SpanLineEnumerator.cs

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namespace System.Text;
 
public ref struct SpanLineEnumerator
{
    private ReadOnlySpan<char> _remaining;
 
    private ReadOnlySpan<char> _current;
 
    private bool _isEnumeratorActive;
 
    public ReadOnlySpan<char> Current => _current;
 
    internal SpanLineEnumerator(ReadOnlySpan<char> buffer)
    {
        _remaining = buffer;
        _current = default(ReadOnlySpan<char>);
        _isEnumeratorActive = true;
    }
 
    public SpanLineEnumerator GetEnumerator()
    {
        return this;
    }
 
    public bool MoveNext()
    {
        if (!_isEnumeratorActive)
        {
            return false;
        }
        int stride;
        int num = string.IndexOfNewlineChar(_remaining, out stride);
        if (num >= 0)
        {
            _current = _remaining.Slice(0, num);
            _remaining = _remaining.Slice(num + stride);
        }
        else
        {
            _current = _remaining;
            _remaining = default(ReadOnlySpan<char>);
            _isEnumeratorActive = false;
        }
        return true;
    }
}