Xapian devel - Mar 2013 - patch - add SnippetGenerator class

G'day,

This is some code which have been using for some time now in our
searching beta, forward ported from 1.2.12 to today's git.  It adds a
class Xapian::SnippetGenerator which can be used to generate
human-readable snippet strings.  By default, the snippets are HTML
formatted, with the matched search term inside a <b> tag, 5 words of
context around matched search terms, and ellipsis "..." between
non-adjacent context.

There is a certain amount of code duplication with the TermGenerator
class, which is ugly but I considered preferable to major surgery to
separate out the various parsing phases of TermGenerator so that some of
them could be re-used for SnippetGenerator.  Sorry.

Yes, I know there is a GSOC project to add snippets to Xapian.  That
code did not appear to be stable when I needed it, so I wrote my own. 
Perhaps it might be useful to someone.

-- 
Greg.
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On Wed, Mar 13, 2013 at 04:56:44PM +1100, Greg Banks
wrote:
> This is some code which have been using for some time now in our
> searching beta, forward ported from 1.2.12 to today's git.
Thanks for the patch.  It doesn't look like it is against trunk though
(e.g. xapian/base.h is no longer present in trunk) - did you attach the
1.2 version perhaps?
> Yes, I know there is a GSOC project to add snippets to Xapian.  That
> code did not appear to be stable when I needed it, so I wrote my own. 
> Perhaps it might be useful to someone.
I think I'd rather focus on merging Mihai's work at this point, but as
you say someone may have a use for this.

Cheers,
    Olly