public Task ApplyTypedCharAsync(char @char, WorkSession session, ICommandResultSender sender, CancellationToken cancellationToken)
{
if (!session.IsRoslyn)
{
return(Task.CompletedTask);
}
var trigger = new SignatureHelpTriggerInfoData(SignatureHelpTriggerReason.TypeCharCommand, @char);
if (session.Roslyn.CurrentSignatureHelp != null)
{
var provider = session.Roslyn.CurrentSignatureHelp.Value.Provider;
if (provider.IsRetriggerCharacter(@char))
{
session.Roslyn.CurrentSignatureHelp = null;
return(SendSignatureHelpAsync(null, sender, cancellationToken));
}
return(TryApplySignatureHelpAsync(provider, trigger, session, sender, cancellationToken, sendIfEmpty: true));
}
return(TryApplySignatureHelpAsync(session, sender, cancellationToken, trigger));
}
private async Task <bool> TryApplySignatureHelpAsync(ISignatureHelpProviderWrapper provider, SignatureHelpTriggerInfoData trigger, WorkSession session, ICommandResultSender sender, CancellationToken cancellationToken, bool sendIfEmpty = false)
{
// ReSharper disable once PossibleInvalidOperationException
if (trigger.TriggerReason == SignatureHelpTriggerReason.TypeCharCommand && !provider.IsTriggerCharacter(trigger.TriggerCharacter.Value))
{
return(false);
}
var help = await provider.GetItemsAsync(session.Roslyn.Document, session.CursorPosition, trigger, cancellationToken).ConfigureAwait(false);
if (!sendIfEmpty && help == null)
{
return(false);
}
session.Roslyn.CurrentSignatureHelp = help != null ? new CurrentSignatureHelp(provider, help) : (CurrentSignatureHelp?)null;
await SendSignatureHelpAsync(help, sender, cancellationToken).ConfigureAwait(false);
return(true);
}
private async Task TryApplySignatureHelpAsync(WorkSession session, ICommandResultSender sender, CancellationToken cancellationToken, SignatureHelpTriggerInfoData trigger)
{
foreach (var provider in session.Roslyn.SignatureHelpProviders)
{
if (await TryApplySignatureHelpAsync(provider, trigger, session, sender, cancellationToken).ConfigureAwait(false))
{
return;
}
}
}
public Task ForceSignatureHelpAsync(WorkSession session, ICommandResultSender sender, CancellationToken cancellationToken)
{
var trigger = new SignatureHelpTriggerInfoData(SignatureHelpTriggerReason.InvokeSignatureHelpCommand);
return(TryApplySignatureHelpAsync(session, sender, cancellationToken, trigger));
}
