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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows.Documents;
using Tango.Scripting.Editors.Document;
namespace Tango.Scripting.Editors.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);
}
}
}
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