/// <summary> Determines equality by name, containing type, arity and namespace. </summary>
/// <param name="x">The first instance.</param>
/// <param name="y">The other instance.</param>
/// <returns>True if the instances are found equal.</returns>
public static bool Equal(ITypeSymbol?x, ITypeSymbol?y)
{
if (ReferenceEquals(x, y))
{
return(true);
}
if (x is null || y is null)
{
return(false);
}
return(x.MetadataName == y.MetadataName &&
NamespaceSymbolComparer.Equal(x.ContainingNamespace, y.ContainingNamespace) &&
NullableAnnotation() &&
TypeArguments());
bool NullableAnnotation()
{
if (!x.IsReferenceType)
{
return(true);
}
return((x.NullableAnnotation, y.NullableAnnotation) switch
{
(Microsoft.CodeAnalysis.NullableAnnotation.None, _) => true,
(_, Microsoft.CodeAnalysis.NullableAnnotation.None) => true,
var(xa, ya) => xa == ya,
});
}
/// <summary> Determines equality by delegating to other compare. </summary>
/// <param name="x">The first instance.</param>
/// <param name="y">The other instance.</param>
/// <returns>True if the instances are found equal.</returns>
public static bool Equal(ISymbol?x, ISymbol?y)
{
if (ReferenceEquals(x, y))
{
return(true);
}
if (x is null ||
y is null ||
x.Kind != y.Kind ||
x.MetadataName != y.MetadataName)
{
return(false);
}
return((x.Kind, y.Kind) switch
{
(SymbolKind.Field, SymbolKind.Field) => FieldSymbolComparer.Equal((IFieldSymbol)x, (IFieldSymbol)y),
(SymbolKind.Event, SymbolKind.Event) => EventSymbolComparer.Equal((IEventSymbol)x, (IEventSymbol)y),
(SymbolKind.Property, SymbolKind.Property) => PropertySymbolComparer.Equal((IPropertySymbol)x, (IPropertySymbol)y),
(SymbolKind.Method, SymbolKind.Method) => MethodSymbolComparer.Equal((IMethodSymbol)x, (IMethodSymbol)y),
(SymbolKind.Parameter, SymbolKind.Parameter) => ParameterSymbolComparer.Equal((IParameterSymbol)x, (IParameterSymbol)y),
(SymbolKind.Local, SymbolKind.Local) => LocalSymbolComparer.Equal((ILocalSymbol)x, (ILocalSymbol)y),
(SymbolKind.NamedType, SymbolKind.NamedType) => NamedTypeSymbolComparer.Equal((INamedTypeSymbol)x, (INamedTypeSymbol)y),
(SymbolKind.ArrayType, SymbolKind.ArrayType) => TypeSymbolComparer.Equal((ITypeSymbol)x, (ITypeSymbol)y),
(SymbolKind.DynamicType, SymbolKind.DynamicType) => TypeSymbolComparer.Equal((ITypeSymbol)x, (ITypeSymbol)y),
(SymbolKind.ErrorType, SymbolKind.ErrorType) => false,
(SymbolKind.PointerType, SymbolKind.PointerType) => TypeSymbolComparer.Equal((ITypeSymbol)x, (ITypeSymbol)y),
(SymbolKind.TypeParameter, SymbolKind.TypeParameter) => TypeSymbolComparer.Equal((ITypeSymbol)x, (ITypeSymbol)y),
(SymbolKind.Namespace, SymbolKind.Namespace) => NamespaceSymbolComparer.Equal((INamespaceSymbol)x, (INamespaceSymbol)y),
(_, _) => SymbolEqualityComparer.Default.Equals(x, y),
});