internal static bool SupportsLanguageFeature(this Document document, CSharpLanguageFeature feature)
{
switch (feature)
{
case CSharpLanguageFeature.Unknown:
return(false);
case CSharpLanguageFeature.NameOf:
return(SupportsLanguageVersion(document, LanguageVersion.CSharp6));
case CSharpLanguageFeature.AsyncMain:
case CSharpLanguageFeature.DefaultLiteral:
case CSharpLanguageFeature.InferredTupleElementNames:
case CSharpLanguageFeature.PatternMatchingWithGenerics:
return(SupportsLanguageVersion(document, LanguageVersion.CSharp7_1));
case CSharpLanguageFeature.NullCoalescingAssignmentOperator:
return(SupportsLanguageVersion(document, LanguageVersion.CSharp8));
case CSharpLanguageFeature.NotPattern:
return(SupportsLanguageVersion(document, LanguageVersion.CSharp9));
}
throw new ArgumentException($"Unknown enum value '{feature}'.", nameof(feature));
}
internal static bool SupportsLanguageFeature(this Document document, CSharpLanguageFeature feature)
{
switch (feature)
{
case CSharpLanguageFeature.Unknown:
return(false);
case CSharpLanguageFeature.AsyncMain:
case CSharpLanguageFeature.DefaultLiteral:
case CSharpLanguageFeature.InferredTupleElementNames:
case CSharpLanguageFeature.PatternMatchingWithGenerics:
return(((CSharpParseOptions)document.Project.ParseOptions).LanguageVersion >= LanguageVersion.CSharp7_1);
}
throw new ArgumentException($"Unknown enum value '{feature}'.", nameof(feature));
}
