private string PreprocessScript(string input, string tag_name)
        {
            StringBuilder stringBuilder = new StringBuilder();
            int           i             = 0;
            int           length        = tag_name.Length;

            while (i < input.Length)
            {
                bool flag = false;
                if (i + length + 1 < input.Length && input.Substring(i, length + 1).ToLower().Equals("<" + tag_name))
                {
                    while (i < input.Length)
                    {
                        if (input.Substring(i, 1).Equals(">"))
                        {
                            stringBuilder.Append(">");
                            i++;
                        }
                        else
                        {
                            if (i + 1 >= input.Length || !input.Substring(i, 2).Equals("/>"))
                            {
                                if (input.Substring(i, 1).Equals("\""))
                                {
                                    stringBuilder.Append("\"");
                                    i++;
                                    while (i < input.Length && !input.Substring(i, 1).Equals("\""))
                                    {
                                        stringBuilder.Append(input.Substring(i, 1));
                                        i++;
                                    }
                                    if (i < input.Length)
                                    {
                                        i++;
                                        stringBuilder.Append("\"");
                                    }
                                }
                                else if (input.Substring(i, 1).Equals("'"))
                                {
                                    stringBuilder.Append("'");
                                    i++;
                                    while (i < input.Length && !input.Substring(i, 1).Equals("'"))
                                    {
                                        stringBuilder.Append(input.Substring(i, 1));
                                        i++;
                                    }
                                    if (i < input.Length)
                                    {
                                        i++;
                                        stringBuilder.Append("'");
                                    }
                                }
                                else
                                {
                                    stringBuilder.Append(input.Substring(i, 1));
                                    i++;
                                }
                                continue;
                            }
                            stringBuilder.Append("/>");
                            i   += 2;
                            flag = true;
                        }
                        break;
                    }
                    if (i >= input.Length)
                    {
                        goto IL_314;
                    }
                    if (!flag)
                    {
                        StringBuilder stringBuilder2 = new StringBuilder();
                        while (i + length + 3 < input.Length && !input.Substring(i, length + 3).ToLower().Equals("</" + tag_name + ">"))
                        {
                            stringBuilder2.Append(input.Substring(i, 1));
                            i++;
                        }
                        stringBuilder.Append(HtmlParser.EncodeScript(stringBuilder2.ToString()));
                        stringBuilder.Append("</" + tag_name + ">");
                        if (i + length + 3 < input.Length)
                        {
                            i += length + 3;
                        }
                    }
                    goto IL_301;
                }
                stringBuilder.Append(input.Substring(i, 1));
                i++;
                IL_301 :;
            }
            IL_314 :
            return(stringBuilder.ToString());
        }
        public HtmlNodeCollection Parse(string html)
        {
            HtmlNodeCollection htmlNodeCollection = new HtmlNodeCollection(null);

            html = this.PreprocessScript(html, "script");
            html = this.PreprocessScript(html, "style");
            html = this.RemoveComments(html);
            html = this.RemoveSGMLComments(html);
            StringCollection tokens        = this.GetTokens(html);
            int                i           = 0;
            HtmlElement        htmlElement = null;
            HtmlNodeCollection result;

            while (i < tokens.Count)
            {
                if ("<".Equals(tokens[i]))
                {
                    i++;
                    if (i >= tokens.Count)
                    {
                        result = htmlNodeCollection;
                        return(result);
                    }
                    string name = tokens[i];
                    i++;
                    htmlElement = new HtmlElement(name);
                    while (i < tokens.Count && !">".Equals(tokens[i]) && !"/>".Equals(tokens[i]))
                    {
                        string name2 = tokens[i];
                        i++;
                        if (i < tokens.Count && "=".Equals(tokens[i]))
                        {
                            i++;
                            string value;
                            if (i < tokens.Count)
                            {
                                value = tokens[i];
                            }
                            else
                            {
                                value = null;
                            }
                            i++;
                            HtmlAttribute attribute = new HtmlAttribute(name2, HtmlEncoder.DecodeValue(value));
                            htmlElement.Attributes.Add(attribute);
                        }
                        else if (i < tokens.Count)
                        {
                            HtmlAttribute attribute = new HtmlAttribute(name2, null);
                            htmlElement.Attributes.Add(attribute);
                        }
                    }
                    htmlNodeCollection.Add(htmlElement);
                    if (i < tokens.Count && "/>".Equals(tokens[i]))
                    {
                        htmlElement.IsTerminated = true;
                        i++;
                        htmlElement = null;
                    }
                    else if (i < tokens.Count && ">".Equals(tokens[i]))
                    {
                        i++;
                    }
                }
                else if (">".Equals(tokens[i]))
                {
                    i++;
                }
                else if ("</".Equals(tokens[i]))
                {
                    i++;
                    if (i >= tokens.Count)
                    {
                        result = htmlNodeCollection;
                        return(result);
                    }
                    string name = tokens[i];
                    i++;
                    int num = this.FindTagOpenNodeIndex(htmlNodeCollection, name);
                    if (num != -1)
                    {
                        this.MoveNodesDown(ref htmlNodeCollection, num + 1, (HtmlElement)htmlNodeCollection[num]);
                    }
                    while (i < tokens.Count && !">".Equals(tokens[i]))
                    {
                        i++;
                    }
                    if (i < tokens.Count && ">".Equals(tokens[i]))
                    {
                        i++;
                    }
                    htmlElement = null;
                }
                else
                {
                    string text = tokens[i];
                    if (this.mRemoveEmptyElementText)
                    {
                        text = this.RemoveWhitespace(text);
                    }
                    text = HtmlParser.DecodeScript(text);
                    if (!this.mRemoveEmptyElementText || text.Length != 0)
                    {
                        if (htmlElement == null || !htmlElement.NoEscaping)
                        {
                            text = HtmlEncoder.DecodeValue(text);
                        }
                        HtmlText node = new HtmlText(text);
                        htmlNodeCollection.Add(node);
                    }
                    i++;
                }
            }
            result = htmlNodeCollection;
            return(result);
        }