public string[] GetSymbols(Type filter)
{
ArrayList s = new ArrayList();
foreach (DictionaryEntry de in hashtable)
{
if (de.Value.GetType() == filter)
{
s.Add(((Symbol)de.Key).Name);
}
}
if (previousEnvironment != null)
{
s.AddRange(previousEnvironment.GetSymbols(filter));
}
return(s.ToArray(typeof(string)) as string[]);
}