PHP Decode

<?php // BUILD: Remove line 
 





















 
class SG_iCal_Freq { 
	protected $weekdays = array('MO'=>'monday', 'TU'=>'tuesday', 'WE'=>'wednesday', 'TH'=>'thursday', 'FR'=>'friday', 'SA'=>'saturday', 'SU'=>'sunday'); 
	protected $knownRules = array('month', 'weekno', 'day', 'monthday', 'yearday', 'hour', 'minute'); //others : 'setpos', 'second' 
	protected $ruleModifiers = array('wkst'); 
	protected $simpleMode = true; 
 
	protected $rules = array('freq'=>'yearly', 'interval'=>1); 
	protected $start = 0; 
	protected $freq = ''; 
 
	protected $excluded; //EXDATE 
	protected $added;    //RDATE 
 
	protected $cache; // getAllOccurrences() 
 
	





 
	public function __construct( $rule, $start, $excluded=array(), $added=array()) { 
		$this->start = $start; 
		$this->excluded = array(); 
 
		$rules = array(); 
		foreach( explode(';', $rule) AS $v) { 
		  if( strpos( $v, '=' ) === false ) 
		    continue; 
		   
			list($k, $v) = explode('=', $v); 
			$this->rules[ strtolower($k) ] = $v; 
		} 
 
		if( isset($this->rules['until']) && is_string($this->rules['until']) ) { 
			$this->rules['until'] = strtotime($this->rules['until']); 
		} 
		$this->freq = strtolower($this->rules['freq']); 
 
		foreach( $this->knownRules AS $rule ) { 
			if( isset($this->rules['by' . $rule]) ) { 
				if( $this->isPrerule($rule, $this->freq) ) { 
					$this->simpleMode = false; 
				} 
			} 
		} 
 
		if(!$this->simpleMode) { 
			if(! (isset($this->rules['byday']) || isset($this->rules['bymonthday']) || isset($this->rules['byyearday']))) { 
				$this->rules['bymonthday'] = date('d', $this->start); 
			} 
		} 
 
		//set until, and cache 
		if( isset($this->rules['count']) ) { 
 
			$cache[$ts] = $ts = $this->start; 
			for($n=1; $n < $this->rules['count']; $n++) { 
				$ts = $this->findNext($ts); 
				$cache[$ts] = $ts; 
			} 
			$this->rules['until'] = $ts; 
 
			//EXDATE 
			if (!empty($excluded)) { 
				foreach($excluded as $ts) { 
					unset($cache[$ts]); 
				} 
			} 
			//RDATE 
			if (!empty($added)) { 
				$cache = $cache + $added; 
				asort($cache); 
			} 
 
			$this->cache = array_values($cache); 
		} 
 
		$this->excluded = $excluded; 
		$this->added = $added; 
	} 
 
 
	


 
	public function getAllOccurrences() { 
		if (empty($this->cache)) { 
			//build cache 
			$next = $this->firstOccurrence(); 
			while ($next) { 
				$cache[] = $next; 
				$next = $this->findNext($next); 
			} 
			if (!empty($this->added)) { 
				$cache = $cache + $this->added; 
				asort($cache); 
			} 
			$this->cache = $cache; 
		} 
		return $this->cache; 
	} 
 
	




 
	public function previousOccurrence( $offset ) { 
		if (!empty($this->cache)) { 
			$t2=$this->start; 
			foreach($this->cache as $ts) { 
				if ($ts >= $offset) 
					return $t2; 
				$t2 = $ts; 
			} 
		} else { 
			$ts = $this->start; 
			while( ($t2 = $this->findNext($ts)) < $offset) { 
				if( $t2 == false ){ 
					break; 
				} 
				$ts = $t2; 
			} 
		} 
		return $ts; 
	} 
 
	



 
	public function nextOccurrence( $offset ) { 
		if ($offset < $this->start) 
			return $this->firstOccurrence(); 
		return $this->findNext($offset); 
	} 
 
	


 
	public function firstOccurrence() { 
		$t = $this->start; 
		if ( is_array( $this->excluded ) && in_array($t, $this->excluded)) 
			$t = $this->findNext($t); 
		return $t; 
	} 
 
	



 
	public function lastOccurrence() { 
		//build cache if not done 
		$this->getAllOccurrences(); 
		//return last timestamp in cache 
		return end($this->cache); 
	} 
 
	





















 
	public function findNext($offset) { 
		if (!empty($this->cache)) { 
			foreach($this->cache as $ts) { 
				if ($ts > $offset) 
					return $ts; 
			} 
		} 
 
		$debug = false; 
 
		//make sure the offset is valid 
		if( $offset === false || (isset($this->rules['until']) && $offset > $this->rules['until']) ) { 
			if($debug) echo 'STOP: ' . date('r', $offset) . "
"; 
			return false; 
		} 
 
		$found = true; 
 
		//set the timestamp of the offset (ignoring hours and minutes unless we want them to be 
		//part of the calculations. 
		if($debug) echo 'O: ' . date('r', $offset) . "
"; 
		$hour = (in_array($this->freq, array('hourly','minutely')) && $offset > $this->start) ? date('H', $offset) : date('H', $this->start); 
		$minute = (($this->freq == 'minutely' || isset($this->rules['byminute'])) && $offset > $this->start) ? date('i', $offset) : date('i', $this->start); 
		$t = mktime($hour, $minute, date('s', $this->start), date('m', $offset), date('d', $offset), date('Y',$offset)); 
		if($debug) echo 'START: ' . date('r', $t) . "
"; 
 
		if( $this->simpleMode ) { 
			if( $offset < $t ) { 
				$ts = $t; 
				if ($ts && in_array($ts, $this->excluded)) 
					$ts = $this->findNext($ts); 
			} else { 
				$ts = $this->findStartingPoint( $t, $this->rules['interval'], false ); 
				if( !$this->validDate( $ts ) ) { 
					$ts = $this->findNext($ts); 
				} 
			} 
			return $ts; 
		} 
 
		$eop = $this->findEndOfPeriod($offset); 
		if($debug) echo 'EOP: ' . date('r', $eop) . "
"; 
 
		foreach( $this->knownRules AS $rule ) { 
			if( $found && isset($this->rules['by' . $rule]) ) { 
				if( $this->isPrerule($rule, $this->freq) ) { 
					$subrules = explode(',', $this->rules['by' . $rule]); 
					$_t = null; 
					foreach( $subrules AS $subrule ) { 
						$imm = call_user_func_array(array($this, 'ruleBy' . $rule), array($subrule, $t)); 
						if( $imm === false ) { 
							break; 
						} 
						if($debug) echo strtoupper($rule) . ': ' . date('r', $imm) . ' A: ' . ((int) ($imm > $offset && $imm < $eop)) . "
"; 
						if( $imm > $offset && $imm < $eop && ($_t == null || $imm < $_t) ) { 
							$_t = $imm; 
						} 
					} 
					if( $_t !== null ) { 
						$t = $_t; 
					} else { 
						$found = $this->validDate($t); 
					} 
				} 
			} 
		} 
 
		if( $offset < $this->start && $this->start < $t ) { 
			$ts = $this->start; 
		} else if( $found && ($t != $offset)) { 
			if( $this->validDate( $t ) ) { 
				if($debug) echo 'OK' . "
"; 
				$ts = $t; 
			} else { 
				if($debug) echo 'Invalid' . "
"; 
				$ts = $this->findNext($t); 
			} 
		} else { 
			if($debug) echo 'Not found' . "
"; 
			$ts = $this->findNext( $this->findStartingPoint( $offset, $this->rules['interval'] ) ); 
		} 
		if ( is_array( $this->excluded ) && $ts && in_array($ts, $this->excluded)) 
			return $this->findNext($ts); 
 
		return $ts; 
	} 
 
	






 
	private function findStartingPoint( $offset, $interval, $truncate = true ) { 
		$_freq = ($this->freq == 'daily') ? 'day__' : $this->freq; 
		$t = '+' . $interval . ' ' . substr($_freq,0,-2) . 's'; 
		if( $_freq == 'monthly' && $truncate ) { 
			if( $interval > 1) { 
				$offset = strtotime('+' . ($interval - 1) . ' months ', $offset); 
			} 
			$t = '+' . (date('t', $offset) - date('d', $offset) + 1) . ' days'; 
		} 
 
		$sp = strtotime($t, $offset); 
 
		if( $truncate ) { 
			$sp = $this->truncateToPeriod($sp, $this->freq); 
		} 
 
		return $sp; 
	} 
 
	



 
	public function findEndOfPeriod($offset) { 
		return $this->findStartingPoint($offset, 1); 
	} 
 
	








 
	private function truncateToPeriod( $time, $freq ) { 
		$date = getdate($time); 
		switch( $freq ) { 
			case "yearly": 
				$date['mon'] = 1; 
			case "monthly": 
				$date['mday'] = 1; 
			case "daily": 
				$date['hours'] = 0; 
			case 'hourly': 
				$date['minutes'] = 0; 
			case "minutely": 
				$date['seconds'] = 0; 
				break; 
			case "weekly": 
				if( date('N', $time) == 1) { 
					$date['hours'] = 0; 
					$date['minutes'] = 0; 
					$date['seconds'] = 0; 
				} else { 
					$date = getdate(strtotime("last monday 0:00", $time)); 
				} 
				break; 
		} 
		$d = mktime($date['hours'], $date['minutes'], $date['seconds'], $date['mon'], $date['mday'], $date['year']); 
		return $d; 
	} 
 
	




 
	private function ruleByday($rule, $t) { 
		$dir = ($rule{0} == '-') ? -1 : 1; 
		$dir_t = ($dir == 1) ? 'next' : 'last'; 
 
 
		$d = $this->weekdays[substr($rule,-2)]; 
		$s = $dir_t . ' ' . $d . ' ' . date('H:i:s',$t); 
 
		if( $rule == substr($rule, -2) ) { 
			if( date('l', $t) == ucfirst($d) ) { 
				$s = 'today ' . date('H:i:s',$t); 
			} 
 
			$_t = strtotime($s, $t); 
 
			if( $_t == $t && in_array($this->freq, array('monthly', 'yearly')) ) { 
				// Yes. This is not a great idea.. but hey, it works.. for now 
				$s = 'next ' . $d . ' ' . date('H:i:s',$t); 
				$_t = strtotime($s, $_t); 
			} 
 
			return $_t; 
		} else { 
			$_f = $this->freq; 
			if( isset($this->rules['bymonth']) && $this->freq == 'yearly' ) { 
				$this->freq = 'monthly'; 
			} 
			if( $dir == -1 ) { 
				$_t = $this->findEndOfPeriod($t); 
			} else { 
				$_t = $this->truncateToPeriod($t, $this->freq); 
			} 
			$this->freq = $_f; 
 
			$c = preg_replace('/[^0-9]/','',$rule); 
			$c = ($c == '') ? 1 : $c; 
 
			$n = $_t; 
			while($c > 0 ) { 
				if( $dir == 1 && $c == 1 && date('l', $t) == ucfirst($d) ) { 
					$s = 'today ' . date('H:i:s',$t); 
				} 
				$n = strtotime($s, $n); 
				$c--; 
			} 
 
			return $n; 
		} 
	} 
 
	private function ruleBymonth($rule, $t) { 
		$_t = mktime(date('H',$t), date('i',$t), date('s',$t), $rule, date('d', $t), date('Y', $t)); 
		if( $t == $_t && isset($this->rules['byday']) ) { 
			// TODO: this should check if one of the by*day's exists, and have a multi-day value 
			return false; 
		} else { 
			return $_t; 
		} 
	} 
 
	private function ruleBymonthday($rule, $t) { 
		if( $rule < 0 ) { 
			$rule = date('t', $t) + $rule + 1; 
		} 
		return mktime(date('H',$t), date('i',$t), date('s',$t), date('m', $t), $rule, date('Y', $t)); 
	} 
 
	private function ruleByyearday($rule, $t) { 
		if( $rule < 0 ) { 
			$_t = $this->findEndOfPeriod(); 
			$d = '-'; 
		} else { 
			$_t = $this->truncateToPeriod($t, $this->freq); 
			$d = '+'; 
		} 
		$s = $d . abs($rule -1) . ' days ' . date('H:i:s',$t); 
		return strtotime($s, $_t); 
	} 
 
	private function ruleByweekno($rule, $t) { 
		if( $rule < 0 ) { 
			$_t = $this->findEndOfPeriod(); 
			$d = '-'; 
		} else { 
			$_t = $this->truncateToPeriod($t, $this->freq); 
			$d = '+'; 
		} 
 
		$sub = (date('W', $_t) == 1) ? 2 : 1; 
		$s = $d . abs($rule - $sub) . ' weeks ' . date('H:i:s',$t); 
		$_t  = strtotime($s, $_t); 
 
		return $_t; 
	} 
 
	private function ruleByhour($rule, $t) { 
		$_t = mktime($rule, date('i',$t), date('s',$t), date('m',$t), date('d', $t), date('Y', $t)); 
		return $_t; 
	} 
 
	private function ruleByminute($rule, $t) { 
		$_t = mktime(date('h',$t), $rule, date('s',$t), date('m',$t), date('d', $t), date('Y', $t)); 
		return $_t; 
	} 
 
	private function validDate( $t ) { 
		if( isset($this->rules['until']) && $t > $this->rules['until'] ) { 
			return false; 
		} 
 
		if ( is_array( $this->excluded ) && in_array($t, $this->excluded)) { 
			return false; 
		} 
 
		if( isset($this->rules['bymonth']) ) { 
			$months = explode(',', $this->rules['bymonth']); 
			if( !in_array(date('m', $t), $months)) { 
				return false; 
			} 
		} 
		if( isset($this->rules['byday']) ) { 
			$days = explode(',', $this->rules['byday']); 
			foreach( $days As $i => $k ) { 
				$days[$i] = $this->weekdays[ preg_replace('/[^A-Z]/', '', $k)]; 
			} 
			if( !in_array(strtolower(date('l', $t)), $days)) { 
				return false; 
			} 
		} 
		if( isset($this->rules['byweekno']) ) { 
			$weeks = explode(',', $this->rules['byweekno']); 
			if( !in_array(date('W', $t), $weeks)) { 
				return false; 
			} 
		} 
		if( isset($this->rules['bymonthday'])) { 
			$weekdays = explode(',', $this->rules['bymonthday']); 
			foreach( $weekdays As $i => $k ) { 
				if( $k < 0 ) { 
					$weekdays[$i] = date('t', $t) + $k + 1; 
				} 
			} 
			if( !in_array(date('d', $t), $weekdays)) { 
				return false; 
			} 
		} 
		if( isset($this->rules['byhour']) ) { 
			$hours = explode(',', $this->rules['byhour']); 
			if( !in_array(date('H', $t), $hours)) { 
				return false; 
			} 
		} 
 
		return true; 
	} 
 
	private function isPrerule($rule, $freq) { 
		if( $rule == 'year') 
			return false; 
		if( $rule == 'month' && $freq == 'yearly') 
			return true; 
		if( $rule == 'monthday' && in_array($freq, array('yearly', 'monthly')) && !isset($this->rules['byday'])) 
			return true; 
		// TODO: is it faster to do monthday first, and ignore day if monthday exists? - prolly by a factor of 4.. 
		if( $rule == 'yearday' && $freq == 'yearly' ) 
			return true; 
		if( $rule == 'weekno' && $freq == 'yearly' ) 
			return true; 
		if( $rule == 'day' && in_array($freq, array('yearly', 'monthly', 'weekly'))) 
			return true; 
		if( $rule == 'hour' && in_array($freq, array('yearly', 'monthly', 'weekly', 'daily'))) 
			return true; 
		if( $rule == 'minute' ) 
			return true; 
 
		return false; 
	} 
} 
 ?>