includes/changes/ChangesListFilter.php

   1 <?php
   2 /**
   3  * Represents a filter (used on ChangesListSpecialPage and descendants)
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @license GPL 2+
  22  * @author Matthew Flaschen
  23  */
  24
  25 /**
  26  * Represents a filter (used on ChangesListSpecialPage and descendants)
  27  *
  28  * @since 1.29
  29  */
  30 abstract class ChangesListFilter {
  31         /**
  32          * Filter name
  33          *
  34          * @var string $name
  35          */
  36         protected $name;
  37
  38         /**
  39          * CSS class suffix used for attribution, e.g. 'bot'.
  40          *
  41          * In this example, if bot actions are included in the result set, this CSS class
  42          * will then be included in all bot-flagged actions.
  43          *
  44          * @var string|null $cssClassSuffix
  45          */
  46         protected $cssClassSuffix;
  47
  48         /**
  49          * Callable that returns true if and only if a row is attributed to this filter
  50          *
  51          * @var callable $isRowApplicableCallable
  52          */
  53         protected $isRowApplicableCallable;
  54
  55         /**
  56          * Group.  ChangesListFilterGroup this belongs to
  57          *
  58          * @var ChangesListFilterGroup $group
  59          */
  60         protected $group;
  61
  62         /**
  63          * i18n key of label for structured UI
  64          *
  65          * @var string $label
  66          */
  67         protected $label;
  68
  69         /**
  70          * i18n key of description for structured UI
  71          *
  72          * @var string $description
  73          */
  74         protected $description;
  75
  76         /**
  77          * Array of associative arrays with conflict information.  See
  78          * setUnidirectionalConflict
  79          *
  80          * @var array $conflictingGroups
  81          */
  82         protected $conflictingGroups = [];
  83
  84         /**
  85          * Array of associative arrays with conflict information.  See
  86          * setUnidirectionalConflict
  87          *
  88          * @var array $conflictingFilters
  89          */
  90         protected $conflictingFilters = [];
  91
  92         /**
  93          * Array of associative arrays with subset information
  94          *
  95          * @var array $subsetFilters
  96          */
  97         protected $subsetFilters = [];
  98
  99         /**
 100          * Priority integer.  Higher value means higher up in the group's filter list.
 101          *
 102          * @var string $priority
 103          */
 104         protected $priority;
 105
 106         const RESERVED_NAME_CHAR = '_';
 107
 108         /**
 109          * Creates a new filter with the specified configuration, and registers it to the
 110          * specified group.
 111          *
 112          * It infers which UI (it can be either or both) to display the filter on based on
 113          * which messages are provided.
 114          *
 115          * If 'label' is provided, it will be displayed on the structured UI.  Thus,
 116          * 'label', 'description', and sub-class parameters are optional depending on which
 117          * UI it's for.
 118          *
 119          * @param array $filterDefinition ChangesListFilter definition
 120          * * $filterDefinition['name'] string Name of filter; use lowercase with no
 121          *     punctuation
 122          * * $filterDefinition['cssClassSuffix'] string CSS class suffix, used to mark
 123          *     that a particular row belongs to this filter (when a row is included by the
 124          *     filter) (optional)
 125          * * $filterDefinition['isRowApplicableCallable'] Callable taking two parameters, the
 126          *     IContextSource, and the RecentChange object for the row, and returning true if
 127          *     the row is attributed to this filter.  The above CSS class will then be
 128          *     automatically added (optional, required if cssClassSuffix is used).
 129          * * $filterDefinition['group'] ChangesListFilterGroup Group.  Filter group this
 130          *     belongs to.
 131          * * $filterDefinition['label'] string i18n key of label for structured UI.
 132          * * $filterDefinition['description'] string i18n key of description for structured
 133          *     UI.
 134          * * $filterDefinition['priority'] int Priority integer.  Higher value means higher
 135          *     up in the group's filter list.
 136          */
 137         public function __construct( array $filterDefinition ) {
 138                 if ( isset( $filterDefinition['group'] ) ) {
 139                         $this->group = $filterDefinition['group'];
 140                 } else {
 141                         throw new MWException( 'You must use \'group\' to specify the ' .
 142                                 'ChangesListFilterGroup this filter belongs to' );
 143                 }
 144
 145                 if ( strpos( $filterDefinition['name'], self::RESERVED_NAME_CHAR ) !== false ) {
 146                         throw new MWException( 'Filter names may not contain \'' .
 147                                 self::RESERVED_NAME_CHAR .
 148                                 '\'.  Use the naming convention: \'lowercase\''
 149                         );
 150                 }
 151
 152                 if ( $this->group->getFilter( $filterDefinition['name'] ) ) {
 153                         throw new MWException( 'Two filters in a group cannot have the ' .
 154                                 "same name: '{$filterDefinition['name']}'" );
 155                 }
 156
 157                 $this->name = $filterDefinition['name'];
 158
 159                 if ( isset( $filterDefinition['cssClassSuffix'] ) ) {
 160                         $this->cssClassSuffix = $filterDefinition['cssClassSuffix'];
 161                         $this->isRowApplicableCallable = $filterDefinition['isRowApplicableCallable'];
 162                 }
 163
 164                 if ( isset( $filterDefinition['label'] ) ) {
 165                         $this->label = $filterDefinition['label'];
 166                         $this->description = $filterDefinition['description'];
 167                 }
 168
 169                 $this->priority = $filterDefinition['priority'];
 170
 171                 $this->group->registerFilter( $this );
 172         }
 173
 174         /**
 175          * Marks that the given ChangesListFilterGroup or ChangesListFilter conflicts with this object.
 176          *
 177          * WARNING: This means there is a conflict when both things are *shown*
 178          * (not filtered out), even for the hide-based filters.  So e.g. conflicting with
 179          * 'hideanons' means there is a conflict if only anonymous users are *shown*.
 180          *
 181          * @param ChangesListFilterGroup|ChangesListFilter $other Other
 182          *  ChangesListFilterGroup or ChangesListFilter
 183          * @param string $globalKey i18n key for top-level conflict message
 184          * @param string $forwardKey i18n key for conflict message in this
 185          *  direction (when in UI context of $this object)
 186          * @param string $backwardKey i18n key for conflict message in reverse
 187          *  direction (when in UI context of $other object)
 188          */
 189         public function conflictsWith( $other, $globalKey, $forwardKey,
 190                 $backwardKey ) {
 191
 192                 if ( $globalKey === null || $forwardKey === null ||
 193                         $backwardKey === null ) {
 194
 195                         throw new MWException( 'All messages must be specified' );
 196                 }
 197
 198                 $this->setUnidirectionalConflict(
 199                         $other,
 200                         $globalKey,
 201                         $forwardKey
 202                 );
 203
 204                 $other->setUnidirectionalConflict(
 205                         $this,
 206                         $globalKey,
 207                         $backwardKey
 208                 );
 209         }
 210
 211         /**
 212          * Marks that the given ChangesListFilterGroup or ChangesListFilter conflicts with
 213          * this object.
 214          *
 215          * Internal use ONLY.
 216          *
 217          * @param ChangesListFilterGroup|ChangesListFilter $other Other
 218          *  ChangesListFilterGroup or ChangesListFilter
 219          * @param string $globalDescription i18n key for top-level conflict message
 220          * @param string $contextDescription i18n key for conflict message in this
 221          *  direction (when in UI context of $this object)
 222          */
 223         public function setUnidirectionalConflict( $other, $globalDescription,
 224                 $contextDescription ) {
 225
 226                 if ( $other instanceof ChangesListFilterGroup ) {
 227                         $this->conflictingGroups[] = [
 228                                 'group' => $other->getName(),
 229                                 'groupObject' => $other,
 230                                 'globalDescription' => $globalDescription,
 231                                 'contextDescription' => $contextDescription,
 232                         ];
 233                 } elseif ( $other instanceof ChangesListFilter ) {
 234                         $this->conflictingFilters[] = [
 235                                 'group' => $other->getGroup()->getName(),
 236                                 'filter' => $other->getName(),
 237                                 'filterObject' => $other,
 238                                 'globalDescription' => $globalDescription,
 239                                 'contextDescription' => $contextDescription,
 240                         ];
 241                 } else {
 242                         throw new MWException( 'You can only pass in a ChangesListFilterGroup or a ChangesListFilter' );
 243                 }
 244         }
 245
 246         /**
 247          * Marks that the current instance is (also) a superset of the filter passed in.
 248          * This can be called more than once.
 249          *
 250          * This means that anything in the results for the other filter is also in the
 251          * results for this one.
 252          *
 253          * @param ChangesListFilter $other The filter the current instance is a superset of
 254          */
 255         public function setAsSupersetOf( ChangesListFilter $other ) {
 256                 if ( $other->getGroup() !== $this->getGroup() ) {
 257                         throw new MWException( 'Supersets can only be defined for filters in the same group' );
 258                 }
 259
 260                 $this->subsetFilters[] = [
 261                         // It's always the same group, but this makes the representation
 262                         // more consistent with conflicts.
 263                         'group' => $other->getGroup()->getName(),
 264                         'filter' => $other->getName(),
 265                 ];
 266         }
 267
 268         /**
 269          * @return string Name, e.g. hideanons
 270          */
 271         public function getName() {
 272                 return $this->name;
 273         }
 274
 275         /**
 276          * @return ChangesListFilterGroup Group this belongs to
 277          */
 278         public function getGroup() {
 279                 return $this->group;
 280         }
 281
 282         /**
 283          * @return string i18n key of label for structured UI
 284          */
 285         public function getLabel() {
 286                 return $this->label;
 287         }
 288
 289         /**
 290          * @return string i18n key of description for structured UI
 291          */
 292         public function getDescription() {
 293                 return $this->description;
 294         }
 295
 296         /**
 297          * Checks whether the filter should display on the unstructured UI
 298          *
 299          * @return bool Whether to display
 300          */
 301         abstract public function displaysOnUnstructuredUi();
 302
 303         /**
 304          * Checks whether the filter should display on the structured UI
 305          * This refers to the exact filter.  See also isFeatureAvailableOnStructuredUi.
 306          *
 307          * @return bool Whether to display
 308          */
 309         public function displaysOnStructuredUi() {
 310                 return $this->label !== null;
 311         }
 312
 313         /**
 314          * Checks whether an equivalent feature for this filter is available on the
 315          * structured UI.
 316          *
 317          * This can either be the exact filter, or a new filter that replaces it.
 318          */
 319         public function isFeatureAvailableOnStructuredUi() {
 320                 return $this->displaysOnStructuredUi();
 321         }
 322
 323         /**
 324          * @return int Priority.  Higher value means higher up in the group list
 325          */
 326         public function getPriority() {
 327                 return $this->priority;
 328         }
 329
 330         /**
 331          * Gets the CSS class
 332          *
 333          * @return string|null CSS class, or null if not defined
 334          */
 335         protected function getCssClass() {
 336                 if ( $this->cssClassSuffix !== null ) {
 337                         return ChangesList::CSS_CLASS_PREFIX . $this->cssClassSuffix;
 338                 } else {
 339                         return null;
 340                 }
 341         }
 342
 343         /**
 344          * Add CSS class if needed
 345          *
 346          * @param IContextSource $ctx Context source
 347          * @param RecentChange $rc Recent changes object
 348          * @param array &$classes Non-associative array of CSS class names; appended to if needed
 349          */
 350         public function applyCssClassIfNeeded( IContextSource $ctx, RecentChange $rc, array &$classes ) {
 351                 if ( $this->isRowApplicableCallable === null ) {
 352                         return;
 353                 }
 354
 355                 if ( call_user_func( $this->isRowApplicableCallable, $ctx, $rc ) ) {
 356                         $classes[] = $this->getCssClass();
 357                 }
 358         }
 359
 360         /**
 361          * Gets the JS data required by the front-end of the structured UI
 362          *
 363          * @return array Associative array Data required by the front-end.  messageKeys is
 364          *  a special top-level value, with the value being an array of the message keys to
 365          *  send to the client.
 366          */
 367         public function getJsData() {
 368                 $output = [
 369                         'name' => $this->getName(),
 370                         'label' => $this->getLabel(),
 371                         'description' => $this->getDescription(),
 372                         'cssClass' => $this->getCssClass(),
 373                         'priority' => $this->priority,
 374                         'subset' => $this->subsetFilters,
 375                         'conflicts' => [],
 376                 ];
 377
 378                 $output['messageKeys'] = [
 379                         $this->getLabel(),
 380                         $this->getDescription(),
 381                 ];
 382
 383                 $conflicts = array_merge(
 384                         $this->conflictingGroups,
 385                         $this->conflictingFilters
 386                 );
 387
 388                 foreach ( $conflicts as $conflictInfo ) {
 389                         unset( $conflictInfo['filterObject'] );
 390                         unset( $conflictInfo['groupObject'] );
 391                         $output['conflicts'][] = $conflictInfo;
 392                         array_push(
 393                                 $output['messageKeys'],
 394                                 $conflictInfo['globalDescription'],
 395                                 $conflictInfo['contextDescription']
 396                         );
 397                 }
 398
 399                 return $output;
 400         }
 401
 402         /**
 403          * Checks whether this filter is selected in the provided options
 404          *
 405          * @param FormOptions $opts
 406          * @return bool
 407          */
 408         abstract public function isSelected( FormOptions $opts );
 409
 410         /**
 411          * Get groups conflicting with this filter
 412          *
 413          * @return ChangesListFilterGroup[]
 414          */
 415         public function getConflictingGroups() {
 416                 return array_map(
 417                         function ( $conflictDesc ) {
 418                                 return $conflictDesc[ 'groupObject' ];
 419                         },
 420                         $this->conflictingGroups
 421                 );
 422         }
 423
 424         /**
 425          * Get filters conflicting with this filter
 426          *
 427          * @return ChangesListFilter[]
 428          */
 429         public function getConflictingFilters() {
 430                 return array_map(
 431                         function ( $conflictDesc ) {
 432                                 return $conflictDesc[ 'filterObject' ];
 433                         },
 434                         $this->conflictingFilters
 435                 );
 436         }
 437
 438         /**
 439          * Check if the conflict with a group is currently "active"
 440          *
 441          * @param ChangesListFilterGroup $group
 442          * @param FormOptions $opts
 443          * @return bool
 444          */
 445         public function activelyInConflictWithGroup( ChangesListFilterGroup $group, FormOptions $opts ) {
 446                 if ( $group->anySelected( $opts ) && $this->isSelected( $opts ) ) {
 447                         /** @var ChangesListFilter $siblingFilter */
 448                         foreach ( $this->getSiblings() as $siblingFilter ) {
 449                                 if ( $siblingFilter->isSelected( $opts ) && !$siblingFilter->hasConflictWithGroup( $group ) ) {
 450                                         return false;
 451                                 }
 452                         }
 453                         return true;
 454                 }
 455                 return false;
 456         }
 457
 458         private function hasConflictWithGroup( ChangesListFilterGroup $group ) {
 459                 return in_array( $group, $this->getConflictingGroups() );
 460         }
 461
 462         /**
 463          * Check if the conflict with a filter is currently "active"
 464          *
 465          * @param ChangesListFilter $filter
 466          * @param FormOptions $opts
 467          * @return bool
 468          */
 469         public function activelyInConflictWithFilter( ChangeslistFilter $filter, FormOptions $opts ) {
 470                 if ( $this->isSelected( $opts ) && $filter->isSelected( $opts ) ) {
 471                         /** @var ChangesListFilter $siblingFilter */
 472                         foreach ( $this->getSiblings() as $siblingFilter ) {
 473                                 if (
 474                                         $siblingFilter->isSelected( $opts ) &&
 475                                         !$siblingFilter->hasConflictWithFilter( $filter )
 476                                 ) {
 477                                         return false;
 478                                 }
 479                         }
 480                         return true;
 481                 }
 482                 return false;
 483         }
 484
 485         private function hasConflictWithFilter( ChangeslistFilter $filter ) {
 486                 return in_array( $filter, $this->getConflictingFilters() );
 487         }
 488
 489         /**
 490          * Get filters in the same group
 491          *
 492          * @return ChangesListFilter[]
 493          */
 494         protected function getSiblings() {
 495                 return array_filter(
 496                         $this->getGroup()->getFilters(),
 497                         function ( $filter ) {
 498                                 return $filter !== $this;
 499                         }
 500                 );
 501         }
 502 }