public CssRuleMatch Match(HtmlTag tag)
{
var result = new CssRuleMatch(this);
var selector = GetMatchingSelectors(tag).OrderByDescending(s => s.Specificity).FirstOrDefault();
result.Success = selector != null;
if (selector != null)
result.Specificity = selector.Specificity;
return result;
}
private static void AppendStyles(CssRule rule, HtmlTag tag)
{
var style = rule.Statements.ToSeparatedString("");
if (string.IsNullOrEmpty(style))
return;
var styles = new HtmlStyleCollection();
styles.Parse(style);
tag.Styles.Append(styles, true);
}
private static KeyValuePair<string, string>? GetKeyValue(HtmlTag meta)
{
var name = meta.Attributes["name"];
var equiv = meta.Attributes["http-equiv"];
string key;
if (!string.IsNullOrEmpty(name))
key = name;
else if (!string.IsNullOrEmpty(equiv))
key = equiv;
else
return null;
var value = meta.Attributes["content"] ?? string.Empty;
return new KeyValuePair<string, string>(key.ToLower(), value);
}
internal static void Parse(IHtmlElementCollection parent, Token token)
{
HtmlElement element = null;
if (token.Peeks("</"))
element = new HtmlEndTag(token);
else if (token.Peeks("<!DOCTYPE"))
element = new HtmlDocType(token);
else if (token.Peeks("<!--"))
element = new HtmlComment(token);
else if (token.Current == '<')
element = new HtmlTag(token);
else
element = new HtmlContent(token);
element.Parent = parent;
parent.ChildElements.Add(element);
if (element is HtmlTag)
{
var tag = (HtmlTag)element;
if (tag.IsType("script"))
{
HtmlContent script = new HtmlContent(token.ReadUntil("</script>"));
tag.ChildElements.Add(script);
}
}
if (element.ElementType != HtmlElementType.EndTag)
return;
var tagName = ((HtmlEndTag) element).TagName;
int startTagIdex = parent.ChildElements.Count - 2;
HtmlTag startTag = null;
while (startTagIdex >= 0)
{
var tmp = parent.ChildElements[startTagIdex] as HtmlTag;
if (tmp != null && !tmp.Closed && tmp.EndTag == null && tmp.Name.Equals(tagName, StringComparison.InvariantCultureIgnoreCase))
{
startTag = tmp;
break;
}
startTagIdex--;
}
if (startTag != null)
{
startTag.EndTag = (HtmlEndTag) element;
((HtmlEndTag) element).StartTag = startTag;
int rangeStart = startTagIdex + 1;
int rangeCount = parent.ChildElements.Count - startTagIdex - 2;
startTag.AssignChildElements(parent.ChildElements.GetRange(rangeStart, rangeCount));
parent.ChildElements.RemoveRange(rangeStart, rangeCount);
}
}
private IEnumerable<CssSelectorStack> GetMatchingSelectors(HtmlTag tag)
{
foreach (var stack in _selectorStacks)
{
if (stack.IsMatch(tag))
yield return stack;
//var tmp = tag;
//var selectorIndex = stack.Selectors.Count - 1;
//while (selectorIndex >= 0 && tmp != null)
//{
// if (stack.Selectors[selectorIndex].Matches(tmp))
// selectorIndex--;
// else if (selectorIndex == stack.Selectors.Count - 1)
// {
// break;
// }
// tmp = tmp.Parent as HtmlTag;
//}
//if (selectorIndex == -1)
//{
// yield return stack;
//}
}
}
private void Process(HtmlTag tag)
{
foreach (var match in _cssDocument.Rules.Select(r => r.Match(tag)).Where(m => m.Success).OrderBy(m => m.Specificity))
AppendStyles(match.Rule, tag);
foreach (var childTag in tag.ChildElements.Where(c => c.ElementType == HtmlElementType.Tag))
Process((HtmlTag) childTag);
}
