source: branches/RemoveBackwardsCompatibility/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory-5.5.0/PatternMatching/INode.cs @ 14815

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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());
    }
  }
}