/// <summary>
/// Imports a namespace from another compilation.
/// </summary>
/// <remarks>
/// This method may return null if the namespace does not exist in the target compilation.
/// </remarks>
public static INamespace Import(this ICompilation compilation, INamespace ns)
{
if (compilation == null)
{
throw new ArgumentNullException("compilation");
}
if (ns == null)
{
return(null);
}
if (ns.ParentNamespace == null)
{
// root namespace
return(compilation.GetNamespaceForExternAlias(ns.ExternAlias));
}
else
{
INamespace parent = Import(compilation, ns.ParentNamespace);
if (parent != null)
{
return(parent.GetChildNamespace(ns.Name));
}
else
{
return(null);
}
}
}
