コード例 #1
0
        private static void InvariantCreateSortKeyOrdinalIgnoreCase(ReadOnlySpan <char> source, Span <byte> sortKey)
        {
            Debug.Assert(sortKey.Length >= source.Length * sizeof(char));

            for (int i = 0; i < source.Length; i++)
            {
                char c = source[i];
                if (char.IsHighSurrogate(c) && i < source.Length - 1)
                {
                    char cl = source[i + 1];
                    if (char.IsLowSurrogate(cl))
                    {
                        SurrogateCasing.ToUpper(c, cl, out char hr, out char lr);
                        BinaryPrimitives.WriteUInt16BigEndian(sortKey, hr);
                        BinaryPrimitives.WriteUInt16BigEndian(sortKey, lr);
                        i++;
                        sortKey = sortKey.Slice(2 * sizeof(ushort));
                        continue;
                    }
                }

                // convert machine-endian to big-endian
                BinaryPrimitives.WriteUInt16BigEndian(sortKey, (ushort)InvariantModeCasing.ToUpper(c));
                sortKey = sortKey.Slice(sizeof(ushort));
            }
        }
コード例 #2
0
ファイル: InvariantModeCasing.cs プロジェクト: z77ma/runtime
        internal static string ToUpper(string s)
        {
            if (s.Length == 0)
            {
                return(string.Empty);
            }

            ReadOnlySpan <char> source = s;

            int i = 0;

            while (i < s.Length)
            {
                if (char.IsHighSurrogate(source[i]) && i < s.Length - 1 && char.IsLowSurrogate(source[i + 1]))
                {
                    SurrogateCasing.ToUpper(source[i], source[i + 1], out char h, out char l);
                    if (source[i] != h || source[i + 1] != l)
                    {
                        break;
                    }

                    i += 2;
                    continue;
                }

                if (ToUpper(source[i]) != source[i])
                {
                    break;
                }

                i++;
            }

            if (i >= s.Length)
            {
                return(s);
            }

            return(string.Create(s.Length, (s, i), static (destination, state) =>
            {
                ReadOnlySpan <char> src = state.s;
                src.Slice(0, state.i).CopyTo(destination);
                InvariantModeCasing.ToUpper(src.Slice(state.i), destination.Slice(state.i));
            }));
        }