internal static string GetAttributeIdentifierValue(SourceLineNumberCollection sourceLineNumbers, XmlAttribute attribute, Action <MessageEventArgs> messageHandler)
{
if (null == attribute)
{
throw new ArgumentNullException("attribute");
}
string value = Common.GetAttributeValue(sourceLineNumbers, attribute, EmptyRule.CanBeWhitespaceOnly, messageHandler);
if (Common.IsIdentifier(value))
{
if (72 < value.Length && null != messageHandler)
{
messageHandler(WixWarnings.IdentifierTooLong(sourceLineNumbers, attribute.OwnerElement.Name, attribute.Name, value));
}
return(value);
}
else
{
if (value.StartsWith("[", StringComparison.Ordinal) && value.EndsWith("]", StringComparison.Ordinal) && null != messageHandler)
{
messageHandler(WixErrors.IllegalIdentifierLooksLikeFormatted(sourceLineNumbers, attribute.OwnerElement.Name, attribute.Name, value));
}
else if (null != messageHandler)
{
messageHandler(WixErrors.IllegalIdentifier(sourceLineNumbers, attribute.OwnerElement.Name, attribute.Name, value));
}
return(String.Empty);
}
}