environment add_namespace(environment const & env, name const & ns) {
scope_mng_ext ext = get_extension(env);
if (!ext.m_namespace_set.contains(ns)) {
ext.m_namespace_set.insert(ns);
environment r = update(env, ext);
r = module::add(r, *g_new_namespace_key, [=](environment const &, serializer & s) { s << ns; });
if (ns.is_atomic())
return r;
else
return add_namespace(r, ns.get_prefix());
} else {
return env;
}
}
static bool is_explicit_placeholder(name const & n) {
return !n.is_atomic() && n.get_prefix() == *g_explicit_placeholder_name;
}
static bool is_placeholder(name const & n) {
if (n.is_atomic())
return false;
name const & p = n.get_prefix();
return p == *g_implicit_placeholder_name || p == *g_strict_placeholder_name || p == *g_explicit_placeholder_name;
}