ReadOnlySpanSeparatorEnumerator.cs

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using System;
 
namespace IKVM.Runtime.Syntax
{
 
    ref struct ReadOnlySpanSeparatorEnumerator
    {
 
        ReadOnlySpan<char> name;
        ReadOnlySpan<char> curr;
        readonly char separator;
 
        public ReadOnlySpanSeparatorEnumerator(ReadOnlySpan<char> name, char separator)
        {
            this.name = name;
            curr = default;
            this.separator = separator;
        }
 
        public ReadOnlySpanSeparatorEnumerator GetEnumerator() => this;
 
        public ReadOnlySpan<char> Current => curr;
 
        public bool MoveNext()
        {
            var span = name;
            if (span.Length == 0)
                return false;
 
            var index = span.IndexOf(separator);
            if (index == -1)
            {
                name = ReadOnlySpan<char>.Empty;
                curr = span;
                return true;
            }
 
            curr = span.Slice(0, index);
            name = span.Slice(index + 1);
            return true;
        }
 
    }
}