modules='.length === 9
1563 // > '&version=1234567'.length === 16
1565 currReqBaseLength
= makeQueryString( currReqBase
).length
+ 25;
1567 // We may need to split up the request to honor the query string length limit,
1568 // so build it piece by piece.
1569 l
= currReqBaseLength
;
1570 moduleMap
= Object
.create( null ); // { prefix: [ suffixes ] }
1571 currReqModules
= [];
1573 for ( i
= 0; i
< modules
.length
; i
++ ) {
1574 // Determine how many bytes this module would add to the query string
1575 lastDotIndex
= modules
[ i
].lastIndexOf( '.' );
1576 // If lastDotIndex is -1, substr() returns an empty string
1577 prefix
= modules
[ i
].substr( 0, lastDotIndex
);
1578 suffix
= modules
[ i
].slice( lastDotIndex
+ 1 );
1579 bytesAdded
= moduleMap
[ prefix
] ?
1580 suffix
.length
+ 3 : // '%2C'.length == 3
1581 modules
[ i
].length
+ 3; // '%7C'.length == 3
1583 // If the url would become too long, create a new one, but don't create empty requests
1584 if ( maxQueryLength
> 0 && currReqModules
.length
&& l
+ bytesAdded
> maxQueryLength
) {
1585 // Dispatch what we've got...
1587 // .. and start again.
1588 l
= currReqBaseLength
;
1589 moduleMap
= Object
.create( null );
1590 currReqModules
= [];
1592 mw
.track( 'resourceloader.splitRequest', { maxQueryLength
: maxQueryLength
} );
1594 if ( !moduleMap
[ prefix
] ) {
1595 moduleMap
[ prefix
] = [];
1598 moduleMap
[ prefix
].push( suffix
);
1599 currReqModules
.push( modules
[ i
] );
1601 // If there's anything left in moduleMap, request that too
1602 if ( currReqModules
.length
) {
1611 * @param {string[]} implementations Array containing pieces of JavaScript code in the
1612 * form of calls to mw.loader#implement().
1613 * @param {Function} cb Callback in case of failure
1614 * @param {Error} cb.err
1616 function asyncEval( implementations
, cb
) {
1617 if ( !implementations
.length
) {
1620 mw
.requestIdleCallback( function () {
1622 domEval( implementations
.join( ';' ) );
1630 * Make a versioned key for a specific module.
1633 * @param {string} module Module name
1634 * @return {string|null} Module key in format '`[name]@[version]`',
1635 * or null if the module does not exist
1637 function getModuleKey( module
) {
1638 return module
in registry
? ( module
+ '@' + registry
[ module
].version
) : null;
1643 * @param {string} key Module name or '`[name]@[version]`'
1646 function splitModuleKey( key
) {
1647 var index
= key
.indexOf( '@' );
1648 if ( index
=== -1 ) {
1655 name
: key
.slice( 0, index
),
1656 version
: key
.slice( index
+ 1 )
1662 * @param {string} module
1663 * @param {string|number} [version]
1664 * @param {string[]} [dependencies]
1665 * @param {string} [group]
1666 * @param {string} [source]
1667 * @param {string} [skip]
1669 function registerOne( module
, version
, dependencies
, group
, source
, skip
) {
1670 if ( module
in registry
) {
1671 throw new Error( 'module already registered: ' + module
);
1673 registry
[ module
] = {
1674 // Exposed to execute() for mw.loader.implement() closures.
1675 // Import happens via require().
1679 version
: String( version
|| '' ),
1680 dependencies
: dependencies
|| [],
1681 group
: typeof group
=== 'string' ? group
: null,
1682 source
: typeof source
=== 'string' ? source
: 'local',
1683 state
: 'registered',
1684 skip
: typeof skip
=== 'string' ? skip
: null
1688 /* Public Members */
1691 * The module registry is exposed as an aid for debugging and inspecting page
1692 * state; it is not a public interface for modifying the registry.
1698 moduleRegistry
: registry
,
1701 * @inheritdoc #newStyleTag
1704 addStyleTag
: newStyleTag
,
1711 * Start loading of all queued module dependencies.
1716 var q
, batch
, implementations
, sourceModules
;
1720 // Appends a list of modules from the queue to the batch
1721 for ( q
= 0; q
< queue
.length
; q
++ ) {
1722 // Only load modules which are registered
1723 if ( queue
[ q
] in registry
&& registry
[ queue
[ q
] ].state
=== 'registered' ) {
1724 // Prevent duplicate entries
1725 if ( batch
.indexOf( queue
[ q
] ) === -1 ) {
1726 batch
.push( queue
[ q
] );
1727 // Mark registered modules as loading
1728 registry
[ queue
[ q
] ].state
= 'loading';
1733 // Now that the queue has been processed into a batch, clear the queue.
1734 // This MUST happen before we initiate any eval or network request. Otherwise,
1735 // it is possible for a cached script to instantly trigger the same work queue
1736 // again; all before we've cleared it causing each request to include modules
1737 // which are already loaded.
1740 if ( !batch
.length
) {
1744 mw
.loader
.store
.init();
1745 if ( mw
.loader
.store
.enabled
) {
1746 implementations
= [];
1748 batch
= batch
.filter( function ( module
) {
1749 var implementation
= mw
.loader
.store
.get( module
);
1750 if ( implementation
) {
1751 implementations
.push( implementation
);
1752 sourceModules
.push( module
);
1757 asyncEval( implementations
, function ( err
) {
1759 // Not good, the cached mw.loader.implement calls failed! This should
1760 // never happen, barring ResourceLoader bugs, browser bugs and PEBKACs.
1761 // Depending on how corrupt the string is, it is likely that some
1762 // modules' implement() succeeded while the ones after the error will
1763 // never run and leave their modules in the 'loading' state forever.
1764 mw
.loader
.store
.stats
.failed
++;
1766 // Since this is an error not caused by an individual module but by
1767 // something that infected the implement call itself, don't take any
1768 // risks and clear everything in this cache.
1769 mw
.loader
.store
.clear();
1771 mw
.trackError( 'resourceloader.exception', {
1773 source
: 'store-eval'
1775 // Re-add the failed ones that are still pending back to the batch
1776 failed
= sourceModules
.filter( function ( module
) {
1777 return registry
[ module
].state
=== 'loading';
1779 batchRequest( failed
);
1783 batchRequest( batch
);
1787 * Register a source.
1789 * The #work() method will use this information to split up requests by source.
1791 * mw.loader.addSource( { mediawikiwiki: 'https://www.mediawiki.org/w/load.php' } );
1794 * @param {Object} ids An object mapping ids to load.php end point urls
1795 * @throws {Error} If source id is already registered
1797 addSource: function ( ids
) {
1800 if ( id
in sources
) {
1801 throw new Error( 'source already registered: ' + id
);
1803 sources
[ id
] = ids
[ id
];
1808 * Register a module, letting the system know about it and its properties.
1810 * The startup module calls this method.
1812 * When using multiple module registration by passing an array, dependencies that
1813 * are specified as references to modules within the array will be resolved before
1814 * the modules are registered.
1816 * @param {string|Array} modules Module name or array of arrays, each containing
1817 * a list of arguments compatible with this method
1818 * @param {string|number} [version] Module version hash (falls backs to empty string)
1819 * Can also be a number (timestamp) for compatibility with MediaWiki 1.25 and earlier.
1820 * @param {string[]} [dependencies] Array of module names on which this module depends.
1821 * @param {string} [group=null] Group which the module is in
1822 * @param {string} [source='local'] Name of the source
1823 * @param {string} [skip=null] Script body of the skip function
1825 register: function ( modules
) {
1827 if ( typeof modules
=== 'object' ) {
1828 resolveIndexedDependencies( modules
);
1829 // Optimisation: Up to 55% faster.
1830 // Typically called only once, and with a batch.
1831 // See <https://gist.github.com/Krinkle/f06fdb3de62824c6c16f02a0e6ce0e66>
1832 // Benchmarks taught us that the code for adding an object to `registry`
1833 // should actually be inline, or in a simple function that does no
1834 // arguments manipulation, and isn't also the caller itself.
1835 // JS semantics make it hard to optimise recursion to a different
1836 // signature of itself.
1837 for ( i
= 0; i
< modules
.length
; i
++ ) {
1838 registerOne
.apply( null, modules
[ i
] );
1841 registerOne
.apply( null, arguments
);
1846 * Implement a module given the components that make up the module.
1848 * When #load() or #using() requests one or more modules, the server
1849 * response contain calls to this function.
1851 * @param {string} module Name of module and current module version. Formatted
1852 * as '`[name]@[version]`". This version should match the requested version
1853 * (from #batchRequest and #registry). This avoids race conditions (T117587).
1854 * For back-compat with MediaWiki 1.27 and earlier, the version may be omitted.
1855 * @param {Function|Array|string} [script] Function with module code, list of URLs
1856 * to load via `<script src>`, or string of module code for `$.globalEval()`.
1857 * @param {Object} [style] Should follow one of the following patterns:
1859 * { "css": [css, ..] }
1860 * { "url": { <media>: [url, ..] } }
1862 * And for backwards compatibility (needs to be supported forever due to caching):
1865 * { <media>: [url, ..] }
1867 * The reason css strings are not concatenated anymore is T33676. We now check
1868 * whether it's safe to extend the stylesheet.
1871 * @param {Object} [messages] List of key/value pairs to be added to mw#messages.
1872 * @param {Object} [templates] List of key/value pairs to be added to mw#templates.
1874 implement: function ( module
, script
, style
, messages
, templates
) {
1875 var split
= splitModuleKey( module
),
1877 version
= split
.version
;
1878 // Automatically register module
1879 if ( !( name
in registry
) ) {
1880 mw
.loader
.register( name
);
1882 // Check for duplicate implementation
1883 if ( registry
[ name
].script
!== undefined ) {
1884 throw new Error( 'module already implemented: ' + name
);
1887 // Without this reset, if there is a version mismatch between the
1888 // requested and received module version, then mw.loader.store would
1889 // cache the response under the requested key. Thus poisoning the cache
1890 // indefinitely with a stale value. (T117587)
1891 registry
[ name
].version
= version
;
1893 // Attach components
1894 registry
[ name
].script
= script
|| null;
1895 registry
[ name
].style
= style
|| null;
1896 registry
[ name
].messages
= messages
|| null;
1897 registry
[ name
].templates
= templates
|| null;
1898 // The module may already have been marked as erroneous
1899 if ( registry
[ name
].state
!== 'error' && registry
[ name
].state
!== 'missing' ) {
1900 setAndPropagate( name
, 'loaded' );
1905 * Load an external script or one or more modules.
1907 * This method takes a list of unrelated modules. Use cases:
1909 * - A web page will be composed of many different widgets. These widgets independently
1910 * queue their ResourceLoader modules (`OutputPage::addModules()`). If any of them
1911 * have problems, or are no longer known (e.g. cached HTML), the other modules
1912 * should still be loaded.
1913 * - This method is used for preloading, which must not throw. Later code that
1914 * calls #using() will handle the error.
1916 * @param {string|Array} modules Either the name of a module, array of modules,
1917 * or a URL of an external script or style
1918 * @param {string} [type='text/javascript'] MIME type to use if calling with a URL of an
1919 * external script or style; acceptable values are "text/css" and
1920 * "text/javascript"; if no type is provided, text/javascript is assumed.
1922 load: function ( modules
, type
) {
1925 // Allow calling with a url or single dependency as a string
1926 if ( typeof modules
=== 'string' ) {
1927 // "https://example.org/x.js", "http://example.org/x.js", "//example.org/x.js", "/x.js"
1928 if ( /^(https?:)?\/?\//.test( modules
) ) {
1929 if ( type
=== 'text/css' ) {
1930 l
= document
.createElement( 'link' );
1931 l
.rel
= 'stylesheet';
1933 document
.head
.appendChild( l
);
1936 if ( type
=== 'text/javascript' || type
=== undefined ) {
1937 addScript( modules
);
1941 throw new Error( 'invalid type for external url, must be text/css or text/javascript. not ' + type
);
1943 // Called with single module
1944 modules
= [ modules
];
1947 // Filter out top-level modules that are unknown or failed to load before.
1948 filtered
= modules
.filter( function ( module
) {
1949 var state
= mw
.loader
.getState( module
);
1950 return state
!== 'error' && state
!== 'missing';
1952 // Resolve remaining list using the known dependency tree.
1953 // This also filters out modules with unknown dependencies. (T36853)
1954 filtered
= resolveStubbornly( filtered
);
1955 // Some modules are not yet ready, add to module load queue.
1956 enqueue( filtered
, undefined, undefined );
1960 * Change the state of one or more modules.
1962 * @param {Object} states Object of module name/state pairs
1964 state: function ( states
) {
1966 for ( module
in states
) {
1967 state
= states
[ module
];
1968 if ( !( module
in registry
) ) {
1969 mw
.loader
.register( module
);
1971 setAndPropagate( module
, state
);
1976 * Get the version of a module.
1978 * @param {string} module Name of module
1979 * @return {string|null} The version, or null if the module (or its version) is not
1982 getVersion: function ( module
) {
1983 return module
in registry
? registry
[ module
].version
: null;
1987 * Get the state of a module.
1989 * @param {string} module Name of module
1990 * @return {string|null} The state, or null if the module (or its state) is not
1993 getState: function ( module
) {
1994 return module
in registry
? registry
[ module
].state
: null;
1998 * Get the names of all registered modules.
2002 getModuleNames: function () {
2003 return Object
.keys( registry
);
2007 * Get the exported value of a module.
2009 * This static method is publicly exposed for debugging purposes
2010 * only and must not be used in production code. In production code,
2011 * please use the dynamically provided `require()` function instead.
2013 * In case of lazy-loaded modules via mw.loader#using(), the returned
2014 * Promise provides the function, see #using() for examples.
2018 * @param {string} moduleName Module name
2019 * @return {Mixed} Exported value
2021 require: function ( moduleName
) {
2022 var state
= mw
.loader
.getState( moduleName
);
2024 // Only ready modules can be required
2025 if ( state
!== 'ready' ) {
2026 // Module may've forgotten to declare a dependency
2027 throw new Error( 'Module "' + moduleName
+ '" is not loaded.' );
2030 return registry
[ moduleName
].module
.exports
;
2034 * On browsers that implement the localStorage API, the module store serves as a
2035 * smart complement to the browser cache. Unlike the browser cache, the module store
2036 * can slice a concatenated response from ResourceLoader into its constituent
2037 * modules and cache each of them separately, using each module's versioning scheme
2038 * to determine when the cache should be invalidated.
2042 * @class mw.loader.store
2045 // Whether the store is in use on this page.
2048 // Modules whose string representation exceeds 100 kB are
2049 // ineligible for storage. See bug T66721.
2050 MODULE_SIZE_MAX
: 100 * 1000,
2052 // The contents of the store, mapping '[name]@[version]' keys
2053 // to module implementations.
2056 // Names of modules to be stored during the next update.
2057 // See add() and update().
2061 stats
: { hits
: 0, misses
: 0, expired
: 0, failed
: 0 },
2064 * Construct a JSON-serializable object representing the content of the store.
2066 * @return {Object} Module store contents.
2068 toJSON: function () {
2069 return { items
: mw
.loader
.store
.items
, vary
: mw
.loader
.store
.getVary() };
2073 * Get the localStorage key for the entire module store. The key references
2074 * $wgDBname to prevent clashes between wikis which share a common host.
2076 * @return {string} localStorage item key
2078 getStoreKey: function () {
2079 return 'MediaWikiModuleStore:' + mw
.config
.get( 'wgDBname' );
2083 * Get a key on which to vary the module cache.
2085 * @return {string} String of concatenated vary conditions.
2087 getVary: function () {
2088 return mw
.config
.get( 'skin' ) + ':' +
2089 mw
.config
.get( 'wgResourceLoaderStorageVersion' ) + ':' +
2090 mw
.config
.get( 'wgUserLanguage' );
2094 * Initialize the store.
2096 * Retrieves store from localStorage and (if successfully retrieved) decoding
2097 * the stored JSON value to a plain object.
2099 * The try / catch block is used for JSON & localStorage feature detection.
2100 * See the in-line documentation for Modernizr's localStorage feature detection
2101 * code for a full account of why we need a try / catch:
2102 * <https://github.com/Modernizr/Modernizr/blob/v2.7.1/modernizr.js#L771-L796>.
2107 if ( this.enabled
!== null ) {
2113 // Disabled because localStorage quotas are tight and (in Firefox's case)
2114 // shared by multiple origins.
2115 // See T66721, and <https://bugzilla.mozilla.org/show_bug.cgi?id=1064466>.
2116 /Firefox/.test( navigator
.userAgent
) ||
2118 // Disabled by configuration.
2119 !mw
.config
.get( 'wgResourceLoaderStorageEnabled' )
2121 // Clear any previous store to free up space. (T66721)
2123 this.enabled
= false;
2126 if ( mw
.config
.get( 'debug' ) ) {
2127 // Disable module store in debug mode
2128 this.enabled
= false;
2133 // This a string we stored, or `null` if the key does not (yet) exist.
2134 raw
= localStorage
.getItem( this.getStoreKey() );
2135 // If we get here, localStorage is available; mark enabled
2136 this.enabled
= true;
2137 // If null, JSON.parse() will cast to string and re-parse, still null.
2138 data
= JSON
.parse( raw
);
2139 if ( data
&& typeof data
.items
=== 'object' && data
.vary
=== this.getVary() ) {
2140 this.items
= data
.items
;
2144 mw
.trackError( 'resourceloader.exception', {
2146 source
: 'store-localstorage-init'
2150 // If we get here, one of four things happened:
2152 // 1. localStorage did not contain our store key.
2153 // This means `raw` is `null`, and we're on a fresh page view (cold cache).
2154 // The store was enabled, and `items` starts fresh.
2156 // 2. localStorage contained parseable data under our store key,
2157 // but it's not applicable to our current context (see getVary).
2158 // The store was enabled, and `items` starts fresh.
2160 // 3. JSON.parse threw (localStorage contained corrupt data).
2161 // This means `raw` contains a string.
2162 // The store was enabled, and `items` starts fresh.
2164 // 4. localStorage threw (disabled or otherwise unavailable).
2165 // This means `raw` was never assigned.
2166 // We will disable the store below.
2167 if ( raw
=== undefined ) {
2168 // localStorage failed; disable store
2169 this.enabled
= false;
2174 * Retrieve a module from the store and update cache hit stats.
2176 * @param {string} module Module name
2177 * @return {string|boolean} Module implementation or false if unavailable
2179 get: function ( module
) {
2182 if ( !this.enabled
) {
2186 key
= getModuleKey( module
);
2187 if ( key
in this.items
) {
2189 return this.items
[ key
];
2191 this.stats
.misses
++;
2196 * Queue the name of a module that the next update should consider storing.
2199 * @param {string} module Module name
2201 add: function ( module
) {
2202 if ( !this.enabled
) {
2205 this.queue
.push( module
);
2206 this.requestUpdate();
2210 * Add the contents of the named module to the in-memory store.
2212 * This method does not guarantee that the module will be stored.
2213 * Inspection of the module's meta data and size will ultimately decide that.
2215 * This method is considered internal to mw.loader.store and must only
2216 * be called if the store is enabled.
2219 * @param {string} module Module name
2221 set: function ( module
) {
2223 descriptor
= mw
.loader
.moduleRegistry
[ module
];
2225 key
= getModuleKey( module
);
2228 // Already stored a copy of this exact version
2229 key
in this.items
||
2230 // Module failed to load
2232 descriptor
.state
!== 'ready' ||
2233 // Unversioned, private, or site-/user-specific
2234 !descriptor
.version
||
2235 descriptor
.group
=== 'private' ||
2236 descriptor
.group
=== 'user' ||
2237 // Partial descriptor
2238 // (e.g. skipped module, or style module with state=ready)
2239 [ descriptor
.script
, descriptor
.style
, descriptor
.messages
,
2240 descriptor
.templates
].indexOf( undefined ) !== -1
2248 JSON
.stringify( key
),
2249 typeof descriptor
.script
=== 'function' ?
2250 String( descriptor
.script
) :
2251 JSON
.stringify( descriptor
.script
),
2252 JSON
.stringify( descriptor
.style
),
2253 JSON
.stringify( descriptor
.messages
),
2254 JSON
.stringify( descriptor
.templates
)
2257 mw
.trackError( 'resourceloader.exception', {
2259 source
: 'store-localstorage-json'
2264 src
= 'mw.loader.implement(' + args
.join( ',' ) + ');';
2265 if ( src
.length
> this.MODULE_SIZE_MAX
) {
2268 this.items
[ key
] = src
;
2272 * Iterate through the module store, removing any item that does not correspond
2273 * (in name and version) to an item in the module registry.
2275 prune: function () {
2278 for ( key
in this.items
) {
2279 module
= key
.slice( 0, key
.indexOf( '@' ) );
2280 if ( getModuleKey( module
) !== key
) {
2281 this.stats
.expired
++;
2282 delete this.items
[ key
];
2283 } else if ( this.items
[ key
].length
> this.MODULE_SIZE_MAX
) {
2284 // This value predates the enforcement of a size limit on cached modules.
2285 delete this.items
[ key
];
2291 * Clear the entire module store right now.
2293 clear: function () {
2296 localStorage
.removeItem( this.getStoreKey() );
2301 * Request a sync of the in-memory store back to persisted localStorage.
2303 * This function debounces updates. The debouncing logic should account
2304 * for the following factors:
2306 * - Writing to localStorage is an expensive operation that must not happen
2307 * during the critical path of initialising and executing module code.
2308 * Instead, it should happen at a later time after modules have been given
2309 * time and priority to do their thing first.
2311 * - This method is called from mw.loader.store.add(), which will be called
2312 * hundreds of times on a typical page, including within the same call-stack
2313 * and eventloop-tick. This is because responses from load.php happen in
2314 * batches. As such, we want to allow all modules from the same load.php
2315 * response to be written to disk with a single flush, not many.
2317 * - Repeatedly deleting and creating timers is non-trivial.
2319 * - localStorage is shared by all pages from the same origin, if multiple
2320 * pages are loaded with different module sets, the possibility exists that
2321 * modules saved by one page will be clobbered by another. The impact of
2322 * this is minor, it merely causes a less efficient cache use, and the
2323 * problem would be corrected by subsequent page views.
2325 * This method is considered internal to mw.loader.store and must only
2326 * be called if the store is enabled.
2331 requestUpdate
: ( function () {
2332 var hasPendingWrites
= false;
2334 function flushWrites() {
2337 // Remove anything from the in-memory store that came from previous page
2338 // loads that no longer corresponds with current module names and versions.
2339 mw
.loader
.store
.prune();
2340 // Process queued module names, serialise their contents to the in-memory store.
2341 while ( mw
.loader
.store
.queue
.length
) {
2342 mw
.loader
.store
.set( mw
.loader
.store
.queue
.shift() );
2345 key
= mw
.loader
.store
.getStoreKey();
2347 // Replacing the content of the module store might fail if the new
2348 // contents would exceed the browser's localStorage size limit. To
2349 // avoid clogging the browser with stale data, always remove the old
2350 // value before attempting to set the new one.
2351 localStorage
.removeItem( key
);
2352 data
= JSON
.stringify( mw
.loader
.store
);
2353 localStorage
.setItem( key
, data
);
2355 mw
.trackError( 'resourceloader.exception', {
2357 source
: 'store-localstorage-update'
2361 // Let the next call to requestUpdate() create a new timer.
2362 hasPendingWrites
= false;
2365 function onTimeout() {
2366 // Defer the actual write via requestIdleCallback
2367 mw
.requestIdleCallback( flushWrites
);
2370 return function () {
2371 // On the first call to requestUpdate(), create a timer that
2372 // waits at least two seconds, then calls onTimeout.
2373 // The main purpose is to allow the current batch of load.php
2374 // responses to complete before we do anything. This batch can
2375 // trigger many hundreds of calls to requestUpdate().
2376 if ( !hasPendingWrites
) {
2377 hasPendingWrites
= true;
2378 setTimeout( onTimeout
, 2000 );
2386 // Skeleton user object, extended by the 'mediawiki.user' module.
2393 * @property {mw.Map}
2397 * @property {mw.Map}
2402 // OOUI widgets specific to MediaWiki
2407 // Attach to window and globally alias
2408 window
.mw
= window
.mediaWiki
= mw
;