source: branches/2929_PrioritizedGrammarEnumeration/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Search/RegexSearchStrategy.cs @ 16147

// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
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// software and associated documentation files (the "Software"), to deal in the Software
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// 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;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows.Documents;
using ICSharpCode.AvalonEdit.Document;
using ICSharpCode.NRefactory.Editor;

namespace ICSharpCode.AvalonEdit.Search
{
  class RegexSearchStrategy : ISearchStrategy
  {
    readonly Regex searchPattern;
    readonly bool matchWholeWords;
    
    public RegexSearchStrategy(Regex searchPattern, bool matchWholeWords)
    {
      if (searchPattern == null)
        throw new ArgumentNullException("searchPattern");
      this.searchPattern = searchPattern;
      this.matchWholeWords = matchWholeWords;
    }
    
    public IEnumerable<ISearchResult> FindAll(ITextSource document, int offset, int length)
    {
      int endOffset = offset + length;
      foreach (Match result in searchPattern.Matches(document.Text)) {
        int resultEndOffset = result.Length + result.Index;
        if (offset > result.Index || endOffset < resultEndOffset)
          continue;
        if (matchWholeWords && (!IsWordBorder(document, result.Index) || !IsWordBorder(document, resultEndOffset)))
          continue;
        yield return new SearchResult { StartOffset = result.Index, Length = result.Length, Data = result };
      }
    }
    
    static bool IsWordBorder(ITextSource document, int offset)
    {
      return TextUtilities.GetNextCaretPosition(document, offset - 1, LogicalDirection.Forward, CaretPositioningMode.WordBorder) == offset;
    }
    
    public ISearchResult FindNext(ITextSource document, int offset, int length)
    {
      return FindAll(document, offset, length).FirstOrDefault();
    }
    
    public bool Equals(ISearchStrategy other)
    {
      var strategy = other as RegexSearchStrategy;
      return strategy != null &&
        strategy.searchPattern.ToString() == searchPattern.ToString() &&
        strategy.searchPattern.Options == searchPattern.Options &&
        strategy.searchPattern.RightToLeft == searchPattern.RightToLeft;
    }
  }
  
  class SearchResult : TextSegment, ISearchResult
  {
    public Match Data { get; set; }
    
    public string ReplaceWith(string replacement)
    {
      return Data.Result(replacement);
    }
  }
}