StringRuneEnumerator.cs

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using System.Collections;
using System.Collections.Generic;
 
namespace System.Text;
 
public struct StringRuneEnumerator : IEnumerable<Rune>, IEnumerable, IEnumerator<Rune>, IDisposable, IEnumerator
{
    private readonly string _string;
 
    private Rune _current;
 
    private int _nextIndex;
 
    public Rune Current => _current;
 
    object? IEnumerator.Current => _current;
 
    internal StringRuneEnumerator(string value)
    {
        _string = value;
        _current = default(Rune);
        _nextIndex = 0;
    }
 
    public StringRuneEnumerator GetEnumerator()
    {
        return this;
    }
 
    public bool MoveNext()
    {
        if ((uint)_nextIndex >= _string.Length)
        {
            _current = default(Rune);
            return false;
        }
        if (!Rune.TryGetRuneAt(_string, _nextIndex, out _current))
        {
            _current = Rune.ReplacementChar;
        }
        _nextIndex += _current.Utf16SequenceLength;
        return true;
    }
 
    void IDisposable.Dispose()
    {
    }
 
    IEnumerator IEnumerable.GetEnumerator()
    {
        return this;
    }
 
    IEnumerator<Rune> IEnumerable<Rune>.GetEnumerator()
    {
        return this;
    }
 
    void IEnumerator.Reset()
    {
        _current = default(Rune);
        _nextIndex = 0;
    }
}