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source: branches/CodeEditor/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory-5.5.0/PatternMatching/Backreference.cs @ 11700

Last change on this file since 11700 was 11700, checked in by jkarder, 9 years ago

#2077: created branch and added first version

File size: 1.9 KB
Line 
1// Copyright (c) 2011-2013 AlphaSierraPapa for the SharpDevelop Team
2//
3// Permission is hereby granted, free of charge, to any person obtaining a copy of this
4// software and associated documentation files (the "Software"), to deal in the Software
5// without restriction, including without limitation the rights to use, copy, modify, merge,
6// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
7// to whom the Software is furnished to do so, subject to the following conditions:
8//
9// The above copyright notice and this permission notice shall be included in all copies or
10// substantial portions of the Software.
11//
12// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
13// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
14// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
15// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
16// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
17// DEALINGS IN THE SOFTWARE.
18
19using System;
20using System.Linq;
21
22namespace ICSharpCode.NRefactory.PatternMatching
23{
24  /// <summary>
25  /// Matches the last entry in the specified named group.
26  /// </summary>
27  public class Backreference : Pattern
28  {
29    readonly string referencedGroupName;
30   
31    public string ReferencedGroupName {
32      get { return referencedGroupName; }
33    }
34   
35    public Backreference(string referencedGroupName)
36    {
37      if (referencedGroupName == null)
38        throw new ArgumentNullException("referencedGroupName");
39      this.referencedGroupName = referencedGroupName;
40    }
41   
42    public override bool DoMatch(INode other, Match match)
43    {
44      var last = match.Get (referencedGroupName).Last ();
45      if (last == null && other == null)
46        return true;
47      return last.IsMatch(other);
48    }
49  }
50}
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