BlogEngine.Core/Search.cs

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#region Using

using System;
using System.IO;
using System.Text;
using System.Web;
using System.Xml;
using System.Collections.ObjectModel;
using System.Collections.Generic;
using System.Collections.Specialized;
using BlogEngine.Core;
using System.Text.RegularExpressions;

#endregion

namespace BlogEngine.Core
{
	/// <summary>
	/// Searches the post collection and returns a result based on a search term.
	/// <remarks>It is used for related posts and the in-site search feature.</remarks>
	/// </summary>
	public static class Search
	{

		static Search()
		{
			BuildCatalog();
			Post.Saved += new EventHandler<SavedEventArgs>(Post_Saved);
			Page.Saved += new EventHandler<SavedEventArgs>(Page_Saved);
			BlogSettings.Changed += delegate { BuildCatalog(); };
			Post.CommentAdded += new EventHandler<EventArgs>(Post_CommentAdded);
			Post.CommentRemoved += delegate { BuildCatalog(); };
			Comment.Approved += new EventHandler<EventArgs>(Post_CommentAdded);
		}

		#region Event handlers

		/// <summary>
		/// Adds a post to the catalog when it is added.
		/// </summary>
		private static void Post_Saved(object sender, SavedEventArgs e)
		{
			lock (_SyncRoot)
			{
				if (e.Action == SaveAction.Insert)
				{
					AddItem(sender as Post);
				}
				else
				{
					BuildCatalog();
				}
			}
		}

		private static void Page_Saved(object sender, SavedEventArgs e)
		{
			lock (_SyncRoot)
			{
				if (e.Action == SaveAction.Insert)