/// <summary>
/// Returns all the fragment strings that represent it.
/// "1;*;2;@(foo)" gets returned as ["1", "2", "*", "a", "b"], given that @(foo)=["a", "b"]
///
/// Order is not preserved. Globs are not expanded. Item expressions get replaced with their referring item instances.
/// </summary>
public IEnumerable <string> FlattenFragmentsAsStrings()
{
foreach (var valueString in Fragments.OfType <ValueFragment>().Select(v => v.ItemSpecFragment))
{
yield return(valueString);
}
foreach (var globString in Fragments.OfType <GlobFragment>().Select(g => g.ItemSpecFragment))
{
yield return(globString);
}
foreach (
var referencedItemString in
Fragments.OfType <ItemExpressionFragment <P, I> >().SelectMany(f => f.ReferencedItems).Select(v => v.ItemSpecFragment)
)
{
yield return(referencedItemString);
}
}