/// <summary>
/// Parses a MPC record line.
/// </summary>
/// <param name="Line">A string containing the MPC report. Must be exactly 80 ASCII8 characters long.</param>
/// <returns>An object observation instance.</returns>
public static ObsInstance ParseLine(string Line)
{
if (Line.Length != 80)
{
throw new ArgumentException("The line is too short. Expecting 80-character lines.", nameof(Line));
}
ObsInstance instance = new ObsInstance();
string PermanentID = Line.Substring(0, 5);
if (string.IsNullOrWhiteSpace(PermanentID))
{
instance.PackedMPN = null;
}
else
{
instance.PackedMPN = PermanentID;
}
string Designation = Line.Substring(5, 7);
if (string.IsNullOrWhiteSpace(Designation))
{
instance.ObjectDesignation = null;
}
else
{
instance.ObjectDesignation = Designation;
}
switch (Line[12])
{
case '*': instance.DetectionAsterisk = true; break;
case MPCSpace: instance.DetectionAsterisk = false; break;
default: throw new InvalidFieldException(InvalidFieldException.FieldType.DetectionAsterisk);
}
byte PubNote = (byte)Line[13];
byte N2 = (byte)Line[14];
instance.PubNote = (PublishingNote)PubNote;
instance.N2 = (Note2)N2;
string Date = Line.Substring(15, 10);
string Time = Line.Substring(25, 6);
var IC = System.Globalization.CultureInfo.InvariantCulture;
if (string.IsNullOrWhiteSpace(Date) | string.IsNullOrWhiteSpace(Time))
{
instance.ObsTime = null;
}
else
{
try
{
DateTime dt = DateTime.ParseExact(Date, "yyyy MM dd", IC);
double tval = double.Parse(Time, System.Globalization.NumberStyles.AllowDecimalPoint);
instance.ObsTime = dt.AddDays(tval);
}
catch (Exception ex) { throw new InvalidFieldException(InvalidFieldException.FieldType.ObsTime); }
}
string RA = Line.Substring(32, 12);
string Dec = Line.Substring(44, 12);
if (string.IsNullOrWhiteSpace(RA) | string.IsNullOrWhiteSpace(Dec))
{
instance.Coordinates = null;
}
else
{
try
{ EquatorialPoint eqp = ParseFromMPCString(RA + " " + Dec); instance.Coordinates = eqp; }
catch (Exception ex) { throw new InvalidFieldException(InvalidFieldException.FieldType.Coordinates); }
}
string Mag = Line.Substring(65, 4);
if (string.IsNullOrWhiteSpace(Mag))
{
instance.Mag = null;
}
else
{
if (double.TryParse(Mag, out double M))
{
instance.Mag = M;
}
else
{
throw new InvalidFieldException(InvalidFieldException.FieldType.Magnitude);
}
}
byte MagBand = (byte)Line[70];
instance.MagBand = (MagnitudeBand)MagBand;
string ObsCode = Line.Substring(77, 3);
if (string.IsNullOrWhiteSpace(ObsCode))
{
instance.ObservatoryCode = null;
}
else
{
instance.ObservatoryCode = ObsCode;
}
return(instance);
}
#pragma warning restore 1591
/// <summary>
/// Creates a MPC record line from a given object observation.
/// </summary>
/// <param name="ObservedObject">The object observation instance for which to create the record.</param>
/// <returns>A string containing the MPC report. Exactly 80 ASCII8 characters long.</returns>
public static string GenerateLine(ObsInstance ObservedObject)
{
StringBuilder Line = new StringBuilder();
Line.EnsureCapacity(100);
Line.Length = 80;
if (ObservedObject.PackedMPN == null)
{
ObservedObject.PackedMPN = new string(' ', 5);
}
else
{
ObservedObject.ObjectDesignation = new string(' ', 7);
}
if (ObservedObject.PackedMPN.Length != 5)
{
throw new InvalidFieldException(InvalidFieldException.FieldType.PackedMPN);
}
if (ObservedObject.ObjectDesignation == null)
{
ObservedObject.ObjectDesignation = new string(' ', 7);
}
if (ObservedObject.ObjectDesignation.Length != 7)
{
throw new InvalidFieldException(InvalidFieldException.FieldType.ObjectDesignation);
}
Line.Insert(0, ObservedObject.PackedMPN);
Line.Insert(5, ObservedObject.ObjectDesignation);
Line[12] = ObservedObject.DetectionAsterisk ? '*' : MPCSpace;
Line[13] = (char)((byte)ObservedObject.PubNote);
Line[14] = (char)((byte)ObservedObject.N2);
string DateString = new string(' ', 16);
if (ObservedObject.ObsTime.HasValue)
{
DateString = ObservedObject.ObsTime.Value.ToString("yyyy MM dd");
DateString += ObservedObject.ObsTime.Value.TimeOfDay.TotalDays.ToString(".00000");
}
Line.Insert(15, DateString);
Line.Insert(31, MPCSpace);
if (ObservedObject.Coordinates.HasValue)
{
Line.Insert(32, ObservedObject.Coordinates.Value.FormatToString(Format.MPC_RA));
Line.Insert(44, ObservedObject.Coordinates.Value.FormatToString(Format.MPC_Dec));
}
else
{
Line.Insert(32, new string(' ', 24));
}
int i;
for (i = 56; i < 65; i++)
{
Line[i] = MPCSpace;
}
if (ObservedObject.Mag.HasValue)
{
Line.Insert(65, ObservedObject.Mag.Value.ToString("00.0 "));
}
else
{
Line.Insert(65, new string(' ', 5));
}
Line[70] = (char)((byte)ObservedObject.MagBand);
for (i = 71; i < 77; i++)
{
Line[i] = MPCSpace;
}
if (ObservedObject.ObservatoryCode == null)
{
ObservedObject.ObservatoryCode = new string(' ', 3);
}
if (ObservedObject.ObservatoryCode.Length != 3)
{
throw new InvalidFieldException(InvalidFieldException.FieldType.ObservatoryCode);
}
Line.Insert(77, ObservedObject.ObservatoryCode);
return(Line.ToString().Substring(0, 80));
}
