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          * @class
   6          *
   7          * @constructor
   8          * @param {mw.rcfilters.dm.FiltersViewModel} filtersModel Filters view model
   9          * @param {mw.rcfilters.dm.ChangesListViewModel} changesListModel Changes list view model
  10          * @param {mw.rcfilters.dm.SavedQueriesModel} savedQueriesModel Saved queries model
  11          */
  12         mw.rcfilters.Controller = function MwRcfiltersController( filtersModel, changesListModel, savedQueriesModel ) {
  13                 this.filtersModel = filtersModel;
  14                 this.changesListModel = changesListModel;
  15                 this.savedQueriesModel = savedQueriesModel;
  16                 this.requestCounter = 0;
  17                 this.baseFilterState = {};
  18                 this.uriProcessor = null;
  19                 this.initializing = false;
  20
  21                 this.prevLoggedItems = [];
  22         };
  23
  24         /* Initialization */
  25         OO.initClass( mw.rcfilters.Controller );
  26
  27         /**
  28          * Initialize the filter and parameter states
  29          *
  30          * @param {Array} filterStructure Filter definition and structure for the model
  31          * @param {Object} [namespaceStructure] Namespace definition
  32          * @param {Object} [tagList] Tag definition
  33          */
  34         mw.rcfilters.Controller.prototype.initialize = function ( filterStructure, namespaceStructure, tagList ) {
  35                 var parsedSavedQueries,
  36                         controller = this,
  37                         views = {},
  38                         items = [],
  39                         uri = new mw.Uri(),
  40                         $changesList = $( '.mw-changeslist' ).first().contents();
  41
  42                 // Prepare views
  43                 if ( namespaceStructure ) {
  44                         items = [];
  45                         $.each( namespaceStructure, function ( namespaceID, label ) {
  46                                 // Build and clean up the individual namespace items definition
  47                                 items.push( {
  48                                         name: namespaceID,
  49                                         label: label || mw.msg( 'blanknamespace' ),
  50                                         description: '',
  51                                         identifiers: [
  52                                                 ( namespaceID < 0 || namespaceID % 2 === 0 ) ?
  53                                                         'subject' : 'talk'
  54                                         ],
  55                                         cssClass: 'mw-changeslist-ns-' + namespaceID
  56                                 } );
  57                         } );
  58
  59                         views.namespaces = {
  60                                 title: mw.msg( 'namespaces' ),
  61                                 trigger: ':',
  62                                 groups: [ {
  63                                         // Group definition (single group)
  64                                         name: 'namespace', // parameter name is singular
  65                                         type: 'string_options',
  66                                         title: mw.msg( 'namespaces' ),
  67                                         labelPrefixKey: { 'default': 'rcfilters-tag-prefix-namespace', inverted: 'rcfilters-tag-prefix-namespace-inverted' },
  68                                         separator: ';',
  69                                         fullCoverage: true,
  70                                         filters: items
  71                                 } ]
  72                         };
  73                 }
  74                 if ( tagList ) {
  75                         views.tags = {
  76                                 title: mw.msg( 'rcfilters-view-tags' ),
  77                                 trigger: '#',
  78                                 groups: [ {
  79                                         // Group definition (single group)
  80                                         name: 'tagfilter', // Parameter name
  81                                         type: 'string_options',
  82                                         title: 'rcfilters-view-tags', // Message key
  83                                         labelPrefixKey: 'rcfilters-tag-prefix-tags',
  84                                         separator: '|',
  85                                         fullCoverage: false,
  86                                         filters: tagList
  87                                 } ]
  88                         };
  89                 }
  90
  91                 // Add parameter range operations
  92                 views.range = {
  93                         groups: [
  94                                 {
  95                                         name: 'limit',
  96                                         type: 'single_option',
  97                                         title: '', // Because it's a hidden group, this title actually appears nowhere
  98                                         hidden: true,
  99                                         allowArbitrary: true,
 100                                         validate: $.isNumeric,
 101                                         sortFunc: function ( a, b ) { return Number( a.name ) - Number( b.name ); },
 102                                         'default': mw.user.options.get( 'rclimit' ),
 103                                         filters: [ 50, 100, 250, 500 ].map( function ( num ) {
 104                                                 return controller._createFilterDataFromNumber( num, num );
 105                                         } )
 106                                 },
 107                                 {
 108                                         name: 'days',
 109                                         type: 'single_option',
 110                                         title: '', // Because it's a hidden group, this title actually appears nowhere
 111                                         hidden: true,
 112                                         allowArbitrary: true,
 113                                         validate: $.isNumeric,
 114                                         sortFunc: function ( a, b ) { return Number( a.name ) - Number( b.name ); },
 115                                         numToLabelFunc: function ( i ) {
 116                                                 return Number( i ) < 1 ?
 117                                                         ( Number( i ) * 24 ).toFixed( 2 ) :
 118                                                         Number( i );
 119                                         },
 120                                         'default': mw.user.options.get( 'rcdays' ),
 121                                         filters: [
 122                                                 // Hours (1, 2, 6, 12)
 123                                                 0.04166, 0.0833, 0.25, 0.5,
 124                                                 // Days
 125                                                 1, 3, 7, 14, 30
 126                                         ].map( function ( num ) {
 127                                                 return controller._createFilterDataFromNumber(
 128                                                         num,
 129                                                         // Convert fractions of days to number of hours for the labels
 130                                                         num < 1 ? Math.round( num * 24 ) : num
 131                                                 );
 132                                         } )
 133                                 }
 134                         ]
 135                 };
 136
 137                 // Before we do anything, we need to see if we require additional items in the
 138                 // groups that have 'AllowArbitrary'. For the moment, those are only single_option
 139                 // groups; if we ever expand it, this might need further generalization:
 140                 $.each( views, function ( viewName, viewData ) {
 141                         viewData.groups.forEach( function ( groupData ) {
 142                                 var extraValues = [];
 143                                 if ( groupData.allowArbitrary ) {
 144                                         // If the value in the URI isn't in the group, add it
 145                                         if ( uri.query[ groupData.name ] !== undefined ) {
 146                                                 extraValues.push( uri.query[ groupData.name ] );
 147                                         }
 148                                         // If the default value isn't in the group, add it
 149                                         if ( groupData.default !== undefined ) {
 150                                                 extraValues.push( String( groupData.default ) );
 151                                         }
 152                                         controller.addNumberValuesToGroup( groupData, extraValues );
 153                                 }
 154                         } );
 155                 } );
 156
 157                 // Initialize the model
 158                 this.filtersModel.initializeFilters( filterStructure, views );
 159
 160                 this._buildBaseFilterState();
 161
 162                 this.uriProcessor = new mw.rcfilters.UriProcessor(
 163                         this.filtersModel
 164                 );
 165
 166                 try {
 167                         parsedSavedQueries = JSON.parse( mw.user.options.get( 'rcfilters-saved-queries' ) || '{}' );
 168                 } catch ( err ) {
 169                         parsedSavedQueries = {};
 170                 }
 171
 172                 // The queries are saved in a minimized state, so we need
 173                 // to send over the base state so the saved queries model
 174                 // can normalize them per each query item
 175                 this.savedQueriesModel.initialize(
 176                         parsedSavedQueries,
 177                         this._getBaseFilterState()
 178                 );
 179
 180                 // Check whether we need to load defaults.
 181                 // We do this by checking whether the current URI query
 182                 // contains any parameters recognized by the system.
 183                 // If it does, we load the given state.
 184                 // If it doesn't, we have no values at all, and we assume
 185                 // the user loads the base-page and we load defaults.
 186                 // Defaults should only be applied on load (if necessary)
 187                 // or on request
 188                 this.initializing = true;
 189                 if (
 190                         this.savedQueriesModel.getDefault() &&
 191                         !this.uriProcessor.doesQueryContainRecognizedParams( uri.query )
 192                 ) {
 193                         // We have defaults from a saved query.
 194                         // We will load them straight-forward (as if
 195                         // they were clicked in the menu) so we trigger
 196                         // a full ajax request and change of URL
 197                         this.applySavedQuery( this.savedQueriesModel.getDefault() );
 198                 } else {
 199                         // There are either recognized parameters in the URL
 200                         // or there are none, but there is also no default
 201                         // saved query (so defaults are from the backend)
 202                         // We want to update the state but not fetch results
 203                         // again
 204                         this.updateStateFromUrl( false );
 205
 206                         // Update the changes list with the existing data
 207                         // so it gets processed
 208                         this.changesListModel.update(
 209                                 $changesList.length ? $changesList : 'NO_RESULTS',
 210                                 $( 'fieldset.rcoptions' ).first(),
 211                                 true // We're using existing DOM elements
 212                         );
 213                 }
 214
 215                 this.initializing = false;
 216                 this.switchView( 'default' );
 217         };
 218
 219         /**
 220          * Create filter data from a number, for the filters that are numerical value
 221          *
 222          * @param {Number} num Number
 223          * @param {Number} numForDisplay Number for the label
 224          * @return {Object} Filter data
 225          */
 226         mw.rcfilters.Controller.prototype._createFilterDataFromNumber = function ( num, numForDisplay ) {
 227                 return {
 228                         name: String( num ),
 229                         label: mw.language.convertNumber( numForDisplay )
 230                 };
 231         };
 232
 233         /**
 234          * Add an arbitrary values to groups that allow arbitrary values
 235          *
 236          * @param {Object} groupData Group data
 237          * @param {string|string[]} arbitraryValues An array of arbitrary values to add to the group
 238          */
 239         mw.rcfilters.Controller.prototype.addNumberValuesToGroup = function ( groupData, arbitraryValues ) {
 240                 var controller = this;
 241
 242                 arbitraryValues = Array.isArray( arbitraryValues ) ? arbitraryValues : [ arbitraryValues ];
 243
 244                 // This is only true for single_option group
 245                 // We assume these are the only groups that will allow for
 246                 // arbitrary, since it doesn't make any sense for the other
 247                 // groups.
 248                 arbitraryValues.forEach( function ( val ) {
 249                         if (
 250                                 // If the group allows for arbitrary data
 251                                 groupData.allowArbitrary &&
 252                                 // and it is single_option (or string_options, but we
 253                                 // don't have cases of those yet, nor do we plan to)
 254                                 groupData.type === 'single_option' &&
 255                                 // and, if there is a validate method and it passes on
 256                                 // the data
 257                                 ( !groupData.validate || groupData.validate( val ) ) &&
 258                                 // but if that value isn't already in the definition
 259                                 groupData.filters
 260                                         .map( function ( filterData ) {
 261                                                 return filterData.name;
 262                                         } )
 263                                         .indexOf( val ) === -1
 264                         ) {
 265                                 // Add the filter information
 266                                 groupData.filters.push( controller._createFilterDataFromNumber(
 267                                         val,
 268                                         groupData.numToLabelFunc ?
 269                                                 groupData.numToLabelFunc( val ) :
 270                                                 val
 271                                 ) );
 272
 273                                 // If there's a sort function set up, re-sort the values
 274                                 if ( groupData.sortFunc ) {
 275                                         groupData.filters.sort( groupData.sortFunc );
 276                                 }
 277                         }
 278                 } );
 279         };
 280
 281         /**
 282          * Switch the view of the filters model
 283          *
 284          * @param {string} view Requested view
 285          */
 286         mw.rcfilters.Controller.prototype.switchView = function ( view ) {
 287                 this.filtersModel.switchView( view );
 288         };
 289
 290         /**
 291          * Reset to default filters
 292          */
 293         mw.rcfilters.Controller.prototype.resetToDefaults = function () {
 294                 this.uriProcessor.updateModelBasedOnQuery( this._getDefaultParams() );
 295                 this.updateChangesList();
 296         };
 297
 298         /**
 299          * Empty all selected filters
 300          */
 301         mw.rcfilters.Controller.prototype.emptyFilters = function () {
 302                 var highlightedFilterNames = this.filtersModel
 303                         .getHighlightedItems()
 304                         .map( function ( filterItem ) { return { name: filterItem.getName() }; } );
 305
 306                 this.filtersModel.emptyAllFilters();
 307                 this.filtersModel.clearAllHighlightColors();
 308                 // Check all filter interactions
 309                 this.filtersModel.reassessFilterInteractions();
 310
 311                 this.updateChangesList();
 312
 313                 if ( highlightedFilterNames ) {
 314                         this._trackHighlight( 'clearAll', highlightedFilterNames );
 315                 }
 316         };
 317
 318         /**
 319          * Update the selected state of a filter
 320          *
 321          * @param {string} filterName Filter name
 322          * @param {boolean} [isSelected] Filter selected state
 323          */
 324         mw.rcfilters.Controller.prototype.toggleFilterSelect = function ( filterName, isSelected ) {
 325                 var filterItem = this.filtersModel.getItemByName( filterName );
 326
 327                 if ( !filterItem ) {
 328                         // If no filter was found, break
 329                         return;
 330                 }
 331
 332                 isSelected = isSelected === undefined ? !filterItem.isSelected() : isSelected;
 333
 334                 if ( filterItem.isSelected() !== isSelected ) {
 335                         this.filtersModel.toggleFilterSelected( filterName, isSelected );
 336
 337                         this.updateChangesList();
 338
 339                         // Check filter interactions
 340                         this.filtersModel.reassessFilterInteractions( filterItem );
 341                 }
 342         };
 343
 344         /**
 345          * Clear both highlight and selection of a filter
 346          *
 347          * @param {string} filterName Name of the filter item
 348          */
 349         mw.rcfilters.Controller.prototype.clearFilter = function ( filterName ) {
 350                 var filterItem = this.filtersModel.getItemByName( filterName ),
 351                         isHighlighted = filterItem.isHighlighted();
 352
 353                 if ( filterItem.isSelected() || isHighlighted ) {
 354                         this.filtersModel.clearHighlightColor( filterName );
 355                         this.filtersModel.toggleFilterSelected( filterName, false );
 356                         this.updateChangesList();
 357                         this.filtersModel.reassessFilterInteractions( filterItem );
 358
 359                         // Log filter grouping
 360                         this.trackFilterGroupings( 'removefilter' );
 361                 }
 362
 363                 if ( isHighlighted ) {
 364                         this._trackHighlight( 'clear', filterName );
 365                 }
 366         };
 367
 368         /**
 369          * Toggle the highlight feature on and off
 370          */
 371         mw.rcfilters.Controller.prototype.toggleHighlight = function () {
 372                 this.filtersModel.toggleHighlight();
 373                 this._updateURL();
 374
 375                 if ( this.filtersModel.isHighlightEnabled() ) {
 376                         mw.hook( 'RcFilters.highlight.enable' ).fire();
 377                 }
 378         };
 379
 380         /**
 381          * Toggle the namespaces inverted feature on and off
 382          */
 383         mw.rcfilters.Controller.prototype.toggleInvertedNamespaces = function () {
 384                 this.filtersModel.toggleInvertedNamespaces();
 385                 this.updateChangesList();
 386         };
 387
 388         /**
 389          * Set the highlight color for a filter item
 390          *
 391          * @param {string} filterName Name of the filter item
 392          * @param {string} color Selected color
 393          */
 394         mw.rcfilters.Controller.prototype.setHighlightColor = function ( filterName, color ) {
 395                 this.filtersModel.setHighlightColor( filterName, color );
 396                 this._updateURL();
 397                 this._trackHighlight( 'set', { name: filterName, color: color } );
 398         };
 399
 400         /**
 401          * Clear highlight for a filter item
 402          *
 403          * @param {string} filterName Name of the filter item
 404          */
 405         mw.rcfilters.Controller.prototype.clearHighlightColor = function ( filterName ) {
 406                 this.filtersModel.clearHighlightColor( filterName );
 407                 this._updateURL();
 408                 this._trackHighlight( 'clear', filterName );
 409         };
 410
 411         /**
 412          * Enable or disable live updates.
 413          * @param {boolean} enable True to enable, false to disable
 414          */
 415         mw.rcfilters.Controller.prototype.toggleLiveUpdate = function ( enable ) {
 416                 if ( enable && !this.liveUpdateTimeout ) {
 417                         this._scheduleLiveUpdate();
 418                 } else if ( !enable && this.liveUpdateTimeout ) {
 419                         clearTimeout( this.liveUpdateTimeout );
 420                         this.liveUpdateTimeout = null;
 421                 }
 422         };
 423
 424         /**
 425          * Set a timeout for the next live update.
 426          * @private
 427          */
 428         mw.rcfilters.Controller.prototype._scheduleLiveUpdate = function () {
 429                 this.liveUpdateTimeout = setTimeout( this._doLiveUpdate.bind( this ), 3000 );
 430         };
 431
 432         /**
 433          * Perform a live update.
 434          * @private
 435          */
 436         mw.rcfilters.Controller.prototype._doLiveUpdate = function () {
 437                 var controller = this;
 438                 this.updateChangesList( {}, true )
 439                         .always( function () {
 440                                 if ( controller.liveUpdateTimeout ) {
 441                                         // Live update was not disabled in the meantime
 442                                         controller._scheduleLiveUpdate();
 443                                 }
 444                         } );
 445         };
 446
 447         /**
 448          * Save the current model state as a saved query
 449          *
 450          * @param {string} [label] Label of the saved query
 451          */
 452         mw.rcfilters.Controller.prototype.saveCurrentQuery = function ( label ) {
 453                 var highlightedItems = {},
 454                         highlightEnabled = this.filtersModel.isHighlightEnabled();
 455
 456                 // Prepare highlights
 457                 this.filtersModel.getHighlightedItems().forEach( function ( item ) {
 458                         highlightedItems[ item.getName() ] = highlightEnabled ?
 459                                 item.getHighlightColor() : null;
 460                 } );
 461                 // These are filter states; highlight is stored as boolean
 462                 highlightedItems.highlight = this.filtersModel.isHighlightEnabled();
 463
 464                 // Add item
 465                 this.savedQueriesModel.addNewQuery(
 466                         label || mw.msg( 'rcfilters-savedqueries-defaultlabel' ),
 467                         {
 468                                 filters: this.filtersModel.getSelectedState(),
 469                                 highlights: highlightedItems,
 470                                 invert: this.filtersModel.areNamespacesInverted()
 471                         }
 472                 );
 473
 474                 // Save item
 475                 this._saveSavedQueries();
 476         };
 477
 478         /**
 479          * Remove a saved query
 480          *
 481          * @param {string} queryID Query id
 482          */
 483         mw.rcfilters.Controller.prototype.removeSavedQuery = function ( queryID ) {
 484                 this.savedQueriesModel.removeQuery( queryID );
 485
 486                 this._saveSavedQueries();
 487         };
 488
 489         /**
 490          * Rename a saved query
 491          *
 492          * @param {string} queryID Query id
 493          * @param {string} newLabel New label for the query
 494          */
 495         mw.rcfilters.Controller.prototype.renameSavedQuery = function ( queryID, newLabel ) {
 496                 var queryItem = this.savedQueriesModel.getItemByID( queryID );
 497
 498                 if ( queryItem ) {
 499                         queryItem.updateLabel( newLabel );
 500                 }
 501                 this._saveSavedQueries();
 502         };
 503
 504         /**
 505          * Set a saved query as default
 506          *
 507          * @param {string} queryID Query Id. If null is given, default
 508          *  query is reset.
 509          */
 510         mw.rcfilters.Controller.prototype.setDefaultSavedQuery = function ( queryID ) {
 511                 this.savedQueriesModel.setDefault( queryID );
 512                 this._saveSavedQueries();
 513         };
 514
 515         /**
 516          * Load a saved query
 517          *
 518          * @param {string} queryID Query id
 519          */
 520         mw.rcfilters.Controller.prototype.applySavedQuery = function ( queryID ) {
 521                 var data, highlights,
 522                         queryItem = this.savedQueriesModel.getItemByID( queryID );
 523
 524                 if ( queryItem ) {
 525                         data = queryItem.getData();
 526                         highlights = data.highlights;
 527
 528                         // Backwards compatibility; initial version mispelled 'highlight' with 'highlights'
 529                         highlights.highlight = highlights.highlights || highlights.highlight;
 530
 531                         // Update model state from filters
 532                         this.filtersModel.toggleFiltersSelected( data.filters );
 533
 534                         // Update namespace inverted property
 535                         this.filtersModel.toggleInvertedNamespaces( !!Number( data.invert ) );
 536
 537                         // Update highlight state
 538                         this.filtersModel.toggleHighlight( !!Number( highlights.highlight ) );
 539                         this.filtersModel.getItems().forEach( function ( filterItem ) {
 540                                 var color = highlights[ filterItem.getName() ];
 541                                 if ( color ) {
 542                                         filterItem.setHighlightColor( color );
 543                                 } else {
 544                                         filterItem.clearHighlightColor();
 545                                 }
 546                         } );
 547
 548                         // Check all filter interactions
 549                         this.filtersModel.reassessFilterInteractions();
 550
 551                         this.updateChangesList();
 552
 553                         // Log filter grouping
 554                         this.trackFilterGroupings( 'savedfilters' );
 555                 }
 556         };
 557
 558         /**
 559          * Check whether the current filter and highlight state exists
 560          * in the saved queries model.
 561          *
 562          * @return {boolean} Query exists
 563          */
 564         mw.rcfilters.Controller.prototype.findQueryMatchingCurrentState = function () {
 565                 var highlightedItems = {};
 566
 567                 // Prepare highlights of the current query
 568                 this.filtersModel.getItemsSupportingHighlights().forEach( function ( item ) {
 569                         highlightedItems[ item.getName() ] = item.getHighlightColor();
 570                 } );
 571                 highlightedItems.highlight = this.filtersModel.isHighlightEnabled();
 572
 573                 return this.savedQueriesModel.findMatchingQuery(
 574                         {
 575                                 filters: this.filtersModel.getSelectedState(),
 576                                 highlights: highlightedItems,
 577                                 invert: this.filtersModel.areNamespacesInverted()
 578                         }
 579                 );
 580         };
 581
 582         /**
 583          * Get an object representing the base state of parameters
 584          * and highlights.
 585          *
 586          * This is meant to make sure that the saved queries that are
 587          * in memory are always the same structure as what we would get
 588          * by calling the current model's "getSelectedState" and by checking
 589          * highlight items.
 590          *
 591          * In cases where a user saved a query when the system had a certain
 592          * set of filters, and then a filter was added to the system, we want
 593          * to make sure that the stored queries can still be comparable to
 594          * the current state, which means that we need the base state for
 595          * two operations:
 596          *
 597          * - Saved queries are stored in "minimal" view (only changed filters
 598          *   are stored); When we initialize the system, we merge each minimal
 599          *   query with the base state (using 'getNormalizedFilters') so all
 600          *   saved queries have the exact same structure as what we would get
 601          *   by checking the getSelectedState of the filter.
 602          * - When we save the queries, we minimize the object to only represent
 603          *   whatever has actually changed, rather than store the entire
 604          *   object. To check what actually is different so we can store it,
 605          *   we need to obtain a base state to compare against, this is
 606          *   what #_getMinimalFilterList does
 607          */
 608         mw.rcfilters.Controller.prototype._buildBaseFilterState = function () {
 609                 var defaultParams = this.filtersModel.getDefaultParams(),
 610                         highlightedItems = {};
 611
 612                 // Prepare highlights
 613                 this.filtersModel.getItemsSupportingHighlights().forEach( function ( item ) {
 614                         highlightedItems[ item.getName() ] = null;
 615                 } );
 616                 highlightedItems.highlight = false;
 617
 618                 this.baseFilterState = {
 619                         filters: this.filtersModel.getFiltersFromParameters( defaultParams ),
 620                         highlights: highlightedItems,
 621                         invert: false
 622                 };
 623         };
 624
 625         /**
 626          * Get an object representing the base filter state of both
 627          * filters and highlights. The structure is similar to what we use
 628          * to store each query in the saved queries object:
 629          * {
 630          *    filters: {
 631          *        filterName: (bool)
 632          *    },
 633          *    highlights: {
 634          *        filterName: (string|null)
 635          *    }
 636          * }
 637          *
 638          * @return {Object} Object representing the base state of
 639          *  parameters and highlights
 640          */
 641         mw.rcfilters.Controller.prototype._getBaseFilterState = function () {
 642                 return this.baseFilterState;
 643         };
 644
 645         /**
 646          * Get an object that holds only the parameters and highlights that have
 647          * values different than the base default value.
 648          *
 649          * This is the reverse of the normalization we do initially on loading and
 650          * initializing the saved queries model.
 651          *
 652          * @param {Object} valuesObject Object representing the state of both
 653          *  filters and highlights in its normalized version, to be minimized.
 654          * @return {Object} Minimal filters and highlights list
 655          */
 656         mw.rcfilters.Controller.prototype._getMinimalFilterList = function ( valuesObject ) {
 657                 var result = { filters: {}, highlights: {} },
 658                         baseState = this._getBaseFilterState();
 659
 660                 // XOR results
 661                 $.each( valuesObject.filters, function ( name, value ) {
 662                         if ( baseState.filters !== undefined && baseState.filters[ name ] !== value ) {
 663                                 result.filters[ name ] = value;
 664                         }
 665                 } );
 666
 667                 $.each( valuesObject.highlights, function ( name, value ) {
 668                         if ( baseState.highlights !== undefined && baseState.highlights[ name ] !== value ) {
 669                                 result.highlights[ name ] = value;
 670                         }
 671                 } );
 672
 673                 return result;
 674         };
 675
 676         /**
 677          * Save the current state of the saved queries model with all
 678          * query item representation in the user settings.
 679          */
 680         mw.rcfilters.Controller.prototype._saveSavedQueries = function () {
 681                 var stringified,
 682                         state = this.savedQueriesModel.getState(),
 683                         controller = this;
 684
 685                 // Minimize before save
 686                 $.each( state.queries, function ( queryID, info ) {
 687                         state.queries[ queryID ].data = controller._getMinimalFilterList( info.data );
 688                 } );
 689
 690                 // Stringify state
 691                 stringified = JSON.stringify( state );
 692
 693                 if ( stringified.length > 65535 ) {
 694                         // Sanity check, since the preference can only hold that.
 695                         return;
 696                 }
 697
 698                 // Save the preference
 699                 new mw.Api().saveOption( 'rcfilters-saved-queries', stringified );
 700                 // Update the preference for this session
 701                 mw.user.options.set( 'rcfilters-saved-queries', stringified );
 702         };
 703
 704         /**
 705          * Synchronize the URL with the current state of the filters
 706          * without adding an history entry.
 707          */
 708         mw.rcfilters.Controller.prototype.replaceUrl = function () {
 709                 mw.rcfilters.UriProcessor.static.replaceState( this._getUpdatedUri() );
 710         };
 711
 712         /**
 713          * Update filter state (selection and highlighting) based
 714          * on current URL values.
 715          *
 716          * @param {boolean} [fetchChangesList=true] Fetch new results into the changes
 717          *  list based on the updated model.
 718          */
 719         mw.rcfilters.Controller.prototype.updateStateFromUrl = function ( fetchChangesList ) {
 720                 fetchChangesList = fetchChangesList === undefined ? true : !!fetchChangesList;
 721
 722                 this.uriProcessor.updateModelBasedOnQuery( new mw.Uri().query );
 723
 724                 // Only update and fetch new results if it is requested
 725                 if ( fetchChangesList ) {
 726                         this.updateChangesList();
 727                 }
 728         };
 729
 730         /**
 731          * Update the list of changes and notify the model
 732          *
 733          * @param {Object} [params] Extra parameters to add to the API call
 734          * @param {boolean} [isLiveUpdate] Don't update the URL or invalidate the changes list
 735          * @return {jQuery.Promise} Promise that is resolved when the update is complete
 736          */
 737         mw.rcfilters.Controller.prototype.updateChangesList = function ( params, isLiveUpdate ) {
 738                 if ( !isLiveUpdate ) {
 739                         this._updateURL( params );
 740                         this.changesListModel.invalidate();
 741                 }
 742                 return this._fetchChangesList()
 743                         .then(
 744                                 // Success
 745                                 function ( pieces ) {
 746                                         var $changesListContent = pieces.changes,
 747                                                 $fieldset = pieces.fieldset;
 748                                         this.changesListModel.update( $changesListContent, $fieldset );
 749                                 }.bind( this )
 750                                 // Do nothing for failure
 751                         );
 752         };
 753
 754         /**
 755          * Get an object representing the default parameter state, whether
 756          * it is from the model defaults or from the saved queries.
 757          *
 758          * @return {Object} Default parameters
 759          */
 760         mw.rcfilters.Controller.prototype._getDefaultParams = function () {
 761                 var data, queryHighlights,
 762                         savedParams = {},
 763                         savedHighlights = {},
 764                         defaultSavedQueryItem = this.savedQueriesModel.getItemByID( this.savedQueriesModel.getDefault() );
 765
 766                 if ( mw.config.get( 'wgStructuredChangeFiltersEnableSaving' ) &&
 767                         defaultSavedQueryItem ) {
 768
 769                         data = defaultSavedQueryItem.getData();
 770
 771                         queryHighlights = data.highlights || {};
 772                         savedParams = this.filtersModel.getParametersFromFilters( data.filters || {} );
 773
 774                         // Translate highlights to parameters
 775                         savedHighlights.highlight = String( Number( queryHighlights.highlight ) );
 776                         $.each( queryHighlights, function ( filterName, color ) {
 777                                 if ( filterName !== 'highlights' ) {
 778                                         savedHighlights[ filterName + '_color' ] = color;
 779                                 }
 780                         } );
 781
 782                         return $.extend( true, {}, savedParams, savedHighlights );
 783                 }
 784
 785                 return this.filtersModel.getDefaultParams();
 786         };
 787
 788         /**
 789          * Update the URL of the page to reflect current filters
 790          *
 791          * This should not be called directly from outside the controller.
 792          * If an action requires changing the URL, it should either use the
 793          * highlighting actions below, or call #updateChangesList which does
 794          * the uri corrections already.
 795          *
 796          * @param {Object} [params] Extra parameters to add to the API call
 797          */
 798         mw.rcfilters.Controller.prototype._updateURL = function ( params ) {
 799                 var currentUri = new mw.Uri(),
 800                         updatedUri = this._getUpdatedUri();
 801
 802                 updatedUri.extend( params || {} );
 803
 804                 if (
 805                         this.uriProcessor.getVersion( currentUri.query ) !== 2 ||
 806                         this.uriProcessor.isNewState( currentUri.query, updatedUri.query )
 807                 ) {
 808                         mw.rcfilters.UriProcessor.static.replaceState( updatedUri );
 809                 }
 810         };
 811
 812         /**
 813          * Get an updated mw.Uri object based on the model state
 814          *
 815          * @return {mw.Uri} Updated Uri
 816          */
 817         mw.rcfilters.Controller.prototype._getUpdatedUri = function () {
 818                 var uri = new mw.Uri();
 819
 820                 // Minimize url
 821                 uri.query = this.uriProcessor.minimizeQuery(
 822                         $.extend(
 823                                 true,
 824                                 {},
 825                                 // We want to retain unrecognized params
 826                                 // The uri params from model will override
 827                                 // any recognized value in the current uri
 828                                 // query, retain unrecognized params, and
 829                                 // the result will then be minimized
 830                                 uri.query,
 831                                 this.uriProcessor.getUriParametersFromModel(),
 832                                 { urlversion: '2' }
 833                         )
 834                 );
 835
 836                 return uri;
 837         };
 838
 839         /**
 840          * Fetch the list of changes from the server for the current filters
 841          *
 842          * @return {jQuery.Promise} Promise object that will resolve with the changes list
 843          *  or with a string denoting no results.
 844          */
 845         mw.rcfilters.Controller.prototype._fetchChangesList = function () {
 846                 var uri = this._getUpdatedUri(),
 847                         requestId = ++this.requestCounter,
 848                         latestRequest = function () {
 849                                 return requestId === this.requestCounter;
 850                         }.bind( this );
 851
 852                 return $.ajax( uri.toString(), { contentType: 'html' } )
 853                         .then(
 854                                 // Success
 855                                 function ( html ) {
 856                                         var $parsed;
 857                                         if ( !latestRequest() ) {
 858                                                 return $.Deferred().reject();
 859                                         }
 860
 861                                         $parsed = $( $.parseHTML( html ) );
 862
 863                                         return {
 864                                                 // Changes list
 865                                                 changes: $parsed.find( '.mw-changeslist' ).first().contents(),
 866                                                 // Fieldset
 867                                                 fieldset: $parsed.find( 'fieldset.rcoptions' ).first()
 868                                         };
 869                                 },
 870                                 // Failure
 871                                 function ( responseObj ) {
 872                                         var $parsed;
 873
 874                                         if ( !latestRequest() ) {
 875                                                 return $.Deferred().reject();
 876                                         }
 877
 878                                         $parsed = $( $.parseHTML( responseObj.responseText ) );
 879
 880                                         // Force a resolve state to this promise
 881                                         return $.Deferred().resolve( {
 882                                                 changes: 'NO_RESULTS',
 883                                                 fieldset: $parsed.find( 'fieldset.rcoptions' ).first()
 884                                         } ).promise();
 885                                 }
 886                         );
 887         };
 888
 889         /**
 890          * Track usage of highlight feature
 891          *
 892          * @param {string} action
 893          * @param {Array|Object|string} filters
 894          */
 895         mw.rcfilters.Controller.prototype._trackHighlight = function ( action, filters ) {
 896                 filters = typeof filters === 'string' ? { name: filters } : filters;
 897                 filters = !Array.isArray( filters ) ? [ filters ] : filters;
 898                 mw.track(
 899                         'event.ChangesListHighlights',
 900                         {
 901                                 action: action,
 902                                 filters: filters,
 903                                 userId: mw.user.getId()
 904                         }
 905                 );
 906         };
 907
 908         /**
 909          * Track filter grouping usage
 910          *
 911          * @param {string} action Action taken
 912          */
 913         mw.rcfilters.Controller.prototype.trackFilterGroupings = function ( action ) {
 914                 var controller = this,
 915                         rightNow = new Date().getTime(),
 916                         randomIdentifier = String( mw.user.sessionId() ) + String( rightNow ) + String( Math.random() ),
 917                         // Get all current filters
 918                         filters = this.filtersModel.getSelectedItems().map( function ( item ) {
 919                                 return item.getName();
 920                         } );
 921
 922                 action = action || 'filtermenu';
 923
 924                 // Check if these filters were the ones we just logged previously
 925                 // (Don't log the same grouping twice, in case the user opens/closes)
 926                 // the menu without action, or with the same result
 927                 if (
 928                         // Only log if the two arrays are different in size
 929                         filters.length !== this.prevLoggedItems.length ||
 930                         // Or if any filters are not the same as the cached filters
 931                         filters.some( function ( filterName ) {
 932                                 return controller.prevLoggedItems.indexOf( filterName ) === -1;
 933                         } ) ||
 934                         // Or if any cached filters are not the same as given filters
 935                         this.prevLoggedItems.some( function ( filterName ) {
 936                                 return filters.indexOf( filterName ) === -1;
 937                         } )
 938                 ) {
 939                         filters.forEach( function ( filterName ) {
 940                                 mw.track(
 941                                         'event.ChangesListFilterGrouping',
 942                                         {
 943                                                 action: action,
 944                                                 groupIdentifier: randomIdentifier,
 945                                                 filter: filterName,
 946                                                 userId: mw.user.getId()
 947                                         }
 948                                 );
 949                         } );
 950
 951                         // Cache the filter names
 952                         this.prevLoggedItems = filters;
 953                 }
 954         };
 955 }( mediaWiki, jQuery ) );