/// <summary> Determines equality by name and containing symbol. </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 Equals(ITypeSymbol x, ITypeSymbol y)
{
if (ReferenceEquals(x, y))
{
return(true);
}
if (x is null ||
y is null)
{
return(false);
}
if (x.TypeKind != y.TypeKind)
{
return(false);
}
if (x is INamedTypeSymbol xNamedType &&
y is INamedTypeSymbol yNamedType)
{
return(NamedTypeSymbolComparer.Equals(xNamedType, yNamedType));
}
if (x.TypeKind == TypeKind.TypeParameter)
{
return(x.MetadataName == y.MetadataName &&
SymbolComparer.Equals(x.ContainingSymbol, y.ContainingSymbol));
}
return(x.MetadataName == y.MetadataName &&
Equals(x.ContainingType, y.ContainingType) &&
NamespaceSymbolComparer.Equals(x.ContainingNamespace, y.ContainingNamespace));
}
/// <summary> Determines equality by name and containing symbol. </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 Equals(IParameterSymbol x, IParameterSymbol y)
{
if (ReferenceEquals(x, y))
{
return(true);
}
if (x is null ||
y is null)
{
return(false);
}
return(x.MetadataName == y.MetadataName &&
SymbolComparer.Equals(x.ContainingSymbol, y.ContainingSymbol));
}
public static bool IsSameType(this ITypeSymbol x, ITypeSymbol y)
{
if (Equals(x, y))
{
return(true);
}
if (x is null || y is null)
{
return(false);
}
if (x is ITypeParameterSymbol xtp)
{
if (y is ITypeParameterSymbol ytp)
{
return(xtp.MetadataName == ytp.MetadataName &&
SymbolComparer.Equals(xtp.ContainingSymbol, ytp.ContainingSymbol));
}
foreach (var constraintType in xtp.ConstraintTypes)
{
if (Is(constraintType, y))
{
return(true);
}
}
return(false);
}
else if (y is ITypeParameterSymbol ytp)
{
foreach (var constraintType in ytp.ConstraintTypes)
{
if (Is(x, constraintType))
{
return(true);
}
}
return(false);
}
return(x is INamedTypeSymbol firstNamed &&
y is INamedTypeSymbol otherNamed &&
IsSameType(firstNamed, otherNamed));
}