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ReverseChronologicalPager.php
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ReverseChronologicalPager.php
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<?php
/**
* 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
*/
namespace MediaWiki\Pager;
use DateTime;
use MediaWiki\Html\Html;
use MediaWiki\Utils\MWTimestamp;
use Wikimedia\Timestamp\TimestampException;
/**
* IndexPager with a formatted navigation bar.
*
* @stable to extend
* @ingroup Pager
*/
abstract class ReverseChronologicalPager extends IndexPager {
/** @var bool */
public $mDefaultDirection = IndexPager::DIR_DESCENDING;
/** @var bool Whether to group items by date */
public $mGroupByDate = false;
/** @var int */
public $mYear;
/** @var int */
public $mMonth;
/** @var int */
public $mDay;
/** @var string */
private $lastHeaderDate;
/** @var string */
protected $endOffset;
/**
* @param string $date
* @return string
*/
protected function getHeaderRow( string $date ): string {
$headingClass = $this->isFirstHeaderRow() ?
// We use mw-index-pager- prefix here on the anticipation that this method will
// eventually be upstreamed to apply to other pagers. For now we constrain the
// change to ReverseChronologicalPager to reduce the risk of pages this touches
// in case there are any bugs.
'mw-index-pager-list-header-first mw-index-pager-list-header' :
'mw-index-pager-list-header';
$s = $this->isFirstHeaderRow() ? '' : $this->getEndGroup();
$s .= Html::element( 'h4', [
'class' => $headingClass,
],
$date
);
$s .= $this->getStartGroup();
return $s;
}
/**
* Determines if a header row is needed based on the current state of the IndexPager.
*
* @since 1.38
* @param string $date Formatted date header
* @return bool
*/
protected function isHeaderRowNeeded( string $date ): bool {
if ( !$this->mGroupByDate ) {
return false;
}
return $date && $this->lastHeaderDate !== $date;
}
/**
* Determines whether the header row is the first that will be outputted to the page.
*
* @since 1.38
* @return bool
*/
final protected function isFirstHeaderRow(): bool {
return $this->lastHeaderDate === null;
}
/**
* Returns the name of the timestamp field. Subclass can override this to provide the
* timestamp field if they are using a aliased field for getIndexField()
*
* @since 1.40
* @return string
*/
public function getTimestampField() {
// This is a chronological pager, so the first column should be some kind of timestamp
return is_array( $this->mIndexField ) ? $this->mIndexField[0] : $this->mIndexField;
}
/**
* Get date from the timestamp
*
* @since 1.38
* @param string $timestamp
* @return string Formatted date header
*/
final protected function getDateFromTimestamp( string $timestamp ) {
return $this->getLanguage()->userDate( $timestamp, $this->getUser() );
}
/**
* @inheritDoc
*/
protected function getRow( $row ): string {
$s = '';
$timestampField = $this->getTimestampField();
$timestamp = $row->$timestampField ?? null;
$date = $timestamp ? $this->getDateFromTimestamp( $timestamp ) : null;
if ( $date && $this->isHeaderRowNeeded( $date ) ) {
$s .= $this->getHeaderRow( $date );
$this->lastHeaderDate = $date;
}
$s .= $this->formatRow( $row );
return $s;
}
/**
* Start a new group of page rows.
*
* @stable to override
* @since 1.38
* @return string
*/
protected function getStartGroup(): string {
return "<ul class=\"mw-contributions-list\">\n";
}
/**
* End an existing group of page rows.
*
* @stable to override
* @since 1.38
* @return string
*/
protected function getEndGroup(): string {
return '</ul>';
}
/**
* @inheritDoc
*/
protected function getFooter(): string {
return $this->getEndGroup();
}
/**
* @stable to override
* @return string HTML
*/
public function getNavigationBar() {
if ( !$this->isNavigationBarShown() ) {
return '';
}
if ( isset( $this->mNavigationBar ) ) {
return $this->mNavigationBar;
}
$navBuilder = $this->getNavigationBuilder()
->setPrevMsg( 'pager-newer-n' )
->setNextMsg( 'pager-older-n' )
->setFirstMsg( 'histlast' )
->setLastMsg( 'histfirst' );
$this->mNavigationBar = $navBuilder->getHtml();
return $this->mNavigationBar;
}
/**
* Set and return the offset timestamp such that we can get all revisions with
* a timestamp up to the specified parameters.
*
* @stable to override
*
* @param int $year Year up to which we want revisions
* @param int $month Month up to which we want revisions
* @param int $day [optional] Day up to which we want revisions. Default is end of month.
* @return string|null Timestamp or null if year and month are false/invalid
*/
public function getDateCond( $year, $month, $day = -1 ) {
$year = (int)$year;
$month = (int)$month;
$day = (int)$day;
// Basic validity checks for year and month
// If year and month are invalid, don't update the offset
if ( $year <= 0 && ( $month <= 0 || $month >= 13 ) ) {
return null;
}
$timestamp = self::getOffsetDate( $year, $month, $day );
try {
// The timestamp used for DB queries is at midnight of the *next* day after the selected date.
$selectedDate = new DateTime( $timestamp->getTimestamp( TS_ISO_8601 ) );
$selectedDate = $selectedDate->modify( '-1 day' );
$this->mYear = (int)$selectedDate->format( 'Y' );
$this->mMonth = (int)$selectedDate->format( 'm' );
$this->mDay = (int)$selectedDate->format( 'd' );
// Don't mess with mOffset which IndexPager uses
$this->endOffset = $this->mDb->timestamp( $timestamp->getTimestamp() );
} catch ( TimestampException $e ) {
// Invalid user provided timestamp (T149257)
return null;
}
return $this->endOffset;
}
/**
* Core logic of determining the offset timestamp such that we can get all items with
* a timestamp up to the specified parameters. Given parameters for a day up to which to get
* items, this function finds the timestamp of the day just after the end of the range for use
* in a database strict inequality filter.
*
* This is separate from getDateCond so we can use this logic in other places, such as in
* RangeChronologicalPager, where this function is used to convert year/month/day filter options
* into a timestamp.
*
* @param int $year Year up to which we want revisions
* @param int $month Month up to which we want revisions
* @param int $day [optional] Day up to which we want revisions. Default is end of month.
* @return MWTimestamp Timestamp or null if year and month are false/invalid
*/
public static function getOffsetDate( $year, $month, $day = -1 ) {
// Given an optional year, month, and day, 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
// year=2005, month=12, day=5 equals < 20051206
if ( $year <= 0 ) {
// 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 ( $month > $timestamp->format( 'n' ) ) {
$year--;
}
}
if ( $month && $month > 0 && $month < 13 ) {
// Day validity check after we have month and year checked
$day = checkdate( $month, $day, $year ) ? $day : false;
if ( $day && $day > 0 ) {
// If we have a day, we want up to the day immediately afterward
$day++;
// Did we overflow the current month?
if ( !checkdate( $month, $day, $year ) ) {
$day = 1;
$month++;
}
} else {
// If no day, assume beginning of next month
$day = 1;
$month++;
}
// Did we overflow the current year?
if ( $month > 12 ) {
$month = 1;
$year++;
}
} else {
// No month implies we want up to the end of the year in question
$month = 1;
$day = 1;
$year++;
}
$ymd = sprintf( "%04d%02d%02d", $year, $month, $day );
return MWTimestamp::getInstance( "{$ymd}000000" );
}
/**
* Return the end offset, extensions can use this if they are not in the context of subclass.
*
* @since 1.40
* @return string
*/
public function getEndOffset() {
return $this->endOffset;
}
/**
* @inheritDoc
*/
protected function buildQueryInfo( $offset, $limit, $order ) {
[ $tables, $fields, $conds, $fname, $options, $join_conds ] = parent::buildQueryInfo(
$offset,
$limit,
$order
);
if ( $this->endOffset ) {
$conds[] = $this->mDb->expr( $this->getTimestampField(), '<', $this->endOffset );
}
return [ $tables, $fields, $conds, $fname, $options, $join_conds ];
}
}
/** @deprecated class alias since 1.41 */
class_alias( ReverseChronologicalPager::class, 'ReverseChronologicalPager' );

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