static async Task <CompletionModel> ComputeModelAsync(
RoslynCompilationWorkspace compilationWorkspace,
SourceText text,
int position,
CancellationToken ct)
{
ct.ThrowIfCancellationRequested();
var completions = await compilationWorkspace.CompletionService.GetCompletionsAsync(
compilationWorkspace.GetSubmissionDocument(text.Container),
position,
options : compilationWorkspace.Options,
cancellationToken : ct).ConfigureAwait(false);
if (completions == null)
{
return(null);
}
// TODO: Default tracking span
//var trackingSpan = await _completionService.GetDefaultTrackingSpanAsync(_documentOpt, _subjectBufferCaretPosition, cancellationToken).ConfigureAwait(false);
return(CompletionModel.CreateModel(
text,
default(TextSpan),
completions.Items));
}
void OnCompletionModelUpdated(CompletionModel model)
{
if (model == null)
{
StopComputation();
return;
}
if (lastCompletionModel == model)
{
return;
}
lastCompletionModel = model;
}
/// <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);
}
RoslynCompletionItem bestFilterMatch = null;
var bestFilterMatchIndex = 0;
var document = compilationWorkspace.GetSubmissionDocument(sourceText.Container);
var newFilteredCompletions = new List <RoslynCompletionItem> ();
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].ToDisplayString(Constants.SymbolDisplayFormat);
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));
}