spectre.console/src/Spectre.Console/Internal/Ansi/AnsiDecorationBuilder.cs

using System.Collections.Generic;

namespace Spectre.Console.Internal
{
    internal static class AnsiDecorationBuilder
    {
        // TODO: Rewrite this to not yield
        public static IEnumerable<byte> GetAnsiCodes(Decoration decoration)
        {
            if ((decoration & Decoration.Bold) != 0)
            {
                yield return 1;
            }

            if ((decoration & Decoration.Dim) != 0)
            {
                yield return 2;
            }

            if ((decoration & Decoration.Italic) != 0)
            {
                yield return 3;
            }

            if ((decoration & Decoration.Underline) != 0)
            {
                yield return 4;
            }

            if ((decoration & Decoration.SlowBlink) != 0)
            {
                yield return 5;
            }

            if ((decoration & Decoration.RapidBlink) != 0)
            {
                yield return 6;
            }

            if ((decoration & Decoration.Invert) != 0)
            {
                yield return 7;
            }

            if ((decoration & Decoration.Conceal) != 0)
            {
                yield return 8;
            }

            if ((decoration & Decoration.Strikethrough) != 0)
            {
                yield return 9;
            }
        }
    }
}