private static IEnumerable <IRFunctionSignatureHelp> MakeSignatures(IFunctionInfo functionInfo, ITrackingTextRange applicableToSpan, IRIntellisenseContext context)
{
var signatures = new List <IRFunctionSignatureHelp>();
if (functionInfo?.Signatures != null)
{
signatures.AddRange(functionInfo.Signatures.Select(s => RFunctionSignatureHelp.Create(context, functionInfo, s, applicableToSpan)));
context.Session.Properties["functionInfo"] = functionInfo;
}
return(signatures);
}
public static IRFunctionSignatureHelp Create(IRIntellisenseContext context, IFunctionInfo functionInfo, ISignatureInfo signatureInfo, ITrackingTextRange applicableSpan)
{
var sig = new RFunctionSignatureHelp(context.Session, context.EditorBuffer, functionInfo.Name, string.Empty, signatureInfo);
var paramList = new List <ISignatureParameterHelp>();
// Locus points in the pretty printed signature (the one displayed in the tooltip)
var locusPoints = new List <int>();
var signatureString = signatureInfo.GetSignatureString(functionInfo.Name, locusPoints);
sig.Content = signatureString;
sig.ApplicableToRange = applicableSpan;
sig.Documentation = functionInfo.Description?.Wrap(Math.Min(MaxSignatureLength, sig.Content.Length));
Debug.Assert(locusPoints.Count == signatureInfo.Arguments.Count + 1);
for (var i = 0; i < signatureInfo.Arguments.Count; i++)
{
var p = signatureInfo.Arguments[i];
if (p != null)
{
var locusStart = locusPoints[i];
var locusLength = locusPoints[i + 1] - locusStart;
Debug.Assert(locusLength >= 0);
var locus = new TextRange(locusStart, locusLength);
// VS may end showing very long tooltip so we need to keep
// description reasonably short: typically about
// same length as the function signature.
var description = p.Description.Wrap(Math.Min(MaxSignatureLength, sig.Content.Length));
paramList.Add(new RSignatureParameterHelp(description, locus, p.Name, sig));
}
}
sig.Parameters = new ReadOnlyCollection <ISignatureParameterHelp>(paramList);
sig.ComputeCurrentParameter(context.AstRoot, context.Position);
return(sig);
}