public override void Write(TextWriter writer, TextSpan span, CancellationToken cancellationToken = default(CancellationToken))
{
if (span.Start < 0 || span.Start > _length || span.End > _length)
{
throw new ArgumentOutOfRangeException(nameof(span));
}
int count = span.Length;
if (count == 0)
{
return;
}
LargeTextWriter chunkWriter = writer as LargeTextWriter;
int chunkIndex = GetIndexFromPosition(span.Start);
int chunkStartOffset = span.Start - _chunkStartOffsets[chunkIndex];
while (true)
{
cancellationToken.ThrowIfCancellationRequested();
char[] chunk = _chunks[chunkIndex];
int charsToWrite = Math.Min(chunk.Length - chunkStartOffset, count);
if (chunkWriter != null && chunkStartOffset == 0 && charsToWrite == chunk.Length)
{
// reuse entire chunk
chunkWriter.AppendChunk(chunk);
}
else
{
writer.Write(chunk, chunkStartOffset, charsToWrite);
}
count -= charsToWrite;
if (count <= 0)
{
break;
}
chunkStartOffset = 0;
chunkIndex++;
}
}
private static SourceText FromLargeTextWriter(string source, Encoding encoding, SourceHashAlgorithm checksumAlgorithm)
{
using (var writer = new LargeTextWriter(encoding, checksumAlgorithm, source.Length))
{
writer.Write(source);
return writer.ToSourceText();
}
}