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Viewing changes to external/nrefactory/ICSharpCode.NRefactory/PatternMatching/OptionalNode.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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external/nrefactory/ICSharpCode.NRefactory/PatternMatching/OptionalNode.cs
 
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// Copyright (c) 2011-2013 AlphaSierraPapa for the SharpDevelop Team
 
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// 
 
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
 
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// software and associated documentation files (the "Software"), to deal in the Software
 
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// without restriction, including without limitation the rights to use, copy, modify, merge,
 
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
 
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// to whom the Software is furnished to do so, subject to the following conditions:
 
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// 
 
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// The above copyright notice and this permission notice shall be included in all copies or
 
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// substantial portions of the Software.
 
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// 
 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
 
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 
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// DEALINGS IN THE SOFTWARE.
 
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using System;
 
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using System.Collections.Generic;
 
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using System.Diagnostics;
 
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namespace ICSharpCode.NRefactory.PatternMatching
 
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{
 
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        public class OptionalNode : Pattern
 
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        {
 
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                readonly INode childNode;
 
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                public INode ChildNode {
 
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                        get { return childNode; }
 
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                }
 
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                public OptionalNode(INode childNode)
 
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                {
 
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                        if (childNode == null)
 
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                                throw new ArgumentNullException("childNode");
 
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                        this.childNode = childNode;
 
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                }
 
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                public OptionalNode(string groupName, INode childNode) : this(new NamedNode(groupName, childNode))
 
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                {
 
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                }
 
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                public override bool DoMatchCollection(Role role, INode pos, Match match, BacktrackingInfo backtrackingInfo)
 
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                {
 
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                        backtrackingInfo.backtrackingStack.Push(new PossibleMatch(pos, match.CheckPoint()));
 
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                        return childNode.DoMatch(pos, match);
 
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                }
 
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                public override bool DoMatch(INode other, Match match)
 
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                {
 
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                        if (other == null || other.IsNull)
 
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                                return true;
 
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                        else
 
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                                return childNode.DoMatch(other, match);
 
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                }
 
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        }
 
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}