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+/**
+ * Base library for MediaWiki.
+ *
+ * Exposed globally as `mediaWiki` with `mw` as shortcut.
+ *
+ * @class mw
+ * @alternateClassName mediaWiki
+ * @singleton
+ */
+
+/* global mwNow */
+/* eslint-disable no-use-before-define */
+
+( function ( $ ) {
+ 'use strict';
+
+ var mw, StringSet, log,
+ 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 <https://en.wikipedia.org/wiki/FNV_hash_function>
+ *
+ * @private
+ * @param {string} str String to hash
+ * @return {string} hash as an seven-character base 36 string
+ */
+ function fnv132( str ) {
+ /* eslint-disable no-bitwise */
+ 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;
+ /* eslint-enable no-bitwise */
+ }
+
+ function defineFallbacks() {
+ // <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set>
+ StringSet = window.Set || ( function () {
+ /**
+ * @private
+ * @class
+ */
+ function StringSet() {
+ this.set = {};
+ }
+ StringSet.prototype.add = function ( value ) {
+ this.set[ value ] = true;
+ };
+ StringSet.prototype.has = function ( value ) {
+ return hasOwn.call( this.set, value );
+ };
+ return StringSet;
+ }() );
+ }
+
+ /**
+ * Create an object that can be read from or written to via methods that allow
+ * interaction both with single and multiple properties at once.
+ *
+ * @private
+ * @class mw.Map
+ *
+ * @constructor
+ * @param {boolean} [global=false] Whether to synchronise =values to the global
+ * window object (for backwards-compatibility with mw.config; T72470). Values are
+ * copied in one direction only. Changes to globals do not reflect in the map.
+ */
+ function Map( global ) {
+ this.values = {};
+ if ( global === true ) {
+ // 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;
+ };
+ }
+ }
+
+ /**
+ * 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;
+ log.deprecate(
+ window,
+ key,
+ value,
+ // Deprecation notice for mw.config globals (T58550, T72470)
+ map === mw.config && 'Use mw.config instead.'
+ );
+ }
+
+ Map.prototype = {
+ constructor: Map,
+
+ /**
+ * 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, a new object with all key/values is returned.
+ */
+ get: function ( selection, fallback ) {
+ var results, i;
+ fallback = arguments.length > 1 ? fallback : null;
+
+ if ( Array.isArray( selection ) ) {
+ results = {};
+ for ( i = 0; i < selection.length; i++ ) {
+ if ( typeof selection[ i ] === 'string' ) {
+ results[ selection[ i ] ] = hasOwn.call( this.values, selection[ i ] ) ?
+ this.values[ selection[ i ] ] :
+ fallback;
+ }
+ }
+ return results;
+ }
+
+ if ( typeof selection === 'string' ) {
+ return hasOwn.call( this.values, selection ) ?
+ this.values[ selection ] :
+ fallback;
+ }
+
+ if ( selection === undefined ) {
+ results = {};
+ for ( i in this.values ) {
+ results[ i ] = this.values[ i ];
+ }
+ return results;
+ }
+
+ // Invalid selection key
+ return fallback;
+ },
+
+ /**
+ * 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 i;
+ if ( Array.isArray( selection ) ) {
+ for ( i = 0; i < selection.length; i++ ) {
+ if ( typeof selection[ i ] !== 'string' || !hasOwn.call( this.values, selection[ i ] ) ) {
+ 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 $N replacements and nothing else.
+ * This may be overridden to provide a more complex message parser.
+ * The primary override is in the mediawiki.jqueryMsg module.
+ *
+ * This function will not be called for nonexistent messages.
+ *
+ * @return {string} Parsed message
+ */
+ parser: function () {
+ return mw.format.apply( null, [ this.map.get( this.key ) ].concat( this.parameters ) );
+ },
+
+ // eslint-disable-next-line valid-jsdoc
+ /**
+ * Add (does not replace) parameters for `$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 `<key>` if key
+ * does not exist.
+ */
+ toString: function () {
+ var text;
+
+ if ( !this.exists() ) {
+ // Use ⧼key⧽ as text if key does not exist
+ // Err on the side of safety, ensure that the output
+ // is always html safe in the event the message key is
+ // missing, since in that case its highly likely the
+ // message key is user-controlled.
+ // '⧼' is used instead of '<' to side-step any
+ // double-escaping issues.
+ // (Keep synchronised with Message::toString() in PHP.)
+ return '⧼' + mw.html.escape( 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 );
+ }
+ };
+
+ defineFallbacks();
+
+ /* eslint-disable no-console */
+ log = ( function () {
+ /**
+ * Write a verbose message to the browser's console in debug mode.
+ *
+ * This method is mainly intended for verbose logging. It is a no-op in production mode.
+ * In ResourceLoader debug mode, it will use the browser's console if available, with
+ * fallback to creating a console interface in the DOM and logging messages there.
+ *
+ * See {@link mw.log} for other logging methods.
+ *
+ * @member mw
+ * @param {...string} msg Messages to output to console.
+ */
+ var log = function () {},
+ console = window.console;
+
+ // Note: Keep list of methods in sync with restoration in mediawiki.log.js
+ // when adding or removing mw.log methods below!
+
+ /**
+ * Collection of methods to help log messages to the console.
+ *
+ * @class mw.log
+ * @singleton
+ */
+
+ /**
+ * Write a message to the browser console's warning channel.
+ *
+ * This method is a no-op in browsers that don't implement the Console API.
+ *
+ * @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 browser console's error channel.
+ *
+ * Most browsers also print a stacktrace when calling this method if the
+ * argument is an Error object.
+ *
+ * This method is a no-op in browsers that don't implement the Console API.
+ *
+ * @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 on a host object that, when accessed, will produce
+ * a deprecation warning in the console.
+ *
+ * @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
+ * @param {string} [logName=key] Optional custom name for the feature.
+ * This is used instead of `key` in the message and `mw.deprecate` tracking.
+ */
+ log.deprecate = !Object.defineProperty ? function ( obj, key, val ) {
+ obj[ key ] = val;
+ } : function ( obj, key, val, msg, logName ) {
+ var logged = new StringSet();
+ logName = logName || key;
+ msg = 'Use of "' + logName + '" is deprecated.' + ( msg ? ( ' ' + msg ) : '' );
+ function uniqueTrace() {
+ var trace = new Error().stack;
+ if ( logged.has( trace ) ) {
+ return false;
+ }
+ logged.add( trace );
+ return true;
+ }
+ // Support: Safari 5.0
+ // Throws "not supported on DOM Objects" for Node or Element objects (incl. document)
+ // Safari 4.0 doesn't have this method, and it was fixed in Safari 5.1.
+ try {
+ Object.defineProperty( obj, key, {
+ configurable: true,
+ enumerable: true,
+ get: function () {
+ if ( uniqueTrace() ) {
+ mw.track( 'mw.deprecate', logName );
+ mw.log.warn( msg );
+ }
+ return val;
+ },
+ set: function ( newVal ) {
+ if ( uniqueTrace() ) {
+ mw.track( 'mw.deprecate', logName );
+ mw.log.warn( msg );
+ }
+ val = newVal;
+ }
+ } );
+ } catch ( err ) {
+ obj[ key ] = val;
+ }
+ };
+
+ return log;
+ }() );
+ /* eslint-enable no-console */
+
+ /**
+ * @class mw
+ */
+ mw = {
+ redefineFallbacksForTest: function () {
+ if ( !window.QUnit ) {
+ throw new Error( 'Reset not allowed outside unit tests' );
+ }
+ defineFallbacks();
+ },
+
+ /**
+ * 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: mwNow,
+ // mwNow is defined in startup.js
+
+ /**
+ * 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 = trackHandlers.filter( 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();
+ },
+
+ // Expose mw.log
+ log: 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
+ * <https://www.mediawiki.org/wiki/ResourceLoader/Features>
+ *
+ * @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
+ * - resolve: failed to sort dependencies for a module in mw.loader.load
+ * - 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 <https://phabricator.wikimedia.org/T59567> 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 required.
+ * Meta data is registered via mw.loader#register. Calls to that method are
+ * generated server-side by the startup module.
+ * - `loading`:
+ * The module was required through mw.loader (either directly or as dependency of
+ * another module). The client will fetch module contents from the server.
+ * The contents are then stashed in the registry via mw.loader#implement.
+ * - `loaded`:
+ * The module has been loaded from the server and stashed via mw.loader#implement.
+ * If the module has no more dependencies in-flight, the module will be executed
+ * immediately. 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 = {},
+
+ // For queueModuleScript()
+ handlingPendingRequests = false,
+ pendingRequests = [],
+
+ // List of modules to be loaded
+ queue = [],
+
+ /**
+ * List of callback jobs waiting for modules to be ready.
+ *
+ * Jobs are created by #enqueue() and run by #handlePending().
+ *
+ * Typically when a job is created for a module, the job's dependencies contain
+ * both the required module 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(),
+ rAF = window.requestAnimationFrame || setTimeout;
+
+ function getMarker() {
+ if ( !marker ) {
+ // Cache
+ marker = document.querySelector( 'meta[name="ResourceLoaderDynamicStyles"]' );
+ if ( !marker ) {
+ mw.log( 'Created ResourceLoaderDynamicStyles marker dynamically' );
+ marker = document.createElement( 'meta' );
+ marker.name = 'ResourceLoaderDynamicStyles';
+ document.head.appendChild( marker );
+ }
+ }
+ 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.head.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 `<style>` tag
+ * or create a new one based on whether the given `cssText` is safe for extension.
+ *
+ * @private
+ * @param {string} [cssText=cssBuffer] If called without cssText,
+ * the internal buffer will be inserted instead.
+ * @param {Function} [callback]
+ */
+ function addEmbeddedCSS( cssText, callback ) {
+ 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 <style> 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;
+ if ( !cssBufferTimer ) {
+ cssBufferTimer = rAF( function () {
+ // Wrap in anonymous function that takes no arguments
+ // 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 = '';
+ }
+
+ $( newStyleTag( cssText, getMarker() ) );
+
+ fireCallbacks();
+ }
+
+ /**
+ * @private
+ * @param {Array} modules List of module names
+ * @return {string} Hash of concatenated version hashes.
+ */
+ function getCombinedVersion( modules ) {
+ var hashes = modules.map( 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 ( typeof job.error === 'function' ) {
+ job.error( new Error( 'Module ' + module + ' has failed dependencies' ), [ module ] );
+ }
+ } else {
+ if ( typeof job.ready === 'function' ) {
+ 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 {StringSet} [unresolved] Used to track the current dependency
+ * chain, and 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 ) {
+ // eslint-disable-next-line no-new-func
+ 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 ( typeof registry[ module ].dependencies === 'function' ) {
+ 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 ( resolved.indexOf( module ) !== -1 ) {
+ // Module already resolved; nothing to do
+ return;
+ }
+ // Create unresolved if not passed in
+ if ( !unresolved ) {
+ unresolved = new StringSet();
+ }
+ // Tracks down dependencies
+ deps = registry[ module ].dependencies;
+ for ( i = 0; i < deps.length; i++ ) {
+ if ( resolved.indexOf( deps[ i ] ) === -1 ) {
+ if ( unresolved.has( deps[ i ] ) ) {
+ throw new Error( mw.format(
+ 'Circular reference detected: $1 -> $2',
+ module,
+ deps[ i ]
+ ) );
+ }
+
+ unresolved.add( module );
+ 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'.
+ * @throws {Error} If an unregistered module or a dependency loop is encountered
+ */
+ function resolve( modules ) {
+ var i, resolved = [];
+ for ( i = 0; i < modules.length; i++ ) {
+ sortDependencies( modules[ i ], resolved );
+ }
+ return resolved;
+ }
+
+ /**
+ * Like #resolve(), except it will silently ignore modules that
+ * are missing or have missing dependencies.
+ *
+ * @private
+ * @param {string[]} modules Array of string module names
+ * @return {Array} List of dependencies.
+ */
+ function resolveStubbornly( modules ) {
+ var i, saved, resolved = [];
+ for ( i = 0; i < modules.length; i++ ) {
+ saved = resolved.slice();
+ try {
+ sortDependencies( modules[ i ], resolved );
+ } catch ( err ) {
+ // This module is unknown or has unknown dependencies.
+ // Undo any incomplete resolutions made and keep going.
+ resolved = saved;
+ mw.track( 'resourceloader.exception', {
+ exception: err,
+ source: 'resolve'
+ } );
+ }
+ }
+ 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 <script>, 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 retrieve
+ // 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 ) ) {
+ // Emulate runScript() part of execute()
+ window.require = mw.loader.require;
+ window.module = registry[ moduleName ].module;
+ }
+ addScript( src ).always( function () {
+ // 'module.exports' should not persist after the file is executed to
+ // avoid leakage to unrelated code. 'require' should be kept, however,
+ // as asynchronous access to 'require' is allowed and expected. (T144879)
+ 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
+ * @param {string} [media] Media attribute
+ * @param {string} url URL
+ */
+ 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, T33676, T43331, and T49277 for details.
+ el.href = url;
+
+ $( getMarker() ).before( el );
+ }
+
+ /**
+ * Executes a loaded module, making it ready to use
+ *
+ * @private
+ * @param {string} module Module name to execute
+ */
+ function execute( module ) {
+ var key, value, media, i, urls, cssHandle, checkCssHandles, runScript,
+ cssHandlesRegistered = false;
+
+ if ( !hasOwn.call( registry, module ) ) {
+ throw new Error( 'Module has not been registered yet: ' + module );
+ }
+ if ( registry[ module ].state !== 'loaded' ) {
+ throw new Error( 'Module in state "' + registry[ module ].state + '" may not be executed: ' + module );
+ }
+
+ registry[ module ].state = 'executing';
+
+ runScript = function () {
+ var script, markModuleReady, nestedAddScript;
+
+ script = registry[ module ].script;
+ markModuleReady = function () {
+ registry[ module ].state = 'ready';
+ handlePending( module );
+ };
+ nestedAddScript = function ( arr, callback, i ) {
+ // Recursively call queueModuleScript() in its own callback
+ // for each element of arr.
+ if ( i >= arr.length ) {
+ // We're at the end of the array
+ callback();
+ return;
+ }
+
+ queueModuleScript( arr[ i ], module ).always( function () {
+ nestedAddScript( arr, callback, i + 1 );
+ } );
+ };
+
+ try {
+ if ( Array.isArray( script ) ) {
+ nestedAddScript( script, markModuleReady, 0 );
+ } else if ( typeof script === 'function' ) {
+ // Pass jQuery twice so that the signature of the closure which wraps
+ // the script can bind both '$' 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.
+ $.globalEval( script );
+ markModuleReady();
+
+ } else {
+ // Module without script
+ markModuleReady();
+ }
+ } catch ( e ) {
+ // Use mw.track instead of mw.log because these errors are common in production mode
+ // (e.g. undefined variable), and mw.log is only enabled in debug mode.
+ 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 ) {
+ 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( runScript );
+ } else {
+ 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: { <media>: css }
+ // * back-compat: { <media>: [url, ..] }
+ // * { "css": [css, ..] }
+ // * { "url": { <media>: [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: { <media>: 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: { <media>: [url, ..] }
+ media = key;
+ key = 'bc-url';
+ }
+ }
+
+ // Array of css strings in key 'css',
+ // or back-compat array of urls from media-type
+ if ( Array.isArray( value ) ) {
+ for ( i = 0; i < value.length; i++ ) {
+ if ( key === 'bc-url' ) {
+ // back-compat: { <media>: [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": { <media>: [url, ..] } }
+ for ( media in value ) {
+ urls = value[ media ];
+ for ( i = 0; i < urls.length; i++ ) {
+ addLink( media, urls[ i ] );
+ }
+ }
+ }
+ }
+ }
+
+ // Kick off.
+ cssHandlesRegistered = true;
+ checkCssHandles();
+ }
+
+ /**
+ * Add one or more modules to the module load queue.
+ *
+ * See also #work().
+ *
+ * @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 enqueue( 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: dependencies.filter( function ( module ) {
+ var state = mw.loader.getState( module );
+ return state === 'registered' || state === 'loaded' || state === 'loading' || state === 'executing';
+ } ),
+ ready: ready,
+ error: error
+ } );
+ }
+
+ dependencies.forEach( function ( 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' && queue.indexOf( module ) === -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 ) {
+ 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`.
+ *
+ * See `ResourceLoader::makePackedModulesString()` in PHP, of which this is a port.
+ * On the server, unpacking is done by `ResourceLoaderContext::expandModuleNames()`.
+ *
+ * Note: This is only half of the logic, the other half has to be in #batchRequest(),
+ * because its implementation needs to keep track of potential string size in order
+ * to decide when to split the requests due to url size.
+ *
+ * @private
+ * @param {Object} moduleMap Module map
+ * @return {Object}
+ * @return {string} return.str Module query string
+ * @return {Array} return.list List of module names in matching order
+ */
+ function buildModulesString( moduleMap ) {
+ var p, prefix,
+ str = [],
+ list = [];
+
+ function restore( suffix ) {
+ return p + suffix;
+ }
+
+ for ( prefix in moduleMap ) {
+ p = prefix === '' ? '' : prefix + '.';
+ str.push( p + moduleMap[ prefix ].join( ',' ) );
+ list.push.apply( list, moduleMap[ prefix ].map( restore ) );
+ }
+ return {
+ str: str.join( '|' ),
+ list: list
+ };
+ }
+
+ /**
+ * 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.
+ *
+ * @private
+ * @param {Array} modules Modules array
+ */
+ function resolveIndexedDependencies( modules ) {
+ var i, j, deps;
+ function resolveIndex( dep ) {
+ return typeof dep === 'number' ? modules[ dep ][ 0 ] : dep;
+ }
+ for ( i = 0; i < modules.length; i++ ) {
+ deps = modules[ i ][ 2 ];
+ if ( deps ) {
+ for ( j = 0; j < deps.length; j++ ) {
+ deps[ j ] = resolveIndex( deps[ j ] );
+ }
+ }
+ }
+ }
+
+ /**
+ * Create network requests for a batch of modules.
+ *
+ * This is an internal method for #work(). This must not be called directly
+ * unless the modules are already registered, and no request is in progress,
+ * and the module state has already been set to `loading`.
+ *
+ * @private
+ * @param {string[]} batch
+ */
+ function batchRequest( batch ) {
+ var reqBase, splits, maxQueryLength, b, bSource, bGroup, bSourceGroup,
+ source, group, i, modules, sourceLoadScript,
+ currReqBase, currReqBaseLength, moduleMap, currReqModules, l,
+ lastDotIndex, prefix, suffix, bytesAdded;
+
+ /**
+ * Start the currently drafted request to the server.
+ *
+ * @ignore
+ */
+ function doRequest() {
+ // Optimisation: Inherit (Object.create), not copy ($.extend)
+ var query = Object.create( currReqBase ),
+ packed = buildModulesString( moduleMap );
+ query.modules = packed.str;
+ // The packing logic can change the effective order, even if the input was
+ // sorted. As such, the call to getCombinedVersion() must use this
+ // effective order, instead of currReqModules, as otherwise the combined
+ // version will not match the hash expected by the server based on
+ // combining versions from the module query string in-order. (T188076)
+ query.version = getCombinedVersion( packed.list );
+ query = sortQuery( query );
+ addScript( sourceLoadScript + '?' + $.param( query ) );
+ }
+
+ if ( !batch.length ) {
+ return;
+ }
+
+ // Always order modules alphabetically to help reduce cache
+ // misses for otherwise identical content.
+ batch.sort();
+
+ // Query parameters common to all requests
+ reqBase = {
+ skin: mw.config.get( 'skin' ),
+ lang: mw.config.get( 'wgUserLanguage' ),
+ debug: mw.config.get( 'debug' )
+ };
+ maxQueryLength = mw.config.get( 'wgResourceLoaderMaxQueryLength', 2000 );
+
+ // Split module list by source and by group.
+ splits = {};
+ for ( b = 0; b < batch.length; b++ ) {
+ bSource = registry[ batch[ b ] ].source;
+ bGroup = registry[ batch[ b ] ].group;
+ if ( !hasOwn.call( splits, bSource ) ) {
+ splits[ bSource ] = {};
+ }
+ if ( !hasOwn.call( splits[ bSource ], bGroup ) ) {
+ splits[ bSource ][ bGroup ] = [];
+ }
+ bSourceGroup = splits[ bSource ][ bGroup ];
+ bSourceGroup.push( batch[ b ] );
+ }
+
+ for ( source in splits ) {
+
+ sourceLoadScript = sources[ source ];
+
+ for ( group in splits[ source ] ) {
+
+ // Cache access to currently selected list of
+ // modules for this group from this source.
+ modules = splits[ source ][ group ];
+
+ // Query parameters common to requests for this module group
+ // Optimisation: Inherit (Object.create), not copy ($.extend)
+ currReqBase = Object.create( reqBase );
+ // User modules require a user name in the query string.
+ if ( group === 'user' && mw.config.get( 'wgUserName' ) !== null ) {
+ currReqBase.user = mw.config.get( 'wgUserName' );
+ }
+
+ // In addition to currReqBase, doRequest() will also add 'modules' and 'version'.
+ // > '&modules='.length === 9
+ // > '&version=1234567'.length === 16
+ // > 9 + 16 = 25
+ currReqBaseLength = $.param( currReqBase ).length + 25;
+
+ // We may need to split up the request to honor the query string length limit,
+ // so build it piece by piece.
+ l = currReqBaseLength;
+ moduleMap = {}; // { prefix: [ suffixes ] }
+ currReqModules = [];
+
+ 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 url would become too long, create a new one, but don't create empty requests
+ if ( maxQueryLength > 0 && currReqModules.length && l + bytesAdded > maxQueryLength ) {
+ // Dispatch what we've got...
+ doRequest();
+ // .. and start again.
+ l = currReqBaseLength;
+ moduleMap = {};
+ currReqModules = [];
+
+ mw.track( 'resourceloader.splitRequest', { maxQueryLength: maxQueryLength } );
+ }
+ if ( !hasOwn.call( moduleMap, prefix ) ) {
+ moduleMap[ prefix ] = [];
+ }
+ l += bytesAdded;
+ moduleMap[ prefix ].push( suffix );
+ currReqModules.push( modules[ i ] );
+ }
+ // If there's anything left in moduleMap, request that too
+ if ( currReqModules.length ) {
+ doRequest();
+ }
+ }
+ }
+ }
+
+ /**
+ * @private
+ * @param {string[]} implementations Array containing pieces of JavaScript code in the
+ * form of calls to mw.loader#implement().
+ * @param {Function} cb Callback in case of failure
+ * @param {Error} cb.err
+ */
+ function asyncEval( implementations, cb ) {
+ if ( !implementations.length ) {
+ return;
+ }
+ mw.requestIdleCallback( function () {
+ try {
+ $.globalEval( implementations.join( ';' ) );
+ } catch ( err ) {
+ cb( err );
+ }
+ } );
+ }
+
+ /**
+ * Make a versioned key for a specific module.
+ *
+ * @private
+ * @param {string} module Module name
+ * @return {string|null} Module key in format '`[name]@[version]`',
+ * or null if the module does not exist
+ */
+ function getModuleKey( module ) {
+ return hasOwn.call( registry, module ) ?
+ ( module + '@' + registry[ module ].version ) : null;
+ }
+
+ /**
+ * @private
+ * @param {string} key Module name or '`[name]@[version]`'
+ * @return {Object}
+ */
+ function splitModuleKey( key ) {
+ var index = key.indexOf( '@' );
+ if ( index === -1 ) {
+ return {
+ name: key,
+ version: ''
+ };
+ }
+ return {
+ name: key.slice( 0, index ),
+ version: key.slice( index + 1 )
+ };
+ }
+
+ /* 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,
+
+ /**
+ * Start loading of all queued module dependencies.
+ *
+ * @protected
+ */
+ work: function () {
+ var q, batch, implementations, sourceModules;
+
+ batch = [];
+
+ // Appends a list of modules from the queue to the batch
+ for ( q = 0; q < queue.length; q++ ) {
+ // Only load modules which are registered
+ if ( hasOwn.call( registry, queue[ q ] ) && registry[ queue[ q ] ].state === 'registered' ) {
+ // Prevent duplicate entries
+ if ( batch.indexOf( queue[ q ] ) === -1 ) {
+ batch.push( queue[ q ] );
+ // Mark registered modules as loading
+ registry[ queue[ q ] ].state = 'loading';
+ }
+ }
+ }
+
+ // Now that the queue has been processed into a batch, clear the queue.
+ // This MUST happen before we initiate any eval or network request. Otherwise,
+ // it is possible for a cached script to instantly trigger the same work queue
+ // again; all before we've cleared it causing each request to include modules
+ // which are already loaded.
+ queue = [];
+
+ if ( !batch.length ) {
+ return;
+ }
+
+ mw.loader.store.init();
+ if ( mw.loader.store.enabled ) {
+ implementations = [];
+ sourceModules = [];
+ batch = batch.filter( function ( module ) {
+ var implementation = mw.loader.store.get( module );
+ if ( implementation ) {
+ implementations.push( implementation );
+ sourceModules.push( module );
+ return false;
+ }
+ return true;
+ } );
+ asyncEval( implementations, function ( err ) {
+ var failed;
+ // 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.
+ mw.loader.store.stats.failed++;
+
+ // 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();
+
+ mw.track( 'resourceloader.exception', { exception: err, source: 'store-eval' } );
+ // Re-add the failed ones that are still pending back to the batch
+ failed = sourceModules.filter( function ( module ) {
+ return registry[ module ].state === 'loading';
+ } );
+ batchRequest( failed );
+ } );
+ }
+
+ batchRequest( batch );
+ },
+
+ /**
+ * 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, deps;
+ // 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 );
+ }
+ if ( typeof dependencies === 'string' ) {
+ // A single module name
+ deps = [ dependencies ];
+ } else if ( typeof dependencies === 'object' || typeof dependencies === 'function' ) {
+ // Array of module names or a function that returns an array
+ deps = dependencies;
+ }
+ // 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: deps || [],
+ group: typeof group === 'string' ? group : null,
+ source: typeof source === 'string' ? source : 'local',
+ state: 'registered',
+ skip: typeof skip === 'string' ? skip : null
+ };
+ },
+
+ /**
+ * 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 and current module version. Formatted
+ * as '`[name]@[version]`". This version should match the requested version
+ * (from #batchRequest and #registry). This avoids race conditions (T117587).
+ * For back-compat with MediaWiki 1.27 and earlier, the version may be omitted.
+ * @param {Function|Array|string} [script] Function with module code, list of URLs
+ * to load via `<script src>`, or string of module code for `$.globalEval()`.
+ * @param {Object} [style] Should follow one of the following patterns:
+ *
+ * { "css": [css, ..] }
+ * { "url": { <media>: [url, ..] } }
+ *
+ * And for backwards compatibility (needs to be supported forever due to caching):
+ *
+ * { <media>: css }
+ * { <media>: [url, ..] }
+ *
+ * The reason css strings are not concatenated anymore is T33676. We now check
+ * whether it's safe to extend the stylesheet.
+ *
+ * @protected
+ * @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 ) {
+ var split = splitModuleKey( module ),
+ name = split.name,
+ version = split.version;
+ // Automatically register module
+ if ( !hasOwn.call( registry, name ) ) {
+ mw.loader.register( name );
+ }
+ // Check for duplicate implementation
+ if ( hasOwn.call( registry, name ) && registry[ name ].script !== undefined ) {
+ throw new Error( 'module already implemented: ' + name );
+ }
+ if ( version ) {
+ // Without this reset, if there is a version mismatch between the
+ // requested and received module version, then mw.loader.store would
+ // cache the response under the requested key. Thus poisoning the cache
+ // indefinitely with a stale value. (T117587)
+ registry[ name ].version = version;
+ }
+ // Attach components
+ registry[ name ].script = script || null;
+ registry[ name ].style = style || null;
+ registry[ name ].messages = messages || null;
+ registry[ name ].templates = templates || null;
+ // The module may already have been marked as erroneous
+ if ( registry[ name ].state !== 'error' && registry[ name ].state !== 'missing' ) {
+ registry[ name ].state = 'loaded';
+ if ( allReady( registry[ name ].dependencies ) ) {
+ execute( name );
+ }
+ }
+ },
+
+ /**
+ * 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 ] );
+ * } );
+ *
+ * Example of inline dependency obtained via `require()`:
+ *
+ * mw.loader.using( [ 'mediawiki.util' ], function ( require ) {
+ * var util = require( 'mediawiki.util' );
+ * } );
+ *
+ * Since MediaWiki 1.23 this also returns a promise.
+ *
+ * Since MediaWiki 1.28 the promise is resolved with a `require` function.
+ *
+ * @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} With a `require` function
+ */
+ 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 );
+ }
+
+ try {
+ // Resolve entire dependency map
+ dependencies = resolve( dependencies );
+ } catch ( e ) {
+ return deferred.reject( e ).promise();
+ }
+ if ( allReady( dependencies ) ) {
+ // Run ready immediately
+ deferred.resolve( mw.loader.require );
+ } 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, add to the load queue
+ enqueue( dependencies, function () {
+ deferred.resolve( mw.loader.require );
+ }, deferred.reject );
+ }
+
+ return deferred.promise();
+ },
+
+ /**
+ * Load an external script or one or more modules.
+ *
+ * This method takes a list of unrelated modules. Use cases:
+ *
+ * - A web page will be composed of many different widgets. These widgets independently
+ * queue their ResourceLoader modules (`OutputPage::addModules()`). If any of them
+ * have problems, or are no longer known (e.g. cached HTML), the other modules
+ * should still be loaded.
+ * - This method is used for preloading, which must not throw. Later code that
+ * calls #using() will handle the error.
+ *
+ * @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' ) {
+ l = document.createElement( 'link' );
+ l.rel = 'stylesheet';
+ l.href = modules;
+ document.head.appendChild( 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 top-level modules that are unknown or failed to load before.
+ filtered = modules.filter( function ( module ) {
+ var state = mw.loader.getState( module );
+ return state !== 'error' && state !== 'missing';
+ } );
+ // Resolve remaining list using the known dependency tree.
+ // This also filters out modules with unknown dependencies. (T36853)
+ filtered = resolveStubbornly( filtered );
+ // If all modules are ready, or if any modules have errors, nothing to be done.
+ if ( allReady( filtered ) || anyFailed( filtered ) ) {
+ return;
+ }
+ if ( filtered.length === 0 ) {
+ return;
+ }
+ // Some modules are not yet ready, add to module load queue.
+ enqueue( 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 );
+ }
+ registry[ module ].state = state;
+ if ( state === 'ready' || state === 'error' || state === 'missing' ) {
+ // Make sure pending modules depending on this one get executed if their
+ // dependencies are now fulfilled!
+ handlePending( module );
+ }
+ },
+
+ /**
+ * 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 ) {
+ return hasOwn.call( registry, module ) ? registry[ module ].version : null;
+ },
+
+ /**
+ * 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 ) {
+ return hasOwn.call( registry, module ) ? registry[ module ].state : null;
+ },
+
+ /**
+ * Get the names of all registered modules.
+ *
+ * @return {Array}
+ */
+ getModuleNames: function () {
+ return Object.keys( registry );
+ },
+
+ /**
+ * Get the exported value of a module.
+ *
+ * This static method is publicly exposed for debugging purposes
+ * only and must not be used in production code. In production code,
+ * please use the dynamically provided `require()` function instead.
+ *
+ * In case of lazy-loaded modules via mw.loader#using(), the returned
+ * Promise provides the function, see #using() for examples.
+ *
+ * @private
+ * @since 1.27
+ * @param {string} moduleName Module name
+ * @return {Mixed} Exported value
+ */
+ 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,
+
+ // Modules whose string representation exceeds 100 kB are
+ // ineligible for storage. See bug T66721.
+ MODULE_SIZE_MAX: 100 * 1000,
+
+ // The contents of the store, mapping '[name]@[version]' keys
+ // to module implementations.
+ items: {},
+
+ // Cache hit stats
+ stats: { hits: 0, misses: 0, expired: 0, failed: 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( ':' );
+ },
+
+ /**
+ * 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:
+ * <https://github.com/Modernizr/Modernizr/blob/v2.7.1/modernizr.js#L771-L796>.
+ */
+ 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 <https://bugzilla.mozilla.org/show_bug.cgi?id=1064466>.
+ /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 = 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
+ * @return {boolean} Module was set
+ */
+ set: function ( module, descriptor ) {
+ var args, key, src;
+
+ if ( !mw.loader.store.enabled ) {
+ return false;
+ }
+
+ key = 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 ||
+ descriptor.group === 'private' ||
+ descriptor.group === 'user' ||
+ // Partial descriptor
+ // (e.g. skipped module, or style module with state=ready)
+ [ descriptor.script, descriptor.style, descriptor.messages,
+ descriptor.templates ].indexOf( undefined ) !== -1
+ ) {
+ // Decline to store
+ return false;
+ }
+
+ try {
+ args = [
+ JSON.stringify( key ),
+ 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 false;
+ }
+
+ 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();
+ return true;
+ },
+
+ /**
+ * Iterate through the module store, removing any item that does not correspond
+ * (in name and version) to an item in the module registry.
+ *
+ * @return {boolean} Store was pruned
+ */
+ 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 ( 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 ];
+ }
+ }
+ return true;
+ },
+
+ /**
+ * 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 ); // <div><img src="&lt;"/></div>
+ *
+ * @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. `<br/>`.
+ * - 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 <https://www.w3.org/TR/html401/appendix/notes.html#h-B.3.2>.
+ * @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 += '</' + name + '>';
+ return s;
+ },
+
+ /**
+ * Wrapper object for raw HTML passed to mw.html.element().
+ *
+ * @class mw.html.Raw
+ * @constructor
+ * @param {string} value
+ */
+ Raw: function ( value ) {
+ this.value = value;
+ },
+
+ /**
+ * Wrapper object for CDATA element contents passed to mw.html.element()
+ *
+ * @class mw.html.Cdata
+ * @constructor
+ * @param {string} value
+ */
+ 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,
+
+ // eslint-disable-next-line valid-jsdoc
+ /**
+ * 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
+ * @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 logError( topic, data ) {
+ /* eslint-disable no-console */
+ 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 warning channel to trigger
+ // proper stacktraces in browsers that support it.
+ if ( e && console.warn ) {
+ console.warn( e );
+ }
+ }
+ /* eslint-enable no-console */
+ }
+
+ // Subscribe to error streams
+ mw.trackSubscribe( 'resourceloader.exception', logError );
+ mw.trackSubscribe( 'resourceloader.assert', logError );
+
+ /**
+ * Fired when all modules associated with the page have finished loading.
+ *
+ * @event resourceloader_loadEnd
+ * @member mw.hook
+ */
+ $( function () {
+ var loading, modules;
+
+ modules = mw.loader.getModuleNames().filter( function ( module ) {
+ return mw.loader.getState( module ) === 'loading';
+ } );
+ // We only need a callback, not any actual module. First try a single using()
+ // for all loading modules. If one fails, fall back to tracking each module
+ // separately via $.when(), this is expensive.
+ loading = mw.loader.using( modules ).catch( function () {
+ var all = modules.map( function ( module ) {
+ return mw.loader.using( module ).catch( function () {
+ return $.Deferred().resolve();
+ } );
+ } );
+ return $.when.apply( $, all );
+ } );
+ loading.then( function () {
+ /* global mwPerformance */
+ mwPerformance.mark( 'mwLoadEnd' );
+ mw.hook( 'resourceloader.loadEnd' ).fire();
+ } );
+ } );
+
+ // Attach to window and globally alias
+ window.mw = window.mediaWiki = mw;
+}( jQuery ) );
generated by cgit v1.2.1 (git 2.18.0) at 2024-05-04 21:09:26 +0000