User:Monochromatic Bunny/core.js

// /** * Base library for MediaWiki. * * Exposed globally as `mediaWiki` with `mw` as shortcut. * * @class mw * @alternateClassName mediaWiki * @singleton */ /*jshint latedef:false */ ( function ( $ ) {	'use strict';

var mw, hasOwn = Object.prototype.hasOwnProperty, slice = Array.prototype.slice, trackCallbacks = $.Callbacks( 'memory' ), trackHandlers = [], trackQueue = [];

/**	 * FNV132 hash function *	 * This function implements the 32-bit version of FNV-1. * It is equivalent to hash( 'fnv132', ... ) in PHP, except * its output is base 36 rather than hex. * See  *	 * @private * @param {string} str String to hash * @return {string} hash as an seven-character base 36 string */	function fnv132( str ) { /*jshint bitwise:false */ var hash = 0x811C9DC5, i;

for ( i = 0; i < str.length; i++ ) { hash += ( hash << 1 ) + ( hash << 4 ) + ( hash << 7 ) + ( hash << 8 ) + ( hash << 24 ); hash ^= str.charCodeAt( i ); }

hash = ( hash >>> 0 ).toString( 36 ); while ( hash.length < 7 ) { hash = '0' + hash; }

return hash; }

/**	 * Create an object that can be read from or written to from methods that allow * interaction both with single and multiple properties at once. *	 *    @example *	 *    var collection, query, results; *	 *    // Create your address book *    collection = new mw.Map; *	 *    // This data could be coming from an external source (eg. API/AJAX) *    collection.set( {	 *         'John Doe': 'john@example.org',	 *         'Jane Doe': 'jane@example.org',	 *         'George van Halen': 'gvanhalen@example.org'	 *     } ); *	 *    wanted = ['John Doe', 'Jane Doe', 'Daniel Jackson']; *	 *    // You can detect missing keys first *    if ( !collection.exists( wanted ) ) { *        // One or more are missing (in this case: "Daniel Jackson") *        mw.log( 'One or more names were not found in your address book' ); *    }	 *	 *     // Or just let it give you what it can. Optionally fill in from a default. *    results = collection.get( wanted, 'nobody@example.com' ); *    mw.log( results['Jane Doe'] ); // "jane@example.org" *    mw.log( results['Daniel Jackson'] ); // "nobody@example.com" *	 * @class mw.Map *	 * @constructor * @param {Object|boolean} [values] The value-baring object to be mapped. Defaults to an * empty object. * For backwards-compatibility with mw.config, this can also be `true` in which case values * are copied to the Window object as global variables (T72470). Values are copied in * one direction only. Changes to globals are not reflected in the map. */	function Map( values ) { if ( values === true ) { this.values = {};

// Override #set to also set the global variable this.set = function ( selection, value ) { var s;

if ( $.isPlainObject( selection ) ) { for ( s in selection ) { setGlobalMapValue( this, s, selection[ s ] ); }					return true; }				if ( typeof selection === 'string' && arguments.length ) { setGlobalMapValue( this, selection, value ); return true; }				return false; };

return; }

this.values = values || {}; }

/**	 * Alias property to the global object. *	 * @private * @static * @param {mw.Map} map * @param {string} key * @param {Mixed} value */	function setGlobalMapValue( map, key, value ) { map.values[ key ] = value; mw.log.deprecate(				window,				key,				value,				// Deprecation notice for mw.config globals (T58550, T72470)				map === mw.config && 'Use mw.config instead.'		); }

Map.prototype = { /**		 * Get the value of one or more keys. *		 * If called with no arguments, all values are returned. *		 * @param {string|Array} [selection] Key or array of keys to retrieve values for. * @param {Mixed} [fallback=null] Value for keys that don't exist. * @return {Mixed|Object| null} If selection was a string, returns the value, * If selection was an array, returns an object of key/values. * If no selection is passed, the 'values' container is returned. (Beware that,		 * as is the default in JavaScript, the object is returned by reference.) */		get: function ( selection, fallback ) { var results, i;			// If we only do this in the `return` block, it'll fail for the // call to get from the mutli-selection block. fallback = arguments.length > 1 ? fallback : null;

if ( $.isArray( selection ) ) { selection = slice.call( selection ); results = {}; for ( i = 0; i < selection.length; i++ ) { results[ selection[ i ] ] = this.get( selection[ i ], fallback ); }				return results; }

if ( typeof selection === 'string' ) { if ( !hasOwn.call( this.values, selection ) ) { return fallback; }				return this.values[ selection ]; }

if ( selection === undefined ) { return this.values; }

// Invalid selection key return null; },

/**		 * Set one or more key/value pairs. *		 * @param {string|Object} selection Key to set value for, or object mapping keys to values * @param {Mixed} [value] Value to set (optional, only in use when key is a string) * @return {boolean} True on success, false on failure */		set: function ( selection, value ) { var s;

if ( $.isPlainObject( selection ) ) { for ( s in selection ) { this.values[ s ] = selection[ s ]; }				return true; }			if ( typeof selection === 'string' && arguments.length > 1 ) { this.values[ selection ] = value; return true; }			return false; },

/**		 * Check if one or more keys exist. *		 * @param {Mixed} selection Key or array of keys to check * @return {boolean} True if the key(s) exist */		exists: function ( selection ) { var s;

if ( $.isArray( selection ) ) { for ( s = 0; s < selection.length; s++ ) { if ( typeof selection[ s ] !== 'string' || !hasOwn.call( this.values, selection[ s ] ) ) { return false; }				}				return true; }			return typeof selection === 'string' && hasOwn.call( this.values, selection ); }	};

/**	 * Object constructor for messages. *	 * Similar to the Message class in MediaWiki PHP. *	 * Format defaults to 'text'. *	 *    @example *	 *    var obj, str; *    mw.messages.set( {	 *         'hello': 'Hello world',	 *         'hello-user': 'Hello, $1!',	 *         'welcome-user': 'Welcome back to $2, $1! Last visit by $1: $3'	 *     } ); *	 *    obj = new mw.Message( mw.messages, 'hello' ); *    mw.log( obj.text ); *    // Hello world *	 *    obj = new mw.Message( mw.messages, 'hello-user', [ 'John Doe' ] ); *    mw.log( obj.text ); *    // Hello, John Doe! *	 *    obj = new mw.Message( mw.messages, 'welcome-user', [ 'John Doe', 'Wikipedia', '2 hours ago' ] ); *    mw.log( obj.text ); *    // Welcome back to Wikipedia, John Doe! Last visit by John Doe: 2 hours ago *	 *    // Using mw.message shortcut *    obj = mw.message( 'hello-user', 'John Doe' ); *    mw.log( obj.text ); *    // Hello, John Doe! *	 *    // Using mw.msg shortcut *    str = mw.msg( 'hello-user', 'John Doe' ); *    mw.log( str ); *    // Hello, John Doe! *	 *    // Different formats *    obj = new mw.Message( mw.messages, 'hello-user', [ 'John "Wiki" <3 Doe' ] ); *	 *    obj.format = 'text'; *    str = obj.toString; *    // Same as: *    str = obj.text; *	 *    mw.log( str ); *    // Hello, John "Wiki" <3 Doe! *	 *    mw.log( obj.escaped ); *    // Hello, John &quot;Wiki&quot; &lt;3 Doe! *	 * @class mw.Message *	 * @constructor * @param {mw.Map} map Message store * @param {string} key * @param {Array} [parameters] */	function Message( map, key, parameters ) { this.format = 'text'; this.map = map; this.key = key; this.parameters = parameters === undefined ? [] : slice.call( parameters ); return this; }

Message.prototype = { /**		 * Get parsed contents of the message. *		 * The default parser does simple $N replacements and nothing else. * This may be overridden to provide a more complex message parser. * The primary override is in the mediawiki.jqueryMsg module. *		 * This function will not be called for nonexistent messages. *		 * @return {string} Parsed message */		parser: function { return mw.format.apply( null, [ this.map.get( this.key ) ].concat( this.parameters ) ); },

/**		 * Add (does not replace) parameters for `$N` placeholder values. *		 * @param {Array} parameters * @chainable */		params: function ( parameters ) { var i;			for ( i = 0; i < parameters.length; i++ ) { this.parameters.push( parameters[ i ] ); }			return this; },

/**		 * Convert message object to its string form based on current format. *		 * @return {string} Message as a string in the current form, or ` ` if key * does not exist. */		toString: function { var text;

if ( !this.exists ) { // Use as text if key does not exist if ( this.format === 'escaped' || this.format === 'parse' ) { // format 'escaped' and 'parse' need to have the brackets and key html escaped return mw.html.escape( '<' + this.key + '>' ); }				return '<' + this.key + '>'; }

if ( this.format === 'plain' || this.format === 'text' || this.format === 'parse' ) { text = this.parser; }

if ( this.format === 'escaped' ) { text = this.parser; text = mw.html.escape( text ); }

return text; },

/**		 * Change format to 'parse' and convert message to string *		 * If jqueryMsg is loaded, this parses the message text from wikitext * (where supported) to HTML *		 * Otherwise, it is equivalent to plain. *		 * @return {string} String form of parsed message */		parse: function { this.format = 'parse'; return this.toString; },

/**		 * Change format to 'plain' and convert message to string *		 * This substitutes parameters, but otherwise does not change the * message text. *		 * @return {string} String form of plain message */		plain: function { this.format = 'plain'; return this.toString; },

/**		 * Change format to 'text' and convert message to string *		 * If jqueryMsg is loaded, {{-transformation is done where supported * (such as {{plural:}}, {{gender:}}, {{int:}}). *		 * Otherwise, it is equivalent to plain *		 * @return {string} String form of text message */		text: function { this.format = 'text'; return this.toString; },

/**		 * Change the format to 'escaped' and convert message to string *		 * This is equivalent to using the 'text' format (see #text), then * HTML-escaping the output. *		 * @return {string} String form of html escaped message */		escaped: function { this.format = 'escaped'; return this.toString; },

/**		 * Check if a message exists *		 * @see mw.Map#exists * @return {boolean} */		exists: function { return this.map.exists( this.key ); }	};

/**	 * @class mw	 */ mw = {

/**		 * Get the current time, measured in milliseconds since January 1, 1970 (UTC). *		 * On browsers that implement the Navigation Timing API, this function will produce floating-point * values with microsecond precision that are guaranteed to be monotonic. On all other browsers, * it will fall back to using `Date`. *		 * @return {number} Current time */		now: ( function {			var perf = window.performance,				navStart = perf && perf.timing && perf.timing.navigationStart;			return navStart && typeof perf.now === 'function' ?				function  { return navStart + perf.now; } :				function  { return +new Date; };		} ),

/**		 * Format a string. Replace $1, $2 ... $N with positional arguments. *		 * Used by Message#parser. *		 * @since 1.25 * @param {string} formatString Format string * @param {...Mixed} parameters Values for $N replacements * @return {string} Formatted string */		format: function ( formatString ) { var parameters = slice.call( arguments, 1 ); return formatString.replace( /\$(\d+)/g, function ( str, match ) {				var index = parseInt( match, 10 ) - 1;				return parameters[ index ] !== undefined ? parameters[ index ] : '$' + match;			} ); },

/**		 * Track an analytic event. *		 * This method provides a generic means for MediaWiki JavaScript code to capture state * information for analysis. Each logged event specifies a string topic name that describes * the kind of event that it is. Topic names consist of dot-separated path components, * arranged from most general to most specific. Each path component should have a clear and * well-defined purpose. *		 * Data handlers are registered via `mw.trackSubscribe`, and receive the full set of		 * events that match their subcription, including those that fired before the handler was * bound. *		 * @param {string} topic Topic name * @param {Object} [data] Data describing the event, encoded as an object */		track: function ( topic, data ) { trackQueue.push( { topic: topic, timeStamp: mw.now, data: data } ); trackCallbacks.fire( trackQueue ); },

/**		 * Register a handler for subset of analytic events, specified by topic. *		 * Handlers will be called once for each tracked event, including any events that fired before the * handler was registered; 'this' is set to a plain object with a 'timeStamp' property indicating * the exact time at which the event fired, a string 'topic' property naming the event, and a * 'data' property which is an object of event-specific data. The event topic and event data are * also passed to the callback as the first and second arguments, respectively. *		 * @param {string} topic Handle events whose name starts with this string prefix * @param {Function} callback Handler to call for each matching tracked event * @param {string} callback.topic * @param {Object} [callback.data] */		trackSubscribe: function ( topic, callback ) { var seen = 0; function handler( trackQueue ) { var event; for (seen < trackQueue.length; seen++ ) { event = trackQueue[ seen ]; if ( event.topic.indexOf( topic ) === 0 ) { callback.call( event, event.topic, event.data ); }				}			}

trackHandlers.push( [ handler, callback ] );

trackCallbacks.add( handler ); },

/**		 * Stop handling events for a particular handler *		 * @param {Function} callback */		trackUnsubscribe: function ( callback ) { trackHandlers = $.grep( trackHandlers, function ( fns ) {				if ( fns[ 1 ] === callback ) {					trackCallbacks.remove( fns[ 0 ] );					// Ensure the tuple is removed to avoid holding on to closures					return false;				}				return true;			} ); },

// Expose Map constructor Map: Map,

// Expose Message constructor Message: Message,

/**		 * Map of configuration values. *		 * Check out [the complete list of configuration values](https://www.mediawiki.org/wiki/Manual:Interface/JavaScript#mw.config) * on mediawiki.org. *		 * If `$wgLegacyJavaScriptGlobals` is true, this Map will add its values to the * global `window` object. *		 * @property {mw.Map} config */		// Dummy placeholder later assigned in ResourceLoaderStartUpModule config: null,

/**		 * Empty object for third-party libraries, for cases where you don't		 * want to add a new global, or the global is bad and needs containment * or wrapping. *		 * @property */		libs: {},

/**		 * Access container for deprecated functionality that can be moved from * from their legacy location and attached to this object (e.g. a global		 * function that is deprecated and as stop-gap can be exposed through here). *		 * This was reserved for future use but never ended up being used. *		 * @deprecated since 1.22 Let deprecated identifiers keep their original name * and use mw.log#deprecate to create an access container for tracking. * @property */		legacy: {},

/**		 * Store for messages. *		 * @property {mw.Map} */		messages: new Map,

/**		 * Store for templates associated with a module. *		 * @property {mw.Map} */		templates: new Map,

/**		 * Get a message object. *		 * Shortcut for `new mw.Message( mw.messages, key, parameters )`. *		 * @see mw.Message * @param {string} key Key of message to get * @param {...Mixed} parameters Values for $N replacements * @return {mw.Message} */		message: function ( key ) { var parameters = slice.call( arguments, 1 ); return new Message( mw.messages, key, parameters ); },

/**		 * Get a message string using the (default) 'text' format. *		 * Shortcut for `mw.message( key, parameters... ).text`. *		 * @see mw.Message * @param {string} key Key of message to get * @param {...Mixed} parameters Values for $N replacements * @return {string} */		msg: function { return mw.message.apply( mw.message, arguments ).toString; },

/**		 * Dummy placeholder for {@link mw.log} *		 * @method */		log: ( function {			// Also update the restoration of methods in mediawiki.log.js			// when adding or removing methods here.			var log = function  {},				console = window.console;

/**			 * @class mw.log * @singleton */

/**			 * Write a message to the console's warning channel. * Actions not supported by the browser console are silently ignored. *			 * @param {...string} msg Messages to output to console */			log.warn = console && console.warn && Function.prototype.bind ? Function.prototype.bind.call( console.warn, console ) : $.noop;

/**			 * Write a message to the console's error channel. *			 * Most browsers provide a stacktrace by default if the argument * is a caught Error object. *			 * @since 1.26 * @param {Error|...string} msg Messages to output to console */			log.error = console && console.error && Function.prototype.bind ? Function.prototype.bind.call( console.error, console ) : $.noop;

/**			 * Create a property in a host object that, when accessed, will produce * a deprecation warning in the console with backtrace. *			 * @param {Object} obj Host object of deprecated property * @param {string} key Name of property to create in `obj` * @param {Mixed} val The value this property should return when accessed * @param {string} [msg] Optional text to include in the deprecation message */			log.deprecate = !Object.defineProperty ? function ( obj, key, val ) { obj[ key ] = val; } : function ( obj, key, val, msg ) { msg = 'Use of "' + key + '" is deprecated.' + ( msg ? ( ' ' + msg ) : '' ); Object.defineProperty( obj, key, {					configurable: true,					enumerable: true,					get: function {						mw.track( 'mw.deprecate', key );						mw.log.warn( msg );						return val;					},					set: function ( newVal ) {						mw.track( 'mw.deprecate', key );						mw.log.warn( msg );						val = newVal;					}				} );

};

return log; } ),

/**		 * Client for ResourceLoader server end point. *		 * This client is in charge of maintaining the module registry and state * machine, initiating network (batch) requests for loading modules, as * well as dependency resolution and execution of source code. *		 * For more information, refer to		 *  *		 * @class mw.loader * @singleton */		loader: ( function {

/**			 * Fired via mw.track on various resource loading errors. *			 * @event resourceloader_exception * @param {Error|Mixed} e The error that was thrown. Almost always an Error *  object, but in theory module code could manually throw something else, and that *  might also end up here. * @param {string} [module] Name of the module which caused the error. Omitted if the *  error is not module-related or the module cannot be easily identified due to *  batched handling. * @param {string} source Source of the error. Possible values: *			 *  - style: stylesheet error (only affects old IE where a special style loading method			 *     is used) *  - load-callback: exception thrown by user callback *  - module-execute: exception thrown by module code *  - store-eval: could not evaluate module code cached in localStorage *  - store-localstorage-init: localStorage or JSON parse error in mw.loader.store.init *  - store-localstorage-json: JSON conversion error in mw.loader.store.set *  - store-localstorage-update: localStorage or JSON conversion error in mw.loader.store.update */

/**			 * Fired via mw.track on resource loading error conditions. *			 * @event resourceloader_assert * @param {string} source Source of the error. Possible values: *			 *  - bug-T59567: failed to cache script due to an Opera function -> string conversion *    bug; see  for details */

/**			 * Mapping of registered modules. *			 * See #implement and #execute for exact details on support for script, style and messages. *			 * Format: *			 *    {			 *         'moduleName': { *            // From mw.loader.register *            'version': '########' (hash) *            'dependencies': ['required.foo', 'bar.also', ...], (or) function  {} *            'group': 'somegroup', (or) null *            'source': 'local', (or) 'anotherwiki' *            'skip': 'return !!window.Example', (or) null *            'module': export Object *			 *            // Set from execute or mw.loader.state *            'state': 'registered', 'loaded', 'loading', 'ready', 'error', or 'missing' *			 *            // Optionally added at run-time by mw.loader.implement *            'skipped': true *            'script': closure, array of urls, or string *            'style': { ... } (see #execute) *            'messages': { 'key': 'value', ... }			 *        }			 *     }			 *			 * State machine: *			 * - `registered`: *   The module is known to the system but not yet requested. *   Meta data is registered via mw.loader#register. Calls to that method are *   generated server-side by the startup module. * - `loading`: *   The module is requested through mw.loader (either directly or as dependency of			 *    another module). The client will be fetching module contents from the server. *   The contents are then stashed in the registry via mw.loader#implement. * - `loaded`: *   The module has been requested from the server and stashed via mw.loader#implement. *   If the module has no more dependencies in-fight, the module will be executed *   right away. Otherwise execution is deferred, controlled via #handlePending. * - `executing`: *   The module is being executed. * - `ready`: *   The module has been successfully executed. * - `error`: *   The module (or one of its dependencies) produced an error during execution. * - `missing`: *   The module was registered client-side and requested, but the server denied knowledge *   of the module's existence. *			 * @property * @private */			var registry = {}, // Mapping of sources, keyed by source-id, values are strings. //				// Format: //				//    {				//         'sourceId': 'http://example.org/w/load.php' //    }				//				sources = {},

// List of modules which will be loaded as when ready batch = [],

// Pending queueModuleScript requests handlingPendingRequests = false, pendingRequests = [],

// List of modules to be loaded queue = [],

/**				 * List of callback jobs waiting for modules to be ready. *				 * Jobs are created by #request and run by #handlePending. *				 * Typically when a job is created for a module, the job's dependencies contain * both the module being requested and all its recursive dependencies. *				 * Format: *				 *    {				 *         'dependencies': [ module names ], *        'ready': Function callback *        'error': Function callback *    }				 *				 * @property {Object[]} jobs * @private */				jobs = [],

// For getMarker marker = null,

// For addEmbeddedCSS cssBuffer = '', cssBufferTimer = null, cssCallbacks = $.Callbacks, isIE9 = document.documentMode === 9;

function getMarker { if ( !marker ) { // Cache marker = document.querySelector( 'meta[name="ResourceLoaderDynamicStyles"]' ); if ( !marker ) { mw.log( 'Create  dynamically' ); marker = $( ' ' ).attr( 'name', 'ResourceLoaderDynamicStyles' ).appendTo( 'head' )[ 0 ]; }				}				return marker; }

/**			 * Create a new style element and add it to the DOM. *			 * @private * @param {string} text CSS text * @param {Node} [nextNode] The element where the style tag * should be inserted before * @return {HTMLElement} Reference to the created style element */			function newStyleTag( text, nextNode ) { var s = document.createElement( 'style' );

s.appendChild( document.createTextNode( text ) ); if ( nextNode && nextNode.parentNode ) { nextNode.parentNode.insertBefore( s, nextNode ); } else { document.getElementsByTagName( 'head' )[ 0 ].appendChild( s ); }

return s;			}

/**			 * Add a bit of CSS text to the current browser page. *			 * The CSS will be appended to an existing ResourceLoader-created ` ` tag * or create a new one based on whether the given `cssText` is safe for extension. *			 * @param {string} [cssText=cssBuffer] If called without cssText, * the internal buffer will be inserted instead. * @param {Function} [callback] */			function addEmbeddedCSS( cssText, callback ) { var $style, styleEl;

function fireCallbacks { var oldCallbacks = cssCallbacks; // Reset cssCallbacks variable so it's not polluted by any calls to					// addEmbeddedCSS from one of the callbacks (T105973) cssCallbacks = $.Callbacks; oldCallbacks.fire.empty; }

if ( callback ) { cssCallbacks.add( callback ); }

// Yield once before creating the tag. This lets multiple stylesheets // accumulate into one buffer, allowing us to reduce how often new stylesheets // are inserted in the browser. Appending a stylesheet and waiting for the // browser to repaint is fairly expensive. (T47810) if ( cssText ) { // Don't extend the buffer if the item needs its own stylesheet. // Keywords like `@import` are only valid at the start of a stylesheet (T37562). if ( !cssBuffer || cssText.slice( 0, '@import'.length ) !== '@import' ) { // Linebreak for somewhat distinguishable sections cssBuffer += '\n' + cssText; // TODO: Using requestAnimationFrame would perform better by not injecting // styles while the browser is busy painting. if ( !cssBufferTimer ) { cssBufferTimer = setTimeout( function {								// Support: Firefox < 13								// Firefox 12 has non-standard behaviour of passing a number								// as first argument to a setTimeout callback.								// http://benalman.com/news/2009/07/the-mysterious-firefox-settime/								addEmbeddedCSS;							} ); }						return; }

// This is a scheduled flush for the buffer } else { cssBufferTimer = null; cssText = cssBuffer; cssBuffer = ''; }

// By default, always create a new. Appending text to a tag is // is a performance anti-pattern as it requires CSS to be reparsed (T47810). //				// Support: IE 6-9 // Try to re-use existing tags due to the IE stylesheet limit (T33676). if ( isIE9 ) { $style = $( getMarker ).prev; // Verify that the element before the marker actually is a tag created // by mw.loader (not some other style tag, or e.g. a tag). if ( $style.data( 'ResourceLoaderDynamicStyleTag' ) ) { styleEl = $style[ 0 ]; styleEl.appendChild( document.createTextNode( cssText ) ); fireCallbacks; return; }					// Else: No existing tag to reuse. Continue below and create the first one. }

$style = $( newStyleTag( cssText, getMarker ) );

if ( isIE9 ) { $style.data( 'ResourceLoaderDynamicStyleTag', true ); }

fireCallbacks; }

/**			 * @since 1.26 * @param {Array} modules List of module names * @return {string} Hash of concatenated version hashes. */			function getCombinedVersion( modules ) { var hashes = $.map( modules, function ( module ) {					return registry[ module ].version;				} ); return fnv132( hashes.join( '' ) ); }

/**			 * Determine whether all dependencies are in state 'ready', which means we may * execute the module or job now. *			 * @private * @param {Array} modules Names of modules to be checked * @return {boolean} True if all modules are in state 'ready', false otherwise */			function allReady( modules ) { var i;				for ( i = 0; i < modules.length; i++ ) { if ( mw.loader.getState( modules[ i ] ) !== 'ready' ) { return false; }				}				return true; }

/**			 * Determine whether all dependencies are in state 'ready', which means we may * execute the module or job now. *			 * @private * @param {Array} modules Names of modules to be checked * @return {boolean} True if no modules are in state 'error' or 'missing', false otherwise */			function anyFailed( modules ) { var i, state; for ( i = 0; i < modules.length; i++ ) { state = mw.loader.getState( modules[ i ] ); if ( state === 'error' || state === 'missing' ) { return true; }				}				return false; }

/**			 * A module has entered state 'ready', 'error', or 'missing'. Automatically update * pending jobs and modules that depend upon this module. If the given module failed, * propagate the 'error' state up the dependency tree. Otherwise, go ahead and execute * all jobs/modules now having their dependencies satisfied. *			 * Jobs that depend on a failed module, will have their error callback ran (if any). *			 * @private * @param {string} module Name of module that entered one of the states 'ready', 'error', or 'missing'. */			function handlePending( module ) { var j, job, hasErrors, m, stateChange;

if ( registry[ module ].state === 'error' || registry[ module ].state === 'missing' ) { // If the current module failed, mark all dependent modules also as failed. // Iterate until steady-state to propagate the error state upwards in the // dependency tree. do { stateChange = false; for ( m in registry ) { if ( registry[ m ].state !== 'error' && registry[ m ].state !== 'missing' ) { if ( anyFailed( registry[ m ].dependencies ) ) { registry[ m ].state = 'error'; stateChange = true; }							}						}					} while ( stateChange ); }

// Execute all jobs whose dependencies are either all satisfied or contain at least one failed module. for ( j = 0; j < jobs.length; j++ ) { hasErrors = anyFailed( jobs[ j ].dependencies ); if ( hasErrors || allReady( jobs[ j ].dependencies ) ) { // All dependencies satisfied, or some have errors job = jobs[ j ]; jobs.splice( j, 1 ); j -= 1; try { if ( hasErrors ) { if ( $.isFunction( job.error ) ) { job.error( new Error( 'Module ' + module + ' has failed dependencies' ), [ module ] ); }							} else { if ( $.isFunction( job.ready ) ) { job.ready; }							}						} catch ( e ) { // A user-defined callback raised an exception. // Swallow it to protect our state machine! mw.track( 'resourceloader.exception', { exception: e, module: module, source: 'load-callback' } ); }					}				}

if ( registry[ module ].state === 'ready' ) { // The current module became 'ready'. Set it in the module store, and recursively execute all // dependent modules that are loaded and now have all dependencies satisfied. mw.loader.store.set( module, registry[ module ] ); for ( m in registry ) { if ( registry[ m ].state === 'loaded' && allReady( registry[ m ].dependencies ) ) { execute( m ); }					}				}			}

/**			 * Resolve dependencies and detect circular references. *			 * @private * @param {string} module Name of the top-level module whose dependencies shall be * resolved and sorted. * @param {Array} resolved Returns a topological sort of the given module and its * dependencies, such that later modules depend on earlier modules. The array * contains the module names. If the array contains already some module names, * this function appends its result to the pre-existing array. * @param {Object} [unresolved] Hash used to track the current dependency * chain; used to report loops in the dependency graph. * @throws {Error} If any unregistered module or a dependency loop is encountered */			function sortDependencies( module, resolved, unresolved ) { var i, deps, skip;

if ( !hasOwn.call( registry, module ) ) { throw new Error( 'Unknown dependency: ' + module ); }

if ( registry[ module ].skip !== null ) { /*jshint evil:true */ skip = new Function( registry[ module ].skip ); registry[ module ].skip = null; if ( skip ) { registry[ module ].skipped = true; registry[ module ].dependencies = []; registry[ module ].state = 'ready'; handlePending( module ); return; }				}

// Resolves dynamic loader function and replaces it with its own results if ( $.isFunction( registry[ module ].dependencies ) ) { registry[ module ].dependencies = registry[ module ].dependencies; // Ensures the module's dependencies are always in an array if ( typeof registry[ module ].dependencies !== 'object' ) { registry[ module ].dependencies = [ registry[ module ].dependencies ]; }				}				if ( $.inArray( module, resolved ) !== -1 ) { // Module already resolved; nothing to do					return; }				// Create unresolved if not passed in				if ( !unresolved ) { unresolved = {}; }				// Tracks down dependencies deps = registry[ module ].dependencies; for ( i = 0; i < deps.length; i++ ) { if ( $.inArray( deps[ i ], resolved ) === -1 ) { if ( unresolved[ deps[ i ] ] ) { throw new Error( mw.format( 'Circular reference detected: $1 -> $2', module, deps[ i ] ) );						}

// Add to unresolved unresolved[ module ] = true; sortDependencies( deps[ i ], resolved, unresolved ); }				}				resolved.push( module ); }

/**			 * Get names of module that a module depends on, in their proper dependency order. *			 * @private * @param {string[]} modules Array of string module names * @return {Array} List of dependencies, including 'module'. */			function resolve( modules ) { var resolved = []; $.each( modules, function ( idx, module ) {					sortDependencies( module, resolved );				} ); return resolved; }

/**			 * Load and execute a script. *			 * @private * @param {string} src URL to script, will be used as the src attribute in the script tag * @return {jQuery.Promise} */			function addScript( src ) { return $.ajax( {					url: src,					dataType: 'script',					// Force jQuery behaviour to be for crossDomain. Otherwise jQuery would use					// XHR for a same domain request instead of, which changes the request					// headers (potentially missing a cache hit), and reduces caching in general					// since browsers cache XHR much less (if at all). And XHR means we retreive					// text, so we'd need to $.globalEval, which then messes up line numbers.					crossDomain: true,					cache: true				} ); }

/**			 * Queue the loading and execution of a script for a particular module. *			 * @private * @param {string} src URL of the script * @param {string} [moduleName] Name of currently executing module * @return {jQuery.Promise} */			function queueModuleScript( src, moduleName ) { var r = $.Deferred;

pendingRequests.push( function {					if ( moduleName && hasOwn.call( registry, moduleName ) ) {						window.require = mw.loader.require;						window.module = registry[ moduleName ].module;					}					addScript( src ).always( function  { // Clear environment delete window.require; delete window.module; r.resolve;

// Start the next one (if any) if ( pendingRequests[ 0 ] ) { pendingRequests.shift; } else { handlingPendingRequests = false; }					} );				} );				if ( !handlingPendingRequests && pendingRequests[ 0 ] ) { handlingPendingRequests = true; pendingRequests.shift; }				return r.promise; }

/**			 * Utility function for execute *			 * @ignore */			function addLink( media, url ) { var el = document.createElement( 'link' );

el.rel = 'stylesheet'; if ( media && media !== 'all' ) { el.media = media; }				// If you end up here from an IE exception "SCRIPT: Invalid property value.", // see #addEmbeddedCSS, bug 31676, and bug 47277 for details. el.href = url;

$( getMarker ).before( el ); }

/**			 * Executes a loaded module, making it ready to use *			 * @private * @param {string} module Module name to execute */			function execute( module ) { var key, value, media, i, urls, cssHandle, checkCssHandles, runScript, cssHandlesRegistered = false;

if ( !hasOwn.call( registry, module ) ) { throw new Error( 'Module has not been registered yet: ' + module ); }				if ( registry[ module ].state !== 'loaded' ) { throw new Error( 'Module in state "' + registry[ module ].state + '" may not be executed: ' + module ); }

registry[ module ].state = 'executing';

runScript = function { var script, markModuleReady, nestedAddScript, legacyWait, // Expand to include dependencies since we have to exclude both legacy modules // and their dependencies from the legacyWait (to prevent a circular dependency). legacyModules = resolve( mw.config.get( 'wgResourceLoaderLegacyModules', [] ) ); try { script = registry[ module ].script; markModuleReady = function { registry[ module ].state = 'ready'; handlePending( module ); };						nestedAddScript = function ( arr, callback, i ) { // Recursively call queueModuleScript in its own callback // for each element of arr. if ( i >= arr.length ) { // We're at the end of the array callback; return; }

queueModuleScript( arr[ i ], module ).always( function {								nestedAddScript( arr, callback, i + 1 );							} ); };

legacyWait = ( $.inArray( module, legacyModules ) !== -1 ) ? $.Deferred.resolve : mw.loader.using( legacyModules );

legacyWait.always( function {							if ( $.isArray( script ) ) {								nestedAddScript( script, markModuleReady, 0 );							} else if ( $.isFunction( script ) ) {								// Pass jQuery twice so that the signature of the closure which wraps								// the script can bind both '$' and 'jQuery'.								script( $, $, mw.loader.require, registry[ module ].module );								markModuleReady;

} else if ( typeof script === 'string' ) { // Site and user modules are legacy scripts that run in the global scope. // This is transported as a string instead of a function to avoid needing // to use string manipulation to undo the function wrapper. if ( module === 'user' ) { // Implicit dependency on the site module. Not real dependency because // it should run after 'site' regardless of whether it succeeds or fails. mw.loader.using( 'site' ).always( function {										$.globalEval( script );										markModuleReady;									} ); } else { $.globalEval( script ); markModuleReady; }							} else { // Module without script markModuleReady; }						} );					} catch ( e ) {						// This needs to NOT use mw.log because these errors are common in production mode						// and not in debug mode, such as when a symbol that should be global isn't exported						registry[ module ].state = 'error';						mw.track( 'resourceloader.exception', { exception: e, module: module, source: 'module-execute' } );						handlePending( module );					}				};

// Add localizations to message system if ( registry[ module ].messages ) { mw.messages.set( registry[ module ].messages ); }

// Initialise templates if ( registry[ module ].templates ) { mw.templates.set( module, registry[ module ].templates ); }

// Make sure we don't run the scripts until all stylesheet insertions have completed. ( function {					var pending = 0;					checkCssHandles = function  {						// cssHandlesRegistered ensures we don't take off too soon, e.g. when						// one of the cssHandles is fired while we're still creating more handles.						if ( cssHandlesRegistered && pending === 0 && runScript ) {							runScript;							runScript = undefined; // Revoke						}					};					cssHandle = function  {						var check = checkCssHandles;						pending++;						return function  {							if ( check ) {								pending--;								check;								check = undefined; // Revoke							}						};					};				} );

// Process styles (see also mw.loader.implement) // * back-compat: { : css } // * back-compat: { : [url, ..] } // * { "css": [css, ..] } // * { "url": { : [url, ..] } } if ( registry[ module ].style ) { for ( key in registry[ module ].style ) { value = registry[ module ].style[ key ]; media = undefined;

if ( key !== 'url' && key !== 'css' ) { // Backwards compatibility, key is a media-type if ( typeof value === 'string' ) { // back-compat: { : css } // Ignore 'media' because it isn't supported (nor was it used). // Strings are pre-wrapped in "@media". The media-type was just "" // (because it had to be set to something). // This is one of the reasons why this format is no longer used. addEmbeddedCSS( value, cssHandle ); } else { // back-compat: { : [url, ..] } media = key; key = 'bc-url'; }						}

// Array of css strings in key 'css', // or back-compat array of urls from media-type if ( $.isArray( value ) ) { for ( i = 0; i < value.length; i++ ) { if ( key === 'bc-url' ) { // back-compat: { : [url, ..] } addLink( media, value[ i ] ); } else if ( key === 'css' ) { // { "css": [css, ..] } addEmbeddedCSS( value[ i ], cssHandle ); }							}						// Not an array, but a regular object // Array of urls inside media-type key } else if ( typeof value === 'object' ) { // { "url": { : [url, ..] } } for ( media in value ) { urls = value[ media ]; for ( i = 0; i < urls.length; i++ ) { addLink( media, urls[ i ] ); }							}						}					}				}

// Kick off. cssHandlesRegistered = true; checkCssHandles; }

/**			 * Adds all dependencies to the queue with optional callbacks to be run * when the dependencies are ready or fail *			 * @private * @param {string|string[]} dependencies Module name or array of string module names * @param {Function} [ready] Callback to execute when all dependencies are ready * @param {Function} [error] Callback to execute when any dependency fails */			function request( dependencies, ready, error ) { // Allow calling by single module name if ( typeof dependencies === 'string' ) { dependencies = [ dependencies ]; }

// Add ready and error callbacks if they were given if ( ready !== undefined || error !== undefined ) { jobs.push( {						// Narrow down the list to modules that are worth waiting for						dependencies: $.grep( dependencies, function ( module ) { var state = mw.loader.getState( module ); return state === 'registered' || state === 'loaded' || state === 'loading' || state === 'executing'; } ),						ready: ready,						error: error					} ); }

$.each( dependencies, function ( idx, module ) {					var state = mw.loader.getState( module );					// Only queue modules that are still in the initial 'registered' state					// (not ones already loading, ready or error).					if ( state === 'registered' && $.inArray( module, queue ) === -1 ) {						// Private modules must be embedded in the page. Don't bother queuing						// these as the server will deny them anyway (T101806).						if ( registry[ module ].group === 'private' ) {							registry[ module ].state = 'error';							handlePending( module );							return;						}						queue.push( module );					}				} );

mw.loader.work; }

function sortQuery( o ) { var key, sorted = {}, a = [];

for ( key in o ) { if ( hasOwn.call( o, key ) ) { a.push( key ); }				}				a.sort; for ( key = 0; key < a.length; key++ ) { sorted[ a[ key ] ] = o[ a[ key ] ]; }				return sorted; }

/**			 * Converts a module map of the form { foo: [ 'bar', 'baz' ], bar: [ 'baz, 'quux' ] } * to a query string of the form foo.bar,baz|bar.baz,quux *			 * @private */			function buildModulesString( moduleMap ) { var p, prefix, arr = [];

for ( prefix in moduleMap ) { p = prefix === '' ? '' : prefix + '.'; arr.push( p + moduleMap[ prefix ].join( ',' ) ); }				return arr.join( '|' ); }

/**			 * Load modules from load.php *			 * @private * @param {Object} moduleMap Module map, see #buildModulesString * @param {Object} currReqBase Object with other parameters (other than 'modules') to use in the request * @param {string} sourceLoadScript URL of load.php */			function doRequest( moduleMap, currReqBase, sourceLoadScript ) { var request = $.extend(					{ modules: buildModulesString( moduleMap ) },					currReqBase				); request = sortQuery( request ); addScript( sourceLoadScript + '?' + $.param( request ) ); }

/**			 * Resolve indexed dependencies. *			 * ResourceLoader uses an optimization to save space which replaces module names in			 * dependency lists with the index of that module within the array of module * registration data if it exists. The benefit is a significant reduction in the data * size of the startup module. This function changes those dependency lists back to * arrays of strings. *			 * @param {Array} modules Modules array */			function resolveIndexedDependencies( modules ) { $.each( modules, function ( idx, module ) {					if ( module[ 2 ] ) {						module[ 2 ] = $.map( module[ 2 ], function ( dep ) { return typeof dep === 'number' ? modules[ dep ][ 0 ] : dep; } );					}				} );			}

/* Public Members */ return { /**				 * The module registry is exposed as an aid for debugging and inspecting page * state; it is not a public interface for modifying the registry. *				 * @see #registry * @property * @private */				moduleRegistry: registry,

/**				 * @inheritdoc #newStyleTag * @method */				addStyleTag: newStyleTag,

/**				 * Batch-request queued dependencies from the server. */				work: function { var	reqBase, splits, maxQueryLength, q, b, bSource, bGroup, bSourceGroup, source, concatSource, origBatch, group, i, modules, sourceLoadScript, currReqBase, currReqBaseLength, moduleMap, l,						lastDotIndex, prefix, suffix, bytesAdded;

// Build a list of request parameters common to all requests. reqBase = { skin: mw.config.get( 'skin' ), lang: mw.config.get( 'wgUserLanguage' ), debug: mw.config.get( 'debug' ) };					// Split module batch by source and by group. splits = {}; maxQueryLength = mw.config.get( 'wgResourceLoaderMaxQueryLength', 2000 );

// Appends a list of modules from the queue to the batch for ( q = 0; q < queue.length; q++ ) { // Only request modules which are registered if ( hasOwn.call( registry, queue[ q ] ) && registry[ queue[ q ] ].state === 'registered' ) { // Prevent duplicate entries if ( $.inArray( queue[ q ], batch ) === -1 ) { batch.push( queue[ q ] ); // Mark registered modules as loading registry[ queue[ q ] ].state = 'loading'; }						}					}

mw.loader.store.init; if ( mw.loader.store.enabled ) { concatSource = []; origBatch = batch; batch = $.grep( batch, function ( module ) {							var source = mw.loader.store.get( module );							if ( source ) {								concatSource.push( source );								return false;							}							return true;						} ); try { $.globalEval( concatSource.join( ';' ) ); } catch ( err ) { // Not good, the cached mw.loader.implement calls failed! This should // never happen, barring ResourceLoader bugs, browser bugs and PEBKACs. // Depending on how corrupt the string is, it is likely that some // modules' implement succeeded while the ones after the error will // never run and leave their modules in the 'loading' state forever.

// Since this is an error not caused by an individual module but by							// something that infected the implement call itself, don't take any // risks and clear everything in this cache. mw.loader.store.clear; // Re-add the ones still pending back to the batch and let the server // repopulate these modules to the cache. // This means that at most one module will be useless (the one that had							// the error) instead of all of them. mw.track( 'resourceloader.exception', { exception: err, source: 'store-eval' } ); origBatch = $.grep( origBatch, function ( module ) {								return registry[ module ].state === 'loading';							} ); batch = batch.concat( origBatch ); }					}

// Early exit if there's nothing to load... if ( !batch.length ) { return; }

// The queue has been processed into the batch, clear up the queue. queue = [];

// Always order modules alphabetically to help reduce cache // misses for otherwise identical content. batch.sort;

// Split batch by source and by group. for ( b = 0; b < batch.length; b++ ) { bSource = registry[ batch[ b ] ].source; bGroup = registry[ batch[ b ] ].group; if ( !hasOwn.call( splits, bSource ) ) { splits[ bSource ] = {}; }						if ( !hasOwn.call( splits[ bSource ], bGroup ) ) { splits[ bSource ][ bGroup ] = []; }						bSourceGroup = splits[ bSource ][ bGroup ]; bSourceGroup.push( batch[ b ] ); }

// Clear the batch - this MUST happen before we append any // script elements to the body or it's possible that a script // will be locally cached, instantly load, and work the batch // again, all before we've cleared it causing each request to // include modules which are already loaded. batch = [];

for ( source in splits ) {

sourceLoadScript = sources[ source ];

for ( group in splits[ source ] ) {

// Cache access to currently selected list of // modules for this group from this source. modules = splits[ source ][ group ];

currReqBase = $.extend( {								version: getCombinedVersion( modules )							}, reqBase ); // For user modules append a user name to the request. if ( group === 'user' && mw.config.get( 'wgUserName' ) !== null ) { currReqBase.user = mw.config.get( 'wgUserName' ); }							currReqBaseLength = $.param( currReqBase ).length; // We may need to split up the request to honor the query string length limit, // so build it piece by piece. l = currReqBaseLength + 9; // '&modules='.length == 9

moduleMap = {}; // { prefix: [ suffixes ] }

for ( i = 0; i < modules.length; i++ ) { // Determine how many bytes this module would add to the query string lastDotIndex = modules[ i ].lastIndexOf( '.' );

// If lastDotIndex is -1, substr returns an empty string prefix = modules[ i ].substr( 0, lastDotIndex ); suffix = modules[ i ].slice( lastDotIndex + 1 );

bytesAdded = hasOwn.call( moduleMap, prefix ) ? suffix.length + 3 // '%2C'.length == 3 : modules[ i ].length + 3; // '%7C'.length == 3

// If the request would become too long, create a new one, // but don't create empty requests if ( maxQueryLength > 0 && !$.isEmptyObject( moduleMap ) && l + bytesAdded > maxQueryLength ) { // This request would become too long, create a new one // and fire off the old one doRequest( moduleMap, currReqBase, sourceLoadScript ); moduleMap = {}; l = currReqBaseLength + 9; mw.track( 'resourceloader.splitRequest', { maxQueryLength: maxQueryLength } ); }								if ( !hasOwn.call( moduleMap, prefix ) ) { moduleMap[ prefix ] = []; }								moduleMap[ prefix ].push( suffix ); l += bytesAdded; }							// If there's anything left in moduleMap, request that too if ( !$.isEmptyObject( moduleMap ) ) { doRequest( moduleMap, currReqBase, sourceLoadScript ); }						}					}				},

/**				 * Register a source. *				 * The #work method will use this information to split up requests by source. *				 *    mw.loader.addSource( 'mediawikiwiki', '//www.mediawiki.org/w/load.php' ); *				 * @param {string|Object} id Source ID, or object mapping ids to load urls * @param {string} loadUrl Url to a load.php end point * @throws {Error} If source id is already registered */				addSource: function ( id, loadUrl ) { var source; // Allow multiple additions if ( typeof id === 'object' ) { for ( source in id ) { mw.loader.addSource( source, id[ source ] ); }						return; }

if ( hasOwn.call( sources, id ) ) { throw new Error( 'source already registered: ' + id ); }

sources[ id ] = loadUrl; },

/**				 * Register a module, letting the system know about it and its properties. *				 * The startup modules contain calls to this method. *				 * When using multiple module registration by passing an array, dependencies that * are specified as references to modules within the array will be resolved before * the modules are registered. *				 * @param {string|Array} module Module name or array of arrays, each containing * a list of arguments compatible with this method * @param {string|number} version Module version hash (falls backs to empty string) * Can also be a number (timestamp) for compatibility with MediaWiki 1.25 and earlier. * @param {string|Array|Function} dependencies One string or array of strings of module * names on which this module depends, or a function that returns that array. * @param {string} [group=null] Group which the module is in				 * @param {string} [source='local'] Name of the source * @param {string} [skip=null] Script body of the skip function */				register: function ( module, version, dependencies, group, source, skip ) { var i;					// Allow multiple registration if ( typeof module === 'object' ) { resolveIndexedDependencies( module ); for ( i = 0; i < module.length; i++ ) { // module is an array of module names if ( typeof module[ i ] === 'string' ) { mw.loader.register( module[ i ] ); // module is an array of arrays } else if ( typeof module[ i ] === 'object' ) { mw.loader.register.apply( mw.loader, module[ i ] ); }						}						return; }					if ( hasOwn.call( registry, module ) ) { throw new Error( 'module already registered: ' + module ); }					// List the module as registered registry[ module ] = { // Exposed to execute for mw.loader.implement closures. // Import happens via require. module: { exports: {} },						version: version !== undefined ? String( version ) : '', dependencies: [], group: typeof group === 'string' ? group : null, source: typeof source === 'string' ? source : 'local', state: 'registered', skip: typeof skip === 'string' ? skip : null };					if ( typeof dependencies === 'string' ) { // Allow dependencies to be given as a single module name registry[ module ].dependencies = [ dependencies ]; } else if ( typeof dependencies === 'object' || $.isFunction( dependencies ) ) { // Allow dependencies to be given as an array of module names // or a function which returns an array registry[ module ].dependencies = dependencies; }				},

/**				 * Implement a module given the components that make up the module. *				 * When #load or #using requests one or more modules, the server * response contain calls to this function. *				 * @param {string} module Name of module * @param {Function|Array} [script] Function with module code or Array of URLs to * be used as the src attribute of a new ` ` tag. * @param {Object} [style] Should follow one of the following patterns: *				 *    { "css": [css, ..] } *    { "url": { : [url, ..] } } *				 * And for backwards compatibility (needs to be supported forever due to caching): *				 *    { : css } *    { : [url, ..] } *				 * The reason css strings are not concatenated anymore is bug 31676. We now check * whether it's safe to extend the stylesheet. *				 * @param {Object} [messages] List of key/value pairs to be added to mw#messages. * @param {Object} [templates] List of key/value pairs to be added to mw#templates. */				implement: function ( module, script, style, messages, templates ) { // Automatically register module if ( !hasOwn.call( registry, module ) ) { mw.loader.register( module ); }					// Check for duplicate implementation if ( hasOwn.call( registry, module ) && registry[ module ].script !== undefined ) { throw new Error( 'module already implemented: ' + module ); }					// Attach components registry[ module ].script = script || null; registry[ module ].style = style || null; registry[ module ].messages = messages || null; registry[ module ].templates = templates || null; // The module may already have been marked as erroneous if ( $.inArray( registry[ module ].state, [ 'error', 'missing' ] ) === -1 ) { registry[ module ].state = 'loaded'; if ( allReady( registry[ module ].dependencies ) ) { execute( module ); }					}				},

/**				 * Execute a function as soon as one or more required modules are ready. *				 * Example of inline dependency on OOjs: *				 *    mw.loader.using( 'oojs', function  {				 *         OO.compare( [ 1 ], [ 1 ] );				 *     } ); *				 * @param {string|Array} dependencies Module name or array of modules names the * callback depends on to be ready before executing * @param {Function} [ready] Callback to execute when all dependencies are ready * @param {Function} [error] Callback to execute if one or more dependencies failed * @return {jQuery.Promise} * @since 1.23 this returns a promise */				using: function ( dependencies, ready, error ) { var deferred = $.Deferred;

// Allow calling with a single dependency as a string if ( typeof dependencies === 'string' ) { dependencies = [ dependencies ]; }

if ( ready ) { deferred.done( ready ); }					if ( error ) { deferred.fail( error ); }

// Resolve entire dependency map dependencies = resolve( dependencies ); if ( allReady( dependencies ) ) { // Run ready immediately deferred.resolve; } else if ( anyFailed( dependencies ) ) { // Execute error immediately if any dependencies have errors deferred.reject(							new Error( 'One or more dependencies failed to load' ),							dependencies						); } else { // Not all dependencies are ready: queue up a request request( dependencies, deferred.resolve, deferred.reject ); }

return deferred.promise; },

/**				 * Load an external script or one or more modules. *				 * @param {string|Array} modules Either the name of a module, array of modules, * or a URL of an external script or style * @param {string} [type='text/javascript'] MIME type to use if calling with a URL of an				 * external script or style; acceptable values are "text/css" and * "text/javascript"; if no type is provided, text/javascript is assumed. */				load: function ( modules, type ) { var filtered, l;

// Allow calling with a url or single dependency as a string if ( typeof modules === 'string' ) { // "https://example.org/x.js", "http://example.org/x.js", "//example.org/x.js", "/x.js" if ( /^(https?:)?\/?\//.test( modules ) ) { if ( type === 'text/css' ) { // Support: IE 7-8 // Use properties instead of attributes as IE throws security // warnings when inserting a tag with a protocol-relative // URL set though attributes - when on HTTPS. See bug 41331. l = document.createElement( 'link' ); l.rel = 'stylesheet'; l.href = modules; $( 'head' ).append( l ); return; }							if ( type === 'text/javascript' || type === undefined ) { addScript( modules ); return; }							// Unknown type throw new Error( 'invalid type for external url, must be text/css or text/javascript. not ' + type ); }						// Called with single module modules = [ modules ]; }

// Filter out undefined modules, otherwise resolve will throw // an exception for trying to load an undefined module. // Undefined modules are acceptable here in load, because load takes // an array of unrelated modules, whereas the modules passed to // using are related and must all be loaded. filtered = $.grep( modules, function ( module ) {						var state = mw.loader.getState( module );						return state !== null && state !== 'error' && state !== 'missing';					} );

if ( filtered.length === 0 ) { return; }					// Resolve entire dependency map filtered = resolve( filtered ); // If all modules are ready, or if any modules have errors, nothing to be done. if ( allReady( filtered ) || anyFailed( filtered ) ) { return; }					// Since some modules are not yet ready, queue up a request. request( filtered, undefined, undefined ); },

/**				 * Change the state of one or more modules. *				 * @param {string|Object} module Module name or object of module name/state pairs * @param {string} state State name */				state: function ( module, state ) { var m;

if ( typeof module === 'object' ) { for ( m in module ) { mw.loader.state( m, module[ m ] ); }						return; }					if ( !hasOwn.call( registry, module ) ) { mw.loader.register( module ); }					if ( $.inArray( state, [ 'ready', 'error', 'missing' ] ) !== -1						&& registry[ module ].state !== state ) { // Make sure pending modules depending on this one get executed if their // dependencies are now fulfilled! registry[ module ].state = state; handlePending( module ); } else { registry[ module ].state = state; }				},

/**				 * Get the version of a module. *				 * @param {string} module Name of module * @return {string|null} The version, or null if the module (or its version) is not * in the registry. */				getVersion: function ( module ) { if ( !hasOwn.call( registry, module ) || registry[ module ].version === undefined ) { return null; }					return registry[ module ].version; },

/**				 * Get the state of a module. *				 * @param {string} module Name of module * @return {string|null} The state, or null if the module (or its state) is not * in the registry. */				getState: function ( module ) { if ( !hasOwn.call( registry, module ) || registry[ module ].state === undefined ) { return null; }					return registry[ module ].state; },

/**				 * Get the names of all registered modules. *				 * @return {Array} */				getModuleNames: function { return $.map( registry, function ( i, key ) {						return key;					} ); },

/**				 * Get the exported value of a module. *				 * Module provide this value via their local `module.exports`. *				 * @since 1.27 * @return {Array} */				require: function ( moduleName ) { var state = mw.loader.getState( moduleName );

// Only ready modules can be required if ( state !== 'ready' ) { // Module may've forgotten to declare a dependency throw new Error( 'Module "' + moduleName + '" is not loaded.' ); }

return registry[ moduleName ].module.exports; },

/**				 * @inheritdoc mw.inspect#runReports * @method */				inspect: function { var args = slice.call( arguments ); mw.loader.using( 'mediawiki.inspect', function {						mw.inspect.runReports.apply( mw.inspect, args );					} ); },

/**				 * On browsers that implement the localStorage API, the module store serves as a * smart complement to the browser cache. Unlike the browser cache, the module store * can slice a concatenated response from ResourceLoader into its constituent * modules and cache each of them separately, using each module's versioning scheme * to determine when the cache should be invalidated. *				 * @singleton * @class mw.loader.store */				store: { // Whether the store is in use on this page. enabled: null,

MODULE_SIZE_MAX: 100 * 1000,

// The contents of the store, mapping '[module name]@[version]' keys // to module implementations. items: {},

// Cache hit stats stats: { hits: 0, misses: 0, expired: 0 },

/**					 * Construct a JSON-serializable object representing the content of the store. *					 * @return {Object} Module store contents. */					toJSON: function { return { items: mw.loader.store.items, vary: mw.loader.store.getVary }; },

/**					 * Get the localStorage key for the entire module store. The key references * $wgDBname to prevent clashes between wikis which share a common host. *					 * @return {string} localStorage item key */					getStoreKey: function { return 'MediaWikiModuleStore:' + mw.config.get( 'wgDBname' ); },

/**					 * Get a key on which to vary the module cache. *					 * @return {string} String of concatenated vary conditions. */					getVary: function { return [ mw.config.get( 'skin' ), mw.config.get( 'wgResourceLoaderStorageVersion' ), mw.config.get( 'wgUserLanguage' ) ].join( ':' ); },

/**					 * Get a key for a specific module. The key format is '[name]@[version]'. *					 * @param {string} module Module name * @return {string|null} Module key or null if module does not exist */					getModuleKey: function ( module ) { return hasOwn.call( registry, module ) ? ( module + '@' + registry[ module ].version ) : null; },

/**					 * Initialize the store. *					 * Retrieves store from localStorage and (if successfully retrieved) decoding * the stored JSON value to a plain object. *					 * The try / catch block is used for JSON & localStorage feature detection. * See the in-line documentation for Modernizr's localStorage feature detection * code for a full account of why we need a try / catch: * . */					init: function { var raw, data;

if ( mw.loader.store.enabled !== null ) { // Init already ran return; }

if (							// Disabled because localStorage quotas are tight and (in Firefox's case)							// shared by multiple origins.							// See T66721, and .							/Firefox|Opera/.test( navigator.userAgent ) ||

// Disabled by configuration. !mw.config.get( 'wgResourceLoaderStorageEnabled' ) ) {							// Clear any previous store to free up space. (T66721)							mw.loader.store.clear;							mw.loader.store.enabled = false;							return;						}						if ( mw.config.get( 'debug' ) ) {							// Disable module store in debug mode							mw.loader.store.enabled = false;							return;						}

try { raw = localStorage.getItem( mw.loader.store.getStoreKey ); // If we get here, localStorage is available; mark enabled mw.loader.store.enabled = true; data = JSON.parse( raw ); if ( data && typeof data.items === 'object' && data.vary === mw.loader.store.getVary ) { mw.loader.store.items = data.items; return; }						} catch ( e ) { mw.track( 'resourceloader.exception', { exception: e, source: 'store-localstorage-init' } ); }

if ( raw === undefined ) { // localStorage failed; disable store mw.loader.store.enabled = false; } else { mw.loader.store.update; }					},

/**					 * Retrieve a module from the store and update cache hit stats. *					 * @param {string} module Module name * @return {string|boolean} Module implementation or false if unavailable */					get: function ( module ) { var key;

if ( !mw.loader.store.enabled ) { return false; }

key = mw.loader.store.getModuleKey( module ); if ( key in mw.loader.store.items ) { mw.loader.store.stats.hits++; return mw.loader.store.items[ key ]; }						mw.loader.store.stats.misses++; return false; },

/**					 * Stringify a module and queue it for storage. *					 * @param {string} module Module name * @param {Object} descriptor The module's descriptor as set in the registry */					set: function ( module, descriptor ) { var args, key, src;

if ( !mw.loader.store.enabled ) { return false; }

key = mw.loader.store.getModuleKey( module );

if (							// Already stored a copy of this exact version							key in mw.loader.store.items ||							// Module failed to load							descriptor.state !== 'ready' ||							// Unversioned, private, or site-/user-specific							( !descriptor.version || $.inArray( descriptor.group, [ 'private', 'user' ] ) !== -1 ) ||							// Partial descriptor							$.inArray( undefined, [ descriptor.script, descriptor.style, descriptor.messages, descriptor.templates ] ) !== -1						) { // Decline to store return false; }

try { args = [ JSON.stringify( module ), typeof descriptor.script === 'function' ? String( descriptor.script ) : JSON.stringify( descriptor.script ), JSON.stringify( descriptor.style ), JSON.stringify( descriptor.messages ), JSON.stringify( descriptor.templates ) ];							// Attempted workaround for a possible Opera bug (bug T59567). // This regex should never match under sane conditions. if ( /^\s*\(/.test( args[ 1 ] ) ) {								args[ 1 ] = 'function' + args[ 1 ];								mw.track( 'resourceloader.assert', { source: 'bug-T59567' } );							}						} catch ( e ) {							mw.track( 'resourceloader.exception', { exception: e, source: 'store-localstorage-json' } );							return;						}

src = 'mw.loader.implement(' + args.join( ',' ) + ');'; if ( src.length > mw.loader.store.MODULE_SIZE_MAX ) { return false; }						mw.loader.store.items[ key ] = src; mw.loader.store.update; },

/**					 * Iterate through the module store, removing any item that does not correspond * (in name and version) to an item in the module registry. */					prune: function { var key, module;

if ( !mw.loader.store.enabled ) { return false; }

for ( key in mw.loader.store.items ) { module = key.slice( 0, key.indexOf( '@' ) ); if ( mw.loader.store.getModuleKey( module ) !== key ) { mw.loader.store.stats.expired++; delete mw.loader.store.items[ key ]; } else if ( mw.loader.store.items[ key ].length > mw.loader.store.MODULE_SIZE_MAX ) { // This value predates the enforcement of a size limit on cached modules. delete mw.loader.store.items[ key ]; }						}					},

/**					 * Clear the entire module store right now. */					clear: function { mw.loader.store.items = {}; try { localStorage.removeItem( mw.loader.store.getStoreKey ); } catch ( ignored ) {} },

/**					 * Sync in-memory store back to localStorage. *					 * This function debounces updates. When called with a flush already pending, * the call is coalesced into the pending update. The call to * localStorage.setItem will be naturally deferred until the page is quiescent. *					 * Because localStorage is shared by all pages from the same origin, if multiple * pages are loaded with different module sets, the possibility exists that * modules saved by one page will be clobbered by another. But the impact would * be minor and the problem would be corrected by subsequent page views. *					 * @method */					update: ( function {						var hasPendingWrite = false;

function flushWrites { var data, key; if ( !hasPendingWrite || !mw.loader.store.enabled ) { return; }

mw.loader.store.prune; key = mw.loader.store.getStoreKey; try { // Replacing the content of the module store might fail if the new // contents would exceed the browser's localStorage size limit. To								// avoid clogging the browser with stale data, always remove the old // value before attempting to set the new one. localStorage.removeItem( key ); data = JSON.stringify( mw.loader.store ); localStorage.setItem( key, data ); } catch ( e ) { mw.track( 'resourceloader.exception', { exception: e, source: 'store-localstorage-update' } ); }

hasPendingWrite = false; }

return function { if ( !hasPendingWrite ) { hasPendingWrite = true; mw.requestIdleCallback( flushWrites ); }						};					} )				}			};		} ),

/**		 * HTML construction helper functions *		 *    @example *		 *    var Html, output; *		 *    Html = mw.html; *    output = Html.element( 'div', {}, new Html.Raw( *        Html.element( 'img', { src: '<' } ) *    ) );		 *     mw.log( output ); //  *		 * @class mw.html * @singleton */		html: ( function {			function escapeCallback( s ) {				switch ( s ) {					case '\'':						return '&#039;';					case '"':						return '&quot;';					case '<':						return '&lt;';					case '>':						return '&gt;';					case '&':						return '&amp;';				}			}

return { /**				 * Escape a string for HTML. *				 * Converts special characters to HTML entities. *				 *    mw.html.escape( '< > \' & "' );				 *     // Returns &lt; &gt; &#039; &amp; &quot;				 *				 * @param {string} s The string to escape				 * @return {string} HTML				 */				escape: function ( s ) {					return s.replace( /['"<>&]/g, escapeCallback ); },

/**				 * Create an HTML element string, with safe escaping. *				 * @param {string} name The tag name. * @param {Object} [attrs] An object with members mapping element names to values * @param {string|mw.html.Raw|mw.html.Cdata|null} [contents=null] The contents of the element. *				 * - string: Text to be escaped. * - null: The element is treated as void with short closing form, e.g. ` `. * - this.Raw: The raw value is directly included. * - this.Cdata: The raw value is directly included. An exception is *   thrown if it contains any illegal ETAGO delimiter. *   See . * @return {string} HTML */				element: function ( name, attrs, contents ) { var v, attrName, s = '<' + name;

if ( attrs ) { for ( attrName in attrs ) { v = attrs[ attrName ]; // Convert name=true, to name=name if ( v === true ) { v = attrName; // Skip name=false } else if ( v === false ) { continue; }							s += ' ' + attrName + '="' + this.escape( String( v ) ) + '"'; }					}					if ( contents === undefined || contents === null ) { // Self close tag s += '/>'; return s;					} // Regular open tag s += '>'; switch ( typeof contents ) { case 'string': // Escaped s += this.escape( contents ); break; case 'number': case 'boolean': // Convert to string s += String( contents ); break; default: if ( contents instanceof this.Raw ) { // Raw HTML inclusion s += contents.value; } else if ( contents instanceof this.Cdata ) { // CDATA if ( /<\/[a-zA-z]/.test( contents.value ) ) { throw new Error( 'mw.html.element: Illegal end tag found in CDATA' ); }								s += contents.value; } else { throw new Error( 'mw.html.element: Invalid type of contents' ); }					}					s += ''; return s;				},

/**				 * Wrapper object for raw HTML passed to mw.html.element. *				 * @class mw.html.Raw */				Raw: function ( value ) { this.value = value; },

/**				 * Wrapper object for CDATA element contents passed to mw.html.element *				 * @class mw.html.Cdata */				Cdata: function ( value ) { this.value = value; }			};		} ),

// Skeleton user object, extended by the 'mediawiki.user' module. /**		 * @class mw.user * @singleton */		user: { /**			 * @property {mw.Map} */			options: new Map, /**			 * @property {mw.Map} */			tokens: new Map },

// OOUI widgets specific to MediaWiki widgets: {},

/**		 * Registry and firing of events. *		 * MediaWiki has various interface components that are extended, enhanced * or manipulated in some other way by extensions, gadgets and even * in core itself. *		 * This framework helps streamlining the timing of when these other * code paths fire their plugins (instead of using document-ready,		 * which can and should be limited to firing only once). *		 * Features like navigating to other wiki pages, previewing an edit * and editing itself – without a refresh – can then retrigger these * hooks accordingly to ensure everything still works as expected. *		 * Example usage: *		 *    mw.hook( 'wikipage.content' ).add( fn ).remove( fn ); *    mw.hook( 'wikipage.content' ).fire( $content ); *		 * Handlers can be added and fired for arbitrary event names at any time. The same * event can be fired multiple times. The last run of an event is memorized * (similar to `$(document).ready` and `$.Deferred.done`). * This means if an event is fired, and a handler added afterwards, the added * function will be fired right away with the last given event data. *		 * Like Deferreds and Promises, the mw.hook object is both detachable and chainable. * Thus allowing flexible use and optimal maintainability and authority control. * You can pass around the `add` and/or `fire` method to another piece of code * without it having to know the event name (or `mw.hook` for that matter). *		 *    var h = mw.hook( 'bar.ready' ); *    new mw.Foo( .. ).fetch( { callback: h.fire } ); *		 * Note: Events are documented with an underscore instead of a dot in the event * name due to jsduck not supporting dots in that position. *		 * @class mw.hook */		hook: ( function {			var lists = {};

/**			 * Create an instance of mw.hook. *			 * @method hook * @member mw * @param {string} name Name of hook. * @return {mw.hook} */			return function ( name ) { var list = hasOwn.call( lists, name ) ? lists[ name ] : lists[ name ] = $.Callbacks( 'memory' );

return { /**					 * Register a hook handler *					 * @param {...Function} handler Function to bind. * @chainable */					add: list.add,

/**					 * Unregister a hook handler *					 * @param {...Function} handler Function to unbind. * @chainable */					remove: list.remove,

/**					 * Run a hook. *					 * @param {...Mixed} data * @chainable */					fire: function { return list.fireWith.call( this, null, slice.call( arguments ) ); }				};			};		} )	};

// Alias $j to jQuery for backwards compatibility // @deprecated since 1.23 Use $ or jQuery instead mw.log.deprecate( window, '$j', $, 'Use $ or jQuery instead.' );

/**	 * Log a message to window.console, if possible. *	 * Useful to force logging of some errors that are otherwise hard to detect (i.e., this logs	 * also in production mode). Gets console references in each invocation instead of caching the * reference, so that debugging tools loaded later are supported (e.g. Firebug Lite in IE). *	 * @private * @method log_ * @param {string} topic Stream name passed by mw.track * @param {Object} data Data passed by mw.track * @param {Error} [data.exception] * @param {string} data.source Error source * @param {string} [data.module] Name of module which caused the error */	function log( topic, data ) { var msg, e = data.exception, source = data.source, module = data.module, console = window.console;

if ( console && console.log ) { msg = ( e ? 'Exception' : 'Error' ) + ' in ' + source; if ( module ) { msg += ' in module ' + module; }			msg += ( e ? ':' : '.' ); console.log( msg );

// If we have an exception object, log it to the error channel to trigger // proper stacktraces in browsers that support it. No fallback as we have // no browsers that don't support error, but do support log. if ( e && console.error ) { console.error( String( e ), e ); }		}	}

// Subscribe to error streams mw.trackSubscribe( 'resourceloader.exception', log ); mw.trackSubscribe( 'resourceloader.assert', log );

/**	 * Fired when all modules associated with the page have finished loading. *	 * @event resourceloader_loadEnd * @member mw.hook */	$( function {		var loading = $.grep( mw.loader.getModuleNames, function ( module ) { return mw.loader.getState( module ) === 'loading'; } );		// In order to use jQuery.when (which stops early if one of the promises got rejected)		// cast any loading failures into successes. We only need a callback, not the module.		loading = $.map( loading, function ( module ) { return mw.loader.using( module ).then( null, function {				return $.Deferred.resolve;			} ); } );		$.when.apply( $, loading ).then( function { mwPerformance.mark( 'mwLoadEnd' ); mw.hook( 'resourceloader.loadEnd' ).fire; } );	} );

// Attach to window and globally alias window.mw = window.mediaWiki = mw; }( jQuery ) ); //