import System.Data;
import System.Windows.Forms;

public class Parser {
	public static var ds : DataSet = new DataSet();

	public static function SetupDataSet() {
		var dt : DataTable = new DataTable("Content");
		dt.Columns.Add("Body");
		dt.Columns.Add("Date");
		dt.Columns.Add("Title");
		dt.Columns.Add("URL");
		ds.Tables.Add(dt);
	}
	
	public static function AddRow(sBody,sDate,sTitle,sURL) {
		if (ds.Tables.Count > 0) {
			var dr : DataRow = ds.Tables["Content"].NewRow();
			dr["Body"] = sBody;
			dr["Date"] = sDate;
			dr["Title"] = sTitle;
			dr["URL"] = sURL;
			ds.Tables["Content"].Rows.Add(dr);
		} else {
			MessageBox.Show("Table not initialized.", "JScript Error");
		}
	}
	
	public static function XMLtoDataSet(sData) {
		var xml = new ActiveXObject("MSXML2.DOMDocument.4.0");
		
		xml.validateOnParse = false;
		xml.async = false;
		xml.loadXML(sData);
		
		// use today's date because this feed has no <date>
		var d = new Date();
		var gd = d.getFullYear()+"-"+d.getMonth()+"-"+d.getDate();
		

		if (xml.parseError.errorCode != 0)
			System.Windows.Forms.MessageBox.Show("XML Parse Error : " + xml.parseError.reason);
		else
		{
			var oNodeList = xml.getElementsByTagName("item");
			
			for (var i = 0; i < oNodeList.length; i++) {
				var sBody = oNodeList.item(i).selectSingleNode("title").text;
				var sTitle = oNodeList.item(i).selectSingleNode("description").text;
				var sURL = oNodeList.item(i).selectSingleNode("link").text;
				
				var re = />([\w\d\s\S]+)</i; // match words, digits, space, and nonspace between 2 tags
				var p = null;
				if ((p = re.exec(sTitle)) != null) {
					AddRow(sBody, gd, p[1], sURL);	// p[1] is the 1st regex match
				} else {
					// uncomment the next line to see any ugly ones
					// AddRow(sBody, gd, sTitle, sURL);
				}
			}
		}
	}

	public static function Parse(sInput) : DataSet {
		SetupDataSet();		// Required, this is where the data goes.
		XMLtoDataSet(sInput);	// Function fills DataSet from sInput
		return(ds);		// Required.
	}
}