private void TraverseHtmlNodes(HtmlNode node, StyleSheet styleSheet)
{
string style = string.Empty;
if (string.Compare(node.Tag, HtmlTag.STYLE, StringComparison.InvariantCultureIgnoreCase) == 0)
{
style = node.InnerHtml == null ? string.Empty : node.InnerHtml.Trim();
}
else if (string.Compare(node.Tag, HtmlTag.LINK, StringComparison.InvariantCultureIgnoreCase) == 0)
{
string relValue = node.ExtractAttributeValue("rel");
string media = node.ExtractAttributeValue("media");
if (string.Compare(rel, relValue, StringComparison.InvariantCultureIgnoreCase) == 0 &&
(string.IsNullOrEmpty(media) || media.CompareInvariantCultureIgnoreCase("screen")
|| media.CompareInvariantCultureIgnoreCase("all")))
{
string url = node.ExtractAttributeValue("href");
if (!string.IsNullOrEmpty(url))
{
WebManager web = new WebManager(uriSchema, baseUrl);
style = web.ExtractStylesFromLink(url);
}
}
}
if (!string.IsNullOrEmpty(style))
{
List<CSSElement> styles = new List<CSSElement>();
List<MediaQuery> mediaQueries = new List<MediaQuery>();
CSSParser parser = new CSSParser();
parser.ParseCSS(style, styles, mediaQueries);
styleSheet.AddRange(styles);
styleSheet.AddMediaQueryRange(mediaQueries);
}
foreach (HtmlNode n in node.GetChildren())
{
TraverseHtmlNodes(n, styleSheet);
}
}
internal StyleSheet TrackCSS(HtmlNode node)
{
StyleSheet styleSheet = new StyleSheet(new SelectorContext());
TraverseHtmlNodes(node, styleSheet);
HtmlNode nextNode = node.GetNext();
while (nextNode != null)
{
TraverseHtmlNodes(nextNode, styleSheet);
nextNode = nextNode.GetNext();
}
return styleSheet;
}