public override async Task <VSInternalInlineCompletionList?> HandleRequestAsync(VSInternalInlineCompletionRequest request, RequestContext context, CancellationToken cancellationToken)
{
Contract.ThrowIfNull(context.Document);
// First get available snippets if any.
var snippetInfoService = context.Document.Project.GetRequiredLanguageService <ISnippetInfoService>();
var snippetInfo = snippetInfoService.GetSnippetsIfAvailable();
if (!snippetInfo.Any())
{
return(null);
}
// Then attempt to get the word at the requested position.
var sourceText = await context.Document.GetTextAsync(cancellationToken).ConfigureAwait(false);
var syntaxFactsService = context.Document.Project.GetRequiredLanguageService <ISyntaxFactsService>();
var linePosition = ProtocolConversions.PositionToLinePosition(request.Position);
var position = sourceText.Lines.GetPosition(linePosition);
if (!SnippetUtilities.TryGetWordOnLeft(position, sourceText, syntaxFactsService, out var wordOnLeft))
{
return(null);
}
// Find the snippet with shortcut text that matches the typed word.
var wordText = sourceText.GetSubText(wordOnLeft.Value).ToString();
if (!BuiltInSnippets.Contains(wordText, StringComparer.OrdinalIgnoreCase))
{
return(null);
}
var matchingSnippetInfo = snippetInfo.First(s => wordText.Equals(s.Shortcut, StringComparison.OrdinalIgnoreCase));
var parsedSnippet = _xmlSnippetParser.GetParsedXmlSnippet(matchingSnippetInfo, context);
if (parsedSnippet == null)
{
return(null);
}
// Use the formatting options specified by the client to format the snippet.
var formattingOptions = await ProtocolConversions.GetFormattingOptionsAsync(request.Options, context.Document, cancellationToken).ConfigureAwait(false);
var formattedLspSnippet = await GetFormattedLspSnippetAsync(parsedSnippet, wordOnLeft.Value, context.Document, sourceText, formattingOptions, cancellationToken).ConfigureAwait(false);
return(new VSInternalInlineCompletionList
{
Items = new VSInternalInlineCompletionItem[]
{
new VSInternalInlineCompletionItem
{
Range = ProtocolConversions.TextSpanToRange(wordOnLeft.Value, sourceText),
Text = formattedLspSnippet,
TextFormat = InsertTextFormat.Snippet,
}
}
});
}
protected bool TryHandleTypedSnippet(ITextView textView, ITextBuffer subjectBuffer, CancellationToken cancellationToken)
{
AssertIsForeground();
var document = subjectBuffer.CurrentSnapshot.GetOpenDocumentInCurrentContextWithChanges();
if (document == null)
{
return(false);
}
var currentText = subjectBuffer.AsTextContainer().CurrentText;
var syntaxFactsService = document.GetLanguageService <ISyntaxFactsService>();
var endPositionInSubjectBuffer = textView.GetCaretPoint(subjectBuffer);
if (endPositionInSubjectBuffer == null)
{
return(false);
}
if (!SnippetUtilities.TryGetWordOnLeft(endPositionInSubjectBuffer.Value.Position, currentText, syntaxFactsService, out var span))
{
return(false);
}
if (!IsSnippetExpansionContext(document, span.Value.Start, cancellationToken))
{
return(false);
}
return(GetSnippetExpansionClient(textView, subjectBuffer).TryInsertExpansion(span.Value.Start, span.Value.End, cancellationToken));
}
