public override bool Parse(IItemFactory itemFactory, ITextProvider text, ITokenStream stream)
        {
            if (AtRule.IsRule(text, stream, "extend"))
            {
                Rule = AtRule.CreateParsed(itemFactory, text, stream);
                if (Rule != null)
                {
                    Children.Add(Rule);
                }

                var selector = itemFactory.CreateSpecific <SelectorGroup>(this, text, stream);
                if (selector.Parse(itemFactory, text, stream))
                {
                    Selector = selector;
                    Children.Add(selector);
                }

                if (stream.Current.Type == TokenType.Bang)
                {
                    var modifier = new OptionalModifier();
                    if (modifier.Parse(itemFactory, text, stream))
                    {
                        Modifier = modifier;
                        Children.Add(modifier);
                    }
                }

                if (stream.Current.Type == TokenType.Semicolon)
                {
                    Semicolon = Children.AddCurrentAndAdvance(stream, SassClassifierType.Punctuation);
                }
            }

            return(Children.Count > 0);
        }
        public override bool Parse(IItemFactory itemFactory, ITextProvider text, ITokenStream stream)
        {
            if (AtRule.IsRule(text, stream, "extend"))
            {
                Rule = AtRule.CreateParsed(itemFactory, text, stream);
                if (Rule != null)
                    Children.Add(Rule);

                var selector = itemFactory.CreateSpecific<SelectorGroup>(this, text, stream);
                if (selector.Parse(itemFactory, text, stream))
                {
                    Selector = selector;
                    Children.Add(selector);
                }

                if (stream.Current.Type == TokenType.Bang)
                {
                    var modifier = new OptionalModifier();
                    if (modifier.Parse(itemFactory, text, stream))
                    {
                        Modifier = modifier;
                        Children.Add(modifier);
                    }
                }

                if (stream.Current.Type == TokenType.Semicolon)
                    Semicolon = Children.AddCurrentAndAdvance(stream, SassClassifierType.Punctuation);
            }

            return Children.Count > 0;
        }