UnicodeUtility.cs

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using System.Runtime.CompilerServices;
 
namespace System.Text;
 
internal static class UnicodeUtility
{
    public static int GetPlane(uint codePoint)
    {
        return (int)(codePoint >> 16);
    }
 
    public static uint GetScalarFromUtf16SurrogatePair(uint highSurrogateCodePoint, uint lowSurrogateCodePoint)
    {
        return (highSurrogateCodePoint << 10) + lowSurrogateCodePoint - 56613888;
    }
 
    public static int GetUtf16SequenceLength(uint value)
    {
        value -= 65536;
        value += 33554432;
        value >>= 24;
        return (int)value;
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static void GetUtf16SurrogatesFromSupplementaryPlaneScalar(uint value, out char highSurrogateCodePoint, out char lowSurrogateCodePoint)
    {
        highSurrogateCodePoint = (char)(value + 56557568 >> 10);
        lowSurrogateCodePoint = (char)((value & 0x3FF) + 56320);
    }
 
    public static int GetUtf8SequenceLength(uint value)
    {
        int num = (int)(value - 2048) >> 31;
        value ^= 0xF800u;
        value -= 63616;
        value += 67108864;
        value >>= 24;
        return (int)value + num * 2;
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static bool IsAsciiCodePoint(uint value)
    {
        return value <= 127;
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static bool IsBmpCodePoint(uint value)
    {
        return value <= 65535;
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static bool IsHighSurrogateCodePoint(uint value)
    {
        return IsInRangeInclusive(value, 55296u, 56319u);
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static bool IsInRangeInclusive(uint value, uint lowerBound, uint upperBound)
    {
        return value - lowerBound <= upperBound - lowerBound;
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static bool IsLowSurrogateCodePoint(uint value)
    {
        return IsInRangeInclusive(value, 56320u, 57343u);
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static bool IsSurrogateCodePoint(uint value)
    {
        return IsInRangeInclusive(value, 55296u, 57343u);
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static bool IsValidCodePoint(uint codePoint)
    {
        return codePoint <= 1114111;
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static bool IsValidUnicodeScalar(uint value)
    {
        return ((value - 1114112) ^ 0xD800) >= 4293855232u;
    }
}