public virtual CSharpTypeKind ToCSharpKind(LanguageTypeKind kind)
{
switch (kind.Switch())
{
case LanguageTypeKind.None:
return(CSharpTypeKind.Unknown);
case LanguageTypeKind.Module:
return(CSharpTypeKind.Module);
case LanguageTypeKind.NamedType:
return(CSharpTypeKind.Class);
case LanguageTypeKind.Enum:
return(CSharpTypeKind.Enum);
case LanguageTypeKind.Error:
return(CSharpTypeKind.Error);
case LanguageTypeKind.Dynamic:
return(CSharpTypeKind.Dynamic);
case LanguageTypeKind.Constructed:
return(CSharpTypeKind.Unknown);
default:
throw new ArgumentException("Unexpected type kind: " + kind.ToString(), nameof(kind));
}
}
// Get the type kind of a symbol, going to candidates if possible.
internal static LanguageTypeKind ExtractNonErrorTypeKind(TypeSymbol oldSymbol)
{
if (oldSymbol.TypeKind != LanguageTypeKind.Error)
{
return(oldSymbol.TypeKind);
}
// At this point, we know that oldSymbol is a non-null type symbol with kind error.
// Hence, it is either an ErrorTypeSymbol or it has an ErrorTypeSymbol as its
// original definition. In the former case, it is its own original definition.
// Thus, if there's a CSErrorTypeSymbol in there somewhere, it's returned by
// OriginalDefinition.
ExtendedErrorTypeSymbol oldError = oldSymbol.OriginalDefinition as ExtendedErrorTypeSymbol;
// If the original definition isn't a CSErrorTypeSymbol, then we don't know how to
// pull out a non-error type. If it is, then if there is a unambiguous type inside it,
// use that.
LanguageTypeKind commonTypeKind = LanguageTypeKind.Error;
if ((object)oldError != null && !oldError._candidateSymbols.IsDefault && oldError._candidateSymbols.Length > 0)
{
foreach (Symbol sym in oldError._candidateSymbols)
{
TypeSymbol type = sym as TypeSymbol;
if ((object)type != null && type.TypeKind != LanguageTypeKind.Error)
{
if (commonTypeKind == LanguageTypeKind.Error)
{
commonTypeKind = type.TypeKind;
}
else if (commonTypeKind != type.TypeKind)
{
return(LanguageTypeKind.Error); // no common kind.
}
}
}
}
return(commonTypeKind);
}