/// <summary>
/// Given a list of completion items that match the current code typed by the user,
/// returns the item that is considered the best match, and whether or not that
/// item should be selected or not.
///
/// itemToFilterText provides the values that each individual completion item should
/// be filtered against.
/// </summary>
public virtual ImmutableArray <CompletionItem> FilterItems(
Document document,
ImmutableArray <CompletionItem> items,
string filterText)
{
var helper = CompletionHelper.GetHelper(document);
return(FilterItems(helper, items, filterText));
}
internal static ImmutableArray <CompletionItem> FilterItems(
CompletionHelper completionHelper,
ImmutableArray <CompletionItem> items,
string filterText)
{
var bestItems = ArrayBuilder <CompletionItem> .GetInstance();
foreach (var item in items)
{
if (bestItems.Count == 0)
{
// We've found no good items yet. So this is the best item currently.
bestItems.Add(item);
}
else
{
var comparison = completionHelper.CompareItems(item, bestItems.First(), filterText, CultureInfo.CurrentCulture);
if (comparison < 0)
{
// This item is strictly better than the best items we've found so far.
bestItems.Clear();
bestItems.Add(item);
}
else if (comparison == 0)
{
// This item is as good as the items we've been collecting. We'll return
// it and let the controller decide what to do. (For example, it will
// pick the one that has the best MRU index).
bestItems.Add(item);
}
// otherwise, this item is strictly worse than the ones we've been collecting.
// We can just ignore it.
}
}
return(bestItems.ToImmutableAndFree());
}
private void CreateInstances()
{
this._caseSensitiveInstance = new CompletionHelper(isCaseSensitive: true);
this._caseInsensitiveInstance = new CompletionHelper(isCaseSensitive: false);
}