WpfRichText.Ex.XamlToHtmlParser.CssStylesheet.DiscoverStyleDefinitions C# (CSharp) Method

        public void DiscoverStyleDefinitions(XmlElement htmlElement)
        {
            if (htmlElement.LocalName.ToLower() == "link")
            {
                return;
                //  Add LINK elements processing for included stylesheets
                // <LINK href="http://sc.msn.com/global/css/ptnr/orange.css" type=text/css \r\nrel=stylesheet>
            }

            if (htmlElement.LocalName.ToLower() != "style")
            {
                // This is not a STYLE element. Recurse into it
                for (XmlNode htmlChildNode = htmlElement.FirstChild; htmlChildNode != null; htmlChildNode = htmlChildNode.NextSibling)
                {
                    if (htmlChildNode is XmlElement)
                    {
                        this.DiscoverStyleDefinitions((XmlElement)htmlChildNode);
                    }
                }
                return;
            }

            // Add style definitions from this style.

            // Collect all text from this style definition
            StringBuilder stylesheetBuffer = new StringBuilder();

            for (XmlNode htmlChildNode = htmlElement.FirstChild; htmlChildNode != null; htmlChildNode = htmlChildNode.NextSibling)
            {
                if (htmlChildNode is XmlText || htmlChildNode is XmlComment)
                {
                    stylesheetBuffer.Append(RemoveComments(htmlChildNode.Value));
                }
            }

            // CssStylesheet has the following syntactical structure:
            //     @import declaration;
            //     selector { definition }
            // where "selector" is one of: ".classname", "tagname"
            // It can contain comments in the following form: /*...*/

            int nextCharacterIndex = 0;
            while (nextCharacterIndex < stylesheetBuffer.Length)
            {
                // Extract selector
                int selectorStart = nextCharacterIndex;
                while (nextCharacterIndex < stylesheetBuffer.Length && stylesheetBuffer[nextCharacterIndex] != '{')
                {
                    // Skip declaration directive starting from @
                    if (stylesheetBuffer[nextCharacterIndex] == '@')
                    {
                        while (nextCharacterIndex < stylesheetBuffer.Length && stylesheetBuffer[nextCharacterIndex] != ';')
                        {
                            nextCharacterIndex++;
                        }
                        selectorStart = nextCharacterIndex + 1;
                    }
                    nextCharacterIndex++;
                }

                if (nextCharacterIndex < stylesheetBuffer.Length)
                {
                    // Extract definition
                    int definitionStart = nextCharacterIndex;
                    while (nextCharacterIndex < stylesheetBuffer.Length && stylesheetBuffer[nextCharacterIndex] != '}')
                    {
                        nextCharacterIndex++;
                    }

                    // Define a style
                    if (nextCharacterIndex - definitionStart > 2)
                    {
                        this.AddStyleDefinition(
                            stylesheetBuffer.ToString(selectorStart, definitionStart - selectorStart),
                            stylesheetBuffer.ToString(definitionStart + 1, nextCharacterIndex - definitionStart - 2));
                    }

                    // Skip closing brace
                    if (nextCharacterIndex < stylesheetBuffer.Length)
                    {
                        Debug.Assert(stylesheetBuffer[nextCharacterIndex] == '}');
                        nextCharacterIndex++;
                    }
                }
            }
        }