public dynamic eval(Dictionary <string, Expr> env)
{
// look up in environment?
// if not in environment throw exception
if (env.ContainsKey(name))
{
return(env[name]);
}
else if (BuiltIn.Lookup(name))
{
return(new PrimFuncExpr(name).eval(env));
}
else
{
throw new EvaluatorException(String.Format("{0}: undefined", name));
}
}
public dynamic apply(List <Expr> parameters)
{
return(BuiltIn.Call(fun, parameters, env));
}