private object lookupVariable(Token name, Expr expr)
{
if (locals.ContainsKey(expr))
{
return(environment.getAt(locals[expr], name.lexeme));
}
return(globals.get(name));
}
public object get(Token name)
{
if (values.ContainsKey(name.lexeme))
{
return(values[name.lexeme]);
}
if (enclosing != null)
{
return(enclosing.get(name));
}
throw new RuntimeError(name, $"Undefined variable '{name.lexeme}'.");
}