source: branches/2389-EpsLexicase/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Search/SearchStrategyFactory.cs

// Copyright (c) 2014 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.Text;
using System.Text.RegularExpressions;
using System.Windows.Controls;
using ICSharpCode.AvalonEdit.Document;

namespace ICSharpCode.AvalonEdit.Search
{
  /// <summary>
  /// Provides factory methods for ISearchStrategies.
  /// </summary>
  public static class SearchStrategyFactory
  {
    /// <summary>
    /// Creates a default ISearchStrategy with the given parameters.
    /// </summary>
    public static ISearchStrategy Create(string searchPattern, bool ignoreCase, bool matchWholeWords, SearchMode mode)
    {
      if (searchPattern == null)
        throw new ArgumentNullException("searchPattern");
      RegexOptions options = RegexOptions.Compiled | RegexOptions.Multiline;
      if (ignoreCase)
        options |= RegexOptions.IgnoreCase;
      
      switch (mode) {
        case SearchMode.Normal:
          searchPattern = Regex.Escape(searchPattern);
          break;
        case SearchMode.Wildcard:
          searchPattern = ConvertWildcardsToRegex(searchPattern);
          break;
      }
      try {
        Regex pattern = new Regex(searchPattern, options);
        return new RegexSearchStrategy(pattern, matchWholeWords);
      } catch (ArgumentException ex) {
        throw new SearchPatternException(ex.Message, ex);
      }
    }
    
    static string ConvertWildcardsToRegex(string searchPattern)
    {
      if (string.IsNullOrEmpty(searchPattern))
        return "";
      
      StringBuilder builder = new StringBuilder();
      
      foreach (char ch in searchPattern) {
        switch (ch) {
          case '?':
            builder.Append(".");
            break;
          case '*':
            builder.Append(".*");
            break;
          default:
            builder.Append(Regex.Escape(ch.ToString()));
            break;
        }
      }
      
      return builder.ToString();
    }
  }
}