protected override Task <bool> IsValidOpenBraceTokenAtPositionAsync(Document document, SyntaxToken token, int position, CancellationToken cancellationToken)
{
// check what parser thinks about the newly typed "<" and only proceed if parser thinks it is "<" of
// type argument or parameter list
if (token.CheckParent <TypeParameterListSyntax>(n => n.LessThanToken == token) ||
token.CheckParent <TypeArgumentListSyntax>(n => n.LessThanToken == token) ||
token.CheckParent <FunctionPointerParameterListSyntax>(n => n.LessThanToken == token))
{
return(Task.FromResult(true));
}
// type argument can be easily ambiguous with normal < operations
if (token.Parent is not BinaryExpressionSyntax(SyntaxKind.LessThanExpression) node || node.OperatorToken != token)
{
return(Task.FromResult(false));
}
// type_argument_list only shows up in the following grammar construct:
//
// generic_name
// : identifier_token type_argument_list
//
// So if the prior token is not an identifier, this could not be a type-argument-list.
var previousToken = token.GetPreviousToken();
if (previousToken.Parent is not IdentifierNameSyntax identifier)
{
return(Task.FromResult(false));
}
return(IsSemanticTypeArgumentAsync(document, node.SpanStart, identifier, cancellationToken));
protected override async ValueTask <bool> IsValidOpenBraceTokenAtPositionAsync(Document document, SyntaxToken token, int position, CancellationToken cancellationToken)
{
// check what parser thinks about the newly typed "<" and only proceed if parser thinks it is "<" of
// type argument or parameter list
return(token.CheckParent <TypeParameterListSyntax>(n => n.LessThanToken == token) ||
token.CheckParent <TypeArgumentListSyntax>(n => n.LessThanToken == token) ||
token.CheckParent <FunctionPointerParameterListSyntax>(n => n.LessThanToken == token) ||
await PossibleTypeArgumentAsync(document, token, cancellationToken).ConfigureAwait(false));
}
