protected override string CombineAssetContent(IList <IAsset> assets)
{
StringBuilderPool shared = StringBuilderPool.Shared;
StringBuilder stringBuilder = shared.Rent();
string empty = string.Empty;
List <string> stringList = new List <string>();
int count = assets.Count;
int num = count - 1;
for (int index = 0; index < count; ++index)
{
IAsset asset = assets[index];
if (this.EnableTracing)
{
stringBuilder.AppendFormatLine("/*#region URL: {0} */", (object)asset.Url);
}
stringBuilder.Append(StyleCombiner.EjectCssCharsetAndImports(asset.Content, ref empty, (IList <string>)stringList));
if (this.EnableTracing)
{
stringBuilder.AppendLine();
stringBuilder.AppendLine("/*#endregion*/");
}
if (index != num)
{
stringBuilder.AppendLine();
}
}
if (stringList.Count > 0)
{
string format = this.EnableTracing ? "/*#region CSS Imports */{0}{1}{0}/*#endregion*/{0}{0}" : "{1}{0}";
stringBuilder.Insert(0, string.Format(format, (object)Environment.NewLine, (object)string.Join(Environment.NewLine, (IEnumerable <string>)stringList)));
}
if (!string.IsNullOrWhiteSpace(empty))
{
stringBuilder.Insert(0, empty + Environment.NewLine);
}
string str = stringBuilder.ToString();
shared.Return(stringBuilder);
return(str);
}
/// <summary>
/// Eject a <code>@charset</code> and <code>@import</code> rules
/// </summary>
/// <param name="content">Text content of style asset</param>
/// <param name="topCharset">Processed top <code>@charset</code> rule</param>
/// <param name="imports">List of processed <code>@import</code> rules</param>
/// <returns>Text content of style asset without <code>@charset</code> and <code>@import</code> rules</returns>
private static string EjectCssCharsetAndImports(
string content,
ref string topCharset,
IList <string> imports)
{
int length = content.Length;
if (length == 0)
{
return(content);
}
MatchCollection matchCollection1 = CommonRegExps.CssCharsetRuleRegex.Matches(content);
MatchCollection matchCollection2 = StyleCombiner._cssImportRuleRegex.Matches(content);
if (matchCollection1.Count == 0 && matchCollection2.Count == 0)
{
return(content);
}
List <CssNodeMatch> source = new List <CssNodeMatch>();
foreach (Match match in matchCollection1)
{
CssNodeMatch cssNodeMatch = new CssNodeMatch(match.Index, match.Length, CssNodeType.CharsetRule, match);
source.Add(cssNodeMatch);
}
foreach (Match match in matchCollection2)
{
CssNodeMatch cssNodeMatch = new CssNodeMatch(match.Index, match.Length, CssNodeType.ImportRule, match);
source.Add(cssNodeMatch);
}
foreach (Match match in CommonRegExps.CssMultilineCommentRegex.Matches(content))
{
CssNodeMatch cssNodeMatch = new CssNodeMatch(match.Index, match.Length, CssNodeType.MultilineComment, match);
source.Add(cssNodeMatch);
}
List <CssNodeMatch> list = source.OrderBy <CssNodeMatch, int>((Func <CssNodeMatch, int>)(n => n.Position)).ThenByDescending <CssNodeMatch, int>((Func <CssNodeMatch, int>)(n => n.Length)).ToList <CssNodeMatch>();
StringBuilderPool shared = StringBuilderPool.Shared;
StringBuilder stringBuilder = shared.Rent();
int num = length - 1;
int currentPosition = 0;
foreach (CssNodeMatch cssNodeMatch in list)
{
CssNodeType nodeType = cssNodeMatch.NodeType;
int position = cssNodeMatch.Position;
Match match = cssNodeMatch.Match;
if (position >= currentPosition)
{
switch (nodeType)
{
case CssNodeType.CharsetRule:
case CssNodeType.ImportRule:
StyleCombiner.ProcessOtherContent(stringBuilder, content, ref currentPosition, position);
if (nodeType == CssNodeType.CharsetRule)
{
string str1 = match.Groups["charset"].Value;
string str2 = match.Value;
if (string.IsNullOrWhiteSpace(topCharset))
{
topCharset = string.Format("@charset \"{0}\";", (object)str1);
}
currentPosition += str2.Length;
continue;
}
if (nodeType == CssNodeType.ImportRule)
{
GroupCollection groups = match.Groups;
string str1 = groups["url"].Value;
string str2 = groups["media"].Success ? " " + groups["media"].Value : string.Empty;
string str3 = match.Value;
string str4 = string.Format("@import \"{0}\"{1};", (object)str1, (object)str2);
imports.Add(str4);
currentPosition += str3.Length;
continue;
}
continue;
case CssNodeType.MultilineComment:
int nextPosition = position + match.Length;
StyleCombiner.ProcessOtherContent(stringBuilder, content, ref currentPosition, nextPosition);
continue;
default:
continue;
}
}
}
if (currentPosition > 0 && currentPosition <= num)
{
StyleCombiner.ProcessOtherContent(stringBuilder, content, ref currentPosition, num + 1);
}
string str = stringBuilder.ToString();
shared.Return(stringBuilder);
return(str);
}
