runtime/CSharp/src/Tree/Xpath/XPathWildcardElement.cs

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
using System.Collections.Generic;
using Antlr4.Runtime.Sharpen;
using Antlr4.Runtime.Tree;
using Antlr4.Runtime.Tree.Xpath;

namespace Antlr4.Runtime.Tree.Xpath
{
    public class XPathWildcardElement : XPathElement
    {
        public XPathWildcardElement()
            : base(XPath.Wildcard)
        {
        }

        public override ICollection<IParseTree> Evaluate(IParseTree t)
        {
            if (invert)
            {
                return new List<IParseTree>();
            }
            // !* is weird but valid (empty)
            IList<IParseTree> kids = new List<IParseTree>();
            foreach (ITree c in Trees.GetChildren(t))
            {
                kids.Add((IParseTree)c);
            }
            return kids;
        }
    }
}