public HTMLTag FindCorrespondingEndTag(HTMLTag tag, HTMLTag stopBeforeTag)
{
if (tag == null)
{
return(null);
}
if (tag.IsEnd)
{
throw new ArgumentException("Tag must be a start tag.");
}
if (tag.IsSelfClosing)
{
return(tag);
}
int startIndex = GetTagIndex(tag) + 1;
int stopIndex = stopBeforeTag != null ? (GetTagIndex(stopBeforeTag) - 1) : (_tags.Count - 1);
int depth = 1;
for (int i = startIndex; i <= stopIndex; i++)
{
HTMLTag tag2 = _tags[i];
if (!tag2.IsSelfClosing && tag2.NameEquals(tag.Name))
{
depth += tag2.IsEnd ? -1 : 1;
if (depth == 0)
{
return(tag2);
}
}
}
return(null);
}
private static string DetectCharacterSetFromContent(byte[] bytes, string httpContentType)
{
string text = UnknownEncodingToString(bytes, 4096);
HTMLParser htmlParser = new HTMLParser(text);
string mimeType = GetMIMETypeFromContentType(httpContentType) ?? String.Empty;
string charSet;
if (mimeType.Equals("application/xhtml+xml", StringComparison.OrdinalIgnoreCase) ||
mimeType.Equals("application/xml", StringComparison.OrdinalIgnoreCase) ||
mimeType.Equals("text/xml", StringComparison.OrdinalIgnoreCase))
{
if (text.StartsWith("<?xml", StringComparison.OrdinalIgnoreCase))
{
// XML declaration
HTMLParser xmlParser = new HTMLParser("<" + text.Substring(2));
HTMLTag xmlTag = xmlParser.Tags.Count >= 1 ? xmlParser.Tags[0] : null;
if (xmlTag != null && xmlTag.NameEquals("xml") && xmlTag.Offset == 0)
{
charSet = xmlTag.GetAttributeValue("encoding");
if (!String.IsNullOrEmpty(charSet))
{
return(charSet);
}
}
}
// Default
return("UTF-8");
}
foreach (HTMLTag tag in htmlParser.FindStartTags("meta"))
{
// charset attribute
charSet = tag.GetAttributeValue("charset");
if (!String.IsNullOrEmpty(charSet))
{
return(charSet);
}
// http-equiv and content attributes
if (tag.GetAttributeValueOrEmpty("http-equiv").Trim().Equals("Content-Type", StringComparison.OrdinalIgnoreCase))
{
charSet = GetCharSetFromContentType(tag.GetAttributeValue("content"));
if (!String.IsNullOrEmpty(charSet))
{
return(charSet);
}
}
}
return(null);
}
