/// <summary>
/// Returns an IEnumerable with the indices of the closest preceding non-empty tokens with increasingly lower indentation level.
/// </summary>
internal static IEnumerable <CodeFragment.TokenIndex> GetNonEmptyParents(this CodeFragment.TokenIndex tIndex)
{
for (var current = tIndex.GetNonEmptyParent(); current != null; current = current.GetNonEmptyParent())
{
yield return(current);
}
}
/// <summary>
/// Returns an IEnumerable with the indices of the closest preceding non-empty tokens with increasingly lower indentation level.
/// Throws an ArgumentNullException if tIndex is null.
/// </summary>
private static IEnumerable <CodeFragment.TokenIndex> GetNonEmptyParents(this CodeFragment.TokenIndex tIndex)
{
if (tIndex == null)
{
throw new ArgumentNullException(nameof(tIndex));
}
for (var current = tIndex.GetNonEmptyParent(); current != null; current = current.GetNonEmptyParent())
{
yield return(current);
}
}