/NRefactory/ICSharpCode.NRefactory/PatternMatching/OptionalNode.cs
http://github.com/icsharpcode/ILSpy · C# · 58 lines · 34 code · 7 blank · 17 comment · 5 complexity · 3cbeb87b42c09d5b348f1796dc5a5c8d MD5 · raw file
- // Copyright (c) 2011-2013 AlphaSierraPapa for the SharpDevelop Team
- //
- // 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;
- using System.Collections.Generic;
- using System.Diagnostics;
- namespace ICSharpCode.NRefactory.PatternMatching
- {
- public class OptionalNode : Pattern
- {
- readonly INode childNode;
-
- public INode ChildNode {
- get { return childNode; }
- }
-
- public OptionalNode(INode childNode)
- {
- if (childNode == null)
- throw new ArgumentNullException("childNode");
- this.childNode = childNode;
- }
-
- public OptionalNode(string groupName, INode childNode) : this(new NamedNode(groupName, childNode))
- {
- }
-
- public override bool DoMatchCollection(Role role, INode pos, Match match, BacktrackingInfo backtrackingInfo)
- {
- backtrackingInfo.backtrackingStack.Push(new PossibleMatch(pos, match.CheckPoint()));
- return childNode.DoMatch(pos, match);
- }
-
- public override bool DoMatch(INode other, Match match)
- {
- if (other == null || other.IsNull)
- return true;
- else
- return childNode.DoMatch(other, match);
- }
- }
- }