Antlr4.Runtime.Tree.Pattern.ParseTreePatternMatcher.GetRuleTagToken C# (CSharp) Method

        protected internal virtual RuleTagToken GetRuleTagToken(IParseTree t)
        {
            if (t is IRuleNode)
            {
                IRuleNode r = (IRuleNode)t;
                if (r.ChildCount == 1 && r.GetChild(0) is ITerminalNode)
                {
                    ITerminalNode c = (ITerminalNode)r.GetChild(0);
                    if (c.Symbol is RuleTagToken)
                    {
                        //					System.out.println("rule tag subtree "+t.toStringTree(parser));
                        return (RuleTagToken)c.Symbol;
                    }
                }
            }
            return null;
        }