private void WriteHeaders(CsvParser parser, char outputDelimiter, LineBuffer buffer, ICollection <int> captureIndexes)
{
var outHeaders = new List <string>();
for (var i = 0; i < parser.Headers.Length; i++)
{
// only get the headers for which we have mappings
if (!_configuration.TryGetValue(parser.Headers[i], out var format) || !format.IsMapped)
{
continue;
}
outHeaders.Add(format.Destination);
captureIndexes.Add(i);
}
buffer.AddAsync(string.Join(outputDelimiter, outHeaders)).Wait();
}
public async Task RemapAsync(char outputDelimiter, int lineBufferSize = 4000)
{
if (_isDisposed)
{
throw new ObjectDisposedException(nameof(CsvMapper));
}
var currentLine = new List <string>();
var wroteHeader = false;
var captureIndexes = new List <int>();
var lineBuffer = new LineBuffer(_outStream, lineBufferSize);
while (_parser.Read()) // each record
{
if (!wroteHeader)
{
WriteHeaders(_parser, outputDelimiter, lineBuffer, captureIndexes);
wroteHeader = true;
}
currentLine.Clear();
for (var i = 0; i < _parser.CurrentRecord.Length; i++) // process each field
{
// skip if we don't have any info for the field
if (!_configuration.TryGetValue(_parser.Headers[i], out var format) ||
!format.IsMapped ||
!captureIndexes.Contains(i))
{
continue;
}
currentLine.Add($"{(_parser.UsingQuotedFields ? $"\"{Mutate(_parser.CurrentRecord[i], format)}\"" : Mutate(_parser.CurrentRecord[i], format))}");
}
await lineBuffer.AddAsync(string.Join(outputDelimiter, currentLine));
}
await lineBuffer.FlushAsync();
}