resources/src/mediawiki.base/mediawiki.base.js

   1 /*!
   2  * This file is currently loaded as part of the 'mediawiki' module and therefore
   3  * concatenated to mediawiki.js and executed at the same time. This file exists
   4  * to help prepare for splitting up the 'mediawiki' module.
   5  * This effort is tracked at https://phabricator.wikimedia.org/T192623
   6  *
   7  * In short:
   8  *
   9  * - mediawiki.js will be reduced to the minimum needed to define mw.loader and
  10  *   mw.config, and then moved to its own private "mediawiki.loader" module that
  11  *   can be embedded within the StartupModule response.
  12  *
  13  * - mediawiki.base.js and other files in this directory will remain part of the
  14  *   "mediawiki" module, and will remain a default/implicit dependency for all
  15  *   regular modules, just like jquery and wikibits already are.
  16  */
  17 ( function () {
  18         'use strict';
  19
  20         var slice = Array.prototype.slice,
  21                 mwLoaderTrack = mw.track,
  22                 trackCallbacks = $.Callbacks( 'memory' ),
  23                 trackHandlers = [],
  24                 queue;
  25
  26         /**
  27          * Object constructor for messages.
  28          *
  29          * Similar to the Message class in MediaWiki PHP.
  30          *
  31          * Format defaults to 'text'.
  32          *
  33          *     @example
  34          *
  35          *     var obj, str;
  36          *     mw.messages.set( {
  37          *         'hello': 'Hello world',
  38          *         'hello-user': 'Hello, $1!',
  39          *         'welcome-user': 'Welcome back to $2, $1! Last visit by $1: $3'
  40          *     } );
  41          *
  42          *     obj = new mw.Message( mw.messages, 'hello' );
  43          *     mw.log( obj.text() );
  44          *     // Hello world
  45          *
  46          *     obj = new mw.Message( mw.messages, 'hello-user', [ 'John Doe' ] );
  47          *     mw.log( obj.text() );
  48          *     // Hello, John Doe!
  49          *
  50          *     obj = new mw.Message( mw.messages, 'welcome-user', [ 'John Doe', 'Wikipedia', '2 hours ago' ] );
  51          *     mw.log( obj.text() );
  52          *     // Welcome back to Wikipedia, John Doe! Last visit by John Doe: 2 hours ago
  53          *
  54          *     // Using mw.message shortcut
  55          *     obj = mw.message( 'hello-user', 'John Doe' );
  56          *     mw.log( obj.text() );
  57          *     // Hello, John Doe!
  58          *
  59          *     // Using mw.msg shortcut
  60          *     str = mw.msg( 'hello-user', 'John Doe' );
  61          *     mw.log( str );
  62          *     // Hello, John Doe!
  63          *
  64          *     // Different formats
  65          *     obj = new mw.Message( mw.messages, 'hello-user', [ 'John "Wiki" <3 Doe' ] );
  66          *
  67          *     obj.format = 'text';
  68          *     str = obj.toString();
  69          *     // Same as:
  70          *     str = obj.text();
  71          *
  72          *     mw.log( str );
  73          *     // Hello, John "Wiki" <3 Doe!
  74          *
  75          *     mw.log( obj.escaped() );
  76          *     // Hello, John &quot;Wiki&quot; &lt;3 Doe!
  77          *
  78          * @class mw.Message
  79          *
  80          * @constructor
  81          * @param {mw.Map} map Message store
  82          * @param {string} key
  83          * @param {Array} [parameters]
  84          */
  85         function Message( map, key, parameters ) {
  86                 this.format = 'text';
  87                 this.map = map;
  88                 this.key = key;
  89                 this.parameters = parameters === undefined ? [] : slice.call( parameters );
  90                 return this;
  91         }
  92
  93         Message.prototype = {
  94                 /**
  95                  * Get parsed contents of the message.
  96                  *
  97                  * The default parser does simple $N replacements and nothing else.
  98                  * This may be overridden to provide a more complex message parser.
  99                  * The primary override is in the mediawiki.jqueryMsg module.
 100                  *
 101                  * This function will not be called for nonexistent messages.
 102                  *
 103                  * @return {string} Parsed message
 104                  */
 105                 parser: function () {
 106                         return mw.format.apply( null, [ this.map.get( this.key ) ].concat( this.parameters ) );
 107                 },
 108
 109                 /**
 110                  * Add (does not replace) parameters for `$N` placeholder values.
 111                  *
 112                  * @param {Array} parameters
 113                  * @return {mw.Message}
 114                  * @chainable
 115                  */
 116                 params: function ( parameters ) {
 117                         var i;
 118                         for ( i = 0; i < parameters.length; i++ ) {
 119                                 this.parameters.push( parameters[ i ] );
 120                         }
 121                         return this;
 122                 },
 123
 124                 /**
 125                  * Convert message object to its string form based on current format.
 126                  *
 127                  * @return {string} Message as a string in the current form, or `<key>` if key
 128                  *  does not exist.
 129                  */
 130                 toString: function () {
 131                         var text;
 132
 133                         if ( !this.exists() ) {
 134                                 // Use ⧼key⧽ as text if key does not exist
 135                                 // Err on the side of safety, ensure that the output
 136                                 // is always html safe in the event the message key is
 137                                 // missing, since in that case its highly likely the
 138                                 // message key is user-controlled.
 139                                 // '⧼' is used instead of '<' to side-step any
 140                                 // double-escaping issues.
 141                                 // (Keep synchronised with Message::toString() in PHP.)
 142                                 return '⧼' + mw.html.escape( this.key ) + '⧽';
 143                         }
 144
 145                         if ( this.format === 'plain' || this.format === 'text' || this.format === 'parse' ) {
 146                                 text = this.parser();
 147                         }
 148
 149                         if ( this.format === 'escaped' ) {
 150                                 text = this.parser();
 151                                 text = mw.html.escape( text );
 152                         }
 153
 154                         return text;
 155                 },
 156
 157                 /**
 158                  * Change format to 'parse' and convert message to string
 159                  *
 160                  * If jqueryMsg is loaded, this parses the message text from wikitext
 161                  * (where supported) to HTML
 162                  *
 163                  * Otherwise, it is equivalent to plain.
 164                  *
 165                  * @return {string} String form of parsed message
 166                  */
 167                 parse: function () {
 168                         this.format = 'parse';
 169                         return this.toString();
 170                 },
 171
 172                 /**
 173                  * Change format to 'plain' and convert message to string
 174                  *
 175                  * This substitutes parameters, but otherwise does not change the
 176                  * message text.
 177                  *
 178                  * @return {string} String form of plain message
 179                  */
 180                 plain: function () {
 181                         this.format = 'plain';
 182                         return this.toString();
 183                 },
 184
 185                 /**
 186                  * Change format to 'text' and convert message to string
 187                  *
 188                  * If jqueryMsg is loaded, {{-transformation is done where supported
 189                  * (such as {{plural:}}, {{gender:}}, {{int:}}).
 190                  *
 191                  * Otherwise, it is equivalent to plain
 192                  *
 193                  * @return {string} String form of text message
 194                  */
 195                 text: function () {
 196                         this.format = 'text';
 197                         return this.toString();
 198                 },
 199
 200                 /**
 201                  * Change the format to 'escaped' and convert message to string
 202                  *
 203                  * This is equivalent to using the 'text' format (see #text), then
 204                  * HTML-escaping the output.
 205                  *
 206                  * @return {string} String form of html escaped message
 207                  */
 208                 escaped: function () {
 209                         this.format = 'escaped';
 210                         return this.toString();
 211                 },
 212
 213                 /**
 214                  * Check if a message exists
 215                  *
 216                  * @see mw.Map#exists
 217                  * @return {boolean}
 218                  */
 219                 exists: function () {
 220                         return this.map.exists( this.key );
 221                 }
 222         };
 223
 224         /**
 225          * @class mw
 226          * @singleton
 227          */
 228
 229         /**
 230          * @inheritdoc mw.inspect#runReports
 231          * @method
 232          */
 233         mw.inspect = function () {
 234                 var args = arguments;
 235                 // Lazy-load
 236                 mw.loader.using( 'mediawiki.inspect', function () {
 237                         mw.inspect.runReports.apply( mw.inspect, args );
 238                 } );
 239         };
 240
 241         /**
 242          * Format a string. Replace $1, $2 ... $N with positional arguments.
 243          *
 244          * Used by Message#parser().
 245          *
 246          * @since 1.25
 247          * @param {string} formatString Format string
 248          * @param {...Mixed} parameters Values for $N replacements
 249          * @return {string} Formatted string
 250          */
 251         mw.format = function ( formatString ) {
 252                 var parameters = slice.call( arguments, 1 );
 253                 return formatString.replace( /\$(\d+)/g, function ( str, match ) {
 254                         var index = parseInt( match, 10 ) - 1;
 255                         return parameters[ index ] !== undefined ? parameters[ index ] : '$' + match;
 256                 } );
 257         };
 258
 259         // Expose Message constructor
 260         mw.Message = Message;
 261
 262         /**
 263          * Get a message object.
 264          *
 265          * Shortcut for `new mw.Message( mw.messages, key, parameters )`.
 266          *
 267          * @see mw.Message
 268          * @param {string} key Key of message to get
 269          * @param {...Mixed} parameters Values for $N replacements
 270          * @return {mw.Message}
 271          */
 272         mw.message = function ( key ) {
 273                 var parameters = slice.call( arguments, 1 );
 274                 return new Message( mw.messages, key, parameters );
 275         };
 276
 277         /**
 278          * Get a message string using the (default) 'text' format.
 279          *
 280          * Shortcut for `mw.message( key, parameters... ).text()`.
 281          *
 282          * @see mw.Message
 283          * @param {string} key Key of message to get
 284          * @param {...Mixed} parameters Values for $N replacements
 285          * @return {string}
 286          */
 287         mw.msg = function () {
 288                 return mw.message.apply( mw.message, arguments ).toString();
 289         };
 290
 291         /**
 292          * Track an analytic event.
 293          *
 294          * This method provides a generic means for MediaWiki JavaScript code to capture state
 295          * information for analysis. Each logged event specifies a string topic name that describes
 296          * the kind of event that it is. Topic names consist of dot-separated path components,
 297          * arranged from most general to most specific. Each path component should have a clear and
 298          * well-defined purpose.
 299          *
 300          * Data handlers are registered via `mw.trackSubscribe`, and receive the full set of
 301          * events that match their subcription, including those that fired before the handler was
 302          * bound.
 303          *
 304          * @param {string} topic Topic name
 305          * @param {Object} [data] Data describing the event, encoded as an object
 306          */
 307         mw.track = function ( topic, data ) {
 308                 mwLoaderTrack( topic, data );
 309                 trackCallbacks.fire( mw.trackQueue );
 310         };
 311
 312         /**
 313          * Register a handler for subset of analytic events, specified by topic.
 314          *
 315          * Handlers will be called once for each tracked event, including any events that fired before the
 316          * handler was registered; 'this' is set to a plain object with a 'timeStamp' property indicating
 317          * the exact time at which the event fired, a string 'topic' property naming the event, and a
 318          * 'data' property which is an object of event-specific data. The event topic and event data are
 319          * also passed to the callback as the first and second arguments, respectively.
 320          *
 321          * @param {string} topic Handle events whose name starts with this string prefix
 322          * @param {Function} callback Handler to call for each matching tracked event
 323          * @param {string} callback.topic
 324          * @param {Object} [callback.data]
 325          */
 326         mw.trackSubscribe = function ( topic, callback ) {
 327                 var seen = 0;
 328                 function handler( trackQueue ) {
 329                         var event;
 330                         for ( ; seen < trackQueue.length; seen++ ) {
 331                                 event = trackQueue[ seen ];
 332                                 if ( event.topic.indexOf( topic ) === 0 ) {
 333                                         callback.call( event, event.topic, event.data );
 334                                 }
 335                         }
 336                 }
 337
 338                 trackHandlers.push( [ handler, callback ] );
 339
 340                 trackCallbacks.add( handler );
 341         };
 342
 343         /**
 344          * Stop handling events for a particular handler
 345          *
 346          * @param {Function} callback
 347          */
 348         mw.trackUnsubscribe = function ( callback ) {
 349                 trackHandlers = trackHandlers.filter( function ( fns ) {
 350                         if ( fns[ 1 ] === callback ) {
 351                                 trackCallbacks.remove( fns[ 0 ] );
 352                                 // Ensure the tuple is removed to avoid holding on to closures
 353                                 return false;
 354                         }
 355                         return true;
 356                 } );
 357         };
 358
 359         // Fire events from before track() triggered fire()
 360         trackCallbacks.fire( mw.trackQueue );
 361
 362         /**
 363          * Registry and firing of events.
 364          *
 365          * MediaWiki has various interface components that are extended, enhanced
 366          * or manipulated in some other way by extensions, gadgets and even
 367          * in core itself.
 368          *
 369          * This framework helps streamlining the timing of when these other
 370          * code paths fire their plugins (instead of using document-ready,
 371          * which can and should be limited to firing only once).
 372          *
 373          * Features like navigating to other wiki pages, previewing an edit
 374          * and editing itself – without a refresh – can then retrigger these
 375          * hooks accordingly to ensure everything still works as expected.
 376          *
 377          * Example usage:
 378          *
 379          *     mw.hook( 'wikipage.content' ).add( fn ).remove( fn );
 380          *     mw.hook( 'wikipage.content' ).fire( $content );
 381          *
 382          * Handlers can be added and fired for arbitrary event names at any time. The same
 383          * event can be fired multiple times. The last run of an event is memorized
 384          * (similar to `$(document).ready` and `$.Deferred().done`).
 385          * This means if an event is fired, and a handler added afterwards, the added
 386          * function will be fired right away with the last given event data.
 387          *
 388          * Like Deferreds and Promises, the mw.hook object is both detachable and chainable.
 389          * Thus allowing flexible use and optimal maintainability and authority control.
 390          * You can pass around the `add` and/or `fire` method to another piece of code
 391          * without it having to know the event name (or `mw.hook` for that matter).
 392          *
 393          *     var h = mw.hook( 'bar.ready' );
 394          *     new mw.Foo( .. ).fetch( { callback: h.fire } );
 395          *
 396          * Note: Events are documented with an underscore instead of a dot in the event
 397          * name due to jsduck not supporting dots in that position.
 398          *
 399          * @class mw.hook
 400          */
 401         mw.hook = ( function () {
 402                 var lists = Object.create( null );
 403
 404                 /**
 405                  * Create an instance of mw.hook.
 406                  *
 407                  * @method hook
 408                  * @member mw
 409                  * @param {string} name Name of hook.
 410                  * @return {mw.hook}
 411                  */
 412                 return function ( name ) {
 413                         var list = lists[ name ] || ( lists[ name ] = $.Callbacks( 'memory' ) );
 414
 415                         return {
 416                                 /**
 417                                  * Register a hook handler
 418                                  *
 419                                  * @param {...Function} handler Function to bind.
 420                                  * @chainable
 421                                  */
 422                                 add: list.add,
 423
 424                                 /**
 425                                  * Unregister a hook handler
 426                                  *
 427                                  * @param {...Function} handler Function to unbind.
 428                                  * @chainable
 429                                  */
 430                                 remove: list.remove,
 431
 432                                 /**
 433                                  * Run a hook.
 434                                  *
 435                                  * @param {...Mixed} data
 436                                  * @return {mw.hook}
 437                                  * @chainable
 438                                  */
 439                                 fire: function () {
 440                                         return list.fireWith.call( this, null, slice.call( arguments ) );
 441                                 }
 442                         };
 443                 };
 444         }() );
 445
 446         /**
 447          * HTML construction helper functions
 448          *
 449          *     @example
 450          *
 451          *     var Html, output;
 452          *
 453          *     Html = mw.html;
 454          *     output = Html.element( 'div', {}, new Html.Raw(
 455          *         Html.element( 'img', { src: '<' } )
 456          *     ) );
 457          *     mw.log( output ); // <div><img src="&lt;"/></div>
 458          *
 459          * @class mw.html
 460          * @singleton
 461          */
 462         mw.html = ( function () {
 463                 function escapeCallback( s ) {
 464                         switch ( s ) {
 465                                 case '\'':
 466                                         return '&#039;';
 467                                 case '"':
 468                                         return '&quot;';
 469                                 case '<':
 470                                         return '&lt;';
 471                                 case '>':
 472                                         return '&gt;';
 473                                 case '&':
 474                                         return '&amp;';
 475                         }
 476                 }
 477
 478                 return {
 479                         /**
 480                          * Escape a string for HTML.
 481                          *
 482                          * Converts special characters to HTML entities.
 483                          *
 484                          *     mw.html.escape( '< > \' & "' );
 485                          *     // Returns &lt; &gt; &#039; &amp; &quot;
 486                          *
 487                          * @param {string} s The string to escape
 488                          * @return {string} HTML
 489                          */
 490                         escape: function ( s ) {
 491                                 return s.replace( /['"<>&]/g, escapeCallback );
 492                         },
 493
 494                         /**
 495                          * Create an HTML element string, with safe escaping.
 496                          *
 497                          * @param {string} name The tag name.
 498                          * @param {Object} [attrs] An object with members mapping element names to values
 499                          * @param {string|mw.html.Raw|mw.html.Cdata|null} [contents=null] The contents of the element.
 500                          *
 501                          *  - string: Text to be escaped.
 502                          *  - null: The element is treated as void with short closing form, e.g. `<br/>`.
 503                          *  - this.Raw: The raw value is directly included.
 504                          *  - this.Cdata: The raw value is directly included. An exception is
 505                          *    thrown if it contains any illegal ETAGO delimiter.
 506                          *    See <https://www.w3.org/TR/html401/appendix/notes.html#h-B.3.2>.
 507                          * @return {string} HTML
 508                          */
 509                         element: function ( name, attrs, contents ) {
 510                                 var v, attrName, s = '<' + name;
 511
 512                                 if ( attrs ) {
 513                                         for ( attrName in attrs ) {
 514                                                 v = attrs[ attrName ];
 515                                                 // Convert name=true, to name=name
 516                                                 if ( v === true ) {
 517                                                         v = attrName;
 518                                                         // Skip name=false
 519                                                 } else if ( v === false ) {
 520                                                         continue;
 521                                                 }
 522                                                 s += ' ' + attrName + '="' + this.escape( String( v ) ) + '"';
 523                                         }
 524                                 }
 525                                 if ( contents === undefined || contents === null ) {
 526                                         // Self close tag
 527                                         s += '/>';
 528                                         return s;
 529                                 }
 530                                 // Regular open tag
 531                                 s += '>';
 532                                 switch ( typeof contents ) {
 533                                         case 'string':
 534                                                 // Escaped
 535                                                 s += this.escape( contents );
 536                                                 break;
 537                                         case 'number':
 538                                         case 'boolean':
 539                                                 // Convert to string
 540                                                 s += String( contents );
 541                                                 break;
 542                                         default:
 543                                                 if ( contents instanceof this.Raw ) {
 544                                                         // Raw HTML inclusion
 545                                                         s += contents.value;
 546                                                 } else if ( contents instanceof this.Cdata ) {
 547                                                         // CDATA
 548                                                         if ( /<\/[a-zA-z]/.test( contents.value ) ) {
 549                                                                 throw new Error( 'Illegal end tag found in CDATA' );
 550                                                         }
 551                                                         s += contents.value;
 552                                                 } else {
 553                                                         throw new Error( 'Invalid type of contents' );
 554                                                 }
 555                                 }
 556                                 s += '</' + name + '>';
 557                                 return s;
 558                         },
 559
 560                         /**
 561                          * Wrapper object for raw HTML passed to mw.html.element().
 562                          *
 563                          * @class mw.html.Raw
 564                          * @constructor
 565                          * @param {string} value
 566                          */
 567                         Raw: function ( value ) {
 568                                 this.value = value;
 569                         },
 570
 571                         /**
 572                          * Wrapper object for CDATA element contents passed to mw.html.element()
 573                          *
 574                          * @class mw.html.Cdata
 575                          * @constructor
 576                          * @param {string} value
 577                          */
 578                         Cdata: function ( value ) {
 579                                 this.value = value;
 580                         }
 581                 };
 582         }() );
 583
 584         /**
 585          * Execute a function as soon as one or more required modules are ready.
 586          *
 587          * Example of inline dependency on OOjs:
 588          *
 589          *     mw.loader.using( 'oojs', function () {
 590          *         OO.compare( [ 1 ], [ 1 ] );
 591          *     } );
 592          *
 593          * Example of inline dependency obtained via `require()`:
 594          *
 595          *     mw.loader.using( [ 'mediawiki.util' ], function ( require ) {
 596          *         var util = require( 'mediawiki.util' );
 597          *     } );
 598          *
 599          * Since MediaWiki 1.23 this also returns a promise.
 600          *
 601          * Since MediaWiki 1.28 the promise is resolved with a `require` function.
 602          *
 603          * @member mw.loader
 604          * @param {string|Array} dependencies Module name or array of modules names the
 605          *  callback depends on to be ready before executing
 606          * @param {Function} [ready] Callback to execute when all dependencies are ready
 607          * @param {Function} [error] Callback to execute if one or more dependencies failed
 608          * @return {jQuery.Promise} With a `require` function
 609          */
 610         mw.loader.using = function ( dependencies, ready, error ) {
 611                 var deferred = $.Deferred();
 612
 613                 // Allow calling with a single dependency as a string
 614                 if ( typeof dependencies === 'string' ) {
 615                         dependencies = [ dependencies ];
 616                 }
 617
 618                 if ( ready ) {
 619                         deferred.done( ready );
 620                 }
 621                 if ( error ) {
 622                         deferred.fail( error );
 623                 }
 624
 625                 try {
 626                         // Resolve entire dependency map
 627                         dependencies = mw.loader.resolve( dependencies );
 628                 } catch ( e ) {
 629                         return deferred.reject( e ).promise();
 630                 }
 631
 632                 mw.loader.enqueue( dependencies, function () {
 633                         deferred.resolve( mw.loader.require );
 634                 }, deferred.reject );
 635
 636                 return deferred.promise();
 637         };
 638
 639         // Alias $j to jQuery for backwards compatibility
 640         // @deprecated since 1.23 Use $ or jQuery instead
 641         mw.log.deprecate( window, '$j', $, 'Use $ or jQuery instead.' );
 642
 643         // Process callbacks for Grade A that require modules.
 644         // Plain ones were already processed by startup.js.
 645         queue = window.RLQ;
 646         // Redefine publicly to capture any late arrivals
 647         window.RLQ = {
 648                 push: function ( entry ) {
 649                         mw.loader.using( entry[ 0 ], entry[ 1 ] );
 650                 }
 651         };
 652         while ( queue[ 0 ] ) {
 653                 window.RLQ.push( queue.shift() );
 654         }
 655 }() );