public async Task <LSP.CompletionItem> HandleRequestAsync(LSP.CompletionItem completionItem, RequestContext context, CancellationToken cancellationToken)
{
var document = context.Document;
if (document == null)
{
return(completionItem);
}
var completionService = document.Project.LanguageServices.GetRequiredService <CompletionService>();
var data = GetCompletionResolveData(completionItem);
CompletionList?list = null;
// See if we have a cache of the completion list we need
if (data.ResultId.HasValue)
{
list = await _completionListCache.GetCachedCompletionListAsync(data.ResultId.Value, cancellationToken).ConfigureAwait(false);
}
if (list == null)
{
// We don't have a cache, so we need to recompute the list
var position = await document.GetPositionFromLinePositionAsync(ProtocolConversions.PositionToLinePosition(data.Position), cancellationToken).ConfigureAwait(false);
var completionOptions = await CompletionHandler.GetCompletionOptionsAsync(document, cancellationToken).ConfigureAwait(false);
list = await completionService.GetCompletionsAsync(document, position, data.CompletionTrigger, options : completionOptions, cancellationToken : cancellationToken).ConfigureAwait(false);
if (list == null)
{
return(completionItem);
}
}
// Find the matching completion item in the completion list
var selectedItem = list.Items.FirstOrDefault(
i => data.DisplayText == i.DisplayText &&
completionItem.Label.StartsWith(i.DisplayTextPrefix) &&
completionItem.Label.EndsWith(i.DisplayTextSuffix));
if (selectedItem == null)
{
return(completionItem);
}
var description = await completionService.GetDescriptionAsync(document, selectedItem, cancellationToken).ConfigureAwait(false);
if (completionItem is LSP.VSCompletionItem vsCompletionItem)
{
vsCompletionItem.Description = new ClassifiedTextElement(description.TaggedParts
.Select(tp => new ClassifiedTextRun(tp.Tag.ToClassificationTypeName(), tp.Text)));
}
// We compute the TextEdit resolves for complex text edits (e.g. override and partial
// method completions) here. Lazily resolving TextEdits is technically a violation of
// the LSP spec, but is currently supported by the VS client anyway. Once the VS client
// adheres to the spec, this logic will need to change and VS will need to provide
// official support for TextEdit resolution in some form.
if (selectedItem.IsComplexTextEdit)
{
Contract.ThrowIfTrue(completionItem.InsertText != null);
Contract.ThrowIfTrue(completionItem.TextEdit != null);
var snippetsSupported = context.ClientCapabilities.TextDocument?.Completion?.CompletionItem?.SnippetSupport ?? false;
completionItem.TextEdit = await GenerateTextEditAsync(
document, completionService, selectedItem, snippetsSupported, cancellationToken).ConfigureAwait(false);
}
completionItem.Detail = description.TaggedParts.GetFullText();
return(completionItem);
}
public async Task <LSP.CompletionItem> HandleRequestAsync(LSP.CompletionItem completionItem, RequestContext context, CancellationToken cancellationToken)
{
var document = context.Document;
if (document == null)
{
return(completionItem);
}
var completionService = document.Project.LanguageServices.GetRequiredService <CompletionService>();
var data = GetCompletionResolveData(completionItem);
CompletionList?list = null;
// See if we have a cache of the completion list we need
if (data.ResultId.HasValue)
{
list = await _completionListCache.GetCachedCompletionListAsync(data.ResultId.Value, cancellationToken).ConfigureAwait(false);
}
if (list == null)
{
// We don't have a cache, so we need to recompute the list
var position = await document.GetPositionFromLinePositionAsync(ProtocolConversions.PositionToLinePosition(data.Position), cancellationToken).ConfigureAwait(false);
var completionOptions = await CompletionHandler.GetCompletionOptionsAsync(document, cancellationToken).ConfigureAwait(false);
list = await completionService.GetCompletionsAsync(document, position, data.CompletionTrigger, options : completionOptions, cancellationToken : cancellationToken).ConfigureAwait(false);
if (list == null)
{
return(completionItem);
}
}
var selectedItem = list.Items.FirstOrDefault(i => i.DisplayText == data.DisplayText);
if (selectedItem == null)
{
return(completionItem);
}
var description = await completionService.GetDescriptionAsync(document, selectedItem, cancellationToken).ConfigureAwait(false);
var lspVSClientCapability = context.ClientCapabilities?.HasVisualStudioLspCapability() == true;
LSP.CompletionItem resolvedCompletionItem;
if (lspVSClientCapability)
{
resolvedCompletionItem = CloneVSCompletionItem(completionItem);
((LSP.VSCompletionItem)resolvedCompletionItem).Description = new ClassifiedTextElement(description.TaggedParts
.Select(tp => new ClassifiedTextRun(tp.Tag.ToClassificationTypeName(), tp.Text)));
}
else
{
resolvedCompletionItem = RoslynCompletionItem.From(completionItem);
((RoslynCompletionItem)resolvedCompletionItem).Description = description.TaggedParts.Select(
tp => new RoslynTaggedText {
Tag = tp.Tag, Text = tp.Text
}).ToArray();
}
resolvedCompletionItem.Detail = description.TaggedParts.GetFullText();
return(resolvedCompletionItem);
}