public static bool TryParse(string str, out Column column)
{
column = null;
if (string.IsNullOrEmpty(str))
{
return(false);
}
if (!ColumnParsingUtils.TryParse(str, out string name, out string sourceStr, out string kindStr))
{
return(false);
}
DataKind?kind = null;
if (kindStr != null && TypeParsingUtils.TryParseDataKind(kindStr, out DataKind parsedKind, out KeyRange range))
{
kind = parsedKind;
}
if (!int.TryParse(sourceStr, out int source))
{
return(false);
}
column = new Column()
{
Name = name,
Source = source,
Type = kind
};
return(true);
}
protected override bool TryParse(string str)
{
Contracts.AssertNonEmpty(str);
// We accept N:T:S where N is the new column name, T is the new type,
// and S is source column names.
string extra;
if (!base.TryParse(str, out extra))
{
return(false);
}
if (extra == null)
{
return(true);
}
DataKind kind;
if (!TypeParsingUtils.TryParseDataKind(extra, out kind, out KeyRange))
{
return(false);
}
ResultType = kind == default(DataKind) ? default(DataKind?) : kind;
return(true);
}