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| 1 | <?php |
| 2 | /** |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2 of the License, or |
| 6 | * (at your option) any later version. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 16 | * http://www.gnu.org/copyleft/gpl.html |
| 17 | * |
| 18 | * @file |
| 19 | */ |
| 20 | |
| 21 | namespace MediaWiki\Pager; |
| 22 | |
| 23 | use HtmlArmor; |
| 24 | use MediaWiki\Context\ContextSource; |
| 25 | use MediaWiki\Context\IContextSource; |
| 26 | use MediaWiki\Html\Html; |
| 27 | use MediaWiki\Linker\LinkRenderer; |
| 28 | use MediaWiki\MediaWikiServices; |
| 29 | use MediaWiki\Navigation\PagerNavigationBuilder; |
| 30 | use MediaWiki\Request\WebRequest; |
| 31 | use stdClass; |
| 32 | use Wikimedia\Rdbms\IReadableDatabase; |
| 33 | use Wikimedia\Rdbms\IResultWrapper; |
| 34 | |
| 35 | /** |
| 36 | * Efficient paging for SQL queries that use a (roughly unique) index. |
| 37 | * |
| 38 | * This is for paging through data sets stored in tables with a unique |
| 39 | * index, instead of a naive "LIMIT offset,limit" clause. |
| 40 | * |
| 41 | * In MySQL, such a limit/offset clause requires counting through the |
| 42 | * specified number of offset rows to find the desired data, which can be |
| 43 | * expensive for large offsets. |
| 44 | * |
| 45 | * ReverseChronologicalPager is a child class of the abstract IndexPager, and |
| 46 | * contains some formatting and display code which is specific to the use of |
| 47 | * timestamps as indexes. Here is a synopsis of its operation: |
| 48 | * |
| 49 | * * The query is specified by the offset, limit and direction (dir) |
| 50 | * parameters, in addition to any subclass-specific parameters. |
| 51 | * * The offset is the non-inclusive start of the DB query. A row with an |
| 52 | * index value equal to the offset will never be shown. |
| 53 | * * The query may either be done backwards, where the rows are returned by |
| 54 | * the database in the opposite order to which they are displayed to the |
| 55 | * user, or forwards. This is specified by the "dir" parameter, dir=prev |
| 56 | * means backwards, anything else means forwards. The offset value |
| 57 | * specifies the start of the database result set, which may be either |
| 58 | * the start or end of the displayed data set. This allows "previous" |
| 59 | * links to be implemented without knowledge of the index value at the |
| 60 | * start of the previous page. |
| 61 | * * An additional row beyond the user-specified limit is always requested. |
| 62 | * This allows us to tell whether we should display a "next" link in the |
| 63 | * case of forwards mode, or a "previous" link in the case of backwards |
| 64 | * mode. Determining whether to display the other link (the one for the |
| 65 | * page before the start of the database result set) can be done |
| 66 | * heuristically by examining the offset. |
| 67 | * |
| 68 | * * An empty offset indicates that the offset condition should be omitted |
| 69 | * from the query. This naturally produces either the first page or the |
| 70 | * last page depending on the dir parameter. |
| 71 | * |
| 72 | * Subclassing the pager to implement concrete functionality should be fairly |
| 73 | * simple, please see the examples in HistoryAction.php and |
| 74 | * SpecialBlockList.php. You just need to override formatRow(), |
| 75 | * getQueryInfo() and getIndexField(). Don't forget to call the parent |
| 76 | * constructor if you override it. |
| 77 | * |
| 78 | * @stable to extend |
| 79 | * @ingroup Pager |
| 80 | */ |
| 81 | abstract class IndexPager extends ContextSource implements Pager { |
| 82 | |
| 83 | /** Backwards-compatible constant for $mDefaultDirection field (do not change) */ |
| 84 | public const DIR_ASCENDING = false; |
| 85 | /** Backwards-compatible constant for $mDefaultDirection field (do not change) */ |
| 86 | public const DIR_DESCENDING = true; |
| 87 | |
| 88 | /** Backwards-compatible constant for reallyDoQuery() (do not change) */ |
| 89 | public const QUERY_ASCENDING = true; |
| 90 | /** Backwards-compatible constant for reallyDoQuery() (do not change) */ |
| 91 | public const QUERY_DESCENDING = false; |
| 92 | |
| 93 | /** @var WebRequest */ |
| 94 | public $mRequest; |
| 95 | /** @var int[] List of default entry limit options to be presented to clients */ |
| 96 | public $mLimitsShown = [ 20, 50, 100, 250, 500 ]; |
| 97 | /** @var int The default entry limit choosen for clients */ |
| 98 | public $mDefaultLimit = 50; |
| 99 | /** @var mixed The starting point to enumerate entries */ |
| 100 | public $mOffset; |
| 101 | /** @var int The maximum number of entries to show */ |
| 102 | public $mLimit; |
| 103 | /** @var bool Whether the listing query completed */ |
| 104 | public $mQueryDone = false; |
| 105 | /** @var IReadableDatabase */ |
| 106 | public $mDb; |
| 107 | /** @var stdClass|bool|null Extra row fetched at the end to see if the end was reached */ |
| 108 | public $mPastTheEndRow; |
| 109 | |
| 110 | /** |
| 111 | * The index to actually be used for ordering. This can be a single column, |
| 112 | * an array of single columns, or an array of arrays of columns. See getIndexField |
| 113 | * for more details. |
| 114 | * @var string|string[] |
| 115 | */ |
| 116 | protected $mIndexField; |
| 117 | /** |
| 118 | * An array of secondary columns to order by. These fields are not part of the offset. |
| 119 | * This is a column list for one ordering, even if multiple orderings are supported. |
| 120 | * @var string[] |
| 121 | */ |
| 122 | protected $mExtraSortFields; |
| 123 | /** For pages that support multiple types of ordering, which one to use. |
| 124 | * @var string|null |
| 125 | */ |
| 126 | protected $mOrderType; |
| 127 | /** |
| 128 | * $mDefaultDirection gives the direction to use when sorting results: |
| 129 | * DIR_ASCENDING or DIR_DESCENDING. If $mIsBackwards is set, we start from |
| 130 | * the opposite end, but we still sort the page itself according to |
| 131 | * $mDefaultDirection. For example, if $mDefaultDirection is DIR_ASCENDING |
| 132 | * but we're going backwards, we'll display the last page of results, but |
| 133 | * the last result will be at the bottom, not the top. |
| 134 | * |
| 135 | * Like $mIndexField, $mDefaultDirection will be a single value even if the |
| 136 | * class supports multiple default directions for different order types. |
| 137 | * @var bool |
| 138 | */ |
| 139 | public $mDefaultDirection; |
| 140 | /** @var bool */ |
| 141 | public $mIsBackwards; |
| 142 | |
| 143 | /** @var bool True if the current result set is the first one */ |
| 144 | public $mIsFirst; |
| 145 | /** @var bool */ |
| 146 | public $mIsLast; |
| 147 | |
| 148 | /** @var array */ |
| 149 | protected $mLastShown; |
| 150 | /** @var array */ |
| 151 | protected $mFirstShown; |
| 152 | /** @var array */ |
| 153 | protected $mPastTheEndIndex; |
| 154 | /** @var array */ |
| 155 | protected $mDefaultQuery; |
| 156 | /** @var string */ |
| 157 | protected $mNavigationBar; |
| 158 | |
| 159 | /** |
| 160 | * Whether to include the offset in the query |
| 161 | * @var bool |
| 162 | */ |
| 163 | protected $mIncludeOffset = false; |
| 164 | |
| 165 | /** |
| 166 | * Result object for the query. Warning: seek before use. |
| 167 | * |
| 168 | * @var IResultWrapper |
| 169 | */ |
| 170 | public $mResult; |
| 171 | |
| 172 | /** @var LinkRenderer */ |
| 173 | private $linkRenderer; |
| 174 | |
| 175 | /** |
| 176 | * @stable to call |
| 177 | * |
| 178 | * @param IContextSource|null $context |
| 179 | * @param LinkRenderer|null $linkRenderer |
| 180 | */ |
| 181 | public function __construct( IContextSource $context = null, LinkRenderer $linkRenderer = null ) { |
| 182 | if ( $context ) { |
| 183 | $this->setContext( $context ); |
| 184 | } |
| 185 | |
| 186 | $this->mRequest = $this->getRequest(); |
| 187 | |
| 188 | # NB: the offset is quoted, not validated. It is treated as an |
| 189 | # arbitrary string to support the widest variety of index types. Be |
| 190 | # careful outputting it into HTML! |
| 191 | $this->mOffset = $this->mRequest->getText( 'offset' ); |
| 192 | |
| 193 | # Use consistent behavior for the limit options |
| 194 | $this->mDefaultLimit = MediaWikiServices::getInstance() |
| 195 | ->getUserOptionsLookup() |
| 196 | ->getIntOption( $this->getUser(), 'rclimit' ); |
| 197 | if ( !$this->mLimit ) { |
| 198 | // Don't override if a subclass calls $this->setLimit() in its constructor. |
| 199 | [ $this->mLimit, /* $offset */ ] = $this->mRequest |
| 200 | ->getLimitOffsetForUser( $this->getUser() ); |
| 201 | } |
| 202 | |
| 203 | $this->mIsBackwards = ( $this->mRequest->getVal( 'dir' ) == 'prev' ); |
| 204 | // Let the subclass set the DB here; otherwise use a replica DB for the current wiki |
| 205 | if ( !$this->mDb ) { |
| 206 | $this->mDb = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase(); |
| 207 | } |
| 208 | |
| 209 | $index = $this->getIndexField(); // column to sort on |
| 210 | $extraSort = $this->getExtraSortFields(); // extra columns to sort on for query planning |
| 211 | $order = $this->mRequest->getVal( 'order' ); |
| 212 | |
| 213 | if ( is_array( $index ) && isset( $index[$order] ) ) { |
| 214 | $this->mOrderType = $order; |
| 215 | $this->mIndexField = $index[$order]; |
| 216 | $this->mExtraSortFields = isset( $extraSort[$order] ) |
| 217 | ? (array)$extraSort[$order] |
| 218 | : []; |
| 219 | } elseif ( is_array( $index ) ) { |
| 220 | # First element is the default |
| 221 | $this->mIndexField = reset( $index ); |
| 222 | $this->mOrderType = key( $index ); |
| 223 | $this->mExtraSortFields = isset( $extraSort[$this->mOrderType] ) |
| 224 | ? (array)$extraSort[$this->mOrderType] |
| 225 | : []; |
| 226 | } else { |
| 227 | # $index is not an array |
| 228 | $this->mOrderType = null; |
| 229 | $this->mIndexField = $index; |
| 230 | $isSortAssociative = array_values( $extraSort ) !== $extraSort; |
| 231 | if ( $isSortAssociative ) { |
| 232 | $this->mExtraSortFields = isset( $extraSort[$index] ) |
| 233 | ? (array)$extraSort[$index] |
| 234 | : []; |
| 235 | } else { |
| 236 | $this->mExtraSortFields = (array)$extraSort; |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | if ( !isset( $this->mDefaultDirection ) ) { |
| 241 | $dir = $this->getDefaultDirections(); |
| 242 | $this->mDefaultDirection = is_array( $dir ) |
| 243 | ? $dir[$this->mOrderType] |
| 244 | : $dir; |
| 245 | } |
| 246 | $this->linkRenderer = $linkRenderer; |
| 247 | } |
| 248 | |
| 249 | /** |
| 250 | * Get the Database object in use |
| 251 | * |
| 252 | * @since 1.20 |
| 253 | * |
| 254 | * @return IReadableDatabase |
| 255 | */ |
| 256 | public function getDatabase() { |
| 257 | return $this->mDb; |
| 258 | } |
| 259 | |
| 260 | /** |
| 261 | * Do the query, using information from the object context. This function |
| 262 | * has been kept minimal to make it overridable if necessary, to allow for |
| 263 | * result sets formed from multiple DB queries. |
| 264 | * |
| 265 | * @stable to override |
| 266 | */ |
| 267 | public function doQuery() { |
| 268 | $defaultOrder = ( $this->mDefaultDirection === self::DIR_ASCENDING ) |
| 269 | ? self::QUERY_ASCENDING |
| 270 | : self::QUERY_DESCENDING; |
| 271 | $order = $this->mIsBackwards ? self::oppositeOrder( $defaultOrder ) : $defaultOrder; |
| 272 | |
| 273 | # Plus an extra row so that we can tell the "next" link should be shown |
| 274 | $queryLimit = $this->mLimit + 1; |
| 275 | if ( $this->mOffset == '' ) { |
| 276 | $isFirst = true; |
| 277 | } else { |
| 278 | // If there's an offset, we may or may not be at the first entry. |
| 279 | // The only way to tell is to run the query in the opposite |
| 280 | // direction see if we get a row. |
| 281 | $oldIncludeOffset = $this->mIncludeOffset; |
| 282 | $this->mIncludeOffset = !$this->mIncludeOffset; |
| 283 | $oppositeOrder = self::oppositeOrder( $order ); |
| 284 | $isFirst = !$this->reallyDoQuery( $this->mOffset, 1, $oppositeOrder )->numRows(); |
| 285 | $this->mIncludeOffset = $oldIncludeOffset; |
| 286 | } |
| 287 | |
| 288 | $this->mResult = $this->reallyDoQuery( |
| 289 | $this->mOffset, |
| 290 | $queryLimit, |
| 291 | $order |
| 292 | ); |
| 293 | |
| 294 | $this->extractResultInfo( $isFirst, $queryLimit, $this->mResult ); |
| 295 | $this->mQueryDone = true; |
| 296 | |
| 297 | $this->preprocessResults( $this->mResult ); |
| 298 | $this->mResult->rewind(); // Paranoia |
| 299 | } |
| 300 | |
| 301 | /** |
| 302 | * @param bool $order One of the IndexPager::QUERY_* class constants |
| 303 | * @return bool The opposite query order as an IndexPager::QUERY_ constant |
| 304 | */ |
| 305 | final protected static function oppositeOrder( $order ) { |
| 306 | return ( $order === self::QUERY_ASCENDING ) |
| 307 | ? self::QUERY_DESCENDING |
| 308 | : self::QUERY_ASCENDING; |
| 309 | } |
| 310 | |
| 311 | /** |
| 312 | * @return IResultWrapper The result wrapper. |
| 313 | */ |
| 314 | public function getResult() { |
| 315 | return $this->mResult; |
| 316 | } |
| 317 | |
| 318 | /** |
| 319 | * @return int The current offset into the result. Valid during formatRow(). |
| 320 | */ |
| 321 | public function getResultOffset() { |
| 322 | return $this->mResult->key(); |
| 323 | } |
| 324 | |
| 325 | /** |
| 326 | * Set the offset from an other source than the request |
| 327 | * |
| 328 | * @param int|string $offset |
| 329 | */ |
| 330 | public function setOffset( $offset ) { |
| 331 | $this->mOffset = $offset; |
| 332 | } |
| 333 | |
| 334 | /** |
| 335 | * Set the limit from an other source than the request |
| 336 | * |
| 337 | * Verifies limit is between 1 and 5000 |
| 338 | * |
| 339 | * @stable to override |
| 340 | * |
| 341 | * @param int|string $limit |
| 342 | */ |
| 343 | public function setLimit( $limit ) { |
| 344 | $limit = (int)$limit; |
| 345 | // WebRequest::getLimitOffsetForUser() puts a cap of 5000, so do same here. |
| 346 | if ( $limit > 5000 ) { |
| 347 | $limit = 5000; |
| 348 | } |
| 349 | if ( $limit > 0 ) { |
| 350 | $this->mLimit = $limit; |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | /** |
| 355 | * Get the current limit |
| 356 | * |
| 357 | * @return int |
| 358 | */ |
| 359 | public function getLimit() { |
| 360 | return $this->mLimit; |
| 361 | } |
| 362 | |
| 363 | /** |
| 364 | * Set whether a row matching exactly the offset should be also included |
| 365 | * in the result or not. By default this is not the case, but when the |
| 366 | * offset is user-supplied this might be wanted. |
| 367 | * |
| 368 | * @param bool $include |
| 369 | */ |
| 370 | public function setIncludeOffset( $include ) { |
| 371 | $this->mIncludeOffset = $include; |
| 372 | } |
| 373 | |
| 374 | /** |
| 375 | * Extract some useful data from the result object for use by |
| 376 | * the navigation bar, put it into $this |
| 377 | * |
| 378 | * @stable to override |
| 379 | * |
| 380 | * @param bool $isFirst False if there are rows before those fetched (i.e. |
| 381 | * if a "previous" link would make sense) |
| 382 | * @param int $limit Exact query limit |
| 383 | * @param IResultWrapper $res |
| 384 | */ |
| 385 | protected function extractResultInfo( $isFirst, $limit, IResultWrapper $res ) { |
| 386 | $numRows = $res->numRows(); |
| 387 | |
| 388 | $firstIndex = []; |
| 389 | $lastIndex = []; |
| 390 | $this->mPastTheEndIndex = []; |
| 391 | $this->mPastTheEndRow = null; |
| 392 | |
| 393 | if ( $numRows ) { |
| 394 | $indexColumns = array_map( static function ( $v ) { |
| 395 | // Remove any table prefix from index field |
| 396 | $parts = explode( '.', $v ); |
| 397 | return end( $parts ); |
| 398 | }, (array)$this->mIndexField ); |
| 399 | |
| 400 | $row = $res->fetchRow(); |
| 401 | foreach ( $indexColumns as $indexColumn ) { |
| 402 | $firstIndex[] = $row[$indexColumn]; |
| 403 | } |
| 404 | |
| 405 | # Discard the extra result row if there is one |
| 406 | if ( $numRows > $this->mLimit && $numRows > 1 ) { |
| 407 | $res->seek( $numRows - 1 ); |
| 408 | $this->mPastTheEndRow = $res->fetchObject(); |
| 409 | foreach ( $indexColumns as $indexColumn ) { |
| 410 | $this->mPastTheEndIndex[] = $this->mPastTheEndRow->$indexColumn; |
| 411 | } |
| 412 | $res->seek( $numRows - 2 ); |
| 413 | $row = $res->fetchRow(); |
| 414 | foreach ( $indexColumns as $indexColumn ) { |
| 415 | $lastIndex[] = $row[$indexColumn]; |
| 416 | } |
| 417 | } else { |
| 418 | $this->mPastTheEndRow = null; |
| 419 | $res->seek( $numRows - 1 ); |
| 420 | $row = $res->fetchRow(); |
| 421 | foreach ( $indexColumns as $indexColumn ) { |
| 422 | $lastIndex[] = $row[$indexColumn]; |
| 423 | } |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | if ( $this->mIsBackwards ) { |
| 428 | $this->mIsFirst = ( $numRows < $limit ); |
| 429 | $this->mIsLast = $isFirst; |
| 430 | $this->mLastShown = $firstIndex; |
| 431 | $this->mFirstShown = $lastIndex; |
| 432 | } else { |
| 433 | $this->mIsFirst = $isFirst; |
| 434 | $this->mIsLast = ( $numRows < $limit ); |
| 435 | $this->mLastShown = $lastIndex; |
| 436 | $this->mFirstShown = $firstIndex; |
| 437 | } |
| 438 | } |
| 439 | |
| 440 | /** |
| 441 | * Get some text to go in brackets in the "function name" part of the SQL comment |
| 442 | * |
| 443 | * @stable to override |
| 444 | * |
| 445 | * @return string |
| 446 | */ |
| 447 | protected function getSqlComment() { |
| 448 | return static::class; |
| 449 | } |
| 450 | |
| 451 | /** |
| 452 | * Do a query with specified parameters, rather than using the object context |
| 453 | * |
| 454 | * @note For b/c, query direction is true for ascending and false for descending |
| 455 | * |
| 456 | * @stable to override |
| 457 | * |
| 458 | * @param string $offset Index offset, inclusive |
| 459 | * @param int $limit Exact query limit |
| 460 | * @param bool $order IndexPager::QUERY_ASCENDING or IndexPager::QUERY_DESCENDING |
| 461 | * @return IResultWrapper |
| 462 | */ |
| 463 | public function reallyDoQuery( $offset, $limit, $order ) { |
| 464 | [ $tables, $fields, $conds, $fname, $options, $join_conds ] = |
| 465 | $this->buildQueryInfo( $offset, $limit, $order ); |
| 466 | |
| 467 | return $this->mDb->select( $tables, $fields, $conds, $fname, $options, $join_conds ); |
| 468 | } |
| 469 | |
| 470 | /** |
| 471 | * Build variables to use by the database wrapper. |
| 472 | * |
| 473 | * @note For b/c, query direction is true for ascending and false for descending |
| 474 | * |
| 475 | * @stable to override |
| 476 | * |
| 477 | * @param int|string|null $offset Index offset, inclusive |
| 478 | * @param int $limit Exact query limit |
| 479 | * @param bool $order IndexPager::QUERY_ASCENDING or IndexPager::QUERY_DESCENDING |
| 480 | * @return array |
| 481 | */ |
| 482 | protected function buildQueryInfo( $offset, $limit, $order ) { |
| 483 | $fname = __METHOD__ . ' (' . $this->getSqlComment() . ')'; |
| 484 | $info = $this->getQueryInfo(); |
| 485 | $tables = $info['tables']; |
| 486 | $fields = $info['fields']; |
| 487 | $conds = $info['conds'] ?? []; |
| 488 | $options = $info['options'] ?? []; |
| 489 | $join_conds = $info['join_conds'] ?? []; |
| 490 | $indexColumns = (array)$this->mIndexField; |
| 491 | $sortColumns = array_merge( $indexColumns, $this->mExtraSortFields ); |
| 492 | |
| 493 | if ( $order === self::QUERY_ASCENDING ) { |
| 494 | $options['ORDER BY'] = $sortColumns; |
| 495 | $operator = $this->mIncludeOffset ? '>=' : '>'; |
| 496 | } else { |
| 497 | $orderBy = []; |
| 498 | foreach ( $sortColumns as $col ) { |
| 499 | $orderBy[] = $col . ' DESC'; |
| 500 | } |
| 501 | $options['ORDER BY'] = $orderBy; |
| 502 | $operator = $this->mIncludeOffset ? '<=' : '<'; |
| 503 | } |
| 504 | if ( $offset ) { |
| 505 | $offsets = explode( '|', $offset, /* Limit to max of indices */ count( $indexColumns ) ); |
| 506 | |
| 507 | $conds[] = $this->buildOffsetConds( |
| 508 | $offsets, |
| 509 | $indexColumns, |
| 510 | $operator |
| 511 | ); |
| 512 | } |
| 513 | $options['LIMIT'] = intval( $limit ); |
| 514 | return [ $tables, $fields, $conds, $fname, $options, $join_conds ]; |
| 515 | } |
| 516 | |
| 517 | /** |
| 518 | * Build the conditions for the offset, given that we may be paginating on a |
| 519 | * single column or multiple columns. Where we paginate on multiple columns, |
| 520 | * the sort order is defined by the order of the columns in $mIndexField. |
| 521 | * |
| 522 | * @param string[] $offsets The offset for each index field |
| 523 | * @param string[] $columns The name of each index field |
| 524 | * @param string $operator Operator for the final part of each inner |
| 525 | * condition. This will be '>' if the query order is ascending, or '<' if |
| 526 | * the query order is descending. If the offset should be included, it will |
| 527 | * also have '=' appended. |
| 528 | * @return string The conditions for getting results from the offset |
| 529 | */ |
| 530 | private function buildOffsetConds( $offsets, $columns, $operator ) { |
| 531 | // $offsets may be shorter than $columns, in which case the remaining columns should be ignored |
| 532 | // (T318080) |
| 533 | $columns = array_slice( $columns, 0, count( $offsets ) ); |
| 534 | $conds = array_combine( $columns, $offsets ); |
| 535 | return $this->mDb->buildComparison( $operator, $conds ); |
| 536 | } |
| 537 | |
| 538 | /** |
| 539 | * Pre-process results; useful for performing batch existence checks, etc. |
| 540 | * |
| 541 | * @stable to override |
| 542 | * |
| 543 | * @param IResultWrapper $result |
| 544 | */ |
| 545 | protected function preprocessResults( $result ) { |
| 546 | } |
| 547 | |
| 548 | /** |
| 549 | * Get the HTML of a pager row. |
| 550 | * |
| 551 | * @stable to override |
| 552 | * @since 1.38 |
| 553 | * @param stdClass $row |
| 554 | * @return string |
| 555 | */ |
| 556 | protected function getRow( $row ): string { |
| 557 | return $this->formatRow( $row ); |
| 558 | } |
| 559 | |
| 560 | /** |
| 561 | * Get the formatted result list. Calls getStartBody(), formatRow() and |
| 562 | * getEndBody(), concatenates the results and returns them. |
| 563 | * |
| 564 | * @stable to override |
| 565 | * |
| 566 | * @return string |
| 567 | */ |
| 568 | public function getBody() { |
| 569 | $this->getOutput()->addModuleStyles( $this->getModuleStyles() ); |
| 570 | if ( !$this->mQueryDone ) { |
| 571 | $this->doQuery(); |
| 572 | } |
| 573 | |
| 574 | if ( $this->mResult->numRows() ) { |
| 575 | # Do any special query batches before display |
| 576 | $this->doBatchLookups(); |
| 577 | } |
| 578 | |
| 579 | # Don't use any extra rows returned by the query |
| 580 | $numRows = min( $this->mResult->numRows(), $this->mLimit ); |
| 581 | |
| 582 | $s = $this->getStartBody(); |
| 583 | if ( $numRows ) { |
| 584 | if ( $this->mIsBackwards ) { |
| 585 | for ( $i = $numRows - 1; $i >= 0; $i-- ) { |
| 586 | $this->mResult->seek( $i ); |
| 587 | $row = $this->mResult->fetchObject(); |
| 588 | $s .= $this->getRow( $row ); |
| 589 | } |
| 590 | } else { |
| 591 | $this->mResult->seek( 0 ); |
| 592 | for ( $i = 0; $i < $numRows; $i++ ) { |
| 593 | $row = $this->mResult->fetchObject(); |
| 594 | $s .= $this->getRow( $row ); |
| 595 | } |
| 596 | } |
| 597 | $s .= $this->getFooter(); |
| 598 | } else { |
| 599 | $s .= $this->getEmptyBody(); |
| 600 | } |
| 601 | $s .= $this->getEndBody(); |
| 602 | return $s; |
| 603 | } |
| 604 | |
| 605 | /** |
| 606 | * ResourceLoader modules that must be loaded to provide correct styling for this pager |
| 607 | * |
| 608 | * @stable to override |
| 609 | * @since 1.38 |
| 610 | * @return string[] |
| 611 | */ |
| 612 | public function getModuleStyles() { |
| 613 | return [ 'mediawiki.pager.styles' ]; |
| 614 | } |
| 615 | |
| 616 | /** |
| 617 | * Classes can extend to output a footer at the bottom of the pager list. |
| 618 | * |
| 619 | * @since 1.38 |
| 620 | * @return string |
| 621 | */ |
| 622 | protected function getFooter(): string { |
| 623 | return ''; |
| 624 | } |
| 625 | |
| 626 | /** |
| 627 | * Make a self-link |
| 628 | * |
| 629 | * @stable to call (since 1.39) |
| 630 | * |
| 631 | * @param string $text Text displayed on the link |
| 632 | * @param array|null $query Associative array of parameter to be in the query string. |
| 633 | * If null, no link is generated. |
| 634 | * @param string|null $type Link type used to create additional attributes, like "rel", "class" or |
| 635 | * "title". Valid values (non-exhaustive list): 'first', 'last', 'prev', 'next', 'asc', 'desc'. |
| 636 | * @return string HTML fragment |
| 637 | */ |
| 638 | protected function makeLink( $text, array $query = null, $type = null ) { |
| 639 | $attrs = []; |
| 640 | if ( $query !== null && in_array( $type, [ 'prev', 'next' ] ) ) { |
| 641 | $attrs['rel'] = $type; |
| 642 | } |
| 643 | |
| 644 | if ( in_array( $type, [ 'asc', 'desc' ] ) ) { |
| 645 | $attrs['title'] = $this->msg( $type == 'asc' ? 'sort-ascending' : 'sort-descending' )->text(); |
| 646 | } |
| 647 | |
| 648 | if ( $type ) { |
| 649 | $attrs['class'] = "mw-{$type}link"; |
| 650 | } |
| 651 | |
| 652 | if ( $query !== null ) { |
| 653 | return $this->getLinkRenderer()->makeKnownLink( |
| 654 | $this->getTitle(), |
| 655 | new HtmlArmor( $text ), |
| 656 | $attrs, |
| 657 | $query + $this->getDefaultQuery() |
| 658 | ); |
| 659 | } else { |
| 660 | return Html::rawElement( 'span', $attrs, $text ); |
| 661 | } |
| 662 | } |
| 663 | |
| 664 | /** |
| 665 | * Called from getBody(), before getStartBody() is called and |
| 666 | * after doQuery() was called. This will be called only if there |
| 667 | * are rows in the result set. |
| 668 | * |
| 669 | * @stable to override |
| 670 | * |
| 671 | * @return void |
| 672 | */ |
| 673 | protected function doBatchLookups() { |
| 674 | } |
| 675 | |
| 676 | /** |
| 677 | * Hook into getBody(), allows text to be inserted at the start. This |
| 678 | * will be called even if there are no rows in the result set. |
| 679 | * |
| 680 | * @return string |
| 681 | */ |
| 682 | protected function getStartBody() { |
| 683 | return ''; |
| 684 | } |
| 685 | |
| 686 | /** |
| 687 | * Hook into getBody() for the end of the list |
| 688 | * |
| 689 | * @stable to override |
| 690 | * |
| 691 | * @return string |
| 692 | */ |
| 693 | protected function getEndBody() { |
| 694 | return ''; |
| 695 | } |
| 696 | |
| 697 | /** |
| 698 | * Hook into getBody(), for the bit between the start and the |
| 699 | * end when there are no rows |
| 700 | * |
| 701 | * @stable to override |
| 702 | * |
| 703 | * @return string |
| 704 | */ |
| 705 | protected function getEmptyBody() { |
| 706 | return ''; |
| 707 | } |
| 708 | |
| 709 | /** |
| 710 | * Get an array of query parameters that should be put into self-links. |
| 711 | * By default, all parameters passed in the URL are used, apart from a |
| 712 | * few exceptions. |
| 713 | * |
| 714 | * @stable to override |
| 715 | * |
| 716 | * @return array Associative array |
| 717 | */ |
| 718 | public function getDefaultQuery() { |
| 719 | if ( !isset( $this->mDefaultQuery ) ) { |
| 720 | $this->mDefaultQuery = $this->getRequest()->getQueryValues(); |
| 721 | unset( $this->mDefaultQuery['title'] ); |
| 722 | unset( $this->mDefaultQuery['dir'] ); |
| 723 | unset( $this->mDefaultQuery['offset'] ); |
| 724 | unset( $this->mDefaultQuery['limit'] ); |
| 725 | unset( $this->mDefaultQuery['order'] ); |
| 726 | unset( $this->mDefaultQuery['month'] ); |
| 727 | unset( $this->mDefaultQuery['year'] ); |
| 728 | } |
| 729 | return $this->mDefaultQuery; |
| 730 | } |
| 731 | |
| 732 | /** |
| 733 | * Get the number of rows in the result set |
| 734 | * |
| 735 | * @return int |
| 736 | */ |
| 737 | public function getNumRows() { |
| 738 | if ( !$this->mQueryDone ) { |
| 739 | $this->doQuery(); |
| 740 | } |
| 741 | return $this->mResult->numRows(); |
| 742 | } |
| 743 | |
| 744 | /** |
| 745 | * Get a URL query array for the prev, next, first and last links. |
| 746 | * |
| 747 | * @stable to override |
| 748 | * |
| 749 | * @return array |
| 750 | */ |
| 751 | public function getPagingQueries() { |
| 752 | if ( !$this->mQueryDone ) { |
| 753 | $this->doQuery(); |
| 754 | } |
| 755 | |
| 756 | # Don't announce the limit everywhere if it's the default |
| 757 | $urlLimit = $this->mLimit == $this->mDefaultLimit ? null : $this->mLimit; |
| 758 | |
| 759 | if ( $this->mIsFirst ) { |
| 760 | $prev = false; |
| 761 | $first = false; |
| 762 | } else { |
| 763 | $prev = [ |
| 764 | 'dir' => 'prev', |
| 765 | 'offset' => implode( '|', (array)$this->mFirstShown ), |
| 766 | 'limit' => $urlLimit |
| 767 | ]; |
| 768 | $first = [ 'offset' => null, 'limit' => $urlLimit ]; |
| 769 | } |
| 770 | if ( $this->mIsLast ) { |
| 771 | $next = false; |
| 772 | $last = false; |
| 773 | } else { |
| 774 | $next = [ 'offset' => implode( '|', (array)$this->mLastShown ), 'limit' => $urlLimit ]; |
| 775 | $last = [ 'dir' => 'prev', 'offset' => null, 'limit' => $urlLimit ]; |
| 776 | } |
| 777 | |
| 778 | return [ |
| 779 | 'prev' => $prev, |
| 780 | 'next' => $next, |
| 781 | 'first' => $first, |
| 782 | 'last' => $last |
| 783 | ]; |
| 784 | } |
| 785 | |
| 786 | /** |
| 787 | * Get the current offset for the URL query parameter. |
| 788 | * |
| 789 | * @stable to override |
| 790 | * @since 1.39 |
| 791 | * @return string |
| 792 | */ |
| 793 | public function getOffsetQuery() { |
| 794 | if ( $this->mIsBackwards ) { |
| 795 | return implode( '|', (array)$this->mPastTheEndIndex ); |
| 796 | } else { |
| 797 | return $this->mOffset; |
| 798 | } |
| 799 | } |
| 800 | |
| 801 | /** |
| 802 | * @stable to override |
| 803 | * @since 1.39 |
| 804 | * @return PagerNavigationBuilder |
| 805 | */ |
| 806 | public function getNavigationBuilder(): PagerNavigationBuilder { |
| 807 | $pagingQueries = $this->getPagingQueries(); |
| 808 | $baseQuery = array_merge( $this->getDefaultQuery(), [ |
| 809 | // These query parameters are all defined here, even though some are null, |
| 810 | // to ensure consistent order of parameters when they're used. |
| 811 | 'dir' => null, |
| 812 | 'offset' => $this->getOffsetQuery(), |
| 813 | 'limit' => null, |
| 814 | ] ); |
| 815 | |
| 816 | $navBuilder = new PagerNavigationBuilder( $this->getContext() ); |
| 817 | $navBuilder |
| 818 | ->setPage( $this->getTitle() ) |
| 819 | ->setLinkQuery( $baseQuery ) |
| 820 | ->setLimits( $this->mLimitsShown ) |
| 821 | ->setLimitLinkQueryParam( 'limit' ) |
| 822 | ->setCurrentLimit( $this->mLimit ) |
| 823 | ->setPrevLinkQuery( $pagingQueries['prev'] ?: null ) |
| 824 | ->setNextLinkQuery( $pagingQueries['next'] ?: null ) |
| 825 | ->setFirstLinkQuery( $pagingQueries['first'] ?: null ) |
| 826 | ->setLastLinkQuery( $pagingQueries['last'] ?: null ); |
| 827 | |
| 828 | return $navBuilder; |
| 829 | } |
| 830 | |
| 831 | /** |
| 832 | * Returns whether to show the "navigation bar" |
| 833 | * @stable to override |
| 834 | * |
| 835 | * @return bool |
| 836 | */ |
| 837 | protected function isNavigationBarShown() { |
| 838 | if ( !$this->mQueryDone ) { |
| 839 | $this->doQuery(); |
| 840 | } |
| 841 | // Hide navigation by default if there is nothing to page |
| 842 | return !( $this->mIsFirst && $this->mIsLast ); |
| 843 | } |
| 844 | |
| 845 | /** |
| 846 | * Returns an HTML string representing the result row $row. |
| 847 | * Rows will be concatenated and returned by getBody() |
| 848 | * |
| 849 | * @param array|stdClass $row Database row |
| 850 | * @return string |
| 851 | */ |
| 852 | abstract public function formatRow( $row ); |
| 853 | |
| 854 | /** |
| 855 | * Provides all parameters needed for the main paged query. It returns |
| 856 | * an associative array with the following elements: |
| 857 | * tables => Table(s) for passing to Database::select() |
| 858 | * fields => Field(s) for passing to Database::select(), may be * |
| 859 | * conds => WHERE conditions |
| 860 | * options => option array |
| 861 | * join_conds => JOIN conditions |
| 862 | * |
| 863 | * @return array |
| 864 | */ |
| 865 | abstract public function getQueryInfo(); |
| 866 | |
| 867 | /** |
| 868 | * Returns the name of the index field. If the pager supports multiple |
| 869 | * orders, it may return an array of 'querykey' => 'indexfield' pairs, |
| 870 | * so that a request with &order=querykey will use indexfield to sort. |
| 871 | * In this case, the first returned key is the default. |
| 872 | * |
| 873 | * Needless to say, it's really not a good idea to use a non-unique index |
| 874 | * for this! That won't page right. |
| 875 | * |
| 876 | * The pager may paginate on multiple fields in combination. If paginating |
| 877 | * on multiple fields, they should be unique in combination (e.g. when |
| 878 | * paginating on user and timestamp, rows may have the same user, rows may |
| 879 | * have the same timestamp, but rows should all have a different combination |
| 880 | * of user and timestamp). |
| 881 | * |
| 882 | * Examples: |
| 883 | * - Always paginate on the user field: |
| 884 | * 'user' |
| 885 | * - Paginate on either the user or the timestamp field (default to user): |
| 886 | * [ |
| 887 | * 'name' => 'user', |
| 888 | * 'time' => 'timestamp', |
| 889 | * ] |
| 890 | * - Always paginate on the combination of user and timestamp: |
| 891 | * [ |
| 892 | * [ 'user', 'timestamp' ] |
| 893 | * ] |
| 894 | * - Paginate on the user then timestamp, or the timestamp then user: |
| 895 | * [ |
| 896 | * 'nametime' => [ 'user', 'timestamp' ], |
| 897 | * 'timename' => [ 'timestamp', 'user' ], |
| 898 | * ] |
| 899 | * |
| 900 | * |
| 901 | * @return string|string[]|array[] |
| 902 | */ |
| 903 | abstract public function getIndexField(); |
| 904 | |
| 905 | /** |
| 906 | * Returns the names of secondary columns to order by in addition to the |
| 907 | * column in getIndexField(). These fields will not be used in the pager |
| 908 | * offset or in any links for users. |
| 909 | * |
| 910 | * If getIndexField() returns an array of 'querykey' => 'indexfield' pairs then |
| 911 | * this must return a corresponding array of 'querykey' => [ fields... ] pairs |
| 912 | * in order for a request with &order=querykey to use [ fields... ] to sort. |
| 913 | * |
| 914 | * If getIndexField() returns a string with the field to sort by, this must either: |
| 915 | * 1 - return an associative array like above, but only the elements for the current |
| 916 | * field will be used. |
| 917 | * 2 - return a non-associative array, for secondary keys to use always. |
| 918 | * |
| 919 | * This is useful for pagers that GROUP BY a unique column (say page_id) |
| 920 | * and ORDER BY another (say page_len). Using GROUP BY and ORDER BY both on |
| 921 | * page_len,page_id avoids temp tables (given a page_len index). This would |
| 922 | * also work if page_id was non-unique but we had a page_len,page_id index. |
| 923 | * |
| 924 | * @stable to override |
| 925 | * |
| 926 | * @return string[]|array[] |
| 927 | */ |
| 928 | protected function getExtraSortFields() { |
| 929 | return []; |
| 930 | } |
| 931 | |
| 932 | /** |
| 933 | * Return the default sorting direction: DIR_ASCENDING or DIR_DESCENDING. |
| 934 | * You can also have an associative array of ordertype => dir, |
| 935 | * if multiple order types are supported. In this case getIndexField() |
| 936 | * must return an array, and the keys of that must exactly match the keys |
| 937 | * of this. |
| 938 | * |
| 939 | * For backward compatibility, this method's return value will be ignored |
| 940 | * if $this->mDefaultDirection is already set when the constructor is |
| 941 | * called, for instance if it's statically initialized. In that case the |
| 942 | * value of that variable (which must be a boolean) will be used. |
| 943 | * |
| 944 | * Note that despite its name, this does not return the value of the |
| 945 | * $this->mDefaultDirection member variable. That's the default for this |
| 946 | * particular instantiation, which is a single value. This is the set of |
| 947 | * all defaults for the class. |
| 948 | * |
| 949 | * @stable to override |
| 950 | * |
| 951 | * @return bool |
| 952 | */ |
| 953 | protected function getDefaultDirections() { |
| 954 | return self::DIR_ASCENDING; |
| 955 | } |
| 956 | |
| 957 | /** |
| 958 | * @since 1.34 |
| 959 | * @return LinkRenderer |
| 960 | */ |
| 961 | protected function getLinkRenderer() { |
| 962 | if ( $this->linkRenderer === null ) { |
| 963 | $this->linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer(); |
| 964 | } |
| 965 | return $this->linkRenderer; |
| 966 | } |
| 967 | } |
| 968 | |
| 969 | /** @deprecated class alias since 1.41 */ |
| 970 | class_alias( IndexPager::class, 'IndexPager' ); |