SurrogateCasing.cs

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using System.Runtime.CompilerServices;
using System.Text;
 
namespace System.Globalization;
 
internal static class SurrogateCasing
{
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    internal static void ToUpper(char h, char l, out char hr, out char lr)
    {
        UnicodeUtility.GetUtf16SurrogatesFromSupplementaryPlaneScalar(CharUnicodeInfo.ToUpper(UnicodeUtility.GetScalarFromUtf16SurrogatePair(h, l)), out hr, out lr);
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    internal static void ToLower(char h, char l, out char hr, out char lr)
    {
        UnicodeUtility.GetUtf16SurrogatesFromSupplementaryPlaneScalar(CharUnicodeInfo.ToLower(UnicodeUtility.GetScalarFromUtf16SurrogatePair(h, l)), out hr, out lr);
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    internal static bool Equal(char h1, char l1, char h2, char l2)
    {
        ToUpper(h1, l1, out var hr, out var lr);
        ToUpper(h2, l2, out var hr2, out var lr2);
        if (hr == hr2)
        {
            return lr == lr2;
        }
        return false;
    }
}