private bool TryClassifySymbol(
NameSyntax name,
ISymbol symbol,
SemanticModel semanticModel,
CancellationToken cancellationToken,
out ClassifiedSpan classifiedSpan)
{
// For Namespace parts, we want don't want to classify the QualifiedNameSyntax
// nodes, we instead wait for the each IdentifierNameSyntax node to avoid
// creating overlapping ClassifiedSpans.
if (symbol is INamespaceSymbol namespaceSymbol &&
name is IdentifierNameSyntax identifierNameSyntax)
{
// Do not classify the global:: namespace. It is already syntactically classified as a keyword.
var isGlobalNamespace = namespaceSymbol.IsGlobalNamespace &&
identifierNameSyntax.Identifier.IsKind(SyntaxKind.GlobalKeyword);
if (isGlobalNamespace)
{
classifiedSpan = default;
return(false);
}
// Classifies both extern aliases and namespaces.
classifiedSpan = new ClassifiedSpan(name.Span, ClassificationTypeNames.NamespaceName);
return(true);
}
if (name.IsNullWithNoType() &&
IsInVarContext(name))
{
var alias = semanticModel.GetAliasInfo(name, cancellationToken);
if (alias == null || alias.Name != "var")
{
if (!IsSymbolWithName(symbol, "var"))
{
// We bound to a symbol. If we bound to a symbol called "var" then we want to
// classify this appropriately as a type. Otherwise, we want to classify this as
// a keyword.
classifiedSpan = new ClassifiedSpan(name.Span, ClassificationTypeNames.Keyword);
return(true);
}
}
}
if (name.IsUnmanaged && name.Parent.IsKind(SyntaxKind.ImplementsTypeConstraint))
{
var alias = semanticModel.GetAliasInfo(name, cancellationToken);
if (alias == null || alias.Name != "unmanaged")
{
if (!IsSymbolWithName(symbol, "unmanaged"))
{
// We bound to a symbol. If we bound to a symbol called "unmanaged" then we want to
// classify this appropriately as a type. Otherwise, we want to classify this as
// a keyword.
classifiedSpan = new ClassifiedSpan(name.Span, ClassificationTypeNames.Keyword);
return(true);
}
}
}
// Use .Equals since we can't rely on object identity for constructed types.
SyntaxToken token;
switch (symbol)
{
case ITypeSymbol typeSymbol:
var classification = GetClassificationForType(typeSymbol);
if (classification != null)
{
token = name.GetNameToken();
classifiedSpan = new ClassifiedSpan(token.Span, classification);
return(true);
}
break;
case IFieldSymbol fieldSymbol:
token = name.GetNameToken();
classifiedSpan = new ClassifiedSpan(token.Span, GetClassificationForField(fieldSymbol));
return(true);
case IMethodSymbol methodSymbol:
token = name.GetNameToken();
classifiedSpan = new ClassifiedSpan(token.Span, GetClassificationForMethod(methodSymbol));
return(true);
case IPropertySymbol propertySymbol:
token = name.GetNameToken();
classifiedSpan = new ClassifiedSpan(token.Span, ClassificationTypeNames.PropertyName);
return(true);
case IEventSymbol eventSymbol:
token = name.GetNameToken();
classifiedSpan = new ClassifiedSpan(token.Span, ClassificationTypeNames.EventName);
return(true);
case IParameterSymbol parameterSymbol:
if (parameterSymbol.IsImplicitlyDeclared && parameterSymbol.Name == "value")
{
break;
}
token = name.GetNameToken();
classifiedSpan = new ClassifiedSpan(token.Span, ClassificationTypeNames.ParameterName);
return(true);
case ILocalSymbol localSymbol:
token = name.GetNameToken();
classifiedSpan = new ClassifiedSpan(token.Span, GetClassificationForLocal(localSymbol));
return(true);
case ILabelSymbol labelSymbol:
token = name.GetNameToken();
classifiedSpan = new ClassifiedSpan(token.Span, ClassificationTypeNames.LabelName);
return(true);
}
classifiedSpan = default;
return(false);
}