internal DynamicReader(IReaderAdapter reader, DynamicBoundConfiguration config, object?context)
: base(reader, config, context, new DynamicRowConstructor(), config.Options.ExtraColumnTreatment)
{
NameLookupReferenceCount = 0;
NameLookup = NameLookup.Empty;
DelegateCache = new ConcurrentDictionary <object, Delegate>();
}
private void HandleHeaders()
{
var options = Configuration.Options;
ReadHeaders = options.ReadHeader;
var allowColumnsByName = options.ReadHeader == ReadHeader.Always;
using (var reader = new HeadersReader <object>(StateMachine, Configuration, SharedCharacterLookup, Inner, Buffer, Utils.NonNullValue(RowEndings)))
{
var(headers, isHeader, pushBack) = reader.Read();
ColumnCount = headers.Count;
if (ColumnCount == 0)
{
// rare, but possible if the file is empty or all comments or something like that
ColumnNames.Value = Array.Empty <string>();
}
else
{
string[] columnNamesValue = Array.Empty <string>();
if (allowColumnsByName)
{
columnNamesValue = new string[ColumnCount];
ColumnNames.Value = columnNamesValue;
using (var e = headers)
{
var ix = 0;
while (e.MoveNext())
{
var name = allowColumnsByName ? new string(e.Current.Span) : null;
if (name != null)
{
columnNamesValue[ix] = name;
}
ix++;
}
}
Interlocked.Increment(ref NameLookupReferenceCount);
NameLookup = NameLookup.Create(columnNamesValue, Configuration.MemoryPool);
}
RowBuilder.SetColumnOrder(Configuration.Options, headers);
}
Buffer.PushBackFromOutsideBuffer(pushBack);
}
TryMakeStateMachine();
}