/// <summary>
/// Creates an instance of the <see cref="ValueMatchEnumerator"/> for the passed in <paramref name="regex"/> which iterates over <paramref name="input"/>.
/// </summary>
/// <param name="regex">The <see cref="Regex"/> to use for finding matches.</param>
/// <param name="input">The input span to iterate over.</param>
/// <param name="startAt">The position where the engine should start looking for matches from.</param>
internal ValueMatchEnumerator(Regex regex, ReadOnlySpan <char> input, int startAt)
{
_regex = regex;
_input = input;
_current = default;
_startAt = startAt;
_prevLen = -1;
}
/// <summary>
/// Advances the enumerator to the next match in the span.
/// </summary>
/// <returns>
/// <see langword="true"/> if the enumerator was successfully advanced to the next element; <see langword="false"/> if the enumerator cannot find additional matches.
/// </returns>
public bool MoveNext()
{
(bool Success, int Index, int Length, int TextPosition)match = _regex.RunSingleMatch(RegexRunnerMode.BoundsRequired, _prevLen, _input, _startAt);
if (match.Success)
{
_current = new ValueMatch(match.Index, match.Length);
_startAt = match.TextPosition;
_prevLen = match.Length;
return(true);
}
return(false);
}