/// <summary>Gets the string representation of a CSS style sheet.</summary>
/// <param name="styleSheet">The CSS style sheet to stringify.</param>
/// <param name="isMainStyleSheet">If the style sheet is the one scanned,
/// use <c>false</c> if it is an imported style sheet.</param>
/// <returns>A CSS style sheet as string.</returns>
private string StringifyStyleSheet(ICssStyleSheet styleSheet, bool isMainStyleSheet = true)
{
var stringWriter = new StringWriter();
styleSheet.ToCss(stringWriter, new CssStyleFormatter());
string result = stringWriter.GetStringBuilder().ToString();
if (policy.EmbedsStyleSheets && isMainStyleSheet)
{
foreach (KeyValuePair <string, ICssStyleSheet> imported in ScannedImportedStyleSheets)
{
result = result.Replace(imported.Key, StringifyStyleSheet(imported.Value, isMainStyleSheet: false));
}
}
return(result);
}
/// <summary>
/// 过滤规则
/// </summary>
/// <param name="cssStyleSheet"></param>
/// <returns></returns>
protected virtual string Filters(ICssStyleSheet cssStyleSheet)
{
if (cssStyleSheet == null || cssStyleSheet.Rules.Length == 0)
{
return(string.Empty);
}
for (var i = 0; i < cssStyleSheet.Rules.Length;)
{
ICssRule rule = cssStyleSheet.Rules[i];
if (!Validate(rule))
{
cssStyleSheet.RemoveAt(i);
}
else
{
i++;
}
}
return(cssStyleSheet.ToCss());
}