source: stable/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory-5.5.0/PatternMatching/Match.cs

// 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
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// 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
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using System;
using System.Collections.Generic;
using System.Linq;

namespace ICSharpCode.NRefactory.PatternMatching
{
  /// <summary>
  /// Represents the result of a pattern matching operation.
  /// </summary>
  public struct Match
  {
    // TODO: maybe we should add an implicit Match->bool conversion? (implicit operator bool(Match m) { return m != null; })
    
    List<KeyValuePair<string, INode>> results;
    
    public bool Success {
      get { return results != null; }
    }
    
    internal static Match CreateNew()
    {
      Match m;
      m.results = new List<KeyValuePair<string, INode>>();
      return m;
    }
    
    internal int CheckPoint()
    {
      return results.Count;
    }
    
    internal void RestoreCheckPoint(int checkPoint)
    {
      results.RemoveRange(checkPoint, results.Count - checkPoint);
    }
    
    public IEnumerable<INode> Get(string groupName)
    {
      if (results == null)
        yield break;
      foreach (var pair in results) {
        if (pair.Key == groupName)
          yield return pair.Value;
      }
    }
    
    public IEnumerable<T> Get<T>(string groupName) where T : INode
    {
      if (results == null)
        yield break;
      foreach (var pair in results) {
        if (pair.Key == groupName)
          yield return (T)pair.Value;
      }
    }
    
    public bool Has(string groupName)
    {
      if (results == null)
        return false;
      foreach (var pair in results) {
        if (pair.Key == groupName)
          return true;
      }
      return false;
    }
    
    public void Add(string groupName, INode node)
    {
      if (groupName != null && node != null) {
        results.Add(new KeyValuePair<string, INode>(groupName, node));
      }
    }

    internal void AddNull (string groupName)
    {
      if (groupName != null) {
        results.Add(new KeyValuePair<string, INode>(groupName, null));
      }
    }
  }
}