source: branches/2994-AutoDiffForIntervals/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory-5.5.0/PatternMatching/AnyNodeOrNull.cs

//
// AnyNodeOrNull.cs
//
// Author:
//       Mike KrÃŒger <mkrueger@xamarin.com>
//
// Copyright (c) 2013 Xamarin Inc. (http://xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;

namespace ICSharpCode.NRefactory.PatternMatching
{
  /// <summary>
  /// Matches any node.
  /// </summary>
  /// <remarks>Does not match null nodes.</remarks>
  public class AnyNodeOrNull : Pattern
  {
    readonly string groupName;

    public string GroupName {
      get { return groupName; }
    }

    public AnyNodeOrNull(string groupName = null)
    {
      this.groupName = groupName;
    }

    public override bool DoMatch(INode other, Match match)
    {
      if (other == null) {
        match.AddNull(this.groupName);
      } else {
        match.Add(this.groupName, other);
      }
      return true;
    }
  }
}