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using System;
using System.Collections.Generic;
using System.Linq;
namespace IrcTokens
{
public static class Extensions
{
public static IEnumerable<byte[]> Split(this byte[] bytes, byte separator)
{
if (bytes == null || bytes.Length == 0) return new List<byte[]>();
var newLineIndices = bytes.Select((b, i) => b == separator ? i : -1).Where(i => i != -1).ToArray();
var lines = new byte[newLineIndices.Length + 1][];
var currentIndex = 0;
var arrIndex = 0;
for (var i = 0; i < newLineIndices.Length && currentIndex < bytes.Length; ++i)
{
var n = new byte[newLineIndices[i] - currentIndex];
Array.Copy(bytes, currentIndex, n, 0, newLineIndices[i] - currentIndex);
currentIndex = newLineIndices[i] + 1;
lines[arrIndex++] = n;
}
// Handle the last string at the end of the array if there is one.
if (currentIndex < bytes.Length)
lines[arrIndex] = bytes.Skip(currentIndex).ToArray();
else if (arrIndex == newLineIndices.Length)
// We had a separator character at the end of a string. Rather than just allowing
// a null character, we'll replace the last element in the array with an empty string.
lines[arrIndex] = Array.Empty<byte>();
return lines.ToArray();
}
public static byte[] Trim(this IEnumerable<byte> bytes, byte separator)
{
if (bytes == null || !bytes.Any()) return Array.Empty<byte>();
var byteList = new List<byte>(bytes);
var i = 0;
while (byteList[i] == separator)
{
byteList.RemoveAt(i);
i++;
}
i = byteList.Count - 1;
while (byteList[i] == separator)
{
byteList.RemoveAt(i);
i--;
}
return byteList.ToArray();
}
}
}
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