Update to MediaWiki 1.24.1

5 files changed, 1472 insertions, 0 deletions

diff --git a/includes/pager/AlphabeticPager.php b/includes/pager/AlphabeticPager.php
new file mode 100644
index 00000000..34c78976
--- /dev/null
+++ b/includes/pager/AlphabeticPager.php
@@ -0,0 +1,108 @@
+<?php
+/**
+ * Efficient paging for SQL queries.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Pager
+ */
+
+/**
+ * IndexPager with an alphabetic list and a formatted navigation bar
+ * @ingroup Pager
+ */
+abstract class AlphabeticPager extends IndexPager {
+
+	/**
+	 * Shamelessly stolen bits from ReverseChronologicalPager,
+	 * didn't want to do class magic as may be still revamped
+	 *
+	 * @return string HTML
+	 */
+	function getNavigationBar() {
+		if ( !$this->isNavigationBarShown() ) {
+			return '';
+		}
+
+		if ( isset( $this->mNavigationBar ) ) {
+			return $this->mNavigationBar;
+		}
+
+		$linkTexts = array(
+			'prev' => $this->msg( 'prevn' )->numParams( $this->mLimit )->escaped(),
+			'next' => $this->msg( 'nextn' )->numParams( $this->mLimit )->escaped(),
+			'first' => $this->msg( 'page_first' )->escaped(),
+			'last' => $this->msg( 'page_last' )->escaped()
+		);
+
+		$lang = $this->getLanguage();
+
+		$pagingLinks = $this->getPagingLinks( $linkTexts );
+		$limitLinks = $this->getLimitLinks();
+		$limits = $lang->pipeList( $limitLinks );
+
+		$this->mNavigationBar = $this->msg( 'parentheses' )->rawParams(
+			$lang->pipeList( array( $pagingLinks['first'],
+			$pagingLinks['last'] ) ) )->escaped() . " " .
+			$this->msg( 'viewprevnext' )->rawParams( $pagingLinks['prev'],
+				$pagingLinks['next'], $limits )->escaped();
+
+		if ( !is_array( $this->getIndexField() ) ) {
+			# Early return to avoid undue nesting
+			return $this->mNavigationBar;
+		}
+
+		$extra = '';
+		$first = true;
+		$msgs = $this->getOrderTypeMessages();
+		foreach ( array_keys( $msgs ) as $order ) {
+			if ( $first ) {
+				$first = false;
+			} else {
+				$extra .= $this->msg( 'pipe-separator' )->escaped();
+			}
+
+			if ( $order == $this->mOrderType ) {
+				$extra .= $this->msg( $msgs[$order] )->escaped();
+			} else {
+				$extra .= $this->makeLink(
+					$this->msg( $msgs[$order] )->escaped(),
+					array( 'order' => $order )
+				);
+			}
+		}
+
+		if ( $extra !== '' ) {
+			$extra = ' ' . $this->msg( 'parentheses' )->rawParams( $extra )->escaped();
+			$this->mNavigationBar .= $extra;
+		}
+
+		return $this->mNavigationBar;
+	}
+
+	/**
+	 * If this supports multiple order type messages, give the message key for
+	 * enabling each one in getNavigationBar.  The return type is an associative
+	 * array whose keys must exactly match the keys of the array returned
+	 * by getIndexField(), and whose values are message keys.
+	 *
+	 * @return array
+	 */
+	protected function getOrderTypeMessages() {
+		return null;
+	}
+}
diff --git a/includes/pager/IndexPager.php b/includes/pager/IndexPager.php
new file mode 100644
index 00000000..ce6dc50c
--- /dev/null
+++ b/includes/pager/IndexPager.php
@@ -0,0 +1,742 @@
+<?php
+/**
+ * Efficient paging for SQL queries.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Pager
+ */
+
+/**
+ * IndexPager is an efficient pager which uses a (roughly unique) index in the
+ * data set to implement paging, rather than a "LIMIT offset,limit" clause.
+ * In MySQL, such a limit/offset clause requires counting through the
+ * specified number of offset rows to find the desired data, which can be
+ * expensive for large offsets.
+ *
+ * ReverseChronologicalPager is a child class of the abstract IndexPager, and
+ * contains  some formatting and display code which is specific to the use of
+ * timestamps as  indexes. Here is a synopsis of its operation:
+ *
+ *    * The query is specified by the offset, limit and direction (dir)
+ *      parameters, in addition to any subclass-specific parameters.
+ *    * The offset is the non-inclusive start of the DB query. A row with an
+ *      index value equal to the offset will never be shown.
+ *    * The query may either be done backwards, where the rows are returned by
+ *      the database in the opposite order to which they are displayed to the
+ *      user, or forwards. This is specified by the "dir" parameter, dir=prev
+ *      means backwards, anything else means forwards. The offset value
+ *      specifies the start of the database result set, which may be either
+ *      the start or end of the displayed data set. This allows "previous"
+ *      links to be implemented without knowledge of the index value at the
+ *      start of the previous page.
+ *    * An additional row beyond the user-specified limit is always requested.
+ *      This allows us to tell whether we should display a "next" link in the
+ *      case of forwards mode, or a "previous" link in the case of backwards
+ *      mode. Determining whether to display the other link (the one for the
+ *      page before the start of the database result set) can be done
+ *      heuristically by examining the offset.
+ *
+ *    * An empty offset indicates that the offset condition should be omitted
+ *      from the query. This naturally produces either the first page or the
+ *      last page depending on the dir parameter.
+ *
+ *  Subclassing the pager to implement concrete functionality should be fairly
+ *  simple, please see the examples in HistoryAction.php and
+ *  SpecialBlockList.php. You just need to override formatRow(),
+ *  getQueryInfo() and getIndexField(). Don't forget to call the parent
+ *  constructor if you override it.
+ *
+ * @ingroup Pager
+ */
+abstract class IndexPager extends ContextSource implements Pager {
+	/**
+	 * Constants for the $mDefaultDirection field.
+	 *
+	 * These are boolean for historical reasons and should stay boolean for backwards-compatibility.
+	 */
+	const DIR_ASCENDING = false;
+	const DIR_DESCENDING = true;
+
+	public $mRequest;
+	public $mLimitsShown = array( 20, 50, 100, 250, 500 );
+	public $mDefaultLimit = 50;
+	public $mOffset, $mLimit;
+	public $mQueryDone = false;
+	public $mDb;
+	public $mPastTheEndRow;
+
+	/**
+	 * The index to actually be used for ordering. This is a single column,
+	 * for one ordering, even if multiple orderings are supported.
+	 */
+	protected $mIndexField;
+	/**
+	 * An array of secondary columns to order by. These fields are not part of the offset.
+	 * This is a column list for one ordering, even if multiple orderings are supported.
+	 */
+	protected $mExtraSortFields;
+	/** For pages that support multiple types of ordering, which one to use.
+	 */
+	protected $mOrderType;
+	/**
+	 * $mDefaultDirection gives the direction to use when sorting results:
+	 * DIR_ASCENDING or DIR_DESCENDING.  If $mIsBackwards is set, we
+	 * start from the opposite end, but we still sort the page itself according
+	 * to $mDefaultDirection.  E.g., if $mDefaultDirection is false but we're
+	 * going backwards, we'll display the last page of results, but the last
+	 * result will be at the bottom, not the top.
+	 *
+	 * Like $mIndexField, $mDefaultDirection will be a single value even if the
+	 * class supports multiple default directions for different order types.
+	 */
+	public $mDefaultDirection;
+	public $mIsBackwards;
+
+	/** True if the current result set is the first one */
+	public $mIsFirst;
+	public $mIsLast;
+
+	protected $mLastShown, $mFirstShown, $mPastTheEndIndex, $mDefaultQuery, $mNavigationBar;
+
+	/**
+	 * Whether to include the offset in the query
+	 */
+	protected $mIncludeOffset = false;
+
+	/**
+	 * Result object for the query. Warning: seek before use.
+	 *
+	 * @var ResultWrapper
+	 */
+	public $mResult;
+
+	public function __construct( IContextSource $context = null ) {
+		if ( $context ) {
+			$this->setContext( $context );
+		}
+
+		$this->mRequest = $this->getRequest();
+
+		# NB: the offset is quoted, not validated. It is treated as an
+		# arbitrary string to support the widest variety of index types. Be
+		# careful outputting it into HTML!
+		$this->mOffset = $this->mRequest->getText( 'offset' );
+
+		# Use consistent behavior for the limit options
+		$this->mDefaultLimit = $this->getUser()->getIntOption( 'rclimit' );
+		if ( !$this->mLimit ) {
+			// Don't override if a subclass calls $this->setLimit() in its constructor.
+			list( $this->mLimit, /* $offset */ ) = $this->mRequest->getLimitOffset();
+		}
+
+		$this->mIsBackwards = ( $this->mRequest->getVal( 'dir' ) == 'prev' );
+		# Let the subclass set the DB here; otherwise use a slave DB for the current wiki
+		$this->mDb = $this->mDb ?: wfGetDB( DB_SLAVE );
+
+		$index = $this->getIndexField(); // column to sort on
+		$extraSort = $this->getExtraSortFields(); // extra columns to sort on for query planning
+		$order = $this->mRequest->getVal( 'order' );
+		if ( is_array( $index ) && isset( $index[$order] ) ) {
+			$this->mOrderType = $order;
+			$this->mIndexField = $index[$order];
+			$this->mExtraSortFields = isset( $extraSort[$order] )
+				? (array)$extraSort[$order]
+				: array();
+		} elseif ( is_array( $index ) ) {
+			# First element is the default
+			reset( $index );
+			list( $this->mOrderType, $this->mIndexField ) = each( $index );
+			$this->mExtraSortFields = isset( $extraSort[$this->mOrderType] )
+				? (array)$extraSort[$this->mOrderType]
+				: array();
+		} else {
+			# $index is not an array
+			$this->mOrderType = null;
+			$this->mIndexField = $index;
+			$this->mExtraSortFields = (array)$extraSort;
+		}
+
+		if ( !isset( $this->mDefaultDirection ) ) {
+			$dir = $this->getDefaultDirections();
+			$this->mDefaultDirection = is_array( $dir )
+				? $dir[$this->mOrderType]
+				: $dir;
+		}
+	}
+
+	/**
+	 * Get the Database object in use
+	 *
+	 * @return DatabaseBase
+	 */
+	public function getDatabase() {
+		return $this->mDb;
+	}
+
+	/**
+	 * Do the query, using information from the object context. This function
+	 * has been kept minimal to make it overridable if necessary, to allow for
+	 * result sets formed from multiple DB queries.
+	 */
+	public function doQuery() {
+		# Use the child class name for profiling
+		$fname = __METHOD__ . ' (' . get_class( $this ) . ')';
+		wfProfileIn( $fname );
+
+		// @todo This should probably compare to DIR_DESCENDING and DIR_ASCENDING constants
+		$descending = ( $this->mIsBackwards == $this->mDefaultDirection );
+		# Plus an extra row so that we can tell the "next" link should be shown
+		$queryLimit = $this->mLimit + 1;
+
+		if ( $this->mOffset == '' ) {
+			$isFirst = true;
+		} else {
+			// If there's an offset, we may or may not be at the first entry.
+			// The only way to tell is to run the query in the opposite
+			// direction see if we get a row.
+			$oldIncludeOffset = $this->mIncludeOffset;
+			$this->mIncludeOffset = !$this->mIncludeOffset;
+			$isFirst = !$this->reallyDoQuery( $this->mOffset, 1, !$descending )->numRows();
+			$this->mIncludeOffset = $oldIncludeOffset;
+		}
+
+		$this->mResult = $this->reallyDoQuery(
+			$this->mOffset,
+			$queryLimit,
+			$descending
+		);
+
+		$this->extractResultInfo( $isFirst, $queryLimit, $this->mResult );
+		$this->mQueryDone = true;
+
+		$this->preprocessResults( $this->mResult );
+		$this->mResult->rewind(); // Paranoia
+
+		wfProfileOut( $fname );
+	}
+
+	/**
+	 * @return ResultWrapper The result wrapper.
+	 */
+	function getResult() {
+		return $this->mResult;
+	}
+
+	/**
+	 * Set the offset from an other source than the request
+	 *
+	 * @param int|string $offset
+	 */
+	function setOffset( $offset ) {
+		$this->mOffset = $offset;
+	}
+
+	/**
+	 * Set the limit from an other source than the request
+	 *
+	 * Verifies limit is between 1 and 5000
+	 *
+	 * @param int|string $limit
+	 */
+	function setLimit( $limit ) {
+		$limit = (int)$limit;
+		// WebRequest::getLimitOffset() puts a cap of 5000, so do same here.
+		if ( $limit > 5000 ) {
+			$limit = 5000;
+		}
+		if ( $limit > 0 ) {
+			$this->mLimit = $limit;
+		}
+	}
+
+	/**
+	 * Get the current limit
+	 *
+	 * @return int
+	 */
+	function getLimit() {
+		return $this->mLimit;
+	}
+
+	/**
+	 * Set whether a row matching exactly the offset should be also included
+	 * in the result or not. By default this is not the case, but when the
+	 * offset is user-supplied this might be wanted.
+	 *
+	 * @param bool $include
+	 */
+	public function setIncludeOffset( $include ) {
+		$this->mIncludeOffset = $include;
+	}
+
+	/**
+	 * Extract some useful data from the result object for use by
+	 * the navigation bar, put it into $this
+	 *
+	 * @param bool $isFirst False if there are rows before those fetched (i.e.
+	 *     if a "previous" link would make sense)
+	 * @param int $limit Exact query limit
+	 * @param ResultWrapper $res
+	 */
+	function extractResultInfo( $isFirst, $limit, ResultWrapper $res ) {
+		$numRows = $res->numRows();
+		if ( $numRows ) {
+			# Remove any table prefix from index field
+			$parts = explode( '.', $this->mIndexField );
+			$indexColumn = end( $parts );
+
+			$row = $res->fetchRow();
+			$firstIndex = $row[$indexColumn];
+
+			# Discard the extra result row if there is one
+			if ( $numRows > $this->mLimit && $numRows > 1 ) {
+				$res->seek( $numRows - 1 );
+				$this->mPastTheEndRow = $res->fetchObject();
+				$this->mPastTheEndIndex = $this->mPastTheEndRow->$indexColumn;
+				$res->seek( $numRows - 2 );
+				$row = $res->fetchRow();
+				$lastIndex = $row[$indexColumn];
+			} else {
+				$this->mPastTheEndRow = null;
+				# Setting indexes to an empty string means that they will be
+				# omitted if they would otherwise appear in URLs. It just so
+				# happens that this  is the right thing to do in the standard
+				# UI, in all the relevant cases.
+				$this->mPastTheEndIndex = '';
+				$res->seek( $numRows - 1 );
+				$row = $res->fetchRow();
+				$lastIndex = $row[$indexColumn];
+			}
+		} else {
+			$firstIndex = '';
+			$lastIndex = '';
+			$this->mPastTheEndRow = null;
+			$this->mPastTheEndIndex = '';
+		}
+
+		if ( $this->mIsBackwards ) {
+			$this->mIsFirst = ( $numRows < $limit );
+			$this->mIsLast = $isFirst;
+			$this->mLastShown = $firstIndex;
+			$this->mFirstShown = $lastIndex;
+		} else {
+			$this->mIsFirst = $isFirst;
+			$this->mIsLast = ( $numRows < $limit );
+			$this->mLastShown = $lastIndex;
+			$this->mFirstShown = $firstIndex;
+		}
+	}
+
+	/**
+	 * Get some text to go in brackets in the "function name" part of the SQL comment
+	 *
+	 * @return string
+	 */
+	function getSqlComment() {
+		return get_class( $this );
+	}
+
+	/**
+	 * Do a query with specified parameters, rather than using the object
+	 * context
+	 *
+	 * @param string $offset Index offset, inclusive
+	 * @param int $limit Exact query limit
+	 * @param bool $descending Query direction, false for ascending, true for descending
+	 * @return ResultWrapper
+	 */
+	public function reallyDoQuery( $offset, $limit, $descending ) {
+		list( $tables, $fields, $conds, $fname, $options, $join_conds ) =
+			$this->buildQueryInfo( $offset, $limit, $descending );
+
+		return $this->mDb->select( $tables, $fields, $conds, $fname, $options, $join_conds );
+	}
+
+	/**
+	 * Build variables to use by the database wrapper.
+	 *
+	 * @param string $offset Index offset, inclusive
+	 * @param int $limit Exact query limit
+	 * @param bool $descending Query direction, false for ascending, true for descending
+	 * @return array
+	 */
+	protected function buildQueryInfo( $offset, $limit, $descending ) {
+		$fname = __METHOD__ . ' (' . $this->getSqlComment() . ')';
+		$info = $this->getQueryInfo();
+		$tables = $info['tables'];
+		$fields = $info['fields'];
+		$conds = isset( $info['conds'] ) ? $info['conds'] : array();
+		$options = isset( $info['options'] ) ? $info['options'] : array();
+		$join_conds = isset( $info['join_conds'] ) ? $info['join_conds'] : array();
+		$sortColumns = array_merge( array( $this->mIndexField ), $this->mExtraSortFields );
+		if ( $descending ) {
+			$options['ORDER BY'] = $sortColumns;
+			$operator = $this->mIncludeOffset ? '>=' : '>';
+		} else {
+			$orderBy = array();
+			foreach ( $sortColumns as $col ) {
+				$orderBy[] = $col . ' DESC';
+			}
+			$options['ORDER BY'] = $orderBy;
+			$operator = $this->mIncludeOffset ? '<=' : '<';
+		}
+		if ( $offset != '' ) {
+			$conds[] = $this->mIndexField . $operator . $this->mDb->addQuotes( $offset );
+		}
+		$options['LIMIT'] = intval( $limit );
+		return array( $tables, $fields, $conds, $fname, $options, $join_conds );
+	}
+
+	/**
+	 * Pre-process results; useful for performing batch existence checks, etc.
+	 *
+	 * @param ResultWrapper $result
+	 */
+	protected function preprocessResults( $result ) {
+	}
+
+	/**
+	 * Get the formatted result list. Calls getStartBody(), formatRow() and
+	 * getEndBody(), concatenates the results and returns them.
+	 *
+	 * @return string
+	 */
+	public function getBody() {
+		if ( !$this->mQueryDone ) {
+			$this->doQuery();
+		}
+
+		if ( $this->mResult->numRows() ) {
+			# Do any special query batches before display
+			$this->doBatchLookups();
+		}
+
+		# Don't use any extra rows returned by the query
+		$numRows = min( $this->mResult->numRows(), $this->mLimit );
+
+		$s = $this->getStartBody();
+		if ( $numRows ) {
+			if ( $this->mIsBackwards ) {
+				for ( $i = $numRows - 1; $i >= 0; $i-- ) {
+					$this->mResult->seek( $i );
+					$row = $this->mResult->fetchObject();
+					$s .= $this->formatRow( $row );
+				}
+			} else {
+				$this->mResult->seek( 0 );
+				for ( $i = 0; $i < $numRows; $i++ ) {
+					$row = $this->mResult->fetchObject();
+					$s .= $this->formatRow( $row );
+				}
+			}
+		} else {
+			$s .= $this->getEmptyBody();
+		}
+		$s .= $this->getEndBody();
+		return $s;
+	}
+
+	/**
+	 * Make a self-link
+	 *
+	 * @param string $text Text displayed on the link
+	 * @param array $query Associative array of parameter to be in the query string
+	 * @param string $type Link type used to create additional attributes, like "rel", "class" or
+	 *  "title". Valid values (non-exhaustive list): 'first', 'last', 'prev', 'next', 'asc', 'desc'.
+	 * @return string HTML fragment
+	 */
+	function makeLink( $text, array $query = null, $type = null ) {
+		if ( $query === null ) {
+			return $text;
+		}
+
+		$attrs = array();
+		if ( in_array( $type, array( 'prev', 'next' ) ) ) {
+			$attrs['rel'] = $type;
+		}
+
+		if ( in_array( $type, array( 'asc', 'desc' ) ) ) {
+			$attrs['title'] = wfMessage( $type == 'asc' ? 'sort-ascending' : 'sort-descending' )->text();
+		}
+
+		if ( $type ) {
+			$attrs['class'] = "mw-{$type}link";
+		}
+
+
+		return Linker::linkKnown(
+			$this->getTitle(),
+			$text,
+			$attrs,
+			$query + $this->getDefaultQuery()
+		);
+	}
+
+	/**
+	 * Called from getBody(), before getStartBody() is called and
+	 * after doQuery() was called. This will be called only if there
+	 * are rows in the result set.
+	 *
+	 * @return void
+	 */
+	protected function doBatchLookups() {
+	}
+
+	/**
+	 * Hook into getBody(), allows text to be inserted at the start. This
+	 * will be called even if there are no rows in the result set.
+	 *
+	 * @return string
+	 */
+	protected function getStartBody() {
+		return '';
+	}
+
+	/**
+	 * Hook into getBody() for the end of the list
+	 *
+	 * @return string
+	 */
+	protected function getEndBody() {
+		return '';
+	}
+
+	/**
+	 * Hook into getBody(), for the bit between the start and the
+	 * end when there are no rows
+	 *
+	 * @return string
+	 */
+	protected function getEmptyBody() {
+		return '';
+	}
+
+	/**
+	 * Get an array of query parameters that should be put into self-links.
+	 * By default, all parameters passed in the URL are used, except for a
+	 * short blacklist.
+	 *
+	 * @return array Associative array
+	 */
+	function getDefaultQuery() {
+		if ( !isset( $this->mDefaultQuery ) ) {
+			$this->mDefaultQuery = $this->getRequest()->getQueryValues();
+			unset( $this->mDefaultQuery['title'] );
+			unset( $this->mDefaultQuery['dir'] );
+			unset( $this->mDefaultQuery['offset'] );
+			unset( $this->mDefaultQuery['limit'] );
+			unset( $this->mDefaultQuery['order'] );
+			unset( $this->mDefaultQuery['month'] );
+			unset( $this->mDefaultQuery['year'] );
+		}
+		return $this->mDefaultQuery;
+	}
+
+	/**
+	 * Get the number of rows in the result set
+	 *
+	 * @return int
+	 */
+	function getNumRows() {
+		if ( !$this->mQueryDone ) {
+			$this->doQuery();
+		}
+		return $this->mResult->numRows();
+	}
+
+	/**
+	 * Get a URL query array for the prev, next, first and last links.
+	 *
+	 * @return array
+	 */
+	function getPagingQueries() {
+		if ( !$this->mQueryDone ) {
+			$this->doQuery();
+		}
+
+		# Don't announce the limit everywhere if it's the default
+		$urlLimit = $this->mLimit == $this->mDefaultLimit ? null : $this->mLimit;
+
+		if ( $this->mIsFirst ) {
+			$prev = false;
+			$first = false;
+		} else {
+			$prev = array(
+				'dir' => 'prev',
+				'offset' => $this->mFirstShown,
+				'limit' => $urlLimit
+			);
+			$first = array( 'limit' => $urlLimit );
+		}
+		if ( $this->mIsLast ) {
+			$next = false;
+			$last = false;
+		} else {
+			$next = array( 'offset' => $this->mLastShown, 'limit' => $urlLimit );
+			$last = array( 'dir' => 'prev', 'limit' => $urlLimit );
+		}
+		return array(
+			'prev' => $prev,
+			'next' => $next,
+			'first' => $first,
+			'last' => $last
+		);
+	}
+
+	/**
+	 * Returns whether to show the "navigation bar"
+	 *
+	 * @return bool
+	 */
+	function isNavigationBarShown() {
+		if ( !$this->mQueryDone ) {
+			$this->doQuery();
+		}
+		// Hide navigation by default if there is nothing to page
+		return !( $this->mIsFirst && $this->mIsLast );
+	}
+
+	/**
+	 * Get paging links. If a link is disabled, the item from $disabledTexts
+	 * will be used. If there is no such item, the unlinked text from
+	 * $linkTexts will be used. Both $linkTexts and $disabledTexts are arrays
+	 * of HTML.
+	 *
+	 * @param array $linkTexts
+	 * @param array $disabledTexts
+	 * @return array
+	 */
+	function getPagingLinks( $linkTexts, $disabledTexts = array() ) {
+		$queries = $this->getPagingQueries();
+		$links = array();
+
+		foreach ( $queries as $type => $query ) {
+			if ( $query !== false ) {
+				$links[$type] = $this->makeLink(
+					$linkTexts[$type],
+					$queries[$type],
+					$type
+				);
+			} elseif ( isset( $disabledTexts[$type] ) ) {
+				$links[$type] = $disabledTexts[$type];
+			} else {
+				$links[$type] = $linkTexts[$type];
+			}
+		}
+
+		return $links;
+	}
+
+	function getLimitLinks() {
+		$links = array();
+		if ( $this->mIsBackwards ) {
+			$offset = $this->mPastTheEndIndex;
+		} else {
+			$offset = $this->mOffset;
+		}
+		foreach ( $this->mLimitsShown as $limit ) {
+			$links[] = $this->makeLink(
+				$this->getLanguage()->formatNum( $limit ),
+				array( 'offset' => $offset, 'limit' => $limit ),
+				'num'
+			);
+		}
+		return $links;
+	}
+
+	/**
+	 * Abstract formatting function. This should return an HTML string
+	 * representing the result row $row. Rows will be concatenated and
+	 * returned by getBody()
+	 *
+	 * @param array|stdClass $row Database row
+	 * @return string
+	 */
+	abstract function formatRow( $row );
+
+	/**
+	 * This function should be overridden to provide all parameters
+	 * needed for the main paged query. It returns an associative
+	 * array with the following elements:
+	 *    tables => Table(s) for passing to Database::select()
+	 *    fields => Field(s) for passing to Database::select(), may be *
+	 *    conds => WHERE conditions
+	 *    options => option array
+	 *    join_conds => JOIN conditions
+	 *
+	 * @return array
+	 */
+	abstract function getQueryInfo();
+
+	/**
+	 * This function should be overridden to return the name of the index fi-
+	 * eld.  If the pager supports multiple orders, it may return an array of
+	 * 'querykey' => 'indexfield' pairs, so that a request with &count=querykey
+	 * will use indexfield to sort.  In this case, the first returned key is
+	 * the default.
+	 *
+	 * Needless to say, it's really not a good idea to use a non-unique index
+	 * for this!  That won't page right.
+	 *
+	 * @return string|array
+	 */
+	abstract function getIndexField();
+
+	/**
+	 * This function should be overridden to return the names of secondary columns
+	 * to order by in addition to the column in getIndexField(). These fields will
+	 * not be used in the pager offset or in any links for users.
+	 *
+	 * If getIndexField() returns an array of 'querykey' => 'indexfield' pairs then
+	 * this must return a corresponding array of 'querykey' => array( fields...) pairs
+	 * in order for a request with &count=querykey to use array( fields...) to sort.
+	 *
+	 * This is useful for pagers that GROUP BY a unique column (say page_id)
+	 * and ORDER BY another (say page_len). Using GROUP BY and ORDER BY both on
+	 * page_len,page_id avoids temp tables (given a page_len index). This would
+	 * also work if page_id was non-unique but we had a page_len,page_id index.
+	 *
+	 * @return array
+	 */
+	protected function getExtraSortFields() {
+		return array();
+	}
+
+	/**
+	 * Return the default sorting direction: DIR_ASCENDING or DIR_DESCENDING.
+	 * You can also have an associative array of ordertype => dir,
+	 * if multiple order types are supported.  In this case getIndexField()
+	 * must return an array, and the keys of that must exactly match the keys
+	 * of this.
+	 *
+	 * For backward compatibility, this method's return value will be ignored
+	 * if $this->mDefaultDirection is already set when the constructor is
+	 * called, for instance if it's statically initialized.  In that case the
+	 * value of that variable (which must be a boolean) will be used.
+	 *
+	 * Note that despite its name, this does not return the value of the
+	 * $this->mDefaultDirection member variable.  That's the default for this
+	 * particular instantiation, which is a single value.  This is the set of
+	 * all defaults for the class.
+	 *
+	 * @return bool
+	 */
+	protected function getDefaultDirections() {
+		return IndexPager::DIR_ASCENDING;
+	}
+}
diff --git a/includes/pager/Pager.php b/includes/pager/Pager.php
new file mode 100644
index 00000000..edec490c
--- /dev/null
+++ b/includes/pager/Pager.php
@@ -0,0 +1,35 @@
+<?php
+/**
+ * Efficient paging for SQL queries.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Pager
+ */
+
+/**
+ * @defgroup Pager Pager
+ */
+
+/**
+ * Basic pager interface.
+ * @ingroup Pager
+ */
+interface Pager {
+	function getNavigationBar();
+	function getBody();
+}
diff --git a/includes/pager/ReverseChronologicalPager.php b/includes/pager/ReverseChronologicalPager.php
new file mode 100644
index 00000000..4f8c438d
--- /dev/null
+++ b/includes/pager/ReverseChronologicalPager.php
@@ -0,0 +1,118 @@
+<?php
+/**
+ * Efficient paging for SQL queries.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Pager
+ */
+
+/**
+ * IndexPager with a formatted navigation bar
+ * @ingroup Pager
+ */
+abstract class ReverseChronologicalPager extends IndexPager {
+	public $mDefaultDirection = IndexPager::DIR_DESCENDING;
+	public $mYear;
+	public $mMonth;
+
+	function getNavigationBar() {
+		if ( !$this->isNavigationBarShown() ) {
+			return '';
+		}
+
+		if ( isset( $this->mNavigationBar ) ) {
+			return $this->mNavigationBar;
+		}
+
+		$linkTexts = array(
+			'prev' => $this->msg( 'pager-newer-n' )->numParams( $this->mLimit )->escaped(),
+			'next' => $this->msg( 'pager-older-n' )->numParams( $this->mLimit )->escaped(),
+			'first' => $this->msg( 'histlast' )->escaped(),
+			'last' => $this->msg( 'histfirst' )->escaped()
+		);
+
+		$pagingLinks = $this->getPagingLinks( $linkTexts );
+		$limitLinks = $this->getLimitLinks();
+		$limits = $this->getLanguage()->pipeList( $limitLinks );
+		$firstLastLinks = $this->msg( 'parentheses' )->rawParams( "{$pagingLinks['first']}" .
+			$this->msg( 'pipe-separator' )->escaped() .
+			"{$pagingLinks['last']}" )->escaped();
+
+		$this->mNavigationBar = $firstLastLinks . ' ' .
+			$this->msg( 'viewprevnext' )->rawParams(
+				$pagingLinks['prev'], $pagingLinks['next'], $limits )->escaped();
+
+		return $this->mNavigationBar;
+	}
+
+	function getDateCond( $year, $month ) {
+		$year = intval( $year );
+		$month = intval( $month );
+
+		// Basic validity checks
+		$this->mYear = $year > 0 ? $year : false;
+		$this->mMonth = ( $month > 0 && $month < 13 ) ? $month : false;
+
+		// Given an optional year and month, we need to generate a timestamp
+		// to use as "WHERE rev_timestamp <= result"
+		// Examples: year = 2006 equals < 20070101 (+000000)
+		// year=2005, month=1    equals < 20050201
+		// year=2005, month=12   equals < 20060101
+		if ( !$this->mYear && !$this->mMonth ) {
+			return;
+		}
+
+		if ( $this->mYear ) {
+			$year = $this->mYear;
+		} else {
+			// If no year given, assume the current one
+			$timestamp = MWTimestamp::getInstance();
+			$year = $timestamp->format( 'Y' );
+			// If this month hasn't happened yet this year, go back to last year's month
+			if ( $this->mMonth > $timestamp->format( 'n' ) ) {
+				$year--;
+			}
+		}
+
+		if ( $this->mMonth ) {
+			$month = $this->mMonth + 1;
+			// For December, we want January 1 of the next year
+			if ( $month > 12 ) {
+				$month = 1;
+				$year++;
+			}
+		} else {
+			// No month implies we want up to the end of the year in question
+			$month = 1;
+			$year++;
+		}
+
+		// Y2K38 bug
+		if ( $year > 2032 ) {
+			$year = 2032;
+		}
+
+		$ymd = (int)sprintf( "%04d%02d01", $year, $month );
+
+		if ( $ymd > 20320101 ) {
+			$ymd = 20320101;
+		}
+
+		$this->mOffset = $this->mDb->timestamp( "${ymd}000000" );
+	}
+}
diff --git a/includes/pager/TablePager.php b/includes/pager/TablePager.php
new file mode 100644
index 00000000..80955398
--- /dev/null
+++ b/includes/pager/TablePager.php
@@ -0,0 +1,469 @@
+<?php
+/**
+ * Efficient paging for SQL queries.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Pager
+ */
+
+/**
+ * Table-based display with a user-selectable sort order
+ * @ingroup Pager
+ */
+abstract class TablePager extends IndexPager {
+	protected $mSort;
+
+	protected $mCurrentRow;
+
+	public function __construct( IContextSource $context = null ) {
+		if ( $context ) {
+			$this->setContext( $context );
+		}
+
+		$this->mSort = $this->getRequest()->getText( 'sort' );
+		if ( !array_key_exists( $this->mSort, $this->getFieldNames() )
+			|| !$this->isFieldSortable( $this->mSort )
+		) {
+			$this->mSort = $this->getDefaultSort();
+		}
+		if ( $this->getRequest()->getBool( 'asc' ) ) {
+			$this->mDefaultDirection = IndexPager::DIR_ASCENDING;
+		} elseif ( $this->getRequest()->getBool( 'desc' ) ) {
+			$this->mDefaultDirection = IndexPager::DIR_DESCENDING;
+		} /* Else leave it at whatever the class default is */
+
+		parent::__construct();
+	}
+
+	/**
+	 * Get the formatted result list. Calls getStartBody(), formatRow() and getEndBody(), concatenates
+	 * the results and returns them.
+	 *
+	 * Also adds the required styles to our OutputPage object (this means that if context wasn't
+	 * passed to constructor or otherwise set up, you will get a pager with missing styles).
+	 *
+	 * This method has been made 'final' in 1.24. There's no reason to override it, and if there exist
+	 * any subclasses that do, the style loading hack is probably broken in them. Let's fail fast
+	 * rather than mysteriously render things wrong.
+	 *
+	 * @deprecated since 1.24, use getBodyOutput() or getFullOutput() instead
+	 * @return string
+	 */
+	final public function getBody() {
+		$this->getOutput()->addModuleStyles( $this->getModuleStyles() );
+		return parent::getBody();
+	}
+
+	/**
+	 * Get the formatted result list.
+	 *
+	 * Calls getBody() and getModuleStyles() and builds a ParserOutput object. (This is a bit hacky
+	 * but works well.)
+	 *
+	 * @since 1.24
+	 * @return ParserOutput
+	 */
+	public function getBodyOutput() {
+		$body = parent::getBody();
+
+		$pout = new ParserOutput;
+		$pout->setText( $body );
+		$pout->addModuleStyles( $this->getModuleStyles() );
+		return $pout;
+	}
+
+	/**
+	 * Get the formatted result list, with navigation bars.
+	 *
+	 * Calls getBody(), getNavigationBar() and getModuleStyles() and
+	 * builds a ParserOutput object. (This is a bit hacky but works well.)
+	 *
+	 * @since 1.24
+	 * @return ParserOutput
+	 */
+	public function getFullOutput() {
+		$navigation = $this->getNavigationBar();
+		$body = parent::getBody();
+
+		$pout = new ParserOutput;
+		$pout->setText( $navigation . $body . $navigation );
+		$pout->addModuleStyles( $this->getModuleStyles() );
+		return $pout;
+	}
+
+	/**
+	 * @protected
+	 * @return string
+	 */
+	function getStartBody() {
+		$sortClass = $this->getSortHeaderClass();
+
+		$s = '';
+		$fields = $this->getFieldNames();
+
+		// Make table header
+		foreach ( $fields as $field => $name ) {
+			if ( strval( $name ) == '' ) {
+				$s .= Html::rawElement( 'th', array(), '&#160;' ) . "\n";
+			} elseif ( $this->isFieldSortable( $field ) ) {
+				$query = array( 'sort' => $field, 'limit' => $this->mLimit );
+				$linkType = null;
+				$class = null;
+
+				if ( $this->mSort == $field ) {
+					// The table is sorted by this field already, make a link to sort in the other direction
+					// We don't actually know in which direction other fields will be sorted by default…
+					if ( $this->mDefaultDirection == IndexPager::DIR_DESCENDING ) {
+						$linkType = 'asc';
+						$class = "$sortClass TablePager_sort-descending";
+						$query['asc'] = '1';
+						$query['desc'] = '';
+					} else {
+						$linkType = 'desc';
+						$class = "$sortClass TablePager_sort-ascending";
+						$query['asc'] = '';
+						$query['desc'] = '1';
+					}
+				}
+
+				$link = $this->makeLink( htmlspecialchars( $name ), $query, $linkType );
+				$s .= Html::rawElement( 'th', array( 'class' => $class ), $link ) . "\n";
+			} else {
+				$s .= Html::element( 'th', array(), $name ) . "\n";
+			}
+		}
+
+		$tableClass = $this->getTableClass();
+		$ret = Html::openElement( 'table', array(
+			'class' => "mw-datatable $tableClass" )
+		);
+		$ret .= Html::rawElement( 'thead', array(), Html::rawElement( 'tr', array(), "\n" . $s . "\n" ) );
+		$ret .= Html::openElement( 'tbody' ) . "\n";
+
+		return $ret;
+	}
+
+	/**
+	 * @protected
+	 * @return string
+	 */
+	function getEndBody() {
+		return "</tbody></table>\n";
+	}
+
+	/**
+	 * @protected
+	 * @return string
+	 */
+	function getEmptyBody() {
+		$colspan = count( $this->getFieldNames() );
+		$msgEmpty = $this->msg( 'table_pager_empty' )->text();
+		return Html::rawElement( 'tr', array(),
+			Html::element( 'td', array( 'colspan' => $colspan ), $msgEmpty ) );
+	}
+
+	/**
+	 * @protected
+	 * @param stdClass $row
+	 * @return string HTML
+	 */
+	function formatRow( $row ) {
+		$this->mCurrentRow = $row; // In case formatValue etc need to know
+		$s = Html::openElement( 'tr', $this->getRowAttrs( $row ) ) . "\n";
+		$fieldNames = $this->getFieldNames();
+
+		foreach ( $fieldNames as $field => $name ) {
+			$value = isset( $row->$field ) ? $row->$field : null;
+			$formatted = strval( $this->formatValue( $field, $value ) );
+
+			if ( $formatted == '' ) {
+				$formatted = '&#160;';
+			}
+
+			$s .= Html::rawElement( 'td', $this->getCellAttrs( $field, $value ), $formatted ) . "\n";
+		}
+
+		$s .= Html::closeElement( 'tr' ) . "\n";
+
+		return $s;
+	}
+
+	/**
+	 * Get a class name to be applied to the given row.
+	 *
+	 * @protected
+	 *
+	 * @param object $row The database result row
+	 * @return string
+	 */
+	function getRowClass( $row ) {
+		return '';
+	}
+
+	/**
+	 * Get attributes to be applied to the given row.
+	 *
+	 * @protected
+	 *
+	 * @param object $row The database result row
+	 * @return array Array of attribute => value
+	 */
+	function getRowAttrs( $row ) {
+		$class = $this->getRowClass( $row );
+		if ( $class === '' ) {
+			// Return an empty array to avoid clutter in HTML like class=""
+			return array();
+		} else {
+			return array( 'class' => $this->getRowClass( $row ) );
+		}
+	}
+
+	/**
+	 * Get any extra attributes to be applied to the given cell. Don't
+	 * take this as an excuse to hardcode styles; use classes and
+	 * CSS instead.  Row context is available in $this->mCurrentRow
+	 *
+	 * @protected
+	 *
+	 * @param string $field The column
+	 * @param string $value The cell contents
+	 * @return array Array of attr => value
+	 */
+	function getCellAttrs( $field, $value ) {
+		return array( 'class' => 'TablePager_col_' . $field );
+	}
+
+	/**
+	 * @protected
+	 * @return string
+	 */
+	function getIndexField() {
+		return $this->mSort;
+	}
+
+	/**
+	 * @protected
+	 * @return string
+	 */
+	function getTableClass() {
+		return 'TablePager';
+	}
+
+	/**
+	 * @protected
+	 * @return string
+	 */
+	function getNavClass() {
+		return 'TablePager_nav';
+	}
+
+	/**
+	 * @protected
+	 * @return string
+	 */
+	function getSortHeaderClass() {
+		return 'TablePager_sort';
+	}
+
+	/**
+	 * A navigation bar with images
+	 * @return string HTML
+	 */
+	public function getNavigationBar() {
+		if ( !$this->isNavigationBarShown() ) {
+			return '';
+		}
+
+		$labels = array(
+			'first' => 'table_pager_first',
+			'prev' => 'table_pager_prev',
+			'next' => 'table_pager_next',
+			'last' => 'table_pager_last',
+		);
+
+		$linkTexts = array();
+		$disabledTexts = array();
+		foreach ( $labels as $type => $label ) {
+			$msgLabel = $this->msg( $label )->escaped();
+			$linkTexts[$type] = "<div class='TablePager_nav-enabled'>$msgLabel</div>";
+			$disabledTexts[$type] = "<div class='TablePager_nav-disabled'>$msgLabel</div>";
+		}
+		$links = $this->getPagingLinks( $linkTexts, $disabledTexts );
+
+		$s = Html::openElement( 'table', array( 'class' => $this->getNavClass() ) );
+		$s .= Html::openElement( 'tr' ) . "\n";
+		$width = 100 / count( $links ) . '%';
+		foreach ( $labels as $type => $label ) {
+			// We want every cell to have the same width. We could use table-layout: fixed; in CSS,
+			// but it only works if we specify the width of a cell or the table and we don't want to.
+			// There is no better way. <http://www.w3.org/TR/CSS2/tables.html#fixed-table-layout>
+			$s .= Html::rawElement( 'td',
+				array( 'style' => "width: $width;", 'class' => "TablePager_nav-$type" ),
+				$links[$type] ) . "\n";
+		}
+		$s .= Html::closeElement( 'tr' ) . Html::closeElement( 'table' ) . "\n";
+		return $s;
+	}
+
+	/**
+	 * ResourceLoader modules that must be loaded to provide correct styling for this pager
+	 * @since 1.24
+	 * @return string[]
+	 */
+	public function getModuleStyles() {
+		return array( 'mediawiki.pager.tablePager' );
+	}
+
+	/**
+	 * Get a "<select>" element which has options for each of the allowed limits
+	 *
+	 * @param string $attribs Extra attributes to set
+	 * @return string HTML fragment
+	 */
+	public function getLimitSelect( $attribs = array() ) {
+		$select = new XmlSelect( 'limit', false, $this->mLimit );
+		$select->addOptions( $this->getLimitSelectList() );
+		foreach ( $attribs as $name => $value ) {
+			$select->setAttribute( $name, $value );
+		}
+		return $select->getHTML();
+	}
+
+	/**
+	 * Get a list of items to show in a "<select>" element of limits.
+	 * This can be passed directly to XmlSelect::addOptions().
+	 *
+	 * @since 1.22
+	 * @return array
+	 */
+	public function getLimitSelectList() {
+		# Add the current limit from the query string
+		# to avoid that the limit is lost after clicking Go next time
+		if ( !in_array( $this->mLimit, $this->mLimitsShown ) ) {
+			$this->mLimitsShown[] = $this->mLimit;
+			sort( $this->mLimitsShown );
+		}
+		$ret = array();
+		foreach ( $this->mLimitsShown as $key => $value ) {
+			# The pair is either $index => $limit, in which case the $value
+			# will be numeric, or $limit => $text, in which case the $value
+			# will be a string.
+			if ( is_int( $value ) ) {
+				$limit = $value;
+				$text = $this->getLanguage()->formatNum( $limit );
+			} else {
+				$limit = $key;
+				$text = $value;
+			}
+			$ret[$text] = $limit;
+		}
+		return $ret;
+	}
+
+	/**
+	 * Get \<input type="hidden"\> elements for use in a method="get" form.
+	 * Resubmits all defined elements of the query string, except for a
+	 * blacklist, passed in the $blacklist parameter.
+	 *
+	 * @param array $blacklist Parameters from the request query which should not be resubmitted
+	 * @return string HTML fragment
+	 */
+	function getHiddenFields( $blacklist = array() ) {
+		$blacklist = (array)$blacklist;
+		$query = $this->getRequest()->getQueryValues();
+		foreach ( $blacklist as $name ) {
+			unset( $query[$name] );
+		}
+		$s = '';
+		foreach ( $query as $name => $value ) {
+			$s .= Html::hidden( $name, $value ) . "\n";
+		}
+		return $s;
+	}
+
+	/**
+	 * Get a form containing a limit selection dropdown
+	 *
+	 * @return string HTML fragment
+	 */
+	function getLimitForm() {
+		return Html::rawElement(
+			'form',
+			array(
+				'method' => 'get',
+				'action' => wfScript(),
+			),
+			"\n" . $this->getLimitDropdown()
+		) . "\n";
+	}
+
+	/**
+	 * Gets a limit selection dropdown
+	 *
+	 * @return string
+	 */
+	function getLimitDropdown() {
+		# Make the select with some explanatory text
+		$msgSubmit = $this->msg( 'table_pager_limit_submit' )->escaped();
+
+		return $this->msg( 'table_pager_limit' )
+			->rawParams( $this->getLimitSelect() )->escaped() .
+			"\n<input type=\"submit\" value=\"$msgSubmit\"/>\n" .
+			$this->getHiddenFields( array( 'limit' ) );
+	}
+
+	/**
+	 * Return true if the named field should be sortable by the UI, false
+	 * otherwise
+	 *
+	 * @param string $field
+	 */
+	abstract function isFieldSortable( $field );
+
+	/**
+	 * Format a table cell. The return value should be HTML, but use an empty
+	 * string not &#160; for empty cells. Do not include the <td> and </td>.
+	 *
+	 * The current result row is available as $this->mCurrentRow, in case you
+	 * need more context.
+	 *
+	 * @protected
+	 *
+	 * @param string $name The database field name
+	 * @param string $value The value retrieved from the database
+	 */
+	abstract function formatValue( $name, $value );
+
+	/**
+	 * The database field name used as a default sort order.
+	 *
+	 * @protected
+	 *
+	 * @return string
+	 */
+	abstract function getDefaultSort();
+
+	/**
+	 * An array mapping database field names to a textual description of the
+	 * field name, for use in the table header. The description should be plain
+	 * text, it will be HTML-escaped later.
+	 *
+	 * @return array
+	 */
+	abstract function getFieldNames();
+}