public static string MoveCssInline(string htmlInput, bool removeStyleElements, Uri basePath)
{
using (var reader = new System.IO.StringReader(htmlInput))
{
var web = new System.Net.WebClient();
var sgmlReader = new Pipes.Sgml.SgmlReader();
sgmlReader.DocType = "HTML";
sgmlReader.WhitespaceHandling = WhitespaceHandling.All;
sgmlReader.CaseFolding = CaseFolding.ToLower;
sgmlReader.InputStream = reader;
sgmlReader.SimulatedNode = "html";
sgmlReader.StripDocType = false;
var doc = new XmlDocument();
doc.Load(sgmlReader);
var root = doc.DocumentElement;
if (root.ChildNodes.OfType<XmlElement>().Count() == 1) root = root.ChildNodes.OfType<XmlElement>().Single();
var parser = new Parser();
var engine = new HtmlQueryEngine();
var visitor = new MatchVisitor(engine) { Comparison = StringComparison.OrdinalIgnoreCase };
var css = new StringBuilder();
var nodes = doc.SelectNodes("//style").OfType<System.Xml.XmlNode>().ToList();
foreach (var node in nodes)
{
css.AppendLine(node.InnerText);
if (removeStyleElements) node.ParentNode.RemoveChild(node);
}
nodes = doc.SelectNodes("//link[@rel='stylesheet' and @href]").OfType<System.Xml.XmlNode>().ToList();
foreach (var node in nodes)
{
css.Append("@import url('").Append(node.Attributes["href"].Value).Append("')");
if (node.Attributes["media"] != null && !string.IsNullOrEmpty(node.Attributes["media"].Value))
{
css.Append(" ").Append(node.Attributes["media"].Value);
}
css.AppendLine(";");
if (removeStyleElements) node.ParentNode.RemoveChild(node);
}
var stylesheet = parser.Parse(css.ToString());
var elements = root.SelectNodes("//*").OfType<XmlElement>().Select(e => new Pipes.Xml.XmlElementWrapper(e)).ToList();
var settings = new GlobalStyleContext();
settings.ResourceLoader = p => {
var href = (basePath == null ? new Uri(p) : new Uri(basePath, p));
return DownloadStream(href);
};
var rules = stylesheet.Rules.GetStyleRules(settings).ToList();
IEnumerable<StyleRule> elemRules;
string inlineStyle;
IEnumerable<Property> props;
foreach (var elem in elements)
{
inlineStyle = elem.Attribute<string>("style", null);
elemRules = rules;
if (!string.IsNullOrEmpty(inlineStyle))
{
elemRules = elemRules.Concat(Enumerable.Repeat(Utils.ParseInline(inlineStyle), 1));
}
props = elemRules.ApplicableProperties(elem, engine, StringComparison.OrdinalIgnoreCase, settings);
if (props.Any())
{
inlineStyle = props.Select(p => p.ToString()).Aggregate((p, c) => p + ";" + c);
elem.Attribute("style", inlineStyle);
}
}
return doc.OuterXml;
}
}
public static IEnumerable<StyleRule> GetStyleRules(this IEnumerable<RuleSet> rules, GlobalStyleContext settings)
{
StyleRule style;
MediaRule media;
while (rules.Any())
{
var loader = new ImportLoader(rules.OfType<ImportRule>()
.Where(i => !i.Media.Any() || i.Media.Any(m => MediaMatches(m, settings)))
.ToList(),
settings.ResourceLoader);
loader.Start();
foreach (var rule in rules)
{
style = rule as StyleRule;
media = rule as MediaRule;
if (style != null)
{
yield return style;
}
else if (media != null)
{
if (media.Media.Any(m => MediaMatches(m, settings)))
{
foreach (var s in media.RuleSets.GetStyleRules(settings))
{
yield return s;
}
}
}
}
loader.WaitAll();
if (loader.Sheets.Any())
{
rules = loader.Sheets.SelectMany(s => s.Rules);
}
else
{
rules = Enumerable.Empty<RuleSet>();
}
}
}
private static bool MediaMatches(MediaDefinition d, GlobalStyleContext settings)
{
var context = new StyleContext();
var result = (d.Modifier != MediaTypeModifier.Not && (d.Type & settings.Media) > 0) ||
(d.Modifier == MediaTypeModifier.Not && (d.Type & settings.Media) == 0);
if (result)
{
var width = d.Properties.Where(p => string.Compare(p.Name, "width", StringComparison.OrdinalIgnoreCase) == 0 ||
p.Name.EndsWith("-width", StringComparison.OrdinalIgnoreCase));
var plainProps = width.OfType<MediaPropertyPlain>();
double px;
foreach (var plain in plainProps)
{
px = ToPx(plain.Value as PrimitiveTerm, context, false);
if (plain.Name.StartsWith("max-", StringComparison.OrdinalIgnoreCase) && px > settings.MediaWidth) return false;
if (plain.Name.StartsWith("min-", StringComparison.OrdinalIgnoreCase) && px < settings.MediaWidth) return false;
}
var rangeProps = width.OfType<MediaPropertyRange>();
foreach (var range in rangeProps)
{
if (range.LowerBound != null)
{
px = ToPx(range.LowerBound as PrimitiveTerm, context, false);
if (settings.MediaWidth < px || (settings.MediaWidth == px && !range.LowerCompare.EndsWith("="))) return false;
}
if (range.UpperBound != null)
{
px = ToPx(range.UpperBound as PrimitiveTerm, context, false);
if (settings.MediaWidth > px || (settings.MediaWidth == px && !range.UpperCompare.EndsWith("="))) return false;
}
}
}
return result;
}
public static IEnumerable<Property> ApplicableProperties(this IEnumerable<StyleRule> rules, IQueryableNode node, IQueryEngine engine, StringComparison comparison, GlobalStyleContext settings)
{
var visitor = new MatchVisitor(engine);
visitor.Comparison = comparison;
var terms = new Dictionary<string, TermSpecificity>();
TermSpecificity existing;
int specificity = 0;
int propSpecificity;
foreach (var style in rules)
{
if (style.Selector != null)
{
visitor.Initialize(node);
style.Selector.Visit(visitor);
}
if (style.Selector == null || visitor.IsMatch())
{
specificity = style.Selector == null ? 0 : (visitor.MatchSpecificity > 0 ? visitor.MatchSpecificity : style.Selector.GetSpecificity());
foreach (var prop in style.Declarations.SelectMany(p => p.Expand(settings.LeftToRight)))
{
propSpecificity = specificity + (prop.Important ? (1 << 20) : 0);
if (terms.TryGetValue(prop.Name, out existing))
{
if (propSpecificity >= existing.Specificity)
{
existing.Property = prop;
}
}
else
{
terms[prop.Name] = new TermSpecificity() { Property = prop, Specificity = propSpecificity };
}
}
}
}
return terms.Values.Select(v => v.Property);
}
