/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

  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. using System;
  19. using System.Collections.Generic;
  20. using System.Diagnostics;
  21. namespace ICSharpCode.NRefactory.PatternMatching
  22. {
  23. public class OptionalNode : Pattern
  24. {
  25. readonly INode childNode;
  26. public INode ChildNode {
  27. get { return childNode; }
  28. }
  29. public OptionalNode(INode childNode)
  30. {
  31. if (childNode == null)
  32. throw new ArgumentNullException("childNode");
  33. this.childNode = childNode;
  34. }
  35. public OptionalNode(string groupName, INode childNode) : this(new NamedNode(groupName, childNode))
  36. {
  37. }
  38. public override bool DoMatchCollection(Role role, INode pos, Match match, BacktrackingInfo backtrackingInfo)
  39. {
  40. backtrackingInfo.backtrackingStack.Push(new PossibleMatch(pos, match.CheckPoint()));
  41. return childNode.DoMatch(pos, match);
  42. }
  43. public override bool DoMatch(INode other, Match match)
  44. {
  45. if (other == null || other.IsNull)
  46. return true;
  47. else
  48. return childNode.DoMatch(other, match);
  49. }
  50. }
  51. }