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   1  <?php
   2  /**
   3   * Efficient paging for SQL queries.
   4   *
   5   * This program is free software; you can redistribute it and/or modify
   6   * it under the terms of the GNU General Public License as published by
   7   * the Free Software Foundation; either version 2 of the License, or
   8   * (at your option) any later version.
   9   *
  10   * This program is distributed in the hope that it will be useful,
  11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13   * GNU General Public License for more details.
  14   *
  15   * You should have received a copy of the GNU General Public License along
  16   * with this program; if not, write to the Free Software Foundation, Inc.,
  17   * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18   * http://www.gnu.org/copyleft/gpl.html
  19   *
  20   * @file
  21   * @ingroup Pager
  22   */
  23  
  24  /**
  25   * IndexPager with a formatted navigation bar
  26   * @ingroup Pager
  27   */
  28  abstract class ReverseChronologicalPager extends IndexPager {
  29      public $mDefaultDirection = IndexPager::DIR_DESCENDING;
  30      public $mYear;
  31      public $mMonth;
  32  
  33  	function getNavigationBar() {
  34          if ( !$this->isNavigationBarShown() ) {
  35              return '';
  36          }
  37  
  38          if ( isset( $this->mNavigationBar ) ) {
  39              return $this->mNavigationBar;
  40          }
  41  
  42          $linkTexts = array(
  43              'prev' => $this->msg( 'pager-newer-n' )->numParams( $this->mLimit )->escaped(),
  44              'next' => $this->msg( 'pager-older-n' )->numParams( $this->mLimit )->escaped(),
  45              'first' => $this->msg( 'histlast' )->escaped(),
  46              'last' => $this->msg( 'histfirst' )->escaped()
  47          );
  48  
  49          $pagingLinks = $this->getPagingLinks( $linkTexts );
  50          $limitLinks = $this->getLimitLinks();
  51          $limits = $this->getLanguage()->pipeList( $limitLinks );
  52          $firstLastLinks = $this->msg( 'parentheses' )->rawParams( "{$pagingLinks['first']}" .
  53              $this->msg( 'pipe-separator' )->escaped() .
  54              "{$pagingLinks['last']}" )->escaped();
  55  
  56          $this->mNavigationBar = $firstLastLinks . ' ' .
  57              $this->msg( 'viewprevnext' )->rawParams(
  58                  $pagingLinks['prev'], $pagingLinks['next'], $limits )->escaped();
  59  
  60          return $this->mNavigationBar;
  61      }
  62  
  63  	function getDateCond( $year, $month ) {
  64          $year = intval( $year );
  65          $month = intval( $month );
  66  
  67          // Basic validity checks
  68          $this->mYear = $year > 0 ? $year : false;
  69          $this->mMonth = ( $month > 0 && $month < 13 ) ? $month : false;
  70  
  71          // Given an optional year and month, we need to generate a timestamp
  72          // to use as "WHERE rev_timestamp <= result"
  73          // Examples: year = 2006 equals < 20070101 (+000000)
  74          // year=2005, month=1    equals < 20050201
  75          // year=2005, month=12   equals < 20060101
  76          if ( !$this->mYear && !$this->mMonth ) {
  77              return;
  78          }
  79  
  80          if ( $this->mYear ) {
  81              $year = $this->mYear;
  82          } else {
  83              // If no year given, assume the current one
  84              $timestamp = MWTimestamp::getInstance();
  85              $year = $timestamp->format( 'Y' );
  86              // If this month hasn't happened yet this year, go back to last year's month
  87              if ( $this->mMonth > $timestamp->format( 'n' ) ) {
  88                  $year--;
  89              }
  90          }
  91  
  92          if ( $this->mMonth ) {
  93              $month = $this->mMonth + 1;
  94              // For December, we want January 1 of the next year
  95              if ( $month > 12 ) {
  96                  $month = 1;
  97                  $year++;
  98              }
  99          } else {
 100              // No month implies we want up to the end of the year in question
 101              $month = 1;
 102              $year++;
 103          }
 104  
 105          // Y2K38 bug
 106          if ( $year > 2032 ) {
 107              $year = 2032;
 108          }
 109  
 110          $ymd = (int)sprintf( "%04d%02d01", $year, $month );
 111  
 112          if ( $ymd > 20320101 ) {
 113              $ymd = 20320101;
 114          }
 115  
 116          $this->mOffset = $this->mDb->timestamp( "$ymd}000000" );
 117      }
 118  }