ReverseChronologicalPager.php

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<?php
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 = [
            '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;
        }

        // Treat the given time in the wiki timezone and get a UTC timestamp for the database lookup
        $timestamp = MWTimestamp::getInstance( "${ymd}000000" );
        $timestamp->setTimezone( $this->getConfig()->get( 'Localtimezone' ) );

        $this->mOffset = $this->mDb->timestamp( $timestamp->getTimestamp() );
    }
}