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GuidExtensions.cs
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using System.Collections.Frozen;
namespace OtterGui;
public static class GuidExtensions
{
private const string Chars =
"0123456789"
+ "abcdefghij"
+ "klmnopqrst"
+ "uv";
private static ReadOnlySpan<byte> Bytes
=> "0123456789abcdefghijklmnopqrstuv"u8;
private static readonly FrozenDictionary<char, byte>
ReverseChars = Chars.WithIndex().ToFrozenDictionary(t => t.Value, t => (byte)t.Index);
private static readonly FrozenDictionary<byte, byte> ReverseBytes =
ReverseChars.ToFrozenDictionary(kvp => (byte)kvp.Key, kvp => kvp.Value);
/// <summary> Write only the first 8 hexadecimal digits of a GUID to a string (the digits up to the first dash in the default format). </summary>
public static unsafe string ShortGuid(this Guid guid)
{
var bytes = (byte*)&guid;
Span<char> text =
[
Chars[bytes[3] >> 4],
Chars[bytes[3] & 0x0F],
Chars[bytes[2] >> 4],
Chars[bytes[2] & 0x0F],
Chars[bytes[1] >> 4],
Chars[bytes[1] & 0x0F],
Chars[bytes[0] >> 4],
Chars[bytes[0] & 0x0F],
];
return new string(text);
}
public static unsafe string OptimizedString(this Guid guid)
{
var bytes = stackalloc ulong[2];
if (!guid.TryWriteBytes(new Span<byte>(bytes, 16)))
return guid.ToString("N");
var u1 = bytes[0];
var u2 = bytes[1];
Span<char> text =
[
Chars[(int)(u1 & 0x1F)],
Chars[(int)((u1 >> 5) & 0x1F)],
Chars[(int)((u1 >> 10) & 0x1F)],
Chars[(int)((u1 >> 15) & 0x1F)],
Chars[(int)((u1 >> 20) & 0x1F)],
Chars[(int)((u1 >> 25) & 0x1F)],
Chars[(int)((u1 >> 30) & 0x1F)],
Chars[(int)((u1 >> 35) & 0x1F)],
Chars[(int)((u1 >> 40) & 0x1F)],
Chars[(int)((u1 >> 45) & 0x1F)],
Chars[(int)((u1 >> 50) & 0x1F)],
Chars[(int)((u1 >> 55) & 0x1F)],
Chars[(int)((u1 >> 60) | ((u2 & 0x01) << 4))],
Chars[(int)((u2 >> 1) & 0x1F)],
Chars[(int)((u2 >> 6) & 0x1F)],
Chars[(int)((u2 >> 11) & 0x1F)],
Chars[(int)((u2 >> 16) & 0x1F)],
Chars[(int)((u2 >> 21) & 0x1F)],
Chars[(int)((u2 >> 26) & 0x1F)],
Chars[(int)((u2 >> 31) & 0x1F)],
Chars[(int)((u2 >> 36) & 0x1F)],
Chars[(int)((u2 >> 41) & 0x1F)],
Chars[(int)((u2 >> 46) & 0x1F)],
Chars[(int)((u2 >> 51) & 0x1F)],
Chars[(int)((u2 >> 56) & 0x1F)],
Chars[(int)((u2 >> 61) & 0x1F)],
];
return new string(text);
}
public static unsafe bool FromOptimizedString(ReadOnlySpan<char> text, out Guid guid)
{
if (text.Length != 26)
return Return(out guid);
var bytes = stackalloc ulong[2];
if (!ReverseChars.TryGetValue(text[0], out var b0))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[1], out var b1))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[2], out var b2))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[3], out var b3))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[4], out var b4))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[5], out var b5))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[6], out var b6))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[7], out var b7))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[8], out var b8))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[9], out var b9))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[10], out var b10))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[11], out var b11))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[12], out var b12))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[13], out var b13))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[14], out var b14))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[15], out var b15))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[16], out var b16))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[17], out var b17))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[18], out var b18))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[19], out var b19))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[20], out var b20))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[21], out var b21))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[22], out var b22))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[23], out var b23))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[24], out var b24))
return Return(out guid);
if (!ReverseChars.TryGetValue(text[25], out var b25))
return Return(out guid);
bytes[0] = b0
| ((ulong)b1 << 5)
| ((ulong)b2 << 10)
| ((ulong)b3 << 15)
| ((ulong)b4 << 20)
| ((ulong)b5 << 25)
| ((ulong)b6 << 30)
| ((ulong)b7 << 35)
| ((ulong)b8 << 40)
| ((ulong)b9 << 45)
| ((ulong)b10 << 50)
| ((ulong)b11 << 55)
| ((ulong)b12 << 60);
bytes[1] = ((ulong)b12 >> 4)
| ((ulong)b13 << 1)
| ((ulong)b14 << 6)
| ((ulong)b15 << 11)
| ((ulong)b16 << 16)
| ((ulong)b17 << 21)
| ((ulong)b18 << 26)
| ((ulong)b19 << 31)
| ((ulong)b20 << 36)
| ((ulong)b21 << 41)
| ((ulong)b22 << 46)
| ((ulong)b23 << 51)
| ((ulong)b24 << 56)
| ((ulong)b25 << 61);
guid = new Guid(new Span<byte>(bytes, 16));
return true;
static bool Return(out Guid guid)
{
guid = Guid.Empty;
return false;
}
}
public static unsafe bool FromOptimizedString(ReadOnlySpan<byte> text, out Guid guid)
{
if (text.Length != 26)
return Return(out guid);
var bytes = stackalloc ulong[2];
if (!ReverseBytes.TryGetValue(text[0], out var b0))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[1], out var b1))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[2], out var b2))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[3], out var b3))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[4], out var b4))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[5], out var b5))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[6], out var b6))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[7], out var b7))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[8], out var b8))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[9], out var b9))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[10], out var b10))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[11], out var b11))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[12], out var b12))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[13], out var b13))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[14], out var b14))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[15], out var b15))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[16], out var b16))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[17], out var b17))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[18], out var b18))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[19], out var b19))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[20], out var b20))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[21], out var b21))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[22], out var b22))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[23], out var b23))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[24], out var b24))
return Return(out guid);
if (!ReverseBytes.TryGetValue(text[25], out var b25))
return Return(out guid);
bytes[0] = b0
| ((ulong)b1 << 5)
| ((ulong)b2 << 10)
| ((ulong)b3 << 15)
| ((ulong)b4 << 20)
| ((ulong)b5 << 25)
| ((ulong)b6 << 30)
| ((ulong)b7 << 35)
| ((ulong)b8 << 40)
| ((ulong)b9 << 45)
| ((ulong)b10 << 50)
| ((ulong)b11 << 55)
| ((ulong)b12 << 60);
bytes[1] = ((ulong)b12 >> 4)
| ((ulong)b13 << 1)
| ((ulong)b14 << 6)
| ((ulong)b15 << 11)
| ((ulong)b16 << 16)
| ((ulong)b17 << 21)
| ((ulong)b18 << 26)
| ((ulong)b19 << 31)
| ((ulong)b20 << 36)
| ((ulong)b21 << 41)
| ((ulong)b22 << 46)
| ((ulong)b23 << 51)
| ((ulong)b24 << 56)
| ((ulong)b25 << 61);
guid = new Guid(new Span<byte>(bytes, 16));
return true;
static bool Return(out Guid guid)
{
guid = Guid.Empty;
return false;
}
}
}