source: branches/PersistentDataStructures/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory.CSharp-5.5.0/Refactoring/WordParser.cs

// 
// WordParser.cs
//  
// Author:
//       Michael Hutchinson <mhutch@xamarin.com>
// 
// Copyright (c) 2012 Xamarin Inc. (http://xamarin.com)
// 
// 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;

namespace ICSharpCode.NRefactory.CSharp
{
  public static class WordParser
  {
    public static List<string> BreakWords (string identifier)
    {
      var words = new List<string> ();
      int wordStart = 0;
      bool lastWasLower = false, lastWasUpper = false;
      for (int i = 0; i < identifier.Length; i++) {
        char c = identifier[i];
        var category = char.GetUnicodeCategory (c);
        if (category == System.Globalization.UnicodeCategory.LowercaseLetter) {
          if (lastWasUpper && (i - wordStart) > 2) {
            words.Add (identifier.Substring (wordStart, i - wordStart - 1));
            wordStart = i - 1;
          }
          lastWasLower = true;
          lastWasUpper = false;
        } else if (category == System.Globalization.UnicodeCategory.UppercaseLetter) {
          if (lastWasLower) {
            words.Add (identifier.Substring (wordStart, i - wordStart));
            wordStart = i;
          }
          lastWasLower = false;
          lastWasUpper = true;
        } else {
          if (c == '_') {
            if ((i - wordStart) > 0)
              words.Add(identifier.Substring(wordStart, i - wordStart));
            wordStart = i + 1;
            lastWasLower = lastWasUpper = false;
          }
        }
      }
      if (wordStart < identifier.Length)
        words.Add (identifier.Substring (wordStart));
      return words;
    }
  }
}