SpanRuneEnumerator.cs

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namespace System.Text;
 
public ref struct SpanRuneEnumerator
{
    private ReadOnlySpan<char> _remaining;
 
    private Rune _current;
 
    public Rune Current => _current;
 
    internal SpanRuneEnumerator(ReadOnlySpan<char> buffer)
    {
        _remaining = buffer;
        _current = default(Rune);
    }
 
    public SpanRuneEnumerator GetEnumerator()
    {
        return this;
    }
 
    public bool MoveNext()
    {
        if (_remaining.IsEmpty)
        {
            _current = default(Rune);
            return false;
        }
        int num = Rune.ReadFirstRuneFromUtf16Buffer(_remaining);
        if (num < 0)
        {
            num = Rune.ReplacementChar.Value;
        }
        _current = Rune.UnsafeCreate((uint)num);
        _remaining = _remaining.Slice(_current.Utf16SequenceLength);
        return true;
    }
}