root/lang/csharp/IrcSendOnly/ChatLogger.cs

using System;
using System.IO;
using System.Xml;
using System.Collections;
using System.Text.RegularExpressions;

namespace IrcSend
{
        public class ChatLogger : IDisposable
        {
                private string mFileName;
                private XmlDocument mDocument;
                private XmlElement mBodyElement;
                private Hashtable mChannelsMap;
                int mFlushCount;

                private static Regex LinkRegex = new Regex("https?://[/0-9a-zA-Z%+.$,;:&=?!*~@#_()\\-]+", RegexOptions.Singleline | RegexOptions.Compiled);

                public ChatLogger(string filename)
                {
                        mFlushCount = 10;
                        mFileName = filename;

                        if (!File.Exists(filename))
                                initLogFile();

                        XmlDocument doc = new XmlDocument();
                        doc.Load(filename);

                        XmlNodeList bodies = doc.GetElementsByTagName("body");
                        if (bodies.Count == 0)
                                throw new Exception("Log html doesn't have body!");

                        XmlElement body = bodies[0] as XmlElement;

                        mDocument = doc;
                        mBodyElement = body;
                        mChannelsMap = new Hashtable();

                        scanChannelSections();
                }

                public void flush()
                {
                        if (mDocument != null)
                                mDocument.Save(mFileName);

                        mFlushCount = 10;
                }

                public void addChannelMessage(string chname, string nick, string message)
                {
                        lock(this)
                        {
                                if (!mChannelsMap.ContainsKey(chname))
                                        createChannelSection(chname);

                                ChannelSection sobj = (ChannelSection)mChannelsMap[chname];

                                XmlElement li  = mDocument.CreateElement("li");

                                DateTime now = DateTime.Now;
                
                                string min = now.Minute.ToString();
                                if (min.Length == 1)
                                        min = "0"+min;

                                string tm = now.Hour.ToString() +":"+  min;

                                Match mch = LinkRegex.Match(message);
                                if (mch == null || mch.Value.Length == 0)
                                        li.InnerText = tm+" "+nick+"> "+message;
                                else
                                {
                                        message = message.Replace("&", "&amp;").Replace("<", "&lt;").Replace(">", "&gt;");
                                        string url = mch.Value.Replace("&", "&amp;").Replace("<", "&lt;").Replace(">", "&gt;");
                                        message = message.Replace(url, "<a href=\""+url+"\">"+url+"</a>");

                                        li.InnerXml = tm+" "+nick+"&gt; "+message;
                                }

                                sobj.posts_list.AppendChild(li);

                                if (--mFlushCount < 1)
                                        flush();
                        }
                }

                private void createChannelSection(string chname)
                {
                        XmlElement div = mDocument.CreateElement("div");
                        XmlElement ul  = mDocument.CreateElement("ul");
                        XmlElement h2  = mDocument.CreateElement("h2");

                        div.SetAttribute("class", "channel");
                        h2.InnerText = chname;
                        div.AppendChild(h2);
                        div.AppendChild(ul);

                        mBodyElement.AppendChild(div);

                        ChannelSection sobj = new ChannelSection();
                        sobj.heading = h2;
                        sobj.posts_list = ul;
                        sobj.section = div;

                        mChannelsMap[chname] = sobj;
                }

                private void scanChannelSections()
                {
                        int len = mBodyElement.ChildNodes.Count;
                        for (int i = 0;i < len;i++)
                        {
                                XmlNode n = mBodyElement.ChildNodes.Item(i);
                                if (n.NodeType == XmlNodeType.Element)
                                {
                                        XmlElement el = n as XmlElement;
                                        if (el.LocalName.Equals("div") && el.GetAttribute("class").Equals("channel"))
                                        {
                                                XmlNodeList h2s = el.GetElementsByTagName("h2");
                                                if (h2s.Count > 0)
                                                {
                                                        XmlElement h2 = h2s.Item(0) as XmlElement;
                                                        string chname = h2.InnerText;
                                                        
                                                        XmlNodeList uls = el.GetElementsByTagName("ul");
                                                        XmlElement ul;
                                                        if (uls.Count == 0)
                                                        {
                                                                ul = mDocument.CreateElement("ul");
                                                                el.AppendChild(ul);
                                                        }
                                                        else
                                                                ul = uls.Item(0) as XmlElement;

                                                        
                                                        ChannelSection sobj = new ChannelSection();
                                                        sobj.section = el;
                                                        sobj.heading = h2;
                                                        sobj.posts_list = ul;
                                                        mChannelsMap[chname] = sobj;
                                                }
                                        }
                                }
                        }
                }

                private void initLogFile()
                {
                        StreamWriter w = File.CreateText(mFileName);
                        
                        w.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
                        w.WriteLine("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">");
                        w.WriteLine("<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"ja\" xml:lang=\"ja\">");

                        w.WriteLine(" <head><link rel=\"stylesheet\" href=\"chatlog.css\" type=\"text/css\" /></head>");

                        w.WriteLine(" <body>");
                        w.WriteLine(" </body>");

                        w.WriteLine("</html>");

                        w.Close();
                }

                #region IDisposable

                public void Dispose()
                {
                        if (mDocument != null)
                                mDocument.Save(mFileName);
                }

                #endregion
        }

        struct ChannelSection
        {
                public XmlElement heading;
                public XmlElement section;
                public XmlElement posts_list;
        }
}