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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.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 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();
}
}
}
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