private static bool MatchesFilterText(
CompletionHelper helper, CompletionItem item,
string filterText, CompletionTrigger trigger,
CompletionFilterReason filterReason, ImmutableArray <string> recentItems)
{
// For the deletion we bake in the core logic for how matching should work.
// This way deletion feels the same across all languages that opt into deletion
// as a completion trigger.
// Specifically, to avoid being too aggressive when matching an item during
// completion, we require that the current filter text be a prefix of the
// item in the list.
if (filterReason == CompletionFilterReason.Deletion &&
trigger.Kind == CompletionTriggerKind.Deletion)
{
return(item.FilterText.GetCaseInsensitivePrefixLength(filterText) > 0);
}
// If the user hasn't typed anything, and this item was preselected, or was in the
// MRU list, then we definitely want to include it.
if (filterText.Length == 0)
{
if (item.Rules.MatchPriority > MatchPriority.Default)
{
return(true);
}
if (!recentItems.IsDefault && GetRecentItemIndex(recentItems, item) <= 0)
{
return(true);
}
}
return(helper.MatchesFilterText(item, filterText, CultureInfo.CurrentCulture));
}
private static bool MatchesFilterText(CompletionHelper helper, CompletionItem item, SourceText text, Dictionary <TextSpan, string> textSpanToText, CompletionTrigger completionTrigger)
{
var filterText = GetFilterText(item, text, textSpanToText);
if (string.IsNullOrEmpty(filterText))
{
return(true);
}
return(helper.MatchesFilterText(item, filterText, completionTrigger));
}
private bool IsHardSelection(
Model model,
PresentationItem bestFilterMatch,
ITextSnapshot textSnapshot,
CompletionHelper completionRules,
CompletionTrigger trigger,
CompletionFilterReason reason)
{
if (model.SuggestionModeItem != null)
{
return(bestFilterMatch != null && bestFilterMatch.Item.DisplayText == model.SuggestionModeItem.Item.DisplayText);
}
if (bestFilterMatch == null || model.UseSuggestionMode)
{
return(false);
}
// We don't have a builder and we have a best match. Normally this will be hard
// selected, except for a few cases. Specifically, if no filter text has been
// provided, and this is not a preselect match then we will soft select it. This
// happens when the completion list comes up implicitly and there is something in
// the MRU list. In this case we do want to select it, but not with a hard
// selection. Otherwise you can end up with the following problem:
//
// dim i as integer =<space>
//
// Completion will comes up after = with 'integer' selected (Because of MRU). We do
// not want 'space' to commit this.
var viewSpan = model.GetViewBufferSpan(bestFilterMatch.Item.Span);
var fullFilterText = model.GetCurrentTextInSnapshot(viewSpan, textSnapshot, endPoint: null);
var shouldSoftSelect = completionRules.ShouldSoftSelectItem(bestFilterMatch.Item, fullFilterText, trigger);
if (shouldSoftSelect)
{
return(false);
}
// If the user moved the caret left after they started typing, the 'best' match may not match at all
// against the full text span that this item would be replacing.
if (!completionRules.MatchesFilterText(bestFilterMatch.Item, fullFilterText, trigger, reason, this.Controller.GetRecentItems()))
{
return(false);
}
// There was either filter text, or this was a preselect match. In either case, we
// can hard select this.
return(true);
}
private static bool MatchesFilterText(
CompletionHelper helper, CompletionItem item,
string filterText, CompletionTrigger trigger,
CompletionFilterReason filterReason, ImmutableArray <string> recentItems)
{
// For the deletion we bake in the core logic for how matching should work.
// This way deletion feels the same across all languages that opt into deletion
// as a completion trigger.
// Specifically, to avoid being too aggressive when matching an item during
// completion, we require that the current filter text be a prefix of the
// item in the list.
if (filterReason == CompletionFilterReason.BackspaceOrDelete &&
trigger.Kind == CompletionTriggerKind.Deletion)
{
return(item.FilterText.GetCaseInsensitivePrefixLength(filterText) > 0);
}
return(helper.MatchesFilterText(item, filterText, trigger, recentItems));
}
