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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
* @ingroup Pager
*/
use Wikimedia\Timestamp\TimestampException;
/**
* Efficient paging for SQL queries.
* IndexPager with a formatted navigation bar.
* @ingroup Pager
*/
abstract class ReverseChronologicalPager extends IndexPager {
public $mDefaultDirection = IndexPager::DIR_DESCENDING;
public $mYear;
public $mMonth;
public $mDay;
public function getNavigationBar() {
if ( !$this->isNavigationBarShown() ) {
return '';
}
if ( isset( $this->mNavigationBar ) ) {
return $this->mNavigationBar;
}
$linkTexts = [
'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;
}
/**
* Set and return the mOffset timestamp such that we can get all revisions with
* a timestamp up to the specified parameters.
*
* @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 mOffset
if ( $year <= 0 && ( $month <= 0 || $month >= 13 ) ) {
return null;
}
// Treat the given time in the wiki timezone and get a UTC timestamp for the database lookup
$timestamp = self::getOffsetDate( $year, $month, $day );
$timestamp->setTimezone( $this->getConfig()->get( 'Localtimezone' ) );
try {
$this->mYear = (int)$timestamp->format( 'Y' );
$this->mMonth = (int)$timestamp->format( 'm' );
$this->mDay = (int)$timestamp->format( 'd' );
$this->mOffset = $this->mDb->timestamp( $timestamp->getTimestamp() );
} catch ( TimestampException $e ) {
// Invalid user provided timestamp (T149257)
return null;
}
return $this->mOffset;
}
/**
* Core logic of determining the mOffset 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 an 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++;
}
// Y2K38 bug
if ( $year > 2032 ) {
$year = 2032;
}
$ymd = (int)sprintf( "%04d%02d%02d", $year, $month, $day );
if ( $ymd > 20320101 ) {
$ymd = 20320101;
}
return MWTimestamp::getInstance( "${ymd}000000" );
}
}
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