public async Task <LSP.SignatureHelp?> HandleRequestAsync(LSP.TextDocumentPositionParams request, RequestContext context, CancellationToken cancellationToken)
{
var document = context.Document;
if (document == null)
{
return(null);
}
var position = await document.GetPositionFromLinePositionAsync(ProtocolConversions.PositionToLinePosition(request.Position), cancellationToken).ConfigureAwait(false);
var providers = _allProviders.Where(p => p.Metadata.Language == document.Project.Language);
var triggerInfo = new SignatureHelpTriggerInfo(SignatureHelpTriggerReason.InvokeSignatureHelpCommand);
var options = _globalOptions.GetSignatureHelpOptions(document.Project.Language);
foreach (var provider in providers)
{
var items = await provider.Value.GetItemsAsync(document, position, triggerInfo, options, cancellationToken).ConfigureAwait(false);
if (items != null)
{
var sigInfos = new ArrayBuilder <LSP.SignatureInformation>();
foreach (var item in items.Items)
{
LSP.SignatureInformation sigInfo;
if (context.ClientCapabilities?.HasVisualStudioLspCapability() == true)
{
sigInfo = new LSP.VSInternalSignatureInformation
{
ColorizedLabel = GetSignatureClassifiedText(item)
};
}
else
{
sigInfo = new LSP.SignatureInformation();
}
sigInfo.Label = GetSignatureText(item);
sigInfo.Documentation = new LSP.MarkupContent {
Kind = LSP.MarkupKind.PlainText, Value = item.DocumentationFactory(cancellationToken).GetFullText()
};
sigInfo.Parameters = item.Parameters.Select(p => new LSP.ParameterInformation
{
Label = p.Name,
Documentation = new LSP.MarkupContent {
Kind = LSP.MarkupKind.PlainText, Value = p.DocumentationFactory(cancellationToken).GetFullText()
}
}).ToArray();
sigInfos.Add(sigInfo);
}
var sigHelp = new LSP.SignatureHelp
{
ActiveSignature = GetActiveSignature(items),
ActiveParameter = items.ArgumentIndex,
Signatures = sigInfos.ToArrayAndFree()
};
return(sigHelp);
}
}
return(null);
}