如何根据标签列表自动从文章生成标签？

+ - i - + i + - n - + in + - n - + inn +
  - A - + A +
  - t - + t + - o - + to +
              - e - + te + - n - + ten +
                           - a - + tea +
                           - d - + ted +

TrieNode root = rootOfTrie;
TrieNode current = root;

while (still typing)
{
   switch (key pressed)
   {
      case letter:

         if (current == null)
            break;

         bool found = false;

         foreach (successor trie edge)
         {
            if (edge.Letter == letter)
            {
               current = sucessor edge.node;
               found = true;
               break;
            }
         }

         if (!found)
            current = null;

         break;

      case whitespace:

         if (current != root && current != null && trie node is tag)
            suggest node current as tag;

         current = root;
         break;

      case backspace:

         // You may want to handle this case by back-tracking in the trie.

         current = null;
         break;

      default:

         current = null;
         break;
   }
}

foreach(string word in titleSplit)
{
    if (listOfTags.contains(word))
    {
        // You have matching word-tag.
        // Add it\'s text into your tags element, or to some collection
        // which will be processed later on.
        tags.add(word);
    }
}