public void SingleConsTest()
{
var symbol = new Symbol("abc");
var cons = new Cons(symbol, LispNull.Nil);
var enumerator = new ListEnumerator(cons);
Assert.IsTrue(enumerator.MoveNext());
Assert.AreSame(symbol, enumerator.Current);
Assert.IsFalse(enumerator.MoveNext());
}
public void AddBinding(Symbol symbol, LispObject value)
{
if (!dict.ContainsKey(symbol))
{
dict.Add(symbol, value);
}
else
{
throw new EnvironmentException(symbol + " already bound");
}
}
public bool TryLookUp(Symbol symbol, out LispObject value)
{
if (dict.TryGetValue(symbol, out value))
{
return true;
}
if (!this.IsRoot)
{
return this.parent.TryLookUp(symbol, out value);
}
return false;
}
public void SetValue(Symbol symbol, LispObject value)
{
if (dict.ContainsKey(symbol))
{
dict[symbol] = value;
}
else if (!IsRoot)
{
parent.SetValue(symbol, value);
}
else
{
throw new EnvironmentException("No binding for " + symbol);
}
}
public LispObject LookUp(Symbol symbol)
{
LispObject result;
if (!this.TryLookUp(symbol, out result))
{
throw new EnvironmentException("No binding for " + symbol);
}
return result;
}
private Symbol[] InternStars()
{
var name = string.Empty;
var symbols = new Symbol[3];
for (int i = 0; i < symbols.Length; i++)
{
name += "*";
symbols[i] = environment.Symbols.Intern(name);
}
return symbols;
}
