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// Copyright (c) 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);
}
}
}
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