/// <summary>
/// Initializes a new instance of the <see cref="CharacterMap{T}"/> class.
/// </summary>
/// <param name="maps">The states.</param>
/// <exception cref="ArgumentNullException"></exception>
public CharacterMap(IEnumerable <KeyValuePair <char, T> > maps)
{
if (maps is null)
{
ThrowHelper.ArgumentNullException(nameof(maps));
}
var charSet = new HashSet <char>();
int maxChar = 0;
foreach (var map in maps)
{
var openingChar = map.Key;
charSet.Add(openingChar);
if (openingChar < 128)
{
maxChar = Math.Max(maxChar, openingChar);
if (openingChar == 0)
{
ThrowHelper.ArgumentOutOfRangeException("Null is not a valid opening character.", nameof(maps));
}
}
else
{
nonAsciiMap ??= new Dictionary <uint, T>();
}
}
OpeningCharacters = charSet.ToArray();
Array.Sort(OpeningCharacters);
asciiMap = new T[maxChar + 1];
foreach (var state in maps)
{
char openingChar = state.Key;
if (openingChar < 128)
{
asciiMap[openingChar] ??= state.Value;
isOpeningCharacter.Set(openingChar);
}
else if (!nonAsciiMap !.ContainsKey(openingChar))
{
nonAsciiMap[openingChar] = state.Value;
}
}
#if NETCOREAPP3_1_OR_GREATER
if (nonAsciiMap is null)
{
long bitmap_0_3 = 0;
long bitmap_4_7 = 0;
foreach (char openingChar in OpeningCharacters)
{
int position = (openingChar >> 4) | ((openingChar & 0x0F) << 3);
if (position < 64)
{
bitmap_0_3 |= 1L << position;
}
else
{
bitmap_4_7 |= 1L << (position - 64);
}
}
_asciiBitmap = Vector128.Create(bitmap_0_3, bitmap_4_7).AsByte();
}
#endif
}