using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using System.Xml;
using System.Windows.Data;

namespace RssReader {
    /// <summary>
    /// removeHTMLTags provides a one-way conversion from HTML to a string that doesn't contain HTML-Tag.
    /// </summary>
    
    public class removeHTMLTags : IValueConverter {
        public object Convert ( object value, Type targetType, object parameter, System.Globalization.CultureInfo culture ) {
            String _str = "";
            if ( value != null ) {
                XmlElement xml = ( XmlElement )value;
                XmlNode node = xml.FirstChild;
                _str = node.Value;

                // JavaScript
                Regex re1 = new Regex ( "<(no)?script.*?script>",
                RegexOptions.IgnoreCase | RegexOptions.Singleline );

                // HTML Tags
                Regex re2 = new Regex ( "<.*?>", RegexOptions.Singleline );

                // code
                Regex re3 = new Regex ( "\n+", RegexOptions.Singleline );

                // Replace
                _str = re1.Replace ( _str, "" );
                _str = re2.Replace ( _str, "" );
                _str = re3.Replace ( _str, "\n" );
            }
            return _str;
        }

        public object ConvertBack ( object value, Type targetType, object parameter, System.Globalization.CultureInfo culture ) {
            return null;
        }
    }
}