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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;
namespace ICSharpCode.NRefactory.PatternMatching
{
/// <summary>
/// AST node that supports pattern matching.
/// </summary>
public interface INode
{
Role Role { get; }
INode FirstChild { get; }
INode NextSibling { get; }
bool IsNull { get; }
bool DoMatch(INode other, Match match);
bool DoMatchCollection(Role role, INode pos, Match match, BacktrackingInfo backtrackingInfo);
}
public static class PatternExtensions
{
/// <summary>
/// Performs a pattern matching operation.
/// <c>this</c> is the pattern, <paramref name="other"/> is the AST that is being matched.
/// </summary>
/// <returns>
/// A match object. Check <see cref="PatternMatching.Match.Success"/> to see whether the match was successful.
/// </returns>
/// <remarks>
/// Patterns are ASTs that contain special pattern nodes (from the PatternMatching namespace).
/// However, it is also possible to match two ASTs without any pattern nodes -
/// doing so will produce a successful match if the two ASTs are structurally identical.
/// </remarks>
public static Match Match(this INode pattern, INode other)
{
if (pattern == null)
throw new ArgumentNullException("pattern");
Match match = PatternMatching.Match.CreateNew();
if (pattern.DoMatch(other, match))
return match;
else
return default(PatternMatching.Match);
}
public static bool IsMatch(this INode pattern, INode other)
{
if (pattern == null)
throw new ArgumentNullException("pattern");
return pattern.DoMatch(other, PatternMatching.Match.CreateNew());
}
}
}
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