Source for file Christian.php

<?php
/* vim: set expandtab tabstop=4 shiftwidth=4: */
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2002 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.0 of the PHP license,       |
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// +----------------------------------------------------------------------+
// | Authors:   Carsten Lucke <luckec@tool-garage.de>                     |
// +----------------------------------------------------------------------+
//
//    $Id: Christian.php,v 1.6 2006/10/22 22:14:10 quipo Exp $
 
/**
 * class that calculates Christian holidays
 *
 * @category    Date
 * @package     Date_Holidays
 * @subpackage  Driver
 * @version     $Id: Christian.php,v 1.6 2006/10/22 22:14:10 quipo Exp $
 * @author      Carsten Lucke <luckec@tool-garage.de>
 */
class Date_Holidays_Driver_Christian extends Date_Holidays_Driver  
{
   /**
    * Constructor
    *
    * Use the Date_Holidays::factory() method to construct an object of a certain driver
    *
    * @access   protected
    */
    function Date_Holidays_Driver_Christian()
    {
    }
    
   /**
    * Build the internal arrays that contain data about the calculated holidays
    *
    * @access   protected
    * @return   boolean true on success, otherwise a PEAR_ErrorStack object
    * @throws   object PEAR_ErrorStack
    */
    function _buildHolidays()
    {
       /**
        * Circumcision of Jesus
        */
        $this->_addHoliday('jesusCircumcision', $this->_year . '-01-01', 'Circumcision of Jesus');
        
       /**
        * Epiphanias
        */
        $this->_addHoliday('epiphany', $this->_year . '-01-06', 'Epiphany');
        
       /**
 
        */
        $this->_addHoliday('mariaCleaning', $this->_year . '-02-02', 'Cleaning of Maria');
        
       /**
        * Josef's Day
        */
        $this->_addHoliday('josefsDay', $this->_year . '-03-19', 'Josef\'s Day');
        
       /**
        * Maria Announcement
        */
        $this->_addHoliday('mariaAnnouncement', $this->_year . '-03-25', 'Maria Announcement');
        
       /**
        * Easter Sunday
        */
        $easterDate         = Date_Holidays_Driver_Christian::calcEaster($this->_year);
        $this->_addHoliday('easter', $easterDate, 'Easter Sunday');
        
       /**
        * Palm Sunday
        */
        $palmSundayDate     = new Date($easterDate);
        $palmSundayDate->subtractSpan(new Date_Span('7, 0, 0, 0'));
        $this->_addHoliday('palmSunday', $palmSundayDate, 'Palm Sunday');
        
       /**
        * Passion Sunday
        */
        $passionSundayDate  = new Date($palmSundayDate);
        $passionSundayDate->subtractSpan(new Date_Span('7, 0, 0, 0'));
        $this->_addHoliday('passionSunday', $passionSundayDate, 'Passion Sunday');
        
       /**
        * Painful Friday
        */
        $painfulFridayDate  = new Date($palmSundayDate);
        $painfulFridayDate->subtractSpan(new Date_Span('2, 0, 0, 0'));
        $this->_addHoliday('painfulFriday', $painfulFridayDate, 'Painful Friday');
        
       /**
        * White Sunday
        */
        $whiteSundayDate    = new Date($easterDate);
        $whiteSundayDate->addSpan(new Date_Span('7, 0, 0, 0'));
        $this->_addHoliday('whiteSunday', $whiteSundayDate, 'White Sunday');
        
       /**
        * Ash Wednesday
        */
        $ashWednesdayDate   = new Date($easterDate);
        $ashWednesdayDate->subtractSpan(new Date_Span('46, 0, 0, 0'));
        $this->_addHoliday('ashWednesday', $ashWednesdayDate, 'Ash Wednesday');
        
       /**
        * Good Friday / Black Friday
        */
        $goodFridayDate     = new Date($easterDate);
        $goodFridayDate->subtractSpan(new Date_Span('2, 0, 0, 0'));
        $this->_addHoliday('goodFriday', $goodFridayDate, 'Good Friday');
        
       /**
        * Green Thursday
        */
        $this->_addHoliday('greenThursday', $goodFridayDate->getPrevDay(), 'Green Thursday');
        
       /**
        * Easter Monday
        */
        $this->_addHoliday('easterMonday', $easterDate->getNextDay(), 'Easter Monday');
        
       /**
        * Whitsun (determines Whit Monday, Ascension Day and Feast of Corpus Christi)
        */
        $whitsunDate        = new Date($easterDate);
        $whitsunDate->addSpan(new Date_Span('49, 0, 0, 0'));
        $this->_addHoliday('whitsun', $whitsunDate, 'Whitsun');
        
       /**
        * Request Sunday
        */
        $requestSunday      = new Date($whitsunDate);
        $requestSunday->subtractSpan(new Date_Span('14, 0, 0, 0'));
        $this->_addHoliday('requestSunday', $requestSunday, 'Request Sunday');
        
       /**
        * Ascension Day
        */
        $ascensionDayDate   = new Date($whitsunDate);
        $ascensionDayDate->subtractSpan(new Date_Span('10, 0, 0, 0'));
        $this->_addHoliday('ascensionDay', $ascensionDayDate, 'Ascension Day');
        
       /**
        * Whit Monday
        */
        $this->_addHoliday('whitMonday', $whitsunDate->getNextDay(), 'Whit Monday');
        
       /**
 
        */
        $this->_addHoliday('mariaHaunting', $this->_year . '-05-31', 'Haunting of Maria');
        
       /**
        * Trinitatis
        */
        $trinitatisDate     = new Date($whitsunDate);
        $trinitatisDate->addSpan(new Date_Span('7, 0, 0, 0'));
        $this->_addHoliday('trinitatis', $trinitatisDate, 'Trinitatis');
        
       /**
        * Feast of Corpus Christi
        */
        $corpusChristiDate  = new Date($whitsunDate);
        $corpusChristiDate->addSpan(new Date_Span('11, 0, 0, 0'));
        $this->_addHoliday('corpusChristi', $corpusChristiDate, 'Feast of Corpus Christi');
        
       /**
        * Heart of Jesus 
        *
        * Friday of the 3rd week past Whitsun
        */
        $heartJesusDate     = new Date($whitsunDate);
        $heartJesusDate->addSpan(new Date_Span('19, 0, 0, 0'));
        $this->_addHoliday('heartJesus', $heartJesusDate, 'Heart of Jesus celebration');
        
       /**
        * Johannis celebration
        */
        $this->_addHoliday('johannisCelebration', $this->_year . '-06-24', 'Johannis celebration');
        
       /**
        * Petrus and Paulus
        */
        $this->_addHoliday('petrusAndPaulus', $this->_year . '-06-29', 'Petrus and Paulus');
        
       /**
        * Ascension of Maria
        */
        $this->_addHoliday('mariaAscension', $this->_year . '-08-15', 'Ascension of Maria');
        
       /**
        * Celebration of raising the Cross
        */
        $this->_addHoliday('crossRaising', $this->_year . '-09-14', 'Celebration of raising the Cross');
        
       /**
        * Thanks Giving
        * 
        * Sunday past Michaelis (29. September)
        */
        $michaelisDate      = new Date($this->_year . '-09-29');
        $dayOfWeek          = $michaelisDate->getDayOfWeek();
        $michaelisDate->addSpan(new Date_Span(sprintf('%d, 0, 0, 0', 7 - $dayOfWeek)));
        $thanksGivingDate   = $michaelisDate;
        $this->_addHoliday('thanksGiving', $thanksGivingDate, 'Thanks Giving');
        
       /**
        * Kermis
        *
        * 3rd Sunday in October
        */
        $kermisDate         = new Date($this->_year . '-10-01');
        $dayOfWeek          = $kermisDate->getDayOfWeek();
        if ($dayOfWeek != 0) {
            $kermisDate->addSpan(new Date_Span(sprintf('%d, 0, 0, 0', 7 - $dayOfWeek)));
        }
        $kermisDate->addSpan(new Date_Span('14, 0, 0, 0'));
        $this->_addHoliday('kermis', $kermisDate, 'Kermis');
        
       /**
        * Reformation Day
        */
        $this->_addHoliday('reformationDay', $this->_year . '-10-31', 'Reformation Day');
        
       /**
        * All Saints' Day
        */
        $this->_addHoliday('allSaintsDay', $this->_year . '-11-01', 'All Saints\' Day');
        
       /**
        * All Souls' Day
        */
        $this->_addHoliday('allSoulsDay', $this->_year . '-11-02', 'All Souls\' Day');
        
       /**
        * Martin's Day
        */
        $this->_addHoliday('martinsDay', $this->_year . '-11-11', 'Martin\'s Day');
        
       /**
        * 4th Advent
        */
        $Advent4Date        = new Date($this->_year . '-12-25');
        $dayOfWeek          = $Advent4Date->getDayOfWeek();
        if ($dayOfWeek == 0) {
            $dayOfWeek      = 7;
        }
        $Advent4Date->subtractSpan(new Date_Span(sprintf('%d, 0, 0, 0', $dayOfWeek)));
        $this->_addHoliday('advent4', $Advent4Date, '4th Advent');
        
       /**
        * 1st Advent
        */
        $Advent1Date        = new Date($Advent4Date);
        $Advent1Date->subtractSpan(new Date_Span('21, 0, 0, 0'));
        $this->_addHoliday('advent1', $Advent1Date, '1st Advent');
        
       /**
        * 2nd Advent
        */
        $Advent2Date        = new Date($Advent4Date);
        $Advent2Date->subtractSpan(new Date_Span('14, 0, 0, 0'));
        $this->_addHoliday('advent2', $Advent2Date, '2nd Advent');
        
       /**
        * 3rd Advent
        */
        $Advent3Date        = new Date($Advent4Date);
        $Advent3Date->subtractSpan(new Date_Span('7, 0, 0, 0'));
        $this->_addHoliday('advent3', $Advent3Date, '3rd Advent');
        
       /**
        * Death' Sunday
        */
        $deathSundayDate    = new Date($Advent1Date);
        $deathSundayDate->subtractSpan(new Date_Span('7, 0, 0, 0'));
        $this->_addHoliday('deathSunday', $deathSundayDate, 'Death\' Sunday');
        
       /**
        * Day of Repentance
        */
        $dayOfRepentance    = new Date($deathSundayDate);
        $dayOfRepentance->subtractSpan(new Date_Span('4, 0, 0, 0'));
        $this->_addHoliday('dayOfRepentance', $dayOfRepentance, 'Day of Repentance');
        
       /**
        * St. Nicholas' Day
        */
        $this->_addHoliday('stNicholasDay', $this->_year . '-12-06', 'St. Nicholas\' Day');
        
       /**
        * Maria' conception
        */
        $this->_addHoliday('mariaConception', $this->_year . '-12-08', 'Conception of Maria');
        
       /**
        * Christmas Eve
        */
        $this->_addHoliday('xmasEve', $this->_year . '-12-24', 'Christmas Eve');
        
       /**
        * Christmas day
        */
        $this->_addHoliday('xmasDay', $this->_year . '-12-25', 'Christmas Day');
        
       /**
        * Boxing day
        */
        $this->_addHoliday('boxingDay', $this->_year . '-12-26', 'Boxing Day');
        
       /**
        * New Year's Eve
        */
        $this->_addHoliday('newYearsEve', $this->_year . '-12-31', 'New Year\'s Eve');
        
        if (Date_Holidays::errorsOccurred()) {
            return Date_Holidays::getErrorStack();
        }
        return true;
    }
    
   /**
    * Calculates date for Easter using the Gaussian algorithm.
    *
    * @static
    * @access   public
    * @param    int     $year   year
    * @return   object Date 
    */
    function calcEaster($year)
    {
        // golden number
        $golden     = null;
        $century    = null;
        // 23-Epact (modulo 30)
        $epact      = null;
        // number of days from 21 March to the Paschal Full Moon
        $i          = null;
        // weekday of the Full Moon (0=Sunday,...)
        $j          = null; 
        
        if ($year > 1582) {
            $golden     = $year % 19;
            $century    = floor($year / 100);
            $epact      = ($century - floor($century / 4) - floor((8 * $century + 13) / 25)+ 19 * $golden + 15) % 30;
            $i          = $epact - floor($epact / 28) * (1 - floor($epact / 28) * floor(29 / ($epact + 1)) * floor((21 - $golden) / 11));
            $j          = ($year + floor($year / 4) + $i + 2 - $century + floor($century / 4));
            $j          = $j % 7;
        } else {
            $golden = $year % 19;
            $i      = (19 * $golden + 15) % 30; 
            $j      = ($year + floor($year / 4) + $i) % 7;
        }
        $l      = $i - $j;
        $month  = 3 + floor(($l + 40) / 44);
        $day    = $l + 28 - 31 * floor($month / 4);
        
        $date = new Date(sprintf('%04d-%02d-%02d', $year, $month, $day));
        return $date;
    }
}
?>