// 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; using System.Collections.Generic; namespace ICSharpCode.NRefactory.PatternMatching { /// /// Matches one of several alternatives. /// public class Choice : Pattern, IEnumerable { readonly List alternatives = new List(); public void Add(string name, INode alternative) { if (alternative == null) throw new ArgumentNullException("alternative"); alternatives.Add(new NamedNode(name, alternative)); } public void Add(INode alternative) { if (alternative == null) throw new ArgumentNullException("alternative"); alternatives.Add(alternative); } public override bool DoMatch(INode other, Match match) { var checkPoint = match.CheckPoint(); foreach (INode alt in alternatives) { if (alt.DoMatch(other, match)) return true; else match.RestoreCheckPoint(checkPoint); } return false; } IEnumerator IEnumerable.GetEnumerator() { return alternatives.GetEnumerator(); } IEnumerator IEnumerable.GetEnumerator() { return alternatives.GetEnumerator(); } } }