/// <summary>Scans a CSS style sheet and returns a clean output removing invalid rules or properties.</summary>
/// <param name="styleSheet">The CSS style sheet to scan.</param>
/// <returns>A clean CSS style sheet as string.</returns>
private void ScanStyleSheet(ICssStyleSheet styleSheet)
{
var i = 0;
while (i < styleSheet.Rules.Length)
{
ICssRule rule = styleSheet.Rules[i];
if (!ScanStyleRule(rule))
{
AddError(Constants.ERROR_CSS_RULE_NOTALLOWED, rule.CssText);
styleSheet.RemoveAt(i); // Deletes rule in-place (length is dynamic), counter must not be incremented.
}
else
{
i++;
}
}
}
/// <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());
}