private void InterpretStyles(HtmlNode htmlNode)
{
string style;
if (!HtmlStyle.IsNonStyleElement(htmlNode.Tag))
{
if (htmlNode.Attributes.TryGetValue("style", out style))
{
CSSParser cssParser = new CSSParser();
htmlNode.AddStyles(cssParser.ParseRules(style, SelectorType.Inline));
}
Parse(htmlNode);
}
foreach (HtmlNode node in htmlNode.GetChildren())
{
InterpretStyles(node);
}
//This loop only needs when the parent is null. If parent is not null, it will loop through all the
//child elements thus next nodes processed without this loop.
if (htmlNode.Parent == null && htmlNode.Next != null)
{
InterpretStyles(htmlNode.GetNext());
}
}
internal bool Process(string selectorText, string styleText, List<MediaQuery> mediaQuries, ref int position)
{
CSSParser cssParser = new CSSParser();
List<CSSElement> elements = new List<CSSElement>();
Match match = mediaRegex.Match(selectorText);
if (string.IsNullOrEmpty(styleText))
{
return false;
}
if(!match.Success)
{
return false;
}
int closeBraceIndex = 0;
string style = CSSTokenizer.FindOpenCloseBraceArea(styleText, position + 1, out closeBraceIndex);
if (closeBraceIndex > position)
{
if (!string.IsNullOrEmpty(style))
{
cssParser.ParseCSS(style, elements, mediaQuries);
selectorText = selectorText.Substring(match.Length + 1);
mediaQuries.Add(new MediaQuery(selectorText, elements));
}
position = closeBraceIndex + 1;
}
return match.Success;
}
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);
}
}