[Xapian-discuss] Get term from document by position

[john.alveris at Safe-mail.net]

Hello. Is there any FAST way to get a term from  the xapian document by it's position, something like 
std::string term = Xapian::Document::GetTermByPosition(int position) ?

Below i have described a task that i am trying to solve, in case if somebody is interested.




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When displaying search results, i would like to to display a piece of the document that is related to the search string (snippet). I have the following idea:

1) first i have to find the positions of the search terms by using
Xapian::TermIterator::positionlist_begin() iterator.

2) second, i have to display terms that have positions that are close to the search term position (several terms from the left, and several terms from the right of the search term)

So, i know positions of the terms that i want to display. But how to get the terms itself? Xapian::Document does not have something like GetTermByPosition(int position).

Currently i am iterating through all of the terms, than through all of the positions, something like this:

 for (term = xapian_database.termlist_begin(docid);
        term != xapian_database.termlist_end(docid); term++)
    {
           
    for (pos = xapian_database.positionlist_begin(docid, *term);
            pos != xapian_database.positionlist_end(docid, *term); pos++)
        {
        if ( (*pos) == position_of_my_term)) my_term= *term;

        }
    }

This does what i want, but this cycle takes too long to run. So, may there is a better approach?