Portable.Xaml.ParsedMarkupExtensionInfo.IndexOfAnyEscaped C# (CSharp) Method

		int IndexOfAnyEscaped (char[] ch, string value, char? escape, int startIdx)
		{
			if (escape == null)
				return value.IndexOfAny(ch, startIdx);

			int idx = 0, nextStart = startIdx;

			do
			{
				idx = ch.Length == 1 ? value.IndexOf (ch[0], nextStart) : value.IndexOfAny (ch, nextStart);
				nextStart = idx + 1;

				// If no good match, return; otherwise, check for escape characters
				if (idx < 0 || idx >= value.Length)
					break;
				else
				{
					// We need to handle repetitions. If there are an odd number of escape characters behind us, we
					// are escaped; if an even number, we aren't escaped.
					int numEscapes = 0;
					for (int i = idx - 1; i >=0 && value [i] == escape.Value; i--)
					{
						++numEscapes;
					}

					if (numEscapes % 2 == 0)
						break;
				}
			}
			while (true);

			return idx;
		}