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// 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
{
/// <summary>
/// Matches one of several alternatives.
/// </summary>
public class Choice : Pattern, IEnumerable<INode>
{
readonly List<INode> alternatives = new List<INode>();
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<INode> IEnumerable<INode>.GetEnumerator()
{
return alternatives.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return alternatives.GetEnumerator();
}
}
}
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