public override int Read(byte[] buffer, int offset, int count)
{
try
{
long position = _stream.Position;
if (position != _position - (_buffer.Count - _offset))
{
_buffer.Clear();
_offset = _buffer.Count;
_position = position;
}
}
catch (NotSupportedException)
{
}
int cached = Comparable.Min(count, _buffer.Count - _offset);
if (cached > 0)
{
//buffer.MoveRange();
buffer.Fill(i => _buffer[_offset + i], new Range(offset, cached));
}
int read = count - cached;
if (read > 0)
{
read = _stream.Read(buffer, offset, read);
if (read > _buffer.Capacity - _buffer.Count)
{
_buffer.RemoveRange(0, Comparable.Min(read - (_buffer.Capacity - _buffer.Count), _buffer.Count));
}
_buffer.AddRange(buffer.Skip(offset + cached + Comparable.Max(0, read - (_buffer.Capacity - _buffer.Count))).Take(Comparable.Min(read, _buffer.Capacity - _buffer.Count)));
}
return(cached + read);
}
public static IEnumerable <String> ReadLines(this TextReader reader, Func <IList <Char>, int> terminatorMatcher, Func <IList <Char>, string> terminatorConverter, int maxCount)
{
if (reader == null)
{
throw new ArgumentNullException("reader");
}
if (terminatorMatcher == null)
{
throw new ArgumentNullException("matchTerm");
}
if (maxCount < 0)
{
throw new ArgumentOutOfRangeException("maxCount");
}
if (maxCount == 0)
{
yield break;
}
int matched = 0;
var list = new PwrList <Char>();
var view = new PwrFrameListView <Char>(list);
var sb = new StringBuilder();
while (maxCount > 0)
{
int read = 0;
int accepted = 0;
while (true)
{
if (matched == list.Count)
{
if ((read = reader.Read()) < 0)
{
break;
}
else
{
list.PushLast((char)read);
}
}
view.FrameSize = matched + 1;
accepted = terminatorMatcher(view);
if (accepted > 0)
{
break;
}
else if (accepted == 0)
{
matched++;
}
else
{
matched = 0;
sb.Append(list.PopFirst());
}
}
if (accepted > matched + 1)
{
throw new InvalidOperationException("Accepted value is greater matched length.");
}
if (accepted > 0)
{
if (terminatorConverter == null)
{
sb.Append(list.GetRange(0, accepted).ToArray());
}
else
{
view.FrameSize = accepted;
string term = terminatorConverter(view);
if (!string.IsNullOrEmpty(term))
{
sb.Append(term);
}
}
yield return(sb.ToString());
sb.Clear();
list.RemoveRange(0, accepted);
matched = 0;
maxCount--;
}
if (read < 0)
{
break;
}
}
if (maxCount > 0)
{
if (list.Count > 0)
{
sb.AppendChars(list);
}
if (sb.Length > 0)
{
yield return(sb.ToString());
sb.Clear();
list.Clear();
}
}
}