private static DateVariable?ParseRawDate(IO.JsonReader jr)
{
// init
DateVariable?result = null;
// string expected
jr.Validate(IO.JsonNodeType.String);
var text = (string)jr.Value;
// try parse
#warning Expand and improve raw date parsing
DateTime date;
int year;
if (DateTime.TryParse(text, out date))
{
// success
result = new DateVariable(date);
}
else if (int.TryParse(text, out year))
{
result = new DateVariable(year, null, null, null, false);
}
else
{
// failure
throw new DataFormatException(jr, "Invalid raw date value '{0}'.", jr.Value);
}
// skip value
jr.Read();
// done
return(result);
}
private IVariable ParseDateVariable(IO.JsonReader jr)
{
// init
IVariable result = null;
// node type
switch (jr.NodeType)
{
case IO.JsonNodeType.String:
result = new TextVariable((string)jr.Value);
jr.Read();
break;
case IO.JsonNodeType.StartOfObject:
// init
int?[][] dateParts = new int?[][] { };
bool? circa = null;
DateVariable?raw = null;
string literal = null;
Season? season = null;
// skip
jr.Read();
// read properties
while (jr.NodeType == IO.JsonNodeType.PropertyName)
{
// init
var propertyName = (string)jr.Value;
jr.Read();
// property
switch (propertyName.ToLower())
{
case "date-parts":
dateParts = this.ParseDateVariableDateParts(jr);
break;
case "raw":
raw = ParseRawDate(jr);
break;
case "literal":
literal = jr.ReadAsString();
break;
case "circa":
circa = jr.ReadAsBoolean();
break;
case "season":
season = this.ParseSeason(jr);
break;
default:
throw new DataFormatException(jr, "Unexpected property '{0}'.", propertyName);
}
}
// valid date?
if (raw.HasValue)
{
// raw
if (dateParts.Length > 0 || literal != null)
{
throw new DataFormatException(jr, "Date parts and literal properties are not allowed for raw date variables.");
}
// done
result = new DateVariable(raw.Value.YearFrom, raw.Value.SeasonFrom, raw.Value.MonthFrom, raw.Value.DayFrom, raw.Value.YearTo, raw.Value.SeasonTo, raw.Value.MonthTo, raw.Value.DayTo, circa ?? false);
}
else if (literal != null)
{
// literal
if (dateParts.Length > 0 || raw != null || circa != null)
{
throw new DataFormatException(jr, "Date parts, raw and circa properties are not allowed for literal date variables.");
}
// done
result = new TextVariable(literal);
}
else
{
// dateparts
switch (dateParts.Length)
{
case 0:
result = null;
break;
case 1:
result = new DateVariable(dateParts[0][0].Value, season, dateParts[0][1], dateParts[0][2], circa ?? false);
break;
case 2:
result = new DateVariable(dateParts[0][0].Value, season, dateParts[0][1], dateParts[0][2], dateParts[1][0].Value, season, dateParts[1][1], dateParts[1][2], circa ?? false);
break;
default:
throw new DataFormatException(jr, "Invalid date variable.");
}
}
// end object
jr.Read(IO.JsonNodeType.EndOfObject);
break;
default:
throw new DataFormatException(jr, "Json token '{0}' cannot be parsed into a text variable.", jr.NodeType);
}
// done
return(result);
}
