/// <summary>
/// Creates a new option describing how to present a certain tag depending on html attributes.
/// </summary>
/// <param name="openBBCodeTag">The open bbcode tag. No []</param>
/// <param name="closeBBCodeTag">The close bbcode tag. No [], but something like /b</param>
/// <param name="contentHtmlAttribute">The html attribute that gets the content.</param>
/// <param name="optionHtmlAttribute">The html attribute that gets the option.</param>
public HtmlOption(string openBBCodeTag, string closeBBCodeTag, HtmlAttribute contentHtmlAttribute, HtmlAttribute optionHtmlAttribute)
: base(openBBCodeTag, closeBBCodeTag)
{
//we can have bbcode without closing tags, though...
//there is no need in attribute validations. See the commented IsAttributesValid function and see why.
ContentHtmlAttribute = contentHtmlAttribute;
OptionHtmlAttribute = optionHtmlAttribute;
}
/// <summary>
/// Returns the value of the given attribute in the given tag representation
/// </summary>
/// <param name="tagRepresentation">The tag representation.</param>
/// <param name="attribute">The attribute which value we need.</param>
public static string GetAttributeValue(string tagRepresentation, HtmlAttribute attribute)
{
if (string.IsNullOrEmpty(tagRepresentation)) throw new ArgumentNullException("tagRepresentation");
if (attribute == null) throw new ArgumentNullException("attribute");
//there can be a problem if the attribute name contains some regex symbols.
Match attr = Regex.Match(tagRepresentation, attribute.Name + "=\"[^\"]*\"");
if (!attr.Success) return null; //don't have such attribute.
if (!attribute.HasValue) return attr.Value.Substring(attr.Value.IndexOf('=') + 1).Trim('"');//if we want to get a whole value attribute - return only the value without the quotation marks...
string attributeNameWithSeparator = attribute.Value.Name + AttributeOption.ValueSeparator;
if (!attr.Value.Contains(attributeNameWithSeparator)) return null;
string attrVal = attr.Value.Substring(attr.Value.IndexOf(attributeNameWithSeparator) + attributeNameWithSeparator.Length).Trim(); //get everything after the name
if (!attrVal.Contains(attribute.Value.OptionDelimiter)) return attrVal; //if there is no delimiter, return everything else.
return attrVal.Substring(0, attrVal.IndexOf(attribute.Value.OptionDelimiter)).Trim();
}