resources/src/mediawiki.rcfilters/mw.rcfilters.Controller.js

   1 ( function ( mw, $ ) {
   2         /* eslint no-underscore-dangle: "off" */
   3         /**
   4          * Controller for the filters in Recent Changes
   5          *
   6          * @param {mw.rcfilters.dm.FiltersViewModel} filtersModel Filters view model
   7          * @param {mw.rcfilters.dm.ChangesListViewModel} changesListModel Changes list view model
   8          * @param {mw.rcfilters.dm.SavedQueriesModel} savedQueriesModel Saved queries model
   9          */
  10         mw.rcfilters.Controller = function MwRcfiltersController( filtersModel, changesListModel, savedQueriesModel ) {
  11                 this.filtersModel = filtersModel;
  12                 this.changesListModel = changesListModel;
  13                 this.savedQueriesModel = savedQueriesModel;
  14                 this.requestCounter = 0;
  15                 this.baseFilterState = {};
  16                 this.uriProcessor = null;
  17                 this.initializing = false;
  18         };
  19
  20         /* Initialization */
  21         OO.initClass( mw.rcfilters.Controller );
  22
  23         /**
  24          * Initialize the filter and parameter states
  25          *
  26          * @param {Array} filterStructure Filter definition and structure for the model
  27          * @param {Object} [namespaceStructure] Namespace definition
  28          * @param {Object} [tagList] Tag definition
  29          */
  30         mw.rcfilters.Controller.prototype.initialize = function ( filterStructure, namespaceStructure, tagList ) {
  31                 var parsedSavedQueries,
  32                         views = {},
  33                         items = [],
  34                         uri = new mw.Uri(),
  35                         $changesList = $( '.mw-changeslist' ).first().contents();
  36
  37                 // Prepare views
  38                 if ( namespaceStructure ) {
  39                         items = [];
  40                         $.each( namespaceStructure, function ( namespaceID, label ) {
  41                                 // Build and clean up the individual namespace items definition
  42                                 items.push( {
  43                                         name: namespaceID,
  44                                         label: label || mw.msg( 'blanknamespace' ),
  45                                         description: '',
  46                                         identifiers: [
  47                                                 ( namespaceID < 0 || namespaceID % 2 === 0 ) ?
  48                                                         'subject' : 'talk'
  49                                         ],
  50                                         cssClass: 'mw-changeslist-ns-' + namespaceID
  51                                 } );
  52                         } );
  53
  54                         views.namespaces = {
  55                                 title: mw.msg( 'namespaces' ),
  56                                 trigger: ':',
  57                                 groups: [ {
  58                                         // Group definition (single group)
  59                                         name: 'namespaces',
  60                                         definition: {
  61                                                 type: 'string_options',
  62                                                 title: mw.msg( 'namespaces' ),
  63                                                 labelPrefixKey: { 'default': 'rcfilters-tag-prefix-namespace', inverted: 'rcfilters-tag-prefix-namespace-inverted' },
  64                                                 separator: ';',
  65                                                 fullCoverage: true
  66                                         },
  67                                         items: items
  68                                 } ]
  69                         };
  70                 }
  71                 if ( tagList ) {
  72                         views.tags = {
  73                                 title: mw.msg( 'rcfilters-view-tags' ),
  74                                 trigger: '#',
  75                                 groups: [ {
  76                                         // Group definition (single group)
  77                                         name: 'tagfilter', // Parameter name
  78                                         definition: {
  79                                                 type: 'string_options',
  80                                                 title: 'rcfilters-view-tags', // Message key
  81                                                 labelPrefixKey: 'rcfilters-tag-prefix-tags',
  82                                                 separator: '|',
  83                                                 fullCoverage: false
  84                                         },
  85                                         items: tagList
  86                                 } ]
  87                         };
  88                 }
  89
  90                 // Initialize the model
  91                 this.filtersModel.initializeFilters( filterStructure, views );
  92
  93                 this._buildBaseFilterState();
  94
  95                 this.uriProcessor = new mw.rcfilters.UriProcessor(
  96                         this.filtersModel
  97                 );
  98
  99                 try {
 100                         parsedSavedQueries = JSON.parse( mw.user.options.get( 'rcfilters-saved-queries' ) || '{}' );
 101                 } catch ( err ) {
 102                         parsedSavedQueries = {};
 103                 }
 104
 105                 // The queries are saved in a minimized state, so we need
 106                 // to send over the base state so the saved queries model
 107                 // can normalize them per each query item
 108                 this.savedQueriesModel.initialize(
 109                         parsedSavedQueries,
 110                         this._getBaseFilterState()
 111                 );
 112
 113                 // Check whether we need to load defaults.
 114                 // We do this by checking whether the current URI query
 115                 // contains any parameters recognized by the system.
 116                 // If it does, we load the given state.
 117                 // If it doesn't, we have no values at all, and we assume
 118                 // the user loads the base-page and we load defaults.
 119                 // Defaults should only be applied on load (if necessary)
 120                 // or on request
 121                 this.initializing = true;
 122                 if (
 123                         this.savedQueriesModel.getDefault() &&
 124                         !this.uriProcessor.doesQueryContainRecognizedParams( uri.query )
 125                 ) {
 126                         // We have defaults from a saved query.
 127                         // We will load them straight-forward (as if
 128                         // they were clicked in the menu) so we trigger
 129                         // a full ajax request and change of URL
 130                         this.applySavedQuery( this.savedQueriesModel.getDefault() );
 131                 } else {
 132                         // There are either recognized parameters in the URL
 133                         // or there are none, but there is also no default
 134                         // saved query (so defaults are from the backend)
 135                         // We want to update the state but not fetch results
 136                         // again
 137                         this.updateStateFromUrl( false );
 138
 139                         // Update the changes list with the existing data
 140                         // so it gets processed
 141                         this.changesListModel.update(
 142                                 $changesList.length ? $changesList : 'NO_RESULTS',
 143                                 $( 'fieldset.rcoptions' ).first()
 144                         );
 145                 }
 146
 147                 this.initializing = false;
 148                 this.switchView( 'default' );
 149         };
 150
 151         /**
 152          * Switch the view of the filters model
 153          *
 154          * @param {string} view Requested view
 155          */
 156         mw.rcfilters.Controller.prototype.switchView = function ( view ) {
 157                 this.filtersModel.switchView( view );
 158         };
 159
 160         /**
 161          * Reset to default filters
 162          */
 163         mw.rcfilters.Controller.prototype.resetToDefaults = function () {
 164                 this.uriProcessor.updateModelBasedOnQuery( this._getDefaultParams() );
 165                 this.updateChangesList();
 166         };
 167
 168         /**
 169          * Empty all selected filters
 170          */
 171         mw.rcfilters.Controller.prototype.emptyFilters = function () {
 172                 var highlightedFilterNames = this.filtersModel
 173                         .getHighlightedItems()
 174                         .map( function ( filterItem ) { return { name: filterItem.getName() }; } );
 175
 176                 this.filtersModel.emptyAllFilters();
 177                 this.filtersModel.clearAllHighlightColors();
 178                 // Check all filter interactions
 179                 this.filtersModel.reassessFilterInteractions();
 180
 181                 this.updateChangesList();
 182
 183                 if ( highlightedFilterNames ) {
 184                         this._trackHighlight( 'clearAll', highlightedFilterNames );
 185                 }
 186         };
 187
 188         /**
 189          * Update the selected state of a filter
 190          *
 191          * @param {string} filterName Filter name
 192          * @param {boolean} [isSelected] Filter selected state
 193          */
 194         mw.rcfilters.Controller.prototype.toggleFilterSelect = function ( filterName, isSelected ) {
 195                 var filterItem = this.filtersModel.getItemByName( filterName );
 196
 197                 if ( !filterItem ) {
 198                         // If no filter was found, break
 199                         return;
 200                 }
 201
 202                 isSelected = isSelected === undefined ? !filterItem.isSelected() : isSelected;
 203
 204                 if ( filterItem.isSelected() !== isSelected ) {
 205                         this.filtersModel.toggleFilterSelected( filterName, isSelected );
 206
 207                         this.updateChangesList();
 208
 209                         // Check filter interactions
 210                         this.filtersModel.reassessFilterInteractions( filterItem );
 211                 }
 212         };
 213
 214         /**
 215          * Clear both highlight and selection of a filter
 216          *
 217          * @param {string} filterName Name of the filter item
 218          */
 219         mw.rcfilters.Controller.prototype.clearFilter = function ( filterName ) {
 220                 var filterItem = this.filtersModel.getItemByName( filterName ),
 221                         isHighlighted = filterItem.isHighlighted();
 222
 223                 if ( filterItem.isSelected() || isHighlighted ) {
 224                         this.filtersModel.clearHighlightColor( filterName );
 225                         this.filtersModel.toggleFilterSelected( filterName, false );
 226                         this.updateChangesList();
 227                         this.filtersModel.reassessFilterInteractions( filterItem );
 228                 }
 229
 230                 if ( isHighlighted ) {
 231                         this._trackHighlight( 'clear', filterName );
 232                 }
 233         };
 234
 235         /**
 236          * Toggle the highlight feature on and off
 237          */
 238         mw.rcfilters.Controller.prototype.toggleHighlight = function () {
 239                 this.filtersModel.toggleHighlight();
 240                 this._updateURL();
 241
 242                 if ( this.filtersModel.isHighlightEnabled() ) {
 243                         mw.hook( 'RcFilters.highlight.enable' ).fire();
 244                 }
 245         };
 246
 247         /**
 248          * Toggle the namespaces inverted feature on and off
 249          */
 250         mw.rcfilters.Controller.prototype.toggleInvertedNamespaces = function () {
 251                 this.filtersModel.toggleInvertedNamespaces();
 252                 this.updateChangesList();
 253         };
 254
 255         /**
 256          * Set the highlight color for a filter item
 257          *
 258          * @param {string} filterName Name of the filter item
 259          * @param {string} color Selected color
 260          */
 261         mw.rcfilters.Controller.prototype.setHighlightColor = function ( filterName, color ) {
 262                 this.filtersModel.setHighlightColor( filterName, color );
 263                 this._updateURL();
 264                 this._trackHighlight( 'set', { name: filterName, color: color } );
 265         };
 266
 267         /**
 268          * Clear highlight for a filter item
 269          *
 270          * @param {string} filterName Name of the filter item
 271          */
 272         mw.rcfilters.Controller.prototype.clearHighlightColor = function ( filterName ) {
 273                 this.filtersModel.clearHighlightColor( filterName );
 274                 this._updateURL();
 275                 this._trackHighlight( 'clear', filterName );
 276         };
 277
 278         /**
 279          * Save the current model state as a saved query
 280          *
 281          * @param {string} [label] Label of the saved query
 282          */
 283         mw.rcfilters.Controller.prototype.saveCurrentQuery = function ( label ) {
 284                 var highlightedItems = {},
 285                         highlightEnabled = this.filtersModel.isHighlightEnabled();
 286
 287                 // Prepare highlights
 288                 this.filtersModel.getHighlightedItems().forEach( function ( item ) {
 289                         highlightedItems[ item.getName() ] = highlightEnabled ?
 290                                 item.getHighlightColor() : null;
 291                 } );
 292                 // These are filter states; highlight is stored as boolean
 293                 highlightedItems.highlight = this.filtersModel.isHighlightEnabled();
 294
 295                 // Add item
 296                 this.savedQueriesModel.addNewQuery(
 297                         label || mw.msg( 'rcfilters-savedqueries-defaultlabel' ),
 298                         {
 299                                 filters: this.filtersModel.getSelectedState(),
 300                                 highlights: highlightedItems,
 301                                 invert: this.filtersModel.areNamespacesInverted()
 302                         }
 303                 );
 304
 305                 // Save item
 306                 this._saveSavedQueries();
 307         };
 308
 309         /**
 310          * Remove a saved query
 311          *
 312          * @param {string} queryID Query id
 313          */
 314         mw.rcfilters.Controller.prototype.removeSavedQuery = function ( queryID ) {
 315                 this.savedQueriesModel.removeQuery( queryID );
 316
 317                 this._saveSavedQueries();
 318         };
 319
 320         /**
 321          * Rename a saved query
 322          *
 323          * @param {string} queryID Query id
 324          * @param {string} newLabel New label for the query
 325          */
 326         mw.rcfilters.Controller.prototype.renameSavedQuery = function ( queryID, newLabel ) {
 327                 var queryItem = this.savedQueriesModel.getItemByID( queryID );
 328
 329                 if ( queryItem ) {
 330                         queryItem.updateLabel( newLabel );
 331                 }
 332                 this._saveSavedQueries();
 333         };
 334
 335         /**
 336          * Set a saved query as default
 337          *
 338          * @param {string} queryID Query Id. If null is given, default
 339          *  query is reset.
 340          */
 341         mw.rcfilters.Controller.prototype.setDefaultSavedQuery = function ( queryID ) {
 342                 this.savedQueriesModel.setDefault( queryID );
 343                 this._saveSavedQueries();
 344         };
 345
 346         /**
 347          * Load a saved query
 348          *
 349          * @param {string} queryID Query id
 350          */
 351         mw.rcfilters.Controller.prototype.applySavedQuery = function ( queryID ) {
 352                 var data, highlights,
 353                         queryItem = this.savedQueriesModel.getItemByID( queryID );
 354
 355                 if ( queryItem ) {
 356                         data = queryItem.getData();
 357                         highlights = data.highlights;
 358
 359                         // Backwards compatibility; initial version mispelled 'highlight' with 'highlights'
 360                         highlights.highlight = highlights.highlights || highlights.highlight;
 361
 362                         // Update model state from filters
 363                         this.filtersModel.toggleFiltersSelected( data.filters );
 364
 365                         // Update namespace inverted property
 366                         this.filtersModel.toggleInvertedNamespaces( !!Number( data.invert ) );
 367
 368                         // Update highlight state
 369                         this.filtersModel.toggleHighlight( !!Number( highlights.highlight ) );
 370                         this.filtersModel.getItems().forEach( function ( filterItem ) {
 371                                 var color = highlights[ filterItem.getName() ];
 372                                 if ( color ) {
 373                                         filterItem.setHighlightColor( color );
 374                                 } else {
 375                                         filterItem.clearHighlightColor();
 376                                 }
 377                         } );
 378
 379                         // Check all filter interactions
 380                         this.filtersModel.reassessFilterInteractions();
 381
 382                         this.updateChangesList();
 383                 }
 384         };
 385
 386         /**
 387          * Check whether the current filter and highlight state exists
 388          * in the saved queries model.
 389          *
 390          * @return {boolean} Query exists
 391          */
 392         mw.rcfilters.Controller.prototype.findQueryMatchingCurrentState = function () {
 393                 var highlightedItems = {};
 394
 395                 // Prepare highlights of the current query
 396                 this.filtersModel.getItemsSupportingHighlights().forEach( function ( item ) {
 397                         highlightedItems[ item.getName() ] = item.getHighlightColor();
 398                 } );
 399                 highlightedItems.highlight = this.filtersModel.isHighlightEnabled();
 400
 401                 return this.savedQueriesModel.findMatchingQuery(
 402                         {
 403                                 filters: this.filtersModel.getSelectedState(),
 404                                 highlights: highlightedItems,
 405                                 invert: this.filtersModel.areNamespacesInverted()
 406                         }
 407                 );
 408         };
 409
 410         /**
 411          * Get an object representing the base state of parameters
 412          * and highlights.
 413          *
 414          * This is meant to make sure that the saved queries that are
 415          * in memory are always the same structure as what we would get
 416          * by calling the current model's "getSelectedState" and by checking
 417          * highlight items.
 418          *
 419          * In cases where a user saved a query when the system had a certain
 420          * set of filters, and then a filter was added to the system, we want
 421          * to make sure that the stored queries can still be comparable to
 422          * the current state, which means that we need the base state for
 423          * two operations:
 424          *
 425          * - Saved queries are stored in "minimal" view (only changed filters
 426          *   are stored); When we initialize the system, we merge each minimal
 427          *   query with the base state (using 'getNormalizedFilters') so all
 428          *   saved queries have the exact same structure as what we would get
 429          *   by checking the getSelectedState of the filter.
 430          * - When we save the queries, we minimize the object to only represent
 431          *   whatever has actually changed, rather than store the entire
 432          *   object. To check what actually is different so we can store it,
 433          *   we need to obtain a base state to compare against, this is
 434          *   what #_getMinimalFilterList does
 435          */
 436         mw.rcfilters.Controller.prototype._buildBaseFilterState = function () {
 437                 var defaultParams = this.filtersModel.getDefaultParams(),
 438                         highlightedItems = {};
 439
 440                 // Prepare highlights
 441                 this.filtersModel.getItemsSupportingHighlights().forEach( function ( item ) {
 442                         highlightedItems[ item.getName() ] = null;
 443                 } );
 444                 highlightedItems.highlight = false;
 445
 446                 this.baseFilterState = {
 447                         filters: this.filtersModel.getFiltersFromParameters( defaultParams ),
 448                         highlights: highlightedItems,
 449                         invert: false
 450                 };
 451         };
 452
 453         /**
 454          * Get an object representing the base filter state of both
 455          * filters and highlights. The structure is similar to what we use
 456          * to store each query in the saved queries object:
 457          * {
 458          *    filters: {
 459          *        filterName: (bool)
 460          *    },
 461          *    highlights: {
 462          *        filterName: (string|null)
 463          *    }
 464          * }
 465          *
 466          * @return {Object} Object representing the base state of
 467          *  parameters and highlights
 468          */
 469         mw.rcfilters.Controller.prototype._getBaseFilterState = function () {
 470                 return this.baseFilterState;
 471         };
 472
 473         /**
 474          * Get an object that holds only the parameters and highlights that have
 475          * values different than the base default value.
 476          *
 477          * This is the reverse of the normalization we do initially on loading and
 478          * initializing the saved queries model.
 479          *
 480          * @param {Object} valuesObject Object representing the state of both
 481          *  filters and highlights in its normalized version, to be minimized.
 482          * @return {Object} Minimal filters and highlights list
 483          */
 484         mw.rcfilters.Controller.prototype._getMinimalFilterList = function ( valuesObject ) {
 485                 var result = { filters: {}, highlights: {} },
 486                         baseState = this._getBaseFilterState();
 487
 488                 // XOR results
 489                 $.each( valuesObject.filters, function ( name, value ) {
 490                         if ( baseState.filters !== undefined && baseState.filters[ name ] !== value ) {
 491                                 result.filters[ name ] = value;
 492                         }
 493                 } );
 494
 495                 $.each( valuesObject.highlights, function ( name, value ) {
 496                         if ( baseState.highlights !== undefined && baseState.highlights[ name ] !== value ) {
 497                                 result.highlights[ name ] = value;
 498                         }
 499                 } );
 500
 501                 return result;
 502         };
 503
 504         /**
 505          * Save the current state of the saved queries model with all
 506          * query item representation in the user settings.
 507          */
 508         mw.rcfilters.Controller.prototype._saveSavedQueries = function () {
 509                 var stringified,
 510                         state = this.savedQueriesModel.getState(),
 511                         controller = this;
 512
 513                 // Minimize before save
 514                 $.each( state.queries, function ( queryID, info ) {
 515                         state.queries[ queryID ].data = controller._getMinimalFilterList( info.data );
 516                 } );
 517
 518                 // Stringify state
 519                 stringified = JSON.stringify( state );
 520
 521                 if ( stringified.length > 65535 ) {
 522                         // Sanity check, since the preference can only hold that.
 523                         return;
 524                 }
 525
 526                 // Save the preference
 527                 new mw.Api().saveOption( 'rcfilters-saved-queries', stringified );
 528                 // Update the preference for this session
 529                 mw.user.options.set( 'rcfilters-saved-queries', stringified );
 530         };
 531
 532         /**
 533          * Synchronize the URL with the current state of the filters
 534          * without adding an history entry.
 535          */
 536         mw.rcfilters.Controller.prototype.replaceUrl = function () {
 537                 mw.rcfilters.UriProcessor.static.replaceState( this._getUpdatedUri() );
 538         };
 539
 540         /**
 541          * Update filter state (selection and highlighting) based
 542          * on current URL values.
 543          *
 544          * @param {boolean} [fetchChangesList=true] Fetch new results into the changes
 545          *  list based on the updated model.
 546          */
 547         mw.rcfilters.Controller.prototype.updateStateFromUrl = function ( fetchChangesList ) {
 548                 fetchChangesList = fetchChangesList === undefined ? true : !!fetchChangesList;
 549
 550                 this.uriProcessor.updateModelBasedOnQuery( new mw.Uri().query );
 551
 552                 // Only update and fetch new results if it is requested
 553                 if ( fetchChangesList ) {
 554                         this.updateChangesList();
 555                 }
 556         };
 557
 558         /**
 559          * Update the list of changes and notify the model
 560          *
 561          * @param {Object} [params] Extra parameters to add to the API call
 562          */
 563         mw.rcfilters.Controller.prototype.updateChangesList = function ( params ) {
 564                 this._updateURL( params );
 565                 this.changesListModel.invalidate();
 566                 this._fetchChangesList()
 567                         .then(
 568                                 // Success
 569                                 function ( pieces ) {
 570                                         var $changesListContent = pieces.changes,
 571                                                 $fieldset = pieces.fieldset;
 572                                         this.changesListModel.update( $changesListContent, $fieldset );
 573                                 }.bind( this )
 574                                 // Do nothing for failure
 575                         );
 576         };
 577
 578         /**
 579          * Get an object representing the default parameter state, whether
 580          * it is from the model defaults or from the saved queries.
 581          *
 582          * @return {Object} Default parameters
 583          */
 584         mw.rcfilters.Controller.prototype._getDefaultParams = function () {
 585                 var data, queryHighlights,
 586                         savedParams = {},
 587                         savedHighlights = {},
 588                         defaultSavedQueryItem = this.savedQueriesModel.getItemByID( this.savedQueriesModel.getDefault() );
 589
 590                 if ( mw.config.get( 'wgStructuredChangeFiltersEnableSaving' ) &&
 591                         defaultSavedQueryItem ) {
 592
 593                         data = defaultSavedQueryItem.getData();
 594
 595                         queryHighlights = data.highlights || {};
 596                         savedParams = this.filtersModel.getParametersFromFilters( data.filters || {} );
 597
 598                         // Translate highlights to parameters
 599                         savedHighlights.highlight = String( Number( queryHighlights.highlight ) );
 600                         $.each( queryHighlights, function ( filterName, color ) {
 601                                 if ( filterName !== 'highlights' ) {
 602                                         savedHighlights[ filterName + '_color' ] = color;
 603                                 }
 604                         } );
 605
 606                         return $.extend( true, {}, savedParams, savedHighlights, { invert: data.invert } );
 607                 }
 608
 609                 return $.extend(
 610                         { highlight: '0' },
 611                         this.filtersModel.getDefaultParams()
 612                 );
 613         };
 614
 615         /**
 616          * Get an object representing the default parameter state, whether
 617          * it is from the model defaults or from the saved queries.
 618          *
 619          * @return {Object} Default parameters
 620          */
 621         mw.rcfilters.Controller.prototype._getDefaultParams = function () {
 622                 var data, queryHighlights,
 623                         savedParams = {},
 624                         savedHighlights = {},
 625                         defaultSavedQueryItem = this.savedQueriesModel.getItemByID( this.savedQueriesModel.getDefault() );
 626
 627                 if ( mw.config.get( 'wgStructuredChangeFiltersEnableSaving' ) &&
 628                         defaultSavedQueryItem ) {
 629
 630                         data = defaultSavedQueryItem.getData();
 631
 632                         queryHighlights = data.highlights || {};
 633                         savedParams = this.filtersModel.getParametersFromFilters( data.filters || {} );
 634
 635                         // Translate highlights to parameters
 636                         savedHighlights.highlight = String( Number( queryHighlights.highlight ) );
 637                         $.each( queryHighlights, function ( filterName, color ) {
 638                                 if ( filterName !== 'highlights' ) {
 639                                         savedHighlights[ filterName + '_color' ] = color;
 640                                 }
 641                         } );
 642
 643                         return $.extend( true, {}, savedParams, savedHighlights );
 644                 }
 645
 646                 return this.filtersModel.getDefaultParams();
 647         };
 648
 649         /**
 650          * Update the URL of the page to reflect current filters
 651          *
 652          * This should not be called directly from outside the controller.
 653          * If an action requires changing the URL, it should either use the
 654          * highlighting actions below, or call #updateChangesList which does
 655          * the uri corrections already.
 656          *
 657          * @param {Object} [params] Extra parameters to add to the API call
 658          */
 659         mw.rcfilters.Controller.prototype._updateURL = function ( params ) {
 660                 var currentUri = new mw.Uri(),
 661                         updatedUri = this._getUpdatedUri();
 662
 663                 updatedUri.extend( params || {} );
 664
 665                 if (
 666                         this.uriProcessor.getVersion( currentUri.query ) !== 2 ||
 667                         this.uriProcessor.isNewState( currentUri.query, updatedUri.query )
 668                 ) {
 669                         mw.rcfilters.UriProcessor.static.replaceState( updatedUri );
 670                 }
 671         };
 672
 673         /**
 674          * Get an updated mw.Uri object based on the model state
 675          *
 676          * @return {mw.Uri} Updated Uri
 677          */
 678         mw.rcfilters.Controller.prototype._getUpdatedUri = function () {
 679                 var uri = new mw.Uri();
 680
 681                 // Minimize url
 682                 uri.query = this.uriProcessor.minimizeQuery(
 683                         $.extend(
 684                                 true,
 685                                 {},
 686                                 // We want to retain unrecognized params
 687                                 // The uri params from model will override
 688                                 // any recognized value in the current uri
 689                                 // query, retain unrecognized params, and
 690                                 // the result will then be minimized
 691                                 uri.query,
 692                                 this.uriProcessor.getUriParametersFromModel(),
 693                                 { urlversion: '2' }
 694                         )
 695                 );
 696
 697                 return uri;
 698         };
 699
 700         /**
 701          * Fetch the list of changes from the server for the current filters
 702          *
 703          * @return {jQuery.Promise} Promise object that will resolve with the changes list
 704          *  or with a string denoting no results.
 705          */
 706         mw.rcfilters.Controller.prototype._fetchChangesList = function () {
 707                 var uri = this._getUpdatedUri(),
 708                         requestId = ++this.requestCounter,
 709                         latestRequest = function () {
 710                                 return requestId === this.requestCounter;
 711                         }.bind( this );
 712
 713                 return $.ajax( uri.toString(), { contentType: 'html' } )
 714                         .then(
 715                                 // Success
 716                                 function ( html ) {
 717                                         var $parsed;
 718                                         if ( !latestRequest() ) {
 719                                                 return $.Deferred().reject();
 720                                         }
 721
 722                                         $parsed = $( $.parseHTML( html ) );
 723
 724                                         return {
 725                                                 // Changes list
 726                                                 changes: $parsed.find( '.mw-changeslist' ).first().contents(),
 727                                                 // Fieldset
 728                                                 fieldset: $parsed.find( 'fieldset.rcoptions' ).first()
 729                                         };
 730                                 },
 731                                 // Failure
 732                                 function ( responseObj ) {
 733                                         var $parsed;
 734
 735                                         if ( !latestRequest() ) {
 736                                                 return $.Deferred().reject();
 737                                         }
 738
 739                                         $parsed = $( $.parseHTML( responseObj.responseText ) );
 740
 741                                         // Force a resolve state to this promise
 742                                         return $.Deferred().resolve( {
 743                                                 changes: 'NO_RESULTS',
 744                                                 fieldset: $parsed.find( 'fieldset.rcoptions' ).first()
 745                                         } ).promise();
 746                                 }
 747                         );
 748         };
 749
 750         /**
 751          * Track usage of highlight feature
 752          *
 753          * @param {string} action
 754          * @param {array|object|string} filters
 755          */
 756         mw.rcfilters.Controller.prototype._trackHighlight = function ( action, filters ) {
 757                 filters = typeof filters === 'string' ? { name: filters } : filters;
 758                 filters = !Array.isArray( filters ) ? [ filters ] : filters;
 759                 mw.track(
 760                         'event.ChangesListHighlights',
 761                         {
 762                                 action: action,
 763                                 filters: filters,
 764                                 userId: mw.user.getId()
 765                         }
 766                 );
 767         };
 768
 769 }( mediaWiki, jQuery ) );