ReviewR.Diff.DiffReader.ReadLine C# (CSharp) Method

        private static LineDiff ReadLine(LineReader reader)
        {
            while (!reader.EndOfFile && String.IsNullOrWhiteSpace(reader.Current))
            {
                reader.NextLine();
            }
            if (reader.EndOfFile) { return null; }

            LineDiffType type;
            char typeChar = reader.Current[0];
            switch (typeChar)
            {
                case '+':
                    type = LineDiffType.Added;
                    break;
                case '-':
                    type = LineDiffType.Removed;
                    break;
                case ' ':
                    type = LineDiffType.Same;
                    break;
                default:
                    // Start of next hunk or file
                    return null;
            }
            LineDiff line = new LineDiff(type, reader.Current.Substring(1).TrimEnd('\n', '\r'));
            reader.NextLine();
            return line;
        }