async Task <ICompletionDataList> InternalHandleCodeCompletion(CodeCompletionContext completionContext, CompletionTriggerInfo triggerInfo, int triggerWordLength, CancellationToken token, bool forceSymbolCompletion = false)
{
var analysisDocument = DocumentContext.AnalysisDocument;
if (analysisDocument == null)
{
return(EmptyCompletionDataList);
}
var cs = DocumentContext.RoslynWorkspace.Services.GetLanguageServices(LanguageNames.CSharp).GetService <CompletionService> ();
SourceText sourceText;
if (!analysisDocument.TryGetText(out sourceText))
{
return(EmptyCompletionDataList);
}
CompletionTriggerKind kind;
switch (triggerInfo.CompletionTriggerReason)
{
case CompletionTriggerReason.CharTyped:
kind = CompletionTriggerKind.Insertion;
if (triggerInfo.TriggerCharacter == '{')
{
return(EmptyCompletionDataList);
}
break;
case CompletionTriggerReason.CompletionCommand:
kind = CompletionTriggerKind.InvokeAndCommitIfUnique;
break;
case CompletionTriggerReason.BackspaceOrDeleteCommand:
kind = CompletionTriggerKind.Deletion;
break;
case CompletionTriggerReason.RetriggerCommand:
kind = CompletionTriggerKind.InvokeAndCommitIfUnique;
break;
default:
kind = CompletionTriggerKind.Insertion;
break;
}
var triggerSnapshot = Editor.GetPlatformTextBuffer().CurrentSnapshot;
var trigger = new CompletionTrigger(kind, triggerInfo.TriggerCharacter.HasValue ? triggerInfo.TriggerCharacter.Value : '\0');
if (triggerInfo.CompletionTriggerReason == CompletionTriggerReason.CharTyped)
{
if (!cs.ShouldTriggerCompletion(sourceText, completionContext.TriggerOffset, trigger, null))
{
return(EmptyCompletionDataList);
}
}
completionContext.Trace("C#: Getting completions");
var customOptions = DocumentContext.RoslynWorkspace.Options
.WithChangedOption(CompletionOptions.TriggerOnDeletion, LanguageNames.CSharp, true)
.WithChangedOption(CompletionOptions.HideAdvancedMembers, LanguageNames.CSharp, IdeApp.Preferences.CompletionOptionsHideAdvancedMembers)
// Roslyn's implementation of this feature doesn't work correctly in old editor
.WithChangedOption(CompletionOptions.ShowItemsFromUnimportedNamespaces, LanguageNames.CSharp, false);
var completionList = await Task.Run(() => cs.GetCompletionsAsync(analysisDocument, Editor.CaretOffset, trigger, options: customOptions, cancellationToken: token)).ConfigureAwait(false);
completionContext.Trace("C#: Got completions");
if (completionList == null)
{
return(EmptyCompletionDataList);
}
var result = new CompletionDataList();
result.TriggerWordLength = triggerWordLength;
CSharpCompletionData defaultCompletionData = null;
bool first = true, addProtocolCompletion = false;
foreach (var item in completionList.Items)
{
if (string.IsNullOrEmpty(item.DisplayText))
{
continue;
}
var data = new CSharpCompletionData(analysisDocument, triggerSnapshot, cs, item);
if (first)
{
first = false;
addProtocolCompletion = data.Provider is OverrideCompletionProvider;
}
result.Add(data);
if (item.Rules.MatchPriority > 0)
{
if (defaultCompletionData == null || defaultCompletionData.Rules.MatchPriority < item.Rules.MatchPriority)
{
defaultCompletionData = data;
}
}
}
result.AutoCompleteUniqueMatch = (triggerInfo.CompletionTriggerReason == CompletionTriggerReason.CompletionCommand);
var partialDoc = analysisDocument.WithFrozenPartialSemantics(token);
var semanticModel = await partialDoc.GetSemanticModelAsync(token).ConfigureAwait(false);
var syntaxContext = CSharpSyntaxContext.CreateContext(DocumentContext.RoslynWorkspace, semanticModel, completionContext.TriggerOffset, token);
if (forceSymbolCompletion || IdeApp.Preferences.AddImportedItemsToCompletionList)
{
completionContext.Trace("C#: Adding import completion data");
AddImportCompletionData(syntaxContext, result, semanticModel, completionContext.TriggerOffset, token);
completionContext.Trace("C#: Added import completion data");
}
if (defaultCompletionData != null)
{
result.DefaultCompletionString = defaultCompletionData.DisplayText;
}
if (completionList.SuggestionModeItem != null)
{
if (completionList.Items.Contains(completionList.SuggestionModeItem))
{
result.DefaultCompletionString = completionList.SuggestionModeItem.DisplayText;
}
// if a suggestion mode item is present autoselection is disabled
// for example in the lambda case the suggestion mode item is '<lambda expression>' which is not part of the completion item list but taggs the completion list as auto select == false.
result.AutoSelect = false;
}
if (triggerInfo.TriggerCharacter == '_' && triggerWordLength == 1)
{
result.AutoSelect = false;
}
if (triggerInfo.TriggerCharacter == ' ')
{
result.AutoCompleteEmptyMatch = true;
}
return(result);
}