private object LookUpVariable(Token name, Expr expr)
{
if (locals.TryGetValue(expr, out int distance))
{
return(environment.GetAt(distance, name.lexeme));
}
else
{
return(globals.Get(name));
}
}
public object Get(Token name)
{
if (values.TryGetValue(name.lexeme, out object value))
{
return(value);
}
if (enclosing != null)
{
return(enclosing.Get(name));
}
throw new RuntimeError(name, $"Undefined variable {name.lexeme}.");
}