public static IEnumerable <string> ReadLazy(this TextReader reader, string separator)
{
StringBuilder builder = new StringBuilder();
Queue <char> separatorBuffer = new Queue <char>(separator.Length);
while (reader.CanPeek())
{
char nextChar = (char)reader.Read();
if (nextChar == separator[separatorBuffer.Count])
{
separatorBuffer.Enqueue(nextChar);
if (separatorBuffer.Count == separator.Length)
{
yield return(builder.ToString());
builder.Length = 0;
separatorBuffer.Clear();
}
}
else
{
separatorBuffer.Enqueue(nextChar);
while (separatorBuffer.Any())
{
builder.Append(separatorBuffer.Dequeue());
if (separatorBuffer.SequenceEqual(separator.Take(separatorBuffer.Count)))
{
break;
}
}
}
yield return(builder + new string(separatorBuffer.ToArray()));
}
}
