Unbenannt

class DoomsDay {
	static var _instance : DoomsDay;
	static function main () : Void {
		var args = neko.Sys.args();
		neko.Lib.println( DoomsDay.weekdates( Std.parseInt( args.shift() ), Std.parseInt( args.shift() ), Std.parseInt( args.shift() ) ) );
	}
	
	public static function weekdates ( year : Int, month : Int, weekday : Int ) : Array<Int> {
		var dd = new DoomsDay( year );
		var dayOfFirst = dd.weekday( month, 1 );
		var first = 1 + ((weekday - dayOfFirst + 7) % 7);
		
		var lim = dd.daysPerMonth[ month - 1 ];
		var day = first;
		var result = new Array<Int>();
		result.push( first );
		while( (day += 7) <= lim ) {
			result.push( day );
		}
		
		return result;
	}
	
	public static function dayOfWeek ( year : Int, month : Int, day : Int ) : Int {
		var dd = new DoomsDay( year );
		return dd.weekday( month, day );
	}
		
	public static function daysInMonth ( year : Int, month : Int ) : Int {
		return (new DoomsDay( year )).daysPerMonth[ month -1 ];
	}





	static var anchorDays : Array<Int> = [ 1, 6, 4, 2 ];
	
	var doomsday : Int;
	var doomsdayInMonth : Array<Int>;
	var daysPerMonth : Array<Int>;
	
	private function new ( year : Int ) {
		// anchor day
		var anchorDay = anchorDays[ Math.floor( year / 100 ) % 4 ];
		
		// doomsday
		var centYear = year % 100;
		doomsday = ((Math.floor( centYear / 12 ) + (centYear % 12) + Math.floor( (centYear % 12) / 4 )) % 7 + anchorDay) % 7;
		
		// leap year?
		var leapYear : Bool;
		if( year % 4 == 0 ) {
			if( year % 100 == 0 ) {
				if( year % 400 == 0 ) {
					leapYear = true;
				} else {
					leapYear = false;
				}
			} else {
				leapYear = true;
			}
		} else {
			leapYear = false;
		}
		
		// doomsday in a given month
		if( leapYear ) {
			doomsdayInMonth = [ 3, 0, 6, 3, 1, 5, 3, 0, 4, 2, 6, 4, 1, 5 ];
			daysPerMonth = [ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ];
		} else {
			doomsdayInMonth = [ 2, 6, 6, 3, 1, 5, 3, 0, 4, 2, 6, 4, 1, 5 ];
			daysPerMonth = [ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ];
		}
	}
	
	function weekday ( month : Int, day : Int ) : Int {
		var dim = doomsdayInMonth[ month - 1 ];
		var offset = (day - dim + 6) % 7;
		
		return (offset + doomsday) % 7;
	}
}