1 files changed, 118 insertions, 0 deletions
diff --git a/includes/pager/ReverseChronologicalPager.php b/includes/pager/ReverseChronologicalPager.php
new file mode 100644
index 00000000..4f8c438d
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+++ 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" );
+	}
+}