internal static bool MatchesFilterText(
CompletionHelper helper, RoslynCompletionItem item,
string filterText, CompletionTriggerKind initialTriggerKind,
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 &&
initialTriggerKind == 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 && ItemManager.GetRecentItemIndex(recentItems, item) <= 0)
{
return(true);
}
}
// Checks if the given completion item matches the pattern provided so far.
// A completion item is checked against the pattern by see if it's
// CompletionItem.FilterText matches the item. That way, the pattern it checked
// against terms like "IList" and not IList<>
return(helper.MatchesPattern(item.FilterText, filterText, CultureInfo.CurrentCulture));
}
/// <summary>
/// Filter currentCompletionList according to the current filter text. Roslyn's completion does not
/// handle this automatically.
/// </summary>
static async Task <CompletionModel> FilterModelAsync(
RoslynCompilationWorkspace compilationWorkspace,
SourceText sourceText,
CompletionModel model,
CompletionHelper helper,
CancellationToken ct)
{
if (model == null)
{
return(null);
}
CompletionItem bestFilterMatch = null;
var bestFilterMatchIndex = 0;
var document = compilationWorkspace.GetSubmissionDocument(sourceText.Container);
var newFilteredCompletions = new List <CompletionItem> ();
foreach (var item in model.TotalItems)
{
var completion = item;
// TODO: Better range checking on delete before queuing up filtering (see TODO in HandleChange)
if (completion.Span.Start > sourceText.Length)
{
continue;
}
var filterText = GetFilterText(sourceText, completion);
// CompletionRules.MatchesFilterText seems to always return false when filterText is
// empty.
if (filterText != String.Empty && !helper.MatchesPattern(
completion.FilterText,
filterText,
CultureInfo.CurrentCulture))
{
continue;
}
var itemDetail = String.Empty;
var symbols = await SymbolCompletionItem.GetSymbolsAsync(completion, document, ct)
.ConfigureAwait(false);
var overloads = symbols.OfType <IMethodSymbol> ().ToArray();
if (overloads.Length > 0)
{
itemDetail = overloads [0].ToMonacoSignatureString();
if (overloads.Length > 1)
{
itemDetail += $" (+ {overloads.Length - 1} overload(s))";
}
}
completion = completion.AddProperty(itemDetailPropertyName, itemDetail);
newFilteredCompletions.Add(completion);
if (bestFilterMatch == null || helper.CompareItems(
completion,
bestFilterMatch,
filterText,
CultureInfo.CurrentCulture) > 0)
{
bestFilterMatch = completion;
bestFilterMatchIndex = newFilteredCompletions.Count - 1;
}
}
if (newFilteredCompletions.Count == 0)
{
return(null);
}
return(model
.WithFilteredItems(newFilteredCompletions)
.WithSelectedItem(bestFilterMatch, bestFilterMatchIndex)
.WithText(sourceText));
}
// ref: RoslynPad -- https://github.com/aelij/RoslynPad
private static bool MatchesFilterText(CompletionHelper helper, CompletionItem item, SourceText text, Dictionary <TextSpan, string> textSpanToText)
{
var filterText = GetFilterText(item, text, textSpanToText);
return(string.IsNullOrEmpty(filterText) || helper.MatchesPattern(item.FilterText, filterText, CultureInfo.InvariantCulture));
}
