public SylkTable Parse(Stream input, bool leaveOpen = false)
{
using var reader = new StreamReader(input, Encoding.UTF8, true, 1024, leaveOpen);
var isOnFirstLine = true;
while (true)
{
var line = reader.ReadLine();
var fields = line.Split(';');
var recordType = fields[0];
string GetField(string fieldName, bool mandatory)
{
foreach (var field in fields)
{
if (field.StartsWith(fieldName))
{
return(field.Substring(fieldName.Length));
}
}
if (mandatory)
{
throw new InvalidDataException($"Record does not contain mandatory field of type '{fieldName}'.");
}
return(null);
}
if (isOnFirstLine)
{
isOnFirstLine = false;
if (recordType != "ID")
{
throw new InvalidDataException("SYLK file must start with 'ID'.");
}
GetField("P", true);
}
else
{
switch (recordType)
{
case "ID":
throw new InvalidDataException("Record type 'ID' can only occur on the first line.");
case "B":
if (_table != null)
{
throw new InvalidDataException("Only one record of type 'B' may be present.");
}
_table = new SylkTable(int.Parse(GetField("X", true)), int.Parse(GetField("Y", true)));
break;
case "C":
if (_table == null)
{
throw new InvalidDataException("Unable to parse record of type 'C' before encountering a record of type 'B'.");
}
SetCellContent(GetField("X", true), GetField("Y", false), GetField("K", false));
break;
case "E":
return(_table);
default:
throw new NotSupportedException($"Support for record type '{recordType}' is not implemented. Only records of type 'ID', 'B', 'C', and 'E' are supported.");
}
}
}
}
public SylkSerializer(SylkTable table)
{
_table = table;
}