[11700] | 1 | // Copyright (c) 2011-2013 AlphaSierraPapa for the SharpDevelop Team |
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| 2 | // |
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| 3 | // Permission is hereby granted, free of charge, to any person obtaining a copy of this |
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| 4 | // software and associated documentation files (the "Software"), to deal in the Software |
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| 5 | // without restriction, including without limitation the rights to use, copy, modify, merge, |
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| 6 | // publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons |
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| 7 | // to whom the Software is furnished to do so, subject to the following conditions: |
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| 8 | // |
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| 9 | // The above copyright notice and this permission notice shall be included in all copies or |
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| 10 | // substantial portions of the Software. |
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| 11 | // |
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| 12 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
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| 13 | // INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR |
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| 14 | // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE |
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| 15 | // FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
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| 16 | // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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| 17 | // DEALINGS IN THE SOFTWARE. |
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| 18 | |
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| 19 | using System; |
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| 20 | using System.Linq; |
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| 21 | |
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| 22 | namespace ICSharpCode.NRefactory.PatternMatching |
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| 23 | { |
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| 24 | /// <summary> |
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| 25 | /// Matches the last entry in the specified named group. |
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| 26 | /// </summary> |
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| 27 | public class Backreference : Pattern |
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| 28 | { |
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| 29 | readonly string referencedGroupName; |
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| 30 | |
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| 31 | public string ReferencedGroupName { |
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| 32 | get { return referencedGroupName; } |
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| 33 | } |
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| 34 | |
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| 35 | public Backreference(string referencedGroupName) |
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| 36 | { |
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| 37 | if (referencedGroupName == null) |
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| 38 | throw new ArgumentNullException("referencedGroupName"); |
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| 39 | this.referencedGroupName = referencedGroupName; |
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| 40 | } |
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| 41 | |
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| 42 | public override bool DoMatch(INode other, Match match) |
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| 43 | { |
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| 44 | var last = match.Get (referencedGroupName).Last (); |
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| 45 | if (last == null && other == null) |
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| 46 | return true; |
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| 47 | return last.IsMatch(other); |
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| 48 | } |
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| 49 | } |
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| 50 | } |
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